Mixing device for selective catalyst fluid generator

Abstract

The invention relates to the technical field of mixing equipment, in particular to a mixing device for a fluid generator of a selective catalytic converter, comprising: a mixing cylinder having a mixing cavity, an air outlet channel formed on the right end face of the mixing cylinder, and an air inlet channel formed on the left end face of the mixing cylinder; a scraping plate is fixed on the first material pipe, and a mixing blade is mounted on the second material pipe; the purifying mechanism is used for removing impurities in the fluid, the purifying mechanism is arranged in the air outlet channel, the second material pipe rotates to drive the mixing blades which are spirally arranged to generate a strong stirring effect, the flowing path of the fluid in the mixing barrel is increased through spiral arrangement, exchange and mixing between different fluid layers are promoted, and the mixing effect of the fluid is improved. The L-shaped scraping plate can scrape the inner wall of the mixing barrel, so that the fluid is effectively prevented from depositing or scaling in the mixing process; and through the design of the purification mechanism, impurities in the fluid can be removed, and the cleanliness of the product after the reaction is improved.

Description

Technical Field

[0001] The invention relates to the technical field of mixing equipment, in particular to a mixing device for a selective catalyst fluid generator. Background Art

[0002] A selective catalytic reduction device (SCR) is a device that uses a reducing agent (such as ammonia, urea, etc.) to "selectively" react with NOx in exhaust gas under the action of a catalyst to produce nitrogen (N2) and water (H2O). This process is designed to reduce the NOx content in engine or industrial emissions to meet environmental regulations.

[0003] A common problem in the use of existing mixing devices is that due to improper temperature control or changes in other operating conditions, crystals are generated between the exhaust gas and the reducing agent solution during the reduction reaction. These crystals are deposited inside pipes, valves, pumps or other equipment, and will gradually accumulate and seriously block the fluid channel, thereby hindering the normal flow of the fluid, which not only increases the resistance to fluid transmission, but may also directly cause equipment failure, affecting the continuity and stability of the entire production process. In addition, the formation of crystals also significantly reduces the efficiency of the reduction reaction. They occupy a large amount of reaction space, reduce the effective reaction area, and reduce the contact opportunities between the reactants, thereby reducing the rate and efficiency of the reduction reaction. What is more serious is that the crystals may wrap around part of the reducing agent or catalyst to form an isolation layer, which hinders the direct contact between these key components and the reaction gas, further weakens their catalytic effect, and causes the reduction reaction effect to be greatly reduced. Therefore, it is necessary to improve and optimize it. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the problem in the prior art that crystals are deposited inside pipes, valves, pumps or other equipment, which will gradually accumulate and seriously block the fluid channel, thereby hindering the normal flow of the fluid, which not only increases the resistance to fluid transmission, but may also directly cause equipment failure and affect the continuity and stability of the entire production process. A mixing device for a selective catalyst fluid generator is provided.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a mixing device for a selective catalyst fluid generator, comprising:

[0006] A mixing cylinder having a mixing chamber, an air outlet channel formed on the right end surface of the mixing cylinder, and an air inlet channel formed on the left end surface of the mixing cylinder;

[0007] A first material pipe extends into the mixing barrel, the first material pipe and the mixing barrel are coaxially arranged, a plurality of first through holes are spaced apart along the axial direction of the first material pipe, a scraper is fixed on the first material pipe, the scraper is located in the mixing chamber of the mixing barrel, and the scraper contacts the inner wall of the mixing chamber of the mixing barrel;

[0008] A second material pipe extends into the mixing barrel and is sleeved on the first material pipe. The second material pipe has second through holes spaced apart along its axial direction. A plane on which the first through hole rotates has a second through hole corresponding to the first through hole. When the first through hole and the second through hole are connected, the tube cavity of the first material pipe is connected to the mixing cavity of the mixing barrel. A mixing blade is installed on the second material pipe.

[0009] A driving assembly, which is used to provide power for the rotation of the scraper and the mixing blade, wherein the output end of the driving assembly is drivingly connected to the first material pipe and the second material pipe, and the driving assembly can drive the first material pipe and the second material pipe to rotate at a differential speed;

[0010] and a purification mechanism, which is used to remove impurities in the fluid. The purification mechanism is arranged in the air outlet channel. The rotation of the second material pipe drives the spirally arranged mixing blades to produce a strong stirring effect. The spiral arrangement not only increases the flow path of the fluid in the mixing barrel, but also promotes the exchange and mixing between different fluid layers, thereby significantly improving the mixing efficiency. The rotation of the spiral mixing blades helps to form vortices in the mixing barrel. The vortices can further accelerate the mixing process of the fluid, so that the components in the fluid are more evenly distributed, thereby improving the uniformity and efficiency of the mixing. With the rotation of the first material pipe, the L-shaped scraper can scrape the inner wall of the mixing barrel, effectively preventing the fluid from depositing or scaling during the mixing process. This design not only reduces the cleaning workload of the mixing barrel, but also extends the service life of the mixing device. Compared with traditional fluid mixing devices, this device has significant advantages in mixing efficiency, process stability and cleaning and maintenance. Traditional devices may have problems such as uneven mixing, easy scaling, and difficult cleaning. The device effectively solves these problems through innovative structural design and functional configuration, thereby improving the overall performance and reliability of the mixing device.

[0011] Through the design of the purification mechanism, impurities in the fluid can be removed and the cleanliness of the product after the reaction can be improved.

[0012] The invention further comprises that the mixing blades are distributed in a spiral shape.

[0013] It further includes a driving assembly including a motor, a first bevel gear, a second bevel gear and a third bevel gear. The output shaft of the motor is transmission-connected to the third bevel gear. The first bevel gear is installed on the first material pipe, the second bevel gear is installed on the second material pipe, and the third bevel gear meshes with the first bevel gear and the second bevel gear.

[0014] It further includes that the transmission ratio of the first bevel gear and the third bevel gear is not equal to the transmission ratio of the second bevel gear and the third bevel gear.

[0015] The purification mechanism further includes a power fan blade, a transmission assembly and a filter plate. The power fan blade is rotatably connected to the air outlet channel, the filter plate is rotatably connected to the air outlet channel, the filter plate and the air outlet channel are coaxially arranged, the power fan blade is rotatably connected to the input end of the transmission assembly, the output end of the transmission assembly is rotatably connected to the filter plate, and the power fan blade is used to receive wind force to drive the filter plate to rotate along its circumferential direction.

[0016] The purification mechanism further comprises a scraper strip, the scraper strip is fixedly connected to the air outlet channel, and the scraper strip is attached to the end surface of the filter plate close to the input end of the air outlet channel.

[0017] The purification mechanism further includes a fixed block, the fixed block is located in the air outlet channel, and the fixed block and the air outlet channel are fixedly connected, the filter plate is fixedly connected to the fixed block, and the filter plate is located between the fixed block and the scraper strip.

[0018] The transmission assembly further includes a first rotating shaft, a second rotating shaft, a fourth bevel gear, a fifth bevel gear, a mounting seat, a transmission belt and a transmission gear. The first rotating shaft is rotatably connected to the air outlet channel, the power fan blades are fixedly connected to the first rotating shaft, one end of the first rotating shaft extends to the outside of the air outlet channel and is provided with a fourth bevel gear thereon, the fourth bevel gear and the fifth bevel gear are meshed, the second rotating shaft is rotatably connected to the mounting seat, the fifth bevel gear is arranged on the second rotating shaft, the outer periphery of the filter plate has teeth, the transmission gear is meshed with the teeth on the filter plate, the transmission gear is rotatably connected to the mounting seat through the rotating shaft, and the transmission belt is wound around the rotating shaft of the second rotating shaft and the transmission gear.

[0019] The purification mechanism further includes a collection box for accommodating impurities filtered by the filter plate, the collection box is fixedly connected to the air outlet channel, the box opening of the collection box is located between the filter plate and the power fan blades, and the box opening of the collection box is connected to the air outlet channel.

[0020] The invention further comprises a temperature controller installed on the air inlet channel.

[0021] The mixing cylinder is further provided with a collecting channel, and a plug is arranged in the collecting channel.

[0022] The beneficial effects of the present invention are as follows: the mixing device for a selective catalyst fluid generator provided by the present invention drives the spirally arranged mixing blades to produce a strong stirring effect through the rotation of the second material pipe. The spiral arrangement not only increases the flow path of the fluid in the mixing barrel, but also promotes the exchange and mixing between different fluid layers, thereby significantly improving the mixing efficiency. The rotation of the spiral mixing blades helps to form a vortex in the mixing barrel. The vortex can further accelerate the mixing process of the fluid, so that the various components in the fluid are more evenly distributed, thereby improving the uniformity and efficiency of the mixing. With the rotation of the first material pipe;

[0023] The L-shaped scraper can scrape the inner wall of the mixing barrel, effectively preventing the fluid from depositing or scaling during the mixing process. This design not only reduces the cleaning workload of the mixing barrel, but also extends the service life of the mixing device. Compared with traditional fluid mixing devices, this device has significant advantages in mixing efficiency, process stability and cleaning and maintenance. Traditional devices may have problems such as uneven mixing, easy scaling, and difficult cleaning. This device effectively solves these problems through innovative structural design and functional configuration, and improves the overall performance and reliability of the mixing device.

[0024] Through the design of the purification mechanism, impurities in the fluid can be removed and the cleanliness of the product after the reaction can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 It is a cross-sectional structural schematic diagram of the present invention;

[0028] Figure 3 It is a schematic diagram of the cross-sectional structure of the air outlet channel of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the purification mechanism of the present invention;

[0030] Figure 5 It is a schematic diagram of the local structure of the air inlet channel of the present invention;

[0031] Figure 6 It is a schematic diagram of the explosion structure at the first material pipe and the second material pipe of the present invention;

[0032] Figure 7 The present invention Figure 6 Schematic diagram of the enlarged structure at point A in the middle.

[0033] In the figure: 1, mixing cylinder, 11, mixing chamber, 12, air outlet channel, 13, air inlet channel, 131, temperature controller, 14, collecting channel, 15, plug;

[0034] 2. first material pipe, 21. first through hole, 22. scraper;

[0035] 3. second material pipe, 31. second through hole, 32. mixing blade;

[0036] 4. driving assembly, 41. motor, 42. first bevel gear, 43. second bevel gear, 44. third bevel gear;

[0037] 5. Purification mechanism, 51. Power fan blades, 52. Transmission assembly, 521. First rotating shaft, 522. Second rotating shaft, 523. Fourth bevel gear, 524. Fifth bevel gear, 525. Mounting seat, 526. Transmission belt, 527. Transmission gear, 53. Filter plate, 54. Scraper strip, 55. Fixed block, 56. Collection box. DETAILED DESCRIPTION

[0038] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0039] like Figure 1 The present invention is a structural schematic diagram of a mixing device for a selective catalyst fluid generator, comprising:

[0040] The mixing barrel 1 has a mixing chamber 11, an air outlet channel 12 is formed on the right end surface of the mixing barrel 1, an air inlet channel 13 is formed on the left end surface of the mixing barrel 1, and a temperature controller 131 is installed on the air inlet channel 13. The air inlet channel 13 is connected with the interior of the mixing barrel 1, ensuring that the external gas can smoothly enter the interior of the mixing barrel to provide the necessary reactants or carrier gas for the catalytic reaction. The temperature controller 131 is fixedly sleeved on the outer wall of the air inlet channel 13. The function of the temperature controller 131 is to control the temperature of the gas entering the mixing barrel, ensuring that the gas is within the optimal reaction temperature range when reaching the catalytic reaction area. By accurately controlling the intake temperature, the conditions of the catalytic reaction can be optimized, and the reaction efficiency and product quality can be improved. A flange ring is provided at one end of the air inlet channel 13 close to the temperature controller 131, which can achieve a close connection between the air inlet channel 13 and other pipelines or equipment and ensure the sealing of the connection;

[0041] The mixing cylinder 1 is provided with a collecting channel 14, in which a plug 15 is arranged. The channel plug 15 allows the user to control the retention or removal of crystals at any time as required.

[0042] The first material pipe 2 extends into the mixing barrel 1. The first material pipe 2 and the mixing barrel 1 are coaxially arranged. The first material pipe 2 is provided with a plurality of first through holes 21 spaced apart along its axial direction. A scraper 22 is fixed to the first material pipe 2. The scraper 22 is located in the mixing chamber 11 of the mixing barrel 1. The scraper 22 is L-shaped, and the scraper 22 contacts the inner wall of the mixing chamber 11 of the mixing barrel 1. The L-shaped scraper 22 can scrape the inner wall of the mixing barrel, effectively preventing the fluid from depositing or scaling during the mixing process. This design not only reduces the cleaning workload of the mixing barrel, but also extends the service life of the mixing device. Compared with the traditional fluid mixing device, the device has significant advantages in mixing efficiency, process stability and cleaning and maintenance. The traditional device may have problems such as uneven mixing, easy scaling and difficult cleaning. The device effectively solves these problems through innovative structural design and functional configuration, thereby improving the overall performance and reliability of the mixing device.

[0043] The second material pipe 3 extends into the mixing barrel 1, and the second material pipe 3 is sleeved on the first material pipe 2. The second material pipe 3 has second through holes 31 spaced apart along its axial direction. The plane where the first through hole 21 rotates has a second through hole 31 corresponding to it. When the first through hole 21 and the second through hole 31 are connected, the tube cavity of the first material pipe 2 is connected with the mixing cavity 11 of the mixing barrel 1. The second material pipe 3 is equipped with mixing blades 32, which are distributed in a spiral shape. The rotation of the second material pipe 3 drives the spirally arranged mixing blades 32 to produce a strong stirring effect. The spiral arrangement not only increases the flow path of the fluid in the mixing barrel, but also promotes the exchange and mixing between different fluid layers, thereby significantly improving the mixing efficiency. The rotation of the spiral mixing blades 32 helps to form a vortex in the mixing barrel. The vortex can further accelerate the mixing process of the fluid, so that the components in the fluid are more evenly distributed, thereby improving the uniformity and efficiency of the mixing. With the rotation of the first material pipe;

[0044] When the first through hole 21 and the second through hole 31 do not overlap, the pressure in the first material pipe 2 increases. After the first through hole 21 and the second through hole 31 overlap, the gas is ejected from the first through hole 21 and the second through hole 31, increasing the ejection speed, thereby improving the diffusion of the reaction gas in the mixing barrel 1, making the distribution of the fluid in the mixing barrel more extensive and uniform, which helps to accelerate the mixing process of the fluid, improve the mixing efficiency, and thus shorten the time of the catalytic reaction.

[0045] The size of the first through hole 21 is equal to the size of the second through hole 31 .

[0046] The driving assembly 4 is used to provide power for the rotation of the scraper 22 and the mixing blade 32. The output end of the driving assembly 4 is connected to the first material pipe 2 and the second material pipe 3. The driving assembly 4 can drive the first material pipe 2 and the second material pipe 3 to rotate differentially, so that the first through hole 21 and the second through hole 31 can overlap in time and space; the driving assembly 4 includes a motor 41, a first bevel gear 42, a second bevel gear 43 and a third bevel gear 44. The output shaft of the motor 41 is connected to the third bevel gear 44 in a transmission connection. The first bevel gear 42 is installed on the first material pipe 2, the second bevel gear 43 is installed on the second material pipe 3, and the third bevel gear 44 meshes with the first bevel gear 42 and the second bevel gear 43.

[0047] The motor 41 is used as a power source, and the third bevel gear 44 on its output shaft transmits power to the first bevel gear 42 and the second bevel gear 43 respectively through a precise meshing relationship, thereby ensuring the high efficiency of power transmission and reducing energy loss, so that the first material pipe 2 and the second material pipe 3 can rotate at a higher speed and stable power, thereby improving the mixing efficiency.

[0048] The transmission ratio of the first bevel gear 42 and the third bevel gear 44 is different from the transmission ratio of the second bevel gear 43 and the third bevel gear 44. In the embodiment, the transmission ratio of the first bevel gear 42 and the third bevel gear 44 is 1, and the transmission ratio of the second bevel gear 43 and the third bevel gear 44 is 1.5.

[0049] And a purification mechanism 5 is used to remove impurities in the fluid, and the purification mechanism 5 is arranged in the air outlet channel 12.

[0050] The purification mechanism 5 includes a power fan blade 51, a transmission assembly 52 and a filter plate 53. The power fan blade 51 is rotatably connected to the air outlet channel 12, the filter plate 53 is rotatably connected to the air outlet channel 12, the filter plate 53 and the air outlet channel 12 are coaxially arranged, the power fan blade 51 is transmission-connected to the input end of the transmission assembly 52, the output end of the transmission assembly 52 is transmission-connected to the filter plate 53, the power fan blade 51 is used to receive the wind force to drive the filter plate 53 to rotate along its circumferential direction, and the power fan blade 51 has three spaced-apart fan bodies.

[0051] When the gas after the selective catalytic mixing reaction is discharged through the air outlet channel 12, this high-speed flowing gas will produce a certain impact force on the power fan blades 51, thereby driving the power fan blades 51 to rotate, realizing energy recovery and utilization, and providing additional power support for the entire system.

[0052] The purification mechanism 5 includes a scraper bar 54 , which is fixedly connected to the air outlet channel 12 and fits against an end surface of the filter plate 53 close to the input end of the air outlet channel 12 . The scraper bar 54 is used to scrape off impurities filtered by the filter plate 53 .

[0053] The purification mechanism 5 includes a fixed block 55, which is located in the air outlet channel 12, and the fixed block 55 and the air outlet channel 12 are fixedly connected, the filter plate 53 and the fixed block 55 are fixedly connected, and the filter plate 53 is located between the fixed block 55 and the scraper 54. When the fluid passes through the filter plate 53, the filtering effect is enhanced through the rotation action to prevent blockage and extend the service life of the filter plate 53. In order to further improve the filtering effect, the scraper 54 is tightly fitted with the outer surface of the filter plate 53. During the rotation of the filter plate 53, the scraper 54 can scrape off impurities and particulate matter attached to the surface of the filter plate 53, thereby keeping the filter plate 53 clean and unobstructed.

[0054] The transmission assembly 52 includes a first rotating shaft 521, a second rotating shaft 522, a fourth bevel gear 523, a fifth bevel gear 524, a mounting seat 525, a transmission belt 526 and a transmission gear 527. The first rotating shaft 521 is rotatably connected to the air outlet channel 12, the power fan blade 51 is fixedly connected to the first rotating shaft 521, one end of the first rotating shaft 521 extends to the outside of the air outlet channel 12 and is arranged with a fourth bevel gear 523 thereon, the fourth bevel gear 523 is meshed with the fifth bevel gear 524, the second rotating shaft 522 is rotatably connected to the mounting seat 525, and the fifth bevel gear 524 is arranged on the second rotating shaft 522. The filter plate 53 has teeth on its outer periphery, and the transmission gear 527 meshes with the teeth on the filter plate 53. The transmission gear 527 is rotatably connected to the mounting seat 525 through a rotating shaft. The transmission belt 526 rotates around the second rotating shaft and the transmission gear 527. The air outlet channel 12 has a notch for the transmission gear 527 to pass through, and the notch matches the transmission gear 527. When the transmission gear 527 rotates, the transmission gear 527 and the notch of the air outlet channel 12 form a dynamic sealing state, and there is basically no leakage of the reaction fluid. Further, the notch can be covered by the mounting seat 525 to prevent it from communicating with the outside.

[0055] The purification mechanism 5 includes a collection box 56 for accommodating impurities filtered by the filter plate 53. The collection box 56 is fixedly connected to the air outlet channel 12. The box opening of the collection box 56 is located between the filter plate 53 and the power fan blades 51, and the box opening of the collection box 56 is connected to the air outlet channel 12. Furthermore, the box opening of the collection box 56 is located below the scraper strip 54.

[0056] Working principle: the gas to be treated enters the mixing barrel 1 through the air inlet channel 13, and then the pipeline of the reducing agent urea aqueous solution is rotatably installed with one end of the first material pipe 2. The temperature controller 131 on the air inlet channel 13 controls the temperature of the incoming gas to ensure that the gas is at the optimal reaction temperature when it reaches the catalytic reaction area. Then the motor 41 is started, and its output shaft drives the third bevel gear 44 to rotate. The third bevel gear 44 is meshed with the first bevel gear 42 and the second bevel gear 43 to drive the first material pipe 2 and the second material pipe 3 to rotate respectively. The L-shaped scraper 22 on the first material pipe 2 rotates with it to scrape the inner wall of the mixing barrel 1 to prevent crystal deposition or scaling. The spiral mixing blade 32 on the second material pipe 3 rotates with it to produce a strong stirring effect and vortex to promote uniform mixing of the fluid. The first through hole 21 and the second through hole 22 on the first material pipe 2 and the second material pipe 3 The through hole 31 sprays the reducing agent urea aqueous solution to produce an oxidation-reduction reaction. The gas after the reaction enters the air outlet channel 12 through the mixing barrel 1. The gas is first filtered through the filter plate 53 in the air outlet channel 12 to further remove impurities and particulate matter. The high-speed flowing gas drives the power fan blade 51 to rotate. The exhaust fan 18 provides rotational power to the filter plate 25 through the transmission assembly 52. ​​The scraper bar 54 rotates with the filter plate 53 to scrape off impurities on the surface of the filter plate 53 to maintain the filtering effect, further enhance the filtering effect, and prevent dust on the filter plate 53 from adhering to its surface, thereby affecting the filtering effect. The crystals produced by the catalytic reaction pass through the collection channel 14 at the bottom of the mixing barrel 1. The channel plug 15 at the bottom of the collection channel 14 can control the discharge of the crystals as needed. The filtered gas is discharged from the top of the air outlet channel 12 to complete the entire workflow.

[0057] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A mixing device for a selective catalyst fluid generator, characterized in that: include: A mixing cylinder (1) having a mixing chamber (11), an air outlet channel (12) being formed on the right end surface of the mixing cylinder (1), and an air inlet channel (13) being formed on the left end surface of the mixing cylinder (1); A first material pipe (2) extends into the mixing barrel (1), the first material pipe (2) and the mixing barrel (1) are coaxially arranged, a plurality of first through holes (21) are spaced apart along the axial direction of the first material pipe (2), a scraper (22) is fixed to the first material pipe (2), the scraper (22) is located in the mixing chamber (11) of the mixing barrel (1), and the scraper (22) is in contact with the inner wall of the mixing chamber (11) of the mixing barrel (1); a second material pipe (3) extending into the mixing barrel (1), and the second material pipe (3) being sleeved on the first material pipe (2), the second material pipe (3) having second through holes (31) spaced apart along its axial direction, the plane on which the first through hole (21) rotates having a second through hole (31) corresponding thereto, when the first through hole (21) and the second through hole (31) are in communication, the tube cavity of the first material pipe (2) and the mixing cavity (11) of the mixing barrel (1) are in communication, and the second material pipe (3) is provided with a mixing blade (32); A driving assembly (4) for providing power for the rotation of the scraper (22) and the mixing blade (32), wherein the output end of the driving assembly (4) is drivingly connected to the first material pipe (2) and the second material pipe (3), and the driving assembly (4) can drive the first material pipe (2) and the second material pipe (3) to rotate at a differential speed; And a purification mechanism (5) for removing impurities in the fluid, wherein the purification mechanism (5) is arranged in the air outlet channel (12).

2. A mixing device for a selective catalyst fluid generator as claimed in claim 1, characterized in that: The mixing blades (32) are distributed in a spiral shape.

3. A mixing device for a selective catalyst fluid generator as claimed in claim 1, characterized in that: The driving assembly (4) comprises a motor (41), a first bevel gear (42), a second bevel gear (43) and a third bevel gear (44); the output shaft of the motor (41) is drivingly connected to the third bevel gear (44); the first bevel gear (42) is mounted on the first material pipe (2); the second bevel gear (43) is mounted on the second material pipe (3); and the third bevel gear (44) meshes with the first bevel gear (42) and the second bevel gear (43); The transmission ratio between the first bevel gear (42) and the third bevel gear (44) is not equal to the transmission ratio between the second bevel gear (43) and the third bevel gear (44).

4. A mixing device for a selective catalyst fluid generator as claimed in claim 1, characterized in that: The purification mechanism (5) comprises a power fan blade (51), a transmission assembly (52) and a filter plate (53); the power fan blade (51) is rotatably connected to the air outlet channel (12); the filter plate (53) is rotatably connected to the air outlet channel (12); the filter plate (53) and the air outlet channel (12) are coaxially arranged; the power fan blade (51) is rotatably connected to the input end of the transmission assembly (52); the output end of the transmission assembly (52) is rotatably connected to the filter plate (53); the power fan blade (51) is used to receive wind force to drive the filter plate (53) to rotate along its circumferential direction.

5. A mixing device for a selective catalyst fluid generator as claimed in claim 4, characterized in that: The purification mechanism (5) comprises a scraper (54), the scraper (54) being fixedly connected to the air outlet channel (12), and the scraper (54) being in contact with an end surface of the filter plate (53) close to the input end of the air outlet channel (12).

6. A mixing device for a selective catalyst fluid generator as claimed in claim 5, characterized in that: The purification mechanism (5) comprises a fixed block (55), the fixed block (55) is located in the air outlet channel (12), and the fixed block (55) and the air outlet channel (12) are fixedly connected, the filter plate (53) and the fixed block (55) are fixedly connected, and the filter plate (53) is located between the fixed block (55) and the scraper (54).

7. A mixing device for a selective catalyst fluid generator as claimed in claim 4, characterized in that: The transmission assembly (52) comprises a first rotating shaft (521), a second rotating shaft (522), a fourth bevel gear (523), a fifth bevel gear (524), a mounting seat (525), a transmission belt (526) and a transmission gear (527); the first rotating shaft (521) is rotatably connected to the air outlet channel (12); the power fan blade (51) is fixedly connected to the first rotating shaft (521); one end of the first rotating shaft (521) extends to the outside of the air outlet channel (12) and a fourth bevel gear (523) is arranged thereon; The fourth bevel gear (523) is meshed with the fifth bevel gear (524), the second rotating shaft (522) is rotationally connected to the mounting seat (525), the fifth bevel gear (524) is arranged on the second rotating shaft (522), the outer periphery of the filter plate (53) has teeth, the transmission gear (527) is meshed with the teeth on the filter plate (53), the transmission gear (527) is rotationally connected to the mounting seat (525) via the rotating shaft, and the transmission belt (526) is wound around the rotating shaft of the second rotating and transmission gear (527).

8. A mixing device for a selective catalyst fluid generator as claimed in claim 4, characterized in that: The purification mechanism (5) comprises a collection box (56) for accommodating impurities filtered by the filter plate (53); the collection box (56) is fixedly connected to the air outlet channel (12); the box opening of the collection box (56) is located between the filter plate (53) and the power fan blade (51); and the box opening of the collection box (56) is connected to the air outlet channel (12).

9. A mixing device for a selective catalyst fluid generator as claimed in claim 1, characterized in that: A temperature controller (131) is installed on the air inlet channel (13).

10. A mixing device for a selective catalyst fluid generator as claimed in claim 1, characterized in that: The mixing cylinder (1) is provided with a collecting channel (14), and a plug (15) is arranged in the collecting channel.

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