Combined rubber sealing gasket

Abstract

The utility model relates to the technical field of sealing gaskets, in particular to a combined rubber sealing gasket which comprises a sealing gasket body and a through hole formed in the middle of the sealing gasket body, and the sealing gasket body comprises a PTFE sealing layer, a rubber elastic layer and a bottom abrasion-resistant layer which are sequentially arranged from top to bottom. The lower surface of the PTFE sealing layer is fixedly connected with a plurality of embedded teeth extending into the rubber elastic layer, the bonding strength of the PTFE layer and the rubber elastic layer is greatly enhanced through the embedded tooth structure, the problem of interface stripping failure under long-term thermal cycle and pressure fluctuation is effectively solved, the special polyurethane wear-resistant layer is additionally arranged at the bottom, wear-resistant particles are compounded, and the wear-resistant performance of the rubber elastic layer is improved. The wear resistance of the direct contact mounting surface of the sealing gasket is remarkably improved, the overall compressive strength and deformation resistance of the sealing gasket are remarkably enhanced through the built-in wavy supporting framework, and the sealing reliability, durability and working condition adaptability of the sealing gasket are comprehensively improved through the synergistic effect of all the functional layers.

Description

Technical Field

[0001] This utility model relates to the field of sealing gasket technology, and specifically discloses a combined rubber sealing gasket. Background Technology

[0002] Rubber gaskets are widely used static sealing elements in industrial equipment, typically made of a single rubber material or a composite structure, and are installed at connections such as flanges and valves to prevent fluid leakage. To improve sealing performance, composite gaskets have emerged in existing technologies. For example, a polytetrafluoroethylene (PTFE) layer is laminated onto the rubber matrix surface to reduce the coefficient of friction, or a metal skeleton is added internally to enhance pressure resistance. This type of structure balances elastic sealing with wear resistance through material combinations, making it suitable for medium- and low-pressure applications such as pipelines and pressure vessels.

[0003] However, existing rubber gaskets only bond the PTFE layer and the rubber layer through planar adhesion. Under long-term thermal cycling or pressure fluctuations, the interface is prone to peeling, leading to sealing failure. The bottom of the gasket directly contacts the mounting surface. Traditional rubber materials have insufficient wear resistance, which accelerates wear, especially under frequent vibration conditions, shortening the service life. At the same time, the gasket has poor deformation resistance and is difficult to adapt to environments with high sealing pressure. Utility Model Content

[0004] This invention proposes a combined rubber sealing gasket, which significantly enhances the bonding strength between the PTFE layer and the rubber elastic layer through an interlocking tooth structure. This effectively solves the problem of interface peeling failure under long-term thermal cycling and pressure fluctuations, and comprehensively improves the sealing reliability, durability and adaptability of the gasket.

[0005] This utility model is implemented as follows: a combined rubber sealing gasket includes a sealing gasket body and a through hole opened in the middle of the sealing gasket body. The sealing gasket body includes a PTFE sealing layer, a rubber elastic layer and a bottom wear-resistant layer arranged sequentially from top to bottom. The lower surface of the PTFE sealing layer is fixedly connected with a plurality of interlocking teeth extending into the rubber elastic layer. The interior of the rubber elastic layer is fixedly connected with a support skeleton.

[0006] As a preferred embodiment of the combined rubber sealing gasket of this utility model, the rubber elastic layer is one of fluororubber, hydrogenated nitrile rubber or EPDM rubber.

[0007] As a preferred embodiment of the combined rubber sealing gasket of this utility model, the bottom wear-resistant layer is polyurethane rubber.

[0008] As a preferred embodiment of the combined rubber sealing gasket of this utility model, the supporting frame is a spring steel wire woven mesh with a wavy cross-section.

[0009] In a preferred embodiment of this utility model of a combined rubber sealing gasket, the PTFE sealing layer, the rubber elastic layer, and the bottom wear-resistant layer are all bonded together with an adhesive between adjacent layers.

[0010] As a preferred embodiment of the combined rubber sealing gasket of this utility model, the lower end face of the bottom wear-resistant layer is fixedly connected with a plurality of uniformly distributed wear-resistant particles.

[0011] As a preferred embodiment of the combined rubber sealing gasket of this utility model, the upper surface of the sealing gasket body is an arc-shaped concave surface.

[0012] The beneficial effects of this utility model are:

[0013] This invention significantly enhances the bonding strength between the PTFE layer and the rubber elastic layer through an interlocking tooth structure, effectively solving the problem of interface delamination failure under long-term thermal cycling and pressure fluctuations. A dedicated polyurethane wear-resistant layer with composite wear-resistant particles is added to the bottom, significantly improving the wear resistance of the gasket's direct contact mounting surface, making it particularly suitable for vibration conditions and extending its service life. The built-in wave-shaped support skeleton significantly enhances the overall compressive strength and deformation resistance of the gasket, enabling it to adapt to higher sealing pressure environments while maintaining necessary elasticity. The arc-shaped concave design on the upper surface optimizes pressure transmission and promotes a more uniform and reliable line seal formation. Through the synergistic effect of each functional layer, the sealing reliability, durability, and adaptability of the gasket are comprehensively improved. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0015] Figure 1 This is a front sectional view of the overall structure of this utility model;

[0016] Figure 2 This is a top view of the overall structure of this utility model;

[0017] Figure 3 This is a bottom view of the overall structure of this utility model.

[0018] The markings in the diagram are: 1. Sealing gasket body; 2. Through hole; 3. PTFE sealing layer; 4. Rubber elastic layer; 5. Bottom wear-resistant layer; 6. Interlocking teeth; 7. Support skeleton; 8. Wear-resistant particles. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0020] Please see Figure 1-3 A composite rubber gasket includes a gasket body 1 and a through hole 2 opened in the middle of the gasket body 1. The gasket body 1 includes a PTFE sealing layer 3, a rubber elastic layer 4 and a bottom wear-resistant layer 5 arranged sequentially from top to bottom. The lower surface of the PTFE sealing layer 3 is fixedly connected with a plurality of interlocking teeth 6 extending into the rubber elastic layer 4. The interior of the rubber elastic layer 4 is fixedly connected with a support skeleton 7.

[0021] In this embodiment: the sealing gasket body 1 has a through hole 2 in the middle, which forms the basis of the sealing structure.

[0022] The PTFE sealing layer 3, as the top layer, utilizes its extremely low coefficient of friction and excellent chemical inertness to provide a smooth sliding sealing surface and resist media corrosion. Multiple downward interlocking teeth 6 are provided on its lower surface, penetrating deep into the interior of the rubber elastic layer 4, significantly enhancing the mechanical interlock between the PTFE sealing layer 3 and the rubber elastic layer 4, and effectively resisting interface peeling caused by thermal cycling and pressure fluctuations.

[0023] The rubber elastic layer 4 is located in the middle and is made of one of the following materials: fluororubber, hydrogenated nitrile rubber, or EPDM rubber. It provides the necessary elastic deformation capacity to achieve initial sealing and can adapt to minor unevenness of the flange surface. A support skeleton 7 is fixed inside it. This skeleton greatly improves the overall compressive strength and rigidity of the gasket and resists excessive deformation under high sealing pressure. At the same time, the corrugated structure allows the skeleton to undergo moderate elastic deformation with the rubber layer without failure.

[0024] The bottom wear-resistant layer 5 is located at the bottom and is made of high wear-resistant polyurethane rubber. It directly contacts the mounting flange surface and is specifically designed to solve the problem of easy wear on the bottom of traditional rubber. In particular, it can withstand frequent vibration and friction during equipment operation. Multiple evenly distributed wear-resistant particles 8 are fixed on its lower end face to further disperse contact stress, reduce frictional heat, and greatly extend the service life of the bottom of the sealing gasket under harsh working conditions.

[0025] As a technical optimization of this utility model, the rubber elastic layer 4 is one of fluororubber, hydrogenated nitrile rubber or EPDM rubber.

[0026] In this embodiment: the rubber elastic layer 4 is located in the middle and is made of one of the following materials: fluororubber, hydrogenated nitrile rubber or EPDM rubber. It provides the necessary elastic deformation capacity to achieve initial sealing and can adapt to minor unevenness of the flange surface.

[0027] As a technical optimization of this utility model, the bottom wear-resistant layer 5 is made of polyurethane rubber.

[0028] In this embodiment: the bottom wear-resistant layer 5 is made of polyurethane rubber, which has good wear resistance and directly contacts the mounting flange surface. It is specifically designed to solve the problem of easy wear on the bottom of traditional rubber, and can withstand frequent vibration and friction during equipment operation.

[0029] As a technical optimization of this utility model, the support frame 7 is a spring steel wire woven mesh with a wavy cross-section.

[0030] In this embodiment: the spring steel wire provides high strength, the woven mesh structure facilitates bonding with rubber, the wavy cross section has good elasticity, and the wavy skeleton provides strong support to resist high pressure deformation while having a certain degree of compressibility and resilience. It can deform in tandem with the rubber elastic layer 4 without easily causing hard damage or permanent deformation, thus improving the overall flexibility and fatigue resistance of the sealing gasket.

[0031] As a technical optimization of this utility model, the PTFE sealing layer 3, the rubber elastic layer 4 and the bottom wear-resistant layer 5 are all bonded together by an adhesive.

[0032] In this embodiment, the PTFE sealing layer 3, the rubber elastic layer 4, and the bottom wear-resistant layer 5 are all bonded together by adhesive. Based on the mechanical interlocking provided by the interlocking teeth 6, chemical bonding is used to further strengthen the interlayer bonding strength, forming multiple protections and preventing interlayer peeling failure to the greatest extent.

[0033] As a technical optimization of this utility model, a plurality of uniformly distributed wear-resistant particles 8 are fixedly connected to the lower end face of the bottom wear-resistant layer 5.

[0034] In this embodiment, the wear-resistant particles protrude outwards, directly bearing friction, reducing the wear contact area of ​​the base material of the bottom wear-resistant layer 5, dispersing frictional heat and stress, and further improving wear resistance and anti-slip properties under extreme working conditions.

[0035] As a technical optimization of this utility model, the upper surface of the sealing gasket body 1 is an arc-shaped concave surface.

[0036] In this embodiment: during installation, the flange clamping force acts on the arc-shaped concave surface, which can more effectively convert the axial pressure into a radial expansion force on the PTFE sealing layer 3, making it fit more tightly and evenly against the mating flange surface, forming a more reliable line seal, and is beneficial to the uniformity of pressure distribution.

[0037] The working principle and usage process of this utility model are as follows: When the gasket is installed between flanges, the flange bolts apply axial clamping force. This force first acts on the arc-shaped concave structure on the upper surface of the gasket body 1. Due to the arc design, the axial pressure is partially converted into radial expansion force, driving the PTFE sealing layer 3 to expand outward, making its edges more tightly fit the upper flange sealing surface, forming an initial line contact sealing band. At the same time, the axial pressure compresses the entire gasket body 1 along the thickness direction. The rubber elastic layer 4 first undergoes elastic deformation, filling the microscopic unevenness of the flange sealing surface, achieving a basic elastic seal. The interlocking teeth 6 embedded inside move with the rubber deformation, but because they penetrate deep into the rubber... Internally, the PTFE sealing layer 3 is effectively anchored, preventing it from sliding or peeling off relative to the rubber elastic layer 4 under compression, thermal expansion and contraction, or pressure fluctuations. The support skeleton 7 is compressed when the rubber elastic layer 4 is deformed under pressure. Its wavy cross-section provides elastic support, limiting excessive compression deformation of the rubber elastic layer 4, ensuring sufficient sealing specific pressure under high sealing pressure, and preventing extrusion failure. The elasticity of the skeleton allows it to rebound with the rubber. The bottom wear-resistant layer 5 directly bears the contact pressure and relative movement with the lower flange mounting surface. Its highly wear-resistant matrix resists wear. The wear-resistant particles 8 on the lower surface serve as the first contact point, bearing most of the friction, protecting the matrix of the bottom wear-resistant layer 5 and reducing frictional resistance.

[0038] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A composite rubber sealing gasket, comprising a sealing gasket body (1) and a through hole (2) formed in the middle of the sealing gasket body (1), characterized in that: The sealing gasket body (1) includes a PTFE sealing layer (3), a rubber elastic layer (4) and a bottom wear-resistant layer (5) arranged sequentially from top to bottom. The lower surface of the PTFE sealing layer (3) is fixedly connected with a plurality of interlocking teeth (6) extending into the rubber elastic layer (4). The interior of the rubber elastic layer (4) is fixedly connected with a support skeleton (7).

2. The combined rubber sealing gasket according to claim 1, characterized in that: The rubber elastic layer (4) is one of fluororubber, hydrogenated nitrile rubber or EPDM rubber.

3. The combined rubber sealing gasket according to claim 1, characterized in that: The bottom wear-resistant layer (5) is polyurethane rubber.

4. The combined rubber sealing gasket according to claim 1, characterized in that: The supporting frame (7) is a spring steel wire woven mesh with a wavy cross section.

5. A combined rubber sealing gasket according to claim 1, characterized in that: The PTFE sealing layer (3), the rubber elastic layer (4), and the bottom wear-resistant layer (5) are all bonded together with each other by an adhesive.

6. A combined rubber sealing gasket according to claim 1, characterized in that: The lower end face of the bottom wear-resistant layer (5) is fixedly connected with a plurality of uniformly distributed wear-resistant particles (8).

7. A combined rubber sealing gasket according to claim 1, characterized in that: The upper surface of the sealing gasket body (1) is an arc-shaped concave surface.

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