CN212622093U - Evaluation new coronavirus protective mask filtration efficiency's testing arrangement - Google Patents

Evaluation new coronavirus protective mask filtration efficiency's testing arrangement Download PDF

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CN212622093U
CN212622093U CN202020423250.7U CN202020423250U CN212622093U CN 212622093 U CN212622093 U CN 212622093U CN 202020423250 U CN202020423250 U CN 202020423250U CN 212622093 U CN212622093 U CN 212622093U
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mask
100nmpsl
box body
new coronavirus
pellets
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陈建民
孙剑峰
陈晖�
吴菂
隋国栋
王琳
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Fudan University
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Fudan University
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Abstract

The utility model belongs to the technical field of the virus protection, specifically be a new coronavirus protection mask filtration efficiency's of evaluation testing arrangement. The utility model discloses to the high infectivity of new coronavirus, on the basis of original N95 standard, add the standard that 100nm appraisal transmissivity is no longer than 100/min. Specifically, 100nm PSL pellets are used for simulating new coronavirus particles, and the filtration efficiency of the mask to be tested on 100nm new coronavirus is simultaneously evaluated by utilizing the number concentration of 100nmPSL pellets in a unit minute after filtration through the mask to be tested and the ratio of the number concentration of 100nmPSL pellets filtered through the mask to the number concentration of 100nmPSL pellets before filtration through the mask. The utility model comprises a box body, a mask clamp, a mask placing opening, a bell mouth-shaped gas transmission channel, a conductive rubber tube and a scanning mobility particle size spectrometer; the utility model discloses the authenticity of simulation is guaranteed on safe basis to the method, can effectively evaluate new crown virus protective facial mask's filtration efficiency.

Description

Evaluation new coronavirus protective mask filtration efficiency's testing arrangement
Technical Field
The utility model belongs to the technical field of the virus protection, concretely relates to evaluation new crown virus protective facial mask filtration efficiency's testing arrangement.
Background
In order to effectively promote the development and innovation of the protective mask for the new coronavirus, really know the filtering effect of the existing protective material on the new coronavirus, enhance the protective effect of residents on the new coronavirus and reduce the infection risk, a testing device for effectively evaluating the filtering efficiency of the protective mask for the new coronavirus is urgently needed.
Disclosure of Invention
An object of the utility model is to provide a convenient, safe, effectual evaluation new crown virus protective facial mask filtration efficiency's testing arrangement.
The utility model discloses to the high infectivity of new coronavirus, on the basis of original N95 standard, add 100nm particulate matter evaluation transmissivity and be no longer than 100/min's standard. The method comprises the following specific steps:
the particle diameter of the new coronavirus is about 100nm, so that 100nm PSL pellets are used for simulating new coronavirus particles, and the filtration efficiency of the mask to be tested on the 100nm new coronavirus is simultaneously evaluated by utilizing the number concentration of 100nmPSL pellets in a unit minute after the mask to be tested is filtered and the ratio of the number concentration of the 100nmPSL pellets filtered by the mask to the number concentration of 100nmPSL pellets before the mask is not filtered.
The utility model provides a testing arrangement for evaluating new corona virus protective facial mask filtration efficiency, include: the device comprises a box body, a mask clamp, a mask placing opening, a bell mouth-shaped gas transmission channel, a conductive rubber tube and a scanning electric mobility particle size spectrometer; wherein:
the box body is provided with a top cover and is used for inputting 100nmPSL pellets prepared by an aerosol generator; the mask placing opening is arranged on one side face of the box body and used for placing a mask to be tested and fixing the mask by using a mask clamp; one side of the box body is connected with the bell mouth-shaped gas transmission channel at the mouth of the mask placing opening through a boss with an annular groove, and the joint is fixed by a rubber ring; the bell-mouth-shaped gas transmission channel is connected with a scanning mobility particle size spectrometer outside the box body through a conductive rubber tube and is used for detecting the number concentration of 100nmPSL (measured electrode) small balls filtered by the mask to be detected; and an air guide port is arranged below the other side of the box body, is connected with another scanning electric mobility particle size spectrometer outside the box body through another conductive rubber tube and is used for detecting the number concentration of 100nmPSL (nanometer pulsed solid solution) beads which are not filtered by the mask to be detected.
The test flow of the device is as follows:
when the testing device is used for testing, the mask to be tested is placed at the mask placing opening and is fixed by the mask clamp (different mask clamps can be adopted when the sizes and the shapes of the masks are different); 100nmPSL pellets are prepared by an aerosol generator and are added into the box body from the top cover of the box body at a constant speed. After the device runs for two hours, the measurement and the recording of the number concentration of the 100nmPSL globules by the two scanning mobility particle size spectrometers are stopped simultaneously; the transmission rate of 100nmPSL beads is not more than 100/min as an evaluation standard:
firstly, exporting real-time measurement data of a scanning mobility particle size spectrometer for measuring the concentration of 100nmPSL pellets filtered by a virus protective mask to be measured, and comparing the 100nmPSL pellets to evaluate whether the transmittance meets the standard of not more than 100/min;
secondly, the real-time measurement data of the scanning mobility particle size spectrometer for measuring the concentration of the number of 100nmPSL small balls in the measurement box is compared with the corresponding data of the scanning mobility particle size spectrometer for measuring the concentration of the number of 100nmPSL small balls in the measurement box by making a difference between the real-time measurement data of the scanning mobility particle size spectrometer for measuring the concentration of the number of 100nmPSL small balls in the measurement box, and then the average value in the whole measurement time period is calculated, so that the filtering efficiency of the virus protection mask can be accurately known.
The air inflow of the scanning electromigration rate particle size spectrometer is controlled to be 0.4-0.8L/min (preferably 0.5L/min), the normal respiratory capacity of an ordinary person is 6-7.5L/min, the respiratory capacity of the ordinary person is calculated according to 7L/min, and the operation time of the testing device for 14min is equivalent to the respiratory capacity of the ordinary person for 1 min. Because the air inlet flow of the scanning mobility particle size spectrometer is small, and the number concentration of the added PSL pellets is high, the influence of the equipment for detecting the total concentration of 100nmPSL pellets in the box body, which is not filtered by the mask to be detected, can be ignored. The testing device can effectively evaluate whether the mask has the protective capability of filtering new coronavirus; tests show that if the number concentration of the 100nmPSL pellets is reduced, the mask has a filtering and protecting effect on new coronavirus, and the larger the reduction of the number concentration of the 100nmPSL pellets is, the better the virus filtering efficiency of the mask is.
The testing device and the method for effectively evaluating the filtering efficiency of the new coronavirus protective mask play a key guiding role in the selection of new coronavirus protective mask materials and the development of mask products.
The beneficial effects of the utility model reside in that:
(1) the 100nmPSL pellets are adopted to simulate new coronavirus particles, so that the simulation authenticity is ensured on the basis of safety, and the filtering efficiency of the new coronavirus protective mask can be effectively evaluated;
(2) aiming at the high infectivity of the new coronavirus, the standard that the evaluation transmittance of 100nm particles is not more than 100 per min is added on the basis of the existing N95/KN95 standard, so that the potential risk is reduced, and the method is more reliable and effective;
(3) the scanning mobility particle size spectrometer adopts an electrostatic classifier to measure the particle size of particles, and a condensed particle counter is used for measuring the number concentration of the particles, and the number concentration can be 1-108Performing concentration scanning within a range of several/cubic centimeter, and finishing particle size distribution scanning within a time not exceeding 60 s;
(4) scanning electric mobility particle size spectrum can provide the particulate matter particle size measurement within 3 ~ 1000nm scope, and applicable gauze mask filter effect's survey under the different virus particle size distributions of simulation in the future has supplemented the simplification of evaluation virus protection gauze mask filtration efficiency technique, is favorable to studying gauze mask filter effect under the different virus particle size distributions from many aspects, has further promoted the standardization of virus protection gauze mask, standardization.
Drawings
Fig. 1 is a schematic structural diagram of a testing device for evaluating the filtration efficiency of a new coronavirus protective mask.
Fig. 2 is a view showing a mask placement opening.
Figure 3 is a mask sample # 1 evaluated to simulate the effect of a new coronavirus on filtering 100nmPSL beads.
Fig. 4 is a sample mask # 2 evaluated to simulate the effect of new coronavirus filtering 100nmPSL beads.
Fig. 5 is a sample # 3 mask evaluated for its effect of simulating the filtration of 100nmPSL beads by new coronavirus.
Reference numbers in the figures: 1 is the box, 2 is the box top cap, 3 is the boss that has the annular groove, 4 is the gauze mask clamp, 5 places the mouth for the gauze mask, 6 is the rubber circle, 7 is horn mouth shape gas transmission channel, 8 is the conductive rubber pipe, 9 is scanning mobility particle size spectrometer SMPS-3938, 10 is the gas guide mouth, 11 is 100nmPSL bobbles.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Examples 1 to 3:
the protective mask (1 # sample, 2# sample and 3# sample) for the virus to be detected is placed at the mask placing opening (5) of the boss (3) with the annular groove, and the edge of the mask to be detected is tightly fixed by the mask clamp (4). The bell-mouth-shaped gas transmission channel (7) is sleeved on the boss (3) with the annular groove and is tightly clamped by the rubber ring (6) sleeved on the clamping groove on the boss (3) of the annular groove. One end of the conductive rubber tube (8) is connected with the bell-mouth-shaped gas transmission channel (7) and is connected with a SMPS-3938 (9) of a scanning mobility particle size spectrometer. One end of another conductive rubber tube (8) is connected with the air guide port (10) and is connected with another SMPS-3938 (9) of the scanning mobility particle size spectrometer. And (4) opening two scanning mobility particle size spectrometers SMPS-3938 and preheating for 5 min. After the equipment is stabilized, a top cover (2) of the box body is opened, 100nmPSL pellets prepared by an aerosol generator are added into the box body (1), the top cover (2) of the box body is closed rapidly, and timing is started after 2-3min (so that air which is not filtered by a mask in a bell-mouth-shaped gas transmission channel (7) is pumped out by a scanning mobility particle size spectrometer SMPS-3938 (9), and the reliability of test data is prevented from being influenced). After two hours, the two scanning mobility particle size spectrometers SMPS-3938 (9) were stopped simultaneously for the measurement and recording of the concentration of 100nmPSL beads. Firstly, exporting real-time measurement data of a scanning electromigration rate particle size spectrometer SMPS-3938 for measuring the number concentration of 100nmPSL pellets filtered by a virus protective mask to be measured, and comparing the 100nmPSL pellets to evaluate whether the transmittance meets the standard of not more than 100/min; secondly, the filtration efficiency of the virus protection mask can be accurately known by subtracting real-time measurement data of a scanning electromigration rate particle size spectrometer SMPS-3938 for measuring the number concentration of 100nmPSL globules in the measurement box from real-time measurement data of the scanning electromigration rate particle size spectrometer SMPS-3938 for measuring the number concentration of 100nmPSL globules filtered by the virus protection mask to be measured, and calculating the average value in the whole measurement time period compared with the corresponding data of the scanning electromigration rate particle size spectrometer SMPS-3938 for measuring the number concentration of 100nmPSL globules in the measurement box.
Mask sample # 1 was selected and evaluated for its ability to simulate the new coronavirus filtration of 100nmPSL beads as shown in FIG. 3: as shown in FIG. 3, the number concentration of 100nmPSL beads before filtration: 4590 #/cm3(ii) a Number concentration of 100nmPSL beads after filtration: 1010 #/cm3(ii) a Average filtration efficiency: 78.0 percent.
Mask sample # 2 was selected and evaluated to simulate the effect of a new coronavirus on filtering 100nmPSL beads as shown in FIG. 4: as shown in FIG. 4, the number concentration of 100nmPSL beads before filtration: 4596 #/cm3(ii) a Number concentration of 100nmPSL beads after filtration: 508 #/cm3(ii) a Average filtration efficiency: 88.9 percent.
Mask sample # 3 was selected and evaluated for its ability to simulate the effect of a new coronavirus filtering 100nmPSL pellet as shown in FIG. 5: as shown in FIG. 5, the number concentration of 100nmPSL beads before filtration: 4588 #/cm3(ii) a Number concentration of 100nmPSL beads after filtration: 38 #/cm3(ii) a Average filtration efficiency: 99.2 percent.

Claims (1)

1. The utility model provides an evaluation new coronavirus protective mask filtration efficiency's testing arrangement which characterized in that includes: the device comprises a box body, a mask clamp, a mask placing opening, a bell-mouth-shaped gas transmission channel, a conductive rubber tube, a scanning electric mobility particle size spectrometer and an aerosol generator for preparing 100nmPSL pellets; wherein,
the box body is provided with a top cover and is used for inputting 100nmPSL pellets prepared by an aerosol generator; the mask placing opening is arranged on one side face of the box body and used for placing a mask to be tested and fixing the mask by using a mask clamp; one side of the box body is connected with the bell mouth-shaped gas transmission channel at the mouth of the mask placing opening through a boss with an annular groove, and the joint is fixed by a rubber ring; the bell-mouth-shaped gas transmission channel is connected with a scanning mobility particle size spectrometer outside the box body through a conductive rubber tube and is used for detecting the number concentration of 100nmPSL (measured electrode) small balls filtered by the mask to be detected; and an air guide port is arranged below the other side of the box body, is connected with another scanning electric mobility particle size spectrometer outside the box body through another conductive rubber tube and is used for detecting the number concentration of 100nmPSL (nanometer pulsed solid solution) beads which are not filtered by the mask to be detected.
CN202020423250.7U 2020-03-29 2020-03-29 Evaluation new coronavirus protective mask filtration efficiency's testing arrangement Active CN212622093U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111272638A (en) * 2020-03-29 2020-06-12 复旦大学 Testing device and method for evaluating filtering efficiency of new coronavirus protective mask
CN113029912A (en) * 2021-04-12 2021-06-25 常熟迈得医疗器械技术服务有限公司 Bacterial virus filtration efficiency tester and operation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111272638A (en) * 2020-03-29 2020-06-12 复旦大学 Testing device and method for evaluating filtering efficiency of new coronavirus protective mask
CN111272638B (en) * 2020-03-29 2024-04-26 复旦大学 Testing device and method for evaluating filtering efficiency of novel coronavirus protective mask
CN113029912A (en) * 2021-04-12 2021-06-25 常熟迈得医疗器械技术服务有限公司 Bacterial virus filtration efficiency tester and operation method thereof
CN113029912B (en) * 2021-04-12 2023-03-14 常熟迈得医疗器械技术服务有限公司 Bacterial virus filtration efficiency tester and operation method thereof

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