ROTARY TWO-STAGE PUMP WITH MUTUALLY FLARED-OUT IMPELLERS Russian patent published in 2015 - IPC F04D1/06 F04D29/42 F04D29/62 

FIELD: engines and pumps.

SUBSTANCE: pump consists of stator with two pressure covers, two distributors, shell ring and rotor with impellers fitted in cantilever on the shaft. Distributors abut on each other. Chanel of working fluid overflow from first stage to second stage is arranged between said distributors and shell ring and is sealed by clearance between surfaces of joint and between surfaces of OD of distributors and surface of shell ring ID. Shell ring is locked between pressure covers. Front pressure cover has ribbed recesses for second stage distributor to thrust against. Said ribs direct the working fluid flow. Pump inlet and outlet are separated by rubber rings fitted in shell ring circular grooves locked by locating center surfaces of both pressure covers.

EFFECT: lower production costs, higher reliability and better manufacturability Lower hydraulic loses.

3 cl, 8 dwg