SUBMERSIBLE DIAPHRAGM-TYPE ELECTRIC PUMP Russian patent published in 1996 - IPC

FIELD: submersible positive-displacement pumps for lifting liquids from wells. SUBSTANCE: pump has electric motor. Mechanical gearing includes bevel reduction gear and eccentric drive. Hydraulic drive of diaphragm is made in form of plunger pump. Working chamber 22 with suction and delivery valves is located in head 5 of pump. Suction valve includes ball gate 13; working chamber 22 is brought in communication with delivery valve inlet by means of vertical passage 21. Suction and delivery valves have cylindrical grates 14 pressing seat 12 to head 5 of pump. In area where seat 12 of delivery valve is located, head 5 is provided with inner circular groove 18 brought in communication with vertical passage 21. Grate 14 is provided with radial passages 19 running to working surfaces of valve seat. Delivery valve is also provided with circular groove 23 made in its body. Inclined passages 25 are provided in body 9 of suction valve. EFFECT: enhanced reliability. 2 cl, 3 dwg