US 7,549,837 B2
Impeller for centrifugal pump
Matthew Hackworth, Manvel, Tex. (US); David Eslinger, Collinsville, Tex. (US); and Norwood R. Harrell, Dewey, Tex. (US)
Assigned to Schlumberger Technology Corporation, Sugar Land, Tex. (US)
Filed on Dec. 13, 2006, as Appl. No. 11/638,211.
Claims priority of provisional application 60/863059, filed on Oct. 26, 2006.
Prior Publication US 2008/0101921 A1, May 01, 2008
Int. Cl. F01D 5/04 (2006.01)
U.S. Cl. 415—120  [416/186 R; 416/228] 12 Claims
OG exemplary drawing
 
1. A centrifugal pump, comprising:
a rotatable shaft; and
at lest one impeller attached to the rotatable shaft, wherein the at least one impeller includes a top plate having an inner edge and an outer edge, and a bottom plate, and a plurality of vanes enclosed between the top plate and the bottom plate, wherein at least one of the plurality of vanes has a trailing end that comprises a first surface passing over the inner edge of the top plate and adjoining the top plate substantially at the outer edge of the top plate and a second surface that is substantially flush with an axially outward surface of the bottom plate, wherein the first surface and the second surface are not perpendicular to each other.