A high-efficiency impeller type powder classifying device suitable for high Reynolds number working conditions

Abstract

The application discloses a high-efficiency impeller type powder classifying device suitable for high Reynolds number working conditions, which comprises an air inlet pipeline, a pre-flow dividing mechanism and a centrifugal classifying mechanism, the pre-flow dividing mechanism comprises a pre-flow dividing shell, a flow guide cylinder, an elastic sleeve, a self-rotating impeller, an air injection assembly and an adjusting controller, the pre-flow dividing shell comprises a lower cylinder body and an upper cylinder body, the adjusting controller is in communication connection with a flow sensor and the air injection assembly, and is used for adjusting the pressure in an air injection cavity according to the flow in the air inlet pipeline. The initial centrifugal force generated by the rotation of the self-rotating impeller is used to make the coarse particles diffuse and settle to the edge of the pipeline in advance, so that the coarse particle load entering the centrifugal classifying mechanism is reduced, and the coarse particles are prevented from escaping to the central area due to fluid disturbance under the high Reynolds number working condition. Meanwhile, through dynamic matching of the flow sensor and the air injection assembly, the inner diameter of the elastic sleeve is adaptively adjusted according to the actual flow, so that the stability of the classifying effect can be ensured.

Description

Technical Field

[0001] This application relates to the field of powder classification technology, specifically to a high-efficiency impeller-type powder classification device suitable for high Reynolds coefficient conditions. Background Technology

[0002] In the preparation of heavy calcium carbonate powder, the downstream classification process is a crucial step, playing a decisive role in powder quality. With continuous industrial development and increasingly stringent requirements for powder quality, the importance of the classification process is becoming ever more prominent. A high-quality classification process can effectively improve powder purity and particle size uniformity, meeting the stringent quality demands of various industries. It is widely used in plastics, rubber, coatings, and many other fields, promoting the high-quality development of related industries.

[0003] Currently, in the classification of atomized powder mixtures, the process typically begins with pipeline transport. Leveraging factors such as upward wind force, gravity, and the damped velocity gradient at the pipeline edge, initial separation of light and heavy particles is achieved, allowing lighter particles to accumulate in the center and heavier particles to gather at the pipeline edge. Subsequently, the mixture enters an impeller-type classifier. Utilizing the horizontal centrifugal force generated by the high-speed rotation of the vertically placed impeller, coarse particles are thrown outwards and fall back into the lower pipeline, while fine particles are smoothly discharged, thus achieving particle size classification.

[0004] However, existing impeller-type classifiers have significant shortcomings. They use a single channel for both air intake and dust discharge, making the powder classification quality overly dependent on airflow and classifier speed, failing to fully utilize the velocity gradient effect of the pipeline. Under high-volume production demands, the air pressure and flow velocity within the pipeline increase, placing the fluid under high Reynolds coefficient conditions. The marginal resistance provided by the smooth pipeline is minimal, resulting in weak velocity gradient differences between powder particles. This leads to larger, coarse particles appearing in the central region, or even escaping due to increased lift or velocity, causing an increase in the proportion of coarse powder in the classified powder and the appearance of large particle tailing. Furthermore, the coarse powder ejected by centrifugal force falls back into the pipeline and mixes with the dust mist below, colliding again under the upward airflow, resulting in low overall classification efficiency and an excessively high coarse powder content in the classified powder. In addition, traditional powder classifiers cannot dynamically adjust classification parameters according to different dust and gas flow rates, leading to unstable classification results. Summary of the Invention

[0005] To address the technical problems in the prior art, this application provides a high-efficiency impeller-type powder classifier suitable for high Reynolds coefficient operating conditions.

[0006] The high-efficiency impeller-type powder classifier suitable for high Reynolds coefficient conditions provided in this application adopts the following technical solution: A high-efficiency impeller-type powder classifier suitable for high Reynolds coefficient conditions includes: The air intake pipe is equipped with a flow sensor; A pre-diversion mechanism includes a pre-diversion shell, a guide tube, an elastic sleeve, a rotating impeller, an air injection assembly, and a regulating controller. The pre-diversion shell includes a lower cylinder and an upper cylinder. The guide tube is built into the lower cylinder and its lower end is connected to the air inlet pipe. A settling channel is formed between the outer wall of the guide tube and the lower cylinder. The elastic sleeve is fixed in the upper cylinder, and a sealed air injection chamber is formed between the elastic sleeve and the upper cylinder. The rotating impeller is rotatably disposed in the elastic sleeve and located above the guide tube. The air injection assembly is used to supply or evacuate air into the air injection chamber. The regulating controller is communicatively connected to the flow sensor and the air injection assembly and is used to adjust the pressure in the air injection chamber according to the flow rate in the air inlet pipe. The centrifugal grading mechanism has its inlet connected to the upper end of the upper cylinder.

[0007] Preferably, the guide tube is a conical guide tube, the small-diameter end of the conical guide tube is connected to the air inlet pipe, the spinning impeller is located above the large-diameter end of the conical guide tube, and the lower cylinder is a lower conical sleeve.

[0008] Preferably, the pre-diversion mechanism further includes a coarse powder collection hopper, the upper end of which is connected to the lower end of the lower cylinder.

[0009] Preferably, an air injection port communicating with the air injection chamber is provided on the outer side wall of the upper cylinder, and the air injection assembly includes an air pump and an air injection pipe, wherein the air pump is connected to the air injection port via the air injection pipe.

[0010] Preferably, an air injection valve is provided on the air injection port.

[0011] Preferably, the pre-diverting mechanism further includes a turbulence cone, which is coaxially fixed to the spinning impeller, and the tip of the turbulence cone is positioned towards the air intake pipe.

[0012] Preferably, the pre-diversion mechanism further includes a grid plate, which is fixed to the upper opening of the upper cylinder.

[0013] Preferably, the pre-diversion mechanism further includes a fixed column located inside the upper cylinder, the fixed column being fixed to the grid plate, and the rotating impeller being rotatably mounted on the fixed column.

[0014] Preferably, the centrifugal grading mechanism includes a centrifugal cylinder, an exhaust pipe, a centrifugal impeller, and a drive assembly. The lower end of the centrifugal cylinder is coaxially fixed to the upper end of the upper cylinder. The upper end of the centrifugal cylinder is connected to one end of the exhaust pipe. The centrifugal impeller is rotatably disposed inside the centrifugal cylinder and is coaxially disposed with the centrifugal cylinder. The drive assembly is connected to the centrifugal impeller and is used to drive the centrifugal impeller to rotate.

[0015] Preferably, the drive assembly includes a fixed base, a drive shaft, and a drive motor. The fixed base is fixed to the exhaust pipe, the drive shaft is rotatably mounted on the fixed base, the drive shaft is coaxially and fixedly connected to the centrifugal impeller, and the drive motor is connected to the drive shaft and is used to drive the drive shaft to rotate.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. In the pre-diversion stage, the initial centrifugal force generated by the rotation of the self-rotating impeller is used to make coarse particles diffuse towards the edge of the pipe and settle in advance, reducing the load of coarse particles entering the centrifugal classification mechanism and preventing coarse particles from escaping to the central area due to fluid disturbance under high Reynolds coefficient conditions, thereby reducing the proportion of coarse powder in the classified powder and the tailing phenomenon of large particles. 2. Traditional processes rely on controlling the airflow and rotation speed of a single channel to regulate grading quality. High-volume production requires significantly increased air pressure and rotation speed, leading to a surge in energy consumption. This solution utilizes dynamic matching between a flow sensor and the air injection component to adaptively adjust the inner diameter of the elastic sleeve based on the actual flow rate, thereby ensuring the stability of the grading effect. 3. The independent settling channel formed between the outer wall of the guide tube and the lower tube is completely separated from the air intake channel inside the guide tube, so that the upward airflow of dust-containing gas is completely separated from the settling path of coarse particles. This avoids the problem of coarse powder directly colliding with the rising airflow and mixing with powder mist when falling back in the traditional process, ensuring that the air intake and powder discharge processes do not interfere with each other, and further improving the classification efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a high-efficiency impeller-type powder classifier suitable for high Reynolds coefficient operating conditions provided in one embodiment of this application; Figure 2 yes Figure 1 A schematic diagram of the pre-diversion mechanism in the middle; Figure 3 yes Figure 2 A schematic diagram of the pre-diversion mechanism in the injection chamber when it is fully inflated. Figure 4 yes Figure 2 A schematic diagram of the pre-diversion mechanism in the air injection chamber when it is in an unfilled state; Figure 5 yes Figure 2 A three-dimensional structural diagram of the spinning impeller and turbulence cone in the image; Figure 6 yes Figure 1 A schematic diagram of the centrifugal grading mechanism in the diagram; Explanation of reference numerals in the attached drawings: 1. Inlet pipe; 11. Flow sensor; 2. Pre-diversion mechanism; 21. Pre-diversion housing; 211. Lower cylinder; 212. Upper cylinder; 213. Settling channel; 22. Guide tube; 23. Elastic sleeve; 231. Injection chamber; 232. Injection port; 233. Injection valve; 24. Spinning impeller; 25. Injection assembly; 251. Air pump; 252. Injection pipe; 26. Coarse powder collection hopper; 27. Turbulence cone; 28. Grid plate; 29. ​​Fixed column; 3. Centrifugal classification mechanism; 31. Centrifugal cylinder; 32. Exhaust pipe; 33. Centrifugal impeller; 34. Drive assembly; 341. Fixed base; 342. Drive shaft; 343. Drive motor. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The described embodiments are only possible technical implementations of the present invention, but are not limited thereto. Other embodiments obtained by those skilled in the art in conjunction with the embodiments of the present invention without creative effort are also within the protection scope of the present invention.

[0019] This application mainly adopts an optimized air inlet pipe 1 structure combined with dynamic adjustment to achieve efficient powder classification. It improves the quality and efficiency of powder classification and reduces the energy consumption of the classifier under high Reynolds coefficient conditions and unstable flow scenarios. The following is a further detailed description of this application.

[0020] Please refer to Figures 1-6 The high-efficiency impeller-type powder classifier provided in this application embodiment, suitable for high Reynolds coefficient conditions, includes an air inlet pipe 1, a pre-diversion mechanism 2, and a centrifugal classification mechanism 3. The air inlet pipe 1 is connected to the pre-diversion mechanism 2, which is in turn connected to the inlet of the centrifugal classification mechanism 3. This connection method allows the dust-containing gas to pass through the two stages of pre-diversion and centrifugal classification in sequence, achieving the effect of first initially separating large-diameter particles and then performing fine classification, reducing the pressure on the centrifugal classification mechanism 3, and improving the classification efficiency.

[0021] For details, please refer to Figure 1A flow sensor 11 is installed on the intake pipe 1. The flow sensor 11 is used to monitor the flow rate of dust-containing gas in the intake pipe 1 in real time, so that the device can be adjusted accordingly based on the flow rate. The flow sensor 11 can be an ultrasonic flow sensor, which uses the time difference between upstream and downstream propagation of ultrasonic waves in a fluid to measure the flow rate, and has the advantages of high measurement accuracy and being unaffected by the physical properties of the fluid; or it can be an electromagnetic flow sensor, which determines the flow rate by detecting the induced electromotive force generated by the fluid flowing in a magnetic field, and is suitable for fluids with good conductivity. The flow sensor 11 is fixed on the intake pipe 1 by a suitable installation method to ensure that it can accurately measure the flow rate data.

[0022] Please refer to Figures 1-5 The pre-diversion mechanism 2 includes a pre-diversion shell 21, a guide tube 22, an elastic sleeve 23, a spinning impeller 24, an air injection assembly 25, and an adjustment controller. The pre-diversion shell 21 includes a lower cylinder 211 and an upper cylinder 212. The guide tube 22 is housed within the lower cylinder 211, and its lower end connects to the air inlet pipe 1. A settling channel 213 is formed between the outer wall of the guide tube 22 and the lower cylinder 211. The guide tube 22 guides the flow of dust-laden gas, allowing it to flow upwards in an orderly manner. The settling channel 213 provides space for large-diameter particles to settle; during the pre-diversion process, large-diameter particles can fall through this channel. The guide tube 22 can be made of metal, such as stainless steel, which has good corrosion resistance and strength; or it can be made of plastic, such as polypropylene, which is lightweight and low-cost. The lower cylinder 211 can also be made of a suitable material according to actual needs, and its shape can be cylindrical or conical.

[0023] Please refer to Figures 1-4 The elastic sleeve 23 is fixed inside the upper cylinder 212, forming a sealed air injection chamber 231 between the elastic sleeve 23 and the upper cylinder 212. The elastic sleeve 23 is elastic, and its inner diameter can change when the pressure in the air injection chamber 231 changes (e.g., ...). Figures 2-4 The elastic sleeve 23 can be made of rubber, which has good elasticity and sealing performance; or it can be made of silicone, which is heat-resistant and flexible. The presence of the air injection chamber 231 allows the inner diameter of the elastic sleeve 23 to be controlled by adjusting the pressure inside the air injection chamber 231.

[0024] Please refer to Figures 1-4The spinning impeller 24 is rotatably mounted inside the elastic sleeve 23 and positioned above the guide tube 22. Under the influence of the flow of dust-laden gas, the spinning impeller 24 automatically rotates, generating a certain centrifugal force, which helps in the initial separation of particles in the gas. The spinning impeller 24 can be made of lightweight alloy material, such as aluminum alloy, to reduce its weight and facilitate rotation; it can also be made of engineering plastic material, which has good wear resistance. The blade shape of the spinning impeller 24 can be helical or inclined to better utilize the energy of the gas flow to achieve rotation.

[0025] Please refer to Figures 1-4 The guide tube 22 is a conical guide tube, with its small-diameter end connected to the air inlet pipe 1. The spinning impeller 24 is located above the large-diameter end of the conical guide tube, and the lower cylinder is also a lower conical sleeve. The design of the conical guide tube allows the gas velocity to gradually decrease during the upward movement.

[0026] Please refer to Figures 1-4 The air injection assembly 25 is used to supply or extract air into the air injection chamber 231. The regulating controller is communicatively connected to both the flow sensor 11 and the air injection assembly 25, and is used to adjust the pressure in the air injection chamber 231 according to the flow rate in the air inlet pipe 1. When the flow rate in the air inlet pipe 1 is greater, the pressure in the air injection chamber 231 is lower, and the inner diameter of the elastic sleeve 23 is larger. When the dust-laden gas enters the elastic sleeve 23 from the side of the spinning impeller 24, the flow velocity is reduced due to volume expansion, thereby causing large-diameter particles in the dust-laden gas to fall from the settling channel 213, achieving pre-diversion. The gas injection assembly 25 may include an air pump 251 and an air injection pipe 252. The air pump 251 is connected to an air injection port 232 located on the outer wall of the upper cylinder 212 and connected to the air injection chamber 231 via the air injection pipe 252. In this embodiment, the air pump 251 is a bidirectional air pump. This type of air pump achieves airflow direction switching through structural design to meet the inflation or deflation needs in different scenarios. An air injection valve 233 is also provided on the air injection port 232 to control the inlet and outlet of gas. The air injection valve 233 may be an electric valve, which facilitates precise control by the regulating controller. The regulating controller may be a microcontroller or a programmable logic controller (PLC), which has powerful computing and control capabilities and can accurately adjust the operation of the gas injection assembly 25 based on the data transmitted from the flow sensor 11.

[0027] Please refer to Figures 1-4 The pre-diversion mechanism 2 may also include a coarse powder collection hopper 26, the upper end of which is connected to the lower end of the lower cylinder 211, for collecting large-diameter coarse powder falling from the settling channel 213. The coarse powder collection hopper 26 may be funnel-shaped to facilitate the concentrated collection of coarse powder. Its material may be the same as that of the lower cylinder 211 to ensure overall stability.

[0028] Please refer to Figures 1-5The pre-diverting mechanism 2 may further include a turbulence cone 27, which is coaxially fixed to the spinning impeller 24, with its tip facing the inlet duct 1. The turbulence cone 27 disrupts the stable flow of dust-laden gas in the central region, creating a velocity gradient difference and guiding coarse particles to stall and diffuse towards the duct edge. The turbulence cone 27 may have a streamlined design to reduce resistance to gas flow, and its material may be the same as that of the spinning impeller 24.

[0029] Please refer to Figures 1-4 The pre-diverting mechanism 2 may further include a grid plate 28, which is fixed to the upper opening of the upper cylinder 212. The pre-diverting mechanism 2 may also include a fixing column 29, located inside the upper cylinder 212 and fixed to the grid plate 28. The rotating impeller 24 is rotatably mounted on the fixing column 29. The fixing column 29 provides stable support and a rotation shaft for the rotating impeller 24, ensuring its normal rotation. The fixing column 29 may have a cylindrical structure and may be made of metal.

[0030] Please refer to Figure 1 and Figure 6 The centrifugal classification mechanism 3 includes a centrifugal cylinder 31, an exhaust pipe 32, a centrifugal impeller 33, and a drive assembly 34. The lower end of the centrifugal cylinder 31 is coaxially fixed to the upper end of the upper cylinder 212, and the upper end of the centrifugal cylinder 31 is connected to one end of the exhaust pipe 32. The centrifugal impeller 33 is rotatably disposed inside the centrifugal cylinder 31 and coaxially disposed with the centrifugal cylinder 31. The drive assembly 34 is connected to the centrifugal impeller 33 and is used to drive the centrifugal impeller 33 to rotate. When the pre-diverted dust-laden gas enters the centrifugal cylinder 31, the drive assembly 34 drives the centrifugal impeller 33 to rotate at high speed, generating a strong centrifugal force that throws coarse powder particles to the outside, while fine powder particles are discharged from the exhaust pipe 32 with the airflow, achieving further fine classification.

[0031] Please refer to Figure 1 and Figure 6 The drive assembly 34 includes a fixed base 341, a drive shaft 342, and a drive motor 343. The fixed base 341 is fixed to the exhaust pipe 32. The drive shaft 342 is rotatably mounted on the fixed base 341 and is coaxially and fixedly connected to the centrifugal impeller 33. The drive motor 343 is connected to the drive shaft 342 and is used to drive the drive shaft 342 to rotate. The drive motor 343 can be a three-phase asynchronous motor, which has the advantages of high power and high reliability; or it can be a DC servo motor, which facilitates precise speed control. The fixed base 341 serves to support the drive shaft 342, ensuring that the drive shaft 342 can rotate stably.

[0032] The implementation principle of this embodiment is as follows: Dust-laden gas enters through the inlet pipe 1, and the flow sensor 11 monitors its flow rate in real time. The gas first enters the guide tube 22 and flows upward under the guidance of the guide tube 22. When it passes through the spinning impeller 24, the spinning impeller 24 rotates under the action of gas flow, and performs preliminary separation of particles in the gas. At the same time, the turbulence cone 27 disrupts the flow state in the central area, causing coarse particles to diffuse towards the edge of the pipe. The regulating controller controls the gas injection assembly 25 to adjust the pressure in the gas injection chamber 231 according to the data from the flow sensor 11, changing the inner diameter of the elastic sleeve 23, so that the gas decelerates due to volume expansion. Large-diameter particles collide with the elastic sleeve 23 and are further decelerated, falling from the settling channel 213 to the coarse powder collection hopper 26, thus achieving pre-diversion. The pre-diverted gas enters the centrifugal classifier 3. The drive assembly 34 drives the centrifugal impeller 33 to rotate at high speed, using centrifugal force to separate coarse and fine powder. The fine powder is discharged from the exhaust pipe 32, while the coarse powder is thrown against the inner wall of the centrifugal cylinder 31 by centrifugal force, collides with the inner wall of the centrifugal cylinder 31 and decelerates, and then falls into the coarse powder collection hopper 26 below. This classification method makes full use of the velocity gradient effect and centrifugal force, and can effectively improve the classification quality and efficiency even under high Reynolds coefficient conditions and unstable flow conditions, reduce the content of coarse powder in the classified powder, reduce the number of secondary classifications that may be needed, and reduce production costs.

[0033] The control controller is configured to perform the following steps: (1) Obtain the flow rate Q of dust-containing gas monitored in real time by flow sensor 11; (2) Based on the target sedimentation particle size d p Particle density ρ p The gas dynamic viscosity μ is used to calculate the target settling velocity v using Stokes' theorem. s The formula is: Where g is the acceleration due to gravity; (3) Based on the flow rate Q and the target settling velocity v s The target inner diameter D of the elastic sleeve 23 was calculated using the fluid continuity equation. target The formula is: Where α is the safety factor (α≤1); (4) Based on the initial inner diameter D0 and deformation coefficient k of the elastic sleeve 23, the target pressure P of the air injection chamber 231 is calculated using the elastic deformation formula. in,target The formula is: Where P atm Atmospheric pressure; (5) Control the air injection assembly 25 to adjust the pressure in the air injection chamber 231 to P.in,target Adjust the inner diameter of the elastic sleeve 23 to D. target This controls the flow rate of the dust-laden gas within the elastic sleeve 23 to a certain value. And v≤α·v s To achieve a particle size greater than the target size d p Dust settles from settling channel 213.

[0034] The technical effects of the technical solution provided in this application include: (1) In the pre-diversion stage, the initial centrifugal force generated by the rotation of the self-rotating impeller 24 is used to make the coarse particles diffuse to the edge of the pipe in advance and settle down, reducing the load of coarse particles entering the centrifugal classification mechanism 3, and avoiding the escape of coarse particles to the central area due to fluid disturbance under high Reynolds coefficient conditions, thereby reducing the proportion of coarse powder in the classified powder and the tailing phenomenon of large particles. (2) Traditional processes rely on the air volume and speed of a single channel to control the grading quality. At high output, the air pressure and speed need to be increased significantly, resulting in a surge in energy consumption. This solution uses the dynamic matching between the flow sensor 11 and the air injection component 25 to adaptively adjust the inner diameter of the elastic sleeve 23 according to the actual flow, thereby ensuring the stability of the grading effect. (3) The independent settling channel 213 formed between the outer wall of the guide tube 22 and the lower cylinder 211 is completely separated from the air intake channel inside the guide tube 22, so that the upward airflow of dust-containing gas is completely separated from the settling path of coarse particles, avoiding the problem of coarse powder directly colliding with the rising airflow and mixing into the powder mist when falling back in the traditional process, ensuring that the air intake and powder discharge processes do not interfere with each other, and further improving the classification efficiency.

[0035] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of this application.

Claims

1. A high-efficiency impeller-type powder classifier suitable for high Reynolds coefficient operating conditions, characterized in that, include: An air intake pipe (1) is provided with a flow sensor (11); The pre-diversion mechanism (2) includes a pre-diversion shell (21), a guide tube (22), an elastic sleeve (23), a spinning impeller (24), a turbulence cone (27), an air injection assembly (25), and an adjustment controller. The pre-diversion shell (21) includes a lower cylinder (211) and an upper cylinder (212). The guide tube (22) is built into the lower cylinder (211). The lower end of the guide tube (22) is connected to the air inlet pipe (1). A settling channel (213) is formed between the outer wall of the guide tube (22) and the lower cylinder (211). The elastic sleeve (23) is fixed inside the upper cylinder (212). A sealed air injection chamber (231) is formed between the elastic sleeve (23) and the upper cylinder (212). The spinning impeller (24) is rotatably disposed inside the elastic sleeve (23) and located in the upper cylinder (212). Above the guide tube (22), the turbulence cone (27) is coaxially fixed to the spin impeller (24), with the tip of the turbulence cone (27) facing the air inlet pipe (1). The air injection assembly (25) is used to vent or extract air into the air injection chamber (231). The regulating controller is communicatively connected to the flow sensor (11) and the air injection assembly (25), and is used to control the air injection assembly (25) to adjust the pressure in the air injection chamber (231) according to the flow rate in the air inlet pipe (1), so as to change the inner diameter of the elastic sleeve (23). When the flow rate in the air inlet pipe (1) increases, the pressure in the air injection chamber (231) decreases, and the inner diameter of the elastic sleeve (23) increases, causing the dust-containing gas to reduce its flow velocity due to volume expansion, thereby causing large-diameter particles to fall from the settling channel (213). The centrifugal grading mechanism (3) has its inlet connected to the upper end of the upper cylinder (212).

2. The high-efficiency impeller-type powder classifier suitable for high Reynolds coefficient conditions according to claim 1, characterized in that, The guide tube (22) is a conical guide tube, the small diameter end of the conical guide tube is connected to the air inlet pipe (1), the spin impeller (24) is located above the large diameter end of the conical guide tube, and the lower cylinder (211) is a lower conical sleeve.

3. The high-efficiency impeller-type powder classifier suitable for high Reynolds coefficient conditions according to claim 1, characterized in that, The pre-diversion mechanism (2) also includes a coarse powder collection hopper (26), the upper end of which is connected to the lower end of the lower cylinder (211).

4. The high-efficiency impeller-type powder classifier suitable for high Reynolds coefficient conditions according to claim 1, characterized in that, An air inlet (232) communicating with the air inlet chamber (231) is provided on the outer side wall of the upper cylinder (212). The air inlet assembly (25) includes an air pump (251) and an air inlet pipe (252). The air pump (251) is connected to the air inlet (232) via the air inlet pipe (252).

5. The high-efficiency impeller-type powder classifier suitable for high Reynolds coefficient conditions according to claim 4, characterized in that, An air injection valve (233) is provided on the air injection port (232).

6. The high-efficiency impeller-type powder classifier suitable for high Reynolds coefficient conditions according to claim 1, characterized in that, The pre-diversion mechanism (2) also includes a grid plate (28), which is fixed to the upper opening of the upper cylinder (212).

7. The high-efficiency impeller-type powder classifier suitable for high Reynolds coefficient conditions according to claim 6, characterized in that, The pre-diversion mechanism (2) also includes a fixed column (29), which is located inside the upper cylinder (212). The fixed column (29) is fixed to the grid plate (28), and the self-rotating impeller (24) is rotatably mounted on the fixed column (29).

8. The high-efficiency impeller-type powder classifier suitable for high Reynolds coefficient conditions according to claim 1, characterized in that, The centrifugal grading mechanism (3) includes a centrifugal cylinder (31), an exhaust pipe (32), a centrifugal impeller (33), and a drive assembly (34). The lower end of the centrifugal cylinder (31) is coaxially fixed to the upper end of the upper cylinder (212). The upper end of the centrifugal cylinder (31) is connected to one end of the exhaust pipe (32). The centrifugal impeller (33) is rotatably disposed inside the centrifugal cylinder (31) and is coaxially disposed with the centrifugal cylinder (31). The drive assembly (34) is connected to the centrifugal impeller (33) and is used to drive the centrifugal impeller (33) to rotate.

9. The high-efficiency impeller-type powder classifier suitable for high Reynolds coefficient conditions according to claim 8, characterized in that, The drive assembly (34) includes a fixed base (341), a transmission shaft (342), and a drive motor (343). The fixed base (341) is fixed to the exhaust pipe (32). The transmission shaft (342) is rotatably mounted on the fixed base (341). The transmission shaft (342) is coaxially and fixedly connected to the centrifugal impeller (33). The drive motor (343) is connected to the transmission shaft (342) and is used to drive the transmission shaft (342) to rotate.

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