CN220748691U - Hydraulic cylinder - Google Patents

Abstract

The utility model discloses a hydraulic cylinder, which belongs to the technical field of hydraulic cylinders and comprises a piston cylinder and a piston arranged in the piston, wherein a sealing ring is arranged on the outer wall of the piston, the piston is in sliding connection with the piston cylinder through the sealing ring.

Description

Hydraulic cylinder

Technical Field

The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder.

Background

The hydraulic cylinder is an important hydraulic device, and is widely applied to various industrial fields, the core parts of the hydraulic cylinder are a piston cylinder and a piston, and the piston slides in the piston cylinder by pushing hydraulic oil, so that energy conversion and transmission are realized. In order to ensure the tightness of the hydraulic oil, a seal, such as a conventional rubber seal, is usually provided between the piston and the piston cylinder. However, as the service life increases and the piston moves through wear, the seals gradually fail, resulting in leakage of hydraulic oil (hydraulic oil from the drive end of the piston cylinder to its non-drive end).

For leakage of hydraulic oil, the traditional treatment mode is to replace a sealing element, but the method needs to be stopped for maintenance, and the maintenance cost of equipment is increased. In order to solve the problem, patent (such as CN202123292595.7, a leak-proof hydraulic cylinder for a lift and a cylinder thereof) proposes that an expansion ring is arranged inside a sealing member, when the sealing member is damaged by a crack, hydraulic oil can enter the sealing ring along the crack to contact with the expansion ring, and then the expansion ring absorbs oil and expands, so that the sealing effect is enhanced, and the service life of the sealing member is prolonged. However, the trigger mechanism for this approach is that the seal ages and cracks, and leakage due to wear thinning of the seal is more common for some frequently used hydraulic rams. Therefore, there is a need for improvements to existing hydraulic rams to extend their life.

Disclosure of Invention

In order to solve the defects of the prior art, the utility model provides a hydraulic oil cylinder, wherein at least two sealing rings are arranged on the peripheral side wall of a piston, an expansion ring which expands after imbibition is arranged between the sealing rings, hydraulic oil enters the expansion ring after leakage, so that the expansion ring expands and extrudes the sealing rings, the sealing rings are extruded to expand radially, the sealing effect is enhanced, and the sealing period is prolonged.

The specific scheme of the utility model is as follows:

the utility model relates to a hydraulic oil cylinder, which comprises a piston cylinder and a piston arranged in the piston, wherein the outer wall of the piston is provided with a sealing ring, the piston is in sliding connection with the piston cylinder through the sealing ring, the outer wall of the piston is provided with at least two sealing rings, and the hydraulic oil cylinder also comprises an expansion ring which is positioned between the sealing rings and expands after absorbing oil.

As a specific embodiment of the present utility model, a portion of the expansion ring is located inside the seal ring.

As a specific implementation mode of the utility model, the outer wall of the expansion ring is provided with a limiting ring used for limiting the radial outward expansion of the part of the expansion ring between the two sealing rings, and the limiting ring is provided with a through hole which radially penetrates through the body.

Further, the outer diameter of the limiting ring is smaller than the outer diameter of the sealing ring.

As a specific implementation mode of the utility model, at least two expansion rings are arranged, and each expansion ring is respectively matched with two sealing rings.

Compared with the prior art, the utility model has the following advantages:

according to the utility model, at least two sealing rings are arranged on the outer wall of the piston, an annular cavity for collecting leaked hydraulic oil is formed between the sealing rings, and the expansion ring is arranged in the annular cavity so as to be convenient for absorbing the hydraulic oil to expand, so that the sealing rings are extruded to expand radially outwards to enhance the sealing effect, the sealing performance of the sealing rings, which is reduced due to abrasion, can be compensated, and the sealing period can be prolonged.

Drawings

FIG. 1 is a partial cross-sectional view of a hydraulic ram according to example 1 of the present utility model;

FIG. 2 is an enlarged view of part of the portion A of FIG. 1;

FIG. 3 is a partial cross-sectional view of the hydraulic ram of example 2 of the present utility model;

FIG. 4 is an enlarged view of a portion B of FIG. 3;

wherein, the piston cylinder 100, the piston 200, the piston rod 300,

A driving end 110, a non-driving end 120,

Sealing ring 210, expansion ring 220, stop collar 230.

Detailed Description

The present utility model will be described in further detail with reference to examples and drawings, but embodiments of the present utility model are not limited thereto.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and should not be construed as limiting the present utility model.

Example 1

Referring to fig. 1-2, the hydraulic cylinder of the present embodiment includes a piston cylinder 100, a piston 200, and a piston rod 300, wherein the piston cylinder 100 is cylindrical, and one end of the piston rod 300 passes through the piston cylinder 100 and is fixedly connected with the piston 200; the piston 200 is arranged in the piston cylinder 100 and is in sliding sealing connection with the inner wall of the piston cylinder 100, so that the piston cylinder 100 is divided into a driving end 110 and a non-driving end 120, an oil path interface is arranged on the piston cylinder 100, the piston 200 can be pushed to move upwards in the axial direction after hydraulic oil is injected into the driving end 110, the hydraulic oil in the driving end 110 is discharged outwards, and the piston 200 can move downwards in the axial direction of the piston cylinder 100 under the action of self gravity.

Referring to fig. 2, two sealing rings 210 are disposed on the outer wall of the piston 200, the two sealing rings 210 are spaced apart by a certain distance, and an expansion ring 220 that expands after absorbing oil is disposed between the two sealing rings 210. In this embodiment, an annular cavity for collecting leaked hydraulic oil is formed between the two sealing rings 210, and the expansion ring 220 is placed in the annular cavity so as to absorb the hydraulic oil for expansion, so that the sealing rings 210 are extruded to expand radially outwards to enhance the sealing effect, which can compensate the reduced sealing performance of the sealing rings 210 due to abrasion, and prolong the sealing period.

In this embodiment, a part of the expansion ring 220 extends to the inner side of the sealing ring 210, and the cross section of the expansion ring 220 is T-shaped, so that after the expansion ring 220 expands, the sealing ring 200 can be extruded in both axial and radial directions, so that the sealing ring 200 expands radially outwards. In addition, in order to expand more parts of the expansion ring 220 to the inner side of the sealing ring 200 during expansion, thereby radially extruding the sealing ring 210, a limiting ring 230 is arranged on the outer wall of the expansion ring 220, for limiting the radial outward expansion of the middle part of the expansion ring 220, and a through hole radially penetrating through the body is arranged on the limiting ring 230, so that the leaked hydraulic oil can be conveniently contacted with the expansion ring 220. In addition, the outer diameter of the stop collar 230 is smaller than the outer diameter of the seal ring 200, so that the stop collar 230 does not contact the piston cylinder 100 during use, thereby reducing wear on the piston cylinder 100.

Example 2

Embodiment 2 differs from embodiment 1 in the number of seal rings 210, expansion rings 220, and stop rings 230, please refer to fig. 3 and 4. In this embodiment, there are two expansion rings 220, and each expansion ring 220 is respectively matched with two sealing rings 210 and a limiting ring 230, all the sealing rings 210 wear simultaneously in the initial stage, hydraulic oil firstly enters the first expansion ring 220 to expand after leaking, the sealing rings 230 on two sides of the first expansion ring 220 continue to seal after expanding, and when the sealing rings 230 on two sides of the first expansion ring 220 wear out again and fail, hydraulic oil enters the second expansion ring 230, so that the sealing rings on two sides of the second expansion ring 230 expand and play a sealing role, which can further increase the replacement period of the sealing rings. In addition, the seal ring in this embodiment adopts a rubber ring.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present utility model disclosed in the embodiments of the present utility model should be covered by the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims (6)

1. The hydraulic oil cylinder comprises a piston cylinder and a piston arranged in the piston, wherein a sealing ring is arranged on the outer wall of the piston, and the piston is in sliding connection with the piston cylinder through the sealing ring; the hydraulic cylinder also comprises at least one expansion ring which is positioned between the sealing rings and can expand after absorbing oil.

2. A hydraulic ram according to claim 1, wherein a portion of the expansion ring extends inside the seal ring.

3. The hydraulic cylinder according to claim 2, wherein the outer wall of the expansion ring is provided with a limiting ring for limiting the radial outward expansion of the part of the expansion ring between the sealing rings, and the limiting ring is provided with a through hole penetrating the body radially.

4. A hydraulic ram according to claim 3, wherein the outer diameter of the stop collar is smaller than the outer diameter of the seal ring.

5. A hydraulic ram according to claim 1, wherein there are at least two expansion rings, each expansion ring being associated with two sealing rings.

6. The hydraulic cylinder of claim 1, wherein the seal ring is a rubber ring.