MULTI-STAGE PUMP Russian patent published in 2010 - IPC F04D1/06 F04D29/41 

FIELD: engines and pumps.

SUBSTANCE: invention relates to structural components of multi-stage bypass pumps to be used in oil processing industry. Proposed pump comprises stator section with housing 1, inlet and outlet branch pipes 2, 3, and feed and discharge covers 4, 5. Said housing 1 accommodates rotor part comprising shaft 6 with impellers 7 and axial force relief device 8. Stator and rotor parts are coupled by bearings 9, 10. Said pump is designed so that drive end of shaft 6 and radial-thrust bearing 9 are arranged on the side of pressure cover 5, while inlet branch pipe 2 is arranged horizontally. Outer surface of housing 1 has lay-on channel 11 that communicates, via hole 12 and additional holes in pressure cover 5 and housing 1, suction chamber with that arranged behind aforesaid axial force relief device 8.

EFFECT: improved design, higher reliability and ease of assembly.

3 cl, 1 dwg