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

FIELD: manufacture of pumps; pumps used for pumping formation fluid out of wells; oil producing industry. SUBSTANCE: centrifugal multi-stage impeller includes drive disk with impeller blades located on its lower surface. First part of upper surface of disk whose outer radius is lesser than outer radius of impeller drive disk is flat in shape. Second part of upper surface of drive disk is made in form of shoulder located over periphery of drive disk. Distance between surface of shoulder and plane where first part of upper surface of drive disk lies reduces from periphery of impeller to point of conjugation of first and second parts of drive disk surface. Shoulder is provided with fins; radius of location of lateral surfaces of these fins is lesser than outer radius of drive disk. Upper end surfaces of fins lie in plane where first part of upper surface of impeller drive disk lies. Novelty of invention consists in reduced turbulence of main flow of liquid which enhances efficiency at simultaneous enhanced efficiency of gas crushing. EFFECT: enhanced efficiency of crushing gas inclusions. 2 cl, 3 dwg