Following type sealing device of petroleum drilling reciprocating pump

Abstract

The utility model relates to the technical field of sealing elements, and discloses a petroleum drilling reciprocating pump following type sealing device which comprises a piston and an annular plate, the annular plate is tightly attached to the surface of the end face of the piston, the annular plate is fixedly installed on the surface of the piston through bolts, the side edge of the annular plate is fixedly connected with a scraping ring through a connecting rod, and the scraping ring is parallel to the surface of the annular plate. Three annular grooves are formed in the outer circle of the piston in a surrounding mode, metal rings are clamped in the annular grooves, and a plurality of through holes are evenly formed in the positions, among the annular grooves, of the surface of the piston and communicate with the interior of the piston. According to the technical scheme, the scraping ring is fixed to the end face of the piston, the outer circle of the scraping ring is attached to the inner surface of the cylinder body, petroleum adhering to the interior of the cylinder body is scraped off by the scraping ring in the movement process, then the piston containing the metal rings passes through the scraping ring, and lubricating oil can act on the side edge of each metal ring through the through holes, so that the service life of the piston is prolonged. A good lubricating effect can be achieved, abrasion is reduced, and the service life is ensured.

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