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Novel piston sealing device

A sealing device and piston technology, which is applied in the direction of engine sealing, fluid pressure actuating device, engine components, etc., can solve the problems of weakening the elastic deformation ability of the O-shaped rubber ring, shortening the service life of the elastic seal, affecting the working performance of the hydraulic cylinder, etc. , to achieve the effect of long service life, improved sealing performance and strong sealing compensation ability

Pending Publication Date: 2021-06-25
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Novel piston sealing device

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Embodiment Construction

[0021] The implementation of the present invention is further described in conjunction with the accompanying drawings.

[0022] A new type of piston sealing device, the sealing device is used to seal the gap between the piston 1 and the cylinder body 9, including the elastic compensation support 2 set in the sealing groove of the piston 1, the elastic compensation O-shaped rubber ring 3, polytetrafluoroethylene Vinyl guide ring 12, two sealing O-shaped rubber rings 6, a semicircular groove 4 is formed in the middle of the elastic compensation support 2, and microscopic protrusions evenly distributed are formed on the left and right sides, and the elastic compensation The O-shaped rubber ring 3 is set in the semicircular groove 4, and the polytetrafluoroethylene guide ring 12 is set outside the elastic compensation O-shaped rubber ring 3, and the section of the polytetrafluoroethylene guide ring 12 is from left to right. The seal support section 5 on both sides and the middle g...

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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...

Claims

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Application Information

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IPC IPC(8): F15B15/14F16J15/3224F16J15/3208
CPCF15B15/1452F16J15/3224F16J15/3208
Inventor 张付英贺佘燕张志祥
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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