Impeller for centrifugal pumps
AssigneeIngersoll-Dresser Pump Company
InventorsPaul Cooper, Donald P. Sloteman
Life of this patent
Estimating the term…
Abstract
A cavitation resistant impeller for liquid-conveying centrifugal pumps has a plurality of impeller vanes, each vane having, in combination, a leading inlet edge with a root portion extending upstream of its tip portion; a vane thickness that is greater upstream of the impeller throat than the vane thickness downstream of the impeller throat; and an elliptical nose on the leading inlet edge. The invention can be used in straight-vaned impellers or in Francis-type impellers.
Claims5
In an impeller for liquid-conveying centrifugal pumps having a front shroud member, a rear hub member, a plurality of vanes therebetween having leading inlet edges disposed at the periphery of a circle, and an inlet throat opening between a suction side of one vane and a pressure side of an adjacent vane, means for inhibiting cavitation comprising:
- (a) each vane including:
- (i) a span between said shroud member and said hub member;
- (ii) a leading inlet edge having a root portion extending upstream of a tip portion;
- (iii) said leading inlet edge forming a concave surface beginning at a location between said tip portion and the mid-point of said span, said concave surface extending upstream to said root portion;
- and
- (iv) a vane thickness upstream of said inlet throat opening greater than a vane thickness downstream of said throat opening.
An impeller for liquid-conveying centrifugal pumps comprising:
- (a) a front shroud member;
- (b) a rear hub member spaced from said shroud member;
- (c) a plurality of vanes therebetween having leading inlet edges disposed at the periphery of a circle, each pair of vanes forming an inlet throat opening between a suction side of one vane and a pressure side of an adjacent vane;
- (d) each vane including:
- (i) a span between said shroud member and said hub member;
- (ii) a leading inlet edge having a root portion extending upstream of a tip portion;
- (iii) said leading inlet edge forming a concave surface beginning at a location between said tip portion and the mid-point of said span, said concave surface extending upstream to said root portion;
- (iv) a vane thickness upstream of said throat opening greater than a vane thickness downstream of said throat opening;
- and
- (v) an elliptical nose on said leading inlet edge.
An impeller for liquid-conveying centrifugal pumps comprising:
- (a) a front shroud member;
- (b) a rear hub member spaced from said shroud member;
- (c) a plurality of vanes therebetween having leading inlet edges disposed at the periphery of a circle, each pair of vanes forming an inlet throat opening between a suction side of one vane and a pressure side of an adjacent vane;
- (d) each vane including:
- (i) a span between said shroud member and said hub member;
- (ii) a leading inlet edge having a root portion extending upstream of a tip portion;
- (iii) said leading inlet edge forming a concave surface beginning at a location between said tip portion and the mid-point of said span, said concave surface extending upstream to said root portion;
- and
- (iv) an elliptical nose on said leading inlet edge.
Dependencies are inferred from the claim text.