SUBMERSIBLE MULTISTAGE CENTRIFUGAL PUMP Russian patent published in 2003 - IPC

FIELD: oil producing industry. SUBSTANCE: invention relates to pumps designed for lifting liquids from deep wells. Proposed pump has cylindrical housing accommodating pumping stages, each consisting of working wheel with shaft protective bushing installed for axial displacement on shaft, shaft and fixed guide vane assembly. Guide vane assembly is provided with cylindrical beads on end face surfaces and hub inside which pump shaft rotates in protective bushing. Outer cylindrical surface of guide vane assembly is provided with cylindrical grooves accommodating elastic rings. Hub of working wheel, from side of liquid intake, is in tight contact with outer end face of cylindrical head of protective bushing which contacts with end face surface of hub of guide vane assembly through inner ring end face surface of cylindrical head machined with high quality of surface. Outer end face of cylindrical head is provided with spherical groove whose minimum diameter corresponds to diameter of hub of working wheel from side of liquid intake, and maximum diameter corresponds to diameter of hub of guide vane assembly. EFFECT: wear of contact surfaces, and vibrations, improved repairability and increased efficiency of pump. 1 dwg