Metal C-shaped sealing ring and sealing method

Abstract

The invention provides a metal C-shaped sealing ring and a sealing method. The metal C-shaped sealing ring comprises a sealing layer, a middle layer and a spring layer. Wherein the sealing layer is located on the outermost side of the metal C-shaped sealing ring, the spring layer is located on the innermost side of the metal C-shaped sealing ring, and the middle layer is clamped between the sealing layer and the spring layer; the sealing layer and the middle layer are in a C shape with a notch, and the spring layer is in a closed circle shape without a notch. The sealing layer is in contact with the flange sealing surface and is used for sealing the metal C-shaped sealing ring; the middle layer is used for absorbing the pressure difference between the sealing surfaces of the two flanges; the spring layer comprises a plurality of flat wire springs which are spirally spliced, the outer sides of the flat wire springs form a closed face relative to the middle layer, and the spring layer is used for providing reaction force for the sealing layer in the compression process of the metal C-shaped sealing ring. According to the metal C-shaped sealing ring and the sealing method, the damage of the metal C-shaped sealing ring to the flange sealing face in the using process is reduced, and meanwhile good sealing is achieved.

Description

Technical Field

[0001] The present application relates to the field of sealing technology, and in particular to a metal C-type sealing ring and a sealing method. Background Art

[0002] At present, in the sealing structure of bolted connection of pressure vessels and pipeline flanges in high temperature environment and with requirements for gas leakage, most of the seals use metal C-type sealing rings, which can achieve good sealing when the sealing structure is used for the first time. However, since the springs in the metal C-type sealing rings are all made of compact spiral springs wound with round spring steel wire, the metal C-type sealing rings have gaps in the spiral springs during use, which makes the stress concentration on the protruding parts of the springs when they are compressed, damaging the flange sealing surface. At the same time, the metal C-type sealing rings are unevenly stressed, reducing the sealing effect of the metal C-type sealing rings, which brings many troubles to the engineering maintenance process, such as on-site repair and grinding of the flange sealing surface, and reprocessing of the sealing parts of large equipment after returning to the equipment manufacturer.

[0003] Therefore, it is urgent to upgrade and optimize the structure of the original metal C-type sealing ring to reduce the damage of the metal C-type sealing ring to the flange sealing surface during use, while achieving good sealing. Summary of the invention

[0004] In view of this, the present application provides a metal C-type sealing ring and a sealing method, so as to reduce the damage of the metal C-type sealing ring to the flange sealing surface during use, while achieving good sealing.

[0005] Specifically, the present application is implemented through the following technical solutions: In a first aspect, the present application provides a metal C-shaped sealing ring, the metal C-shaped sealing ring comprising a sealing layer, an intermediate layer and a spring layer; wherein the sealing layer is located at the outermost side of the metal C-shaped sealing ring, the spring layer is located at the innermost side of the metal C-shaped sealing ring, and the intermediate layer is sandwiched between the sealing layer and the spring layer; the sealing layer and the intermediate layer are C-shaped with a notch, and the spring layer is a closed circle without a notch; The sealing layer contacts the flange sealing surface and is used to seal the metal C-shaped sealing ring to prevent gas leakage in the metal C-shaped sealing ring; The intermediate layer is used to absorb the pressure difference between the two flange sealing surfaces to protect the sealing layer and the flange sealing surfaces; The spring layer includes a plurality of spirally spliced ​​flat wire springs, the outer sides of the plurality of flat wire springs form a closed surface relative to the middle layer, and the spring layer is used to provide a supporting reaction force to the sealing layer during the compression process of the metal C-type sealing ring, so as to deform the material of the sealing layer and fill the tiny capillary leakage channel of the flange sealing surface.

[0006] A second aspect of the present application provides a sealing method, which is applied to any one of the metal C-shaped sealing rings provided in the first aspect of the present application; the method comprises: When the metal C-shaped sealing ring is compressed, the spring layer provides a supporting reaction force to the sealing layer, so that the material of the sealing layer is deformed; The sealing layer fills the tiny capillary leakage channels on the flange sealing surface and seals the gas in the metal C-shaped sealing ring; The intermediate layer absorbs the pressure difference between the two flange sealing surfaces and provides a buffering effect to protect the sealing layer and the flange sealing surfaces.

[0007] The metal C-type sealing ring and sealing method provided by the present application, the metal C-type sealing ring includes a sealing layer, an intermediate layer and a spring layer. Among them, the spring in the spring layer adopts a compact helical spring wound with flat spring steel wire. When the metal C-type sealing ring is compressed, the spring layer provides a supporting reaction force to the sealing layer to deform the material of the sealing layer and fill the tiny capillary leakage channel on the flange sealing surface. On the one hand, since there is no gap in the spring layer, the uniformity and continuity of the sealing pressure ratio of the seal during long-term use are guaranteed, and the damage to the flange sealing surface caused by the stress concentration of the supporting reaction force generated by the spring during compression is avoided. On the other hand, since the sealing layer fills the tiny capillary leakage channel on the flange sealing surface under the action of deformation, the seal still has excellent sealing performance under low stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A schematic diagram of the structure of a first embodiment of a metal C-shaped sealing ring provided in the present application; Figure 2 This is a schematic structural diagram of a spring layer shown in an exemplary embodiment of the present application; Figure 3 This is a flow chart of Example 1 of the sealing method provided in this application. DETAILED DESCRIPTION

[0009] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0010] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0011] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0012] Specific embodiments are given below to introduce the technical solution of the present application in detail.

[0013] Figure 1 This is a schematic diagram of the structure of the first embodiment of the metal C-type sealing ring provided in this application. Figure 1 The metal C-shaped sealing ring provided in this embodiment comprises a sealing layer, an intermediate layer and a spring layer; wherein the sealing layer is located at the outermost side of the metal C-shaped sealing ring, the spring layer is located at the innermost side of the metal C-shaped sealing ring, and the intermediate layer is sandwiched between the sealing layer and the spring layer; the sealing layer and the intermediate layer are C-shaped with a notch, and the spring layer is a closed circle without a notch; The sealing layer contacts the flange sealing surface and is used to seal the metal C-shaped sealing ring to prevent gas leakage in the metal C-shaped sealing ring; The intermediate layer is used to absorb the pressure difference between the two flange sealing surfaces to protect the sealing layer and the flange sealing surfaces; The spring layer includes a plurality of spirally spliced ​​flat wire springs, the outer sides of the plurality of flat wire springs form a closed surface relative to the middle layer, and the spring layer is used to provide a supporting reaction force to the sealing layer during the compression process of the metal C-type sealing ring, so as to deform the material of the sealing layer and fill the tiny capillary leakage channel of the flange sealing surface.

[0014] For details, please refer to Figure 1The metal C-type sealing ring includes a sealing layer, an intermediate layer and a spring layer. Among them, the sealing layer is located at the outermost side of the metal C-type sealing ring, and the sealing layer is C-shaped with a notch. Furthermore, the cross-section of the sealing layer is C-shaped, which includes a first outer sealing surface and a first inner sealing surface. The first outer sealing surface of the sealing layer contacts with a flange sealing surface on one side, and the first inner sealing surface of the sealing layer contacts with the intermediate layer. The C-shaped structure has an opening part and a closed part. The opening part allows the sealing layer to be compressed and deformed under pressure to enhance the sealing effect. The closed part provides sufficient rigidity to maintain the stability of the overall structure.

[0015] Further, the sealing layer is composed of a material with high elasticity and high corrosion resistance, which includes at least polytetrafluoroethylene (having excellent chemical inertness, high temperature resistance and low friction characteristics), flexible graphite (having good high temperature resistance and chemical corrosion resistance), metal composite materials (such as stainless steel and nickel-based alloys, providing high strength and good corrosion resistance) or nickel-based alloys (having excellent high temperature resistance and corrosion resistance).

[0016] For details, please continue to refer to Figure 1 The middle layer is sandwiched between the sealing layer and the spring layer, and the middle layer is C-shaped with a notch. Further, the cross section of the middle layer is C-shaped, and includes a second outer sealing surface and a second inner sealing surface. The second outer sealing surface of the middle layer contacts the first inner sealing surface of the sealing layer, and the second inner sealing surface of the middle layer contacts the spring layer.

[0017] It should be noted that the circumferential opening position of the sealing layer completely corresponds to the circumferential opening position of the middle layer, forming a C-shape. This design allows the sealing layer and the middle layer to deform in the same manner when subjected to stress, avoiding stress concentration and leakage risks, ensuring that the sealing layer and the middle layer can deform in coordination when subjected to stress, providing a uniform sealing effect, and helping to improve the overall performance of the metal C-type sealing ring.

[0018] The metal C-shaped sealing ring provided in this embodiment helps to provide uniform deformation under pressure by setting the cross-section of the sealing layer and the middle layer to a C-shape, and plays a buffering and adapting role in the metal C-shaped sealing ring to provide reliable sealing performance.

[0019] Furthermore, the middle layer is made of a flexible material with buffering properties, which includes at least flexible graphite (providing good sealing performance and high temperature resistance), rubber and elastomer (having good elasticity and chemical corrosion resistance, suitable for low to medium and high temperature environments) or polymer composite materials (such as polyimide, polyurethane, providing excellent wear resistance and elasticity).

[0020] Specifically, Figure 2 This is a schematic diagram of the structure of the spring layer shown in an exemplary embodiment of the present application. Figure 1 and Figure 2The spring layer is located at the innermost side of the metal C-shaped sealing ring, and includes a plurality of spirally spliced ​​flat wire springs. The outer sides of the plurality of flat wire springs form a closed surface relative to the middle layer. Adjacent flat wire springs are closely attached to each other without any gaps, and there are no gaps in the spring layer.

[0021] Further, the spring layer is a closed circle without a notch. The flat wire spring in the spring layer is flat, and is usually rectangular or elliptical. Different from the circular cross-section corresponding to the traditional round wire spring, the flat cross-section makes it take up less space in the axial direction, but occupies more space in the radial direction. The spiral structure of the spring layer is a spiral splicing, that is, the flat wire spring is spliced ​​in a spiral shape by flat metal wires. Each circle of flat wires fits tightly together, and there is almost no gap between adjacent flat wires. This spiral structure enables the flat wire spring to evenly distribute pressure when it is stressed. Further, the adjacent flat wire springs of the spring layer are tightly attached without gaps. This gapless design ensures uniform distribution of pressure and improves sealing performance, especially in applications requiring high sealing. Further, the spring layer has a high contact area. Due to the flat cross-sectional shape, the flat wire spring has a large contact area when it contacts other components. This large contact area helps to better disperse and withstand pressure. Furthermore, the flat wire spring has good elasticity. Although the cross section of the flat wire is flat, its material and structural design enable it to still have good elasticity and recovery ability, and can provide stable elastic force under pressure.

[0022] The metal C-type sealing ring provided in this embodiment is designed as a C-type with a notch for the sealing layer and the middle layer, and the spring layer is designed as a closed circle without a notch. On the one hand, the rigidity of the C-type structure is smaller than that of the closed circular structure, so that the sealing layer and the middle layer have greater elastic deformation ability during the compression process, allowing the sealing layer and the middle layer to be more easily deformed when subjected to pressure, adapting to the shape and pressure distribution of the sealing surface, so that the sealing layer and the middle layer can achieve close contact under a lower compression force, thereby enhancing the sealing effect. On the other hand, since the C-type structure has a greater deformation ability, it can disperse the pressure applied from the outside and reduce the pressure concentration phenomenon. This dispersion effect enables the sealing layer and the middle layer to transfer the pressure to the entire sealing surface more evenly during the compression process, reducing the risk of sealing failure. The closed circular spring layer has a higher structural integrity and uniform rigidity distribution because it has no notch. This enables the spring layer to provide stable support for the sealing layer and the middle layer during the entire compression process, ensuring that their C-type structure will not be excessively deformed when subjected to force, thereby maintaining the balance and stability of the entire metal C-type sealing ring. Thirdly, the C-shaped sealing layer can adapt to the slight unevenness of the sealing surface during compression and provide good fit. This design allows the sealing layer to maintain a good sealing effect even with a low initial preload, which is particularly suitable for working conditions with microscopic irregularities or material expansion / contraction due to temperature changes. The middle layer is also C-shaped, which can provide additional elastic buffering during compression, further enhancing the adaptability between the sealing layer and the spring layer. This buffering effect helps to reduce the direct pressure on the spring layer and provides a certain absorption and adjustment function when the pressure changes.

[0023] Furthermore, the spring layer is made of high-strength metal materials, which at least include stainless steel (such as 304, 316 stainless steel, which have good corrosion resistance and mechanical strength, suitable for most industrial environments), carbon steel (used after anti-corrosion treatment, with high strength and cost-effectiveness) or nickel-based alloys (such as Inconel, which provides excellent high temperature resistance and corrosion resistance, suitable for extreme working conditions).

[0024] It should be noted that, in combination with the above description, since the spring layer includes a plurality of spirally spliced ​​flat wire springs, the design of the intermediate layer and the sealing layer is adapted to the spring layer. The shape of the intermediate layer matches the shape of the spring layer, and the second inner sealing surface of the intermediate layer fits the flat wire spring so that there is no gap in the spring layer and the pressure is evenly distributed; the shape of the sealing layer matches the shape of the spring layer, and the first inner sealing surface of the sealing layer fits the shape of the flat wire spring.

[0025] Specifically, in terms of the shapes of the middle layer and the sealing layer, since the spring layer includes a spirally spliced ​​flat wire spring, the middle layer needs to be designed to have a shape that better matches the flat wire spring. For example, the second inner sealing surface of the middle layer may need to have a flat or specific shape so that it fits the flat wire spring to ensure that there is no gap and uniform pressure distribution. Correspondingly, the sealing layer also needs to consider matching with the flat wire spring. When designing the C-shaped sealing layer, the first inner sealing surface needs to fit the shape of the flat wire spring to ensure the sealing effect and structural stability.

[0026] Furthermore, in the installation and manufacture of the intermediate layer and the sealing layer, since the spring layer includes a spirally spliced ​​flat wire spring, special attention needs to be paid to maintaining the alignment and tight fit of the flat wire spring during the installation of the intermediate layer. This may increase the complexity of the installation and the requirements for manufacturing accuracy. Accordingly, in order to ensure a good match with the flat wire spring during the installation of the sealing layer, the size and shape of the sealing layer need to be strictly controlled during the manufacture to avoid mismatching or poor sealing during installation.

[0027] Furthermore, in terms of material selection and durability of the middle layer and the sealing layer, in order to ensure durability under long-term contact with the flat wire spring, the material of the middle layer may need to have high wear resistance and pressure resistance. The material selection needs to comprehensively consider the shape and pressure distribution characteristics of the spring layer. Accordingly, the material of the sealing layer needs to be able to maintain elasticity and sealing performance for a long time while withstanding the uniform pressure applied by the flat wire spring. The material selection and processing technology need to take these factors into account to ensure the long-term stability of the sealing layer.

[0028] Furthermore, since the flat wire spring and other components are affected by temperature changes during operation, thermal expansion and contraction may cause changes in the relative position and pressure between components. Therefore, the design of the intermediate layer and the sealing layer needs to take these factors into consideration to ensure that good sealing effect and structural stability are maintained under different temperature conditions.

[0029] The method provided in this embodiment is to design the spring layer as a spirally spliced ​​flat wire spring, and to adapt the design of the intermediate layer and the sealing layer to the spring layer. On the one hand, the sealing performance of the metal C-type sealing ring is improved: the intermediate layer better absorbs and disperses the pressure difference between the two flange sealing surfaces, reducing the risk of sealing failure due to uneven pressure, and the continuous pressure provided by the flat wire spring helps the sealing layer to better contact the flange sealing surface, forming a more reliable seal, which can enhance the sealing effect of the sealing layer and reduce the possibility of gas leakage. On the other hand, the durability of the metal C-type sealing ring is improved: because the flat wire spring can more effectively disperse the pressure applied to the intermediate layer, deformation or damage caused by excessive local pressure is avoided. This improves the durability and stability of the intermediate layer. The uniform pressure distribution reduces the possibility of local wear or failure of the sealing layer during long-term use, and extends the service life of the sealing layer. On the third hand, the installation and maintenance work of the metal C-type sealing ring is reduced: due to the close fit of the flat wire spring, the intermediate layer is easier to maintain the correct position and shape during installation, reducing the adjustment and calibration work during the installation process. Due to the uniform pressure distribution and compact structure, the sealing layer is not easy to loosen or shift after installation, reducing the frequency of maintenance and adjustment.

[0030] It should be noted that the sealing layer is used to seal the metal C-type sealing ring to prevent gas leakage in the metal C-type sealing ring. The middle layer is used to absorb the pressure difference between the two flange sealing surfaces to protect the sealing layer and the flange sealing surface. The spring layer is used to provide a supporting force to the sealing layer during the compression process of the metal C-type sealing ring, so that the material of the sealing layer is deformed and fills the tiny capillary leakage channel of the flange sealing surface.

[0031] In specific implementation, the sealing layer, the middle layer and the spring layer are placed in sequence between the flanges, so that the first outer sealing surface of the sealing layer contacts the flange, the first inner sealing surface contacts the second outer sealing surface of the middle layer, and the second inner sealing surface of the middle layer contacts the spring layer. The flange is compressed by bolts or other fasteners, the metal C-type sealing ring begins to be stressed, and the flat wire spring is compressed and generates a supporting reaction force. The supporting reaction force of the flat wire spring pushes the sealing layer and the middle layer to deform evenly, so that the first outer sealing surface and the first inner sealing surface of the sealing layer are tightly fitted on the flange and the middle layer, and the second outer sealing surface and the second inner sealing surface of the middle layer are tightly contacted with the sealing layer and the flat wire spring respectively. Under the action of the supporting reaction force, the sealing layer deforms and seals the metal C-type sealing ring, fills the tiny capillary leakage channel of the flange sealing surface, forms a good seal, and prevents internal gas leakage. The middle layer absorbs the pressure difference between the flange sealing surfaces, protects the sealing layer and the flange sealing surface, and ensures the sealing effect.

[0032] Optionally, the spring layer includes a plurality of spirally spliced ​​flat wire springs, which are staggered to form a first closed surface relative to the middle layer and a second closed surface relative to the inside of the metal C-shaped sealing ring; the first closed surface and the second closed surface are used to provide continuous linear pressure when the flat wire spring is compressed.

[0033] The metal C-type sealing ring provided in this embodiment, on the one hand, can avoid stress concentration in the overlapping parts of the multiple flat wire springs by staggering the multiple flat wire springs, can provide more uniform compression performance, and avoid damage to the flange sealing surface caused by stress concentration of the support reaction force generated by the flat wire spring during compression. On the second hand, due to the continuity of the spiral structure and the larger contact area of ​​the flat wire spring compared to the traditional round wire spring, the flat wire spring can provide a relatively uniform reaction force during the entire compression process, thereby generating a continuous linear pressure, which enhances the uniformity and continuity of the pressure. On the third hand, due to the high elasticity of the flat wire spring and the continuous linear pressure provided by the flat wire spring, it is ensured that the flat wire spring can still produce significant elastic deformation under a relatively small compression force. Even if the bolt preload is low, the flat wire spring can still respond quickly and provide sufficient reaction force, which is evenly distributed on the entire sealing surface, ensuring good sealing and achieving good sealing under a relatively low bolt preload.

[0034] Optionally, the metal C-type sealing ring also includes a detection module, wherein the detection module is used to perform gas leakage detection on the sealing layer of the metal C-type sealing ring to obtain a gas leakage rate when the sealing stress of the sealing ring reaches a preset value; when the leakage rate is greater than a preset threshold, it is determined that the sealing performance of the metal C-type sealing ring is poor; when the leakage rate is less than the preset threshold, it is determined that the sealing performance of the metal C-type sealing ring is good.

[0035] Specifically, the preset value is set according to actual needs. In this embodiment, the specific value of the preset value is not limited. It should be noted that the size of the preset value is related to the actual working condition of the metal C-type sealing ring under working condition. For example, in one embodiment, in general industrial application scenarios, the preset value is 100Mpa. In high-pressure application scenarios, the preset value is 200MPa. In extremely high-pressure application scenarios, the preset value is 500Mpa. The preset threshold is set according to actual needs. In this embodiment, the specific value of the preset threshold is not limited. It should be noted that the size of the preset threshold is related to the gas to be detected. For helium leak detection, the selection of the preset threshold is extremely important. For example, in one embodiment, when the gas to be detected is helium, the preset threshold is 10-12Pa·m3 / s.

[0036] In specific implementation, the sealing stress of the metal C-type sealing ring is read based on the pressure sensor installed on the contact surface of the metal C-type sealing ring. When it is determined that the sealing stress reaches the preset value, the detection module measures the gas leakage rate based on a highly sensitive leak detection instrument (such as a helium leak detector). Based on the size relationship between the leakage rate and the preset threshold, the sealing effect of the metal C-type sealing ring is determined. When the leakage rate is greater than the preset threshold, it is determined that the sealing performance of the metal C-type sealing ring is poor. First, the operation of the equipment related to the metal C-type sealing ring is immediately stopped to prevent further leakage and possible equipment damage. Further, the metal C-type sealing ring and its surrounding components are inspected in detail to confirm the specific cause of the sealing failure (including wear, aging, improper installation, material defects, etc. of the metal C-type sealing ring). The metal C-type sealing ring is repaired according to the inspection results. If the metal C-type sealing ring is damaged or aged, it is usually necessary to replace a new metal C-type sealing ring. If the problem is not very serious, its sealing performance can be restored by repair. When the leakage rate is less than the preset threshold, it is determined that the sealing performance of the metal C-type sealing ring is good and there is no need to replace the metal C-type sealing ring.

[0037] The metal C-type sealing ring provided in this embodiment includes a sealing layer, an intermediate layer and a spring layer. Among them, the spring in the spring layer adopts a compact spiral spring wound with flat spring steel wire. When the metal C-type sealing ring is compressed, the spring layer provides a supporting reaction force to the sealing layer to deform the material of the sealing layer and fill the tiny capillary leakage channel of the flange sealing surface. On the one hand, by staggering the plurality of flat wire springs, stress concentration in the overlapping parts of the plurality of flat wire springs can be avoided, and more uniform compression performance can be provided, avoiding damage to the flange sealing surface caused by stress concentration of the supporting reaction force generated by the flat wire spring during compression. On the other hand, due to the continuity of the spiral structure and the larger contact area of ​​the flat wire spring compared to the traditional round wire spring, the flat wire spring can provide a relatively uniform reaction force during the entire compression process, thereby generating a continuous linear pressure and enhancing the uniformity and continuity of the pressure. Thirdly, due to the high elasticity of the flat wire spring and the continuous linear pressure provided by the flat wire spring, the flat wire spring can still produce significant elastic deformation under a smaller compression force. Even if the bolt preload is low, the flat wire spring can still respond quickly and provide sufficient reaction force, which is evenly distributed on the entire sealing surface, ensuring good sealing and achieving good sealing under lower bolt preload.

[0038] Corresponding to the aforementioned embodiment of a metal C-type sealing ring, the present application also provides an embodiment of a sealing method.

[0039] Figure 3 This is a flow chart of the first embodiment of the sealing method provided by this application. Please refer to Figure 3The method provided in this embodiment is applied to the metal C-type sealing ring provided in the first aspect of the present application; the method comprises: S301. When the metal C-shaped sealing ring is compressed, the spring layer provides a supporting reaction force to the sealing layer, so that the material of the sealing layer is deformed.

[0040] Specifically, the flange is compressed by bolts or other fasteners, the metal C-type sealing ring begins to be stressed, the spring layer is compressed and generates a supporting reaction force, and the supporting reaction force of the spring layer pushes the material of the sealing layer to deform.

[0041] S302, the sealing layer fills the tiny capillary leakage channels of the flange sealing surface and seals the gas in the metal C-shaped sealing ring.

[0042] Specifically, the supporting reaction force of the spring layer pushes the material of the sealing layer to deform, so that the first outer sealing surface and the first inner sealing surface of the sealing layer are closely attached to the flange and the middle layer, and the second outer sealing surface and the second inner sealing surface of the middle layer are closely contacted with the sealing layer and the spring layer respectively. Under the action of the supporting reaction force, the sealing layer deforms and seals the metal C-type sealing ring, filling the tiny capillary leakage channel of the flange sealing surface, forming a good seal to prevent internal gas leakage.

[0043] S303. The middle layer absorbs the pressure difference between the two flange sealing surfaces and provides a buffering effect to protect the sealing layer and the flange sealing surfaces.

[0044] Specifically, the middle layer is used to absorb and disperse the uneven pressure between the two flange sealing surfaces, and helps the metal C-type sealing ring maintain stability by absorbing the pressure difference and avoiding local stress concentration. Furthermore, the middle layer provides a buffer through its flexible or elastic properties to reduce pressure and mitigate the negative impact caused by the flange connection being not completely parallel or other installation errors. The middle layer reduces the pressure of direct contact between the flange sealing surface and the sealing layer, thereby reducing wear and damage, and provides a transition area so that the sealing layer can contact the flange sealing surface more evenly, extending the life of the metal C-type sealing ring.

[0045] The method of this embodiment can be used to execute Figure 1 The steps, specific implementation principles and implementation processes of the device embodiment shown are similar and will not be repeated here.

[0046] The implementation process of the functions and effects of each unit in the above-mentioned device is specifically described in the implementation process of the corresponding steps in the above-mentioned method, and will not be repeated here.

[0047] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The device embodiment described above is only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present application scheme. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0048] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A metal C-shaped sealing ring, characterized in that: The metal C-shaped sealing ring comprises a sealing layer, an intermediate layer and a spring layer; wherein the sealing layer is located at the outermost side of the metal C-shaped sealing ring, the spring layer is located at the innermost side of the metal C-shaped sealing ring, and the intermediate layer is sandwiched between the sealing layer and the spring layer; the sealing layer and the intermediate layer are C-shaped with a notch, and the spring layer is a closed circle without a notch; The sealing layer contacts the flange sealing surface and is used to seal the metal C-shaped sealing ring to prevent gas leakage in the metal C-shaped sealing ring; The intermediate layer is used to absorb the pressure difference between the two flange sealing surfaces to protect the sealing layer and the flange sealing surfaces; The spring layer includes a plurality of spirally spliced ​​flat wire springs, the outer sides of the plurality of flat wire springs form a closed surface relative to the middle layer, and the spring layer is used to provide a supporting reaction force to the sealing layer during the compression process of the metal C-type sealing ring, so as to deform the material of the sealing layer and fill the tiny capillary leakage channel of the flange sealing surface.

2. The metal C-shaped sealing ring according to claim 1, characterized in that: The spring layer comprises: A plurality of spirally spliced ​​flat wire springs, wherein the plurality of flat wire springs are staggered to form a first closed surface relative to the middle layer and a second closed surface relative to the inside of the metal C-shaped sealing ring; The first closed surface and the second closed surface are used to provide continuous linear pressure when the flat wire spring is compressed.

3. The metal C-shaped sealing ring according to claim 1, characterized in that: The metal C-shaped sealing ring also includes a detection module, wherein: The detection module is used to perform gas leakage detection on the sealing layer of the metal C-shaped sealing ring to obtain the gas leakage rate when the sealing stress of the sealing ring reaches a preset value; When the leakage rate is greater than a preset threshold, determining that the sealing performance of the metal C-type sealing ring is poor; When the leakage rate is less than a preset threshold, it is determined that the sealing performance of the metal C-type sealing ring is good.

4. The metal C-shaped sealing ring according to claim 1, characterized in that: The cross section of the sealing layer is C-shaped, and includes a first outer sealing surface and a first inner sealing surface; the cross section of the intermediate layer is C-shaped, and includes a second outer sealing surface and a second inner sealing surface; The shape of the intermediate layer matches the shape of the spring layer, and the second inner sealing surface fits the flat wire spring so that there is no gap in the spring layer and the pressure is evenly distributed; The shape of the sealing layer matches the shape of the spring layer, and the first inner sealing surface fits the shape of the flat wire spring.

5. The metal C-shaped sealing ring according to claim 1, characterized in that: The circumferential opening position of the sealing layer completely corresponds to the circumferential opening position of the intermediate layer, and both openings are C-shaped.

6. The metal C-shaped sealing ring according to claim 1, characterized in that: The sealing layer is made of a material with high elasticity and high corrosion resistance, which at least includes polytetrafluoroethylene, flexible graphite, a metal composite material or a nickel-based alloy.

7. The metal C-shaped sealing ring according to claim 1, characterized in that: The intermediate layer is made of a flexible material with buffering performance, which at least includes flexible graphite, rubber and an elastomer or polymer composite material.

8. The metal C-shaped sealing ring according to claim 1, characterized in that: The spring layer is made of high-strength metal material, which at least includes stainless steel, carbon steel or nickel-based alloy.

9. A sealing method, characterized in that: The sealing method is applied to the metal C-type sealing ring according to any one of claims 1 to 8; the method comprises: When the metal C-shaped sealing ring is compressed, the spring layer provides a supporting reaction force to the sealing layer, so that the material of the sealing layer is deformed; The sealing layer fills the tiny capillary leakage channels on the flange sealing surface and seals the gas in the metal C-shaped sealing ring; The intermediate layer absorbs the pressure difference between the two flange sealing surfaces and provides a buffering effect to protect the sealing layer and the flange sealing surfaces.

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