Post-treatment mixer and automobile

Abstract

The utility model relates to the technical field of automobile tail gas treatment, and particularly discloses an after-treatment mixer and an automobile, the after-treatment mixer comprises: a housing having a gas inlet, a mixing chamber and a gas outlet which are communicated in sequence; the cavity dividing piece divides the mixing cavity into an air inlet cavity and an air outlet cavity, and the air blocking piece is located in the air inlet cavity and divides the air inlet cavity into a first flow dividing opening and a second flow dividing opening; the flow guide pipe is provided with a first inlet communicated with the first flow dividing opening, a second inlet communicated with the second flow dividing opening and an outlet communicated with the first inlet and the second inlet, and the outlet is further communicated with the air outlet cavity; and the turbulent flow assembly is used for carrying out turbulent flow on the fluid primarily mixed by the flow guide pipe. According to the scheme, the problem of low gas-liquid mixing uniformity of a post-treatment mixer in the prior art is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile exhaust treatment, in particular to a post-treatment mixer and an automobile. Background Art

[0002] At present, diesel engines often use oxidation catalyst (DOC) + particulate filter (DPF) + selective catalytic reduction (SCR) technology to treat exhaust pollutants. Among them, in the selective catalytic reduction technology, most of the exhaust gas is catalytically reduced through a post-treatment mixer. By spraying urea solution in the mixer, the urea solution is mixed with the exhaust gas, and the nitrogen oxides in the exhaust gas are catalytically reduced to ammonia before being discharged to ensure that the exhaust gas emissions meet the regulatory limit requirements. However, the existing post-treatment mixers for diesel engines have low gas-liquid mixing uniformity, and the urea aqueous solution cannot be completely decomposed, resulting in low nitrogen oxide conversion efficiency and high energy consumption. Utility Model Content

[0003] The utility model aims to provide a post-processing mixer and a vehicle to solve the problem of low gas-liquid mixing uniformity of the post-processing mixer in the prior art.

[0004] On the one hand, the utility model provides a post-treatment mixer, comprising: a shell, having an air inlet, a mixing chamber and an air outlet connected in sequence; a chamber dividing member, arranged in the mixing chamber, the chamber dividing member dividing the mixing chamber into an air inlet chamber and an air outlet chamber; a wind shield, located in the air inlet chamber, the wind shield dividing the air inlet chamber into a first branch port and a second branch port both connected to the air inlet; a flow guide pipe, having a first inlet connected to the first branch port and a second inlet connected to the second branch port, and outlets connected to the first inlet and the second inlet respectively, the outlets also being connected to the air outlet chamber; a urea nozzle, used for spraying urea into the first branch port; a spoiler assembly, arranged in the air outlet chamber, and used for spoiling the fluid flowing through.

[0005] As a preferred technical solution for the post-processing mixer, the spoiler assembly includes a first spoiler baffle arranged in the air outlet cavity. The first spoiler baffle is located below the guide tube and opposite to the outlet. The first spoiler baffle is used to spoil the fluid dripping from the outlet.

[0006] As a preferred technical solution for the post-processing mixer, the spoiler assembly further includes a second spoiler baffle disposed in the gas outlet cavity, and along the flow direction of the gas, the second spoiler baffle is located downstream of the first spoiler baffle.

[0007] As a preferred technical solution for the post-processing mixer, the first spoiler baffle is generally wavy in shape, the second spoiler baffle is generally arc-shaped, the second spoiler baffle has an opening, and the outer edge of the second spoiler baffle fits the cavity wall of the air outlet cavity.

[0008] As a preferred technical solution for the post-processing mixer, the spoiler assembly also includes a flow stabilizing baffle, which is arranged at the gas outlet. The flow stabilizing baffle has a plurality of flow stabilizing holes arranged at intervals, and the gas can be discharged from the gas outlet through the flow stabilizing holes.

[0009] As a preferred technical solution for the post-processing mixer, the flow stabilizing baffle is further provided with at least three positioning holes, and the at least three positioning holes are distributed at intervals along the circumferential direction of the flow stabilizing baffle.

[0010] As a preferred technical solution for the post-processing mixer, the chamber component includes a first chamber plate and a third chamber plate arranged in parallel, and a second chamber plate connected between the first chamber plate and the third chamber plate, the first chamber plate and the second chamber plate are perpendicular, the third chamber plate and the second chamber plate are perpendicular, the first chamber plate, the second chamber plate, and the third chamber plate are all connected to the inner wall of the mixing chamber, the bottom end of the guide tube passes through the second chamber plate and is connected to the second chamber plate, and the third chamber plate is attached to the side of the guide tube facing the air outlet.

[0011] As a preferred technical solution for the post-processing mixer, the wind shield and the third chamber dividing plate are arranged in parallel and at intervals, and the wind shield fits the side of the guide tube facing the air inlet.

[0012] As a preferred technical solution for the post-processing mixer, the wind shield and the second dividing chamber plate are spaced apart and surround a second diversion opening, and the wind shield and the inner wall of the air inlet cavity surround a first diversion opening.

[0013] As a preferred technical solution for the post-processing mixer, the post-processing mixer also includes a steel wool mixer, which is arranged at the bottom end of the guide tube and is used to break up the fluid entering the guide tube.

[0014] As a preferred technical solution for the post-processing mixer, the post-processing mixer also includes thermal insulation cotton and a shell structure, the thermal insulation cotton is sleeved on the outer surface of the shell, and the shell structure is sleeved on the outer surface of the thermal insulation cotton.

[0015] On the other hand, the utility model provides an automobile, comprising a diesel oxidation catalyst, a diesel particulate filter, a selective catalytic reducer and a post-treatment mixer of any of the above schemes, wherein the air inlet of the diesel particulate filter is connected to the air outlet of the diesel oxidation catalyst, the air inlet in the post-treatment mixer is connected to the air outlet of the diesel particulate filter, and the air outlet in the post-treatment mixer is connected to the air inlet of the selective catalytic reducer.

[0016] The beneficial effects of the utility model are:

[0017] The utility model provides a post-processing mixer, including: a shell, a windshield, a chamber member, a guide tube, a urea nozzle and a spoiler assembly. The post-processing mixer of the utility model can divert gas through the windshield, so that a small part of the gas flows directly into the first inlet of the guide tube from the first diversion port, and most of the gas flows in from the second diversion port, moves from bottom to top along the outer wall of the guide tube, and then enters the second inlet of the guide tube. In this way, the windshield achieves the purpose of increasing the gas flow rate by changing the flow direction of the gas, thereby improving the mixing ability of the gas and urea in the guide tube, so that the mixing of the gas and urea is more uniform; at the same time, the spoiler assembly is set to disturb the fluid dripping from the guide tube, and the speed and flow direction of the fluid are adjusted again, which further improves the mixing effect of the gas and urea, and ensures the flow uniformity of the fluid. Utilizing the post-processing mixer of the utility model, the mixing ability of gas and liquid is improved, and the utilization rate of the catalytic carrier is improved, which effectively solves the problem of low gas-liquid mixing uniformity of the post-processing mixer in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure of the post-processing mixer in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0019] Figure 2 The structure of the post-processing mixer in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0020] Figure 3 It is a schematic diagram of the structure of the cavity dividing part in the embodiment of the utility model.

[0021] In the figure:

[0022] 1. Shell; 11. Air inlet; 12. Mixing chamber; 121. Air inlet chamber; 122. Air outlet chamber; 13. Air outlet;

[0023] 2. Windshield member; 21. First windshield plate; 22. First curved plate; 23. Second windshield plate;

[0024] 3. Chamber component; 31. First chamber plate; 32. Second chamber plate; 321. Communication hole; 33. Third chamber plate; 331. First plate body; 332. Second plate body;

[0025] 4. flow guide pipe; 41. first inlet; 42. second inlet;

[0026] 5. Urea nozzle;

[0027] 6. spoiler assembly; 61. first spoiler baffle; 62. second spoiler baffle; 621. opening;

[0028] 7. Flow stabilizing baffle; 71. Flow stabilizing hole; 72. Positioning hole;

[0029] 8. Steel wool mixer; 81. Blocking bracket;

[0030] 92. First shell; 93. Second shell; 94. Mounting seat. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] like Figure 1 As shown, this embodiment provides a post-treatment mixer that can be used to treat exhaust pollutants from automobiles, can further improve the mixing effect of gas and urea, and ensure the flow uniformity of the fluid.

[0036] The post-treatment mixer includes a shell 1, a windshield 2, a chamber dividing part 3, a guide tube 4, a urea nozzle 5 and a spoiler assembly 6. The windshield 2, the chamber dividing part 3, the guide tube 4 and the spoiler assembly 6 are all arranged in a mixing chamber 12. The chamber dividing part 3 and the guide tube 4 can divide the mixing chamber 12 into an air inlet chamber 121 and an air outlet chamber 122. At the same time, the windshield 2 can be used to divide the air inlet 11 into a first branch port and a second branch port, so that a small part of the gas coming in from the air inlet 11 directly flows into the first inlet 41 of the guide tube 4 from the first branch port, and most of the gas flows in from the second branch port, moves from bottom to top along the outer wall of the guide tube 4, and then enters the second inlet 42 of the guide tube 4. The urea nozzle 5 sprays urea directly into the guide tube 4 and fully mixes it with the gas, and then drips onto the spoiler assembly 6. The spoiler assembly 6 is used to turbulently flow the gas and urea again to achieve the purpose of mixing the gas and urea again.

[0037] In order to further improve the mixing effect and uniformity of gas and urea, the spoiler assembly 6 provided in the present scheme includes a first spoiler baffle 61 and a second spoiler baffle 62 which are spaced apart in the air outlet cavity 122, wherein the first spoiler baffle 61 is provided below the guide tube 4 and opposite to the outlet, so that the fluid dripping from the guide tube 4 can flow into the first spoiler baffle 61, thereby further disturbing the fluid. Along the flow direction of the gas, the second spoiler baffle 62 is located downstream of the first spoiler baffle 61. Such a setting further enhances the fluid mixing effect while making the fluid more evenly distributed.

[0038] In this solution, in order to break up the fluid, the shape of the first spoiler baffle 61 is generally wavy, and the middle protrusion of the first spoiler baffle 61 is directly opposite to the bottom of the guide tube 4, so that the middle protrusion of the first spoiler baffle 61 can further break up the fluid, thereby improving the mixing effect of the fluid; and the shape of the second spoiler baffle 62 is generally arc-shaped, so that it can match the shape of the shell 1, which is convenient for installation and connection. Among them, the second spoiler baffle 62 has an opening 621, and the opening 621 connects the air outlet cavity 122 and the air outlet 13. The setting of the opening 621 can make the fluid flow out more evenly. Among them, the second spoiler baffle 62 also has two small circular holes arranged at intervals. In this embodiment, the shape of the second spoiler baffle 62 can also be generally set to be fan-shaped, so that it is easy to match the shape of the inner wall of the shell 1 and easy to connect.

[0039] Specifically, in order to be able to adjust the speed and flow direction of the fluid again, the spoiler assembly 6 of the present solution also includes a flow stabilizing baffle 7, which is arranged at the air outlet 13 and is arranged perpendicular to the air inlet and outlet directions of the shell 1, wherein the flow stabilizing baffle 7 separates the air outlet cavity 122, and the air outlet cavity 122 and the air outlet 13 are connected through the flow stabilizing baffle 7 having a plurality of flow stabilizing holes 71 arranged at intervals, thereby achieving a flow stabilizing effect.

[0040] Furthermore, the flow stabilizing baffle 7 is provided with at least three positioning holes 72, and at least three or more positioning holes 72 are spaced apart along the circumferential direction of the flow stabilizing baffle 7. The flow stabilizing baffle 7 is welded with the inner wall of the flange and the air outlet cavity 122, and a plurality of flow stabilizing holes 71 are distributed along the gas flow direction, wherein the aperture of the flow stabilizing holes 71 is 6mm-10mm, and the distance between two adjacent flow stabilizing holes 71 is 10mm-20mm. Preferably, the aperture of the flow stabilizing holes 71 is 8mm, and the number of the flow stabilizing holes 71 is 200-250, or a corresponding number of flow stabilizing holes 71 is set according to actual conditions, so that the setting can effectively ensure the uniformity of the flow of the airflow in a limited space.

[0041] Preferably, there are three positioning holes 72 , one positioning hole 72 is arranged directly above the flow stabilizing baffle 7 , and the other two positioning holes 72 are symmetrically distributed at the lower left and lower right, and the angle between two adjacent positioning holes 72 is 120°.

[0042] like Figure 3 As shown, the chamber component 3 in the present embodiment is bent and has a step structure. The chamber component 3 includes a first chamber plate 31, a second chamber plate 32 and a third chamber plate 33 connected in sequence, wherein the second chamber plate 32 is arranged along the inlet and outlet directions horizontal to the shell 1, and the bottom end of the guide tube 4 passes through the connecting hole 321 on the second chamber plate 32 and is connected to the inner wall of the connecting hole 321, so that the chamber component 3 and the guide tube 4 can close the connecting hole 321, thereby achieving the purpose of dividing the mixing chamber 12 into the air inlet chamber 121 and the air outlet chamber 122, so as to prevent the gas from flowing out directly through the chamber component 3.

[0043] Furthermore, the third chamber plate 33 includes a first plate body 331 and a second plate body 332 which are connected to each other. In order to avoid the guide tube 4, an angle is set between the first plate body 331 and the second plate body 332, and the second plate body 332 is inclined toward the air outlet 13 to avoid interference when installing the guide tube 4, and the first plate body 331 and the second plate body 332 can wrap the side of the guide tube 4 facing the air outlet 13, so that the guide tube 4 is more stable and reliable during operation.

[0044] The first plate body 331 includes a first baffle, a second arc-shaped baffle and a third baffle connected in sequence. The first baffle and the third baffle are connected to the inner wall of the mixing chamber. The second arc-shaped baffle wraps the side of the guide tube 4 facing the air outlet 13 .

[0045] Optionally, two oblong holes are provided in the middle of the second arc-shaped baffle, the size of the oblong holes is 13×20 mm, and the interval between the two oblong holes is 35 mm.

[0046] The oblong hole is formed by a stamping process to simplify the structure of the second arc-shaped baffle plate and facilitate the production and processing of the cavity dividing part 3 .

[0047] like Figure 2 As shown, in this solution, in order to allow the windshield 2 to better wrap one side of the guide tube 4, the windshield 2 is arranged perpendicular to the air inlet and outlet directions of the housing 1, and a first diversion port is formed between the inner wall of the air inlet cavity 121 at the upper end of the windshield 2, and a second diversion port is formed between the bottom end of the windshield 2, the inner wall of the air inlet cavity 121 and the diversion cavity 3. In this way, the gas can be diverted to a large extent, achieving the purpose of adjusting the gas speed and flow direction.

[0048] Among them, in this solution, the wind shield 2 includes a first wind shield plate 21, a first curved plate 22 and a second wind shield plate 23 which are connected in sequence, and the first wind shield plate 21 and the second wind shield plate 23 can be connected to the two opposite side walls of the air inlet cavity 121, thereby achieving the fixation of the wind shield 2; at the same time, in order to match the shape of the guide tube 4, a first curved plate 22 is provided to wrap the outer wall of the guide tube 4.

[0049] Optionally, both ends of the first arc-shaped plate 22 are provided with oblong openings to facilitate connection with other components.

[0050] In this way, a first flow diversion port is formed between the upper end of the first wind shield 21, the upper end of the first curved plate 22, the upper end of the second wind shield 23 and the inner wall of the air inlet cavity 121, and a second flow diversion port is formed between the bottom end of the first wind shield 21, the bottom end of the first curved plate 22, the bottom end of the second wind shield 23 and the inner wall of the air inlet cavity 121 and the dividing cavity member 3. The first flow diversion port and the second flow diversion port are provided so as to achieve the purpose of diversion of the wind shield 2.

[0051] It should be noted that after a small amount of gas enters from the first diversion port, since the guide tube 4 has a first inlet 41 and a second inlet 42 that are interconnected, the gas can flow into the guide tube 4 through the first inlet 41, and then flow into the steel wool mixer 8, so as to preheat the steel wool mixer 8 in advance and increase the temperature. Most of the gas flows in from the second diversion port, moves upward along the outer wall of the guide tube 4, and then enters the guide tube 4 through the second inlet 42; the gas flowing into the guide tube 4 is mixed with urea and broken by the steel wool mixer 8 below. When the gas carries urea through the steel wool, the urea is decomposed into multiple smaller droplets, increasing the evaporation area of ​​urea, thereby reducing the risk of urea crystallization; at the same time, the structure of steel wool is intricate, and urea and gas are mixed more evenly, thereby improving the conversion efficiency of nitrogen oxides in the airflow.

[0052] The minimum distance between the second inlet 42 and the top of the flow guide tube 4 is 20 mm.

[0053] Optionally, the first inlet 41 and the second inlet 42 are both rectangular in shape, and the size of the first inlet 41 is 3 mm×12 mm; the size of the second inlet 42 is 80 mm×51 mm.

[0054] Optionally, four rectangular protrusions are provided at the upper end of the guide tube 4, each adjacent rectangular protrusion is spaced 50-60 mm apart and has a size of 26 mm×2.5 mm, which is convenient for process clamping.

[0055] In this solution, there are multiple first inlets 41 , which are spaced apart along the circumference of the air guide tube 4 ; there are two second inlets 42 , which are arranged to avoid the first plate 331 and the wind shield 2 .

[0056] Specifically, a blocking bracket 81 is provided at the bottom of the steel wool mixer 8, and the blocking bracket 81 can block the fluid after the steel wool mixer 8 is broken to prevent urea and gas from flowing out directly. The blocking bracket 81 is generally wavy in shape, which is convenient for matching the shape of the first spoiler baffle 61.

[0057] In order to reduce airflow loss, the post-processing mixer is also provided with insulation cotton and a shell structure, the shell structure includes a first shell 92 and a second shell 93, the insulation cotton is sleeved on the outer surface of the shell 1, and the first shell 92 and the second shell 93 cooperate with each other to fix the insulation cotton. The insulation cotton can be made of materials such as rock wool board.

[0058] In this embodiment, the post-treatment mixer further includes a mounting seat 94 disposed at the upper end of the housing 1 for facilitating the installation of the urea nozzle 5 .

[0059] This embodiment also provides an automobile, including the post-processing mixer of the above scheme. The above scheme is adopted to improve the gas mixing ability, ensure the flow uniformity of the fluid, ensure the flow uniformity of the airflow in a short distance, greatly improve the utilization rate of the catalytic carrier, shorten the lateral size of the post-processor, cancel the silencer structure, reduce the weight of the post-processing system, and facilitate the layout of the whole vehicle.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A post-processing mixer, characterized in that: include: A housing (1) having an air inlet (11), a mixing chamber (12) and an air outlet (13) which are connected in sequence; A chamber dividing member (3) is arranged in the mixing chamber (12), and the chamber dividing member (3) divides the mixing chamber (12) into an air inlet chamber (121) and an air outlet chamber (122); A wind shield (2) is located in the air inlet cavity (121), and the wind shield (2) divides the air inlet cavity (121) into a first flow diversion port and a second flow diversion port, both of which are connected to the air inlet (11); A flow guide pipe (4), comprising a first inlet (41) communicating with the first flow diversion port, a second inlet (42) communicating with the second flow diversion port, and an outlet communicating with the first inlet (41) and the second inlet (42) respectively, wherein the outlet is also communicating with the air outlet cavity (122); a urea nozzle (5), used for spraying urea toward the first branch port; The flow disturbance component (6) is arranged in the air outlet cavity (122) and is used to disturb the fluid flowing through the cavity.

2. The post-processing mixer according to claim 1, characterized in that The spoiler assembly (6) comprises a first spoiler baffle (61) arranged in the air outlet cavity (122), the first spoiler baffle (61) being located below the flow guide pipe (4) and opposite to the outlet, and the first spoiler baffle (61) being used to spoil the fluid dripping from the outlet.

3. The post-processing mixer according to claim 2, characterized in that The spoiler assembly (6) further comprises a second spoiler baffle (62) arranged in the air outlet cavity (122); along the flow direction of the gas, the second spoiler baffle (62) is located downstream of the first spoiler baffle (61).

4. The post-processing mixer according to claim 3, characterized in that The first spoiler baffle (61) is generally wavy in shape, the second spoiler baffle (62) is generally fan-shaped in shape, the second spoiler baffle (62) has an opening (621), and the outer edge of the second spoiler baffle (62) is in contact with the cavity wall of the air outlet cavity (122).

5. The post-processing mixer according to claim 1, characterized in that: The spoiler assembly (6) further comprises a flow stabilizing baffle (7), wherein the flow stabilizing baffle (7) is arranged at the gas outlet (13), and the flow stabilizing baffle (7) has a plurality of flow stabilizing holes (71) arranged at intervals, and gas can be discharged from the gas outlet (13) through the flow stabilizing holes (71).

6. The post-processing mixer according to claim 5, characterized in that The flow stabilizing baffle (7) is also provided with at least three positioning holes, and the at least three positioning holes are distributed at intervals along the circumferential direction of the flow stabilizing baffle (7).

7. The post-processing mixer according to claim 1, characterized in that The chamber component (3) comprises a first chamber plate (31) and a third chamber plate (33) which are arranged in parallel, and a second chamber plate (32) connected between the first chamber plate (31) and the third chamber plate (33); the first chamber plate (31) and the second chamber plate (32) are perpendicular to each other; the third chamber plate (33) and the second chamber plate (32) are perpendicular to each other; the first chamber plate (31), the second chamber plate (32) and the third chamber plate (33) are all connected to the inner wall of the mixing chamber (12); the bottom end of the flow guide tube (4) passes through the second chamber plate (32) and is connected to the second chamber plate (32); the third chamber plate (33) is attached to the side of the flow guide tube (4) facing the air outlet (13).

8. The post-processing mixer according to claim 7, characterized in that The wind shield (2) and the third cavity plate (33) are arranged in parallel and at intervals, and the wind shield (2) is in contact with a side of the flow guide tube (4) facing the air inlet (11).

9. The post-processing mixer according to claim 7, characterized in that: The wind shield (2) and the second dividing chamber plate (32) are arranged at intervals and surround the second flow dividing opening, and the wind shield (2) and the inner wall of the air inlet chamber (121) surround the first flow dividing opening.

10. The post-processing mixer according to any one of claims 1 to 9, characterized in that: The post-treatment mixer further comprises a steel wool mixer (8), wherein the steel wool mixer (8) is arranged at the bottom end of the flow guide tube (4), and the steel wool mixer (8) is used to break up the fluid entering the flow guide tube (4).

11. The post-processing mixer according to any one of claims 1 to 9, characterized in that: The post-processing mixer also includes thermal insulation cotton and a shell structure. The thermal insulation cotton is sleeved on the outer surface of the shell (1), and the shell structure is sleeved on the outer surface of the thermal insulation cotton.

12. A car, characterized in that: The invention comprises a diesel oxidation catalyst, a diesel particulate filter, a selective catalytic reducer and the aftertreatment mixer according to any one of claims 1 to 11, wherein the air inlet of the diesel particulate filter is connected to the air outlet of the diesel oxidation catalyst, the air inlet (11) in the aftertreatment mixer is connected to the air outlet of the diesel particulate filter, and the air outlet (13) in the aftertreatment mixer is connected to the air inlet of the selective catalytic reducer.

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