Aerosol detector calibration system based on multi-particle-size dust environment simulation

Abstract

The invention relates to an aerosol detector calibration system based on multi-particle-size dust environment simulation, which comprises an aerosol generation assembly, an aerosol screening assembly and an aerosol environment simulation cabin, and is characterized in that the aerosol screening assembly comprises a centrifugal classifier and a plurality of different-particle-size cutters; the feeding end of the centrifugal classifier is connected with the aerosol generating assembly, and the centrifugal classifier is used for screening aerosol atomization particles. Inlets of the particle size cutters are respectively connected with the centrifugal classifier, and the different particle size cutters are used for outputting aerosol atomized particles with different particle sizes; the particle size cutters are respectively communicated with the aerosol environment simulation bin, a test tube is arranged in the aerosol environment simulation bin, one end of the test tube is provided with a circulating fan, and the test tube is circumferentially communicated with a plurality of sampling tubes; the aerosol environment simulation bin is provided with an air supply port, and the air supply port is provided with an air supply valve for performing air supply dilution on aerosol atomized particles in the aerosol environment simulation bin based on the aerosol concentration in the test tube.

Description

Technical Field

[0001] This application belongs to the field of environmental monitoring technology, and specifically relates to a calibration system for an aerosol detector based on multi-particle-size dust environment simulation. Background Technology

[0002] Current aerosol detector calibration methods mostly employ static dust chambers or standard particulate generators, which suffer from low concentration control accuracy, uneven particulate distribution, and inability to dynamically simulate real dust environments. For example, Chinese invention patent CN114428042A discloses an online dust calibration system and method. This system includes a mist particulate generation module, a dilution module for diluting the mist particulates, a heating and drying module for heating and drying the diluted mist particulates, an aerosol distribution module with multiple aerosol interfaces that distribute dried dust aerosols to these interfaces, which are connected to the instrument being calibrated. A concentration measurement module measures the concentration of dust aerosols flowing into the aerosol distribution module, and a PID control module... The system controls the amount of dilution gas used by the dilution module to dilute the aerosol particles according to the data uploaded by the concentration measurement module, in order to obtain a dust aerosol of a set mass concentration. However, this calibration system has the following problems: First, due to the structure of its aerosol particle generation module, the system can only simulate aerosols of a single particle size in one calibration, which causes the simulated aerosol environment to be distorted, resulting in low accuracy of detection and calibration results. Second, the system directly distributes the diluted aerosol for calibration without considering that the particles in the aerosol are prone to uneven concentration due to sedimentation, which can cause calibration failure or inaccuracy. Summary of the Invention

[0003] Based on the aforementioned technical needs, this application provides an aerosol detector calibration system based on multi-particle-size dust environment simulation, which can improve the realism of dust testing and calibration simulation environment, and provide aerosol calibration instruments with a stable concentration change and high particulate motion activity to improve calibration accuracy and efficiency.

[0004] To achieve the above objectives, the technical solution of this application is as follows: A calibration system for an aerosol detector based on multi-particle-size dust environment simulation includes: an aerosol generating component for generating aerosol atomized particles; an aerosol screening component including a centrifugal separator and several different particle size cutters, wherein the inlet end of the centrifugal separator is connected to the outlet end of the aerosol generating component, and the centrifugal separator is used to screen out aerosol atomized particles that do not conform to the particle size range; the inlets of the several particle size cutters are respectively connected to the outlet end of the centrifugal separator, and different particle size cutters are used to output aerosol atomized particles of different sizes; aerosol... An aerosol environment simulation chamber is provided, with the outlets of several particle size cutters connected to the chamber. A test tube is suspended inside the chamber, with a circulation fan at one end. Several sampling tubes are connected circumferentially around the test tube, with one end of each sampling tube extending outward from the chamber. A gas inlet is located on one side of the chamber, equipped with a gas inlet valve. The gas inlet valve is used to replenish and dilute the aerosol atomized particles in the chamber based on the aerosol concentration in the test tubes.

[0005] Preferably, the plurality of particle size cutters include a TSP cutter, a PM10 cutter, and a PM2.5 cutter.

[0006] Preferably, the aerosol generating assembly includes an atomizing nozzle, an atomizing chamber, and a feed bottle. The atomizing nozzle is embedded in the atomizing chamber, one end of the atomizing nozzle is connected to an air supply pipe, and one end of the air supply pipe is connected to a high-pressure air source. A liquid supply pipe is provided inside the feed bottle, and the liquid supply pipe is connected to the air supply pipe. A baffle is provided in the atomizing chamber relative to the nozzle opening. An aerosol outlet is provided at the top of the atomizing chamber, and the aerosol outlet is connected to the feed inlet of the centrifugal separator.

[0007] Preferably, there are several baffles, which are arranged overlappingly along the axial direction of the atomizing nozzle. The surfaces of the baffles are densely arrayed with several guide holes, and the guide directions of the guide holes on the surfaces of adjacent baffles are staggered.

[0008] Preferably, the diameter of the guide holes on the different baffles gradually decreases in the direction away from the atomizing nozzle.

[0009] Preferably, the baffle is connected to a piezoelectric vibrator.

[0010] Preferably, the gas supply pipe is provided with an adsorption pipe section, which includes a symmetrically arranged convergent section and a diffuser section. The convergent section and the diffuser section are connected sequentially along the airflow direction of the gas supply pipe, and the liquid supply pipe is connected between the convergent section and the diffuser section.

[0011] Preferably, the feed bottle is equipped with an ultrasonic stirrer.

[0012] Preferably, a dryer is also provided between the outlet of the centrifugal separator and the inlet of the particle size cutter, the dryer being used to reduce the humidity of the aerosol atomized particles.

[0013] Preferably, a temperature control interlayer is provided on the outside of the atomization chamber, and a temperature control source is circulatedly connected to the temperature control interlayer. A temperature sensor is provided in the atomization chamber, and the temperature sensor is electrically connected to the temperature control source. The temperature control source is used to provide a temperature control medium to the temperature control interlayer based on the temperature data of the temperature sensor.

[0014] By adopting the above technical solution, compared with the prior art, this application has at least the following beneficial effects: Firstly, the aerosol particles generated by the aerosol generating component are centrifuged and separated by the centrifugal separator and cut by the particle size cutter, which can gradually reduce the size of the aerosol particles and make them tend to be evenly distributed. This avoids the large difference in aerosol particle size affecting the accuracy of the test, helps to provide a dust simulation environment with stable concentration changes, and improves the accuracy of dust test and calibration. Secondly, the aerosol environment simulation chamber simulates a more realistic dust suspension environment, overcoming the phenomenon of aerosol particles settling during the simulated test environment in existing technologies. Furthermore, the circulating flow improves the mixing degree of aerosol particles of various sizes, quickly forming a standard dust calibration environment. The air replenishment valve dilutes the test environment to rapidly change the aerosol concentration, simulating different levels of dust environments. This increases the comparison ratio of calibration experimental data for repeated testing and multiple calibrations, further improving calibration accuracy and efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the aerosol detector calibration system in the embodiment.

[0016] Figure 2 This is a partial schematic diagram A of the aerosol detector calibration system in the embodiment (from the attached diagram). Figure 1 ).

[0017] Figure 3 This is a partial enlarged view (B) of the aerosol generating component in the embodiment.

[0018] Figure 4 This is a partial schematic diagram C of the aerosol detector calibration system in the embodiment (from the attached diagram). Figure 1 ).

[0019] Figure 5 This is a partial schematic diagram (D) of the aerosol environment simulation chamber in the embodiment.

[0020] Figure 6 This is a partial cross-sectional view EE of the aerosol generating component in the embodiment.

[0021] Figure 7 The image shown is a magnified view F of the atomized part in the embodiment.

[0022] In the diagram: Aerosol generating assembly 10, atomizing nozzle 11, air supply pipe 111, adsorption section 112, convergence section 1121, diffusion section 1122, flow control valve 113, atomizing chamber 12, baffle 121, guide hole 1211, piezoelectric vibrator 1212, aerosol outlet 122, temperature control jacket 123, temperature control source 124, temperature sensor 125, feed bottle 13, liquid supply pipe 131, ultrasonic stirrer 132, return pipe 133 134. Peristaltic pump 14. High-pressure air source 15. Aerosol screening component 20. Centrifugal separator 21. Particle size cutter 22. Dryer 23. Diverter 24. Diverter valve 241. Aerosol environment simulation chamber 30. Test tube 31. Circulation fan 311. Sampling tube 312. Sampling probe 313. Motor 32. Air inlet 33. Air inlet valve 331. Discharge component 40. Exhaust pipe 41. Exhaust valve 411. Filter 42. Exhaust fan 43. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of this application will be further described below with reference to the accompanying drawings of the embodiments, and this application is not limited to the following specific implementation methods.

[0024] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "inner," "outer," "left," "right," "front," "rear," "top," and "bottom" indicate directions or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limitations on this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0025] The following is in conjunction with the appendix Figure 1 To be continued Figure 7 The present application will be further described in detail with reference to specific embodiments.

[0026] This application discloses an aerosol detector calibration system (hereinafter referred to as the "calibration system") based on multi-particle-size dust environment simulation. The system includes: an aerosol generating component 10 for generating aerosol atomized particles; an aerosol screening component 20, including a centrifugal separator 21 and several particle size cutters 22, the inlet of which is connected to the outlet of the aerosol generating component 10 for screening out aerosol atomized particles that do not conform to the particle size range, and outputting aerosol particles that conform to testing or instrument calibration; the inlets of the aforementioned particle size cutters 22 are respectively connected in parallel to the outlet of the centrifugal separator 21, allowing different particle sizes of aerosol atomized particles to be selected by the different particle size cutters 22; and an aerosol environment simulation chamber 30, the outlets of which are respectively connected to... The aerosol environment simulation chamber 30 is connected, and a simulation space is provided inside the aerosol environment simulation chamber 30. A test tube 31 is suspended in the simulation space. A circulation fan 311 is provided at one end of the test tube 31. Several sampling tubes 312 are arranged circumferentially on the outer surface of the test tube 31. The sampling tubes 312 are connected to the internal space of the test tube 31, and one end of the sampling tube 312 extends outward from the aerosol environment simulation chamber 30. This is used to insert the sampling probe 313 into the test tube 31 along the sampling tube 312 for sampling calibration, concentration detection and other operations. A gas replenishment port 33 is provided on one side of the aerosol environment simulation chamber 30. A gas replenishment valve 331 is provided at the gas replenishment port 33. The gas replenishment valve 331 is used to replenish and dilute the aerosol atomized particles in the aerosol environment simulation chamber 30 based on the aerosol concentration in the test tube 31.

[0027] Specifically, a motor 32 is installed on one side surface of the aerosol environment simulation chamber 30. The output shaft of the motor 32 is coaxially connected to the circulation fan 311 inside the test tube 31. The motor 32 is used to drive the circulation fan 311 to rotate. The centrifugal separator 21 can further centrifuge and separate the aerosol atomized particles output by the aerosol generating component 10 according to the set particle size range, and select atomized particles with smaller particle size and more uniform distribution for output. Several particle size cutters 22 are connected in parallel to the centrifugal separator 21 through a diversion pipe 24. The diversion pipe 24 is used to output the aerosol atomized particles selected by the centrifugal separator 21 through the main pipe, and then convey them to the particle size cutter 22 through each branch pipe. Each branch pipe is equipped with a diversion valve 241 before the inlet of the particle size cutter 22. The opening of each branch diversion valve 241 is used to control the flow rate and velocity of the atomized particles passing through the corresponding particle size cutter 22, thereby achieving the efficiency of controlling the atomized particles of each particle size range output by each particle size cutter 22.

[0028] The calibration process using the above-mentioned system is as follows: First, an aerosol atomized particle group is formed by the aerosol generating component 10. Then, the centrifugal sorter 21 selects atomized particles with smaller particle size and more uniform distribution. Next, the atomized particles are cut by particle cutters 22 of different sizes to output atomized particles of different sizes that meet the calibration standards. The standard atomized particles of different sizes are input into the aerosol environment simulation chamber 30. The circulating fan 311 rotates and agitates the aerosol particles in the aerosol environment simulation chamber 30, causing the aerosol particles in the aerosol environment simulation chamber 30 to continuously enter the lower end of the test tube 31 and exit from the upper end to form an airflow circulation. The aerosol particles of different sizes are mixed and flowed in a direction within the test tube 31 while overcoming the sedimentation effect, forming a relatively stable standard atomized particle. In a dust test environment, the sampling probes 313 of the standard aerosol tester and the aerosol tester to be calibrated are inserted into the sampling tube 312 to simultaneously detect and obtain at least two sets of data for comparison, thereby calibrating the aerosol tester. Based on the standard concentration data from the test, the gas supply valve 331 replenishes the aerosol environment simulation chamber 30 with corresponding gas, changing the aerosol concentration in the standard dust test environment within the test standard range. By diluting the aerosol particles, different concentrations of dust environments (dust environments can be divided into Level 1, Level 2, and Level 3 according to particulate matter concentration) are simulated for repeated testing and multiple calibrations, increasing the comparison ratio of calibration experimental data and helping to improve calibration accuracy.

[0029] Using the above calibration system has the following advantages: Firstly, the aerosol particles generated by the aerosol generating component 10 are centrifuged and cut by the particle size cutter 22, which can gradually reduce the size of the aerosol particles and make them tend to be evenly distributed. This avoids the large difference in aerosol particle size affecting the accuracy of the test, helps to provide a dust simulation environment with stable concentration changes, and improves the accuracy of dust test and calibration. Secondly, the aerosol environment simulation chamber 30 simulates a more realistic dust suspension environment, overcoming the phenomenon of aerosol particles settling during the simulated test environment in existing technologies. Furthermore, the circulating flow improves the mixing degree of aerosol particles of various sizes, quickly forming a standard dust calibration environment. The air replenishment valve 331 dilutes the test environment to rapidly change the aerosol concentration, simulating different levels of dust environments. This increases the comparison ratio of calibration experimental data for repeated testing and multiple calibrations, further improving calibration accuracy and efficiency.

[0030] Based on the above embodiments, this application also provides further embodiments to improve the above aerosol detector calibration system.

[0031] Preferably, in order to achieve the realism of the simulation of conventional dust environment and the accuracy of calibration, the aforementioned particle size cutters 22 include TSP cutters, PM10 cutters, and PM2.5 cutters, which are used to output particles of three main particle sizes for measuring particulate matter pollution in the air to the aerosol environment simulation chamber 30, thereby improving the complexity and realism of the calibration environment simulation.

[0032] When using the above system to simulate a single-size particulate environment or a complex mixed particulate environment, the operator only needs to open or close the diversion valve 241 in front of each particle size cutter 22 to allow single-size or multi-size particles to enter the aerosol environment simulation chamber 30.

[0033] In one embodiment, the aerosol generating assembly 10 includes an atomizing nozzle 11, an atomizing chamber 12, and a supply bottle 13. An insertion port is provided on one side of the atomizing chamber 12, into which the atomizing nozzle 11 is inserted, enabling the atomizing nozzle 11 to spray a gas-liquid mixture onto the center of the space within the atomizing chamber 12. One end of the atomizing nozzle 11 is connected to a gas supply pipe 111, and one end of the gas supply pipe 111 is connected to a high-pressure gas source 14. The flow rate of the high-pressure gas output from the high-pressure gas source 14 is controlled by adjusting the flow control valve 113 on the gas supply pipe 111. A liquid supply pipe 131 is inserted into the supply bottle 13. One end of the liquid supply pipe 131 extends to the bottom of the supply bottle 13, and the other end is connected to the gas supply pipe 111 via a T-connector. When the high-pressure, high-speed gas flow passes through the gas supply pipe 111 towards the atomizing nozzle 11, a liquid is released from the liquid supply pipe 13. A negative pressure zone is formed at the upper end to draw out the solution stored in the feed bottle 13 and spray it out through the atomizing nozzle 11 with the airflow. A baffle 121 is provided in the atomizing chamber 12 at the nozzle opening of the atomizing nozzle 11. The collision of aerosol with the baffle 121 can further increase the crushing area and improve the atomization effect. An aerosol outlet 122 is provided at the top of the atomizing chamber 12. The aerosol outlet 122 is connected to the feed inlet of the centrifugal separator 21. Since the centrifugal separator 21 draws aerosol particles out of the atomizing chamber 12 through negative pressure, the aerosol particles in the atomizing chamber 12 are affected by the particle size. The atomized particles that are more fully crushed and smaller in size are more likely to be suspended in the upper layer of the atomizing chamber 12 so that they can be selected by the centrifugal separator 21 through the aerosol outlet 122. The droplets with larger particle size or insufficient crushing gradually settle to the bottom of the atomizing chamber 12 under the action of sedimentation.

[0034] Furthermore, to reduce solution consumption and waste, the supply bottle is connected to a return pipe 133, and a manifold is provided at the bottom of the atomization chamber 12. A return port is provided at the bottom of the manifold. The return port of the atomization chamber 12 and the outlet of the separated residual material of the centrifugal separator 21 are both connected to the return pipe 133. A peristaltic pump 134 is provided on the return pipe 133. The peristaltic pump 134 draws the solution that has not been fully atomized or centrifugally separated back into the supply bottle 13 to reduce solution waste. At the same time, it keeps the atomization space in the atomization chamber 12 in a large range so that the aerosol can be fully atomized.

[0035] Furthermore, in order to improve the atomization efficiency of the atomization chamber 12 and reduce the average particle size of the aerosol atomized particles, a number of baffles 121 are provided in the atomization chamber 12. The baffles 121 are arranged in an overlapping manner along the axial direction of the atomization nozzle 11, and each baffle 121 has a dense array of guide holes 1211 on its surface, and the guide directions of the guide holes 1211 on the surfaces of adjacent baffles 121 are staggered. Preferably, this embodiment employs a three-stage baffle 121. When the high-speed airflow carrying the solution exits the atomizing nozzle 11 and directly impacts the first-stage baffle 121, the first baffle 121 exerts the greatest impact on the solution, generating a relatively large number of fine atomized particles. Simultaneously, the first baffle 121 intercepts most droplets larger than the guide hole 1211, allowing some liquid columns still possessing significant momentum to be guided backward and deflected through the guide hole 1211, impacting the second-stage baffle 121 to generate even finer atomized particles. This process continues until the final baffle 121 fully dissipates the kinetic energy of the liquid column, atomizing it into atomized particles. The multi-stage baffle 121's layered interception enhances the atomization of high-energy liquid columns, increases atomization efficiency, and gradually reduces the particle size of the atomized particles, thus contributing to improved particle size uniformity. In a preferred embodiment, the diameter of the guide holes 1211 on different baffles 121 gradually decreases along the direction away from the atomizing nozzle 11. The decreasing diameter of the guide holes 1211 can increase the movement speed of the liquid column and the airflow, increase the pressure difference between the liquid column before and after passing through the guide holes 1211, and further improve the atomization effect.

[0036] Specifically, the internal space of the atomizing chamber 12 is cylindrical, and its axis is parallel to the axis of the atomizing nozzle 11. This helps to improve the uniformity of the distribution of atomized particles and reduce the dead angle of dispersion, so that atomized particles that meet the particle size can be sucked out by the centrifugal separator 21 in time. To further increase the degree of particle breakage, the guide hole 1211 can be set as an irregular shape, preferably hexagonal, which can improve the cutting effect. The side surface of the baffle 121 that receives the liquid column can also be arrayed with a number of concave and convex points, which can generate a number of local turbulences on the wall of the baffle 121, increase the centrifugal force of small particles, make the small particles more evenly distributed, and at the same time prolong the residence time of large particles, which facilitates the settling of large particles.

[0037] Furthermore, to prevent the guide hole 1211 from becoming clogged during long-term atomization and affecting the atomization effect, a piezoelectric vibrator 1212 is integrated at the connection between the baffle 121 and the atomization chamber 12 or on the surface of the baffle 121. After the piezoelectric vibrator 1212 is energized, it vibrates the baffle 121 at high speed at a set frequency, reducing the risk of the guide hole 1211 becoming clogged.

[0038] In one specific embodiment, to improve the smoothness of liquid supply in the liquid supply pipe 131, an adsorption pipe section 112 is provided on the gas supply pipe 111 (the adsorption pipe section 112 can replace the ordinary tee connector used to connect the liquid supply pipe 131 and the gas supply pipe 111). The adsorption pipe section 112 includes a symmetrically arranged converging section 1121 and a diffuser section 1122. The inner diameter of the converging section 1121 gradually decreases along the axial direction, and the inner diameter of the diffuser section 1122 gradually increases along the axial direction. The converging section 1121 and the diffuser section 1122 are connected sequentially along the airflow direction of the gas supply pipe 111, and the upper end of the liquid supply pipe 131 is connected between the converging section 1121 and the diffuser section 1122.

[0039] When using the above calibration system, the high-speed airflow continuously forms a negative pressure zone after passing through the convergence section 1121 and the diffusion section 1122, thereby improving the flow of the adsorption solution. This allows the solution to be continuously drawn out of the supply bottle 13 via the supply pipe 131 and continuously atomized by the atomizing nozzle 11. Specifically, a flow control valve 113 is provided on the supply pipe 131. By controlling the liquid output, the atomization amount is controlled. By adjusting the flow control valves 113 of the supply pipe 131 and the air supply pipe 111, the atomization effect can be optimized, reducing solution waste.

[0040] Furthermore, an ultrasonic stirrer 132 is installed inside the feed bottle 13. Intermittently turning on the ultrasonic stirrer 132 can improve the solubility of the solution, reduce the content of insoluble matter, reduce the risk of clogging and wear of the atomizing nozzle 11, and help the crystallization rate of the atomized droplets to optimize the atomization effect.

[0041] In another embodiment, based on the structure of the above embodiment, the difference lies in that a dryer 23 is further provided between the outlet of the centrifugal separator 21 and the inlet of the particle size cutter 22. The dryer 23 is used to reduce the humidity of the aerosol atomized particles. Specifically, the dryer 23 can be selected by heating drying, electrostatic drying, or other methods, which can reduce the humidity of aerosol particles with lower energy consumption and faster drying rate. This helps to increase the dispersion uniformity of "dust particles" in the aerosol environment simulation chamber 30 and avoid particle agglomeration caused by excessive humidity.

[0042] In a more preferred embodiment, to further improve the atomization effect, a temperature-controlled interlayer 123 is provided outside the atomization chamber 12. The temperature-controlled interlayer 123 is cyclically connected to a temperature-controlled source 124. A temperature sensor 125 is provided inside the atomization chamber 12, and the temperature sensor 125 is electrically connected to the temperature-controlled source 124. During atomization, the temperature sensor 125 provides real-time feedback of the temperature value inside the atomization chamber 12 to the temperature-controlled source 124. When the temperature value is too low or too high, exceeding a certain set threshold, the temperature-controlled source 124 provides a temperature-controlled medium to the temperature-controlled interlayer 123 based on the temperature data signal, heating or cooling the atomization chamber 12 to maintain a suitable temperature. This prevents excessively high temperatures from causing premature evaporation of the atomized particles or excessively low temperatures from causing liquefaction of the atomized particles, which would severely affect the atomization effect. Specifically, the temperature control jacket 123 covers the periphery of the atomization chamber 12 and has a high thermal conductivity with the space inside the atomization chamber 12. The temperature control source 124 consists of a pump, a temperature control medium heating device, and a temperature control medium cooling device. The temperature control medium includes fluids such as water or air. The temperature control source 124 can heat or cool the temperature control medium to a set value based on the temperature of the atomization chamber 12 and circulate the temperature control medium into the temperature control jacket 123 through the pump to heat or cool the atomization chamber 12 and stabilize the temperature of the atomization chamber 12 to a range that is conducive to ensuring the atomization effect, such as 40°C to 60°C.

[0043] Furthermore, based on the above embodiments, the calibration system further includes an emission component 40, which includes an exhaust pipe 41, an exhaust valve 411, a filter 42, and an exhaust fan 43. The exhaust pipe 41 is connected to the interior of the aerosol environment simulation chamber 30, one end of the exhaust pipe 41 is connected to the inlet of the filter 42, the outlet of the filter 42 is connected to the inlet of the exhaust fan 43, and the exhaust valve 411 is located at one end of the exhaust pipe 41 adjacent to the aerosol environment simulation chamber 30.

[0044] After calibration is completed, open the exhaust valve 411 and start the exhaust fan 43 to discharge the aerosol. The aerosol passes through the filter 42 to remove harmful particles. Clean the aerosol environment simulation chamber 30 for recalibration.

[0045] By combining the various structures and features in the above embodiments, the corresponding functions of the above-mentioned aerosol detector calibration system are improved, enabling it to enhance the atomization effect of the dust solution, simulate a more realistic and stable dust testing environment for multi-particle-size dust, and help improve the calibration accuracy of the aerosol detector.

[0046] In addition, based on the above calibration system, this application also discloses a calibration method for an aerosol tester.

[0047] The method includes the following steps: S1. The dust-generating solution is fully atomized to form a group of aerosol atomized particles with uniform particle size; S2. Centrifuge the above aerosol atomized particle group to select atomized particles with smaller particle size, higher degree of breakage, and that meet the calibration standards, and output atomized particles with a particle size ≤100μm. S3. Cut the atomized particles output from the above steps into atomized particles with particle sizes that meet the TSP particle size index range, atomized particles with particle sizes that meet the PM10 particle size range, and atomized particles with particle sizes that meet the PM2.5 particle size index range. S4. Thoroughly mix the atomized particles of different particle size ranges mentioned above, and dilute them in stages to simulate dust environments with different particulate matter concentrations, and calibrate the aerosol detector.

[0048] This method has at least the following beneficial effects: It improves the uniformity of atomized particle size, enabling it to simulate a dust calibration environment with uniform particle dispersion and varying concentrations. This increases the number of comparative samples and the realism of the environment during the calibration process, thereby improving the calibration accuracy and efficiency of the aerosol detector calibration system.

[0049] Obviously, the above embodiments of this application are merely examples for clearly illustrating this application, and are not intended to limit the implementation of this application. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A calibration system for an aerosol detector based on multi-particle-size dust environment simulation, characterized in that, include: Aerosol generating components are used to generate aerosol atomized particles; An aerosol screening component includes a centrifugal separator and several different particle size cutters. The inlet of the centrifugal separator is connected to the outlet of the aerosol generating component. The centrifugal separator is used to screen out aerosol atomized particles that do not fit the particle size range. The inlets of the several particle size cutters are respectively connected to the outlet of the centrifugal separator. Different particle size cutters are used to output aerosol atomized particles of different sizes. as well as An aerosol environment simulation chamber is provided, with the outlets of several particle size cutters connected to the chamber. A test tube is suspended inside the chamber, with a circulation fan at one end. Several sampling tubes are connected circumferentially around the test tube, with one end of each sampling tube extending outward from the chamber. A gas inlet is located on one side of the chamber, equipped with a gas inlet valve. The gas inlet valve is used to replenish and dilute the aerosol atomized particles in the chamber based on the aerosol concentration in the test tubes.

2. The aerosol detector calibration system as described in claim 1, characterized in that, Some of the particle size cutters include TSP cutters, PM10 cutters, and PM2.5 cutters.

3. The aerosol detector calibration system as described in claim 1, characterized in that, The aerosol generating assembly includes an atomizing nozzle, an atomizing chamber, and a feed bottle. The atomizing nozzle is embedded in the atomizing chamber. One end of the atomizing nozzle is connected to an air supply pipe, and the other end of the air supply pipe is connected to a high-pressure air source. A liquid supply pipe is provided inside the feed bottle, and the liquid supply pipe is connected to the air supply pipe. A baffle is provided in the atomizing chamber relative to the nozzle opening. An aerosol outlet is provided at the top of the atomizing chamber, and the aerosol outlet is connected to the feed inlet of the centrifugal separator.

4. The aerosol detector calibration system as described in claim 3, characterized in that, The number of baffles is several, and the baffles are arranged overlappingly along the axial direction of the atomizing nozzle. The surfaces of the baffles are densely arrayed with several guide holes, and the guide directions of the guide holes on the surfaces of adjacent baffles are staggered.

5. The aerosol detector calibration system as described in claim 4, characterized in that, The diameter of the guide holes on the different baffles gradually decreases in the direction away from the atomizing nozzle.

6. The aerosol detector calibration system as described in claim 5, characterized in that, The baffle is connected to a piezoelectric vibrator.

7. The aerosol detector calibration system as described in claim 3, characterized in that, An adsorption section is provided on the gas supply pipe. The adsorption section includes a symmetrically arranged convergent section and a diffuser section. The convergent section and the diffuser section are connected sequentially along the airflow direction of the gas supply pipe, and the liquid supply pipe is connected between the convergent section and the diffuser section.

8. The aerosol detector calibration system as described in claim 3, characterized in that, An ultrasonic stirrer is installed inside the feed bottle.

9. The aerosol detector calibration system according to any one of claims 1 to 8, characterized in that, A dryer is also provided between the outlet of the centrifugal separator and the inlet of the particle size cutter, the dryer being used to reduce the humidity of the aerosol atomized particles.

10. The aerosol detector calibration system as described in claim 1, characterized in that, A temperature-controlled interlayer is provided on the outside of the atomization chamber. A temperature control source is circulatedly connected to the temperature-controlled interlayer. A temperature sensor is provided in the atomization chamber. The temperature sensor is electrically connected to the temperature control source. The temperature control source is used to provide a temperature-controlled medium to the temperature-controlled interlayer based on the temperature data of the temperature sensor.

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