SUBMERSIBLE MULTI-PHASE PUMP UNIT Russian patent published in 2011 - IPC F04C2/16 F04B47/00 

FIELD: engines and pumps.

SUBSTANCE: submersible multi-phase pump unit includes submersible electric motor 1 with seal section 2, pump 3 and compensator 4 arranged between them. In pump 3 body between suction and delivery cavities there located is working cavity made in the form of two parallel cylindrical bores in which two rotors with screws adjacent to each other are arranged. Mutual position of screws is synchronised with engaged link gears fixed on rotors. Shafts of rotors are borne against bearing supports. Rotors are fixed with thrust bearings against axial displacement. Outlet end of one of the shafts through gear system, shaft of compensator 4 and shaft of seal section 2 are connected to shaft of submersible electric motor 1. The cavities in which gear system, bearing supports, thrust supports and link gears are arranged are isolated from suction cavity with end seals and connected together to additional cavity and lubrication liquid cavity of compensator 4 through channels made in pump 2 and compensator 4 bodies and pipeline to closed circulation system of lubrication liquid.

EFFECT: improving operating reliability of pump unit.

7 cl, 5 dwg