US20060102246A1 - Liquid dispenser with sealing module - Google Patents
Liquid dispenser with sealing module Download PDFInfo
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- US20060102246A1 US20060102246A1 US10/991,797 US99179704A US2006102246A1 US 20060102246 A1 US20060102246 A1 US 20060102246A1 US 99179704 A US99179704 A US 99179704A US 2006102246 A1 US2006102246 A1 US 2006102246A1
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- United States
- Prior art keywords
- seal
- stem
- module
- housing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
- B67D7/42—Filling nozzles
- B67D7/44—Filling nozzles automatically closing
- B67D7/46—Filling nozzles automatically closing when liquid in container to be filled reaches a predetermined level
- B67D7/48—Filling nozzles automatically closing when liquid in container to be filled reaches a predetermined level by making use of air suction through an opening closed by the rising liquid
Definitions
- This invention relates generally to liquid dispensing devices, and more particularly to seal assemblies for liquid dispensing devices.
- Fluid dispensers include a variety of components for selectively controlling the flow of and dispensing a fluid.
- Fuel dispensing systems can include, for example, a stem for assisting in actuating a poppet valve between opened and closed positions to control fluid flow between an inlet and outlet port.
- a fluid dispensing system is described in U.S. Pat. No. 3,811,486 (the '486 Patent) to Wood, the entire disclosure of which is hereby incorporated herein by reference.
- Fluid dispensing assemblies or nozzles can comprise a main body with an inlet port adapted to communicate with a source of pressurized fluid, and an outlet port adapted to dispense fluid from the main body.
- a stem for actuating a valve, slides relative to a seal or to a packing (typically loose material stuffed around the stem in a chamber).
- the stem together with a lever, can assist in actuating the valve, such as a poppet valve, to control fluid dispensing.
- the packing, an O-ring or a related flanged lip seal has been provided to prevent leakage of fluid along the stem, and more particularly between the stem and portions of the main body.
- a flanged lip seal with an internal O-ring energizer has been utilized.
- seals and sealing systems have exhibited problems with respect to sealing performance and/or durability.
- such seals may exhibit rapid deterioration and wear from movement within the dispenser. Accordingly, the seal can become quickly compromised, resulting in leakage of the fluid.
- seals typically have an inner surface which seals against the moving stem, or other component, and an outer surface which seals against the stationary dispenser body. Friction from movement of the seal caused by movement of the stem can compromise the sealing surface against the stem as well as the sealing surface against the stationary body.
- a fluid dispenser comprising a fluid dispenser housing having an inner chamber defined by a chamber surface, and a cylindrical stem that includes an outer surface.
- the stem is configured to control the flow of fluid through said housing.
- the dispenser also includes an insertable module which is selectively engaged with said inner chamber and includes an opening slidingly receiving said stem.
- a stem seal member is retained by said module and is in sealing contact with the outer surface of the cylindrical stem when the module is engaged with the inner chamber to provide a first seal.
- the stem seal member is separated from the housing by a portion of the module and the said stem seal member contacts the stem and a substantially non-porous portion of said module.
- the assembly also includes a housing seal member retained by the module and in sealing contact with the chamber surface of the housing when the module is engaged with the inner chamber to provide a second seal.
- the housing seal member is separated from the stem by a portion of the module whereby the second seal provides a static seal against the chamber surface.
- the module is configured to retain the stem seal member and the housing seal member when the module is disengaged from the chamber.
- a fluid dispensing assembly comprising a main body including an inlet port adapted to communicate with a source of pressurized fluid and an outlet port adapted to dispense fluid from said main body, the main body including an inner chamber defined by a chamber surface.
- the assembly also includes a stem having an outer surface, wherein the stem is adapted to assist in regulating fluid between said inlet port and said outlet port of said main body.
- the assembly includes a stem seal having an opening slidably receiving the stem and comprising an inner sealing surface, wherein the inner sealing surface sealingly contacts the outer surface of the stem to provide a first seal.
- the assembly includes a body seal sealingly contacting the chamber surface of the body to provide a second seal, and a module configured to selectively engage the inner chamber and including an opening for receiving the stem.
- the module is adapted to retain the stem seal and the body seal when the module is disengaged from the chamber.
- the stem seal provides the first seal against the stem when the module engages the inner chamber and the body seal provides the second seal against the chamber surface when the module engages the inner chamber.
- the assembly further includes a manual actuator adapted to control movement of the stem and control the flow of fluid through the main body.
- a fluid dispenser comprising a main body including an inlet port adapted to communicate with a source of pressurized fuel and an outlet port adapted to dispense fuel from said main body, wherein said main body includes an inner chamber defined by a chamber surface.
- the dispenser also includes a seal having a sealing surface, wherein the sealing surface sealingly contacts a component of the fuel dispensing assembly to provide a first seal.
- the dispenser also comprises an insertable retainer configured to selectively engage the inner chamber, wherein the retainer is adapted to retain the seal when the retainer is disengaged from said chamber, and wherein the seal provides the first seal against the assembly component when the retainer engages the inner chamber.
- the dispenser also includes a manual actuator adapted to control the flow of fuel through the main body, and a shut-off actuator configured to automatically shut off flow of fuel through the main body in response to a fill condition.
- a method for assembling a fuel dispensing apparatus comprising placing a seal on a module such that the seal is held on said module, and providing components for assembling a fuel dispensing apparatus.
- the method also comprises engaging the module with a housing for a fuel dispensing apparatus, such that the seal contacts at least one of the housing and the components and provides a fluid-tight seal therewith.
- the method further comprises assembling the components and the housing as a fuel dispensing apparatus.
- a fluid dispenser comprising a fluid dispenser housing having an inner chamber defined by a chamber surface, and a poppet stem assembly residing within the inner chamber.
- the poppet stem assembly comprises a cylindrical stem including an outer surface, the stem being configured to control the flow of fluid through the housing.
- the assembly also includes a stem seal member in sealing contact with the outer surface of said cylindrical stem to provide a first seal, wherein the stem seal member does not contact said housing.
- the assembly includes a housing seal member in sealing contact with the chamber surface of the housing to provide a second seal, wherein the housing seal member does not contact the stem.
- FIG. 1 is a partial sectional view of an illustrative embodiment of a fluid dispensing assembly, made and operating in accordance with principles of the present invention
- FIG. 2 a is a cross sectional view of an illustrative embodiment of a poppet stem seal module, made and operating according to principles of the present invention
- FIG. 2 b is a perspective view of the module of FIG. 2 a;
- FIG. 3 a is a cross sectional view of an illustrative embodiment of a seal that can be used in the stem seal module of FIGS. 1 and 2 , in accordance with principles of the present invention
- FIG. 3 b is a top view of the seal of FIG. 3 a;
- FIG. 4 a is a perspective view of an illustrative embodiment of the cantilever spring of the seal of FIGS. 3 a and 3 b;
- FIG. 4 b is a perspective view of the seal of FIGS. 3 a and 3 b;
- FIG. 5 is a partial sectional view of another illustrative embodiment of a fluid dispensing assembly, made and operating in accordance with principles of the present invention
- FIG. 6 is a cross sectional view of an illustrative embodiment of a fueling nozzle which includes the insertable poppet stem seal module of FIG. 2 , and which is made and operating according to principles of the present invention.
- FIG. 7 is a cross sectional view of an illustrative embodiment of a fueling nozzle which includes the insertable poppet stem seal module of FIG. 5 , and which is made and operating according to principles of the present invention.
- FIG. 1 depicts a fluid dispensing assembly 10 , made and operating in accordance with principles of the present invention.
- the fluid dispensing assembly 10 includes a main body 12 with an inlet port 14 adapted to communicate with a source of pressurized fluid.
- a high pressure fuel hose can be removably connected to the inlet port 14 to allow a fuel pump (not shown) such as in a gasoline station to act as a source of pressurized fuel for the fuel nozzle 10 .
- the fluid dispensing assembly 10 further includes an outlet port 16 adapted to dispense fluid from the main body 12 .
- the outlet port 16 can take the form of a familiar spout or other device adapted to communicate with the inlet opening of a vehicle fuel tank.
- the fluid dispensing assembly 10 may include a sliding stem seal assembly 18 , wherein a stem 20 may axially reciprocate relative to a stem seal member 50 as discussed more fully below.
- the stem 20 is adapted to assist in regulating fluid between the inlet port 14 and the outlet port 16 .
- the stem 20 can assist in actuating a valve, such as a poppet valve 26 .
- a valve such as a poppet valve 26 .
- an operator will move the actuator, such as lever 13 , and the stem 20 therewith, upwardly relative to the main body 12 to open the valve 26 .
- the stem 20 moves back downwardly, such as under a bias force, the valve 26 closes.
- the stem 20 may be provided with an optional wear resistant tip 24 made from a material with a relatively low coefficient of friction.
- the seal 50 is retained by an insertable and removable module 28 , according to principles of the present invention.
- the module 28 can be selectively engaged with the main body 12 , such as via threads or other suitable engagement methods.
- the module 28 can include multiple components for retaining and holding the seal 50 , which provides a seal against the stem 20 .
- the module 28 holds the seal 50 even when the module is disengaged from the main body 12 .
- module 28 also retains a seal 48 which provides a seal against the main body 12 .
- the module 28 of this embodiment can provide improved sealing performance and durability, as well as increase the ease of assembling the components of the stem seal assembly 18 .
- the removable seal module 28 of this embodiment is shown in more detail in FIG. 2 (comprising FIGS. 2 a and 2 b ).
- this embodiment of the module 28 includes a stainless steel sleeve 30 having an internal passage 32 for slidingly receiving the stem 20 .
- the passage 32 includes a wide passage portion 31 at the upper end of the sleeve 30 , which transitions to a narrow passage portion 33 .
- the module 28 also includes a bushing 34 which is engaged within the wide passage portion 31 of the sleeve 30 .
- the bushing 34 can be made from a plastic or other suitable low friction material, such as a DELRIN material for example. The bushing 34 can therefore be used, if desired, to reduce friction against the stem 20 as it moves axially within the module 28 .
- the module 28 retains one or more seals for use in the poppet valve stem seal assembly.
- the sleeve 30 includes recesses or voids for placement of two seals which resists leakage of fuel as it flows through the dispenser.
- a first recess comprises a groove 36 formed in the exterior of the sleeve 30 .
- Within the groove 36 is held a housing seal member 48 to thereby retain the seal 48 within the module 28 when it is disengaged from the main body/housing 12 ( FIG. 1 ).
- the seal 48 abuts the housing 12 to provide a fluid tight seal therewith to resist the leakage of fluid along the interface between the module 28 and the housing 12 .
- the seal 48 can comprise a ring-like or other appropriate seal member, such as an O-ring made from a nitrile (e.g., Buna) material for instance.
- the module 28 retains (e.g., houses) a second seal 50 for providing a seal against the stem 20 . Accordingly, this seal 50 is likewise retained by the module 28 prior to the module being engaged with the housing 12 .
- the sleeve 30 includes a recess 37 at one end, formed by a narrow wall portion 39 and an interior seat 38 . Accordingly, the ring-like seal 50 resides within the recess 37 and against the seat 38 , with the narrow wall 39 surrounding the seal.
- the module 28 can further include a guide or cap 42 , for additional support in retaining the seal 50 .
- the diameter of the end portion 43 of the guide 42 is approximately the same as the inner diameter of the recess 37 between walls 39 . Accordingly, an interference fit or engagement is provided between the end portion 43 of the guide 42 and the recess 37 of the sleeve.
- Guide 42 can likewise be made of a friction reducing material, such as DELRIN for example.
- An extension 41 from the guide 42 can be provided as stop to abut the wall 39 when the guide 42 is engaged with the sleeve 30 .
- seal 50 is held within two nested components ( 42 and 30 ) of the module 28 , in this embodiment.
- a separate seal 48 is provided to seal against the housing 12 of the dispenser. Seal 48 does not also seal against the stem 20 , decreasing its potential for any appreciable movement caused by the stem. Likewise, seal 50 does not seal against the porous housing, decreasing the potential for seal 50 to fail.
- a poppet stem seal 50 against a housing 12 can gradually wear the finish of the housing, as the seal moves slightly in response to movement of the stem 20 , exposing the porous material of the housing. The friction between the porous housing material and the seal 50 can then quickly deteriorate the seal.
- the seal 50 is isolated from and does not contact the housing 12 , but rather contacts walls 39 of the sleeve 30 , which, according to additional aspects, can be made from a low friction, smooth, and/or non-porous material, such as stainless steel for example. Because the sliding stem seal 50 contacts this material rather than the housing, it has been found to exhibit improved durability, even though the seal may move slightly within the module 28 as the stem 20 slides against the seal.
- seal 48 is isolated from movement of the stem 20 and does not contact the stem, it does not experience appreciable movement and therefore does not experience frictional wear against the porous housing 12 .
- seal 48 can be slided over the exterior surface of the sleeve 30 until it rests in groove 36 .
- the bushing 34 is placed into the chamber until it reaches the narrow passage 33 such that it abuts and mates with the sleeve 30 .
- Seal 50 can be placed into recess 37 , and guide 42 can be pressed into the recess 37 until extension 41 reaches and is stopped by the bottom wall 39 . Accordingly, the module 28 is ready to receive the stem 20 and to be engaged with the housing 12 .
- the seals 48 and 50 are assembled with and retained by the module when it is disengaged from the fluid dispenser housing 12 , and can be later placed into the fluid dispenser without the need for special tools and without requiring difficult placements of small parts.
- the entire module 28 can be placed into the housing 12 as a complete unit, such as by engaging threaded portion 35 with a corresponding threaded portion 15 within the housing 12 (See FIG. 1 ).
- the stem 20 can be placed through the center of the sleeve 30 , and its interior bushing 34 and seal 50 , as well as through the center of the guide 42 engaged with the sleeve 30 . All of these components in this embodiment therefore have a passage through their center having a diameter, at least at some portion, that is approximately the same as or slightly larger than the diameter 21 of the stem 20 . Accordingly, stem 20 slides axially through the center of the module 28 .
- the seal 50 in this example also includes a flared end such that its opening near that end is slightly smaller in diameter than the diameter 21 of the stem 20 . Accordingly, after the stem 20 is inserted through the module 28 , the flared end of the seal 50 compresses somewhat between circular wall 39 and the exterior surface of the stem 20 , providing a fluid resistant seal at the point of compression.
- the seal 50 can include a base 56 and a flared end 51 with an inner flange 52 and an outer flange 54 .
- Inner flange 52 flares radially toward the stem 20 (i.e., in a generally inward direction) while the outer flange 54 flares radially away from the stem 20 (i.e., in a generally outward direction).
- the seal 50 is arranged such that the inner flange 52 contacts the outer surface 22 of the stem 20 to create a seal therewith along a circumferential contact surface, edge or lip 64 . Because the stem 20 is round in this embodiment, the inner flange 52 provides a first or inner ring-like seal at the contact surface, edge or lip 64 .
- the inner flange 52 is deflected slightly inward such that a relatively small portion of the inner flange 52 is in at least partially compressed contact with the outer stem surface 22 .
- Providing a smaller area of contact lowers the friction force between the stem and seal in use, thereby improving the functionality (e.g., ease of actuation and sliding, with superior sealing) of the fluid dispensing assembly while preventing undue wear of either the seal 50 or the stem 20 .
- the seal 50 can also be arranged such that the outer flange 54 contacts an inner surface of the module sleeve 30 to similarly create a seal therewith.
- the outer flange 54 thus provides a second or outer ring-like seal adjacent the inner surface of the sleeve.
- the first ring-like seal can be at least substantially concentric with the second ring-like seal, via surfaces 64 and 66 .
- the ring-like contact can be a knife-like contact (e.g., near surface, edge or lip 64 , 66 ) or a limited vertical contact surface.
- the seal 50 is thus provided in the shape of a torus or general donut shape having an opening in the center (i.e., either in the center or off-center depending upon the application) to receive and sealingly engage the stem 20 in use.
- the entire seal 50 , or at least the outer surface of the flared end 51 may be made of, or coated with, a material that reduces the coefficient of friction, improves durability when contacting fuel, and/or improves abrasion resistance of the seal.
- the seal 50 may consist of entirely or essentially, or partially comprise, a friction reducing material, such as a fluorocarbon polymer for example.
- a friction reducing material such as a fluorocarbon polymer for example.
- polytetrafluoroethylene, fluorinated ethylene-propylene, ethylene tetrafluoroethylene, or perfluoroalkoxy may be utilized, such as those types of materials marketed under the trademark TEFLON® (as available from E.I.
- the inner surface 74 of the sleeve 30 and/or the outer surface 22 of the stem 20 may be made of low friction materials and/or appropriately finished or coated/treated to further prevent undue friction and wear, and to optimize the service life of the assembly.
- the outer surface 22 of the stem 20 may be optionally finished with a finish of at least 12 for use with a seal 50 having a TEFLON coating, or comprising or consisting of TEFLON.
- the material used to construct the seal 50 preferably results in a dynamic and/or static coefficient of friction relative to the stem of less than about 0.1, such as less than about 0.05 for example, which can result in improved performance of the fueling nozzle.
- using a seal made from TEFLON and a stem made from stainless steel can provide a coefficient of friction of the seal relative to the stem of about 0.04.
- the seal 50 of at least some embodiments embodiment can also be energized such that the flared end 51 will include an appropriate positive or active outward radial bias to provide sufficient pressure, and therefore provide a sufficient fluid seal to minimize any potential for leakage along the stem 20 and between the stem and the sleeve 30 , when the nozzle is in either a low-pressure mode or a zero-pressure mode.
- the term “energized” refers to any material, structure, or combination of material and structures which tends to bias the inner and outer flanges outwardly from the seal body so that, in use, sealing contact can be positively or actively maintained even where there are no fluid pressure forces compressing the seal.
- the flared end 51 of the seal 50 includes a recess 62 between the inner and outer flanges (as best shown in FIG. 4 b ).
- a recess 62 between the inner and outer flanges (as best shown in FIG. 4 b ).
- the flared end 51 with a recess 62 permits the flared end to expand under the influence of fluid pressure to allow the outer surfaces of the flanges to also more efficiently seal as fluid pressure increases.
- the flared end 51 of this embodiment may be energized by the choice of materials or other geometrical characteristics of the flared end.
- the flared end may be formed as a composite of different materials having different properties.
- the energizing of the flared end is achieved with an energizing member 60 as best shown in FIGS. 3-4 .
- the energizing member 60 can be at least partially located within the recess 62 of the seal 50 . It is understood that the energizing member 60 may alternatively be substantially or entirely located within the recess.
- the energizing member 60 may be encapsulated within the flared end of the seal.
- the energizing member may be fabricated from a different material and then embedded and concealed within the flared end.
- energizing members 60 could be utilized. For example, due to differing material properties, the energizing member could then act to energize the flared end 51 of the seal. In other examples, a wedge could be used as the energizing member to cause the flanges to bias away from one another. In other examples, the energizing member could take the form of a pressurized bladder, an O-ring, or material compressed within the flared end of the seal, or any material or component suitable to cause the flanges 52 and 54 to bias away from one another.
- energizing members with square, rectangular, triangular, wedge-shaped, or other cross sectional shapes, or that the energizing member could be removed.
- a single energizing member is illustrated in the embodiments, it is understood that a plurality of energizing members could be provided, and that the energizing member need not be unitary in nature.
- a plurality of spaced, or overlapping energizing members might be placed within a recess.
- a plurality of O-rings could be stacked, one upon another, or concentrically arranged.
- energizing members such as spheres or ball bearings could be radially arranged at least partially within the recess of the seal.
- seal 50 could be formed with a plurality of recesses that can each receive one or more energizing members.
- the energizing member could take other forms, such as a hollow ring.
- the energizing member may take the form of a coil spring, or similar arrangement, connected end-to-end in the shape of a torus.
- an energizing member 60 that takes the form of a cantilevered spring.
- the figures depict the energizing member 60 in the form of a cantilever spring, comprising a plurality of fingers which serve to provide a force against the seal 50 , to improve sealing performance.
- FIGS. 3 a , 3 b , and 4 b illustrate the seal 50 and cantilever spring 60 of this embodiment in more detail.
- FIG. 4 a illustrates the cantilever spring 60 , without the seal 50 which retains the spring.
- the spring 60 is disposed in the recess 62 of the seal 50 , and comprises a cantilever spring having a plurality of fingers 92 .
- Each of the fingers 92 runs between an inner wall 94 of the seal 50 and an outer wall 96 of the seal, the inner and outer walls defining the recess of the open, hollow, donut-shaped seal 50 . Accordingly, the fingers 92 are each bent or otherwise disposed in a general U-shape within the recess 62 .
- the seal can be provided with an inner top lip 98 and an outer top lip 99 , such that the two ends 93 of each finger 92 can be held under the respective inner surfaces 98 ′ and 99 ′ of these lips, and thereby be retained from exiting the open end 51 of the seal 50 .
- other structures can be provided to hold the spring 60 within the seal 50 .
- the fingers 92 are connected at their ends 93 , such as by an integral connection, which allows the spring 60 to form a single continuous unit from its two end points.
- the fingers 92 of the spring provide a substantially uniform or constant force or load on the inner and outer walls 94 and 96 of the seal 50 . It has been found that this arrangement can provide improved sealing performance of the lip 64 against the stem 20 and of the lip 66 against the sleeve 30 , even under varying loads, pressures, and conditions.
- finger-type springs As an alternative to the cantilever spring 60 , other finger-type springs, flexible fingers, or flexible linear members might be utilized. Such members can be disposed, bent, or compressed between the inner and outer walls 94 and 96 to provide force on these walls to improve the performance of the seal 50 .
- FIG. 5 depicts another embodiment of a stem seal module 70 made and operating according to principles of the present inventions.
- the module 70 includes a retainer or cap 72 , which can be made of a suitable material, such as a material that will reduce friction with the stem 20 .
- a metal or metal alloy could be utilized, such as an aluminum bronze alloy like AMPCO 18 .
- the retainer 72 can include a threaded portion 73 for threadably engaging the body or housing 12 of the nozzle, and thus for allowing the ease of insertion and removability of the module 70 .
- Other engagements between the retainer 72 and the body 12 could be utilized as alternatives.
- the retainer 72 includes a central passage or opening for receiving the stem 20 and allowing the stem to move freely upwardly and downwardly within the passage, in order to selectively permit and restrict the flow of fluid through the dispenser.
- the module 70 includes an insert 74 also having a central passage or opening 71 for receiving the stem 20 .
- the insert 74 also engages the retainer 72 forming a two piece module with an internal chamber.
- the retainer 72 includes a reduced diameter portion 77 having a diameter D 2
- the insert 74 includes thin upper walls 79 having a spacing slightly larger than the diameter D 2 such that the walls 79 of the insert 74 surround the reduced diameter portion 77 of the retainer 72 , until the upper surface of the walls abut the larger portion of the retainer 72 .
- the retainer 72 is nested within the insert 74 .
- Other structures for engaging the members 72 and 74 can be provided, such as by interference fittings, other piloted configurations, and/or threadable engagements or similar interlocking arrangements, for example. Because the distance between opposite surfaces of the walls 79 is larger than the diameter of the remainder of the central passage 71 of the insert 74 , a recess 78 is created, which is enclosed by the retainer 72 once the retainer and insert are engaged with one another. This recess 78 allows the module 70 to be assembled with and house a seal when it is engaged with and disengaged with the housing 12 .
- the module 70 further includes a seal 50 that can be retained by the removable module, even before it is engaged with the housing 12 .
- the seal 50 is held within the recess 78 .
- the seal 50 provides a sealing interface with the stem 20 as it moves in the dispenser.
- the seal can comprise a flanged seal with an internal energizing member, such as has been described above with respect to FIGS. 3-4 , or other suitable sealing member.
- the removable module 70 also includes a seal 76 that provides a seal against the housing 12 .
- This seal 76 in this embodiment, is separate from seal 50 which does not seal against the housing but rather seals against the stem 20 . Accordingly, the functions of sealing against the stem 20 and against the housing 12 are provided by separate seal structures in this embodiment.
- the seal 50 which can move slightly due to the stem movement, is isolated from and does not contact the potentially porous material of the housing 12 , but rather contacts the insert 74 which can be made of a smooth, low-friction, and/or non-porous material, such as a metal or metal alloy like AMPCO 18 for example.
- seal 76 is does not contact the stem, and is isolated from the stem movement, such that it experiences little movement against the porous housing 12 . Accordingly, improved durability and performance are achieved in this embodiment.
- a second recess 80 is provided and is defined by and resides between inner extension 81 and outer extension 83 . Accordingly, the seal 76 at least partially resides within the recess 80 .
- seal 76 may be sized slightly larger than the recess, such that, when the module 70 is threaded into the housing 12 , the seal 76 is compressed or crushed against the lower surface 84 of the inner chamber 17 for the poppet stem assembly, defined within the housing 12 .
- the seal 76 could comprise a crush seal O-ring made of a suitable material, such as an elastomer material.
- the extension 81 of the insert 74 engages the poppet stem opening formed in the housing 12 (at the bottom of chamber 17 ). Accordingly, the poppet stem 20 slidingly engages the insert 74 at this location as well.
- the seal 76 can be placed around the extension 81 of the insert 74 and pushed along the extension until it rests in the recess 80 .
- the seal 50 can be placed within the recess 78 , and the retainer 72 can then be engaged with the insert 74 . Accordingly, at this point, the seals 50 and 76 are held or retained by the module members.
- This assembly can occur separate from the fuel dispenser and without the need for separate tools or for careful placement of the seals within the dispenser.
- the module 70 can then be engaged with the housing 12 , such as by threading the retainer 72 into the housing chamber 17 . While threading the retainer 72 , the seal 76 compresses against the housing surface 84 , providing a fluid tight crush seal against the housing.
- the poppet stem 20 can be slided through the middle of the module 70 , and thus resides at the center of and is surrounded by the retainer 72 , the seal 50 , the insert 74 , and the seal 76 . All of these components in this embodiment therefore have a passage through their center having a diameter, at least at some portion, that is approximately the same as or slightly larger than the diameter of the stem 20 .
- the seal 50 can include a flange or extension that abuts the stem 20 to provide a fluid tight seal against the stem. As the stem is inserted through the module 70 , the seal 50 can compress radially within the recess 78 to provide the sealing force against the stem.
- the recess 78 restrains the seal 50 from movement as the stem 20 slides up and down against the seal 50 during use.
- the low friction material of the insert 74 results in reduced wear on the seal 50 as the stem moves.
- the seal 76 is isolated from the stem 20 and therefore does not move in response to the stem.
- FIGS. 6 and 7 depict embodiments of fuel dispensing assemblies made and operating according to principles of the present inventions, each being fitted with the sliding stem seal modules of FIGS. 2 and 5 respectively.
- the assembly includes a main body 101 / 201 , such as can be made of cast aluminum, and a stem assembly 102 / 202 , which can include a stainless steel stem and a wear resistant tip.
- the sealing system in these embodiments can include a removable module 28 / 70 which assists in retaining one or more seals ( 50 and 48 / 76 ), even when the module 28 / 70 is disengaged from the fuel dispenser, as was described in detail above.
- a manual lever or actuator assembly 119 / 219 can also be provided, which in this example includes a lever, a lower lever, a trigger, a spring to bias the trigger, and a rivet for securing the components.
- a disc holder 108 / 208 Near the top of the stem is provided a disc holder 108 / 208 which retains a disc 109 / 209 , both of which are provided on a skirt 110 / 210 .
- These components serve as an interface between the stem and the main spring 111 / 211 which biases the stem.
- O-rings 112 / 212 or similar seals can be provided for sealing of components, as shown.
- a filter screen 154 / 254 can also be provided to filter the pressurized fuel flowing through the nozzle from the inlet end 180 / 280 to the outlet end 190 / 290 .
- a guard sub-assembly 123 / 223 can also be provided to guide and protect the lever 119 / 219 , and can include a guard piece, a rack, and a rivet.
- the operation of the lever assembly 119 / 219 with respect to the stem assembly 102 / 202 can be similar to that described above with respect to the other embodiments.
- movement of the poppet stem 102 / 202 by the lever 119 / 219 can move the skirt 110 / 210 and disc 109 / 209 off of their seat, permitting fuel to flow through the housing, and in particular, from the inlet end 180 / 280 , around the poppet stem 102 / 202 and shut off components held within the housing (described below), and out the spout end 190 / 290 .
- Another spring 143 / 243 can be provided between a body cap 113 / 213 and a vapor valve 141 / 241 , which can comprise, for example, a valve body, a stem 142 / 242 , a lip seal, an insert, retaining rings, and a disc and disc holder.
- the spring 143 / 243 can be used for biasing the vapor valve.
- Another retaining ring 135 / 235 can be provided for retention of components.
- the vapor valve can operate as known in the art for flow of vapors.
- a shut-off valve assembly 132 / 232 can be provided for automatic shut off of the fuel flow upon detection of a full condition in a fuel tank.
- This assembly can include a diaphragm biased by a spring, a support cup, a support, and other components such as a snubber, a wear washer, and a cap.
- a diaphragm sub-assembly 133 / 233 can be provided, which can include a diaphragm and diaphragm support, a lower diaphragm connector, a flat washer, and an upper pin and spring pin.
- Additional shut-off components can include a diaphragm spring 114 / 214 , a latch spring 115 / 215 , a latch ball 122 / 222 , a latch ring 134 / 234 , and a latch plunger 116 / 216 , and the shut-off components can connect with the lever 119 / 219 via a plunger pin 120 / 220 and push nut 121 / 221 .
- These components can operate in ways known in the art, or later to be developed, for automatic shut off of the nozzle, such as by using Venturi vacuum principles for example.
- the spout end of the fueling nozzle can include a spout sub-assembly 118 / 218 including a tube, spring, poppet, bleeder seat ring/outer tube, sleeve, and ferrule, as well as various O-rings for sealing, and retaining rings for securing components.
- a vapor escape guard 148 / 248 , and clamp 149 / 249 therefor, can also be provided to prevent escape of vapors.
- An anchor spring 155 / 255 and ring 156 / 256 can also be utilized.
- the spout components can operate as known in the art or in a desired manner.
- Other components can also be provided, as needed or desired, to create the appropriate fueling nozzle for the application at issue.
- rivets 125 / 225 and screws 130 / 230 can be provided for securing components together
- insulating material 126 / 226 and 140 / 240 can be provided to insulate the metal pieces from the user
- identification washer 136 / 236 and screw 137 / 237 can be provided for identification of the nozzle
- O-rings 138 / 238 , 139 / 239 , 128 / 228 , 129 / 229 , and 124 / 224 can be provided for appropriate sealing of components.
- the modules 28 and 70 of these embodiments therefore operate to seal fluid from leaking along the stem or along the main body.
- These modules 28 and 70 can exhibit increased durability and performance and reduced assembly requirements.
- the module is shown as comprising multiple engaged members and two seals in some embodiments, the module could comprise a single integrated component and/or a single seal in other embodiments of the invention.
- the module could comprise a single integrated component and/or a single seal in other embodiments of the invention.
- multiple inventive aspects have been presented, such aspects need not be utilized in combination, and various combinations of aspects are possible in light of the various embodiments provided above. Accordingly, it is intended to embrace all possible alternatives, modifications, combinations, and variations that have been discussed and suggested herein, and all others that fall within the principles, spirit and broad scope of the inventions as defined by the claims.
Abstract
Description
- This application is related to U.S. patent application Ser. No. ______ (Attorney Docket No. 3356-179) filed on Nov. 18, 2004, entitled Liquid Dispenser with Stem Sealing System, the entire disclosure of which is hereby incorporated herein by reference.
- This invention relates generally to liquid dispensing devices, and more particularly to seal assemblies for liquid dispensing devices.
- Fluid dispensers include a variety of components for selectively controlling the flow of and dispensing a fluid. Fuel dispensing systems can include, for example, a stem for assisting in actuating a poppet valve between opened and closed positions to control fluid flow between an inlet and outlet port. For instance, a fluid dispensing system is described in U.S. Pat. No. 3,811,486 (the '486 Patent) to Wood, the entire disclosure of which is hereby incorporated herein by reference.
- Fluid dispensing assemblies or nozzles can comprise a main body with an inlet port adapted to communicate with a source of pressurized fluid, and an outlet port adapted to dispense fluid from the main body. In such devices, a stem, for actuating a valve, slides relative to a seal or to a packing (typically loose material stuffed around the stem in a chamber). As described in further detail in the referenced '486 patent, the stem, together with a lever, can assist in actuating the valve, such as a poppet valve, to control fluid dispensing.
- Typically, the packing, an O-ring or a related flanged lip seal has been provided to prevent leakage of fluid along the stem, and more particularly between the stem and portions of the main body. In some devices, a flanged lip seal with an internal O-ring energizer has been utilized.
- However, such seals and sealing systems have exhibited problems with respect to sealing performance and/or durability. For example, such seals may exhibit rapid deterioration and wear from movement within the dispenser. Accordingly, the seal can become quickly compromised, resulting in leakage of the fluid. In addition, such seals typically have an inner surface which seals against the moving stem, or other component, and an outer surface which seals against the stationary dispenser body. Friction from movement of the seal caused by movement of the stem can compromise the sealing surface against the stem as well as the sealing surface against the stationary body.
- In addition, inserting a seal into a dispensing device can be time consuming and tedious. The seal is typically small and required to be fitted within a narrow chamber. Often, specialized tools are required to compress the seal and place it into the housing of the dispenser against the components being sealed.
- Accordingly, it is desired to obviate problems and shortcomings of conventional seal assemblies. More particularly, in some embodiments, it is desired to provide improvements in durability and/or performance of seals in fluid dispensing apparatus. Moreover, in some embodiments, it is desired to reduce the difficulty and minimize the time needed for assembling a fluid dispensing apparatus.
- According to one aspect, a fluid dispenser is provided comprising a fluid dispenser housing having an inner chamber defined by a chamber surface, and a cylindrical stem that includes an outer surface. The stem is configured to control the flow of fluid through said housing. The dispenser also includes an insertable module which is selectively engaged with said inner chamber and includes an opening slidingly receiving said stem. A stem seal member is retained by said module and is in sealing contact with the outer surface of the cylindrical stem when the module is engaged with the inner chamber to provide a first seal. The stem seal member is separated from the housing by a portion of the module and the said stem seal member contacts the stem and a substantially non-porous portion of said module. The assembly also includes a housing seal member retained by the module and in sealing contact with the chamber surface of the housing when the module is engaged with the inner chamber to provide a second seal. The housing seal member is separated from the stem by a portion of the module whereby the second seal provides a static seal against the chamber surface. The module is configured to retain the stem seal member and the housing seal member when the module is disengaged from the chamber.
- According to another aspect, a fluid dispensing assembly is provided comprising a main body including an inlet port adapted to communicate with a source of pressurized fluid and an outlet port adapted to dispense fluid from said main body, the main body including an inner chamber defined by a chamber surface. The assembly also includes a stem having an outer surface, wherein the stem is adapted to assist in regulating fluid between said inlet port and said outlet port of said main body. In addition, the assembly includes a stem seal having an opening slidably receiving the stem and comprising an inner sealing surface, wherein the inner sealing surface sealingly contacts the outer surface of the stem to provide a first seal. In addition, the assembly includes a body seal sealingly contacting the chamber surface of the body to provide a second seal, and a module configured to selectively engage the inner chamber and including an opening for receiving the stem. The module is adapted to retain the stem seal and the body seal when the module is disengaged from the chamber. The stem seal provides the first seal against the stem when the module engages the inner chamber and the body seal provides the second seal against the chamber surface when the module engages the inner chamber. The assembly further includes a manual actuator adapted to control movement of the stem and control the flow of fluid through the main body.
- According to an additional aspect, a fluid dispenser is provided comprising a main body including an inlet port adapted to communicate with a source of pressurized fuel and an outlet port adapted to dispense fuel from said main body, wherein said main body includes an inner chamber defined by a chamber surface. The dispenser also includes a seal having a sealing surface, wherein the sealing surface sealingly contacts a component of the fuel dispensing assembly to provide a first seal. The dispenser also comprises an insertable retainer configured to selectively engage the inner chamber, wherein the retainer is adapted to retain the seal when the retainer is disengaged from said chamber, and wherein the seal provides the first seal against the assembly component when the retainer engages the inner chamber. The dispenser also includes a manual actuator adapted to control the flow of fuel through the main body, and a shut-off actuator configured to automatically shut off flow of fuel through the main body in response to a fill condition.
- According to another aspect, a method for assembling a fuel dispensing apparatus is provided, the method comprising placing a seal on a module such that the seal is held on said module, and providing components for assembling a fuel dispensing apparatus. The method also comprises engaging the module with a housing for a fuel dispensing apparatus, such that the seal contacts at least one of the housing and the components and provides a fluid-tight seal therewith. The method further comprises assembling the components and the housing as a fuel dispensing apparatus.
- In accordance with another aspect, a fluid dispenser is provided comprising a fluid dispenser housing having an inner chamber defined by a chamber surface, and a poppet stem assembly residing within the inner chamber. The poppet stem assembly comprises a cylindrical stem including an outer surface, the stem being configured to control the flow of fluid through the housing. The assembly also includes a stem seal member in sealing contact with the outer surface of said cylindrical stem to provide a first seal, wherein the stem seal member does not contact said housing. In addition, the assembly includes a housing seal member in sealing contact with the chamber surface of the housing to provide a second seal, wherein the housing seal member does not contact the stem.
- Still other aspects of the present invention will become apparent to those skilled in the art from the following description wherein there are shown and described alternative illustrative embodiments including inventive aspect. These embodiments and descriptions are provided only as illustrative examples, and in no way are intended, nor should they be interpreted, as limiting. As will be realized, the invention is capable of other different embodiments, all without departing from the scope of the invention. These other possible embodiments will be understood by those skilled in the art based upon the description and teachings herein. Accordingly, the drawings and descriptions should be regarded as illustrative and exemplary in nature only, and not as restrictive.
- While the specification concludes with claims particularly pointing out and distinctly claiming the inventive aspects, it is believed the same will be better understood from the following description taken in conjunction with the accompanying drawings in which:
-
FIG. 1 is a partial sectional view of an illustrative embodiment of a fluid dispensing assembly, made and operating in accordance with principles of the present invention; -
FIG. 2 a is a cross sectional view of an illustrative embodiment of a poppet stem seal module, made and operating according to principles of the present invention; -
FIG. 2 b is a perspective view of the module ofFIG. 2 a; -
FIG. 3 a is a cross sectional view of an illustrative embodiment of a seal that can be used in the stem seal module ofFIGS. 1 and 2 , in accordance with principles of the present invention; -
FIG. 3 b is a top view of the seal ofFIG. 3 a; -
FIG. 4 a is a perspective view of an illustrative embodiment of the cantilever spring of the seal ofFIGS. 3 a and 3 b; -
FIG. 4 b is a perspective view of the seal ofFIGS. 3 a and 3 b; -
FIG. 5 is a partial sectional view of another illustrative embodiment of a fluid dispensing assembly, made and operating in accordance with principles of the present invention; -
FIG. 6 is a cross sectional view of an illustrative embodiment of a fueling nozzle which includes the insertable poppet stem seal module ofFIG. 2 , and which is made and operating according to principles of the present invention; and -
FIG. 7 is a cross sectional view of an illustrative embodiment of a fueling nozzle which includes the insertable poppet stem seal module ofFIG. 5 , and which is made and operating according to principles of the present invention. -
FIG. 1 depicts a fluid dispensing assembly 10, made and operating in accordance with principles of the present invention. The fluid dispensing assembly 10 includes amain body 12 with an inlet port 14 adapted to communicate with a source of pressurized fluid. For instance, in fuel dispensing applications, a high pressure fuel hose can be removably connected to the inlet port 14 to allow a fuel pump (not shown) such as in a gasoline station to act as a source of pressurized fuel for the fuel nozzle 10. The fluid dispensing assembly 10 further includes anoutlet port 16 adapted to dispense fluid from themain body 12. In fuel dispensing applications, theoutlet port 16 can take the form of a familiar spout or other device adapted to communicate with the inlet opening of a vehicle fuel tank. - As further illustrated in
FIG. 1 , the fluid dispensing assembly 10 may include a slidingstem seal assembly 18, wherein astem 20 may axially reciprocate relative to astem seal member 50 as discussed more fully below. Thestem 20 is adapted to assist in regulating fluid between the inlet port 14 and theoutlet port 16. For example, as illustrated inFIG. 1 , thestem 20 can assist in actuating a valve, such as apoppet valve 26. In order to dispense fluid, an operator will move the actuator, such aslever 13, and thestem 20 therewith, upwardly relative to themain body 12 to open thevalve 26. When thestem 20 moves back downwardly, such as under a bias force, thevalve 26 closes. To reduce wear and friction between thestem 20 and thelever 13, thestem 20 may be provided with an optional wearresistant tip 24 made from a material with a relatively low coefficient of friction. - In this embodiment, the
seal 50 is retained by an insertable andremovable module 28, according to principles of the present invention. Themodule 28 can be selectively engaged with themain body 12, such as via threads or other suitable engagement methods. Themodule 28 can include multiple components for retaining and holding theseal 50, which provides a seal against thestem 20. Themodule 28 holds theseal 50 even when the module is disengaged from themain body 12. In this embodiment,module 28 also retains aseal 48 which provides a seal against themain body 12. As will be discussed in more detail below, themodule 28 of this embodiment can provide improved sealing performance and durability, as well as increase the ease of assembling the components of thestem seal assembly 18. - The
removable seal module 28 of this embodiment is shown in more detail inFIG. 2 (comprisingFIGS. 2 a and 2 b). As shown, this embodiment of themodule 28 includes astainless steel sleeve 30 having aninternal passage 32 for slidingly receiving thestem 20. Thepassage 32 includes awide passage portion 31 at the upper end of thesleeve 30, which transitions to anarrow passage portion 33. Themodule 28 also includes abushing 34 which is engaged within thewide passage portion 31 of thesleeve 30. Thebushing 34 can be made from a plastic or other suitable low friction material, such as a DELRIN material for example. Thebushing 34 can therefore be used, if desired, to reduce friction against thestem 20 as it moves axially within themodule 28. - The
module 28 retains one or more seals for use in the poppet valve stem seal assembly. In particular, in this embodiment, thesleeve 30 includes recesses or voids for placement of two seals which resists leakage of fuel as it flows through the dispenser. In this example, a first recess comprises agroove 36 formed in the exterior of thesleeve 30. Within thegroove 36 is held ahousing seal member 48 to thereby retain theseal 48 within themodule 28 when it is disengaged from the main body/housing 12 (FIG. 1 ). However, when themodule 28 is inserted into thehousing 12, theseal 48 abuts thehousing 12 to provide a fluid tight seal therewith to resist the leakage of fluid along the interface between themodule 28 and thehousing 12. Theseal 48 can comprise a ring-like or other appropriate seal member, such as an O-ring made from a nitrile (e.g., Buna) material for instance. - In addition, the
module 28 retains (e.g., houses) asecond seal 50 for providing a seal against thestem 20. Accordingly, thisseal 50 is likewise retained by themodule 28 prior to the module being engaged with thehousing 12. In particular, in this embodiment, thesleeve 30 includes arecess 37 at one end, formed by anarrow wall portion 39 and aninterior seat 38. Accordingly, the ring-like seal 50 resides within therecess 37 and against theseat 38, with thenarrow wall 39 surrounding the seal. - The
module 28 can further include a guide orcap 42, for additional support in retaining theseal 50. In particular, in this embodiment, the diameter of theend portion 43 of theguide 42 is approximately the same as the inner diameter of therecess 37 betweenwalls 39. Accordingly, an interference fit or engagement is provided between theend portion 43 of theguide 42 and therecess 37 of the sleeve.Guide 42 can likewise be made of a friction reducing material, such as DELRIN for example. Anextension 41 from theguide 42 can be provided as stop to abut thewall 39 when theguide 42 is engaged with thesleeve 30. - Accordingly, with reference to
FIGS. 1-2 , seal 50 is held within two nested components (42 and 30) of themodule 28, in this embodiment. By tightly containing theseal 50 within themodule 28 according to principles of the present invention, less movement of theseal 50 results when thestem 20 axially slides against theseal 50 during use. Accordingly, better performance and durability can result. In addition, in this embodiment, aseparate seal 48 is provided to seal against thehousing 12 of the dispenser.Seal 48 does not also seal against thestem 20, decreasing its potential for any appreciable movement caused by the stem. Likewise, seal 50 does not seal against the porous housing, decreasing the potential forseal 50 to fail. In particular, it has been found that placement of apoppet stem seal 50 against ahousing 12 can gradually wear the finish of the housing, as the seal moves slightly in response to movement of thestem 20, exposing the porous material of the housing. The friction between the porous housing material and theseal 50 can then quickly deteriorate the seal. In this embodiment, however, theseal 50 is isolated from and does not contact thehousing 12, but rathercontacts walls 39 of thesleeve 30, which, according to additional aspects, can be made from a low friction, smooth, and/or non-porous material, such as stainless steel for example. Because the slidingstem seal 50 contacts this material rather than the housing, it has been found to exhibit improved durability, even though the seal may move slightly within themodule 28 as thestem 20 slides against the seal. In addition, becauseseal 48 is isolated from movement of thestem 20 and does not contact the stem, it does not experience appreciable movement and therefore does not experience frictional wear against theporous housing 12. - To assemble the
module 28,seal 48 can be slided over the exterior surface of thesleeve 30 until it rests ingroove 36. Thebushing 34 is placed into the chamber until it reaches thenarrow passage 33 such that it abuts and mates with thesleeve 30.Seal 50 can be placed intorecess 37, and guide 42 can be pressed into therecess 37 untilextension 41 reaches and is stopped by thebottom wall 39. Accordingly, themodule 28 is ready to receive thestem 20 and to be engaged with thehousing 12. Thus, theseals fluid dispenser housing 12, and can be later placed into the fluid dispenser without the need for special tools and without requiring difficult placements of small parts. Rather, theentire module 28 can be placed into thehousing 12 as a complete unit, such as by engaging threadedportion 35 with a corresponding threadedportion 15 within the housing 12 (SeeFIG. 1 ). Thestem 20 can be placed through the center of thesleeve 30, and itsinterior bushing 34 andseal 50, as well as through the center of theguide 42 engaged with thesleeve 30. All of these components in this embodiment therefore have a passage through their center having a diameter, at least at some portion, that is approximately the same as or slightly larger than thediameter 21 of thestem 20. Accordingly, stem 20 slides axially through the center of themodule 28. Theseal 50 in this example also includes a flared end such that its opening near that end is slightly smaller in diameter than thediameter 21 of thestem 20. Accordingly, after thestem 20 is inserted through themodule 28, the flared end of theseal 50 compresses somewhat betweencircular wall 39 and the exterior surface of thestem 20, providing a fluid resistant seal at the point of compression. - More specifically, as best seen in
FIGS. 2-4 , theseal 50 can include abase 56 and a flaredend 51 with aninner flange 52 and anouter flange 54.Inner flange 52 flares radially toward the stem 20 (i.e., in a generally inward direction) while theouter flange 54 flares radially away from the stem 20 (i.e., in a generally outward direction). In one embodiment, theseal 50 is arranged such that theinner flange 52 contacts theouter surface 22 of thestem 20 to create a seal therewith along a circumferential contact surface, edge orlip 64. Because thestem 20 is round in this embodiment, theinner flange 52 provides a first or inner ring-like seal at the contact surface, edge orlip 64. In use, theinner flange 52 is deflected slightly inward such that a relatively small portion of theinner flange 52 is in at least partially compressed contact with theouter stem surface 22. Providing a smaller area of contact lowers the friction force between the stem and seal in use, thereby improving the functionality (e.g., ease of actuation and sliding, with superior sealing) of the fluid dispensing assembly while preventing undue wear of either theseal 50 or thestem 20. - The
seal 50 can also be arranged such that theouter flange 54 contacts an inner surface of themodule sleeve 30 to similarly create a seal therewith. Theouter flange 54 thus provides a second or outer ring-like seal adjacent the inner surface of the sleeve. In certain embodiments of the present invention, and as illustrated inFIG. 3 b, the first ring-like seal can be at least substantially concentric with the second ring-like seal, viasurfaces - The ring-like contact can be a knife-like contact (e.g., near surface, edge or
lip 64, 66) or a limited vertical contact surface. Theseal 50 is thus provided in the shape of a torus or general donut shape having an opening in the center (i.e., either in the center or off-center depending upon the application) to receive and sealingly engage thestem 20 in use. - With reference to
FIGS. 1-4 , and according to at least some embodiments, theentire seal 50, or at least the outer surface of the flaredend 51 may be made of, or coated with, a material that reduces the coefficient of friction, improves durability when contacting fuel, and/or improves abrasion resistance of the seal. For instance, theseal 50 may consist of entirely or essentially, or partially comprise, a friction reducing material, such as a fluorocarbon polymer for example. In particular, polytetrafluoroethylene, fluorinated ethylene-propylene, ethylene tetrafluoroethylene, or perfluoroalkoxy may be utilized, such as those types of materials marketed under the trademark TEFLON® (as available from E.I. DuPont de Nemours). As an alternative, high performance friction reducing elastomers, such as POLYMOD® (as available from Polymod Technologies, Inc.), could be utilized, as could other friction reducing material compatible with theseal 50 and the application requirements. For example, elastomers which are polymer modified to have very low coefficients of friction and optimized wear life could also be utilized. - It has been found that particularly advantageous performance and durability (with respect to friction characteristics, and durability and size stability when in contact with fuel) can be attained by constructing substantially the
entire seal 50 using a TEFLON material. In addition, theinner surface 74 of thesleeve 30 and/or theouter surface 22 of thestem 20 may be made of low friction materials and/or appropriately finished or coated/treated to further prevent undue friction and wear, and to optimize the service life of the assembly. In one example of a fuel dispenser nozzle stem, theouter surface 22 of thestem 20 may be optionally finished with a finish of at least 12 for use with aseal 50 having a TEFLON coating, or comprising or consisting of TEFLON. The material used to construct theseal 50, partially or completely, preferably results in a dynamic and/or static coefficient of friction relative to the stem of less than about 0.1, such as less than about 0.05 for example, which can result in improved performance of the fueling nozzle. In particular, according to one embodiment of the invention, using a seal made from TEFLON and a stem made from stainless steel can provide a coefficient of friction of the seal relative to the stem of about 0.04. - As shown in
FIGS. 1-4 , theseal 50 of at least some embodiments embodiment can also be energized such that the flaredend 51 will include an appropriate positive or active outward radial bias to provide sufficient pressure, and therefore provide a sufficient fluid seal to minimize any potential for leakage along thestem 20 and between the stem and thesleeve 30, when the nozzle is in either a low-pressure mode or a zero-pressure mode. As used herein, the term “energized” refers to any material, structure, or combination of material and structures which tends to bias the inner and outer flanges outwardly from the seal body so that, in use, sealing contact can be positively or actively maintained even where there are no fluid pressure forces compressing the seal. In one example the flaredend 51 of theseal 50 includes arecess 62 between the inner and outer flanges (as best shown inFIG. 4 b). Optionally providing the flaredend 51 with arecess 62 permits the flared end to expand under the influence of fluid pressure to allow the outer surfaces of the flanges to also more efficiently seal as fluid pressure increases. - In another example, the flared
end 51 of this embodiment may be energized by the choice of materials or other geometrical characteristics of the flared end. In one example, the flared end may be formed as a composite of different materials having different properties. - In still further embodiments of the present invention, the energizing of the flared end is achieved with an energizing
member 60 as best shown inFIGS. 3-4 . As illustrated, the energizingmember 60 can be at least partially located within therecess 62 of theseal 50. It is understood that the energizingmember 60 may alternatively be substantially or entirely located within the recess. Furthermore, the energizingmember 60 may be encapsulated within the flared end of the seal. For example, the energizing member may be fabricated from a different material and then embedded and concealed within the flared end. - Various types of energizing
members 60 could be utilized. For example, due to differing material properties, the energizing member could then act to energize the flaredend 51 of the seal. In other examples, a wedge could be used as the energizing member to cause the flanges to bias away from one another. In other examples, the energizing member could take the form of a pressurized bladder, an O-ring, or material compressed within the flared end of the seal, or any material or component suitable to cause theflanges seal 50 could be formed with a plurality of recesses that can each receive one or more energizing members. With respect to some embodiments incorporating aspects of the inventions, the energizing member could take other forms, such as a hollow ring. In still other embodiments, the energizing member may take the form of a coil spring, or similar arrangement, connected end-to-end in the shape of a torus. - Returning to
FIGS. 1-4 , and in particular as best shown inFIGS. 4 a and 4 b, in some embodiments it has been found advantageous to use an energizingmember 60 that takes the form of a cantilevered spring. In particular, the figures depict the energizingmember 60 in the form of a cantilever spring, comprising a plurality of fingers which serve to provide a force against theseal 50, to improve sealing performance.FIGS. 3 a, 3 b, and 4 b illustrate theseal 50 andcantilever spring 60 of this embodiment in more detail.FIG. 4 a illustrates thecantilever spring 60, without theseal 50 which retains the spring. As shown in these figures, thespring 60 is disposed in therecess 62 of theseal 50, and comprises a cantilever spring having a plurality offingers 92. Each of thefingers 92 runs between aninner wall 94 of theseal 50 and anouter wall 96 of the seal, the inner and outer walls defining the recess of the open, hollow, donut-shapedseal 50. Accordingly, thefingers 92 are each bent or otherwise disposed in a general U-shape within therecess 62. To hold thefingers 92 within theseal 50, the seal can be provided with an innertop lip 98 and an outertop lip 99, such that the two ends 93 of eachfinger 92 can be held under the respectiveinner surfaces 98′ and 99′ of these lips, and thereby be retained from exiting theopen end 51 of theseal 50. Alternatively, other structures can be provided to hold thespring 60 within theseal 50. - In addition, in this embodiment, the
fingers 92 are connected at theirends 93, such as by an integral connection, which allows thespring 60 to form a single continuous unit from its two end points. By positioning and retaining thespring 60 in therecess 62 in this manner, thefingers 92 of the spring provide a substantially uniform or constant force or load on the inner andouter walls seal 50. It has been found that this arrangement can provide improved sealing performance of thelip 64 against thestem 20 and of thelip 66 against thesleeve 30, even under varying loads, pressures, and conditions. - As an alternative to the
cantilever spring 60, other finger-type springs, flexible fingers, or flexible linear members might be utilized. Such members can be disposed, bent, or compressed between the inner andouter walls seal 50. - Other embodiments are also possible. For example,
FIG. 5 depicts another embodiment of astem seal module 70 made and operating according to principles of the present inventions. In this embodiment, themodule 70 includes a retainer orcap 72, which can be made of a suitable material, such as a material that will reduce friction with thestem 20. For example, a metal or metal alloy could be utilized, such as an aluminum bronze alloy likeAMPCO 18. Theretainer 72 can include a threadedportion 73 for threadably engaging the body orhousing 12 of the nozzle, and thus for allowing the ease of insertion and removability of themodule 70. Other engagements between theretainer 72 and thebody 12 could be utilized as alternatives. Theretainer 72 includes a central passage or opening for receiving thestem 20 and allowing the stem to move freely upwardly and downwardly within the passage, in order to selectively permit and restrict the flow of fluid through the dispenser. - In addition, the
module 70 includes aninsert 74 also having a central passage oropening 71 for receiving thestem 20. Theinsert 74 also engages theretainer 72 forming a two piece module with an internal chamber. In particular, in this example, theretainer 72 includes a reduceddiameter portion 77 having a diameter D2, while theinsert 74 includes thinupper walls 79 having a spacing slightly larger than the diameter D2 such that thewalls 79 of theinsert 74 surround the reduceddiameter portion 77 of theretainer 72, until the upper surface of the walls abut the larger portion of theretainer 72. Thus, theretainer 72 is nested within theinsert 74. Other structures for engaging themembers walls 79 is larger than the diameter of the remainder of thecentral passage 71 of theinsert 74, arecess 78 is created, which is enclosed by theretainer 72 once the retainer and insert are engaged with one another. Thisrecess 78 allows themodule 70 to be assembled with and house a seal when it is engaged with and disengaged with thehousing 12. - In particular, the
module 70 further includes aseal 50 that can be retained by the removable module, even before it is engaged with thehousing 12. In particular, in this example, theseal 50 is held within therecess 78. Theseal 50 provides a sealing interface with thestem 20 as it moves in the dispenser. The seal can comprise a flanged seal with an internal energizing member, such as has been described above with respect toFIGS. 3-4 , or other suitable sealing member. - In this example, the
removable module 70 also includes aseal 76 that provides a seal against thehousing 12. Thisseal 76, in this embodiment, is separate fromseal 50 which does not seal against the housing but rather seals against thestem 20. Accordingly, the functions of sealing against thestem 20 and against thehousing 12 are provided by separate seal structures in this embodiment. Theseal 50, which can move slightly due to the stem movement, is isolated from and does not contact the potentially porous material of thehousing 12, but rather contacts theinsert 74 which can be made of a smooth, low-friction, and/or non-porous material, such as a metal or metal alloy likeAMPCO 18 for example. Similarly, seal 76 is does not contact the stem, and is isolated from the stem movement, such that it experiences little movement against theporous housing 12. Accordingly, improved durability and performance are achieved in this embodiment. - To retain the
seal 76 on the module, asecond recess 80 is provided and is defined by and resides betweeninner extension 81 andouter extension 83. Accordingly, theseal 76 at least partially resides within therecess 80. However, seal 76 may be sized slightly larger than the recess, such that, when themodule 70 is threaded into thehousing 12, theseal 76 is compressed or crushed against thelower surface 84 of theinner chamber 17 for the poppet stem assembly, defined within thehousing 12. For example, theseal 76 could comprise a crush seal O-ring made of a suitable material, such as an elastomer material. In this example, theextension 81 of theinsert 74 engages the poppet stem opening formed in the housing 12 (at the bottom of chamber 17). Accordingly, thepoppet stem 20 slidingly engages theinsert 74 at this location as well. - To assemble the
module 70 of this example, theseal 76 can be placed around theextension 81 of theinsert 74 and pushed along the extension until it rests in therecess 80. Theseal 50 can be placed within therecess 78, and theretainer 72 can then be engaged with theinsert 74. Accordingly, at this point, theseals module 70 can then be engaged with thehousing 12, such as by threading theretainer 72 into thehousing chamber 17. While threading theretainer 72, theseal 76 compresses against thehousing surface 84, providing a fluid tight crush seal against the housing. The poppet stem 20 can be slided through the middle of themodule 70, and thus resides at the center of and is surrounded by theretainer 72, theseal 50, theinsert 74, and theseal 76. All of these components in this embodiment therefore have a passage through their center having a diameter, at least at some portion, that is approximately the same as or slightly larger than the diameter of thestem 20. Theseal 50 can include a flange or extension that abuts thestem 20 to provide a fluid tight seal against the stem. As the stem is inserted through themodule 70, theseal 50 can compress radially within therecess 78 to provide the sealing force against the stem. Therecess 78 restrains theseal 50 from movement as thestem 20 slides up and down against theseal 50 during use. The low friction material of theinsert 74 results in reduced wear on theseal 50 as the stem moves. Theseal 76 is isolated from thestem 20 and therefore does not move in response to the stem. -
FIGS. 6 and 7 depict embodiments of fuel dispensing assemblies made and operating according to principles of the present inventions, each being fitted with the sliding stem seal modules ofFIGS. 2 and 5 respectively. These embodiments illustrate components that can be included, as desired or appropriate, when the inventive principles are applied to a fuel dispensing assembly. Examples of some such components will now be briefly described. In this example, the assembly includes amain body 101/201, such as can be made of cast aluminum, and astem assembly 102/202, which can include a stainless steel stem and a wear resistant tip. The sealing system in these embodiments can include aremovable module 28/70 which assists in retaining one or more seals (50 and 48/76), even when themodule 28/70 is disengaged from the fuel dispenser, as was described in detail above. - A manual lever or
actuator assembly 119/219 can also be provided, which in this example includes a lever, a lower lever, a trigger, a spring to bias the trigger, and a rivet for securing the components. Near the top of the stem is provided adisc holder 108/208 which retains adisc 109/209, both of which are provided on askirt 110/210. These components serve as an interface between the stem and themain spring 111/211 which biases the stem. O-rings 112/212 or similar seals can be provided for sealing of components, as shown. Afilter screen 154/254 can also be provided to filter the pressurized fuel flowing through the nozzle from theinlet end 180/280 to theoutlet end 190/290. Aguard sub-assembly 123/223 can also be provided to guide and protect thelever 119/219, and can include a guard piece, a rack, and a rivet. - The operation of the
lever assembly 119/219 with respect to thestem assembly 102/202 can be similar to that described above with respect to the other embodiments. In particular, movement of thepoppet stem 102/202 by thelever 119/219 can move theskirt 110/210 anddisc 109/209 off of their seat, permitting fuel to flow through the housing, and in particular, from theinlet end 180/280, around thepoppet stem 102/202 and shut off components held within the housing (described below), and out thespout end 190/290. - Another
spring 143/243 can be provided between abody cap 113/213 and avapor valve 141/241, which can comprise, for example, a valve body, astem 142/242, a lip seal, an insert, retaining rings, and a disc and disc holder. Thespring 143/243 can be used for biasing the vapor valve. Another retainingring 135/235 can be provided for retention of components. The vapor valve can operate as known in the art for flow of vapors. - In addition, a shut-off
valve assembly 132/232 can be provided for automatic shut off of the fuel flow upon detection of a full condition in a fuel tank. This assembly can include a diaphragm biased by a spring, a support cup, a support, and other components such as a snubber, a wear washer, and a cap. In addition, adiaphragm sub-assembly 133/233 can be provided, which can include a diaphragm and diaphragm support, a lower diaphragm connector, a flat washer, and an upper pin and spring pin. Additional shut-off components can include adiaphragm spring 114/214, alatch spring 115/215, alatch ball 122/222, a latch ring 134/234, and alatch plunger 116/216, and the shut-off components can connect with thelever 119/219 via aplunger pin 120/220 and pushnut 121/221. These components can operate in ways known in the art, or later to be developed, for automatic shut off of the nozzle, such as by using Venturi vacuum principles for example. - The spout end of the fueling nozzle can include a
spout sub-assembly 118/218 including a tube, spring, poppet, bleeder seat ring/outer tube, sleeve, and ferrule, as well as various O-rings for sealing, and retaining rings for securing components. Avapor escape guard 148/248, and clamp 149/249 therefor, can also be provided to prevent escape of vapors. Ananchor spring 155/255 andring 156/256 can also be utilized. The spout components can operate as known in the art or in a desired manner. - Other components can also be provided, as needed or desired, to create the appropriate fueling nozzle for the application at issue. For example, rivets 125/225 and
screws 130/230 can be provided for securing components together, insulatingmaterial 126/226 and 140/240 can be provided to insulate the metal pieces from the user,identification washer 136/236 and screw 137/237 can be provided for identification of the nozzle, and O-rings 138/238, 139/239, 128/228, 129/229, and 124/224 can be provided for appropriate sealing of components. - The
modules modules - The foregoing description of the various embodiments of the invention has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the inventions to the precise form disclosed. Many alternatives, modifications and variations will be apparent to those skilled in the art of the above teaching. For example, although the module is shown as comprising multiple engaged members and two seals in some embodiments, the module could comprise a single integrated component and/or a single seal in other embodiments of the invention. As another example, although multiple inventive aspects have been presented, such aspects need not be utilized in combination, and various combinations of aspects are possible in light of the various embodiments provided above. Accordingly, it is intended to embrace all possible alternatives, modifications, combinations, and variations that have been discussed and suggested herein, and all others that fall within the principles, spirit and broad scope of the inventions as defined by the claims.
Claims (27)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/991,797 US20060102246A1 (en) | 2004-11-18 | 2004-11-18 | Liquid dispenser with sealing module |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/991,797 US20060102246A1 (en) | 2004-11-18 | 2004-11-18 | Liquid dispenser with sealing module |
Publications (1)
Publication Number | Publication Date |
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US20060102246A1 true US20060102246A1 (en) | 2006-05-18 |
Family
ID=36384926
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/991,797 Abandoned US20060102246A1 (en) | 2004-11-18 | 2004-11-18 | Liquid dispenser with sealing module |
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US (1) | US20060102246A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140096868A1 (en) * | 2010-10-21 | 2014-04-10 | Delaware Capital Formation, Inc. | Fuel Dispensing Nozzle |
US20160116065A1 (en) * | 2013-06-04 | 2016-04-28 | Seal Engineering As | Pressure released wiper assembly for a sealing arrangement |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140096868A1 (en) * | 2010-10-21 | 2014-04-10 | Delaware Capital Formation, Inc. | Fuel Dispensing Nozzle |
US9260286B2 (en) * | 2010-10-21 | 2016-02-16 | Opw Fueling Components Inc. | Fuel dispensing nozzle |
US20160116065A1 (en) * | 2013-06-04 | 2016-04-28 | Seal Engineering As | Pressure released wiper assembly for a sealing arrangement |
US9599226B2 (en) * | 2013-06-04 | 2017-03-21 | Seal Engineering As | Pressure released wiper assembly for a sealing arrangement |
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Legal Events
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AS | Assignment |
Owner name: DELAWARE CAPITAL FORMATION, INC., DELAWARE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CLEVER, BRYAN W.;GARRISON, TIMOTHY M.;BALNOSCHAN, GREGORY A.;REEL/FRAME:016276/0801 Effective date: 20050103 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |
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AS | Assignment |
Owner name: OPW FUELING COMPONENTS INC., OHIO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CP FORMATION LLC;REEL/FRAME:030820/0448 Effective date: 20130701 Owner name: CLOVE PARK INSURANCE COMPANY, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DELAWARE CAPITAL FORMATION, INC.;REEL/FRAME:030820/0499 Effective date: 20130630 Owner name: CLOVE PARK INSURANCE COMPANY, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DELAWARE CAPITAL FORMATION, INC.;REEL/FRAME:030820/0476 Effective date: 20130630 Owner name: CP FORMATION LLC, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CLOVE PARK INSURANCE COMPANY;REEL/FRAME:030820/0462 Effective date: 20130630 |