A high purity powder material fine classification device

Abstract

The utility model relates to a kind of high-purity powder substance fine classification device, belong to high-purity powder classification technical field, solve the low classification accuracy, classification effect is poor and other problems that powder classification technology in prior art is faced when processing fine particle.This utility model provides a kind of high-purity powder substance fine classification device, including the feeding assembly, charge intensification assembly and electrostatic classification assembly connected in order along material conveying direction;Feeding assembly includes powder conveying mechanism and air amplifier, one end of air amplifier is connected with powder conveying mechanism, the other end of air amplifier is connected with charge intensification assembly;Electrostatic classification assembly includes air compensation chamber and electrostatic classification cavity, air compensation chamber is located between the charge intensification cavity of charge intensification assembly and electrostatic classification cavity, air compensation chamber is equipped with air supplementing mouth, air supplementing mouth is used to supplement the air volume required when electrostatic classification.This utility model's classification device classification accuracy is high, and classification effect is good.

Description

Technical Field

[0001] This utility model relates to the field of high-purity powder classification technology, and in particular to a fine classification device for high-purity powder materials. Background Technology

[0002] High-purity powders refer to powdery substances with high purity, fine particles, and uniform distribution. Typically, their purity reaches 99.99% or higher, with extremely low impurity content. With the rapid development of science and technology, high-purity powders play a crucial role in cutting-edge fields such as electronic materials preparation, biomedicine, and aerospace.

[0003] Commonly used classification technologies for silicon powder include sieving, pneumatic classification, centrifugal classification, and sedimentation classification. However, these methods reveal numerous drawbacks when addressing the need for fine classification of high-purity silicon powder. Sieving equipment such as vibrating screens and rotary screens, while simple to operate, suffers from severe clogging due to the strong interparticle forces and electrostatic adsorption of high-purity silicon powder, leading to a sharp decline in classification efficiency and making it difficult to accurately separate high-purity silicon powder with minute particle size differences. Pneumatic classification often employs turbine-type air classifiers and cyclone separators. Although pneumatic classification can handle finer powders to some extent, the small particle size, large specific surface area, and light weight of high-purity silicon powder mean that even small changes in airflow velocity and pressure can significantly affect its movement, causing it to easily agglomerate in high-speed airflow, greatly reducing classification accuracy. Furthermore, during the classification process, the high-speed airflow carries silicon particles that impact the inner wall of the equipment, easily generating debris and impurities that mix into the high-purity powder, affecting its high-purity properties. Centrifugal classification equipment, such as centrifugal classifiers, is suitable for continuous operation and separation of large particles. However, high-purity silicon powder has a small particle size and light weight, resulting in very similar characteristics and low classification accuracy. Furthermore, high-speed operation of the equipment can easily damage the particle structure. Sedimentation classification equipment, such as settling tanks and centrifugal settling machines, also suffers from this problem. High-purity silicon powder has small differences in particle size and density, resulting in very similar settling velocities, making it difficult to form an effective separation interface. This leads to low classification efficiency, a slow process, and susceptibility to environmental disturbances. In addition, settling media such as water pose a risk of secondary pollution, severely affecting the properties of the powder particles, and increasing the workload of subsequent drying processes.

[0004] Electrostatic classification technology utilizes the difference in force experienced by particles in an electric field for separation, enabling dry classification of powders. It has advantages such as high classification accuracy and minimal impact on material purity. However, existing electrostatic classification devices have the following problems when processing high-purity powders: (1) uneven conveying and dispersion of powder materials, affecting particle charging and classification effect; (2) lack of a real-time monitoring and feedback system, making it difficult to achieve real-time control of operating parameters, thus affecting classification accuracy; (3) lack of flexible disassembly interfaces between modules, resulting in poor device structural adaptability. Therefore, it is urgent to develop a new type of fine classification device for high-purity powders with a reasonable structure, adjustable parameters, high classification accuracy, and combined with real-time monitoring and feedback control, in order to solve the above-mentioned problems and improve the accuracy and purity of high-purity powder classification. Utility Model Content

[0005] Based on the above analysis, the present invention aims to provide a fine classification device for high-purity powder materials to solve the problems of low classification accuracy and poor classification effect faced by existing powder classification technologies when processing fine particles.

[0006] This utility model provides a fine classification device for high-purity powder materials, including a feeding component, a charge enhancement component and an electrostatic classification component connected in sequence along the material conveying direction; The feeding assembly includes a powder conveying mechanism and an air amplifier. One end of the air amplifier is connected to the powder conveying mechanism, and the other end of the air amplifier is connected to the charge enhancement assembly. The electrostatic classification component includes an air compensation chamber and an electrostatic classification cavity. The air compensation chamber is located between the charge enhancement cavity of the charge enhancement component and the electrostatic classification cavity. The air compensation chamber is provided with an air supply port, which is used to supplement the air volume required during electrostatic classification.

[0007] Furthermore, the charge enhancement component also includes a corona electrode and a grounding plate, both of which are disposed within the charge enhancement cavity. The corona electrode is suspended in the middle of the charge enhancement cavity, and the grounding plate is disposed at the bottom of the charge enhancement cavity.

[0008] Furthermore, the charge enhancement assembly also includes an insulating mounting plate, one end of which is located inside the charge enhancement cavity and connected to the corona electrode, and the other end is connected to the top of the charge enhancement cavity.

[0009] Furthermore, the charge enhancement component also includes a connection channel, one end of which is connected to the air amplifier and the other end of which is connected to the charge enhancement cavity.

[0010] Furthermore, the electrostatic grading assembly also includes two electrode plates and multiple partition plates. The two electrode plates are arranged parallel to each other on the upper and lower sides of the electrostatic grading cavity, and the multiple partition plates are arranged inside the electrostatic grading cavity and located at the bottom of the electrostatic grading cavity.

[0011] Furthermore, it also includes a negative pressure ventilation assembly located downstream of the electrostatic grading assembly.

[0012] Furthermore, the negative pressure exhaust assembly includes an exhaust gas purification chamber, a variable frequency fan, and a filter element. The variable frequency fan is connected to the lower end of the exhaust gas purification chamber, the upper end of the exhaust gas purification chamber is connected to the electrostatic grading chamber, and the filter element is disposed inside the exhaust gas purification chamber.

[0013] Furthermore, the powder conveying mechanism includes a feeding chamber and a spiral feeding structure, wherein the feeding chamber is connected to the spiral feeding structure.

[0014] Furthermore, the spiral supply structure includes a rotating shaft and blades, with the blades spirally arranged along the outer circumference of the rotating shaft.

[0015] Furthermore, it also includes an installation frame, to which the feeding assembly, the charge enhancement assembly, the electrostatic grading assembly, and the negative pressure air intake assembly are all connected.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: (1) The present invention is provided with a feeding component, a charge enhancement component and an electrostatic classification component connected in sequence along the material conveying direction. The powder particles conveyed by the feeding component are first enhanced in the charge enhancement component and then enter the electrostatic classification component for classification, realizing independent control of the powder particle charging process and the classification process; and the powder conveying mechanism is connected to the air amplifier. The powder particles are conveyed to the air amplifier through the powder conveying mechanism. The feeding amount is first precisely controlled by mechanical means, and then the Venturi effect is used for pre-dispersion and acceleration, avoiding problems such as easy blockage of the feed port and agglomeration of powder particles, improving the uniform dispersion of high-purity powder before entering the charge enhancement chamber, thereby improving the accuracy and purity of powder material classification.

[0017] (2) This utility model achieves independent control of the particle charging process and the classification process by connecting the charge enhancement component and the electrostatic classification component in series and introducing an air compensation chamber structure. The air compensation chamber structure can not only adjust the air volume required for powder classification, but also ensure that the charged powder particles enter the classification zone in a stable state.

[0018] (3) This utility model adopts a modular design, and each unit is connected by screws and glue, which can be disassembled and assembled independently. It is convenient to change the electrode type, adjust the size of the classification chamber or optimize the flow field structure according to experimental or production needs. The device is flexible and highly adaptable.

[0019] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the description and accompanying drawings, which are particularly pointed out. Attached Figure Description

[0020] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0021] Figure 1 This is a schematic diagram of the micro-fine classification device for high-purity powder materials according to a specific embodiment. Figure 2 This is a schematic diagram of the feeding assembly in a specific embodiment; Figure 3 This is a schematic diagram of the charge enhancement component in a specific embodiment; Figure 4 This is a schematic diagram of the air compensation chamber in a specific embodiment; Figure 5 This is a schematic diagram of the connection structure between the air supply inlet and the air supply valve in a specific embodiment. Figure 6 This is a schematic diagram of the electrostatic grading cavity in a specific embodiment; Figure 7 This is a schematic diagram of the connection structure between the charge enhancement component and the electrostatic classification component in a specific embodiment; Figure 8 This is a schematic diagram of the connection structure of the charge enhancement component, the electrostatic grading component, and the negative pressure air intake component in a specific embodiment.

[0022] Figure label: 1-Feeding assembly; 11-Powder conveying mechanism; 111-Feeding chamber; 112-Screw feeding structure; 1121-Rotating shaft; 1122-Blade; 1123-Protective shell; 113-Motor; 114-Support; 12-Air amplifier; 2-Charge enhancement assembly; 21-Charge enhancement chamber; 22-Corona electrode; 23-Grounding electrode plate; 24-Insulating mounting plate; 25-Connecting channel; 3-Electrostatic classification assembly; 31-Air compensation chamber; 311-Make-up air inlet; 312-Make-up air valve; 32-Electrostatic classification chamber; 321-Door opening; 33-Electrode plate; 34-Separator plate; 4-Negative pressure exhaust assembly; 41-Exhaust gas purification chamber; 42-Variable frequency fan; 43-Filter element; 5-Mounting frame. Detailed Implementation

[0023] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0024] Another specific embodiment of this utility model, combined with Figure 1 , Figure 2 and Figure 7 As shown, a fine classification device for high-purity powder materials is disclosed, comprising a feeding assembly 1, a charge enhancement assembly 2, and an electrostatic classification assembly 3 connected sequentially along the material conveying direction. The feeding assembly 1 includes a powder conveying mechanism 11 and an air amplifier 12, with the powder conveying mechanism 11 connected to the air amplifier 12, and the air amplifier 12 connected to the charge enhancement assembly 2. The electrostatic classification assembly 3 includes an air compensation chamber 31 and an electrostatic classification chamber 32, with the air compensation chamber 31 located between the charge enhancement chamber 21 and the electrostatic classification chamber 32. Each of the two opposite side walls of the air compensation chamber 31 has a makeup air inlet 311, which is used to supplement the air volume required for electrostatic classification.

[0025] Compared with the prior art, the high-purity powder fine classification device provided in this embodiment is provided with a feeding component 1, a charge enhancement component 2, and an electrostatic classification component 3 connected in sequence along the material conveying direction. The powder particles conveyed by the feeding component 1 are first enhanced in charge enhancement component 2, and then enter the electrostatic classification component 3 for classification, realizing independent control of the powder particle charging process and the classification process. In addition, the powder conveying mechanism 11 is connected to the air amplifier 12. The powder particles are conveyed to the air amplifier 12 through the powder conveying mechanism 11. The feeding amount is first precisely controlled by mechanical means, and then the Venturi effect is used for pre-dispersion and acceleration, avoiding problems such as easy blockage of the feed port and agglomeration of powder particles. This improves the uniform dispersion of high-purity powder before entering the charge enhancement chamber 21, thereby improving the accuracy and purity of powder material classification.

[0026] like Figure 2 As shown, the powder conveying mechanism 11 includes a feeding chamber 111 and a screw feeding structure 112. The feeding chamber 111 is connected to the screw feeding structure 112, and powder particles are conveyed to the screw feeding structure 112 through the feeding chamber 111. The screw feeding structure 112 includes a rotating shaft 1121, blades 1122, and a protective shell 1123. The blades 1122 are spirally arranged along the outer circumference of the rotating shaft 1121. Both the blades 1122 and the rotating shaft 1121 are disposed within the protective shell 1123. The feeding chamber 111 is connected to the protective shell 1123, so that the powder particles in the feeding chamber 111 are directly conveyed through the rotating shaft 1121.

[0027] To achieve the rotation of the rotating shaft 1121, such as Figure 2 As shown, the powder conveying mechanism 11 also includes a motor 113 and a mounting base 114. The motor 113 is connected to the mounting base 114, and the screw feeding structure 112 is mounted on the mounting base 114. One end of the rotating shaft 1121 is connected to the motor 113, and the other end of the rotating shaft 1121 extends into the protective housing 1123. The motor 113 drives the rotating shaft 1121 to rotate, and the blades 1122 carry the powder particles forward. The protective housing 1123 extends to the air amplifier 12, and the powder particles conveyed from the rotating shaft 1121 enter the air amplifier 12. By controlling the rotation speed of the motor 113, precise quantitative feeding of powder materials can be achieved, and the processing capacity can be continuously adjusted within the range of 3-60 g / min.

[0028] The air amplifier 12, model LT100A, is located at the outlet of the powder conveying mechanism 11. It utilizes a high-speed airflow to create a negative pressure zone through the Venturi effect, uniformly drawing in and accelerating the input powder material. After thorough mixing with the supplementary airflow, a stable gas-solid two-phase flow is formed, which then enters the charge-enhancing component 2. This combined design of the powder conveying mechanism 11 and the air amplifier 12 effectively prevents material blockage at the feed inlet and ensures uniform dispersion of the material before it enters the main conveying pipeline.

[0029] It is worth noting that a mass flow sensor and a capacitive humidity sensor are installed at the inlet of the feeding assembly 1, which can monitor the feeding rate and the humidity of the ambient airflow in real time.

[0030] In this embodiment, high-purity silicon powder enters the spiral feeding structure 112 through the feeding chamber 111. After being fed at a given speed, it moves forward with the rotation of the blades 1122, and is then dispersed and conveyed at the air amplifier 12 before entering the charge enhancement component 2. The combined design of the powder conveying mechanism 11 and the air amplifier 12 enables powder conveying without mechanical impellers, effectively preventing material blockage at the feed inlet, while also ensuring the continuity and stability of the feeding and the uniform dispersion of the material before entering the main conveying pipeline.

[0031] The charge enhancement component 2 is used to charge the passing powder particles, and the charged powder particles are carried by the airflow into the electrostatic classification component 3. Specifically, combined with Figure 1 , Figure 3 and Figure 7 As shown, the charge enhancement component 2 includes a charge enhancement cavity 21, a corona electrode 22 (i.e., a discharge electrode), and a grounding plate 23. The charge enhancement cavity 21 is made of highly insulating transparent organic glass, and its interior is kept sealed to prevent leakage and external interference. Both the corona electrode 22 and the grounding plate 23 are located inside the charge enhancement cavity 21. The corona electrode 22 is suspended in the middle of the charge enhancement cavity 21, and the grounding plate 23 is made of a metal plate and is located at the bottom of the charge enhancement cavity 21. The corona electrode 22 can be selected from different forms such as barbed wire electrodes, two-tooth electrodes, or four-tooth electrodes as needed.

[0032] Combination Figure 1 , Figure 3 and Figure 7 As shown, the charge enhancement assembly 2 also includes an insulating mounting plate 24 and a first high-voltage DC power supply (not shown in the figure). One end of the insulating mounting plate 24 is located inside the charge enhancement cavity 21 and connected to the corona electrode 22, while the other end is connected to the top of the charge enhancement cavity 21. The output terminal of the first high-voltage DC power supply is connected to one end of the corona electrode 22. The voltage range of the first high-voltage DC power supply is -100kV to +100kV, used to generate stable corona discharge. The grounding plate 23 is connected to the grounding electrode of the first high-voltage DC power supply, forming an electric field region with the corona electrode 22.

[0033] Understandably, combined Figure 1 and Figure 7 As shown, the charge enhancement component 2 also includes a connection channel 25, one end of which is connected to the air amplifier 12 and the other end is connected to the charge enhancement cavity 21.

[0034] In this embodiment, high-purity powder enters the charge enhancement cavity 21 via the airflow from the feeding assembly 1. When passing through the electric field region between the corona electrode 22 and the grounding plate 23, it gains charge through corona discharge. The charge efficiency and charge stability of the particles can be optimized by adjusting parameters such as particle size, dielectric constant, electric field voltage, and electrode spacing. A high-voltage voltage / current sensor is connected to the output terminal of the first high-voltage DC power supply to monitor the discharge status in real time and prevent electric shock.

[0035] Combination Figure 1 , Figure 6 and Figure 7As shown, the electrostatic grading assembly 3 also includes two electrode plates 33, which are arranged parallel to each other on the upper and lower sides of the electrostatic grading cavity 32. One electrode plate 33 is connected to the top of the electrostatic grading cavity 32, and the other electrode plate 33 is connected to the bottom of the electrostatic grading cavity 32. Exemplarily, the two electrode plates 33 are threadedly fixed to the aluminum alloy fixing frame by pre-embedded countersunk screws extending from the inside to the outside on the upper and lower sides of the electrostatic grading cavity 32. It can be understood that, as Figure 4 and Figure 5 As shown, the air inlet 311 is connected to an independently controllable air inlet valve 312. To rectify and evenly distribute the airflow, the inner side of the air inlet 311 is equipped with a grid and needle-punched felt to ensure that the charged powder particles enter the electrostatic classification chamber 32 in a stable state. The electrostatic classification chamber 32 is made of highly insulating transparent acrylic glass.

[0036] It is worth noting that the opening of the air compensation chamber 31 from the charge enhancement chamber 21 to the electrostatic classification chamber 32 gradually increases, that is, the upper and lower side plates of the air compensation chamber 31 are set horizontally, the two side plates are set at an angle, and the air supply port 311 is set on the two angled side plates.

[0037] Combination Figure 6 and Figure 7 As shown, the electrostatic classification component 3 also includes separator plates 34 and a second high-voltage DC power supply (not shown in the figure). Two electrode plates 33 are respectively connected to the output terminal and ground terminal of the second high-voltage DC power supply. The voltage range of the second high-voltage DC power supply is -100kV to +100kV, used to generate a stable electric field. Multiple separator plates 34 are disposed inside the electrostatic classification cavity 32 and located at the bottom of the electrostatic classification cavity 32. Their position and angle can be precisely adjusted according to the target classification particle size. Charged particles move along different trajectories under the combined action of electric field force, airflow resistance, and gravity. By setting multiple separator plates 34, particle groups with different movement trajectories can be introduced into the corresponding separator plates 34 to achieve multi-level precision classification. For example, the two ends of the separator plates 34 are connected to the side wall of the electrostatic classification cavity 32 through slots. The spacing between adjacent separator plates 34 can be adjusted by sliding along the slots.

[0038] To facilitate the collection of the graded powder material and the adjustment of the spacing of the separator plates 34, such as Figure 6 and Figure 7 As shown, a doorway 321 that can be opened and closed is provided on the lower side wall of the electrostatic classification chamber 32. The doorway 321 is pressed shut by a quick-pressing plate, and the uncollected ultrafine particles enter the subsequent unit with the main airflow.

[0039] In this embodiment, the powder particles charged by the charge enhancement component 2 enter the air compensation chamber 31 with the airflow. Two air inlets 311 on both sides of the air compensation chamber 31 supply air according to the required airflow for grading. The supplied air is rectified by the main air duct through the grille and needle-punched felt, while the charged particles undergo a transition within the air compensation chamber 31. The charged particles then enter the electric field formed by the parallel electrode plates 33 with the airflow. Under the combined action of the electric field and airflow, particles of different sizes enter their corresponding separator plates 34, achieving precise grading. By adjusting the voltage, airflow rate, and position of the separator plates 34, the efficiency of fine particle grading can be effectively improved.

[0040] It is worth noting that thermal wind speed sensors and micro differential pressure sensors are installed at the air supply inlet 311, the inlet of the electrostatic grading chamber 32, and the outlet to monitor the airflow status in real time.

[0041] like Figure 1 As shown, the fine classification device for high-purity powder materials also includes a negative pressure fan assembly 4, which is located downstream of the electrostatic classification assembly 3. That is, the feeding assembly 1, the charge enhancement assembly 2, the electrostatic classification assembly 3 and the negative pressure fan assembly 4 are connected in sequence along the material conveying direction.

[0042] Combination Figure 1 and Figure 8 As shown, the negative pressure exhaust assembly 4 includes an exhaust gas purification chamber 41, a variable frequency fan 42, and a filter element 43. The exhaust gas purification chamber 41 is located downstream of the electrostatic classification chamber 32. The variable frequency fan 42 is connected to the lower end of the exhaust gas purification chamber 41, and the upper end of the exhaust gas purification chamber 41 is connected to the electrostatic classification chamber 32. The filter element 43 is located inside the exhaust gas purification chamber 41. The filter element 43 includes high-efficiency filter media such as needle-punched felt and filter screens, used to capture unsettled fine powder particles, preventing particles from being discharged with the exhaust gas and causing secondary pollution, thus ensuring the cleanliness of the laboratory or production environment. The variable frequency fan 42 is located at the end of the classification system. A three-way valve and a control valve are installed at the inlet of the variable frequency fan 42 to control the incoming air volume, thereby controlling the air volume and speed in the loop, maintaining the airflow circulation of the entire device, ensuring that the powder particles smoothly complete the charging and classification process under the drive of the airflow, and introducing the gas-solid mixture into the exhaust gas purification chamber 41 after classification.

[0043] It is worth noting that a wind speed sensor and a pressure sensor are installed at the outlet of the variable frequency fan 42 to monitor the airflow speed and pressure difference in real time, so as to promptly determine whether there is a blockage or leakage in the air path. A humidity sensor is also installed to monitor the air humidity.

[0044] The high-purity powder fine classification device also includes a monitoring and control unit, which comprises a sensor network and a circuit controller. The sensor network includes wind speed sensors, humidity sensors, pressure sensors, mass flow sensors, voltage sensors, and current sensors. Wind speed and pressure sensors are located at the outlet of the variable frequency fan 42, the inlet of the charge enhancement chamber 21, and the inlet and outlet of the electrostatic classification chamber 32 to monitor airflow velocity and pressure difference in real time, promptly determining whether there is blockage or leakage in the air path. Humidity sensors are located at the air inlets (the air inlet of the air amplifier 12 and the air inlet of the variable frequency fan 42) and the air compensation chamber 31 to monitor air humidity and prevent excessive humidity from causing a decrease in powder charging efficiency or increased agglomeration. A mass flow sensor is located at the feed inlet to monitor the feeding rate of the screw feeder. Voltage and current sensors are respectively installed at the high-voltage power ports of the charging electrode and the classification electrode to detect electric field strength and corona discharge status. The circuit controller controls the rotational speed of the motor 113 of the powder conveying mechanism 11 to precisely adjust the feed rate.

[0045] In this embodiment, during the entire operation, the wind speed sensor, humidity sensor, and voltage / current sensor monitor the operating parameters of each module in real time. The control system adjusts the power of the variable frequency fan 42, the opening degree of the air supply valve 312 of the air compensation chamber 31, and the high-voltage power output according to the monitoring results, so as to achieve precise control of the system operating parameters and ensure the stability and high precision of the grading process.

[0046] like Figure 1 As shown, the high-purity powder fine classification device also includes a mounting frame 5, and the feeding component 1, charge enhancement component 2, electrostatic classification component 3, and negative pressure exhaust component 4 are all connected to the mounting frame 5. The feeding component 1, charge enhancement component 2, electrostatic classification component 3, and negative pressure exhaust component 4 are connected by screws and glued together; the monitoring and control unit is distributed in the key parts of the classification device composed of the various units connected in series (i.e., the parts where the sensors are installed).

[0047] In this embodiment, the feeding component 1 adopts a combination design of powder conveying mechanism 11 and air amplifier. First, the feeding amount is precisely controlled mechanically, and then the Venturi effect is used for pre-dispersion and acceleration, avoiding problems such as powder particles clogging the feeding port and agglomeration, thus improving the uniform dispersion of powder before entering the charge strengthening chamber 21. Through the series design of charge strengthening component 2 and electrostatic classification component 3, and the introduction of air compensation chamber 31 structure, independent control of particle charging process and classification process is realized. The air compensation chamber 31 structure can not only adjust the air volume required for powder classification, but also ensure that charged powder particles enter the classification zone in a stable state. By integrating multiple sensors such as wind speed, humidity, and mass flow rate, as well as system circuit controller, the detection and control unit can realize real-time monitoring of key system parameters and precise circuit control, ensuring the safety and stability of system operation. Through the modular design, each unit is connected by screw bonding and can be independently disassembled and assembled, which is convenient for changing electrode type, adjusting classification chamber size, or optimizing flow field structure according to experimental or production needs, making the device flexible and adaptable.

[0048] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fine classification device for high-purity powder materials, characterized in that, It includes a feeding assembly (1), a charge enhancement assembly (2), and an electrostatic classification assembly (3) connected sequentially along the material conveying direction; The feeding assembly (1) includes a powder conveying mechanism (11) and an air amplifier (12). One end of the air amplifier (12) is connected to the powder conveying mechanism (11), and the other end of the air amplifier (12) is connected to the charge enhancement assembly (2). The electrostatic classification component (3) includes an air compensation chamber (31) and an electrostatic classification cavity (32). The air compensation chamber (31) is located between the charge enhancement cavity (21) of the charge enhancement component (2) and the electrostatic classification cavity (32). The air compensation chamber (31) is provided with an air supply port (311), which is used to supplement the air volume required during electrostatic classification.

2. The fine classification device for high-purity powder materials according to claim 1, characterized in that, The charge enhancement component (2) further includes a corona electrode (22) and a grounding electrode (23). The corona electrode (22) and the grounding electrode (23) are both disposed in the charge enhancement cavity (21). The corona electrode (22) is suspended in the middle part of the charge enhancement cavity (21), and the grounding electrode (23) is disposed at the bottom of the charge enhancement cavity (21).

3. The fine classification device for high-purity powder materials according to claim 2, characterized in that, The charge enhancement component (2) further includes an insulating mounting plate (24), one end of which is located inside the charge enhancement cavity (21) and connected to the corona electrode (22), and the other end is connected to the top of the charge enhancement cavity (21).

4. The fine classification device for high-purity powder materials according to claim 2, characterized in that, The charge enhancement component (2) also includes a connection channel (25), one end of which is connected to the air amplifier (12) and the other end is connected to the charge enhancement cavity (21).

5. The fine classification device for high-purity powder materials according to any one of claims 1-4, characterized in that, The electrostatic grading assembly (3) further includes two electrode plates (33) and multiple partition plates (34). The two electrode plates (33) are arranged in parallel on the upper and lower sides of the electrostatic grading cavity (32), and the multiple partition plates (34) are arranged inside the electrostatic grading cavity (32) and located at the bottom of the electrostatic grading cavity (32).

6. The fine classification device for high-purity powder materials according to any one of claims 1-4, characterized in that, It also includes a negative pressure air intake assembly (4) located downstream of the electrostatic grading assembly (3).

7. The fine classification device for high-purity powder materials according to claim 6, characterized in that, The negative pressure exhaust assembly (4) includes an exhaust gas purification chamber (41), a variable frequency fan (42), and a filter element (43). The variable frequency fan (42) is connected to the lower end of the exhaust gas purification chamber (41), and the upper end of the exhaust gas purification chamber (41) is connected to the electrostatic grading chamber (32). The filter element (43) is located inside the exhaust gas purification chamber (41).

8. The fine classification device for high-purity powder materials according to any one of claims 1-4 and 7, characterized in that, The powder conveying mechanism (11) includes a feeding chamber (111) and a spiral feeding structure (112), wherein the feeding chamber (111) is connected to the spiral feeding structure (112).

9. The fine classification device for high-purity powder materials according to claim 8, characterized in that, The spiral supply structure (112) includes a rotating shaft (1121) and blades (1122), the blades (1122) being spirally arranged along the outer periphery of the rotating shaft (1121).

10. The fine classification device for high-purity powder materials according to claim 6, characterized in that, It also includes an installation frame (5), and the feeding component (1), the charge enhancement component (2), the electrostatic grading component (3) and the negative pressure air intake component (4) are all connected to the installation frame (5).

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