CN114923828A - Sampler collection efficiency evaluation device and method based on static box method - Google Patents

Abstract

The invention discloses a sampler collection efficiency evaluation device and evaluation method based on a static box method. The sampler collection efficiency evaluation device based on the static box method includes a plurality of atomized aerosol generators; a mixing chamber connected with the atomized aerosol generators, and the mixing chamber is connected to the dilution gas source; Connected test chamber, the interior of the test chamber is detachably installed with the tested sampler and the reference pipeline; the analysis chamber, the analysis chamber is provided with an aerosol diluter and aerosol particle size spectrometer, the tested sampler and the reference pipeline Both are communicated with the input end of the aerosol diluter. The sampler collection efficiency evaluation device based on the static box method is suitable for evaluating the collection efficiency of various types of samplers; it can generate aerosols of various particle sizes, more realistically simulate the particle concentration in the atmospheric environment, and reduce the The error between the laboratory detection effect and the actual atmospheric environment improves the reliability of the evaluation result of the sampling efficiency of the sampler.

Description

Evaluation device and evaluation method of sampler collection efficiency based on static box method

technical field

The invention relates to the technical field of sampler collection efficiency evaluation, in particular to a sampler collection efficiency evaluation device and evaluation method based on a static box method.

Background technique

Aerosol is a gas dispersion system formed by suspending solid or liquid particles in a gas. Bioaerosol refers to the totality of biological particles and gaseous media including pollen, bacteria, fungi and viruses suspended in a gas. These particles are of different sizes. From viruses less than 0.1 microns in diameter to fungal spores 100 microns or more in diameter, they can occur as single unattached organisms or as aggregates. Bioaerosols can bring pathogenic microorganisms into the human body through breathing, causing health hazards. This year, public health safety has attracted more and more attention from the society. For public environments (such as stations, airports, and communities where people are densely populated), microorganisms in aerosols are the main culprit in spreading viruses and causing health problems. How to effectively collect aerosols It is one of the key issues in the field of public health research to fully understand the concentration and species of microorganisms in China.

In order to observe aerosols in the air, they need to be sampled. Aerosol samplers can be divided into two categories: environmental monitoring and biosafety according to different fields of use. Among them, samplers in the field of environmental monitoring include front-end cutters of dust concentration measuring instruments, respirable dust sampling heads and multi-stage impactors. Samplers in the field of biosafety include solid impact, liquid impact, membrane sampling and electrostatic samplers. With the promotion and use of aerosol samplers, the specification and unification of its technical parameters, as well as the calibration and traceability of various indicators have become more and more important. The physical efficiency of the sampler is an important indicator to evaluate its sampling effectiveness, and it is also Domestic equipment stuck neck problem.

The existing sampler collection efficiency evaluation device usually only allows monodisperse standard substances to enter the detector alone, and the real atmospheric environment usually has particles of various sizes and shapes, so that the gas collected by the sampler collection efficiency evaluation device cannot be collected. Simulating the real atmospheric environment reduces the reliability of the evaluation results of the sampling efficiency of the sampler.

Therefore, how to improve the reliability of the evaluation result of the sampling efficiency of the sampler is a technical problem that needs to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a sampler collection efficiency evaluation device, so as to improve the reliability of the sampler collection efficiency evaluation result.

In order to achieve the above object, the present invention provides the following technical solutions:

A sampler collection efficiency evaluation device based on a static box method, comprising:

a plurality of atomized aerosol generators that can be communicated with the generating air source, so that monodisperse particle solutions of different particle sizes are respectively loaded into the plurality of atomized aerosol generators;

a mixing chamber connected with the output end of the atomized aerosol generator, and the input end of the mixing chamber can be connected to the dilution gas source;

a test chamber in communication with the output end of the mixing chamber, and a sampler to be tested and a reference pipeline are detachably installed in the interior of the test chamber;

The analysis cabin is provided with an aerosol diluter and an aerosol particle size spectrometer, the measured sampler and the reference pipeline are both communicated with the input end of the aerosol diluter, and the A first solenoid valve is arranged between the test sampler and the aerosol diluter, and a second solenoid valve is arranged between the reference pipeline and the aerosol diluter.

Preferably, in the above-mentioned device for evaluating the collection efficiency of the sampler based on the static box method, a control cabin is further included;

The control cabin is provided with a first mass flow controller and a second mass flow controller, the first mass flow controller can communicate with the generated gas source, and the second mass flow controller can communicate with the dilution. The air source is connected, the output end of the first mass flow controller is communicated with the input end of the atomizing aerosol generator, and the output end of the second mass flow controller is communicated with the mixing chamber.

Preferably, in the above-mentioned device for evaluating the collection efficiency of the sampler based on the static box method, a multi-port valve is further provided in the control cabin, and the multi-port valve is provided on the first mass flow controller and the atomizer. between aerosol generators.

Preferably, in the above-mentioned device for evaluating the sampling efficiency of the sampler based on the static box method, a third mass flow controller is further provided in the control cabin, and the device for evaluating the sampling efficiency of the sampler further includes an air pump, and the third One end of the mass flow controller is communicated with the upstream pipeline of the aerosol diluter, and the other end of the third mass flow controller is communicated with the air pump.

Preferably, in the above-mentioned sampler collection efficiency evaluation device based on the static box method, the control cabin is further provided with a control panel, the first mass flow controller, the second mass flow controller, the multi-pass The valve, the third mass flow controller and the aerosol particle size spectrometer are all electrically connected to the control panel.

Preferably, in the above-mentioned sampler collection efficiency evaluation device based on the static box method, the sampler collection efficiency evaluation device further includes an air source device, and the output ends of the air source device are respectively connected with the atomized aerosol generator. communicate with the mixing chamber.

Preferably, in the above-mentioned device for evaluating the collection efficiency of the sampler based on the static box method, the atomized aerosol generator is composed of a thin tube with a venturi effect and a siphon effect.

Preferably, in the above-mentioned device for evaluating the collection efficiency of the sampler based on the static box method, the mixing chamber adopts a Venturi structure that can improve the uniformity of the aerosol.

Preferably, in the sampler collection efficiency evaluation device based on the static box method, the sampler under test is a PM2.5 cutter.

A method for evaluating the collection efficiency of a sampler, using the device for evaluating the collection efficiency of a sampler based on the static box method described in any one of the above, comprising the steps of:

S1: Load the monodisperse particle solutions of different particle sizes into multiple atomized aerosol generators respectively;

S2: Conducting one of the multiple atomized aerosol generators with the generating air source to generate aerosols with a preset particle size, and making the aerosol enter the mixing chamber, and at the same time, make the mixing chamber and the dilution chamber The air source is turned on to dilute the aerosol in the mixing chamber;

S3: The aerosol particles in the mixing chamber enter the test chamber, close the first solenoid valve, and open the second solenoid valve, so that the aerosol in the test chamber enters the aerosol diluter through the reference pipeline, and passes through the aerosol particle size. The spectrometer performs the initial detection of the particle concentration in the test chamber;

S4: close the second solenoid valve and open the first solenoid valve, so that the aerosol collected by the sampler to be tested enters the aerosol diluter, and the particle concentration is detected for the second time by the aerosol particle size spectrometer;

S5: Repeat steps S2 to S4 until all the atomized aerosol generators have generated aerosol particles of preset particle size.

Preferably, in the above-mentioned method for evaluating the collection efficiency of the sampler, the step S2 includes:

S2-1: control the airflow velocity of the aerosol generated by the atomized aerosol generator into the mixing chamber through the first mass flow controller;

S2-1: Control the airflow rate of the dilution gas source entering the mixing chamber through the second mass flow controller.

Preferably, in the above-mentioned method for evaluating the collection efficiency of the sampler, the step S2 further comprises:

S2-A1: Open one of the passages in the multi-way valve, so that one of the multiple atomized aerosol generators is connected to the generated gas source.

Preferably, in the above-mentioned method for evaluating the collection efficiency of the sampler, before the steps S3 and S4 are performed, the suction flow of the suction pump is controlled by a third mass flow controller.

When using the sampler collection efficiency evaluation device based on the static box method provided by the present invention, since the atomized aerosol generator can be connected with the generated air source, and the output end of the atomized aerosol generator is connected with the mixing chamber, Therefore, the aerosol can be generated by the atomized aerosol generator, and the generated aerosol can be input into the mixing chamber. Since the input end of the mixing chamber is also connected to the dilution gas source, the Entering the dilution air source can dilute the aerosol entering the mixing chamber. Since the test chamber is connected to the output end of the mixing chamber, the aerosol in the mixing chamber can enter the test chamber, so that the aerosol in the test chamber has High stability and uniformity; because the tested sampler and the reference pipeline are both connected to the input end of the aerosol diluter, and a first solenoid valve is set between the tested sampler and the aerosol diluter, the reference A second solenoid valve is arranged between the ratio pipeline and the aerosol diluter. Therefore, when evaluating the sampling efficiency of the sampler under test, first close the first solenoid valve and open the second solenoid valve, so that the The aerosol enters the aerosol diluter through the reference pipeline, and the particle concentration in the test chamber is initially detected by the aerosol particle size spectrometer to detect the original aerosol concentration and particle size distribution in the test chamber; Solenoid valve, open the first solenoid valve, the aerosol collected by the tested sampler enters the aerosol diluter in the analysis chamber, and the particle concentration is detected by the aerosol particle size spectrometer for the second time. By comparing the two measurement structures , record and judge the collection efficiency of the sampler under test. It can be seen that the sampler collection efficiency evaluation device based on the static box method provided by the present invention can generate a stable aerosol environment. When evaluating a sampler (such as a dust sampler, planktonic bacteria sampler, or biological sampler, etc.), it is only necessary to replace the sampler under test with a corresponding type of sampler, that is, the sampler collection efficiency evaluation device is suitable for Various types of samplers are used to evaluate the collection efficiency; and, since the number of atomized aerosol generators is multiple, multiple atomized aerosol generators can generate aerosols with different particle sizes, and achieve multiple All kinds of monodisperse aerosol particles enter the test chamber separately to complete the evaluation of the collection efficiency of aerosol particles of different particle sizes by the sampler. The sol particles are closer to the actual atmospheric environment, simulate the particle concentration in the atmospheric environment more realistically, reduce the error between the laboratory detection effect and the actual atmospheric environment, and improve the reliability of the evaluation results of the sampling efficiency of the sampler.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic structural diagram of a sampler collection efficiency evaluation device according to an embodiment of the present invention;

2 is a schematic diagram of the internal structure of a control cabin provided by an embodiment of the present invention;

3 is a schematic structural diagram of a sampler collection efficiency evaluation device provided by an embodiment of the present invention when a single particle size aerosol is generated;

FIG. 4 is a schematic structural diagram of setting ten atomized aerosol generators in a sampler collection efficiency evaluation device provided by an embodiment of the present invention;

5 is a schematic diagram of the external structure of a sampler collection efficiency evaluation device provided by an embodiment of the present invention;

FIG. 6 is a schematic flowchart of a method for evaluating the collection efficiency of a sampler according to an embodiment of the present invention.

Wherein, 100 is the atomizing aerosol generator, 101 is the first atomizing aerosol generator, 102 is the second atomizing aerosol generator, 103 is the third atomizing aerosol generator, and 104 is the fourth atomizing aerosol generator Aerosol generator, 105 is the fifth atomizing aerosol generator, 106 is the sixth atomizing aerosol generator, 107 is the seventh atomizing aerosol generator, 108 is the eighth atomizing aerosol generator, 109 is the ninth atomizing aerosol generator, 110 is the tenth atomizing aerosol generator, 200 is the mixing chamber, 300 is the test chamber, 301 is the sampler under test, 302 is the reference pipeline, and 400 is the analysis chamber , 401 is the aerosol diluter, 402 is the aerosol particle size spectrometer, 403 is the first solenoid valve, 404 is the second solenoid valve, 500 is the control cabin, 501 is the first mass flow controller, 502 is the second mass flow controller Flow controller, 503 is a multi-port valve, 504 is a third mass flow controller, 505 is a control panel, 600 is an air pump, and 700 is an air source device.

Detailed ways

In view of this, the core of the present invention is to provide a sampler collection efficiency evaluation device based on the static box method, so as to improve the reliability of the sampler collection efficiency evaluation result.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIGS. 1 to 6 , an embodiment of the present invention discloses a sampler collection efficiency evaluation device based on a static box method, including an atomized aerosol generator 100 , a mixing chamber 200 , a test chamber 300 and an analysis chamber 400 .

The number of atomizing aerosol generators 100 is multiple, so that monodisperse particles of different particle sizes (in the embodiment of the present invention, monodisperse standard poly styrene particles), and the atomized aerosol generators 100 can all be connected to the generated air source, so as to generate aerosols of different particle sizes through multiple atomized aerosol generators 100, so as to realize the monodispersity and multiplicity of aerosols. Dispersibility; the mixing chamber 200 is connected with the output end of the atomizing aerosol generator 100, and the input end of the mixing chamber 200 can be connected with the dilution gas source; the test chamber 300 is connected with the output end of the mixing chamber 200, and the test The interior of the bin 300 is detachably installed with the sampler under test 301 and the reference pipeline 302; the analysis chamber 400 is provided with an aerosol diluter 401 and an aerosol particle size spectrometer 402, and the sampler under test 301 and the reference pipeline 302 are both installed. It communicates with the input end of the aerosol diluter 401, and a first solenoid valve 403 is provided between the sampler 301 to be tested and the aerosol diluter 401, and a second solenoid valve 403 is provided between the reference pipeline 302 and the aerosol diluter 401. Solenoid valve 404 .

When using the sampler collection efficiency evaluation device based on the static box method provided by the present invention, since the atomized aerosol generator 100 can be connected to the generated gas source, and the output end of the atomized aerosol generator 100 is connected to the mixing chamber. 200 is connected, therefore, aerosol can be generated by the atomized aerosol generator 100, and the generated aerosol is input into the mixing chamber 200, because the input end of the mixing chamber 200 is also connected with the dilution gas source, therefore, through Passing the dilution air source into the mixing chamber 200 can dilute the aerosol entering the mixing chamber 200, so as to satisfy the multi-faceted and multi-dimensional flow control, and realize the control of the aerosol concentration. The output end is connected, therefore, the aerosol in the mixing chamber 200 can enter the test chamber 300, so that the aerosol in the test chamber 300 has high stability and uniformity; Both are communicated with the input end of the aerosol diluter 401, and a first solenoid valve 403 is provided between the sampler 301 to be tested and the aerosol diluter 401, and a first solenoid valve 403 is provided between the reference pipeline 302 and the aerosol diluter 401. Two solenoid valves 404. Therefore, when evaluating the collection efficiency of the sampler 301 under test, the first solenoid valve 403 is closed first, and the second solenoid valve 404 is opened, so that the aerosol in the test chamber 300 passes through the reference pipeline 302 Enter the aerosol diluter 401, and perform initial detection on the particle concentration in the test chamber 300 by the aerosol particle size spectrometer 402 to detect the original aerosol concentration and particle size distribution in the test chamber 300; then close the second solenoid valve 404 , open the first solenoid valve 403, the aerosol collected by the tested sampler 301 enters the aerosol diluter 401 in the analysis chamber 400, and the particle concentration is detected by the aerosol particle size spectrometer 402 for the second time. The secondary measurement structure is used to record and judge the acquisition efficiency of the sampler 301 under test. It can be seen that the sampler collection efficiency evaluation device based on the static box method provided by the present invention can generate a stable aerosol environment. When evaluating a type of sampler (such as a dust sampler, a planktonic bacteria sampler, or a biological sampler, etc.), it is only necessary to replace the sampler 301 under test with a corresponding type of sampler, that is, the sampler collection efficiency evaluation device. It is suitable for evaluating the collection efficiency of various types of samplers; and, since the number of atomized aerosol generators 100 is multiple, the multiple atomized aerosol generators 100 can generate samples of various particle sizes. Aerosol, realize that a variety of monodisperse aerosol particles enter the test chamber 300 separately, complete the sampling efficiency evaluation of aerosol particles of different particle sizes, or realize that mixed aerosol particles of any particle size enter the test chamber 300, The mixed aerosol particles in the test chamber 300 are closer to the actual atmospheric environment, and the particle concentration in the atmospheric environment is more realistically simulated, the error between the laboratory detection effect and the actual atmospheric environment is reduced, and the evaluation of the sampling efficiency of the sampler is improved. reliability of results.

It should be understood that the above-mentioned sampler 301 to be tested can be any one of a dust sampler, a planktonic bacteria sampler or a biological sampler. In practical applications, the type of the sampler can be adaptively changed according to actual needs. The sampler 301 under test provided by the embodiment of the invention is a PM2.5 cutter, so as to evaluate the cutting efficiency of the PM2.5 cutter.

In addition, the number of the above-mentioned atomized aerosol generators 100 is not specifically limited, as long as the number that can meet the use requirements falls within the protection scope of the present invention. Optionally, as shown in FIG. The number of the aerosol generators 100 is ten.

Further, the device for evaluating the collection efficiency of the sampler based on the static box method further includes a control cabin 500, and the control cabin 500 is provided with a first mass flow controller 501 and a second mass flow controller 502, and the first mass flow controller 501 The second mass flow controller 502 can be communicated with the dilution gas source, the output end of the first mass flow controller 501 is communicated with the input end of the atomized aerosol generator 100, and the second mass flow The output end of the controller 502 is communicated with the mixing chamber 200, so that the airflow rate of the aerosol generated by the atomized aerosol generator 100 entering the mixing chamber 200 is controlled by the first mass flow controller 501, and the second mass flow control is performed. The device 502 controls the airflow rate of the dilution air source entering the mixing chamber 200 , so that a stable aerosol environment is formed in the mixing chamber 200 .

In addition, a multi-port valve 503 is also provided in the control cabin 500, and the multi-port valve 503 is provided between the first mass flow controller 501 and the atomizing aerosol generator 100, so that the multi-port valve 503 can control multiple atomizations One or more of the aerosol generators 100 are connected to the generated gas source, and a variety of monodisperse standard polystyrene particles can be entered into the test chamber 300 through their respective pipelines through the control panel 505 described below, or they can be Through the control of the multi-port valve 503, the mixed aerosol emission of standard polystyrene particles of any size is realized, which not only meets the evaluation of monodisperse particle size, but also realizes the evaluation requirements of polydisperse particle size, and improves the diversity and scientificity of evaluation methods.

It should be understood that the above-mentioned multi-way valve 503 can be any type such as a four-way valve, an eight-way valve or a ten-way valve, as long as it is a type that can meet the requirements of use, it falls within the protection scope of the present invention; The provided multi-port valve 503 is a ten-port valve.

As shown in FIG. 2 , a third mass flow controller 504 is also arranged in the control cabin 500 , the sampler collection efficiency evaluation device further includes an air pump 600 , one end of the third mass flow controller 504 is connected to the aerosol diluter 401 The upstream pipeline is connected, and the other end of the third mass flow controller 504 is connected with the air pump 600, so as to control the air pump 600 to pump the upstream pipeline of the aerosol diluter 401, and the third mass flow controller 504 controls The suction flow rate is such that the sum of the suction flow rate of the suction pump 600 and the suction flow rate of the aerosol particle size spectrometer 402 meets the working flow requirements of the sampler 301 under test.

The upstream pipeline of the aerosol diluter 401 described herein refers to the pipeline that flows through the aerosol diluter 401 first.

Furthermore, the control cabin 500 is also provided with a control panel 505, the first mass flow controller 501, the second mass flow controller 502, the multi-port valve 503, the third mass flow controller 504 and the aerosol particle size spectrometer 402 are all provided. It is electrically connected to the control panel 505, so that the air flow rate of the first mass flow controller 501, the second mass flow controller 502 and the third mass flow controller 504 can be controlled through the control panel 505, and the opening and closing of the multi-port valve 503 can be controlled , and display the detection results of the aerosol particle size spectrometer 402 on the control panel 505, which is convenient for the staff to read the detection results. The aerosol particle size spectrometer 402 can realize the aerosol concentration, particle residue in the passage and particle size. Monitoring of three aspects of size distribution improves the ability to control aerosol concentration and particle size, as well as the ability to monitor the cleanliness of the pipeline, so as to achieve timely purging, improve detection efficiency and reduce errors.

At the same time, the above-mentioned control panel can display the running state of the sampler collection efficiency evaluation device and the analysis result of the aerosol particle size spectrometer 402 in real time, which realizes a visual operation mode and a monitoring mechanism for reporting errors in time, and automatically controls the multi-port valve 503 , the first mass flow controller 501 and the second mass flow controller 502, etc., realize the automation of the entire device, improve the controllability and accuracy of the entire device, improve the efficiency, and is convenient and quick.

It should be noted that the generated gas source and the dilution gas source can be the same gas source, or not the same gas source, as long as they can meet the usage requirements; and both the generated gas source and the dilution gas source can be compressed air or oxygen Any one of them, optionally, the generated gas source and the dilution gas source provided in the embodiment of the present invention are both generated by the gas source device 700, and the output end of the gas source device 700 is respectively mixed with the atomizing aerosol generator 100 and the aerosol generator 100. The homogenization chamber 200 is connected, so that a part of the gas source generated by the air source device 700 is passed into the atomizing aerosol generator 100 as a generated air source, and another part of the air source is passed into the mixing chamber 200 as a dilution air source.

The atomized aerosol generator 100 provided by the present invention is composed of thin tubes with Venturi effect and siphon effect, so as to adjust the generated concentration of the aerosol by controlling the size of the airflow.

In addition, the mixing chamber 200 adopts a venturi structure to improve the uniformity of the aerosol in the mixing chamber 200 .

In a specific embodiment of the present invention, taking PM2.5 cyclone efficiency evaluation as an example, the number of atomized aerosol generators 100 is ten, which are the first atomized aerosol generator 101 and the second atomized aerosol generator 101 respectively. The atomizing aerosol generator 102, the third atomizing aerosol generator 103, the fourth atomizing aerosol generator 104, the fifth atomizing aerosol generator 105, the sixth atomizing aerosol generator 106, the seventh atomizing aerosol generator The atomizing aerosol generator 107, the eighth atomizing aerosol generator 108, the ninth atomizing aerosol generator 109 and the tenth atomizing aerosol generator 110, in the first atomizing aerosol generator 101 to the Eight atomized aerosol generators 108 are respectively filled with 1.5±0.25 μm, 2.0±0.25 μm, 2.2±0.25 μm, 2.5±0.25 μm, 2.8±0.25 μm, 3.0±0.25 μm, 3.5±0.25 μm, 4.0±0.25 μm A solution of monodisperse standard polystyrene particles in μm. Then, the air source device 700 is communicated with the input end of the first mass flow controller 501, and the output end of the first mass flow controller 501 is communicated with the input end of the multi-port valve 503 (here, the ten-port valve), The output end of the multi-way valve 503 is communicated with the input end of the atomizing aerosol generator 100, and the output end of the atomizing aerosol generator 100 is communicated with the input end of the mixing chamber 200; the air source device 700 is connected with the second mass flow control The input end of the device 502 is communicated, and the output end of the second mass flow controller 502 is communicated with the input end of the mixing chamber 200 , and the aerosol generated by the atomizing aerosol generator 100 is diluted in the mixing chamber 200 .

Further, the mixing chamber 200 is communicated with the test chamber 300, and the tested sampler 301 and the reference pipeline 302 in the test chamber 300 are communicated with the aerosol diluter 401 through the first solenoid valve 403 and the second solenoid valve 404, respectively, The aerosol diluter 401 is communicated with the aerosol particle size spectrometer 402; the upstream pipeline of the aerosol diluter 401 is communicated with the input end of the third mass flow controller 504, and the output end of the third mass flow controller 504 is communicated with the The suction pump 600 is connected to adjust the suction flow so that the sum of the suction flow of the suction pump 600 and the aerosol particle size spectrometer 402 satisfies the working flow (16.7L/min) of the PM2.5 cutter.

During the initial detection, open the first passage of the multi-port valve 503 through the control panel 505, as shown in FIG. The second solenoid valve 404 is opened, the first solenoid valve 403 is closed, the test chamber 300 and the aerosol diluter 401 are connected through the reference pipeline 302, and the aerosol diluter 401 and the aerosol particle size spectrometer 402 in the analysis chamber 400 are respectively pneumatically diluted function and analysis function, and display the analysis results on the control panel 505 of the controller; then perform secondary detection, the first solenoid valve 403 in the analysis cabin 400 is opened, and the second solenoid valve 404 is closed, so that the analysis cabin 400 and PM2 .5 The cutter is connected, and the aerosol cut by the PM2.5 cutter enters the aerosol diluter 401 and the aerosol particle size spectrometer 402 in the analysis chamber 400, and the aerosol diluter 401 and the aerosol particle size spectrometer 402 are activated respectively Dilute and analyze, and display the analysis results on the control panel 505; by comparing the two measurement results, judge and record the cutting condition of the PM2.5 cutter, so far the measurement of the collection efficiency of the single-size sampler is completed, and the public pipeline is purged .

After completing the measurement of the collection efficiency of the sampler of a single size, the control panel 505 is used to close the passage to which the particles of the previous size belong, and turn on the passage to which the particles of the next size belong, so that the standard polystyrene particles of the corresponding size enter the mixing chamber 200 and the testing chamber 300. , the aerosol particle size spectrometer 402 in the analysis cabin 400 detects the particle concentration in turn according to the order of first measuring the reference pipeline 302 and then measuring the PM2.5 cutter, and the analysis result is displayed on the control panel 505; by comparing the two measurements As a result, the cutting conditions of the PM2.5 cutter were judged and recorded, and the collection efficiency measurement of another sampler of a single size was completed, and the common pipeline was purged; the above steps were repeated until all particle size passages experienced the steps of turning on and off, Thus, the evaluation of the cutting efficiency of PM2.5 cutters with different particle sizes is completed.

In addition, the present invention also discloses a sampler collection efficiency evaluation method, which applies the sampler collection efficiency evaluation device based on the static box method described in any one of the above, including the steps:

S1: Load the monodisperse particle solutions of different particle sizes into the multiple atomized aerosol generators 100 respectively, so as to realize the monodispersity and polydispersity of the aerosol.

S2: Connecting one of the multiple atomized aerosol generators 100 to the generating air source to generate an aerosol with a preset particle size, and allowing the aerosol to enter the mixing chamber 200, and at the same time, the mixing chamber 200 and the The dilution air source is turned on to dilute the aerosol in the mixing chamber 200, so as to detect the sampling efficiency of the sampler 301 under test for the aerosol of one of the preset particle sizes.

S3: The aerosol particles in the mixing chamber 200 enter the test chamber 300, the first solenoid valve 403 is closed, and the second solenoid valve 404 is opened, so that the aerosol in the test chamber 300 enters the aerosol diluter through the reference pipeline 302 401 , the particle concentration in the test chamber 300 is initially detected by the aerosol particle size spectrometer 402 , so as to detect the concentration and particle size distribution of the original aerosol in the test chamber 300 .

S4: Close the second solenoid valve 404 and open the first solenoid valve 403, so that the aerosol collected by the tested sampler 301 enters the aerosol diluter 401, and the particle concentration is measured by the aerosol particle size spectrometer 402 for the second time Detection is to facilitate the detection of the concentration and particle size distribution of the aerosol collected by the sampler 301 under test. After comparing the two measurement results, the collection efficiency of the sampler under test 301 is recorded and judged.

S5: Repeat steps S2 to S4 until all the atomized aerosol generators 100 have generated aerosol particles with preset particle sizes, so as to complete the collection efficiency evaluation of the tested samplers 301 with different particle sizes.

It can be seen that the method for evaluating the collection efficiency of the sampler provided by the present invention can generate a stable aerosol environment, and can generate a variety of aerosols with different particle sizes through a plurality of atomized aerosol generators 100 to achieve a variety of monodispersity. The aerosol particles of different sizes enter the test chamber 300 separately to complete the sampling efficiency evaluation of aerosol particles of different particle sizes by the sampler. The particles are closer to the actual atmospheric environment, more realistically simulate the particle concentration in the atmospheric environment, reduce the error between the laboratory detection effect and the actual atmospheric environment, and improve the reliability of the evaluation results of the sampling efficiency of the sampler.

It should be noted that, after the above step S4 is completed and before step S5 is started, that is, after the evaluation test for the collection efficiency of a single-size aerosol by the sampler is completed, the public pipeline needs to be purged through the air source to prevent the accuracy of subsequent detections from being affected. sex.

In addition, since the sampler 301 under test is detachably installed inside the test chamber 300, the above-mentioned evaluation method for the sampling efficiency of the sampler is a method for evaluating the sampling efficiency of the sampler based on the static box method, and the dust environment is relatively stable, which is suitable for dust samplers , planktonic bacteria sampler or biological sampler and other types of samplers. In practical applications, the types of samplers can be adaptively changed according to actual needs. Optionally, the sampler 301 under test provided in the embodiment of the present invention is: PM2.5 cutter to evaluate the cutting efficiency of PM2.5 cutter.

In addition, the number of the above-mentioned atomizing aerosol generators 100 is not specifically limited, as long as the number that can meet the use requirements falls within the protection scope of the present invention. The number is ten.

Further, the above step S2 includes:

S2-1: The first mass flow controller 501 controls the airflow rate of the aerosol in the atomized aerosol generator 100 entering the mixing chamber 200, so that the aerosol entering the mixing chamber 200 has a stable flow rate.

S2-1: The second mass flow controller 502 is used to control the airflow rate of the dilution gas source entering the mixing chamber 200 , so that a stable aerosol environment is formed in the mixing chamber 200 .

In addition, the above-mentioned step S2 also includes the steps before step S2-1:

S2-A1: Open one of the passages in the multi-way valve 503, so that one of the multiple atomizing aerosol generators 100 is connected to the generated gas source.

In addition, before performing steps S3 and S4 in the sampler collection efficiency evaluation method, the third mass flow controller 504 controls the suction flow of the suction pump 600, so that the suction flow of the suction pump 600 is related to the aerosol particle size spectrum. The sum of the pumping flow of the meter 402 meets the working flow requirement of the sampler 301 under test.

It should be understood that the above-mentioned step of pumping air through the air pump 600 can be located after steps S1 and/or S2, as long as it is before performing steps S3 and S4, the air flow rate of the air pump 600 and the aerosol particle size spectrometer 402 can be adjusted. The steps in which the sum of the pumping flow of the sampler 301 meets the working flow requirements of the tested sampler 301 all fall within the protection scope of the present invention.

The terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or elements is not provided with the listed steps or elements, but may include unlisted steps or elements.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (13)

1. a sampler collection efficiency evaluation device based on static box method, is characterized in that, comprises: a plurality of atomized aerosol generators that can be communicated with the generating air source, so that monodisperse particle solutions of different particle sizes are respectively loaded into the plurality of atomized aerosol generators; a mixing chamber connected with the output end of the atomized aerosol generator, and the input end of the mixing chamber can be connected to the dilution gas source; a test chamber in communication with the output end of the mixing chamber, and a sampler to be tested and a reference pipeline are detachably installed in the interior of the test chamber; The analysis cabin is provided with an aerosol diluter and an aerosol particle size spectrometer, the measured sampler and the reference pipeline are both communicated with the input end of the aerosol diluter, and the A first solenoid valve is arranged between the test sampler and the aerosol diluter, and a second solenoid valve is arranged between the reference pipeline and the aerosol diluter. 2. The sampler collection efficiency evaluation device based on the static box method according to claim 1, characterized in that, further comprising a control cabin; The control cabin is provided with a first mass flow controller and a second mass flow controller, the first mass flow controller can communicate with the generated gas source, and the second mass flow controller can communicate with the dilution. The air source is connected, the output end of the first mass flow controller is communicated with the input end of the atomizing aerosol generator, and the output end of the second mass flow controller is communicated with the mixing chamber. 3 . The sampler collection efficiency evaluation device based on the static box method according to claim 2 , wherein a multi-way valve is further arranged in the control cabin, and the multi-way valve is arranged at the first mass flow rate. 4 . between the controller and the atomizing aerosol generator. 4 . The sampler collection efficiency evaluation device based on the static box method according to claim 3 , wherein the control cabin is further provided with a third mass flow controller, and the sampler collection efficiency evaluation device further comprises: 5 . an air pump, one end of the third mass flow controller is communicated with the upstream pipeline of the aerosol diluter, and the other end of the third mass flow controller is communicated with the air pump. 5 . The sampler collection efficiency evaluation device based on the static box method according to claim 4 , wherein the control cabin is further provided with a control panel, the first mass flow controller, the second mass flow The controller, the multi-port valve, the third mass flow controller and the aerosol particle size spectrometer are all electrically connected to the control panel. 6 . The sampler collection efficiency evaluation device based on the static box method according to claim 2 , wherein the sampler collection efficiency evaluation device further comprises an air source device, the output ends of which are respectively connected to the The atomized aerosol generator is communicated with the mixing chamber. 7 . The sampler collection efficiency evaluation device based on the static box method according to claim 1 , wherein the atomized aerosol generator is composed of a thin tube with a venturi effect and a siphon effect. 8 . 8 . The sampler collection efficiency evaluation device based on the static box method according to claim 1 , wherein the mixing chamber adopts a Venturi structure that can improve aerosol uniformity. 9 . 9 . The sampler collection efficiency evaluation device based on the static box method according to claim 1 , wherein the tested sampler is a PM2.5 cutter. 10 . 10. A sampler collection efficiency evaluation method, characterized in that, applying the sampler collection efficiency evaluation device based on the static box method according to any one of claims 1 to 9, comprising the steps of: S1: Load the monodisperse particle solutions of different particle sizes into multiple atomized aerosol generators respectively; S2: Conducting one of the multiple atomized aerosol generators with the generating air source to generate aerosols with a preset particle size, and making the aerosol enter the mixing chamber, and at the same time, make the mixing chamber and the dilution chamber The air source is turned on to dilute the aerosol in the mixing chamber; S3: The aerosol particles in the mixing chamber enter the test chamber, close the first solenoid valve, and open the second solenoid valve, so that the aerosol in the test chamber enters the aerosol diluter through the reference pipeline, and passes through the aerosol particle size. The spectrometer performs the initial detection of the particle concentration in the test chamber; S4: close the second solenoid valve and open the first solenoid valve, so that the aerosol collected by the sampler to be tested enters the aerosol diluter, and the particle concentration is detected for the second time by the aerosol particle size spectrometer; S5: Repeat steps S2 to S4 until all the atomized aerosol generators have generated aerosol particles of preset particle size. 11. The sampler collection efficiency evaluation method according to claim 10, wherein the step S2 comprises: S2-1: control the airflow velocity of the aerosol generated by the atomized aerosol generator into the mixing chamber through the first mass flow controller; S2-1: Control the airflow rate of the dilution gas source entering the mixing chamber through the second mass flow controller. 12. The sampler collection efficiency evaluation method according to claim 11, wherein the step S2 further comprises: S2-A1: Open one of the passages in the multi-way valve, so that one of the multiple atomized aerosol generators is connected to the generated gas source. 13 . The method for evaluating the collection efficiency of a sampler according to claim 11 , wherein, before performing the steps S3 and S4 , a third mass flow controller is used to control the suction flow of the suction pump. 14 .

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