SUBMERGED MULTI-STAGE CENTRIFUGAL PUMP Russian patent published in 2008 - IPC F04D13/10 F04D29/62 

FIELD: engines and pumps.

SUBSTANCE: invention relates to submerged multi-stage centrifugal pumps designed for petroleum production. The pump incorporates cylindrical case 6 accommodating guiding apparatuses (GA) 1 with regularly arranged ledges 2 on the outer cylindrical surface. Space between the inner surface of case 6 and outer surface of GA ,1 between ledges 2, is filled with a compound to get polymerised to form elastic homogeneous body 13. this allows fixing GA 1, reducing radial pump vibration and sealing the gap between case 6 and GA 1 of the stage. Shaft 8 is furnished with a protective bushing with an end face cylindrical head. The said head inner annular surface, along with the end face of hub 9 of GA 1, form an end face sealing and additional axial support of impeller 3 front disk of hub 9 of the pump.

EFFECT: longer pump life.

2 dwg