Mixer and post-processing device

Abstract

The utility model discloses a mixer and an aftertreatment device, the mixer comprises a shell, a rotational flow assembly and a mixing pipe, and the rotational flow assembly and the mixing pipe are arranged in the shell. The shell comprises an inner shell body and an outer shell body, an inner cavity of the inner shell body is used for installing the rotational flow assembly and the mixing pipe, and an inner cavity of the outer shell body is used for being inserted into the inner shell body. The outer shell of the shell is fixedly connected with the post-treatment box, the inner shell of the shell is connected with the outer shell in an inserted mode, and the inner shell can be taken out of the outer shell according to requirements so that the rotational flow assembly and the mixing pipe in the inner shell can be maintained. The maintenance difficulty of the mixer is reduced; through cooperation of the rotational flow assembly and the mixing pipe, the mixing path of waste gas and the urea water solution can be effectively increased, the mixing decomposition time of the tail gas and the urea water solution is prolonged, it is guaranteed that NH3 and the urea water solution are evenly mixed, urea crystallization is effectively prevented, and the emission requirement is met.

Description

Technical Field

[0001] This application relates to the technical field of engine aftertreatment, and particularly relates to a mixer and an aftertreatment device. Background Art

[0002] The principle of SCR technology is to utilize NH generated by the high-temperature decomposition of aqueous urea solution. 3 , which reacts with NOx under the action of a catalyst to produce N 2 , thereby reducing NOx in the exhaust gas to meet the National VI emission standards. Usually, the mixer is arranged in front of the SCR, and the exhaust gas passes through the DOC (Diesel Oxidation Catalyst), DPF (Diesel Particulate Filter), mixer, and SCR (Selective Catalytic Reduction) and then is discharged into the atmosphere. The main function of the mixer is to break up the aqueous urea solution to form smaller urea particles and evenly mix the exhaust gas and urea particles.

[0003] In the related art, the housing of the mixer is welded to the aftertreatment box, which is not conducive to the maintenance work when the mixer is blocked due to urea crystallization or the like during operation.

[0004] At the same time, in the related art, the structure of the mixing blades of the mixer is simple, which is not conducive to the evaporation of the aqueous urea solution, resulting in easy crystallization of urea on the mixing blades and the surrounding areas, causing blockage of the mixer.

[0005] Therefore, how to solve the above problems has become an urgent technical problem for those skilled in the art. Utility Model Content

[0006] This application provides a mixer to reduce the maintenance difficulty of the mixer and at the same time reduce the risk of mixer blockage. This application also provides an aftertreatment device.

[0007] To achieve the above object, this application provides a mixer, including a housing, a swirl assembly, and a mixing pipe.

[0008] The housing includes an inner housing and an outer housing. The swirl assembly and the mixing pipe are arranged in the inner cavity of the inner housing.

[0009] The inner housing is inserted into the outer housing, and the outer housing is provided with a limiting portion for limiting the insertion depth of the inner housing.

[0010] The outer shell is fixedly connected to the post-treatment box. The inner shell is pressed against the limiting part through the diversion shell, and the outer shell can be detachably connected to the diversion shell.

[0011] Preferably, in the above-mentioned mixer, the limiting part is arranged at one end of the outer shell close to the diversion shell. The limiting part is a first limiting step, and the diameter of one end of the first limiting step close to the diversion shell is larger than the diameter of the end of the first limiting step far from the diversion shell.

[0012] A limiting convex ring is arranged on the inner shell and abuts against the first step surface of the first limiting step.

[0013] Preferably, in the above-mentioned mixer, the limiting part is arranged at one end of the outer shell far from the diversion shell. The limiting part is a second limiting step, and the diameter of one end of the second limiting step close to the diversion shell is larger than the diameter of the end of the second limiting step far from the diversion shell.

[0014] One end of the inner shell far from the diversion shell can abut against the second step surface of the second limiting step.

[0015] Preferably, in the above-mentioned mixer, limiting protrusions are arranged on the inner wall of the outer shell, and limiting grooves are arranged on the outer wall of the inner shell. The outer shell and the inner shell are matched through the limiting protrusions and the limiting grooves to circumferentially limit the inner shell.

[0016] Preferably, in the above-mentioned mixer, the swirl component is closer to the diversion shell than the mixing tube. The swirl component includes a swirl tube and a swirl plate, and the swirl plate is located between the swirl tube and the mixing tube.

[0017] First swirl holes are arranged in the circumferential direction of the swirl tube, and a first swirl piece is arranged on one side of the first swirl holes.

[0018] The diameter of the swirl plate is larger than the diameters of the swirl tube and the mixing tube. The swirl plate has a central opening communicating with the swirl tube, and second swirl holes are arranged between the edge of the swirl plate and the central opening. Second swirl pieces are arranged on one side of the second swirl holes.

[0019] Preferably, in the above-mentioned mixer, at least two circles of first swirl holes are arranged on the swirl tube along the axial direction of the swirl tube.

[0020] Preferably, in the above-mentioned mixer, the diameter of the end of the swirl tube far from the swirl plate is smaller than the diameter of the end of the swirl tube close to the swirl plate.

[0021] Preferably, in the above-mentioned mixer, the flow area of the holes at one end of the mixing tube close to the cyclone assembly is smaller than the flow area of the holes at the other end of the mixing tube far from the cyclone assembly.

[0022] Preferably, in the above-mentioned mixer, a support spring piece is provided at one end of the mixing tube far from the cyclone assembly, and a plurality of the support spring pieces are arranged along the circumferential direction of the mixing tube. The mixing tube is in interference fit with the inner shell through the support spring pieces.

[0023] A post-treatment device includes a mixer, and the mixer is the mixer described in any one of the above.

[0024] The mixer provided by the embodiment of the present application includes a shell, a cyclone assembly and a mixing tube. The cyclone assembly and the mixing tube are arranged in the shell. The shell includes an inner shell and an outer shell. Both the outer shell and the inner shell have inner cavities. The inner cavity of the inner shell is used to install the cyclone assembly and the mixing tube, and the inner cavity of the outer shell is used to insert the inner shell. The outer shell of the shell is fixedly connected to the post-treatment box, which not only realizes the connection between the mixer and the post-treatment box, but also provides an installation basis for the whole composed of the inner shell, the cyclone assembly and the mixing tube. The inner shell of the shell is connected to the outer shell in a plug-in manner, and the inner shell can be taken out of the outer shell according to needs to repair the cyclone assembly and the mixing tube inside the inner shell. Compared with the related technology in which the shell of the mixer with cyclone vanes is fixedly connected to the post-treatment, the maintenance difficulty of the mixer is reduced;

[0025] In the present application, through the cooperation of the cyclone assembly and the mixing tube, the mixing path of the exhaust gas and the urea aqueous solution can be effectively increased, the mixing and decomposition time of the tail gas and the urea aqueous solution can be prolonged, and the uniform mixing of NH 3 and the urea aqueous solution can be ensured, effectively preventing urea crystallization and meeting the emission requirements.

[0026] The present application also discloses a post-treatment device, including a mixer, and the mixer is the mixer described in any one of the above solutions. Since the mixer has the above technical effects, the post-treatment device with this mixer also has the same technical effects, which will not be elaborated here. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings, and the present application can also be applied to other similar scenarios according to the provided drawings. Unless it is obvious from the language environment or otherwise stated, the same reference numerals in the drawings represent the same structure or operation.

[0028] Figure 1 It is a schematic structural diagram of the connection between the mixer and the post-treatment box of this application;

[0029] Figure 2 It is a schematic structural diagram of the mixer of this application;

[0030] Figure 3 It is a schematic structural diagram of the inner tube of the mixer of this application;

[0031] Figure 4 It is a schematic structural diagram of the outer tube of the mixer of this application;

[0032] Figure 5 It is a schematic structural diagram of the mixing tube of the mixer of this application;

[0033] Figure 6 It is a schematic structural diagram of the swirl tube of the mixer of this application;

[0034] Figure 7 It is a schematic structural diagram of the swirl plate of the mixer of this application.

[0035] The description of the attached drawings is as follows:

[0036] 1 - Inner housing; 11 - Limit convex ring; 2 - Outer housing; 21 - First limit step; 22 - Second limit step; 3 - Mixing tube; 31 - Support spring piece; 4 - Post-treatment box; 5 - Swirl tube; 51 - First swirl hole; 52 - First swirl piece; 6 - Swirl plate; 61 - Central opening; 62 - Second swirl hole; 63 - Second swirl piece; 7 - Flow guide shell. Detailed implementation manners

[0037] The following further elaborates on this application in conjunction with the attached drawings and embodiments. It can be understood that the specific embodiments described herein are merely used to explain the relevant application and do not limit the application. The described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

[0038] It should be noted that for the sake of convenience of description, only the parts related to the relevant application are shown in the attached drawings. Without conflict, the embodiments and the features in the embodiments of this application can be arbitrarily combined with each other, as long as the combined technical features are not mutually contradictory. All feasible feature combinations are the technical contents clearly recorded herein. Any one of the multiple sub-features included in the same statement can be independently applied without necessarily being applied together with other sub-features.

[0039] As shown in this application and the claims, unless the context clearly indicates otherwise, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. A method or device may also include other steps or elements. An element defined by the statement "comprising one..." does not exclude the existence of other identical elements in the process, method, commodity, or device that includes the element.

[0040] Among them, in the description of the embodiments of this application, unless otherwise specified, " / " means "or". For example, A / B can mean A or B; "and / or" herein is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "a plurality of" means two or more than two.

[0041] Please refer to Figures 1-7 。

[0042] Some embodiments of this application disclose a mixer, including a housing, a swirl component, and a mixing tube 3. The swirl component and the mixing tube 3 are arranged inside the housing.

[0043] The exhaust gas discharged from the engine enters the mixer after flowing through the DPF. At the same time, the aqueous urea solution is sprayed into the mixer through the urea nozzle. The exhaust gas and the aqueous urea solution rotate at high speed under the action of the swirl component, and after being fully mixed, enter the mixing tube 3. The combination of the swirl component and the mixing tube 3 can effectively increase the mixing path of the exhaust gas and the aqueous urea solution, extend the mixing and decomposition time of the exhaust gas and the aqueous urea solution, ensure that NH 3 is uniformly mixed with the aqueous urea solution, effectively prevent urea crystallization, and meet the emission requirements.

[0044] In some embodiments, the housing includes an inner housing 1 and an outer housing 2. Both the inner housing 1 and the outer housing 2 are hollow housings. The outer housing 2 and the inner housing 1 both have inner cavities. The inner cavity of the inner housing 1 is used to arrange the swirl component and the mixing tube 3, and the inner cavity of the outer housing 2 is used to insert the inner housing 1.

[0045] The outer housing 2 of the housing is fixedly connected to the aftertreatment box 4, which not only realizes the connection between the mixer and the aftertreatment box 4, but also provides an installation basis for the whole composed of the inner housing 1, the swirl component, and the mixing tube 3. The inner housing 1 of the housing is inserted and connected to the outer housing 2, and the inner housing 1 can be taken out of the outer housing 2 according to needs to repair the swirl component and the mixing tube 3 inside the inner housing 1. Compared with the related technology in which the housing with swirl vanes of the mixer is fixedly connected to the aftertreatment, the maintenance difficulty of the mixer is reduced.

[0046] The outer housing 2 and the inner housing 1 are coaxially arranged. In this solution, the two ends of the outer housing 2 in the axial direction are respectively named the first end and the second end, where the first end is the end of the outer housing 2 close to the guide housing 7, and the second end is the end of the outer housing 2 far from the guide housing 7; the two ends of the inner housing 1 in the axial direction are respectively named the first end and the second end, where the first end is the end of the inner housing 1 close to the guide housing 7, and the second end is the end of the inner housing 1 far from the guide housing 7. As Figure 3 and Figure 4 shown, the first end and the second end of the outer housing 2, as well as the first end and the second end of the inner housing 1 are all open ends. The first end of the outer housing 2 is used for the inner housing 1 to be inserted, and the second end of the outer housing 2 is used for the mixture of NH 3 and exhaust gas to be discharged. The first end of the inner housing 1 is used for the swirl assembly and the mixing pipe 3 to be loaded. The second end of the inner housing 1 is connected to the second end of the outer housing 2 and is used for the mixture of NH 3 and exhaust gas to be discharged.

[0047] The inner housing 1 and the outer housing 2 are connected in a plug-in manner. In order to ensure the mating depth of the inner housing 1 and the outer housing 2 along their own axial directions, a limiting portion is provided on the outer housing 2 in this solution. The depth of the inner housing 1 inserted into the outer housing 2 is limited by the limiting portion to prevent the inner housing 1 from sliding out from the second end of the outer housing 2; at the same time, in this solution, after the guide housing 7 is snap-connected to the outer housing 2, the guide housing 7 abuts against the first end of the inner housing 1 to press the inner housing 1 against the limiting portion, and the guide housing 7 cooperates with the limiting portion to achieve axial limitation of the inner housing 1.

[0048] The fixed connection method between the outer housing 2 and the aftertreatment box 4 is optionally a welded connection.

[0049] As Figure 1 shown, part of the swirl assembly is located inside the guide housing 7 and part is located inside the inner housing 1, and the mixing pipe 3 is located inside the inner housing 1.

[0050] In some embodiments, the swirl assembly and the mixing pipe 3 are welded together to form a whole and then loaded into the inner housing 1. The whole formed by welding the swirl assembly and the mixing pipe 3 is non-fixedly connected to the inner housing 1 to ensure that the whole formed by welding the swirl assembly and the mixing pipe 3 can be disassembled from the inner housing 1. After the swirl assembly and the mixing pipe 3 are connected together, their relative positions are fixed, and the whole has a certain length, which can reduce the assembly difficulty of the overall structure composed of the swirl assembly and the mixing pipe 3 and the inner housing 1.

[0051] In some embodiments, the swirl assembly is closer to the guide housing 7 relative to the mixing pipe 3, or rather, the swirl assembly is closer to the first end of the inner housing 1 relative to the mixing pipe 3. The swirl assembly includes a swirl pipe 5 and a swirl plate 6, and the swirl plate 6 is located between the swirl pipe 5 and the mixing pipe 3. As Figure 1As shown in the figure, along the axial direction of the inner housing 1, the cyclone tube 5, the cyclone plate 6, and the mixing tube 3 are arranged in sequence. The exhaust gas and urea particles pass through the cyclone tube 5, the cyclone plate 6, and the mixing tube 3 in sequence. Compared with the related art where mixing vanes are only arranged in the middle of the mixer, the structure for promoting the mixing of the exhaust gas and urea particles is increased, the uniformity of the mixing of the exhaust gas and urea particles is improved, and the risk of crystallization is reduced.

[0052] The cyclone assembly includes a cyclone tube 5 and a cyclone plate 6. A plurality of first cyclone holes 51 are formed in the circumferential direction of the cyclone tube 5. One side of the first cyclone hole 51 is provided with a first cyclone vane 52, and the first cyclone vane 52 and the first cyclone hole 51 enclose a first cyclone port. As Figure 6 shown, the first cyclone holes 51 are formed along the axial direction of the cyclone tube 5, and the cyclone tube 5 has a certain length along the axial direction of the inner housing 1, so that the first cyclone holes 51 formed on the cyclone tube 5 have a larger flow area, increasing the intake air volume entering the cyclone tube 5 through the cyclone holes per unit time, reducing the back pressure of the mixer to a certain extent, and reducing energy consumption; at the same time, the swirling path of the gas entering the cyclone tube 5 is extended, which is beneficial to the uniformity of the air flow distribution in the cyclone tube 5 and improves the conversion efficiency of nitrogen oxides.

[0053] Under the action of the cyclone vanes of the cyclone tube 5, the exhaust gas rotates strongly, driving the sprayed urea aqueous solution to rotate and mix together, reducing the probability of the urea solution being sprayed onto the wall surface of the inner housing 1 and reducing the risk of urea crystallization.

[0054] In this solution, the diameter of the cyclone plate 6 is larger than that of the cyclone tube 5. A central opening 61 communicating with the cyclone tube 5 is formed on the cyclone plate 6. The exhaust gas entering the cyclone tube 5 can enter the mixing tube 3 through the central opening 61; a second cyclone hole 62 is arranged between the edge of the cyclone plate 6 and the central opening 61, and a second cyclone vane 63 is arranged on one side of the second cyclone hole 62. A part of the tail gas entering the mixer enters the cyclone tube 5, and the other part is located between the cyclone tube 5 and the inner housing 1. The exhaust gas located between the cyclone tube 5 and the inner housing 1 enters the space between the mixing tube 3 and the inner housing 1 through the cyclone plate 6, forming a high-speed rotating air flow between the mixing tube 3 and the inner housing 1. Specifically, the air flow entering the mixing tube 3 through the cyclone tube 5 and the air flow entering the space between the mixing tube 3 and the inner housing 1 through the cyclone plate 6 form two high-speed rotating air flows inside and outside the mixing tube 3. The two high-speed rotating air flows can flow through each other through the holes on the mixing tube 3, accelerating the collision and decomposition of urea particles, making the mixing of urea and tail gas more uniform, and effectively ensuring the velocity uniformity and ammonia distribution uniformity of the gas entering the SCR to meet the emission standards.

[0055] As Figure 7 shown, the second cyclone vane 63 is inclined towards the mixer from the cyclone plate 6.

[0056] At least one end of the first end and the second end of the outer housing 2 is provided with a limiting portion. Specifically, the limiting portion can be provided only at the first end of the outer housing 2, or at the second end of the outer housing 2, or at both the first end and the second end of the outer housing 2 simultaneously.

[0057] In some embodiments, a limiting portion is provided at the first end of the outer housing 2. The limiting portion is a first limiting step 21. The diameter of the first limiting step 21 at the end close to the diversion housing 7 is greater than the diameter of the first limiting step 21 at the end far from the diversion housing 7. Correspondingly, a limiting convex ring 11 that abuts against the first step surface of the first limiting step 21 is provided on the inner housing 1. As Figure 1 、 Figure 2 and Figure 4 shown, the first limiting step 21 is L-shaped, and an arc-shaped protrusion having the same shape as the first limiting step 21 is formed on the outer wall of the outer housing 2. After the inner housing 1 is inserted into the outer housing 2, the limiting convex ring 11 of the inner housing 1 is exactly located on the step surface of the first step surface. A groove corresponding to the position of the limiting convex ring 11 and having a matching shape is provided on the diversion housing 7, and a protrusion is formed on the outer wall of the diversion housing 7 at the position corresponding to the groove. The diversion housing 7 is stuck on the first step surface of the outer housing 2 and the limiting convex ring 11 through the groove, pressing the limiting convex ring 11 against the first step surface to realize the connection of the diversion housing 7, the outer housing 2, and the inner housing 1. The clamp cooperates with the protrusion of the diversion housing 7 to realize the locking connection of the diversion housing 7, the outer housing 2, and the inner housing 1.

[0058] A groove is provided on the inner wall of the inner housing 1 corresponding to the limiting convex ring 11, and a worker can insert a hand into the groove to pull out the inner housing 1 from the outer housing 2, further reducing the difficulty of disassembling the inner housing 1 from the outer housing 2.

[0059] In some embodiments, a limiting portion is provided at the second end of the outer housing 2. The limiting portion is a second limiting step 22. The diameter of the second limiting step 22 at the end close to the diversion housing 7 is greater than the diameter of the second limiting step 22 at the end far from the diversion housing 7. After the inner housing 1 is inserted into the outer housing 2, the second end of the inner housing 1 abuts against the second step surface of the second limiting step 22.

[0060] As Figure 4 shown, the second step surface inclines away from the diversion housing 7 relative to the side wall of the inner housing 1, and the inclined surface of the second step surface abuts against the second end of the inner housing 1.

[0061] In some embodiments, a first limiting step 21 is provided at the first end of the outer housing 2, and a second limiting step 22 is provided at the second end of the outer housing 2. After the inner housing 1 is inserted into the outer housing 2, the limiting convex ring 11 of the inner housing 1 abuts against the first step surface of the first limiting step 21, and the second end of the inner housing 1 abuts against the second step surface of the second limiting step 22. The first limiting step 21 and the second limiting step 22 cooperate to limit the inner housing 1 in the axial direction to prevent the inner housing 1 from moving excessively towards the mixing pipe 3.

[0062] The movement of the inner housing 1 towards the mixing pipe 3 is limited by the limiting portion, and the movement of the inner housing 1 away from the mixing pipe 3 is limited by the diversion housing 7.

[0063] The limiting portion is not limited to the above structural form, and can also be the cooperation of a limiting protrusion and a limiting block, or a threaded fit, etc., which is not specifically limited herein.

[0064] In some embodiments, at least two circles of first swirl holes 51 are provided in the axial direction of the swirl pipe 5. The lengths of the first swirl holes 51 at different axial positions of the swirl pipe 5 in the axial direction of the swirl pipe 5 can be equal or unequal, and the sizes and angles of the first swirl vanes 52 can also be customized according to the application scenario.

[0065] The swirl vanes and swirl holes are prone to deformation under the thermal shock of the high-temperature airflow in the engine, resulting in the fracture and failure of the swirl vanes. In this solution, by providing multiple circles of first swirl holes 51 and first swirl vanes 52, the lengths of the first swirl holes 51 and first swirl vanes 52 in the axial direction of the swirl pipe 5 are shortened to a certain extent, the self-strength is increased, and the ability to resist deformation under the thermal shock of the high-temperature airflow is enhanced.

[0066] The first swirl holes 51 are provided at different positions in the axial direction of the swirl pipe 5, which can enhance the uniformity of the air intake at various parts of the swirl pipe 5.

[0067] When the exhaust gas passes through the swirl pipe, it will rotate rapidly along the axis of the swirl pipe under the action of the first swirl holes 51 and the first swirl vanes 52. At the same time, the aqueous urea solution enters along the radial direction of the swirl pipe. The rapidly rotating exhaust gas will accelerate the collision and fragmentation of the aqueous urea solution particles, making the mixture more uniform, thereby achieving the effects of reducing emissions and preventing urea crystallization.

[0068] In some embodiments, the swirl pipe 5 can be a cylindrical pipe or a conical pipe. In the embodiment where the swirl pipe 5 is a conical pipe, the diameter of the end of the swirl pipe 5 away from the swirl plate 6 is smaller than the diameter of the end of the swirl pipe 5 close to the swirl plate 6. The swirl pipe 5 is selected as a conical pipe because the conical pipe is more suitable for the spray shape of urea, and at the same time enhances the stability of the landing point of the urea spray beam, preventing it from being blown off by the airflow and affecting the uniformity of the mixture.

[0069] At different positions in the axial direction of the mixing tube 3, the flow areas of the holes formed in the mixing tube 3 may be the same or different.

[0070] As Figure 5 shown, a circular hole is formed at one end of the mixing tube 3 close to the swirl component, and a long-strip hole is formed at the other end of the mixing tube 3 far from the swirl component. The flow area of the circular hole is smaller than that of the long-strip hole. The axial length of the mixing tube 3 for forming the long-strip hole is greater than the axial length of the mixing tube 3 for forming the circular hole. In some embodiments, circular holes are formed in at least one-fourth of the overall length of the mixing tube 3, and multiple circles of circular holes are arranged along the axial direction of the mixing tube 3. The remaining length of the overall length of the mixing tube 3 is provided with long-strip holes, and multiple circles of long-strip holes are arranged along the axial direction of the mixing tube 3.

[0071] In some embodiments, along the axial direction of the mixing tube 3, the flow area of the holes may gradually increase. The increase in the flow area of the holes may be achieved by changing the shape of the holes, changing the size of the holes, or changing both the shape and size of the holes simultaneously.

[0072] The outer diameter of the swirl plate 6 of the swirl component is greater than or equal to the inner diameter of the inner circumference of the inner housing 1. When the overall assembly composed of the swirl component and the mixer is installed in the inner housing 1, the inner wall of the inner housing 1 can cooperate with the swirl plate 6 to guide the overall assembly composed of the swirl component and the mixer, further reducing the installation difficulty.

[0073] A support spring piece 31 is arranged at the end of the mixing tube 3 far from the swirl component. The support spring piece 31 can abut against the inner wall of the inner housing 1 to achieve an interference fit connection between the mixing tube 3 and the inner housing 1. Optionally, the support spring pieces 31 are evenly distributed along the circumferential direction of the mixing tube 3 to achieve stable fixation of the mixing tube 3 in the inner housing 1.

[0074] In some embodiments, a limiting protrusion is arranged on the inner wall of the outer housing 2, and a limiting groove is arranged on the outer wall of the inner housing 1. The outer housing 2 and the inner housing 1 are matched through the limiting protrusion and the limiting groove to perform circumferential limitation on the inner housing 1 to prevent the inner housing 1 from performing circumferential movement relative to the outer housing 2.

[0075] The present application also discloses a post-treatment device, including a mixer, and the mixer is the mixer described in any one of the above solutions.

[0076] Since the mixer has the above technical effects, the post-treatment device having the mixer also has the same technical effects, which will not be elaborated herein.

[0077] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles, and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and modifications. The scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above application concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. A mixer, characterized in that: It comprises a shell, a swirl assembly and a mixing tube (3), The shell comprises an inner shell (1) and an outer shell (2), the inner cavity of the inner shell (1) being provided with the swirl assembly and the mixing tube (3), The inner shell (1) is inserted into the outer shell (2), and the outer shell (2) is provided with a limiting portion for limiting the insertion depth of the inner shell (1). The outer shell (2) is fixedly connected to the post-processing box (4), the inner shell (1) is pressed onto the limiting portion via a flow guide shell (7), and the outer shell (2) can be detachably connected to the flow guide shell (7).

2. The mixer according to claim 1, characterized in that The limiting portion is provided at one end of the outer shell (2) close to the guide shell (7), and the limiting portion is a first limiting step (21). The diameter of the end of the first limiting step (21) close to the guide shell (7) is greater than the diameter of the end of the first limiting step (21) away from the guide shell (7). The inner shell (1) is provided with a limiting convex ring (11) which abuts against the first step surface of the first limiting step (21).

3. The mixer according to claim 1 or 2, characterized in that The limiting portion is provided at one end of the outer shell (2) away from the guide shell (7), the limiting portion being a second limiting step (22), the diameter of the end of the second limiting step (22) close to the guide shell (7) being larger than the diameter of the end of the second limiting step (22) away from the guide shell (7), One end of the inner shell (1) away from the guide shell (7) can abut against the second step surface of the second limiting step (22).

4. The mixer according to claim 3, characterized in that The inner wall of the outer shell (2) is provided with a limiting protrusion, and the outer wall of the inner shell (1) is provided with a limiting groove. The outer shell (2) and the inner shell (1) cooperate with each other through the limiting protrusion and the limiting groove to limit the inner shell (1) in a circumferential direction.

5. The mixer according to claim 1, characterized in that The swirl assembly is located close to the guide shell (7) relative to the mixing tube (3), the swirl assembly comprises a swirl tube (5) and a swirl plate (6), and the swirl plate (6) is located between the swirl tube (5) and the mixing tube (3). The cyclone tube (5) is provided with a first cyclone hole (51) on its circumference, and a first cyclone sheet (52) is provided on one side of the first cyclone hole (51). The diameter of the swirl plate (6) is greater than the diameters of the swirl tube (5) and the mixing tube (3); the swirl plate (6) has a central opening (61) connected to the swirl tube (5); a second swirl hole (62) is arranged between the edge of the swirl plate (6) and the central opening (61); and a second swirl sheet (63) is arranged on one side of the second swirl hole (62).

6. The mixer according to claim 5, characterized in that At least two circles of first swirl holes (51) are arranged on the swirl tube (5) along the axial direction of the swirl tube (5).

7. The mixer according to claim 5 or 6, characterized in that The diameter of the end of the swirl tube (5) away from the swirl plate (6) is smaller than the diameter of the end of the swirl tube (5) close to the swirl plate (6).

8. The mixer according to claim 1 or 5, characterized in that The flow area of ​​the hole at one end of the mixing tube (3) close to the swirl component is smaller than the flow area of ​​the hole at one end of the mixing tube (3) far from the swirl component.

9. The mixer according to claim 1 or 5, characterized in that: A supporting spring (31) is provided at one end of the mixing tube (3) away from the swirl assembly, and a plurality of supporting springs (31) are provided along the circumference of the mixing tube (3). The mixing tube (3) is interference-fitted with the inner shell (1) via the supporting springs (31).

10. A post-processing device, characterized in that: The invention comprises a mixer, wherein the mixer is the mixer according to any one of claims 1 to 9.

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