IMMERSION CENTRIFUGAL PUMP UNIT Russian patent published in 1999 - IPC

FIELD: immersion pumps, in particular, electric pumps for production of petroleum. SUBSTANCE: the outer surface of the pump unit module-head has a groove for prevention of accident falls of the pump unit into the well. A cylindrical hollow bush is installed inside the body of the module-head. A taper shoulder and radial holes are made in the lower part of the bush. The upper part of the bush is made in the form of a nut with a taper shoulder and threaded connection lock. EFFECT: enhanced reliability. 1 dwg