mixer

Abstract

The utility model belongs to the engine post-processing technical field, concretely relates to a mixer. The mixer includes casing, primary cyclone pipe and intercommunication component, the casing has gas inlet, exhaust port, with the intercommunication of gas inlet intake cavity and with the intercommunication of exhaust port mixing chamber, primary cyclone pipe sets up in the intake cavity, one end of primary cyclone pipe communicates with urea nozzle, primary cyclone pipe has first gas hole, and first gas hole intercommunication intake cavity and the inside of primary cyclone pipe, intercommunication component intercommunicates between primary cyclone pipe and mixing chamber, and intercommunication component includes secondary cyclone pipe and inner tube, and secondary cyclone pipe has second gas hole, and second gas hole intercommunication intake cavity and the inside of secondary cyclone pipe, and inner tube has third gas hole. The mixer is correspondingly set up through first gas hole and second gas hole with intake hole simultaneously, and the airflow area of intake into primary cyclone pipe and intercommunication component is increased, which is favorable for reducing airflow resistance, further increasing airflow velocity, and is favorable for improving mixing effect.

Description

Technical Field

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

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

[0003] Currently, mixers commonly used in engine aftertreatment systems include a housing, an intake pipe, and a connecting assembly. The housing has an air inlet, an exhaust outlet, an intake chamber connected to the air inlet, and a mixing chamber connected to the exhaust outlet. The intake pipe is located in the intake chamber and has vents. The connecting assembly includes an outer tube and an inner tube; the outer tube is a closed circular tube, and the inner tube is embedded within the outer tube. During operation, exhaust gas entering the intake chamber can only enter the intake pipe through the vents. The outer tube cannot receive air, resulting in a small intake area. Furthermore, the outer tube obstructs airflow, reducing airflow velocity and failing to effectively guarantee the mixing effect of the mixer. 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 mixer, comprising:

[0006] A housing having an air inlet, an air outlet, an air intake chamber communicating with the air inlet, and a mixing chamber communicating with the air outlet;

[0007] A primary cyclone tube is disposed in the air intake chamber. One end of the primary cyclone tube is connected to a urea nozzle. The primary cyclone tube has a first air hole, which connects the air intake chamber and the interior of the primary cyclone tube.

[0008] A connecting component is provided, which connects the primary cyclone tube and the mixing chamber. The connecting component includes a secondary cyclone tube and an inner tube. The inner tube is connected to the end of the primary cyclone tube away from the urea nozzle. The secondary cyclone tube is sleeved on the inner tube. The secondary cyclone tube has a second air hole, which connects the air inlet chamber and the interior of the secondary cyclone tube. The inner tube has a third air hole.

[0009] The mixer is configured with a first and a second air vent corresponding to the air inlet, increasing the airflow area for air entering the primary cyclone tube and connecting assembly. This helps reduce airflow resistance and further increases airflow velocity. Increased airflow velocity enhances the airflow speed of urea droplets after they enter the primary cyclone tube and connecting assembly, while also extending the flow path of the urea droplets, accelerating their evaporation and decomposition, and improving anti-crystallization capabilities.

[0010] Meanwhile, the two-stage cyclone tube and the inner tube in this mixer work together effectively, greatly improving the mixer's mixing capacity. The gas velocity distribution within the inner tube is more uniform, and the wall velocity is increased compared to existing structures. The fluid carries urea droplets along the flow, reducing urea deposition on the wall. Furthermore, the flow velocity inside the inner tube is relatively stable, maintaining a high velocity level even at the bottom of the connecting component, further reducing urea deposition.

[0011] In some embodiments, the diameter of the primary cyclone tube gradually increases in the direction away from the urea nozzle.

[0012] The conical structure allows the airflow in the first-stage cyclone tube to flow at an angle toward the connecting component, effectively avoiding airflow collision, reducing back pressure, and helping to increase airflow velocity.

[0013] In some embodiments, the primary cyclone tube includes:

[0014] A primary tube body, the primary tube body having the first vent hole, and the first vent hole being a strip-shaped hole extending axially along the primary tube body; and

[0015] A primary guide vane is connected to one side of the first air hole and folded inward into the primary tube body.

[0016] The primary guide vane enables the airflow to form a rotating airflow within the primary cyclone tube. Combined with the tapered cross-section of the primary cyclone tube, the rotating airflow flows obliquely and swirling towards the connecting component, reducing airflow collision, lowering back pressure, and reducing resistance. Simultaneously, the primary cyclone tube increases the swirling velocity by generating rotating airflow, which helps to increase the airflow velocity after the urea droplets enter the primary cyclone tube and the connecting component. It also extends the flow path of the urea droplets, accelerating their evaporation and decomposition, thus improving anti-crystallization capabilities.

[0017] The first-stage guide vane folds inwards towards the inside of the first-stage tube, allowing for a larger diameter first-stage tube to be accommodated within the limited air intake chamber. This maximizes the intensity of the rotating airflow within the confined space, enhancing mixing capacity and increasing the velocity of the airflow near the walls of the first-stage vortex tube and connecting components. As the airflow reciprocates within and around the third vent of the inner tube, it evaporates and breaks up urea droplets impacting the inner tube wall, thus improving the evaporation effect and consequently enhancing mixing.

[0018] In some embodiments, the primary cyclone tube includes an arcuate protrusion having a plurality of waist-shaped holes spaced apart circumferentially along the primary cyclone tube.

[0019] The airflow within the primary cyclone tube passes through multiple waist-shaped holes at the bulge, forming multiple small airflows. These dispersed small airflows can sweep away the low-speed regions between the vortices. Because the mass of urea droplets is much greater than that of gas, urea droplets will remain and crystallize when the airflow flows through low-speed or stagnant regions. If these crystals cannot be completely decomposed in time, they will continue to grow using these as nuclei. Due to incomplete decomposition, urea crystal stones will eventually form, which, if accumulated to a certain extent, may block the urea flow channel.

[0020] In some embodiments, the second and third air holes are strip-shaped holes extending axially along the secondary cyclone tube.

[0021] The strip-shaped holes help increase the airflow area and reduce resistance, which in turn helps to increase the airflow velocity. This helps to increase the airflow velocity after the urea droplets enter the first-stage cyclone tube and the connecting component, accelerates the evaporation and decomposition of the urea droplets, and helps to improve the anti-crystallization ability.

[0022] In some embodiments, the secondary cyclone tube includes:

[0023] The secondary tube body, wherein the second vent is a strip-shaped hole extending axially along the secondary tube body; and

[0024] A secondary guide vane is connected to one side of the second air hole and folded outwards towards the secondary tube body. The secondary guide vane makes the rotation direction of the airflow in the secondary tube body consistent with the rotation direction of the airflow in the primary vortex tube.

[0025] This two-stage cyclone tube structure creates a swirling flow after the airflow passes through the secondary guide vanes, accelerating the airflow velocity between the secondary cyclone tube and the inner tube. It also results in a more uniform velocity distribution between the two tubes, reducing local dead zones and minimizing urea deposition on the inner tube wall. Furthermore, the secondary guide vanes help prevent interference between the secondary guide vanes and the inner tube.

[0026] In some embodiments, the secondary cyclone tube includes:

[0027] The first inclined portion is located at one end of the secondary cyclone tube near the mixing chamber. Corresponding to the first inclined portion, the inner tube includes a second inclined portion. The first inclined portion and the second inclined portion are inclined at one end facing the mixing chamber, so that the length of the secondary cyclone tube and the inner tube gradually increases along the direction near the exhaust port.

[0028] The mixer uses a first inclined section and a second inclined section to block the airflow from the connecting component, preventing the mixed gas from being discharged directly from the exhaust port. This helps to increase the flow path of the mixed gas in the mixing chamber, thereby improving the mixing effect.

[0029] In some embodiments, both the first inclined portion and the second inclined portion have exhaust holes, so that a portion of the mixed gas can flow through the exhaust holes during the circulation process, thereby using the exhaust holes to break up the urea droplets and improve the mixing effect of the urea droplets and the exhaust gas.

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

[0031] The body, wherein the third vent is disposed on the body; and

[0032] The transition section, along the direction away from the first-stage cyclone tube, has a gradually decreasing diameter and is connected to the first-stage cyclone tube.

[0033] The transition section helps prevent uremic droplets from forming a permanent liquid film in the area between the inner tube and the first-stage cyclone tube, thus reducing the risk of crystallization.

[0034] In some embodiments, the body has an mounting port, and the inner tube further includes:

[0035] A support arm is located between the main body and the secondary cyclone tube. The support arm includes a connecting part and a support part connected at an angle. The connecting part is connected to one side of the mounting port, and the bending direction of the support part is consistent with the airflow direction.

[0036] The support extends in the direction of airflow, which helps to reduce the contact area for urea droplets to deposit, thereby reducing the risk of crystallization and improving the reliability of the inner tube. This support arm can abut against the inner wall of the secondary cyclone tube to support the inner tube and provide support for it. Attached Figure Description

[0037] 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.

[0038] Figure 1 This is a schematic diagram of the assembly structure of the mixer provided in this embodiment of the utility model. Figure 1 ;

[0039] Figure 2 This is a schematic diagram of the assembly structure of the mixer provided in this embodiment of the utility model. Figure 2 ;

[0040] Figure 3 This is an exploded structural diagram of the mixer provided in this embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the structure of the first-stage cyclone tube provided in this embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the connection structure of the primary cyclone tube and the connecting component provided in this embodiment of the utility model;

[0043] Figure 6 This is a schematic diagram of the structure of the two-stage cyclone tube provided in this embodiment of the utility model. Figure 1 ;

[0044] Figure 7 This is a schematic diagram of the structure of the two-stage cyclone tube provided in this embodiment of the utility model. Figure 2 ;

[0045] Figure 8 This is a schematic diagram of the inner tube structure provided in this embodiment of the utility model;

[0046] Figure 9 This is a schematic diagram of the support arm provided in an embodiment of the present invention.

[0047] The markings in the image are as follows:

[0048] 100 - Housing; 110 - Air inlet; 120 - Exhaust outlet; 130 - Intake chamber; 140 - Mixing chamber;

[0049] 200 - First-stage cyclone tube; 210 - First-stage tube body; 211 - First vent; 220 - First-stage guide vane; 230 - Arc-shaped protrusion; 231 - Waist-shaped orifice;

[0050] 300 - Connecting component; 310 - Secondary cyclone tube; 311 - Secondary tube body; 3111 - Secondary vent; 312 - Secondary guide vane; 313 - First inclined section; 3131 - Exhaust port; 320 - Inner tube; 321 - Second inclined section; 322 - Body; 3221 - Third vent; 3222 - Mounting port; 323 - Transition section; 324 - Support arm; 3241 - Connecting section; 3242 - Support section;

[0051] 400-Nozzle seat;

[0052] 500-partition;

[0053] 600-Blower plate;

[0054] 700-Front hole plate. Detailed Implementation

[0055] 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.

[0056] 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.

[0057] This embodiment provides a mixer. The mixer uses a urea injection unit installed on the exhaust pipe to spray a fixed amount of urea aqueous solution into the exhaust pipe in the form of a mist. The urea droplets undergo hydrolysis and pyrolysis reactions under the action of high-temperature exhaust gas to generate the required reducing agent ammonia (NH3). The ammonia (NH3) selectively reduces nitrogen oxides (NOx) to nitrogen (N2) under the action of a catalyst, thereby purifying the exhaust gas.

[0058] like Figure 1 and Figure 2 As shown, the mixer includes a housing 100, which has an air inlet 110, an exhaust port 120, an intake chamber 130 communicating with the air inlet 110, and a mixing chamber 140 communicating with the exhaust port 120. The air inlet 110 is the interface connecting the mixer to the engine exhaust port upstream, and the exhaust port 120 is the interface connecting the mixer to the downstream device. Exhaust gas from the engine enters the intake chamber 130 through the air inlet 110, and then enters the mixing chamber 140 from the intake chamber 130. After undergoing an oxidation-reduction reaction in the intake chamber 130 and the mixing chamber 140, the gas is discharged from the exhaust port 120.

[0059] Furthermore, the housing 100 can also communicate with a urea nozzle, and the urea sprayed from the urea nozzle can enter the intake chamber 130. During operation, exhaust gas enters the intake chamber 130 from the intake port 110. Simultaneously, the urea nozzle sprays urea droplets into the intake chamber 130, and the urea droplets begin to decompose to produce ammonia after entering the intake chamber 130. During the gas flow, the exhaust gas carries urea droplets and flows from the intake chamber 130 into the mixing chamber 140. The exhaust gas and urea droplets are fully mixed in the mixing chamber 140, 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 120.

[0060] Specifically, please see Figures 1-3 The mixer also includes a nozzle seat 400, through which the urea nozzle is connected to the housing 100, thereby improving the stability of the connection between the urea nozzle and the housing 100.

[0061] In addition, such as Figure 3 As shown, the mixer also includes a baffle 500, which is disposed between the intake chamber 130 and the mixing chamber 140 and connected to the housing 100, thereby separating the intake chamber 130 and the mixing chamber 140 to prevent airflow mixing. Furthermore, the baffle 500 is welded to the housing 100 to improve the airflow separation effect between the intake chamber 130 and the mixing chamber 140, as well as the structural stability of the mixer.

[0062] In some embodiments, please continue to see Figure 3 The mixer also includes a baffle plate 600, which is disposed at the bottom of the mixing chamber 140. The baffle plate 600 splits the airflow entering the mixing chamber 140 from the intake chamber 130, forming a W-shaped airflow, thereby increasing the path of the airflow in the mixing chamber 140 and improving the mixing effect.

[0063] like Figures 1-3 As shown, the mixer also includes a front perforated plate 700 disposed on the exhaust port 120. The front perforated plate 700 has a perforated structure, which facilitates the uniform discharge of airflow from the mixing chamber 140.

[0064] like Figures 1-3As shown, the mixer also includes a primary swirl tube 200 and a connecting assembly 300. The primary swirl tube 200 is disposed in the air intake chamber 130, and one end of the primary swirl tube 200 is connected to the urea nozzle. The primary swirl tube 200 has a first air hole 211, which connects the air intake chamber 130 and the interior of the primary swirl tube 200. The connecting assembly 300 connects the primary swirl tube 200 and the mixing chamber 140. The connecting assembly 300 includes a secondary swirl tube 310 and an inner tube 320. The inner tube 320 is connected to the end of the primary swirl tube 200 away from the urea nozzle. The secondary swirl tube 310 is sleeved on the inner tube 320. The secondary swirl tube 310 has a second air hole 3111, which connects the air intake chamber 130 and the interior of the secondary swirl tube 310. The inner tube 320 has a third air hole 3221.

[0065] The mixer, with its first vent 211 and second vent 3111 corresponding to the air inlet, increases the airflow area into the primary cyclone tube 200 and the connecting component 300, which helps reduce airflow resistance and further increases airflow velocity. This increased airflow velocity enhances the airflow rate of urea droplets after they enter the primary cyclone tube 200 and the connecting component 300, while also extending the flow path of the urea droplets, accelerating their evaporation and decomposition, and improving their anti-crystallization ability.

[0066] Meanwhile, the secondary cyclone tube 310 and the inner tube 320 in the mixer work together effectively, greatly improving the mixer's mixing capacity. The gas velocity distribution within the inner tube 320 is more uniform, and the wall velocity is increased compared to existing structures. The fluid carries urea droplets, reducing urea deposition on the wall. Furthermore, the internal velocity of the inner tube 320 is relatively stable, maintaining a high velocity level even at the lower part of the connecting component 300, further reducing urea deposition.

[0067] As an alternative, the inner tube 320 and the first-stage cyclone tube 200 are integrally welded together, which helps to improve structural stability.

[0068] like Figure 2 and Figure 3 As shown, in some embodiments, the diameter of the first-stage swirl tube 200 gradually increases along the direction away from the urea nozzle, that is, the first-stage swirl tube 200 is a tapered tube. The tapered structure enables the airflow in the first-stage swirl tube 200 to flow obliquely towards the connecting component 300, effectively avoiding airflow collision, reducing back pressure, and helping to increase airflow velocity.

[0069] In some embodiments, see Figure 3 and Figure 4The primary cyclone tube 200 includes a primary tube body 210 and a primary guide vane 220. The primary tube body 210 has a first vent 211, which is a strip-shaped hole extending axially along the primary tube body 210. The primary guide vane 220 is connected to one side of the first vent 211. The primary guide vane 220 enables the airflow to form a rotating airflow within the primary cyclone tube 200. Combined with the tapered cross-section of the primary cyclone tube 200, the rotating airflow flows obliquely and rotatably towards the connecting component 300, which can reduce airflow collision, reduce back pressure, and reduce resistance. At the same time, the primary cyclone tube 200 increases the swirl velocity by generating a rotating airflow, which is beneficial for increasing the airflow velocity after the urea droplets enter the primary cyclone tube 200 and the connecting component 300. It also extends the flow path of the urea droplets, accelerates the evaporation and decomposition of the urea droplets, and helps to improve the anti-crystallization ability.

[0070] In some embodiments, the primary guide vane 220 folds inward toward the primary tube 210. Compared to folding outward toward the primary tube 210, this allows for the accommodation of a larger diameter primary tube 210 within the limited air intake cavity 130. This maximizes the intensity of the rotating airflow within the limited space, enhances mixing capacity, and increases the velocity airflow near the walls of the primary swirl tube 200 and the connecting component 300. During the reciprocating flow of the airflow inside and outside the third air hole 3221 of the inner tube 320, the inner tube 320 can evaporate and break up urea droplets impacting its wall, thereby improving the evaporation effect of the urea droplets and consequently enhancing the mixing effect.

[0071] During operation, the airflow enters the mixing chamber 140, and the inwardly folded first-stage guide vane 220 causes the airflow to rotate and flow downward along the inner tube 320. Urea droplets are injected into the mixing chamber 140 through the urea nozzle parallel to the airflow direction, and the vortex carries the urea droplets for mixing.

[0072] The conical first-stage swirling tube 200 and the inwardly folded first-stage guide vane 220 can reduce airflow collision and lower back pressure. On the other hand, the airflow swirling effect is better and the radial swirling speed is greater, which increases the airflow velocity and flow path near the urea droplet evaporation tube wall, accelerates the evaporation and decomposition of urea droplets, and helps to improve the anti-crystallization ability.

[0073] Please see Figure 4 and Figure 5In some embodiments, the primary cyclone tube 200 includes an arc-shaped protrusion 230 with multiple oblong holes 231 spaced circumferentially along the primary cyclone tube 200. The airflow within the primary cyclone tube 200 passes through the multiple oblong holes 231 at the protrusion, forming multiple small airflow streams. These dispersed small airflow streams can sweep away the low-speed regions between vortices. Because the mass of urea droplets is much greater than that of gas, urea droplets will remain and crystallize when the airflow flows through low-speed or stagnant regions. If these crystals cannot be completely decomposed in time, they will continue to grow using these as nuclei. Due to incomplete decomposition, urea crystal stones will eventually form, which, if accumulated to a certain extent, may block the urea flow channel.

[0074] Therefore, the waist-shaped hole 231 on the arc-shaped protrusion 230 can allow airflow to pass through, effectively avoiding the formation of airflow dead zones in low-speed areas and reducing the risk of urea crystallization in airflow dead zones.

[0075] The second vent 3111 and the third vent 3221 are strip-shaped holes extending axially along the secondary cyclone tube 310. This helps to increase the airflow area, reduce resistance, and thus improve the airflow velocity. It also helps to increase the airflow velocity after the urea droplets enter the primary cyclone tube 200 and the connecting component 300, accelerate the evaporation and decomposition of the urea droplets, and improve the anti-crystallization ability.

[0076] like Figure 3 , Figure 6 and Figure 7 As shown, in some embodiments, the secondary cyclone tube 310 includes a secondary tube body 311 and a secondary guide vane 312. The second air hole 3111 is a strip-shaped hole extending axially along the secondary tube body 311. The secondary guide vane 312 is connected to one side of the second air hole 3111 and folds outward toward the secondary tube body 311. The secondary guide vane 312 makes the rotation direction of the airflow in the secondary tube body 311 consistent with the rotation direction of the airflow in the primary cyclone tube 200. This structure of the secondary cyclone tube 310 causes the airflow to form a vortex after passing through the secondary guide vane 312, accelerating the airflow velocity between the secondary cyclone tube 310 and the inner tube 320, and making the velocity distribution between the secondary cyclone tube 310 and the inner tube 320 more uniform, reducing local flow dead zones, and reducing urea deposition on the wall of the inner tube 320. At the same time, the secondary guide vane 312 helps to avoid interference between the secondary guide vane 312 and the inner tube 320.

[0077] In addition, the rotating airflow generated by the secondary cyclone tube 310 and the rotating airflow generated by the primary cyclone tube 200 work together to ensure that the exhaust gas emitted by the engine is fully mixed with the ammonia generated by the decomposition of urea droplets in the mixer, thereby improving the conversion efficiency of the mixer in treating NOx in the exhaust gas and reducing the risk of urea crystallization and blockage in the mixer.

[0078] like Figure 3 , Figure 6 and Figure 7 As shown, the secondary cyclone tube 310 includes a first inclined portion 313, located at one end of the secondary cyclone tube 310 near the mixing chamber 140. Corresponding to the first inclined portion 313, the inner tube 320 includes a second inclined portion 321. The first inclined portion 313 and the second inclined portion 321 are inclined at their ends facing the mixing chamber 140, so that the lengths of the secondary cyclone tube 310 and the inner tube 320 gradually increase along the direction near the exhaust port 120. This mixer uses the first inclined portion 313 and the second inclined portion 321 to block the airflow from the connecting component 300, preventing the mixed gas from being directly discharged from the exhaust port 120. This helps to increase the flow path of the mixed gas in the mixing chamber 140, thereby improving the mixing effect.

[0079] Both the first inclined portion 313 and the second inclined portion 321 have exhaust holes 3131, so that some of the mixed gas can flow through the exhaust holes 3131 during the flow process, so as to break the urea droplets by using the exhaust holes 3131, thereby improving the mixing effect of urea droplets and waste gas.

[0080] In some embodiments, the density of exhaust holes 3131 on the side of the first inclined portion 313 and the second inclined portion 321 facing the exhaust port 120 is high, so that the mixed gas flows through the exhaust holes 3131 to the exhaust port 120 and then to the next structure.

[0081] Meanwhile, the high density of exhaust holes 3131 on both sides of the first inclined portion 313 and the second inclined portion 321 facing the exhaust port 120 is beneficial to allow the mixed gas in the connecting component 300 to be discharged into the mixing chamber 140 for thorough mixing, thereby increasing the gas path and improving the mixing effect.

[0082] The irregular distribution of the exhaust port 3131 is beneficial for adjusting the airflow distribution, thereby improving the uniformity of the flow before the mixer exhaust port 120.

[0083] like Figure 8 As shown, the inner tube 320 includes a body 322 and a transition section 323. A third vent 3221 is provided on the body 322. Along the direction away from the primary cyclone tube 200, the diameter of the transition section 323 gradually decreases, and the transition section 323 is connected to the primary cyclone tube 200. This transition section 323 helps to prevent uremic droplets from contacting the area between the inner tube 320 and the primary cyclone tube 200 and forming a permanent liquid film, thus reducing the risk of crystallization.

[0084] Please continue reading Figure 9The inner tube 320 also includes a support arm 324 located between the main body 322 and the secondary cyclone tube 310. The support arm 324 includes a connecting portion 3241 and a support portion 3242 connected at an angle. The connecting portion 3241 is connected to one side of the mounting port 3222, and the bending direction of the support portion 3242 is consistent with the airflow direction. That is, the connecting portion 3241 and the support portion 3242 are connected in an L-shape. The support portion 3242 extends in the direction of airflow, which helps to reduce the contact area of ​​urea droplets for deposition, thereby reducing the risk of crystallization and improving the reliability of the inner tube 320. In addition, the support arm 324 can abut against the inner wall of the secondary cyclone tube 310 to support the inner tube 320 and provide support for the inner tube 320.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, 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.

[0090] 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 mixer, characterized in that, include: The housing (100) has an air inlet (110), an air outlet (120), an air intake chamber (130) communicating with the air inlet (110), and a mixing chamber (140) communicating with the air outlet (120). A primary swirl tube (200) is disposed in the air intake chamber (130). One end of the primary swirl tube (200) is connected to a urea nozzle. The primary swirl tube (200) has a first air hole (211) that connects the air intake chamber (130) and the interior of the primary swirl tube (200). A connecting component (300) is connected between the primary cyclone tube (200) and the mixing chamber (140). The connecting component (300) includes a secondary cyclone tube (310) and an inner tube (320). The inner tube (320) is connected to the end of the primary cyclone tube (200) away from the urea nozzle. The secondary cyclone tube (310) is sleeved on the inner tube (320). The secondary cyclone tube (310) has a second vent (3111) that connects the air inlet chamber (130) and the interior of the secondary cyclone tube (310). The inner tube (320) has a third vent (3221).

2. The mixer according to claim 1, characterized in that, The diameter of the first-stage swirl tube (200) gradually increases in the direction away from the urea nozzle.

3. The mixer according to claim 1, characterized in that, The first-stage cyclone tube (200) includes: A primary tube (210) having a first vent (211), wherein the first vent (211) is a strip-shaped hole extending axially along the primary tube (210); and A primary guide vane (220) is connected to one side of the first air hole (211) and folded into the interior of the primary tube (210).

4. The mixer according to claim 1, characterized in that, The primary cyclone tube (200) includes an arc-shaped protrusion (230) having a plurality of waist-shaped holes (231) spaced apart circumferentially along the primary cyclone tube (200).

5. The mixer according to claim 1, characterized in that, The second vent (3111) and the third vent (3221) are strip-shaped holes extending axially along the secondary cyclone tube (310).

6. The mixer according to claim 1, characterized in that, The secondary cyclone tube (310) includes: The secondary tube body (311), wherein the second vent (3111) is a strip-shaped hole extending axially along the secondary tube body (311); and The secondary guide vane (312) is connected to one side of the second air hole (3111) and folds outward toward the secondary tube body (311). The secondary guide vane (312) makes the rotation direction of the airflow in the secondary tube body (311) consistent with the rotation direction of the airflow in the primary vortex tube (200).

7. The mixer according to claim 1, characterized in that, The secondary cyclone tube (310) includes: The first inclined portion (313) is located at one end of the secondary cyclone tube (310) near the mixing chamber (140). Corresponding to the first inclined portion (313), the inner tube (320) includes a second inclined portion (321). The first inclined portion (313) and the second inclined portion (321) are inclined at one end facing the mixing chamber (140), so that the length of the secondary cyclone tube (310) and the inner tube (320) gradually increases along the direction near the exhaust port (120).

8. The mixer according to claim 7, characterized in that, Both the first inclined portion (313) and the second inclined portion (321) have exhaust holes (3131).

9. The mixer according to claim 1, characterized in that, The inner tube (320) includes: The body (322), wherein the third vent (3221) is disposed on the body (322); and The transition section (323) has a gradually decreasing diameter along the direction away from the first-stage cyclone tube (200), and the transition section (323) is connected to the first-stage cyclone tube (200).

10. The mixer according to claim 9, characterized in that, The body (322) has a mounting port (3222), and the inner tube (320) further includes: A support arm (324) is located between the main body (322) and the secondary cyclone tube (310). The support arm (324) includes a connecting part (3241) and a support part (3242) connected at an angle. The connecting part (3241) is connected to one side of the mounting port (3222), and the bending direction of the support part (3242) is consistent with the airflow direction.

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