STAGE OF OIL-WELL MULTI-STAGE CENTRIFUGAL PUMP Russian patent published in 2003 - IPC

FIELD: oil mechanical engineering; multi-stage oil-well pumps for pumping-out formation fluid. SUBSTANCE: stage of multi-stage oilwell centrifugal pump includes guide apparatus; diameter of location of outer edges of blades of this apparatus exceeds diameter of lower disk of guide apparatus; stage also includes impeller with drive disk and blades on it. Diameter of drive disk is lesser than diameter of location of outer edges of blades. Upper surface of peripheral portion of drive disk is provided with shoulder where main fins of impeller are located. Diameter of location of outer edges exceeds diameter of drive disk. Main fins of impeller are made integral with blades in such way that side surface of each main fin of impeller is extension of side surfaces of respective blade. EFFECT: enhanced efficiency, increased pressure head of stage; enhanced dispersion of gas inclusions. 8 cl, 7 dwg