Post-processing device and vehicle

Abstract

According to the post-processing device and the vehicle, a DOC carrier sleeved with a noise reduction layer can be stably fixed in an outer shell through a mounting frame assembly, so that vibration airflow generated by pressure pulses generated by periodic opening and closing of an engine exhaust valve is introduced into an air inlet cavity through an air inlet pipe; when the DOC carrier passes through the DOC carrier, the DOC carrier is wrapped with the silencing layer, so that noise energy can be isolated or absorbed and transmitted to the mounting frame assembly, vibration of the mounting frame assembly relative to the outer shell is weakened, the low-frequency resonance area of the whole post-processing device can be reduced, and noise is reduced.

Description

Technical Field

[0001] This application relates to the technical field of vehicle accessories, and particularly to a post-treatment device and a vehicle. Background Art

[0002] Exhaust noise is the main noise source of an automobile, and it is usually 10 - 15 dB(A) higher than other noises. The exhaust noise is mainly generated by the pressure pulse generated by the periodic opening and closing of the engine exhaust valve, which excites the airflow vibration.

[0003] Based on this, a post-treatment device capable of reducing noise is needed. Utility Model Content

[0004] The purpose of this application is to provide a post-treatment device and a vehicle, which can reduce the low-frequency resonance region of the entire post-treatment device and reduce noise.

[0005] The embodiments of this application can be implemented as follows:

[0006] In a first aspect, the present utility model provides a post-treatment device, including an outer housing and a DOC carrier assembly located within the accommodation cavity of the outer housing;

[0007] The DOC carrier assembly includes a DOC carrier, a sound-absorbing layer, and a mounting frame assembly;

[0008] The sound-absorbing layer is made of sound-insulating material or sound-absorbing material, and the sound-absorbing layer at least wraps the outer peripheral wall of the DOC carrier assembly;

[0009] The mounting frame assembly is sleeved on the outer peripheral wall of the sound-absorbing layer and is fixedly connected to the inner peripheral wall of the outer housing.

[0010] In an optional embodiment, the mounting frame assembly includes a sleeve and a fixing plate. The sleeve is sleeved on the outer peripheral wall of the sound-absorbing layer. The fixing plate is annular and is sleeved outside the sleeve. The outer edge of the fixing plate is fixedly connected to the inner peripheral wall of the outer housing.

[0011] In an optional embodiment, the mounting frame assembly includes at least two fixing plates, and the fixing plates are spaced apart along the axial direction of the sleeve.

[0012] In an optional embodiment, a plurality of through holes are provided on one fixing plate among all the fixing plates that is axially closest to the intake front end of the DOC carrier.

[0013] In an optional embodiment, the inner edge of the fixing plate is fixedly connected to the outer peripheral wall of the sleeve through an annular first connecting member, and the axial length of the first connecting member is greater than the thickness of the fixing plate.

[0014] In an alternative embodiment, the first connecting member includes an axially extending first flange formed at an inner edge of the fixing plate.

[0015] In an alternative embodiment, an outer edge of the fixing plate is fixedly connected to an inner peripheral wall of the outer housing through an annular second connecting member, and an axial length of the second connecting member is greater than a thickness of the fixing plate.

[0016] In an alternative embodiment, the second connecting member includes an axially extending second flange formed at an outer edge of the fixing plate.

[0017] In an alternative embodiment, opposite ends of the DOC carrier in a length direction thereof are an intake front end and an exhaust rear end respectively;

[0018] The post-treatment device further includes:

[0019] An intake end cap assembly and an exhaust end cap assembly respectively connected to two ends of the outer housing in a length direction thereof, an intake cavity is formed between the intake end cap assembly and the intake front end, and an exhaust cavity is formed between the exhaust end cap assembly and the exhaust rear end;

[0020] An intake pipe, at least partially located in the intake cavity, and a portion of the intake pipe located in the intake cavity has a porous region;

[0021] An exhaust tail pipe, passing through the exhaust end cap assembly and extending into the exhaust cavity.

[0022] In a second aspect, the present utility model provides a vehicle, including the post-treatment device according to any one of the foregoing embodiments.

[0023] Compared with the prior art, beneficial effects of embodiments of the present application include, for example:

[0024] Through the mounting frame assembly, the DOC carrier sleeved with a sound-absorbing layer can be stably fixed in the outer housing. Thus, after the vibration airflow generated by the pressure pulse generated by the periodic opening and closing of the engine exhaust valve passes through the intake pipe and enters the intake cavity, when passing through the DOC carrier, since the DOC carrier is wrapped with a sound-absorbing layer, the noise energy can be isolated or absorbed and transmitted to the mounting frame assembly, thereby weakening the vibration of the mounting frame assembly relative to the outer housing. In this way, the low-frequency resonance region of the entire post-treatment device can be reduced and the noise can be lowered. Description of the Drawings

[0025] To more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 Is a perspective view of the post-treatment device according to an embodiment of the present application;

[0027] Figure 2 Is Figure 1 A sectional view of;

[0028] Figure 3 Is an exploded view of the DOC carrier assembly according to an embodiment of the present application;

[0029] Figure 4 Is Figure 2 An enlarged view of part A of;

[0030] Figure 5 Is a schematic view of the post-treatment device according to an embodiment of the present application after hiding the outer housing;

[0031] Figure 6 Is an exploded view of the intake end cover assembly according to an embodiment of the present application;

[0032] Figure 7 Is an exploded view of the outlet end cover assembly according to an embodiment of the present application.

[0033] Icon: 10 - Outer housing; 20 - Intake end cover assembly; 21 - Intake end cover; 22 - First perforated plate; 23 - First fixing bracket; 30 - Inlet pipe; 31 - Perforated area; 40 - DOC carrier assembly; 41 - DOC carrier; 42 - Mounting frame assembly; 420 - Sleeve; 421 - Fixed plate; 422 - First flanging; 423 - Second flanging; 424 - Through hole; 43 - Sound-absorbing layer; 60 - Outlet end cover assembly; 61 - Outlet end cover; 610 - First mounting hole; 62 - Second perforated plate; 620 - Second mounting hole; 63 - Second fixing bracket; 70 - Outlet tail pipe; 71 - Perforated pipe structure. Specific embodiments

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0035] Accordingly, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0036] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is customarily placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0038] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0039] In the description of the present application, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0040] The following will describe in detail some embodiments of the present application with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0041] Reference Figure 1 and Figure 2 , embodiments of the present application disclose a post-treatment device, which is mainly used to be installed on a vehicle and connected in series with the exhaust passage of an engine on the vehicle to purify the exhaust gas.

[0042] The post-treatment device includes a housing 10, an intake pipe 30, an intake end cover assembly 20, a DOC carrier assembly 40, an outlet end cover assembly 60, and an outlet tail pipe 70.

[0043] The housing 10 has a hollow structure, which can be a substantially hollow rectangular structure with both ends open in the length direction as shown in the figure, or of course a substantially hollow cylindrical structure with both ends open, as long as it can accommodate the installation of the DOC carrier assembly 40, the intake end cover assembly 20, the intake pipe 30, the outlet end cover assembly 60, and the outlet tail pipe 70.

[0044] The intake end cover assembly 20 and the outlet end cover assembly 60 are respectively connected to both ends of the housing 10 in the length direction.

[0045] The DOC carrier assembly 40 fixed inside the accommodation cavity of the housing 10 forms an intake cavity between the corresponding intake end cover assembly 20 and the DOC carrier assembly 40, and an outlet cavity between the outlet end cover assembly 60 and the DOC carrier assembly 40;

[0046] The intake pipe 30 is at least partially located in the intake cavity of the housing 10 so as to be able to connect with the external engine exhaust gas pipeline, thereby introducing the exhaust gas into the intake cavity, so that the exhaust gas passes through the DOC carrier assembly 40 for treatment and purification.

[0047] The outlet tail pipe 70 passes through the outlet end cover assembly 60 and extends into the outlet cavity, so that the gas purified by the DOC carrier assembly 40 is discharged through the outlet cavity and the outlet tail pipe 70.

[0048] Combined Figure 3 , the DOC carrier assembly 40 includes a DOC carrier 41, a sound-absorbing layer 43, and a mounting frame assembly 42.

[0049] The two ends of the DOC carrier 41 opposite to each other in its own length direction are respectively an intake front end and an outlet rear end. The intake front end is closer to the intake end cover assembly 20 than the outlet rear end. An intake cavity is formed between the intake front end and the intake end cover assembly 20, and an outlet cavity is formed between the outlet rear end and the outlet end cover assembly 60.

[0050] The sound-absorbing layer 43 is made of sound-insulating material or sound-absorbing material, and the sound-absorbing layer 43 at least wraps the outer peripheral wall of the DOC carrier 41;

[0051] The mounting frame assembly 42 is sleeved outside the sound-absorbing layer 43, and the mounting frame assembly 42 is fixedly connected to the inner peripheral wall of the housing 10, thereby realizing the fixed installation of the entire DOC carrier assembly 40 inside the housing 10. Among them, the inner peripheral wall of the housing 10 refers to the wall forming the accommodation cavity.

[0052] In this way, the DOC carrier 41 with the sound-absorbing layer 43 can be firmly fixed in the outer housing 10 through the mounting bracket assembly 42. After the vibration airflow generated by the pressure pulse caused by the periodic opening and closing of the engine exhaust valve passes through the intake pipe 30 and enters the intake cavity, when passing through the DOC carrier 41, the sound-absorbing layer 43 wrapped around the DOC carrier 41 can isolate or absorb the noise energy, reducing the noise energy transmitted to the mounting bracket assembly 42, thereby reducing the vibration of the mounting bracket assembly 42 relative to the outer housing 10. In this way, the low-frequency resonance area of the entire after-treatment device can be reduced and the noise can be lowered.

[0053] It should be noted that in the exhaust gas treatment technology, the "DOC carrier 41" specifically refers to the carrier used for the Diesel Oxidation Catalyst. DOC is the abbreviation of Diesel Oxidation Catalyst, which is used to reduce harmful gases in emissions. Its working principle is to use a catalyst to accelerate the oxidation reactions of carbon monoxide (CO), hydrocarbons (HC), and some particulate matter in the exhaust gas, converting them into harmless carbon dioxide (CO2), water (H2O), and other substances. At the same time, DOC can also convert some nitrogen oxides (NO) into nitrogen dioxide (NO2), providing more suitable reaction conditions for subsequent emission reduction technologies (such as the Selective Catalytic Reduction (SCR) system) and improving the overall exhaust gas treatment efficiency. The DOC carrier 41 can be made of metal or ceramic materials, which have a high specific surface area and good thermal stability to ensure that the catalyst can effectively contact the exhaust gas and withstand the high-temperature gas discharged from the engine. Ceramic carriers are widely used in DOC systems due to their high temperature resistance, high mechanical strength, and good chemical stability. These carriers are coated with noble metals (such as platinum, palladium) or base metal catalysts on their surfaces to promote the occurrence of oxidation reactions.

[0054] Sound-absorbing materials, also known as sound-damping materials or acoustic materials, are materials used to reduce sound energy, absorb sound waves, control noise, and improve the acoustic environment. They can reduce echoes, isolate noise, or improve sound quality. Sound-absorbing materials can be roughly classified into the following categories: 1. Porous sound-absorbing materials: including organic fibers (such as cotton, wool), inorganic fibers (such as glass fiber, rock wool), inorganic foams (such as foam glass, foam ceramics), and foam plastics. These materials have many tiny pores inside, which can absorb sound and convert it into heat energy. 2. Resonant sound-absorbing materials: Utilize specific structural designs, such as perforated plates, resonant cavities, etc., to absorb sound through the resonance effect between sound waves and the material structure. 3. Damping materials: Used to reduce vibration and structure-borne noise, usually made of rubber, polymers, or composite materials, which can absorb vibration energy and convert it into heat energy. 4. Sound-insulating materials: Such as steel plates, concrete, thick glass, etc., are used to isolate sound and prevent sound from passing through the material. 5. Composite materials: Combine the functions of sound absorption and sound insulation, usually composed of multiple layers of different materials, which can both absorb sound waves and prevent sound from spreading.

[0055] Sound-insulating materials refer to materials used to block or reduce the transmission of sound. Their main function is to reduce noise, improve acoustic privacy, or enhance the acoustic environment by absorbing, reflecting, or obstructing the transmission of sound waves. Sound-insulating materials come in a wide variety, and common ones include: 1. Sound-insulating felt: A thick and dense material with good sound absorption and insulation properties, commonly used for sound insulation treatment of walls, floors, and ceilings. 2. Sound-absorbing cotton: Easy to process, with moisture-proof and waterproof characteristics, good air permeability, suitable for absorbing medium and high-frequency sounds, but with poor flame retardancy. 3. Wave peak sound-absorbing sponge: The surface has a wavy structure, which can effectively absorb sound waves, reduce echoes and resonances, and is suitable for professional acoustic environments such as recording studios and studios. 4. Glass wool and foam aluminum: Have excellent sound absorption properties and are suitable for various industrial and commercial sound insulation requirements. 5. Perforated gypsum board and sound-absorbing paint: Suitable for walls and ceilings, which can improve the indoor acoustics by increasing the sound absorption ability of the surface. 6. Non-woven sound-insulating materials: Environmentally friendly and easy to use, suitable for sound insulation treatment in homes and public places. 7. Concrete walls, brick walls, steel plates, lead plates: These materials can effectively isolate sound due to their high density and mass, but usually need to be combined with other sound-insulating materials to improve the sound insulation effect.

[0056] In addition, it should also be noted that the sound-insulating material can be a material without air permeability effect, so that the sound-absorbing layer 43 needs to expose the air inlet front end and the air outlet rear end, so that the exhaust gas can pass through the DOC carrier to avoid the sound-insulating material blocking the exhaust gas.

[0057] When the sound-absorbing layer 43 adopts a sound-insulating material or a sound-absorbing material that can breathe, the sound-absorbing layer 43 can only cover the outer peripheral wall of the DOC carrier 41, or can cover at least a part of the intake front end and / or the exhaust rear end, that is, the sound-absorbing layer 43 at least wraps the outer peripheral wall of the DOC carrier 41.

[0058] Specifically, in combination with Figure 3 and Figure 4 , the mounting bracket assembly 42 includes a sleeve 420 and a fixing plate 421. The sleeve 420 is sleeved on the outer peripheral wall of the sound-absorbing layer 43. The fixing plate 421 is generally annular and is sleeved outside the sleeve 420. The outer edge of the fixing plate 421 is used for fixedly connecting with the inner wall of the outer housing 10, so as to realize the fixed installation of the DOC carrier 41 wrapped with the sound-absorbing layer 43 in the outer housing 10, and also facilitate the assembly of the DOC assembly.

[0059] The number of the fixing plates 421 can be one or more than two, as long as the fixed connection of the DOC carrier 41 relative to the outer housing 10 can be realized.

[0060] When the mounting bracket assembly 42 includes at least two fixing plates 421, the fixing plates 421 are spaced apart along the axial direction of the sleeve 420, which can improve the mounting reliability of the DOC carrier assembly 40 and reduce the vibration risk.

[0061] Among them, a plurality of through holes 424 are provided on one fixing plate 421 that is axially closest to the intake front end among all the fixing plates 421, so as to reduce the back pressure.

[0062] In addition, in some embodiments, adjacent two fixing plates 421 can be connected by a reinforcing member, which can further improve the structural strength of the DOC carrier assembly 40 and further reduce the vibration risk.

[0063] The inner edge of the fixing plate 421 can be fixedly connected to the outer peripheral wall of the sleeve 420 through an annular first connecting member, and the axial length of the first connecting member is greater than the thickness of the fixing plate 421, which can increase the area of the connection region between the fixing plate 421 and the sleeve 420, so as to improve the connection reliability between the two and prevent relative vibration between the two. The inner edge of the fixing plate 421 is the inner peripheral wall of the annular fixing plate 421 for forming the middle through opening.

[0064] For example, the first connecting member includes a first flange 422 formed on the inner edge of the fixing plate 421 and extending along the axial direction of the DOC carrier assembly 40. In this way, the first flange 422 and the fixing plate 421 form an integral structure, and the inner peripheral wall of the first flange 422 is fixedly connected to the outer peripheral wall of the sleeve 420, so as to improve the connection reliability between the two and prevent relative vibration between the two.

[0065] The outer edge of the fixing plate 421 can be fixedly connected to the inner peripheral wall of the outer housing 10 through an annular second connecting member, and the axial length of the second connecting member is greater than the thickness of the fixing plate 421, so as to increase the connection area between the fixing plate 421 and the outer housing 10, thereby improving the connection reliability between the two and preventing relative vibration between them.

[0066] For example, the second connecting member includes a second flange 423 formed on the outer edge of the fixing plate 421 and extending along the axial direction of the DOC carrier assembly 40. In this way, the second flange 423 and the fixing plate 421 form an integral structure, and the outer peripheral wall of the second flange 423 is fixedly connected to the inner peripheral wall of the outer housing 10, thereby improving the connection reliability between the two and preventing relative vibration between them.

[0067] The first flange 422 of the fixing plate 421 is welded to the sleeve 420, and at the same time, the second flange 423 of the fixing plate 421 is also welded to the outer housing 10, that is, the mounting frame assembly 42 is welded to the inner wall of the outer housing 10, so as to ensure the connection strength, further reduce vibration and reduce noise generation.

[0068] In this embodiment, the fixing plate 421 is in a flat plate shape, which is beneficial to improving the structural compactness.

[0069] In other embodiments, the first connecting member and the second connecting member can also be separate annular members, as long as their axial lengths are greater than the thickness of the fixing plate 421. In this way, the inner peripheral wall of the first connecting member is fixedly connected to the outer peripheral wall of the sleeve 420 by welding, bonding or interference fit, etc., the outer peripheral wall of the first connecting member is fixedly connected to the inner edge of the fixing plate 421 by welding, bonding or interference fit, etc., and the inner peripheral wall of the second connecting member is fixedly connected to the outer edge of the fixing plate 421 by welding, bonding or interference fit, etc., and the outer peripheral wall of the second connecting member is fixedly connected to the inner peripheral wall of the outer housing 10 by welding, bonding or interference fit. In this way, the connection strength between the fixing plate 421 and the sleeve 420 and the outer housing 10 can also be improved, which is beneficial to reducing vibration and reducing noise generation.

[0070] Of course, it can be understood that in other embodiments, the fixing plate 421 may not be provided with the first connecting member or the second connecting member; or the first connecting member or the second connecting member may not be provided on one of the fixing plates 421.

[0071] In addition, in some embodiments, a plurality of concave and convex structures may be provided at intervals along the circumferential direction of the DOC carrier 41 on the inner peripheral wall of the outer housing 10 and on the outer peripheral wall of the sleeve 420, and a plurality of corresponding concave and convex structures are provided on the fixing plate 421, which are fixedly connected to the outer housing 10 and the sleeve. The fixing plate 421 may also be provided with protrusions at intervals along the circumferential direction, and then there are corresponding slots on the outer housing 10. After inserting the protrusions of the fixing plate 421 into the slot portion of the outer housing 10 first, the outer housing 10 is made into a barrel shape, and the fixing plate 421 is welded and fixed from the outside of the outer housing 10 first, and then the DOC carrier 41 is inserted into the middle hole of the fixing plate 421 for fixed connection.

[0072] In this embodiment, the side wall of the outer housing 10 is provided with a through air inlet mounting hole, and the air inlet pipe 30 is inserted through the air inlet mounting hole and is in sealing fit, so that one end of the air inlet pipe 30 is located inside the air inlet cavity, and the other end is located outside the outer housing 10 for the exhaust gas to pass through. Of course, in some embodiments, the air inlet pipe 30 may also be entirely located inside the air inlet cavity, and the other end is connected to the air inlet mounting hole, and then connecting to an external exhaust gas pipe is also feasible.

[0073] Combined Figure 1 、 Figure 2 and Figure 5 With, the end of the air inlet pipe 30 located inside the air inlet cavity is fixedly connected to the inner wall of the outer housing 10. The part of the air inlet pipe 30 located inside the air inlet cavity has a porous area 31. In this way, after the vibrating air flow enters the air inlet pipe 30, it can enter the air inlet cavity through the porous area 31. Since the end of the air inlet pipe is fixedly connected to the inner wall of the outer housing 10, the vibration phenomenon of the air inlet pipe 30 can be slowed down, the noise can be further reduced, and at the same time, the porous area 31 can play a role in absorbing and buffering the noise energy, so that the low-frequency resonance area of the entire post-treatment device can be further reduced and the noise can be reduced.

[0074] The connection method between the end of the air inlet pipe 30 located inside the air inlet cavity and the inner wall of the outer housing 10 is not specifically limited, and it can be welding to reduce the vibration of the outer housing 10 and further reduce the generation of noise.

[0075] The porous area 31 on the air inlet pipe 30 is distributed in an arc-shaped curved surface around the central axis of the air inlet pipe 30. The shape of the radial cross-section of the arc-shaped curved surface is a major arc. Therefore, the central angle of the distribution of the porous area 31 on the air inlet pipe 30 is greater than 180°, and the edge part of the porous area 31 faces the DOC carrier 41; that is, most of the porous area 31 is close to the air inlet end cover assembly 20, and a small part is close to the DOC carrier 41. The gas in the air inlet pipe 30 mainly enters the air inlet cavity from the area facing the air inlet end cover assembly 20, reducing the noise energy, and in this way, the gas pressure loss can be reduced, and the gas can enter the DOC carrier 41 evenly for purification treatment, avoiding affecting the back pressure and treatment uniformity of the post-treatment device itself.

[0076] In other embodiments, the intake pipe 30 may also be elliptical, columnar, etc., and the porous region 31 is provided on the outer peripheral wall of the intake pipe.

[0077] Combined Figure 6 , the intake end cover assembly 20 includes an intake end cover 21 and a first porous plate 22; the intake end cover 21 is connected to one end of the outer housing 10, and the middle region of the intake end cover 21 is recessed outward relative to the DOC carrier 41, that is, the middle region of the intake end cover 21 is recessed in a direction away from the DOC carrier 41; the first porous plate 22 is connected to the side of the edge region of the intake end cover 21 facing the DOC carrier 41. In this way, one end of the outer housing 10 is closed by the intake end cover 21, and an intake cavity is formed between the intake end cover 21 and the DOC carrier 41. At the same time, the first porous plate 22 is provided to absorb noise energy and further reduce the generation of noise.

[0078] Among them, the intake end cover assembly 20 further includes at least one first fixing bracket 23 connected between the middle region of the intake end cover 21 and the middle region of the first porous plate 22. For example, it may be the four first fixing brackets 23 shown in the figure. In this way, the connection reliability between the intake end cover 21 and the first porous plate 22 can be improved, and the first porous plate 22 can be prevented from vibrating.

[0079] Combined Figure 7 , the outlet end cover assembly 60 includes an outlet end cover 61 and a second porous plate 62; the outlet end cover 61 is connected to the other end of the outer housing 10, and the middle region of the outlet end cover 61 is recessed outward relative to the DOC carrier 41, that is, the middle region of the outlet end cover 61 is recessed in a direction away from the DOC carrier 41; the second porous plate 62 is connected to the side of the edge region of the outlet end cover 61 facing the inside of the outer housing 10; the outlet tail pipe 70 passes through the outlet end cover 61 and the second porous plate 62 to extend into the outlet cavity to ensure that the processed gas can normally be discharged from the outlet tail pipe 70. In this way, the other end of the outer housing 10 is closed by the outlet end cover 61, and an outlet cavity is formed between the outlet end cover 61 and the DOC carrier assembly 40. At the same time, the second porous plate 62 is provided to absorb the noise energy transmitted to the rear end and further reduce the generation of noise.

[0080] Among them, the outlet end cover assembly 60 further includes at least one second fixing bracket 63 connected between the middle region of the outlet end cover 61 and the middle region of the second porous plate 62. For example, it may be the three second fixing brackets 63 shown in the figure. In this way, the connection reliability between the outlet end cover 61 and the first porous plate 22 can be improved, and the second porous plate 62 can be prevented from vibrating.

[0081] Of course, for the convenience of the exhaust tail pipe 70 passing through the exhaust end cover 61 and the second porous plate 62, the exhaust end cover 61 is provided with a first mounting hole 610, and correspondingly, the second porous plate 62 is provided with a second mounting hole 620. The first mounting hole 610 and the second mounting hole 620 are coaxially arranged. The exhaust tail pipe 70 is inserted through the first mounting hole 610 and the second mounting hole 620 and sealed. For example, the connection and sealing can be achieved by welding, or can also be sealed by a sealing ring.

[0082] It should also be noted that the part of the exhaust tail pipe 70 located inside the outer housing 10 is a porous pipe structure 71, that is, a plurality of openings are formed in the part of the exhaust tail pipe 70 located in the exhaust cavity, so as to facilitate the smooth flow of air, reduce the overall back pressure of the post-treatment device, and also reduce the generation of noise.

[0083] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A post-processing device, characterized in that: It comprises an outer shell and a DOC carrier assembly located in a receiving cavity of the outer shell; The DOC carrier assembly comprises a DOC carrier (41), a sound-absorbing layer (43) and a mounting frame assembly (42); The sound-absorbing layer (43) is made of a sound-insulating material or a sound-absorbing material, and the sound-absorbing layer (43) at least wraps the outer peripheral wall of the DOC carrier assembly; The mounting frame assembly (42) is sleeved on the outer peripheral wall of the sound-absorbing layer (43) and is fixedly connected to the inner peripheral wall of the outer shell (10).

2. The post-processing device according to claim 1, characterized in that: The mounting frame assembly (42) comprises a sleeve (420) and a fixing plate (421), wherein the sleeve (420) is sleeved on the outer peripheral wall of the sound-absorbing layer (43), and the fixing plate (421) is annular and sleeved outside the sleeve (420), and the outer edge of the fixing plate (421) is fixedly connected to the inner peripheral wall of the outer shell (10).

3. The post-processing device according to claim 2, characterized in that: The mounting frame assembly (42) comprises at least two fixing plates (421), and the fixing plates (421) are spaced apart and distributed along the axial direction of the sleeve (420).

4. The post-processing device according to claim 3, characterized in that: A plurality of through holes (424) are provided on a fixing plate (421) which is closest to the air intake front end of the DOC carrier (41) in the axial direction among all the fixing plates (421).

5. The post-processing device according to claim 2, characterized in that: The inner edge of the fixing plate (421) is fixedly connected to the outer peripheral wall of the sleeve (420) via an annular first connecting piece, and the axial length of the first connecting piece is greater than the thickness of the fixing plate (421).

6. The post-processing device according to claim 5, characterized in that: The first connecting member comprises an axially extending first flange (422) formed on the inner edge of the fixing plate (421).

7. The post-processing device according to any one of claims 2 to 6, characterized in that: The outer edge of the fixing plate (421) is fixedly connected to the inner peripheral wall of the outer shell (10) via an annular second connecting piece, and the axial length of the second connecting piece is greater than the thickness of the fixing plate (421).

8. The post-processing device according to claim 7, characterized in that: The second connecting member comprises an axially extending second flange (423) formed on the outer edge of the fixing plate (421).

9. The post-processing device according to claim 1, characterized in that: The two opposite ends of the DOC carrier (41) along its length direction are respectively an air inlet front end and an air outlet rear end; The post-processing device also includes: An air inlet cover assembly (20) and an air outlet cover assembly (60) are respectively connected to both ends of the outer shell (10) in the length direction, an air inlet cavity is formed between the air inlet cover assembly (20) and the air inlet front end, and an air outlet cavity is formed between the air outlet cover assembly (60) and the air outlet rear end; An air intake pipe (30) is at least partially located in the air intake cavity, and a portion of the air intake pipe (30) located in the air intake cavity has a porous area (31); An outlet tail pipe (70) passes through the outlet end cover assembly (60) and extends into the outlet cavity.

10. A vehicle, characterized in that: The invention comprises the post-processing device according to any one of claims 1 to 9.

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