Wear-resistant sealing element with long service life

Abstract

The utility model discloses a long-life wear-resistant sealing element, which comprises an inner rubber sleeve and an outer sheath, the outer sheath is sleeved on the outer side of the inner rubber sleeve, a first connecting disc and a second connecting disc are connected between the inner rubber sleeve and the outer sheath, the first connecting disc and the second connecting disc are connected through two tension components, the cross section of the inner rubber sleeve and the cross section of the outer sheath are each of a wave-shaped structure, a plurality of abrasion-resistant rings are arranged on the inner side of the inner rubber sleeve, the abrasion-resistant rings are polytetrafluoroethylene coatings, the abrasion-resistant rings are bonded and fixed to the wave crest positions of the inner side of the inner rubber sleeve, and an annular gap is formed between the inner rubber sleeve and the outer sheath. Two tension assemblies are symmetrically arranged in the annular gap, a plurality of wave crests on the outer side of the outer sheath make close contact with the outer wall of the space to be sealed, a plurality of wave crests on the inner side of the inner rubber sleeve make close contact with the inner wall of the space to be sealed, a multi-layer sealing structure can be formed, and the situation that leakage is caused by failure of a single-layer sealing structure can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of seals, in particular to a high-life wear-resistant seal. Background Technique

[0002] A dynamic seal is an element for realizing dynamic sealing, and dynamic sealing refers to the sealing between relatively moving parts in a machine (or equipment). Dynamic seals are divided into two categories: reciprocating dynamic seals and rotary dynamic seals. Reciprocating dynamic seals include molded packing seals, stuffing box seals, and expansion ring seals. Dynamic seals can be divided into two basic forms: rotary seals and reciprocating seals. According to whether the sealing conditions are in contact with the parts moving relative to them, they can be divided into contact seals and non-contact seals. Generally speaking, contact seals have good sealing performance, but are limited by frictional damage and are suitable for occasions with relatively low linear speeds of the sealing surface. Non-contact seals have poor sealing performance and are suitable for higher speeds.

[0003] Chinese Patent Publication No. CN217481837U discloses a rubber seal for an automotive oil seal, which includes a rubber seal body. The rubber seal body is composed of a base layer, a wear-resistant layer, and a heat-resistant layer. The base layer is located on top of the wear-resistant layer, and the wear-resistant layer is located on top of the heat-resistant layer. Through the mutual cooperation of the wear-resistant layer, the acrylic polyurethane paint layer, the epoxy coal tar paint layer, and the polyacrylonitrile fiber layer, when the rubber seal is in use, it can play a wear-resistant role for the rubber seal, avoiding the situation that the existing rubber seal does not have a wear-resistant function when in use, resulting in large wear of the rubber seal during long-term use and causing the rubber seal to be unable to be used normally.

[0004] The seals in the above technologies mainly rely on the characteristics of rubber materials to provide elastic force to achieve wear-resistant sealing. However, the elastic force of rubber materials is limited. After the seals are used for a long time, as the wear amount continues to increase, this leads to a reduction in the sealing pressure and there is a great risk of leakage. Therefore, the present utility model discloses a high-life wear-resistant seal to solve the above problems. Content of the Utility Model

[0005] The purpose of the present utility model is to provide a high-life wear-resistant seal to solve the problem that the traditional seals mainly rely on the characteristics of rubber materials to provide elastic force to achieve wear-resistant sealing. However, the elastic force of rubber materials is limited. After the seals are used for a long time, as the wear amount continues to increase, this leads to a reduction in the sealing pressure and there is a great risk of leakage as mentioned in the above background technique.

[0006] To achieve the above purpose, the solution of the present utility model to solve the above technical problems is as follows:

[0007] A high - life wear - resistant seal, comprising an inner rubber sleeve and an outer sheath. The outer sheath is sleeved on the outside of the inner rubber sleeve. A first connecting disk and a second connecting disk are connected between the inner rubber sleeve and the outer sheath. The first connecting disk and the second connecting disk are connected by two tension components. Among them, the cross - sections of the inner rubber sleeve and the outer sheath are both in a wavy structure, and a plurality of wear - resistant rings are arranged on the inner side of the inner rubber sleeve. The wear - resistant rings are polytetrafluoroethylene coatings.

[0008] As a further scheme of the utility model, the wear - resistant rings are adhesively fixed at the wave crest positions on the inner side of the inner rubber sleeve.

[0009] As a further scheme of the utility model, an annular gap is formed between the inner rubber sleeve and the outer sheath, and two tension components are symmetrically arranged in the annular gap.

[0010] As a further scheme of the utility model, the tension component includes a column rod fixed on the first connecting disk and a column cylinder fixed on the second connecting disk. One end of the column cylinder is thread - connected with an end cover. The end of the column rod far from the first connecting disk passes through the end cover and extends into the column cylinder and is thread - connected with a nut. A spring is sleeved on the outer side of the column rod and between the end cover and the nut.

[0011] As a further scheme of the utility model, expansion rings are arranged on the edges of the mutually - remote sides of the first connecting disk and the second connecting disk. C - rings are arranged at both ends of the inner rubber sleeve and the outer sheath. The C - rings cover the outside of the adjacent expansion rings.

[0012] As a further scheme of the utility model, sealant is filled in the gap between the expansion ring and the C - ring.

[0013] As a further scheme of the utility model, both the inner rubber sleeve and the outer sheath are made of rubber materials.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. For the high - life wear - resistant seal of the utility model, a plurality of wave crests on the outside of the outer sheath are in close contact with the outer wall of the space to be sealed, and a plurality of wave crests on the inner side of the inner rubber sleeve are in close contact with the inner wall of the space to be sealed, which can form a multi - layer sealing structure, can avoid the leakage caused by the failure of the single - layer sealing structure, and reduces the leakage risk.

[0016] 2. The high - life and wear - resistant seal of the present utility model is such that the inner rubber sleeve and the outer sheath can rely on their own elasticity to make up for the wear amount, and the spring pushes the nut away from the end cover, making the first connection plate and the second connection plate tend to approach each other. The first connection plate and the second connection plate squeeze the inner rubber sleeve and the outer sheath to deform, so that after the seal is worn, it can be compensated by its own elasticity, maintain close contact with the power output shaft, maintain the sealing effect, and ensure the sealing ability.

[0017] 3. For the high - life and wear - resistant seal of the present utility model, since the outer side of the inner rubber sleeve is coated with a wear - resistant ring, this greatly improves the wear - resistant ability of the inner rubber sleeve, extends the service life of the seal, and the wear - resistant ring is only used at the wave - peak positions on the inner side of the inner rubber sleeve. This makes the wear resistance enhanced in the areas where it is most needed, rather than using wear - resistant materials for the whole seal, thus saving costs. Brief Description of the Drawings

[0018] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0019] Figure 1 is the external view of a high - life and wear - resistant seal of the present utility model;

[0020] Figure 2 is the cross - sectional view of a high - life and wear - resistant seal of the present utility model;

[0021] Figure 3 is the enlarged view of the structure at A in the attached Figure 2 of a high - life and wear - resistant seal of the present utility model;

[0022] Figure 4 is the enlarged view of the structure at B in the attached Figure 2 of a high - life and wear - resistant seal of the present utility model;

[0023] Figure 5 is the structural diagram of the second connection plate in a high - life and wear - resistant seal of the present utility model;

[0024] Figure 6 is the cross - sectional view of the outer sheath in a high - life and wear - resistant seal of the present utility model.

[0025] In the drawings, the list of components represented by each reference numeral is as follows: 1, inner rubber sleeve; 2, outer sheath; 3, first connection plate; 4, second connection plate; 5, tension assembly; 6, wear - resistant ring; 7, expansion ring; 8, C - ring; 51, column rod; 52, column cylinder; 53, end cover; 54, nut; 55, spring. Detailed Embodiments

[0026] The following further describes the present utility model in conjunction with embodiments.

[0027] Please refer toFigures 1-6 , the present utility model provides a high - life and wear - resistant seal, which includes an inner rubber sleeve 1 and an outer sheath 2, and both the inner rubber sleeve 1 and the outer sheath 2 are made of rubber material;

[0028] Specifically, the use of rubber material is crucial in the design of the seal because it can provide sufficient elasticity to adapt to the sealed spaces of different shapes. And after the seal wears, the elasticity of the rubber can help compensate for the worn amount and maintain the sealing effect. In addition, the rubber material also has good anti - aging and anti - corrosion properties, which helps to ensure the overall durability and service life of the seal.

[0029] Furthermore, an outer sheath 2 is sleeved on the outer side of the inner rubber sleeve 1, and an annular gap is formed between the inner rubber sleeve 1 and the outer sheath 2. Two tension components 5 are symmetrically arranged in the annular gap;

[0030] Specifically, the symmetrical arrangement of the tension components 5 helps to maintain the stability of the seal structure, preventing the deformation or damage of the seal caused by asymmetric stress. By symmetrically arranging two tension components 5 in the annular gap, the force can be transmitted more evenly to the inner rubber sleeve 1 and the outer sheath 2, thus avoiding local stress concentration and improving the overall performance and durability of the seal. The existence of the annular gap allows the inner rubber sleeve 1 and the outer sheath 2 to undergo appropriate deformation under the action of the force of the tension components 5, which helps them to fit more closely to the inner and outer walls of the sealed space, thereby improving the sealing effect. The spring 55 in the tension component 5 can provide the necessary elasticity for the seal, so that when the seal wears or under different working conditions, the inner rubber sleeve 1 and the outer sheath 2 can compensate through their own elasticity and maintain the sealing performance.

[0031] Furthermore, a first connection disk 3 and a second connection disk 4 are connected between the inner rubber sleeve 1 and the outer sheath 2. Expansion rings 7 are arranged at the edges of the sides of the first connection disk 3 and the second connection disk 4 that are away from each other. C - rings 8 are arranged at both ends of the inner rubber sleeve 1 and the outer sheath 2, and the C - rings 8 cover the outside of the adjacent expansion rings 7;

[0032] Specifically, the C - ring 8 covering the outside of the expansion ring 7 has a certain anti - detachment effect and can facilitate the assembly of the inner rubber sleeve 1, the outer sheath 2 with the first connection disk 3 or the second connection disk 4. This design helps to form a more compact sealing surface, increases the sealing contact surface, and improves the sealing effect.

[0033] Furthermore, a sealing glue is filled in the gap between the expansion ring 7 and the C - ring 8;

[0034] Specifically, the sealant can fill the tiny gap between the expansion ring 7 and the C-ring 8, thereby providing a more airtight sealing effect, preventing leakage, and having a certain elasticity to adapt to dimensional changes caused by temperature variations or mechanical vibrations, maintaining close contact between the seal and the sealing surface.

[0035] Furthermore, the first connection plate 3 and the second connection plate 4 are connected by two tension components 5. The tension component 5 includes a column rod 51 fixed on the first connection plate 3 and a column cylinder 52 fixed on the second connection plate 4. One end of the column cylinder 52 is threadedly connected with an end cap 53. The end of the column rod 51 away from the first connection plate 3 passes through the end cap 53 and extends into the column cylinder 52 to be threadedly connected with a nut 54. A spring 55 is sleeved on the outer side of the column rod 51 and between the end cap 53 and the nut 54.

[0036] Specifically, during installation, the end cap 53 and the spring 55 are successively sleeved on the outer side of the column rod 51, and then the nut 54 is screwed to be threadedly connected with the column rod 51. After that, the end of the column rod 51 with the nut 54 is inserted into the column cylinder 52, and the end cap 53 is screwed to be threadedly connected with the column cylinder 52. Under the elastic force of the spring 55, the spring 55 pushes the nut 54 away from the end cap 53, making the first connection plate 3 and the second connection plate 4 tend to approach each other. The first connection plate 3 and the second connection plate 4 squeeze the inner rubber sleeve 1 and the outer sheath 2 to deform, improving the elastic capacity of the seal. During the installation process, the distance between the nut 54 and the end cap 53 can determine the compression amount of the spring 55, thereby controlling the elastic force of the spring 55. Therefore, under the working conditions of a large internal and external pressure difference, by shortening the distance between the nut 54 and the end cap 53, the deformation amount of the inner rubber sleeve 1 and the outer sheath 2 can be increased, and thus the sealing pressure can be improved. It should be noted that the sealing pressure will increase the friction force between the seal and the power output shaft, increasing the loss. Therefore, the adjustment of the sealing pressure needs to be adjusted according to the actual working conditions to prevent the sealing pressure from being too large and affecting the movement of the power output shaft.

[0037] Furthermore, the cross-sections of the inner rubber sleeve 1 and the outer sheath 2 are both in a wavy structure, and a plurality of wear-resistant rings 6 are arranged on the inner side of the inner rubber sleeve 1. The wear-resistant rings 6 are polytetrafluoroethylene coatings.

[0038] Specifically, the setting of the wear-resistant rings 6 helps to reduce the wear of the inner rubber sleeve 1 during movement and extend the service life of the seal. The wavy structure can provide more contact points, and the seal can form a multi-point contact ring with the inner and outer walls of the space to be sealed, thereby enhancing the sealing effect and reducing the possibility of leakage. Moreover, the wavy structure has a certain elasticity and can, to a certain extent, compensate for dimensional changes caused by wear or other factors and maintain the sealing performance. Polytetrafluoroethylene is famous for its excellent wear resistance, chemical stability, and low friction coefficient. Therefore, it can significantly improve the wear resistance of the seal.

[0039] Furthermore, the wear-resistant ring 6 is adhesively fixed at the peak position on the inner side of the inner rubber sleeve 1;

[0040] Specifically, the use of the wear-resistant ring 6 helps to reduce the wear of the inner rubber sleeve 1, thereby maintaining the sealing performance of the seal, preventing the sealing performance from decreasing or leaking due to wear. The peak position is the area where the seal contacts the power output shaft most frequently and closely, so it is also the place most vulnerable to wear. By adhesively fixing the wear-resistant ring 6 in these key areas, the inner rubber sleeve 1 can be effectively protected and its service life can be extended. By using wear-resistant materials only at the peak positions on the inner side of the inner rubber sleeve 1 instead of on the entire seal, cost can be saved while still achieving the required wear-resistant performance.

[0041] Working principle: During use, the seal is limited between the seal groove and the power output shaft. Multiple peaks on the outer side of the outer sheath 2 are in close contact with the inner wall of the seal groove, and multiple peaks on the inner side of the inner rubber sleeve 1 are in close contact with the power output shaft, capable of forming a multi-layer sealing structure with good anti-leakage effect. Since the outer side of the inner rubber sleeve 1 is coated with the wear-resistant ring 6, this greatly improves the wear resistance of the inner rubber sleeve 1 and extends the service life of the seal. And once wear occurs, the inner rubber sleeve 1 and the outer sheath 2 can rely on their own elasticity to compensate for the wear amount, avoiding the possibility of leakage. The spring 55 pushes the nut 54 away from the end cover 53, making the first connection disk 3 and the second connection disk 4 tend to approach each other. The first connection disk 3 and the second connection disk 4 squeeze the inner rubber sleeve 1 and the outer sheath 2 to deform, improving the elastic capacity of the seal, so that the seal groove and the power output shaft can both keep in close contact with the seal, ensuring the sealing ability.

Claims

1. A high-life and wear-resistant seal, characterized in that It includes an inner rubber sleeve (1) and an outer sheath (2). The outer sheath (2) is sleeved on the outside of the inner rubber sleeve (1). A first connecting disc (3) and a second connecting disc (4) are connected between the inner rubber sleeve (1) and the outer sheath (2). The first connecting disc (3) and the second connecting disc (4) are connected by two tension components (5). Among them, the cross-sections of the inner rubber sleeve (1) and the outer sheath (2) are both in a wavy structure, and a plurality of wear-resistant rings (6) are arranged on the inner side of the inner rubber sleeve (1). The wear-resistant rings (6) are polytetrafluoroethylene coatings.

2. The high - life wear - resistant seal according to claim 1, characterized in that: The wear-resistant rings (6) are adhesively fixed at the peak positions on the inner side of the inner rubber sleeve (1).

3. A high-life wear-resistant seal according to claim 1, characterized in that: An annular gap is formed between the inner rubber sleeve (1) and the outer sheath (2), and two tension components (5) are symmetrically arranged in the annular gap.

4. A high-life wear-resistant seal according to claim 1, characterized in that: The tension component (5) includes a column rod (51) fixed on the first connecting disc (3) and a column barrel (52) fixed on the second connecting disc (4). One end of the column barrel (52) is threadedly connected with an end cover (53). The end of the column rod (51) away from the first connecting disc (3) passes through the end cover (53) and extends into the column barrel (52) and is threadedly connected with a nut (54). A spring (55) is sleeved on the outer side of the column rod (51) and between the end cover (53) and the nut (54).

5. A high-life and wear-resistant seal according to claim 1, characterized in that: Expansion rings (7) are arranged on the edges of the mutually remote sides of the first connecting disc (3) and the second connecting disc (4). C-shaped rings (8) are arranged at both ends of the inner rubber sleeve (1) and the outer sheath (2). The C-shaped rings (8) cover the outside of the adjacent expansion rings (7).

6. A high-life wear-resistant seal according to claim 5, characterized in that: Sealant is filled in the gap between the expansion ring (7) and the C-shaped ring (8).

7. A high - lifespan and wear - resistant seal according to claim 1, characterized in that: Both the inner rubber sleeve (1) and the outer sheath (2) are made of rubber material.

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