Mixing device

Abstract

The utility model belongs to the engine post-processing technical field, concretely relates to a mixing device. The mixing device includes casing, flow guide subassembly and perforated plate. The casing has mixing chamber, gas inlet and exhaust port, the exhaust port is the communication port of mixing chamber with the outside of casing, be equipped with a plurality of communication holes on the perforated plate, the local part of perforated plate sets up on the exhaust port, and the perforated plate is bent to the direction of exhaust port and sets up, the included angle surface of the perforated plate after bending faces the second end setting. The local part of the perforated plate after bending is lifted, compared with the perforated plate of plane setting on the exhaust port, can contact with the gas flowing into the mixing chamber from the gas inlet chamber in advance, can reform in advance and flow freely, increase the mixing space between the local perforated plate and carrier, increase the mixing distance, thereby utilize the concentration difference to increase the time length of molecular diffusion, more favorably the uniformity of mixing.

Description

Technical Field

[0001] This utility model belongs to the field of engine aftertreatment technology, and specifically relates to a mixing device. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Currently, mixing devices commonly used in engine aftertreatment systems have an air inlet for exhaust gas inflow, an exhaust outlet for exhaust gas outflow, and a perforated plate mounted on the exhaust outlet. Exhaust gas and urea droplets passing through the mixing device flow through the perforated plate at the exhaust outlet before exiting the mixing device. Currently, commonly used perforated plates are flat plate structures. Because the perforated plate can exchange heat with the outside environment at the exhaust outlet, the plate temperature is low, making it easy for urea droplets to crystallize on its surface. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] This utility model provides a mixing device, comprising:

[0006] The housing has a mixing chamber, an air inlet, and an exhaust port, wherein the exhaust port is a communication port between the mixing chamber and the outside of the housing;

[0007] A flow guiding assembly having a first end and a second end, the first end being configured to communicate with a urea nozzle, and the second end communicating with the mixing chamber; the flow guiding assembly having a flow guiding orifice adjacent to the first end and communicating with the interior of the flow guiding assembly and the air inlet; and

[0008] A perforated plate having multiple connecting holes, a portion of which is disposed on the exhaust port, and the perforated plate is bent toward the exhaust port, with the included angle of the bent perforated plate facing the second end.

[0009] The bent porous plate is partially lifted, allowing it to come into earlier contact with the gas flowing from the inlet chamber into the mixing chamber compared to a porous plate with a flat surface on the exhaust port. This facilitates earlier re-smoothing and smoother mixing, promoting thorough mixing of the exhaust gas and urea droplets and improving mixing uniformity. Simultaneously, the partial lifting of the porous plate increases the mixing space between this portion of the plate and the carrier, increasing the mixing distance. This utilizes the concentration difference to extend the molecular diffusion time, further enhancing mixing uniformity.

[0010] Meanwhile, because the exhaust gas has a certain temperature, and the exhaust gas and urea droplets continuously transfer heat, the bent porous plate is surrounded by hot gas, preventing heat loss to the outside environment. This keeps the porous plate at a relatively high temperature, and the urea droplets falling onto the bent porous plate will decompose directly at the high temperature, which helps to prevent crystallization. That is, in this embodiment, the heat of the gas is used to heat the porous plate, thereby improving its anti-crystallization performance.

[0011] In some embodiments, the porous plate includes:

[0012] A connecting portion, the connecting portion being disposed on the exhaust port; and

[0013] The bending portion is connected to the connecting portion at an angle and bends into the mixing cavity, with the angle between the connecting portion and the bending portion facing the second end.

[0014] The bent section of this perforated plate is raised, allowing the gas flowing out from the second end to contact the bent section earlier, thus accelerating the decomposition of the urea liquid and improving the mixing effect. At the same time, this perforated plate also has advantages such as simple structure and ease of processing.

[0015] In some embodiments, the included angle is between 45° and 150°.

[0016] When the angle between the connecting part and the bending part is 45°, the bending part is lifted, allowing the angle between the connecting part and the bending part to face the second end. This means the airflow from the second end can directly collide with the bending part, heating it and simultaneously breaking up urea droplets, causing them to decompose. If the angle between the connecting part and the bending part is too small (less than 45°), the angle cannot completely cover the opening at the second end, easily causing some airflow to escape. When the angle between the connecting part and the bending part is greater than 150°, the distance between the bending part and the exhaust port decreases, which is not conducive to mixing. Therefore, an angle between the connecting part and the bending part between 45° and 150° is preferable.

[0017] In some embodiments, the connecting portion and the bending portion are connected in an arc shape.

[0018] This porous plate structure improves the airflow at the connection point between the joint and the bend, preventing the formation of an airflow stagnation zone at this location, which would cause urea droplets to come into contact with the angle between the joint and the bend, forming urea precipitates.

[0019] In some embodiments, the mixing cavity has a spherical structure.

[0020] The outer periphery of the mixing chamber is close to spherical with a smooth surface to reduce the flow resistance of the airflow in the mixing chamber, reduce eddies, and reduce back pressure.

[0021] In some embodiments, the housing includes:

[0022] Inner shell;

[0023] A first partition plate and a second partition plate are sleeved on the flow guiding assembly. The urea flow direction of the first partition plate and the second partition plate is arranged in the inner shell, and the first partition plate and the second partition plate separate the inner shell into the air inlet chamber and the mixing chamber.

[0024] The shell structure is simple. The first and second partition plates can separate the air inlet chamber and the mixing chamber, which is beneficial to improve the mixing effect of urea and exhaust gas and improve the fullness of mixing.

[0025] In some embodiments, the flow guiding component includes:

[0026] A tapered tube, one end of which is the first end of the flow guiding assembly and connected to the urea nozzle, the diameter of the tapered tube gradually increases in the direction away from the first end, and the tapered tube has the flow guiding hole;

[0027] An outer tube, the outer tube being connected between the other end of the tapered tube and the mixing chamber; and

[0028] An inner tube, which passes through the outer tube, has a strip-shaped hole.

[0029] Compared to cylindrical tubes, the conical tube's structure provides a downward-sloping flow direction for the airflow, reducing airflow resistance and ensuring more uniform air intake through its guide holes. As the exhaust gas carries urea droplets into the mixing chamber, the droplets continuously collide with the inner tube. Passing through the strip-shaped orifice, the urea droplets are thoroughly broken down, reducing their diameter and preventing deposition due to their weight. This helps lower the risk of urea crystallization in the mixing unit.

[0030] In some embodiments, the inner tube includes:

[0031] A first tube body, wherein the strip hole is disposed on the first tube body; and

[0032] At least two snap-fit ​​arms are provided, each snap-fit ​​arm being connected to one end of the first tube body near the tapered tube, and the snap-fit ​​arm being used to abut against the inner wall of the outer tube.

[0033] The snap-fit ​​single arm is used to abut against the inner wall of the outer tube, thereby fixing the inner tube to the inner wall of the outer tube. This connection structure is simple and easy to assemble and disassemble.

[0034] In some embodiments, the tapered tube includes:

[0035] The second tube body has the flow guide hole arranged along the circumference of the second tube body;

[0036] A flow guide plate is connected to one side wall of the flow guide hole, and the flow guide plate is inclined.

[0037] Multiple guide vanes located on the wall of the conical tube create a rotating disturbance, causing the exhaust gas to collide violently with the urea droplets after entering the conical tube through the guide hole and rotate, increasing the flow distance and thus increasing the mixing distance between the exhaust gas and the urea droplets, which is beneficial to improving the mixing effect.

[0038] In some embodiments, the guide vane is tilted towards the second tube body.

[0039] The guide vanes tilted inwards within the second tube allow the exhaust gas to enter the conical tube and collide with the urea droplets injected into the conical tube, thus improving the mixing effect. Simultaneously, the inward tilt of the guide vanes allows for a larger diameter second tube to be installed within the same space, which is beneficial for increasing capacity. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the assembly structure of the mixing device provided in this embodiment of the utility model;

[0042] Figure 2 This is an exploded structural diagram of the mixing device provided in an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the structure of the tapered tube provided in this embodiment of the utility model;

[0044] Figure 4 This is a schematic diagram of the inner tube provided in an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the structure of the perforated plate provided in this embodiment of the utility model.

[0046] The markings in the image are as follows:

[0047] 100 - Housing; 110 - Mixing chamber; 120 - Air inlet; 130 - Exhaust port; 140 - Inner shell; 150 - First partition plate; 160 - Second partition plate; 170 - Air inlet chamber; 180 - Outer shell;

[0048] 200 - Flow guiding assembly; 210 - First end; 220 - Second end; 230 - Tapered tube; 231 - Second tube body; 2311 - Flow guiding hole; 232 - Flow guiding plate; 240 - Outer tube; 250 - Inner tube; 251 - First tube body; 2511 - Strip-shaped hole; 252 - Single arm;

[0049] 300 - Perforated plate; 310 - Connecting hole; 320 - Connecting part; 330 - Bending part. Detailed Implementation

[0050] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0051] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" 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. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0052] This embodiment provides a mixing device. The mixing device utilizes a urea injection unit installed on the exhaust pipe to spray a measured amount of urea aqueous solution into the exhaust pipe in a mist form. The urea droplets undergo hydrolysis and pyrolysis reactions under the action of high-temperature exhaust gas, generating the desired reducing agent, ammonia (NH3). Ammonia (NH3), under the action of a catalyst, selectively reduces nitrogen oxides (NOx) to nitrogen (N2), thus purifying the exhaust gas.

[0053] The mixing device includes a housing 100, now combined Figure 1 and Figure 2 The detailed structure of the housing 100 is described below.

[0054] like Figure 1 and Figure 2 As shown, the housing 100 has a mixing chamber 110, an air inlet 120, and an exhaust port 130. The exhaust port 130 is a communication port between the mixing chamber 110 and the outside of the housing 100. The housing 100 also has an air inlet chamber 170, which is connected to the air inlet 120. The housing 100 can also be connected to a urea nozzle, and the urea sprayed from the urea nozzle can enter the air inlet chamber 170. During operation, exhaust gas enters the air inlet chamber 170 from the air inlet 120. At the same time, the urea nozzle sprays urea into the air inlet chamber 170, and the urea begins to decompose to produce ammonia after entering the air inlet chamber 170. During the gas flow, the exhaust gas carries urea droplets and flows from the air inlet chamber 170 into the mixing chamber 110. The exhaust gas and urea are fully mixed in the mixing chamber 110, so that the ammonia reacts with the nitrogen oxides (NOx) in the exhaust gas to purify the nitrogen oxides (NOx) in the exhaust gas. Then, the purified exhaust gas is discharged from the exhaust port 130.

[0055] As an alternative, the mixing chamber 110 has a near-spherical structure, meaning that the outer periphery of the mixing chamber 110 is close to a sphere and has a smooth surface, in order to reduce the flow resistance of the airflow in the mixing chamber 110, reduce eddies, and reduce back pressure.

[0056] In some embodiments, the housing 100 includes an inner shell 140 and a first partition plate 150 and a second partition plate 160 sleeved on the flow guide assembly 200. The first partition plate 150 and the second partition plate 160 are arranged in the urea flow direction within the inner shell 140, and the first partition plate 150 and the second partition plate 160 divide the inner shell 140 into an air inlet chamber 170 and a mixing chamber 110. This housing 100 has a simple structure, and the first partition plate 150 and the second partition plate 160 can separate the independent air inlet chamber 170 and the mixing chamber 110, which is beneficial to improving the mixing effect of urea and exhaust gas and improving the thoroughness of mixing.

[0057] Furthermore, the second partition plate 160 bends toward the mixing chamber 110, so that the second partition plate 160 and the inner shell 140 form a spherical structure, thereby reducing the flow resistance of the airflow in the mixing chamber 110.

[0058] In some embodiments, the curved surface corresponding to the inner shell 140 and the mixing cavity 110 is a spherical structure, thereby forming a spherical structure in the mixing cavity 110.

[0059] In addition, the structure of the intake chamber 170 can be the same as that of the mixing chamber 110, which is also a spherical structure, in order to reduce the resistance of the exhaust gas entering the mixing chamber 110 from the intake chamber 170.

[0060] In addition, the housing 100 also includes an outer shell 180, the structure of which may be the same as that of the inner shell 140 and are spaced apart from each other, and the outer shell 180 has a protective function.

[0061] As an optional feature, the mixing device also includes a flow guiding assembly 200, now combined with Figure 2 and- Figure 4 The detailed structure of the flow guiding component 200 is explained.

[0062] like Figure 2 As shown, the flow guiding assembly 200 has a first end 210 and a second end 220. The first end 210 is configured to communicate with a urea nozzle, and the second end 220 communicates with a mixing chamber 110. The flow guiding assembly 200 has a flow guiding hole 2311, which is located near the first end 210 and connects the interior of the flow guiding assembly 200 with the air inlet 120. The flow guiding assembly 200 is used to guide the flow of exhaust gas and urea droplets between the air inlet chamber 170 and the mixing chamber 110, so that the exhaust gas carries urea droplets into the mixing chamber 110 and is fully mixed in the mixing chamber 110.

[0063] Furthermore, such as Figure 2 and Figure 3 As shown, the flow guiding assembly 200 includes a tapered tube 230, one end of which is the first end 210 of the flow guiding assembly 200 and is connected to a urea nozzle, allowing urea droplets to be directly sprayed into the interior of the tapered tube 230. The diameter of the tapered tube 230 gradually increases in the direction away from the first end 210, and the tapered tube 230 has a flow guiding hole 2311. After the exhaust gas enters the intake chamber 170 from the intake port 120, it can enter the interior of the tapered tube 230 through the flow guiding hole 2311, so that the exhaust gas mixes with the urea droplets and flows into the mixing chamber 110 inside the tapered tube 230.

[0064] Specifically, the conical tube 230, compared to the cylindrical tube, provides a downward-sloping flow direction for the airflow, which helps to reduce the resistance of airflow collision, and the air intake of the guide hole 2311 of the conical tube 230 is more uniform.

[0065] In some embodiments, the tapered tube 230 includes a second tube body 231 and guide vanes 232. A guide hole 2311 is arranged circumferentially along the second tube body 231; the guide vane 232 is connected to one side wall of the guide hole 2311 and is inclined. Multiple guide vanes 232 located on the tube wall of the tapered tube 230 create a rotational disturbance, causing the exhaust gas to enter the tapered tube 230 from the guide hole 2311 and collide violently with urea droplets, resulting in a rotating flow. This increases the flow distance and, consequently, the mixing distance between the exhaust gas and the urea droplets, thus improving the mixing effect.

[0066] In some embodiments, the guide vane 232 is inclined inward toward the second tube 231, so that the exhaust gas entering the conical tube 230 can collide with the urea droplets injected into the conical tube 230, which is beneficial to improving the mixing effect. At the same time, the inwardly inclined guide vane 232 allows for the arrangement of a larger diameter second tube 231 in the same space, which is beneficial to increasing the capacity.

[0067] The tilt direction of the guide vane 232 is consistent with the swirl direction of the exhaust gas.

[0068] In other embodiments, the guide vane 232 may also be tilted outward from the conical tube 230, which is beneficial to increasing the swirling speed of the exhaust gas entering the conical tube 230.

[0069] In some embodiments, the flow guiding assembly 200 further includes an outer tube 240, which is connected between the other end of the tapered tube 230 away from the first end 210 and the mixing chamber 110. The outer tube 240 passes through the first partition plate 150 and the second partition plate 160, so that the air inlet chamber 170 forms an independent chamber and the mixing chamber 110 is an independent chamber, avoiding the mixing of airflow in the air inlet chamber 170 and the mixing chamber 110, which would cause flow around the air and improve the mixing effect of the mixing device.

[0070] The outer tube 240 can be a cylindrical tube, which serves to guide the flow and connect the air inlet chamber 170 and the mixing chamber 110.

[0071] In some embodiments, such as Figure 2 and Figure 4 The flow guiding component 200 also includes an inner tube 250, which is inserted into the outer tube 240. The inner tube 250 is provided with a strip-shaped hole 2511. During the process of the exhaust gas carrying urea droplets into the mixing chamber 110, the urea droplets continuously collide with the inner tube 250. As they flow through the strip-shaped hole 2511, the urea droplets are fully broken down and decomposed, reducing the diameter of the urea droplets and preventing the urea droplets from depositing due to their large weight. This helps to reduce the risk of urea crystallization in the mixing device.

[0072] Furthermore, the strip-shaped hole 2511 extends from the first end 210 to the second end 220, thereby allowing the rotating airflow to fully collide with the inner tube 250, which is beneficial to improving the breaking effect on urea droplets.

[0073] In some embodiments, the inner tube 250 includes a first tube body 251 and at least two snap-fit ​​arms 252. A strip-shaped hole 2511 is provided on the first tube body 251. The snap-fit ​​arms 252 are connected to one end of the first tube body 251 near the tapered tube 230. The snap-fit ​​arms 252 are used to abut against the inner wall of the outer tube 240, thereby fixing the inner tube 250 to the inner wall of the outer tube 240. This connection structure is simple and easy to assemble and disassemble.

[0074] The inner tube 250 protrudes from the second partition plate 160 at one end near the mixing chamber 110, and is partially located inside the mixing chamber 110, so that the airflow is concentrated into the mixing chamber 110 and avoids dispersion. More specifically, the end of the inner tube 250 near the mixing chamber 110 is the second end 220 of the flow guide assembly 200, and the second end 220 protrudes at a predetermined distance from the outer tube 240.

[0075] The mixing device also includes a perforated plate 300, now combined with Figure 1 , Figure 2 and Figure 5 The detailed structure of the perforated plate 300 is explained.

[0076] like Figure 1 , Figure 2 and Figure 5 As shown, the porous plate 300 has multiple connecting holes 310. A portion of the porous plate 300 is disposed on the exhaust port 130, and the porous plate 300 is bent towards the exhaust port 130. The included angle of the bent porous plate 300 (in the figure, included angle α) faces the second end 220. The bent portion of the porous plate 300 is raised. Compared to a porous plate disposed flat on the exhaust port 130, the portion of the porous plate 300 in this embodiment can contact the gas flowing into the mixing chamber 110 from the inlet chamber 170 earlier, which can facilitate earlier re-smoothing and smoothing, and is conducive to the thorough mixing of exhaust gas and urea droplets, improving the uniformity of mixing. At the same time, the partial lifting of the porous plate 300 increases the mixing space between the portion of the porous plate 300 and the carrier, increasing the mixing distance, thereby increasing the molecular diffusion time by utilizing the concentration difference, which is more conducive to the uniformity of mixing.

[0077] Meanwhile, because the exhaust gas has a certain temperature, and the exhaust gas and urea droplets continuously transfer heat, the bent porous plate 300 is surrounded by hot gas, preventing heat loss to the outside environment. This maintains the porous plate 300 at a relatively high temperature. When urea droplets fall onto the bent porous plate 300, they decompose directly at this high temperature, which helps prevent crystallization. In this embodiment, the heat of the gas is used to heat the porous plate 300, improving its anti-crystallization performance.

[0078] In some embodiments, the porous plate 300 includes a connecting portion 320 and a bending portion 330. The connecting portion 320 is disposed on the exhaust port 130, and is connected to the side wall of the exhaust port 130. The bending portion 330 is connected to the connecting portion 320 at an angle α and bends into the mixing chamber 110, with the angle α between the connecting portion 320 and the bending portion 330 facing the second end 220. The bending portion 330 of the porous plate 300 is raised, allowing the gas flowing out from the second end 220 to contact the bending portion 330 in advance, thereby causing the urea liquid to decompose in advance and improving the mixing effect.

[0079] The perforated plate 300 also has the advantages of simple structure and easy processing.

[0080] In some embodiments, the included angle α is between 45° and 150°. When the included angle α between the connecting portion 320 and the bending portion 330 is 45°, the bending portion 330 is raised, and the included angle α between the connecting portion 320 and the bending portion 330 faces the second end 220. That is, the airflow flowing out of the second end 220 can directly collide with the bending portion 330 to heat the bending portion 330, while maintaining the bending portion 330's function of breaking up urea droplets and causing them to decompose. If the included angle α between the connecting portion 320 and the bending portion 330 is too small (less than 45°), the included angle α cannot cover the opening of the second end 220, which can easily cause some airflow to escape. When the included angle α between the connecting portion 320 and the bending portion 330 is greater than 150°, the distance between the bending portion 330 and the exhaust port 130 decreases, which is not conducive to mixing. Therefore, it is preferable that the included angle α between the connecting part 320 and the bending part 330 is between 45° and 150°.

[0081] Specifically, the included angle α between the connecting part 320 and the bending part 330 can be any angle such as 60°, 80°, 90°, 100°, 105°, 120°, 125°, 130°, 135°, 140°, 145° or 150°.

[0082] Preferably, in order to optimize the space before and after the bending portion 330, the included angle α between the connecting portion 320 and the bending portion 330 is between 80° and 120°, which is beneficial to improving the uniformity of mixing.

[0083] In some embodiments, the connecting portion 320 and the bending portion 330 are connected in an arc shape, thereby improving the airflow at the connection position of the connecting portion 320 and the bending portion 330, and preventing the formation of an airflow stagnation zone at this position, which would cause urea droplets to come into contact with the angle α between the connecting portion 320 and the bending portion 330 to form urea precipitate.

[0084] The urea precipitate can be either urea crystals or urea stones. Urea crystals are formed due to the loss of water from urea droplets, leading to supersaturation and urea precipitation. They are a product of a physical reaction process and can continue to decompose with increasing temperature. However, the connection between the connecting part 320 and the bending part 330 is located at the exhaust port 130, where the temperature is lower than inside the mixing chamber 110, which is unfavorable for the decomposition of urea crystals. As for urea stones, they are byproducts of side reactions during urea decomposition and are chemical reaction products requiring higher temperatures to decompose. The connection between the connecting part 320 and the bending part 330 is located at the exhaust port 130, where the temperature is insufficient to decompose urea stones. In this embodiment, the arc-shaped connection between the connecting part 320 and the bending part 330 can avoid the above problems to a certain extent.

[0085] Optionally, the bend 330 abuts against the inner wall of the inner shell 140, thereby preventing airflow from escaping in the gap between the bend 330 and the inner shell 140, which helps to ensure the mixing effect.

[0086] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "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 are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0087] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0088] In this utility model, unless otherwise explicitly 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, an electrical connection, or a connection that allows communication between them; 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0089] In this utility model, unless otherwise explicitly 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.

[0090] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0091] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A mixing device, characterized in that, include: The housing has a mixing chamber, an air inlet, and an exhaust port, wherein the exhaust port is a communication port between the mixing chamber and the outside of the housing; A flow guiding assembly having a first end and a second end, the first end being configured to communicate with a urea nozzle, the second end being configured to communicate with the mixing chamber, the flow guiding assembly having a flow guiding hole near the first end, and the flow guiding hole communicating with the interior of the flow guiding assembly and the air inlet; as well as A perforated plate having multiple connecting holes, a portion of which is disposed on the exhaust port, and the perforated plate is bent toward the exhaust port, with the included angle of the bent perforated plate facing the second end.

2. The mixing device according to claim 1, characterized in that, The porous plate includes: A connecting portion, the connecting portion being disposed on the exhaust port; and The bending portion is connected to the connecting portion at an angle and bends into the mixing cavity, with the angle between the connecting portion and the bending portion facing the second end.

3. The mixing device according to claim 1, characterized in that, The included angle is between 45° and 150°.

4. The mixing device according to claim 2, characterized in that, The connecting part and the bending part are connected in an arc shape.

5. The mixing apparatus according to claim 1, characterized in that, The mixing cavity has a spherical structure.

6. The mixing apparatus according to claim 5, characterized in that, The housing includes: Inner shell; A first partition plate and a second partition plate are sleeved on the flow guiding assembly. The urea flow direction of the first partition plate and the second partition plate is arranged in the inner shell, and the first partition plate and the second partition plate separate the inner shell into the air inlet chamber and the mixing chamber.

7. The mixing apparatus according to any one of claims 1-6, characterized in that, The flow guiding component includes: A tapered tube, one end of which is the first end of the flow guiding assembly and connected to the urea nozzle, the diameter of the tapered tube gradually increases in the direction away from the first end, and the tapered tube has the flow guiding hole; An outer tube, the outer tube being connected between the other end of the tapered tube and the mixing chamber; and An inner tube, which passes through the outer tube, has a strip-shaped hole.

8. The mixing apparatus according to claim 7, characterized in that, The inner tube includes: A first tube body, wherein the strip hole is disposed on the first tube body; and At least two snap-fit ​​arms are provided, each snap-fit ​​arm being connected to one end of the first tube body near the tapered tube, and the snap-fit ​​arm being used to abut against the inner wall of the outer tube.

9. The mixing apparatus according to claim 7, characterized in that, The tapered tube includes: The second tube body has the flow guide hole arranged along the circumference of the second tube body; A flow guide plate is connected to one side wall of the flow guide hole and is inclined.

10. The mixing apparatus according to claim 9, characterized in that, The guide vane is tilted towards the second tube.

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