Mixing device

Abstract

The invention relates to a mixing device which comprises a mixer assembly, a flow guide cavity assembly, a mixer upper heat insulation cover assembly and a mixer lower heat insulation cover assembly, the mixer assembly is installed on the flow guide cavity assembly, and the mixer upper heat insulation cover assembly and the mixer lower heat insulation cover assembly are buckled on the outer side of the mixer assembly. The mixer upper heat shield assembly and the mixer lower heat shield assembly are connected with a mixer cylinder of the mixer assembly in a welded mode. The mixing device is good in discharge performance, high in crystallization resistance, capable of reducing crystallization risks, high in mixer heat utilization rate and wide in universality and adaptability, a new mixing scheme can be formed by adjusting the relative positions, angles and the like of the mixer assembly and the flow guide cavity assembly according to different structural forms, and the mixing efficiency is improved. And moreover, parts among different mixer schemes can be universalized.

Description

Technical Field

[0001] The invention relates to the field of motor vehicle catalytic muffler components, in particular to the field of a mixing device for fully mixing and pyrolyzing a urea aqueous solution with exhaust gas, specifically a mixing device. Background Art

[0002] At present, with the continuous upgrading of emission regulations, which are becoming more and more stringent and the full implementation of the current National VI emission regulations, the integration and structure of catalytic muffler components for motor vehicles are becoming more and more complex. In particular, in order to further reduce fuel consumption, some engines have cancelled the EGR device, resulting in higher original emissions, causing the emission performance of catalytic muffler components to be unstable and easy to crystallize, making development difficult, especially in medium and heavy-duty commercial vehicles. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a mixing device that meets the requirements of good discharge performance, strong anti-crystallization ability, versatility and wide adaptability.

[0004] In order to achieve the above object, the mixing device of the present invention is as follows:

[0005] The main features of the mixing device are that the device includes a mixer assembly, a flow guide cavity assembly, an upper heat shield assembly of the mixer and a lower heat shield assembly of the mixer, the mixer assembly is installed on the flow guide cavity assembly, the upper heat shield assembly of the mixer and the lower heat shield assembly of the mixer are buckled on the outside of the mixer assembly, the upper heat shield assembly of the mixer and the lower heat shield assembly of the mixer are welded and connected to the mixer barrel of the mixer assembly; the mixer assembly includes an air inlet end of the mixer assembly, the flow guide cavity assembly includes an air outlet end of the flow guide cavity assembly, the air inlet end of the mixer assembly is inserted into the air outlet end of the flow guide cavity assembly at a certain angle, and is welded around the connection.

[0006] Preferably, the mixer assembly includes a mixer unit, a nozzle mounting seat, a mixer barrel and a mixer orifice plate, the mixer barrel is placed horizontally and one end is connected to the mixer unit, the nozzle mounting seat is installed on the side wall of the mixer barrel, the mixer orifice plate is installed at the front end of the mixer barrel, and the mixer barrel is used to weld the mixer unit, the nozzle mounting seat and the mixer orifice plate into a whole.

[0007] Preferably, the guide chamber assembly includes a guide chamber bottom plate, an inner shell of the guide chamber, guide chamber thermal insulation cotton, an outer thermal insulation cover and a sensor seat. The sensor seat is welded to the inner shell of the guide chamber. The inner shell of the guide chamber and the outer thermal insulation cover are matched in shape and welded to form the guide chamber body. The inner shell of the guide chamber and the outer thermal insulation cover are filled with guide chamber thermal insulation cotton.

[0008] Preferably, the guide cavity bottom plate includes an air inlet end and an air outlet end of the guide cavity bottom plate, the mixer cylinder includes an air inlet end and an air outlet end of the mixer cylinder, the air inlet end of the mixer cylinder is matched and connected with the air outlet end of the guide cavity bottom plate, the air inlet end of the guide cavity bottom plate is matched and connected with the previous stage product; the air outlet end of the mixer cylinder is matched and connected with the subsequent stage product.

[0009] Preferably, the air inlet end of the guide cavity bottom plate and the air outlet end of the guide cavity bottom plate are trumpet-shaped, flange-shaped or hump-shaped interfaces.

[0010] Preferably, the mixer unit comprises a first mixer unit or a second mixer unit, the first mixer unit comprises a mixer upper baffle, a swirl tube, a steel mesh assembly, a mixer front baffle and a mixer rear baffle, and the mixer upper baffle, the swirl tube, the steel mesh assembly, the mixer front baffle and the mixer rear baffle are welded together;

[0011] The second mixer unit comprises a mixer upper baffle, a swirl tube, a steel mesh assembly, a mixer lower baffle and a mixer upper baffle, and the mixer upper baffle, the swirl tube, the steel mesh assembly, the mixer lower baffle and the mixer upper baffle are welded together; the mixer upper baffle converges the airflow into the swirl tube.

[0012] Preferably, the swirl tube is a conical or cylindrical mixer tube, and the periphery of the swirl tube is provided with a plurality of fins inclined at a certain angle for forming a swirl.

[0013] Preferably, the steel wire mesh assembly is a welded assembly of an inner steel wire mesh and an outer circular cylinder, which is used to fully mix and pyrolyze the urea aqueous solution with the exhaust gas.

[0014] Preferably, the mixer front baffle, mixer front and rear plates, mixer lower baffle and mixer upper baffle are all plates of a certain shape, used to divide and block the airflow, and guide the airflow to pass through.

[0015] Preferably, the mixer orifice plate is a perforated plate for adjusting the uniformity of the airflow and ammonia after flowing through the orifice plate.

[0016] The mixing device of the present invention has good emission performance. Since the internal mixer space is large, it is very easy to adjust the uniformity of airflow distribution and ammonia distribution. Therefore, the emission performance of the catalytic muffler component using this mixer is good. The present invention has strong anti-crystallization ability, and the uniform airflow distribution of the mixer is beneficial to the evaporation and pyrolysis of urea, which can reduce the risk of crystallization; at the same time, the thermal utilization rate of the mixer is relatively high, especially the lower baffle of the mixer in the second mixer unit scheme. During use, the inner and outer surfaces of the lower baffle of the mixer are well heated by the airflow, which is very beneficial to the evaporation and pyrolysis of urea. The present invention has wide versatility and adaptability. According to different structural forms, the relative position and angle of the mixer assembly and the guide cavity assembly can be adjusted to form a new mixing scheme, and the components between different mixer schemes can be universalized. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the gas inlet and outlet of the first embodiment of the mixing device of the present invention.

[0018] Figure 2 Schematic diagram of the gas inlet and outlet of the second embodiment of the mixing device of the present invention.

[0019] Figure 3 It is a schematic structural diagram of a first embodiment of a mixing device of the present invention.

[0020] Figure 4 It is a schematic structural diagram of a second embodiment of the mixing device of the present invention.

[0021] Figure 5 It is a schematic structural diagram of a first embodiment of a mixer assembly of a mixing device of the present invention.

[0022] Figure 6 It is a schematic structural diagram of a second embodiment of a mixer assembly of a mixing device of the present invention.

[0023] Figure 7 It is a schematic structural diagram of the first mixer unit of the mixing device of the present invention.

[0024] Figure 8 It is a schematic structural diagram of the second mixer unit of the mixing device of the present invention.

[0025] Fig. 9 Schematic diagram of gas flow in the first mixer unit of the mixing device of the present invention.

[0026] Fig.10 Schematic diagram of gas flow in the second mixer unit of the mixing device of the present invention.

[0027] Fig.11 It is a schematic structural diagram of the flow guide cavity assembly of the mixing device of the present invention.

[0028] Fig.12 It is a schematic diagram of the combination of the mixer assembly and the guide cavity assembly of the mixing device of the present invention.

[0029] Fig.13 Schematic diagram of the shape of the orifice plate of the mixing device of the present invention.

[0030] Reference numerals:

[0031] 1Mixer assembly

[0032] 2. Guide cavity assembly

[0033] 3 Mixer upper heat shield assembly

[0034] 4 Mixer lower heat shield assembly

[0035] 1.1 First mixer unit

[0036] 1.2 Second mixer unit

[0037] 1.3 Nozzle mounting seat

[0038] 1.4 Mixer barrel

[0039] 1.5 Mixer orifice plate

[0040] 1.1.1 Mixer upper baffle

[0041] 1.1.2 Cyclone tube

[0042] 1.1.3 Wire Mesh Assembly

[0043] 1.1.4 Mixer front baffle

[0044] 1.1.5 Mixer rear baffle

[0045] 1.1.6 Mixer lower baffle

[0046] 1.1.7 Mixer upper baffle

[0047] 1.4.1 Mixer cylinder air inlet end

[0048] 1.4.2 Mixer cylinder outlet

[0049] 2.1 Diversion cavity bottom plate

[0050] 2.2 Inner shell of flow guide cavity

[0051] 2.3 Diversion cavity insulation cotton

[0052] 2.4 Heat shield outside the flow chamber

[0053] 2.5 Sensor holder

[0054] 2.1.1 Air inlet end of the guide cavity bottom plate

[0055] 2.1.2 Air outlet end of the bottom plate of the guide cavity DETAILED DESCRIPTION

[0056] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0057] The mixing device of the present invention includes a mixer assembly 1, a guide chamber assembly 2, a mixer upper heat insulation cover assembly 3 and a mixer lower heat insulation cover assembly 4, wherein the mixer assembly 1 is installed on the guide chamber assembly 2, the mixer upper heat insulation cover assembly 3 and the mixer lower heat insulation cover assembly 4 are buckled on the outside of the mixer assembly 1, and the mixer upper heat insulation cover assembly 3 and the mixer lower heat insulation cover assembly 4 are welded to the mixer barrel 1.4 of the mixer assembly 1; the mixer assembly 1 includes a mixer assembly air inlet end 11, and the guide chamber assembly 2 includes a guide chamber assembly air outlet end 21, and the mixer assembly air inlet end 11 is inserted into the guide chamber assembly air outlet end 21 at a certain angle, and is welded around the connection.

[0058] As a preferred embodiment of the present invention, the mixer assembly 1 includes a mixer unit, a nozzle mounting seat 1.3, a mixer barrel 1.4 and a mixer orifice plate 1.5. The mixer barrel 1.4 is placed horizontally and one end is connected to the mixer unit. The nozzle mounting seat 1.3 is installed on the side wall of the mixer barrel 1.4. The mixer orifice plate 1.5 is installed at the front end of the mixer barrel 1.4. The mixer barrel 1.4 is used to weld the mixer unit, the nozzle mounting seat 1.3 and the mixer orifice plate 1.5 into a whole.

[0059] As a preferred embodiment of the present invention, the guide chamber assembly 2 includes a guide chamber bottom plate 2.1, a guide chamber inner shell 2.2, a guide chamber heat insulation cotton 2.3, a guide chamber outer heat insulation cover 2.4 and a sensor seat 2.5. The sensor seat 2.5 is welded to the guide chamber inner shell 2.2. The guide chamber inner shell 2.2 and the guide chamber outer heat insulation cover 2.4 are matched in shape and welded to form a guide chamber body. The guide chamber inner shell 2.2 and the guide chamber outer heat insulation cover 2.4 are filled with guide chamber heat insulation cotton 2.3.

[0060] As a preferred embodiment of the present invention, the guide cavity bottom plate 2.1 includes a guide cavity bottom plate air inlet end 2.1.1 and a guide cavity bottom plate air outlet end 2.1.2, the mixer cylinder 1.4 includes a mixer cylinder air inlet end 1.4.1 and a mixer cylinder air outlet end 1.4.2, the mixer cylinder air inlet end 1.4.1 is matched and connected with the guide cavity bottom plate air outlet end 2.1.2, the guide cavity bottom plate air inlet end 2.1.1 is matched and connected with the previous stage product; the mixer cylinder air outlet end 1.4.2 is matched and connected with the subsequent stage product.

[0061] As a preferred embodiment of the present invention, the air inlet end 2.1.1 of the guide cavity bottom plate and the air outlet end 2.1.2 of the guide cavity bottom plate are bell-mouth shaped, flange shaped or hump-shaped interfaces.

[0062] As a preferred embodiment of the present invention, the mixer unit comprises a first mixer unit 1.1 or a second mixer unit 1.2, wherein the first mixer unit 1.1 comprises a mixer upper baffle 1.1.1, a swirl tube 1.1.2, a steel mesh assembly 1.1.3, a mixer front baffle 1.1.4 and a mixer rear baffle 1.1.5, wherein the mixer upper baffle 1.1.1, the swirl tube 1.1.2, the steel mesh assembly 1.1.3, the mixer front baffle 1.1.4 and the mixer rear baffle 1.1.5 are welded together;

[0063] The second mixer unit 1.2 includes a mixer upper baffle 1.1.1, a swirl tube 1.1.2, a wire mesh assembly 1.1.3, a mixer lower baffle 1.1.6 and a mixer upper baffle 1.1.7, and the mixer upper baffle 1.1.1, the swirl tube 1.1.2, the wire mesh assembly 1.1.3, the mixer lower baffle 1.1.6 and the mixer upper baffle 1.1.7 are welded together; the mixer upper baffle 1.1.1 converges the airflow into the swirl tube 1.1.2.

[0064] As a preferred embodiment of the present invention, the swirl tube 1.1.2 is a conical or cylindrical mixer tube, and the periphery of the swirl tube 1.1.2 is provided with a plurality of fins inclined at a certain angle for forming a swirl.

[0065] As a preferred embodiment of the present invention, the steel wire mesh assembly 1.1.3 is a welded assembly of an internal steel wire mesh and an external circular cylinder, which is used to fully mix and pyrolyze the urea aqueous solution with the exhaust gas.

[0066] As a preferred embodiment of the present invention, the mixer front baffle 1.1.4, mixer front and rear plates 1.1.5, mixer lower baffle 1.1.6 and mixer upper baffle 1.1.7 are all plates of a certain shape, used to divide and block airflow and guide airflow at the same time.

[0067] As a preferred embodiment of the present invention, the mixer orifice plate 1.5 is a perforated plate for adjusting the uniformity of the airflow and ammonia after passing through the orifice plate.

[0068] In a specific embodiment of the present invention, a mixing device is provided, which has a simple structure, is easy to operate, and can be widely used in various catalytic muffler components. It can effectively overcome the defects of the prior art, has good emission performance, strong anti-crystallization ability, better versatility and applicability, and a compact structure.

[0069] To achieve the above object, the present invention discloses a mixing device, which can be divided into two types according to the different positions of air inlet and outlet, and is suitable for the upper air inlet and lower air outlet type, such as Figure 1 As shown, and suitable for the lower air intake and upper air outlet form, such as Figure 2 It includes a mixer assembly 1, a flow guide chamber assembly 2, a mixer upper heat shield assembly 3 and a mixer lower heat shield assembly 4, as shown in FIG. Figure 3 and Figure 4 shown.

[0070] The mixer assembly 1 (the first form or the second form), the guide chamber assembly 2, the mixer upper heat shield assembly 3 and the mixer lower heat shield assembly 4 can be combined into the mixing device of the present invention according to different design requirements.

[0071] The relative position relationship between the mixer assembly 1 and the guide cavity assembly 2 can be defined according to design requirements. The mixer upper heat insulation cover assembly 3 and the mixer lower heat insulation cover assembly 4 include an outer metal molded heat insulation cover and an inner heat insulation cotton, which will not be described in detail here.

[0072] The guide cavity assembly 2 is as follows: Fig. 9 As shown, it comprises a flow guiding cavity bottom plate 2.1, a flow guiding cavity inner shell 2.2, a flow guiding cavity heat insulation cotton 2.3, a flow guiding cavity outer heat insulation cover 2.4, and a sensor seat 2.5 welded to the flow guiding cavity inner shell 2.2. The flow guiding cavity inner shell 2.2 and the flow guiding cavity outer heat insulation cover 2.4 are matched in shape and welded to form a flow guiding cavity body, and the flow guiding cavity inner shell 2.2 and the flow guiding cavity outer heat insulation cover 2.4 are filled with the flow guiding cavity heat insulation cotton 2.3;

[0073] The air inlet end 1.4.1 of the mixer cylinder is matched and connected with the air outlet end 2.1.2 of the bottom plate of the guide cavity; the air inlet end 2.1.1 of the bottom plate of the guide cavity is matched and connected with the previous stage product; the air outlet end 1.4.2 of the mixer cylinder is matched and connected with the subsequent stage product.

[0074] The air inlet end and the air outlet end of the guide cavity bottom plate 2.1 are in the shape of a bell mouth, a flange or a hump interface.

[0075] The structure or shape of the inner shell 2.2 of the guide cavity can be made into different forms.

[0076] The first form of the mixer assembly 1 is as follows Figure 5 As shown, it comprises a first mixer unit 1.1, a nozzle mounting seat 1.3, a mixer cylinder 1.4, and a mixer orifice plate 1.5.

[0077] The second form of the mixer assembly 1 is as follows Figure 6 As shown, it comprises a second mixer unit 1.2, a nozzle mounting seat 1.3, a mixer cylinder 1.4, and a mixer orifice plate 1.5.

[0078] The nozzle mounting seat 1.3 is a flange seat matching the urea nozzle, and its specific position and shape shall be subject to actual design requirements.

[0079] The mixer barrel 1.4 is used to weld the first mixer unit 1.1 or 1.2, the nozzle mounting seat 1.3, the mixer orifice plate 1.5, etc. into a whole, and its specific position and shape shall be subject to actual design requirements.

[0080] The mixer orifice plate 1.5 is a orifice plate with a certain shape, and its function is to adjust the uniformity of the airflow and ammonia after flowing through the orifice plate. The shape and hole distribution of the orifice plate can be adjusted according to design requirements.

[0081] like Figures 1 to 11 As shown, the first mixer unit 1.1, such as Figure 7 As shown, it comprises a mixer upper baffle 1.1.1, a swirl tube 1.1.2, a steel mesh assembly 1.1.3, a mixer front baffle 1.1.4, and a mixer rear baffle 1.1.5. The mixer upper baffle 1.1.1, the swirl tube 1.1.2, the steel mesh assembly 1.1.3, the mixer front baffle 1.1.4, and the mixer rear baffle 1.1.5 are welded together to form a first mixer unit 1.1.

[0082] The second mixer unit 1.2 is as follows Figure 8 As shown, it comprises a mixer upper baffle 1.1.1, a swirl tube 1.1.2, a steel mesh assembly 1.1.3, a mixer lower baffle 1.1.6, and a mixer upper baffle 1.1.7. The mixer upper baffle 1.1.1, the swirl tube 1.1.2, the steel mesh assembly 1.1.3, the mixer lower baffle 1.1.6, and the mixer upper baffle 1.1.7 are welded together to form the second mixer unit 1.2.

[0083] The circumference of the swirl tube 1.1.2 is provided with a plurality of fins inclined at a certain angle to form a swirl, and the entire swirl tube 1.1.2 is a conical or cylindrical mixer tube. The angle, size, number and other parameters of the fins can be defined according to actual needs.

[0084] A part of the swirl tube 1.1.2 is a swirl structure with fins, and the other part is a perforated tube or a combination tube without holes to adjust the airflow accordingly.

[0085] The mixer upper baffle 1.1.1 is in a certain shape to converge the airflow into the swirl tube 1.1.2, and the specific shape can be defined according to actual needs.

[0086] The wire mesh assembly 1.1.3 is a welded assembly of an internal wire mesh and an external circular cylinder, and its function is to fully mix and pyrolyze the urea aqueous solution with the exhaust gas. The specific shape, size, thickness, specific position, etc. can be defined according to actual needs.

[0087] The mixer front baffle 1.1.4 is a plate of a certain shape, which is used to divide and block the airflow and guide the airflow. It can be perforated or not. The specific shape, size and position can be defined according to actual needs.

[0088] The front and rear plates 1.1.5 of the mixer are plates of a certain shape, which are used to divide and block the airflow and guide the airflow. They can be perforated or not. The specific shape, size and position can be defined according to actual needs.

[0089] The mixer lower baffle 1.1.6 is a plate of a certain shape, which is used to divide and block the airflow and guide the airflow. It can be perforated or not. The specific shape, size and position can be defined according to actual needs.

[0090] The mixer upper baffle 1.1.7 is a plate of a certain shape, which is used to divide and block the airflow and guide the airflow. It can be perforated or not. The specific shape, size and position can be defined according to actual needs.

[0091] The air inlet end 2.1.1 of the guide cavity bottom plate and the air outlet end 2.1.2 of the guide cavity bottom plate can be made into different connection modes or sizes according to design requirements, such as Fig.10 shown.

[0092] The air inlet end 1.4.1 of the mixer cylinder and the air outlet end 1.4.2 of the mixer cylinder can be made into different connection forms or sizes according to design requirements, such as Fig.11 shown.

[0093] The specific implementation scheme of this embodiment can refer to the relevant description in the above embodiment, which will not be repeated here.

[0094] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0095] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0097] The mixing device of the present invention has good emission performance. Since the internal mixer space is large, it is very easy to adjust the uniformity of airflow distribution and ammonia distribution. Therefore, the emission performance of the catalytic muffler component using this mixer is good. The present invention has strong anti-crystallization ability, and the uniform airflow distribution of the mixer is beneficial to the evaporation and pyrolysis of urea, which can reduce the risk of crystallization; at the same time, the thermal utilization rate of the mixer is relatively high, especially the lower baffle plate 1.1.6 of the mixer in the second mixer unit 1.2 scheme. During use, the inner and outer surfaces of the lower baffle plate 1.1.6 of the mixer are well heated by the airflow, which is very beneficial to the evaporation and pyrolysis of urea. The present invention has wide versatility and adaptability. According to different structural forms, the relative position and angle of the mixer assembly 1 and the guide cavity assembly 2 can be adjusted to form a new mixing scheme, and the components between different mixer schemes can be universalized.

[0098] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A mixing device, characterized in that: The device comprises a mixer assembly, a flow guide cavity assembly, an upper heat shield assembly of the mixer and a lower heat shield assembly of the mixer. The mixer assembly is installed on the flow guide cavity assembly, the upper heat shield assembly of the mixer and the lower heat shield assembly of the mixer are buckled on the outside of the mixer assembly, and the upper heat shield assembly of the mixer and the lower heat shield assembly of the mixer are welded and connected to the mixer barrel of the mixer assembly; the mixer assembly comprises an air inlet end of the mixer assembly, the flow guide cavity assembly comprises an air outlet end of the flow guide cavity assembly, the air inlet end of the mixer assembly is inserted into the air outlet end of the flow guide cavity assembly at a certain angle, and is welded for one circle at the connection.

2. The mixing device according to claim 1, characterized in that The mixer assembly includes a mixer unit, a nozzle mounting seat, a mixer barrel and a mixer orifice plate. The mixer barrel is placed horizontally and one end is connected to the mixer unit. The nozzle mounting seat is installed on the side wall of the mixer barrel. The mixer orifice plate is installed at the front end of the mixer barrel. The mixer barrel is used to weld the mixer unit, the nozzle mounting seat and the mixer orifice plate into a whole.

3. The mixing device according to claim 1, characterized in that The guide chamber assembly includes a guide chamber bottom plate, an inner shell of the guide chamber, guide chamber thermal insulation cotton, an outer thermal insulation cover and a sensor seat. The sensor seat is welded to the inner shell of the guide chamber. The inner shell of the guide chamber and the outer thermal insulation cover are matched in shape and welded to form the guide chamber body. The guide chamber thermal insulation cotton is filled between the inner shell of the guide chamber and the outer thermal insulation cover.

4. The mixing device according to claim 1, characterized in that The guide cavity bottom plate includes an air inlet end and an air outlet end of the guide cavity bottom plate, and the mixer cylinder includes an air inlet end and an air outlet end of the mixer cylinder. The air inlet end of the mixer cylinder is matched and connected with the air outlet end of the guide cavity bottom plate, and the air inlet end of the guide cavity bottom plate is matched and connected with the previous stage product; the air outlet end of the mixer cylinder is matched and connected with the subsequent stage product.

5. The mixing device according to claim 4, characterized in that The air inlet end of the guide cavity bottom plate and the air outlet end of the guide cavity bottom plate are trumpet-shaped, flange-shaped or hump-shaped interfaces.

6. The mixing device according to claim 1, characterized in that The mixer unit comprises a first mixer unit or a second mixer unit, wherein the first mixer unit comprises a mixer upper baffle, a swirl tube, a steel mesh assembly, a mixer front baffle and a mixer rear baffle, and the mixer upper baffle, the swirl tube, the steel mesh assembly, the mixer front baffle and the mixer rear baffle are welded together; The second mixer unit comprises a mixer upper baffle, a swirl tube, a steel mesh assembly, a mixer lower baffle and a mixer upper baffle, and the mixer upper baffle, the swirl tube, the steel mesh assembly, the mixer lower baffle and the mixer upper baffle are welded together; the mixer upper baffle converges the airflow into the swirl tube.

7. The mixing device according to claim 6, characterized in that The swirl tube is a conical or cylindrical mixer tube, and a plurality of fins inclined at a certain angle are arranged on the periphery of the swirl tube for forming a swirl.

8. The mixing device according to claim 6, characterized in that The steel wire mesh assembly is a welded assembly of an inner steel wire mesh and an outer circular cylinder, and is used to fully mix and pyrolyze the urea aqueous solution with the exhaust gas.

9. The mixing device according to claim 6, characterized in that The mixer front baffle, mixer front and rear plates, mixer lower baffle and mixer upper baffle are all plates with certain shapes, which are used to divide and block the airflow and guide the airflow to pass through.

10. The mixing device according to claim 1, characterized in that The mixer orifice plate is a perforated plate used to adjust the uniformity of the airflow and ammonia after flowing through the orifice plate.

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