CENTRIFUGAL MULTI-STAGE PUMP IMPELLER Russian patent published in 2003 - IPC

FIELD: manufacture of pumps; centrifugal pumps for pumping formation fluid, oil for example. SUBSTANCE: centrifugal multi-stage pump impeller includes drive disk with blades mounted on its lower surface. First part of upper surface of disk is flat in shape and its outer radius is lesser than impeller radius. Second part of upper surface of drive disk is made in form of shoulder. Distance between surface of shoulder and plane where first part of upper surface of drive disk lies reduces from periphery of impeller towards point of conjugation of first and second parts of upper surface of drive disk. Found on shoulder are fins whose upper edges lie in plane located below plane where first part of upper surface of drive disk lies. Radius of location of side end surfaces of fins may be lesser than outer radius of drive disk. According to invention, axial load on bearing members of impeller and guide apparatus is reduced simultaneously with reduction of friction losses in pivot of support. EFFECT: enhanced efficiency. 2 cl, 3 dwg