SUBMERSIBLE DIAPHRAGM ELECTRIC PUMP FOR LIFTING LIQUID FROM WELL Russian patent published in 1996 - IPC

FIELD: pumping liquids out of wells. SUBSTANCE: rows of through holes are located in upper portion of safety screen; rows of radial through holes are provided in lower portion of suction tubes. Upper edge of these tubes is located below upper row of through holes of screen. Total area of all through holes of screen is equal to or more than area of circular clearance between inner diameter of casing string of well and outer diameter of electric pump housing. Total area of all radial holes of each suction tube exceeds area of its inner hole. EFFECT: enhanced reliability. 1 dwg