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 invention further discloses an exhaust aftertreatment device comprising the exhaust assembly. Compared with the prior art, according to the invention, the net-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

Background Art

[0002] The exhaust gas aftertreatment device in the related art generally includes an outer housing, an intake pipe, and an 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 the exhaust gas of a diesel engine and the 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 at this time, the exhaust gas aftertreatment device is used to treat the exhaust gas of a gasoline engine.

[0003] Those skilled in the art can understand that the acoustic performance of the exhaust gas aftertreatment device is highly related to the volume of the outlet cavity. With the continuous improvement of the acoustic requirements for the exhaust gas aftertreatment device, the related art usually adopts the method of increasing the volume of the outlet cavity to improve the acoustic performance.

[0004] However, increasing the volume of the outlet cavity will inevitably lead to an increase in the overall volume of the exhaust gas aftertreatment device and a relatively complex structure. 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 outlet cavity. How to reduce the noise without increasing the volume is a technical problem faced by those skilled in the art.

[0005] In the related art, the method of fixing steel wool in the outlet pipe is adopted to improve the acoustic performance, and excellent results have been achieved. However, the steel wool in the related art is directly fixed in the outlet pipe by brazing, and this method has a high cost. Summary of the Invention

[0006] The purpose of the present invention is to provide an outlet assembly and an exhaust gas aftertreatment device with an improved structure.

[0007] To achieve the above purpose, the present invention adopts the following technical solution: An outlet assembly is used on an exhaust gas aftertreatment device. The outlet assembly includes an outlet pipe, a mesh element, and a porous medium element installed in the mesh element. The porous medium element is arranged in the mesh element. The mesh element is welded and fixed to the inner wall of the outlet pipe, and the porous medium element is not welded to the inner wall of the outlet pipe. The outlet pipe is configured to allow the exhaust gas to flow out of the exhaust gas aftertreatment device, and the porous medium element is configured to allow the exhaust gas to pass through the porous medium element to reduce the noise of the exhaust gas.

[0008] As a further improved technical solution of the present invention, the porous medium element is not welded to the mesh element.

[0009] As a further improved technical solution of the present invention, 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 medium element is clamped between the first mesh end wall and the second mesh end wall.

[0010] As a further improved technical solution of the present invention, the mesh element further includes a first mesh side wall integrally provided with the first mesh end wall, and the first mesh end wall and the first mesh side wall form a receiving space, and the porous medium element is received in the receiving space.

[0011] As a further improved technical solution of the present invention, the mesh element further includes a second mesh side wall integrally provided with the second mesh end wall, and both the second mesh end wall and the second mesh side wall are received in the receiving space.

[0012] As a further improved technical solution of the present invention, the mesh element includes a first mesh cover and a second mesh cover, the first mesh cover and the second mesh cover are separately provided, the first mesh cover includes the first mesh end wall and the first mesh side wall, and the second mesh cover includes the second mesh end wall and the second mesh side wall.

[0013] As a further improved technical solution of the present invention, the first mesh cover and the second mesh cover are assembled together, wherein the second mesh side wall is located inside the first mesh side wall and is welded and fixed to the first mesh side wall to hold the porous medium element between the first mesh end wall and the second mesh end wall.

[0014] As a further improved technical solution of the present invention, the mesh element and the inner wall of the exhaust pipe are welded and fixed by argon arc welding or carbon dioxide shielded welding.

[0015] As a further improved technical solution of the present invention, the porous medium element is steel wool.

[0016] The present invention also discloses an exhaust aftertreatment device, which includes:

[0017] An outer metal housing;

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

[0019] An intake pipe located upstream of the exhaust gas aftertreatment carrier; and

[0020] The air outlet assembly is located downstream of the exhaust gas after-treatment carrier, and the air outlet assembly is the aforementioned air outlet assembly.

[0021] Compared with the prior art, the air outlet assembly and the exhaust gas after-treatment device of the present invention include an air outlet pipe, a mesh element, and a porous medium element installed in the mesh element. The porous medium element is arranged in the mesh element, and the mesh 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. By using the porous medium element, the present invention can reduce low-frequency noise and high-frequency noise without increasing the volume of the air outlet cavity; in addition, by welding the mesh element to the air outlet pipe and the porous medium element not participating in the welding, the welding cost is significantly reduced. Description of the Drawings

[0022] Figure 1 is a perspective schematic view of the exhaust gas after-treatment device of the present invention in the first embodiment, wherein the mounting bracket assembly is in the first position.

[0023] Figure 2 is Figure 1 a partial perspective exploded view, wherein the mounting bracket assembly is separated.

[0024] Figure 3 is Figure 2 a further partial perspective exploded view.

[0025] Figure 4 is a perspective schematic view of the exhaust gas after-treatment device of the present invention in the second embodiment, wherein the mounting bracket assembly is in the second position.

[0026] Figure 5 is Figure 4 the front view of.

[0027] Figure 6 is Figure 4 a partial perspective exploded view, wherein the mounting bracket assembly is separated.

[0028] Figure 7 is Figure 6 a further partial perspective exploded view.

[0029] Figure 8 is a perspective schematic view of the air outlet assembly of the present invention.

[0030] Figure 9 is Figure 8 the left view of.

[0031] Figure 10 is along Figure 9 the sectional schematic view taken along line A-A in.

[0032] Figure 11 It is a three-dimensional schematic diagram of the end cover of the present invention.

[0033] Figure 12 It is Figure 11 the top view of

[0034] Figure 13 It is Figure 8 the three-dimensional schematic diagram of the gas outlet assembly in in the third embodiment.

[0035] Figure 14 It is Figure 13 the partial three-dimensional exploded view of

[0036] Figure 15 It is Figure 13 the left view of

[0037] Figure 16 It is a sectional schematic diagram along the B-B line in Figure 15

[0038] Figure 17 It is Figure 16 the partial enlarged view of the porous medium element in on a certain end face, and the vortex angle of the air flow is schematically marked.

[0039] Figure 18 It is Figure 16 the sectional schematic diagram in the fourth embodiment.

[0040] Figure 19 It is Figure 16 the sectional schematic diagram in the fifth embodiment.

[0041] Figure 20 It is the sectional schematic diagram of the exhaust gas after-treatment device of the present invention in the sixth embodiment.

[0042] Figure 21 It is the sectional schematic diagram of the exhaust gas after-treatment device of the present invention in the seventh embodiment.

[0043] Figure 22 It is the sectional schematic diagram of the exhaust gas after-treatment device of the present invention in the eighth embodiment.

[0044] Figure 23 It is the sectional schematic diagram of the exhaust gas after-treatment device of the present invention in the ninth embodiment.

[0045] Figure 24 It is the sectional schematic diagram of the exhaust gas after-treatment device of the present invention in the tenth embodiment.

[0046] Figure 25 It is the sectional schematic diagram of the exhaust gas after-treatment device of the present invention in the eleventh embodiment.

[0047] Figure 26It is a schematic cross-sectional view of the exhaust gas aftertreatment device of the present invention in the twelfth embodiment.

[0048] Figure 27 It is a schematic cross-sectional view of the exhaust gas aftertreatment device of the present invention in the thirteenth embodiment.

[0049] Figure 28 It is Figure 27 a partial exploded view of

[0050] Figure 29 It is Figure 14 a schematic view after the porous medium element in is installed in the third exhaust pipe part.

[0051] Figure 30 It is a three-dimensional schematic view of the gas outlet assembly of the present invention in another embodiment.

[0052] Figure 31 It is Figure 30 a three-dimensional schematic view from another angle.

[0053] Figure 32 It is Figure 31 the right view of

[0054] Figure 33 It is Figure 31 the three-dimensional exploded view of Specific Embodiments

[0055] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings. Among them, if there are several specific embodiments, the features in these embodiments can be combined with each other without conflict. When the description involves the accompanying drawings, unless otherwise specified, the same numbers or symbols in different drawings represent the same or similar elements. The content described in the following exemplary specific embodiments does not represent all embodiments of the present invention. On the contrary, they are only examples of products that are consistent with the present invention as recorded in the claims of the present invention.

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

[0057] First Embodiment:

[0058] Please refer to Figures 1 to 3As shown, the present invention discloses an exhaust aftertreatment device, which includes an air outlet assembly 10, an exhaust gas aftertreatment assembly 20 connected to the air outlet assembly 10, an air inlet assembly 30 connected to the exhaust gas aftertreatment assembly 20, and a mounting bracket assembly 40 fixed on the exhaust gas aftertreatment assembly 20. The air outlet assembly 10 includes an air outlet housing 11 and an air outlet pipe assembly 13 connected to the air outlet housing 11.

[0059] The exhaust gas aftertreatment assembly 20 includes an outer metal housing 21 and an exhaust gas aftertreatment carrier 22 encapsulated in the outer metal housing 21. The exhaust gas 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 gas aftertreatment carrier 22 is a three-way catalytic converter carrier. The exhaust aftertreatment device is used to treat the exhaust gas of a diesel engine, a natural gas engine, or a gasoline engine. The outer metal housing 21 is connected to the air outlet housing 11.

[0060] The air inlet assembly 30 includes an air inlet housing 31 and an air inlet pipe 32 fixed to the air inlet housing 31, wherein the air inlet housing 31 is connected to the outer metal housing 21. Preferably, the air inlet housing 31 of the air inlet 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 a mounting bracket 42 assembled and fixed to the support frames 41. Please refer to Figure 1 and Figure 4 As shown, the mounting bracket assembly 40 can be mounted at different positions along the circumferential wall surface of the outer metal housing 21.

[0062] Please refer to Figures 8 to 12 As shown, in the illustrated embodiment of the present invention, the air outlet housing 11 includes a side end wall 111 and a surrounding wall 112 integrally extending axially along the O-O direction from the side end wall 111. The surrounding wall 112 is provided with an internal cavity 1120. The side end wall 111 includes a main body portion 1111 and a convex portion 1112 stamped from the main body portion 1111 toward the side away from the internal cavity 1120. The convex portion 1112 extends along the R-R direction, the convex portion 1112 forms a first notch 1113, the surrounding wall 112 is provided with a second notch 1123, and the first notch 1113 and the second notch 1123 together form an opening 113 for inserting the air outlet pipe assembly 13. In the illustrated embodiment of the present invention, 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 air outlet housing 11.

[0063] In the illustrated embodiment of the present invention, the air outlet assembly 10 includes a flanging portion 114 that protrudes from the surrounding wall 112 along the radial direction R-R of the surrounding wall 112, and the flanging portion 114 corresponds to the second notch 1123. The air outlet pipe assembly 13 is fixedly welded to the flanging portion 114.

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

[0065] In the illustrated embodiment of the present invention, 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, and the first nut 512 is fixed to the mounting wall 413 or is detachably assembled with the mounting wall 413.

[0066] In the illustrated embodiment of the present invention, 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 portion 531 and a second connecting portion 532. The first connecting portion 531 is fixedly connected to one mounting bracket 42 by a second fastener 52, and the second connecting portion 532 is fixedly connected to the other mounting bracket 42 by another second fastener 52.

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

[0069] Please combine Figure 10As shown, in the first embodiment illustrated in the present invention, the exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust gas aftertreatment device. The exhaust pipe 131 extends and protrudes from the air outlet housing 11. In the first embodiment illustrated in the present invention, the exhaust pipe 131 includes a first exhaust pipe portion 1311 and a second exhaust pipe portion 1312, and the first exhaust pipe portion 1311 and the second exhaust pipe portion 1312 are fixed together (for example, welded together). The exhaust pipe 131 is provided with a plurality of sound absorption holes 1310 penetrating through its wall. In the first embodiment illustrated in the present invention, the sound absorption holes 1310 are provided in the second exhaust pipe portion 1312. Of course, in other embodiments of the present invention, the exhaust pipe 131 may also be an integral pipe body. In the first embodiment illustrated in the present invention, the exhaust pipe assembly 13 further includes an outer housing 132 corresponding to the opening area 130 of the exhaust pipe 131 and sound absorption cotton 133 filled between the exhaust pipe 131 and the outer housing 132. The exhaust pipe 131 is fixed to the air outlet housing 11, and the outer housing 132 wraps around the opening area 130 of the exhaust pipe 131.

[0070] Those skilled in the art can understand that the one-piece integral pipe body or the split pipe body including multiple pieces and connected together of the exhaust pipe 131 is applicable to all embodiments of the present invention.

[0071] The exhaust gas aftertreatment device further includes a connecting piece 6. One end of the connecting piece 6 is welded and fixed to the outer housing 132, and the other end of the connecting piece 6 is welded and fixed to the outer metal housing 21 and / or the intake housing 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 mounted at different positions along the circumferential wall surface of the outer metal housing 21 to improve the mounting flexibility of the mounting bracket assembly 40.

[0074] In the embodiment illustrated in the present invention, please refer to Figure 1 As shown, the positions include a first position. At the first position, at least a part of the transverse rod 421 is located in the gap between the outer metal housing 21 and the outer housing 132, and the longitudinal rod 422 is located outside the intake assembly 30.

[0075] In the embodiment illustrated in the present invention, the mounting bracket 42 is a profile with a square cross-section, which avoids mold opening and thus saves costs.

[0076] The air outlet housing 11 of the present invention includes a side end wall 111 and a surrounding wall 112 integrally extending axially along the O-O direction from the side end wall 111. The surrounding wall 112 is provided with an internal cavity 1120. The side end wall 111 includes a main body portion 1111 and a convex portion 1112 stamped from the main body portion 1111 towards the side away from the internal cavity 1120. The convex portion 1112 extends along the radial direction R-R, and the convex portion 1112 forms a first notch 1113. The surrounding wall 112 is provided with a second notch 1123. The first notch 1113 and the second notch 1123 together form an opening 113 for inserting the air outlet pipe assembly 13. With such a setting, by providing the opening 113 on the integrally formed air outlet housing 11, the structure is simplified and the reliability is improved; the challenges to the dimensional accuracy and structural reliability of the opening caused by welding two components to form the opening 113 are avoided. For example, the influence of welding deformation on the opening 113 is avoided.

[0077] Second Embodiment:

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

[0079] Refer to Figures 1 to 7 As shown, those skilled in the art can understand that the mounting bracket assembly 40 can be mounted at different positions along the circumferential wall surface of the outer metal housing 21, which improves the mounting flexibility of the mounting bracket assembly 40. There is no need to design different mounting bracket assemblies 40 for different mounting angles, saving costs.

[0080] Third Embodiment:

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

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

[0083] Those skilled in the art can understand that due to the volume limitation of the exhaust aftertreatment device in some application scenarios, for example, the volume of the exhaust aftertreatment device decreases significantly when it is matched with a commercial vehicle natural gas engine, which leads to a severe deterioration of the low-frequency noise; at the same time, because the cavity of the outlet cavity of the exhaust aftertreatment device is very narrow, the high-frequency air flow noise is also poor, and the corresponding insertion loss is relatively worse, ultimately making it difficult to improve its acoustic performance in a limited space. The commonly used technical means in the industry is to increase the volume of the outlet cavity. However, this cannot meet the market needs of small volumes.

[0084] To solve the above technical problems, through a large amount of research, the inventor found that by using the porous medium element 134, both the low-frequency noise problem and the high-frequency noise problem can be solved. The mechanism is as follows:

[0085] Mechanism for solving high-frequency noise: When the air flow and noise pass through the porous medium element 134, the air flow will be hindered to a certain extent and the flow velocity will decrease. At the same time, due to the blockage of the porous medium, the air flow can flow more uniformly in the outlet pipe 131. This porous medium plays the role of a rectifier or a flow stabilizer, so it is very effective in controlling high-frequency noise.

[0086] Mechanism for solving low-frequency noise: When the air flow and noise pass through the porous medium element 134, because a structure similar to a honeycomb nest is formed inside the porous medium (as Figure 29 shown), many narrow holes and multiple narrow gaps will be formed inside it. When the air flow passes through these holes and gaps, a large amount of turbulence will be generated (as shown by the arrows in Figure 17 ), and this turbulence can effectively absorb low-frequency noise, so the porous medium element 134 can also significantly reduce low-frequency noise.

[0087] The mechanism of using the porous medium element 134 to solve low-frequency noise and high-frequency noise in the present invention is applicable to all embodiments of the present invention that have the porous medium element 134.

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

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

[0090] Please refer to Figure 16 As shown, in the third embodiment illustrated in the present invention, the porous medium element 134 is disposed in the second air outlet pipe portion 1312 and is located downstream of the opening area 130 of the second air outlet pipe portion 1312.

[0091] Fourth embodiment:

[0092] The exhaust gas post-treatment device in the fourth embodiment illustrated in the present invention is similar in structure to the exhaust gas post-treatment device in the third embodiment illustrated in the present invention. The main difference between the two is that in the fourth embodiment illustrated in the present invention, please refer to Figure 18 As shown, the porous medium element 134 is disposed in the first air outlet pipe portion 1311 and is located upstream of the second air outlet pipe portion 1312.

[0093] Fifth embodiment:

[0094] The exhaust gas post-treatment device in the fifth embodiment illustrated in the present invention is similar in structure to the exhaust gas post-treatment device in the third embodiment illustrated in the present invention. The main difference between the two is that in the fifth embodiment illustrated in the present invention, please refer to Figure 19 As shown, the porous medium element 134 is disposed in the second air outlet pipe portion 1312 and the second air outlet pipe portion 1312 is not provided with sound-absorbing holes 1310; the air outlet pipe assembly 13 is also not provided with an outer shell 132 and sound-absorbing cotton 133 filled between the second air outlet pipe portion 1312 and the outer shell 132. Of course, those skilled in the art can understand that the porous medium element 134 can also be disposed in the first air outlet pipe portion 1311, and the object of the present invention can also be achieved.

[0095] Sixth embodiment:

[0096] Please refer to Figure 20 As shown, the sixth embodiment illustrated in the present invention discloses an exhaust gas post-treatment device with a different architecture, which includes an intake assembly 30, a mixer assembly 50, an exhaust gas post-treatment assembly 20, and an air outlet assembly 10.

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

[0098] The mixer assembly 50 includes a swirl mixer 55 disposed in the intake housing 31, an air flow guiding cone 54 connected to the swirl mixer 55, and a disc-shaped mixer 56 located downstream of the air flow guiding cone 54.

[0099] The exhaust gas aftertreatment assembly 20 includes an outer metal housing 21 and an exhaust gas aftertreatment carrier 22 encapsulated in the outer metal housing 21. The exhaust gas 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 outlet assembly 10 includes an outlet pipe assembly 13 and an end cap 14 fixed to one end of the outer metal housing 21. The outlet pipe assembly 13 includes an outlet pipe 131 for discharging the exhaust gas from the exhaust gas aftertreatment device and a porous medium element 134 fixed in the outlet pipe 131.

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

[0102] Please refer to Figure 20 As shown, in the sixth embodiment illustrated in the present invention, the porous medium element 134 is located outside the outer metal housing 21 and the end cap 14.

[0103] Seventh embodiment:

[0104] The exhaust gas aftertreatment device in the seventh embodiment illustrated in the present invention is similar in structure to the exhaust gas aftertreatment device in the sixth embodiment illustrated in the present invention. The difference between the two lies in the position of the porous medium element 134 installed in the outlet pipe 131.

[0105] Please refer to Figure 21 As shown, in the seventh embodiment illustrated in the present invention, the porous medium element 134 is fixed in the outlet pipe 131, and the porous medium element 134 is located inside the outer metal housing 21 and inside the end cap 14.

[0106] Eighth Embodiment:

[0107] Please refer to Figure 22 As shown, in the eighth embodiment illustrated in the present invention, an exhaust aftertreatment device with a different architecture is disclosed, which includes an intake component 30, a plurality of exhaust gas aftertreatment components 20, a mixer component 50, and an outlet component 10.

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

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

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

[0111] The second exhaust gas aftertreatment component 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 outlet component 10 includes an outlet housing 11 and an outlet pipe assembly 13 connected to the outlet housing 11. The outlet pipe assembly 13 includes an outlet pipe 131 for discharging the exhaust gas from the exhaust aftertreatment device and a porous medium element 134 fixed in the outlet pipe 131.

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

[0115] Ninth Embodiment:

[0116] Please refer to Figure 23 As shown, in the ninth embodiment illustrated in the present invention, an exhaust gas aftertreatment device with a different architecture is disclosed, which includes an intake assembly 30, a plurality of exhaust gas aftertreatment assemblies 20, a mixer assembly 50, and an outlet assembly 10.

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

[0118] The plurality of exhaust gas aftertreatment assemblies 20 includes a first exhaust gas aftertreatment assembly 201, a second exhaust gas aftertreatment assembly 202 located downstream of the first exhaust gas aftertreatment assembly 201 and connected to the first exhaust gas aftertreatment assembly 201, and a third exhaust gas aftertreatment assembly 203 located downstream of the second exhaust gas aftertreatment assembly 202. The mixer assembly 50 is connected between the second exhaust gas aftertreatment assembly 202 and the third exhaust gas aftertreatment assembly 203. The exhaust gas aftertreatment device is generally U-shaped, wherein the first exhaust gas aftertreatment assembly 201 and the second exhaust gas aftertreatment assembly 202 are arranged linearly and located in the first row, the third exhaust gas aftertreatment assembly 203 is arranged linearly and located in the second row, and the first row and the second row are parallel to each other. The mixer assembly 50 connects the first row and the second row, making the exhaust gas aftertreatment device U-shaped as a whole.

[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 gas 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 assembly 203 includes a third housing 2031 and a selective catalytic reduction carrier encapsulated in the third housing 2031.

[0122] The exhaust gas outlet 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 the exhaust gas from the exhaust gas aftertreatment device and a porous medium element 134 fixed in the exhaust pipe 131.

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

[0124] Please refer to Figure 23 As shown, in the ninth embodiment illustrated in the present invention, the porous medium element 134 is located outside the third housing 2031 and the end cap 14.

[0125] Tenth embodiment:

[0126] The exhaust gas aftertreatment device in the tenth embodiment illustrated in the present invention is similar in structure to the exhaust gas aftertreatment device in the ninth embodiment illustrated in the present invention. The difference between the two lies in the position of the porous medium element 134 installed in the exhaust pipe 131.

[0127] Please refer to Figure 24 As shown, in the tenth embodiment illustrated in the present invention, the porous medium element 134 is fixed in the exhaust pipe 131. The porous medium element 134 is located inside the third housing 2031 and inside the end cap 14.

[0128] Eleventh embodiment:

[0129] Please refer to Figure 25As shown, in the eleventh embodiment illustrated in the present invention, an exhaust aftertreatment device with a different architecture is disclosed. The exhaust aftertreatment device is a muffler, which includes an outer metal housing 21 having an inner cavity 29, a first end cap 23 fixed to one end of the outer metal housing 21, a second end cap 24 fixed to the other end of the outer metal housing 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 outlet pipe assembly 13 communicating with the inner cavity 29.

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

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

[0132] Please refer to Figure 25 As shown, in the eleventh embodiment illustrated in the present invention, the porous medium element 134 is located inside the outer metal housing 21 and on the inner side of the second end cap 24.

[0133] Twelfth embodiment:

[0134] The exhaust aftertreatment device in the twelfth embodiment illustrated in the present invention is similar in structure to the exhaust aftertreatment device in the eleventh embodiment illustrated in the present invention, and the difference between the two lies in the outlet pipe assembly 13.

[0135] Please refer to Figure 26 As shown, in the twelfth embodiment illustrated in the present invention, the outlet pipe assembly 13 includes an outlet pipe 131 for discharging the exhaust from the exhaust aftertreatment device and a porous medium element 134 fixed in the outlet pipe 131.

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

[0137] Please refer to Figure 26 As shown, in the twelfth embodiment illustrated in the present invention, the outlet pipe 131 extends outwardly and protrudes from the second end cap 24. The porous medium element 134 is located outside the outer metal housing 21 and on the outer side of the second end cap 24.

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

[0139] Thirteenth Embodiment:

[0140] The exhaust gas after-treatment device in the thirteenth embodiment illustrated in the present invention is similar in structure to the exhaust gas after-treatment device in the twelfth embodiment illustrated in the present invention, and the difference between the two lies in the outlet pipe assembly 13.

[0141] Please refer to Figure 27 and Figure 28 As shown, in the thirteenth embodiment illustrated in the present invention, the outlet pipe assembly 13 includes an outlet pipe 131 for discharging the exhaust gas from the exhaust gas after-treatment device and a porous medium element 134 fixed in the outlet pipe 131.

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

[0143] Please refer to Figures 30 to 33As shown, in another embodiment of the gas outlet assembly 10 of the present invention, the gas outlet assembly 10 includes an outlet pipe 131, a mesh element 18, and a porous medium element 134 installed in the mesh element 18. The mesh element 18 clamps the porous medium element 134, the mesh element 18 is fixedly welded to the inner wall of the outlet pipe 131, and the porous medium element 134 is not welded to the inner wall of the outlet pipe 131. The outlet pipe 131 is configured to allow the exhaust gas to flow out of the exhaust gas after-treatment device, and the porous medium element 134 is configured to allow the exhaust gas to pass through the porous medium element 134 to reduce the noise of the exhaust gas. The porous medium element 134 is not welded to the mesh element 18.

[0144] Specifically, in the illustrated embodiment of the present invention, the porous medium element 134 does not participate in any welding, thereby reducing the welding cost, especially the high manufacturing cost brought by 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 medium element 134 is clamped between the first mesh end wall 181 and the second mesh end wall 182. The mesh element 18 further includes a first mesh side wall 183 integrally provided with the first mesh end wall 181. The first mesh end wall 181 and the first mesh side wall 183 form a receiving space 184, and the porous medium element 134 is received in the receiving space 184. The mesh element 18 further includes a second mesh side wall 185 integrally provided 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 illustrated embodiment of the present invention, the mesh element 18 includes a first mesh cover 18a and a second mesh cover 18b. The first mesh cover 18a and the second mesh cover 18b are separately provided. The first mesh cover 18a includes the first mesh end wall 181 and the first mesh side wall 183, and the second mesh cover 18b includes the second mesh end wall 182 and the 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 side wall 185 is located inside the first mesh side wall 183 and is fixedly welded to the first mesh side wall 183 to hold the porous medium element 134 between the first mesh end wall 183 and the second mesh end wall 185.

[0148] In some embodiments of the present invention, the mesh element 18 is fixedly welded to the inner wall of the air outlet pipe 131 by argon arc welding or carbon dioxide shielded welding.

[0149] The above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. The understanding of this specification should be based on those skilled in the art. Although this specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still modify the present invention or make equivalent replacements, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An air outlet component, which is used on an exhaust gas aftertreatment device, and is characterized in that The exhaust gas outlet assembly includes an exhaust pipe, a mesh element, and a porous medium element installed in the mesh element. The porous medium element is disposed in the mesh element. The mesh element is fixedly welded to the inner wall of the exhaust pipe, and the porous medium element is not welded to the inner wall of the exhaust pipe. The exhaust pipe is configured to allow the exhaust gas to flow out of the exhaust gas aftertreatment device, and the porous medium element is configured to allow the exhaust gas to pass through the porous medium element to reduce the noise of the exhaust gas.

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

3. The air outlet assembly according to 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 medium element is clamped between the first mesh end wall and the second mesh end wall.

4. The air outlet component according to claim 3, wherein: The mesh element further includes a first mesh side wall integrally provided with the first mesh end wall. The first mesh end wall and the first mesh side wall form a receiving space, and the porous medium element is received in the receiving space.

5. The air outlet assembly according to claim 4, wherein: The mesh element further includes a second mesh side wall integrally provided with the second mesh end wall, and both the second mesh end wall and the second mesh side wall are received in the receiving space.

6. The air outlet component according to claim 5, characterized in that: The mesh element includes a first mesh cover and a second mesh cover. The first mesh cover and the second mesh cover are separately provided. The first mesh cover includes the first mesh end wall and the first mesh side wall, and the second mesh cover includes the second mesh end wall and the second mesh side wall.

7. The air outlet assembly according to claim 6, characterized in that: The first mesh cover and the second mesh cover are assembled together, wherein the second mesh side wall is located inside the first mesh side wall and is fixedly welded to the first mesh side wall to hold the porous medium element between the first mesh end wall and the second mesh end wall.

8. The air outlet assembly according to claim 1, characterized in that: The mesh element and the inner wall of the exhaust pipe are fixedly welded by argon arc welding or carbon dioxide shielded welding.

9. The air outlet assembly according to claim 1, characterized in that: The porous medium element is steel wool.

10. An exhaust aftertreatment device, characterized in that, Comprising: An outer metal housing; An exhaust gas aftertreatment carrier encapsulated in the metal housing; An intake pipe located upstream of the exhaust gas aftertreatment carrier; And An exhaust gas outlet assembly located downstream of the exhaust gas aftertreatment carrier, and the exhaust gas outlet assembly is the exhaust gas outlet assembly according to any one of claims 1 to 9.

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