A portable dust generation device

Abstract

The utility model discloses a portable dust generating device, including high pressure gas source, dust generator, mix uniform cabin and shunt device, and high pressure gas source is connected with the top of mix uniform cabin through two shunt gas paths, and dust generator is located on one of shunt gas paths, and the other shunt gas path is equipped with electrostatic gun, and mix uniform cabin is equipped with detachable screen rack and dust storage box, and shunt device is equipped with sampling port, and the inlet of shunt device is connected with mix uniform cabin inside through sampling pipe, and the end of sampling pipe that stretches into mix uniform cabin is located between screen rack and dust storage box, and sampling pipe is connected with calibration gas path, the utility model discloses through the uniform stability of lifting dust granularity, can replace screen according to need dust particle size, realizes dust particle size adjustable, thereby realizes the dust environment of specific particle size, can take out the dust after testing in time, does not influence the follow -up experiment, can generate the dust of full concentration range, realizes detection calibration, satisfies the detection demand of different concentration range.

Description

Technical Field

[0001] This utility model relates to the technical field of dust generating equipment, and in particular to a portable dust generating device. Background Technology

[0002] To ensure the accuracy of particulate matter testing equipment, it is necessary to test or calibrate the equipment. Therefore, a dust generator capable of producing a stable, uniform, and continuous aerosol dust environment is required, enabling the particulate matter equipment to complete testing in a short time. Traditional dust generators primarily utilize mechanical components such as conveyor belts, chains, and rotating brushes to disperse and carry aerosol solid powder, delivering it to a mixing chamber. After thorough mixing in the mixing chamber, the dust enters the equipment under test and the standard equipment via sampling pipes.

[0003] Chinese patent application CN202320976158.7 discloses a standard material transfer device for an automatic monitoring equipment for ambient air particulate matter, comprising a mixing chamber, a dust generator, and a diversion device. The dust generator is connected to the air inlet of the mixing chamber, and a mixing honeycomb plate is installed inside the mixing chamber. The diversion device includes an airflow inlet, a diversion chamber, and at least three sampling ports, each of which is connected to a cutter assembly at its lower end. The airflow inlet is connected to the interior of the mixing chamber via a diversion pipe. In this design, the dust generated by the dust generator enters the mixing chamber and then enters the diversion device via the diversion pipe, thereby entering the device under test.

[0004] The existing dust generating devices have the following shortcomings: 1. Due to the large amount of dust inside the mixing chamber, it is impossible to stably generate low-concentration dust and zero gas, which makes it impossible to perform full-range calibration of the particulate matter sensor, resulting in a limited concentration range; 2. The mixing chamber lacks an effective dust removal structure, and residual dust will affect subsequent experiments; 3. It lacks a particle size classification module, and cannot generate a standard dust environment with specific particle sizes (such as PM1 / PM2.5 / PM10). Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a portable dust generator.

[0006] To solve the above-mentioned technical problems, this utility model includes a high-pressure air source, a dust generator, a mixing chamber, and a diversion device. The high-pressure air source is connected to the top of the mixing chamber through two diversion air paths, and the dust generator is located on one of the diversion air paths. An electrostatic gun is provided on the other diversion air path. The mixing chamber is equipped with a detachable screen frame and a dust storage box. The diversion device is equipped with a sampling port. The inlet of the diversion device is connected to the inside of the mixing chamber through a sampling tube, and one end of the sampling tube extending into the mixing chamber is located between the screen frame and the dust storage box. The sampling tube is connected to a calibration air path.

[0007] Preferably, the high-pressure gas source is connected to a gas processing unit, which is connected to two branch gas paths. A pressure gauge is installed on the branch gas path connected to the dust generator, and a flow meter is installed on the branch gas path connected to the electrostatic gun.

[0008] Preferably, the dust generator includes a particle flow generator, a rotating disk, and a feed hopper. The feed hopper is located above the rotating disk. The rotating disk is connected to the feed inlet of the particle flow generator. The splitting gas path is connected to the particle flow generator. The high-pressure gas in the splitting gas path generates negative pressure through the particle flow generator, and the dust adsorbed in the rotating disk enters the mixing chamber along with the high-pressure gas.

[0009] Preferably, the two split gas paths are connected at one end near the mixing chamber, and the split gas path connected to the dust generator is located at the rear end of the dust generator and is sequentially connected to a heater and a condenser.

[0010] Preferably, a mixing honeycomb plate is provided inside the mixing chamber below the sampling tube, and a variable frequency fan is provided below the mixing honeycomb plate.

[0011] Preferably, the mixing chamber has an exhaust port on the lower side wall of the variable frequency fan, and a filter element is connected to the exhaust port.

[0012] Preferably, the mixing chamber is made of a transparent material, and the inner wall of the mixing chamber is a polished mirror surface.

[0013] Preferably, the side wall of the mixing chamber is connected to a monitoring instrument, which includes one or more of a thermometer, a pressure gauge, or a hygrometer.

[0014] Preferably, the calibration gas path includes a zero gas path and a low-concentration gas path, which are respectively connected to the sampling tube. The zero gas path is equipped with a high-efficiency filter element, and the low-concentration gas path is equipped with a low-efficiency filter element. The zero gas path and the low-concentration gas path are combined and then connected to the anti-flocculent net.

[0015] Preferably, the sampling tube is provided with a first solenoid valve, and the zero gas path and the low concentration gas path are respectively provided with a second solenoid valve and a third solenoid valve at the ends near the sampling tube.

[0016] Preferably, a cutter is provided in the low-concentration gas path.

[0017] The beneficial effects of this invention are as follows: High-pressure air source blows the dust generated by the dust generator into the mixing chamber, and an electrostatic gun generates plasma wind to remove static electricity from the dust, improving the uniformity and stability of the dust particle size. A detachable screen frame is installed in the mixing chamber, allowing for screen replacement based on the required dust particle size, thus achieving adjustable dust particle size and creating a dust environment with specific particle sizes. Residual dust is collected by a dust collection box, allowing for timely removal of tested dust without affecting subsequent experiments. The calibration gas path on the sampling tube can generate dust across the entire concentration range, enabling detection calibration and meeting the detection needs of different concentration ranges. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is another structural schematic diagram of the present invention.

[0020] In the diagram: 1. High-pressure gas source; 2. Diverted gas path; 3. Mixing chamber; 4. Low-concentration gas path; 5. Zero-concentration gas path; 6. Diverter; 7. Controller; 8. Gas integrated processor; 9. Pressure gauge; 10. Flow meter; 11. Electrostatic gun; 12. Feed hopper; 13. Rotary disc; 14. Particle flow generator; 15. Heater; 16. Condenser; 17. Screen frame; 18. Monitoring instrument; 19. Mixing honeycomb panel; 20. Variable frequency fan; 21. Exhaust port; 22. Air filter; 23. Dust collection box; 24. Sampling tube; 25. First solenoid valve; 26. Third solenoid valve; 27. Second solenoid valve; 28. Anti-lint net; 29. ​​Weighing equipment; 30. Standard equipment; 31. Equipment to be tested; 32. Cutter; 33. Outer shell; 34. Shrink mask; 35. High-efficiency filter; 36. Low-efficiency filter; 37. Sampling port. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All directional indicators (such as up, down, left, right, front, back, etc.) in the present utility model are only used to explain the relative positional relationship and movement of each component in a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indicator will also change accordingly.

[0022] like Figure 1-2As shown, this embodiment provides a portable dust generator, including a high-pressure air source 1, a dust generator, a mixing chamber 3, and a diversion device 6. The high-pressure air source 1 is connected to a gas processing unit 8. The gas processing unit 8 pre-treats the compressed gas in the high-pressure air source 1 to generate clean and dry compressed air, ensuring the stability of the physical properties of the aerosol dust. In this embodiment, the gas processing unit 8 is a gas purifier. The gas processing unit 8 is connected to the top of the mixing chamber 3 through two diversion air paths 2. The dust generator is located on one of the diversion air paths 2, and an electrostatic gun 11 is installed on the other diversion air path 2. A pressure gauge 9 is installed on the diversion air path 2 connected to the dust generator, and a flow meter 10 is installed on the diversion air path 2 connected to the electrostatic gun 11. The airflow of the compressed gas carries the dust generated by the dust generator into the mixing chamber 3. At the same time, the compressed air passes through the electrostatic gun 11 to generate plasma wind, which is used to remove the static electricity of the dust particles and... The flow meter 10 adjusts the flow rate of the plasma air. The mixing chamber 3 is equipped with a detachable screen frame 17 and a dust collection box 23. The screen frame 17 is in sealed contact with the mixing chamber 3. The screen can be replaced according to the required particle size, achieving adjustable particle size and facilitating cleaning. The side wall of the dust collection box 23 is sealed to the inner wall of the mixing chamber 3. The dust collection box 23 can be connected to the mixing chamber 3 by pulling or disassembling, facilitating the timely removal of dust deposited at the bottom of the mixing chamber 3 to avoid affecting subsequent tests. Furthermore, the mixing chamber... The bottom of the 3 is located above the dust collection box 23 and is equipped with a shrink mask 34 for easy dust collection. The diversion device 6 is equipped with sampling ports 37. There are three sampling ports 37, which are respectively connected to the weighing device 29, the standard device 30 and the device to be tested 31. The inlet of the diversion device 6 is connected to the inside of the mixing chamber 3 through the sampling tube 24, and one end of the sampling tube 24 extending into the mixing chamber 3 is located between the screen frame 17 and the dust collection box 23. The sampling tube 24 is connected to the calibration air path.

[0023] The dust generator includes a particle flow generator 14, a rotating disk 13, and a feed hopper 12. The feed hopper 12 is located above the rotating disk 13. The rotating disk 13 is connected to the inlet of the particle flow generator 14. The splitting gas path 2 is connected to the particle flow generator 14. The high-pressure gas in the splitting gas path 2 generates negative pressure after passing through the particle flow generator 14. The dust adsorbed in the rotating disk 13 enters the mixing chamber 3 along with the high-pressure gas. The dust in the feed hopper 12 is added to the rotating disk 13. The rotation of the rotating disk 13 spreads the dust on it, forming a relatively uniform and thin material belt, providing a stable dust supply source. The rotating disk 13 is powered by a motor. The feeding method can refer to the rotary dust aerosol generator disclosed in patent application number CN201010136283.4. The working principle of the particle flow generator 14 is that when compressed air passes through the particle flow generator 14, a negative pressure is formed, which adsorbs the dust on the rotating disk 13 and enters the pipeline. The pressure gauge 9 is set at the front end of the particle flow generator 14 on the diversion air passage 2 to regulate the pressure of the compressed air entering the particle flow generator 14, thereby controlling the negative pressure intensity and flow rate of the particle flow generator 14. In addition, a valve is provided at the lower end of the dust feed hopper 12, and the amount of dust on the rotating disk 13 is controlled by adjusting the opening degree.

[0024] Furthermore, the lower end of the diversion air path 2 connected to the electrostatic gun 11 is connected to the lower end of the diversion air path 2 connected to the dust generator, so that the lower end of the diversion air path 2 connected to the dust generator becomes a separate path. The diversion air path 2 connected to the dust generator is located at the rear end of the dust generator and is sequentially connected to a heater 15 and a condenser 16. The heater 15 is used for heating and drying, and is used to fully evaporate the tiny water particles in the aerosol dust and dry the condensed water on the particle surface. The condenser 16 is used to further remove the tiny water particles.

[0025] Furthermore, the mixing chamber 3 is made of a transparent, anti-static, and anti-adsorption material. The transparent material of the mixing chamber 3 makes it easy to observe the dust generation inside, and the inner wall of the mixing chamber 3 is a polished mirror surface, which can reduce dust adsorption.

[0026] Furthermore, a mixing honeycomb plate 19 is provided inside the mixing chamber 3 below the sampling tube 24. The mixing honeycomb plate 19 is smooth and anti-adsorption, used for rectification, and increases the stability of airflow. A variable frequency fan 20 is provided below the mixing honeycomb plate 19. The variable frequency fan 20 generates turbulent airflow, which acts on the dust in the mixing chamber 3 through the mixing honeycomb plate 19, causing the dust to fluidize and boil, and increasing the uniformity of dust in the mixing chamber 3.

[0027] Furthermore, the mixing chamber 3 is provided with an exhaust port 21 on the side wall below the variable frequency fan 20. An air filter element 22 is connected to the exhaust port 21 to prevent dust in the mixing chamber from polluting the environment.

[0028] Furthermore, the side wall of the mixing chamber 3 is connected to a monitoring instrument 18, which includes one or more of a thermometer, a pressure gauge 9, or a hygrometer, for real-time monitoring of the internal environment of the mixing chamber 3.

[0029] Furthermore, the calibration gas path includes a zero gas path 5 and a low-concentration gas path 4, which are respectively connected to the sampling tube 24. The zero gas path 5 is equipped with a high-efficiency filter element 35, and the low-concentration gas path 4 is equipped with a low-efficiency filter element 36. After the zero gas path 5 and the low-concentration gas path 4 are combined, they are connected to the anti-fluffing net 28. The sampling tube 24 is equipped with a first solenoid valve 25. The zero gas path 5 and the low-concentration gas path 4 are respectively equipped with a second solenoid valve 27 and a third solenoid valve 26 at the end near the sampling tube 24. The low-concentration gas path 4 and the zero gas path 5 respectively generate low-concentration dust and a zero-gas environment to achieve full-concentration range calibration. The low-concentration gas path 4 is equipped with a cutter 32 to generate dust of a specific particle size.

[0030] It is worth noting that the entire structure of the portable dust generator is installed inside the outer casing 33. At the same time, a controller 7 is installed on the outer casing 33. The controller 7 is connected to the solenoid valve, flow meter 10, pressure gauge 9, frequency converter fan 20, monitoring instrument 18 and other components shown in this embodiment to realize closed-loop control. Of course, the controller 7 can also be connected to a touch screen for convenient control and adjustment.

[0031] In specific implementation, taking a standard dust environment that generates PM10 as an example, the screen in the screen frame 17 of the portable dust generator is selected as 1800 mesh, and the cutter 32 on the low-concentration gas path 4 is a PM10 cutter 32.

[0032] Zero point calibration: Close the first solenoid valve 25 and the third solenoid valve 26 on the sampling tube 24 and the low concentration gas path 4, and open the second solenoid valve 27 on the zero gas path 5. The ultra-clean air generated by the gas through the high efficiency filter element 35 enters the standard equipment 30, the device to be tested 31 and the weighing device 29.

[0033] Low concentration calibration: Close the first solenoid valve 25 and the second solenoid valve 27 on the sampling tube 24 and the zero gas path 5, and open the third solenoid valve 26 on the low concentration gas path 4. The gas enters the sampling tube 24 through the anti-corrosion net 28, the inefficient filter element 36, and the PM10 cutter 32, and then enters the standard device 30, the device to be tested 31, and the weighing device 29.

[0034] High-concentration calibration: High-pressure gas source 1 obtains clean and dry compressed air through gas integrated processor 8. The compressed air passes through particle flow generator 14, where dust is drawn in under negative pressure. The dust is neutralized by the plasma wind generated by electrostatic gun 11, and the static electricity is removed. After heating and condensation, it enters mixing chamber 3. Particles smaller than PM10 are screened out by the screen in screen frame 17 and enter mixing chamber 3. The gas is fluidized uniformly in mixing chamber 3 by the blowing of frequency converter fan 20. The gas in mixing chamber 3 is discharged through exhaust port 21 and air filter 22. The first solenoid valve 25 on sampling tube 24 is opened, and the third solenoid valve 26 and the second solenoid valve 27 on low-concentration gas path 4 and zero gas path are closed, so that the airflow enters the device to be tested 31, standard device 30 and weighing device 29 through sampling port 37 respectively.

[0035] This completes one full test. Then, open the dust collection box 23 and remove the dust.

[0036] For tests that do not require particle size classification, the screen frame 17 is hollow and does not have a filter in the middle, and the cutter 32 is not installed on the low concentration gas path 4.

[0037] Its working principle is as follows: the dust generated by the dust generator is blown into the mixing chamber 3 through the high-pressure air source 1, and plasma wind is generated by the electrostatic gun 11 to remove the static electricity in the dust and improve the uniformity and stability of the dust particle size. By setting a detachable screen frame 17 in the mixing chamber 3, the screen can be replaced according to the required dust particle size, so as to achieve adjustable dust particle size and thus achieve a dust environment with a specific particle size. The residual dust is collected by the dust collection box, and the dust after the test can be removed in time without affecting subsequent experiments. The calibration gas path on the sampling tube 24 can generate dust with a full concentration range to achieve detection calibration and meet the detection needs of different concentration ranges.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A portable dust generator, characterized in that, The system includes a high-pressure air source, a dust generator, a mixing chamber, and a distribution device. The high-pressure air source is connected to the top of the mixing chamber via two distribution air paths. The dust generator is located on one of the distribution air paths, and an electrostatic gun is installed on the other. The mixing chamber contains a detachable screen frame and a dust collection box. The distribution device has a sampling port, and its inlet is connected to the interior of the mixing chamber via a sampling tube. One end of the sampling tube extends into the mixing chamber and is located between the screen frame and the dust collection box. The sampling tube is connected to a calibration gas... The high-pressure gas source is connected to a gas processing unit, which is connected to two branch gas paths. A pressure gauge is installed on the branch gas path connected to the dust generator, and a flow meter is installed on the branch gas path connected to the electrostatic gun. The two branch gas paths are connected at their ends near the mixing chamber. The branch gas path connected to the dust generator is located at the rear end of the dust generator and is sequentially connected to a heater and a condenser. A mixing honeycomb plate is installed inside the mixing chamber below the sampling tube, and a variable frequency fan is installed below the mixing honeycomb plate.

2. The portable dust generator according to claim 1, characterized in that, The dust generator includes a particle flow generator, a rotating disk, and a feed hopper. The feed hopper is located above the rotating disk. The rotating disk is connected to the feed inlet of the particle flow generator. The split gas path is connected to the particle flow generator. The high-pressure gas in the split gas path generates negative pressure through the particle flow generator, adsorbing the dust in the rotating disk and entering the mixing chamber along with the high-pressure gas.

3. The portable dust generator according to claim 1, characterized in that, The mixing chamber is located on the lower side wall of the variable frequency fan and has an exhaust port, which is connected to a filter element.

4. A portable dust generator according to claim 1, characterized in that, The side wall of the mixing chamber is connected to monitoring instruments, which include one or more of a thermometer, a pressure gauge, or a hygrometer.

5. A portable dust generator according to claim 1, characterized in that, The calibration gas path includes a zero gas path and a low-concentration gas path, which are respectively connected to the sampling tube. The zero gas path is equipped with a high-efficiency filter element, and the low-concentration gas path is equipped with a low-efficiency filter element. The zero gas path and the low-concentration gas path are combined and then connected to the anti-fluffing net.

6. A portable dust generator according to claim 5, characterized in that, The sampling tube is equipped with a first solenoid valve, and the zero gas path and the low concentration gas path are respectively equipped with a second solenoid valve and a third solenoid valve at the end near the sampling tube.

7. A portable dust generator according to claim 6, characterized in that, A cutter is installed on the low-concentration gas line.

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