Sealing structure for exhaust manifold and engine and engineering equipment applying sealing structure

Abstract

The utility model relates to the technical field of sealing structures, and discloses a sealing structure for an exhaust manifold and an engine and engineering equipment applying the sealing structure, the sealing structure comprises a body, a first sealing layer and a second sealing layer, the body comprises a first structural layer and a second structural layer, and the first structural layer and the second structural layer are stacked and connected; an exhaust hole and at least two connecting holes are formed in the body, and the at least two connecting holes are formed in the circumferential direction of the exhaust hole at intervals; the at least two connecting pieces are respectively arranged in the at least two connecting holes in a penetrating manner; the connecting piece comprises a central part and a first flange part and a second flange part which extend around the central part, and a through hole is formed in the central part and used for being connected with an exhaust manifold; the first flange part and the second flange part are located on the outer sides of the first structural layer and the second structural layer correspondingly and jointly clamped and fixed to at least part of structures of the first structural layer and the second structural layer. By means of the technical scheme, the risk that the structural layers of the body are prone to stress deformation and staggered layers are generated is reduced or even eliminated, and the sealing effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing structures, in particular to a sealing structure for an exhaust manifold and an engine and engineering equipment using the sealing structure. Background Art

[0002] The engine exhaust manifold gasket is an important part of engine sealing. It is set between the intake end of the exhaust manifold and the exhaust end of the cylinder head. Its function is to ensure that the engine exhaust gas does not leak to the outside during the exhaust process.

[0003] In related technologies, after the exhaust manifold gasket is assembled, its two sides contact the exhaust manifold and cylinder head, respectively. In high-temperature environments, the exhaust manifold and cylinder head deform differently, squeezing the exhaust manifold gasket. This can easily cause misalignment between the gasket's structural layers, leading to seal failure and impacting engine performance and fuel economy. Utility Model Content

[0004] In view of this, the present invention provides a sealing structure for an exhaust manifold and an engine and engineering equipment using the same, so as to solve the problem that structural layers of the exhaust manifold gasket are prone to misalignment during use, resulting in sealing failure of the exhaust manifold gasket.

[0005] In the first aspect, the utility model provides a sealing structure for an exhaust manifold, comprising: a main body, the main body comprising a first structural layer and a second structural layer which are stacked and connected; the main body is formed with an exhaust hole and at least two connecting holes, and the at least two connecting holes are arranged at circumferential intervals around the exhaust hole; at least two connecting members are respectively passed through the at least two connecting holes; the connecting member comprises a central portion and a first flange portion and a second flange portion extending around the central portion, and a through hole is formed in the central portion, and the through hole is used to connect with the exhaust manifold; the first flange portion and the second flange portion are respectively located on the outside of the first structural layer and the second structural layer, and are clamped and fixed together on at least part of the structure of the first structural layer and the second structural layer.

[0006] In an optional embodiment, the main body also includes an intermediate structural layer, which is located between the first structural layer and the second structural layer; around the connecting hole, the first structural layer protrudes from the intermediate structural layer and forms a first annular convex portion, and the second structural layer protrudes from the intermediate structural layer and forms a second annular convex portion; the first flange portion and the second flange portion are clamped and fixed on the first annular convex portion and the second annular convex portion.

[0007] In an optional embodiment, the main body further includes a limiting layer, two intermediate structural layers are provided, and the limiting layer is located between the two intermediate structural layers; surrounding the connecting hole, the limiting layer protrudes from the intermediate structural layer, and the protruding part is located between the first flange portion and the second flange portion.

[0008] In an optional embodiment, the two intermediate structural layers are the third structural layer and the fourth structural layer, the third structural layer and the first structural layer are adjacent to each other, and the fourth structural layer and the second structural layer are adjacent to each other; around the circumference of the exhaust hole, a first annular hollow portion is formed between the first structural layer and the third structural layer, and a second annular hollow portion is formed between the second structural layer and the fourth structural layer.

[0009] In an optional embodiment, around the first annular hollow portion, the first structural layer and the third structural layer are fitted together and jointly form a first edge portion; the first annular hollow portion includes a first inclined section and a first straight section connected to each other, and the first inclined section is connected between the first edge portion and the first straight section; in the first inclined section, the first structural layer and the third structural layer are spaced apart and extend in directions away from each other; in the first straight section, the first structural layer and the third structural layer are spaced apart and arranged in parallel; and / or, around the second annular hollow portion, the second structural layer and the fourth structural layer are fitted together and jointly form a second edge portion; the second annular hollow portion includes a second inclined section and a second straight section connected to each other, and the second inclined section is connected between the second edge portion and the second straight section; in the second inclined section, the second structural layer and the fourth structural layer are spaced apart and extend in directions away from each other; in the second straight section, the second structural layer and the fourth structural layer are spaced apart and arranged in parallel.

[0010] In an optional embodiment, the body has a plurality of welding points, which are used to connect the first structural layer and the second structural layer; the plurality of welding points are arranged at circumferential intervals around the exhaust hole and are staggered with at least two connecting holes.

[0011] In an optional embodiment, the first structural layer includes a first surface away from the second structural layer, and the second structural layer includes a second surface away from the first structural layer; both the first surface and the second surface are provided with a friction-reducing coating; and the friction-reducing coating is a boron nitride coating.

[0012] In an optional embodiment, the body further includes a protrusion, which protrudes from the edge of the body.

[0013] In a second aspect, the present invention further provides an engine, comprising: a cylinder head and an exhaust manifold; and a sealing structure such as the above-mentioned sealing structure, which is connected between the cylinder head and the exhaust manifold.

[0014] In a third aspect, the present invention further provides an engineering equipment, comprising: the engine as described above; or, the sealing structure as described above.

[0015] Utilizing the technical solution of this utility model, in the sealing structure, after the first and second structural layers of the main body are connected, the connectors utilize the connection holes to clamp and secure at least portions of the first and second structural layers, further securing the main body's structural layers. This arrangement improves the connection strength between the main body's structural layers, reduces or even eliminates the risk of deformation and misalignment between the main body's structural layers under stress, and makes it easier for the sealing structure to adapt to deformation of the exhaust manifold under thermal stress, significantly enhancing the overall sealing performance of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a perspective view of a sealing structure for an exhaust manifold according to an embodiment of the present utility model;

[0018] Figure 2 A plan view of a sealing structure for an exhaust manifold according to an embodiment of the present utility model;

[0019] Figure 3 for Figure 2 The cross-sectional view of section AA and its partial enlarged schematic diagram;

[0020] Figure 4 for Figure 2 Cross-sectional view of BB and its partial enlarged schematic diagram.

[0021] Description of reference numerals:

[0022] 10. Main body; 11. First structural layer; 111. First annular protrusion; 112. First surface; 12. Second structural layer; 121. Second annular protrusion; 122. Second surface; 13. Third structural layer; 14. Fourth structural layer; 15. Positioning layer; 101. Exhaust hole; 102. Connecting hole; 103. Welding point; 104. Protrusion; 105. First annular hollow portion; 1051. First inclined section; 1052. First straight section; 106. First edge portion; 107. Second annular hollow portion; 1071. Second inclined section; 1072. Second straight section; 108. Second edge portion;

[0023] 20. Connecting member; 21. Central portion; 22. First flange portion; 23. Second flange portion; 24. Through hole. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0025] The following combination Figures 1 to 4 , describing the embodiments of the present utility model.

[0026] According to an embodiment of the present invention, on the one hand, a sealing structure for an exhaust manifold is provided, such as Figure 1 and Figure 2 As shown, the sealing structure includes a body 10 and at least two connecting members 20. The body 10 is formed with an exhaust hole 101 and at least two connecting holes 102. The at least two connecting holes 102 are spaced apart circumferentially around the exhaust hole 101. The at least two connecting members 20 are respectively inserted into the at least two connecting holes 102.

[0027] like Figure 4 As shown, the main body 10 includes a first structural layer 11 and a second structural layer 12 that are stacked and connected. The connecting member 20 includes a central portion 21 and a first flange portion 22 and a second flange portion 23 extending around the central portion 21. A through hole 24 is formed in the central portion 21, and the through hole 24 is used to connect to the exhaust manifold. The first flange portion 22 and the second flange portion 23 are respectively located on the outside of the first structural layer 11 and the second structural layer 12, and are clamped and fixed together on at least part of the structure of the first structural layer 11 and the second structural layer 12. It should be noted that the outside of the first structural layer 11 specifically refers to the side of the first structural layer 11 away from the second structural layer 12, and the outside of the second structural layer 12 specifically refers to the side of the second structural layer 12 away from the first structural layer 11.

[0028] It can be understood that the first structural layer 11 and the second structural layer 12 are respectively the two outermost structural layers of the body 10 .

[0029] It can be understood that the exhaust holes 101 and the connection holes 102 are arranged along the thickness direction of the body 10 , and more specifically, along the stacking direction of the first structural layer 11 and the second structural layer 12 .

[0030] The present invention does not specifically limit the connection method between the first structural layer 11 and the second structural layer 12 of the main body 10. For example, the first structural layer 11 and the second structural layer 12 can be connected by welding, bonding, etc. In the technical solution of the present invention, after the first structural layer 11 and the second structural layer 12 of the main body 10 are connected, the connecting member 20 uses the connecting hole 102 to clamp and fix at least part of the structure of the first structural layer 11 and the second structural layer 12 to further fix the structural layer of the main body 10. Such an arrangement improves the connection strength between the various structural layers of the main body 10, reduces or even eliminates the risk of deformation and misalignment between the various structural layers of the main body 10, makes it easier for the sealing structure to adapt to the deformation of the exhaust manifold under thermal stress, and greatly enhances the overall sealing performance of the sealing structure.

[0031] Furthermore, the sealing structure is typically secured to the exhaust manifold and cylinder using bolts and the connection holes 102 in the sealing structure. The connector 20 of the present invention is disposed within the connection holes 102, eliminating the need for additional space within the body 10, thereby saving costs and facilitating manufacturing. It will be appreciated that the central portion 21 of the connector 20 of the present invention includes a through hole 24 for passage of a bolt or other connecting structure to securely connect the connector to the exhaust manifold, etc.

[0032] The present invention does not impose any specific limitation on the number of structural layers of the body 10 , as long as the sealing function can be achieved.

[0033] In some embodiments not shown, the main body 10 includes two structural layers, namely a first structural layer 11 and a second structural layer 12. The first structural layer 11 and the second structural layer 12 are fixedly connected, and through the connecting hole 102, the first flange portion 22 and the second flange portion 23 of the connecting member 20 are clamped and fixed to at least part of the structure of the first structural layer 11 and the second structural layer 12.

[0034] In some embodiments, the body 10 further includes an intermediate structural layer located between the first structural layer 11 and the second structural layer 12 .

[0035] like Figure 4As shown, the first structural layer 11 protrudes from the intermediate structural layer around the connection hole 102 of the main body 10, that is, around the through hole 24 of the connector 20, and forms a first annular protrusion 111. Furthermore, the second structural layer 12 protrudes from the intermediate structural layer around the connection hole 102 of the main body 10, that is, around the through hole 24 of the connector 20, and forms a second annular protrusion 121. The first flange portion 22 and the second flange portion 23 are clamped and fixed to the first annular protrusion 111 and the second annular protrusion 121. With this arrangement, the intermediate structural layer is wrapped between the first structural layer 11 and the second structural layer 12. By clamping and fixing the first annular protrusion 111 and the second annular protrusion 121, the first flange portion 22 and the second flange portion 23 achieve fixation between the stacked structural layers and prevent the first flange portion 22 and the second flange portion 23 from being too thick, thereby ensuring the sealing performance of the sealing structure.

[0036] In some embodiments, the body 10 further includes a limiting layer 15, and two intermediate structural layers are provided, with the limiting layer 15 being located between the two intermediate structural layers. Surrounding the connection hole 102, that is, surrounding the through hole 24 of the connector 20, the limiting layer 15 protrudes from the intermediate structural layer, and the protruding portion is located between the first flange portion 22 and the second flange portion 23. In this embodiment, the limiting layer 15 is also clamped and fixed between the first flange portion 22 and the second flange portion 23, ensuring the stability of the position of the limiting layer 15, preventing the limiting layer 15 from being deformed by force, or from being misaligned relative to other structural layers, further ensuring the sealing effect of the sealing structure.

[0037] Specifically, in some embodiments, Figure 4 As shown, the two intermediate structural layers are the third structural layer 13 and the fourth structural layer 14, respectively. The limiting layer 15 is located between the third structural layer 13 and the fourth structural layer 14. The third structural layer 13 is adjacent to the first structural layer 11, and the fourth structural layer 14 is adjacent to the second structural layer 12. The central portion 21 of the connector 20 extends axially along the connecting hole 102, while the first flange portion 22 and the second flange portion 23 both extend radially along the connecting hole 102, that is, radially along the through hole 24, more specifically, extending away from the connecting hole 102 and the through hole 24. The central portion 21, the first flange portion 22, and the second flange portion 23 together form an annular groove, which is disposed toward the body 10. At least a portion of the first structural layer 11, the second structural layer 12, and the limiting layer 15 of the body 10 are clamped and fixed within the annular groove, more specifically, the first annular protrusion 111, the second annular protrusion 121, and at least a portion of the limiting layer 15 are clamped and fixed within the annular groove.

[0038] It can be understood that in this embodiment, along the thickness direction of the body 10 , the first structural layer 11 , the third structural layer 13 , the limiting layer 15 , the fourth structural layer 14 , and the second structural layer 12 are stacked in sequence.

[0039] It should be noted that the intermediate structural layer can be set to one, two, three, four or other numbers, and accordingly, the limiting layer 15 can also be set to one, two, three, four or other numbers. The present invention does not make specific limitations on this.

[0040] In addition, the present invention does not specifically limit the number of connection holes 102 and connection members 20. For example, Figure 1 and Figure 2 As shown, both the connection holes 102 and the connection members 20 can be provided in four positions. The four connection holes 102 are arranged at intervals circumferentially around the exhaust hole 101, and the four connection members 20 are respectively inserted into the four connection holes 102. It is understood that the number of connection holes 102 and the number of connection members 20 can be the same or different. The number of connection members 20 can be greater than the number of connection holes 102. During installation, additional mounting holes can be provided on the body 10, and some of the connection members 20 can be inserted into the mounting holes. Alternatively, the number of connection members 20 can be less than the number of connection holes 102.

[0041] In some embodiments, the body 10 has a plurality of welding points 103, which are used to connect the first structural layer 11 and the second structural layer 12. The plurality of welding points 103 are arranged at intervals around the circumference of the exhaust hole 101 and are staggered with at least two connection holes 102. It will be understood that in some embodiments, the body 10 further includes the aforementioned intermediate structural layer and limiting layer 15, and the welding points 103 are used to connect the first structural layer 11, the second structural layer 12, the intermediate structural layer, and the limiting layer 15.

[0042] That is, in this embodiment, each structural layer can be connected by spot welding to form the aforementioned welding points 103. The present invention does not impose a specific limit on the number of welding points 103 provided, as long as the connection function between multiple structural layers can be achieved. Preferably, at least one welding point 103 is provided between each adjacent connection hole 102.

[0043] With such an arrangement, the structural layers of the main body 10 are fixedly connected by a plurality of welding points 103, and combined with the clamping fixation of the connecting piece 20, the connection strength between the structural layers of the main body 10 is ensured, so as to reduce or even eliminate the risk of deformation and misalignment of the structural layers due to stress, thereby improving the sealing effect of the sealing structure.

[0044] For example, Figure 1 and Figure 2 As shown, a vent hole 101 is provided in the middle of the body 10, and the welding point 103 is located on the outer peripheral side of the vent hole 101, that is, on the edge of the body 10. For example, Figure 3As shown, the body 10 includes the first structural layer 11, the second structural layer 12, the third structural layer 13, and the fourth structural layer 14. The edges of the first structural layer 11 and the third structural layer 13 are aligned and together form a first edge portion 106. The edges of the second structural layer 12 and the fourth structural layer 14 are aligned and together form a second edge portion 108. A plurality of welding points 103 can be arranged at intervals on the first edge portion 106 and the second edge portion 108 to securely connect the various structural layers of the first edge portion 106 and the second edge portion 108.

[0045] It is understandable that the connection holes 102 are also provided on the first edge portion 106 and the second edge portion 108. The connection holes 102 and the welding points 103 are both provided outside the exhaust hole 101 and are spaced apart around the circumference of the exhaust hole 101.

[0046] For example, four connection holes 102 are provided, and accordingly, four welding points 103 are also provided. The above-mentioned connecting members 20 are provided in each of the four connection holes 102. The four connection holes 102 and the four welding points 103 are staggered around the circumference of the exhaust hole 101 to ensure the connection strength between the various structural layers. It is understandable that the number of connection holes 102 and the connection members 20 provided can be the same as or different from the number of welding points 103 provided. The number of welding points 103 provided can be greater than the number of connection holes 102 and the connection members 20 provided, that is, multiple welding points 103 can be provided between two adjacent connection holes 102 or connection members 20. Of course, in some cases, the number of welding points 103 provided can also be less than the number of connection holes 102 and the connection members 20 provided.

[0047] Furthermore, in some embodiments, Figure 1 、 Figure 2 and Figure 3 As shown, the two intermediate structural layers are the third structural layer 13 and the fourth structural layer 14. The third structural layer 13 is disposed adjacent to the first structural layer 11, while the fourth structural layer 14 is disposed adjacent to the second structural layer 12. Around the circumference of the exhaust hole 101, a first annular hollow portion 105 is formed between the first structural layer 11 and the third structural layer 13, and a second annular hollow portion 107 is formed between the second structural layer 12 and the fourth structural layer 14. It can be understood that the exhaust hole 101 of the sealing structure is connected to the intake end of the exhaust manifold and the exhaust end of the cylinder head. The first annular hollow portion 105 and the second annular hollow portion 107 surrounding the exhaust hole 101 ensure the sealing performance between the exhaust manifold and the cylinder head.

[0048] In some embodiments, around the exhaust hole 101 , the first annular hollow portion 105 may protrude from the second annular hollow portion, or the second annular hollow portion 107 may protrude from the first annular hollow portion 105 .

[0049] In some embodiments, as Figure 3 As shown, around the first annular hollow portion 105, the first structural layer 11 and the third structural layer 13 are in contact with each other and together form a first edge portion 106. The first annular hollow portion 105 includes a first inclined section 1051 and a first straight section 1052, and the first inclined section 1051 is connected between the first edge portion 106 and the first straight section 1052. In the first inclined section 1051, the first structural layer 11 and the third structural layer 13 are spaced apart and extend in directions away from each other. In the first straight section 1052, the first structural layer 11 and the third structural layer 13 are spaced apart and parallel to each other. That is, in this embodiment, around the exhaust hole 101, the first annular hollow portion 105 forms a half-wave structure to improve the sealing effect.

[0050] In some embodiments, as Figure 3 As shown, around the second annular hollow portion 107, the second structural layer 12 and the fourth structural layer 14 are in contact with each other and together form a second edge portion 108. The second annular hollow portion 107 includes a second inclined section 1071 and a second straight section 1072, and the second inclined section 1071 is connected between the second edge portion 108 and the second straight section 1072. In the second inclined section 1071, the second structural layer 12 and the fourth structural layer 14 are spaced apart and extend in directions away from each other. In the second straight section 1072, the second structural layer 12 and the fourth structural layer 14 are spaced apart and parallel. That is, in this embodiment, around the exhaust hole 101, the second annular hollow portion 107 forms a half-wave structure to improve the sealing effect.

[0051] It should be noted that the above-mentioned limiting layer 15 is arranged on the outside of the first annular hollow portion or the second annular hollow portion 107, and is located between the first edge portion 106 and the second edge portion 108, so as to avoid the first annular hollow portion 105 and the second annular hollow portion 107 being flattened during use, thereby ensuring the reliability of the seal.

[0052] In some embodiments not shown, the first annular hollow portion 105 and / or the second annular hollow portion 107 surrounding the exhaust hole 101 may also adopt a full-wave structure, which will not be described in detail here.

[0053] In some embodiments, the first structural layer 11 includes a first surface 112 distal from the second structural layer 12, and the second structural layer 12 includes a second surface 122 distal from the first structural layer 11. Both the first surface 112 and the second surface 122 are provided with a friction-reducing coating to reduce friction between the body 10 and the exhaust manifold and cylinder head, thereby minimizing or even eliminating the risk of deformation or misalignment of the structural layers of the body 10 due to mutual friction. Preferably, the friction-reducing coating may be a boron nitride coating, which provides a more effective friction-reducing effect. Of course, in some embodiments, the friction-reducing layer may also be made of other friction-reducing materials.

[0054] In some embodiments, the body 10 further includes a protrusion 104, which protrudes from the edge of the body 10 to facilitate identification of the sealing structure installed between the exhaust manifold and the cylinder head, thereby ensuring the power and economy of the engine. It is understood that the protrusion 104 can be integrally formed with the body 10, that is, the protrusion 104 can be directly formed by the first structural layer 11, the second structural layer 12, the intermediate structural layer, and the limiting layer 15.

[0055] According to another aspect of an embodiment of the present invention, an engine is provided, comprising a cylinder head, an exhaust manifold, and a sealing structure as described in any of the above embodiments, the sealing structure being connected between the cylinder head and the exhaust manifold. Specifically, a body 10 of the sealing structure is provided with a connection hole 102, within which a connector 20 is mounted. The cylinder head, exhaust manifold, and sealing structure can be bolted together via a through-hole 24 of the connector 20, or directly bolted together via the connection hole 102 of the body 10.

[0056] According to an embodiment of the present invention, in another aspect, an engineering equipment is provided, comprising the engine as described in the above embodiment; or comprising the sealing structure as described in any of the above embodiments.

[0057] This utility model does not specifically limit the type of engineering equipment; any equipment that utilizes the sealing structure or engine of this utility model is within the scope of protection of this utility model. For example, this engineering equipment may include heavy trucks, trailers, excavators, anchor miners, bulldozers, road rollers, and concrete pump trucks, as well as mechanical equipment such as tower cranes, construction elevators, and material hoists.

[0058] Since the engine and engineering equipment of the present invention include the sealing structure of the above embodiment, they have the same technical effects as the sealing structure of the present invention, and are not described in detail here.

[0059] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A sealing structure for an exhaust manifold, characterized in that: include: A body (10), the body (10) comprising a first structural layer (11) and a second structural layer (12) which are stacked and connected; the body (10) is formed with an exhaust hole (101) and at least two connecting holes (102), the at least two connecting holes (102) being arranged at intervals in the circumferential direction around the exhaust hole (101); At least two connecting members (20) are respectively inserted into the at least two connecting holes (102); the connecting member (20) includes a central portion (21) and a first flange portion (22) and a second flange portion (23) extending around the central portion (21); a through hole (24) is formed in the central portion (21), and the through hole (24) is used to connect with the exhaust manifold; the first flange portion (22) and the second flange portion (23) are respectively located on the outside of the first structural layer (11) and the second structural layer (12), and are clamped and fixed together on at least part of the structure of the first structural layer (11) and the second structural layer (12).

2. The sealing structure for an exhaust manifold according to claim 1, characterized in that: The body (10) further includes an intermediate structural layer, wherein the intermediate structural layer is located between the first structural layer (11) and the second structural layer (12); Around the connecting hole (102), the first structural layer (11) protrudes from the intermediate structural layer to form a first annular convex portion (111), and the second structural layer (12) protrudes from the intermediate structural layer to form a second annular convex portion (121); the first flange portion (22) and the second flange portion (23) are clamped and fixed on the first annular convex portion (111) and the second annular convex portion (121).

3. The sealing structure for an exhaust manifold according to claim 2, characterized in that: The body (10) further includes a limiting layer (15), two intermediate structural layers are provided, and the limiting layer (15) is located between the two intermediate structural layers; surrounding the connection hole (102), the limiting layer (15) protrudes from the intermediate structural layer, and the protruding portion is located between the first flange portion (22) and the second flange portion (23).

4. The sealing structure for an exhaust manifold according to claim 3, characterized in that: The two intermediate structural layers are respectively a third structural layer (13) and a fourth structural layer (14); the third structural layer (13) and the first structural layer (11) are arranged adjacent to each other, and the fourth structural layer (14) and the second structural layer (12) are arranged adjacent to each other; Around the circumference of the exhaust hole (101), a first annular hollow portion (105) is formed between the first structural layer (11) and the third structural layer (13), and a second annular hollow portion (107) is formed between the second structural layer (12) and the fourth structural layer (14).

5. The sealing structure for an exhaust manifold according to claim 4, characterized in that: Around the first annular hollow portion (105), the first structural layer (11) and the third structural layer (13) are in contact with each other and together form a first edge portion (106); the first annular hollow portion (105) includes a first inclined section (1051) and a first straight section (1052) connected to each other, and the first inclined section (1051) is connected between the first edge portion (106) and the first straight section (1052); in the first inclined section (1051), the first structural layer (11) and the third structural layer (13) are spaced apart and extend in directions away from each other; in the first straight section (1052), the first structural layer (11) and the third structural layer (13) are spaced apart and parallel to each other; and / or, Around the second annular hollow portion (107), the second structural layer (12) and the fourth structural layer (14) are in contact with each other and together form a second edge portion (108); the second annular hollow portion (107) includes a second inclined section (1071) and a second straight section (1072) connected to each other, and the second inclined section (1071) is connected between the second edge portion (108) and the second straight section (1072); in the second inclined section (1071), the second structural layer (12) and the fourth structural layer (14) are spaced apart and extend in directions away from each other; in the second straight section (1072), the second structural layer (12) and the fourth structural layer (14) are spaced apart and parallel to each other.

6. The sealing structure for an exhaust manifold according to any one of claims 1 to 5, characterized in that: The body (10) has a plurality of welding points (103), and the welding points (103) are used to connect the first structural layer (11) and the second structural layer (12); the plurality of welding points (103) are arranged at circumferential intervals around the exhaust hole (101) and are staggered with the at least two connection holes (102).

7. The sealing structure for an exhaust manifold according to any one of claims 1 to 5, characterized in that: The first structural layer (11) includes a first surface (112) away from the second structural layer (12), and the second structural layer (12) includes a second surface (122) away from the first structural layer (11); the first surface (112) and the second surface (122) are both provided with a friction-reducing coating; the friction-reducing coating is a boron nitride coating.

8. The sealing structure for an exhaust manifold according to any one of claims 1 to 5, characterized in that: The body (10) further comprises a protruding portion (104), wherein the protruding portion (104) protrudes from the edge of the body (10).

9. An engine, characterized in that: include: cylinder heads and exhaust manifolds; The sealing structure according to any one of claims 1 to 8, wherein the sealing structure is connected between the cylinder head and the exhaust manifold.

10. An engineering equipment, characterized in that: include: The engine as claimed in claim 9; Alternatively, the sealing structure according to any one of claims 1 to 8.

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