DOWNHOLE SUCKER-ROD PUMP Russian patent published in 2020 - IPC F04B47/00 

FIELD: machine building.

SUBSTANCE: invention relates to machine building, particularly to well sucker-rod pumps, and can be used in oil industry. Pump comprises interconnected stages of cylinder and plunger of large and small diameters. Plunger is arranged in the cylinder to form a variable-volume chamber between the adapters. Suction and discharge valves are arranged in large-diameter plunger stage, respectively, in its lower part and in valve body. Shutoff element of the suction valve is made in the form of a bushing with an upper collar mating to the upper seat, and by the lower end it corresponds to the lower seat. Bushing from above is equipped with a branch pipe. Valve body by means of branch pipes is rigidly connected with adapter of stages of plungers and telescopically connected to branch pipe of bushing with formation of lower chamber of variable volume. In the adapter of the plunger stages and in the bushing branch pipe there are through radial holes, at that the radial hole of the bushing branch pipe is made with possibility of partial overlapping in the upper position of the bushing. Plunger is equipped with a rod with a shut-off element of the delivery valve placed in its lower part between the top and bottom supports of the rod. In the travel limiter of the shut-off element of the delivery valve there is a central through axial hole mating in the lower part of the rod with the possibility of limited axial movement of the rod relative to it between the upper stop and the end face of the stroke limiter.

EFFECT: disclosed is downhole sucker-rod pump.

4 cl, 3 dwg