CN215486940U

CN215486940U - Hydraulic cylinder sealing device

Info

Publication number: CN215486940U
Application number: CN202120961633.4U
Authority: CN
Inventors: 武文俊; 武文虎; 冯雪山
Original assignee: Shanxi Hiprui Technology Co ltd
Current assignee: Shanxi Hiprui Technology Co ltd
Priority date: 2021-05-07
Filing date: 2021-05-07
Publication date: 2022-01-11
Anticipated expiration: 2031-05-07

Abstract

The utility model relates to a hydraulic cylinder sealing device, belonging to the technical field of mechanical tools; a piston (5) and a seal assembly (4); the seal assembly is composed of a seal and an elastomeric ring (404); the elastic ring is arranged in a sealing ring groove of the piston, and a sealing piece is arranged on the elastic ring to realize sealing between the piston and the cylinder barrel (2); the elastic ring is matched with the sealing ring groove in size; and a liquid circulation hole (501) is formed in the contact end of the elastic ring mounting position on the piston and the liquid level of the piston, so that liquid can flow into the sealing ring groove under the action of pressure to extrude the elastic ring outwards and further extrude the sealing element. The utility model reduces the pressure between the sealing device and the cylinder barrel during no-load operation, reduces the sliding friction loss to a certain extent, further effectively improves the efficiency of the hydraulic cylinder, and in addition, the aging life of the rubber ring is prolonged and the service life of the hydraulic cylinder is prolonged by reducing the pressure between the sealing device and the cylinder barrel.

Description

Hydraulic cylinder sealing device

Technical Field

The utility model relates to a sealing device, in particular to a hydraulic cylinder sealing device, and belongs to the technical field of mechanical tools.

Background

The sealing device of the hydraulic cylinder commonly used at present is that a sealing ring groove is arranged on a piston, an O-shaped sealing ring or a combined sealing component (hereinafter referred to as a sealing element) is arranged in the sealing ring groove, and the pre-compression amount of the sealing element is utilized to realize sealing. This technical scheme has realized sealed function to a certain extent, but to the pneumatic cylinder of low pressure (liquid bears the load and is within 100 MPa) high speed (more than 30 per minute) operation, certain pressure has been formed between sealing member and the cylinder under certain precompression volume, and sliding friction between sealing member and the cylinder will make the temperature of sealing member rise rapidly under high speed operation, and the sealing member will age fast, influences the life of sealing member, and then influences the life of pneumatic cylinder. If the temperature is too high, the gluing phenomenon between the sealing element and the cylinder barrel is caused, and the surface of the cylinder barrel or the piston is pulled to damage the hydraulic cylinder after long-term use.

Disclosure of Invention

The present invention aims to overcome the drawbacks of the prior art and to solve the above problems, in part or in whole, by providing a hydraulic cylinder sealing device.

The purpose of the utility model is realized by the following technical scheme.

A hydraulic cylinder seal assembly comprising: a piston and seal assembly; the sealing assembly consists of a sealing element and an elastic ring;

the elastic ring is arranged in a sealing ring groove of the piston, and a sealing piece is arranged on the elastic ring to realize sealing between the piston and the cylinder barrel; the elastic ring is matched with the sealing ring groove in size; and a liquid circulation hole is formed in the contact end of the elastic ring mounting position on the piston and the liquid level of the piston, so that liquid can flow into the sealing ring groove under the action of pressure to extrude the elastic ring outwards and extrude the sealing element.

Preferably, the elastic ring is made of a hard material.

Preferably, the elastic ring is made of copper.

Preferably, the liquid flow hole has a right-angled shape.

Preferably, the liquid flow hole is formed at a position axially intermediate the seal ring groove.

Preferably, the sealing element is an O-ring or a composite seal assembly.

Preferably, the composite seal assembly is comprised of an anti-extrusion ring, a wear ring, and a rubber body.

Advantageous effects

Compared with the prior art, the utility model reduces the pressure between the sealing device and the cylinder barrel during no-load operation, reduces the sliding friction loss to a certain extent, further effectively improves the efficiency of the hydraulic cylinder, and in addition, prolongs the aging life of the rubber ring and prolongs the service life of the hydraulic cylinder by reducing the pressure between the sealing device and the cylinder barrel.

Drawings

FIG. 1 is a schematic view of a hydraulic cylinder assembly;

FIG. 2 is a schematic view of the assembled relationship of the composite seal assembly and the elastomeric ring;

FIG. 3 is a cross-sectional view of the piston;

FIG. 4 is a cross-sectional view of the cylinder barrel;

reference numerals: 1-closed end cover, 2-cylinder barrel, 201-water inlet, 202-water outlet, 3-support ring, 4-sealing component, 401-anti-extrusion ring, 402-wear-resistant ring, 403-rubber body, 404-elastic ring, 5-piston, 501-liquid circulation hole, 6-locking ring, 7-ceramic rod and 8-open end cover.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art in light of these embodiments are intended to be within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the utility model. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

For the purpose of illustrating the objects, technical solutions and advantages of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Example 1

As shown in fig. 1, a hydraulic cylinder sealing apparatus includes: a piston 5 and a seal assembly 4; the seal assembly consists of a seal and an elastomeric ring 404;

the elastic ring 404 is arranged in a seal ring groove of the piston 5, and a seal is arranged on the elastic ring to realize the seal between the piston 5 and the cylinder barrel 2; the elastomeric ring 404 is sized to match the seal ring groove; the contact end of the elastic ring mounting position on the piston 5 and the liquid surface of the piston 5 is provided with a liquid circulation hole 501, so that the liquid can flow into the sealing ring groove under the action of pressure to extrude the elastic ring 404 outwards and further extrude the sealing element.

As shown in fig. 3, the piston is a stepped rotary shaft type structure, a stepped hole is formed in the core part at the right end for placing a ceramic rod 7 and a locking ring 6, a sealing ring groove with a rectangular cross section is formed in the outer diameter of the middle part, supporting ring grooves are formed in two sides of the sealing ring groove, the area of the supporting ring grooves is smaller than that of the sealing ring groove, a liquid circulation hole 501 is formed between a liquid contact end at the left end and the sealing ring groove, and for convenience of machining, a right-angle hole is formed in the embodiment, and the axial length is slightly smaller than half of the length of the piston but the end point position is required to be located right below the sealing ring groove. In order to quickly and uniformly distribute the liquid between the elastic ring 404 and the seal ring groove, the position of the circulation hole in the seal ring groove is the axial middle position.

The support ring is a tetrafluoroethylene annular ring, the cross section of the support ring is rectangular, the axial length of the support ring is consistent with that of a support ring groove formed in the piston 5, the height of the support ring is slightly higher than that of the support ring groove formed in the piston 5, and the outer diameter of the final formed support ring is smaller than the inner diameter of the cylinder barrel.

In order to resist the liquid leakage caused by deformation, the elastic ring 404 is made of hard material, and has a rectangular cross section, the axial length of the elastic ring is consistent with the axial length of a sealing ring groove formed on the piston 5, and the outer diameter of the elastic ring is consistent with the inner diameter of the sealing element.

Preferably, in order to improve the corrosion resistance and the coefficient of resilience of the elastic ring, the elastic ring is made of copper.

Preferably, the sealing element is an O-ring or a composite seal assembly.

Preferably, as shown in fig. 2, the composite seal assembly is comprised of an anti-extrusion ring 401, a wear ring 402, and a rubber body 403.

The rubber body 403 is a stepped ring, two ends of the outer diameter part are provided with annular grooves with rectangular sections for placing anti-extrusion rings, and the axial length of the inner diameter part is consistent with that of a sealing ring groove arranged on the piston 5.

The anti-extrusion ring 401 is a tetrafluoroethylene annular ring, the cross section of the anti-extrusion ring is rectangular, the axial length of the anti-extrusion ring is consistent with the axial length of the anti-extrusion ring arranged at the two ends of the rubber body 403, the height of the anti-extrusion ring is slightly higher than the annular grooves arranged at the two ends of the rubber body, but the final formed outer diameter is ensured to be smaller than the inner diameter of the cylinder barrel.

The wear-resistant ring 402 is a tetrafluoroethylene annular ring, the cross section of the wear-resistant ring is rectangular, the axial length of the wear-resistant ring is consistent with the axial length of the outer diameter of the rubber body 403, and the outer diameter of the wear-resistant ring is slightly larger than the inner diameter of the cylinder 2 and is used for forming pre-pressure between the rubber body 403 and the cylinder 2.

The assembling process comprises the following steps: firstly, a sealing assembly 4 is installed, an elastic ring 404 is placed in a sealing ring groove formed in a piston 5, then a rubber body 403 is placed on the outer side of the elastic ring 404, anti-extrusion rings 401 are placed on two sides of the rubber body 403, a wear-resisting ring 402 is placed on the outer side of the rubber body, then a support ring 3 is placed in a support ring groove formed in the piston 5, a ceramic rod 7 is placed in a stepped hole formed in the piston, the ceramic rod is completely locked to the piston 5 through a locking ring 6, the assembled piston assembly is placed in a cylinder barrel 2, and two ends of the assembled piston assembly are respectively sealed through a closed end cover 1 and an open end cover 8.

The mechanism of motion of the present invention is illustrated below:

when the piston assembly is ready to move from the open end cover 8 to the closed end cover 1, the water inlet 201 is opened, the water outlet 202 is closed, as shown in fig. 4, after the water inlet 201 is closed after the piston assembly is filled with liquid, the piston assembly starts to move under stress, at the moment, the liquid pressure gradually rises along with the reduction of the liquid volume in the cylinder barrel, the pressure of the liquid is guided to the lower part of the elastic ring 404 through the liquid circulation hole 501 in the piston 5, the elastic ring 404 starts to move towards the outer diameter direction after bearing the pressure, and the rubber body 403, the anti-extrusion ring 401 and the wear-resistant ring 402 are extruded, so that the pressure between the wear-resistant ring 402 and the cylinder barrel 2 is increased, and sealing is realized.

When the piston assembly is ready to move from the closed end cover 1 to the open end cover 8, the water outlet 202 is opened, the water inlet 201 is closed, the water outlet 202 is closed after the pressure returns, the water inlet 201 is opened, the piston assembly starts to move, at the moment, along with the return of the cylinder pressure, the pressure at the lower part of the elastic ring 404 is guided to the inside of the cylinder barrel 2 through the liquid circulation hole 501 in the piston 5, the elastic ring 404 starts to move towards the inner diameter direction after the pressure is reduced, the rubber body 403, the anti-extrusion ring 401 and the wear-resisting ring 402 simultaneously move towards the inner diameter direction, the pressure between the wear-resisting ring 402 and the cylinder barrel is reduced, the sliding friction between the wear-resisting ring and the cylinder barrel is further reduced, the efficiency of the hydraulic cylinder is effectively improved, in addition, the aging life of the rubber ring is prolonged by reducing the pressure between the sealing device and the cylinder barrel, and the service life of the hydraulic cylinder is prolonged.

In order to illustrate the contents and embodiments of the present invention, specific examples are given herein. The details introduced in the examples are not intended to limit the scope of the claims but to assist in understanding the present invention. Those skilled in the art will understand that: although the description is given in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art will recognize that the embodiments described herein may be combined as a whole to form other embodiments as would be understood by those skilled in the art. And that various modifications, changes, or alterations to the steps of the preferred embodiments are possible without departing from the spirit and scope of the utility model and appended claims. Therefore, the present invention should not be limited to the disclosure of the preferred embodiments and the accompanying drawings.

Claims

1. A kind of hydraulic cylinder sealing means, characterized by: a piston (5) and a seal assembly (4); the seal assembly is composed of a seal and an elastomeric ring (404);

the elastic ring (404) is arranged in a seal ring groove of the piston (5), and a seal is arranged on the elastic ring to realize the seal between the piston (5) and the cylinder barrel (2); the elastomeric ring (404) is sized to match the seal ring groove; and a liquid circulation hole (501) is formed in the contact end of the elastic ring mounting position on the piston (5) and the liquid level of the piston (5), so that liquid can flow into the sealing ring groove under the action of pressure to extrude the elastic ring (404) outwards so as to extrude the sealing element.

2. The apparatus of claim 1, wherein: the elastic ring (404) is made of a hard material.

3. The apparatus of claim 2, wherein: the elastic ring (404) is made of copper.

4. The apparatus according to any one of claims 1-3, wherein: the liquid circulation hole (501) is right-angled.

5. The apparatus of claim 4, wherein: the liquid flowing hole (501) is arranged at the axial middle position of the sealing ring groove.

6. The apparatus of claim 5, wherein: the sealing element is an O-shaped sealing ring or a combined sealing component.

7. The apparatus of claim 6, wherein: the composite seal assembly is composed of an anti-extrusion ring (401), a wear-resistant ring (402) and a rubber body (403).