A sealing device for pipeline flange sealing and its application

Abstract

The present invention provides a sealing device for sealing pipeline flanges, comprising a gasket body, a pipeline through-hole provided in the middle of the gasket body, a first protrusion structure provided on one side of the gasket body, and a second protrusion structure provided on the other side of the gasket body. The first protrusion structure is in line contact with the front pipeline flange, and the second protrusion structure is in line contact with the rear pipeline flange, and both the first protrusion structure and the second protrusion structure are coaxial with the pipeline through-hole. The sealing device of the present invention has a simple structure, a simple processing technology, and low cost. By designing the sealing device, the two end faces of the sealing device are in line contact between the front pipeline flange and the rear pipeline flange, respectively, and a seal is formed by the line contact, thereby completely preventing the gas in the pipeline from leaking at the pipeline connection.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline / pipeline sealing devices, and in particular to a sealing device for pipeline flange sealing and application thereof. Background Art

[0002] Pipelines / pipelines are used to transport gas or liquid. Different equipment and systems contain one or more pipelines / pipelines. Currently, most adjacent pipelines / pipelines are connected by flanges. For example, a gas turbine is a high-power, high-performance power machine that generates high-temperature gas working fluid and outputs it through pipelines to drive the turbine mechanism to continuously perform work. The outer casing of the gas turbine is equipped with many exhaust pipelines and gas supply pipelines, most of which are connected by flanges.

[0003] Because the high-temperature gas working fluid generated by gas turbines needs to be transported through exhaust or transmission pipelines, the flange connections on these pipelines often become the primary areas for gas leakage. Leakage of high-temperature gas working fluid can, on the one hand, reduce the overall performance and economic efficiency of the gas turbine; on the other hand, as the leakage volume continues to increase, the high-temperature, high-pressure gas working fluid can cause high temperatures to scorch the area where it leaks, causing damage to components and accessories, and even affecting the normal operation of the gas turbine, resulting in significant economic losses. Therefore, it is necessary to seal the flange connections on the pipelines to prevent leakage.

[0004] Currently, pipeline seals generally have typical static sealing characteristics. The flanges of connected pipelines are mostly sealed with contact-type sealing structures, including non-metallic sealing gaskets and metal-coated non-metallic component sealing gaskets. Among them, non-metallic sealing gaskets are low-cost, but they have difficulty maintaining their original physical properties when exposed to high temperature and high pressure for a long time. Metal-coated non-metallic component sealing gaskets, while having a certain degree of ductility, can expand and fill the flange gap during long-term operation to improve the sealing effect. However, their complex structure and processing technology are complex, and the cost is high.

[0005] In view of this, it is necessary to improve the sealing structure between the flanges of the existing pipelines. Summary of the Invention

[0006] In order to solve the problems of high cost, complex structure and processing, and poor sealing of the above-mentioned pipeline flange sealing device, the present invention provides a sealing device for sealing the pipeline flange with a simple structure, simple processing technology, low cost, and good sealing effect maintained even after long-term operation.

[0007] The sealing device of the present invention is used for sealing between pipeline flanges of various structures, and is particularly suitable for sealing high-temperature pipeline flanges, such as the sealing of pipeline flanges of gas turbine equipment. After the sealing device is applied, it can avoid pipeline leakage problems during long-term normal operation of the gas turbine or before normal maintenance, thereby ensuring the operating efficiency of the gas turbine.

[0008] The technical solution for achieving the purpose of the invention is as follows: A sealing device for pipeline flange sealing includes a gasket body, a pipeline through hole is provided in the middle of the gasket body, a first protrusion structure is provided on one side of the gasket body, and a second protrusion structure is provided on the other side of the gasket body.

[0009] The first protruding structure is in line contact with the front pipeline flange, the second protruding structure is in line contact with the rear pipeline flange, and both the first protruding structure and the second protruding structure are coaxial with the pipeline through hole.

[0010] By providing a sealing device between the front-end pipeline flange and the rear-end pipeline flange connected thereto, and designing the sealing device so that the two end faces of the sealing device are in line contact with the front-end pipeline flange and the rear-end pipeline flange respectively, a seal is formed by line contact, thereby completely preventing the gas in the pipeline from leaking at the pipeline connection.

[0011] Among them, the first protrusion structure and the second protrusion structure have the same structure, both of which include a comb ring, and the comb ring includes a convex tip portion, and the top of the convex tip portion is in linear contact with the front pipeline flange or the front and rear pipeline flanges.

[0012] In a preferred embodiment of the present invention, the height of the convex portion is a and the thickness of the gasket body is b, where 0.5 ≤ a: b ≤ 1.0. When the ratio of the height of the convex portion a to the thickness of the gasket body b is less than 0.5, the convex portion of the sealing device is squeezed by the tightening force of fasteners (such as bolts) between the sealing device and the front or rear pipeline flange during installation, and the convex portion of the sealing device is likely to completely flatten, thereby losing its comb-tooth feature. When the ratio of the height of the convex portion a to the thickness of the gasket body b is greater than 1.0, the height of the convex portion is too high, making it difficult to ensure consistent deformation of the convex portion during installation, and leakage is likely to occur. Therefore, after multiple tests and verification, it was found that the sealing effect of the pipeline flange is optimal when the ratio of the height of the convex portion a to the thickness of the gasket body b is between 0.5 and 1.0.

[0013] In a preferred embodiment of the present invention, there is one grating ring for each of the first and second convex structures. When there is one grating ring for each of the first and second convex structures, there is a single line of contact between the first convex structure and the front pipe flange, and between the second convex structure and the rear pipe flange. This line of contact seal prevents gas leakage from the pipe connection, thereby improving the sealing performance of the pipe.

[0014] In a preferred embodiment of the present invention, there are at least two comb tooth rings of the first raised structure, and there is a distance between adjacent comb tooth rings. The front-end pipeline flange contacts the two adjacent comb tooth rings of the first raised structure to form a first annular sealing cavity, and there is at least one first annular sealing cavity. When there are at least two comb tooth rings of the first raised structure, they can form at least two sealing lines when they are in contact and connected with the front-end pipeline flange, and at least one first annular sealing cavity is formed between the adjacent sealing lines and the front-end pipeline flange. During operation, a small amount of gas or liquid enters the first annular sealing cavity through the sealing lines close to the pipeline through-hole in turn, and a backflow can also be formed in the first annular sealing cavity, which can further effectively reduce the leakage of gas or liquid and greatly extend the working life of the equipment.

[0015] In a preferred embodiment of the present invention, there are at least two grating rings of the second raised structure, and there is a distance between adjacent grating rings. The rear end pipeline flange contacts the two adjacent grating rings of the second raised structure to form a second annular sealing cavity, and there is at least one second annular sealing cavity. When there are at least two grating rings of the second raised structure, they can form at least two sealing lines when they are in contact and connected with the rear end pipeline flange, and at least one second annular sealing cavity is formed between the adjacent sealing lines and the rear end pipeline flange. During operation, a small amount of gas or liquid enters the second annular sealing cavity through the sealing lines close to the pipeline through-hole in turn, and a backflow can be formed in the second annular sealing cavity, which can further effectively reduce the leakage of gas or liquid, thereby greatly extending the working life of the equipment.

[0016] Preferably, in the present invention, as an improvement to the adjacent comb rings of the first protruding structure and the second protruding structure, the spacing between adjacent comb rings is ≥1.5mm. When the spacing between adjacent comb rings is less than 1.5mm, adverse effects are produced, such as (the pressure of the first annular sealing chamber or the second annular sealing chamber changes). When the spacing between adjacent comb rings is less than 1.5mm, the annular sealing chamber formed is also smaller, and the gas or liquid is not conducive to forming an obvious reflux vortex structure therein, and the reflux vortex structure is the main aerodynamic principle to prevent gas or liquid leakage. If the reflux vortex cannot be formed, the fluid will not be retained in the annular sealing chamber, and the sealing effect is weakened.

[0017] Among them, a number of mounting holes are also provided on the outer periphery of the gasket body. The setting of the mounting holes can facilitate the connection of the sealing device with the front-end pipeline flange and the rear-end pipeline flange by bolts.

[0018] The present invention also provides a seal for a pipeline flange of a gas turbine, and the sealing device is used to seal and connect adjacent pipeline flanges of the gas turbine.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention designs a sealing device by providing a first protrusion structure and a second protrusion structure on the gasket body, and at the same time making the first protrusion structure and the second protrusion structure in line contact with the flanges connected at both ends of adjacent pipelines. The line contact seal is formed, thereby completely preventing the gas in the pipeline from leaking at the pipeline connection.

[0021] 2. By designing the first protrusion structure and the second protrusion structure, at least two sealing lines and at least one annular sealing cavity (i.e., the first annular sealing cavity and the second annular sealing cavity) are formed between the first protrusion structure and the second protrusion structure and the flange lines connecting the two ends of adjacent pipelines, thereby further ensuring the sealing between the pipeline flanges, avoiding gas or liquid leakage, and greatly extending the working life of the equipment.

[0022] 3. The overall processing technology of the sealing device is simple and the service life is long. Through actual application on gas turbines, it can achieve a quality life of 30,000 hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are merely for the purpose of more clearly illustrating the embodiments of the present invention or the technical solutions in the prior art. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0024] Figure 1 A top view of the sealing device of the present invention;

[0025] Figure 2 BB is a cross-sectional view of the sealing device of Example 1 of the present invention;

[0026] Among them, 1. gasket body; 2. pipeline through hole; 3. first protrusion structure; 4. second protrusion structure; 5. comb ring; 6. convex tip; 7. first annular sealing cavity; 8. second annular sealing cavity; 9. mounting hole; 10. recessed portion. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as the description proceeds. However, these embodiments are merely exemplary and do not constitute any limitation to the scope of the present invention. It should be understood by those skilled in the art that the details and forms of the technical solutions of the present invention may be modified or replaced without departing from the spirit and scope of the present invention, and such modifications and replacements fall within the scope of protection of the present invention.

[0028] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0029] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0030] Example 1:

[0031] Please refer to Figure 1 As shown, a sealing device for sealing a pipeline flange. In this embodiment, the sealing device includes a gasket body 1, a pipeline through-hole 2 being provided in the middle of the gasket body 1, a first raised structure 3 being provided on one side of the gasket body 1, and a second raised structure 4 being provided on the other side of the gasket body 1. The first raised structure 3 is in line contact with the front pipeline flange, and the second raised structure 4 is in line contact with the rear pipeline flange. Both the first raised structure 3 and the second raised structure 4 are coaxial with the pipeline through-hole 2.

[0032] The overall shape of the gasket body 1 can be rectangular, square, or circular, and its specific shape can be matched to the pipe flange on the pipeline. The gasket body 1 can be made of metal or non-metallic materials, such as L306 stainless steel or L304 stainless steel, or plastic materials such as PP, PVC, and HDPE, depending on the usage environment. Its thickness can be designed based on the actual usage environment.

[0033] Among them, the pipeline through hole 2 is used for the passage of gas or liquid in the pipeline. Its size can be changed according to the inner diameter of the matching pipeline. The diameter of the pipeline through hole 2 is consistent with the inner diameter of the matching pipelines at both ends. For example, when the pipeline is a DN65 pipeline, the diameter of the pipeline through hole 2 is also DN65.

[0034] Among them, such as Figure 1 As shown, the first protruding structure 3 and the second protruding structure 4 have the same structure. Both the first protruding structure 3 and the second protruding structure 4 include a comb ring 5, and the comb ring 5 includes a convex tip 6, and the top of the convex tip 6 is in linear contact with the front pipeline flange or the front and rear pipeline flanges.

[0035] In this embodiment, the protruding tips 6 on the first and second protruding structures 3 and 4 are protrusions on the gasket body 1 that can form line contact with the front or rear pipeline flange. Specifically, the height of the protruding tips 6 is a, and the thickness of the gasket body 1 is b, where 0.5 ≤ a: b ≤ 1.0. When the ratio of the height a of the protruding tips 6 to the thickness b of the gasket body 1 is less than 0.5, the sealing device and the front or rear pipeline flange are squeezed by the tightening force of fasteners (such as bolts) during installation, and the protruding tips 6 of the sealing device are likely to completely flatten, thereby losing their comb-tooth characteristics. When the ratio of the height a of the protruding tips 6 to the thickness b of the gasket body 1 is greater than 1.0, the height of the protruding tips 6 is too high, making it difficult to ensure uniform deformation of the protruding tips 6 during installation, and leaks are more likely to occur. Therefore, after multiple tests, it was found that the sealing effect of the pipeline flange is optimal when the ratio of the height a of the protruding tips 6 to the thickness b of the gasket body 1 is between 0.5 and 1.0. For example, when the thickness b of the gasket body 1 is 2.5 mm, the height a of the protruding tip 6 can be selected to be 0.5 to 2.5 mm according to different application environments.

[0036] In this embodiment, the radius of the first protruding structure 3 and the radius of the second protruding structure 4 may be unequal or equal. When the radius of the first protruding structure 3 and the radius of the second protruding structure 4 are the same, the radius of the first protruding structure 3 and the second protruding structure 4 is greater than 1.1 times the radius of the pipeline through hole 2. Figure 2 As shown, when the radii of the first protruding structure 3 and the second protruding structure 4 are not equal, the radius of the first protruding structure 3 or the second protruding structure 4 close to the pipeline through hole 2 is greater than 1.1 times the radius of the pipeline through hole 2, and the radius of the second protruding structure 4 or the first protruding structure 3 away from the pipeline through hole 2 is greater than 1.2 times the radius of the pipeline through hole 2.

[0037] In this embodiment, the number of tooth rings 5 on the first protruding structure 3 and the second protruding structure 4 is adjusted according to the actual application environment. Specifically, there can be one or more tooth rings 5 on the first protruding structure 3 and the second protruding structure 4; the number of tooth rings 5 on the first protruding structure 3 and the second protruding structure 4 can be the same or different.

[0038] For example, in one embodiment, each of the first protruding structure 3 and the second protruding structure 4 has one tooth ring 5. When each of the first protruding structure 3 and the second protruding structure 4 has one tooth ring 5, there is one line of contact between the first protruding structure 3 and the front pipeline flange, and one line of contact between the second protruding structure 4 and the rear pipeline flange. This line of contact seal can prevent gas leakage from the pipeline connection, thereby improving the sealing performance of the pipeline.

[0039] In a second embodiment, if Figure 2As shown, the first protruding structure 3 has at least two tooth rings 5, and there is a distance between adjacent tooth rings 5. The front-end pipeline flange contacts the two adjacent tooth rings 5 of the first protruding structure 3 to form a first annular sealing cavity 7, and there is at least one first annular sealing cavity 7. When there are at least two tooth rings 5 of the first protruding structure 3, they can form at least two sealing lines when in contact and connected with the front-end pipeline flange, and at least one first annular sealing cavity 7 is formed between the adjacent sealing lines and the front-end pipeline flange. During operation, a small amount of gas or liquid enters the first annular sealing cavity 7 through the sealing lines close to the pipeline through-hole 2 in sequence, and a backflow can also be formed in the first annular sealing cavity 7, which can further effectively reduce the leakage of gas or liquid and greatly extend the working life of the equipment. Among them, there is at least one tooth ring 5 of the second protruding structure 4.

[0040] In a third embodiment, as Figure 2 As shown, the second protruding structure 4 has at least two tooth rings 5, and there is a distance between adjacent tooth rings 5. The rear-end pipeline flange contacts the two adjacent tooth rings 5 of the second protruding structure 4 to form a second annular sealing chamber 8, and there is at least one second annular sealing chamber 8. When there are at least two tooth rings 5 of the second protruding structure 4, they can form at least two sealing lines when in contact and connected with the rear-end pipeline flange, and at least one second annular sealing chamber 8 is formed between the adjacent sealing lines and the rear-end pipeline flange. During operation, a small amount of gas or liquid enters the second annular sealing chamber 8 through the sealing lines close to the pipeline through-hole 2 in sequence, and a backflow can also be formed in the second annular sealing chamber 8, which can further effectively reduce the leakage of gas or liquid and greatly extend the working life of the equipment. Among them, there is at least one tooth ring 5 of the first protruding structure 3.

[0041] In the above-mentioned second and third embodiments, the spacing between adjacent comb tooth rings 5 of the first protruding structure 3 is ≥1.5mm, and the spacing between adjacent comb tooth rings 5 of the second protruding structure 4 is ≥1.5mm. When the spacing between adjacent comb tooth rings 5 is less than 1.5mm, the annular sealed chamber (the first annular sealed chamber 7 and the second annular sealed chamber 8) formed is also smaller, and the gas or liquid is not conducive to forming an obvious reflux vortex structure therein, and the reflux vortex structure is the main aerodynamic principle to prevent gas or liquid leakage. If a reflux vortex cannot be formed, the fluid will not be retained in the annular sealed chamber, and the sealing effect is weakened. Specifically, the spacing between adjacent comb tooth rings 5 of the first protruding structure 3 and the spacing between adjacent comb tooth rings 5 of the second protruding structure 4 can be equal or unequal.

[0042] Among them, such as Figure 1As shown, the outer periphery of the gasket body 1 is also provided with several mounting holes 9. The provision of mounting holes 9 facilitates bolt connection of the sealing device to the front and rear pipeline flanges. In this embodiment, the location of the mounting holes 9 coincides with the location of the bolt holes on the corresponding pipeline end flanges. During installation, bolts are passed through the pipeline end flanges and the mounting holes 9 on the gasket body 1 and tightened with nuts to secure the sealing device between the two pipeline end flanges. The mounting holes 9 are sized to accommodate bolts with metric thread sizes ranging from M5 to M10 and imperial thread sizes ranging from 0.25 to 0.375 inches.

[0043] By providing a sealing device between the front-end pipeline flange and the rear-end pipeline flange connected thereto, and designing the sealing device so that the two end faces of the sealing device are in line contact with the front-end pipeline flange and the rear-end pipeline flange respectively, a seal is formed by line contact, thereby completely preventing the gas in the pipeline from leaking at the pipeline connection.

[0044] Example 2:

[0045] Please refer to Figure 1 A sealing device for sealing a pipeline flange is shown. In this embodiment, the sealing device is used to seal a pipeline flange of a gas turbine. The sealing device includes a gasket body 1, a pipeline through-hole 2 being provided in the middle of the gasket body 1, a first raised structure 3 being provided on one side of the gasket body 1, and a second raised structure 4 being provided on the other side of the gasket body 1. The first raised structure 3 is in line contact with the front pipeline flange, while the second raised structure 4 is in line contact with the rear pipeline flange. Both the first raised structure 3 and the second raised structure 4 are coaxial with the pipeline through-hole 2.

[0046] The gasket body 1 can be made of a metal material, such as L306 stainless steel or L304 stainless steel. Its thickness can be designed based on the operating environment. For example, in a gas turbine, the sealing device's fastener torque must be maintained within the range of 6-15 Nm. Therefore, the gasket body 1 is designed to have a thickness between 1.0 and 2.5 mm.

[0047] Among them, the pipeline through hole 2 is used for the passage of high-temperature gas in the pipeline. Its size can be changed according to the inner diameter of the matching pipeline. The diameter of the pipeline through hole 2 is consistent with the inner diameter of the matching pipelines at both ends. For example, when the pipeline is a DN65 pipeline, the diameter of the pipeline through hole 2 is also DN65.

[0048] Among them, such as Figure 2As shown, the first protrusion structure 3 and the second protrusion structure 4 have the same structure. Both the first protrusion structure 3 and the second protrusion structure 4 include a grating ring 5, and the grating ring 5 includes a convex portion 6 and a concave portion 10. The top of the convex portion 6 is in linear contact with the front pipeline flange or the front and rear pipeline flanges. Specifically, during processing, a punching device operates on the gasket body 1, forming the convex portion 6 on one side of the gasket body 1 and the concave portion 10 on the other side. In this embodiment, the concave portion 10 and the convex portion 6 have a triangular structure.

[0049] In this embodiment, the protruding tips 6 on the first and second protruding structures 3 and 4 are protrusions on the gasket body 1 that can form line contact with the front or rear pipeline flange. Specifically, the height of the protruding tips 6 is a, and the thickness of the gasket body 1 is b, where 0.5 ≤ a: b ≤ 1.0. When the ratio of the height a of the protruding tips 6 to the thickness b of the gasket body 1 is less than 0.5, the sealing device and the front or rear pipeline flange are squeezed by the tightening force of fasteners (such as bolts) during installation, and the protruding tips 6 of the sealing device are likely to completely flatten, thereby losing their comb-tooth characteristics. When the ratio of the height a of the protruding tips 6 to the thickness b of the gasket body 1 is greater than 1.0, the height of the protruding tips 6 is too high, making it difficult to ensure uniform deformation of the protruding tips 6 during installation, and leaks are more likely to occur. Therefore, after multiple tests, it was found that the sealing effect of the pipeline flange is optimal when the ratio of the height a of the protruding tips 6 to the thickness b of the gasket body 1 is between 0.5 and 1.0. For example, when the thickness b of the gasket body 1 is 2.5 mm, the height a of the convex portion 6 can be selected to be 0.5 to 2.5 mm according to different application environments. Preferably, the height a of the convex portion 6 is 0.5 to 1.5 mm.

[0050] In this embodiment, if Figure 2 As shown, the radius of the first protrusion structure 3 is not equal to the radius of the second protrusion structure 4. When the radius of the first protrusion structure 3 is not equal to the radius of the second protrusion structure 4, the radius of the first protrusion structure 3 or the second protrusion structure 4 close to the pipeline through hole 2 is greater than 1.1 times the radius of the pipeline through hole 2, and the radius of the second protrusion structure 4 or the first protrusion structure 3 far from the pipeline through hole 2 is greater than 1.2 times the radius of the pipeline through hole 2.

[0051] In this embodiment, the number of tooth rings 5 on the first protruding structure 3 and the second protruding structure 4 is adjusted according to the actual application environment. Specifically, there can be one or more tooth rings 5 on the first protruding structure 3 and the second protruding structure 4; the number of tooth rings 5 on the first protruding structure 3 and the second protruding structure 4 can be the same or different.

[0052] For example, in one embodiment, each of the first protruding structure 3 and the second protruding structure 4 has one tooth ring 5. When each of the first protruding structure 3 and the second protruding structure 4 has one tooth ring 5, there is a single line of contact between the first protruding structure 3 and the front-end pipeline flange, and between the second protruding structure 4 and the rear-end pipeline flange. This line of contact seal can prevent gas leakage from the pipeline connection, thereby improving the sealing performance of the pipeline.

[0053] In a second embodiment, if Figure 2 As shown, the first raised structure 3 includes at least two tooth rings 5, with spacing between adjacent tooth rings 5. The front end pipeline flange contacts two adjacent tooth rings 5 of the first raised structure 3, forming a first annular sealing cavity 7. There is at least one first annular sealing cavity 7. When there are at least two tooth rings 5 of the first raised structure 3, they can form at least two sealing lines when in contact and connected with the front end pipeline flange, with at least one first annular sealing cavity 7 formed between adjacent sealing lines and the front end pipeline flange. When the gas turbine operates for extended periods, the high temperature and high pressure environment causes the line contact between the pipe end flange and the sealing device to lose its tightness. During operation, a small amount of high-temperature gas enters the first annular sealing cavity 7, forming backflow within the first annular sealing cavity 7. This effectively reduces gas or liquid leakage and significantly extends the operating life of the equipment. The second raised structure 4 includes at least one tooth ring 5.

[0054] In a third embodiment, as Figure 2 As shown, the second raised structure 4 includes at least two tooth rings 5, with spacing between adjacent tooth rings 5. The rear end pipeline flange contacts two adjacent tooth rings 5 of the second raised structure 4, forming a second annular sealing cavity 8. There is at least one second annular sealing cavity 8. When there are at least two tooth rings 5 of the second raised structure 4, they can form at least two sealing lines when in contact and connected with the rear end pipeline flange, with at least one second annular sealing cavity 8 formed between adjacent sealing lines and the rear end pipeline flange. When the gas turbine operates for extended periods, the high temperature and high pressure environment can cause the line contact between the pipe end flange and the sealing device to lose its tightness. During operation, a small amount of high-temperature gas can enter the second annular sealing cavity 8, creating backflow within the second annular sealing cavity 8. This can further effectively reduce gas or liquid leakage, significantly extending the operating life of the equipment. The first raised structure 3 includes at least one tooth ring 5.

[0055] like Figure 2As shown, in the above-mentioned second and third embodiments, there are two grating rings 5 of the first protruding structure 3 and the second protruding structure 4, which respectively form two sealing lines of line contact and one annular sealing cavity (a first annular sealing cavity 7 and a second annular sealing cavity 8) between the front-end pipeline flange or the rear-end pipeline flange, which can meet the sealing requirements between the gas turbine pipelines used to transmit high-temperature gases.

[0056] In the above-mentioned second and third embodiments, the spacing between adjacent comb tooth rings 5 of the first protruding structure 3 is ≥1.5mm, and the spacing between adjacent comb tooth rings 5 of the second protruding structure 4 is ≥1.5mm. When the spacing between adjacent comb tooth rings 5 is less than 1.5mm, the annular sealed chamber (the first annular sealed chamber 7 and the second annular sealed chamber 8) formed is also smaller, and the gas or liquid is not conducive to forming an obvious reflux vortex structure therein, and the reflux vortex structure is the main aerodynamic principle to prevent gas or liquid leakage. If a reflux vortex cannot be formed, the fluid will not be retained in the annular sealed chamber, and the sealing effect is weakened. Specifically, the spacing between adjacent comb tooth rings 5 of the first protruding structure 3 and the spacing between adjacent comb tooth rings 5 of the second protruding structure 4 can be equal or unequal.

[0057] Among them, such as Figure 1 As shown, a plurality of mounting holes 9 are provided on the outer periphery of the gasket body 1. The provision of the mounting holes 9 can facilitate the connection of the sealing device with the front-end pipeline flange and the rear-end pipeline flange by bolts.

[0058] By providing a sealing device between the front-end pipeline flange and the rear-end pipeline flange connected thereto, and designing the sealing device so that the two end faces of the sealing device are in line contact with the front-end pipeline flange and the rear-end pipeline flange respectively, a seal is formed by line contact, thereby completely preventing the gas in the pipeline from leaking at the pipeline connection.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0060] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A sealing device for sealing a pipeline flange, comprising a gasket body, wherein a pipeline through hole is provided in the middle of the gasket body, and characterized in that: One side of the gasket body is provided with a first protrusion structure, and the other side of the gasket body is provided with a second protrusion structure; The first protruding structure is in line contact with the front pipeline flange, the second protruding structure is in line contact with the rear pipeline flange, and both the first protruding structure and the second protruding structure are coaxial with the pipeline through hole; The first protruding structure has the same structure as the second protruding structure, and includes a comb tooth ring. The comb tooth ring includes a convex tip and a concave tip. A stamping device operates on the gasket body, and a convex tip is formed on one side of the gasket body and a concave tip is formed on the other side by stamping. The top of the convex tip is in line contact with the front-end pipeline flange or the front and rear pipeline flanges. There are at least two comb tooth rings in the first protruding structure and the second protruding structure, and there is a distance between adjacent comb tooth rings. The front-end pipeline flange contacts the two adjacent comb tooth rings of the first protruding structure to form a first annular sealing cavity, and the rear-end pipeline flange contacts the two adjacent comb tooth rings of the second protruding structure to form a second annular sealing cavity. There is at least one first annular sealing cavity and one second annular sealing cavity.

2. The sealing device according to claim 1, characterized in that: The height of the protruding tip is a, and the thickness of the gasket body is b, wherein 0.5≤a:b≤1.

0.

3. The sealing device according to claim 1, wherein: A plurality of mounting holes are also provided on the outer periphery of the gasket body.

4. A gas turbine pipeline flange seal, wherein the sealing device according to claims 1 to 3 is used to seal and connect adjacent pipeline flanges of the gas turbine.

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