SUCKER-ROD PUMP UNIT Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: pump has a cylinder with a suction valve and an inlet filter fastened in the cavity of a column of pump-compressor tubes to form an annular clearance. A plunger is connected to a drive. A bypass device for communicating the inner cavity of pump-compressor tubes with the beyond-the-tube space is made in the form a bypass valve with a spring-loaded shutter connected to the lower part of the cylinder of the sucker-rod pump by a coupling and a branch pipe fastened to it. The branch pipe is passed through the cavity of the inlet filter. The valve outlet communicates with the branch pipe cavity. The clutch has axial channels for communicating the filter cavity with the pump suction valve, and a radial channel for communicating the branch pipe outlet with the cavity of the pump-compressor tubes. EFFECT: improved structure. 2 cl, 3 dwg