Air outlet assembly and exhaust aftertreatment device

Abstract

The air outlet assembly comprises an air outlet pipe, a net-shaped element and a porous medium element installed in the net-shaped element, the porous medium element is arranged in the net-shaped element, the net-shaped element is fixedly welded to the inner wall of the air outlet pipe, and the porous medium element is not welded to the inner wall of the air outlet pipe; the air outlet pipe is configured to enable exhaust gas to flow out of the exhaust gas aftertreatment device, and the porous medium element is configured to enable the exhaust gas to penetrate through the porous medium element so as to reduce noise of the exhaust gas. The utility model further discloses an exhaust aftertreatment device comprising the air outlet assembly. Compared with the prior art, the mesh-shaped element is welded with the air outlet pipe, and the porous medium element is not welded with the air outlet pipe, so that the welding cost is obviously reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of air outlet assembly and exhaust gas aftertreatment device, belong to engine exhaust gas aftertreatment technical field. BACKGROUND

[0002] The exhaust gas aftertreatment device in the related art usually includes an outer housing, an air inlet pipe and an air outlet pipe. In some cases, the exhaust gas aftertreatment device further includes an exhaust gas aftertreatment carrier encapsulated in the outer housing, and the exhaust gas aftertreatment carrier is one or more of a diesel oxidation catalyst carrier (DOC carrier), a diesel particulate filter carrier (DPF carrier) and a selective catalytic reduction carrier (SCR carrier). In some embodiments, the exhaust gas aftertreatment device is used to treat exhaust gas of a diesel engine and exhaust gas of a natural gas engine. In other embodiments, the exhaust gas aftertreatment carrier is a three-way catalytic converter carrier (TWC carrier), and in this case, the exhaust gas aftertreatment device is used to treat exhaust gas of a gasoline engine.

[0003] It is understood by those skilled in the art that the acoustic performance of the exhaust gas aftertreatment device is highly related to the volume of the air outlet cavity. With the increasing acoustic requirements of the exhaust gas aftertreatment device, the related art usually adopts a method of increasing the volume of the air outlet cavity to improve the acoustic performance.

[0004] However, increasing the volume of the air outlet cavity inevitably leads to an increase in the overall volume of the exhaust gas aftertreatment device, and the structure becomes relatively complex. More importantly, under some application boundaries, when the size of the exhaust gas aftertreatment device has been fixed, it is impossible to improve the noise by increasing the volume of the air outlet cavity. How to reduce the noise without increasing the volume is a technical problem faced by those skilled in the art.

[0005] The related art adopts a method of fixing steel wool in the air outlet pipe to improve the acoustic performance, which achieves excellent results. However, the steel wool in the related art is directly fixed in the air outlet pipe by brazing, which is relatively high in cost. SUMMARY

[0006] The utility model aims to provide an air outlet assembly and an exhaust gas aftertreatment device with improved structure.

[0007] To achieve the above object, the utility model discloses the following technical scheme: a gas outlet assembly for exhaust aftertreatment device, the gas outlet assembly includes the gas pipe, the net element and the porous medium element of installing in the net element, the porous medium element is located in the net element, the net element and the inner wall welding fixed of the gas pipe, the porous medium element does not weld with the inner wall of the gas pipe, the gas pipe is configured to let exhaust flow out the exhaust aftertreatment device, the porous medium element is configured to let the exhaust pass through the porous medium element to reduce the noise of the exhaust.

[0008] As a further improved technical scheme of the utility model, the porous medium element is not welded with the net element.

[0009] As a further improved technical scheme of the utility model, the net element includes a first net end wall and a second net end wall opposite to the first net end wall, and the porous medium element is clamped between the first net end wall and the second net end wall.

[0010] As a further improved technical scheme of the utility model, the net element further includes a first net side wall integrally arranged with the first net end wall, the first net end wall and the first net side wall form a containing space, and the porous medium element is contained in the containing space.

[0011] As a further improved technical scheme of the utility model, the net element further includes a second net side wall integrally arranged with the second net end wall, and the second net end wall and the second net side wall are both contained in the containing space.

[0012] As a further improved technical scheme of the utility model, the net element includes a first net cover and a second net cover, the first net cover and the second net cover are separately arranged, the first net cover includes the first net end wall and the first net side wall, and the second net cover includes the second net end wall and the second net side wall.

[0013] As a further improved technical scheme of the utility model, the first net cover and the second net cover are assembled together, the second net side wall is located inside the first net side wall and is welded and fixed with the first net side wall to keep the porous medium element between the first net end wall and the second net end wall.

[0014] As a further improved technical scheme of the utility model, the net element and the inner wall of the gas pipe are welded and fixed by argon arc welding or carbon dioxide shielded welding.

[0015] As a further improved technical scheme of the utility model, the porous medium element is steel wire wool.

[0016] This utility model also discloses an exhaust aftertreatment device, which includes:

[0017] Outer metal casing;

[0018] An exhaust gas aftertreatment carrier, wherein the exhaust gas aftertreatment carrier is encapsulated in the outer metal housing;

[0019] An intake pipe, said intake pipe being located upstream of the exhaust aftertreatment carrier; and

[0020] An exhaust assembly is located downstream of the exhaust gas aftertreatment carrier, and the exhaust assembly is the aforementioned exhaust assembly.

[0021] Compared to existing technologies, the exhaust assembly and exhaust aftertreatment device of this invention include an exhaust pipe, a mesh element, and a porous media element installed in the mesh element. The porous media element is disposed within the mesh element, and the mesh element is welded and fixed to the inner wall of the exhaust pipe. The porous media element is not welded to the inner wall of the exhaust pipe. By using the porous media element, this invention can reduce low-frequency and high-frequency noise without increasing the volume of the exhaust chamber. Furthermore, by welding the mesh element to the exhaust pipe while the porous media element does not participate in the welding, welding costs are significantly reduced. Attached Figure Description

[0022] Figure 1 This is a perspective view of the exhaust aftertreatment device of this utility model in the first embodiment, wherein the mounting bracket assembly is in the first position.

[0023] Figure 2 yes Figure 1 A partial exploded perspective view, in which the mounting bracket assembly is separated.

[0024] Figure 3 yes Figure 2 Further partial exploded view.

[0025] Figure 4 This is a perspective view of the exhaust aftertreatment device of this utility model in the second embodiment, wherein the mounting bracket assembly is in the second position.

[0026] Figure 5 yes Figure 4 The main view.

[0027] Figure 6 yes Figure 4 A partial exploded perspective view, in which the mounting bracket assembly is separated.

[0028] Figure 7 yes Figure 6Further partial exploded view.

[0029] Figure 8 This is a three-dimensional schematic diagram of the air outlet component of this utility model.

[0030] Figure 9 yes Figure 8 The left view.

[0031] Figure 10 It is along Figure 9 A cross-sectional view of line AA in the middle.

[0032] Figure 11 This is a three-dimensional schematic diagram of the end cap of this utility model.

[0033] Figure 12 yes Figure 11 Top view.

[0034] Figure 13 yes Figure 8 A three-dimensional schematic diagram of the air outlet component in the third embodiment.

[0035] Figure 14 yes Figure 13 Partial exploded 3D diagram.

[0036] Figure 15 yes Figure 13 The left view.

[0037] Figure 16 It is along Figure 15 A cross-sectional view of the BB line.

[0038] Figure 17 yes Figure 16 The image shows a magnified view of a porous dielectric element at one end face, with the vortex angle of the airflow schematically marked.

[0039] Figure 18 yes Figure 16 A cross-sectional view of the fourth embodiment.

[0040] Figure 19 yes Figure 16 A cross-sectional view of the fifth embodiment.

[0041] Figure 20 This is a cross-sectional schematic diagram of the exhaust aftertreatment device of this utility model in the sixth embodiment.

[0042] Figure 21 This is a cross-sectional schematic diagram of the exhaust aftertreatment device of this utility model in the seventh embodiment.

[0043] Figure 22 This is a cross-sectional schematic diagram of the exhaust aftertreatment device of this utility model in the eighth embodiment.

[0044] Figure 23 This is a cross-sectional schematic diagram of the exhaust aftertreatment device of this utility model in the ninth embodiment.

[0045] Figure 24 This is a cross-sectional schematic diagram of the exhaust aftertreatment device of this utility model in the tenth embodiment.

[0046] Figure 25 This is a cross-sectional schematic diagram of the exhaust aftertreatment device of this utility model in the eleventh embodiment.

[0047] Figure 26 This is a cross-sectional schematic diagram of the exhaust aftertreatment device of this utility model in the twelfth embodiment.

[0048] Figure 27 This is a cross-sectional schematic diagram of the exhaust aftertreatment device of this utility model in the thirteenth embodiment.

[0049] Figure 28 yes Figure 27 Partially exploded diagram.

[0050] Figure 29 yes Figure 14 A schematic diagram showing the porous media element installed after the third exhaust pipe section.

[0051] Figure 30 This is a perspective view of the air outlet component of this utility model in another embodiment.

[0052] Figure 31 yes Figure 30 A three-dimensional diagram from another angle.

[0053] Figure 32 yes Figure 31 The right view.

[0054] Figure 33 yes Figure 31 A three-dimensional exploded view. Detailed Implementation

[0055] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Where several specific embodiments exist, features in these embodiments can be combined with each other without conflict. When the description relates to the drawings, unless otherwise stated, the same numbers or symbols in different drawings represent the same or similar elements. The content described in the following exemplary embodiments does not represent all embodiments of this utility model; rather, they are merely examples of products consistent with this utility model and as described in the claims.

[0056] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the scope of protection of this invention. It should be understood that terms such as "first," "second," and similar words used in the specification and claims of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish the features.

[0057] First implementation method:

[0058] Please refer to Figures 1 to 3 As shown, this utility model discloses an exhaust aftertreatment device, which includes an exhaust assembly 10, an exhaust aftertreatment assembly 20 connected to the exhaust assembly 10, an intake assembly 30 connected to the exhaust aftertreatment assembly 20, and a mounting bracket assembly 40 fixed to the exhaust aftertreatment assembly 20. The exhaust assembly 10 includes an exhaust housing 11 and an exhaust pipe assembly 13 connected to the exhaust housing 11.

[0059] The exhaust aftertreatment assembly 20 includes an outer metal housing 21 and an exhaust aftertreatment carrier 22 encapsulated within the outer metal housing 21. The exhaust aftertreatment carrier 22 is at least one of a diesel oxidation catalyst carrier, a diesel particulate filter carrier, and a selective catalytic reduction carrier, or the exhaust aftertreatment carrier 22 is a three-way catalytic converter carrier. The exhaust aftertreatment device is used to treat the exhaust gas from a diesel engine, a natural gas engine, or a gasoline engine. The outer metal housing 21 is connected to the exhaust housing 11.

[0060] The air intake assembly 30 includes an air intake housing 31 and an air intake pipe 32 fixed to the air intake housing 31, wherein the air intake housing 31 is connected to the outer metal housing 21. Preferably, the air intake housing 31 of the air intake assembly 30 and the air outlet housing 11 can share parts.

[0061] The mounting bracket assembly 40 includes a plurality of support frames 41 welded and fixed to the outer metal housing 21, and mounting brackets 42 assembled and fixed to the support frames 41. Please refer to... Figure 1 as well as Figure 4 As shown, the mounting bracket assembly 40 can be installed at different positions along the peripheral wall of the outer metal housing 21.

[0062] Please combine Figures 8 to 12As shown in the illustrated embodiment of this utility model, the vent housing 11 includes a side end wall 111 and a surrounding wall 112 integrally extending axially from the side end wall 111 along the axial direction OO. The surrounding wall 112 has an internal cavity 1120. The side end wall 111 includes a main body portion 1111 and a protrusion 1112 stamped from the main body portion 1111 towards the side away from the internal cavity 1120. The protrusion 1112 extends radially RR, forming a first notch 1113, and the surrounding wall 112 has a second notch 1123. The first notch 1113 and the second notch 1123 together form an opening 113 for inserting the vent pipe assembly 13. In the illustrated embodiment of this utility model, the opening 113 is a circular hole, the first notch 1113 corresponds to a minor arc, and the second notch 1123 corresponds to a major arc. The opening 113 is completely formed on the vent housing 11.

[0063] In the embodiment illustrated in this utility model, the vent assembly 10 includes a flange 114 that protrudes radially (RR) from the surrounding wall 112, the flange 114 corresponding to the second notch 1123. The vent pipe assembly 13 is welded and fixed to the flange 114.

[0064] Each support frame 41 includes a first sidewall 411 welded and fixed to the outer metal housing 21, a second sidewall 412 welded and fixed to the outer metal housing 21, and a mounting wall 413 connecting the first sidewall 411 and the second sidewall 412. The mounting wall 413 is spaced apart from the outer metal housing 21, and the mounting bracket 42 is mounted and fixed to the mounting wall 413 by a first fastener 51.

[0065] In the embodiment illustrated in this utility model, the first fastener 51 includes a first bolt 511 and a first nut 512 that cooperates with the first bolt 511. The first nut 512 is located between the mounting wall 413 and the outer metal housing 21. The first nut 512 is fixed to the mounting wall 413 or detachably assembled with the mounting wall 413.

[0066] In the embodiment illustrated in this utility model, there are two mounting brackets 42 arranged side by side, and the mounting bracket assembly 40 further includes a connecting plate 53 that fixes the two mounting brackets 42 together by a plurality of second fasteners 52.

[0067] The connecting plate 53 includes a first connecting part 531 and a second connecting part 532, wherein the first connecting part 531 is fixedly connected to a mounting bracket 42 by a second fastener 52, and the second connecting part 532 is fixedly connected to another mounting bracket 42 by another second fastener 52.

[0068] Each second fastener 52 includes a second bolt 521 and a second nut 522 that mates with the second bolt 521. The second nut 522 is located between the connecting plate 53 and the outer metal housing 21. The second nut 522 is fixed to the connecting plate 53 or detachably assembled with the connecting plate 53.

[0069] Please combine Figure 10 As shown in the first embodiment illustrated in this utility model, the exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust aftertreatment device. The exhaust pipe 131 extends out of the exhaust housing 11. In the first embodiment illustrated in this utility model, the exhaust pipe 131 includes a first exhaust pipe portion 1311 and a second exhaust pipe portion 1312, the first exhaust pipe portion 1311 and the second exhaust pipe portion 1312 being fixed together (e.g., welded together). The exhaust pipe 131 is provided with a plurality of silencers 1310 penetrating its wall. In the first embodiment illustrated in this utility model, the silencers 1310 are located in the second exhaust pipe portion 1312. Of course, in other embodiments of this utility model, the exhaust pipe 131 may also be a single integral pipe body. In the first embodiment illustrated in this utility model, the vent pipe assembly 13 further includes an outer shell 132 corresponding to the opening area 130 of the vent pipe 131 and sound-absorbing cotton 133 filled between the vent pipe 131 and the outer shell 132. The vent pipe 131 is fixed to the vent housing 11, and the outer shell 132 wraps around the opening area 130 of the vent pipe 131.

[0070] Those skilled in the art will understand that the exhaust pipe 131, whether as a single piece or as a multi-piece connected unit, is applicable to all embodiments of this utility model.

[0071] The exhaust aftertreatment device also includes a connecting piece 6, one end of which is welded and fixed to the outer shell 132, and the other end of which is welded and fixed to the outer metal shell 21 and / or the intake shell 31.

[0072] Each mounting bracket 42 is L-shaped and includes a transverse rod 421 and a longitudinal rod 422 perpendicular to the transverse rod 421.

[0073] The mounting bracket assembly 40 can be installed at different positions along the peripheral wall of the outer metal housing 21 to improve the installation flexibility of the mounting bracket assembly 40.

[0074] In the embodiments illustrated in this utility model, please refer to... Figure 1 As shown, the position includes a first position, in which the transverse rod 421 is at least partially located in the gap between the outer metal housing 21 and the outer housing 132, and the longitudinal rod 422 is located outside the air intake assembly 30.

[0075] In the embodiment illustrated in this utility model, the mounting bracket 42 is a profile with a U-shaped cross-section, which avoids mold opening and thus saves costs.

[0076] The exhaust housing 11 of this invention includes a side end wall 111 and a surrounding wall 112 integrally extending axially from the side end wall 111 along the axial direction OO. The surrounding wall 112 has an internal cavity 1120. The side end wall 111 includes a main body 1111 and a protrusion 1112 stamped from the main body 1111 towards the side away from the internal cavity 1120. The protrusion 1112 extends radially RR and forms a first notch 1113. The surrounding wall 112 has a second notch 1123. The first notch 1113 and the second notch 1123 together form an opening 113 for inserting the exhaust pipe assembly 13. This configuration simplifies the structure and improves reliability by providing the opening 113 on the integrally formed exhaust housing 11; it avoids the challenges to the dimensional accuracy and structural reliability of the opening when forming the opening 113 by welding two parts. For example, it avoids the influence of welding deformation on the opening 113.

[0077] Second implementation method:

[0078] The exhaust aftertreatment device in the second embodiment of the present invention is structurally similar to the exhaust aftertreatment device in the first embodiment of the present invention. The main difference between the two is that, in the second embodiment of the present invention, please refer to... Figures 4 to 7 As shown, the position includes a second position, in which the transverse rod 421 is located on the side of the outer metal housing 21 opposite to the outer housing 132, and the longitudinal rod 422 is located on the outside of the air intake assembly 30.

[0079] Combination Figures 1 to 7As shown, those skilled in the art will understand that the mounting bracket assembly 40 can be installed at different positions along the peripheral wall of the outer metal housing 21, which improves the installation flexibility of the mounting bracket assembly 40 and eliminates the need to design different mounting bracket assemblies 40 for different installation angles, thus saving costs.

[0080] Third implementation method:

[0081] The exhaust aftertreatment device in the third embodiment of this utility model is structurally similar to the exhaust aftertreatment devices in the first and second embodiments of this utility model. The main difference lies in the structure of the exhaust assembly 10. In the third embodiment of this utility model, please refer to... Figures 13 to 17As shown, the exhaust assembly 10 includes an exhaust housing 11 and an exhaust pipe assembly 13 connected to the exhaust housing 11. The exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust aftertreatment device. The exhaust pipe 131 extends out of the exhaust housing 11. In the third embodiment illustrated in this utility model, the exhaust pipe 131 includes a first exhaust pipe portion 1311, a second exhaust pipe portion 1312, and a third exhaust pipe portion 1313. The first exhaust pipe portion 1311 and the second exhaust pipe portion 1312 are fixed together (e.g., welded together). The second exhaust pipe portion 1312 and the third exhaust pipe portion 1313 are fixed together (e.g., welded together). At least one of the first exhaust pipe portion 1311 and the second exhaust pipe portion 1312 is a bend. In the embodiment illustrated in this utility model, the first exhaust pipe portion 1311 is a bend. The vent pipe 131 is provided with a plurality of sound-absorbing holes 1310 penetrating its wall. In the third embodiment illustrated in this utility model, the sound-absorbing holes 1310 are provided in the second vent pipe section 1312. Of course, in other embodiments of this utility model, the vent pipe 131 can also be an integral pipe body. In other words, the first vent pipe section 1311 and the second vent pipe section 1312 are an integral part or two separate parts; the second vent pipe section 1312 and the third vent pipe section 1313 are an integral part or two separate parts. In the third embodiment illustrated in this utility model, the vent pipe assembly 13 further includes an outer shell 132 corresponding to the opening area 130 of the vent pipe 131, sound-absorbing cotton 133 filled between the vent pipe 131 and the outer shell 132, and a porous medium element 134 fixed in the vent pipe 131. In the embodiment illustrated in this utility model, the porous media element 134 is fixed to the third vent pipe portion 1313 to reduce installation difficulty. In the embodiment illustrated in this utility model, the porous media element 134 is welded and fixed to the inner wall of the vent pipe 131. The vent pipe 131 is fixed to the vent housing 11, and the outer housing 132 wraps around the opening area 130 of the vent pipe 131.

[0082] The porous dielectric element 134 can be made of steel wool, mesh steel wire, or ceramic porous dielectric elements, etc. The 3D of the porous dielectric element 134 (e.g., steel wool) is a porous structure or a multi-pore structure. The porous dielectric element 134 is disposed in the exhaust pipe 131 so that the airflow about to flow out of the exhaust aftertreatment device through the exhaust pipe 131 can reduce both low-frequency noise (e.g., 20Hz to 500Hz) and high-frequency noise (e.g., >500Hz) under the action of the porous dielectric element 134, thereby significantly improving the acoustic performance of the exhaust aftertreatment device without increasing the exhaust cavity of the exhaust aftertreatment device.

[0083] Those skilled in the art will understand that the size limitations of exhaust aftertreatment devices in certain applications, such as the significant reduction in size when matched with natural gas engines in commercial vehicles, lead to severe deterioration of low-frequency noise. Simultaneously, the narrow exhaust outlet chamber of the aftertreatment device results in poor high-frequency airflow noise and correspondingly worse insertion loss, ultimately making it difficult to improve acoustic performance within a limited space. A common industry approach is to increase the volume of the exhaust outlet chamber; however, this cannot meet the market demand for smaller sizes.

[0084] To solve the above technical problems, the inventors of this utility model, through extensive research, discovered that using the porous dielectric element 134 can solve both low-frequency and high-frequency noise problems. The mechanism is as follows:

[0085] Mechanism for solving high-frequency noise: When airflow and noise pass through the porous medium element 134, the airflow will be obstructed to a certain extent and the flow rate will be reduced. At the same time, due to the blockage of the porous medium, the airflow can be mixed and flowed more evenly in the outlet pipe 131. This porous medium acts as a rectifier or flow stabilizer, so it is very effective in controlling high-frequency noise.

[0086] Mechanism for solving low-frequency noise: When airflow and noise pass through the porous dielectric element 134, a honeycomb-like structure is formed inside the porous medium (e.g., Figure 29 As shown), it forms many narrow holes and gaps. When airflow passes through these holes and gaps, it generates a large amount of turbulence (such as...). Figure 17 As indicated by the arrow in the diagram, the turbulence can effectively absorb low-frequency noise, thus the porous dielectric element 134 can also significantly reduce low-frequency noise.

[0087] The mechanism by which the porous dielectric element 134 is used to solve low-frequency and high-frequency noise is applicable to all embodiments of this invention that incorporate the porous dielectric element 134.

[0088] The density of the porous dielectric element 134 is ρ, where 0.05 g / cm³. 3 ≤ρ≤10g / cm 3 .

[0089] Preferably, when the porous dielectric element 134 is steel wool or mesh steel wire, the wire diameter of the porous dielectric element 134 is very small (e.g., less than or equal to 1 mm).

[0090] Please combine Figure 16 As shown in the third embodiment illustrated in this utility model, the porous medium element 134 is disposed in the second air outlet section 1312 and is located downstream of the opening region 130 of the second air outlet section 1312.

[0091] Fourth implementation method:

[0092] The exhaust aftertreatment device in the fourth embodiment of this utility model is structurally similar to the exhaust aftertreatment device in the third embodiment of this utility model. The main difference between the two is that in the fourth embodiment of this utility model, please refer to... Figure 18 As shown, the porous medium element 134 is disposed in the first vent pipe 1311 and is located upstream of the second vent pipe 1312.

[0093] Fifth implementation method:

[0094] The exhaust aftertreatment device in the fifth embodiment of this utility model is structurally similar to the exhaust aftertreatment device in the third embodiment of this utility model. The main difference between the two is that in the fifth embodiment of this utility model, please refer to... Figure 19 As shown, the porous medium element 134 is disposed in the second air outlet section 1312, and no sound-absorbing hole 1310 is provided in the second air outlet section 1312; the air outlet assembly 13 also does not have a housing 132 and sound-absorbing cotton 133 filled between the second air outlet section 1312 and the housing 132. Of course, those skilled in the art will understand that the porous medium element 134 can also be disposed in the first air outlet section 1311, and the purpose of this utility model can be achieved in the same way.

[0095] Sixth implementation method:

[0096] Please combine Figure 20 As shown in the figure, the sixth embodiment of the present invention discloses an exhaust aftertreatment device with a different architecture, which includes an intake assembly 30, a mixer assembly 50, an exhaust aftertreatment assembly 20, and an exhaust assembly 10.

[0097] The air intake assembly 30 includes an air intake housing 31 and an air intake pipe 32 fixed to the air intake housing 31.

[0098] The mixer assembly 50 includes a swirling mixer 55 disposed in the air intake housing 31, an airflow guide cone 54 connected to the swirling mixer 55, and a disc mixer 56 located downstream of the airflow guide cone 54.

[0099] The exhaust aftertreatment assembly 20 includes an outer metal housing 21 and an exhaust aftertreatment carrier 22 encapsulated within the outer metal housing 21. The exhaust aftertreatment carrier 22 is at least one of a diesel oxidation catalyst carrier, a diesel particulate filter carrier, and a selective catalytic reduction carrier. The outer metal housing 21 is detachably connected to the intake housing 31.

[0100] The exhaust assembly 10 includes an exhaust pipe assembly 13 and an end cap 14 fixed to one end of the outer metal housing 21. The exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust aftertreatment device and a porous media element 134 fixed in the exhaust pipe 131.

[0101] The porous dielectric element 134 can be made of steel wool, mesh steel wire, or ceramic porous dielectric elements, etc. The 3D of the porous dielectric element 134 (e.g., steel wool) is a porous structure or a multi-pore structure. The porous dielectric element 134 is disposed in the exhaust pipe 131 so that the airflow about to flow out of the exhaust aftertreatment device through the exhaust pipe 131 can reduce both low-frequency noise (e.g., 20Hz to 500Hz) and high-frequency noise (e.g., >500Hz) under the action of the porous dielectric element 134, thereby significantly improving the acoustic performance of the exhaust aftertreatment device without increasing the exhaust cavity of the exhaust aftertreatment device.

[0102] Please combine Figure 20 As shown in the sixth embodiment illustrated in this utility model, the porous dielectric element 134 is located outside the outer metal housing 21 and the end cap 14.

[0103] Seventh implementation method:

[0104] The exhaust aftertreatment device in the seventh embodiment of this utility model is similar in structure to the exhaust aftertreatment device in the sixth embodiment of this utility model. The difference between the two is the position of the porous medium element 134 installed in the exhaust pipe 131.

[0105] Please combine Figure 21As shown in the seventh embodiment illustrated in this utility model, the porous medium element 134 is fixed in the air outlet pipe 131, and the porous medium element 134 is located inside the outer metal shell 21 and inside the end cap 14.

[0106] Eighth implementation method:

[0107] Please combine Figure 22 As shown in the figure, the eighth embodiment of the present invention discloses an exhaust aftertreatment device with a different architecture, which includes an intake assembly 30, a plurality of exhaust aftertreatment assemblies 20, a mixer assembly 50, and an exhaust assembly 10.

[0108] The air intake assembly 30 includes an air intake housing 31 and an air intake pipe 32 fixed to the air intake housing 31. The air intake housing 31 is an air intake cone.

[0109] The plurality of exhaust aftertreatment components 20 include a first exhaust aftertreatment component 201, a second exhaust aftertreatment component 202 located downstream of and connected to the first exhaust aftertreatment component 201, and a third exhaust aftertreatment component 203 located downstream of the second exhaust aftertreatment component 202. A mixer assembly 50 is connected between the second exhaust aftertreatment component 202 and the third exhaust aftertreatment component 203. The intake assembly 30, the first exhaust aftertreatment component 201, the second exhaust aftertreatment component 202, the mixer assembly 50, and the third exhaust aftertreatment component 203 are arranged in a straight line.

[0110] The first exhaust gas aftertreatment assembly 201 includes a first housing 2011 and a diesel oxidation catalyst carrier encapsulated in the first housing 2011.

[0111] The second exhaust aftertreatment assembly 202 includes a second housing 2021 and a diesel particulate filter carrier encapsulated in the second housing 2021.

[0112] The third exhaust gas aftertreatment component 203 includes a third housing 2031 and a selective catalytic reduction carrier encapsulated in the third housing 2031.

[0113] The exhaust assembly 10 includes an exhaust housing 11 and an exhaust pipe assembly 13 connected to the exhaust housing 11. The exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust aftertreatment device and a porous media element 134 fixed in the exhaust pipe 131.

[0114] The porous dielectric element 134 can be made of steel wool, mesh steel wire, or ceramic porous dielectric elements, etc. The 3D of the porous dielectric element 134 (e.g., steel wool) is a porous structure or a multi-pore structure. The porous dielectric element 134 is disposed in the exhaust pipe 131 so that the airflow about to flow out of the exhaust aftertreatment device through the exhaust pipe 131 can reduce both low-frequency noise (e.g., 20Hz to 500Hz) and high-frequency noise (e.g., >500Hz) under the action of the porous dielectric element 134, thereby significantly improving the acoustic performance of the exhaust aftertreatment device without increasing the exhaust cavity of the exhaust aftertreatment device.

[0115] Ninth implementation method:

[0116] Please combine Figure 23 As shown in the figure, the ninth embodiment of the present invention discloses an exhaust aftertreatment device with a different architecture, which includes an intake assembly 30, a plurality of exhaust aftertreatment assemblies 20, a mixer assembly 50, and an exhaust assembly 10.

[0117] The air intake assembly 30 includes an air intake housing 31 and an air intake pipe 32 fixed to the air intake housing 31.

[0118] The plurality of exhaust aftertreatment components 20 include a first exhaust aftertreatment component 201, a second exhaust aftertreatment component 202 located downstream of and connected to the first exhaust aftertreatment component 201, and a third exhaust aftertreatment component 203 located downstream of the second exhaust aftertreatment component 202. A mixer assembly 50 is connected between the second exhaust aftertreatment component 202 and the third exhaust aftertreatment component 203. The exhaust aftertreatment device is generally U-shaped, wherein the first exhaust aftertreatment component 201 and the second exhaust aftertreatment component 202 are arranged in a straight line in a first row, and the third exhaust aftertreatment component 203 is arranged in a straight line in a second row, with the first and second rows parallel to each other. The mixer assembly 50 connects the first and second rows, making the exhaust aftertreatment device generally U-shaped.

[0119] The first exhaust gas aftertreatment assembly 201 includes a first housing 2011 and a diesel oxidation catalyst carrier encapsulated in the first housing 2011.

[0120] The second exhaust aftertreatment assembly 202 includes a second housing 2021 and a diesel particulate filter carrier encapsulated in the second housing 2021.

[0121] The third exhaust gas aftertreatment component 203 includes a third housing 2031 and a selective catalytic reduction carrier encapsulated in the third housing 2031.

[0122] The exhaust assembly 10 includes an exhaust pipe assembly 13 and an end cap 14 fixed to one end of the third housing 2031. The exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust aftertreatment device and a porous media element 134 fixed in the exhaust pipe 131.

[0123] The porous dielectric element 134 can be made of steel wool, mesh steel wire, or ceramic porous dielectric elements, etc. The 3D of the porous dielectric element 134 (e.g., steel wool) is a porous structure or a multi-pore structure. The porous dielectric element 134 is disposed in the exhaust pipe 131 so that the airflow about to flow out of the exhaust aftertreatment device through the exhaust pipe 131 can reduce both low-frequency noise (e.g., 20Hz to 500Hz) and high-frequency noise (e.g., >500Hz) under the action of the porous dielectric element 134, thereby significantly improving the acoustic performance of the exhaust aftertreatment device without increasing the exhaust cavity of the exhaust aftertreatment device.

[0124] Please combine Figure 23 As shown in the ninth embodiment illustrated in this utility model, the porous dielectric element 134 is located outside the third housing 2031 and the end cap 14.

[0125] Tenth implementation method:

[0126] The exhaust aftertreatment device in the tenth embodiment of this utility model is similar in structure to the exhaust aftertreatment device in the ninth embodiment of this utility model. The difference between the two is the position of the porous medium element 134 installed in the exhaust pipe 131.

[0127] Please combine Figure 24 As shown in the tenth embodiment illustrated in this utility model, the porous medium element 134 is fixed in the air outlet pipe 131, and the porous medium element 134 is located inside the third housing 2031 and inside the end cap 14.

[0128] Eleventh implementation method:

[0129] Please combine Figure 25As shown in the figure, the eleventh embodiment of this utility model discloses an exhaust aftertreatment device with a different architecture. The exhaust aftertreatment device is a muffler, which includes an outer metal shell 21 having an inner cavity 29, a first end cap 23 fixed to one end of the outer metal shell 21, a second end cap 24 fixed to the other end of the outer metal shell 21, at least one baffle 25 located in the inner cavity 29 and between the first end cap 23 and the second end cap 24, an intake pipe 32 communicating with the inner cavity 29, and an exhaust pipe assembly 13 communicating with the inner cavity 29.

[0130] The exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust aftertreatment device and a porous media element 134 fixed in the exhaust pipe 131.

[0131] The porous dielectric element 134 can be made of steel wool, mesh steel wire, or ceramic porous dielectric elements, etc. The 3D of the porous dielectric element 134 (e.g., steel wool) is a porous structure or a multi-pore structure. The porous dielectric element 134 is disposed in the exhaust pipe 131 so that the airflow about to flow out of the exhaust aftertreatment device through the exhaust pipe 131 can reduce both low-frequency noise (e.g., 20Hz to 500Hz) and high-frequency noise (e.g., >500Hz) under the action of the porous dielectric element 134, thereby significantly improving the acoustic performance of the exhaust aftertreatment device without increasing the exhaust cavity of the exhaust aftertreatment device.

[0132] Please combine Figure 25 As shown in the eleventh embodiment illustrated in this utility model, the porous dielectric element 134 is located inside the outer metal housing 21 and inside the second end cap 24.

[0133] Twelfth implementation method:

[0134] The exhaust aftertreatment device in the twelfth embodiment of the present invention is similar in structure to the exhaust aftertreatment device in the eleventh embodiment of the present invention, except that the exhaust pipe assembly 13 is different.

[0135] Please combine Figure 26 As shown in the twelfth embodiment illustrated in this utility model, the exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust gas aftertreatment device and a porous media element 134 fixed in the exhaust pipe 131.

[0136] The porous dielectric element 134 can be made of steel wool, mesh steel wire, or ceramic porous dielectric elements, etc. The 3D of the porous dielectric element 134 (e.g., steel wool) is a porous structure or a multi-pore structure. The porous dielectric element 134 is disposed in the exhaust pipe 131 so that the airflow about to flow out of the exhaust aftertreatment device through the exhaust pipe 131 can reduce both low-frequency noise (e.g., 20Hz to 500Hz) and high-frequency noise (e.g., >500Hz) under the action of the porous dielectric element 134, thereby significantly improving the acoustic performance of the exhaust aftertreatment device without increasing the exhaust cavity of the exhaust aftertreatment device.

[0137] Please combine Figure 26 As shown in the twelfth embodiment illustrated in this utility model, the vent pipe 131 extends outward and protrudes from the second end cap 24. The porous media element 134 is located outside the outer metal housing 21 and outside the second end cap 24.

[0138] Specifically, the vent pipe 131 includes a first vent pipe section 1311 and a third vent pipe section 1313, wherein the first vent pipe section 1311 and the third vent pipe section 1313 are an integral part.

[0139] Thirteenth implementation method:

[0140] The exhaust aftertreatment device in the thirteenth embodiment of the present invention is similar in structure to the exhaust aftertreatment device in the twelfth embodiment of the present invention, the difference being the exhaust pipe assembly 13.

[0141] Please combine Figure 27 as well as Figure 28 As shown in the thirteenth embodiment illustrated in this utility model, the exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust gas aftertreatment device and a porous media element 134 fixed in the exhaust pipe 131.

[0142] Specifically, the vent pipe 131 includes a first vent pipe section 1311 and a third vent pipe section 1313. The first vent pipe section 1311 and the third vent pipe section 1313 are two separate parts, which are welded together. The porous media element 134 is fixed in the third vent pipe section 1313 to form a porous media assembly 135. By providing the porous media assembly 135, it is advantageous to fix the porous media element 134 in the third vent pipe section 1313, for example, by welding.

[0143] Please combine Figures 30 to 33As shown, in another embodiment of the exhaust assembly 10 of this utility model, the exhaust assembly 10 includes an exhaust pipe 131, a mesh element 18, and a porous media element 134 installed in the mesh element 18. The mesh element 18 clamps the porous media element 134, and the mesh element 18 is welded and fixed to the inner wall of the exhaust pipe 131. The porous media element 134 is not welded to the inner wall of the exhaust pipe 131. The exhaust pipe 131 is configured to allow exhaust gas to flow out of the exhaust aftertreatment device, and the porous media element 134 is configured to allow the exhaust gas to pass through the porous media element 134 to reduce the noise of the exhaust gas. The porous media element 134 is not welded to the mesh element 18.

[0144] Specifically, in the embodiment illustrated in this utility model, the porous dielectric element 134 does not participate in any welding, thereby reducing welding costs, especially the high manufacturing costs associated with brazing.

[0145] The mesh element 18 includes a first mesh end wall 181 and a second mesh end wall 182 opposite to the first mesh end wall 181, and the porous dielectric element 134 is sandwiched between the first mesh end wall 181 and the second mesh end wall 182. The mesh element 18 also includes a first mesh side wall 183 integrally formed with the first mesh end wall 181, and the first mesh end wall 181 and the first mesh side wall 183 form a receiving space 184, in which the porous dielectric element 134 is received. The mesh element 18 also includes a second mesh side wall 185 integrally formed with the second mesh end wall 182, and both the second mesh end wall 182 and the second mesh side wall 185 are received in the receiving space 184.

[0146] Specifically, in the embodiment illustrated in this utility model, the mesh element 18 includes a first mesh cover 18a and a second mesh cover 18b, which are separately disposed. The first mesh cover 18a includes a first mesh end wall 181 and a first mesh side wall 183, and the second mesh cover 18b includes a second mesh end wall 182 and a second mesh side wall 185. The first mesh cover 18a is a woven mesh or a stretched mesh, for example, made of steel wire. The second mesh cover 18b is a woven mesh or a stretched mesh, for example, made of steel wire.

[0147] The first mesh cover 18a and the second mesh cover 18b are assembled together, wherein the second mesh sidewall 185 is located inside the first mesh sidewall 183 and is welded and fixed to the first mesh sidewall 183 to hold the porous media element 134 between the first mesh endwall 183 and the second mesh endwall 185.

[0148] In some embodiments of this utility model, the mesh element 18 and the inner wall of the air outlet pipe 131 are welded and fixed by argon arc welding or carbon dioxide shielded welding.

[0149] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. The understanding of this specification should be based on those skilled in the art. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present utility model. All technical solutions and improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the claims of the present utility model.

Claims

1. An exhaust assembly for use in an exhaust aftertreatment device, characterized in that, The exhaust assembly includes an exhaust pipe, a mesh element, and a porous media element installed in the mesh element. The porous media element is disposed in the mesh element and welded to the inner wall of the exhaust pipe. The porous media element is not welded to the inner wall of the exhaust pipe. The exhaust pipe is configured to allow exhaust gas to flow out of the exhaust aftertreatment device, and the porous media element is configured to allow the exhaust gas to pass through the porous media element to reduce the noise of the exhaust gas.

2. The air outlet assembly as described in claim 1, characterized in that: The porous dielectric element is not welded to the mesh element.

3. The air outlet assembly as described in claim 1, characterized in that: The mesh element includes a first mesh end wall and a second mesh end wall opposite to the first mesh end wall, and the porous dielectric element is sandwiched between the first mesh end wall and the second mesh end wall.

4. The air outlet assembly as described in claim 3, characterized in that: The mesh element further includes a first mesh sidewall integrally formed with the first mesh endwall, the first mesh endwall and the first mesh sidewall forming a receiving space, and the porous dielectric element is received in the receiving space.

5. The air outlet assembly as described in claim 4, characterized in that: The mesh element also includes a second mesh sidewall integrally formed with the second mesh endwall, and both the second mesh endwall and the second mesh sidewall are housed in the housing space.

6. The air outlet assembly as described in claim 5, characterized in that: The mesh element includes a first mesh cover and a second mesh cover, which are separately disposed. The first mesh cover includes a first mesh end wall and a first mesh side wall, and the second mesh cover includes a second mesh end wall and a second mesh side wall.

7. The air outlet assembly as described in claim 6, characterized in that: The first mesh cover and the second mesh cover are assembled together, wherein the second mesh sidewall is located inside the first mesh sidewall and is welded and fixed to the first mesh sidewall to hold the porous media element between the first mesh endwall and the second mesh endwall.

8. The air outlet assembly as described in claim 1, characterized in that: The mesh element is welded and fixed to the inner wall of the outlet pipe using argon arc welding or carbon dioxide shielded welding.

9. The air outlet assembly as described in claim 1, characterized in that: The porous dielectric element is steel wool.

10. An exhaust aftertreatment device, characterized in that, include: Outer metal casing; An exhaust gas aftertreatment carrier, wherein the exhaust gas aftertreatment carrier is encapsulated in the outer metal housing; An intake pipe, the intake pipe being located upstream of the exhaust gas aftertreatment carrier; as well as An exhaust assembly, located downstream of the exhaust aftertreatment carrier, wherein the exhaust assembly is the exhaust assembly as described in any one of claims 1 to 9.

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