Exhaust gas purification muffler and vehicle

Abstract

The application relates to the technical field of vehicle tail gas treatment, and provides a tail gas purification and silencing device and a vehicle. The tail gas purification and silencing device comprises an outer shell body provided with an air inlet pipe and an air outlet pipe, an inner shell body arranged in the outer shell body, and a purification assembly and a silencing assembly. The air inlet end of the inner shell body is connected to the outer shell body and communicates with the air inlet pipe; the air outlet end of the inner shell body is located in the outer shell body and communicates with a silencing cavity formed between the inner shell body and the outer shell body; the purification assembly is arranged in the inner shell body, and the silencing assembly is arranged in the silencing cavity; tail gas entering through the air inlet pipe flows through the purification assembly and the silencing assembly in sequence and is discharged through the air outlet pipe. The tail gas purification and silencing device has a double-layered shell structure, greatly reduces the length of the pipeline in the tail gas emission system and the flange connection structure of the pipeline, is beneficial to reducing the system quality, optimizing the space layout level and improving the utilization rate of the system on the vehicle chassis space.

Description

Technical Field

[0001] This application relates to the field of vehicle exhaust gas treatment technology, and in particular to an exhaust gas purification and silencing device and a vehicle. Background Technology

[0002] Traditional vehicle exhaust systems, due to the need for components such as mufflers and purification systems, generally suffer from problems such as long and loosely structured piping layouts, resulting in a large heat radiation area and significant energy loss. Moreover, because of the long exhaust path design, and the need to consider the dispersed placement of mufflers, purification devices, etc., the entire exhaust system requires a large amount of chassis space, leading to certain difficulties in spatial layout and installation.

[0003] At the same time, with increasingly stringent global carbon emission standards and the rise of new energy vehicles, a large amount of space needs to be reserved in the chassis of new energy vehicles for battery pack configuration. This poses new requirements for the structural layout of the exhaust emission system. Therefore, it is urgent to optimize the structural design of the exhaust emission system in order to achieve the goals of structural weight reduction and improved space utilization. Utility Model Content

[0004] In view of this, this application aims to propose an exhaust gas purification and silencing device to optimize the structural layout of the exhaust gas emission system and improve the system's utilization rate of vehicle chassis space.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] An exhaust gas purification and silencing device includes an outer shell with an intake pipe and an exhaust pipe, an inner shell disposed within the outer shell, and a purification component and a silencing component. The intake end of the inner shell is connected to the outer shell and communicates with the intake pipe. The exhaust end of the inner shell is located inside the outer shell and communicates with a silencing cavity formed between the inner shell and the outer shell. The purification component is disposed within the inner shell, and the silencing component is disposed within the silencing cavity. Exhaust gas entering through the intake pipe flows sequentially through the purification component and the silencing component before being discharged through the exhaust pipe.

[0007] Furthermore, the outer shell is provided with a first end cover and a second end cover at both ends, and the air inlet end of the inner shell, the air inlet pipe and the exhaust pipe are all connected to the second end cover.

[0008] Furthermore, both the inner shell and the outer shell are cylindrical and arranged coaxially. A first tapered tube is provided between the air outlet of the inner shell and the first end cap. The radial dimension of the first tapered tube gradually increases in the direction from the inner shell to the first end cap, and a through hole is provided on the tube wall of the first tapered tube.

[0009] Furthermore, the air intake pipe is connected to the air intake end of the inner shell through a second tapered pipe with a gradually increasing radial dimension.

[0010] Furthermore, the silencing assembly includes a plurality of inner partitions and an inner core tube spaced apart within the silencing cavity; the inner partitions divide the silencing cavity into a plurality of sub-cavities, and the inner core tube passes through the inner partitions to connect each of the sub-cavities; the exhaust pipe passes through the second end cap and is connected to any of the inner core tubes.

[0011] Furthermore, at least a portion of the inner partition and the inner core tube have through holes in their tube walls.

[0012] Furthermore, the purification assembly includes a catalyst and a particulate filter arranged sequentially along the flow path of the exhaust gas.

[0013] Furthermore, a first gasket is provided between the catalyst and the inner wall of the inner shell, and / or a second gasket is provided between the particulate trap and the inner wall of the inner shell.

[0014] Furthermore, a heat insulation cover is fitted over the outer surface of the inner shell, and the sound-absorbing cavity is located outside the heat insulation cover.

[0015] Compared with related technologies, this application has the following advantages:

[0016] (1) The exhaust gas purification and silencing device of this application adopts a double-layer shell structure. The purification component is set in the inner shell and the silencing component is set in the silencing cavity formed by the jacket space. This realizes the integrated purification and silencing functions in the exhaust gas emission system. The two functions are integrated into a compact and continuous flow channel structure, which greatly reduces the length of the pipeline and the matching pipeline flange connection structure in the exhaust gas emission system. This not only helps to reduce the system weight, but also helps to optimize the spatial layout level and improve the system's utilization rate of the vehicle chassis space.

[0017] (2) A first end cover and a second end cover are respectively provided at both ends of the outer shell to facilitate the disassembly and assembly of the outer shell and the assembly of internal components such as the inner shell in the outer shell; the air inlet end, air inlet pipe and exhaust pipe of the inner shell are all installed on the second end cover, and the installation of the inner shell, air inlet pipe and exhaust pipe on the second end cover can be completed in advance, and then the second end cover is installed on the main body of the outer shell, making the assembly of the device more convenient; at the same time, since the air inlet end and air inlet pipe of the inner shell are both located on the second end cover, it is easy to connect the two; and since the exhaust pipe is also on the second end cover, the exhaust gas flowing out from the air outlet end of the inner shell needs to pass through the entire silencer cavity before it can be discharged from the exhaust pipe, which is beneficial to improving the silencing effect of the silencer assembly.

[0018] (3) Both the inner shell and the outer shell adopt a cylindrical structure, which is not only standardized in shape and easy to process and construct, but also easy to form a standardized and efficient gas flow channel; furthermore, the first conical tube located between the air outlet end of the inner shell and the first end cover is designed to be similar to a trumpet shape, which can not only provide good support for the air outlet end of the inner shell, but also allow the exhaust gas discharged from the inner shell to be smoothly guided and diffused, and enter the area where the silencing component is located in the silencing cavity through the through hole on the first conical tube.

[0019] (4) Given that the radial dimension of the inner housing is larger than that of the vehicle exhaust pipe, the diameter of the intake pipe is basically the same as that of the exhaust pipe because the intake pipe needs to be connected to the exhaust pipe through the intake flange at its end. A horn-shaped second conical pipe is set at the intake end of the intake pipe and the inner housing to form a good size transition, which is conducive to the exhaust gas in the exhaust pipe passing smoothly through the intake pipe and the second conical pipe into the inner housing so that it can be smoothly purified by the purification component.

[0020] (5) Multiple chambers can be separated by the inner partition plate inside the silencing cavity. At the same time, an inner core tube is set on the inner partition plate to realize the connection between the chambers, thereby constructing a tortuous labyrinth-like exhaust gas channel. During the process of exhaust gas flowing through this channel, its noise energy will be absorbed in large quantities, so that the silencing component can play a good silencing role.

[0021] (6) By setting through holes on the wall of some or all of the inner core tubes and on some or all of the inner baffles, the flow efficiency of exhaust gas can be enhanced and noise can be eliminated better, thereby further improving the noise reduction performance of the muffler assembly.

[0022] (7) A catalyst and a particulate filter are installed in sequence inside the inner shell as a purification component, which can achieve good purification and dust removal effect to ensure that the exhaust gas emission meets the requirements of relevant standards.

[0023] (8) A gasket is installed between the catalyst and the inner shell, and between the particulate filter and the inner shell, to ensure the airtightness of the component assembly position and prevent the exhaust gas from bypassing the catalyst or particulate filter, thereby ensuring the smooth realization of the purification and dust removal function of the purification component.

[0024] (9) A heat insulation cover is installed on the outside of the inner shell, which can effectively reduce the heat loss and heat radiation of high temperature exhaust gas during the process of passing through the purification components, so that the catalyst can work under high temperature conditions and thus carry out high temperature catalytic reaction more efficiently to convert harmful gases such as carbon monoxide (CO), nitrogen oxides (NOx), and hydrocarbons (HC) in the exhaust gas into carbon dioxide, water and nitrogen.

[0025] Another object of this application is to provide a vehicle equipped with the exhaust gas purification and muffler device described in this application. The vehicle of this application possesses the technical advantages of the aforementioned exhaust gas purification and muffler device. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application. The directional terms such as front / back, up / down, etc., used therein are only used to indicate relative positional relationships and do not constitute an improper limitation of this application. In the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the overall external structure of the exhaust gas purification and silencing device described in the embodiments of this application;

[0028] Figure 2 for Figure 1 A bottom view of the exhaust gas purification and silencer device shown.

[0029] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure at position AA in the middle;

[0030] Figure 4 This is a schematic diagram of the internal structure of the exhaust gas purification and silencing device described in the embodiments of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Inlet flange; 2. Inlet pipe;

[0033] 3. Purification components; 301. Second conical tube; 302. Catalyst; 303. Particulate trap; 304. Inner shell; 305. First gasket; 306. Second gasket; 307. First conical tube; 308. Heat insulation cover;

[0034] 4. Silencing assembly; 401. Outer shell; 402. First end cap; 403. Second end cap; 404. First inner partition; 405. Second inner partition; 406. Third inner partition; 407. First inner core tube; 408. Second inner core tube; 409. Third inner core tube; 41. First silencing cavity; 42. Second silencing cavity; 43. Third silencing cavity; 44. Fourth silencing cavity;

[0035] 5. Exhaust pipe. Detailed Implementation

[0036] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0038] Furthermore, it should be stated in the description of this application that if terms such as "up," "down," "left," "right," "front," "back," "inner," or "outer" appear, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the purpose of describing this application and making the expression clear and concise, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joint," and "connector" should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances. The qualifying terms such as "first," "second," "A," "B," "C," and "D" appearing in the description of this application are merely for distinguishing similar features in different locations, attributions, or uses, in order to avoid ambiguity and confusion, and should not be construed as indicating or implying relative importance.

[0040] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] Traditional vehicle exhaust systems, due to the need for components such as mufflers and purification, generally suffer from problems such as lengthy piping layouts and loose structures, resulting in large heat radiation areas and significant energy loss. The lengthy exhaust path design leads to uneven distribution of exhaust gas velocity and pressure within the system, exacerbating thermal stress on materials and hindering the achievement of vehicle lightweighting goals. Furthermore, the exhaust system designs in related technologies, due to their lengthy piping, rely heavily on redundant pipe materials for support, increasing the overall weight of the system and introducing potential leakage risks due to multiple welded sections and flange connections.

[0042] At the same time, with increasingly stringent global carbon emission standards and higher energy efficiency requirements for new energy vehicles, the high thermal inertia and mass load of traditional exhaust emission systems have become key bottlenecks restricting vehicle power performance and range. Therefore, it is urgent to optimize the structural design of exhaust emissions in order to achieve the goals of structural weight reduction and improved thermal management efficiency.

[0043] In view of the above-mentioned problems in the related technologies, this application innovatively proposes a brand-new exhaust gas purification and silencing device, which can optimize the structural layout of the exhaust gas emission system and improve the system's utilization rate of vehicle chassis space.

[0044] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0045] An embodiment of the first aspect of this application provides an exhaust gas purification and silencing device, applied to vehicle exhaust gas treatment scenarios; one exemplary structure is as follows: Figure 1 , Figure 2 and Figure 3 As shown.

[0046] Overall, the exhaust gas purification and silencing device includes an outer housing 401 with an intake pipe 2 and an exhaust pipe 5, an inner housing 304 disposed within the outer housing 401, a purification component 3, and a silencing component 4. The intake end of the inner housing 304 is connected to the outer housing 401 and communicates with the intake pipe 2; the outlet end of the inner housing 304 is located inside the outer housing 401 and communicates with the silencing cavity formed between the inner housing 304 and the outer housing 401. The purification component 3 is disposed within the inner housing 304, and the silencing component 4 is disposed within the silencing cavity. Exhaust gas entering through the intake pipe 2 flows sequentially through the purification component 3 and the silencing component 4 before being discharged through the exhaust pipe 5, thus completing the purification and silencing treatment of vehicle exhaust gas.

[0047] Based on the above overall design concept, a double-layer shell structure is adopted. The purification component 3 is set in the inner shell 304, and the silencing component 4 is set in the silencing cavity formed by the jacket space. This realizes the integrated purification and silencing functions of the exhaust gas emission system. The two major functions are integrated into a compact and continuous flow channel structure, which greatly reduces the length of the pipeline and the supporting pipeline flange connection structure in the exhaust gas emission system. This not only helps to reduce the system weight, but also helps to optimize the spatial layout and improve the system's utilization rate of the vehicle chassis space.

[0048] It should be noted that, based on the above overall design concept, the technical solution of this application can adopt a variety of different specific implementation structures, forms, or configuration sequences. For example, the outer shell 401 and inner shell 304 can be square or cylindrical; the purification component 3 can be a particulate trap 303, a catalyst 302, or a combination of both; the silencing component 4 can adopt a labyrinthine silencing structure or a multi-chamber structure. The specific arrangement sequence and assembly method of the inner shell 304, outer shell 401, purification component 3, and silencing component 4 can also be flexibly adjusted. For parts required for the implementation of the overall solution but not covered in the above overall setup, reasonable and flexible designs can be made by referring to mature setup methods in the field and the actual situation during implementation, which will not be elaborated here. The specific implementation schemes described below in this embodiment are only one of the many solutions that can be formed by the above combinations and variations. In actual implementation, those skilled in the art can make flexible adjustments and improvements based on the actual situation. Obviously, the many solutions that can be formed by the above combinations and variations, as well as the specific implementation schemes of this embodiment, are all within the protection scope of this application.

[0049] Specifically, in this embodiment, as Figure 3 and Figure 4 As shown, in some preferred exemplary embodiments, the outer casing 401 has a first end cap 402 and a second end cap 403 at both ends, and the air inlet, air inlet pipe 2, and exhaust pipe 5 of the inner casing 304 are all connected to the second end cap 403. Providing the first end cap 402 and the second end cap 403 at both ends of the outer casing 401 facilitates the disassembly and assembly of the outer casing 401, as well as the assembly of internal components such as the inner casing 304 within the outer casing 401. By installing the air inlet, air inlet pipe 2, and exhaust pipe 5 of the inner casing 304 onto the second end cap 403, the installation of the inner casing 304, air inlet pipe 2, and exhaust pipe 5 onto the second end cap 403 can be completed in advance, and then the second end cap 403 can be installed onto the main body of the outer casing 401, making the assembly of the device more convenient. Meanwhile, since the air inlet end of the inner housing 304 and the air inlet pipe 2 are both located on the second end cover 403, it is easy to connect the two. Furthermore, since the exhaust pipe 5 is also on the second end cover 403, the exhaust gas flowing out from the air outlet end of the inner housing 304 needs to pass through the entire muffler cavity before it can be discharged from the exhaust pipe 5, which is beneficial to improving the noise reduction effect of the muffler assembly 4.

[0050] As mentioned above, the inner shell 304 and the outer shell 401 can adopt various different shapes. However, preferably, in this embodiment, both the inner shell 304 and the outer shell 401 are cylindrical and arranged coaxially. Based on this, a first tapered tube 307 is provided between the air outlet end of the inner shell 304 and the first end cap 402; and, in the direction from the inner shell 304 to the first end cap 402, the radial dimension of the first tapered tube 307 gradually increases, forming a trumpet shape, and the tube wall of the first tapered tube 307 is provided with through holes.

[0051] Both the inner shell 304 and the outer shell 401 adopt a cylindrical structure, which is not only standardized in shape and easy to process and construct, but also facilitates the formation of a standardized and efficient gas flow channel. Furthermore, the first tapered tube 307 located between the air outlet end of the inner shell 304 and the first end cover 402 is designed to resemble a trumpet shape. This not only provides good support for the air outlet end of the inner shell 304, but also allows the exhaust gas discharged from the inner shell 304 to be smoothly guided and diffused, and enters the area where the silencing component 4 is located in the silencing cavity through the through hole on the first tapered tube 307.

[0052] In addition, preferably, in this embodiment, the intake pipe 2 is also connected to the intake end of the inner housing 304 via a second tapered pipe 301 with a gradually increasing radial dimension. Given that the radial dimension of the inner housing 304 is larger than that of the vehicle's exhaust pipe, and since the intake pipe 2 needs to be connected to the exhaust pipe via its end-entry flange 1, the diameter of the intake pipe 2 is essentially the same as that of the exhaust pipe. The placement of the flared second tapered pipe 301 at the intake ends of the intake pipe 2 and the inner housing 304 creates a good dimensional transition, facilitating the smooth passage of exhaust gas from the exhaust pipe through the intake pipe 2 and the second tapered pipe 301 into the inner housing 304, so that it can be effectively purified by the purification assembly 3.

[0053] Still Figure 3 As shown, the purification component 3 in this embodiment includes a catalyst 302 and a particulate filter 303 arranged sequentially along the flow path of the exhaust gas. The catalyst 302 and particulate filter 303 are arranged sequentially within the inner housing 304. Used as the purification component 3, this arrangement achieves good purification and dust removal effects, ensuring that the exhaust gas emissions meet the requirements of relevant standards.

[0054] Simultaneously, sealing structures such as gaskets can be provided between the purification component 3 and the inner housing 304; for example, a first gasket 305 can be provided between the catalyst 302 and the inner wall of the inner housing 304, and a second gasket 306 can be provided between the particulate filter 303 and the inner wall of the inner housing 304. Providing gaskets between the catalyst 302 and the inner housing 304, and between the particulate filter 303 and the inner housing 304, ensures the airtightness of the component assembly positions, preventing exhaust gas from bypassing the catalyst 302 or the particulate filter 303, thereby ensuring the smooth realization of the purification and dust removal function of the purification component 3.

[0055] Since the catalytic reaction of the catalyst 302 needs to be carried out under high temperature conditions, a heat insulation cover 308 can be installed outside the inner shell 304, so that the entire silencing cavity is located outside the heat insulation cover 308. Installing the heat insulation cover 308 outside the inner shell 304 can effectively reduce heat loss and heat radiation of the high-temperature exhaust gas during the process of passing through the purification component 3, enabling the catalyst 302 to operate under high temperature conditions and thus carry out the high-temperature catalytic reaction more efficiently, converting harmful gases such as carbon monoxide (CO), nitrogen oxides (NOx), and hydrocarbons (HC) in the exhaust gas into carbon dioxide, water, and nitrogen.

[0056] For the specific selection and configuration of the catalytic converter 302 and the particulate filter 303, mature solutions in relevant technologies can be referenced. For example, the catalytic converter 302 can be a three-way catalytic converter, which converts harmful gases such as carbon monoxide (CO), nitrogen oxides (NOx), and hydrocarbons (HC) in the exhaust gas into carbon dioxide, water, and nitrogen through a high-temperature catalytic reaction; and uses precious metal catalysts (such as platinum and palladium) to promote the redox reaction, improving fuel economy and extending engine life. The particulate filter 303 can be a ceramic filter, which can effectively intercept solid particulate matter (such as PM2.5, i.e., suspended particulate matter with an aerodynamic equivalent diameter ≤ 2.5 micrometers) in the exhaust gas, reducing exhaust particulate matter emissions by more than 90%.

[0057] As mentioned above, there are of course multiple structural options available for the noise reduction component 4. In this embodiment, such as... Figure 4 As shown, the muffler assembly 4 includes multiple inner partitions and an inner core tube spaced apart within the muffler cavity. The inner partitions divide the muffler cavity into multiple sub-cavities, and the inner core tube passes through the inner partitions to connect the various sub-cavities. The exhaust pipe 5 passes through the second end cap 403 and connects to any of the inner core tubes, thus achieving communication with the muffler cavity and smoothly discharging the exhaust gas from the muffler cavity. The inner partitions within the muffler cavity divide it into multiple sub-cavities, and the inner core tubes on the inner partitions connect the various sub-cavities, creating a tortuous, labyrinthine exhaust gas passage. As the exhaust gas flows through this passage, its noise energy is largely absorbed, allowing the muffler assembly 4 to effectively reduce noise.

[0058] Based on the above configuration, through holes can also be provided on at least part of the inner baffle and the inner core tube wall. Providing through holes on part or all of the inner core tube wall and part or all of the inner baffle can enhance the exhaust gas flow efficiency and better eliminate noise, thereby further improving the noise reduction performance of the muffler assembly 4.

[0059] In specific implementation, three inner partitions—a first inner partition 404, a second inner partition 405, and a third inner partition 406—can be sequentially arranged from the first end cap 402 to the second end cap 403, thereby dividing the space into four chambers: a first silencing chamber 41, a second silencing chamber 42, a third silencing chamber 43, and a fourth silencing chamber 44. Preferably, a large number of through holes are densely arranged on the second inner partition 405 and the third inner partition 406. Three inner core tubes are preferably provided, specifically as follows: Figure 4 The first inner core tube 407, the second inner core tube 408, and the third inner core tube 409 shown are arranged along the axial direction of the outer shell 401 and are evenly distributed around the central axis of the outer shell 401. Multiple through holes are densely arranged on each of the three inner core tubes. The first inner core tube 407 passes through the first inner partition 404, the second inner partition 405, and the third inner partition 406. The second inner core tube 408 passes through the second inner partition 405 and the third inner partition 406. The third inner core tube 409 passes through the second inner partition 405 and the third inner partition 406. At the same time, the third inner core tube 409 passes through the second end cap 403 to connect to the exhaust pipe 5.

[0060] Based on the above exemplary embodiments, as a preferred combination of the exemplary solutions, refer to Figures 1 to 4 As shown, the following overall implementation scheme can be referred to when specifically implementing the exhaust gas purification and silencing device of this application:

[0061] The single exhaust gas purification and muffler device of this application mainly consists of an outer shell 401, an inner shell 304, a purification component 3, and a muffler component 4. The integrated purification muffler outer shell 401 includes a cylindrical main body and a first end cap 402 and a second end cap 403 respectively sealing both ends of the main body. Both the intake pipe 2 and the exhaust pipe 5 are mounted on the second end cap 403. The intake pipe 2 has an intake flange 1 at its end for connecting to the engine module. The purification component 3 and the muffler component 4 are integrated, and the exhaust pipe 5 connects to the outside atmosphere, allowing the exhaust gas generated by engine combustion to be discharged into the outside atmosphere after passing through the integrated catalytic converter 302, particulate filter 303, and muffler component 4.

[0062] A second conical tube 301 is provided at the air inlet end of the inner shell 304, which is connected to the air inlet pipe 2 and plays a role in guiding and diffusing exhaust gas. The air outlet end of the inner shell 304 is supported on the first end cover 402 through the first conical tube 307. The first conical tube 307 can serve as the boundary line between the silencing cavity and the inner cavity of the inner shell 304. Therefore, a certain number of through holes should be opened on the first conical tube 307.

[0063] The purification component 3 mainly consists of an inner shell 304, a catalyst 302 and a particulate filter 303 sequentially disposed within the inner shell 304, a first gasket 305 disposed between the inner shell 304 and the catalyst 302, a second gasket 306 disposed between the inner shell 304 and the particulate filter 303, and a heat insulation cover 308 covering the outside of the inner shell 304. The catalyst 302 and the particulate filter 303 are arranged in series in the direction of exhaust gas flow (which is also the axial direction of the inner shell 304). The second tapered tube 301 is connected to the intake pipe 2 and has a gradually expanding structure. The first tapered tube 307 is welded to the first end cap 402, and its structure is also a gradually expanding flared mouth structure. The expansion angle of the first tapered tube 307 is preferably set between 30° and 45°.

[0064] The heat insulation cover 308 is preferably made of aluminum sheet, and it can be fixed to the inner shell 304 by means of screwing, welding or other methods. The main function of the heat insulation cover 308 is to provide heat insulation for the catalyst 302 and the particulate filter 303, and to form a temperature isolation between the purification component 3 and the noise reduction component 4. On the other hand, the aluminum sheet has a good reflective heat insulation effect, which can shorten the ignition time in the purification component 3 and reduce the emission of pollutants such as CO and HC during the cold start stage.

[0065] The sound-absorbing component 4 is mainly composed of an outer shell 401, a first end cap 402, a second end cap 403, a first inner partition 404, a second inner partition 405, a third inner partition 406, a first inner core tube 407, a second inner core tube 408, and a third inner core tube 409. The outer shell 401 is a cylindrical structure, which can also be designed as a double-shell structure, including an inner shell fixedly fitted on the heat insulation cover 308 and an outer shell in contact with the outside atmosphere. The aforementioned annular inner partitions serve to connect and fix the inner shell and the outer shell.

[0066] The first end cap 402 is mainly used to block the exhaust gas after it has been treated by the purification component 3. The first end cap 402 is preferably designed to be concave towards the inner shell 304. In this way, when the exhaust gas from the purification component 3 impacts the first end cap 402, the convex structure of the first end cap 402 can disperse the airflow. The airflow is dispersed and guided, and flows into the silencing chamber through the through hole on the first tapered tube 307. Then it flows sequentially through the first silencing chamber 41, the first inner baffle 404, the second silencing chamber 42, the second inner baffle 405, the third silencing chamber 43, and the third inner baffle 406. The second inner baffle 405 and the third inner baffle 406 have multiple evenly distributed micro-through hole structures. The first inner core tube 407, the second inner core tube 408, and the third inner core tube 409 also have multiple evenly distributed micro-through hole structures in some sections, corresponding to different silencing chambers, to achieve different forms of noise elimination.

[0067] The muffler is divided into a first muffler 41, a second muffler 42, a third muffler 43, and a fourth muffler 44 according to the noise reduction path. Among them, the first muffler 41 and the second muffler 42 are resonant cavities, mainly used to eliminate low-frequency noise; the third muffler 43 is a high-frequency resonant cavity, which is filled with sound-absorbing cotton and is mainly used to eliminate high-frequency noise; the fourth muffler 44 is an expansion cavity, mainly used to eliminate mid- and low-frequency noise. The exhaust gas from the engine combustion passes through the catalytic converter 302 and the particulate filter 303 for purification, and then enters the first muffler 41 through the through-hole structure of the first conical tube 307, then enters the fourth muffler 44 through the first inner core tube 407, then enters the second muffler 42 through the second inner core tube 408, and finally is discharged into the external environment through the third inner core tube 409 and the exhaust pipe 5.

[0068] In summary, the exhaust gas purification and silencing device of this embodiment adopts a double-layered shell structure. The purification component 3 is set in the inner shell 304, and the silencing component 4 is set in the silencing cavity formed by the jacket space. This realizes the integrated purification and silencing functions of the exhaust gas emission system. The two major functions are integrated into a compact and continuous flow channel structure, which greatly reduces the length of the pipeline and the supporting pipeline flange connection structure in the exhaust gas emission system. This not only helps to reduce the system weight, but also helps to optimize the spatial layout and improve the utilization rate of the vehicle chassis space.

[0069] An embodiment of the second aspect of this application provides a vehicle equipped with the exhaust gas purification and muffler device provided in Embodiment 1.

[0070] By adopting the exhaust gas purification and silencing device of this application in the vehicle's exhaust emission system, a large number of redundant structures such as pipes and flanges are eliminated through the integrated flow channel design, achieving lightweight design and efficient thermal management. It can also optimize vehicle chassis space, reduce energy consumption, and meet the energy-saving requirements of new energy vehicles.

[0071] Compared to the problems of high heat loss, high heat radiation, and structural redundancy caused by the dispersed layout of traditional exhaust system components, the catalyst 302, particulate filter 303, and muffler assembly 4 in this application adopt an integrated solution. Through modular structural design, the three are integrated into a continuous flow channel system, significantly eliminating redundant flanges and connecting pipes and reducing system weight. The integrated layout also optimizes chassis space, improves the space utilization of the exhaust system, and reduces heat loss and heat radiation of high-temperature exhaust gas during long-path transmission. It achieves the dual goals of lightweight design improvement and thermal management effect improvement, which is in line with the technological trend of energy conservation and emission reduction in new energy vehicles.

[0072] The above description is merely a preferred embodiment of this application. Detailed explanations of configurations, examples of specific structural arrangements, and descriptions of assembly and connection methods are provided to ensure sufficient disclosure so that those skilled in the art can better implement this application, and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A tail gas purification and silencing device, characterized in that: It includes an outer housing (401) with an intake pipe (2) and an exhaust pipe (5), an inner housing (304) disposed inside the outer housing (401), and a purification component (3) and a noise reduction component (4). The air inlet of the inner housing (304) is connected to the outer housing (401) and communicates with the air inlet pipe (2); the air outlet of the inner housing (304) is located inside the outer housing (401) and communicates with the sound-absorbing cavity formed between the inner housing (304) and the outer housing (401). The purification component (3) is located inside the inner shell (304), and the silencing component (4) is located inside the silencing cavity. The exhaust gas entering through the intake pipe (2) flows through the purification component (3) and the silencing component (4) in sequence, and is discharged through the exhaust pipe (5).

2. The exhaust gas purification and silencing device according to claim 1, characterized in that: The outer shell (401) has a first end cap (402) and a second end cap (403) at both ends. The air inlet of the inner shell (304), the air inlet pipe (2) and the exhaust pipe (5) are all connected to the second end cap (403).

3. The exhaust gas purification and silencing device according to claim 2, characterized in that: Both the inner shell (304) and the outer shell (401) are cylindrical, and the inner shell (304) and the outer shell (401) are arranged coaxially. A first tapered tube (307) is provided between the air outlet end of the inner shell (304) and the first end cap (402). In the direction from the inner shell (304) to the first end cap (402), the radial dimension of the first tapered tube (307) is gradually increased, and a through hole is provided on the tube wall of the first tapered tube (307).

4. The exhaust gas purification and silencing device according to claim 3, characterized in that: The air intake pipe (2) is connected to the air intake end of the inner shell (304) through a second tapered pipe (301) with gradually increasing radial dimensions.

5. The exhaust gas purification and silencing device according to claim 2, characterized in that: The silencing component (4) includes a plurality of inner partitions and an inner core tube spaced apart within the silencing cavity; The inner partition divides the silencing cavity into multiple sub-cavities, and the inner core tube passes through the inner partition to connect each sub-cavity. The exhaust pipe (5) passes through the second end cap (403) and is connected to any of the inner core tubes.

6. The exhaust gas purification and silencing device according to claim 5, characterized in that: At least a portion of the inner partition and the inner core tube have through holes in their tube walls.

7. The exhaust gas purification and silencing device according to any one of claims 1 to 6, characterized in that: The purification component (3) includes a catalyst (302) and a particulate filter (303) arranged sequentially along the flow path of the exhaust gas.

8. The exhaust gas purification and silencing device according to claim 7, characterized in that: A first gasket (305) is provided between the catalyst (302) and the inner wall of the inner shell (304), and / or a second gasket (306) is provided between the particulate trap (303) and the inner wall of the inner shell (304).

9. The exhaust gas purification and silencing device according to claim 8, characterized in that: The inner shell (304) is covered with a heat insulation cover (308), and the sound-absorbing cavity is located outside the heat insulation cover (308).

10. A vehicle, characterized in that: The vehicle is equipped with an exhaust gas purification and muffler device as described in any one of claims 1 to 9.

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