WELL SUCKER-ROD PUMP Russian patent published in 2018 - IPC F04B47/00 F04B53/02 

FIELD: oil and gas industry.

SUBSTANCE: pump comprises a hollow plunger with a delivery valve, a cylinder with a suction valve in the lower part and an annular projection in the middle part. On the annular projection there are sealing rings which interact with the plunger side wall. Two shells of side wall of truncated cone tapering upward are mounted on the upper end of the cylinder annular projection. The shells are made with cylindrical walls on inner faces. The cylindrical walls of both shells have radial slots which do not reach the outer face of the shells. The petals of one shell are opposite the radial slots of the other shell. At that the shells, in the places between the outer face and the petals are fixed to each other by contact welding. The cylindrical walls of petals of both shells are tightly pressed against the plunger side wall. The shells are fixed against upward movement by a plate-shaped ring in the form of a conical washer. Lower conical wall of the plate ring adjoins the upper conical wall of the upper shell. Radial cylindrical recesses are made in the outer side wall of the cylinder opposite the upper conical wall of the plate ring. The bottom of each cylindrical recess is provided with a radial threaded recess equipped with a mounting screw and made with a cylindrical head with a conical end interacting with conical wall of the plate-shaped ring.

EFFECT: simplified structure and enhanced efficiency.

3 dwg