Modified volute pump casing
First Claim
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1. A centrifugal pump having a casing, inlet, impeller, throat and cutwater, the improvement comprising:
- said casing being of a modified volute configuration having in the upstream portion thereof, from the cutwater towards a point generally 180°
from the cutwater, a flow area which is greater than would be the flow area of a true volute casing in the same upstream casing portion;
the flow area of said casing in the downstream portion thereof, from the throat back upstream towards a point generally 180°
from the cutwater, also being greater than would be the flow area of a true volute casing in the same downstream casing portion; and
the flow area of the casing in the juncture portion of the pump extending from the upstream portion through a point 180°
from the cutwater and to the downstream portion being significantly less than would be the flow area of a true volute casing at said juncture portion.
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Abstract
The specification discloses a centrifugal pump in which radial thrust on the impeller shaft is reduced by employing a modified volute casing in which the casing flow area downstream from the cutwater to a point generally opposite the cutwater is significantly greater than would be the flow area of a true volute casing, the area at a point generally opposite the cutwater being significantly less than the flow area of a true volute casing and the area just upstream of the throat back towards the point opposite the cutwater being significantly greater than would be the flow area of a true volute casing.
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Citations
19 Claims
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1. A centrifugal pump having a casing, inlet, impeller, throat and cutwater, the improvement comprising:
- said casing being of a modified volute configuration having in the upstream portion thereof, from the cutwater towards a point generally 180°
from the cutwater, a flow area which is greater than would be the flow area of a true volute casing in the same upstream casing portion;
the flow area of said casing in the downstream portion thereof, from the throat back upstream towards a point generally 180°
from the cutwater, also being greater than would be the flow area of a true volute casing in the same downstream casing portion; and
the flow area of the casing in the juncture portion of the pump extending from the upstream portion through a point 180°
from the cutwater and to the downstream portion being significantly less than would be the flow area of a true volute casing at said juncture portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- said casing being of a modified volute configuration having in the upstream portion thereof, from the cutwater towards a point generally 180°
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12. In a centrifugal pump having an impeller, a casing, an inlet, a cutwater and a throat, the improvement in said pump comprising:
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said casing being a modified volute casing having a casing flow area which increases sharply from said cutwater to approximately 60% of the throat area at a point approximately 40°
downstream from said cutwater and continues at approximately 60% of said throat area to about 160°
downstream from said cutwater;said casing flow area thereafter decreasing sharply to about 45% of said throat area at a point approximately 190°
downstream from said cutwater; andsaid casing thereafter increasing gradually to about 100% of said throat area at a point approximately 300°
downstream from said cutwater and continuing at approximately 100% of said throat area to said throat.
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13. A centrifugal pump having a casing, inlet, impeller, throat and cutwater, the improvement in said pump comprising:
- said casing being generally of a volute configuration but having modified casing flow areas for reducing radial thrust loading of the impeller, said modified casing flow areas defining, in the upstream portion thereof between the cutwater and a point generally 180°
from said cutwater and through the portion located generally 90°
from the cutwater, a flow area which is greater than would be the flow area of true volute casing in the same upstream casing portion.
- said casing being generally of a volute configuration but having modified casing flow areas for reducing radial thrust loading of the impeller, said modified casing flow areas defining, in the upstream portion thereof between the cutwater and a point generally 180°
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14. A centrifugal pump having a casing, inlet, impeller, throat and cutwater, the improvement in said pump comprising:
- said casing being generally of a volute configuration but having modified casing flow areas for reducing radial thrust loading of the impeller, said modified casing flow areas defining, in the upstream portion thereof between the cutwater and a point generally 180°
from said cutwater, a flow area which is greater than would be the flow area of true volute casing in the same upstream casing portion;
said greater casing flow area increasing relatively rapidly in the upstream portion of the casing as one proceeds from the cutwater until said flow area is approximately 60% of the throat area. - View Dependent Claims (15)
- said casing being generally of a volute configuration but having modified casing flow areas for reducing radial thrust loading of the impeller, said modified casing flow areas defining, in the upstream portion thereof between the cutwater and a point generally 180°
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16. A centrifugal pump having a casing, inlet, impeller, throat and cutwater, the improvement in said pump comprising:
- said casing being generally of a volute configuration but having modified casing flow areas for reducing radial thrust loading of the impeller, said modified casing flow areas defining a restricted flow area which is less than would be the flow area of a true volute in that portion of said casing located approximately 180°
downstream from said cutwater and extending further downstream beyond such point, said restricted flow area including at least a portion which is about 45% of the throat area of the casing. - View Dependent Claims (17)
- said casing being generally of a volute configuration but having modified casing flow areas for reducing radial thrust loading of the impeller, said modified casing flow areas defining a restricted flow area which is less than would be the flow area of a true volute in that portion of said casing located approximately 180°
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18. A centrifugal pump having a casing, inlet, impeller, throat and cutwater, the improvement in said pump comprising:
- said casing having a modified volute configuration with casing flow areas differing from those of a true volute casing for reducing radial thrust loading of the impeller, said modified casing defining a flow area in the downstream portion thereof, between the throat and a point generally 180°
from the cutwater, which is greater than would be the flow area of true volute casing in the same downstream casing portion.
- said casing having a modified volute configuration with casing flow areas differing from those of a true volute casing for reducing radial thrust loading of the impeller, said modified casing defining a flow area in the downstream portion thereof, between the throat and a point generally 180°
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19. A centrifugal pump having a casing, inlet, impeller, throat and cutwater, the improvement in said pump comprising:
- said casing having a modified volute configuration with casing flow areas differing from those of a true volute casing for reducing radial thrust loading of the impeller, said modified casing defining a flow area in the downstream portion thereof, between the throat and a point generally 180°
from the cutwater, which is greater than would be the flow area of true volute casing in the same downstream casing portion;
said casing flow area, at a point approximately 300°
downstream from said cutwater, reaching 100% of throat area and continuing at approximately 100% of said throat area from a point 300°
downstream from said cutwater to said throat.
- said casing having a modified volute configuration with casing flow areas differing from those of a true volute casing for reducing radial thrust loading of the impeller, said modified casing defining a flow area in the downstream portion thereof, between the throat and a point generally 180°
Specification