US20110164997A1 - Pump - Google Patents
Pump Download PDFInfo
- Publication number
- US20110164997A1 US20110164997A1 US12/737,998 US73799809A US2011164997A1 US 20110164997 A1 US20110164997 A1 US 20110164997A1 US 73799809 A US73799809 A US 73799809A US 2011164997 A1 US2011164997 A1 US 2011164997A1
- Authority
- US
- United States
- Prior art keywords
- pump
- shaft
- recess
- impeller
- electric motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
- F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/043—Shafts
Definitions
- a pump in particular a circulating pump, which has an impeller in a pump housing and with which a fluid can be delivered from a pump inlet of the pump housing to a pump outlet of the pump housing.
- a rotor of an electric motor is mechanically coupled to the impeller via a shaft such that, by rotation of the rotor, the impeller can be placed into a corresponding rotating movement.
- the pump cools the rotor of the electric motor.
- Circulating pumps of this type are referred to as high efficiency circulating pumps.
- short-circuit bars of the rotor are manufactured from copper instead of the aluminum which is frequently used.
- these high efficiency circulating pumps have the disadvantage of high costs.
- An aspect is to provide a pump in which the efficiency can be increased in a simpler and more cost-effective manner.
- a pump includes an impeller in a pump housing and with which a fluid can be delivered from a pump inlet of the pump housing to a pump outlet of the pump housing.
- the pump furthermore includes an electric motor, the rotor of which is mechanically coupled to the impeller via a shaft such that, by rotation of the rotor, the impeller can be placed into a corresponding rotating movement.
- cooling of the rotor of the electric motor is provided by a thermosiphon which is arranged in the shaft, the impeller serving as a heat sink for a working medium of the thermosiphon.
- the pump makes use of the fact that better cooling of the rotor in electric motors results in an increase in the efficiency.
- This effect is made use of in the pump and a shaft thermosiphon is inserted in the rotor shaft. Cooling of the shaft also results in cooling of the rotor of the electric motor, thus resulting in the desired increase in efficiency.
- the heat conducted away from the rotor is dispensed via the thermosiphon to the pump wheel which is located in a fluid, for example heating water, the pump wheel being used and designed as a condenser. This has the consequence that heat lost from the rotor of the electric motor is recycled into the fluid circuit. If the latter is, as mentioned, a heating circuit, then the efficiency thereof can also be increased, since heat is supplied to the heating water.
- the pump furthermore has the advantage of being able to be produced more cost-effectively by comparison to the high efficiency circulating pumps known from the related art, since use can be made of known materials, such as short circuit bars of the rotor made from aluminum. Furthermore, however, the efficiency of already optimized high efficiency circulating pumps can also be further increased. Although a smaller increase in efficiency than with conventional circulating pumps should be anticipated owing to the losses from high efficiency circulating pumps already being lower, nevertheless the provision of a thermosiphon in the shaft and the use of the impeller as a heat sink permit a further improvement in the efficiency.
- a recess is provided, the recess extending in the longitudinal direction and in which the working medium circulates owing to a change in the state of aggregation between liquid and gaseous. It is expedient in this case if the recess extends over the entire width of the rotor of the electric motor so that as good an amount of heat as possible can be admitted into the working medium in the thermosiphon. Furthermore, it is also advantageous if the recess is formed in the region of bearings of the electric motor. In addition to the cooling of the rotor, the bearing temperatures are also evened out and reduced at the bearings, thus increasing the service life of these highly stressed wearing parts.
- the shaft has a central section and an end section which is fixedly connected to the central section and to which the impeller is fastened, the recess being of cylindrical design in the central section and the recess being of conical design in the end section.
- the electric motor and at least part of the central section of the shaft are arranged in a fluid tight manner in a housing part, and the end section is arranged outside the housing part.
- the end section and the central section of the shaft are surrounded on the outer circumferential side by a seal which may be arranged outside the housing part, fitting snugly onto a passage opening for the shaft.
- the housing part may be, for example, a motor housing surrounding the electric motor.
- the housing part and the pump housing may be combined with each other. The seal ensures that the fluid conveyed by the impeller cannot come into contact with components of the electric motor, which could result in the destruction thereof.
- a device with spokes extending radially from a central hub is provided in the conical recess of the end section in order to improve the formation of a film of condensate of the working medium on the conical wall of the end section.
- the device may be arranged in the conical recess and is intended to improve the circulation of the working medium in the thermosiphon.
- the ratio of the diameter of the recess, in particular in the central section, to the diameter of the shaft is such that at least a predetermined torque can be transmitted to the impeller.
- thermosiphon is particularly efficient if the wall of the recess is rough. This means that, in particular when making the recesses in the central and end sections of the shaft, the walls do not have to be finished in a particular way. On the contrary, it has been shown that the thermosiphon is most efficient if, after the recess has been made, no further recess machining steps take place. Thus, in addition to a maximum increase in the efficiency, the costs for producing the thermosiphon can be kept low.
- the working medium is placed into the recess under vacuum and, by sealing the recess permanently without any loss.
- a refrigerant in particular water, FC72, R124a, R600a, isobutane, etc., having an evaporation temperature of less than 100° C. is provided as the working medium.
- any refrigerant which has an evaporation temperature which is lower than the heat generated by the rotor of the electric motor is suitable as the working medium.
- an end of the shaft which is outside the housing part and is opposite the end section has a hub which is provided for connection to a fan wheel for cooling the electric motor.
- the additional fan wheel can constitute a further heat sink for the thermosiphon.
- the refinement of the thermosiphon with the impeller as a heat sink renders the provision of a further fan wheel unnecessary.
- the shaft in an installation situation, is mounted horizontally or is mounted in such a manner that, with respect to the direction of gravitational force, the impeller on the end section of the shaft is located higher than the central section of the shaft. Both of these cases ensure that the thermosiphon is capable of functioning in order to reduce the temperature of the rotor of the electric motor. In other differing installation situations, cooling of the rotor can no longer be ensured. Although, then, the efficiency of the pump can no longer be increased, operation of the pump with the conventional efficiency is readily possible.
- the single figure shows a section through a pump used, for example, as a circulating pump in a heating circuit
- the pump which is illustrated in the figure has an impeller 2 which is arranged in a two-part pump housing 1 a, 3 .
- the pump housing 1 a has a pump inlet 1 c, for example, from a heater, which opens into a collecting duct 1 b.
- the collecting duct 1 b extends spirally in the radial direction of the impeller 2 and opens into a pump outlet 1 d of the pump housing 1 a.
- the pump outlet 1 d is connected, for example, to an inlet to a radiator.
- the pump housing 3 is formed integrally with a motor housing 5 and has a passage opening 14 for a shaft 7 which connects the impeller 2 mechanically directly, i.e.
- a seal 4 is provided outside the motor housing 5 in the region of the passage opening 14 .
- the seal 4 fits snugly onto the outer edge of the passage opening 14 and is connected to a disk spring 13 which is arranged on the outer circumferential side of the shaft 7 .
- the shaft 7 is designed in two parts and has a central section 9 a, 9 b (having different diameters merely by way of example) and an end section 10 connected to the central section.
- a recess which is provided with respect to the axis of rotation is formed in the central section 9 a, 9 b and in the end section 10 .
- the recess is of continuous cylindrical design.
- the recess is of conical design.
- the impeller 2 is connected to the end section 10 of the shaft 7 .
- the central section 9 a, 9 b and the end section 10 are connected to each other in such a manner that a working medium which is placed into the recess 8 under vacuum is arranged in the recess permanently without any loss.
- a refrigerant having an evaporation temperature of. e.g., less than 100° C. is provided as the working medium in the recess 8 .
- the refrigerant used may be, for example, water, R124a, R600a, FC72, isobutane, etc.
- thermosiphon which is arranged in the shaft and in which the impeller 2 , which is connected to the shaft, serves as a heat sink for the refrigerant of the thermosiphon.
- the effect achieved by the thermosiphon is cooling of the rotor of the electric motor and of the bearings 15 , 16 thereof. During operation of the electric motor, temperatures of approx. 150° C. to 300° C. are achieved in the vicinity of the rotor, as a result of which the refrigerant provided in the recess 8 begins to evaporate.
- the shaft of the circulating pump is mounted horizontally or is mounted in such a manner that, with respect to the direction of gravitational force, the impeller 2 on the end section 10 of the shaft 7 is located higher than the central section 9 a, 9 b of the shaft, the evaporated refrigerant is forced in the direction of the end section 10 of the shaft 7 because of the rotation of the shaft.
- the impeller 2 is arranged in the fluid, which is at a maximum of 70° C., for example in the case of a heating circuit, and constitutes a condenser of the thermosiphon.
- the evaporated working medium condenses and is pressed onto the wall of the conical recess of the end section 10 because of the rotating shaft 7 .
- the conical design of the recess 8 in the region of the end section 10 ensures that the condensed working medium is pressed in the direction of the central section 9 a, 9 b until the working medium enters, in turn, into the region of the electric motor 6 (and therefore of the heat source) and is evaporated there again.
- the working medium therefore circulates owing to this change in the state of aggregation between liquid and gaseous in the recess 8 of the shaft 7 .
- thermosiphons the circulation of the working medium of the thermosiphon formed in the shaft 7 is not based on capillary forces but rather on the rotational forces which occur in the shaft 7 during operation.
- the exemplary embodiment, which is illustrated in the figure, of the pump has an optional hub 12 which projects with the shaft 7 out of the motor housing 5 and is arranged at that end of the shaft 7 which is opposite the end section.
- the hub 12 serves to accommodate a conventional fan wheel in order optionally to bring about further cooling of the electric motor.
- the ratio of the diameter of the recess 8 , in particular in the central section 9 a, 9 b, to the diameter of the shaft 7 has to be dimensioned in such a manner that at least a predetermined torque can be transmitted to the impeller 2 .
- the shaft 7 has sections of differing diameter and therefore differing wall thicknesses in its central section 9 a, 9 b in order to transmit the required torque.
- This illustration is merely by way of example and is not compulsory. Irrespective of the wall thicknesses of the shaft 7 in different sections of the central section 9 a, 9 b, the bore 8 in the central section 9 a, 9 b has the same diameter continuously, thus ensuring circulation of the working medium in the recess 8 .
- the wall of the recess 8 does not need to be finished. It has turned out on the contrary that the thermosiphon is much more efficient the rougher the wall of the recess 8 is.
- thermosiphon provided in the shaft 7 of the circulating pump can be provided in conventional pumps, for example circulating pumps, and in what are referred to as high efficiency pumps. If a thermosiphon is installed in a conventional pump, pumps having efficiency comparable to the high efficiency pumps can be realized substantially more favorably, since materials which are more cost-effective can be used in the production of the pumps.
- thermosiphon in the shaft of a high efficiency pump results in an improvement in the efficiency there, but the increase in efficiency is smaller than in conventional pumps since high efficiency pumps inherently already have lower losses.
Abstract
A circulating pump with an impeller disposed in a pump housing, by which a fluid can be delivered from a pump inlet of the pump housing to a pump outlet of the pump housing. The circulating pump includes an electric motor, the rotor of which is mechanically coupled to the impeller via a shaft such that that the impeller can be placed into an appropriate rotating movement by rotation of the rotor, and cools the rotor of the electric motor by a thermosiphon in the shaft, wherein the impeller serves as a heat sink for a working medium of the thermosiphon.
Description
- This application is the U.S. national stage of International Application No. PCT/EP2009/059235, filed Jul. 17, 2009 and claims the benefit thereof. The International Application claims the benefits of German Application No. 102008046293.4 filed on Sep. 8, 2008; both applications are incorporated by reference herein in their entirety.
- Described below is a pump, in particular a circulating pump, which has an impeller in a pump housing and with which a fluid can be delivered from a pump inlet of the pump housing to a pump outlet of the pump housing. A rotor of an electric motor is mechanically coupled to the impeller via a shaft such that, by rotation of the rotor, the impeller can be placed into a corresponding rotating movement. Furthermore, the pump cools the rotor of the electric motor.
- In order to increase the efficiency of circulating pumps, it is known to produce the circulating pumps from particularly high-quality materials in order to improve the efficiency thereof. Circulating pumps of this type are referred to as high efficiency circulating pumps. Thus, for example, short-circuit bars of the rotor are manufactured from copper instead of the aluminum which is frequently used. However, these high efficiency circulating pumps have the disadvantage of high costs.
- An aspect is to provide a pump in which the efficiency can be increased in a simpler and more cost-effective manner.
- A pump includes an impeller in a pump housing and with which a fluid can be delivered from a pump inlet of the pump housing to a pump outlet of the pump housing. The pump furthermore includes an electric motor, the rotor of which is mechanically coupled to the impeller via a shaft such that, by rotation of the rotor, the impeller can be placed into a corresponding rotating movement. Furthermore, cooling of the rotor of the electric motor is provided by a thermosiphon which is arranged in the shaft, the impeller serving as a heat sink for a working medium of the thermosiphon.
- The pump makes use of the fact that better cooling of the rotor in electric motors results in an increase in the efficiency. This effect is made use of in the pump and a shaft thermosiphon is inserted in the rotor shaft. Cooling of the shaft also results in cooling of the rotor of the electric motor, thus resulting in the desired increase in efficiency. The heat conducted away from the rotor is dispensed via the thermosiphon to the pump wheel which is located in a fluid, for example heating water, the pump wheel being used and designed as a condenser. This has the consequence that heat lost from the rotor of the electric motor is recycled into the fluid circuit. If the latter is, as mentioned, a heating circuit, then the efficiency thereof can also be increased, since heat is supplied to the heating water.
- The pump furthermore has the advantage of being able to be produced more cost-effectively by comparison to the high efficiency circulating pumps known from the related art, since use can be made of known materials, such as short circuit bars of the rotor made from aluminum. Furthermore, however, the efficiency of already optimized high efficiency circulating pumps can also be further increased. Although a smaller increase in efficiency than with conventional circulating pumps should be anticipated owing to the losses from high efficiency circulating pumps already being lower, nevertheless the provision of a thermosiphon in the shaft and the use of the impeller as a heat sink permit a further improvement in the efficiency.
- According to an advantageous refinement, in order to form the thermosiphon in the shaft, a recess is provided, the recess extending in the longitudinal direction and in which the working medium circulates owing to a change in the state of aggregation between liquid and gaseous. It is expedient in this case if the recess extends over the entire width of the rotor of the electric motor so that as good an amount of heat as possible can be admitted into the working medium in the thermosiphon. Furthermore, it is also advantageous if the recess is formed in the region of bearings of the electric motor. In addition to the cooling of the rotor, the bearing temperatures are also evened out and reduced at the bearings, thus increasing the service life of these highly stressed wearing parts.
- In one refinement, the shaft has a central section and an end section which is fixedly connected to the central section and to which the impeller is fastened, the recess being of cylindrical design in the central section and the recess being of conical design in the end section. This refinement ensures the circulation of the working medium which has different states of aggregation during the operation of the pump. In contrast to known thermosiphons, the circulation of the working medium is not made possible by capillary forces but rather by rotational forces. For this purpose, the conical design of the recess in the end section of the shaft is necessary in order to press condensed working medium back in the direction of the rotor of the electric motor.
- In one specific refinement, the electric motor and at least part of the central section of the shaft are arranged in a fluid tight manner in a housing part, and the end section is arranged outside the housing part. In particular, the end section and the central section of the shaft are surrounded on the outer circumferential side by a seal which may be arranged outside the housing part, fitting snugly onto a passage opening for the shaft. The housing part may be, for example, a motor housing surrounding the electric motor. In a practical refinement, the housing part and the pump housing may be combined with each other. The seal ensures that the fluid conveyed by the impeller cannot come into contact with components of the electric motor, which could result in the destruction thereof.
- According to a further refinement, a device with spokes extending radially from a central hub is provided in the conical recess of the end section in order to improve the formation of a film of condensate of the working medium on the conical wall of the end section. The device may be arranged in the conical recess and is intended to improve the circulation of the working medium in the thermosiphon.
- It is furthermore expedient if the ratio of the diameter of the recess, in particular in the central section, to the diameter of the shaft is such that at least a predetermined torque can be transmitted to the impeller. By the provision of a recess in the shaft, the torque which can be transmitted by the electric motor to the impeller is reduced. In this structural refinement of the thermosiphon, care should therefore be taken to ensure that a torque which is not less than necessary can still be transmitted by the shaft to the impeller. The provision of the thermosiphon in the shaft may possibly result in the diameter of the shaft having to be increased in order still to be able to meet the necessary operating parameters of the pump.
- It has furthermore been shown that the thermosiphon is particularly efficient if the wall of the recess is rough. This means that, in particular when making the recesses in the central and end sections of the shaft, the walls do not have to be finished in a particular way. On the contrary, it has been shown that the thermosiphon is most efficient if, after the recess has been made, no further recess machining steps take place. Thus, in addition to a maximum increase in the efficiency, the costs for producing the thermosiphon can be kept low.
- It is furthermore expedient if the working medium is placed into the recess under vacuum and, by sealing the recess permanently without any loss. A refrigerant, in particular water, FC72, R124a, R600a, isobutane, etc., having an evaporation temperature of less than 100° C. is provided as the working medium. In principle, any refrigerant which has an evaporation temperature which is lower than the heat generated by the rotor of the electric motor is suitable as the working medium.
- In a further refinement, an end of the shaft which is outside the housing part and is opposite the end section has a hub which is provided for connection to a fan wheel for cooling the electric motor. The additional fan wheel can constitute a further heat sink for the thermosiphon. In principle, however, the refinement of the thermosiphon with the impeller as a heat sink renders the provision of a further fan wheel unnecessary.
- According to a further refinement, in an installation situation, the shaft is mounted horizontally or is mounted in such a manner that, with respect to the direction of gravitational force, the impeller on the end section of the shaft is located higher than the central section of the shaft. Both of these cases ensure that the thermosiphon is capable of functioning in order to reduce the temperature of the rotor of the electric motor. In other differing installation situations, cooling of the rotor can no longer be ensured. Although, then, the efficiency of the pump can no longer be increased, operation of the pump with the conventional efficiency is readily possible.
- These and other aspects and advantages will become more apparent and more readily appreciated from the following description of an exemplary embodiment, taken in conjunction with the accompanying drawings of which:
- The single figure shows a section through a pump used, for example, as a circulating pump in a heating circuit
- Reference will now be made in detail to the preferred embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
- The pump which is illustrated in the figure has an
impeller 2 which is arranged in a two-part pump housing 1 a, 3. Thepump housing 1 a has apump inlet 1 c, for example, from a heater, which opens into a collectingduct 1 b. The collectingduct 1 b extends spirally in the radial direction of theimpeller 2 and opens into a pump outlet 1 d of thepump housing 1 a. The pump outlet 1 d is connected, for example, to an inlet to a radiator. In the exemplary embodiment, the pump housing 3 is formed integrally with amotor housing 5 and has apassage opening 14 for a shaft 7 which connects theimpeller 2 mechanically directly, i.e. without an intermediate gear mechanism, to a rotor of anelectric motor 6. Theelectric motor 6 is arranged in themotor housing 5. In order to obtain sealing of the electric components provided in themotor housing 5 from the fluid, for example water, conveyed by theimpeller 2, a seal 4 is provided outside themotor housing 5 in the region of thepassage opening 14. The seal 4 fits snugly onto the outer edge of thepassage opening 14 and is connected to adisk spring 13 which is arranged on the outer circumferential side of the shaft 7. - The shaft 7 is designed in two parts and has a
central section end section 10 connected to the central section. A recess which is provided with respect to the axis of rotation is formed in thecentral section end section 10. In thecentral section end section 10, the recess is of conical design. As can be gathered from the figure, theimpeller 2 is connected to theend section 10 of the shaft 7. Thecentral section end section 10 are connected to each other in such a manner that a working medium which is placed into therecess 8 under vacuum is arranged in the recess permanently without any loss. A refrigerant having an evaporation temperature of. e.g., less than 100° C. is provided as the working medium in therecess 8. The refrigerant used may be, for example, water, R124a, R600a, FC72, isobutane, etc. - The provision of the
recess 8 in the shaft 7 with the described shape of the recess in the central section 9 and in theend section 10 and with the refrigerant being placed into therecess 8 results in the formation of a thermosiphon which is arranged in the shaft and in which theimpeller 2, which is connected to the shaft, serves as a heat sink for the refrigerant of the thermosiphon. The effect achieved by the thermosiphon is cooling of the rotor of the electric motor and of thebearings recess 8 begins to evaporate. In an installation situation in which the shaft of the circulating pump is mounted horizontally or is mounted in such a manner that, with respect to the direction of gravitational force, theimpeller 2 on theend section 10 of the shaft 7 is located higher than thecentral section end section 10 of the shaft 7 because of the rotation of the shaft. Theimpeller 2 is arranged in the fluid, which is at a maximum of 70° C., for example in the case of a heating circuit, and constitutes a condenser of the thermosiphon. - Owing to the lower temperature of the
impeller 2 and the conical configuration of therecess 8 in the region of the end section, the evaporated working medium condenses and is pressed onto the wall of the conical recess of theend section 10 because of the rotating shaft 7. The conical design of therecess 8 in the region of theend section 10 ensures that the condensed working medium is pressed in the direction of thecentral section recess 8 of the shaft 7. Thus, waste heat is transported away from the electric motor and admitted via theimpeller 2 to the fluid which is conveyed by the latter. In contrast to known thermosiphons, the circulation of the working medium of the thermosiphon formed in the shaft 7 is not based on capillary forces but rather on the rotational forces which occur in the shaft 7 during operation. - As a result, the rotor of the
electric motor 6 and thebearings electric motor 6 are thereby cooled, thus resulting in an increase in the efficiency. At the same time, the heat which is lost and is conducted away from theelectric motor 6 can be recycled into the fluid circuit in which theimpeller 2 is located. - The exemplary embodiment, which is illustrated in the figure, of the pump has an
optional hub 12 which projects with the shaft 7 out of themotor housing 5 and is arranged at that end of the shaft 7 which is opposite the end section. Thehub 12 serves to accommodate a conventional fan wheel in order optionally to bring about further cooling of the electric motor. - The ratio of the diameter of the
recess 8, in particular in thecentral section impeller 2. In the exemplary embodiment illustrated, the shaft 7 has sections of differing diameter and therefore differing wall thicknesses in itscentral section central section bore 8 in thecentral section recess 8. - When producing the
recess 8 in the shaft, the wall of therecess 8 does not need to be finished. It has turned out on the contrary that the thermosiphon is much more efficient the rougher the wall of therecess 8 is. However, it is expedient to remove lubricants which may have been introduced into therecess 8 in order to produce the latter, since the lubricants may have a disadvantageous effect on the state of aggregation of the working medium. - The thermosiphon provided in the shaft 7 of the circulating pump can be provided in conventional pumps, for example circulating pumps, and in what are referred to as high efficiency pumps. If a thermosiphon is installed in a conventional pump, pumps having efficiency comparable to the high efficiency pumps can be realized substantially more favorably, since materials which are more cost-effective can be used in the production of the pumps.
- For example, in standard pumps having an asynchronous motor within the range of 10 to 20 kW, an increase in efficiency of 1.5% can be obtained. The provision of a thermosiphon in the shaft of a high efficiency pump also results in an improvement in the efficiency there, but the increase in efficiency is smaller than in conventional pumps since high efficiency pumps inherently already have lower losses.
- A description has been provided with particular reference to preferred embodiments thereof and examples, but it will be understood that variations and modifications can be effected within the spirit and scope of the claims which may include the phrase “at least one of A, B and C” as an alternative expression that means one or more of A, B and C may be used, contrary to the holding in Superguide v. DIRECTV, 358 F3d 870, 69 USPQ2d 1865 (Fed. Cir. 2004).
Claims (15)
1-14. (canceled)
15. A pump, in particular a circulating pump, comprising:
a pump housing having a pump inlet and a pump outlet;
an impeller in said pump housing by which a fluid can be delivered from the pump inlet to the pump outlet;
an electric motor having a rotor mechanically coupled to said impeller via a shaft, whereby rotation of the rotor causes rotation of said impeller; and
a thermosiphon in the shaft, cooling the rotor of the electric motor, said impeller serving as a heat sink for a working medium of said thermosiphon.
16. The pump as claimed in claim 15 , wherein said thermosiphon in the shaft is formed by a recess, extending in a longitudinal direction, in which the working medium circulates owing to a change in state of aggregation between liquid and gaseous.
17. The pump as claimed in claim 16 , wherein the recess extends over an entire width of the rotor of said electric motor.
18. The pump as claimed in claim 17 ,
wherein said electric motor further includes bearings, and
wherein the recess is formed in a region of the bearings of said electric motor.
19. The pump as claimed in claim 18 ,
wherein the shaft has a central section and an end section, fixedly connected to the central section, to which said impeller is fastened, and
wherein the recess includes a cylindrical recess in the central section of the shaft and a conical recess in the end section of the shaft.
20. The pump as claimed in claim 19 ,
further comprising a housing part in which said electric motor and at least part of the central section of the shaft are arranged in a fluid tight manner, and
wherein the end section is formed outside said housing part.
21. The pump as claimed in claim 20 ,
wherein said housing part includes a passage opening for the shaft, and
wherein said pump further comprises a seal, surrounding the end section and the central section of the shaft on an outer circumferential side, arranged outside said housing part and fitting snugly onto the passage opening for the shaft.
22. The pump as claimed in claim 21 , further comprising a device with spokes extending radially from a central hub, provided in the conical recess of the end section of the shaft to improve formation of a film of condensate of the working medium on a conical wall of the end section.
23. The pump as claimed in claim 22 , wherein each of the shaft and the cylindrical recess has a diameter and a ratio of the diameter of the cylindrical recess to the diameter of the shaft provides for at least a predetermined torque to be transmitted to said impeller.
24. The pump as claimed in claim 23 , wherein the shaft has a rough wall bounding the recess.
25. The pump as claimed in claim 24 , wherein the working medium is placed into the recess under vacuum and is maintained in the recess permanently without any loss by said seal.
26. The pump as claimed in claim 25 , wherein the working medium has an evaporation temperature of less than 100° C. and is selected from a group consisting of water, R124a refrigerant, FC72 refrigerant, R600a refrigerant, and isobutane.
27. The pump as claimed in claim 16 , wherein the shaft has an end outside the housing part, opposite the end section, with a hub provided for connection to a fan wheel for cooling the electric motor.
28. The pump as claimed in claim 27 , wherein, in an installation, the shaft is mounted horizontally or is mounted with respect to a direction of gravitational force, said impeller on the end section of the shaft is located higher than the central section of the shaft.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008046293.4 | 2008-09-08 | ||
DE102008046293A DE102008046293A1 (en) | 2008-09-08 | 2008-09-08 | pump |
PCT/EP2009/059235 WO2010025989A1 (en) | 2008-09-08 | 2009-07-17 | Pump |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110164997A1 true US20110164997A1 (en) | 2011-07-07 |
Family
ID=41323417
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/737,998 Abandoned US20110164997A1 (en) | 2008-09-08 | 2009-07-17 | Pump |
Country Status (7)
Country | Link |
---|---|
US (1) | US20110164997A1 (en) |
EP (1) | EP2321536A1 (en) |
CN (1) | CN102149924A (en) |
AU (1) | AU2009289702A1 (en) |
DE (1) | DE102008046293A1 (en) |
RU (1) | RU2479754C2 (en) |
WO (1) | WO2010025989A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102832742A (en) * | 2012-09-18 | 2012-12-19 | 东风汽车股份有限公司 | Mining explosion-proof generator integrated with cooling system |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101865161A (en) * | 2010-05-17 | 2010-10-20 | 张继华 | Thermosyphon sealing and cooling device for submerged pump |
CN102751819A (en) * | 2012-06-18 | 2012-10-24 | 宁波三和壳体模具有限公司 | Novel water cooling structure of water pump motor |
DE102015115841B4 (en) | 2015-09-18 | 2024-04-18 | Schwäbische Hüttenwerke Automotive GmbH | Pump-motor unit with cooling of an electric motor driving the pump by means of leakage fluid |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2601146A (en) * | 1946-01-29 | 1952-06-17 | Hayward Tyler & Co Ltd | Means for reducing heat transfer along shafts |
US2743384A (en) * | 1953-05-12 | 1956-04-24 | Singer Mfg Co | Evaporative cooling systems for electric motors |
US3882335A (en) * | 1972-04-25 | 1975-05-06 | Siemens Ag | Cooling apparatus for the rotor of an electric machine which uses a heat pipe |
US4137472A (en) * | 1974-01-31 | 1979-01-30 | S.B.W. Engineers Limited | Cooling system for electric motors |
US4406959A (en) * | 1980-05-07 | 1983-09-27 | Fujitsu Fanuc Limited | Rotary electric motor |
US4930996A (en) * | 1988-08-23 | 1990-06-05 | Grundfos International A/S | Immersion pump assembly |
US4963778A (en) * | 1986-12-13 | 1990-10-16 | Grundfos International A/S | Frequency converter for controlling a motor |
US5624245A (en) * | 1994-10-26 | 1997-04-29 | Mp Pumps, Inc. | Centrufugal pump with thermally isolated and dynamically air cooled shaft seal assembly |
US6528909B1 (en) * | 1998-01-14 | 2003-03-04 | International Business Machines Corporation | Motor shaft having an integral heat pipe |
US20040056541A1 (en) * | 2000-11-21 | 2004-03-25 | Florian Steinmeyer | Superconducting device with a cooling-unit cold head thermally coupled to a rotating superconductive winding |
US20050255951A1 (en) * | 2002-06-13 | 2005-11-17 | Greenwood David G | Cooled pump pulley |
US20060017335A1 (en) * | 2004-07-20 | 2006-01-26 | Wavecrest Laboratories Llc | Dynamoelectric machine with embedded heat exchanger |
US20070114861A1 (en) * | 2003-05-30 | 2007-05-24 | Siemens Aktiengesellschaft | Rollen and rollenmotoren |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH516251A (en) * | 1969-01-04 | 1971-11-30 | Siemens Ag | Method for cooling a fixed body rotatable about a hollow shaft |
SU802641A1 (en) * | 1978-02-20 | 1981-02-07 | Рижское Высшее Военно-Политическоекраснознаменное Училище Им.Маршала Советского Союза Бирюзова C.C. | Conveyer-type centrifucal pump |
DE7913786U1 (en) * | 1979-05-12 | 1979-08-09 | Sueddeutsche Kuehlerfabrik Julius Fr. Behr Gmbh & Co Kg, 7000 Stuttgart | WARM PIPE |
SU955379A1 (en) * | 1981-01-19 | 1982-08-30 | Могилевский Машиностроительный Институт | Electric machine |
JPH01278822A (en) * | 1988-04-29 | 1989-11-09 | Mazda Motor Corp | Automobile air-conditioning device |
DE3925337A1 (en) * | 1989-07-31 | 1991-02-07 | Loher Ag | Electric motor with housing accommodating stator surrounding rotor - has cooling ducts running axially so gaseous cooling medium under high pressure is fed in closed cooling circuit |
JP2004218460A (en) | 2003-01-10 | 2004-08-05 | Kubota Corp | Heat pipe cooling type submerged motor pump |
CA2456563C (en) * | 2004-01-30 | 2011-12-20 | Pratt & Whitney Canada Corp. | Anti-icing apparatus and method for aero-engine nose cone |
DE102006045178A1 (en) * | 2006-09-25 | 2008-04-03 | Siemens Ag | Electric machine, has winding system arranged in grooves of laminated core of stator, and laminated core of rotor arranged at shaft in torque-proof manner, where shaft is supported in two bearings in bearing flanges at housing |
-
2008
- 2008-09-08 DE DE102008046293A patent/DE102008046293A1/en not_active Withdrawn
-
2009
- 2009-07-17 CN CN2009801348438A patent/CN102149924A/en active Pending
- 2009-07-17 US US12/737,998 patent/US20110164997A1/en not_active Abandoned
- 2009-07-17 RU RU2011113662/06A patent/RU2479754C2/en not_active IP Right Cessation
- 2009-07-17 AU AU2009289702A patent/AU2009289702A1/en not_active Abandoned
- 2009-07-17 WO PCT/EP2009/059235 patent/WO2010025989A1/en active Application Filing
- 2009-07-17 EP EP09780777A patent/EP2321536A1/en not_active Withdrawn
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2601146A (en) * | 1946-01-29 | 1952-06-17 | Hayward Tyler & Co Ltd | Means for reducing heat transfer along shafts |
US2743384A (en) * | 1953-05-12 | 1956-04-24 | Singer Mfg Co | Evaporative cooling systems for electric motors |
US3882335A (en) * | 1972-04-25 | 1975-05-06 | Siemens Ag | Cooling apparatus for the rotor of an electric machine which uses a heat pipe |
US4137472A (en) * | 1974-01-31 | 1979-01-30 | S.B.W. Engineers Limited | Cooling system for electric motors |
US4406959A (en) * | 1980-05-07 | 1983-09-27 | Fujitsu Fanuc Limited | Rotary electric motor |
US4963778A (en) * | 1986-12-13 | 1990-10-16 | Grundfos International A/S | Frequency converter for controlling a motor |
US4930996A (en) * | 1988-08-23 | 1990-06-05 | Grundfos International A/S | Immersion pump assembly |
US5624245A (en) * | 1994-10-26 | 1997-04-29 | Mp Pumps, Inc. | Centrufugal pump with thermally isolated and dynamically air cooled shaft seal assembly |
US6528909B1 (en) * | 1998-01-14 | 2003-03-04 | International Business Machines Corporation | Motor shaft having an integral heat pipe |
US20040056541A1 (en) * | 2000-11-21 | 2004-03-25 | Florian Steinmeyer | Superconducting device with a cooling-unit cold head thermally coupled to a rotating superconductive winding |
US20050255951A1 (en) * | 2002-06-13 | 2005-11-17 | Greenwood David G | Cooled pump pulley |
US20070114861A1 (en) * | 2003-05-30 | 2007-05-24 | Siemens Aktiengesellschaft | Rollen and rollenmotoren |
US20060017335A1 (en) * | 2004-07-20 | 2006-01-26 | Wavecrest Laboratories Llc | Dynamoelectric machine with embedded heat exchanger |
Non-Patent Citations (1)
Title |
---|
Engineering Tool Box, "Torsion of Shafts", Nov 2006 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102832742A (en) * | 2012-09-18 | 2012-12-19 | 东风汽车股份有限公司 | Mining explosion-proof generator integrated with cooling system |
Also Published As
Publication number | Publication date |
---|---|
RU2479754C2 (en) | 2013-04-20 |
DE102008046293A1 (en) | 2010-03-11 |
AU2009289702A1 (en) | 2010-03-11 |
WO2010025989A1 (en) | 2010-03-11 |
EP2321536A1 (en) | 2011-05-18 |
RU2011113662A (en) | 2012-10-20 |
CN102149924A (en) | 2011-08-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9431878B2 (en) | Electric machine with enclosed, autonomous cooling medium circuit | |
US6891290B2 (en) | Fully enclosed type motor with outer fans | |
CN101946091B (en) | Centrifugal compressor assembly and method | |
US7598634B2 (en) | Fan motor | |
CN1981421B (en) | Totally-enclosed fancooled type motor | |
US8061151B2 (en) | Refrigerant compressor | |
EP1453187A2 (en) | Drive unit for electric vehicle | |
US20080278011A1 (en) | Stator assembly for use in a fluid-cooled motor and method of making the same | |
CN110036553A (en) | Motor | |
US11005316B2 (en) | Electrical drive device for a motor vehicle | |
US20110164997A1 (en) | Pump | |
JP6011571B2 (en) | Electric turbo compressor | |
US20160290364A1 (en) | Electric water pump | |
US10560000B2 (en) | Electric motor having a tangential architecture with improved air cooling | |
CA2961893A1 (en) | External fan and drive end housing for an air cooled alternator | |
US10006465B2 (en) | Oil-free water vapor blower | |
JP3741092B2 (en) | Ultra-thin pump and cooling system equipped with it | |
JP2010077827A (en) | Fluid machine | |
KR102052949B1 (en) | double cooling structure of a motor | |
JP4013621B2 (en) | Electric water pump | |
US7500821B2 (en) | Vacuum pump | |
JP5587863B2 (en) | Condenser for heat pump, heat pump, and method for producing condenser for heat pump | |
US20140292121A1 (en) | Vehicle drive assembly comprising cooling by means of a heat-transfer fluid and air | |
KR100316609B1 (en) | Cooling system of motor for pump | |
KR102654663B1 (en) | Outer rotor motor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SIEMENS AKTIENGESELLSCHAFT, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DANOV, VLADIMIR;SCHROETER, ANDREAS;REEL/FRAME:025941/0919 Effective date: 20110211 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |