Gasket

Abstract

The application relates to a sealing gasket suitable for a device in which a fluid medium is transmitted, the sealing gasket defining an axis and comprising: a metal framework and a non-metal sealing layer covering two axial end faces of the metal framework. The metal framework comprises: a base body which is straight in cross section and has a first center line which is perpendicular to the axis; and two groups of annular teeth, each tooth comprising an inclined section and a curved section, the inclined section being straight in cross section and having a second center line which is inclined to the axis at an angle in the range of 15-50 degrees against the direction of the medium pressure, and the curved section being curved towards the base body in cross section and having a third center line which has at least one radius of curvature in the range of 1-4 mm; and at least one pair of annular bosses, the axial spacing between the vertexes of the bosses away from the base body being 60-90% of the axial thickness of the sealing gasket. The sealing gasket provided by the application is safe to use and has long-term stable sealing performance.

Description

Technical Field

[0001] This application relates to a sealing gasket. Background Technology

[0002] Sealing gaskets with metal skeletons mainly include spiral wound gaskets and traditional toothed gaskets. Spiral wound gaskets consist of multiple metal substrates formed from thin steel strips with a V-shaped cross-section, acting as the metal skeleton. These metal substrates, along with multiple non-metallic packing strips, are alternately wound around the same axis. Therefore, the multiple metal substrates are not a monolithic structure, resulting in lower pressure resistance and resilience of the spiral wound gasket. Traditional toothed gaskets are metal gaskets or metal-non-metal composite gaskets, comprising a metal skeleton with two sets of triangular serrations integrally formed thereon. When a traditional toothed gasket is installed in two flanges of a device, the two sets of triangular serrations contact the end faces of the two flanges, easily damaging them. Furthermore, the two sets of triangular serrations themselves have very low resilience, placing high demands on the manufacturing precision of the flanges and the operating conditions of the device, making them unsuitable for conditions with drastic temperature and pressure fluctuations.

[0003] Currently, some technical improvements have been proposed, such as improving the resilience and preventing damage to the flange by changing the tooth shape of the toothed gasket, or improving the pressure resistance of the toothed gasket by setting bosses. These technical improvements have improved the sealing performance of the toothed gasket to a certain extent.

[0004] However, all the above designs overlook a crucial issue: how to maintain the pressure resistance and resilience of the gasket during use, and how to provide timely sealing compensation in the event of vibration, while preventing the toothed gasket from being crushed. This is especially true in industries such as petroleum, chemical, power, and metallurgy, where pipelines and flanges often operate under conditions of high temperature, high pressure, or fluctuating temperature and pressure. Furthermore, 80% of pipelines and flanges are reused after maintenance, inevitably experiencing some degree of decrease in planar accuracy. To meet the requirements of safe and environmentally friendly production, the sealing performance of gaskets needs further improvement. Summary of the Invention

[0005] One objective of this application is to provide a sealing gasket that is safe to use and has long-term stable sealing performance. Even if the flange plane accuracy decreases and / or the temperature and pressure of the device fluctuate during operation, or even if the sealing gasket is overloaded, the sealing gasket can maintain its compressive strength, resilience, and timely sealing compensation.

[0006] According to one aspect of this application, a sealing gasket is provided suitable for a device in which a fluid medium is transported. The sealing gasket defines an axis and includes: a metal skeleton that is at least partially shaped like a fishback spine in a cross-section including the axis of the sealing gasket; and a non-metallic sealing layer covering two axial end faces of the metal skeleton. The metal skeleton includes: a base that is straight in cross-section and has a first centerline orthogonal to the axis, and the base defines an axial channel through which the fluid medium transported in the device can flow when the sealing gasket is installed, so that the sealing gasket is subjected to medium pressure; and two annular sets of teeth, the two sets of teeth extending from the two axial end faces of the base and symmetrically arranged in cross-section relative to the first centerline, and each set of teeth being spaced apart along the first centerline. Each toothed segment comprises an inclined segment and a curved segment adjacent to the inclined segment. The inclined segment is straight in cross-section and has a second centerline. The second centerline is inclined at an angle of 15°-50° to the axis against the direction of the medium pressure. The curved segment is curved towards the substrate in cross-section and has a third centerline. The third centerline has at least one radius of curvature in the range of 1mm-4mm. The segment also comprises at least one pair of annular bosses, which extend from two axial end faces of the substrate and are symmetrically arranged in cross-section relative to the first centerline. Each boss in the at least one pair of bosses and its adjacent corresponding toothed segment are spaced apart along the first centerline. The axial spacing between the apexes of the at least one pair of bosses away from the substrate is 60%-90% of the axial thickness of the sealing gasket.

[0007] Optionally, the axial height of each tooth is 35%-85% of the maximum axial thickness of a portion of the non-metallic sealing layer covering one of the two axial end faces of the metal skeleton.

[0008] Optionally, the thickness of each toothed plate is substantially constant.

[0009] Optionally, the maximum width of each boss in the cross section along the first centerline is more than 2.5 times the thickness of each toothed piece.

[0010] Optionally, each boss has two boss bottom points coupled to the base, and each toothed piece has two toothed bottom points coupled to the base, wherein the distance between one of the two boss bottom points of each boss and the corresponding toothed bottom point of its adjacent corresponding toothed piece is more than twice the thickness of each toothed piece; and / or wherein the distance between one of the two toothed bottom points of each toothed piece and the corresponding toothed bottom point of its adjacent corresponding toothed piece is one to three times the thickness of each toothed piece.

[0011] Optionally, the side of each boss facing its adjacent corresponding tooth is a chamfered surface or a circular arc surface.

[0012] Optionally, the top of each boss is not sharp.

[0013] Optionally, the gasket may also include a locating ring, which is integrally formed with or separable from the metal skeleton, to assist in the positioning of the gasket. The axial thickness of the locating ring is less than the axial height of each boss.

[0014] Optionally, the width of the metal frame in the cross section along the first centerline is substantially equal to the width of the non-metallic sealing layer in the cross section along the first centerline.

[0015] Alternatively, the non-metallic sealing material includes any one or a combination of the following materials: graphite; polytetrafluoroethylene; mica; vermiculite; and ceramic fiber.

[0016] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, illustrate embodiments of this application and, together with the specification, serve to explain the principles of this application.

[0018] Figure 1 This is a perspective view of a sealing gasket according to one embodiment of this application;

[0019] Figure 2 It is along Figure 1 An axial sectional view of the sealing gasket taken from line BB;

[0020] Figure 3 This is an axial cross-sectional view of a sealing gasket installed in a device according to one embodiment of this application;

[0021] Figure 4 This is an axial cross-sectional view of a sealing gasket installed in a device according to another embodiment of this application;

[0022] Figure 5 This is an axial cross-sectional view of a sealing gasket installed in a device according to yet another embodiment of this application; and

[0023] Figure 6 yes Figure 2 An enlarged axial sectional view of a portion of a gasket, wherein section lines have been removed for clarity, and the various portions of the gasket are not necessarily drawn to scale. Detailed Implementation

[0024] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0025] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0026] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0028] Figure 1 This is a perspective view of a sealing gasket 10 according to one embodiment of the present application, wherein the sealing gasket 10 defines an axis A. Viewed from a plane perpendicular to axis A, the sealing gasket 10 is substantially circular and hollow.

[0029] Figure 2 Show along Figure 1 The section of the sealing gasket 10 including axis A is shown by line BB, that is, the axial section of the sealing gasket 10 along the axis A is shown. In general, the sealing gasket 10 includes: a metal skeleton 12, which is at least partially, for example, entirely, fishbone-shaped in the axial section; therefore, the sealing gasket 10 provided in this application can also be referred to as a fishbone-type sealing gasket 10; and a non-metallic sealing layer 14, which covers the two axial end faces 12a, 12b of the metal skeleton 12, the two axial end faces 12a, 12b being arranged opposite to each other in the axial direction.

[0030] Figures 3 to 5The diagram shows an axial section of a gasket 10 according to various embodiments of this application installed in a device. The gasket 10 provided in this application is suitable for devices in which fluid media are transported. When the gasket 10 is installed in such a device, it effectively seals the device to prevent fluid media leakage. Such devices include, but are not limited to, pipeline systems used in industries such as petroleum, chemical, power, and metallurgy, which sometimes need to operate in harsh environments such as high temperature and high pressure to transport fluid media. For example, a pipeline system includes a first flange 16 located at one end of a pipe and a second flange 18 located at one end of another pipe. The gasket 10 is positioned between the end faces of the first flange 16 and the second flange 18 such that the axis A of the gasket 10 coincides with the axis of the first pipe (not shown) and the axis of the other pipe (not shown). Then, the first flange 16 and the second flange 18 can be fastened together by means of a plurality of bolts 20, thereby achieving a seal between the end faces of the first flange 16 and the second flange 18. Figure 3 In this configuration, the first flange 16 is a concave flange and the second flange 18 is a convex flange. The gasket 10 can be inserted into the concave flange for positioning. Figure 4 and Figure 5 In this design, both the first flange 16 and the second flange 18 are flat flanges. Therefore, a positioning ring 22 is also provided for the gasket 10 to assist in positioning the gasket 10 if necessary.

[0031] Additionally, the sealing gasket 10 defines a radial line C orthogonal to axis A, such as... Figure 4 As shown, the positioning ring 22 can be integrally formed with the metal frame 12 and extends from the radially outer end of the metal frame 12 along the radial line C. Alternatively, as... Figure 5 As shown, the positioning ring 22 may be separable from the metal frame 12 and may be mounted to the radial outer end of the metal frame 12 in a suitable manner. For example, the positioning ring 22 may include at least two axially divisible parts and the at least two parts may be respectively mounted to the radial outer end of the metal frame 12.

[0032] Return to Figure 2Specifically, the metal frame 12 includes a base 24, which is straight in axial section and has a first centerline D orthogonal to axis A, that is, the first centerline D coincides with the radial line C. In the presence of a locating ring 22, the locating ring 22 can extend from the radially outer end of the base 24 or be fitted to the radially outer end of the base 24 in a suitable manner. The base 24 defines an axial channel through which the fluid medium transported in the device can flow when the gasket 10 is installed in the device, so that the gasket 10 is subjected to medium pressure. For example, when the pressure of the fluid medium transported in the device is greater than the ambient pressure outside the device, the direction of the medium pressure (positive pressure) is (e.g.) Figure 3 Arrow H indicates a generally radially outward direction, while when the pressure of the fluid medium being transported in the device is less than the ambient pressure outside the device, the direction of the medium pressure (negative pressure) is generally radially inward. For piping systems, the diameter of the axial passage will be equal to or greater than the inner diameter of one pipe and the inner diameter of the other pipe.

[0033] In the following text, the configuration of the various parts of the sealing gasket 10 is defined for the unused, i.e., unstressed state. Unless otherwise stated.

[0034] Continue to refer to Figure 2 The metal skeleton 12 also includes two sets of annular toothed plates 26. The two sets of toothed plates 26 extend from the two axial end faces 24a and 24b of the base 24, respectively. The two axial end faces 24a and 24b are arranged opposite to each other in the axial direction. The two sets of toothed plates 26 are symmetrically arranged with respect to the first center line D in the axial section, and each set of toothed plates 26 is spaced along the first center line D.

[0035] Especially Figure 6As shown, each of the two sets of toothed segments 26 includes an inclined segment 26a and a curved segment 26b adjacent to the inclined segment 26a. The inclined segment 26a is straight in axial section and has a second centerline E. The second centerline E is inclined at an angle β in the range of 15°-50° to the axis A, or rather, to a virtual straight line parallel to the axis A and intersecting the second centerline E, against the direction of the medium pressure. That is, when the direction of the medium pressure is basically radially outward, the second centerline E will be radially inward toward the axis A, and when the direction of the medium pressure is basically radially inward, the second centerline E will be radially outward away from the axis A. The curved segment 26b is curved toward the base 24 in cross-section and has a third centerline F, which is continuous with the second centerline E, and has at least one radius of curvature in the range of R1 mm to R4 mm (i.e., a radius of 1 mm to 4 mm), or in other words, at least one bending radius in the range of 1.2 to 1.8 rad. The at least one radius of curvature includes a plurality of radii of curvature.

[0036] The thickness of the inclined segment 26a of each toothed piece 26, measured in the axial section in the direction perpendicular to the second centerline E, is substantially constant, and the thickness of the curved segment 26b of each toothed piece 26, measured in the axial section in the direction perpendicular to the third centerline F, is also substantially constant. The thicknesses of the inclined segment 26a and the curved segment 26b can be substantially equal. In other words, the thickness L4 of each toothed piece 26 can be substantially constant.

[0037] When the gasket 10 is installed in a device, such as a piping system, the gasket 10 is first subjected to sealing pressure from the end faces of the first flange 16 and the second flange 18, such that the gasket 10 is axially compressed by a certain amount of compression. The amount of compression comes from the elastic deformation of the non-metallic sealing layer 14, and more importantly, from the elastic deformation and shape deformation of the metal skeleton 12 embedded in the non-metallic sealing layer 14, especially the toothed plate 26 itself. The shape deformation of the toothed plate 26 refers to the deflection of the toothed plate 26 toward the base 24 under the action of sealing pressure. Due to the bending characteristics of the curved segment 26b of the toothed plate 26, the side of the curved segment 26b facing away from the base 24, or the side facing the end face of the first flange 16 or the second flange 18, is an arc-shaped surface. This arc-shaped surface can provide additional elastic deformation and shape deformation for the toothed plate 26, and even when the elastic deformation of the non-metallic sealing layer 14 is extremely thin, the deflected toothed plate 26 maintains non-sharp indirect contact with the end face of the first flange 16 or the end face of the second flange 18 via the non-metallic sealing layer 14. As the fluid medium flows through the axial channel of the gasket 10, the gasket 10 is also subjected to medium pressure. Due to the inclined characteristics of the inclined segments 26a of each tooth 26, the medium pressure causes each tooth 26 to at least tend to rotate away from the base 24 to restore its original shape. The compression of the gasket 10 will thus change. In this way, the gasket 10 can promptly compensate for the gap between the end faces of the first flange 16 and the second flange 18 caused by the temperature and pressure fluctuations of the fluid medium or the device itself, thereby enhancing the sealing effect of the gasket 10.

[0038] Furthermore, it is advantageous for the second centerline E to be inclined at an angle β between 15° and 50° to the axis A, against the direction of the medium pressure. If the angle β is less than 15°, the increase in compression with increasing sealing pressure is insufficient, meaning that the toothed plate 26 lacks compressive deformation capacity. If the angle β is greater than 50°, the toothed plate 26 will be too easily deflected toward the base 24 under the action of sealing pressure, and will not easily rotate away from the base 24 to return to its original shape when the sealing pressure is removed or reduced, meaning that the toothed plate 26 lacks resilience.

[0039] It is worth noting that, in this paper, the curved segment 26b provides greater flexibility than the inclined segment 26a; that is, the curved segment 26b has a greater compressive deformation capacity than the inclined segment 26a. This allows the toothed plate 26 to provide two levels of compressive deformation under sealing pressure, thereby expanding the application range of the gasket. Moreover, even if the curved segment 26b fails due to cracking during the use of the gasket, the inclined segment 26a can still continue to provide effective support or resilience to resist sealing pressure.

[0040] The metal frame 12 also includes at least one pair of annular bosses 28 (also referred to as limiting bosses 28). The at least one pair of bosses 28 also extend from the two axial end faces 24a and 24b of the base 24 and are symmetrically arranged in the axial section with respect to the first center line D. Therefore, one of the bosses 28 is located on one axial end face 24a of the base 24. The boss 28 can be radially adjacent to and located between the two toothed pieces 26 provided on the one axial end face 24a. Alternatively, the boss 28 can also be provided at the radially outer end of the base 24 (adjacent to the positioning ring 22 and radially inward relative to the positioning ring 22 in the case of the positioning ring 22), and adjacent to and radially outward relative to the toothed piece 26 provided on the one axial end face 24a. Each of the at least one pair of bosses 28 and its adjacent corresponding toothed plate 26 are spaced apart along the first centerline D to prevent the toothed plate 26 from being crushed under overload of sealing pressure from the end face of the first flange 16 and the end face of the second flange 18, i.e., damage to the sealing gasket 10. Specifically, in order to give the toothed plate 26 good compressibility and resilience, the thickness of the toothed plate 26 is relatively small, so that the toothed plate 26 forms a thin strip, while the bosses 28 can provide sufficient strength / hardness to resist sealing pressure. It is understood that the at least one pair of bosses 28 includes multiple pairs of bosses 28.

[0041] The axial spacing L7 between the vertices of the at least one pair of bosses 28 opposite to the base 24 is 60%-90% of the axial thickness L8 of the sealing gasket 10. That is, the shape of the bosses 28 is not restricted, and a top is formed on the side opposite to the base 24; the top is not sharp, i.e., it does not have sharp corners. When the top is a curved or arc-shaped surface, the point in the top that is axially furthest from the base 24 is the vertex; when the top includes a plane axially furthest from the base 24, the number of vertices is multiple. The axial spacing L7 between the vertices of the at least one pair of bosses 28 can be understood as the sum of the axial heights of the two bosses 28 and the axial thickness of the base 24.

[0042] Optionally, the maximum width L2 of each boss 28 in the direction along the first center line D is more than 2.5 times the thickness L4 of each toothed piece 26.

[0043] Optionally, the axial height L5 of each toothed piece 26 is 35%-85% of the maximum axial thickness L6 of a portion of the non-metallic sealing layer 14 covering one of the two axial end faces 12a, 12b of the metal skeleton 12. That is, when the toothed piece 26 is located on one axial end face 24a of the substrate 24 and is embedded in the portion of the non-metallic sealing layer 14, the axial height of the toothed piece 26 is the axial distance between the vertex of the toothed piece 26 on the side of the curved segment 26b away from the substrate 24 and the one axial end face 24a of the substrate 24, and the maximum axial thickness of the non-metallic sealing layer 14 is the axial distance between the axial surface of the non-metallic sealing layer 14 and the one axial end face of the substrate 24. It is understood that no toothed plate 26 and boss 28 protrude from the two axial end faces 24a, 24b of the substrate 24 to be exposed to a portion of the non-metallic sealing layer 14 that constitutes a portion of the two axial end faces 12a, 12b of the metal skeleton 12.

[0044] Each boss 28 has two boss bottom points that are directly coupled to / connected to the base 24, and each toothed piece 26 has two toothed bottom points that are directly coupled to / connected to the base 24.

[0045] Optionally, the distance L3 between one of the two boss bottom points of each boss 28 and the corresponding tooth bottom point of its adjacent corresponding tooth 26 is more than twice the thickness L4 of each tooth 26. This is advantageous, because if the distance L3 is less than twice the thickness L4 of each tooth 26, it will limit the spatial range of elastic deformation and shape deformation of the tooth 26 itself, affecting the compressive deformation capacity and resilience of the sealing gasket 10.

[0046] Optionally, the distance L1 between one of the two tooth base points of each toothed piece 26 and the corresponding tooth base point of its adjacent toothed piece 26 is 1 to 3 times the thickness L4 of each toothed piece 26. This is advantageous because if the distance L1 is less than 1 times the thickness L4 of each toothed piece 26, adjacent toothed pieces 26 are easy to fit together and are not difficult to process; while if the distance L1 is greater than 3 times the thickness L4 of each toothed piece 26, the number of toothed pieces 26 may be too small, so that the toothed pieces 26 are ineffective.

[0047] Optionally, to help the toothed plate 26 exert its compressive deformation and springback capabilities and avoid stress concentration causing yielding, the inclined segment 26a of the toothed plate 26 is joined / connected to the base 24 via a first transition segment. The side of the first transition segment that is continuous with the radially outward side of the inclined segment 26a is rounded, and the side of the first transition segment that is continuous with the radially inward side of the inclined segment 26a is also rounded. Similarly, the boss 28 is joined / connected to the base 24 via a second transition segment. The side of the second transition segment that is continuous with the radially outward side of the boss 28 is rounded, and the side of the second transition segment that is continuous with the radially inward side of the boss 28 is also rounded. It is worth noting that the first and second transition segments may or may not be considered regarding the two boss bottom points of each boss 28 and the two tooth bottom points of each toothed plate 26.

[0048] Optionally, the curved segment 26b of the boss 28 is also rounded at its free end to have an arc-shaped end surface.

[0049] Optionally, the axial thickness of the locating ring 22 is less than the axial height of each boss 28, and the axial thickness of the locating ring 22 is less than 50% of the axial thickness L8 of the sealing gasket 10.

[0050] Optionally, the radial width of the metal frame 12 is substantially equal to the radial width of the non-metallic sealing layer 14. That is, the width of the metal frame 12 in cross-section along the first centerline D is substantially equal to the width of the non-metallic sealing layer 14 in cross-section along the first centerline D. In the presence of the positioning ring 22, the non-metallic sealing layer 14 may at least partially cover the two axial end faces of the positioning ring 22, or it may not cover the two axial end faces of the positioning ring 22.

[0051] Optionally, the side of each boss 28 facing its adjacent corresponding tooth 26 is a bevel or an arc surface. This side, in particular, is the side of the face facing the corresponding tooth 26 that is inclined towards the substrate 24. This ensures that the boss 28 has no sharp corners affecting or interfering with the corresponding tooth 26, which is beneficial for providing space for the compression deformation and springback of the tooth 26, and facilitates the embedding and bonding of the non-metallic sealing layer. For example, each boss 28 may be semi-elliptical, such that at least one side of each boss 28 has an arc or curved surface. For a boss 28 forming the maximum width L2 at the two bottom points of the two bosses, an arc or curved surface provides greater strength / hardness than a bevel.

[0052] Alternatively, the non-metallic sealing material includes any one or a combination of the following materials: graphite; polytetrafluoroethylene; mica; vermiculite; and ceramic fiber.

[0053] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A gasket (10) suitable for a device in which a fluid medium is transported, the gasket (10) defining an axis and comprising: The metal skeleton (12), which is at least partially shaped like a fish spine in the cross section including the axis of the sealing gasket (10), and A non-metallic sealing layer (14) is applied to the two axial end faces (12a, 12b) of the metal frame (12). The metal skeleton (12) is characterized by comprising: The substrate (24) is straight in cross-section and has a first centerline (D) orthogonal to the axis, and the substrate (24) defines an axial channel through which the fluid medium transmitted in the device can flow when the gasket (10) is installed in the device, so that the gasket (10) is subjected to medium pressure; and Two sets of annular toothed plates (26) extend from two axial end faces (24a, 24b) of the base (24) and are symmetrically arranged in cross-section relative to a first centerline (D). Each set of toothed plates (26) is spaced apart along the first centerline (D). Each toothed plate (26) includes an inclined segment (26a) and a curved segment (26b) adjacent to the inclined segment (26a). The inclined segment (26a) is straight in cross-section and has a second centerline (E). The second centerline (E) is inclined at an angle (β) of 15°-50° to the axis against the direction of the medium pressure. The curved segment (26b) is curved in cross-section toward the base (24) and has a third centerline (F). The third centerline (F) has at least one radius of curvature in the range of 1 mm-4 mm. At least one pair of annular bosses (28) are provided, which also extend from the two axial end faces (24a, 24b) of the base (24) and are symmetrically arranged in cross section relative to the first center line (D). Each of the at least one pair of bosses (28) and its adjacent corresponding toothed piece (26) are spaced apart along the first center line (D). The axial spacing (L7) between the vertices of the at least one pair of bosses (28) away from the base (24) is 60%-90% of the axial thickness (L8) of the sealing gasket (10).

2. The sealing gasket (10) according to claim 1, characterized in that, The axial height (L5) of each toothed piece (26) is 35% - 85% of the maximum axial thickness (L6) of a portion of the non-metallic sealing layer (14) covering one of the two axial end faces of the metal skeleton (12).

3. The sealing gasket (10) according to claim 1 or 2, characterized in that, The thickness (L4) of each toothed piece (26) is constant.

4. The sealing gasket (10) according to claim 3, characterized in that, The maximum width (L2) of each boss (28) in the cross section along the first center line (D) is more than 2.5 times the thickness (L4) of each tooth (26).

5. The sealing gasket (10) according to claim 3, characterized in that, Each boss (28) has two boss bottom points that engage with the base (24), and each toothed piece (26) has two toothed bottom points that engage with the base (24). Wherein, the distance (L3) between one of the two boss bottom points of each boss (28) and the corresponding tooth bottom point of its adjacent corresponding tooth (26) is more than twice the thickness (L4) of each tooth (26); and / or The distance (L1) between one of the two tooth base points of each tooth (26) and the corresponding tooth base point of the adjacent tooth (26) is 1 to 3 times the thickness (L4) of each tooth (26).

6. The sealing gasket (10) according to claim 1 or 2, characterized in that, The face of each boss (28) is an inclined or arc-shaped face of its adjacent corresponding tooth (26).

7. The sealing gasket (10) according to claim 1 or 2, characterized in that, The top of each boss (28) is not sharp relative to the base (24).

8. The sealing gasket (10) according to claim 1 or 2, characterized in that, It also includes a positioning ring (22), which is integrally formed with the metal skeleton (12) or is separable, to assist in the positioning of the sealing gasket (10). The axial thickness of the positioning ring (22) is less than the axial height of each boss (28).

9. The sealing gasket (10) according to claim 1 or 2, characterized in that, The width of the metal frame (12) in the cross section along the first center line (D) is equal to the width of the non-metallic sealing layer (14) in the cross section along the first center line (D).

10. The sealing gasket (10) according to claim 1 or 2, characterized in that, Non-metallic sealing materials include any one or a combination of the following materials: graphite; polytetrafluoroethylene; mica; vermiculite; and ceramic fiber.

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