Exhaust system and internal combustion engine apparatus including same

Abstract

The utility model relates to an exhaust system and an internal combustion engine apparatus including the same. The exhaust system comprises a first exhaust component and a first exhaust shell, the first exhaust component is provided with a first exhaust function part, the first exhaust shell is provided with a first exhaust shell body part and a first exhaust shell extension part, and the first exhaust shell extension part extends downstream from the first exhaust shell body part; the first exhaust shell body part surrounds the first exhaust functional part; the second exhaust component is provided with a second exhaust function part and a second exhaust shell, the second exhaust function part is located on the downstream of the first exhaust function part, and the second exhaust shell surrounds the second exhaust function part.

Description

Technical Field

[0001] The present application relates to an exhaust system and an internal combustion engine device including the same. Background Art

[0002] The exhaust system processes the hot exhaust gas generated by the internal combustion engine through various upstream exhaust components to reduce the emission pollutants. The various upstream exhaust components may include one or more of the following components: pipes, filters, valves, catalysts, mufflers, etc.

[0003] For example, the upstream exhaust component guides the exhaust gas to an exhaust component having an inlet and an outlet and having a diesel oxidation catalyst (DOC) as an exhaust functional part. An exhaust component having a diesel particulate filter (DPF) as an exhaust functional part may be provided downstream of the diesel oxidation catalyst. Downstream of the diesel oxidation catalyst and the optional diesel particulate filter is a selective catalytic reduction reactor (SCR) having an inlet and an outlet. The outlet passes the exhaust gas to the downstream exhaust component. The mixer is generally positioned at the outlet of the DOC or downstream of the DPF and upstream of the inlet of the SCR. In the mixer, the exhaust gas is fully mixed with a reducing agent such as a urea aqueous solution injected into the mixer, and discharged to the SCR for a reduction reaction to generate nitrogen and water to reduce the nitrogen oxide emissions of the engine.

[0004] For example Figure 1 As shown, taking an exhaust system with a DPF as an example, the maintenance of the exhaust system generally requires removing the DPF to replace the DPF filter after a certain operating time or mileage to ensure the normal operation of the DPF and avoid abnormal increase in exhaust back pressure due to DPF clogging.

[0005] In such Figure 1 In the comparative scheme shown, since corresponding connection structures are respectively provided at the upstream and downstream ends of the DPF, and the DOC on the upstream side and the mixer on the downstream side are respectively connected through the first clamp 701 and the second clamp 702, the first clamp 701 on the upstream side and the second clamp 702 on the downstream side need to be disassembled respectively when performing exhaust system maintenance. In addition, since the sealing of the exhaust system needs to be ensured, the corresponding sealing structure is also required at the clamp connection. Therefore, Figure 1 The comparative scheme shown will result in inconvenient maintenance work and high cost of the exhaust system, and further improvement is required. Utility Model Content

[0006] An object of the present application is to provide an exhaust system.

[0007] Another object of the present application is to provide an internal combustion engine device.

[0008] An exhaust system according to one aspect of the present application includes: a first exhaust component having a first exhaust functional part, and a first exhaust shell, the first exhaust shell having a first exhaust shell body and a first exhaust shell extension, the first exhaust shell extension extending downstream from the first exhaust shell body, the first exhaust shell body surrounding the first exhaust functional part; a second exhaust component having a second exhaust functional part, and a second exhaust shell, the second exhaust functional part being located downstream of the first exhaust functional part, the second exhaust shell surrounding the second exhaust functional part; a third exhaust component having a third exhaust functional part, and a third exhaust shell, the third exhaust functional part being located downstream of the second exhaust functional part, the third exhaust shell having a third exhaust shell body and a third exhaust shell. The third exhaust housing extension portion extends upstream from the third exhaust housing main body portion, and the third exhaust housing main body portion surrounds the third exhaust functional component; wherein the second exhaust housing is provided with a second connecting portion on the radially outer side, the first exhaust housing extension portion has a first extending section and a first connecting section, the first extending section is located on the radially outer side of the second exhaust housing and covers a first axial length of the second exhaust housing; the third exhaust housing extension portion has a third extending section and a third connecting section, the third extending section is located on the radially outer side of the second exhaust housing and covers a second axial length of the second exhaust housing, and the second connecting portion is respectively connected to the first connecting section and the third connecting section, so that the first exhaust component, the second exhaust component and the third exhaust component can be detachably connected.

[0009] In one or more embodiments of the exhaust system, the second connecting portion includes an annular protrusion; the first connecting section includes a first flared portion flaring radially outward from the first extension section, and the third connecting section includes a third flared portion flaring radially outward from the third extension section; the first flared portion is connected to the upstream side wall of the annular protrusion, and the third flared portion is connected to the downstream side wall of the annular protrusion.

[0010] In one or more embodiments of the exhaust system, a seal is provided between the inner wall of the first flared portion and the upstream side wall of the annular protrusion, and between the third flared portion and the downstream side wall of the annular protrusion.

[0011] In one or more embodiments of the exhaust system, a clamp is further included, wherein a clamping portion of the clamp abuts against an outer wall of the first flared portion and an outer portion of the third flared portion, respectively.

[0012] In one or more embodiments of the exhaust system, the clamp is a clamp.

[0013] In one or more embodiments of the exhaust system, a heat shield is provided on the radial periphery of the first exhaust housing body portion and / or the third exhaust housing body portion, and no heat shield is provided on the radial periphery of the first axial length and the second axial length of the second exhaust housing.

[0014] In one or more embodiments of the exhaust system, the first exhaust function is a diesel oxidation catalyst (DOC), the second exhaust function is a diesel particulate filter (DPF), and the third exhaust function is a mixer.

[0015] In one or more embodiments of the exhaust system, the first exhaust component, the second exhaust component, and the third exhaust component are coaxially arranged to form an in-line exhaust system.

[0016] In one or more embodiments of the exhaust system, the second connecting portion is axially located in the middle of the axial length of the second exhaust housing, so that the first axial length and the second axial length are substantially equal.

[0017] An internal combustion engine device according to one aspect of the present application comprises an internal combustion engine and an exhaust system as described above, wherein the exhaust system is used to process exhaust gas generated by the internal combustion engine.

[0018] The improved effects of the above-described embodiments include but are not limited to: by providing a second connection portion on the second exhaust component, providing a first exhaust shell extension portion covering a first axial length of the second exhaust shell, providing a third exhaust shell extension portion covering a second axial length of the second exhaust shell, and a structure in which the second connection portion is connected to the first connection segment and the third connection segment respectively, the second exhaust component located in the middle can realize a detachable connection between the first exhaust component, the second exhaust component, and the third exhaust component through only one connection structure, compared with Figure 1 As shown in the comparative scheme, the technical solution of the embodiment can be realized in that it is easy to disassemble and the related sealing components are reduced, thereby reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other features, properties and advantages of the present application will become more apparent through the following description in conjunction with the accompanying drawings and embodiments. It should be noted that the drawings are only examples and are not drawn in proportion. They should not be used to limit the actual scope of protection claimed by the present application, including:

[0020] Figure 1 It is a schematic diagram of the structure of the exhaust system of a comparative scheme.

[0021] Figure 2It is a schematic structural diagram of an exhaust system of an embodiment.

[0022] Figure 3 It is a schematic diagram of the partial structure of an exhaust system of an embodiment.

[0023] Figure 4A , Figure 4B , Figure 4C Each of the diagrams is a schematic diagram of each step of a disassembly process of an exhaust system according to an embodiment.

[0024] Figure 5 The present invention is a schematic structural block diagram of an internal combustion engine device according to an embodiment.

[0025] Reference numerals:

[0026] 1000-Internal combustion engine equipment

[0027] 100-Exhaust system

[0028] 200-Internal combustion engine

[0029] 1-First exhaust component

[0030] 11-First exhaust function part

[0031] 12-First exhaust housing

[0032] 121- first exhaust casing body

[0033] 122-First exhaust housing extension

[0034] 1221-First extension

[0035] 1222-First connection section

[0036] 1223-First expansion part

[0037] 2- Second exhaust component

[0038] 21- Second exhaust function part

[0039] 22- Second exhaust housing

[0040] 221-First axial length

[0041] 222-Second axial length

[0042] 23- Second connection part

[0043] 230-Ring-shaped protrusion

[0044] 2301-Upstream side wall

[0045] 2302-Downstream side wall

[0046] 3-Third exhaust component

[0047] 31- Third exhaust function part

[0048] 32-Third exhaust housing

[0049] 321- third exhaust shell body

[0050] 322- Third exhaust housing extension

[0051] 3221-Third extension

[0052] 3222-Third connection section

[0053] 3223-Third expansion part

[0054] 4-Seals

[0055] 5-Clamp

[0056] 6-Heat shield

[0057] 701-First fixture

[0058] 702-Second clamp. DETAILED DESCRIPTION

[0059] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0061] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0062] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0064] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0065] According to some embodiments of the present application, reference Figure 5 As shown, the present application also provides an internal combustion engine device 1000, including an exhaust system 100 which will be described in detail in the following embodiments, and an internal combustion engine 200, wherein the exhaust system 100 is used to process the exhaust gas generated by the internal combustion engine 200.

[0066] The internal combustion engine equipment 1000 includes but is not limited to vehicles that use internal combustion engines as power drive, such as vehicles, including passenger cars, commercial vehicles, construction machinery, agricultural machinery, rail transit trains, etc. The vehicles can also be, for example, ships and aircraft powered by internal combustion engines. The internal combustion engine equipment also includes power generation systems that use internal combustion engines as power drive, such as diesel generator systems and biogas generator sets of biogas power stations. In order to meet the requirements of relevant emission regulations for vehicles and power generation systems, an exhaust system is used to treat the exhaust generated by the internal combustion engines of the vehicles and power generation systems.

[0067] refer to Figure 2 as well as Figure 3 As shown, in some embodiments, the exhaust system 100 includes a first exhaust component 1 , a second exhaust component 2 , and a third exhaust component 3 .

[0068] Among them, the first exhaust component 1 has a first exhaust functional part 11 and a first exhaust shell 12, the first exhaust shell 12 has a first exhaust shell body part 121 and a first exhaust shell extension part 122, the first exhaust shell extension part 122 extends downstream from the first exhaust shell body part 121, and the first exhaust shell body part 121 surrounds the first exhaust functional part 11.

[0069] The second exhaust component 2 has a second exhaust function 21 , which is located downstream of the first exhaust function 11 , and a second exhaust housing 22 which surrounds the second exhaust function 21 .

[0070] The third exhaust component 3 has a third exhaust functional part 31 and a third exhaust shell 32. The third exhaust functional part 31 is located downstream of the second exhaust functional part 21. The third exhaust shell 32 has a third exhaust shell body part 321 and a third exhaust shell extension part 322. The third exhaust shell extension part 322 extends upstream from the third exhaust shell body part 321. The third exhaust shell body part 321 surrounds the third exhaust functional part 31.

[0071] refer to Figure 2 as well as Figure 3 As shown, the second exhaust shell 22 is provided with a second connecting portion 23 on the radial outer side. The second connecting portion 23 can be welded to the second exhaust shell 22, or can be stamped integrally from the second exhaust shell 22, or can even be connected to the second exhaust shell 22 by screws, rivets, etc., without being limited thereto.

[0072] The first exhaust casing extension 122 has a first extension section 1221 and a first connecting section 1222, and the first extension section 1221 is located on the radial outer side of the second exhaust casing 22 and covers the first axial length 221 of the second exhaust casing 22; the third exhaust casing extension 322 has a third extension section 3221 and a third connecting section 3222, and the third extension section 3221 is located on the radial outer side of the second exhaust casing 22 and covers the second axial length 222 of the second exhaust casing 22, and the second connecting section 23 is respectively connected to the first connecting section 1222 and the third connecting section 3222, so that the first exhaust component 1, the second exhaust component 2, and the third exhaust component 3 are detachably connected.

[0073] “Upstream” and “downstream” refer to the flow direction of the exhaust gas in the exhaust system 100 .

[0074] Exhaust functional parts refer to components that realize specific functions of exhaust components. For example, the first exhaust functional part 11 can be a diesel oxidation catalyst (DOC), the second exhaust functional part 21 can be a diesel particulate filter (DPF), and the third exhaust functional part 31 can be a mixer. The diesel oxidation catalyst and diesel particulate filter introduced above are common terms in this field, but are not limited to DOC and DPF, which can only be used in the exhaust after-treatment system of diesel engines. For example, for gasoline engines, DOC and DPF can also be set in some scenarios. The exhaust gas discharged from the internal combustion engine passes through the diesel oxidation catalyst in turn, which is used to treat unburned hydrocarbons and carbon monoxide in the exhaust gas, and the diesel particulate filter, which is used to treat particulate pollutants in the exhaust gas, and then enters the mixer, where it is mixed with the reducing agent liquid sprayed by the injector, which is generally a spray of urea solution. The mixed gas flows out of the mixer and then enters the selective catalytic reduction reactor. The mixed gas flows through the reduction reaction to generate nitrogen and water to treat nitrogen oxides in the exhaust gas. It can be understood that the exhaust components are not limited to those described above. For example, in some exhaust after-treatment systems, the particulate trap can be omitted.

[0075] As can be seen from the above, the beneficial effects of the exhaust system introduced by the above embodiment include but are not limited to, by setting the second connecting portion on the second exhaust component, and setting the first exhaust shell extension portion to cover the first axial length of the second exhaust shell, the third exhaust shell extension portion to cover the second axial length of the second exhaust shell, and the second connecting portion to connect the first connecting section and the third connecting section respectively, so that the second exhaust component located in the middle can realize the detachable connection of the first exhaust component, the second exhaust component, and the third exhaust component through only one connecting structure, compared with Figure 1 Compared with the comparative scheme shown, the technical solution of the embodiment can achieve easy disassembly and reduce related sealing components, thereby reducing costs.

[0076] refer to Figure 3 ,as well as FIG. 4A to FIG. 4CAs shown, in some embodiments, the specific structures of the second connection part, the first connection section, and the third connection section can be that the second connection part 23 includes an annular protrusion 230; the first connection section 1222 includes a first flared portion 1223 flared radially outward from the first extension section 1221, and the third connection section 3222 includes a third flared portion 3223 flared radially outward from the third extension section 3221; the first flared portion 1223 is connected to the upstream side wall 2301 of the annular protrusion, and the third flared portion 3223 is connected to the downstream side wall 2302 of the annular protrusion. In addition, the exhaust system 100 can also include a clamp 5, the clamping part of the clamp 5 is respectively abutted against the outer wall of the first flared portion 1223 and the outer part of the third flared portion 3223, and the specific structure of the clamp 5 can be, for example, a clamp, but is not limited thereto, so that the second exhaust component 12 can be further facilitated to be disassembled and installed in the exhaust system.

[0077] The specific disassembly process can be referenced FIG. 4A to FIG. 4C As shown, Figure 4A As shown, first disassemble the fixture 5, then Figure 4B As shown, the third exhaust component 3 is moved downstream as a whole, the third exhaust component 3 is removed, and the third exhaust component 3 is combined with Figure 4C As shown, the first exhaust component 1 is moved upstream as a whole to remove the first exhaust component 1, so that the second exhaust function part 21 of the second exhaust component 2 can be replaced, for example, the filter element of the DPF can be replaced. It can be understood that Figure 4B , Figure 4C The order of the steps can be interchanged, that is, the first exhaust component 1 is removed first, and then the third exhaust component 3 is removed.

[0078] Continue to refer Figure 3 ,as well as FIG. 4A to FIG. 4C As shown, in some embodiments, a seal 4 is provided between the inner wall of the first flared portion 1223 and the upstream side wall 2301 of the annular protrusion, and between the third flared portion 3223 and the downstream side wall 2302 of the annular protrusion. The seal 4 may be a sealing gasket between the inner wall of the first flared portion 1223 and the upstream side wall 2301 of the annular protrusion, and between the third flared portion 3223 and the downstream side wall 2302 of the annular protrusion, or may be an integrated sealing ring, which integrally covers the annular protrusion 230 on the radially outer side, and is not limited thereto. Such a beneficial effect is that the sealing performance of the structure can be further enhanced, and exhaust gas can be reduced from flowing out of the connection structure between the flared portion and the annular protrusion.

[0079] like Figure 2As shown, in some embodiments, the distribution of the first exhaust component 1, the second exhaust component 2, and the third exhaust component 3 can be that the first exhaust component 1, the second exhaust component 2, and the third exhaust component 3 are coaxially arranged to form an in-line exhaust system. It can be understood that the second exhaust component is provided with a second connection portion, and the first exhaust shell extension portion covers the first axial length of the second exhaust shell, the third exhaust shell extension portion covers the second axial length of the second exhaust shell, and the second connection portion is respectively connected to the first connection section and the third connection section. For the in-line exhaust system, on the basis of easy disassembly and reduced cost, compared with Figure 1 The comparative scheme of the connection structure at both ends of the second exhaust component 2 shown in the figure can further shorten the overall axial length of the in-line exhaust system. The inventors found that the length of the upstream side and the downstream side can be reduced by 50mm-60mm, that is, the total length can be reduced by 100mm-120mm, making the exhaust system more compact. It can be understood that the above-mentioned coaxial arrangement is not strictly coaxial, but allows a certain coaxiality error.

[0080] Continue to refer Figure 2 as well as Figure 3 As shown, in some embodiments, the position of the second connection portion 23 can be such that the second connection portion 23 is axially located in the middle of the axial length of the second exhaust housing 22, so that the first axial length 221 and the second axial length 222 are substantially equal. In this way, the force distribution of the exhaust system as a whole is more uniform, further improving the structural stability. It can be understood that the substantially equal and located in the middle of the axial length here can allow a certain error, such as generally an error of 5%-10%.

[0081] contrast Figure 1 as well as Figure 2 As shown, compared to Figure 1 For the comparison scheme shown, Figure 2 The embodiments shown in the drawings have the following similarities: a heat shield 6 is provided on the radial periphery of the first exhaust housing body 121 and / or the third exhaust housing body 321; however, the difference is that: Figure 2In the shown embodiment, the second exhaust casing 22 is not provided with a heat shield 6 on the radial periphery, that is, the heat shield 6 is not provided on the radial periphery of the first axial length 221 and the second axial length 222 of the second exhaust casing 22. Since the first extension section 1221 is located on the radial outer side of the second exhaust casing 22 and covers the first axial length 221 of the second exhaust casing 22, and the third extension section 3221 is located on the radial outer side of the second exhaust casing 22 and covers the second axial length 222 of the second exhaust casing 22, in some embodiments, even if the heat shield 6 is not provided in the second exhaust casing 22, the thermal insulation requirements can be met. The beneficial effect of this is that the cost of the exhaust system can be further reduced.

[0082] As can be seen from the above, the beneficial effects of the exhaust system and the internal combustion engine equipment introduced in the above embodiments are not limited to, by setting the second connecting portion on the second exhaust component, and setting the first exhaust shell extension portion to cover the first axial length of the second exhaust shell, the third exhaust shell extension portion to cover the second axial length of the second exhaust shell, and the second connecting portion to respectively connect the first connecting section and the third connecting section, so that the second exhaust component located in the middle can achieve detachable connection between the first exhaust component, the second exhaust component, and the third exhaust component through only one connecting structure, compared with Figure 1 As shown in the comparative scheme, the technical solution of the embodiment can be realized in that it is easy to disassemble and the related sealing components are reduced, thereby reducing the cost.

[0083] Although the present application is disclosed in the above embodiments, it is not intended to limit the present application. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, any modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application shall fall within the scope of protection defined by the claims of the present application.

Claims

1. An exhaust system (100), characterized in that: include: A first exhaust component (1) having a first exhaust functional part (11) and a first exhaust housing (12), wherein the first exhaust housing (12) has a first exhaust housing body (121) and a first exhaust housing extension (122), wherein the first exhaust housing extension (122) extends downstream from the first exhaust housing body (121), and the first exhaust housing body (121) surrounds the first exhaust functional part (11); A second exhaust component (2) having a second exhaust function part (21) and a second exhaust housing (22), wherein the second exhaust function part (21) is located downstream of the first exhaust function part (11), and the second exhaust housing (22) surrounds the second exhaust function part (21); A third exhaust component (3) comprising a third exhaust functional part (31) and a third exhaust housing (32), wherein the third exhaust functional part (31) is located downstream of the second exhaust functional part (21), and the third exhaust housing (32) comprises a third exhaust housing body (321) and a third exhaust housing extension (322), wherein the third exhaust housing extension (322) extends upstream from the third exhaust housing body (321), and the third exhaust housing body (321) surrounds the third exhaust functional part (31); The second exhaust shell (22) is provided with a second connecting portion (23) on the radial outer side, the first exhaust shell extension portion (122) has a first extension section (1221) and a first connecting section (1222), the first extension section (1221) is located on the radial outer side of the second exhaust shell (22) and covers the first axial length (221) of the second exhaust shell (22); the third exhaust shell extension portion (322) has a third extension section (3221) and a third connecting section (3222), the third extension section (3221) is located on the radial outer side of the second exhaust shell (22) and covers the second axial length (222) of the second exhaust shell (22), the second connecting portion (23) is respectively connected to the first connecting section (1222) and the third connecting section (3222), so that the first exhaust component (1), the second exhaust component (2) and the third exhaust component (3) are detachably connected.

2. The exhaust system (100) according to claim 1, characterized in that The second connecting portion (23) includes an annular protrusion (230); the first connecting section (1222) includes a first flared portion (1223) flaring radially outward from the first extension section (1221); the third connecting section (3222) includes a third flared portion (3223) flaring radially outward from the third extension section (3221); the first flared portion (1223) is connected to the upstream side wall (2301) of the annular protrusion, and the third flared portion (3223) is connected to the downstream side wall (2302) of the annular protrusion.

3. The exhaust system (100) according to claim 2, characterized in that A seal (4) is provided between the inner wall of the first flared portion (1223) and the upstream side wall (2301) of the annular protrusion, and between the third flared portion (3223) and the downstream side wall (2302) of the annular protrusion.

4. The exhaust system (100) according to claim 2, characterized in that It also includes a clamp (5), the clamping part of which is in contact with the outer wall of the first flared part (1223) and the outside of the third flared part (3223) respectively.

5. The exhaust system (100) according to claim 4, characterized in that The clamp (5) is a clamp.

6. The exhaust system (100) according to claim 1, characterized in that A heat shield (6) is provided on the radial periphery of the first exhaust shell body part (121) and / or the third exhaust shell body part (321), and no heat shield (6) is provided on the radial periphery of the first axial length (221) and the second axial length (222) of the second exhaust shell (22).

7. The exhaust system (100) according to claim 1, characterized in that The first exhaust function component (11) is a diesel oxidation catalyst (DOC), the second exhaust function component (21) is a diesel particulate filter (DPF), and the third exhaust function component (31) is a mixer.

8. The exhaust system (100) according to claim 1, characterized in that The first exhaust component (1), the second exhaust component (2), and the third exhaust component (3) are coaxially arranged to form an in-line exhaust system.

9. The exhaust system (100) according to claim 1, characterized in that The second connecting portion (23) is axially located at the middle of the axial length of the second exhaust housing (22), so that the first axial length (221) and the second axial length (222) are substantially equal.

10. An internal combustion engine device (1000), characterized in that: It comprises an internal combustion engine (200) and an exhaust system (100) according to any one of claims 1 to 9, wherein the exhaust system (100) is used for treating exhaust gas generated by the internal combustion engine (200).

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