Novel piston sealing device

Abstract

The invention provides a novel piston sealing device. The device comprises an elastic compensation support, an elastic force compensation O-shaped rubber ring, a polytetrafluoroethylene guide ring and two sealing O-shaped rubber rings, wherein the elastic compensation support is sleeved with a piston sealing groove, a semicircular groove is formed in the middle of the elastic compensation support, and micro-protrusions are evenly distributed on the left side face and the right side face of the elastic compensation support correspondingly. The elastic force compensation O-shaped rubber ring is sleeved with the semicircular groove, the elastic force compensation O-shaped rubber ring sleeves the polytetrafluoroethylene guide ring, the section of the polytetrafluoroethylene guide ring is composed of a left sealing supporting section, a right sealing supporting section and a middle guide section, and the sealing supporting sections and the middle guide section are smoothly manufactured through two deformation arc sections. The outer pressed faces of the sealing supporting sections and the deformation arc sections form U-shaped deformation grooves, and the sealing O-shaped rubber rings are sleeved with the deformation grooves. The device is wide in application range, high in sealing compensation capacity, small in friction force, good in sealing performance and long in service life.

Description

technical field [0001] The invention relates to a driving hydraulic cylinder of a hydraulic machine, in particular to a novel piston sealing device. Background technique [0002] The drive hydraulic cylinder is the executive element in hydraulic machinery. The piston seal of the hydraulic cylinder is a reciprocating seal, which mainly realizes the seal between the piston and the cylinder body to prevent internal leakage of hydraulic oil. It plays an important role in the movement performance and sensitivity of the hydraulic cylinder. . The piston seal often adopts a combination of two lip-shaped elastic seals or a combination of PTFE guide ring and O-shaped rubber ring. The former has a larger friction force during relative movement because the lip of the elastic seal is in direct contact with the cylinder wall. The service life of the elastic seal is shortened. After the latter combined seal is operated for a long time, the elastic deformation capacity of the O-shaped rubb...

AI Technical Summary

Problems solved by technology

The piston seal often adopts a combination of two lip-shaped elastic seals or a combination of PTFE guide ring and O-shaped rubber ring. The former has a relatively large friction force during relative movement because the lip of the elastic seal is in direct contact with the cylinder wall. The service life of the elastic seal is shortened. After the latter combined seal has been operated for a long time, the elastic deformation capacity of the O-shaped rubber ring will be weakened, so that the contact stress between the PTFE guide ring and the cylinder wall is reduced, which is easy to cause Oil leakage, which affects the working performance of the hydraulic cylinder

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