High-temperature-resistant graphite sealing gasket structure

Abstract

The utility model discloses a kind of high-temperature-resistant graphite sealing gasket structures, including upper graphite layer and lower graphite layer, framework assembly is arranged between the upper graphite layer and lower graphite layer;The framework assembly includes upper metal mesh board, lower metal mesh board, support column, locating seat and locating hole;The opposite surface of the locating seat is fixedly connected to the upper metal mesh board and lower metal mesh board.This utility model provides powerful mechanical support by setting framework assembly inside gasket, can effectively prevent gasket from being crushed, relaxed and stress attenuation under long-term high temperature and high pressure, and sealing life is greatly extended;The addition of metal mesh makes the integrity of gasket better, not easy to bend, break or damage, can keep the structure complete more during installation and disassembly process, especially suitable for large-diameter or non-ideal working condition flange;Gasket only sets one filling layer, simple structure, reduces the difficulty of production assembly, overall processing procedure is shorter, cost is lower.

Description

Technical Field

[0001] This utility model relates to a gasket structure, specifically a high-temperature resistant graphite sealing gasket structure, belonging to the field of sealing gasket technology. Background Technology

[0002] Graphite gaskets are a type of sealing gasket with graphite as the core sealing material. Their core function is to fill the microscopic gaps in the sealing surface under the action of bolt preload through their flexibility, compression resilience, high temperature resistance, and chemical corrosion resistance, thereby blocking the leakage of media such as gas, liquid, and steam. They are suitable for complex working conditions ranging from normal temperature and low pressure to high temperature and medium and high pressure of hundreds of degrees or even above 1000 degrees Celsius. Graphite composite gaskets are a type of graphite sealing gasket, which refers to graphite gaskets with metal (such as metal mesh, metal foil, metal skeleton) and inorganic fiber (such as glass fiber, carbon fiber) reinforcement materials added to the graphite base material through a composite process.

[0003] A Chinese utility model patent (publication number: CN218954016U) discloses a high-temperature resistant graphite composite gasket, which includes a graphite layer, a graphite composite component, a metal skeleton, etc. The metal skeleton is composed of two corrugated supports. The space between the metal skeleton and the graphite layer is filled by composite component one, composite component three, and composite component two, thereby forming a graphite composite gasket.

[0004] The metal skeleton significantly improves the overall mechanical strength and deformation resistance of the gasket. However, multiple composite components need to be filled between the metal fastener and the graphite layer. These composite components need to be custom-made according to the gap size and stress characteristics between the metal fastener and the graphite layer. During the assembly process, the position, thickness and fit of each composite component with the metal fastener and graphite layer must be precisely controlled to avoid structural damage caused by misalignment, gaps or excessive compression. At the same time, the subsequent overall pressure bonding, cutting and forming processes also need to adjust the process parameters for the complex structure of multiple superimposed components. This increases the design and manufacturing complexity of the parts, resulting in a longer overall processing flow and higher cost. Therefore, a high-temperature resistant graphite sealing gasket structure is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a high-temperature resistant graphite gasket structure to solve one of the problems mentioned in the background art.

[0006] This utility model is implemented by the following technical solution: a high-temperature resistant graphite sealing gasket structure, including an upper graphite layer and a lower graphite layer, wherein a skeleton assembly is provided between the upper graphite layer and the lower graphite layer;

[0007] The skeleton assembly includes an upper metal mesh plate, a lower metal mesh plate, a support column, a positioning seat, and positioning holes;

[0008] The positioning seats are symmetrically fixedly connected to the opposite surfaces of the upper and lower metal mesh plates. The positioning holes are opened inside the positioning seats. The support columns are located between the upper and lower metal mesh plates, and their two ends are respectively inserted into the positioning holes of the corresponding two positioning seats. The upper metal mesh plate is attached to the inner top wall of the upper graphite layer, and the lower metal mesh plate is attached to the upper surface of the lower graphite layer.

[0009] As a further preferred embodiment of this technical solution: a core filling layer is provided between the upper metal mesh plate and the lower metal mesh plate.

[0010] As a further preferred embodiment of this technical solution: the support column is embedded inside the core filling layer, and the upper and lower surfaces of the core filling layer are respectively attached to the opposite surfaces of the upper and lower metal mesh plates.

[0011] As a further preferred embodiment of this technical solution: the upper graphite layer has a concave structure, and the skeleton assembly is located inside the upper graphite layer.

[0012] As a further preferred embodiment of this technical solution, the upper graphite layer and the lower graphite layer are connected by a pressure bonding method.

[0013] As a further preferred embodiment of this technical solution: the core filling layer is formed by a composite of graphite and metal particles.

[0014] As a further preferred embodiment of this technical solution: both the upper and lower surfaces of the core filling layer are provided with grooves for accommodating the positioning seat.

[0015] As a further preferred embodiment of this technical solution: the core filling layer has a through groove adapted to the support column for accommodating the support column.

[0016] Advantages of this utility model:

[0017] 1. This utility model provides strong mechanical support by setting a skeleton component inside the gasket, which can effectively prevent the gasket from crushing, loosening and stress attenuation under long-term high temperature and high pressure, greatly extending the sealing life. Even under working conditions with fluctuations in pressure and temperature, it can maintain stable sealing performance.

[0018] 2. The addition of metal mesh to this utility model makes the gasket more robust, less prone to bending, breaking or damage, and better able to maintain structural integrity during installation and disassembly, especially suitable for flanges with large diameter or under non-ideal working conditions.

[0019] 3. The gasket of this utility model has only one filling layer, which is simple in structure, reduces the difficulty of production and assembly, and makes the overall processing flow shorter and the cost lower. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is an exploded view of the structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the skeleton component structure of this utility model;

[0024] Figure 4 This is a schematic diagram showing the installation position of the positioning seat of this utility model;

[0025] Figure 5 This is a cross-sectional view of the present invention.

[0026] In the figure: 101, skeleton assembly; 11, upper metal mesh plate; 12, lower metal mesh plate; 13, support column; 14, positioning seat; 15, positioning hole; 16, core filling layer; 31, upper graphite layer; 32, lower graphite layer. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example

[0029] Please see Figures 1-5 This utility model provides a technical solution: a high-temperature resistant graphite sealing gasket structure, including an upper graphite layer 31 and a lower graphite layer 32, with a skeleton assembly 101 disposed between the upper graphite layer 31 and the lower graphite layer 32;

[0030] The skeleton assembly 101 includes an upper metal mesh plate 11, a lower metal mesh plate 12, a support column 13, a positioning seat 14, and a positioning hole 15;

[0031] The upper graphite layer 31 has a concave structure, and the skeleton component 101 is located inside the upper graphite layer 31. The upper graphite layer 31 and the lower graphite layer 32 are made of pure flexible graphite foil, which provides the gasket with excellent basic sealing performance, high temperature resistance and chemical stability.

[0032] The upper graphite layer 31 and the lower graphite layer 32 are connected by pressure bonding. The upper metal mesh plate 11 is attached to the inner top wall of the upper graphite layer 31, and the lower metal mesh plate 12 is attached to the upper surface of the lower graphite layer 32. This allows the upper graphite layer 31, the lower graphite layer 32 and the internal skeleton component 101 to be firmly combined into a dense, interface-free whole.

[0033] The positioning seats 14 are symmetrically fixed to the opposite surfaces of the upper metal mesh plate 11 and the lower metal mesh plate 12. The positioning seats 14 are fixed by welding. The positioning holes 15 are opened inside the positioning seats 14. The support columns 13 are located between the upper metal mesh plate 11 and the lower metal mesh plate 12, and their two ends are respectively inserted into the positioning holes 15 of the corresponding two positioning seats 14. Thus, a uniformly distributed rigid support point array is established between the upper metal mesh plate 11 and the lower metal mesh plate 12. The core function of these support columns 13 is to limit the excessive compression of the gasket under the action of bolt preload and internal medium pressure, control the amount of compression deformation within a preset and stable range, and effectively prevent the sealing stress from decaying due to the creep of graphite material.

[0034] The upper metal mesh plate 11 and the lower metal mesh plate 12 are made of 304 stainless steel.

[0035] In this embodiment, specifically: a core filling layer 16 is provided between the upper metal mesh plate 11 and the lower metal mesh plate 12, and the support column 13 is embedded in the interior of the core filling layer 16. The upper and lower surfaces of the core filling layer 16 are respectively attached to the opposite surfaces of the upper metal mesh plate 11 and the lower metal mesh plate 12. Since the core filling layer 16 fills the cavity between the upper metal mesh plate 11 and the lower metal mesh plate 12 and covers and embeds the support column 13 inside it, the compressive strength of the gasket can be further enhanced.

[0036] In this embodiment, specifically: the core filling layer 16 is formed by a composite of graphite and metal particles, and the metal particles are stainless steel powder.

[0037] In this embodiment, specifically: the upper and lower surfaces of the core filling layer 16 are provided with grooves for accommodating the positioning seat 14, and the interior of the core filling layer 16 is provided with through grooves that are compatible with the support column 13 for accommodating the support column 13, thereby ensuring the accuracy and integrity of the assembly.

[0038] The working principle or structural principle is as follows: When the high-temperature resistant graphite gasket of this utility model is installed between flanges and fastened with bolts:

[0039] The bolt preload first acts on the upper graphite layer 31 and the lower graphite layer 32, causing them to undergo elastic deformation, filling the microscopic unevenness of the flange surface, and forming an initial seal. As the tightening force increases, the pressure is transmitted to the skeleton assembly 101 through the upper graphite layer 31 and the lower graphite layer 32. The upper metal mesh plate 11 and the lower metal mesh plate 12 convert the point load into a surface load and distribute the stress evenly. When the compression reaches the design value, the support column 13 and the core filling layer 16 together form a mechanical stop, preventing the gasket from being further over-compressed, thereby maintaining a high and stable sealing pressure.

[0040] This invention provides strong mechanical support by setting a skeleton component 101 inside the gasket, which can effectively prevent the gasket from crushing, loosening and stress attenuation under long-term high temperature and high pressure, greatly extending the sealing life. Even under working conditions with fluctuations in pressure and temperature, it can maintain stable sealing performance. Moreover, the addition of metal mesh makes the gasket more integral, not easy to bend, break or be damaged, and can maintain structural integrity during installation and disassembly. It is especially suitable for flanges with large diameter or non-ideal working conditions. In addition, the gasket only has a filling layer, which simplifies the structure, reduces the difficulty of production and assembly, and shortens the overall processing flow and reduces costs.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-temperature resistant graphite gasket structure, characterized in that, It includes an upper graphite layer (31) and a lower graphite layer (32), and a skeleton assembly (101) is provided between the upper graphite layer (31) and the lower graphite layer (32). The skeleton assembly (101) includes an upper metal mesh plate (11), a lower metal mesh plate (12), a support column (13), a positioning seat (14), and a positioning hole (15). The positioning seat (14) is symmetrically fixedly connected to the opposite surfaces of the upper metal mesh plate (11) and the lower metal mesh plate (12). The positioning hole (15) is opened inside the positioning seat (14). The support column (13) is located between the upper metal mesh plate (11) and the lower metal mesh plate (12), and its two ends are respectively inserted into the positioning holes (15) of the corresponding two positioning seats (14). The upper metal mesh plate (11) is attached to the inner top wall of the upper graphite layer (31), and the lower metal mesh plate (12) is attached to the upper surface of the lower graphite layer (32).

2. The high-temperature resistant graphite gasket structure according to claim 1, characterized in that, A core filling layer (16) is provided between the upper metal mesh plate (11) and the lower metal mesh plate (12).

3. The high-temperature resistant graphite gasket structure according to claim 2, characterized in that, The support column (13) is embedded in the interior of the core filling layer (16), and the upper and lower surfaces of the core filling layer (16) are respectively attached to the opposite surfaces of the upper metal mesh plate (11) and the lower metal mesh plate (12).

4. The high-temperature resistant graphite gasket structure according to claim 1, characterized in that, The upper graphite layer (31) has a concave structure, and the skeleton component (101) is located inside the upper graphite layer (31).

5. The high-temperature resistant graphite gasket structure according to claim 1, characterized in that, The upper graphite layer (31) and the lower graphite layer (32) are connected by pressure bonding.

6. The high-temperature resistant graphite gasket structure according to claim 2, characterized in that, The upper and lower surfaces of the core filling layer (16) are provided with grooves for accommodating the positioning seat (14).

7. The high-temperature resistant graphite gasket structure according to claim 6, characterized in that, The core filling layer (16) has a through groove inside that is adapted to the support column (13) for accommodating the support column (13).

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