SUCKER-ROD PUMP UNIT Russian patent published in 2009 - IPC F04B47/00 

FIELD: engines and pumps.

SUBSTANCE: invention is related to oil industry and may find application in production of oil and well bottom zone handling and effect at producing platform. The unit comprises pump cylinder plugged in lower end part with holes in upper part and plunger with valves installed in body with the possibility of reciprocal motion. The cylinder plugged in lower end part is arranged as movable with annular slot and thrust and is installed with the possibility of reciprocal motion inside sub having side holes and sealing cylinders. Sub is screwed on cylinder connected to column of pump-compressor pipes, and is threaded via coupling into jacket, which in its turn is threaded into valve body equipped with ball and sludge trap. Plunger with valve is connected to rods column on one side, and to auxiliary plunger having side hole and valve - on the other side. The plunger forms working pair with cylinder, and auxiliary plunger forms working pair with movable cylinder.

EFFECT: increased pump efficiency.

3 dwg