DESIGN OF MULTISTAGE PUMP Russian patent published in 2007 - IPC F04D1/06 F04D13/10 F04D29/47 F04D29/22 

FIELD: oil and gas producing industry.

SUBSTANCE: invention relates to production of electric centrifugal pumping units for oil wells. Proposed multistage pump has housing, centrifugal impeller s, guide assemblies, shaft radial and axial bearings. Centrifugal impellers are provided with guide assemblies secured on wall and made of plates twisted to center along involute. Sealing rings arranged between centrifugal impellers are made in form of radial bearings engaging with housing. Axial and radial bearings between shaft and housing are installed at pump input and output. When radial bearings are arranged out of passage, area, they are not subjected to abrasive wear. Centrifugal impellers are not choked with abrasives as they have no pockets for accumulating abrasives. Deposition of salts on centrifugal impellers is reduced owing to straight-floe make of rotor.

EFFECT: increased wear resistance of pump.

2 dwg