Detection system of air supply and exhaust filtering type respirator

Abstract

The utility model discloses a detection system of an air supply and exhaust filtering type respirator, and relates to the technical field of respirator detection. The head mold is arranged in the cabin body and is used for wearing a hood of the detected air supply and exhaust filtering type respirator; the pressure difference detection unit comprises a wind pressure transmitter, a first temperature and humidity sensor, a second temperature and humidity sensor and a gas mass flow meter; the filtering efficiency detection unit comprises a particle-containing air generation system, a first particle laser counter and a second particle laser counter; the dead space detection unit comprises a respiration simulator, a carbon dioxide adsorber, a carbon dioxide supply assembly, an air pump and a carbon dioxide sensor; the noise detection unit comprises a noise transmitter arranged in the head mold; and the controller is in signal connection with the upper computer. And the detection efficiency and accuracy of the air supply and exhaust filter type respirator are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of respirator detection, in particular to a detection system for an air supply and exhaust filter type respirator. Background Art

[0002] With the increasing number of highly pathogenic infectious diseases and highly contagious group infection incidents with increasingly shorter occurrence cycles, equipment and instruments for responding to biological threats and unknown viruses and biological contamination, such as powered air-exhaust purifying respirators, are playing an increasingly key role in the large-scale isolation and transfer of group infected people. It can play a key role in quickly isolating abnormally infected people and effectively curbing the speed of transmission.

[0003] However, the existing devices or instruments for testing the indicators of powered air-purifying respirators are relatively simple, and the test items specified in the relevant standards can only be tested by a single test device for one item or function; for example: the static pressure difference, dynamic pressure difference and temperature and humidity, air volume, filtration efficiency, dead space, noise, continuous use time and other indicators of powered air-purifying respirators. The existing tests can only use different testing equipment or instruments to test the above indicators. There is no device or testing instrument in the industry that can test multiple key indicators of powered air-purifying respirators on the same platform.

[0004] When testing different indicators and test items of powered air-purifying respirators, the tested powered air-purifying respirators need to be repeatedly installed and connected in different testing devices, which will result in different states when worn. The temperature, humidity, noise, and pressure of the test items cannot be guaranteed to be the same or the same test conditions in different environments, resulting in inconsistent testing conditions, distorted test data, test results that do not meet standard requirements, inaccurate data, and large differences in test values ​​for the same product.

[0005] When testing different indicators, the operating regulations and methods of different testing devices are different. Frequent wear tests will cause different degrees of wear on the powered air-purifying respirator, shorten its service life, and reduce its protection level.

[0006] Different test items require different testing equipment or instruments, resulting in a long test cycle for powered air-purifying respirators and the timeliness of test result data. This cannot adapt to or meet the high infectiousness and rapid spread of biological infections, and will result in relevant individual protective equipment not being able to be put into the prevention and treatment of group infection events in a timely manner, and cannot effectively play a key role in curbing the speed of transmission. Utility Model Content

[0007] The purpose of the utility model is to provide a detection system for supply and exhaust air filtering respirators to solve the problems existing in the above-mentioned prior art, realize the testing of multiple key indicators of supply and exhaust air filtering respirators in the same detection system, and improve the detection efficiency and accuracy of supply and exhaust air filtering respirators.

[0008] To achieve the above purpose, the utility model provides the following solutions:

[0009] The utility model provides a detection system for an air supply and exhaust filter respirator, comprising:

[0010] A cabin, wherein the cabin is airtight;

[0011] A head model, the head model is arranged in the cabin and is used to wear the hood of the air supply and exhaust filtering respirator to be tested;

[0012] A pressure difference detection unit, the pressure difference detection unit includes a wind pressure transmitter, a first temperature and humidity sensor, a second temperature and humidity sensor, and a gas mass flowmeter for detecting the gas flow of the fan of the air supply and exhaust filtering respirator; the wind pressure transmitter is used to detect the pressure difference between the cavity between the hood and the head mold and the external environment, the first temperature and humidity sensor is arranged in the hood and is used to detect the temperature and humidity of the cavity between the hood and the head mold, and the second temperature and humidity sensor is arranged outside the head mold and is used to detect the temperature and humidity of the external environment;

[0013] A filtration efficiency detection unit, the filtration efficiency detection unit comprising a particle-containing air generating system, a first particle laser counter for detecting the number of particles located in the cabin and outside the hood of the air-purifying respirator, and a second particle laser counter for detecting the number of particles in the hood of the air-purifying respirator, wherein an air outlet of the particle-containing air generating system is connected to the cabin;

[0014] A dead space detection unit, the dead space detection unit comprising a breathing simulator, a carbon dioxide adsorber, a carbon dioxide supply assembly, an air pump and a carbon dioxide sensor, the air outlet of the carbon dioxide adsorber and the air supply port of the carbon dioxide supply assembly are respectively connected to the inhalation port of the breathing simulator, the air inlet of the carbon dioxide adsorber is connected to the inhalation and outlet of the head model, the exhalation port of the breathing simulator is connected to the exhalation inlet of the head model, the air inlet of the air pump is connected to the breathing tube through a bypass detection tube, and the air outlet of the air pump is connected to the carbon dioxide sensor;

[0015] A noise detection unit, the noise detection unit comprising a noise transmitter disposed in the head mold;

[0016] A controller, the wind pressure transmitter, the first temperature and humidity sensor, the second temperature and humidity sensor, the gas mass flow meter, the particle-containing air generating system, the first particle laser counter and the second particle laser counter, the breathing simulator, the air pump driving device, the carbon dioxide sensor and the noise transmitter are respectively connected to the controller;

[0017] A host computer, wherein the controller is connected to the host computer by signal.

[0018] Preferably, there are two wind pressure transmitters, namely a first wind pressure transmitter and a second wind pressure transmitter. The first wind pressure transmitter is arranged at the forehead of the head mold, one probe of the first wind pressure transmitter is arranged between the hood and the head mold, and the other probe is arranged outside the hood and the head mold; the second wind pressure transmitter is arranged at the chin of the head mold, one probe of the second wind pressure transmitter is arranged between the hood and the head mold, and the other probe is arranged outside the hood and the head mold.

[0019] Preferably, the particle-containing air generating system includes a filter pressure reducing valve, an oil mist separator, an aerosol generator and an air storage tank which are connected in sequence, the air inlet of the filter pressure reducing valve is connected to a compressed air source, the breathing tube and the cabin are connected to an air outlet of the air storage tank, respectively, and valves are provided on the connecting pipe between the breathing tube and the air storage tank and on the connecting pipe between the cabin and the air storage tank, respectively; it also includes a heater and a static eliminator which are connected in sequence, the air inlet of the heater is connected to the air outlet of the oil mist separator, and the air outlet of the static eliminator is connected to the air storage tank.

[0020] Preferably, the particle-containing air generating system further comprises a pressure transmitter for detecting the pressure of the air outlet of the oil mist separator.

[0021] Preferably, the breathing simulator adopts a cylinder, and the inlet and the exhalation port of the breathing simulator are both communicated with the rodless cavity of the cylinder, the inlet is connected to an inlet pipe, the outlet of the carbon dioxide adsorber and the supply port of the carbon dioxide supply assembly are respectively connected to one end of the inlet pipe away from the inlet, and a second solenoid valve is arranged on the pipeline between the exhalation port of the breathing simulator and the exhalation inlet of the head model.

[0022] Preferably, the inhalation outlet is connected to the breathing tube via an inhalation branch pipe, and the exhalation inlet is connected to the breathing tube via an exhalation branch pipe.

[0023] Preferably, the carbon dioxide supply assembly comprises a pressure sensor and a carbon dioxide gas source, a pressure reducing valve, a flow meter and a first solenoid valve which are connected in sequence, the gas outlet of the first solenoid valve is connected to the air intake pipe, and the pressure sensor is used to detect the gas pressure at the gas outlet of the pressure reducing valve;

[0024] The pressure sensor is connected to the controller signal, and the controller can control the operation of the first solenoid valve and the second solenoid valve.

[0025] Preferably, the carbon dioxide adsorber is filled with a carbon dioxide adsorbent, a third solenoid valve is provided on the pipeline between the carbon dioxide adsorber and the air intake and outlet of the head mold, and the third solenoid valve is electrically connected to the controller.

[0026] Preferably, the air pump is a micro diaphragm air pump.

[0027] Compared with the prior art, the utility model has achieved the following technical effects:

[0028] The detection system of the air supply and exhaust filtering respirator of the utility model can complete multiple tests including static pressure difference, dynamic pressure difference, temperature and humidity, air volume, filtration efficiency, dead space, noise and continuous use time through one installation, thereby improving the detection efficiency and accuracy of the air supply and exhaust filtering respirator.

[0029] Furthermore, when in use, the detection system of the air supply and exhaust filtering respirator of the utility model can control the operation of each component through a controller and collect, calculate and feed back the signals of each sensor to a host computer for display, which is easy to use.

[0030] Furthermore, the detection system of the air supply and exhaust filtering respirator of the utility model can simultaneously detect different key indicators of the air supply and exhaust filtering respirator, filling the gap in the relevant field.

[0031] Furthermore, the utility model solves the problem in the prior art that when testing different indicators of the power supply and exhaust air filtering respirator, it is necessary to repeatedly install and connect it in different testing devices, thereby reducing the wear and tear of the tested powered air supply and exhaust filtering respirator caused by the testing process of different testing devices and the shortening of its life.

[0032] Furthermore, the detection system of the air supply and exhaust filtering respirator of the utility model integrates multiple key indicator detection functions and has a high degree of integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1 It is a partial structural schematic diagram of the detection system of the air supply and exhaust filtering respirator of the utility model;

[0035] Figure 2 It is a partial structural schematic diagram of the detection system of the air supply and exhaust filtering respirator of the utility model;

[0036] Among them, 1. head mold; 2. first wind pressure transmitter; 3. second wind pressure transmitter; 4. controller; 5. first temperature and humidity sensor; 6. second temperature and humidity sensor; 7. compressed air source; 8. filter pressure reducing valve; 9. oil mist separator; 10. first two-way ball valve; 11. sixth solenoid valve; 12. gas storage tank; 13. second two-way ball valve; 14. heater; 15. static eliminator; 16. fifth solenoid valve; 17. first particle laser counter; 18. second particle laser counter; 19. carbon dioxide source; 20. pressure reducing valve; 21. flow meter; 22. first solenoid valve; 23. breathing simulator; 24. stepper motor driver; 25. carbon dioxide adsorber; 26. second solenoid valve; 27. third solenoid valve; 28. air pump; 29. ​​carbon dioxide sensor; 30. noise transmitter; 31. aerosol generator; 32. fan; 33. gas mass flow meter; 34. hood. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] The purpose of the utility model is to provide a detection system for supply and exhaust air filtering respirators to solve the problems existing in the above-mentioned prior art, realize the testing of multiple key indicators of supply and exhaust air filtering respirators in the same detection system, and improve the detection efficiency and accuracy of supply and exhaust air filtering respirators.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] like Figure 1-Figure 2 As shown, this embodiment provides a detection system for an air supply and exhaust filtering respirator, comprising:

[0041] Cabin, the cabin is closed;

[0042] A head mold 1, which is disposed in the cabin and is used to wear a hood 34 of the air supply and exhaust filtering respirator to be tested;

[0043] The pressure difference detection unit includes a wind pressure transmitter, a first temperature and humidity sensor 5, a second temperature and humidity sensor 6, and a gas mass flowmeter 33 for detecting the gas flow of the fan 32 of the air supply and exhaust filter respirator; the wind pressure transmitter is used to detect the pressure difference between the cavity between the hood 34 and the head mold 1 and the external environment. Since the head mold 1 and the hood 34 are both arranged in the cabin during the detection process, the external environment mentioned above refers to the space in the cabin except the head mold 1 and the hood 34. The first temperature and humidity sensor 5 is arranged in the hood 34 and is used to detect the temperature and humidity of the cavity between the hood 34 and the head mold 1. The second temperature and humidity sensor 6 is arranged outside the head mold 1 and is used to detect the temperature and humidity of the external environment;

[0044] The filtration efficiency detection unit includes a particle-containing air generation system, a first particle laser counter 17 for detecting the number of particles located in the cabin and outside the hood 34 of the air supply and exhaust filter respirator, and a second particle laser counter 18 for detecting the number of particles in the hood 34 of the air supply and exhaust filter respirator. The air outlet of the particle-containing air generation system is connected to the cabin;

[0045] A dead space detection unit, the dead space detection unit comprises a breathing simulator 23, a carbon dioxide adsorber 25, a carbon dioxide gas supply assembly, an air pump 28 and a carbon dioxide sensor 29, the air outlet of the carbon dioxide adsorber 25 and the air supply port of the carbon dioxide gas supply assembly are respectively connected to the inhalation port of the breathing simulator 23, the air inlet of the carbon dioxide adsorber 25 is connected to the inhalation air outlet of the head mold 1, the exhalation port of the breathing simulator 23 is connected to the exhalation air inlet of the head mold 1, the air inlet of the air pump 28 is connected to the breathing tube through a bypass detection tube, and the air outlet of the air pump 28 is connected to the carbon dioxide sensor 29;

[0046] A noise detection unit, the noise detection unit includes a noise transmitter 30 disposed in the head mold 1;

[0047] The controller 4, the wind pressure transmitter, the first temperature and humidity sensor 5, the second temperature and humidity sensor 6, the gas mass flow meter 33, the particle-containing air generation system, the first particle laser counter 17 and the second particle laser counter 18, the breathing simulator 23, the driving device of the air pump 28, the carbon dioxide sensor 29 and the noise transmitter 30 are respectively connected to the controller 4;

[0048] Host computer, controller 4 is connected with the host computer signal.

[0049] It should be noted that a movable door should be provided on the cabin to facilitate the user to wear the hood 34 of the tested air-purifying respirator on the head mold 1 in the cabin or to take out the hood 34 of the tested air-purifying respirator.

[0050] The detection system for the air-purifying respirator of the present embodiment can be used to perform multiple tests on the air-purifying respirator, including static pressure difference, dynamic pressure difference, temperature and humidity, air volume, filtration efficiency, dead space, noise and continuous use time.

[0051] The method for testing the static pressure difference of the air supply and exhaust filter respirator is as follows:

[0052] After installing the hood 34 on the head mold 1, the cabin is sealed, the test program in the host computer is opened, the fan 32 of the air supply and exhaust filter respirator is turned on, and the air volume gear to be tested is set. The air volume generated by the fan 32 is first transmitted to the gas mass flow meter 33, which is a thermal mass flow meter, and the flow rate is measured by the gas mass flow meter 33. Then, the air volume is transmitted to the hood 34 worn on the head mold 1, thereby generating a pressure difference value; the pressure difference between the breathing tube in the head mold 1 and the external environment is detected by the wind pressure transmitter, and the pressure difference value is automatically recorded by the test program in the host computer, thereby realizing the static pressure difference test.

[0053] It should be noted that the connecting pipe between the fan 32 and the hood 34 in the existing exhaust-filtering respirator products does not have a gas mass flow meter 33. Therefore, in this embodiment, during testing, it is necessary to install a gas mass flow meter 33 on the connecting pipe between the fan 32 and the hood 34.

[0054] The method for dynamic pressure difference detection of air supply and exhaust filtering respirators is as follows:

[0055] Install the hood 34 on the head mold 1, then seal the cabin, open the test program in the host computer, turn on the fan 32 of the air supply and exhaust filter respirator, set the air volume gear to be tested, and at the same time, set the respiratory frequency and tidal volume in the host computer, and then control the breathing tube in the head mold 1 through the breathing simulator 23 to simulate the breathing of the human body, so as to realize the dynamic breathing of the head mold 1; the air volume generated by the fan 32 is first transmitted to the gas mass flow meter 33, and the flow rate is measured by the gas mass flow meter 33. Then, the air volume is transmitted to the hood 34 worn on the head mold 1, thereby generating a pressure difference value; the pressure difference between the cavity between the hood 34 and the head mold 1 and the external environment is detected by the wind pressure transmitter, and the pressure difference value is automatically recorded by the test program in the host computer, so as to realize the test of static pressure difference.

[0056] Since the first temperature and humidity sensor 5 and the second temperature and humidity sensor 6 are provided in the head mold 1, the first temperature and humidity sensor 5 is arranged in the hood 34 and is used to detect the temperature and humidity of the cavity between the hood 34 and the head mold 1, and the second temperature and humidity sensor 6 is arranged outside the head mold 1 and is used to detect the temperature and humidity of the external environment. In the process of static pressure difference and dynamic pressure difference detection, the first temperature and humidity sensor 5 and the second temperature and humidity sensor 6 can realize the detection of the temperature and humidity in the cavity between the hood 34 and the head mold 1 and the temperature and humidity of the external environment.

[0057] The method for testing the air volume of the air supply and exhaust filter respirator is as follows:

[0058] After the hood 34 is installed on the head mold 1, the test program in the host computer is opened, the fan 32 of the air supply and exhaust filter respirator is turned on, and the air volume gear to be tested is set. The air volume generated by the fan 32 is first transmitted to the gas mass flow meter 33, and the flow rate is measured by the gas mass flow meter 33. Then, the air volume is transmitted to the hood 34 worn on the head mold 1. During this process, the gas mass flow meter 33 records and detects the air volume generated by the fan 32 in real time, thereby realizing air volume detection.

[0059] In the optional scheme of this embodiment, it is more preferred that the breathing simulator 23 adopts a cylinder, the inhalation port and the exhalation port of the breathing simulator 23 are both connected to the rodless cavity of the cylinder, the inhalation port is connected to an inhalation pipe, the outlet of the carbon dioxide adsorber 25 and the supply port of the carbon dioxide supply assembly are respectively connected to one end of the inhalation pipe away from the inhalation port, and a second solenoid valve 26 is arranged on the pipeline between the exhalation port of the breathing simulator 23 and the exhalation inlet of the head mold 1. The inhalation outlet is connected to the breathing tube in the head mold 1 through the inhalation branch pipe, and the exhalation inlet is connected to the breathing tube through the exhalation branch pipe. The driving device of the breathing simulator 23 is driven by a linear slide module, and the slide of the linear slide module is connected to the piston rod of the cylinder. When the slide reciprocates, it drives the piston rod and piston of the cylinder to move together, thereby realizing positive and negative pressure in the rodless chamber. When there is positive pressure in the rodless chamber, the solenoid valve on the inhalation port is closed, and the solenoid valve on the exhalation port is opened. When there is negative pressure in the rodless chamber, the solenoid valve on the inhalation port is opened, and the solenoid valve on the exhalation port is closed, thereby realizing breathing simulation; the breathing frequency is achieved by the output speed of the linear slide module drive, that is, it is achieved by the pulse frequency given by the stepper motor driver 24; tidal volume: the cylinder diameter of the cylinder is certain, and the movement of the cylinder piston rod is driven by the stepper motor module, and the specific gas volume can be obtained by the length of the piston movement distance.

[0060] In the optional scheme of this embodiment, it is more preferred that there are two wind pressure transmitters, namely the first wind pressure transmitter 2 and the second wind pressure transmitter 3. The first wind pressure transmitter 2 is arranged at the forehead of the head mold 1, one probe of the first wind pressure transmitter 2 is arranged between the head mold 1 and the head cover 34, and the other probe is arranged outside the head cover 34 and the head mold 1 and located in the cabin; the second wind pressure transmitter 3 is arranged at the chin of the head mold 1, one probe of the second wind pressure transmitter 3 is arranged between the head mold 1 and the head cover 34, and the other probe is arranged outside the head cover 34 and the head mold 1 and located in the cabin. It should be noted that the specific number and setting position of the wind pressure transmitters can be appropriately adjusted according to actual needs.

[0061] The method for testing the filtration efficiency of the air supply and exhaust filter respirator is as follows:

[0062] (1) Install the hood 34 on the head mold 1, then seal the cabin, open the test program in the host computer, turn on the fan 32 of the air supply and exhaust filter respirator, set the air volume gear to be tested, and the air volume generated by the fan 32 is first transmitted to the gas mass flow meter 33, and the flow rate is measured by the gas mass flow meter 33. Then, the air volume is transmitted to the hood 34 worn on the head mold 1;

[0063] (2) Particle-containing air is generated by a particle-containing air generating system and outputted into the cabin. The number of particles entering the cabin is detected by a first particle laser counter 17 of the cabin, and the number of particles in the hood 34 is detected by a second particle laser counter 18. The system calculates the filtration efficiency of the hood 34 based on the above two detection data and the existing filtration efficiency calculation method.

[0064] It should be noted that the first particle laser counter 17 is preferably disposed at the connection port between the particle-containing air generating system and the cabin to improve the detection accuracy of the first particle laser counter 17 .

[0065] In the optional scheme of this embodiment, it is more preferred that the particle-containing air generating system includes a filter pressure reducing valve 8, an oil mist separator 9, an aerosol generator 31 and an air storage tank 12 which are connected in sequence, the air inlet of the filter pressure reducing valve 8 is connected to the compressed air source 7 through a straight-through joint, the breathing tube and the cabin are respectively connected to the air outlet of the air storage tank 12, and valves are respectively provided on the connecting pipe between the breathing tube and the air storage tank 12 and on the connecting pipe between the cabin and the air storage tank 12. When the air supply and exhaust filtering respirator is subjected to a positive pressure test, the valve on the connecting pipe between the cabin and the air storage tank 12 is opened, and the valve on the connecting pipe between the breathing tube and the air storage tank 12 is closed, so that The particle-containing air enters the cabin and is filtered by the air supply and exhaust filtering respirator and then sent into the breathing tube in the head mold. When the air supply and exhaust filtering respirator is subjected to a negative pressure test, the valve on the connecting pipe between the cabin and the gas storage tank 12 is closed, and the valve on the connecting pipe between the breathing tube and the gas storage tank 12 is opened, so that the particle-containing air enters the breathing tube in the head mold and then enters the cabin after being filtered by the air supply and exhaust filtering respirator. The particle-containing air generating system also includes a heater 14 and a static eliminator 15 which are connected in sequence, the air inlet of the heater 14 is connected to the air outlet of the oil mist separator 9, and the air outlet of the static eliminator 15 is connected to the gas storage tank 12.

[0066] In this embodiment, the air outlet of the oil mist separator 9 is connected to a fourth connecting pipe, the air inlet of the aerosol generator 31 and the air inlet of the heater 14 are respectively connected to one end of the fourth connecting pipe away from the oil mist separator 9, a fourth solenoid valve is arranged on the fourth connecting pipe, a first two-way ball valve 10 and a one-way valve (not shown in the figure) are arranged on the connecting pipeline between the air inlet of the aerosol generator 31 and the fourth connecting pipe, a second two-way ball valve 13 is arranged on the connecting pipeline between the air inlet of the heater 14 and the fourth connecting pipe, a fifth solenoid valve 16 is arranged on the connecting pipeline between the gas storage tank 12 and the cabin, a sixth solenoid valve 11 is arranged on the connecting pipeline between the air outlet of the aerosol generator 31 and the gas storage tank 12, the fourth solenoid valve, the fifth solenoid valve 16 and the sixth solenoid valve 11 are respectively electrically connected to the controller 4, and the fourth solenoid valve, the fifth solenoid valve 16 and the sixth solenoid valve 11 can be controlled to work by the controller 4.

[0067] In an optional solution of this embodiment, it is more preferred that the particle-containing air generating system further includes a pressure transmitter for detecting the pressure of the air outlet of the oil mist separator 9 , and the pressure transmitter is connected to the controller 4 by signal.

[0068] The method for dead space detection of air supply and exhaust filtering respirators is as follows:

[0069] (1) Install the hood 34 on the head mold 1, then seal the cabin, open the test program in the host computer, turn on the fan 32 of the air supply and exhaust filter respirator, set the air volume gear to be tested, and at the same time, set the breathing frequency and tidal volume in the host computer, and then control the breathing tube in the head mold 1 through the breathing simulator 23 to simulate human breathing, so as to realize dynamic breathing of the head mold 1;

[0070] (2) First inhalation: When the breathing simulator 23 controls the breathing tube in the head mold 1 to inhale for the first time, the third solenoid valve 27 is opened, and air enters the breathing tube through the mouth of the head mold 1, and then enters the carbon dioxide adsorber 25 through the third solenoid valve 27. After being adsorbed by the carbon dioxide adsorber 25, the air enters the rodless cavity of the cylinder, ensuring that the carbon dioxide concentration of the air entering the cylinder meets the standard value;

[0071] (3) Second exhalation: When the second solenoid valve 26 is opened and the breathing simulator 23 controls the breathing tube in the head mold 1 to exhale for the first time, the air in the rodless chamber of the cylinder is pumped into the breathing tube in the head mold 1 and exhaled;

[0072] (4) Second inhalation: When the first exhalation is completed, that is, when the air in the rodless chamber of the cylinder is completely discharged and the second inhalation is required, the third solenoid valve 27 is closed, and the first solenoid valve 22 in the carbon dioxide supply assembly is opened, and then the cylinder is controlled to make the rodless chamber of the cylinder inhale, and the air with a carbon dioxide content of 5% supplied by the carbon dioxide supply assembly will enter the rodless chamber of the cylinder through the inhalation pipe. Since the third solenoid valve 27 is closed, although this step is a simulated second inhalation, in fact, the breathing simulator 23 inhales the air supplied by the carbon dioxide supply assembly, and does not control the breathing pipe in the head mold 1 to perform the second inhalation;

[0073] (5) Second exhalation: After a set amount of air with a carbon dioxide content of 5% is inhaled into the rodless cavity of the cylinder, the first solenoid valve 22 is closed and the second solenoid valve 26 is opened. Then the breathing simulator 23 (i.e., the cylinder) starts to operate, and the air with a carbon dioxide content of 5% in the rodless cavity of the cylinder is exhaled through the breathing tube in the head mold 1 and exhaled into the cavity between the head mold 1 and the head cover 34;

[0074] (6) The third inhalation: When the second exhalation is completed, that is, the air portion with a carbon dioxide content of 5% in the rodless cavity of the cylinder is discharged and the third inhalation is required, the third solenoid valve 27 is opened, and the air enters the breathing tube through the mouth of the head mold 1, and then enters the carbon dioxide adsorber 25 through the third solenoid valve 27. After being adsorbed by the carbon dioxide adsorber 25, it enters the rodless cavity of the cylinder. At the same time, the air pump 28 is turned on, and the gas sample of the breathing tube in the head mold 1 during the third inhalation is pumped to the carbon dioxide sensor 29 through the air pump 28. The carbon dioxide sensor 29 uses an infrared light source to detect the light intensity of the wavelength, thereby reflecting the concentration of carbon dioxide gas;

[0075] Explanation of the dead space detection principle: The dead space in the air supply and exhaust filtering respirator refers to the volume fraction of the carbon dioxide gas re-inhaled in the previous exhalation, which is used to evaluate the safety of the respiratory system and determine the performance of the personal protective equipment; after one exhalation, the air supply and exhaust filtering respirator needs to discharge the gas between the head mold 1 and the head cover 34, but due to the limitations of the fan of the air supply and exhaust filtering respirator and the defects of the physical structure design, the carbon dioxide gas exhaled into the cavity between the head cover 34 and the head mold 1 in the previous exhalation cannot be completely discharged to the external environment, resulting in the carbon dioxide gas in the previous exhalation being re-inhaled during the next inhalation. Therefore, in this embodiment, the air with a carbon dioxide content of 5% is exhaled through the second exhalation, and during the third inhalation, the carbon dioxide content in the gas of the third inhalation is sampled and detected by the air pump 28, which can objectively reflect the performance of the dead space of the air supply and exhaust filtering respirator.

[0076] In the optional scheme of the present embodiment, it is more preferred that the carbon dioxide supply assembly includes a pressure sensor and a carbon dioxide gas source 19, a pressure reducing valve 20, a flow meter 21 and a first solenoid valve 22 connected in sequence, and the air outlet of the first solenoid valve 22 is connected to the intake pipe; the pressure sensor is used to detect the air pressure at the air outlet of the pressure reducing valve 20; the pressure sensor is connected to the controller 4 signal, and the controller 4 can control the operation of the first solenoid valve 22 and the second solenoid valve 26.

[0077] The specific working principle of the carbon dioxide gas supply component in this embodiment is as follows: first, open the first solenoid valve 22, and the outlet gas of the carbon dioxide gas source 19 is reduced to 0.2MPA through the pressure reducing valve 20, and one end flows into the pressure sensor, and the pressure of the gas path is detected by the pressure sensor; the other end passes through the flow meter 21, and the pressure reducing valve 20 is adjusted by observing the flow meter 21 and adjusting the flow rate to 40L / min, and is sucked into the rodless cavity of the cylinder through the first solenoid valve 22 and the intake pipe to complete the intake process.

[0078] In the optional scheme of this embodiment, it is more preferred that the carbon dioxide adsorber 25 is filled with a carbon dioxide adsorbent, and the adsorption of carbon dioxide in the inhaled air is completed by the carbon dioxide adsorbent. A third solenoid valve 27 is arranged on the pipeline between the carbon dioxide adsorber 25 and the air intake and outlet of the head mold 1, and the third solenoid valve 27 is electrically connected to the controller 4.

[0079] In the optional solution of this embodiment, it is more preferred that the air pump 28 adopts a micro diaphragm air pump.

[0080] The method for noise detection of air supply and exhaust filtering respirators is as follows:

[0081] After installing the hood 34 on the head mold 1, the cabin is sealed, the test program in the host computer is opened, and the fan 32 of the air supply and exhaust filter respirator is turned on. The tested air supply and exhaust filter respirator should use a fully charged battery, and the fan 32 rotates to the highest air supply volume. The air volume generated by the fan 32 is first transmitted to the gas mass flow meter 33, and the flow rate is measured by the gas mass flow meter 33. Then, the air volume is transmitted to the hood 34 worn on the head mold 1. During this process, the industrial noise transmitter 30 in the head mold 1 detects and records the real-time noise in the hood 34 in real time. The noise transmitter 30 uses a capacitive sensor, which converts the capacitance change caused by the sound into a voltage signal. The host computer can calculate the noise level and the maximum noise.

[0082] The method for testing the continuous working time of the air supply and exhaust filtering respirator is as follows:

[0083] Install the hood 34 on the head mold 1, then seal the cabin, open the test program in the host computer, turn on the fan 32 of the air supply and exhaust filter respirator, the tested air supply and exhaust filter respirator should use a fully charged battery, set the air volume gear to the MMDF air volume designed by the manufacturer, and the air volume generated by the fan 32 is first transmitted to the gas mass flow meter 33, and the flow rate is measured by the gas mass flow meter 33. Then, the air volume is transmitted to the hood 34 worn on the head mold 1. During this process, the system's timer counts, and the timer interacts with the timer mechanism of the operating system to achieve this; the system uses the above steps to detect the initial air supply volume, the final air supply volume, and the continuous working time.

[0084] In the description of the present utility model, it should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the test program in the host computer can be written and implemented by those skilled in the art based on existing computer programming technology and the detection method in this embodiment.

[0085] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A detection system for an air supply and exhaust air filtering respirator, characterized in that: include: A cabin, wherein the cabin is airtight; A head model, the head model is arranged in the cabin and is used to wear the hood of the air supply and exhaust filtering respirator to be tested; A pressure difference detection unit, the pressure difference detection unit includes a wind pressure transmitter, a first temperature and humidity sensor, a second temperature and humidity sensor, and a gas mass flowmeter for detecting the gas flow of the fan of the air supply and exhaust filtering respirator; the wind pressure transmitter is used to detect the pressure difference between the cavity between the hood and the head mold and the external environment, the first temperature and humidity sensor is arranged in the hood and is used to detect the temperature and humidity of the cavity between the hood and the head mold, and the second temperature and humidity sensor is arranged outside the head mold and is used to detect the temperature and humidity of the external environment; A filtration efficiency detection unit, the filtration efficiency detection unit comprising a particle-containing air generating system, a first particle laser counter for detecting the number of particles located in the cabin and outside the hood of the air-purifying respirator, and a second particle laser counter for detecting the number of particles in the hood of the air-purifying respirator, wherein an air outlet of the particle-containing air generating system is connected to the cabin; A dead space detection unit, the dead space detection unit comprising a breathing simulator, a carbon dioxide adsorber, a carbon dioxide supply assembly, an air pump and a carbon dioxide sensor, the air outlet of the carbon dioxide adsorber and the air supply port of the carbon dioxide supply assembly are respectively connected to the inhalation port of the breathing simulator, the air inlet of the carbon dioxide adsorber is connected to the inhalation and outlet of the head model, the exhalation port of the breathing simulator is connected to the exhalation inlet of the head model, the air inlet of the air pump is connected to the breathing tube in the head model through a bypass detection tube, and the air outlet of the air pump is connected to the carbon dioxide sensor; a noise detection unit, the noise detection unit comprising a noise transmitter disposed in the head mold; A controller, the wind pressure transmitter, the first temperature and humidity sensor, the second temperature and humidity sensor, the gas mass flow meter, the particle-containing air generating system, the first particle laser counter and the second particle laser counter, the breathing simulator, the air pump driving device, the carbon dioxide sensor and the noise transmitter are respectively connected to the controller; A host computer, wherein the controller is connected to the host computer by signal.

2. The detection system for the air supply and exhaust air filtering respirator according to claim 1, characterized in that: There are two wind pressure transmitters, namely a first wind pressure transmitter and a second wind pressure transmitter. The first wind pressure transmitter is arranged at the forehead of the head mold, one probe of the first wind pressure transmitter is arranged between the hood and the head mold, and the other probe is arranged outside the hood and the head mold; the second wind pressure transmitter is arranged at the chin of the head mold, one probe of the second wind pressure transmitter is arranged between the hood and the head mold, and the other probe is arranged outside the hood and the head mold.

3. The detection system for the air supply and exhaust air filtering respirator according to claim 1, characterized in that: The particle-containing air generating system comprises a filter pressure reducing valve, an oil mist separator, an aerosol generator and an air storage tank which are connected in sequence, wherein the air inlet of the filter pressure reducing valve is connected to a compressed air source, the breathing tube and the cabin are respectively connected to the air outlet of the air storage tank, and valves are respectively provided on the connecting pipe between the breathing tube and the air storage tank and on the connecting pipe between the cabin and the air storage tank; and further comprises a heater and a static eliminator which are connected in sequence, wherein the air inlet of the heater is connected to the air outlet of the oil mist separator, and the air outlet of the static eliminator is connected to the air storage tank.

4. The detection system for the air supply and exhaust air filtering respirator according to claim 3, characterized in that: The particle-laden air generating system further comprises a pressure transmitter for detecting the pressure of the air outlet of the oil mist separator.

5. The detection system for the air supply and exhaust air-purifying respirator according to claim 1, characterized in that: The breathing simulator adopts a cylinder, and the inlet and the exhalation port of the breathing simulator are both communicated with the rodless cavity of the cylinder, the inlet is connected with an inlet pipe, the outlet of the carbon dioxide adsorber and the supply port of the carbon dioxide supply assembly are respectively communicated with one end of the inlet pipe away from the inlet, and a second solenoid valve is arranged on the pipeline between the exhalation port of the breathing simulator and the exhalation inlet of the head model.

6. The detection system for the air-purifying respirator according to claim 1, characterized in that: The inhalation outlet is communicated with the breathing tube through an inhalation branch pipe, and the exhalation inlet is communicated with the breathing tube through an exhalation branch pipe.

7. The detection system for the air-purifying respirator according to claim 5, characterized in that: The carbon dioxide supply assembly includes a pressure sensor and a carbon dioxide gas source, a pressure reducing valve, a flow meter and a first solenoid valve which are connected in sequence, wherein the gas outlet of the first solenoid valve is connected to the air intake pipe, and the pressure sensor is used to detect the gas pressure at the gas outlet of the pressure reducing valve; The pressure sensor is connected to the controller signal, and the controller can control the operation of the first solenoid valve and the second solenoid valve.

8. The detection system for the air-purifying respirator according to claim 1, characterized in that: The carbon dioxide adsorber is filled with carbon dioxide adsorbent, and a third solenoid valve is arranged on the pipeline between the carbon dioxide adsorber and the air intake and outlet of the head mold, and the third solenoid valve is electrically connected to the controller.

9. The detection system for the air-purifying respirator according to claim 1, characterized in that: The air pump adopts a micro diaphragm air pump.

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