SUBMERGED DIAPHRAGM ELECTRIC PUMP FOR LIFTING BED LIQUID FROM WELL Russian patent published in 1995 - IPC

FIELD: oil industry. SUBSTANCE: electric motor and pump with a reduction gear are mounted on the common shaft. Sucking and delivery valves are mounted inside the pump head vertically and are axially alined. The opposite end of the shaft of the electric motor is provided with the second identical pump mounted inside the housing for permitting its operation in antiphase with the first pump. The piping diaphragm is interposed between the sucking and delivery valves of the second pump and defines a space around it, the space being in communication with under-diaphragm space of the pump through passageways made in the head. The space is filled with a ballast liquid. Each of the pumps is provided with a free-running clutch at the site of connection with the shaft of the electric motor. EFFECT: enhanced efficiency. 2 cl, 6 dwg