OIL-WELL CENTRIFUGAL ELECTRIC PUMP Russian patent published in 2003 - IPC

FIELD: oil producing industry. SUBSTANCE: invention relates to centrifugal electric pumps designed for operation in wells. Proposed oil-well centrifugal electric pump contains pump with cylindrical housing having ring input and cylindrical input filter, cover with outlet branch pipe, working stages and shaft, and electric motor with rotor, stator and housing in form of sleeve with sealed and shields in bores of which shaft is mounted on bearings, and hermetically sealed cable inlet through end shield in mounting bushing is provided. End shields are pressed to sleeve of electric motor by screw-nut pair, nut being made as threaded axial hole in shaft and screw is made for acting onto end face of one of bearings. Bearings on shaft and in end shield bores are installed for axial displacement to thrust against stop. Steps limiting displacement of bearings are made in bores of end shields from sides pointed to stator. Flexible ring is installed between bearing and step of bore of one of end shields. Groove is made of periphery of one of bearing end shields. Ring input of pump is formed by inlet ports and end bridges made in housing said bridges are forced into said groove being fitted in contact with its end face made in form of conical surface whose apex is pointed to pump axis. Housing is connected with cover by threaded joint. Cover is installed with contact to end face of last stage of pump, and filter is installed inside housing, thrusting against end faces of end shield and first working stage as support of pump stages. Stepped hole is made in end shield to seal electric cable inlet. EFFECT: simplified design and assembling and disassembling of pump, increased efficiency and service life, reduced overall dimensions. 3 dwg