BOREHOLE MULTISTAGE MODULAR PUMP AND PUMP STAGE Russian patent published in 2014 - IPC F04D13/10 F04D29/44 F04D29/02 

FIELD: engines and pumps.

SUBSTANCE: set of inventions relates to ump production, particularly to borehole multistage centrifugal pumps designed to extract oil from wells. Proposed pump comprises head, base and housing accommodating pump stages. Every said stage comprises polymer impeller with hub and distributor including the barrel with outer sleeve, top disc and axial; bearing made of metal, blades and bottom disc made of polymer. Said housing accommodates radial intermediate bearings with two carbide bushes, one being fitted on pump shaft and another one in bearing housing. Distributor comprises hub made of polymer material. Spacing between intermediate radial bearings with carbide bushes does not exceed 0.5 m.

EFFECT: higher reliability, lower costs.

11 cl, 4 dwg