MODULE-SECTION OF MULTISTAGE SUBMERSIBLE CENTRIFUGAL PUMP Russian patent published in 2002 - IPC

FIELD: oil producing industry; pumps. SUBSTANCE: invention relates to design of centrifugal pumps intended for pumping out formation fluid. Each stage of proposed module-section of multistage submersible centrifugal pump has impeller with driving and driven disks and blades fitted between disks, and guide vane assembly with vanes. In edge of driving disk cutouts are made for each channel for communicating space of each channel with space enclosed between driving disk and following guide vane assembly. Outer diameters of driven disk, driving disk and blades of impeller can be equal. Walls of cutouts in edge of driving disk can be made out- of square relative to driving disk plane. One wall of cutout can start from place of intersection of convex surface of blade with driving disk. EFFECT: increased pressure head at operation at low rates. 5 cl, 3 dwg