OIL-WELL SUCKER-ROD PUMP Russian patent published in 1995 - IPC

FIELD: oil industry. SUBSTANCE: plunger provided with groove and coupler having the collet with the rod. The rod is connected with the column of the pump rods and provided with a conical side. The side has self-braking angle and is diverging in the direction of the receiving opening of the pump for permitting contact with the opening of the collet. The opening is conical and provided with a cylindric projection on the outer side to contact with the groove. The flow swirler is mounted in the receiving opening of the pump. The swirler is made up as a screw groove. The longitudinal axis of the screw groove is shifted with respect to the opening of the seat of the sucking valve. The plunger is provided with mud catchers for permitting contact with inner side of the working cylinder. The mud catchers are mounted from the side of sucking and delivery spaces of the pump. Relief openings are made in the plunger from the side of the delivery space upstream of each mud receiver. The openings serves for connection of the delivery space with the inner passage of the plunger. EFFECT: improved design. 2 cl, 3 dwg