MULTISTAGE SUBMERSIBLE CENTRIFUGAL PUMP (VERSIONS) Russian patent published in 2007 - IPC F04D13/10 F04D29/20 

FIELD: oil producing industry.

SUBSTANCE: invention relates to multistage submersible centrifugal pumps designed for pumping out formation fluid. Proposed pump contains set of stages assembled on shaft in cylindrical housing. Stages include impellers with necks, driving and driven disks connected by blades, fixed guide-vane assemblies with members forming guide channels. Pump is furnished with partitions installed on bottom of guide channels with slots and radial-thrust bearings provided with races installed on ring base members of guide-vane assemblies and on driven disks on impellers. Impeller fasteners are made in form of pairs of keyways and keys installed separately for each impeller keyways are arranged on driving disks and on shaft of pump, pairs of keyways corresponding to two adjacent impellers are displaced over outer surface of shaft so that their sections are not overlapped by planes including axis of pump shaft. In other design version, partitions are installed additionally on bottom of slots of guide channels.

EFFECT: improved operation reliability.

4 cl, 8 dwg