SUBMERSIBLE VOLUMETRIC PUMP Russian patent published in 2016 - IPC F04B47/08 

FIELD: engines and pumps.

SUBSTANCE: invention relates to pump equipment and can be used in oil producing industry during operation of marginal wells with complicated oil formation characteristics. Pump includes submersible electric motor, drive oil pump, piston working pump consisting of upper guide hollow rod, two pistons rigidly coupled by central hollow rod, inside which hydraulic channel is located to communicate compensation under-piston liquid together, with suction and delivery valves, rigidly connected to hydraulic actuator via rod. Cavities of the latter are connected to drive oil pump suction and pressure lines via automatic reversible valve. At the latter safety valve is installed consisting of one piston, with located inside working channels, rigidly connected to guiding hollow rod. Hydraulic compensator above-piston cavity is connected to working pump output, an under-piston one is with working pump above-piston cavity and through channel in central rod is with working pump under-piston cavity. Comprises oil tank with oil fine cleaning filters, oil volume expansion compensator. Electric motor is equipped with protector, via shaft of which electric motor shaft is kinematically connected with drive oil pump shaft.

EFFECT: invention usage allows to improve pump operational and process characteristics, as well as improve its reliability and safety.

22 cl, 4 dwg