Exhaust pipe and engine

Abstract

The utility model belongs to the technical field of engines, and particularly relates to an exhaust pipe and an engine. The exhaust pipe comprises a main pipe part, a branch pipe part and a stress compensation piece, an inner cavity of the main pipe part is provided with an exhaust port, a first air inlet and a second air inlet, the exhaust port is communicated with the first air inlet and the second air inlet respectively, and the branch pipe part is connected to the end of the first air inlet. An inner cavity of the branch pipe part is communicated with an inner cavity of the main pipe part through the first air inlet, the branch pipe part and the main pipe part are of an integrally-formed structure, the stress compensation piece is connected to the end of the second air inlet, an exhaust channel is formed in the stress compensation piece, and the exhaust channel is communicated with the inner cavity of the main pipe part through the second air inlet. According to the exhaust pipe, when high-temperature gas in the exhaust pipe flows through, the stress of the exhaust pipe can be well released, and the low-cycle fatigue problem of the exhaust pipe and the sealing problem caused by deformation of the exhaust pipe can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of engines, and in particular relates to an exhaust pipe and an engine. Background Art

[0002] The exhaust gas generated by the combustion in the cylinder of the engine is collected into the exhaust pipe through the exhaust duct, and then discharged into the atmosphere through the supercharger, exhaust tail pipe, etc. In order to optimize and improve the low-cycle fatigue life of the exhaust pipe, the traditional exhaust pipe is usually designed as a split multi-stage structure, but due to the large number of sealing positions, it is easy to cause gas leakage, which reduces the sealing performance. Utility Model Content

[0003] The purpose of the utility model is to at least solve the problem of poor sealing performance of the existing exhaust pipe. This purpose is achieved through the following technical solutions:

[0004] The first aspect of the utility model provides an exhaust pipe, comprising:

[0005] A main pipe part, wherein the inner cavity of the main pipe part has an exhaust port, a first air inlet and a second air inlet, and the exhaust port is respectively connected to the first air inlet and the second air inlet;

[0006] A branch pipe portion, the branch pipe portion is connected to the end of the first air inlet, the inner cavity of the branch pipe portion is connected to the inner cavity of the main pipe portion through the first air inlet, and the branch pipe portion and the main pipe portion are an integrally formed structure;

[0007] A stress compensating member is connected to the end of the second air inlet, and an exhaust passage is provided in the stress compensating member, and the exhaust passage is communicated with the inner cavity of the main pipe part through the second air inlet.

[0008] According to the exhaust pipe of the utility model, the main pipe part and the branch pipe part are an integrated structure. Compared with the multi-section split pipe body in the prior art, the problem of poor sealing between the multi-section split pipe bodies can be avoided, and the sealing performance of the overall exhaust pipe is improved. In addition, stress compensation parts are added at the air inlet that needs stress compensation, such as the second air inlet, so that the stress of the exhaust pipe can be well released when the high-temperature gas in the exhaust pipe flows through, and the low-cycle fatigue problem of the exhaust pipe and the sealing problem caused by deformation of the exhaust pipe can be solved.

[0009] In addition, the exhaust pipe according to the utility model may also have the following additional technical features:

[0010] In some embodiments of the present invention, the stress compensation component includes an expansion joint and a mounting flange, opposite sides of the expansion joint are respectively connected to the mounting flange and the second air inlet, and the exhaust passage runs through the expansion joint and the mounting flange.

[0011] In some embodiments of the present invention, the expansion joint includes a first mounting portion, a second mounting portion and a corrugated main portion, the first mounting portion and the second mounting portion are respectively connected to opposite sides of the corrugated main portion, the end of the first mounting portion facing away from the corrugated main portion is connected to the main pipe portion, the end of the second mounting portion facing away from the corrugated main portion is connected to the mounting flange, and the exhaust passage sequentially passes through the first mounting portion, the corrugated main portion and the second mounting portion.

[0012] In some embodiments of the present invention, the first mounting portion and the main pipe portion, as well as the second mounting portion and the mounting flange are connected by bolts.

[0013] In some embodiments of the present invention, the first mounting portion and the corrugated main body portion, as well as the second mounting portion and the corrugated main body portion are both connected by welding.

[0014] In some embodiments of the present invention, the branch pipe portion includes a connecting portion and a flange portion, opposite sides of the connecting portion are respectively connected to the main pipe portion and the flange portion, and an inner cavity of the branch pipe portion passes through the connecting portion and the flange portion.

[0015] In some embodiments of the present invention, at least one first air inlet is provided, at least one branch pipe portion is provided, and the branch pipe portion corresponds to the first air inlet one by one;

[0016] There is at least one second air inlet, and there is at least one stress compensation member, and the stress compensation member corresponds to the second air inlet one by one.

[0017] The second aspect of the utility model provides an engine, comprising:

[0018] An exhaust pipe, wherein the exhaust pipe is the exhaust pipe mentioned above;

[0019] A cylinder head having an exhaust passage therein, the branch pipe portion being connected to the cylinder head and the inner cavity of the branch pipe portion being communicated with the exhaust passage, the stress compensation component being connected to the cylinder head and the exhaust passage being communicated with the exhaust passage.

[0020] In some embodiments of the present invention, a first sealing gasket is provided between the branch pipe portion and the cylinder head and between the stress compensation member and the cylinder head, respectively.

[0021] In some embodiments of the present invention, the branch pipe portion and the stress compensating member are respectively connected to the cylinder head via fixing bolts, and the fixing bolts are abutted against the branch pipe portion and the stress compensating member via a second sealing gasket. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0023] Figure 1 The schematic diagram of the structure of the exhaust pipe according to the embodiment of the utility model is schematically shown;

[0024] Figure 2 for Figure 1 A partial structural diagram of the explosion structure of the middle exhaust pipe;

[0025] Figure 3 for Figure 2 Structural diagram of the middle expansion joint;

[0026] Figure 4 for Figure 2 A structural diagram of the middle expansion joint from another perspective;

[0027] Figure 5 The schematic diagram of the assembly structure of the exhaust pipe and the cylinder head according to the embodiment of the utility model is schematically shown;

[0028] Figure 6 for Figure 5 Schematic diagram of the partial structure of the cylinder head and exhaust pipe assembly structure from another perspective.

[0029] The reference numerals in the accompanying drawings represent the following:

[0030] 100. Exhaust pipe;

[0031] 10. The competent department;

[0032] 20. branch pipe part; 21. connection part; 22. flange part;

[0033] 30. stress compensating member; 31. expansion joint; 311. corrugated main body; 312. first mounting portion; 313. second mounting portion; 32. mounting flange; 321. fixing bolt;

[0034] 40. a first sealing gasket;

[0035] 50. second sealing gasket;

[0036] 200. Cylinder head. DETAILED DESCRIPTION

[0037] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0038] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0039] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0040] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both above and below orientations.

[0041] The exhaust gas generated by combustion in the engine cylinder is collected into the exhaust pipe through the exhaust duct, and then discharged into the atmosphere through the supercharger, exhaust tail pipe, etc. With the upgrade of emission regulations and the increase of engine power density, the exhaust temperature is getting higher and higher, and the exhaust temperature before the engine turbine sometimes reaches more than 700℃, which brings great challenges to the exhaust system, especially the reliability of the exhaust pipe.

[0042] The impact of the increase in exhaust temperature on the exhaust pipe can be simply summarized into two parts. The first is the reliability of the exhaust pipe itself. As the exhaust temperature increases, the low-cycle fatigue life of the exhaust pipe will significantly decrease. The second is the reliability of the exhaust pipe gasket seal. As the exhaust temperature increases, the deformation of the exhaust pipe increases. The deformation of the pipe body will pull the flange of the exhaust pipe to deform. When the exhaust pipe gasket cannot compensate for this deformation, the exhaust pipe will leak.

[0043] Figure 1 The structure diagram of the exhaust pipe according to the embodiment of the utility model is schematically shown. Figure 1 As shown, the utility model proposes an exhaust pipe 100 and an engine. The exhaust pipe 100 in the utility model includes a main pipe part 10, a branch pipe part 20 and a stress compensation part 30. The inner cavity of the main pipe part 10 has an exhaust port, a first air inlet and a second air inlet. The exhaust port is connected to the first air inlet and the second air inlet respectively. The branch pipe part 20 is connected to the end of the first air inlet. The inner cavity of the branch pipe part 20 is connected to the inner cavity of the main pipe part 10 through the first air inlet. The branch pipe part 20 and the main pipe part 10 are an integrated structure. The stress compensation part 30 has an exhaust channel. The stress compensation part 30 is connected to the end of the second air inlet. The exhaust channel is connected to the inner cavity of the main pipe part 10 through the second air inlet.

[0044] According to the exhaust pipe 100 of the present invention, the main pipe portion 10 and the branch pipe portion 20 are an integrated structure. Compared with the multi-section split pipe body in the prior art, the problem of poor sealing between the multi-section split pipe bodies can be avoided, and the sealing performance of the overall exhaust pipe 100 is improved. In addition, a stress compensation member 30 is added at the air inlet that needs stress compensation, such as the second air inlet, so that the stress of the exhaust pipe 100 can be well released when the high-temperature gas in the exhaust pipe 100 flows through, and the low-cycle fatigue problem of the exhaust pipe 100 and the sealing problem caused by deformation of the exhaust pipe 100 can be solved.

[0045] In some embodiments of the present invention, Figure 2As shown, the stress compensating member 30 includes an expansion joint 31 and a mounting flange 32. The opposite sides of the expansion joint 31 are connected to the mounting flange 32 and the second air inlet respectively, and the exhaust passage runs through the expansion joint 31 and the mounting flange 32. In this embodiment, since the expansion joint 31 itself has a relatively small rigidity and is a soft connection structure, the stress generated by the exhaust pipe 100 and the cylinder head 200 will not be transmitted to the main pipe 10, and the thermal deformation generated by the exhaust pipe 100 will not be transmitted to the mounting flange 32. All of them will act on the expansion joint 31 of the stress compensating member 30, thereby achieving the purpose of releasing the stress of the exhaust pipe 100, which can not only improve the low-cycle fatigue life of the exhaust pipe 100, but also is very effective in improving the surface pressure of the gasket between the exhaust pipe 100 and the cylinder head 200, thereby improving the reliability and service life of the gasket.

[0046] Specifically, in this embodiment, the mounting flange 32 has a first through hole, and the inner space of the first through hole is a part of the exhaust passage, which can accommodate gas and is used for gas flow. The mounting flange 32 is used to connect with the cylinder head 200, and bolt holes are processed on the mounting flange 32 and the main pipe 10 for fixing by bolts, wherein the bolts can be designed in the form of hexagon socket bolts to reduce assembly space.

[0047] In some embodiments of the present invention, Figure 3 and 4 As shown, the expansion joint 31 includes a first mounting portion 312, a second mounting portion 313 and a corrugated main body 311, the first mounting portion 312 and the second mounting portion 313 are respectively connected to opposite sides of the corrugated main body 311, one end of the first mounting portion 312 away from the corrugated main body 311 is connected to the main pipe 10, and one end of the second mounting portion 313 away from the corrugated main body 311 is connected to the mounting flange 32, and the exhaust passage sequentially passes through the first mounting portion 312, the corrugated main body 311 and the second mounting portion 313. In this embodiment, the first mounting portion 312 is used to connect the main pipe 10 and the corrugated main body 311, and the second mounting portion 313 is used to connect the mounting flange 32 and the corrugated main body 311. The outer diameter of the first mounting portion 312 and the outer diameter of the second mounting portion 313 are respectively larger than the outer diameter of the corrugated main body 311, so that the arrangement can facilitate the protection of the corrugated main body 311 and prevent the structural components outside the exhaust pipe 100 from interfering with the corrugated main body 311.

[0048] Specifically, in this embodiment, the corrugated main body 311 includes a main body, the outer surface of which is provided with a plurality of corrugated structures arranged at intervals, and the main body has a hollow structure inside, which is a part of the exhaust channel. The plurality of corrugated structures on the corrugated body are used to reduce the connection stiffness to achieve the purpose of "decoupling".

[0049] Specifically, in this embodiment, a second through hole is provided on the first mounting portion 312, a third through hole is provided on the second mounting portion 313, and the internal space of the second through hole, the hollow structure, the internal space of the third through hole and the internal space of the first through hole together constitute an exhaust passage.

[0050] In some embodiments of the present invention, the first mounting portion 312 and the main pipe portion 10 and the second mounting portion 313 and the mounting flange 32 are all bolted. In this embodiment, the bolted connection can improve the connection strength between the main pipe portion 10 and the expansion joint 31 and the connection strength between the expansion joint 31 and the mounting flange 32, and the bolted connection facilitates the disassembly and assembly operation of the expansion joint 31 and the mounting flange 32 and the disassembly and assembly operation between the expansion joint 31 and the main pipe portion 10.

[0051] In some embodiments of the present invention, the first mounting portion 312 and the corrugated main body 311 and the second mounting portion 313 and the corrugated main body 311 are both welded. In this embodiment, since the expansion joint 31 is a single component, the opposite sides of the corrugated main body 311 are respectively connected to the first mounting portion 312 and the second mounting portion 313 by welding, which can improve the connection strength, and at the same time, the structure is simple, the production efficiency is high, and the application range is wide.

[0052] In some embodiments of the present invention, Figure 1 As shown, the branch pipe portion 20 includes a connecting portion 21 and a flange portion 22. The opposite sides of the connecting portion 21 are connected to the main pipe portion 10 and the flange portion 22 respectively. The inner cavity of the branch pipe portion 20 passes through the connecting portion 21 and the flange portion 22. In this embodiment, the connecting portion 21 is used to connect the flange portion 22 and the main pipe portion 10, and the flange portion 22 is used to fix the exhaust pipe 100 on the cylinder head 200, so as to facilitate the gas to flow from the inner cavity of the branch pipe portion 20 to the main pipe portion 10 and finally flow out of the exhaust pipe 100.

[0053] In some embodiments of the present invention, Figure 1 As shown, at least one first air inlet is provided, at least one branch pipe portion 20 is provided, and the branch pipe portion 20 corresponds to the first air inlet one by one. At least one second air inlet is provided, at least one stress compensation member 30 is provided, and the stress compensation member 30 corresponds to the second air inlet one by one. In this embodiment, the number of first air inlets is four, the number of second air inlets is two, the number of branch pipe portions 20 is four, the number of stress compensation members 30 is two, and the two stress compensation members 30 are respectively connected to the ends of the two second air inlets, and the four branch pipe portions 20 are connected to the ends of the four first air inlets.

[0054] Specifically, in order to bear the gravity of the exhaust pipe 100, the flange portion 22 of the branch pipe portion 20 of the exhaust pipe 100 of cylinders 1 to 6 needs to be determined according to the simulation calculation results, and the branch pipe portion 20 is removed and replaced with a stress compensation member 30 in one or several cylinders with greater stress, so as to release the stress caused by deformation. The other cylinders are non-expansion joint 31 structures to bear the weight of the exhaust pipe 100 itself.

[0055] Furthermore, the high-temperature exhaust gas in the present invention enters the exhaust pipe 100 through the exhaust passage of the cylinder head 200. The exhaust pipe 100 will produce creep deformation under the influence of the high-temperature exhaust gas. In the conventional exhaust pipe 100 structure, since the flange part 22 and the main body of the branch pipe part 20 of the exhaust pipe 100 are integrally cast, and the flange part 22 is bolted to the cylinder head 200, the creep deformation of the exhaust pipe 100 cannot be fully released due to the constraint of the bolts, which will cause stress concentration at the position of the exhaust pipe 100. The exhaust pipe 100 in this embodiment is connected through the expansion joint 31 of the stress compensation part 30. Since the rigidity of the expansion joint 31 is relatively soft, the mounting flange 32 and the main pipe part 10 are decoupled, and the constraint of the bolts will not be transmitted to the main pipe part 10 of the exhaust pipe 100. The main pipe part 10 of the exhaust pipe 100 is relatively free, and even if thermal stress is generated, it will be released, which can greatly improve the low-cycle fatigue life of the exhaust pipe 100.

[0056] Specifically, the second advantage of the exhaust pipe 100 of this embodiment is that it can improve the seal between the exhaust pipe 100 and the cylinder head 200. In the exhaust pipe 100 of the conventional structure, when the exhaust pipe 100 tube body undergoes creep deformation, the flange portion 22 of the branch pipe portion 20 of the exhaust pipe 100 will be pulled to deform accordingly. When the relative deformation between the flange portion 22 of the exhaust pipe 100 and the joint surface of the cylinder head 200 exceeds the compensation amount of the gasket, the exhaust pipe 100 will have a leakage failure. In the exhaust pipe 100 of this embodiment, since the mounting flange 32 and the expansion joint 31 are decoupled, the deformation of the main pipe portion 10 will not affect the mounting flange 32, and the deformation of the mounting flange 32 is very small, thereby ensuring the sealing reliability.

[0057] Specifically, the third advantage of the exhaust pipe 100 of this embodiment is that the main pipe portion 10 and the branch pipe portion 20 are designed as a one-stage structure, which avoids the problem of sealing between the segments of the split multi-stage exhaust pipe 100. In order to optimize and improve the low-cycle fatigue life of the exhaust pipe 100, the traditional exhaust pipe 100 is usually designed as a split multi-stage structure, but the sealing between the split multi-stages not only increases the cost, but also is a risk point for gas leakage. Due to the structural advantages, the exhaust pipe 100 in this embodiment has a lower low-cycle fatigue life than the traditional structure exhaust pipe 100, so it can be designed as an integrated structure to reduce costs.

[0058] The utility model also proposes an engine, such as Figure 5 and 6 As shown, including:

[0059] An exhaust pipe 100, the exhaust pipe 100 is the exhaust pipe 100 mentioned above;

[0060] The cylinder head 200 has an exhaust passage therein, the branch pipe portion 20 is connected to the cylinder head 200 and the inner cavity of the branch pipe portion 20 is communicated with the exhaust passage, and the stress compensation member 30 is connected to the cylinder head 200 and the exhaust passage is communicated with the exhaust passage.

[0061] According to the engine of the utility model, a combined structure of a cylinder head 200 and an exhaust pipe 100 is adopted, and the exhaust gas discharged from the exhaust passage of the cylinder head 200 respectively enters the inner cavity of the branch pipe part 20 and the exhaust channel of the stress compensation part 30, and then flows into the inner cavity of the main pipe part 10 after merging, and finally flows out of the exhaust pipe 100 and reaches the next component for processing, wherein the main pipe part 10 and the branch pipe part 20 are an integrated structure, compared with the multi-section split pipe body in the prior art, it can avoid the problem of poor sealing between the multi-section split pipe bodies, and improve the sealing performance of the overall exhaust pipe 100, in addition, adding a stress compensation part 30 at the air inlet that needs stress compensation, such as the second air inlet, can make the stress of the exhaust pipe 100 be well released when the high-temperature gas in the exhaust pipe 100 flows through, and can solve the low-cycle fatigue problem of the exhaust pipe 100 and the sealing problem caused by deformation of the exhaust pipe 100.

[0062] In some embodiments of the present invention, Figure 6 As shown, a first sealing gasket 40 is respectively provided between the branch pipe portion 20 and the cylinder head 200 and between the stress compensation member 30 and the cylinder head 200. In this embodiment, the first sealing gasket 40 can seal the space gap between the exhaust pipe 100 and the cylinder head 200 to ensure that the gas does not flow out of the space gap, thereby improving the sealing performance between the cylinder head 200 and the exhaust pipe 100.

[0063] In some embodiments of the present invention, Figure 6As shown, the branch pipe part 20 and the stress compensating member 30 are connected to the cylinder head 200 through the fixing bolts 321, respectively, and the fixing bolts 321 are abutted against the branch pipe part 20 and the stress compensating member 30 through the second sealing gasket. In this embodiment, the fixing bolt 321 includes a bolt part and a head part connected to each other, and the bolt part will pass through the flange part 22 of the branch pipe part 20 and the cylinder head 200 in sequence. When the head part fits the branch pipe part 20, the cylinder head 200 and the exhaust pipe 100 can be locked. Since there is a second sealing gasket 50 between the head part and the branch pipe part 20, the fixing bolt 321 can be prevented from crushing the flange surface of the flange part 22, thereby improving the reliability and service life of the branch pipe part 20. Similarly, the bolt portion will pass through the mounting flange 32 of the stress compensation component 30 and the cylinder head 200 in sequence. When the head is in contact with the mounting flange 32, the cylinder head 200 and the exhaust pipe 100 can be locked. Since there is a second sealing gasket 50 between the head and the mounting flange 32, the fixing bolt 321 can be prevented from crushing the flange surface of the mounting flange 32, thereby improving the reliability and service life of the stress compensation component 30.

[0064] Furthermore, in this embodiment, it is necessary to design the specific structure of the exhaust pipe 100 according to the boundary of the whole vehicle and the layout of the whole engine. First, the exhaust pipe 100 is subjected to thermal-mechanical coupling simulation calculation, and the low-cycle fatigue life of the exhaust pipe 100 and the surface pressure of the first sealing gasket 40 between the exhaust pipe 100 and the cylinder head 200 are calculated. The relatively weak area is determined according to the distribution of the surface pressure or the low-cycle fatigue life, that is, the position where the life or surface pressure does not meet the requirements. The reason is that the exhaust pipe 100 is deformed due to heat at this position, and the flange portion 22 of the branch pipe portion 20 of the exhaust pipe 100 is bolted to the cylinder head 200. The thermal deformation makes it impossible to release the stress due to the constraint of the bolts, resulting in stress concentration. At the position where the service life does not meet the requirements, the branch pipe part 20 of the exhaust pipe 100 is "disconnected" from the main pipe part 10 and connected through the stress compensation part 30. Since the expansion joint 31 of the stress compensation part 30 has low rigidity and is a soft connection structure, the stress generated by tightening the bolts will not be transmitted to the main pipe part 10, and the thermal deformation generated will not be transmitted to the flange part 22 of the branch pipe part 20 of the exhaust pipe 100, thereby achieving the purpose of stress release. It can not only improve the low-cycle fatigue life of the exhaust pipe 100, but also is very effective in improving the surface pressure of the first gasket between the exhaust pipe 100 and the cylinder head 200.

[0065] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An exhaust pipe, characterized in that: include: A main pipe part, wherein the inner cavity of the main pipe part has an exhaust port, a first air inlet and a second air inlet, and the exhaust port is respectively connected to the first air inlet and the second air inlet; A branch pipe portion, the branch pipe portion is connected to the end of the first air inlet, the inner cavity of the branch pipe portion is connected to the inner cavity of the main pipe portion through the first air inlet, and the branch pipe portion and the main pipe portion are an integrally formed structure; A stress compensating member is connected to the end of the second air inlet, and an exhaust passage is provided in the stress compensating member, and the exhaust passage is communicated with the inner cavity of the main pipe part through the second air inlet.

2. The exhaust pipe according to claim 1, characterized in that: The stress compensation component includes an expansion joint and a mounting flange, the opposite sides of the expansion joint are respectively connected to the mounting flange and the second air inlet, and the exhaust passage runs through the expansion joint and the mounting flange.

3. The exhaust pipe according to claim 2, characterized in that: The expansion joint includes a first mounting portion, a second mounting portion and a corrugated main portion, the first mounting portion and the second mounting portion are respectively connected to opposite sides of the corrugated main portion, the end of the first mounting portion facing away from the corrugated main portion is connected to the main pipe portion, the end of the second mounting portion facing away from the corrugated main portion is connected to the mounting flange, and the exhaust passage sequentially passes through the first mounting portion, the corrugated main portion and the second mounting portion.

4. The exhaust pipe according to claim 3, characterized in that: The first mounting portion and the main pipe portion as well as the second mounting portion and the mounting flange are both connected by bolts.

5. The exhaust pipe according to claim 3, characterized in that: The first mounting portion and the corrugated main body portion as well as the second mounting portion and the corrugated main body portion are both connected by welding.

6. The exhaust pipe according to claim 1, characterized in that The branch pipe portion includes a connecting portion and a flange portion, and opposite sides of the connecting portion are respectively connected to the main pipe portion and the flange portion, and an inner cavity of the branch pipe portion passes through the connecting portion and the flange portion.

7. The exhaust pipe according to claim 1, characterized in that: There is at least one first air inlet, and at least one branch pipe portion, and the branch pipe portion corresponds to the first air inlet one by one; There is at least one second air inlet, and there is at least one stress compensation member, and the stress compensation member corresponds to the second air inlet one by one.

8. An engine, characterized in that: include: An exhaust pipe, wherein the exhaust pipe is the exhaust pipe according to any one of claims 1 to 7; A cylinder head having an exhaust passage therein, the branch pipe portion being connected to the cylinder head and the inner cavity of the branch pipe portion being communicated with the exhaust passage, the stress compensation component being connected to the cylinder head and the exhaust passage being communicated with the exhaust passage.

9. The engine according to claim 8, characterized in that A first sealing gasket is respectively provided between the branch pipe portion and the cylinder head and between the stress compensation member and the cylinder head.

10. The engine according to claim 8, characterized in that The branch pipe portion and the stress compensating member are respectively connected to the cylinder head via fixing bolts, and the fixing bolts are abutted against the branch pipe portion and the stress compensating member via a second sealing gasket.

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