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

FIELD: oil producing industry. SUBSTANCE: invention relates to pump building and it can be used in well pumps for pumping out formation fluid. Pumps stage contains impeller and guide vane assembly. Ribs are located on outer edge of upper surface of impeller driving disk. Upper surface of driving disk in stage section passing through axis of impeller rotation and intersecting upper surface of any rib is separated from lower surface of outer disk installed over guide vane assembly by labyrinth clearance. Width of clearance is approximately uniform over its entire length. Width of clearance is determined as distance from arbitrary point on upper surface of impeller of above-indicated section of stage to indicated arbitrary point to point on outer disk of guide vane assembly. Invention is aimed at improving operating conditions of stage owing to evacuation of wear products and abrasive particles and preventing possibility of wedging of impeller at preservation of efficiency of pump stage. EFFECT: improved conditions of operation of pump. 7 cl, 4 dwg