Sealing gasket and engine

Abstract

The sealing gasket is used for being fixed between two opposite flanges, the sealing gasket comprises a sealing gasket body and outer layer plates arranged on the two opposite sides of the sealing gasket body, the sealing gasket body comprises a base plate, the base plate is provided with a through hole, and the base plate is fixedly connected with the outer layer plates; the sealing ring is clamped between the two outer-layer plates, the sealing ring is located in the through hole, a gap is formed between the sealing ring and the hole wall of the through hole, the sealing ring is provided with a first air channel hole, and the area, corresponding to the first air channel hole, of the outer-layer plate is provided with a second air channel hole; when the sealing gasket is fixed to the two opposite flanges, only the base plate is fixedly connected with the flanges, and therefore even if the flanges are heated to generate large thermal deformation, the sealing ring cannot be pulled to generate deformation, the sealing performance of the sealing ring cannot be affected, and the sealing gasket can be applied to a high-temperature exhaust system.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a sealing gasket and an engine having the sealing gasket. Background Technology

[0002] In the exhaust system of an engine, the connection between two adjacent components is usually made by flanges, and a gasket is placed between the two opposing flanges to seal the gap between them, ensuring the airtightness and reliability of the connection between the components.

[0003] The existing gasket has a through-hole for gas flow and a bolt hole. An elastic bellows ring is arranged around the gas flow hole to achieve a seal. After the gasket is fixed between the two flanges by bolts passing through both the gasket and the bolt hole on the flange, the elastic bellows ring adheres tightly to the surface of the two flanges under the action of the axial force of the bolts, relying on the compression and rebound energy of the metal itself, thereby achieving the purpose of sealing the gas.

[0004] In existing gaskets, the fixing part used to secure the flange and the sealing part used to achieve the seal are integrated into a single structure, which is simple. However, with the development of engine technology, the exhaust temperature of engines is getting higher and higher, from more than 700°C to even over 1000°C. The harsh high temperature exhaust causes the flange in the exhaust system to undergo significant thermal deformation, and the gasket connected to the flange is also stretched and deformed. At this time, the elastic bellows ring will also deform, and the elastic bellows cannot completely fit the flange surface, resulting in seal failure. This leads to a series of problems such as exhaust gas leakage, abnormal back pressure, increased noise, and component damage, which seriously affect engine performance, vehicle operation, and environmental protection. Utility Model Content

[0005] The purpose of this invention is to provide a sealing gasket and an engine having the sealing gasket.

[0006] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: a sealing gasket for fixing between two opposing flanges, the sealing gasket comprising a sealing gasket body and outer layer plates disposed on opposite sides of the sealing gasket body, the sealing gasket body comprising:

[0007] A substrate having a through hole, the substrate being fixedly connected to the outer layer plate;

[0008] A sealing ring is sandwiched between the two outer plates. The sealing ring is located inside the perforation and there is a gap between the sealing ring and the wall of the perforation. The sealing ring has a first air passage hole, and the outer plate has a second air passage hole in the area corresponding to the first air passage hole.

[0009] In one embodiment of this utility model, the gap between the sealing ring and the wall of the perforation is not less than 0.4 mm.

[0010] In one embodiment of the present invention, the sealing gasket further includes a limiting structure for restricting the rotation of the seal around the central axis of the sealing ring.

[0011] In one embodiment of this utility model, the limiting structure is disposed between the sealing ring and the substrate; and / or, the limiting structure is disposed between the sealing ring and the outer layer plate.

[0012] As one embodiment of this utility model, the limiting structure includes a protrusion and a recess that cooperate with each other.

[0013] In one embodiment of this utility model, the sealing ring is a single-layer sealing plate, and there is a deformation space between the sealing plate and the outer plate, and the thickness difference between the substrate and the sealing plate does not exceed 0.3 mm; or, the sealing ring includes a plurality of sealing plates stacked along the axial direction of the sealing ring, and there is a deformation space between two adjacent sealing plates or between the sealing plate and the outer plate, and the thickness difference between the thickness of the substrate and the total thickness of the plurality of sealing plates does not exceed 0.3 mm.

[0014] In one embodiment of this utility model, the sealing ring includes a plurality of sealing plates stacked along the axial direction of the sealing ring; a foolproof structure is provided between adjacent sealing plates.

[0015] In one embodiment of the present invention, the sealing ring includes a plurality of sealing plates stacked along the axial direction of the sealing ring, wherein the plurality of sealing plates satisfy the following conditions: adjacent sealing plates are symmetrical to each other; and / or adjacent sealing plates are stacked in the same direction; and / or one of the adjacent sealing plates is a flat plate or a corrugated plate that is corrugated in the radial direction.

[0016] In one embodiment of this utility model, the sealing ring includes at least one sealing plate, the sealing plate comprising:

[0017] A plurality of flat plate portions, wherein the plurality of flat plate portions are arranged radially and two radially adjacent flat plate portions are offset axially;

[0018] The connecting portion connects two radially adjacent flat plate portions;

[0019] The plate portion forms a deformation space with the adjacent sealing plate or outer plate, and at least one of the plate portions has a support structure protruding from one side toward the deformation space.

[0020] In one embodiment of this utility model, at least two adjacent sealing plates are bonded together at the outer ring of the sealing ring to form a bonding portion; the bonding portion and the substrate have a highly overlapping area in the axial direction.

[0021] To achieve the above objectives, the present invention also provides an engine, the engine including the aforementioned sealing gasket.

[0022] The beneficial effects of this utility model are as follows: The sealing gasket in this utility model, by separating the sealing ring and the base plate and setting a gap between the sealing ring and the base plate, when the sealing gasket is fixed on two opposing flanges, the base plate in the main body of the sealing gasket is fixedly connected to the flange, while the sealing ring is not fixedly connected to the flange. Therefore, even if the flange is heated and undergoes large thermal deformation that pulls the base plate to deform, it will not pull the sealing ring to deform, thus not affecting the sealing performance of the sealing ring, enabling the sealing gasket to be used in high-temperature exhaust systems. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the sealing gasket in the first embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A schematic diagram of the structure of the sealing gasket body in the diagram;

[0025] Figure 3 yes Figure 1 Exploded view of the sealing gasket in the middle;

[0026] Figure 4 yes Figure 1 A structural diagram of the sealing gasket from another angle;

[0027] Figure 5 yes Figure 4 The cross-sectional view at point AA (assuming that point AA has a countersunk hole and a first fixing hole mating structure);

[0028] Figure 6 yes Figure 4 The cross-sectional view at point AA (excluding the mating structure between the countersunk hole and the first fixing hole);

[0029] Figures 7-12 This is a cross-sectional view at point AA corresponding to other embodiments of the sealing ring including multiple sealing plates in this utility model;

[0030] Figure 13 The figure shown is a cross-sectional view at point AA corresponding to an embodiment in which the sealing ring of this utility model consists of only a single-layer sealing plate;

[0031] Figure 14The figure shown is a cross-sectional view at point AA corresponding to another embodiment of the sealing plate of this utility model;

[0032] Figure 15 This is a cross-sectional view of the sealing gasket at point AA in the second embodiment of this utility model. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. Please refer to the accompanying drawings for further details. Figures 1 to 15 The figures shown represent preferred embodiments of the present invention. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent modifications or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0034] Please refer to Figures 1 to 15 As shown, this utility model provides a sealing gasket 10 and an engine having the sealing gasket 10. It is understood that the sealing gasket 10 is not limited to use in engines, but can also be applied to other devices requiring a sealing connection.

[0035] In one specific embodiment, the sealing gasket 10 is applied to the exhaust system of an engine. The connection between two adjacent components in the exhaust system is typically achieved using flanges. The sealing gasket 10 is fixed between two opposing flanges, i.e., the sealing gasket 10 is fixed to two opposing flanges to achieve a sealed connection between adjacent components in the exhaust system, ensuring the airtightness and reliability of the connection points. For example, the sealing gasket 10 can be placed between the exhaust manifold and the cylinder head, between the exhaust manifold and the exhaust pipe, between the exhaust pipe and the catalytic converter, between the catalytic converter and the muffler, and between the muffler and the tailpipe, etc., in the exhaust system.

[0036] The sealing gasket 10 includes a sealing gasket body 1 and outer layer plates 2 disposed on opposite sides of the sealing gasket body 1. That is, the sealing gasket body 1 is sandwiched between the two outer layer plates 2. When the sealing gasket 10 is fixed between two opposite flanges, the two outer layer plates 2 are respectively in contact with the mating surfaces of the two flanges.

[0037] The sealing gasket body 1 includes a base plate 11 and a sealing ring 12 separately disposed from the base plate 11. The sealing ring 12 has a first air passage hole 121, that is, the inner ring of the sealing ring 12 forms the first air passage hole 121. The outer layer plate 2 has a second air passage hole 21 in the area corresponding to the first air passage hole 121, and the first air passage hole 121 and the second air passage hole 21 together form a communicating air passage. After the sealing gasket 10 is fixed between two opposing flanges in two adjacent components, the communicating air passage connects the air passages in the two adjacent components, and the sealing gasket 10 / sealing ring 12 seals the gap between the two flanges.

[0038] The substrate 11 has a through hole 111, and the sealing ring 12 is located inside the through hole 111, with a gap d1 between the sealing ring 12 and the hole wall of the through hole 111. The substrate 11 is fixedly connected to the outer layer plate 2, and the sealing ring 12 is clamped between the two outer layer plates 2. That is, after the substrate 11 and the outer layer plate 2 are fixedly connected, under the action of the axial elastic deformation of the sealing ring 12, the two ends of the sealing ring 12 in the axial direction respectively abut against the inner sides of the two outer layer plates 2, sealing the gap between the two outer layer plates 2. Thus, after the sealing gasket 10 is fixed between the two opposing flanges of the two adjacent components, the sealing gasket 10 seals the gap between the two flanges.

[0039] It should be noted that the aforementioned gap d1 refers to the gap between the sealing ring 12 and the hole wall of the perforation 111 in the horizontal direction of the substrate 11.

[0040] By providing two outer layer plates 2 that are fixedly connected to the substrate 11, the sealing ring 12 can be positioned axially, restricting the axial movement of the sealing ring 12 and improving the stability of the sealing gasket 10. Simultaneously, only the substrate 11 is fixedly connected to the outer layer plates 2, while the sealing ring 12 has no direct fixed connection to either the substrate 11 or the outer layer plates 2. Furthermore, there is a gap d1 between the sealing ring 12 and the wall of the through hole 111 on the substrate 11, making the sealing ring 12 and the substrate 11 separate and spaced apart, preventing interference between them. When the sealing gasket 10 is fixed to two opposing flanges, the connection between the sealing gasket 10 and the flange corresponds only to the base plate 11. That is, the base plate 11 in the sealing gasket body 1 is fixedly connected to the flange, while the sealing ring 12 is not fixedly connected to the flange. The sealing ring 12 and the base plate 11 are separate and spaced apart. Therefore, even if the flange is heated and undergoes large thermal deformation that pulls the base plate 11 to deform, the sealing ring 12 will not be pulled to deform, thus not affecting the sealing performance of the sealing ring 12. This allows the sealing gasket 10 to be used in high-temperature exhaust systems.

[0041] In one specific embodiment, the perforation 111 is located in the middle of the substrate 11. Of course, this is not a limitation.

[0042] In some optional embodiments, the gap d1 between the sealing ring 12 and the hole wall of the perforation 111 is not less than 0.4 mm. That is, the gap d1 between the outer ring of the sealing ring 12 and the hole wall of the perforation 111 in the plane of the substrate 11 is not less than 0.4 mm, which can provide sufficient deformation space for the substrate 11 and avoid the thermal deformation of the substrate 11 from causing the sealing ring 12 to deform and affecting the sealing effect of the sealing ring 12.

[0043] The substrate 11 and the two outer plates 2 can be fixedly connected by welding or by riveting.

[0044] Combination Figure 5 As shown in one specific embodiment, the substrate 11 has a first fixing hole 112 extending through it. The outer layer 2 has a countersunk hole 22 facing the first fixing hole 112 at a position corresponding to the first fixing hole 112. The substrate 11 and the two outer layer 2 can be fixedly connected by welding the countersunk holes 22 on the two outer layer 2 that mate with the same first fixing hole 112. Alternatively, the substrate 11 and the two outer layer 2 can be fixedly connected by riveting the countersunk holes 22 on the two outer layer 2 that mate with the same first fixing hole 112. Of course, it is understood that the connection structure between the substrate 11 and the outer layer 2 is not limited to the welding or riveting methods described above.

[0045] First, the outer layer plate 2 is fixedly connected to the base plate 11 by welding or riveting, so that the sealing gasket 10 forms a single, non-dispersible unit, which facilitates the subsequent fixing of the sealing gasket 10 to the two opposing flanges. It is understood that after the sealing gasket 10 is fixed to the two opposing flanges, the outer layer plate 2 and the base plate 11 are almost in contact.

[0046] In one specific implementation method, combined with Figure 3 As shown, the substrate 11 further includes a second fixing hole 113 distributed around the through hole 111, and the outer layer plate 2 has a third fixing hole 23 corresponding to the second fixing hole 113. The sealing gasket 10 is fixed to the two opposing flanges by bolts passing through the second fixing hole 113, the third fixing hole 23, and the corresponding holes on the flange.

[0047] It is known that the first fixing hole 112 and the second fixing hole 113 can be set at different positions on the substrate 11. Correspondingly, the countersunk hole 22 and the third fixing hole 23 are also located at different positions on the outer layer plate 2.

[0048] Specifically, the sealing ring 12 can be formed from a single-layer sealing plate 122. In this case, the sealing plate 122 is defined as a bent ring used for sealing, such as... Figure 13 As shown, this invention's sealing ring 12 consists of only a single-layer sealing plate 122. In this case, the sealing plate 122 can deform along the axial direction, forming a deformation space between the sealing plate 122 and the outer plate 2.

[0049] The sealing ring 12 can also be composed of multiple sealing plates 122 stacked along the axial direction of the sealing ring 12. In this case, the multiple sealing plates 122 include bent rings and other plates, such as flat plates or corrugated plates that are radially corrugated. That is, the number and shape of the sealing plates 122 forming the sealing ring 12 can be designed according to the specific application scenario.

[0050] In an embodiment where the sealing ring 12 is composed of a plurality of sealing plates 122 stacked axially, the plurality of sealing plates 122 satisfy the following conditions: adjacent sealing plates 122 / bending rings are symmetrical to each other; and / or, adjacent sealing plates 122 / bending rings are stacked in the same direction; and / or, one of the adjacent sealing plates 122 is a flat plate or a corrugated plate that is radially corrugated, and the other is a bending ring. That is, the stacking method between any two adjacent sealing plates 122 can be selected according to specific requirements.

[0051] Combination Figures 1-6 The image shows a sealing gasket 10 in the first embodiment of this application, which is an embodiment in which the sealing ring 12 is composed of multiple sealing plates 122 stacked axially. The sealing ring 12 includes two layers of sealing plates 122 stacked axially along the sealing ring 12. Each sealing plate 122 is an annular plate, i.e., two axially stacked bent rings. The two sealing plates 122 are symmetrical to each other, and a deformation portion is formed between the two sealing plates 122. Specifically, each sealing plate 122 includes an interconnected fitting portion 1221 and a deformation portion 1222 forming a deformation space between the two sealing plates 122. In this embodiment, the fitting portion 1221 is located at the outer ring of the sealing ring 12, i.e., the outer ring of the sealing ring 12 is a ring of the fitting portion 1221. The aforementioned gap d1 between the sealing ring 12 and the wall of the perforation 111 refers to the gap d1 between the fitting portion 1221 of the outer ring of the sealing ring 12 and the wall of the perforation 111.

[0052] Of course, this is not the only limitation. In other embodiments where the sealing ring 12 is composed of a plurality of sealing plates 122 stacked axially, such as... Figure 7 As shown, when the sealing ring 12 also includes two layers of sealing plates 122, the two layers of sealing plates 122 can be stacked in the same direction. In this case, a deformation space is formed between the sealing plate 122 and the outer plate 2; or, as shown... Figure 8 As shown, when the sealing ring 12 also includes two layers of sealing plates 122, i.e., two layers of bent rings, the outer ring of the sealing ring 12 can also be set as a single deformable portion 1222; or, as... Figures 9-12 As shown, the sealing ring 12 may further include three or more sealing plates 122 stacked along the axial direction of the sealing ring 12. There is a deformation space between adjacent sealing plates 122 or between a sealing plate 122 and the outer plate 2. In this case, the shape of each sealing plate 122 can be set to be the same, all being bent rings, such as... Figures 9-10 As shown, in some specific embodiments, adjacent sealing plates 122 are symmetrical to each other; or they can also be as follows: Figure 11 As shown, some adjacent layers of sealing plates 122 / bending rings are symmetrically arranged, while other adjacent layers of sealing plates 122 / bending rings are stacked in the same direction. Alternatively, sealing plates 122 of different shapes can be used, such as one or more flat or corrugated plates between adjacent layers of bending rings. Figure 12 As shown, in one specific embodiment, the sealing plate 122 may include at least two bent rings 122a and at least one flat plate 122b disposed between two adjacent bent rings 122a. The flat plate 122b has a different shape from the bent rings 122a, while the two bent rings 122a have the same shape. In this embodiment, the two bent rings 122a located on opposite sides of the flat plate 122b are symmetrical to each other. However, in other embodiments, the two bent rings 122a located on opposite sides of the flat plate 122b may also be arranged in the same direction. It is understood that the number of layers, shape, structure, etc. of the sealing plate 122 in the sealing ring 12 can be designed according to specific requirements, and will not be listed exhaustively here.

[0053] Furthermore, in a preferred embodiment where at least two adjacent sealing plates 1221 are bonded together at the outer ring of the sealing ring 2 to form a bonding portion 1221, the bonding portion 1221 and the substrate 11 have a highly overlapping area in the axial direction of the sealing ring 12. This is more conducive to limiting the sealing ring 12 in the plane direction of the substrate 11, avoiding excessive misalignment between the first air passage hole 121 of the sealing ring 12 and the second air passage hole 21 on the outer plate 2, and improving the stability of the sealing performance of the sealing gasket 10.

[0054] In some optional embodiments, the thickness difference between the thickness d2 of the substrate 11 and the total thickness d3 of the sealing plate 122 forming the sealing ring 12 can be freely adjusted. Specifically, in embodiments where the sealing ring 12 is a single-layer sealing plate 122, this means that the thickness difference between the thickness d2 of the substrate 11 and the thickness d3 of the single-layer sealing plate 122 can be freely adjusted; in embodiments where the sealing ring 12 includes multiple sealing plates 122 stacked along the axial direction of the sealing ring 12, this means that the thickness difference between the thickness d2 of the substrate 11 and the sum (total thickness) d3 of the thicknesses of the multiple sealing plates 122 can be freely adjusted. Figure 6 As shown, in the first embodiment of this utility model, the thickness d2 of the substrate 11 is greater than the total thickness d3 of the two sealing plates 122. Therefore, by thickening the substrate 11, the axial elastic deformation of the sealing ring 12 can be limited, preventing excessive axial deformation and failure of the sealing ring 12, thereby improving the stability of the sealing performance of the sealing gasket 10. Of course, this is not a limitation; in other embodiments, the thickness d2 of the substrate 11 can also be set to be less than the total thickness d3 of the sealing plates 122 forming the sealing ring 12.

[0055] In some optional embodiments, the thickness difference between the thickness d2 of the substrate 11 and the total thickness d3 of the sealing plate 122 forming the sealing ring 12 does not exceed 0.3 mm.

[0056] The sealing plate 122 is defined as including a plurality of flat plate portions arranged radially and spaced apart, and a connecting portion 1224 connecting two radially adjacent flat plate portions. The two radially adjacent flat plate portions are offset axially, and a deformation space is formed between the flat plate portions and the adjacent sealing plate 122 or the outer plate 2.

[0057] In the first embodiment of this application, as Figure 6 As shown, the sealing plate 122 includes two flat plate portions and a connecting portion 1224 connecting the two adjacent flat plate portions. Specifically, the sealing plate 122 includes a first flat plate portion 1223a, a second flat plate portion 1223b, and a connecting portion 1224 connecting the first flat plate portion 1223a and the second flat plate portion 1223b. The connected first flat plate portion 1223a corresponds to the aforementioned fitting portion 1221. The connecting portion 1224 and the second flat plate portion 1223b together form the aforementioned deformable portion 1222. A deformable space is formed between the first flat plate portion 1223a and the outer layer plate 2, and a deformable space is formed between the second flat plate portion 1223b and the second flat plate portion 1223b of another sealing plate 122. In this case, the sealing plate 122 can be referred to as a semi-reinforced bending ring. However, this is not a limitation; for example... Figure 14As shown, in another embodiment of the sealing plate 122, the sealing plate 122 includes three flat plate portions and a connecting portion 1224 connecting two adjacent flat plate portions. That is, the sealing plate 122 includes a first flat plate portion 1223a, a second flat plate portion 1223b, a third flat plate portion 1223c, and a connecting portion 1224 connecting the first flat plate portion 1223a and the second flat plate portion 1223b, and the second flat plate portion 1223b and the third flat plate portion 1223c. The flat plate portion 1223a and the third flat plate portion 1223c form the aforementioned fitting portion 1221, and the connecting portion 1224 and the second flat plate portion 1223b together form the aforementioned deformable portion 1222. A deformable space is formed between the first flat plate portion 1223a and the third flat plate portion 1223c and the outer layer plate 2, and a deformable space is formed between the second flat plate portion 1223b and the second flat plate portion 1223b of another sealing plate 122. At this time, the sealing plate 122 can be referred to as a fully reinforced bending ring.

[0058] In some optional embodiments, at least one of the flat plate portions has a support structure 3 protruding from the side facing the deformation space. By adding the support structure 3, the axial elastic deformation of the sealing ring 12 can be limited, preventing the sealing ring 12 from failing due to excessive axial deformation, thereby improving the stability of the sealing performance of the sealing gasket 10. For example, in combination with Figure 15 As shown, the sealing gasket 10 in the second embodiment of this application is different from the first embodiment in that the support structure 3 is provided on the second flat plate portion 1223b of at least one sealing plate 122. In this case, the thickness d2 of the substrate 11 can be set to be equal to the sum of the thicknesses d3 of the sealing plates 122 that form the sealing ring 12. This can also achieve the purpose of limiting the axial elastic deformation of the sealing ring 12 and avoiding the sealing ring 12 from failing due to excessive axial deformation.

[0059] Specifically, the support structure 3 can be an integral support protrusion or a number of spaced small support protrusions, such as support beads. The material of the support structure 3 can be the same as that of the sealing plate 122, which is a high-temperature resistant material. The support structure 3 can be formed by welding or stamping the flat plate portion.

[0060] The sealing gasket 10 in the second embodiment of this application is the same as that in the first embodiment except for the differences mentioned above, and will not be described again here.

[0061] In some optional embodiments, the sealing gasket 10 further includes a limiting structure 4 for restricting the rotation of the sealing ring 12 about its central axis. Restricting the rotation of the sealing ring 12 about its central axis, i.e., restricting the rotation of the sealing ring 12 relative to the substrate 11, is particularly beneficial for sealing gaskets 10 with irregularly shaped perforations, thereby improving the sealing stability of the sealing gasket 10. Of course, it is understood that for sealing gaskets 10 with circular perforations, the limiting structure 4 may not be provided. In this case, the sealing ring 12 can rotate relative to the substrate 11 about its central axis, as long as it does not affect the sealing performance of the sealing ring 12.

[0062] Combination Figures 2-3 As shown, in the first embodiment of this application, the limiting structure 4 is disposed between the sealing ring 12 and the substrate 11. That is, the fitting portion 1221 is provided on the outer ring of the deformable portion 1222 near the hole wall of the through hole 111, and the fitting portion 1221 and the substrate 11 are located on the same plane. In embodiments where the limiting structure 4 can be disposed between the sealing ring 12 and the substrate 11, specifically between the fitting portion 1221 and the hole wall of the through hole 111. Of course, this is not a limitation; in other embodiments, the limiting structure 4 can also be disposed between the sealing ring 12 and the outer layer plate 2.

[0063] It is understood that in embodiments where the limiting structure 4 is disposed between the sealing ring 12 and the outer plate 2, or where the sealing gasket 10 does not include the limiting structure 4, the outer ring of the sealing ring 12 and the hole wall of the perforation 111 can both be set to be circular, wherein the outer ring diameter of the sealing ring 12 is smaller than the hole diameter of the perforation 111.

[0064] In any optional embodiment, the limiting structure 4 includes a protrusion 41 and a recess 42 that cooperate with each other. The interlocking structure between the protrusion 41 and the recess 42 enables the rotational limiting function of the sealing ring 12.

[0065] Combination Figure 3 As shown, in the first embodiment of this application, the limiting structure 4 includes a plurality of protrusions 41 disposed on the outer periphery of the sealing ring 12 and recesses 42 disposed on the wall of the through hole 111 and corresponding to the protrusions 41 one by one. After the sealing ring 12 is installed in the through hole 111, the protrusions 41 are limited to the corresponding recesses 42, thereby limiting the sealing ring 12 circumferentially, restricting the rotation of the sealing ring 12 relative to the substrate 11, and improving the sealing stability of the sealing gasket 10.

[0066] In some optional embodiments, the sealing ring 12 includes a plurality of sealing plates 122 stacked along the axial direction of the sealing ring 12, and a foolproof structure is provided between adjacent sealing plates 122. This facilitates the assembly personnel in quickly fixing adjacent sealing plates 122 together. In particular, for embodiments where the outer periphery of the sealing ring 12 has several protrusions 41 and recesses 42, it allows the assembly personnel to quickly align the corresponding protrusions 41 / recesses 42 of different sealing plates 122, enabling them to quickly fix adjacent sealing plates 122 together and avoiding assembly errors.

[0067] Combination Figure 3 As shown, in one specific embodiment, the foolproof structure is provided with alignment holes 5 on corresponding protrusions 41 of the two sealing plates 122. During assembly, the two protrusions 41 with alignment holes 5 are simply aligned by fitting them together. Of course, this is not a limitation.

[0068] Compared with the prior art, the sealing gasket 10 of this utility model separates the sealing ring 12 from the base plate 11 and sets a gap d1 between the sealing ring 12 and the base plate 11. When the sealing gasket 10 is fixed to two opposing flanges, the base plate 11 in the sealing gasket body 1 is fixedly connected to the flange, while the sealing ring 12 is not fixedly connected to the flange. Therefore, even if the flange is heated and undergoes large thermal deformation that pulls the base plate 11 to deform, it will not pull the sealing ring 12 to deform, thus not affecting the sealing performance of the sealing ring 12. This allows the sealing gasket 10 to be used in high-temperature exhaust systems.

[0069] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for 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 embodiments that can be understood by those skilled in the art.

[0070] The detailed descriptions listed above are merely specific descriptions of feasible implementations of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A gasket for securing between two opposing flanges, characterized in that, The sealing gasket comprises a sealing gasket body, outer layer plates arranged on opposite sides of the sealing gasket body, and the sealing gasket body comprises: a base plate having a through hole, the base plate being fixedly connected with the outer layer plates; a sealing ring clamped between the two outer layer plates, the sealing ring being located in the through hole and having a gap between the sealing ring and the hole wall of the through hole, the sealing ring having a first air passage hole, and the outer layer plates being provided with second air passage holes corresponding to the first air passage hole.

2. The gasket of claim 1 wherein, The gap between the sealing ring and the hole wall of the through hole is not less than 0.4 mm.

3. The gasket of claim 1 wherein, The sealing gasket further comprises a limiting structure for limiting rotation of the sealing ring around a central axis of the sealing ring.

4. The gasket of claim 3 wherein, The limiting structure is arranged between the sealing ring and the base plate; and / or, the limiting structure is arranged between the sealing ring and the outer layer plate.

5. The gasket of claim 4 wherein, The limiting structure comprises a protrusion and a recess that match each other.

6. The gasket of claim 1 wherein, The sealing ring is a single-layer sealing plate, and the sealing plate and the outer layer plate have a deformation space therebetween, and a thickness difference between the base plate and the sealing plate is not more than 0.3 mm; or the sealing ring comprises a plurality of sealing plates stacked along an axial direction of the sealing ring, and adjacent two sealing plates or the sealing plate and the outer layer plate have a deformation space therebetween, and a thickness difference between the base plate and a total thickness of the plurality of sealing plates is not more than 0.3 mm.

7. The gasket of claim 1 wherein, The sealing ring comprises a plurality of sealing plates stacked along an axial direction of the sealing ring, and a foolproof structure is arranged between adjacent sealing plates.

8. The gasket of claim 1 wherein, The sealing ring comprises a plurality of sealing plates stacked along an axial direction of the sealing ring, and the plurality of sealing plates satisfy: adjacent two sealing plates are symmetrical to each other; and / or, adjacent two sealing plates are stacked in the same direction; and / or, one of adjacent two sealing plates is a flat plate or a corrugated plate in a radial direction.

9. The gasket of claim 1 wherein, The sealing ring comprises at least one sealing plate, and the sealing plate comprises: a plurality of flat plate portions arranged in a radial direction, and two flat plate portions adjacent in the radial direction being arranged in an axial direction in a staggered manner; a connecting portion connected to the two flat plate portions adjacent in the radial direction; wherein the flat plate portion and the adjacent sealing plate or outer layer plate form a deformation space, and at least one flat plate portion is provided with a support structure on a side facing the deformation space.

10. The gasket of claim 8 wherein, At least two adjacent sealing plates are attached to each other at an outer ring of the sealing ring to form an attachment portion, and the attachment portion and the base plate have a height overlap region in the axial direction.

11. An engine characterized by, The engine comprises the sealing gasket according to any one of claims 1 to 10.

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