OIL WELL PUMP Russian patent published in 2019 - IPC F04B47/00 E21B37/08 

FIELD: machine building.

SUBSTANCE: invention relates to the field of machine building, to the oil well pumps, and can be used in the oil industry. Device contains a cylinder with a suction valve, the receiving filter, made in the form of a perforated shank with the cleaning means. Receiving filter is telescopically connected to the working cylinder and is made with possibility of limited by the stopper axial movement. Filter cleaning means contain two centralizers, made, for example, in the form of rings female to the cylinder and shank, connected by at least three rods with the same angular pitch relative to each other. Upper centralizer is rigidly connected to the cylinder. Shank is installed with possibility of limited axial movement relative to the lower centralizer. Cleaning means is equipped with made in the form of rings scrapers, in which female to the rods three through holes are made, through which the rods are passed. Scrapers are fixedly installed in the rods and, for example, fixed therein by means of clamping screws performing the functions of stoppers. In the shank upper part, at least two closed longitudinal grooves can be made with possibility of the grooves lower and upper walls interaction with the stopper.

EFFECT: increase in the operation reliability, the design becomes simpler.

4 cl, 4 dwg