High-pressure leak-proof hydraulic cylinder

Abstract

The invention provides a high-pressure leak-proof hydraulic cylinder. The high-pressure leak-proof hydraulic cylinder comprises a piston rod provided with a piston block, a cylinder body provided witha cavity and a cylinder sleeve comprising an end cover and a sliding wall, wherein the cylinder sleeve is fixed into the cavity, and the end cover is fixed to the upper end of the cylinder body; theupper end of the inner wall of the cavity is hermetically connected to the upper end of the outer wall of the sliding wall, and a spacing is arranged between the middle and the lower part of the outerwall and the inner wall of the cavity; the piston rod penetrates through the end cover and is arranged in the cylinder sleeve and can move up and down in the cylinder sleeve, the piston block is hermetically connected to the cylinder sleeve to divide the cylinder sleeve into a working high-pressure cavity and a low-pressure backflow cavity which are isolated from each other, and the piston rod ishermetically connected to the end cover; and a first channel communicating with the working high-pressure cavity and a second channel communicating with the low-pressure backflow cavity are arrangedon the piston rod. The high-pressure leak-proof hydraulic cylinder can solve a problem of poor sealing performance of the hydraulic cylinder, which is caused by the changes in a piston gap due to highpressure.

Description

technical field [0001] The invention relates to the field of hydraulic cylinder equipment, in particular to a high-pressure leak-proof hydraulic cylinder. Background technique [0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swing motion). It has simple structure and reliable operation. When it is used to realize reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the motion is stable, so it is widely used in various mechanical hydraulic systems. [0003] In the prior art, the hydraulic cylinder works under high pressure, and the cylinder will expand outward due to the high pressure. When the cylinder is stressed and deformed to a certain extent, when the gap between the cylinder and the piston exceeds the design gap of the seal, oil leakage will occur, and in severe cases, the seal will be squeezed out and the seal groo...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention proposes a high-pressure leak-proof hydraulic cylinder, which can solve the problem of poor sealing performance of the hydraulic cylinder caused by the change of the piston gap due to high pressure

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