Gas outlet assembly and exhaust gas aftertreatment device

Abstract

A gas outlet assembly (10) and an exhaust gas aftertreatment device. The gas outlet assembly (10) comprises a gas outlet pipe (131) and a porous medium element (134) located in the gas outlet pipe (131), wherein the gas outlet pipe (131) is configured to allow exhaust gas to flow out of the exhaust gas aftertreatment device, and the porous medium element (134) is configured to allow the exhaust gas to pass through the porous medium element (134) so as to reduce the noise of the exhaust gas. Compared with the prior art, the gas outlet assembly (10) can reduce low-frequency noise and high-frequency noise without increasing the volume of a gas outlet cavity.

Description

Exhaust assembly and exhaust aftertreatment device

[0001] This application claims priority to Chinese Patent Application No. 202411011969.9, filed on July 26, 2024, entitled "Exhaust Assembly and Exhaust Aftertreatment Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to an exhaust assembly and an exhaust aftertreatment device, belonging to the field of engine exhaust aftertreatment technology. Background Technology

[0003] Exhaust aftertreatment devices in related technologies typically include a housing, an intake pipe, and an exhaust pipe. In some cases, the exhaust aftertreatment device also includes an exhaust aftertreatment carrier encapsulated in the housing, which 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).

[0004] Those skilled in the art will understand that the acoustic performance of the exhaust aftertreatment device is highly related to the volume of the exhaust chamber. As the acoustic requirements of the exhaust aftertreatment device continue to increase, related technologies typically improve acoustic performance by increasing the volume of the exhaust chamber.

[0005] However, increasing the volume of the exhaust chamber inevitably leads to an increase in the overall size of the exhaust aftertreatment device and a relatively complex structure. More importantly, in some application scenarios, when the size of the exhaust aftertreatment device is fixed, it is impossible to improve noise by increasing the volume of the exhaust chamber.

[0006] Therefore, how to reduce noise without increasing the size is a technical challenge faced by technicians in this field.

[0007] Summary of the Invention

[0008] The purpose of this application is to provide an exhaust assembly with an improved structure and an exhaust aftertreatment device to reduce noise.

[0009] To achieve the above objectives, this application adopts the following technical solution: an exhaust assembly for use in an exhaust aftertreatment device, the exhaust assembly including an exhaust pipe and a porous media element located in the exhaust pipe, the exhaust pipe being configured to allow exhaust to flow out of the exhaust aftertreatment device, and the porous media element being configured to allow the exhaust to pass through the porous media element to reduce the noise of the exhaust.

[0010] As a further improvement of this application, the porous medium element is welded and fixed to the inner wall of the gas outlet pipe.

[0011] As a further improvement to the technical solution of this application, the porous dielectric element is steel wool, and the wire diameter of the steel wool is less than or equal to 1 mm.

[0012] As a further improvement of the technical solution of this application, the density of the porous dielectric element is ρ, wherein 0.05g / cm3≤ρ≤10g / cm3.

[0013] As a further improvement to the technical solution of this application, the porous dielectric element is a porous dielectric element of mesh steel wire or ceramic.

[0014] As a further improvement of the technical solution of this application, the vent pipe includes a first vent pipe section and a second vent pipe section, wherein the first vent pipe section and the second vent pipe section are an integral part or two separate parts; the first vent pipe section is connected to the second vent pipe section, and the porous medium element is located in the first vent pipe section and / or the second vent pipe section.

[0015] As a further improvement of the technical solution of this application, the second exhaust pipe includes an opening area, the opening area having a plurality of sound-absorbing holes penetrating the wall of the second exhaust pipe; the exhaust pipe assembly also 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 opening area in the flow direction of the exhaust.

[0016] As a further improvement of the technical solution of this application, the vent pipe includes a first vent pipe section and a third vent pipe section. The first vent pipe section and the third vent pipe section are two separate parts, and the first vent pipe section is connected to the third vent pipe section.

[0017] The porous media element is fixed to the third air outlet section to form a porous media assembly.

[0018] As a further improvement of the technical solution of this application, the gas outlet assembly includes a gas outlet housing and a gas outlet pipe assembly connected to the gas outlet housing, and the gas outlet pipe assembly includes the gas outlet pipe and the porous medium element.

[0019] As a further improvement of the technical solution of this application, the air outlet assembly includes an air outlet pipe assembly and an end cap. The air outlet pipe assembly includes the air outlet pipe and the porous medium element. The air outlet pipe is fixed to the end cap and is located inside the end cap or extends out of the end cap.

[0020] This application also discloses an exhaust aftertreatment device, which includes: a housing; an intake pipe; and an exhaust assembly, wherein the exhaust assembly is the aforementioned exhaust assembly.

[0021] As a further improvement of the technical solution of this application, 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 outer shell.

[0022] As a further improvement of the technical solution of this application, the exhaust aftertreatment device includes an intake assembly, the intake assembly includes an intake housing and an intake pipe, the intake housing is fixed to the outer housing, and the intake housing and the exhaust housing are respectively located on both sides of the outer housing.

[0023] As a further improvement of the technical solution of this application, the exhaust aftertreatment device includes an exhaust aftertreatment carrier encapsulated in the outer casing, the intake pipe is located upstream of the exhaust aftertreatment carrier in the exhaust flow direction, and the exhaust outlet pipe is located downstream of the exhaust aftertreatment carrier in the exhaust flow direction.

[0024] As a further improvement of the technical solution of this application, the air outlet assembly includes an air outlet pipe assembly and an end cap. The air outlet pipe assembly includes the air outlet pipe and the porous medium element. The air outlet pipe is fixed to the end cap, and the end cap is fixed to the outer shell. The air outlet pipe is located inside the outer shell or extends out of the end cap.

[0025] As a further improvement of the technical solution of this application, the exhaust aftertreatment device includes an intake assembly, a first exhaust aftertreatment assembly, a second exhaust aftertreatment assembly, a mixer assembly, and a third exhaust aftertreatment assembly.

[0026] The intake assembly, the first exhaust aftertreatment assembly, the second exhaust aftertreatment assembly, the mixer assembly, the third exhaust aftertreatment assembly, and the exhaust assembly are connected sequentially in the exhaust flow direction.

[0027] The first exhaust gas aftertreatment assembly includes a first housing and a diesel oxidation catalyst carrier encapsulated in the first housing;

[0028] The second exhaust aftertreatment assembly includes a second housing and a diesel particulate filter carrier encapsulated in the second housing;

[0029] The third exhaust gas aftertreatment component includes a third housing and a selective catalytic reduction carrier encapsulated in the third housing;

[0030] The outer casing includes the first casing, the second casing, and the third casing;

[0031] The air intake assembly includes an air intake housing and an air intake pipe, wherein the air intake housing is fixed to the first housing;

[0032] 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.

[0033] As a further improvement of this application, the intake assembly, the first exhaust aftertreatment assembly, the second exhaust aftertreatment assembly, the mixer assembly, the third exhaust aftertreatment assembly, and the exhaust assembly are arranged in a straight line.

[0034] As a further improvement of the technical solution of this application, the first exhaust gas aftertreatment component and the second exhaust gas aftertreatment component are arranged in a straight line and located in the first row;

[0035] The third exhaust gas aftertreatment component is arranged in a straight line and located in the second row, with the first row and the second row being parallel to each other;

[0036] The mixer assembly is connected between the second housing and the third housing, making the exhaust aftertreatment device generally U-shaped.

[0037] As a further improvement to the technical solution of this application, the exhaust aftertreatment device is a muffler, and the outer shell has an internal cavity;

[0038] The exhaust aftertreatment device includes a first end cap fixed to one end of the outer shell, a second end cap fixed to the other end of the outer shell, and at least one baffle located in the internal cavity and between the first end cap and the second end cap.

[0039] The air intake pipe is connected to the internal cavity;

[0040] The vent pipe of the vent pipe assembly is connected to the internal cavity.

[0041] As a further improvement of this application, the air outlet pipe is located inside the second end cover or extends out of the second end cover;

[0042] The porous dielectric element is located inside the housing or outside the housing.

[0043] Compared to existing technologies, the exhaust assembly and exhaust aftertreatment device of this application include an exhaust pipe and a porous media element located within the exhaust pipe. The exhaust pipe is configured to allow exhaust gas to flow out of the exhaust aftertreatment device, and the porous media element is configured to allow the exhaust gas to pass through it to reduce exhaust noise. By pioneering the use of the porous media element, this application can reduce low-frequency and high-frequency noise without increasing the volume of the exhaust chamber, solving a long-standing but unresolved technical problem in engine exhaust systems and achieving unexpected technical results. Attached Figure Description

[0044] Figure 1 is a perspective view of the exhaust aftertreatment device of this application in the first embodiment, wherein the mounting bracket assembly is in the first position;

[0045] Figure 2 is a partial exploded perspective view of Figure 1, wherein the mounting bracket assembly is separated.

[0046] Figure 3 is a further partial exploded three-dimensional view of Figure 2;

[0047] Figure 4 is a perspective view of the exhaust aftertreatment device of this application in a second embodiment, wherein the mounting bracket assembly is in the second position;

[0048] Figure 5 is the front view of Figure 4;

[0049] Figure 6 is a partial exploded perspective view of Figure 4, wherein the mounting bracket assembly is separated.

[0050] Figure 7 is a further partial exploded three-dimensional view of Figure 6;

[0051] Figure 8 is a three-dimensional schematic diagram of the air outlet component of this application;

[0052] Figure 9 is the left view of Figure 8;

[0053] Figure 10 is a cross-sectional view along line AA in Figure 9;

[0054] Figure 11 is a perspective view of the end cap of this application;

[0055] Figure 12 is a top view of Figure 11;

[0056] Figure 13 is a perspective view of the air outlet component in Figure 8 in the third embodiment;

[0057] Figure 14 is a partial exploded three-dimensional view of Figure 13;

[0058] Figure 15 is a left view of Figure 13;

[0059] Figure 16 is a cross-sectional view along line BB in Figure 15;

[0060] Figure 17 is a partial enlarged view of the porous dielectric element in Figure 16 at one end face, and the vortex angle of the airflow is schematically marked.

[0061] Figure 18 is a cross-sectional view of Figure 16 in the fourth embodiment;

[0062] Figure 19 is a cross-sectional schematic diagram of Figure 16 in the fifth embodiment;

[0063] Figure 20 is a cross-sectional schematic diagram of the exhaust aftertreatment device of this application in the sixth embodiment;

[0064] Figure 21 is a cross-sectional schematic diagram of the exhaust aftertreatment device of this application in the seventh embodiment;

[0065] Figure 22 is a cross-sectional schematic diagram of the exhaust aftertreatment device of this application in the eighth embodiment;

[0066] Figure 23 is a cross-sectional schematic diagram of the exhaust aftertreatment device of this application in the ninth embodiment;

[0067] Figure 24 is a cross-sectional schematic diagram of the exhaust aftertreatment device of this application in the tenth embodiment;

[0068] Figure 25 is a cross-sectional schematic diagram of the exhaust aftertreatment device of this application in the eleventh embodiment;

[0069] Figure 26 is a cross-sectional schematic diagram of the exhaust aftertreatment device of this application in the twelfth embodiment;

[0070] Figure 27 is a cross-sectional schematic diagram of the exhaust aftertreatment device of this application in the thirteenth embodiment;

[0071] Figure 28 is a partial exploded view of Figure 27;

[0072] Figure 29 is a schematic diagram of the porous media element in Figure 14 after it is installed in the third outlet pipe section. Detailed Implementation

[0073] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings. Where several specific embodiments exist, features in these embodiments may be combined with each other without conflict. When the description involves the accompanying drawings, unless otherwise stated, the same numbers or symbols in different drawings represent the same or similar elements. The content described in the following exemplary embodiments does not represent all embodiments of this application; rather, they are merely examples of products consistent with this application and as described in the claims.

[0074] The terminology used in this application is for the purpose of describing specific embodiments only and is not intended to limit the scope of protection of this application. It should be understood that the terms such as "first," "second," and similar words used in the specification and claims of this application do not indicate any order, quantity, or importance, but are merely used to distinguish features.

[0075] First Embodiment: Referring to Figures 1 to 3, this application discloses an exhaust aftertreatment device, including an exhaust assembly 10, an exhaust aftertreatment assembly 20 connected to the exhaust assembly 10, an intake assembly 30 connected to the exhaust aftertreatment assembly 20, and a mounting bracket assembly 40 fixed to the exhaust aftertreatment assembly 20. The exhaust assembly 10 includes an exhaust housing 11 and an exhaust pipe assembly 13 connected to the exhaust housing 11.

[0076] The exhaust gas aftertreatment assembly 20 includes a housing 21 and an exhaust gas aftertreatment carrier 22 encapsulated in the 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 housing 21 is connected to the exhaust gas housing 11.

[0077] 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.

[0078] The mounting bracket assembly 40 includes a plurality of support frames 41 welded and fixed to the outer casing 21, and mounting brackets 42 assembled and fixed to the support frames 41. Referring to Figures 1 and 4, the mounting bracket assembly 40 can be installed at different positions along the peripheral wall of the outer casing 21.

[0079] Referring to Figures 8 to 12, in this embodiment, the exhaust housing 11 includes a side end wall 111 and a surrounding wall 112 integrally extending axially from the side end wall 111 along the axial direction OO. The surrounding wall 112 has an internal cavity 1120. The side end wall 111 includes a main body portion 1111 and a protrusion 1112 stamped from the main body portion 1111 towards the side away from the internal cavity 1120. The protrusion 1112 extends radially RR, forming a first notch 1113, and the surrounding wall 112 has a second notch 1123. The first notch 1113 and the second notch 1123 together form an opening 113 for inserting the exhaust pipe assembly 13. In this embodiment, 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 exhaust housing 11.

[0080] In the embodiment illustrated in this application, the vent assembly 10 includes a flange 114 that protrudes radially RR from the surrounding wall 112, the flange 114 corresponding to the second notch 1123. The vent pipe assembly 13 is welded and fixed to the flange 114.

[0081] Each support frame 41 includes a first sidewall 411 welded and fixed to the outer casing 21, a second sidewall 412 welded and fixed to the outer casing 21, and a mounting wall 413 connecting the first sidewall 411 and the second sidewall 412. The mounting wall 413 is spaced apart from the outer casing 21, and the mounting bracket 42 is mounted and fixed to the mounting wall 413 by a first fastener 51.

[0082] In this embodiment, 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 casing 21. The first nut 512 is fixed to the mounting wall 413 or detachably assembled with the mounting wall 413.

[0083] In this embodiment, 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.

[0084] The connecting plate 53 includes a first connecting part 531 and a second connecting part 532, wherein the first connecting part 531 is fixedly connected to a mounting bracket 42 by a second fastener 52, and the second connecting part 532 is fixedly connected to another mounting bracket 42 by another second fastener 52.

[0085] Each second fastener 52 includes a second bolt 521 and a second nut 522 that mates with the second bolt 521. The second nut 522 is located between the connecting plate 53 and the housing 21. The second nut 522 is fixed to the connecting plate 53 or detachably assembled with the connecting plate 53.

[0086] Referring to Figure 10, in the first embodiment illustrated in this application, the exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust aftertreatment device. The exhaust pipe 131 extends out of the exhaust housing 11. In the first embodiment illustrated in this application, the exhaust pipe 131 includes a first exhaust pipe portion 1311 and a second exhaust pipe portion 1312, which are fixed together (e.g., welded together). The exhaust pipe 131 is provided with a plurality of silencers 1310 penetrating its wall. In the first embodiment illustrated in this application, the silencers 1310 are located in the second exhaust pipe portion 1312. Of course, in other embodiments of this application, the exhaust pipe 131 may also be a single integral pipe body. In the first embodiment illustrated in this application, the vent pipe assembly 13 further includes an outer housing 132 corresponding to the opening area 130 of the vent pipe 131 and sound-absorbing cotton 133 filled between the vent pipe 131 and the outer housing 132. The vent pipe 131 is fixed to the vent housing 11, and the outer housing 132 wraps around the opening area 130 of the vent pipe 131.

[0087] Those skilled in the art will understand that the exhaust pipe 131, whether as a single piece or as a multi-piece connected unit, is applicable to all embodiments of this application.

[0088] The exhaust aftertreatment device also includes a connecting piece 6, one end of which is welded and fixed to the outer shell 132, and the other end of which is welded and fixed to the outer shell 21 and / or the intake shell 31.

[0089] Each mounting bracket 42 is L-shaped and includes a transverse rod 421 and a longitudinal rod 422 perpendicular to the transverse rod 421. The mounting bracket assembly 40 can be installed in different positions along the peripheral wall of the housing 21 to improve the installation flexibility of the mounting bracket assembly 40.

[0090] In the embodiments illustrated in this application, referring to Figure 1, the position includes a first position, in which the transverse rod 421 is at least partially located in the gap between the outer casing 21 and the outer casing 132, and the longitudinal rod 422 is located outside the air intake assembly 30.

[0091] In the embodiment illustrated in this application, the mounting bracket 42 is a profile with a U-shaped cross-section, which avoids the need for mold making and thus saves costs.

[0092] The exhaust housing 11 of this application includes a side end wall 111 and a surrounding wall 112 integrally extending axially from the side end wall 111 along the axial direction OO. The surrounding wall 112 has an internal cavity 1120. The side end wall 111 includes a main body 1111 and a protrusion 1112 stamped from the main body 1111 toward the side away from the internal cavity 1120. The protrusion 1112 extends radially RR and forms a first notch 1113. The surrounding wall 112 has a second notch 1123. The first notch 1113 and the second notch 1123 together form an opening 113 for inserting the exhaust pipe assembly 13. This configuration simplifies the structure and improves reliability by providing the opening 113 on the integrally formed exhaust housing 11; it avoids the challenges to the dimensional accuracy and structural reliability of the opening when forming the opening 113 by welding two parts. For example, it avoids the influence of welding deformation on the opening 113.

[0093] Second embodiment: The exhaust aftertreatment device in the second embodiment of this application is similar in structure to the exhaust aftertreatment device in the first embodiment of this application. The main difference between the two is that, in the second embodiment of this application, as shown in Figures 4 to 7, the position includes a second position. At the second position, the transverse rod 421 is located on the side of the housing 21 opposite to the housing 132, and the longitudinal rod 422 is located outside the intake assembly 30.

[0094] Referring to Figures 1 to 7, those skilled in the art will understand that the mounting bracket assembly 40 can be installed at different positions along the peripheral wall of the housing 21, improving the installation flexibility of the mounting bracket assembly 40 and eliminating the need to design different mounting bracket assemblies 40 for different installation angles, thus saving costs.

[0095] Third Embodiment: The exhaust aftertreatment device in the third embodiment illustrated in this application is structurally similar to the exhaust aftertreatment devices in the first and second embodiments illustrated in this application. The main difference lies in the structure of the exhaust assembly 10. In the third embodiment illustrated in this application, referring to Figures 13 to 17, the exhaust assembly 10 includes an exhaust housing 11 and an exhaust pipe assembly 13 connected to the exhaust housing 11. The exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust aftertreatment device. The exhaust pipe 131 extends out of the exhaust housing 11. In the third embodiment illustrated in this application, the exhaust pipe 131 includes a first exhaust pipe section 1311, a second exhaust pipe section 1312, and a third exhaust pipe section 1313. The first exhaust pipe section 1311 and the second exhaust pipe section 1312 are fixed together (e.g., welded together). The second exhaust pipe section 1312 and the third exhaust pipe section 1313 are fixed together (e.g., welded together). At least one of the first vent pipe section 1311 and the second vent pipe section 1312 is a bend. In the embodiment illustrated in this application, the first vent pipe section 1311 is a bend. The vent pipe 131 is provided with a plurality of silencers 1310 penetrating its wall. In the third embodiment illustrated in this application, the silencers 1310 are provided in the second vent pipe section 1312. Of course, in other embodiments of this application, the vent pipe 131 can also be a single integral pipe body. In other words, the first vent pipe section 1311 and the second vent pipe section 1312 are a single integral part or two separate parts; the second vent pipe section 1312 and the third vent pipe section 1313 are a single integral part or two separate parts. In the third embodiment illustrated in this application, the vent pipe assembly 13 further includes an outer shell 132 corresponding to the opening area 130 of the vent pipe 131, sound-absorbing cotton 133 filled between the vent pipe 131 and the outer shell 132, and a porous media element 134 fixed in the vent pipe 131. In the embodiment illustrated in this application, the porous media element 134 is fixed to the third vent pipe portion 1313 to reduce installation difficulty. In the embodiment illustrated in this application, the porous media element 134 is welded and fixed to the inner wall of the vent pipe 131. The vent pipe 131 is fixed to the vent housing 11, and the outer shell 132 wraps around the opening area 130 of the vent pipe 131.

[0096] The porous dielectric element 134 can be made of steel wool, mesh steel wire, or ceramic porous dielectric elements, etc. The 3D of the porous dielectric element 134 (e.g., steel wool) is a porous structure or a multi-pore structure. The porous dielectric element 134 is disposed in the exhaust pipe 131 so that the airflow about to flow out of the exhaust aftertreatment device through the exhaust pipe 131 can reduce both low-frequency noise (e.g., 20Hz to 500Hz) and high-frequency noise (e.g., >500Hz) under the action of the porous dielectric element 134, thereby significantly improving the acoustic performance of the exhaust aftertreatment device without increasing the exhaust cavity of the exhaust aftertreatment device.

[0097] Those skilled in the art will understand that the size limitations of exhaust aftertreatment devices in certain applications, such as the significant reduction in size when matched with natural gas engines in commercial vehicles, lead to severe deterioration of low-frequency noise. Simultaneously, the narrow exhaust outlet chamber of the aftertreatment device results in poor high-frequency airflow noise and correspondingly worse insertion loss, ultimately making it difficult to improve acoustic performance within a limited space. A common industry approach is to increase the volume of the exhaust outlet chamber; however, this cannot meet the market demand for smaller sizes.

[0098] To solve the above technical problems, the inventors, through extensive research, discovered that using the porous dielectric element 134 can solve both low-frequency and high-frequency noise problems. The mechanism is as follows:

[0099] Mechanism for solving high-frequency noise: When airflow and noise pass through the porous medium element 134, the airflow will be obstructed to a certain extent and the flow rate will be reduced. At the same time, due to the blockage of the porous medium, the airflow can be mixed and flowed more evenly in the outlet pipe 131. This porous medium acts as a rectifier or flow stabilizer, so it is very effective in controlling high-frequency noise.

[0100] Mechanism for addressing low-frequency noise: When airflow and noise pass through the porous dielectric element 134, a honeycomb-like structure forms inside the porous medium (as shown in Figure 29), creating numerous narrow pores and gaps. As the airflow passes through these pores and gaps, a large amount of turbulence is generated (as indicated by the arrows in Figure 17). This turbulence effectively absorbs low-frequency noise, thus the porous dielectric element 134 can significantly reduce low-frequency noise.

[0101] The mechanism by which the porous dielectric element 134 is used to solve low-frequency and high-frequency noise is applicable to all embodiments of this application that include the porous dielectric element 134.

[0102] The density of the porous dielectric element 134 is ρ, where 0.05 g / cm3 ≤ ρ ≤ 10 g / cm3.

[0103] Preferably, when the porous dielectric element 134 is steel wool or mesh steel wire, the wire diameter of the porous dielectric element 134 is very small (e.g., less than or equal to 1 mm).

[0104] Referring to Figure 16, in the third embodiment of this application, the porous medium element 134 is disposed in the second vent pipe portion 1312 and is located downstream of the opening region 130 of the second vent pipe portion 1312.

[0105] Fourth Embodiment: The exhaust aftertreatment device in the fourth embodiment illustrated in this application is similar in structure to the exhaust aftertreatment device in the third embodiment illustrated in this application. The main difference between the two is that, in the fourth embodiment illustrated in this application, as shown in FIG18, the porous medium element 134 is disposed in the first exhaust pipe 1311 and is located upstream of the second exhaust pipe 1312.

[0106] Fifth Embodiment: The exhaust aftertreatment device in the fifth embodiment illustrated in this application is structurally similar to the exhaust aftertreatment device in the third embodiment illustrated in this application. The main difference is that, in the fifth embodiment illustrated in this application, as shown in Figure 19, the porous medium element 134 is disposed in the second exhaust pipe portion 1312, and no silencing hole 1310 is provided in the second exhaust pipe portion 1312; the exhaust pipe assembly 13 also does not have a housing 132 and silencing cotton 133 filled between the second exhaust pipe portion 1312 and the housing 132. Of course, those skilled in the art will understand that the porous medium element 134 can also be disposed in the first exhaust pipe portion 1311, and the purpose of this application can be achieved in the same way.

[0107] Sixth Embodiment: Referring to FIG20, the sixth embodiment illustrated in this application discloses an exhaust aftertreatment device with a different architecture, which includes an intake assembly 30, a mixer assembly 50, an exhaust aftertreatment assembly 20, and an exhaust assembly 10.

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

[0109] The mixer assembly 50 includes a swirling mixer 51 disposed in the air intake housing 31, an airflow guide cone 52 connected to the swirling mixer 51, and a disc mixer 53 located downstream of the airflow guide cone 52.

[0110] The exhaust aftertreatment assembly 20 includes a housing 21 and an exhaust aftertreatment carrier 22 encapsulated within the housing 21. The exhaust aftertreatment carrier 22 is at least one of a diesel oxidation catalyst carrier, a diesel particulate filter carrier, and a selective catalytic reduction carrier. The housing 21 is detachably connected to the intake housing 31.

[0111] The exhaust assembly 10 includes an exhaust pipe assembly 13 and an end cap 14 fixed to one end of the housing 21. The exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust aftertreatment device and a porous media element 134 fixed in the exhaust pipe 131.

[0112] The porous dielectric element 134 can be made of steel wool, mesh steel wire, or ceramic porous dielectric elements, etc. The 3D of the porous dielectric element 134 (e.g., steel wool) is a porous structure or a multi-pore structure. The porous dielectric element 134 is disposed in the exhaust pipe 131 so that the airflow about to flow out of the exhaust aftertreatment device through the exhaust pipe 131 can reduce both low-frequency noise (e.g., 20Hz to 500Hz) and high-frequency noise (e.g., >500Hz) under the action of the porous dielectric element 134, thereby significantly improving the acoustic performance of the exhaust aftertreatment device without increasing the exhaust cavity of the exhaust aftertreatment device.

[0113] Referring to Figure 20, in the sixth embodiment illustrated in this application, the porous dielectric element 134 is located outside the housing 21 and the end cap 14.

[0114] Seventh Embodiment: The exhaust aftertreatment device in the seventh embodiment illustrated in this application is similar in structure to the exhaust aftertreatment device in the sixth embodiment illustrated in this application. The difference between the two is the position of the porous medium element 134 installed in the exhaust pipe 131.

[0115] Referring to Figure 21, in the seventh embodiment illustrated in this application, 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 cap 14.

[0116] Eighth Embodiment: Referring to FIG22, the eighth embodiment illustrated in this application discloses an exhaust aftertreatment device with a different architecture, which includes an intake assembly 30, a plurality of exhaust aftertreatment assemblies 20, a mixer assembly 50, and an exhaust assembly 10.

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

[0118] The plurality of exhaust aftertreatment components 20 include a first exhaust aftertreatment component 201, a second exhaust aftertreatment component 202 located downstream of and connected to the first exhaust aftertreatment component 201, and a third exhaust aftertreatment component 203 located downstream of the second exhaust aftertreatment component 202. A mixer assembly 50 is connected between the second exhaust aftertreatment component 202 and the third exhaust aftertreatment component 203. The intake assembly 30, the first exhaust aftertreatment component 201, the second exhaust aftertreatment component 202, the mixer assembly 50, and the third exhaust aftertreatment component 203 are arranged in a straight line.

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

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

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

[0122] The exhaust assembly 10 includes an exhaust housing 11 and an exhaust pipe assembly 13 connected to the exhaust housing 11. The exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust aftertreatment device and a porous media element 134 fixed in the exhaust pipe 131.

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

[0124] Ninth implementation method:

[0125] Referring to Figure 23, the ninth embodiment illustrated in this application discloses an exhaust aftertreatment device with a different architecture, which includes an intake assembly 30, a plurality of exhaust aftertreatment assemblies 20, a mixer assembly 50, and an exhaust assembly 10.

[0126] The air intake assembly 30 includes an air intake housing 31 and an air intake pipe 32 fixed to the air intake housing 31.

[0127] The plurality of exhaust aftertreatment components 20 include a first exhaust aftertreatment component 201, a second exhaust aftertreatment component 202 located downstream of and connected to the first exhaust aftertreatment component 201, and a third exhaust aftertreatment component 203 located downstream of the second exhaust aftertreatment component 202. A mixer assembly 50 is connected between the second exhaust aftertreatment component 202 and the third exhaust aftertreatment component 203. The exhaust aftertreatment device is generally U-shaped, wherein the first exhaust aftertreatment component 201 and the second exhaust aftertreatment component 202 are arranged in a straight line in a first row, and the third exhaust aftertreatment component 203 is arranged in a straight line in a second row, with the first and second rows parallel to each other. The mixer assembly 50 connects the first and second rows, making the exhaust aftertreatment device generally U-shaped.

[0128] The first exhaust gas aftertreatment assembly 201 includes a first housing 2011 and a diesel oxidation catalyst carrier encapsulated in the first housing 2011.

[0129] The second exhaust aftertreatment assembly 202 includes a second housing 2021 and a diesel particulate filter carrier encapsulated in the second housing 2021.

[0130] The third exhaust gas aftertreatment component 203 includes a third housing 2031 and a selective catalytic reduction carrier encapsulated in the third housing 2031.

[0131] The exhaust assembly 10 includes an exhaust pipe assembly 13 and an end cap 14 fixed to one end of the third housing 2031. The exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust aftertreatment device and a porous media element 134 fixed in the exhaust pipe 131.

[0132] The porous dielectric element 134 can be made of steel wool, mesh steel wire, or ceramic porous dielectric elements, etc. The 3D of the porous dielectric element 134 (e.g., steel wool) is a porous structure or a multi-pore structure. The porous dielectric element 134 is disposed in the exhaust pipe 131 so that the airflow about to flow out of the exhaust aftertreatment device through the exhaust pipe 131 can reduce both low-frequency noise (e.g., 20Hz to 500Hz) and high-frequency noise (e.g., >500Hz) under the action of the porous dielectric element 134, thereby significantly improving the acoustic performance of the exhaust aftertreatment device without increasing the exhaust cavity of the exhaust aftertreatment device.

[0133] Referring to Figure 23, in the ninth embodiment illustrated in this application, the porous dielectric element 134 is located outside the third housing 2031 and the end cap 14.

[0134] Tenth implementation method:

[0135] The exhaust aftertreatment device in the tenth embodiment illustrated in this application is structurally similar to the exhaust aftertreatment device in the ninth embodiment illustrated in this application. The difference between the two lies in the position of the porous medium element 134 installed in the exhaust pipe 131.

[0136] Referring to Figure 24, in the tenth embodiment illustrated in this application, the porous medium element 134 is fixed in the air outlet pipe 131, and the porous medium element 134 is located inside the third housing 2031 and inside the end cap 14.

[0137] Eleventh implementation method:

[0138] Referring to Figure 25, the eleventh embodiment illustrated in this application discloses an exhaust aftertreatment device with a different architecture. The exhaust aftertreatment device is a muffler, which includes an outer shell 21 having an internal cavity 29, a first end cap 23 fixed to one end of the outer shell 21, a second end cap 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 cap 23 and the second end cap 24, an intake pipe 32 communicating with the internal cavity 29, and an exhaust pipe assembly 13 communicating with the internal cavity 29.

[0139] The exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust aftertreatment device and a porous media element 134 fixed in the exhaust pipe 131.

[0140] The porous dielectric element 134 can be made of steel wool, mesh steel wire, or ceramic porous dielectric elements, etc. The 3D of the porous dielectric element 134 (e.g., steel wool) is a porous structure or a multi-pore structure. The porous dielectric element 134 is disposed in the exhaust pipe 131 so that the airflow about to flow out of the exhaust aftertreatment device through the exhaust pipe 131 can reduce both low-frequency noise (e.g., 20Hz to 500Hz) and high-frequency noise (e.g., >500Hz) under the action of the porous dielectric element 134, thereby significantly improving the acoustic performance of the exhaust aftertreatment device without increasing the exhaust cavity of the exhaust aftertreatment device.

[0141] Referring to Figure 25, in the eleventh embodiment illustrated in this application, the porous dielectric element 134 is located inside the housing 21 and inside the second end cap 24.

[0142] Twelfth Embodiment: The exhaust aftertreatment device in the twelfth embodiment of this application is similar in structure to the exhaust aftertreatment device in the eleventh embodiment illustrated in this application. The difference between the two lies in the exhaust pipe assembly 13.

[0143] Referring to Figure 26, in the twelfth embodiment illustrated in this application, the exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust gas aftertreatment device and a porous media element 134 fixed in the exhaust pipe 131.

[0144] The porous dielectric element 134 can be made of steel wool, mesh steel wire, or ceramic porous dielectric elements, etc. The 3D of the porous dielectric element 134 (e.g., steel wool) is a porous structure or a multi-pore structure. The porous dielectric element 134 is disposed in the exhaust pipe 131 so that the airflow about to flow out of the exhaust aftertreatment device through the exhaust pipe 131 can reduce both low-frequency noise (e.g., 20Hz to 500Hz) and high-frequency noise (e.g., >500Hz) under the action of the porous dielectric element 134, thereby significantly improving the acoustic performance of the exhaust aftertreatment device without increasing the exhaust cavity of the exhaust aftertreatment device.

[0145] Referring to Figure 26, in the twelfth embodiment illustrated in this application, the vent pipe 131 extends outward and protrudes from the second end cap 24. The porous media element 134 is located outside the housing 21 and outside the second end cap 24.

[0146] Specifically, the vent pipe 131 includes a first vent pipe section 1311 and a third vent pipe section 1313, wherein the first vent pipe section 1311 and the third vent pipe section 1313 are an integral part.

[0147] Thirteenth Embodiment: The exhaust aftertreatment device in the thirteenth embodiment illustrated in this application is similar in structure to the exhaust aftertreatment device in the twelfth embodiment of this application, except that the exhaust pipe assembly 13 is different.

[0148] Referring to Figures 27 and 28, in the thirteenth embodiment illustrated in this application, the exhaust pipe assembly 13 includes an exhaust pipe 131 for discharging exhaust gas from the exhaust gas aftertreatment device and a porous media element 134 fixed in the exhaust pipe 131.

[0149] Specifically, the vent pipe 131 includes a first vent pipe section 1311 and a third vent pipe section 1313. The first vent pipe section 1311 and the third vent pipe section 1313 are two separate parts, which are welded together. The porous media element 134 is fixed in the third vent pipe section 1313 to form a porous media assembly 135. By providing the porous media assembly 135, it is advantageous to fix the porous media element 134 in the third vent pipe section 1313, for example, by welding.

[0150] The above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. The understanding of this specification should be based on those skilled in the art. Although this specification has described this application in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. An air outlet assembly for use on an exhaust gas aftertreatment device, characterized by, The air outlet assembly comprises an air outlet pipe configured to let exhaust gas flow out of the exhaust gas aftertreatment device and a porous medium element located in the air outlet pipe and configured to let the exhaust gas pass through the porous medium element to reduce noise of the exhaust gas.

2. The air outlet assembly of claim 1, wherein: The porous medium element is welded to an inner wall of the air outlet pipe.

3. The air outlet assembly of claim 1, wherein: The porous medium element is steel wool with a wire diameter less than or equal to 1 mm.

4. The air outlet assembly of claim 1, wherein: The porous medium element has a density ρ, wherein 0.05 g / cm3≤ ρ ≤ 10 g / cm3.

5. The air outlet assembly of claim 1, wherein: The porous medium element is a mesh steel or ceramic porous medium element.

6. The air outlet assembly of claim 1, wherein: The air outlet pipe comprises a first air outlet pipe part and a second air outlet pipe part, which are either an integral part or two separate parts. The first air outlet pipe part is connected to the second air outlet pipe part, and the porous medium element is located in the first air outlet pipe part and / or the second air outlet pipe part.

7. The air outlet assembly of claim 6, wherein: The second air outlet pipe part comprises an open area provided with a plurality of sound-absorbing holes penetrating through a wall of the second air outlet pipe part. The air outlet assembly further comprises an outer shell wrapped around the open area and sound-absorbing cotton filled between the open 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 air outlet assembly of claim 1, wherein: The air outlet pipe comprises a first air outlet pipe part and a third air outlet pipe part, which are two separate parts and are connected to each other. The porous medium element is fixed to the third air outlet pipe part to form a porous medium assembly.

9. The air outlet assembly of claim 1, wherein: The air outlet assembly comprises an air outlet shell and an air outlet pipe assembly connected to the air outlet shell, and the air outlet pipe assembly comprises the air outlet pipe and the porous medium element.

10. The air outlet assembly of claim 1, wherein: The air outlet assembly comprises an air outlet pipe assembly and an end cover, the air outlet pipe assembly comprises 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 inside the end cover or extends out of the end cover.

11. An exhaust gas aftertreatment device, characterized in that The air outlet assembly comprises: an outer shell; an air inlet pipe; and an air outlet assembly according to any one of claims 1 to 8. The air outlet assembly comprises an air outlet shell and an air outlet pipe assembly connected to the air outlet shell, and the air outlet pipe assembly comprises the air outlet pipe and the porous medium element.

12. The exhaust aftertreatment device of claim 11, wherein: The exhaust gas aftertreatment device comprises an air inlet assembly comprising an air inlet shell and the air inlet pipe, the air inlet shell is fixed to the outer shell, and the air inlet shell and the air outlet shell are located on two sides of the outer shell, respectively.

13. The exhaust gas aftertreatment device of claim 12, wherein: The exhaust gas aftertreatment device comprises an exhaust gas aftertreatment carrier encapsulated in the outer shell, the air inlet pipe is located upstream of the exhaust gas aftertreatment carrier in the flow direction of the exhaust gas, and the air outlet pipe is located downstream of the exhaust gas aftertreatment carrier in the flow direction of the exhaust gas.

14. The exhaust aftertreatment device of claim 11, wherein: ​ 15. The exhaust aftertreatment device of claim 11, wherein: The air outlet assembly comprises an air outlet pipe assembly and an end cover, the air outlet pipe assembly comprises the air outlet pipe and the porous medium element, the air outlet pipe is fixed with the end cover, the end cover is fixed with the outer shell, and the air outlet pipe is located inside the outer shell or extends out of the end cover.

16. The exhaust aftertreatment device of claim 11, wherein: The exhaust gas aftertreatment device comprises an air inlet assembly, a first exhaust gas aftertreatment assembly, a second exhaust gas aftertreatment assembly, a mixer assembly, a third exhaust gas aftertreatment assembly; The air inlet assembly, the first exhaust gas aftertreatment assembly, the second exhaust gas aftertreatment assembly, the mixer assembly, the third exhaust gas aftertreatment assembly and the air outlet assembly are sequentially connected in the flow direction of the exhaust gas; The first exhaust gas aftertreatment assembly comprises a first shell and a diesel oxidation catalyst carrier encapsulated in the first shell; The second exhaust gas aftertreatment assembly comprises a second shell and a diesel particulate filter carrier encapsulated in the second shell; The third exhaust gas aftertreatment assembly comprises a third shell and a selective catalytic reduction carrier encapsulated in the third shell; The outer shell comprises the first shell, the second shell and the third shell; The air inlet assembly comprises an air inlet shell and the air inlet pipe, and the air inlet shell is fixed with the first shell; The air outlet assembly comprises an air outlet shell and an air outlet pipe assembly connected with the air outlet shell, the air outlet pipe assembly comprises the air outlet pipe and the porous medium element, and the air outlet shell is fixed with the third shell.

17. The exhaust gas aftertreatment device of claim 16, wherein: The air inlet assembly, the first exhaust gas aftertreatment assembly, the second exhaust gas aftertreatment assembly, the mixer assembly, the third exhaust gas aftertreatment assembly and the air outlet assembly are arranged in a straight line.

18. The exhaust gas aftertreatment device of claim 16, wherein: The first exhaust gas aftertreatment assembly and the second exhaust gas aftertreatment assembly are arranged in a straight line and located in a first row; The third exhaust gas aftertreatment assembly is arranged in a straight line and located in a 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 aftertreatment device is in a U shape as a whole.

19. The exhaust gas aftertreatment device of claim 11, wherein: The exhaust gas aftertreatment device is a muffler, and the outer shell has an internal cavity; The exhaust gas aftertreatment device comprises a first end cover fixed with one end of the outer shell, a second end cover fixed with the other end of the outer shell, 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 in communication with the internal cavity.

20. The exhaust aftertreatment device of claim 19, wherein: The air outlet pipe is located inside 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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