IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0411029
(2009-03-25)
|
등록번호 |
US-8221070
(2012-07-17)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Reinhart Boerner Van Deuren P.C.
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
10 |
초록
▼
An impeller for a centrifugal pump that includes a disk-shaped shroud having a central axis, a front surface, a rear surface, and a circular perimeter, and a hub at the center of the shroud, the hub having an axial bore. The impeller further includes a first set of vanes on the front surface of the
An impeller for a centrifugal pump that includes a disk-shaped shroud having a central axis, a front surface, a rear surface, and a circular perimeter, and a hub at the center of the shroud, the hub having an axial bore. The impeller further includes a first set of vanes on the front surface of the shroud, the first set of vanes extending radially inward from the perimeter towards the hub, a second set of vanes on the rear surface of the shroud, the second set of vanes extending radially inward from the perimeter towards the hub, a balancing area on the rear surface of the shroud, the balancing area extending radially outward from the hub, and a number of openings in the shroud, the number of openings configured to allow a fluid to pass from one side of the shroud to the other.
대표청구항
▼
1. An impeller for a centrifugal pump comprising: a disk-shaped shroud having a central axis, a front surface, a rear surface, and a circular perimeter;a hub at the center of the shroud, the hub having an axial bore;a first plurality of vanes on the front surface of the shroud, the first plurality o
1. An impeller for a centrifugal pump comprising: a disk-shaped shroud having a central axis, a front surface, a rear surface, and a circular perimeter;a hub at the center of the shroud, the hub having an axial bore;a first plurality of vanes on the front surface of the shroud, the first plurality of vanes extending radially inward from the perimeter towards the hub;a second plurality of vanes on the rear surface of the shroud, the second plurality of vanes extending radially inward from the perimeter towards the huba balancing area on the rear surface of the shroud, the balancing area extending radially outward from the hub; anda plurality of openings in the shroud, the plurality of openings configured to allow a fluid to pass from one side of the shroud to the other. 2. The impeller of claim 1, wherein a diameter of the of the balancing area is defined by the inward extension of the second plurality of vanes. 3. The impeller of claim 1, wherein the plurality of openings comprises a plurality of circular openings. 4. The impeller of claim 3, wherein the plurality of circular openings comprises one or more circular openings having a first diameter, and one or more circular openings having a second diameter, wherein the first diameter is different from the second diameter. 5. The impeller of claim 3, wherein the plurality of circular openings is spaced symmetrically around the circumference of the shroud. 6. The impeller of claim 5, wherein at least one circular opening is located between each pair of adjacent vanes of the first plurality of vanes. 7. The impeller of claim 5, wherein the plurality of circular openings comprises a first group and a second group, wherein each circular opening in the first group is located in a first region and each circular opening in the second group is located in a second region, wherein the first region is farther from the axis than the second region. 8. The impeller of claim 7, wherein the number of circular openings in the second group is two thirds the number of circular openings in the first group. 9. The impeller of claim 1, wherein the plurality of openings comprises a plurality of radially-extending slotted openings. 10. The impeller of claim 9, wherein the diameter of the of the balancing area is defined by the inward extension of the slotted openings. 11. The impeller of claim 9, wherein at least one slotted opening is located between each pair of adjacent vanes of the first plurality of vanes. 12. The impeller of claim 9, wherein each of the plurality of radially-extending slotted openings is a curved slotted opening. 13. The impeller of claim 1, wherein each of the first plurality of vanes is curved. 14. The impeller of claim 13, wherein the plurality of vanes is evenly spaced around the circumference of the shroud. 15. The impeller of claim 14, wherein the plurality of vanes comprise a group of long vanes and a group of short vanes. 16. The impeller of claim 15, wherein the long vanes and short vanes are placed in an alternating sequence around the circumference of the shroud. 17. The impeller of claim 1, wherein each of the second plurality of vanes is curved. 18. The impeller of claim 1, wherein each of the first plurality of vanes extends in a direction substantially orthogonal to the front surface of the shroud, and wherein the degree of the extension defines the vane height. 19. The impeller of claim 18, wherein the height of each vane of the first plurality of vanes tapers linearly from a maximum height near the hub to a minimum height at the perimeter. 20. The impeller of claim 1, wherein each of the second plurality of vanes extends in a direction substantially orthogonal to the rear surface of the shroud. 21. The impeller of claim 1, wherein the balancing area, when subjected to a pressure from the fluid, develops a force in an axial direction that opposes another axial force acting on the impeller. 22. A centrifugal pump comprising: a driveshaft configured to be rotated;a pump casing comprising: an inlet;an outlet;and a chamber disposed between the inlet and outlet;an impeller disposed in the pump casing and attached to the driveshaft, the impeller comprising; a circular shroud having an central axis, a front surface, a rear surface, and a circular perimeter;an eye at the center of the shroud, the eye having an axial bore;a first set of vanes on the front surface of the shroud, the first set of vanes extending radially inward from the perimeter towards the hub;a second set of vanes on the rear surface of the shroud, the second set of vanes extending radially inward from the perimeter towards the hub;a balancing region on the rear surface of the shroud, the balancing region extending radially outward from the hub; anda plurality of openings in the shroud, the plurality of openings configured to allow a fluid to pass from one side of the shroud to the other. 23. The centrifugal pump of claim 22, wherein, during pump operation, axial forces on the impeller from plug load at the inlet are opposed by pressure-induced forces resulting from the fluid acting on the balancing region. 24. The centrifugal pump of claim 22, wherein the surface area of the balancing region is defined by the inward extension of the second set of vanes. 25. The centrifugal pump of claim 22, wherein the surface area of the balancing region is defined by the proximity of the plurality of openings to the eye. 26. The centrifugal pump of claim 22, wherein each of the second set of vanes is curved. 27. The centrifugal pump of claim 22, wherein each of the first set of vanes is curved. 28. The centrifugal pump of claim 22, wherein the plurality of openings comprises a plurality of circular openings. 29. The centrifugal pump of claim 22, wherein the plurality of openings comprises a plurality of radially-extending slotted openings. 30. The centrifugal pump of claim 29, wherein each of the plurality of radially-extending slotted openings is a curved radially-extending slotted opening.
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