Sealing structure with favorable safety for piston cylinder

Abstract

The invention designs a sealing structure with favorable safety for a piston cylinder, which comprises a cylinder body, a piston, a first end cover, a second end cover, a piston rod and a piston rod sealing ring. The sealing structure is characterized in that a fine clearance is reserved between the piston and the inner wall of the cylinder body; a circumferential groove is arranged on the circumferential wall of the piston; a friction block for limiting the clearance and lubricating the friction is arranged in the circumferential groove; a piston pressure-relief hole is arranged in the piston, wherein the piston pressure-relief hole penetrates through along the diameter direction of the piston and is communicated with the circumferential groove; and a first pressure-sensitive valve is arranged in the axial direction of the piston, wherein the first pressure-sensitive valve is used for communicating a rod cavity with the piston pressure-relief hole and controlling the flowing to be in a one-way direction from the rod cavity to the piston pressure-relief hole and simultaneously communicating a rodless cavity with the piston pressure-relief hole and controlling the flowing to be in a one-way direction from the rodless cavity to the piston pressure-relief hole. Compared with the prior art, the piston cylinder structure provided by the invention is more suitable for work conditions of great pressure fluctuation.

Description

technical field [0001] The invention relates to a cylinder body structure, in particular to a piston-cylinder sealing structure suitable for fluctuation pressure and good safety. Background technique [0002] As we all know, a piston cylinder usually includes a cylinder body, a first end cover and a second end cover arranged at both ends of the cylinder body, a piston arranged in the cylinder body and a piston rod connected to the piston through the first end cover, and the piston connects the cylinder The internal cavity is divided into a rod cavity and a rodless cavity. Since the piston cylinder works by pressure, the sealing performance of the cylinder body and the sealing performance between the rod chamber and the rodless chamber are relatively high. The sealing method adopted is usually to make a groove on the peripheral wall of the piston, and a sealing ring is arranged in the groove, and the sealing between the rod cavity and the rodless cavity is guaranteed by the ...

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Problems solved by technology

[0003] However, in the actual working process, the pressure source cannot always be kept under the control of the ideal value, and the pressure medium entering the inner cavity of the cylinder will fluctuate more or less during the working process

For small-scale fluctuations, it will not have much impact on the piston cylinder itself and the working state, but for larger fluctuations, the movement speed of the piston will change suddenly, resulting in abnormal wear of the sealing ring, causing abnormal working conditions and even A safety accident occurs, and the service life of the sealing ring is also greatly reduced

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