BOREHOLE ELECTROHYDRAULIC PUMP UNIT Russian patent published in 2018 - IPC F04B47/08 

FIELD: engines and pumps.

SUBSTANCE: installation includes a kinematically connected submersible electric motor, a drive pump and a hydraulic motor, and a working pump with a discharge and suction valves. Additionally contains a flow divider and a mechanical switch. The drive pump, the flow distributor, the flow divider, the mechanical switch linked with the hydraulic cylinder rod, and all of these units are located in a cylindrical housing filled with oil. The submersible motor is connected to the drive pump by means of a coupling and has a common oil system with hydraulic protection.

EFFECT: higher efficiency of the low-yield submersible electrohydraulic drive pump unit.

3 cl, 1 dwg