STAGE OF SUBMERSIBLE MULTISTAGE CENTRIFUGAL PUMP Russian patent published in 2003 - IPC

FIELD: oil producing industry; hydraulic machine building. SUBSTANCE: invention is designed for use in centrifugal pumps lifting oil from wells with high content of gas in formation fluid. Proposed pump stage contains guide vane assembly and impeller with driving and driven disks and blades fitted in between. Radially orientated projections separated from each other are made on upper surface of driving disk of impeller. Side surfaces of projections are arranged at other than zero angle to radius of driving disk passing through this projection. Projections are arranged over circumference of driving disk at approximately equal distance from each other, being made for playing the part of additional blades of impeller. Invention is aimed at improving stability of stage operating characteristics when handling two-or without affecting strength and reliability of stage. EFFECT: increased efficiency. 12 cl, 10 dwg