Tail gas after-treatment device and vehicle

Abstract

The utility model provides a tail gas after-treatment device and a vehicle, the tail gas after-treatment device of the utility model relates to engine tail gas treatment technical field, and comprises a device shell, a tail gas treatment part and a heating structure, the device shell is provided with an accommodating cavity, and a gas inlet part and a gas outlet part connected to the two ends of the accommodating cavity, the tail gas treatment part is arranged in the containing cavity, the heating structure comprises a flow guide pipe and a heat exchange shell, a heat exchange cavity is defined between the heat exchange shell and the device shell, the heat exchange cavity is arranged adjacent to the containing cavity, and the flow guide pipe is connected between the gas outlet part and the heat exchange cavity, so that gas flowing through the heat exchange cavity from the flow guide pipe exchanges heat with the tail gas treatment part. According to the tail gas after-treatment device, the heating structure is arranged, and the temperature of the tail gas treatment part can be increased in a heat exchange mode, so that the treatment efficiency of the tail gas treatment part is improved, the tail gas treatment effect can be optimized, and pollutant emission is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of engine exhaust treatment technology, especially relates to a tail gas aftertreatment device. BACKGROUND

[0002] During the cold start and warm-up process of the automobile, the speed of the engine is very low, the vacuum degree of the intake pipe is very high, and the intake flow rate and temperature are both very low, which leads to poor gasoline atomization, poor evaporation, and difficulty in forming a uniform combustible mixture with air.

[0003] In order to smoothly start the vehicle, the fuel injection amount must be increased to provide a very rich mixture to the gasoline engine. In addition, due to the high concentration of residual exhaust gas in the engine cylinder and the low temperature of the combustion chamber, the engine combustion is very unstable, and misfire and other abnormal combustion phenomena are prone to occur, which generates a large amount of hydrocarbon and carbon monoxide emissions.

[0004] The existing tail gas aftertreatment device has excellent tail gas treatment performance only when it reaches a certain temperature (above 250°C). However, during the cold start and warm-up process of the automobile, the exhaust temperature is lower than the high-efficiency working temperature of the tail gas aftertreatment device, so the tail gas aftertreatment device has little effect on tail gas purification, which easily causes a large amount of hydrocarbon and carbon monoxide emissions. SUMMARY

[0005] Therefore, the utility model aims at providing a tail gas aftertreatment device to reduce pollutant emissions.

[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0007] A tail gas aftertreatment device, comprising a device shell, a tail gas treatment part, and a heating structure;

[0008] The device shell is provided with a containing cavity, and an air inlet and an air outlet connected to both ends of the containing cavity;

[0009] The tail gas treatment part is arranged in the containing cavity;

[0010] The heating structure comprises a flow guide pipe and a heat exchange shell, a heat exchange cavity is formed between the heat exchange shell and the device shell, and the heat exchange cavity is arranged adjacent to the containing cavity; the flow guide pipe is connected between the air outlet and the heat exchange cavity, so that the gas flowing through the heat exchange cavity from the flow guide pipe exchanges heat with the tail gas treatment part.

[0011] Further, the heat exchange cavity is arranged around the outer periphery of the containing cavity.

[0012] Further, the heat exchange cavity is provided with a partition plate, the partition plate separates the heat exchange cavity into a plurality of sub-cavities arranged in sequence along the flow direction of the airflow, and the partition plate is provided with a communication part for communicating adjacent sub-cavities.

[0013] Further, the flow guide pipe is provided with a first control valve, and the first control valve is used for opening and closing the flow guide channel in the flow guide pipe.

[0014] Further, the gas outlet is provided with a second control valve, and the second control valve is used for opening and closing the gas outlet channel in the gas outlet.

[0015] Along the flow direction of the airflow in the gas outlet, the second control valve is located downstream of the communication part of the flow guide pipe and the gas outlet.

[0016] Further, the communication part of the flow guide pipe and the heat exchange cavity is arranged close to the gas inlet; the heat exchange shell is provided with an exhaust port communicated with the heat exchange cavity, and the exhaust port is arranged close to the gas outlet.

[0017] Further, the tail gas treatment part includes a first tail gas treatment part and a second tail gas treatment part, the first tail gas treatment part and the second tail gas treatment part are arranged at intervals along the flow direction of the tail gas; a damping pad is arranged between the first tail gas treatment part and the side wall of the containing cavity, and between the second tail gas treatment part and the side wall of the containing cavity.

[0018] Further, the gas inlet is provided with a first mounting part for mounting a first oxygen sensor, and the first oxygen sensor is used for detecting the oxygen concentration in the airflow upstream of the first tail gas treatment part; the heat exchange shell is provided with a second mounting part for mounting a second oxygen sensor, and the second oxygen sensor is used for detecting the oxygen concentration in the airflow between the first tail gas treatment part and the second tail gas treatment part.

[0019] Further, the heat exchange shell is provided with a first connecting part connected with a differential pressure sensor, and the gas outlet is provided with a second connecting part connected with the differential pressure sensor, and the differential pressure sensor is used for detecting the pressure difference between the airflow upstream and downstream of the second tail gas treatment part.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] The tail gas post-processing device, the device shell can provide a closed working environment for the tail gas processing part, ensures that the tail gas can flow smoothly inside the device shell, and is treated through the tail gas processing part; the gas inlet part is used for receiving the tail gas to be treated, and the gas outlet part discharges the treated tail gas.

[0022] In addition, the arrangement of the heat exchange cavity around the outer periphery of the containing cavity means that the contact area between the tail gas processing part and the heat exchange cavity is larger, which helps to increase the surface area of heat exchange, thereby improving the heat exchange efficiency. By arranging the partition plate in the heat exchange cavity, the tail gas can be better distributed and mixed in the heat exchange cavity, and the heat exchange effect can be enhanced, thereby significantly improving the tail gas treatment effect.

[0023] In addition, the first control valve arranged on the flow guide pipe can completely close or open the flow guide channel in the flow guide pipe, thereby controlling whether the tail gas enters the heat exchange cavity for heat exchange. When the temperature of the tail gas processing part is high, the first control valve can be closed to cut off the flow of the tail gas, and when the temperature of the tail gas processing part is low, the first control valve can be opened, so that the tail gas flows through the heat exchange cavity to make the temperature of the tail gas processing part as high as possible, thereby improving the tail gas treatment effect.

[0024] The second control valve arranged on the gas outlet part can completely close or open the gas outlet channel in the gas outlet part, thereby controlling the discharge of the tail gas. When it is necessary to heat the tail gas processing part, the second control valve can be closed, so that all the tail gas flows through the heat exchange cavity, and the heating effect of the tail gas processing part can be improved. When it is not necessary to heat the tail gas processing part, the second control valve can be opened, and the amount of tail gas entering the heat exchange cavity can be reduced.

[0025] The communication part of the flow guide pipe and the heat exchange cavity is arranged close to the gas inlet part, so that the tail gas can be heat exchanged with the tail gas processing part as soon as possible after entering the heat exchange cavity. This design can increase the flow distance of the tail gas in the heat exchange cavity, thereby improving the heating effect of the tail gas processing part. The exhaust port on the heat exchange shell is arranged close to the gas outlet part, which means that the tail gas needs to flow through the entire heat exchange cavity before leaving the heat exchange cavity, which can ensure that the tail gas processing part is fully heated before leaving the heat exchange cavity, thereby further improving the heating effect of the tail gas processing part.

[0026] As for the exhaust treatment part including the first exhaust treatment part and the second exhaust treatment part arranged at intervals, the exhaust can be treated in stages, the first exhaust treatment part and the second exhaust treatment part can adopt different structures, so that different exhaust purification functions are realized, and the combination of the two can better remove harmful substances in the exhaust.

[0027] By arranging the first mounting portion and the second mounting portion, the first oxygen sensor and the second oxygen sensor are facilitated to be installed, and monitoring of the exhaust treatment process is facilitated, so that the exhaust treatment strategy is facilitated to be formulated. The first connecting portion and the second connecting portion are arranged, so that the differential pressure sensor is facilitated to be connected, so that the pressure difference between the upstream and downstream airflows of the second exhaust treatment portion is detected. According to the pressure difference detected by the differential pressure sensor, the exhaust treatment control system can adjust the working state, so as to optimize the exhaust treatment effect.

[0028] Another purpose of the utility model lies in providing a vehicle, and the engine exhaust system of the vehicle comprises the exhaust aftertreatment device.

[0029] The vehicle of the utility model, by applying the aforementioned exhaust aftertreatment device, the heating structure can improve the temperature of the exhaust treatment part in the mode of heat exchange, so as to improve the processing efficiency of the exhaust treatment part, the exhaust treatment effect can be optimized, and the pollutant emission is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings forming part of the utility model are used to provide further understanding of the utility model, and the illustrative embodiment of the utility model and the explanation thereof are used to explain the utility model and do not constitute undue limitation on the utility model. In the drawings:

[0031] Figure 1 It is a structural schematic view of the exhaust aftertreatment device of the utility model embodiment one;

[0032] Figure 2 It is a structural schematic view of the exhaust aftertreatment device of the utility model embodiment one; Figure 1 It is a sectional view along the line A-A;

[0033] Figure 3 It is a structural schematic view of the exhaust aftertreatment device of the utility model embodiment one without assembling the heat exchange shell.

[0034] BRIEF DESCRIPTION OF DRAWINGS:

[0035] 1, device shell; 2, exhaust treatment part; 3, heating structure; 4, air inlet; 5, air outlet; 6, first control valve; 7, second control valve; 8, first mounting portion; 9, second mounting portion; 10, first connecting portion; 11, second connecting portion; 12, first damping pad; 13, second damping pad;

[0036] 101, containing cavity;

[0037] 201, first tail gas treatment part; 202, second tail gas treatment part;

[0038] 301, flow guide pipe; 302, heat exchange shell; 303, partition plate; 304, exhaust port;

[0039] 3021, heat exchange cavity; 30211, sub-cavity; 3031, communication part;

[0040] 501, gas outlet end cone assembly; 502, gas outlet pipe;

[0041] a, first communication part; b, second communication part. DETAILED DESCRIPTION

[0042] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0043] In the description of the utility model, it should be noted that, based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the device or element indicated must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as a limitation of the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0044] In addition, in the description of the utility model, unless otherwise explicitly limited, the terms "mounting", "connecting", "connection", "connecting piece" should be understood broadly. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with specific circumstances.

[0045] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0046] Embodiment one

[0047] The embodiment relates to a tail gas aftertreatment device, which is provided with a heating structure, so that the tail gas treatment part can reach a high-efficiency working temperature as soon as possible, and the problems of large amounts of hydrocarbon and carbon monoxide emissions during cold start and warm-up stages of a vehicle can be improved.

[0048] Based on the above design idea, an exemplary structure of the tail gas aftertreatment device of the embodiment is as follows Figure 1 and Figure 2As shown, in the overall structure, the exhaust gas aftertreatment device of the embodiment mainly comprises a device shell 1, an exhaust gas treatment part 2 and a heating structure 3.

[0049] Among them, the device shell 1 is provided with a containing cavity 101, and an air inlet part 4 and an air outlet part 5 connected to both ends of the containing cavity 101. Specifically, the air inlet part 4 can be, for example, an existing air inlet end cone assembly, the inlet of the air inlet end cone assembly is connected with the outlet of the turbocharger in the engine exhaust system, and an air inlet channel is formed in the air inlet part 4. While the air outlet part 5 can be, for example, an existing air outlet end cone assembly 501, which is connected with the muffler in the engine exhaust system, and an air outlet channel is formed in the air outlet part 5.

[0050] Both ends of the aforementioned containing cavity 101 are provided with openings, and the air inlet channel and the air outlet channel are respectively communicated with the openings at both ends, so that the exhaust gas discharged through the turbocharger can pass through the air inlet channel, the containing cavity 101 and the air outlet channel in turn, and then enter the muffler for discharge.

[0051] The aforementioned exhaust gas treatment part 2 is arranged in the containing cavity 101, which is used for treating the airflow flowing through the containing cavity 101. It should be noted that the exhaust gas aftertreatment device in the embodiment can be, for example, an existing three-way catalytic converter, and the exhaust gas treatment part 2 mentioned here can be, for example, the exhaust gas treatment part 2 in the existing three-way catalytic converter. Since the exhaust gas treatment part 2 is coated with a catalyst, the catalyst has a good exhaust gas purification effect only when it reaches the light-off temperature.

[0052] It should be understood that the exhaust gas treatment part 2 of the embodiment can also be other existing exhaust gas treatment parts 2. In addition to being a three-way catalytic converter, the exhaust gas aftertreatment device can also be other structures, such as other devices that need high temperature to have a good exhaust gas purification effect. According to the description of the embodiment, the heating structure 3 can be added.

[0053] In terms of specific structure, still referring to Figure 1 and Figure 2 As shown, the heating structure 3 of the embodiment comprises a flow guide pipe 301 and a heat exchange shell 302, wherein a heat exchange cavity 3021 is formed between the heat exchange shell 302 and the device shell 1, and the heat exchange cavity 3021 is arranged adjacent to the containing cavity 101, and the flow guide pipe 301 is connected between the air outlet part 5 and the heat exchange cavity 3021, so that the gas flowing through the heat exchange cavity 3021 from the flow guide pipe 301 exchanges heat with the exhaust gas treatment part 2.

[0054] The exhaust gas aftertreatment device of the embodiment, when the exhaust gas is treated by the exhaust gas treatment part 2, can enter the heat exchange cavity 3021 through the flow guide pipe 301. In the heat exchange cavity 3021, the exhaust gas exchanges heat with the exhaust gas treatment part 2, and the heat is transferred to the exhaust gas treatment part 2. In this way, the exhaust gas treatment part 2 can maintain a high temperature during continuous operation, thereby improving the efficiency and effect of treating the exhaust gas.

[0055] As shown in Figure 2 and Figure 3 , as a preferred embodiment, the heat exchange cavity 3021 is arranged around the outer periphery of the containing cavity 101, and is arranged in such a way that the contact area between the exhaust gas treatment part 2 and the heat exchange cavity 3021 is larger, which helps to increase the heat exchange surface area, thereby improving the heat exchange efficiency.

[0056] For example, in the embodiment, the device housing 1 is cylindrical, and the heat exchange housing 302 is arranged outside the device housing 1 and forms a circular cylindrical heat exchange cavity 3021 with the device housing 1, which can better and fully exchange heat with the exhaust gas treatment part 2, so that the exhaust gas treatment part 2 can quickly reach the high-efficiency working temperature.

[0057] As shown in Figure 2 in combination with Figure 3 , as a preferred embodiment, the heat exchange cavity 3021 is provided with a partition plate 303, which divides the heat exchange cavity 3021 into a plurality of sub-cavities 30211 arranged in sequence along the flow direction of the gas flow, and the partition plate 303 is provided with a communication part 3031 for communicating adjacent sub-cavities 30211. In this structure, by arranging the partition plate 303 in the heat exchange cavity 3021, the exhaust gas can be better distributed and mixed in the heat exchange cavity 3021, and the flow rate of the exhaust gas can be limited, thereby enhancing the heat exchange effect and significantly improving the exhaust gas treatment effect.

[0058] In a preferred embodiment, the communication part 3031 includes a plurality of communication ports provided on the partition plate 303, and the plurality of communication ports are distributed at intervals in the circumferential direction of the containing cavity 101. As in the embodiment, the communication ports are circular, and the plurality of communication ports are uniformly distributed at intervals in the circumferential direction of the containing cavity 101, which is beneficial to the balanced flow of the gas flow, thereby facilitating uniform heating of the exhaust gas treatment part 2.

[0059] It should be understood that the shape of the communication port can be other than circular, such as triangular, square, strip-shaped, etc., and the plurality of communication ports can also be distributed at uneven intervals in the circumferential direction of the containing cavity 101. The number of communication ports is not specifically limited in the present embodiment.

[0060] Still referring to Figure 1 and Figure 2As shown, as a preferred embodiment, the flow guide pipe 301 is provided with a first control valve 6, which is used to open or close the flow guide passage in the flow guide pipe 301. The first control valve 6 provided in this way can completely close or open the flow guide passage in the flow guide pipe 301, so as to control whether the exhaust gas enters the heat exchange cavity 3021 to exchange heat.

[0061] When the exhaust gas treatment part 2 is at a high temperature, the first control valve 6 can be closed to cut off the flow of the exhaust gas, and when the exhaust gas treatment part 2 is at a low temperature, the first control valve 6 can be opened to make the exhaust gas flow through the heat exchange cavity 3021, so that the temperature of the exhaust gas treatment part 2 can be quickly increased, thereby improving the exhaust gas treatment effect.

[0062] It should be noted that, in the exhaust gas aftertreatment device of the embodiment, since the exhaust gas is discharged to the muffler through the gas outlet part 5, and the pressure in the muffler is relatively large, when the first control valve 6 is opened, a large amount of exhaust gas can flow into the heat exchange cavity 3021 through the flow guide pipe 301.

[0063] In addition, in the preferred embodiment, the second control valve 7 is arranged at a position close to the gas outlet part 5 of the flow guide pipe 301, which can better control the flow direction of the exhaust gas. It should be understood that the second control valve 7 can also be arranged at other positions of the flow guide pipe 301.

[0064] As shown in Figure 1 and Figure 2 As shown, as a preferred embodiment, the gas outlet part 5 is provided with a second control valve 7, which is used to open or close the gas outlet passage in the gas outlet part 5, and the second control valve 7 is located downstream of the communication position of the flow guide pipe 301 and the gas outlet part 5 along the flow direction of the gas flow in the gas outlet part 5.

[0065] In the above structure, the second control valve 7 provided can completely close or open the gas outlet passage in the gas outlet part 5, so as to control the exhaust gas discharge. When the exhaust gas treatment part 2 needs to be heated, the second control valve 7 can be closed, so that all the exhaust gas flows through the heat exchange cavity 3021, thereby better improving the heating effect of the exhaust gas treatment part 2. When the exhaust gas treatment part 2 does not need to be heated, the second control valve 7 can be opened, thereby reducing the exhaust gas entering the heat exchange cavity 3021.

[0066] It should be noted that, in the embodiment, the second control valve 7 is provided, which can conveniently control the flow direction of the exhaust gas. It should be understood that, since the pressure in the muffler is relatively large, when the first control valve 6 is opened, most of the gas flow can flow to the heat exchange cavity 3021 through the flow guide pipe 301 without the second control valve 7.

[0067] As shown in Figure 3As shown, as a preferred embodiment, the communication part of the flow guide pipe 301 and the heat exchange cavity 3021, i.e. the first communication part a, is arranged close to the air inlet part 4, so that the exhaust gas can be heated as early as possible by the exhaust gas treatment part 2 after entering the heat exchange cavity 3021. This design can increase the flow distance of the exhaust gas in the heat exchange cavity 3021, thereby improving the heating effect on the exhaust gas treatment part 2.

[0068] By Figure 1 In combination Figure 3 As shown, as a preferred embodiment, the heat exchange shell 302 is provided with an exhaust port 304 communicating with the heat exchange cavity 3021, and the exhaust port 304 is arranged close to the air outlet part 5. In this way, the exhaust gas needs to flow through the entire heat exchange cavity 3021 before leaving the heat exchange cavity 3021, which can ensure that the exhaust gas treatment part 2 is fully heated before the exhaust gas leaves the heat exchange cavity 3021, thereby further improving the heating effect on the exhaust gas treatment part 2.

[0069] As in the present embodiment, the communication part of the exhaust port 304 is provided with an exhaust pipe, and the end of the exhaust pipe away from the exhaust port 304 communicates with the atmosphere, so that the gas flow entering the heat exchange cavity 3021 through the flow guide pipe 301 can be discharged through the exhaust port 304.

[0070] As a preferred embodiment, the air outlet part 5 of the present embodiment further comprises an air outlet pipe 502 connected with the air outlet end cone assembly 501, and the communication part of the flow guide pipe 301 with the air outlet part 5, i.e. the second communication part b, is specifically located on the air outlet pipe 502, which facilitates overall arrangement.

[0071] As a preferred embodiment, as Figure 2 As shown, the aforementioned exhaust gas treatment part 2 comprises a first exhaust gas treatment part 201 and a second exhaust gas treatment part 202, and the first exhaust gas treatment part 201 and the second exhaust gas treatment part 202 are arranged at intervals along the flow direction of the exhaust gas.

[0072] Here, the exhaust gas treatment part 2 comprises the first exhaust gas treatment part 201 and the second exhaust gas treatment part 202 arranged at intervals, which can realize staged treatment of the exhaust gas. The first exhaust gas treatment part 201 and the second exhaust gas treatment part 202 can adopt different structures to realize different exhaust gas purification functions, and the combination of the two can better remove harmful substances in the exhaust gas. The specific structures of the first exhaust gas treatment part 201 and the second exhaust gas treatment part 202 can refer to the prior art.

[0073] Continuing to refer to Figure 2 As shown, a damping pad is arranged between the first exhaust gas treatment part 201 and the side wall of the containing cavity 101, and between the second exhaust gas treatment part 202 and the side wall of the containing cavity 101. As Figure 2As shown, the damping pad between the first exhaust treatment part 201 and the side wall of the accommodating cavity 101 is the first damping pad 12, and the damping pad between the second exhaust treatment part 202 and the side wall of the accommodating cavity 101 is the second damping pad 13.

[0074] The first damping pad 12 and the second damping pad 13 are both sleeve-shaped, the first damping pad 12 is sleeved outside the cylindrical first exhaust treatment part 201, and the second damping pad 13 is sleeved outside the cylindrical second exhaust treatment part 202, which has a good damping effect.

[0075] As shown in Figure 1 and Figure 2 As a preferred embodiment, the first mounting part 8 for mounting the first oxygen sensor for detecting the oxygen concentration in the gas flow upstream of the first exhaust treatment part 201 is arranged on the gas inlet part 4.

[0076] At the same time, as a preferred embodiment, the second mounting part 9 for mounting the second oxygen sensor for detecting the oxygen concentration in the gas flow between the first exhaust treatment part 201 and the second exhaust treatment part 202 is arranged on the heat exchange shell 302.

[0077] In the above structure, by arranging the first mounting part 8 and the second mounting part 9, the first oxygen sensor and the second oxygen sensor are facilitated to be mounted, which is beneficial to realize the monitoring of the exhaust treatment process, thereby facilitating the development of the exhaust treatment strategy.

[0078] It should be noted that the structure of the first mounting part 8 and the second mounting part 9 in the embodiment can refer to the existing oxygen sensor mounting seat, which will not be described in detail here. In addition, as in the embodiment, the second mounting part 9 further includes a sleeve, which is arranged in the corresponding hole of the device shell 1 and the heat exchange shell 302, and the outer wall of the sleeve is sealingly connected with the device shell 1 and the heat exchange shell 302, so that the oxygen sensor can detect the oxygen concentration in the gas flow between the first exhaust treatment part 201 and the second exhaust treatment part 202, and the existing oxygen sensor mounting seat can be connected with the sleeve.

[0079] Still referring to Figure 1 and Figure 2 As a preferred embodiment, the first connecting part 10 for connecting the differential pressure sensor is arranged on the heat exchange shell 302, and the second connecting part 11 for connecting the differential pressure sensor is arranged on the gas outlet part 5, and the differential pressure sensor is used to detect the pressure difference between the upstream gas flow and the downstream gas flow of the second exhaust treatment part 202. Specifically, the first connecting part 10 is used to connect the high-pressure pipeline of the differential pressure sensor, and the second connecting part 11 is used to connect the low-pressure pipeline of the differential pressure sensor.

[0080] The first connecting part 10 and the second connecting part 11 are arranged to facilitate the connection with the differential pressure sensor, so as to facilitate the detection of the pressure difference between the gas flows upstream and downstream of the second tail gas treatment part 202. According to the pressure difference detected by the differential pressure sensor, the tail gas treatment control system can adjust the working state to optimize the tail gas treatment effect.

[0081] It should be noted that in this embodiment, the structure of the first connecting part 10 and the second connecting part 11 can refer to the existing differential pressure sensor connecting seat. In addition, as in this embodiment, the first connecting part 10 includes a sleeve that is arranged in the corresponding openings of the device housing 1 and the heat exchange housing 302, and the outer wall of the sleeve is sealingly connected with the device housing 1 and the heat exchange housing 302, so that the differential pressure sensor can obtain the pressure of the gas flow between the first tail gas treatment part 201 and the second tail gas treatment part 202, and the existing differential pressure sensor connecting seat is connected with the sleeve.

[0082] The tail gas aftertreatment device of the present embodiment can realize heating of the tail gas treatment part 2 by using the heat conduction principle, without the need for an external heat source, so that the tail gas treatment part 2 can quickly reach an efficient working temperature, thereby reducing the emission of hydrocarbons and carbon monoxide during cold start and warm-up, and thereby benefiting the environment.

[0083] The tail gas aftertreatment device of the present embodiment provides a closed working environment for the tail gas treatment part 2, and ensures that the tail gas can flow smoothly inside the device housing 1 and be treated by the tail gas treatment part 2. The gas inlet part 4 is used to receive the tail gas to be treated, and the gas outlet part 5 is used to discharge the treated tail gas. The heating structure 3 can increase the temperature of the tail gas treatment part 2 by heat exchange, thereby improving the processing efficiency of the tail gas treatment part 2, optimizing the tail gas treatment effect, and reducing pollutant emissions.

[0084] Embodiment two

[0085] The present embodiment relates to a vehicle, and the engine exhaust system of the vehicle comprises the tail gas aftertreatment device as in embodiment one.

[0086] The vehicle of the present embodiment has the same beneficial effects as the tail gas aftertreatment device of embodiment one relative to the prior art, and will not be described here.

[0087] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A tail gas aftertreatment device characterized in that: comprising a device housing (1), a tail gas treatment part (2) and a heating structure (3); the device housing (1) is provided with a containing cavity (101), and an air inlet part (4) and an air outlet part (5) connected to both ends of the containing cavity (101); the tail gas treatment part (2) is arranged in the containing cavity (101); the heating structure (3) comprises a flow guide pipe (301) and a heat exchange shell (302), a heat exchange cavity (3021) is formed between the heat exchange shell (302) and the device housing (1), and the heat exchange cavity (3021) is arranged adjacent to the containing cavity (101); the flow guide pipe (301) is connected between the air outlet part (5) and the heat exchange cavity (3021), so that the gas flowing from the flow guide pipe (301) to the heat exchange cavity (3021) can exchange heat with the tail gas treatment part (2); the heat exchange cavity (3021) is provided with a partition plate (303), the partition plate (303) divides the heat exchange cavity (3021) into a plurality of sub-cavities (30211) arranged in sequence along the flow direction of the gas flow, and the partition plate (303) is provided with a communication part (3031) for communicating adjacent sub-cavities (30211); the communication part (3031) comprises a plurality of communication openings arranged on the partition plate (303), and a plurality of the communication openings are distributed at intervals in the circumferential direction of the containing cavity (101).

2. The tail gas aftertreatment device according to claim 1, characterized in that: the heat exchange cavity (3021) is arranged around the outer periphery of the containing cavity (101).

3. The tail gas aftertreatment device according to claim 1, characterized in that: the flow guide pipe (301) is provided with a first control valve (6), and the first control valve (6) is used to open and close the flow guide channel in the flow guide pipe (301).

4. The tail gas aftertreatment device according to claim 1, characterized in that: the air outlet part (5) is provided with a second control valve (7), and the second control valve (7) is used to open and close the air outlet channel in the air outlet part (5); along the flow direction of the gas flow in the air outlet part (5), the second control valve (7) is located downstream of the communication part between the flow guide pipe (301) and the air outlet part (5).

5. The tail gas aftertreatment device according to claim 1, characterized in that: the communication part between the flow guide pipe (301) and the heat exchange cavity (3021) is arranged close to the air inlet part (4); the heat exchange shell (302) is provided with an exhaust port (304) communicating with the heat exchange cavity (3021), and the exhaust port (304) is arranged close to the air outlet part (5).

6. The tail gas aftertreatment device according to any one of claims 1-5, characterized in that: the tail gas treatment part (2) comprises a first tail gas treatment part (201) and a second tail gas treatment part (202), and the first tail gas treatment part (201) and the second tail gas treatment part (202) are arranged at intervals along the flow direction of the tail gas. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ A damping pad is arranged between the first exhaust gas treatment part (201) and the side wall of the accommodating cavity (101), and between the second exhaust gas treatment part (202) and the side wall of the accommodating cavity (101).

7. The exhaust gas aftertreatment device according to claim 6, characterized in that: A first mounting part (8) for mounting a first oxygen sensor is arranged on the intake part (4), and the first oxygen sensor is used to detect the oxygen concentration in the gas flow upstream of the first exhaust gas treatment part (201); A second mounting part (9) for mounting a second oxygen sensor is arranged on the heat exchange housing (302), and the second oxygen sensor is used to detect the oxygen concentration in the gas flow between the first exhaust gas treatment part (201) and the second exhaust gas treatment part (202).

8. The exhaust gas aftertreatment device according to claim 6, characterized in that: A first connecting part (10) for connecting a differential pressure sensor is arranged on the heat exchange housing (302), and a second connecting part (11) for connecting the differential pressure sensor is arranged on the outlet part (5), and the differential pressure sensor is used to detect the pressure difference between the upstream gas flow and the downstream gas flow of the second exhaust gas treatment part (202).

9. A vehicle, characterized in that: The engine exhaust system of the vehicle comprises the exhaust gas aftertreatment device according to any one of claims 1-8.

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