Motor vehicle tail gas treatment device

Abstract

The invention relates to the technical field of waste gas treatment, and discloses a motor vehicle tail gas treatment device which comprises a mounting plate, a gas conveying pipe is arranged on the mounting plate, a catalysis pipe is fixedly mounted at one end of the gas conveying pipe, a catalyst is arranged in the catalysis pipe, and a plurality of evenly-distributed gas inlet pipes are arranged at the end, close to the gas conveying pipe, of the catalyst. A plurality of first communicating cavities, a plurality of extension pipes and a plurality of second communicating cavities are formed in the catalytic converter, a plurality of air outlet pipes are arranged in the catalytic converter, one ends of the air outlet pipes are communicated with the second communicating cavities, and the other ends of the air outlet pipes penetrate through the catalytic converter. By improving the structure of the catalytic converter, the flowing distance of tail gas in the catalytic converter is prolonged, the catalytic conversion efficiency is improved, residues of harmful substances in the tail gas are reduced, and when the tail gas flows into the first communicating cavity and the second communicating cavity, gas originally located in the center moves to the outer side and makes full contact with the inner wall of the catalytic converter; and the tail gas catalytic reaction is more sufficient.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas treatment technology, and in particular to a motor vehicle exhaust gas treatment device. Background Technology

[0002] Currently, catalytic conversion devices are commonly used, which utilize catalysts to convert carbon monoxide into carbon dioxide, hydrocarbons, and nitrogen oxides, which are then decomposed into harmless gases.

[0003] A search revealed that Chinese patent CN110617126A discloses a device for treating and reducing noise in motor vehicle exhaust. The device includes a horizontally arranged annular columnar catalytic chamber housing a three-way catalytic converter. At the left end of the catalytic chamber, a desulfurization chamber with a conical annular structure and a lead removal chamber with an annular columnar structure are sequentially arranged. Fixed flanges are sealed and fixed to the left and right ends of the lead removal chamber, desulfurization chamber, and catalytic chamber. A connecting mechanism is provided on the fixed flange at the left end of the catalytic chamber, and the mechanism is sealed and fixed to the fixed flange at the adjacent end of the desulfurization chamber. This invention allows for convenient replacement of the raw materials in the desulfurization and lead removal chambers, facilitating maintenance and reducing repair costs. This makes desulfurization and lead removal in engine exhaust feasible in practical applications and indirectly improves the purification efficiency and extends the service life of the three-way catalytic converter. The treated exhaust gas is discharged from a straight-pipe muffler at the end of the device, reducing vehicle noise. However, this solution still has the following shortcomings in practical use: However, the main pollutants in motor vehicle exhaust include carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx). These gases can be converted into harmless carbon dioxide, nitrogen, and water under the action of a catalyst. Achieving efficient catalysis requires strict conditions. Usually, exhaust gas is purified by passing it through a primary catalytic converter. However, due to the high exhaust gas emission speed, it is difficult to guarantee sufficient reaction time. When the exhaust gas flows through the catalytic converter, the outer part that contacts the catalytic converter is preferentially converted, while the inner part cannot fully contact the catalytic converter surface, resulting in incomplete reaction. Furthermore, excessively reducing the diameter of the exhaust pipe to ensure sufficient reaction can lead to exhaust gas blockage, increase exhaust pipe pressure, and thus create safety risks. In addition, the optimal temperature for catalysis is usually 400°C to 800°C. However, when the engine is first started, the exhaust temperature is low, and it usually takes several kilometers to reach the effective operating temperature above 400°C. In high-traffic scenarios such as commuting to and from get off work, prolonged idling or frequent short-distance driving can result in insufficient catalytic temperature, leading to decreased purification efficiency and increased exhaust pollutant emissions.

[0004] Therefore, it is necessary to design a vehicle exhaust treatment device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a motor vehicle exhaust gas treatment device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A motor vehicle exhaust gas treatment device includes a mounting plate, a pipe rack fixedly mounted on the mounting plate, an air supply pipe fixedly mounted on the pipe rack, a catalytic converter fixedly mounted at one end of the air supply pipe, an exhaust pipe fixedly mounted at the other end of the catalytic converter, a catalytic converter disposed in the catalytic converter, a plurality of evenly distributed air intake pipes opened at the end of the catalytic converter near the air supply pipe, the length of the air intake pipes being less than the length of the catalytic converter, a plurality of coaxially arranged connecting cavities I within the catalytic converter located at the end of the air intake pipes near the exhaust pipe, a plurality of extension pipes connected to the connecting cavities I within the catalytic converter pointing towards the air supply pipes, the other end of the extension pipes located within the catalytic converter and a plurality of connecting cavities II within the catalytic converter located at the other end of the extension pipes, and a plurality of exhaust pipes within the catalytic converter, one end of the exhaust pipe connected to the connecting cavity II and the other end penetrating through the catalytic converter; Two semi-circular friction plates are slidably mounted on the gas pipeline. A connecting mechanism and a driving mechanism are provided on the friction plates. A cooling component is provided on the gas pipeline.

[0007] As a preferred embodiment of the present invention, a conical guide block is fixedly installed in both the first and second connecting cavities. The tip of the conical guide block in the first connecting cavity points to the air intake pipe, and the tip of the conical guide block in the second connecting cavity points to the extension pipe.

[0008] As a preferred embodiment of the present invention, the sidewall of the tapered guide block is provided with an inwardly concave arc.

[0009] As a preferred embodiment of the present invention, the connecting mechanism includes connecting seats fixedly installed at the four corners of the friction plates. The two friction plates are arranged opposite to each other. An electric telescopic rod is provided on the connecting seat of one friction plate, and a screw is fixedly installed at one end of the electric telescopic rod that passes through the connecting seat. A nut is threadedly installed at one end of the screw that passes through the connecting seat of the other friction plate.

[0010] As a preferred embodiment of the present invention, the driving assembly includes a semi-toothed ring fixedly mounted on the friction plate, a driving motor fixedly mounted on the mounting plate, and a gear meshing with the semi-toothed ring fixedly mounted at the output end of the driving motor.

[0011] As a preferred embodiment of the present invention, the gas delivery pipe and the friction plate are made of copper alloy at the corresponding positions, and the gas delivery pipe and the friction plate are provided with frosted surfaces at the corresponding positions.

[0012] As a preferred embodiment of the present invention, a plurality of trapezoidal friction platforms are fixedly installed on the gas pipeline, and friction grooves adapted to the friction platforms are formed on the inner sidewall of the friction plate.

[0013] As a preferred embodiment of the present invention, the cooling assembly includes a water-cooled pipe fitted on the gas supply pipe, a water tank is fixedly installed on the mounting plate, the two ends of the water-cooled pipe are respectively connected to the top and bottom of the water tank, and a water pump is directly connected to the water-cooled pipe located at the bottom of the water tank and the water tank, and a heat dissipation assembly is provided on the water tank.

[0014] As a preferred embodiment of the present invention, the heat dissipation assembly includes a heat dissipation frame fixedly installed in front of the water tank, a crossbar fixedly installed on the heat dissipation frame, and a plurality of air guide plates symmetrically and rotatably installed between the crossbar and the bottom of the heat dissipation frame. A rotating rod is fixedly installed at one end of the rotating shaft of the air guide plate extending out of the crossbar. A connecting rod is provided at the other end of the rotating rod located on one side of the heat dissipation frame, and the rotating rod is rotatably connected to the connecting rod. A linkage mechanism is provided on the connecting rod.

[0015] As a preferred embodiment of the present invention, the linkage mechanism includes two electric telescopic rods symmetrically fixedly installed on the heat sink frame. An L-shaped telescopic arm is fixedly installed on the movable end of the electric telescopic rod. A clearance groove is provided on the telescopic arm. A fixed rod extending into the clearance groove is fixedly installed on the connecting rod. The fixed rod is slidably connected to the clearance groove.

[0016] The present invention has the following beneficial effects: 1. In this invention, by improving the catalyst structure and setting up an inlet pipe, a connecting chamber one, an extension pipe, a connecting chamber two, and an outlet pipe, the flow distance of the exhaust gas in the catalyst is extended, thereby increasing the catalytic reaction time, improving the catalytic conversion efficiency, and reducing the residue of harmful substances in the exhaust gas. When the exhaust gas flows into the connecting chamber one and the connecting chamber two, it collides with the inner wall of the chamber, causing the gas part that was originally located in the center of the pipe to move to the outside and fully contact the inner wall of the catalyst to carry out the catalytic reaction, making the catalytic reaction of the exhaust gas more complete. Moreover, better catalytic effect can be achieved without increasing the size of the catalyst. Superior catalytic effect is achieved in a limited space, and the application range is wider. 2. In this invention, the heat generated by the rapid friction between the friction plate and the gas pipeline is used to heat the exhaust gas, thereby increasing the catalytic reaction temperature and ensuring that the catalytic reaction proceeds fully at the ideal temperature, thus improving the pollutant treatment efficiency. The copper alloy pipeline can improve the heat conduction efficiency. The design of the frosted surface, friction table, and friction groove further enhances the friction heating effect. In addition, the electric telescopic rod can adjust the pressure between the friction plate and the gas pipeline according to the exhaust gas temperature, flexibly controlling the friction heating effect and saving driving force. 3. In this invention, when the exhaust gas temperature is too high, the water pump pumps the coolant in the water tank into the water-cooled pipe wrapped around the gas delivery pipe for circulation. The exhaust gas is cooled through rapid heat conduction to meet the appropriate temperature required for catalysis. At the same time, it can cause solid particles to settle and avoid clogging the catalytic converter. The relative airflow brought by the vehicle's forward movement exchanges heat with the water tank to cool it down, maintaining the coolant circulation. The electric telescopic rod can adjust the angle of the air guide plate to direct more air to the water tank, improve the cooling speed, and realize the regulation of the cooling system circulation to meet different cooling needs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a motor vehicle exhaust gas treatment device proposed in this invention; Figure 2 This is a partial structural schematic diagram of a motor vehicle exhaust gas treatment device proposed in this invention; Figure 3 This is a schematic diagram of the structure of the catalytic converter tube of a motor vehicle exhaust gas treatment device proposed in this invention; Figure 4 This is a cross-sectional view of the catalytic converter tube of a motor vehicle exhaust treatment device proposed in this invention. Figure 5 for Figure 4 Enlarged structural diagram at point A; Figure 6 This is a partial exploded structural diagram of a motor vehicle exhaust gas treatment device proposed in this invention; Figure 7 for Figure 1 An enlarged structural diagram at point B in the middle; Figure 8 This is a schematic diagram of the cooling assembly of a motor vehicle exhaust gas treatment device proposed in this invention; Figure 9 This is a schematic diagram of the telescopic arm of a motor vehicle exhaust gas treatment device proposed in this invention; Figure 10 for Figure 8 A magnified structural diagram at point C.

[0018] In the diagram: 1. Mounting plate; 2. Pipe rack; 3. Gas supply pipe; 31. Catalytic converter pipe; 32. Exhaust pipe; 33. Catalyst; 34. Intake pipe; 35. Connecting cavity one; 36. Extension pipe; 37. Connecting cavity two; 38. Gas outlet pipe; 39. Conical guide block; 4. Friction plate; 41. Semi-tooth ring; 42. Connecting seat; 43. Electric telescopic rod one; 44. Screw; 45. Nut; 46. Friction table; 47. Friction groove; 48. Drive motor; 49. Gear; 5. Water cooling pipe; 51. Water tank; 52. Water pump; 53. Heat sink; 54. Crossbar; 55. Air guide plate; 56. Rotating rod; 57. Connecting rod; 58. Electric telescopic rod two; 59. Telescopic arm; 510. Clearance groove; 511. Fixing rod. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1 This embodiment discloses a motor vehicle exhaust gas treatment device, referring to... Figures 1 to 10 The system includes a mounting plate 1, a pipe bracket 2 fixedly mounted on the mounting plate 1, a gas supply pipe 3 fixedly mounted on the pipe bracket 2, a catalytic converter 31 fixedly mounted at one end of the gas supply pipe 3, and an exhaust pipe 32 fixedly mounted at the other end of the catalytic converter 31. A catalytic converter 33 is installed within the catalytic converter 31. Several evenly distributed intake pipes 34 are provided at the end of the catalytic converter 33 closest to the gas supply pipe 3. The length of each intake pipe 34 is less than the length of the catalytic converter 33. The catalytic converter 33 is located within the intake pipes 34 near the exhaust pipes 32. The catalyst 33 has several connecting cavities 35 coaxially arranged with the intake pipe 34. The catalyst 33 has several extension pipes 36 connected to the connecting cavities 35 and pointing towards the gas supply pipe 3. The other end of the extension pipe 36 is located inside the catalyst 33, and several connecting cavities 37 are opened inside the catalyst 33 at the other end of the extension pipe 36. The catalyst 33 has several exhaust pipes 38. One end of the exhaust pipe 38 is connected to the connecting cavity 37, and the other end passes through the catalyst 33. Two semi-circular friction plates 4 are slidably installed on the gas pipeline 3. The friction plates 4 are equipped with a connecting mechanism and a driving mechanism. The gas pipeline 3 is equipped with a cooling component.

[0021] The implementation principle of this embodiment is as follows: The exhaust gas produced by the automobile contains a large amount of pollutants such as carbon monoxide, hydrocarbons, and nitrogen oxides. Before these pollutants are emitted into the atmosphere, they need to be treated to eliminate pollution. First, the exhaust gas is transmitted to the catalytic converter 31 through the gas inlet pipe 3. The catalytic converter 33 in the catalytic converter 31 uses precious metal catalysts such as platinum, rhodium, and palladium to catalyze the pollutants in the exhaust gas, converting them into substances such as carbon dioxide, nitrogen, and water. The exhaust gas first flows into the catalytic converter 33 through the intake pipe 34. Under the catalytic action of the catalytic substances on the inner wall of the intake pipe 34, the part of the exhaust gas that is in contact with the surface of the intake pipe 34 is catalyzed and converted into harmless substances. When it moves to the other end of the catalytic converter 33, under the action of the connecting cavity 35, the exhaust gas does not flow directly out of the catalytic converter 33, but flows into the extension pipe 36 connected to the connecting cavity 35. The exhaust gas can continue to undergo catalytic reaction while flowing in the extension pipe 36. When it flows to the end of the extension pipe 36, it enters the connecting cavity 2. 37, and then flows into the exhaust pipe 38, where it continuously contacts the inner wall of the catalyst 33, thereby continuously catalyzing the conversion of harmful gases into harmless gases. Finally, the exhaust gas flows out from the catalyst pipe 31 and enters the exhaust pipe 32 for discharge. By extending the flow distance of the exhaust gas in the catalyst 33, the catalytic reaction time of the exhaust gas is extended, thereby improving the efficiency of catalytic conversion, reducing the residue of harmful substances in the exhaust gas, and achieving better catalytic effect without setting the size of the catalyst 33 too large. It is more suitable for small vehicles with compact space. Through the setting of connecting cavity one 35 and connecting cavity two 37, the exhaust gas will collide with the inner wall of the cavity when it flows into connecting cavity one 35 and connecting cavity two 37, and then mix. This allows the gas part that was originally located in the center of the pipe to move to the outside after collision and mixing, so that it can fully contact the inner wall of the catalyst 33 and carry out the catalytic reaction, making the catalytic reaction of the exhaust gas more complete, improving the gas purification effect, and reducing the residue of harmful substances.

[0022] Example 2 Based on Example 1, this example discloses a motor vehicle exhaust treatment device, such as... Figure 5 As shown, conical guide blocks 39 are fixedly installed in both the first connecting cavity 35 and the second connecting cavity 37. The tip of the conical guide block 39 in the first connecting cavity 35 points to the air intake pipe 34, and the tip of the conical guide block 39 in the second connecting cavity 37 points to the extension pipe 36. The side wall of the conical guide block 39 is provided with an inwardly concave arc.

[0023] The implementation principle of this embodiment is as follows: When the exhaust gas flows into the connecting chamber 35 and the connecting chamber 37 along the pipeline, it first comes into contact with the conical guide block 39. Under the action of the conical guide block 39 and its concave arc-shaped slope, the exhaust gas is dispersed to the surrounding area, so that the gas originally located on the inside is located on the outside of the airflow after dispersion. Then, when it flows into the extension pipe 36 or the outlet pipe 38, it can fully contact the catalyst 33 to achieve a full purification effect. Moreover, the gas flow is smoother due to the guiding effect of the arc-shaped surface on the gas.

[0024] Example 3 Based on Example 1, this example discloses a motor vehicle exhaust treatment device, such as... Figure 6 and Figure 7 As shown, the connecting mechanism includes connecting seats 42 fixedly installed at the four corners of the friction plates 4. The two friction plates 4 are arranged opposite each other. An electric telescopic rod 43 passing through the connecting seat 42 is provided on the connecting seat 42 of one friction plate 4. A screw 44 is fixedly installed at one end of the electric telescopic rod 43 passing through the connecting seat 42. A nut 45 is threadedly installed at one end of the screw 44 passing through the connecting seat 42 of the other friction plate 4. The driving assembly includes a semi-tooth ring 41 fixedly installed on the friction plate 4. A drive motor 48 is fixedly installed on the mounting plate 1. A gear 49 meshing with the semi-tooth ring 41 is fixedly installed at the output end of the drive motor 48. The air supply pipe 3 is made of copper alloy at the position corresponding to the friction plate 4. A frosted surface is provided at the corresponding position on the air supply pipe 3 and the friction plate 4. Several trapezoidal friction platforms 46 are fixedly installed on the air supply pipe 3. Friction grooves 47 adapted to the friction platforms 46 are opened on the inner side wall of the friction plate 4.

[0025] The implementation principle of this embodiment is as follows: When the car idles for a long time or frequently travels short distances, the drive motor 48 is started to drive the gear 49 to rotate, which in turn drives the two half-tooth rings 41 meshing with the gear 49 to rotate. This, in turn, drives the friction structure composed of two friction plates 4 mounted on the air supply pipe 3 to rotate along the air supply pipe 3. The friction between the friction plates 4 and the air supply pipe 3 generates heat to heat the underheated exhaust gas, thereby increasing the temperature during the catalytic reaction and ensuring that the catalytic reaction proceeds fully. This improves the efficiency of pollutant treatment in the exhaust gas. The use of a copper alloy pipe can improve heat conduction efficiency, allowing the exhaust gas to heat up quickly. The frosted surface can improve the efficiency of friction heating and provide sufficient heating effect more quickly. By setting a protruding friction platform 46 and a matching friction groove 47, the contact surface for friction heating is increased, thereby improving the efficiency of heat treatment. When the two friction plates 4 are connected relative to each other, the screw 44 fixed on the electric telescopic rod 43 is inserted into the connecting seat 42, and the nut 45 is tightened from the other end. When the friction plates 4 are needed, the electric telescopic rod 43 can be adjusted according to the temperature of the exhaust gas. When the exhaust gas temperature is low, the telescopic rod can be retracted to make the friction plates 4 and the gas pipe 3 fit more tightly, increasing the pressure and thus improving the efficiency of friction heating. When the difference between the missing temperature and the ideal temperature is small, the pressure between the friction plates 4 and the gas pipe 3 can be appropriately relaxed, saving the driving force required to drive the friction while achieving friction heating.

[0026] Example 4 Based on Example 1, this example discloses a motor vehicle exhaust treatment device, such as... Figures 8 to 10 As shown, the cooling assembly includes a water-cooled pipe 5 fitted onto the air supply pipe 3, a water tank 51 fixedly mounted on the mounting plate 1, the two ends of the water-cooled pipe 5 being connected to the top and bottom of the water tank 51 respectively, and a water pump 52 directly connected to the water-cooled pipe 5 at the bottom of the water tank 51. A heat dissipation assembly is mounted on the water tank 51; the heat dissipation assembly includes a heat dissipation frame 53 fixedly mounted in front of the water tank 51, a crossbar 54 fixedly mounted on the heat dissipation frame 53, and several air guide plates 55 symmetrically rotated between the crossbar 54 and the bottom of the heat dissipation frame 53, with the rotation axis of the air guide plates 55 extending out of the crossbar 54. One end of the rotating rod 56 is fixedly installed, and the other end of the rotating rod 56 located on one side of the heat sink 53 is provided with a connecting rod 57. The rotating rod 56 and the connecting rod 57 are rotatably connected. The connecting rod 57 is provided with a linkage mechanism. The linkage mechanism includes an electric telescopic rod 58 symmetrically fixedly installed on the heat sink 53. An L-shaped telescopic arm 59 is fixedly installed at the movable end of the electric telescopic rod 58. A clearance groove 510 is opened on the telescopic arm 59. A fixed rod 511 extending into the clearance groove 510 is fixedly installed on the connecting rod 57. The fixed rod 511 is slidably connected to the clearance groove 510.

[0027] The implementation principle of this embodiment is as follows: When the exhaust gas temperature is too high due to long-term high-speed operation of the vehicle, the coolant in the water tank 51 can be pumped into the water cooling pipe 5 for circulation by the water pump 52. The water cooling pipe 5 is wrapped around the air supply pipe 3, which can cool the exhaust gas through rapid heat conduction to meet the appropriate temperature required for catalysis. It can also pre-cool the exhaust gas to allow solid particles to settle and avoid clogging the catalytic converter 33. When the coolant circulates, the relative air flow brought by the vehicle's forward movement can exchange heat with the water tank 51 to cool it down, thereby maintaining the coolant circulation. By activating the electric telescopic rod 58, the telescopic arm 59 is moved, which in turn moves the fixed rod 511 and the connecting rod 57. The angle of the air guide plate 55 is adjusted so that air larger than the area of ​​the water tank 51 can be guided to the water tank 51, increasing the cooling speed. This achieves the adjustment of the cooling system circulation and is suitable for different cooling needs.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A motor vehicle exhaust gas treatment device, comprising a mounting plate (1), a pipe rack (2) fixedly mounted on the mounting plate (1), an air supply pipe (3) fixedly mounted on the pipe rack (2), a catalytic converter (31) fixedly mounted at one end of the air supply pipe (3), an exhaust pipe (32) fixedly mounted at the other end of the catalytic converter (31), and a catalytic converter (33) disposed in the catalytic converter (31), characterized in that, The catalyst (33) has several evenly distributed intake pipes (34) at one end near the gas supply pipe (3). The length of the intake pipes (34) is less than the length of the catalyst (33). The catalyst (33) has several connecting cavities (35) coaxially arranged with the intake pipes (34) at one end near the exhaust pipe (32). The catalyst (33) has several extension pipes (36) pointing towards the gas supply pipe (3) and connected to the connecting cavities (35). The other end of the extension pipes (36) is located inside the catalyst (33), and the catalyst (33) has several connecting cavities (37) at the other end of the extension pipes (36). The catalyst (33) has several exhaust pipes (38). One end of the exhaust pipes (38) is connected to the connecting cavities (37), and the other end passes through the catalyst (33). Two semi-circular friction plates (4) are slidably installed on the gas pipe (3). A connecting mechanism is provided on the friction plate (4), a driving mechanism is provided on the friction plate (4), and a cooling component is provided on the gas pipe (3).

2. The motor vehicle exhaust gas treatment device according to claim 1, characterized in that, Conical guide blocks (39) are fixedly installed in both the first (35) and the second (37) of the connecting cavity. The tip of the conical guide block (39) in the first (35) points to the air intake pipe (34), and the tip of the conical guide block (39) in the second (37) points to the extension pipe (36).

3. The motor vehicle exhaust gas treatment device according to claim 2, characterized in that, The sidewall of the tapered guide block (39) is provided with an inwardly concave arc.

4. The motor vehicle exhaust gas treatment device according to claim 1, characterized in that, The connecting mechanism includes connecting seats (42) fixedly installed at the four corners of the friction plate (4). The two friction plates (4) are arranged opposite to each other. An electric telescopic rod (43) is provided on the connecting seat (42) of one friction plate (4) and passes through the connecting seat (42). A screw (44) is fixedly installed at one end of the electric telescopic rod (43) that passes through the connecting seat (42). A nut (45) is threaded onto one end of the screw (44) that passes through the connecting seat (42) of the other friction plate (4).

5. A motor vehicle exhaust gas treatment device according to claim 1, characterized in that, The drive assembly includes a semi-tooth ring (41) fixedly mounted on the friction plate (4), a drive motor (48) fixedly mounted on the mounting plate (1), and a gear (49) meshing with the semi-tooth ring (41) fixedly mounted at the output end of the drive motor (48).

6. The motor vehicle exhaust gas treatment device according to claim 1, characterized in that, The gas pipe (3) is made of copper alloy at the position corresponding to the friction plate (4), and the gas pipe (3) and the friction plate (4) are provided with frosted surfaces at the corresponding positions.

7. A motor vehicle exhaust gas treatment device according to claim 6, characterized in that, Several trapezoidal friction platforms (46) are fixedly installed on the gas pipeline (3), and friction grooves (47) adapted to the friction platforms (46) are opened on the inner side wall of the friction plate (4).

8. A motor vehicle exhaust gas treatment device according to claim 1, characterized in that, The cooling assembly includes a water-cooled pipe (5) fitted on the gas supply pipe (3), a water tank (51) fixedly installed on the mounting plate (1), the two ends of the water-cooled pipe (5) being connected to the top and bottom of the water tank (51) respectively, and a water pump (52) is directly installed on the water-cooled pipe (5) at the bottom of the water tank (51) and the water tank (51), and a heat dissipation assembly is installed on the water tank (51).

9. A motor vehicle exhaust gas treatment device according to claim 8, characterized in that, The heat dissipation assembly includes a heat dissipation frame (53) fixedly installed in front of the water tank (51). A crossbar (54) is fixedly installed on the heat dissipation frame (53). Several air guide plates (55) are symmetrically and rotatably installed between the crossbar (54) and the bottom of the heat dissipation frame (53). A rotating rod (56) is fixedly installed at one end of the rotating shaft of the air guide plate (55) that extends out of the crossbar (54). A connecting rod (57) is provided at the other end of the rotating rod (56) located on one side of the heat dissipation frame (53). The rotating rod (56) is rotatably connected to the connecting rod (57). A linkage mechanism is provided on the connecting rod (57).

10. A motor vehicle exhaust gas treatment device according to claim 9, characterized in that, The linkage mechanism includes two electric telescopic rods (58) symmetrically fixedly installed on the heat sink (53). An L-shaped telescopic arm (59) is fixedly installed on the movable end of the electric telescopic rod (58). A clearance groove (510) is provided on the telescopic arm (59). A fixed rod (511) extending into the clearance groove (510) is fixedly installed on the connecting rod (57). The fixed rod (511) is slidably connected to the clearance groove (510).

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