Manufacture technology of telescopic and elastic piston oil seal

Abstract

The invention discloses a manufacture technology of a telescopic and elastic piston oil seal. The oil seal is made from a raw material A and a raw material B, wherein the raw material A is pure polytetrafluoroethylene; the raw material B comprises the components based on mass percentage: 60%-95% of polytetrafluoroethylene and 5%-40% of filler, wherein the filler comprises one or a plurality of polyether-ether-ketone, glass fiber, copper, carbon fiber, and the like. The materials with two different components can produce a raw material blank by repeatedly forming in a pressing way, sintering, quickly cooling and the like, and the raw material blank is mechanically machined to form an oil seal finished product. The monolayer lip wall of the finished product oil seal is thin and good in flexibility; and the oil seal has a telescopic space when the oil seal is thermally expanded by the rising of the temperature during working, so that the frictional resistance between the lip edge of an upper oil seal and the wall of a cylinder is small, the friction loss is hard, a gap is easy to compensate, the leakproofness is good, and the service life (which is more than 1000h) is finally prolonged. The oil seal has the performance that compared with the material B, the material A is more elastic and lower in rigidity; and compared with the material A, the material B is more wearable, higher in rigidity, and lower in elasticity.

Description

technical field [0001] The invention relates to an oil seal on a piston of a compression mechanism of an air compressor, in particular to a manufacturing process of the oil seal. Background technique [0002] The piston oil seal is mainly used on the piston of the compression mechanism of the air compressor, and its working principle is as follows (refer to the attached figure 1 ), the rigid piston cylinder is fixed, the oil seal is locked on the connecting rod through the screw and the pressure block, and the connecting rod reciprocates up and down in the piston cylinder. The elastic expansion and contraction deformation) in the piston cylinder is stretched and deformed and the internal pressure is close to the wall of the piston cylinder, so as to repeatedly reduce and increase the closed compression chamber to achieve the purpose of compressing the medium and increasing the pressure. [0003] At present, the lip end and the main structure of the oil seal produced by the ...

AI Technical Summary

Problems solved by technology

[0003] At present, the lip end and the main structure of the oil seal manufactured by the conventional process are integrally pressed and formed by one material, and then processed and formed after sintering. Because the same material needs hardness, the flexibility and elasticity are poor.

When the temperature rises and expands during operation, there is no space for expansion and contraction, resulting in friction between the lip of the upper oil seal and the cylinder wall. The resistance is large and easy to wear. After wear, the gap compensation is insufficient, the airtightness is not good, it is difficult to reach the rated pressure, and the compression efficiency is low. , short service life (only about 500h)

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