Submersible pump utilizing magnetic clutch activated impeller
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04D-029/00
출원번호
US-0115856
(2011-05-25)
등록번호
US-8721267
(2014-05-13)
발명자
/ 주소
Moss, Robert A.
Baillargeon, Jeremy R.
Tessitore, Joseph
출원인 / 주소
Veeder-Root Company
대리인 / 주소
Nelson Mullins Riley & Scarborough LLP
인용정보
피인용 횟수 :
1인용 특허 :
16
초록▼
A pumping apparatus comprises a rotatable shaft coupled to a motor. At least one control structure is mounted on the shaft, and at least one impeller is carried by the shaft. The impeller is adapted to rotate independently of the shaft so as to pump a fluid. The apparatus also comprises a magnetic c
A pumping apparatus comprises a rotatable shaft coupled to a motor. At least one control structure is mounted on the shaft, and at least one impeller is carried by the shaft. The impeller is adapted to rotate independently of the shaft so as to pump a fluid. The apparatus also comprises a magnetic coupling between the control structure and the impeller. Further, the impeller is adapted to translate axially along the shaft in response to a change in downstream pressure to alter the strength of the magnetic coupling.
대표청구항▼
1. A pumping apparatus comprising a pump housing disposed in a storage tank and in fluid communication with fluid piping, said pumping apparatus comprising: a rotatable shaft;at least one magnetic clutch assembly coupled with said shaft and configured to pump fluid from said storage tank through sai
1. A pumping apparatus comprising a pump housing disposed in a storage tank and in fluid communication with fluid piping, said pumping apparatus comprising: a rotatable shaft;at least one magnetic clutch assembly coupled with said shaft and configured to pump fluid from said storage tank through said pump housing to said fluid piping, said at least one magnetic clutch assembly comprising: an impeller;a control structure;a magnetic coupling between said impeller and said control structure, said magnetic coupling defined by a conductive portion and a plurality of magnets proximate said conductive portion such that rotation of said control structure causes rotation of said impeller;wherein said impeller is configured to travel along said shaft relative to said control structure in response to a change in downstream pressure. 2. The pumping apparatus of claim 1, wherein said at least one magnetic clutch assembly comprises more than one magnetic clutch assembly. 3. The pumping apparatus of claim 1, wherein the torque imparted by said control structure to said impeller is related to the flux density of the magnetic field applied by said plurality of magnets to said conductive portion. 4. The pumping apparatus of claim 1, wherein said impeller comprises said conductive portion and said control structure comprises said plurality of magnets. 5. The pumping apparatus of claim 4, wherein said impeller travels along said shaft toward said control structure in response to an increase in downstream pressure. 6. The pumping apparatus of claim 1, further comprising a diffuser downstream of said impeller to direct said pumped fluid axially. 7. The pumping apparatus of claim 6, wherein said diffuser is coupled with said impeller and configured to travel along said shaft. 8. The pumping apparatus of claim 6, further comprising a thrust bearing disposed between said diffuser and said impeller to allow said impeller to rotate relative to said diffuser. 9. The pumping apparatus of claim 6, further comprising a support structure mounted to said pump housing, said support structure coupled with said diffuser. 10. The pumping apparatus of claim 9, wherein said diffuser is coupled with said support structure via at least one spring-loaded guide pin. 11. A pumping apparatus comprising: a rotatable shaft coupled to a motor;at least one control structure mounted on said shaft;at least one impeller carried by said shaft, wherein said impeller is adapted to rotate independently of said shaft so as to pump a fluid; anda magnetic coupling between said control structure and said impeller;wherein said impeller is adapted to translate axially along said shaft in response to a change in downstream pressure to alter the strength of said magnetic coupling. 12. The apparatus of claim 11, further comprising at least one compression spring disposed along said shaft between said control structure and said impeller, said spring having a preload. 13. The apparatus of claim 12, wherein the magnitude of said preload is selected to cause said spring to resist compression until said downstream pressure reaches a predetermined pressure. 14. The apparatus of claim 11, wherein said control structure is upstream of said impeller. 15. The apparatus of claim 11, wherein said magnetic coupling comprises an array of magnets coupled with said control structure and a conductive ring coupled with said impeller. 16. The apparatus of claim 15, wherein said conductive ring is carried by a steel cylinder attached to a peripheral edge of said impeller. 17. The apparatus of claim 11, wherein the rotational speed of said impeller differs from the rotational speed of said control structure. 18. The apparatus of claim 11, further comprising a sleeve received over at least a portion of said shaft, said sleeve being formed of a low friction material. 19. The apparatus of claim 18, further comprising a bearing interposed between said impeller and said sleeve to allow axial translation of said impeller along said shaft so as to facilitate axial movement of said impeller. 20. A method for pumping fluid from a storage tank to fluid piping, said method comprising the steps of: providing a pump housing having an inlet in fluid communication with said fluid and an outlet in fluid communication with said fluid piping;providing a rotatable shaft located inside said housing, said shaft being in operative communication with a motor;coupling an impeller with said shaft, said coupling allowing said impeller to rotate independently of and translate axially along said shaft;mounting a control structure on said shaft such that said control structure rotates with said shaft;magnetically coupling said control structure with said impeller;rotating said control structure to draw said fluid into said inlet using said impeller; andaltering the strength of said magnetic coupling between said control structure and said impeller in response to a change in downstream pressure. 21. The method of claim 20, wherein said alteration of the strength of said magnetic coupling is caused by axial translation of said impeller relative to said control structure. 22. The method of claim 21, further comprising affixing a sleeve formed of low friction material over at least a portion of said shaft. 23. The method of claim 22, further comprising providing a bearing between said impeller and said sleeve to allow axial translation of said impeller along said shaft. 24. The method of claim 23, wherein said axial translation occurs at a predetermined pressure. 25. The method of claim 23, further comprising mounting a preloaded compression spring between said impeller and said control structure. 26. The method of claim 20, wherein said magnetic coupling step further comprises providing an array of magnets on said control structure. 27. The method of claim 20, further comprising reducing the rotational speed of said impeller relative to that of said control structure in response to an increase in downstream pressure.
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