IMMERSION CENTRIFUGAL PUMP UNIT Russian patent published in 2002 - IPC

FIELD: hydraulic machine building, particularly, immersion electric centrifugal units. SUBSTANCE: pump unit has immersion electric motor protected from ingress of hydraulic matter, subsurface pump and inlet module. Inlet module shaft in upper part is made in the form of cylindrical hollow head with splines on internal cylindrical surface and solid bottom. Head accommodates flexible member. Head lower external end face is ground and rests on polished cylindrical disc which is located through flexible member in cylindrical internal bore of upper part of inlet module body and locked from turning by lock. Invention may be used in oil production from wells. EFFECT: higher operating reliability of module immersion pump unit due to reduced vibration. 1 dwg