Piston assembly realizing adjustable diameter through grease injection

Abstract

The invention relates to a piston assembly realizing adjustable diameter through grease injection, and belongs to the technical field of accessories of petroleum drilling and production mud pumps. Thepiston assembly consists of a mud pump pull rod, a piston iron core, a locking nut, a nylon support ring, piston rubber, a rubber compression ring, a water injection quick connector and a high-pressure cement injection connector, wherein the piston rubber is mounted at the small-diameter end of the piston iron core, the nylon support ring is mounted at the bottom of the piston rubber, and the rubber compression ring is mounted at the front edge of the piston rubber; and a cooling water injection hole and the water injection quick connector are manufactured at the large-diameter end of the piston iron core. Along with the change of the deformation torque of the piston rubber, adjustment can be carried out through the amount of injected cement, the abrasion degree of a cylinder sleeve can be properly increased, then the service life of a single piston is prolonged, and meanwhile, the service life of an existing cylinder sleeve piston is prolonged by 3-4 times; and the problems that forthe existing cylinder sleeve piston, when the sealing of a piston cup is rebuilt, a cylinder cover needs to be opened, consequently, mud flows out, then waste is caused, and the environment is also polluted are solved, the production cost and time are saved, and the labor intensity is alleviated.

Description

technical field [0001] The invention relates to a grease-injected diameter-adjustable piston assembly, which belongs to the technical field of oil drilling mud pump accessories. Background technique [0002] The piston assembly of the existing public mud pump known in the market is composed of a supporting iron core and a rubber sealing cup. The size of the bowl is slightly larger than the inner diameter of the cylinder liner. After assembly, the rubber sealing cup is compressed and deformed in the cylinder liner by a certain amount, and the amount of compression deformation is used to play a sealing role. With this structure, when the piston reciprocates in the cylinder liner and generates pressure, the rubber sealing cup of the piston and the cylinder liner will wear for a long time, and the outer dimension of the cup will decrease continuously and be accompanied by deformation. At the same time, the inner diameter of the cylinder liner will also change. Correspondingly, ...

AI Technical Summary

Problems solved by technology

With this structure, when the piston reciprocates in the cylinder liner and generates pressure, the rubber sealing cup of the piston and the cylinder liner will wear for a long time, and the outer dimension of the cup will decrease continuously and be accompanied by deformation. At the same time, the inner diameter of the cylinder liner will also change. Correspondingly, the deformation torque between the rubber sealing cup of the piston and the cylinder liner is insufficient at this time, resulting in a gap, forming a pressure leak and accelerating the damage of the wear-resistant parts, and finally making it difficult to achieve a sealing effect

On the other hand, once a puncture leak occurs in this sealing structure, it cannot be remedied, and the service life is short. After a gap occurs, only the new piston and cylinder liner can be replaced, which not only leads to an increase in production costs, but also increases labor costs and equipment maintenance time.

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