Metallic toothed gasket

Abstract

The utility model provides metal tooth shape cladding pad relates to the field of connecting accessories, include: one annular core body, the core body is by inner filling layer and completely covers the upper and lower surface and inside and outside lateral edge of inner filling layer metal outer cladding layer constitutes, the at least one sealing surface of core body is through the press and is formed with a plurality of concentric distribution's sealing tooth, makes the metal outer cladding layer and inner filling layer produces the cooperative deformation at sealing tooth. The application through the concentric sealing tooth of inner filling layer 2 full cladding metal layer 3 core body 1 surface press, makes both cooperative deformation. The structure forms multiple high specific pressure sealing line, only needs small bolt pre -tightening force to realize initial sealing, effectively solved the technical problem that the traditional gasket needed pressure tightness is too big, is easy to crush and is dependent on high flange finish. Meanwhile, the composite structure gives gasket excellent resilience compensation capacity, ensures the sealing stability under harsh working condition.

Description

Technical Field

[0001] This utility model relates to the field of connecting accessories, and more particularly to metal toothed covered gaskets. Background Technology

[0002] In industrial flange connections, gaskets are pressed between two flanges, primarily to seal the path of media leakage. Metal-clad gaskets are a key component, combining the strength of metal with the conformability of non-metallic materials by wrapping a metal skeleton, making them a common choice for handling harsh conditions such as high temperature and high pressure.

[0003] Currently, most common metal-clad gaskets use flat or V-shaped rings made of metal strips as the core, with non-metallic sealing layers such as asbestos, rubber, or ordinary graphite covering their upper and lower surfaces. This structure relies on the clamping force of the flange to cause plastic deformation of the non-metallic cladding layer, filling the microscopic unevenness of the flange sealing surface, thereby achieving the sealing purpose.

[0004] However, to achieve an effective seal, these gaskets typically require a large bolt preload, which can lead to flange deformation or excessive crushing of the gasket itself. Furthermore, their sealing performance largely depends on the smoothness of the flange surface, and under repeated thermal cycling or vibration conditions, their resilience is limited due to the structure of the core and sealing layer, making them prone to sealing performance degradation. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by pressing concentric sealing teeth onto the surface of the core 1, which is fully covered by the inner filling layer 2 and the metal layer 3, causing the two to deform synergistically. This structure forms multiple high-pressure sealing lines, requiring only a small bolt preload to achieve initial sealing, effectively solving the technical problems of traditional gaskets such as excessive clamping force, easy crushing, and high dependence on flange surface finish. Simultaneously, the composite structure endows the gasket with excellent rebound compensation capabilities, ensuring sealing stability under harsh operating conditions.

[0006] In order to solve the above-mentioned technical problems, the present invention can solve the problems of high preload, low rebound and poor sealing of traditional metal gaskets through the following technical solution.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: Metal toothed overlay pad, including: A ring-shaped core, the core being composed of an inner filling layer and a metal outer covering layer that completely covers the upper and lower surfaces and inner and outer edges of the inner filling layer; At least one sealing surface of the core is formed with a plurality of concentrically distributed sealing teeth by pressing, so that the outer metal cladding layer and the inner filling layer undergo synergistic deformation at the sealing teeth.

[0008] Preferably, the sealing teeth are formed on both the upper and lower sealing surfaces of the core.

[0009] Preferably, the inner filling layer is flexible graphite or mica.

[0010] Preferably, the outer metal cladding layer is composed of a thin metal plate covering the upper and lower surfaces of the inner filling layer, and an inner metal protective ring and an outer metal protective ring respectively covering the inner and outer edges of the inner filling layer.

[0011] Preferably, the thickness of the metal outer coating is 0.20 to 0.38 mm.

[0012] Preferably, it also includes a metal positioning ring fitted around the periphery of the core body.

[0013] Preferably, the metal positioning ring is a detachable structure.

[0014] Preferably, the outer edge of the outer metal protective ring in the metal outer covering layer extends outward to form a protrusion, which is used to connect with the break point of the metal positioning ring.

[0015] Preferably, the metal positioning ring is fixed to the core by welding, forming a weld point.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The metal toothed gasket provided in this application achieves coordinated deformation by pressing concentric sealing teeth onto the surface of the core 1, which is fully covered by the inner filling layer 2 and the metal layer 3. This structure forms multiple high-pressure sealing lines, requiring only a small bolt preload to achieve initial sealing, effectively solving the technical problems of traditional gaskets such as excessive clamping force, easy crushing, and high dependence on flange surface finish. Simultaneously, the composite structure endows the gasket with excellent rebound compensation capability, ensuring sealing stability under harsh operating conditions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a partial cross-sectional structural diagram of the present invention; Figure 4This is a structural schematic diagram of Embodiment 2 of the present invention; Figure 5 This is a schematic cross-sectional view of the floating connection structure in Embodiment 2 of this utility model; Figure 6 This is a schematic diagram of the welding and fixing cross-sectional structure of Embodiment 2 of this utility model.

[0019] Drawing number explanation: 1. Core; 11. Sealing tooth; 2. Inner filling layer; 3. Metal outer covering layer; 31. Metal sheet; 32. Inner metal protective ring; 33. Outer metal protective ring; 4. Metal positioning ring; 5. Weld point. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0022] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0023] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0024] Example: Please see Figure 1-6 The metal toothed covering gasket includes: an annular core 1, the core 1 being composed of an inner filling layer 2 and a metal outer covering layer 3 that completely covers the upper and lower surfaces and inner and outer edges of the inner filling layer 2; at least one sealing surface of the core 1 is formed with a plurality of concentrically distributed sealing teeth 11 by pressing, such that the metal outer covering layer 3 and the inner filling layer 2 undergo synergistic deformation at the sealing teeth 11.

[0025] The metal toothed gasket of this application is mainly composed of a core 1, an inner filling layer 2, a metal outer covering layer 3, and sealing teeth 11. The following is a detailed description of its structure and working principle.

[0026] The core 1 consists of an inner filling layer 2 and a metal outer cladding layer 3. The metal outer cladding layer 3 completely encapsulates the inner filling layer 2 within it through die stamping or roll forming processes, simultaneously covering the upper and lower sealing surfaces of the inner filling layer 2 as well as its inner and outer edges, forming a sealed and robust composite structure. This fully encapsulated structure effectively prevents the internal filling material from being blown out by the high-pressure medium or from oxidizing and failing due to high temperatures.

[0027] Furthermore, the outer metal cladding layer 3 can be composed of thin metal plates 31 covering the upper and lower surfaces of the inner filling layer 2, and inner and outer metal protective rings 32 and 33 covering the inner and outer edges of the inner filling layer 2, respectively. The edges of the upper and lower thin metal plates 31 are fixedly connected to the inner and outer metal protective rings 32 and 33 by mechanical interlocking, fastening, or welding, etc. (not shown in the figure), thus forming a complete and sealed metal cladding space that firmly encapsulates the inner filling layer 2. This cladding method, composed of multiple components, has the advantages of simple processing, flexible assembly, and excellent radial support.

[0028] On the upper and lower sealing surfaces of the core 1, this embodiment takes double-sided sealing as an example, several concentrically distributed sealing teeth 11 are pressed in one go using a precision mold. This pressing process not only forms the tooth shape, but more importantly, it ensures that the upper and lower metal sheets 31 and the inner filling layer 2 are pressed together into the tooth-shaped cavity of the mold. The two are tightly fitted at the tooth tips, tooth valleys, and tooth sides of the sealing teeth 11, forming a composite structure that deforms synergistically. The cross-section of these sealing teeth 11 can be arc-shaped, trapezoidal, or other shapes that can form a line seal. The inner filling layer 2 is preferably made of flexible graphite or mica, which have good compressibility, resilience, and high temperature resistance. The thickness of the metal outer covering layer 3 is preferably between 0.20 mm and 0.38 mm. When the thickness is 0.20 mm, the gasket is more flexible and easier to compress and deform to compensate for the unevenness of the flange surface; when the thickness is 0.38 mm, the product has higher strength and can better guarantee the shape of the sealing teeth, achieving an excellent line seal effect. The material of the metal outer cladding layer 3 can be selected according to the working conditions, such as 304 stainless steel, 316 stainless steel, Inconel, etc., to ensure that it can maintain strength and sealing performance in ultra-high temperature environments above 800°C.

[0029] Based on Embodiment 1, a metal positioning ring 4 is also included, which is fitted around the outer periphery of the core 1. The main function of the metal positioning ring 4 is to radially position the core 1 during installation, preventing it from deviating from the flange center, and at the same time, to improve the overall rigidity of the gasket to accommodate higher pressure ratings. To achieve a detachable function, facilitating replacement or adjustment according to different flanges and operating conditions, the metal positioning ring 4 is designed to be cut radially, forming a discontinuous structure.

[0030] As one specific embodiment of the detachable connection, the outer metal protective ring 33 in the outer metal cladding layer 3 extends outward at its outer edge, forming a raised ring. The cross-section of this raised ring can be hook-shaped, L-shaped, or other suitable shapes. The metal positioning ring 4 is broken radially, and the inner sides of both ends of the break are provided with grooves or limiting structures that mate with the raised ring, not shown in the figure. Through the engagement of the raised ring and the grooves, the metal positioning ring 4 can be fitted onto the outside of the core 1 and form a floating connection, allowing the core 1 to have space for radial micro-movement when heated or compressed.

[0031] As another implementation, the metal positioning ring 4 can also be fixedly connected to the core 1 by welding. Specifically, several weld points 5 can be formed at the contact points between the metal positioning ring 4 and the outer metal coating layer 3 of the core 1 by spot welding or other methods. This structure is more robust and suitable for working conditions with strong vibration or requiring higher integrity of the gasket.

[0032] Working principle When the gasket is installed between flanges and bolt preload is applied, the flange sealing surface first contacts the tips of several sealing teeth 11 on the surface of the core 1. Due to the sharp decrease in contact area, the compressive stress per unit area, i.e., the contact stress, increases exponentially under the same bolt load. This high contact stress first acts on the outer metal cladding layer 3 and is immediately transmitted and distributed through its synergistic deformation structure with the inner filling layer 2. This high contact stress can easily cause slight plastic deformation of the metal tooth tips, allowing them to bite into the flange surface. Simultaneously, the inner filling layer 2 between the teeth also flows under pressure, jointly filling the microscopic unevenness of the flange surface. Thus, multiple efficient sealing lines can be established with a relatively small bolt preload, achieving initial sealing. This fundamentally solves the problem of traditional flat gaskets requiring extremely high preload, avoiding flange deformation or gasket crushing.

[0033] The structural design of the sealing teeth 11 and the synergistic deformation capability of the composite material reduce the stringent requirements for the surface finish of the flange. Even if there are minor scratches or unevenness on the flange surface, they can be effectively filled by the sealing teeth 11 and the flexible filler material between them. In addition, this synergistic deformation structure of the core 1, with the soft inner filler layer 2 and the tough metal outer cladding layer 3, gives it a certain degree of local deformation capability, which can compensate for minor unevenness or warping of the flange.

[0034] When operating conditions fluctuate, such as during temperature cycles, pressure pulses, or mechanical vibrations, the outer metal cladding layer 3, acting as a confined metal spring, stores elastic deformation energy. When the medium pressure decreases or the clamping force loosens due to thermal expansion and contraction of the connectors, the outer metal cladding layer 3 releases its elastic deformation and, through synergy with the inner filling layer 2, drives the entire sealing structure to rebound, maintaining the clamping force on the flange face and compensating for the decrease in sealing pressure. This is completely different from traditional gaskets that primarily rely on the rebound of non-metallic materials. The synergistic deformation structure ensures the consistency and effectiveness of the rebound action, thereby ensuring long-term sealing stability under harsh operating conditions.

[0035] The outer metal cladding layer 3 completely encloses the inner filling layer 2, isolating it from the external medium and oxygen. This not only prevents the erosion of the filling material but also significantly slows down its oxidation rate at high temperatures. Simultaneously, the metal cladding layer itself, as the primary load-bearing structure, maintains sufficient strength at high temperatures to support the sealing teeth 11, which are composed of the metal and filling material, and provides necessary resilience, thus ensuring the gasket can still operate reliably in ultra-high temperature environments exceeding 800°C.

[0036] In summary, through the creative combination of the fully encapsulated composite core 1 and the multi-seal teeth 11, and especially through the synergistic deformation structure achieved by the pressing process, excellent results are achieved with low preload, high sealing performance, low requirements on the flange surface, and long sealing life under high temperature, high pressure and cyclic conditions.

[0037] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A metal toothed coated pad, characterized in that, include: A ring-shaped core (1) is composed of an inner filling layer (2) and a metal outer covering layer (3) that completely covers the upper and lower surfaces and inner and outer edges of the inner filling layer (2); At least one sealing surface of the core (1) is formed with a plurality of concentrically distributed sealing teeth (11) by pressing, so that the metal outer cladding layer (3) and the inner filling layer (2) undergo synergistic deformation at the sealing teeth (11).

2. The metal toothed coated pad according to claim 1, characterized in that: The sealing teeth (11) are formed on both the upper and lower sealing surfaces of the core (1).

3. The metal toothed coated pad according to claim 1, characterized in that: The inner filling layer (2) is flexible graphite or mica.

4. The metal toothed coated pad according to claim 1, characterized in that: The outer metal cladding layer (3) is composed of a thin metal plate (31) covering the upper and lower surfaces of the inner filling layer (2), and an inner metal protective ring (32) and an outer metal protective ring (33) covering the inner and outer edges of the inner filling layer (2).

5. The metal toothed covered pad according to claim 1, characterized in that: The thickness of the metal outer cladding layer (3) is 0.20 to 0.38 mm.

6. The metal toothed covered pad according to claim 1, characterized in that: It also includes a metal positioning ring (4) fitted around the outer periphery of the core (1).

7. The metal toothed coated pad according to claim 6, characterized in that: The metal positioning ring (4) is a detachable structure.

8. The metal toothed coated pad according to claim 7, characterized in that: The outer edge of the outer metal protective ring (33) in the metal outer covering layer (3) extends outward to form a protrusion, which is used to connect with the disconnection of the metal positioning ring (4).

9. The metal toothed coated pad according to claim 7, characterized in that: The metal positioning ring (4) is fixed to the core (1) by welding, forming a weld point (5).

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