Air outlet assembly and exhaust aftertreatment device

Abstract

An air outlet assembly is used on an exhaust aftertreatment device, the air outlet assembly comprises an air outlet pipe and a porous medium element located in the air outlet pipe, and the air outlet pipe is configured to enable exhaust to flow out of the exhaust aftertreatment device. The porous media element is configured to pass the exhaust gas through the porous media element 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, low-frequency noise and high-frequency noise can be reduced on the premise that the size of the air outlet cavity is not increased.

Description

Background Art

[0002] The exhaust gas aftertreatment device in the related art generally includes an outer shell, an air inlet pipe and an air outlet pipe. In some cases, the exhaust gas aftertreatment device also includes an exhaust gas aftertreatment carrier encapsulated in the outer shell, 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).

[0003] Technicians in the relevant technical field can understand that the acoustic performance of the exhaust after-treatment device is highly related to the volume of the air outlet cavity. As the acoustic requirements of the exhaust after-treatment device continue to increase, the relevant technology usually adopts the 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 will inevitably increase the overall volume of the exhaust aftertreatment device and make the structure relatively complex. More importantly, in some application boundaries, when the size of the exhaust aftertreatment device is fixed, it is impossible to improve the noise by increasing the volume of the air outlet cavity.

[0005] Therefore, how to reduce noise without increasing the volume is a technical problem faced by technicians in the relevant technical field. Utility Model Content

[0006] The utility model aims to provide an air outlet component and an exhaust gas after-treatment device with improved structures so as to reduce noise.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical solution: an air outlet component, used in an exhaust after-treatment device, the air outlet component includes an air outlet pipe and a porous medium element located in the air outlet pipe, the air outlet pipe is configured to allow the exhaust gas to flow out of the exhaust after-treatment 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.

[0008] As a further improved technical solution of the utility model, the porous medium element is welded and fixed on the inner wall of the air outlet pipe.

[0009] As a further improved technical solution of the utility model, the porous medium element is steel wool, and the wire diameter of the steel wool is less than or equal to 1 mm.

[0010] As a further improved technical solution of the utility model, the density of the porous medium element is ρ, where 0.05 g / cm 3 ≤ρ≤10g / cm 3 .

[0011] As a further improved technical solution of the utility model, the porous medium element is a porous medium element of meshed steel wire or ceramic.

[0012] As a further improved technical solution of the utility model, the air outlet pipe includes a first air outlet pipe portion and a second air outlet pipe portion, and the first air outlet pipe portion and the second air outlet pipe portion are an integrated part or two separate parts;

[0013] The first air outlet pipe portion is connected to the second air outlet pipe portion, and the porous medium element is located at the first air outlet pipe portion and / or the second air outlet pipe portion.

[0014] As a further improved technical solution of the utility model, the second air outlet pipe portion includes an opening area, and the opening area is provided with a plurality of silencer holes penetrating through the wall of the second air outlet pipe portion;

[0015] The air outlet pipe assembly further includes an outer shell wrapped around the opening area and sound-absorbing cotton filled between the opening area and the outer shell;

[0016] The porous medium element is located upstream and / or downstream of the open area in the flow direction of the exhaust gas.

[0017] As a further improved technical solution of the utility model, the air outlet pipe includes a first air outlet pipe portion and a third air outlet pipe portion, the first air outlet pipe portion and the third air outlet pipe portion are two separate parts, and the first air outlet pipe portion is connected to the third air outlet pipe portion;

[0018] The porous medium element is fixed to the third air outlet pipe portion to form a porous medium assembly.

[0019] As a further improved technical solution of the utility model, the air outlet assembly includes an air outlet housing and an air outlet pipe assembly connected to the air outlet housing, and the air outlet pipe assembly includes the air outlet pipe and the porous medium element.

[0020] As a further improved technical solution of the utility model, the air outlet assembly includes an air outlet pipe assembly and an end cover, the air outlet pipe assembly includes the air outlet pipe and the porous medium element, the air outlet pipe is fixed to the end cover, and the air outlet pipe is located on the inner side of the end cover or extends out of the end cover.

[0021] The utility model also discloses an exhaust gas aftertreatment device, which comprises:

[0022] outer shell;

[0023] Intake duct; and

[0024] An air outlet component, wherein the air outlet component is the aforementioned air outlet component.

[0025] As a further improved technical solution of the utility model, the air outlet assembly includes an air outlet shell and an air outlet pipe assembly connected to the air outlet shell, the air outlet pipe assembly includes the air outlet pipe and the porous medium element, and the air outlet shell is fixed to the outer shell.

[0026] As a further improved technical solution of the utility model, the exhaust after-treatment device includes an air intake assembly, the air intake assembly includes an air intake shell and the air intake pipe, the air intake shell is fixed to the outer shell, and the air intake shell and the air outlet shell are respectively located on both sides of the outer shell.

[0027] As a further improved technical solution of the present invention, the exhaust after-treatment device includes an exhaust after-treatment carrier encapsulated in the outer shell, the intake pipe is located upstream of the exhaust after-treatment carrier in the flow direction of the exhaust gas, and the outlet pipe is located downstream of the exhaust after-treatment carrier in the flow direction of the exhaust gas.

[0028] As a further improved technical solution of the utility model, the air outlet assembly includes an air outlet pipe assembly and an end cover, the air outlet pipe assembly includes the air outlet pipe and the porous medium element, the air outlet pipe is fixed to the end cover, the end cover is fixed to the outer shell, and the air outlet pipe is located inside the outer shell or extends out of the end cover.

[0029] As a further improved technical solution of the utility model, the exhaust gas after-treatment device includes an air intake component, a first exhaust gas after-treatment component, a second exhaust gas after-treatment component, a mixer component, and a third exhaust gas after-treatment component;

[0030] The air intake assembly, the first exhaust gas post-treatment assembly, the second exhaust gas post-treatment assembly, the mixer assembly, the third exhaust gas post-treatment assembly and the air outlet assembly are connected in sequence in the flow direction of the exhaust gas;

[0031] The first exhaust gas aftertreatment component includes a first housing and a diesel oxidation catalyst carrier encapsulated in the first housing;

[0032] The second exhaust gas after-treatment assembly includes a second housing and a diesel particulate filter carrier encapsulated in the second housing;

[0033] The third exhaust gas after-treatment component includes a third shell and a selective catalytic reduction carrier encapsulated in the third shell;

[0034] The outer shell includes the first shell, the second shell and the third shell;

[0035] The air intake assembly comprises an air intake housing and the air intake pipe, and the air intake housing is fixed to the first housing;

[0036] The air outlet assembly includes an air outlet housing and an air outlet pipe assembly connected to the air outlet housing. The air outlet pipe assembly includes the air outlet pipe and the porous medium element. The air outlet housing is fixed to the third housing.

[0037] As a further improved technical solution of the utility model, the air intake assembly, the first exhaust gas after-treatment assembly, the second exhaust gas after-treatment assembly, the mixer assembly, the third exhaust gas after-treatment assembly and the air outlet assembly are arranged in a straight line.

[0038] As a further improved technical solution of the utility model, the first exhaust gas after-treatment component and the second exhaust gas after-treatment component are arranged in a straight line and are located in the first row;

[0039] The third exhaust gas after-treatment components are arranged in a straight line and located in the second row, and the first row and the second row are parallel to each other;

[0040] The mixer assembly is connected between the second shell and the third shell, so that the exhaust gas after-treatment device is U-shaped as a whole.

[0041] As a further improved technical solution of the utility model, the exhaust gas after-treatment device is a muffler, and the outer shell has an internal cavity;

[0042] The exhaust aftertreatment device comprises a first end cover fixed to one end of the outer shell, a second end cover fixed to the other end of the outer shell, and at least one baffle located in the internal cavity and between the first end cover and the second end cover;

[0043] The air inlet pipe is in communication with the internal cavity;

[0044] The air outlet pipe of the air outlet pipe assembly is communicated with the internal cavity.

[0045] As a further improved technical solution of the utility model, the air outlet pipe is located on the inner side of the second end cover or extends out of the second end cover;

[0046] The porous medium element is located inside the outer shell or outside the outer shell.

[0047] Compared with the prior art, the gas outlet assembly and exhaust aftertreatment device of the utility model include an outlet pipe and a porous medium element located in the outlet pipe, wherein the outlet pipe is configured to allow the exhaust gas to flow out of the exhaust 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. The utility model can reduce low-frequency noise and high-frequency noise without increasing the volume of the gas outlet cavity by pioneering the use of the porous medium element, thereby solving the long-standing but unresolved technical problems in the engine exhaust system and achieving unexpected technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a three-dimensional schematic diagram of the exhaust gas after-treatment device of the utility model in the first embodiment, wherein the mounting bracket assembly is in the first position.

[0049] Figure 2 yes Figure 1 A partially exploded perspective view of the mounting bracket assembly is shown separated.

[0050] Figure 3 yes Figure 2 Further partial exploded view.

[0051] Figure 4 It is a three-dimensional schematic diagram of the exhaust gas after-treatment device of the utility model in the second embodiment, wherein the mounting bracket assembly is in the second position.

[0052] Figure 5 yes Figure 4 main view.

[0053] Figure 6 yes Figure 4 A partially exploded perspective view of the mounting bracket assembly is shown separated.

[0054] Figure 7 yes Figure 6 Further partial exploded view.

[0055] Figure 8 It is a three-dimensional schematic diagram of the gas outlet component of the utility model.

[0056] Fig. 9 yes Figure 8 Left view of .

[0057] Fig.10 is along Fig. 9 Schematic diagram of the cross section along line AA.

[0058] Fig.11 It is a three-dimensional schematic diagram of the end cover of the utility model.

[0059] Fig.12 yes Fig.11 Top view of the .

[0060] Fig.13 yes Figure 8 A three-dimensional schematic diagram of the air outlet component in the third embodiment.

[0061] Fig.14 yes Fig.13 Partial exploded view of the .

[0062] Fig.15 yes Fig.13 Left view of .

[0063] Fig.16 is along Fig.15 Schematic diagram of the cross section along line BB.

[0064] Fig.17 yes Fig.16 A partial enlarged view of a porous medium element at a certain end face, and the swirl angle of the airflow is schematically marked.

[0065] Fig.18 yes Fig.16 A cross-sectional schematic diagram of a fourth embodiment.

[0066] Fig.19 yes Fig.16 A cross-sectional schematic diagram of a fifth embodiment.

[0067] Fig. 20 It is a cross-sectional schematic diagram of the exhaust gas after-treatment device of the utility model in the sixth embodiment.

[0068] Fig.21 It is a cross-sectional schematic diagram of the exhaust gas after-treatment device of the present utility model in the seventh embodiment.

[0069] Fig. 22 It is a cross-sectional schematic diagram of the exhaust gas after-treatment device of the present utility model in the eighth embodiment.

[0070] Fig.23 It is a cross-sectional schematic diagram of the exhaust gas after-treatment device of the utility model in the ninth embodiment.

[0071] Fig.24 It is a cross-sectional schematic diagram of the exhaust gas after-treatment device of the present utility model in the tenth embodiment.

[0072] Fig.25 It is a cross-sectional schematic diagram of the exhaust gas after-treatment device of the present utility model in the eleventh embodiment.

[0073] Fig.26 It is a schematic cross-sectional view of the exhaust gas after-treatment device of the present utility model in the twelfth embodiment.

[0074] Fig. 27 It is a schematic cross-sectional view of the exhaust gas after-treatment device of the present utility model in the thirteenth embodiment.

[0075] Fig.28 yes Fig. 27 Partial exploded view of the .

[0076] Fig.29 yes Fig.14 Schematic diagram of the porous medium element after being installed in the third air outlet pipe part. DETAILED DESCRIPTION

[0077] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. If there are several specific embodiments, the features of these embodiments can be combined with each other without conflict. When the description involves the drawings, unless otherwise specified, the same numbers or symbols in different drawings represent the same or similar elements. The contents described in the following exemplary embodiments do not represent all embodiments of the present invention. On the contrary, they are only examples of products consistent with the present invention as recorded in the claims of the present invention.

[0078] The terms used in the present invention are only for the purpose of describing specific implementations and are not intended to limit the scope of protection of the present invention. It should be understood that the terms such as "first", "second" and similar terms used in the specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish the names of features.

[0079] First embodiment:

[0080] Please refer to Figures 1 to 3 As shown, the utility model discloses an exhaust after-treatment device, which includes an air outlet component 10, an exhaust after-treatment component 20 connected to the air outlet component 10, an air intake component 30 connected to the exhaust after-treatment component 20, and a mounting bracket component 40 fixed to the exhaust after-treatment component 20. The air outlet component 10 includes an air outlet housing 11 and an air outlet pipe component 13 connected to the air outlet housing 11.

[0081] The exhaust gas aftertreatment component 20 includes an outer shell 21 and an exhaust gas aftertreatment carrier 22 encapsulated in the outer shell 21, wherein 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 shell 21 is connected to the gas outlet housing 11.

[0082] 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 housing 21. Preferably, the air intake housing 31 of the air intake assembly 30 and the air outlet housing 11 can share parts.

[0083] The mounting bracket assembly 40 includes a plurality of support brackets 41 welded and fixed to the outer shell 21 and a mounting bracket 42 assembled and fixed to the support brackets 41. Figure 1 as well as Figure 4 As shown, the mounting bracket assembly 40 can be installed at different positions along the peripheral wall surface of the outer shell 21 .

[0084] Please combine Figures 8 to 12 As shown, in the illustrated embodiment of the utility model, the gas outlet housing 11 includes a side end wall 111 and a surrounding wall 112 extending integrally from the side end wall 111 along the axial direction OO. The surrounding wall 112 is provided with an internal cavity 1120. The side end wall 111 includes a main body 1111 and a protrusion 1112 stamped from the main body 1111 to a side away from the internal cavity 1120. The protrusion 1112 extends along the radial direction RR, and the protrusion 1112 forms a first notch 1113, and 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 gas outlet pipe assembly 13. In the illustrated embodiment of the 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 gas outlet housing 11.

[0085] In the illustrated embodiment of the present invention, the air outlet assembly 10 includes a flange portion 114 protruding from the surrounding wall 112 along the radial direction RR, and the flange portion 114 corresponds to the second notch 1123. The air outlet pipe assembly 13 is fixed to the flange portion 114 by welding.

[0086] Each support frame 41 includes a first side wall 411 welded and fixed to the outer shell 21, a second side wall 412 welded and fixed to the outer shell 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 shell 21, and the mounting bracket 42 is mounted and fixed to the mounting wall 413 by a first fastener 51.

[0087] 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, and the first nut 512 is located between the mounting wall 413 and the outer shell 21, and the first nut 512 is fixed to the mounting wall 413 or detachably assembled with the mounting wall 413.

[0088] 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 for fixing the two mounting brackets 42 together through a plurality of second fasteners 52 .

[0089] The connecting plate 53 includes a first connecting portion 531 and a second connecting portion 532 , wherein the first connecting portion 531 is fixedly connected to one mounting bracket 42 via a second fastener 52 , and the second connecting portion 532 is fixedly connected to another mounting bracket 42 via another second fastener 52 .

[0090] Each second fastener 52 includes a second bolt 521 and a second nut 522 matched with the second bolt 521 , the second nut 522 is located between the connecting plate 53 and the outer shell 21 , and the second nut 522 is fixed to the connecting plate 53 or detachably assembled with the connecting plate 53 .

[0091] Please combine Fig.10 As shown, in the first embodiment of the utility model illustrated in the figure, the outlet pipe assembly 13 includes an outlet pipe 131 for discharging exhaust gas from the exhaust aftertreatment device. The outlet pipe 131 extends and protrudes from the outlet housing 11. In the first embodiment of the utility model illustrated in the figure, the outlet pipe 131 includes a first outlet pipe portion 1311 and a second outlet pipe portion 1312, and the first outlet pipe portion 1311 and the second outlet pipe portion 1312 are fixed together (for example, welded together). The outlet pipe 131 is provided with a plurality of silencer holes 1310 that penetrate through its wall. In the first embodiment of the utility model illustrated in the figure, the silencer holes 1310 are provided in the second outlet pipe portion 1312. Of course, in other embodiments of the utility model, the outlet pipe 131 may also be an integral pipe body. In the first embodiment of the utility model, the air outlet pipe assembly 13 further includes an outer shell 132 corresponding to the opening area 130 of the air outlet pipe 131 and a sound-absorbing cotton 133 filled between the air outlet pipe 131 and the outer shell 132. The air outlet pipe 131 is fixed to the air outlet shell 11, and the outer shell 132 is wrapped around the opening area 130 of the air outlet pipe 131.

[0092] Those skilled in the art will appreciate that the one-piece integral pipe body or the multiple-piece split pipe body connected together of the air outlet pipe 131 is applicable to all embodiments of the present invention.

[0093] The exhaust gas aftertreatment device further 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 shell 21 and / or the intake shell 31 .

[0094] Each mounting bracket 42 is L-shaped and includes a transverse rod 421 and a longitudinal rod 422 perpendicular to the transverse rod 421 .

[0095] The mounting bracket assembly 40 can be installed at different positions along the peripheral wall surface of the outer shell 21 to improve the installation flexibility of the mounting bracket assembly 40 .

[0096] In the embodiment of the utility model, please combine Figure 1 As shown, the positions include a first position, in which the transverse rod 421 is at least partially located in the gap between the outer shell 21 and the outer shell 132 , and the longitudinal rod 422 is located outside the air intake assembly 30 .

[0097] In the illustrated embodiment of the present invention, the mounting bracket 42 is a profile with a square cross section, which avoids mold opening and thus saves costs.

[0098] The air outlet housing 11 of the utility model includes a side end wall 111 and a surrounding wall 112 extending integrally from the side end wall 111 along the axial direction OO, the surrounding wall 112 is provided with an internal cavity 1120, the side end wall 111 includes a main body 1111 and a protrusion 1112 stamped from the main body 1111 to a side away from the internal cavity 1120, the protrusion 1112 extends along the radial direction RR, the protrusion 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. In this way, by providing the opening 113 on the integrally formed air outlet housing 11, the structure is simplified and the reliability is improved; the challenges brought about by the dimensional accuracy and structural reliability of the opening when the opening 113 is formed by welding two parts are avoided. For example, the influence of welding deformation on the opening 113 is avoided.

[0099] Second implementation method:

[0100] The exhaust gas after-treatment device in the second embodiment of the present invention is similar in structure to the exhaust gas after-treatment 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 positions include a second position, in which the transverse rod 421 is located on the side of the outer shell 21 opposite to the outer shell 132 , and the longitudinal rod 422 is located on the outside of the air intake assembly 30 .

[0101] Combination Figures 1 to 7 As shown, technicians in the relevant technical field can understand that the mounting bracket assembly 40 can be installed at different positions along the peripheral wall surface of the outer shell 21, which improves the installation flexibility of the mounting bracket assembly 40. It is no longer necessary to design different mounting bracket assemblies 40 for different installation angles, thereby saving costs.

[0102] Third embodiment:

[0103] The exhaust gas after-treatment device in the third embodiment of the present utility model is similar in structure to the exhaust gas after-treatment device in the first and second embodiments of the present utility model. The main difference between the two is the structure of the gas outlet assembly 10. In the third embodiment of the present utility model, please refer to Figures 13 to 17As shown, the gas outlet assembly 10 includes a gas outlet housing 11 and a gas outlet pipe assembly 13 connected to the gas outlet housing 11. The gas outlet pipe assembly 13 includes a gas outlet pipe 131 for discharging exhaust gas from the exhaust aftertreatment device. The gas outlet pipe 131 extends and protrudes from the gas outlet housing 11. In the third embodiment illustrated in the utility model, the gas outlet pipe 131 includes a first gas outlet pipe portion 1311, a second gas outlet pipe portion 1312 and a third gas outlet pipe portion 1313, and the first gas outlet pipe portion 1311 and the second gas outlet pipe portion 1312 are fixed together (for example, welded together). The second gas outlet pipe portion 1312 and the third gas outlet pipe portion 1313 are fixed together (for example, welded together). At least one of the first gas outlet pipe portion 1311 and the second gas outlet pipe portion 1312 is a bent pipe. In the embodiment illustrated in the utility model, the first gas outlet pipe portion 1311 is a bent pipe. The air outlet pipe 131 is provided with a plurality of silencer holes 1310 penetrating through its wall. In the third embodiment illustrated in the utility model, the silencer holes 1310 are provided in the second air outlet pipe portion 1312. Of course, in other embodiments of the utility model, 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 an integral part or two separate parts; the second air outlet pipe portion 1312 and the third air outlet pipe portion 1313 are an integral part or two separate parts. In the third embodiment illustrated in the utility model, the air outlet pipe assembly 13 also includes an outer shell 132 corresponding to the opening area 130 of the air outlet pipe 131, silencer cotton 133 filled between the air outlet pipe 131 and the outer shell 132, and a porous medium element 134 fixed in the air outlet pipe 131. In the illustrated embodiment of the present invention, the porous medium element 134 is fixed to the third air outlet pipe portion 1313 to reduce the difficulty of installation. In the illustrated embodiment of 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.

[0104] The porous medium element 134 may be a porous medium element of steel wool, mesh steel wire, or ceramic, 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 that is about to flow out of the exhaust aftertreatment device through the outlet pipe 131 can reduce both low-frequency noise (e.g., 20 Hz to 500 Hz) and 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.

[0105] Those skilled in the art will understand that the volume of the exhaust aftertreatment device in some application scenarios is limited, for example, the volume of the exhaust aftertreatment device is greatly reduced when it is matched with a natural gas engine of a commercial vehicle, which leads to a serious deterioration of low-frequency noise; at the same time, because the cavity of the exhaust aftertreatment device is very narrow, the high-frequency airflow noise is also poor, and the corresponding insertion loss is relatively worse, which ultimately makes 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 air outlet cavity, however, this cannot meet the market demand for small volumes.

[0106] In order to solve the above technical problems, the inventor has found through extensive research that the porous medium element 134 can solve both the low-frequency noise problem and the high-frequency noise problem. The mechanism is as follows:

[0107] Mechanism for solving high-frequency noise: When the airflow and noise pass through the porous medium element 134, the airflow will be hindered 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 plays the role of a rectifier or stabilizer, so it is very effective in controlling high-frequency noise.

[0108] Mechanism for solving low-frequency noise: When the airflow and noise pass through the porous medium element 134, a honeycomb-like structure (such as Fig.29 As shown in Figure 1, many narrow holes and narrow gaps are formed inside the airflow. When the air flows through these holes and gaps, a large amount of turbulence is generated (such as Fig.17 As shown by the arrow in FIG. 1 , the turbulence can effectively absorb the low-frequency noise, so the porous medium element 134 can also significantly reduce the low-frequency noise.

[0109] The mechanism of the utility model using the porous medium element 134 to solve the low-frequency noise and high-frequency noise is applicable to all embodiments of the utility model that have the porous medium element 134.

[0110] The density of the porous medium element 134 is ρ, where 0.05 g / cm 3 ≤ρ≤10g / cm 3 .

[0111] Preferably, when the porous medium element 134 is steel wool or mesh steel wire, the wire diameter of the porous medium element 134 is very small (for example, less than or equal to 1 mm).

[0112] Please combine Fig.16 As shown, in the third embodiment of 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 .

[0113] Fourth embodiment:

[0114] The exhaust gas after-treatment device in the fourth embodiment of the present utility model is similar in structure to the exhaust gas after-treatment device in the third embodiment of the present utility model. The main difference between the two is that: in the fourth embodiment of the present utility model, please refer to Fig.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 .

[0115] Fifth embodiment:

[0116] The exhaust gas after-treatment device in the fifth embodiment of the present utility model is similar in structure to the exhaust gas after-treatment device in the third embodiment of the present utility model. The main difference between the two is that: in the fifth embodiment of the present utility model, please refer to Fig.19 As shown, the porous medium element 134 is arranged in the second air outlet pipe part 1312, and the second air outlet pipe part 1312 is not provided with a muffler hole 1310; the air outlet pipe assembly 13 is also not provided with an outer shell 132 and a muffler cotton 133 filled between the second air outlet pipe part 1312 and the outer shell 132. Of course, those skilled in the art can understand that the porous medium element 134 can also be arranged in the first air outlet pipe part 1311, and the purpose of the utility model can also be achieved.

[0117] Sixth embodiment:

[0118] Please combine Fig. 20 As shown, the sixth embodiment of the present invention discloses an exhaust gas after-treatment device with a different architecture, which includes an air intake component 30 , a mixer component 50 , an exhaust gas after-treatment component 20 and an exhaust component 10 .

[0119] The air intake assembly 30 includes an air intake housing 31 and an air intake pipe 32 fixed to the air intake housing 31 .

[0120] The mixer assembly 50 includes a swirl mixer 51 disposed in the air intake housing 31 , an airflow guide cone 52 connected to the swirl mixer 51 , and a disc mixer 53 located downstream of the airflow guide cone 52 .

[0121] The exhaust gas aftertreatment component 20 includes an outer shell 21 and an exhaust gas aftertreatment carrier 22 encapsulated in the outer shell 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 shell 21 is detachably connected to the intake housing 31.

[0122] The gas outlet assembly 10 includes a gas outlet pipe assembly 13 and an end cover 14 fixed to one end of the outer shell 21 . The gas outlet pipe assembly 13 includes a gas outlet pipe 131 for discharging exhaust gas from the exhaust aftertreatment device and a porous medium element 134 fixed in the gas outlet pipe 131 .

[0123] The porous medium element 134 may be a porous medium element of steel wool, mesh steel wire, or ceramic, 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 that is about to flow out of the exhaust aftertreatment device through the outlet pipe 131 can reduce both low-frequency noise (e.g., 20 Hz to 500 Hz) and 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.

[0124] Please combine Fig. 20 As shown, in the sixth embodiment of the present utility model, the porous medium element 134 is located outside the outer shell 21 and the end cover 14 .

[0125] Seventh embodiment:

[0126] The exhaust gas after-treatment device in the seventh embodiment of the present invention is similar in structure to the exhaust gas after-treatment device in the sixth embodiment of the present invention. The difference between the two is the position where the porous medium element 134 is installed in the exhaust pipe 131.

[0127] Please combine Fig.21As shown, in the seventh embodiment of the present invention, the porous medium element 134 is fixed in the air outlet pipe 131 , and the porous medium element 134 is located inside the outer shell 21 and inside the end cover 14 .

[0128] Eighth embodiment:

[0129] Please combine Fig. 22 As shown, the eighth embodiment of the present invention discloses an exhaust gas after-treatment device with a different architecture, which includes an intake assembly 30 , a plurality of exhaust gas after-treatment assemblies 20 , a mixer assembly 50 , and an exhaust assembly 10 .

[0130] 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.

[0131] The plurality of exhaust gas after-treatment components 20 include a first exhaust gas after-treatment component 201, a second exhaust gas after-treatment component 202 located downstream of the first exhaust gas after-treatment component 201 and connected to the first exhaust gas after-treatment component 201, and a third exhaust gas after-treatment component 203 located downstream of the second exhaust gas after-treatment component 202. The mixer component 50 is connected between the second exhaust gas after-treatment component 202 and the third exhaust gas after-treatment component 203. The air intake component 30, the first exhaust gas after-treatment component 201, the second exhaust gas after-treatment component 202, the mixer component 50 and the third exhaust gas after-treatment component 203 are arranged in a straight line.

[0132] The first exhaust gas after-treatment component 201 includes a first shell 2011 and a diesel oxidation catalyst carrier encapsulated in the first shell 2011 .

[0133] The second exhaust gas after-treatment component 202 includes a second housing 2021 and a diesel particulate filter carrier encapsulated in the second housing 2021 .

[0134] The third exhaust gas after-treatment component 203 includes a third shell 2031 and a selective catalytic reduction carrier encapsulated in the third shell 2031 .

[0135] The gas outlet assembly 10 includes a gas outlet housing 11 and a gas outlet pipe assembly 13 connected to the gas outlet housing 11. The gas outlet pipe assembly 13 includes a gas outlet pipe 131 for discharging exhaust gas from the exhaust aftertreatment device and a porous medium element 134 fixed in the gas outlet pipe 131.

[0136] The porous medium element 134 may be a porous medium element of steel wool, mesh steel wire, or ceramic, 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 that is about to flow out of the exhaust aftertreatment device through the outlet pipe 131 can reduce both low-frequency noise (e.g., 20 Hz to 500 Hz) and 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.

[0137] Ninth embodiment:

[0138] Please combine Fig.23 As shown, the ninth embodiment of the present invention discloses an exhaust gas after-treatment device with a different architecture, which includes an intake assembly 30 , a plurality of exhaust gas after-treatment assemblies 20 , a mixer assembly 50 , and an exhaust assembly 10 .

[0139] The air intake assembly 30 includes an air intake housing 31 and an air intake pipe 32 fixed to the air intake housing 31 .

[0140] The plurality of exhaust gas after-treatment components 20 include a first exhaust gas after-treatment component 201, a second exhaust gas after-treatment component 202 located downstream of the first exhaust gas after-treatment component 201 and connected to the first exhaust gas after-treatment component 201, and a third exhaust gas after-treatment component 203 located downstream of the second exhaust gas after-treatment component 202. The mixer component 50 is connected between the second exhaust gas after-treatment component 202 and the third exhaust gas after-treatment component 203. The exhaust gas after-treatment device is generally U-shaped, wherein the first exhaust gas after-treatment component 201 and the second exhaust gas after-treatment component 202 are arranged in a straight line and located in the first row, the third exhaust gas after-treatment component 203 is arranged in a straight line and located in the second row, and the first row and the second row are parallel to each other. The mixer component 50 connects the first row and the second row, so that the exhaust gas after-treatment device is U-shaped as a whole.

[0141] The first exhaust gas after-treatment component 201 includes a first shell 2011 and a diesel oxidation catalyst carrier encapsulated in the first shell 2011 .

[0142] The second exhaust gas after-treatment component 202 includes a second housing 2021 and a diesel particulate filter carrier encapsulated in the second housing 2021 .

[0143] The third exhaust gas after-treatment component 203 includes a third shell 2031 and a selective catalytic reduction carrier encapsulated in the third shell 2031 .

[0144] The gas outlet assembly 10 includes a gas outlet pipe assembly 13 and an end cover 14 fixed to one end of the third shell 2031 . The gas outlet pipe assembly 13 includes a gas outlet pipe 131 for discharging exhaust gas from the exhaust aftertreatment device and a porous medium element 134 fixed in the gas outlet pipe 131 .

[0145] The porous medium element 134 may be a porous medium element of steel wool, mesh steel wire, or ceramic, 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 that is about to flow out of the exhaust aftertreatment device through the outlet pipe 131 can reduce both low-frequency noise (e.g., 20 Hz to 500 Hz) and 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.

[0146] Please combine Fig.23 As shown, in the ninth embodiment of the present utility model, the porous medium element 134 is located outside the third shell 2031 and the end cover 14 .

[0147] Tenth embodiment:

[0148] The exhaust gas after-treatment device in the tenth embodiment illustrated in the present invention is similar in structure to the exhaust gas after-treatment device in the ninth embodiment illustrated in the present invention, and the difference between the two lies in the position where the porous medium element 134 is installed in the exhaust pipe 131 .

[0149] Please combine Fig.24 As shown, in the tenth embodiment of the present invention, the porous medium element 134 is fixed in the air outlet pipe 131 , and the porous medium element 134 is located inside the third shell 2031 and on the inner side of the end cover 14 .

[0150] Eleventh embodiment:

[0151] Please combine Fig.25As shown, the eleventh embodiment illustrated in the present invention discloses an exhaust after-treatment device of a different architecture, wherein the exhaust after-treatment device is a muffler, which includes an outer shell 21 having an internal cavity 29, a first end cover 23 fixed to one end of the outer shell 21, a second end cover 24 fixed to the other end of the outer shell 21, at least one baffle 25 located in the internal cavity 29 and between the first end cover 23 and the second end cover 24, an intake pipe 32 connected to the internal cavity 29, and an exhaust pipe assembly 13 connected to the internal cavity 29.

[0152] The exhaust pipe assembly 13 includes an exhaust pipe 131 for exhausting exhaust gas from the exhaust aftertreatment device and a porous medium element 134 fixed in the exhaust pipe 131 .

[0153] The porous medium element 134 may be a porous medium element of steel wool, mesh steel wire, or ceramic, 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 that is about to flow out of the exhaust aftertreatment device through the outlet pipe 131 can reduce both low-frequency noise (e.g., 20 Hz to 500 Hz) and 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.

[0154] Please combine Fig.25 As shown, in the eleventh embodiment of the present invention, the porous medium element 134 is located inside the outer shell 21 and on the inner side of the second end cover 24 .

[0155] Twelfth embodiment:

[0156] The exhaust gas after-treatment device in the twelfth embodiment illustrated in the present invention is similar in structure to the exhaust gas after-treatment device in the eleventh embodiment illustrated in the present invention, and the difference between the two lies in the exhaust pipe assembly 13 .

[0157] Please combine Fig.26 As shown, in the twelfth embodiment of the present utility model, the outlet pipe assembly 13 includes an outlet pipe 131 for discharging exhaust gas from the exhaust after-treatment device and a porous medium element 134 fixed in the outlet pipe 131 .

[0158] The porous medium element 134 may be a porous medium element of steel wool, mesh steel wire, or ceramic, 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 that is about to flow out of the exhaust aftertreatment device through the outlet pipe 131 can reduce both low-frequency noise (e.g., 20 Hz to 500 Hz) and 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.

[0159] Please combine Fig.26 As shown, in the twelfth embodiment of the present invention, the air outlet pipe 131 extends outward and protrudes from the second end cover 24. The porous medium element 134 is located outside the outer shell 21 and outside the second end cover 24.

[0160] Specifically, the air outlet pipe 131 includes a first air outlet pipe portion 1311 and a third air outlet pipe portion 1313 , and the first air outlet pipe portion 1311 and the third air outlet pipe portion 1313 are an integrated part.

[0161] Thirteenth embodiment:

[0162] 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 exhaust pipe assembly 13 .

[0163] Please combine Fig. 27 as well as Fig.28 As shown, in the thirteenth embodiment of the present utility model, the air outlet pipe assembly 13 includes an air outlet pipe 131 for discharging exhaust gas from the exhaust after-treatment device and a porous medium element 134 fixed in the air outlet pipe 131 .

[0164] Specifically, the air outlet pipe 131 includes a first air outlet pipe portion 1311 and a third air outlet pipe portion 1313. The first air outlet pipe portion 1311 and the third air outlet pipe portion 1313 are two separate parts and are welded together. The porous medium element 134 is fixed in the third air outlet pipe portion 1313 to form a porous medium assembly 135. By providing the porous medium assembly 135, it is advantageous to fix the porous medium element 134 in the third air outlet pipe portion 1313, for example, by welding the porous medium element 134 to the third air outlet pipe portion 1313.

[0165] The above embodiments are only used to illustrate the present invention but not to limit the technical solutions described in the present invention. The understanding of this specification should be based on the technicians in the relevant technical field. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that technicians in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An exhaust assembly, used in an exhaust aftertreatment device, characterized in that: The gas outlet assembly includes a gas outlet pipe and a porous medium element located in the gas outlet pipe. The gas outlet pipe is configured to allow exhaust gas to flow out of the exhaust aftertreatment device. The porous medium element is configured to allow the exhaust gas to pass through the porous medium element to reduce noise of the exhaust gas.

2. The gas outlet assembly according to claim 1, characterized in that: The porous medium element is welded and fixed on the inner wall of the air outlet pipe.

3. The gas outlet assembly according to claim 1, characterized in that: The porous medium element is steel wool, and the wire diameter of the steel wool is less than or equal to 1 mm.

4. The gas outlet assembly according to claim 1, characterized in that: The density of the porous medium element is ρ, where 0.05 g / cm 3 ≤ρ≤10g / cm 3 .

5. The gas outlet assembly according to claim 1, characterized in that: The porous medium element is a mesh steel wire or ceramic porous medium element.

6. The gas outlet assembly according to claim 1, characterized in that: The air outlet pipe comprises a first air outlet pipe portion and a second air outlet pipe portion, wherein the first air outlet pipe portion and the second air outlet pipe portion are an integrated part or two separate parts; The first air outlet pipe portion is connected to the second air outlet pipe portion, and the porous medium element is located at the first air outlet pipe portion and / or the second air outlet pipe portion.

7. The gas outlet assembly according to claim 6, characterized in that: The second air outlet pipe portion includes an opening area, and the opening area is provided with a plurality of silencer holes penetrating through the wall of the second air outlet pipe portion; The air outlet pipe assembly further includes an outer shell wrapped around the opening area and sound-absorbing cotton filled between the opening area and the outer shell; The porous medium element is located upstream and / or downstream of the open area in the flow direction of the exhaust gas.

8. The gas outlet assembly according to claim 1, characterized in that: The air outlet pipe comprises a first air outlet pipe portion and a third air outlet pipe portion, wherein the first air outlet pipe portion and the third air outlet pipe portion are two separate parts, and the first air outlet pipe portion is connected to the third air outlet pipe portion; The porous medium element is fixed to the third air outlet pipe portion to form a porous medium assembly.

9. The gas outlet assembly according to claim 1, characterized in that: The air outlet assembly comprises an air outlet housing and an air outlet pipe assembly connected to the air outlet housing, and the air outlet pipe assembly comprises the air outlet pipe and the porous medium element.

10. The gas outlet assembly according to claim 1, characterized in that: The air outlet assembly includes an air outlet pipe assembly and an end cover. The air outlet pipe assembly includes the air outlet pipe and the porous medium element. The air outlet pipe is fixed to the end cover. The air outlet pipe is located on the inner side of the end cover or extends out of the end cover.

11. An exhaust gas aftertreatment device, characterized in that: include: outer shell; Intake pipe; as well as An air outlet component, wherein the air outlet component is the air outlet component as described in any one of claims 1 to 8.

12. The exhaust gas aftertreatment device according to claim 11, characterized in that: The air outlet assembly comprises an air outlet housing and an air outlet pipe assembly connected to the air outlet housing, the air outlet pipe assembly comprises the air outlet pipe and the porous medium element, and the air outlet housing is fixed to the outer housing.

13. The exhaust gas aftertreatment device according to claim 12, characterized in that: The exhaust gas aftertreatment device comprises an air intake assembly, which comprises an air intake housing and the air intake pipe. The air intake housing is fixed to the outer housing, and the air intake housing and the air outlet housing are respectively located on two sides of the outer housing.

14. The exhaust gas aftertreatment device according to claim 11, characterized in that: The exhaust gas aftertreatment device includes an exhaust gas aftertreatment carrier encapsulated in the outer shell, the intake pipe is located upstream of the exhaust gas aftertreatment carrier in the flow direction of the exhaust gas, and the outlet pipe is located downstream of the exhaust gas aftertreatment carrier in the flow direction of the exhaust gas.

15. The exhaust gas aftertreatment device according to claim 11, characterized in that: The air outlet assembly includes an air outlet pipe assembly and an end cover, the air outlet pipe assembly includes the air outlet pipe and the porous medium element, the air outlet pipe is fixed to the end cover, the end cover is fixed to the outer shell, and the air outlet pipe is located inside the outer shell or extends out of the end cover.

16. The exhaust gas aftertreatment device according to claim 11, characterized in that: The exhaust gas after-treatment device comprises an air intake assembly, a first exhaust gas after-treatment assembly, a second exhaust gas after-treatment assembly, a mixer assembly, and a third exhaust gas after-treatment assembly; The air intake assembly, the first exhaust gas post-treatment assembly, the second exhaust gas post-treatment assembly, the mixer assembly, the third exhaust gas post-treatment assembly and the air outlet assembly are connected in sequence in the flow direction of the exhaust gas; The first exhaust gas aftertreatment component includes a first housing and a diesel oxidation catalyst carrier encapsulated in the first housing; The second exhaust gas after-treatment assembly includes a second housing and a diesel particulate filter carrier encapsulated in the second housing; The third exhaust gas after-treatment component includes a third shell and a selective catalytic reduction carrier encapsulated in the third shell; The outer shell includes the first shell, the second shell and the third shell; The air intake assembly comprises an air intake housing and the air intake pipe, and the air intake housing is fixed to the first housing; The air outlet assembly includes an air outlet housing and an air outlet pipe assembly connected to the air outlet housing. The air outlet pipe assembly includes the air outlet pipe and the porous medium element. The air outlet housing is fixed to the third housing.

17. The exhaust gas aftertreatment device according to claim 16, characterized in that: The air intake assembly, the first exhaust gas after-treatment assembly, the second exhaust gas after-treatment assembly, the mixer assembly, the third exhaust gas after-treatment assembly and the air outlet assembly are arranged in a straight line.

18. The exhaust gas aftertreatment device according to claim 16, characterized in that: The first exhaust gas after-treatment component and the second exhaust gas after-treatment component are arranged in a straight line and are located in a first row; The third exhaust gas after-treatment components are arranged in a straight line and located in the second row, and the first row and the second row are parallel to each other; The mixer assembly is connected between the second shell and the third shell, so that the exhaust gas after-treatment device is U-shaped as a whole.

19. The exhaust gas aftertreatment device according to claim 11, characterized in that: The exhaust gas after-treatment device is a muffler, and the outer shell has an internal cavity; The exhaust aftertreatment device comprises a first end cover fixed to one end of the outer shell, a second end cover fixed to the other end of the outer shell, and at least one baffle located in the internal cavity and between the first end cover and the second end cover; The air inlet pipe is in communication with the internal cavity; The air outlet pipe of the air outlet pipe assembly is communicated with the internal cavity.

20. The exhaust gas aftertreatment device according to claim 19, characterized in that: The air outlet pipe is located on the inner side of the second end cover or extends out of the second end cover; The porous medium element is located inside the outer shell or outside the outer shell.

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