BOTTOM-HOLE SUCKER-ROD PUMP Russian patent published in 2019 - IPC F04B47/00 

FIELD: machine building.

SUBSTANCE: invention relates to machine building, particularly, to vertical plunger pumps with self-acting valves, especially for pumping highly viscous liquids containing mechanical impurities and gas, and can be used in oil industry. Downhole sucker-rod pump comprises a cylinder with steps of larger and smaller diameter, a suction valve comprising upper and lower seats, a shut-off member made in the form of a bushing with an upper collar mating the upper seat, a plunger with steps of greater and smaller diameter mating with the cylinder with a pressure valve, as well as a pipe rigidly connected to the small diameter plunger and telescopically connected to the bushing. Lower seat is located in pump bottom with through axial hole. In bottom part of plunger above seat there are at least three through radial holes with equal angular pitch from each other with possibility of connection with axial bores of bottom. Bushing is installed with the possibility of limited axial movement along the plunger and the branch pipe to form an alternating-volume chamber between the plunger and the branch pipe. At least one through radial hole is made in the lower part of the branch pipe with possibility of its partial overlapping by the bushing.

EFFECT: proposed is vertical plunger pump with self-acting valves.

3 cl, 6 dwg