Insulating gasket with high compensation

Abstract

The utility model provides a kind of insulating gasket with high compensation, it is related to the field of connecting fittings, comprising: core structure, by metal band and flexible insulating material composite constitute, the core structure is configured to be able to provide the compression resilience performance of axial;Inner edge structure, setting at the inner diameter of the gasket, is made of first insulating material;Outer edge coating, made of second insulating material, and completely covered in the outer circumferential side surface of the core structure.This application provides better axial compression resilience by the core structure of metal band and flexible insulating material composite, ensures the high compensation of sealing;By the more rigid insulating inner edge structure, effectively prevent the crushing failure of gasket when overpressure;And by the synergistic cooperation of core, inner edge, outer edge triple insulating structure, constitutes all-around electric isolation barrier, fundamentally solves the technical problems of insufficient insulating performance of traditional metal winding gasket, easy to crush and insulating failure under extreme working conditions.

Description

Technical Field

[0001] This utility model relates to the field of connecting accessories, and in particular to an insulating gasket with high compensation. Background Technology

[0002] At the joints of industrial pipelines, pressure vessels, and other equipment, the sealing between metal flanges is crucial for ensuring the safe and reliable operation of the system. Gaskets, as components clamped between two flanges, primarily fill the microscopic unevenness of the flange surface under various operating conditions. Through their elastic deformation, they compensate for sealing gaps caused by pressure and temperature fluctuations, thereby achieving a long-term effective seal.

[0003] Commonly used metal spiral wound gaskets in the prior art, such as standard ANSI gaskets, are typically made by alternating winding of metal strips, such as stainless steel strips, and non-metallic filler strips, such as asbestos or ordinary graphite. These gaskets rely on the elasticity of the metal strips and the sealing properties of the filler strips to function. To improve the overall performance of the gasket, some improved designs add metal or non-metallic locating rings or edging layers at the inner and outer diameter positions of the gasket.

[0004] However, the gaskets described above have significant shortcomings when dealing with operating conditions requiring electrical insulation. First, their metal skeleton is prone to creating electrical circuits between flanges, failing to meet insulation requirements. Second, when the gasket faces overload pressure, its internal structure is easily permanently crushed, leading to seal failure and inability to rebound. Furthermore, under extreme operating conditions, existing gaskets often lack effective insulation backup mechanisms for their inner and outer edge coatings. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing better axial compression resilience through a core structure composed of a metal strip and flexible insulating material, ensuring high sealing compensation; the more rigid inner insulating edge structure effectively prevents crushing failure of the gasket under overpressure; and the synergistic cooperation of the core, inner edge, and outer edge triple insulation structures forms a comprehensive electrical isolation barrier.

[0006] In order to solve the above-mentioned technical problems, the present invention can solve the technical problems of insufficient insulation performance, easy crushing and insulation failure under extreme working conditions of traditional metal spiral wound gaskets through the following technical solution.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An insulating pad with high compensation capacity includes: The core structure is composed of a metal strip and a flexible insulating material, and the core structure is configured to provide axial compressive resilience. An inner edge structure, located at the inner diameter of the gasket, is made of a first insulating material. The rigidity of the inner edge structure is higher than the overall rigidity of the core structure, which is used to prevent the gasket from being crushed. The outer edge covering layer is made of a second insulating material and completely covers the outer peripheral side of the core structure; The core structure, inner edge structure, and outer edge covering layer together constitute an electrical isolation barrier.

[0008] Preferably, the flexible insulating material is expanded polytetrafluoroethylene.

[0009] Preferably, the core structure is a composite structure formed by intertwining the metal strip and the flexible insulating material.

[0010] Preferably, the winding is a double-opposing winding.

[0011] Preferably, the first insulating material is modified polytetrafluoroethylene.

[0012] Preferably, the second insulating material is polytetrafluoroethylene.

[0013] Preferably, the metal strip is a metal steel strip.

[0014] Preferably, the inner edge structure is tightly joined to the inner diameter side of the core structure, and forms a sealing surface between the flanges when the gasket is subjected to overpressure.

[0015] Preferably, the outer edge covering layer completely covers the outer peripheral side surface of the core structure.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This application provides an insulating gasket with high compensation performance. Through a core structure composed of a metal strip and a flexible insulating material, it provides good axial compression resilience, ensuring high sealing compensation. Through a more rigid inner insulating edge structure, it effectively prevents crushing failure of the gasket under overpressure. Through the synergistic cooperation of the core, inner edge, and outer edge triple insulation structure, it forms a comprehensive electrical isolation barrier, fundamentally solving the technical problems of insufficient insulation performance, easy crushing, and insulation failure under extreme conditions of traditional metal spiral wound gaskets. 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 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a frontal cross-sectional view of the present invention. Figure 3 This utility model Figure 2 A schematic diagram of a local structure.

[0019] Drawing number explanation: 1. Core structure; 2. Metal strip; 3. Flexible insulation material; 4. Inner edge structure; 5. Outer edge covering layer. 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 1-3 An insulating gasket with high compensability includes: a core structure 1 composed of a metal strip 2 and a flexible insulating material 3, the core structure 1 being configured to provide axial compression resilience; an inner edge structure 4 disposed at the inner diameter of the gasket, made of a first insulating material, the rigidity of the inner edge structure 4 being higher than the overall rigidity of the core structure 1, used to prevent the gasket from being crushed; and an outer edge covering layer 5 made of a second insulating material, completely covering the outer peripheral side of the core structure 1; wherein the core structure 1, the inner edge structure 4, and the outer edge covering layer 5 together constitute an electrical isolation barrier.

[0025] The insulating gasket with high compensation in this application is generally ring-shaped and mainly consists of three parts: core structure 1, inner edge structure 4, and outer edge covering layer 5.

[0026] The core structure 1 is composed of a V-shaped metal strip 2 and an expanded polytetrafluoroethylene (PTFE) strip 3, which serves as a flexible insulating material, wound in a double-opposite manner. This special winding method creates dense, spring-like metal support points along the axial direction of the gasket, while the expanded PTFE filling the space provides the structure with extremely high compressibility and resilience. When the flange bolts are tightened (not shown in the figure), the core structure 1 is compressed, absorbing mechanical energy; when pressure or temperature fluctuations occur during operation, the stored energy is released, causing the gasket to rebound, thereby continuously compensating for the sealing gap and ensuring the long-term effectiveness of the seal. Simultaneously, the expanded PTFE itself is an excellent insulating material, isolating the metal strips 2 from each other and providing overall electrical isolation from the upper and lower flanges.

[0027] The inner edge structure 4 is made of highly rigid modified polytetrafluoroethylene (PTFE) through a molding process and is tightly bonded to the inner diameter side of the core structure 1 by interference fit or bonding. The modified PTFE, with the addition of fillers such as glass fiber and graphite, has significantly higher creep resistance and mechanical strength than the expanded PTFE in the core structure 1. Its main function is to prevent crushing. When the system pressure rises abnormally and the clamping force on the gasket exceeds the design value, the flexible core structure 1 may be overcompressed. In this case, the highly rigid inner edge structure 4 acts as a solid mechanical support, preventing the gasket from being permanently crushed and failing. Furthermore, under overpressure conditions, even if the core structure 1 is compressed to its limit, the inner edge structure 4 can still maintain tight contact with the flange surface, forming an auxiliary sealing and insulation barrier to prevent media leakage and the formation of electrical pathways.

[0028] The outer edge covering layer 5 is located at the outer diameter of the gasket. In this embodiment, it is a complete covering layer formed by a polytetrafluoroethylene (PTFE) strip through a covering process, completely enclosing the outer peripheral side of the core structure 1. Its main function is to provide extreme insulation backup. In the event of installation misalignment or pipe stress causing radial displacement of the two flanges and potential contact, the outer edge covering layer 5 ensures that the flange metals do not directly contact the outside of the gasket, thereby cutting off any potential external electrical pathways. Together with the core structure 1 and the inner edge structure 4, it forms a complete, seamless electrical isolation barrier.

[0029] Working principle Under normal installation and operating conditions, the system primarily relies on the core structure 1 for operation. The preload of the flange bolts causes axial compression, while the elastic deformation of the metal strip 2 and the flexible flow of the flexible insulating material 3 work together to fill the microscopic unevenness of the flange sealing surface, achieving initial sealing.

[0030] When changes in medium pressure or temperature cause slight movements in the flange gap, the core structure 1, with its composite structure consisting of a metal strip 2 and a flexible insulating material 3, can generate corresponding rebound or following deformation, dynamically compensating for the sealing gap and maintaining the sealing specific pressure. This is the manifestation of high compensation.

[0031] When the system experiences abnormal overload pressure, the compression of the core structure 1 reaches its limit. At this point, the inner edge structure 4, with a rigidity far exceeding that of the core, begins to bear pressure. As an internal stop block, it prevents the gasket from being further flattened, thus preventing permanent seal failure. Under this overpressure condition, the end face of the inner edge structure 4 fits tightly against the flange surface, becoming the primary sealing surface. Simultaneously, because it is an insulating material, it ensures that even under the most severe operating conditions, no electrical path is formed on the inner diameter side of the gasket.

[0032] Throughout the gasket's service life, the flexible insulating material 3 in the core structure 1 completely encapsulates and isolates the metal strip 2. The inner edge structure 4 and the outer edge covering layer 5 are made of modified PTFE and PTFE, respectively. These three components, from the top, bottom, interior, inner diameter side, and outer diameter side of the gasket, together form a comprehensive and continuous electrical isolation barrier, reliably isolating the metal flanges on both sides. The outer edge covering layer 5 is specifically designed to prevent the risk of flange outer diameter contact due to installation or deformation, providing a final layer of insulation protection and ensuring the absolute reliability of the insulation function. In summary, the gasket ultimately achieves long-term stability and reliability of its sealing and insulation performance under complex and harsh operating conditions.

[0033] 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. An insulating gasket with high compensation performance, characterized in that, include: The core structure (1) is composed of a metal strip (2) and a flexible insulating material (3), and the core structure (1) is configured to provide axial compression resilience. The inner edge structure (4) is located at the inner diameter of the gasket and is made of a first insulating material. The rigidity of the inner edge structure (4) is higher than the overall rigidity of the core structure (1) to prevent the gasket from being crushed. The outer edge covering layer (5) is made of a second insulating material and completely covers the outer peripheral side of the core structure (1); The core structure (1), the inner edge structure (4), and the outer edge covering layer (5) together constitute an electrical isolation barrier.

2. The insulating gasket with high compensation performance according to claim 1, characterized in that: The flexible insulating material (3) is expanded polytetrafluoroethylene.

3. An insulating gasket with high compensation performance according to claim 1 or 2, characterized in that: The core structure (1) is a composite structure formed by the metal strip (2) and the flexible insulating material (3) intertwined.

4. An insulating gasket with high compensability according to claim 3, characterized in that: The winding is a double-opposing winding.

5. An insulating gasket with high compensability according to claim 1, characterized in that: The first insulating material is modified polytetrafluoroethylene.

6. An insulating gasket with high compensability according to claim 1, characterized in that: The second insulating material is polytetrafluoroethylene.

7. An insulating gasket with high compensability according to claim 1, characterized in that: The metal strip (2) is a metal steel strip.

8. An insulating gasket with high compensability according to claim 1, characterized in that: The inner edge structure (4) is tightly joined to the inner diameter side of the core structure (1) and forms a sealing surface between the flanges when the gasket is subjected to overpressure.

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