Electrostatic dispersion device for turbo-type airflow classifier
By introducing an electrostatic dispersion device into the turbine airflow classifier, the powder particles are dispersed in the corona electric field, solving the problem of difficulty in dispersing ultrafine powders and improving the extension efficiency and grading accuracy.
Patent Information
- Application Number
- CN202420816569.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-04-19
AI Technical Summary
Existing turbine airflow classifiers are difficult to effectively disperse ultrafine powders, especially ultrafine powders with particle sizes of 1-2um, resulting in low extension efficiency and grading accuracy.
An electrostatic dispersion device for a turbine airflow classifier is designed. By adding an electrostatic dispersion device on the basis of the original dispersion disk dispersion structure, the powder particles are dispersed with the same polar charge in the corona electric field.
The sufficient dispersion of the fine powders to be graded is achieved, the extension efficiency and grading accuracy are significantly improved, and the problem of ultra-fine powders being difficult to rank in dry method is overcome.
Smart Images
Figure CN222606698U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of airflow classifiers, in particular to an electrostatic dispersion device used for a turbine-type airflow classifier. Background Art
[0002] Turbine airflow classifier is one of the most important equipment in dry preparation of powder in cement, mineral processing, chemical, grain processing, electronics, medicine and other industries.
[0003] After ultrafine treatment, the ultrafine powder presents different characteristics from the original material. First, the specific surface area increases and the surface energy increases; second, the proportion of atoms or ions on its surface increases greatly, which increases their activity and the attraction between particles; or it is easy to aggregate due to the effect of foreign impurities such as water; ultrafine particles are also easy to accumulate on the surface of large particles due to collision absorption or electrostatic force after crushing to produce large-size secondary particles, making the classification of ultrafine products more difficult than ordinary products. In order to improve the efficiency and classification accuracy of the classifier, scientific and technological workers in this industry have conducted a lot of research on the classification mechanism of the turbine airflow classifier and the dispersion mechanism of the powder in the machine. They believe that the primary task of classification is to disperse the particles and make them in a monodisperse state, thereby improving the dispersion of the powder, that is, the basis of ultrafine powder classification lies in the dispersion of powder particles. It can be said that sufficient dispersion can make the classification process more efficient. Therefore, from the structural aspect, adding dispersers inside the machine, improving the annular space structure, improving the structure of the spreading plate, etc., enhance the dispersibility of the powder and improve the classification accuracy; from the process parameters, by increasing the air inlet air velocity, changing the turbine rotor speed, adjusting the feed rate, etc., the dispersibility of the powder inside the machine is improved, and the classification accuracy and classification efficiency are improved. However, these measures cannot adapt to the dispersion problems of all powders. Some powders have a large viscosity or are prone to generate static charges during collision and friction, which enhances the agglomeration of ultrafine powders (especially ultrafine powders with a particle size of 1-2um). It is difficult for general dispersion methods to achieve good dispersion effects, and ideal classifier efficiency and classification accuracy cannot be obtained. Therefore, the applicant designs an electrostatic dispersion device for a turbine airflow classifier to improve the above problems. Utility Model Content
[0004] 1. Technical problems to be solved by the utility model
[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide an electrostatic dispersion device for a turbine-type airflow classifier. By adding an electrostatic dispersion device on the basis of the original dispersion disk dispersion structure, the micro-powder to be classified entering the classifier with the airflow is fully dispersed, so that the classifier efficiency and classification accuracy are greatly improved.
[0006] 2. Technical solution
[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0008] An electrostatic dispersion device for a turbine airflow classifier, comprising a coarse powder storage cone, a feeding device, an electrostatic dispersion device, a classification chamber, a classification upper end and a high-voltage power supply, wherein the feeding device is mounted on the top of the coarse powder storage cone, the electrostatic dispersion device is mounted on the top of the feeding device, the classification chamber is mounted on the top of the electrostatic dispersion device, and the classification upper end is mounted on the top of the classification chamber;
[0009] The electrostatic dispersion device includes a shell, a columnar conductor is arranged at the center of the shell, a thorn electrode is arranged on the outside of the columnar conductor, a terminal is connected to the columnar conductor, and the terminal is connected to the negative pole of the high-voltage power supply. A grounding plate is fixedly connected to the bottom of the shell, and the grounding plate is grounded through a wire. A rapping hammer is fixedly installed on the outer wall of the shell.
[0010] Preferably, the barb electrodes are evenly distributed in multiple layers along the length direction of the columnar conductor, and each layer of the barb electrodes is evenly distributed at 90° angles to each other along the circumferential direction of the columnar conductor. The barb electrodes are made of nickel-chromium wires, and the needle tips of the barb electrodes are arranged radially outward along the columnar conductor.
[0011] Preferably, an insulating seat is fixedly connected to the bottom of the columnar conductor, and a supporting seat is also fixedly connected to the inside of the shell, and the insulating seat is fixedly installed on the supporting seat.
[0012] Preferably, the insulating seat is made of polytetrafluoroethylene material and has a conical structure.
[0013] Preferably, a coarse powder discharge port is provided at the bottom of the coarse powder storage cone, and a relevant air discharger is installed on the coarse powder storage cone at the coarse powder discharge port.
[0014] Preferably, the feeding device is provided with a primary air inlet pipe and a secondary air inlet, and the top of the primary air inlet pipe is provided with a feeding port.
[0015] Preferably, a turbine rotor is provided in the grading chamber, a driving motor is fixedly installed on the top of the grading upper end, a driving shaft of the turbine rotor passes through the grading upper end and is fixedly connected to the driving end of the driving motor, and a fine powder outlet is opened on one side of the grading upper end.
[0016] 3. Beneficial effects
[0017] Compared with the prior art, the beneficial effects of the utility model are:
[0018] The utility model is applied to a turbine airflow classifier, and an electrostatic dispersing device is added on the basis of the original dispersing structure of a dispersing disk. By making the powder particles be charged with the same polarity in the corona electric field, the Coulomb repulsion between the particles is utilized for dispersion, so that the micro powder to be classified entering the classifier with the airflow is fully dispersed, so that the classifier efficiency and classification accuracy are greatly improved, and a good foundation is laid for overcoming the difficulty that ultrafine powder less than 1-2um is difficult to classify by dry method. This method will not introduce other impurities, has good dispersing effect and is simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the overall structure of an electrostatic dispersion device used in a turbine-type airflow classifier;
[0020] Figure 2 Schematic diagram of the electrostatic dispersion device structure.
[0021] In the figure: 1. coarse powder storage cone; 11. air shut-off discharger; 12. coarse powder discharge port; 2. feeding device; 21. primary air inlet pipe; 22. feeding port; 23. secondary air inlet; 3. electrostatic dispersion device; 31. thorn electrode; 32. insulating seat; 33. supporting seat; 34. vibrating hammer; 35. grounding plate; 36. terminal; 37. shell; 4. grading chamber; 41. turbine rotor; 5. grading upper end; 51. driving motor; 52. fine powder outlet; 6. high voltage power supply. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0023] Example:
[0024] See also Figure 1-Figure 2 The present embodiment provides an electrostatic dispersion device for a turbine airflow classifier, which includes a coarse powder storage cone 1, a feeding device 2, an electrostatic dispersion device 3, a classification chamber 4, a classification upper end 5 and a high-voltage power supply 6. The feeding device 2 is installed on the top of the coarse powder storage cone 1, the electrostatic dispersion device 3 is installed on the top of the feeding device 2, the classification chamber 4 is installed on the top of the electrostatic dispersion device 3, and the classification upper end 5 is installed on the top of the classification chamber 4.
[0025] In this embodiment, if Figure 2As shown, the electrostatic dispersion device 3 includes a shell 37, a columnar conductor is arranged at the center of the shell 37, and a thorn electrode 31 is arranged outside the columnar conductor, wherein the thorn electrodes 31 are evenly distributed in multiple layers along the length direction of the columnar conductor, and each layer of thorn electrodes 31 is evenly distributed at 90° angles to each other along the circumferential direction of the columnar conductor. The thorn electrodes 31 are made of nickel-chromium wires, and the needle tips of the thorn electrodes 31 are arranged radially outward along the columnar conductor. A terminal 36 is connected to the columnar conductor, and the terminal 36 is connected to the negative electrode of the high-voltage power supply 6. The voltage of the high-voltage power supply 6 is preferably 10-60kV. A grounding plate 35 is fixedly connected to the bottom of the shell 37, and the grounding plate 35 is grounded through a wire. The shell 3 A rapping hammer 34 is fixedly mounted on the outer wall of 7, the barbed electrode 31 is connected to the negative electrode of the high-voltage power supply 6 through the terminal 36 to become a discharge electrode, the shell 37 is a conical cylinder made of stainless steel, and is grounded through the grounding plate 35 to become a static electrode. The discharge electrode and the static electrode form a corona electric field. When a high voltage is applied between the barbed electrode 31 and the grounding electrode by the high-voltage power supply 6, the air is not broken down, and only the gas around the barbed electrode 31 is ionized, and a gaseous ion flow is generated between the electrodes. When the powder particles enter between the electrodes with the air flow, the particles collide with the charged particles and are charged. Since the charges carried by the particles are of the same kind, they repel each other under the action of the Coulomb force, thereby achieving the purpose of electrostatic dispersion.
[0026] In this embodiment, if Figure 2 As shown, an insulating seat 32 is fixedly connected to the bottom of the columnar conductor. The insulating seat 32 is made of polytetrafluoroethylene material. The insulating seat 32 has a withstand voltage of not less than 100 kV. The insulating seat 32 is a conical structure, so that the insulating seat 32 acts as a dispersion disk when the airflow carries the powder upward. A support seat 33 is also fixedly connected to the inside of the shell 37. The insulating seat 32 is fixedly installed on the support seat 33. The support seat 33 is preferably two fixed plates symmetrically fixed in the shell 37. The large flat surface of the insulating seat 32 is fixed on the support seat 33 at the bottom, and the space between the fixed plate and the shell 37 can be used for powder to pass through.
[0027] In this embodiment, if Figure 1 As shown, a coarse powder discharge port 12 is provided at the bottom of the coarse powder storage cone 1, and a wind-off discharger 11 is installed on the coarse powder storage cone 1 at the coarse powder discharge port 12. After the powder is separated, the coarse powder falls into the coarse powder storage cone 1, is opened by the wind-off discharger 11, and is discharged from the coarse powder discharge port 12.
[0028] In this embodiment, if Figure 1As shown, the feeding device 2 is provided with a primary air inlet pipe 21 and a secondary air inlet port 23. A feeding port 22 is provided on the top of the primary air inlet pipe 21. The powder is added from the feeding port 22 and brought into the classification chamber 4 by the negative pressure wind entering from the primary air inlet pipe 21. In the process of coarse powder falling, it is washed by the secondary air entering from the secondary air inlet port 23, and the fine powder mixed therein is carried back to the classification chamber 4 by the air flow to continue to participate in classification.
[0029] In this embodiment, if Figure 1 As shown, a turbine rotor 41 is arranged in the classification chamber 4, and the turbine rotor 41 is preferably a cage-shaped turbine rotor. A driving motor 51 is fixedly installed on the top of the classification upper end 5, and the driving shaft of the turbine rotor 41 passes through the classification upper end 5 and is fixedly connected to the driving end of the driving motor 51. The driving motor 51 is controlled by a frequency converter. A fine powder outlet 52 is opened on one side of the classification upper end 5. The turbine rotor 41 rotates at a high speed under the drive of the driving motor 51, and generates centrifugal force on the powder particles. Under the combined action of the centrifugal force and the air drag, the coarse and fine particles of the powder are classified, and the fine particles pass through the cage-shaped turbine rotor 41 and are discharged from the classifier through the fine powder outlet 52 of the classification upper end 5 and are collected by the collector.
[0030] Working principle: When in use, when working, powder is added from the feed port 22, and is brought into the classification chamber 4 by the negative pressure wind entering from the primary air inlet pipe 21. Due to the inertial force, the powder is dispersed by the high-speed impact of the airflow on the bottom of the insulating seat 32, and rises along the periphery of the insulating seat 32 into the corona electric field of the electrostatic dispersion device 3. When the high-voltage power supply 6 is turned on, the thorn electrode 31 generates a tip discharge, ionizing the air in the electrostatic field, generating a gaseous ion flow, and the powder particles collide and adsorb with the charged ions and carry the same charge. Under the action of the Coulomb force, they repel each other, so that the powder particles are further dispersed. The effectively dispersed powder continues to rise with the airflow into the classification chamber 4. The turbine rotor 41 rotates at a high speed under the drive of the drive motor 51, generating a centrifugal force on the powder particles. Under the combined effect of the centrifugal force and the air drag force, the powder particles are further dispersed. Under the action, the coarse and fine particles of the powder are classified, the fine particles pass through the cage-shaped turbine rotor 41 and are discharged from the classifier through the fine powder outlet 52 at the upper end 5 of the classification, and are collected by the collector, the coarse powder falls into the coarse powder storage cone 1, and is discharged from the coarse powder discharge port 12. In the process of the coarse powder falling, it is subjected to the elution effect of the secondary air entering from the secondary air inlet 23, and the mixed fine powder is carried back to the classification chamber 4 by the airflow to continue to participate in the classification. Through the application of the utility model in the turbine airflow classifier, an electrostatic dispersion device is added on the basis of the original dispersion structure of the dispersion disk, so that the micro powder to be classified entering the classifier with the airflow is fully dispersed, so that the efficiency of the classifier and the classification accuracy are greatly improved, and a good foundation is laid for overcoming the problem that ultrafine powder less than 1-2um is difficult to be classified by dry method.
[0031] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.
Claims
1. An electrostatic dispersion device for a turbine airflow classifier, characterized in that: The invention comprises a coarse powder storage cone (1), a feeding device (2), an electrostatic dispersion device (3), a classification chamber (4), a classification upper end (5) and a high-voltage power supply (6), wherein the feeding device (2) is mounted on the top of the coarse powder storage cone (1), the electrostatic dispersion device (3) is mounted on the top of the feeding device (2), the classification chamber (4) is mounted on the top of the electrostatic dispersion device (3), and the classification upper end (5) is mounted on the top of the classification chamber (4); The electrostatic dispersion device (3) comprises a shell (37), a columnar conductor is arranged at the center of the shell (37), a thorn electrode (31) is arranged on the outside of the columnar conductor, a terminal (36) is connected to the columnar conductor, and the terminal (36) is connected to the negative electrode of the high-voltage power supply (6), a grounding plate (35) is fixedly connected to the bottom of the shell (37), and the grounding plate (35) is grounded through a wire, and a rapping hammer (34) is fixedly installed on the outer wall of the shell (37).
2. The electrostatic dispersion device for a turbine airflow classifier according to claim 1, characterized in that: The thorn electrodes (31) are evenly distributed in multiple layers along the length direction of the columnar conductor, and each layer of the thorn electrodes (31) is evenly distributed at 90 degrees to each other along the circumferential direction of the columnar conductor. The thorn electrodes (31) are made of nickel-chromium wires, and the needle tips of the thorn electrodes (31) are arranged radially outward along the columnar conductor.
3. The electrostatic dispersion device for a turbine airflow classifier according to claim 1, characterized in that: An insulating seat (32) is fixedly connected to the bottom of the columnar conductor, a support seat (33) is also fixedly connected to the inside of the housing (37), and the insulating seat (32) is fixedly mounted on the support seat (33).
4. The electrostatic dispersion device for a turbine airflow classifier according to claim 3, characterized in that: The insulating seat (32) is made of polytetrafluoroethylene material, and the insulating seat (32) is a conical structure.
5. The electrostatic dispersion device for a turbine airflow classifier according to claim 1, characterized in that: A coarse powder discharge port (12) is provided at the bottom of the coarse powder storage cone (1), and an air discharger (11) is installed on the coarse powder storage cone (1) at the coarse powder discharge port (12).
6. The electrostatic dispersion device for a turbine airflow classifier according to claim 1, characterized in that: The feeding device (2) is provided with a primary air inlet pipe (21) and a secondary air inlet port (23), and a feeding port (22) is provided at the top of the primary air inlet pipe (21).
7. The electrostatic dispersion device for a turbine airflow classifier according to claim 1, characterized in that: A turbine rotor (41) is arranged in the classification chamber (4), a driving motor (51) is fixedly mounted on the top of the classification upper end (5), a driving shaft of the turbine rotor (41) passes through the classification upper end (5) and is fixedly connected to the driving end of the driving motor (51), and a fine powder outlet (52) is provided on one side of the classification upper end (5).