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

FIELD: engines and pumps.

SUBSTANCE: invention relates to machine building and can be used in oil producing industry during operation of marginal wells with complicated oil formation characteristics. Pump includes kinematically connected to each other submersible oil-filled electric motor, protector, drive pump, fine filter, safety valve, filter, diaphragm, two-piston working pump. Piston cavity of the latter is connected to working pump output. Oil tank contains fine oil filters. Working piston pump additionally comprises central nipple, in which extracted fluid receiving channels are made. In said central nipple channels suction valves are installed. In working pump lower piston discharge channel is made, in which pressure valve is located. In working pump upper piston pressure channel is made, in which pressure valve is installed. Suction and discharge channels are made with possibility of suction and discharge valves arrangement so, sucked and pumped fluid flow flows upwards through these valves.

EFFECT: use of disclosed invention allows to improve equipment reliability.

6 cl, 1 dwg