CN220104799U

CN220104799U - Mask aerosol protective performance testing device

Info

Publication number: CN220104799U
Application number: CN202321356429.5U
Authority: CN
Inventors: 王翔
Original assignee: WUHAN INSTITUTE OF BIOLOGICAL PRODUCTS CO LTD
Current assignee: WUHAN INSTITUTE OF BIOLOGICAL PRODUCTS CO LTD
Priority date: 2023-05-26
Filing date: 2023-05-26
Publication date: 2023-11-28
Anticipated expiration: 2033-05-26

Abstract

The utility model relates to the technical field of daily necessities protection performance test, and provides a mask aerosol protection performance test device which comprises an aerosol generating mechanism, a test cabin, a respiration simulation mechanism and an in-cabin aerosol sampling mechanism; the test cabin is used for placing a mask test head die; the aerosol generating mechanism is communicated with the cabin and is used for conveying the aerosol into the cabin; the respiration simulation mechanism comprises a gas sampling tube, an inspiration assembly, an expiration assembly and a detector; the air suction component and the air exhaling component are connected with the head die through the air sampling tube, and the air suction component is used for extracting air in the mask; the cabin interior aerosol sampling mechanism is communicated with the cabin and is used for extracting aerosol gas in the cabin interior; the detector is connected with the air suction assembly and the cabin aerosol sampling mechanism and is used for detecting the concentration of aerosol in air suction and the concentration of aerosol in the cabin. The device not only can test the protection effect of the mask on the biological aerosol, but also can improve the test safety performance and avoid the leakage of the biological aerosol in the experimental process.

Description

Mask aerosol protective performance testing device

Technical Field

The utility model relates to the technical field of daily necessities protection performance test, in particular to a mask aerosol protection performance test device.

Background

Aerosol is one of the main ways of respiratory infectious disease transmission, and the mask plays an important role in protecting people from aerosol transmitted viruses and bacteria as an important protective article. Currently, most mask protection effect tests are performed by using particulate matters, such as smoke particles, sulfate particles and the like, and the testing method has great limitation and cannot completely simulate the complex properties of bioaerosols.

The mask biological aerosol protection effect testing device not only can be used for evaluating masks, but also can be used for researching aerosols and providing technical support for related fields, in the prior art, the existing mask tester generally uses an anderson sampling and colony culture counting method, and the protection effect of the masks is analyzed by detecting the concentration of the bacterial aerosols inside and outside the masks worn on the head mould. Because of the survival characteristics and the particle size difference of different biological aerosols, the protection effect of the mask on the aerosols can not be tested when the existing equipment can not test different pathogens. Considering the characteristic difference of different pathogenic microorganisms, the mask can truly reflect the protection effect of the mask under the actual condition by using epidemic pathogens for testing, but due to lack of biological safety protection devices, the existing mask testing devices are easy to leak harmful gases such as aerosol, and cause harm to experimental personnel and environment.

Therefore, how to improve the safety performance of the mask protective performance testing device and avoid the leakage of the biological aerosol in the experimental process is one of the technical problems to be solved in the current field.

Disclosure of Invention

Based on the expression, the utility model provides the mask aerosol protective performance testing device, so that the safety performance of the mask protective performance testing device is improved, and the leakage of the biological aerosol in the experimental process is avoided.

The technical scheme for solving the technical problems is as follows:

the utility model provides a mask aerosol protective performance testing device, which comprises: the device comprises an aerosol generating mechanism, a test cabin, a respiration simulation mechanism and an in-cabin aerosol sampling mechanism;

the test cabin is provided with a cabin for placing a mask test head die; the aerosol generating mechanism is communicated with the cabin and is used for conveying aerosol into the cabin to construct an aerosol environment;

the breath simulation mechanism comprises a gas sampling tube, an inhalation assembly, an exhalation assembly and a detector; the breathing component and the exhaling component are connected with the mask test head die through the gas sampling pipe, the breathing component is used for extracting gas in the mask, and the exhaling component is used for inputting gas into the mask;

the cabin aerosol sampling mechanism is communicated with the cabin and is used for extracting aerosol gas in the cabin;

the detector is connected with the air suction assembly and the in-cabin aerosol sampling mechanism and is used for detecting the concentration of aerosol in air suction and the concentration of aerosol in the cabin.

On the basis of the technical scheme, the utility model can be improved as follows.

Further, the aerosol generating mechanism includes: the device comprises a first air feeding pump, a first filter, an aerosol generator, an aerosol mixing cavity, an aerosol static neutralizer and an aerosol drying tube;

the air outlet of the first air supply pump is connected with the upstream end of the first filter, and the downstream end of the first filter is connected with the first air inlet of the aerosol mixing cavity;

the air outlet of the aerosol generator is connected with the second air inlet of the aerosol mixing cavity;

the air outlet of the aerosol mixing cavity is connected with the air inlet of the aerosol drying tube through the aerosol electrostatic neutralizer;

the air outlet of the aerosol drying tube is connected with an air inlet connected to the cabin.

Further, the cabin is also provided with a heater and a humidifier;

the heater is arranged at the top of the cabin; the humidifier is arranged on the side wall of the cabin.

Further, the cabin is also provided with a circulating fan; the circulation fan is provided on top of the cabin.

Furthermore, a pressure balance filter is further arranged on the side wall of the cabin and used for balancing the internal pressure and the external pressure of the cabin.

Further, the mask aerosol protective performance testing device also comprises a negative pressure safety cabinet;

the test cabin is arranged in the negative pressure safety cabinet;

the negative pressure safety cabinet is provided with an exhaust channel for exhausting waste gas generated by the test cabin.

Further, an ultraviolet disinfection lamp is arranged at the top of the negative pressure safety cabinet.

Further, the suction assembly includes: a first pump, a first flow meter, a second filter, and a first aerosol sampler;

the first air pump is connected with one end of the second filter through the first flowmeter, the other end of the second filter is connected with the first aerosol sampler, the first aerosol sampler is connected with the gas sampling tube, and the detector is used for detecting the concentration of aerosol gas collected in the first aerosol sampler.

Further, the cabin aerosol sampling mechanism comprises: a second air pump, a second flowmeter, a third filter and a second aerosol sampler;

the second air pump is connected with one end of the third filter through the second flowmeter, the other end of the third filter is connected with the second aerosol sampler, the second aerosol sampler is connected with the cabin, and the detector is used for detecting the concentration of aerosol gas collected in the second aerosol sampler.

Further, the exhalation assembly includes: a second air feed pump, a third flowmeter, and a fourth filter;

the second air supply pump is connected with one end of the fourth filter through the third flowmeter, and the other end of the fourth filter is connected with the gas sampling tube.

Compared with the prior art, the technical scheme of the utility model has the following beneficial technical effects:

according to the mask aerosol protection performance testing device, the aerosol generating mechanism, the testing cabin and the respiration simulation mechanism are arranged, the mask testing head die can be arranged in the cabin of the testing cabin, the aerosol generating mechanism can convey aerosol into the cabin to form an aerosol environment, further, the inhalation assembly and the exhalation assembly in the respiration simulation mechanism can simulate the inhalation and respiration process, the detector can detect the aerosol concentration in inhalation gas, in addition, the in-cabin aerosol sampling mechanism can collect gas in the cabin, the detector can detect the aerosol concentration in the cabin environment, the sampling time is ensured to be the same, and the protection effect of the mask on the biological aerosol is tested by detecting the difference of the aerosol concentration in the inhalation gas and the aerosol concentration in the cabin environment.

Compared with the prior art, the mask aerosol protection performance testing device is suitable for generating and sampling different biological aerosols such as bacteria, viruses and pollen, meets different testing requirements, is wide in application range, can integrate aerosol generation, uniform mixing, sampling and detection, can accurately simulate the protection effect of a mask on different pathogen biological aerosols in different biological aerosol pollution environments under the condition of guaranteeing biological safety, provides an effective evaluation platform for mask protection effect detection, is placed in a testing cabin in an expiration and inspiration process, is arranged in a barrier environment, improves the safety performance of the mask protection performance testing device, and avoids the leakage of the biological aerosols in an experiment process.

Drawings

Fig. 1 is a schematic diagram of the overall structure of a mask aerosol protection performance testing device according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of an aerosol generating mechanism according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a breath simulation mechanism and an in-cabin aerosol sampling mechanism according to an embodiment of the present utility model;

in the drawings, the list of components represented by the various numbers is as follows:

1. an aerosol generating mechanism;

11. a first air supply pump; 12. a first filter; 13. an aerosol generator; 14. an aerosol mixing chamber; 15. an aerosol electrostatic neutralizer; 16. an aerosol drying tube;

2. a test chamber;

21. a heater; 22. a humidifier; 23. a circulation fan; 24. a pressure balancing filter; 25. a temperature and humidity sensor;

3. a breath simulation mechanism;

31. a gas sampling tube;

32. a suction assembly; 321. a first air pump; 322. a first flowmeter; 323. a second filter; 324. a first aerosol sampler; 325. a first circulation switch; 326. a first three-way electromagnetic valve; 327. a fifth filter;

33. an exhalation assembly; 331. a second air supply pump; 332. a third flowmeter; 333. a fourth filter; 334. a second three-way electromagnetic valve; 335. a sixth filter; 336. a humidifying bottle;

4. an in-cabin aerosol sampling mechanism;

41. a second air pump; 42. a second flowmeter; 43. a third filter; 44. a second aerosol sampler; 45. a third cycle switch; 46. a third three-way electromagnetic valve; 47. a seventh filter;

5. mask test head mold;

6. a negative pressure safety cabinet; 61. ultraviolet sterilizing lamp.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Embodiments of the utility model are illustrated in the accompanying drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

In describing embodiments of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present utility model will be understood in detail by those of ordinary skill in the art.

Furthermore, the terms "first," second, "… …" and seventh are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present specification, the description with reference to the term "particular example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Embodiments of the present utility model will be described in further detail with reference to fig. 1 to 3 and examples, which are provided to illustrate the present utility model but not to limit the scope of the present utility model.

As shown in fig. 1, an embodiment of the present utility model provides a mask aerosol protection performance testing device, including: an aerosol generating mechanism 1, a test cabin 2, a respiration simulation mechanism 3 and an in-cabin aerosol sampling mechanism 4.

The test cabin 2 is provided with a cabin for placing a mask test head die 5; the aerosol generating means 1 communicates with the chamber for delivering aerosol into the chamber to build up an aerosol environment.

A sampling tube is arranged in the mask test head die 5, the front end of the sampling tube extends out from the lower part of the nose of the mask test head die, and the rear end of the sampling tube is connected with the respiration simulation mechanism 3.

The mouth part of the mask test head mould 5 can be opened and closed, and the actual protection effect of the mask on biological aerosol in different activities such as speaking, cough and the like of a person is simulated by combining the gas flow change of the breathing simulator.

The respiration simulation mechanism 3 includes a gas sampling tube 31, an inhalation assembly 32, an exhalation assembly 33, and a detector; the air suction component 32 and the air exhaling component 33 are connected with the mask test head die 5 through the air sampling tube 31, the air suction component 32 is used for extracting air in the mask, and the air exhaling component 33 is used for inputting air into the mask.

The cabin aerosol sampling mechanism 4 is communicated with the cabin and is used for extracting aerosol gas in the cabin.

The detector is connected to the inhalation assembly 32 and the in-cabin aerosol sampling mechanism 4 for detecting the aerosol concentration in the mask and the aerosol concentration in the cabin during inhalation.

Wherein a temperature and humidity sensor, a heater 21, a humidifier 22 and a circulating fan 23 are arranged in the cabin body of the test cabin 2, and in a preferred embodiment, the heater 21 and the circulating fan 23 are arranged at the top of the cabin; the humidifier 22 is arranged on the side wall of the cabin, and the temperature and the humidity in the cabin are adjusted according to the detection requirement through the temperature and the humidity in the test cabin detected by the temperature and humidity sensor; the circulation fan 23 can promote the circulation flow of air in the cabin and regulate the uniformity of temperature, humidity and aerosol in the cabin.

The test chamber 1 is also connected with a pressure balancing filter 24 for balancing the pressure between the test chamber 1 and the negative pressure safety cabinet operation chamber, and avoiding the leakage of aerosol.

Further, as shown in fig. 2, the aerosol generating mechanism 1 includes: a first air feed pump 11, a first filter 12, an aerosol generator 13, an aerosol mixing chamber 14, an aerosol static neutralizer 15 and an aerosol drying tube 16.

The air outlet of the first air feeding pump 11 is connected with the upstream end of the first filter 12, and the downstream end of the first filter 12 is connected with the first air inlet of the aerosol mixing cavity 13; the outlet of the aerosol generator 14 is connected to a second inlet of the aerosol mixing chamber 13.

The air outlet of the aerosol mixing chamber 14 is connected with the air inlet of an aerosol drying tube 16 through an aerosol static neutralizer 15. The air outlet of the aerosol drying duct 16 is connected to an air inlet connected to the cabin.

Specifically, the biological aerosol for testing the mask protection effect is generated through the aerosol generator 13, clean air is generated through the first air supply pump 11 and the first filter 12, the generated clean air and the biological aerosol are mixed in the aerosol mixing cavity 14, the mixed aerosol eliminates the carried charges through the aerosol static neutralizer 15, the carried moisture is further eliminated through the aerosol drying tube 16, the biological aerosol with neutral and different particle sizes is formed, and the biological aerosol with different particle sizes is sent into the test cabin 2 through the clean air.

In an alternative embodiment, as shown in fig. 1, the mask aerosol protection performance testing device further includes a negative pressure safety cabinet 6, where the testing device is placed in the negative pressure safety cabinet 6, and the negative pressure safety cabinet 6 is provided with an exhaust channel for exhausting the exhaust gas generated by the testing cabin 2.

Specifically, the aerosol generating mechanism 1, the test cabin 2 and the aerosol sampling tube 31 are all arranged in the operation cabin of the negative pressure safety cabinet 6, in the process of carrying out mask protection effect test experiment, negative pressure in the operation cabin is maintained through air suction of an intra-cabin fan, and harmful substances such as leaked aerosol can be limited in the operation cabin by the negative pressure safety cabinet 6 and discharged to the outside of the cabinet through the high-efficiency filter of the negative pressure safety cabinet, so that the leaked aerosol is prevented from directly entering the atmosphere to pollute the experiment personnel and the environment.

Further, as shown in fig. 1, an ultraviolet sterilizing lamp 61 is arranged at the top of the negative pressure safety cabinet 6, so as to facilitate preliminary sterilization of the experimental space.

The negative pressure safety cabinet 6 is reserved with a hydrogen peroxide disinfection interface, if the test pathogen has high pathogenicity, the operation cabin can be disinfected by externally connecting a hydrogen peroxide generator, a sampling device in the test cabin in the air suction simulation device is started in the disinfection process, vaporized hydrogen peroxide can be sucked into the test cabin at the same time, devices in the cabin and the high-efficiency filter are disinfected, and biological safety is ensured.

On the basis of the above embodiment, further, description is made of the structure and implementation procedure of the inhalation assembly and the exhalation assembly in the respiration simulation mechanism:

in a first aspect, the aspirator assembly 32 comprises: a first suction pump 321, a first flow meter 322, a second filter 323, and a first aerosol sampler 324; the first air pump 321 is connected to one end of the second filter 323 through the first flowmeter 322, the other end of the second filter 323 is connected to the first aerosol sampler 324, the first aerosol sampler 324 is connected to the gas sampling tube 31, and the detector can detect the concentration of the aerosol gas collected in the first aerosol sampler 324.

Wherein the aerosol sampler is a liquid impact type sampler.

Specifically, when the suction is simulated, the first suction pump 321 is kept normally open, a certain suction flow is controlled through the first flow meter 322, the first flow meter 322 can be a flow controller, and a flow display can be arranged beside the flow controller so as to observe the flow condition. Referring to fig. 3, during simulated inhalation, the first three-way electromagnetic valve 326 is controlled by the first circulation switch 325 to open the air inlet connected with the first aerosol sampler 324, and air is filtered by the mask, and then reaches the first air pump 324 from the mouth and nose of the head die through the air sampling tube 31, the first aerosol sampler 324, the first three-way electromagnetic valve 326 and the second filter 323 and is discharged into the negative pressure safety cabinet; when the air-breathing device is in the expiration process, the first three-way electromagnetic valve 326 is controlled by the first circulation switch 325 to be connected with the air inlet of the fifth filter 327, and air flow directly enters the fifth filter 327, the first three-way electromagnetic valve 326 and the second filter 323 from the negative pressure safety cabinet 6 to reach the first air pump 321 and is discharged into the negative pressure safety cabinet 6.

In a second aspect, exhalation assembly 33 includes: a second air feed pump 331, a third flowmeter 332, and a fourth filter 333; the second air feed pump 331 is connected to one end of a fourth filter 333 via a third flowmeter 332, and the other end of the fourth filter 333 is connected to the gas sampling tube 31.

Specifically, during the exhalation simulation, the second air-sending pump 331 is kept normally open, and a certain flow of air is output through the third flowmeter 332, where the third flowmeter 332 may be a flow controller, and correspondingly, a flow display is disposed beside the flow controller so as to observe the flow condition. When the air passes through the sixth filter 335 or the fourth filter 333 through the second circulation switch and the second three-way electromagnetic valve 334, and exhales, the air flow passes through the fourth filter 333 and then is humidified by the humidifying bottle 336, and the humidified air is discharged from the mouth and nose of the mask test head die 5 through the air sampling tube 31; while in the inspiration process, the airflow passes through the sixth filter 335 until it reaches the negative pressure safety cabinet 6.

According to different motion states of the test, the breathing flow and the frequency are simulated, the breathing flow is set to be 5-50L/min, and the breathing frequency is set to be 10-40 times/min.

As shown in fig. 3, the in-cabin aerosol sampling mechanism 4 in the mask aerosol protection performance test device includes: a second suction pump 41, a second flowmeter 42, a third filter 43, and a second aerosol sampler 44; the second air pump 41 is connected to one end of a third filter 43 through a second flowmeter 42, the other end of the third filter 43 is connected to a second aerosol sampler 44, the second aerosol sampler 44 is connected to the cabin, and the detector is used for detecting the concentration of the aerosol gas collected in the second aerosol sampler 44.

Specifically, when the aerosol in the environment of the test cabin 1 is sampled, the second air pump 41 is kept normally open, the air extraction flow is controlled by the second flowmeter 42, and when the aerosol is sampled, the air inlet connected with the second aerosol sampler 44 through the third three-way electromagnetic valve 46 is controlled by the third circulation switch 45 to be opened, and the air in the test cabin 1 reaches the second air pump 41 through the second aerosol sampler 44, the third three-way electromagnetic valve 46 and the third filter 43; when the sampling gap is located, the third circulation switch 45 controls the third three-way electromagnetic valve 46 to be connected with the air inlet of the seventh filter 47 to be opened, and air flow directly enters the seventh filter 47, the third three-way electromagnetic valve 46 and the third filter 43 from the negative pressure safety cabinet 6 to reach the second air pump 41 and is discharged into the negative pressure safety cabinet 6.

In the above embodiment, the flow second flowmeter 42 and the first flowmeter 322 control the ambient air sampling to be the same as the air sampling flow after the mask filtration, the corresponding circulation switch simultaneously controls the air inlet direction of the corresponding three-way electromagnetic valve, the sampling time is ensured to be the same, and the protection effect of the mask on the test bioaerosol is judged by using the detector to correspondingly detect the concentration of the bioaerosol in the second aerosol sampler 44 and the first aerosol sampler 324 and calculating the concentration difference.

In summary, the mask aerosol protection performance testing device provided by the embodiment of the utility model has the following advantages compared with the prior art:

first, dispose aerosol neutralizer and aerosol drying tube, avoided current aerosol generator to take place that the charged influence gauze mask filter effect of aerosol, the aerosol particle diameter that takes place is little influenced by the pathogen, can't embody the different grade pathogenic difference's problem.

The second aerosol generator and the aerosol sampler are suitable for generating and sampling different biological aerosols of bacteria, viruses, pollen and the like, and meet different testing requirements.

Third, through setting up breathing simulation mechanism, it is connected with gauze mask test head mould, and the subassembly that breathes in wherein can extract the gas in the gauze mask, and the simulation breathes in, exhale the subassembly and can input gas in the gauze mask, simulate expiration, and then realize better breathing simulation.

Fourth, the device collects aerosol generation, mixing, sampling and detection into a whole, can accurately simulate different biological aerosol pollution environments, and provides an effective evaluation platform for mask protection effect detection.

Fifth, all testing processes are located in a barrier environment, and the testing chamber is sterilized according to the operating bioaerosol level, ensuring biosafety.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A mask aerosol protective performance testing device, comprising: the device comprises an aerosol generating mechanism, a test cabin, a respiration simulation mechanism and an in-cabin aerosol sampling mechanism;

2. The mask aerosol protection performance testing device according to claim 1, wherein the aerosol generating mechanism comprises: the device comprises a first air feeding pump, a first filter, an aerosol generator, an aerosol mixing cavity, an aerosol static neutralizer and an aerosol drying tube;

3. The mask aerosol protection performance testing device according to claim 1, wherein the cabin is further provided with a heater and a humidifier;

4. A mask aerosol protection performance testing device according to claim 3, wherein the cabin is further provided with a circulation fan; the circulation fan is provided on top of the cabin.

5. A mask aerosol protection performance testing device according to claim 3, wherein a pressure balancing filter is further arranged on the side wall of the cabin, and the pressure balancing filter is used for balancing the internal pressure and the external pressure of the cabin.

6. The mask aerosol protection performance testing device according to claim 1, further comprising a negative pressure safety cabinet;

the test cabin is arranged in the negative pressure safety cabinet;

7. The mask aerosol protection performance testing device according to claim 6, wherein an ultraviolet disinfection lamp is arranged at the top of the negative pressure safety cabinet.

8. The mask aerosol protection performance testing device according to claim 1, wherein the inhalation assembly comprises: a first pump, a first flow meter, a second filter, and a first aerosol sampler;

9. The mask aerosol protection performance testing device according to claim 1, wherein the in-cabin aerosol sampling mechanism comprises: a second air pump, a second flowmeter, a third filter and a second aerosol sampler;

10. The mask aerosol protection performance testing device of claim 1, wherein the exhalation assembly comprises: a second air feed pump, a third flowmeter, and a fourth filter;