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Piston rod sealing component and hydraulic device of multi-stage oil cylinder

A technology of sealing components and piston rods, which is applied in the direction of fluid pressure actuation devices, etc., can solve the problems of poor sealing effect of cylinder piston rods, and achieve the effects of not easy to tear and damage, good flexibility and sealing, and high tensile strength

Active Publication Date: 2019-12-13
武汉市荣生密封技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of poor sealing effect of the cylinder piston rod in the prior art

Method used

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  • Piston rod sealing component and hydraulic device of multi-stage oil cylinder
  • Piston rod sealing component and hydraulic device of multi-stage oil cylinder
  • Piston rod sealing component and hydraulic device of multi-stage oil cylinder

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] In describing the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than in...

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Abstract

The invention belongs to the technical field of sealing of multi-stage oil cylinders and particularly provides a piston rod sealing component and a hydraulic device of a multi-stage oil cylinder. A main sealing ring comprises an annular sealing body; one end of the sealing body comprises an outer lip opening and an inner lip opening; the outer lip opening and the inner lip opening enclose each other to form an annular groove which extends about the sealing body; the outer lip opening protrudes toward the outer side of the sealing body; the inner lip opening protrudes toward the inner side of the sealing body; the section of the annular groove is in a U shape; and the bottom of the annular groove is in a circular arc shape and is in a gradually-enlarged shape in the direction away from thebottom. The sealing component has a sealing performance for bearing high pressure and has the function of reducing backpressure; when the backpressure of the main sealing ring is too high, by virtue of the small interval flow generated when the lip opening at the inner side of the sealing body is pushed outwards due to stress, pressure is released via a special oil returning passage, and thus theservice life period of the sealing component is prolonged. Besides, the main sealing ring is high in tensile strength, resists impact, is not prone to being torn or damaged and is quite good in flexibility and leakproofness.

Description

technical field [0001] The invention belongs to the technical field of multistage oil cylinder seals, and in particular relates to a multistage oil cylinder piston rod seal assembly and a hydraulic device. Background technique [0002] In the field of dump trucks, the sealing configuration of multi-stage oil cylinders is often involved. The multi-stage oil cylinders of traditional dump trucks use two ordinary Y-shaped sealing rings. The Y-type main seal can only simply withstand high pressure sealing, and has no function of reducing back pressure. There is a normal fit gap between two ordinary Y-rings used in series and the guide ring. When the piston rod moves at high pressure, the main seal will seep in a small amount due to many factors, and it will be completely prevented by the second seal in its interval. in the cavity. The small space is easy to generate back pressure, which cannot be reduced and damages the seal. When the second Y-ring is under slight pressure, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B15/14
CPCF15B15/1461F15B15/1423
Inventor 黄佑生
Owner 武汉市荣生密封技术有限公司
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