WO2007129998A1

WO2007129998A1 - Check valve for vibrating piston pump

Info

Publication number: WO2007129998A1
Application number: PCT/UA2006/000037
Authority: WO
Inventors: Oleksandr Sergeyevich Barynin
Original assignee: Oleksandr Sergeyevich Barynin
Priority date: 2006-05-06
Filing date: 2006-06-06
Publication date: 2007-11-15
Also published as: DE212006000098U1; CN201265494Y; UA84716C2; RU2007102510A

Abstract

Check valve for vibrating piston pump comprises of axisymmetric bowl- shaped housing which includes a side-wall and a bottom and serves as the pump-housing part and inlet chamber of pump, at least one rigid axisymmetric seat equipped with at least one inlet for fluid medium intake and at least one fastened to the housing axisymmetric closure. At least a part of this closure, which is meant for opening/closing of the inlet, is made from resilient material. In order to increase productivity and operating reliability at pumping of viscous fluid media the closure is formed as a ring-like element and consisted of peripheral fastened to the housing part, and resilient part located near the housing side-wall. At that remote from the symmetry axis part of said bowl-shaped housing serves as the seat.

Description

CHECK VALVE FOR VIBRATING PISTON PUMP

Field of the Invention

The invention relates to design of check valves for equipment of vibrating piston pumps those are meant for pumping of fluid media on a liquid basis. Prior Art

Vibrating piston pumps are goods of mass production and use. They are simple in design and serviceable.

Each such pump (see, for example: DE 3729938; EP 0288216; SU 209210; SU 642521 ; SU 737645; SU 800436; SU 1788323; RU 2064095; RU 2066794; RU 2139453; US 4,047,852; US 4,169,696; WO 94/25753 and many others) usually comprises of:

(1) a flow-type pump housing;

(2) as a rule, an one rigid axisymmetric ring-like partition, which divides said housing in two communicating parts, namely:

(2.1) an inlet chamber for intake of fluid medium from an arbitrary source, and (2.2) a discharge chamber for pumping of fluid medium into a delivery pipe;

(3) a check valve which is set into the inlet chamber and comprises of:

(3.1) an axisymmetric rigid seat which is a part of the inlet chamber bottom usually and equipped with at least two inlets, and

(3.2) an axisymmetric closure which is fastened within the inlet chamber and includes a resilient part for opening/closing of the inlets;

(4) an axisymmetric piston which is placed within the discharge chamber of said pump housing near said ring-like partition and at least a peripheral part of which is made from resilient material (in particular, from wearproof rubber and etc.), and

(5) such (assembled with the piston) piston-rod geometrical axis of which coincides practically with the geometrical axes of all said axisymmetric details;

(6) a vibrodrive for reciprocal movement of said piston-rod together with the piston.

At least one electromagnet serves as^* said vibrodrive usually. The electromagnet drive winding is equipped with means for its connection to a source of alternating current, and the electromagnet anchor is connected with said piston-rod cinematically. Thus, vibration frequency of the piston is equal to doubled current oscillation frequency of used power system (i.e. about 100 Hz or about 120 Hz in accordance with working frequencies 50 Hz in Eurasia or 60 Hz in North America).' ^■

Furthermore, usual vibrating piston pump is equipped with a shock absorber that is fastened in the pump housing and connected to said anchor (directly or through said piston-rod). Vibrating piston pumps are using usually: for water supply of detached buildings or utility rooms from draw-wells or mining holes, for irrigation of farmlands and family farms using water taken from arbitrary superficial or underground reservoirs, for evacuation of aqueous and/or petroleum suspensions, petroleum products and the like from cavities and pits which appear because damages of pipelines or reservoirs, and etc.

Moreover, said pumps can be used: for pumping of sewage water or technological liquids those are included hard particles

(and present at food factories preferably), and, rare, for pumping of drilling fluids or sludge and, sometimes, for oil production from mining holes, the flush stage of which is all.

It is clear that places of vibrating piston pumps operation are located in most cases far from producer factories and maintenance shops of theirs. Therefore, users are interested in their productive and trouble-free operation even if pumpable fluid medium contains sand and/or other abrasive particles and/or its viscosity exceeds water viscosity appreciably.

However, abrasive particles and increased viscosity have various actions upon productivity and operating reliability of vibrating piston pumps. So, abrasive particles scuff any pump and, especially, any check valve details directly.

Therefore, it is clear that abrasive wear can be decreased: first, by selection of most wearproof materials, and, second, by use of a screen filter in front of said inlet chamber.

The first way is obvious and does not require any improvements of design of said pumps. The second way is ineffective in view of following reasons.

It is well known that filter efficiency increases as size of their holes reduces. Unfortunately, such useful result is accompanied by increase of hydraulic resistance to suction of fluid medium and decrease of pumping productivity. Therefore, use of small-meshed filters is possible, if amount of abrasive particles in a fluid medium is insignificant (for example, if upper clarified layer of water must be exhausted periodically from a draw-well or a mining hole).

If pumping of water-sand pulp, sludge etc. is needed then even coarse-mesh filters hide quickly by sediment and require frequent cleaning or replacement.

Viscosity of pumpable fluid media affects productivity and operating reliability of vibrating piston pumps indirectly. The point is that a volume of intake and pumpable portions of fluid medium in comparison with total volume of the inlet and discharge chambers decreases even more so frequency of piston vibrations in operating pump increases. Further, power consumption for fluid medium transfer increases according to increase of its viscosity because internal friction takes more and more energy. Therefore, increase viscosity call forth decrease of real volumes of fluid medium, which may be pumped in each production cycle (up to full stop of fluid medium transfer when pump drive operates).

Check valves exert considerable influence upon operating reliability and productivity of vibrating piston pumps.

In fact, abrasive wear of any check valve details hampers reliable closing of the inlets during each motion of the pump piston towards the inlet chamber. But even in absence of abrasive wear efficiency of closing of the inlets decreases as viscosity of pumpable fluid medium increases.

Thus, any mounted in vibrating piston pumps check valves must be practically not sensitive to abrasive wear of details and to viscosity of pumpable fluid media.

However, available data point that this problem is present until now. So, known check valve for vibrating piston pump (see, for example, SU 1350384), which is nearest to proposed below check valve technically, comprises of: an axisymmetric bowl-shaped housing which includes a side-wall and a bottom and serves as part of the pump housing and an inlet chamber of respective vibrating piston pump, a rigid axisymmetric seat (as this seat serves central part of said bottom) which equipped with at least one inlet or, preferable, a few inlets for intake of fluid medium (these inlets are spaced at practically equal angular distances about the symmetry axis of said housing), an at least one fastened to the housing axisymmetric closure at least part of which, that is meant for opening/closing of the inlet, is made from resilient material. The known closure is formed as a round washer, central part of which is fastened to the housing bottom by suitable means (for example, by a screw-nut). Described check valve is simplest in design and easy produced. Therefore, most of available for sale vibrating piston pumps are equipped with such valves.

Unfortunately, operating reliability of described check valve decreases as abrasive wear of the peripheral part of said washer-closure and the seat increases. Moreover, known check valve characterised in that the total open flow area of the inlets is always less substantially than area of the resilient part of said washer-closure. It has an especially negative influence upon pump productivity at pumping of viscous fluid media.

Brief Description of the Invention

The invention is based on the problem of creation (by change of closure form and position of closure and seat within valve housing) substantially more productive and service-strong check valve for vibrating piston pump.

This problem is solved in that in a check valve for vibrating piston pump comprising: an axisymmetric bowl-shaped housing which includes a side-wall and a bottom and serves as the pump housiηg part and inlet chamber of said pump, an at least one rigid axisymmetric seat equipped with at least one inlet for intake of fluid medium, and an at least one fastened to the housing axisymmetric closure, at least part of which meant for opening/closing of the inlet is made from a resilient material, according to the invention the closure is formed as a ring-like element and consists of a peripheral part, which is fastened to the side-wall of said housing, and a resilient part, which is located near said side- wall, and such part of said housing, that is remote from its symmetry axis, serves as the seat.

Such closure form and such seat position allow multiplying substantially relationship of total inlets' open flow area to the closure resilient part area of any particular embodiment of the invention. In this way productivity and operating reliability of vibrating piston pumps will be increasing even at pumping of viscous fluid media containing abrasive particles. First additional feature consists in that - the closure is formed as a flat ring-like element, the peripheral part of such closure is directly fastened in said side-wall of said housing, the resilient part of such closure is abutting upon the peripheral area of the bottom of said housing, and said peripheral area of said bottom serves as the seat and is equipped with at least two inlets, which are spaced at practically equal angular distances.

The inlets into such check valve can be formed as wide slits, which are located near the housing side-wall. It facilitate opening the inlets and intake of viscous fluid medium into inlet ' chamber and closing the inlets at the time of transfer of portions of this fluid medium into the discharge chamber of the vibrating piston pump. Second additional feature consists in that - the housing is sectionalised and comprises of: an oblong ring-like element that serves as the side-wall, a removable ring-like washer having a ledge that is directed into the housing radially, the removable bottom, upper flank of which directed to said washer is confined by cone-shaped surface on its peripheral area and by plane on its middle area, at that said middle area serves as the seat; the closure is formed as flat ring-like element having a peripheral groove, in which said washer's ledge is inserted, and said washer together with said closure is fastened to the lower flank of said side-wall.

In this case, the inlet is shaped as wide single ring-like slit that allows to pump viscous fluid media containing abrasive particles still more effectively.

Third additional feature consists in that the closure resilient part is formed as a cylindrical thimble having height below the side-wall height, and this side-wall is equipped with the inlets and serves as the seat. This design allows multiplying total open flow area of the inlets and to increase productivity of vibrating piston pump substantially.

Next, fourth additional feature consists in that said closure peripheral part is formed as a ring-like shoulder, which is fastened in upper part of the housing's side-wall. Fifth additional feature consists in that - the resilient part of the closure is formed as a ring-like in a plan and mushroom-like in any transversal section detail that is fastened in middle part of the side-wall of the housing, said part of the side-wall serves as the seat, and the inlets are notched in said seat at least in two rows and located bilaterally symmetric in respect of fastening area of said resilient part of the closure.

Such check valves is especially effective as components of at least two-stage vibrating piston pumps which are meant for pumping of Newtonian liquids. Further, sixth additional feature consists in that the middle part of said detail is equipped on the inside with a ring-like groove. It facilitates lipping of said detail edges during each intake and their adjacency to the inlets at every pump piston stroke towards the inlet chamber. Seventh additional feature consists in that — the check valve is equipped with two seats and two closures, at that one of two seat is located on peripheral part of the housing bottom, and a part of the housing side-wall serves as the second seat.

Each coupled check valve may provide intake of fluid medium both from the bottom side and from side-wall of bowl-shaped housing. This advantage is especially important when one of two intake directions will be blocked temporarily (for example, if the pump bottom will be contacted with a hole filter bottom, or if the housing side-wall will be contacted with casings of any draw-well or mining hole).

Last additional feature consists in that relationship the total inlets' open flow area in the seat to the area of resilient part of respective closure is selected in the range from 0,3 to 0,95 for each pair «the seat - the closures. It allows specifying suitable productivity of pumping taking into consideration properties of fluid media.

It is clear for each person skilled in the art that - particular form of check valves may consist of arbitrary combinations of the basic subject matter of the invention with said additional features, the invention, as it is defined in claims, may be further supplemented and/or specified using common technical knowledge, and described below preferable embodiments in no way limit the measure of rights.

Brief Description of the Drawings

The invention will now be explained by detailed description of the structure and the operation of check valve with reference to the accompanying drawings, in which: Fig.1 shows a simplest check valve (longitudinal section by symmetry plane consisted view of a part of a discharge chamber of a vibrating piston pump; initial position);

Fig.2 shows the same as Fig.1 (phase «pumping - intake» when said valve is «open»); Fig.3 shows the same as Fig.1 (phase «transfer of part of fluid medium from the inlet chamber into the discharge chamber* when said valve is «closed»);

Fig.4 shows a check valve having sectionalised housing (longitudinal section by symmetry plane consisted view of a part of a discharge chamber of a vibrating piston pump, initial position); Fig.5 shows a check valve in which the closure is formed as a resilient cylindrical thimble having a ring-like shoulder (simplified longitudinal section by symmetry plane consisted view of a part of a discharge chamber of a vibrating piston pump, initial position);

Fig.6 shows the same as Fig.5 (phase «pumping - intake» when said valve is «open»); Fig.7 shows a check valve in which the closure is formed as a resilient ring-like in a plan and mushroom-like in the transversal section detail (the simplified longitudinal section by symmetry plane consisted view of a part of a discharge chamber of a vibrating piston pump, initial position).

Best Embodiments of the Invention

Any check valve according to the invention (see the Figs 1-7) comprises of: an axisymmetric bowl-shaped housing 1 including a side-wall 2 and a bottom 3; this housing 1 is a part of a vibrating piston pump housing and an inlet chamber of such pump, at least one rigid axisymmetric seat 4 having at least one inlet 5 for intake of fluid medium, and at least one axisymmetric ring-like closure 6. Any embodiment of the invention characterised in that the seat 4 is represented as such part of the housing 1 , which is remote from its symmetry axis.

It is preferable in most cases if the seat 4 is equipped with two or more inlets 5, and they are formed as rounded along the edges (in particular, arched) slits.

Any closure 6 consists of a peripheral (as a rule, rigid) part 7, which is fastened to the side- wall 2 of the housing 1 , and a resilient part 8. This part 8 is meant for opening/closing of the inlets 5 in the seat 4 and located near said side-wall 2 or adjoined to it.

Total open flow area of ail inlets 5 in the seat 4 is selected in the range from 0,3 to 0,95 of the resilient part 8 open area of the closure 6 for every pair «the seat 4 - the closure 6».

Particular embodiments of the invention characterised in that the closures 6 have various geometrical forms and the seats 4 are positioned in the bowl-shaped housing 1 variously.

So, the closure 6 in the simplest check valve (see Figs 1-3) is formed as a flat ring-like element. Peripheral part 7 of this element is directly fastened to the side-wall 2 of the housing 1 , and its resilient part 8 is abutting upon the peripheral area of the bottom 3 of said housing 1. Said peripheral area of the bottom 3 serves as the seat 4, in which at least two inlets 5 are spaced at practically equal angular distances.

Other embodiment of the invention (see Fig.4) characterised in that the housing 1 is sectionalised and contains an oblong ring-like element that serves as the side-wall 2, a removable ring-like washer 9 having a not signed especially ledge that is directed into the housing 1 radially, and removable bottom 3. Directed to said washer 9 upper flank of said bottom

3 is confined by cone-shaped surface on its peripheral area and by plane on its middle area. Said middle area of the removable bottom 3 serves as the seat 4. The closure 6 is formed as flat ring-like element having a peripheral groove, in which said washer's 9 ledge is inserted. Said washer 9 together with said closure 6 is fastened to the lower flank of said side-wall 2 of the sectionalised housing 1.

Next embodiment of the invention (see Figs 5 and 6) characterised in that the resilient part 8 of the closure 6 is formed as a cylindrical thimble. The height of this thimble is less of height of side-wall 2 of the housing 1. Considerable part of said side-wall 2 serves as the seat 4 and is equipped with the inlets 5. The peripheral part 7 of such closure 6 is formed usually as ring-like shoulder fastened in upper part of the side-wall 2 of the housing 1.

Further embodiment of the invention (see Fig.7) characterised in that the resilient part 8 of the closure 6 is formed as ring-like in a plan and mushroom-like in the each transversal section detail. This detail is equipped usually with such peripheral parts 7 as not signed especially set of radial ledges, which are mushroom-like in their transversal section and fixed in the stepped holes in middle part of the side-wall 2 of the housing 1. Part of the side-wall 2, which is overlapped by flexible edges of said detail, is equipped with at least two rows of the inlets 5 and serves as the seat 4. Said rows of the inlets 5 are located bilaterally symmetric in respect of fastening area of said resilient part 8 of the closure 6 (i.e. in respect of row of their peripheral parts 7). It is desirably, if the middle part of said detail (i.e. the resilient part 8) is equipped on the inside with a not signed especially ring-like groove.

And, finally, some check valves according to the invention may be equipped with two seats

4 and two closures 6. First possible variant of such check valve comprises of: the first bottom seat 4 and the first flat ring-like closure 6 according to Figs 1-3, and the second seat 4, which is a part of the side-wall 2, and the second closure 6, the resilient part 8 of which is formed as said cylindrical thimble, according to Figs 5 and 6.

Next possible variant of such check valve comprises of: the first bottom seat 4 and the first flat ring-like closure 6 according to Figs 1-3, and the second seat 4, which is a part of the side-wall 2 also, and the second closure 6, the resilient part 8 of which is formed as ring-like in a plan and mushroom-like in each transversal section detail, according to Fig.7.

One more possible variants of such check valves comprise of: • the first seat 4 and the first closure 6 according to Fig.4, and the second seat 4 and the second closure 6, which are shown either on Figs 5 and 6, or on Fig.7. These (and other possible) variants of check valves of "double action" are not shown especially because they are understandable for persons skilled in art.

But some features of vibrating piston pump, which are needed in order to explain process of pumping, are shown additionally on drawings. These features are: a ring-like partition 10 having a central hole (this partition 10 divides a housing of each usual vibrating piston pump into an inlet chamber and a discharge chamber), , a piston-rod 11 , which is connected to not shown here vibrodrive, and a coaxially fastened on piston-rod 11 a piston 12 having flexible peripheral part. Moreover, curved arrows indicate directions of pumpable fluid medium motion, and straight arrows indicate directions of reciprocal motion of the piston-rod 11 and the piston 12. The described above check valve operates as follows.

In initial position (see Fig.1) flexible peripheral part of the piston 12 adjoins to the ring-like partition 10, blocks its central hole closely and separates the inlet chamber of the vibrating piston pump from its discharge chamber. At the same time the resilient part 8 of the closure 6 is, as a rule, slightly elevated over the seat 4. Therefore, the inlets 5 are slightly-opened. When the piston-rod 11 moves upward (see Fig.2) - the piston 12 pushes out from the discharge chamber a portion of pumpable fluid medium into a not shown here delivery pipe, and flexible peripheral part of said piston 12 bends downward under pressure of fluid medium residue in the discharge chamber and closes the hole in the ring-like partition 10.

At the same time, said piston 12 stroke generates depression within the inlet chamber of pump. As a result the resilient part 8 of closure 6 moves away from the bottom seat 4, and portion of fluid medium passes through the open inlets 5 into said inlet chamber.

When the piston-rod 11 moves downward (see Fig.3) - pressure in the inlet chamber increases, the resilient part 8 of the closure 6 goes up the bottom seat 4 and closes the inlets 5, flexible peripheral part of the piston 12 bends upwards and away from ring-like partition 10 under pressure of fluid medium being in the inlet chamber and opens a ring-like slit, and a portion of fluid medium passes through said slit from the inlet chamber into the discharge chamber of the vibrating piston pump.

Then the pumping/intake process repeats as described above.

The check valve shown on Fig.4 operates, in general, as described above. The difference consists in that fluid medium passes into the bowl-shaped housing 1 through one ring-like inlet 5 between the peripheral area of the bottom 3 and lower flank of said housing 1. The check valve shown on Figs 5 and 6 operates, in general, as described above. The differences consist in that - in initial position (see Fig.5) the lower part of the cylindrical thimble (which serves as the resilient part 8 of the closure 6) adjoins to such part of the side-wall 2, which serves as the seat 4, not hermetically, and when the piston-rod 11 moves upward (see Fig.6), that correlates with phase of pumping/intake, said cylindrical thimble lower part bulges out inward said inlet chamber and opens the inlet 5 in the seat 4.

It is clear, that not shown especially motion of the piston-rod 11 downward forces said cylindrical thimble lower part to adjoin to the seat 4 hermetically and to close the inlets 5.

The check valve shown on Fig.7 operates, in general, as the check valve shown on the Figs 5 and 6. The difference consists in that the upper and lower parts of the ring-like in a plan and mushroom-like in the transversal section detail (i.e. resilient part 8 of the closure 6) bulge out from the seat 4 and adjoin to it in each pumping/intake cycle.

The presented above descriptions of operation of single check valves are sufficient in order to understand operation of any coupled check valve.

Note. It is clear that terms «upward», «downward», «upper» and «lower» are used above according to the drawings of check valves only and do not associated with any real position of any vibrating piston pump in a draw-well or a mining hole.

Industrial Applicability

Any check valve according to the invention can be made easily from accessible materials and used for equipment of such vibrating piston pumps those are meant for highly productive pumping of arbitrary fluid media on a liquid basis (and, especially, viscous media and/or media included abrasive particles).

Claims

1. Check valve for vibrating piston pump comprising - an axisymmetric bowl-shaped housing (1) which includes a side-wall (2) and a bottom (3) and serves as the pump housing part and inlet chamber of said pump, an at least one rigid axisymmetric seat (4) equipped with at least one inlet (5) for intake of fluid medium, and an at least one fastened to the housing (1 ) axisymmetric closure (6), at least part of which meant for opening/closing of the inlet (5) is made from a resilient material, characterised in that the closure (6) is formed as a ring-like element and consists of a peripheral part (7) which is fastened to the side-wall (2) of said housing (1 ), and a resilient part (8) which is located near said side-wall (2), and such part of said housing (1 ), that is remote from its symmetry axis, serves as the seat (4).

2. Check valve of claim 1 characterised in that - the closure (6) is formed as a flat ring-like element, the peripheral part (7) of such closure (6) is directly fastened in said side-wall (2) of said housing (1 ), the resilient part (8) of such closure (6) is abutting upon the peripheral area of the bottom (3) of said housing (1 ), and said peripheral area of the bottom (3) serves as the seat (4) and is equipped with at least two inlets (5), which are spaced at practically equal angular distances.

3. Check valve of claim 1 characterised in that — the housing (1 ) is sectionalised and comprises of: an oblong ring-like element that serves as the side-wall (2), a removable ring-like washer (9) having a ledge that is directed into the housing (1) radially, the removable bottom (3), upper flank of which directed to said washer (9) is confined by cone-shaped surface on its peripheral area and by plane on its middle area, at that said middle area serves as the seat (4); the closure (6) is formed as flat ring-like element having a peripheral groove, in which said washer's (9) ledge is inserted, and said washer (9) together with said closure (6) is fastened to the lower flank of said side- wall (2).

4. Check valve of claim 1 characterised in that the resilient part (8) of the closure (6) is formed as a cylindrical thimble having height below the side-wall (2) height, and this side-wall (2) is equipped with the inlets (5) and serves as the seat (4).

5. Check valve of claim 4 characterised in that said peripheral part (7) of the closure (6) is formed as a ring-like shoulder, which is fastened in upper part of the side-wall (2).

6. Check valve of claim 1 characterised in that - the resilient part (8) of the closure (6) is formed as a ring-like in a plan and mushroom-like in any transversal section detail that is fastened in middle part of the side-wall (2) of the housing (1), said part of the side-wall (2) serves as the seat (4), and the inlets (5) are notched in said seat (4) at least in two rows and located bilaterally symmetric in respect of fastening area of said resilient part (8) of the closure (6).

7. Check valve of claim 6 characterised in that the middle part of said detail is equipped on the inside with a ring-like groove.

8. Check valve of claim 1 characterised in that - it is equipped with two seats (4) and two closures (6), at that one of two seat (4) is located on peripheral part of the bottom (3), and a part of side-wall (2) serves as the second seat (4).

9. Check valve of claim 1 or of claim 8 characterised in that relationship of the total inlets'

(5) open flow area in the seat (4) to the area of resilient part (8) of the respective closure (6) is selected in the range from 0,3 to 0,95 for every pair «seat (4) - closure (6)».