Exhaust gas after-treatment hybrid device and vehicle

Abstract

This application relates to an exhaust gas aftertreatment mixing device and a vehicle. An exhaust gas aftertreatment mixing device includes: a cylinder having an inlet and an outlet disposed opposite to each other along the axial direction of the cylinder; the sidewalls of the cylinder include a first sidewall and a second sidewall disposed opposite to each other along a first direction intersecting the axial direction of the cylinder; an exhaust gas aftertreatment mechanism extending through the first sidewall and into the cylinder along the first direction, with one end of the exhaust gas aftertreatment mechanism extending into the cylinder defining an exhaust chamber between it and the second sidewall; the exhaust gas aftertreatment mechanism includes a premixer, the premixer including a first fluid inlet communicating with the inlet and a second fluid inlet for supplying a reducing agent; and a flow divider located within the cylinder and connected to the outside of the premixer, the bottom end of the flow divider defining an airflow passage communicating with the inlet between it and the second sidewall. This avoids urea crystallization caused by urea in the mixed airflow flowing into the exhaust chamber depositing on the second sidewall.

Description

Technical Field

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

[0002] In engine exhaust aftertreatment systems, selective catalytic reduction (SCR) is typically used to treat the exhaust gases. This involves injecting urea into the exhaust aftertreatment mixing unit to remove nitrogen oxides (NOx) from the exhaust gases. X The nitrogen oxides (NOx) in the exhaust gas are reduced to harmless nitrogen (N2) and water (H2O). X The purpose of ).

[0003] However, traditional exhaust gas aftertreatment mixing devices are prone to causing urea crystallization during use. Summary of the Invention

[0004] Therefore, it is necessary to provide an exhaust gas after-treatment mixing device and vehicle to address the problem that traditional exhaust gas after-treatment mixing devices are prone to causing urea crystallization during use.

[0005] According to one aspect of this application, an exhaust gas aftertreatment mixing device is provided, comprising:

[0006] The cylinder has an air inlet and an air outlet that are arranged opposite to each other along the axial direction of the cylinder. The sidewall of the cylinder includes a first sidewall and a second sidewall that are arranged opposite to each other along a first direction that intersects with the axial direction of the cylinder.

[0007] An exhaust gas aftertreatment mechanism is provided, extending through the first sidewall and into the cylinder along the first direction. One end of the exhaust gas aftertreatment mechanism extending into the cylinder defines an exhaust chamber between itself and the second sidewall. The exhaust gas aftertreatment mechanism includes a premixer, which includes a first fluid inlet communicating with the air inlet and a second fluid inlet for supplying a reducing agent. The exhaust chamber is connected to both the first fluid inlet and the second fluid inlet. The premixer is configured to mix the airflow flowing in from the first fluid inlet and the reducing agent flowing in from the second fluid inlet before flowing into the exhaust chamber.

[0008] A flow divider is located inside the cylinder and connected to the outside of the premixer, and is used to guide the airflow toward the first fluid inlet. The bottom end of the flow divider and the second sidewall define an airflow passage that communicates with the air inlet.

[0009] The exhaust chamber is connected between the airflow passage and the air outlet.

[0010] In one embodiment, the bottom end of the diverter has a predetermined interval along the first direction between it and the second sidewall.

[0011] In one embodiment, the exhaust gas aftertreatment mechanism further includes a crushing component, and the premixer further includes a mixing outlet communicating with the first fluid inlet, the second fluid inlet and the exhaust chamber respectively;

[0012] The crushing component is connected to one end of the premixer where the mixing outlet is located, and is situated between the mixing outlet and the exhaust chamber. The crushing component is used to crush the mixed airflow flowing from the mixing outlet to the exhaust chamber.

[0013] In one embodiment, the diverter includes a first portion and a second portion arranged at an angle;

[0014] The premixer is configured such that one end of the mixing outlet passes through the first section and is connected to the crushing component;

[0015] The first part and the second part enclose a crushing chamber for accommodating the crushing assembly, and the crushing chamber is respectively connected to the mixing outlet and the exhaust chamber;

[0016] The airflow passage is formed between the second portion and the second sidewall.

[0017] In one embodiment, the second part of the diverter is further provided with a vent that communicates with the crushing chamber.

[0018] In one embodiment, the crushing component includes a plurality of crushing fins;

[0019] Each of the aforementioned crushing fins has a connecting end and a free end disposed opposite to each other. The connecting end is connected to one end of the premixer where the mixing outlet is located, and the free end is closer to the central axis of the mixing outlet than the connecting end.

[0020] Each of the aforementioned crushing fins has a through-hole.

[0021] In one embodiment, each of the broken fins includes two fin portions arranged at an angle;

[0022] Each of the fin portions is provided with the breakage hole.

[0023] In one embodiment, the plurality of crushing fins includes a plurality of upstream crushing fins and a plurality of downstream crushing fins that are spaced apart around the central axis of the mixing outlet.

[0024] The upstream crushing fins and the adjacent downstream crushing fins are arranged alternately along the circumference of the mixing outlet.

[0025] In one embodiment, the upstream break-up fin includes a first mounting portion and a first drain portion connected between its connecting end and its free end;

[0026] The downstream breakable fin includes a second mounting portion and a second drain portion connected between its connecting end and its free end;

[0027] The first mounting portion and the second mounting portion are staggered along the circumference of the mixing outlet, and both extend along the central axis of the mixing outlet.

[0028] The angle between the first drainage portion and the first mounting portion is β1, and the angle between the second drainage portion and the second mounting portion is β2, wherein β1 is greater than β2.

[0029] According to another aspect of this application, a vehicle is provided that includes the aforementioned exhaust aftertreatment mixing device.

[0030] In the aforementioned exhaust gas aftertreatment mixing device and vehicle, exhaust gas flows into the cylinder through the air inlet. Most of the exhaust gas is guided by the diverter to the first fluid inlet and then flows into the premixer. The reducing agent, such as urea spray, flows into the premixer through the second fluid inlet. Because the premixer is configured to mix the airflow from the first fluid inlet and the reducing agent from the second fluid inlet before flowing into the exhaust chamber, this portion of the exhaust gas and urea spray can be mixed within the premixer, and the mixed airflow can flow into the exhaust chamber. Since the exhaust gas aftertreatment mechanism is axially aligned with the cylinder... The first direction of the intersecting lines is set, and since the exhaust chamber is connected between the airflow passage and the exhaust port, a small part of the exhaust gas can flow into the exhaust chamber through the airflow passage and flow towards the exhaust port. This part of the exhaust gas can collide with the mixed airflow flowing roughly in the first direction, so that this part of the exhaust gas can be fully mixed with the mixed airflow flowing into the exhaust chamber, improving the mixing effect of the exhaust gas. At the same time, this part of the exhaust gas can also flow along the second side wall and blow towards the exhaust port, avoiding the crystallization of urea caused by the deposition of urea in the mixed airflow flowing into the exhaust chamber on the second side wall. Attached Figure Description

[0031] Figure 1 A schematic diagram of the structure of an exhaust gas aftertreatment mixing device according to an embodiment of this application is shown;

[0032] Figure 2 A schematic diagram of the structure of a premixer according to one embodiment of this application is shown;

[0033] Figure 3A schematic diagram of the flow divider in one embodiment of this application is shown;

[0034] Figure 4 A schematic diagram of the structure of a broken fin in one embodiment of this application is shown;

[0035] Figure 5 A schematic diagram of the structure of the breakable fins and the guide tube in one embodiment of this application is shown;

[0036] Figure 6 It shows Figure 5 Top view;

[0037] Figure 7 A schematic diagram of the structure of the first drainage part and the first mounting part of the broken fin in one embodiment of this application is shown;

[0038] Figure 8 A schematic diagram of the structure of the fin portion of a broken fin is shown in one embodiment of this application.

[0039] In the diagram: 10. Exhaust gas aftertreatment mixing device; 110. Cylinder; 111. Air inlet; 112. Air outlet; 113. First side wall; 114. Second side wall; 115. First mounting hole; 120. Exhaust chamber; 130. Premixer; 131. First fluid inlet; 132. Second fluid inlet; 133. Pipe; 134. Flow guide; 135. Mixing outlet; 1301. Nozzle mounting seat; 140. Flow divider; 141. First part; 1411. Second mounting hole; 142. Second part; 143. Third part. Parts; 144, Vent hole; 150, Airflow passage; 160, Crushing chamber; 170, Crushing fin; 171, Upstream crushing fin; 1711, First mounting part; 1712, First drainage part; 1713, First channel; 172, Downstream crushing fin; 1721, Second mounting part; 1722, Second drainage part; 1723, Second channel; 1701, Connecting end; 1702, Free end; 1703, Crushing hole; 1704, Fin part; 180, Baffle plate; 181, Baffle hole; 190, Guide tube. Detailed Implementation

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0041] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0046] Figure 1 A schematic diagram of the structure of the exhaust gas aftertreatment mixing device 10 in one embodiment of this application is shown.

[0047] See Figure 1 An embodiment of this application provides an exhaust gas aftertreatment mixing device 10, which includes a cylinder 110, an exhaust gas aftertreatment mechanism, and a diverter 140.

[0048] The cylinder 110 has an air inlet 111 and an air outlet 112 that are arranged opposite to each other along the axial direction of the cylinder 110. The side wall of the cylinder 110 includes a first side wall 113 and a second side wall 114 that are arranged opposite to each other along a first direction F1 that intersects with the axial direction of the cylinder 110.

[0049] The exhaust gas aftertreatment mechanism passes through the first sidewall 113 and extends into the cylinder 110 along the first direction F1. One end of the exhaust gas aftertreatment mechanism extending into the cylinder 110 defines an exhaust chamber 120 between it and the second sidewall 114. The exhaust gas aftertreatment mechanism includes a premixer 130. The premixer 130 includes a first fluid inlet 131 communicating with the air inlet 111 and a second fluid inlet 132 for supplying a reducing agent. The exhaust chamber 120 is connected to the first fluid inlet 131 and the second fluid inlet 132 respectively. The premixer 130 is configured to allow the airflow flowing in from the first fluid inlet 131 and the reducing agent flowing in from the second fluid inlet 132 to be initially mixed before flowing into the exhaust chamber 120.

[0050] The diverter 140 is located inside the cylinder 110 and connected to the outside of the premixer 130. The diverter 140 is used to guide the airflow toward the first fluid inlet 131. The bottom end of the diverter 140 and the second side wall 114 define an airflow passage 150 that communicates with the air inlet 111.

[0051] Understandably, exhaust gas flows into the cylinder 110 through the inlet 111. Most of the exhaust gas is guided by the diverter 140 to the first fluid inlet 131 and then into the premixer 130. The reducing agent, such as urea spray, flows into the premixer 130 through the second fluid inlet 132. Since the premixer 130 is configured to allow the airflow from the first fluid inlet 131 and the reducing agent from the second fluid inlet 132 to be initially mixed before flowing into the exhaust chamber 120, this portion of exhaust gas and urea spray can be mixed in the premixer 130, and the mixed airflow can flow into the exhaust chamber 120. Because the exhaust gas aftertreatment mechanism is along the axis of the cylinder 110... The first direction F1 is set with intersecting directions, and since the exhaust chamber 120 is connected between the airflow passage 150 and the outlet 112, a small portion of exhaust gas can flow into the exhaust chamber 120 through the airflow passage 150 and flow towards the outlet 112. This portion of exhaust gas can collide with the mixed airflow flowing roughly along the first direction F1, so that this portion of exhaust gas can be fully mixed with the mixed airflow flowing into the exhaust chamber 120, improving the exhaust gas treatment effect. At the same time, this portion of exhaust gas can also flow along the second side wall 114 and be blown towards the outlet 112, avoiding the crystallization of urea caused by the deposition of urea in the mixed airflow flowing into the exhaust chamber 120 on the second side wall 114.

[0052] In some embodiments, the bottom end of the diverter 140 and the second sidewall 114 have a predetermined interval along the first direction F1.

[0053] If the distance between the bottom end of the diverter 140 and the second sidewall 114 in the first direction F1 is too large, too much exhaust gas will flow through the airflow passage 150 to the outlet 112, which is not conducive to the mixing of exhaust gas. If the distance between the bottom end of the diverter 140 and the second sidewall 114 in the first direction F1 is too small, it will affect the purging of urea in the exhaust chamber 120. Therefore, the bottom end of the diverter 140 and the second sidewall 114 need to have a preset distance along the first direction F1. This can prevent too much exhaust gas from flowing through the airflow passage 150 to the outlet 112, and can also effectively purge the urea in the exhaust chamber 120, reducing the probability of urea crystallization. It is also conducive to the full mixing of this part of the exhaust gas with the mixed airflow flowing into the exhaust chamber 120, which can improve the mixing effect of exhaust gas.

[0054] In some embodiments, the first direction F1 is perpendicular to the axial direction of the cylinder 110.

[0055] In some embodiments, the cylinder 110 is provided with a first mounting hole 115 for mounting the premixer 130, which facilitates the stable installation of the exhaust gas aftertreatment mechanism inside the cylinder 110 and improves the reliability of the exhaust gas aftertreatment mechanism. Specifically, the first mounting hole 115 is provided on the first side wall 113.

[0056] In some embodiments, please refer to Figure 2 The premixer 130 includes a pipe body 133, a first fluid inlet 131 is opened on the side wall of the pipe body 133, and a second fluid inlet 132 is located at the top of the pipe body 133. The exhaust gas aftertreatment mixing device 10 also includes a nozzle mounting seat 1301 connected to and communicating with the second fluid inlet 132. The nozzle mounting seat 1301 is used to install a urea injector. The urea injector sprays a fixed amount of urea spray into the pipe body 133 through the second fluid inlet 132. This part of the urea spray can be fully mixed with the exhaust gas entering from the first fluid inlet 131 on one side of the pipe body 133, which can improve the mixing and treatment effect of the exhaust gas.

[0057] In some embodiments, the pipe body 133 is provided with a plurality of first fluid inlets 131 arranged at intervals along the circumference of the pipe body 133. The premixer 130 also includes a plurality of guide sections 134 corresponding to the first fluid inlets 131. The guide sections 134 are arranged along the tangential direction of the pipe body 133, which is conducive to the flow of exhaust gas along the guide sections 134. In this way, the exhaust gas can pass through the first fluid inlets 131 along the tangential direction of the pipe body 133 and can rotate along the inner sidewall of the pipe body 133, which is conducive to improving the mixing effect of urea spray and exhaust gas.

[0058] In some embodiments, the premixer 130 may be a swirl mixing tube or other devices capable of premixing.

[0059] In some embodiments, the size of the premixer 130 in the first direction F1 is smaller than a preset value. That is, the size of the tube 133 along its longitudinal direction is smaller than a preset value. This is to avoid the airflow velocity entering the premixer 130 being reduced too much due to the tube 133 being too long, which would significantly reduce the swirling mixing effect within the premixer 130. Therefore, it is necessary to make the size of the premixer 130 in the first direction F1 smaller than the preset value. This setting is beneficial to improving the swirling mixing effect of the premixer 130.

[0060] In some embodiments, the upper end of the premixer 130 passes through the first sidewall 113 of the cylinder 110, and the lower end of the premixer 130 passes through the first portion 141 of the diverter 140, which facilitates the stable installation of the premixer 130 and the diverter 140. Specifically, the first portion 141 is provided with a second mounting hole 1411 for the lower end of the premixer 130 to pass through, and the lower end of the premixer 130 passes through the second mounting hole 1411 to install the lower end of the premixer 130 onto the first portion 141 of the diverter 140.

[0061] In some embodiments, the exhaust gas aftertreatment mechanism further includes a crushing component, and the premixer 130 further includes a mixing outlet 135 that is respectively connected to the first fluid inlet 131, the second fluid inlet 132 and the exhaust chamber 120. The crushing component is connected to one end of the premixer 130 where the mixing outlet 135 is located and is located between the mixing outlet 135 and the exhaust chamber 120. The crushing component is used to crush the mixed gas flow from the mixing outlet 135 to the exhaust chamber 120.

[0062] Thus, after the exhaust gas is initially mixed by the premixer 130, the mixed airflow can flow toward the exhaust chamber 120. During this process, the crushing component can be used to crush this part of the mixed airflow so that the urea spray droplets are broken into smaller droplets, which is beneficial to further improve the mixing effect of urea spray and exhaust gas, thereby improving the exhaust gas treatment effect.

[0063] In this embodiment, the mixing outlet 135 is located at the end of the premixer 130 away from the second fluid inlet 132. Specifically, the mixing outlet 135 is located at the end of the tube 133 away from the second fluid inlet 132.

[0064] In some embodiments, please refer to Figure 3 The diverter 140 includes a first portion 141 and a second portion 142 arranged at an angle. One end of the premixer 130, with a mixing outlet 135, passes through the first portion 141 and connects to the crushing assembly. The first portion 141 and the second portion 142 enclose a crushing chamber 160 for accommodating the crushing assembly. The crushing chamber 160 communicates with the mixing outlet 135 and the exhaust chamber 120, respectively. An airflow passage 150 is formed between the second portion 142 and the second sidewall 114.

[0065] With this configuration, the mixed airflow can flow toward the exhaust chamber 120. During this process, the crushing components in the crushing chamber 160 can be used to crush this part of the mixed airflow, which helps to break the urea droplets in this part of the mixed airflow into smaller droplets in the crushing chamber 160, and to better mix with the exhaust gas in the crushing chamber 160. The mixed airflow is then discharged to the exhaust port 112 through the exhaust chamber 120, which helps to improve the exhaust gas treatment effect.

[0066] In some embodiments, the first portion 141 extends along the axial direction of the cylinder 110, which facilitates the premixer 130 to pass through the first portion 141 with one end of the mixing outlet 135 passing through it, and also facilitates the premixer 130 to be set along the first direction F1, so that the urea spray can be sprayed vertically downward through the premixer 130, making the premixer 130 occupy less space and more compact.

[0067] In some embodiments, the first portion 141 extends along the axial direction of the cylinder 110, and the second portion 142 is perpendicular to each other (i.e., the angle θ1 between the first portion 141 and the second portion 142 is 90 degrees). It is understood that the second portion 142 can restrict the flow of air entering the cylinder 110 from the inlet 111 toward the outlet 112, and can guide the airflow toward the first fluid inlet 131 of the premixer 130. Specifically, the connection between the second portion 142 and the first portion 141 has an arc-shaped transition, which facilitates better guidance of the airflow toward the first fluid inlet 131 of the premixer 130.

[0068] In some embodiments, please refer to Figure 3 The diverter 140 also includes a third part 143, which is connected to the side of the first part 141 away from the second part 142 and along the axial direction of the cylinder 110. The third part 143 and the second part 142 are located on opposite sides of the premixer 130, facilitating the connection of the end of the third part 143 away from the first part 141 to the cylinder 110, thereby improving the installation stability of the diverter 140 and the premixer 130. Specifically, the third part 143 is perpendicular to the first part 141 (i.e., the included angle θ2 between the first part 141 and the third part 143 is 90 degrees), and the connection between the third part 143 and the first part 141 has an arc-shaped transition, which can improve the strength of the diverter 140.

[0069] In some embodiments, the second portion 142 of the diverter 140 is further provided with a vent 144 communicating with the crushing chamber 160.

[0070] The second part 142 may be provided with multiple sets of vent holes arranged at intervals along the first direction F1. Each vent hole group includes multiple vent holes 144 arranged at intervals along the second direction F2. The first direction F1 and the first direction F2 are perpendicular to each other and are both perpendicular to the axial direction of the cylinder 110.

[0071] Thus, a portion of the exhaust gas flows into the premixer 130 through the first fluid inlet 131 for mixing; another portion of the exhaust gas enters the crushing chamber 160 through the vent 144, where it mixes with the urea spray flowing into the crushing chamber 160; and yet another portion of the exhaust gas flows into the exhaust chamber 120 through the airflow passage 150, where it is fully mixed with the mixed airflow flowing into the exhaust chamber 120. This improves the exhaust gas treatment effect and reduces the pressure within the premixer 130 by diverting and depressurizing the exhaust gas. It also allows the premixer 130 to be designed with a smaller size in the first direction F1 than a preset value, improving the mixing effect of the premixer 130 while preventing an increase in exhaust back pressure within the premixer 130 due to its smaller size in the first direction F1 than the preset value.

[0072] In some embodiments, please refer to Figure 1 and in conjunction with reference Figure 4 The crushing assembly includes multiple crushing fins 170. Each crushing fin 170 has a connecting end 1701 and a free end 1702 that are disposed opposite to each other. The connecting end 1701 is connected to one end of the premixer 130 where the mixing outlet 135 is provided. Compared to the connecting end 1701, the free end 1702 is closer to the central axis of the mixing outlet 135.

[0073] Specifically, the connecting end 1701 is connected to the bottom end of the guide tube 190 described below.

[0074] Understandably, the crushing fins 170 are offset toward the central axis of the mixing outlet 135. On the one hand, the mixed airflow flowing out of the mixing outlet 135 can easily come into contact with the crushing fins 170, so as to break the urea droplets in the mixed airflow into smaller droplets. On the other hand, multiple crushing fins 170 can enclose a space with gradually decreasing radial dimensions, increase the residence time of the mixed airflow in the space, and thus help improve the treatment effect of the exhaust gas.

[0075] In some embodiments, each breakable fin 170 is provided with a breakable hole 1703.

[0076] When urea droplets in the mixed airflow come into contact with the crushing fins 170, a portion of the mixed airflow can flow downstream through the crushing holes 1703, while another portion of the mixed airflow, after contacting the crushing fins 170, can flow along the crushing fins 170 toward the central axis closer to the mixing outlet 135. This allows the mixed airflow to be split and separated by multiple crushing fins 170 and fully disturbed and collided, which can accelerate the crushing, evaporation, and decomposition of urea spray droplets, thereby improving the treatment effect of exhaust gas and reducing the probability of urea crystallization.

[0077] In some embodiments, please refer to Figure 4 Each broken fin 170 includes two fin portions 1704 arranged at an angle, and each fin portion 1704 is provided with a broken hole 1703.

[0078] In this embodiment, a groove with an opening facing downwards is formed between the two fin portions 1704, which facilitates the flow of mixed airflow downstream along the fin portions 1704 and prevents the mixed airflow from accumulating in the groove formed between the two fin portions 1704, thereby reducing the probability of urea crystallization.

[0079] It is understandable that the mixed airflow that comes into contact with the broken fins 170 can flow downstream along the two fin sections 1704 respectively, which can further divert the flow and accelerate the breaking, evaporation and decomposition of urea spray droplets, thereby improving the treatment effect of exhaust gas.

[0080] In some embodiments, please refer to Figure 1 and in conjunction with reference Figure 5 The multiple crushing fins 170 include multiple upstream crushing fins 171 and multiple downstream crushing fins 172 that are arranged at intervals around the central axis of the mixing outlet 135. The upstream crushing fins 171 and the adjacent downstream crushing fins 172 are arranged alternately along the circumference of the mixing outlet 135.

[0081] This configuration allows for the use of multiple upstream crushing fins 171 to accelerate the crushing, evaporation, and decomposition of urea spray droplets. The mixed airflow leaking from the gap between two adjacent upstream crushing fins 171 can reach the downstream crushing fins 172. Similarly, a large portion of the mixed airflow first reaches the downstream crushing fins 172 and flows along the downstream crushing fins 172 toward the central axis near the mixing outlet 135. Another portion of the mixed airflow passes through the crushing holes 1703 of the downstream crushing fins 172 and is sufficiently disturbed and collided. This allows the mixed airflow to be separated and sufficiently disturbed and collided by multiple downstream crushing fins 172, which can further accelerate the crushing, evaporation, and decomposition of urea spray droplets, further improve the exhaust gas treatment effect, and further reduce the probability of urea crystallization.

[0082] In some embodiments, please refer to Figure 6 The free ends 1702 of multiple upstream breakable fins 171 define a first channel 1713, and the free ends 1702 of multiple downstream breakable fins 172 define a second channel 1723. The radial dimension D1 of the first channel 1713 is smaller than the radial dimension D2 of the second channel 1723.

[0083] After being broken and mixed by multiple upstream crushing fins 171, the mixed airflow reaches multiple downstream crushing fins 172. With D1 being less than D2, the free end 1702 of the downstream crushing fins 172 is slightly away from the center. This helps to reduce airflow resistance and also allows the mixed airflow to flow more quickly toward the second channel 1723, improving the mixing effect while enabling the mixed gas to be discharged quickly.

[0084] In some embodiments, please refer to Figure 5 and in conjunction with reference Figure 7The upstream crushing fin 171 includes a first mounting portion 1711 and a first guide portion 1712 connected between its connecting end 1701 and free end 1702, facilitating the installation of the first guide portion 1712 on one end of the premixer 130 where the mixing outlet 135 is located via the first mounting portion 1711. Specifically, the end of the first mounting portion 1711 away from the first guide portion 1712 can be connected to the end of the premixer 130 where the mixing outlet 135 is located via a guide tube 190, and the end of the first mounting portion 1711 away from the first guide portion 1712 can be installed on the inner wall of the guide tube 190.

[0085] The downstream crushing fin 172 includes a second mounting portion 1721 and a second guide portion 1722 connected between its connecting end 1701 and free end 1702. The second guide portion 1722 is mounted to one end of the premixer 130 where the mixing outlet 135 is located via the second mounting portion 1721. Specifically, the end of the second mounting portion 1721 away from the second guide portion 1722 can be connected to the end of the premixer 130 where the mixing outlet 135 is located via a guide tube 190, and the end of the second mounting portion 1721 away from the second guide portion 1722 can be mounted on the inner wall of the guide tube 190.

[0086] The first mounting section 1711 and the second mounting section 1721 are staggered along the circumference of the mixing outlet 135 so that the upstream crushing fin 171 and the adjacent downstream crushing fin 172 are staggered along the circumference of the mixing outlet 135.

[0087] The first mounting portion 1711 and the second mounting portion 1721 both extend along the central axis of the mixing outlet 135. The included angle between the first drainage portion 1712 and the first mounting portion 1711 is β1, and the included angle between the second drainage portion 1722 and the second mounting portion 1721 is β2 (combined). Figure 5 and Figure 7 (to understand), where β1 is greater than β2.

[0088] With this configuration, the radial dimension of the second channel 1723 enclosed by the free ends 1702 of the multiple downstream crushing fins 172 can be greater than the radial dimension of the first channel 1713 enclosed by the free ends 1702 of the multiple upstream crushing fins 171. As a result, the mixed airflow leaking from the gap between two adjacent upstream crushing fins 171 can flow more easily to the downstream crushing fins 172, thereby improving the processing effect of the crushing assembly.

[0089] In some embodiments, 140°≤β1≤150°, 140°≤β2≤150°.

[0090] If β1 and β2 are too small, the lower end of the corresponding crushing fin 170 will be too close to the center of the crushing chamber 160, resulting in excessive exhaust resistance. If β1 and β2 are too large, too little urea spray will come into contact with the crushing fin, resulting in poor crushing effect of the crushing fin 170. Therefore, β1 and β2 need to be controlled within a suitable range, such as 140°≤β1≤150° and 140°≤β2≤150°. In this way, excessive exhaust resistance can be avoided while ensuring the crushing effect of the crushing fin 170.

[0091] In some embodiments, the vent 144 faces the bottom of the downstream crushing fin 172, so that the mixed airflow flowing to the bottom of the downstream crushing fin 172 is also swept by the airflow flowing out of the vent 144. Under this sweeping action, the urea spray droplets can be broken, evaporated and decomposed in all directions, and the risk of urea crystallization can be reduced more effectively.

[0092] In some embodiments, please refer to Figure 8 The included angle between the two fin sections 1704 is α, where 1° ≤ α ≤ 30°. If α is too small, the broken fin 170 will be difficult to form as a whole. If α is too large, it will hinder the rapid downstream flow of urea spray when it comes into contact with each broken fin 170, easily causing it to accumulate. Therefore, α needs to be controlled within a suitable range, such as 1° ≤ α ≤ 30°. This ensures that the urea spray can flow rapidly downstream when it comes into contact with each broken fin 170, and also facilitates the processing and forming of the broken fin 170.

[0093] In some embodiments, the exhaust gas aftertreatment mixing device 10 further includes a baffle plate 180 disposed between the exhaust chamber 120 and the outlet 112. The baffle plate 180 is embedded in the cylinder 110 and has a plurality of baffle holes 181 that communicate with the exhaust chamber 120 and the outlet 112 respectively.

[0094] The spoiler 180 is coaxially arranged with the cylinder 110, and the size of the spoiler hole 181 is smaller the closer it is to the central axis of the cylinder 110. This arrangement helps to enhance the turbulence effect of the spoiler 180, thereby ensuring the ammonia mixing effect and improving the exhaust gas treatment effect.

[0095] In some embodiments, the spoiler 180 is recessed along the axial direction of the cylinder 110 toward the side closer to the outlet 112. This arrangement helps to increase the space between the premixer 130 and the spoiler 180, which helps to improve the treatment effect of the exhaust gas aftertreatment mixing device 10.

[0096] In some embodiments, the exhaust gas aftertreatment mixing device 10 further includes a guide tube 190 connected between one end of the premixer 130 where the mixing outlet 135 is located and the crushing component. The inner diameter of the guide tube 190 is larger than the inner diameter of the premixer 130. This not only reduces exhaust resistance but also reduces the chance of urea spray directly hitting the surrounding wall surface, thereby reducing the risk of urea crystallization.

[0097] In some embodiments, the radial dimension of the end opening of the guide tube 190 near the premixer 130 is smaller than the radial dimension of the end opening of the guide tube 190 away from the premixer 130. Specifically, the radial dimension of the guide tube 190 gradually increases along the first direction F1. It can be understood that by using this guide tube 190, exhaust resistance can be better reduced, and the chance of urea spray directly hitting the surrounding wall surface can be reduced, thereby reducing the risk of urea crystallization.

[0098] When the exhaust gas aftertreatment mixing device 10 of this application is in use, a nozzle mounting seat 1301 for installing a urea injector can be provided at the second fluid inlet 132. After the urea spray is sprayed out through the nozzle of the urea injector, it can be premixed with the exhaust gas in the premixer 130. The mixed airflow formed by the exhaust gas and urea spray enters the guide tube 190. The gradually expanding guide tube 190 reduces the exhaust resistance and reduces the chance of the urea spray directly hitting the surrounding wall, reducing the risk of urea crystallization. Then the mixed airflow continues to flow downstream. A part of the mixed airflow can flow downstream through the break hole 1703; another part of the mixed airflow, after touching the upstream break fin 171, can flow along the upstream break fin 171 towards the... The flow direction near the central axis of the mixing outlet 135 causes the mixed airflow to be split and fully disturbed and collided by multiple upstream crushing fins 171, which can accelerate the breaking, evaporation and decomposition of urea spray droplets, thereby improving the treatment effect of the exhaust gas and reducing the probability of urea crystallization. A portion of the mixed airflow leaks directly from the gap between two adjacent upstream crushing fins 171, and then touches the downstream crushing fins 172. Similarly, the mixed airflow is split and fully disturbed and collided by multiple downstream crushing fins 172, which can further accelerate the breaking, evaporation and decomposition of urea spray droplets, further improve the treatment effect of the exhaust gas, and further reduce the probability of urea crystallization.

[0099] In addition, a portion of the exhaust gas enters the crushing chamber 160 through multiple vents 144, which purges the bottom of the downstream crushing fins 172 in the crushing chamber 160. This ensures that the urea spray droplets on the downstream crushing fins 172 are broken, evaporated, and decomposed in all directions, further reducing the risk of urea crystallization. Simultaneously, another portion of the exhaust gas flows to the outlet 112 through the airflow passage 150, effectively purging the urea in the exhaust chamber 120 and preventing urea spray from depositing at the bottom of the cylinder 110, thus effectively reducing the risk of urea crystallization.

[0100] Therefore, by using the exhaust gas aftertreatment mixing device 10 of this application, the urea spray droplets can be broken, evaporated and decomposed in all directions, which is beneficial to improving the exhaust gas treatment effect. In addition, it can effectively reduce the risk of urea crystallization and improve the utilization rate of urea during application. The exhaust gas aftertreatment mixing device 10 has a compact structure and better vehicle compatibility.

[0101] One embodiment of this application provides a vehicle including the exhaust aftertreatment mixing device 10 described above.

[0102] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A tail gas aftertreatment mixing device, characterized in that, include: The cylinder has an air inlet and an air outlet that are arranged opposite to each other along the axial direction of the cylinder. The sidewall of the cylinder includes a first sidewall and a second sidewall that are arranged opposite to each other along a first direction that intersects with the axial direction of the cylinder. An exhaust gas aftertreatment mechanism is provided, extending through the first sidewall and into the cylinder along the first direction. One end of the exhaust gas aftertreatment mechanism extending into the cylinder defines an exhaust chamber between itself and the second sidewall. The exhaust gas aftertreatment mechanism includes a premixer and a crushing assembly. The premixer includes a first fluid inlet communicating with the air inlet and a second fluid inlet for supplying a reducing agent. The exhaust chamber is respectively connected to the first fluid inlet and the second fluid inlet. The premixer is configured to mix the airflow flowing from the first fluid inlet and the reducing agent flowing from the second fluid inlet before flowing into the exhaust chamber. The premixer also includes a mixing outlet communicating with the first fluid inlet, the second fluid inlet, and the exhaust chamber. The crushing assembly is connected to the end of the premixer where the mixing outlet is located and is situated between the mixing outlet and the exhaust chamber. The crushing assembly is used to crush the mixed airflow flowing from the mixing outlet to the exhaust chamber. A flow divider is located inside the cylinder and connected to the outside of the premixer, and is used to guide the airflow toward the first fluid inlet. The bottom end of the flow divider and the second sidewall define an airflow passage that communicates with the air inlet. The exhaust chamber is connected between the airflow passage and the air outlet; The crushing component includes multiple crushing fins; each crushing fin includes two fin portions arranged at an angle; the multiple crushing fins include multiple upstream crushing fins and multiple downstream crushing fins respectively arranged around the central axis of the mixing outlet of the premixer, and the upstream crushing fins and the adjacent downstream crushing fins are staggered along the circumference of the mixing outlet.

2. The exhaust gas aftertreatment mixing device according to claim 1, characterized in that, The bottom end of the diverter has a preset interval along the first direction between it and the second sidewall.

3. The exhaust gas aftertreatment mixing device according to claim 1, characterized in that, The diverter includes a first part and a second part that are set at an angle; The premixer is configured such that one end of the mixing outlet passes through the first section and is connected to the crushing component; The first part and the second part enclose a crushing chamber for accommodating the crushing assembly, and the crushing chamber is respectively connected to the mixing outlet and the exhaust chamber; The airflow passage is formed between the second portion and the second sidewall.

4. The exhaust gas aftertreatment mixing device according to claim 3, characterized in that, The second part of the diverter is also provided with a vent that communicates with the crushing chamber.

5. The exhaust gas aftertreatment mixing device according to any one of claims 3-4, characterized in that, Each of the aforementioned crushing fins has a connecting end and a free end disposed opposite to each other. The connecting end is connected to one end of the premixer where the mixing outlet is located, and the free end is closer to the central axis of the mixing outlet than the connecting end. Each of the aforementioned crushing fins has a through-hole.

6. The exhaust gas aftertreatment mixing device according to claim 5, characterized in that, Each of the fin portions is provided with the breakage hole.

7. The exhaust gas aftertreatment mixing device according to claim 5, characterized in that, The upstream breakable fin includes a first mounting portion and a first drain portion connected between its connecting end and its free end; The downstream breakable fin includes a second mounting portion and a second drain portion connected between its connecting end and its free end; The first mounting portion and the second mounting portion are staggered along the circumference of the mixing outlet, and both extend along the central axis of the mixing outlet. The angle between the first drainage portion and the first mounting portion is β1, and the angle between the second drainage portion and the second mounting portion is β2, wherein β1 is greater than β2.

8. A vehicle, characterized in that, Includes the exhaust gas aftertreatment mixing device according to any one of claims 1-7.

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