Some standard content:
National Standard of the People's Republic of China
Performance test methods
of lony tube respirators
This method is applicable to testing the partial performance of long tube masks to evaluate their quality. Test method for leakage rate of long tube mask face wings This method is used to test the leakage rate of long tube masks to evaluate their design and manufacturing quality. 1.1 Definition of terms
1.1.1 Mask leakage rate (1)
UDC 614.894
GB 6221--86
It refers to the ratio of the concentration of harmful pollutants (C) leaking into the mask through the mask's sealing frame, exhalation valve and other joints to the concentration of harmful pollutants outside the face wings (C,) after the mask is worn. That is, l (%) Ci/Ca×100. 1.1.2 Test medium
refers to the standard particles or gas substances used to test the leakage rate of the mask. 1.2 Principle
Wear the mask on a standard head shape with an artificial lung according to the specified conditions, place it in a test cabinet with an internal volume of about 2m, send the test medium of a certain concentration range into the test cabinet, start the artificial lung for breathing (testing the open-type mask, the specified clean air should be supplied when the air is sent to the hood), and after the conditions are stable, measure the concentration of the test medium inside and outside the mask and calculate the leakage rate. This method uses sodium chloride aerosol as the test medium.
1.3 Test equipment
The test device system is shown in Figure 1.
Figure 1 Leakage rate test device diagram
Dry filter: 2-flow meter, 3-aerosol dry diluter, 4-pressure gauge, 5-filter, 6-sodium chloride aerosol generator, 7-test surface; 8-head type, 9-test; 11-one lung: 10, 12-sodium flame photometer National Bureau of Standards 1986-04-09 Issued
1986-12-01 Implementation
1.3.1 Sodium chloride aerosol generator.
GB 6221-86
1.3.2 The test cabinet is made of transparent materials, with adjustable air density, and an internal volume of about 2m3, with aerosol (or gas) inlet, overflow port, sampling concave, etc.
1.3.3 The sodium chloride aerosol concentration is determined using a sodium flame photometer or other type of measuring instrument with a sensitivity higher than 10-5. 1.3.4 Sampling device: It consists of a vacuum pump, a polyethylene hose and a gas volume regulating valve, and the gas volume is not less than 0.5L/min. 1.3.5 Standard head shape: It complies with the size specified in GB2428-81 "Chinese Adult Head Shape Series". The head shape is equipped with a breathing tube and connected to the human lung.
1.4 Test conditions
1.4.1 The close-fitting mask should be worn with the corresponding standard head shape according to its adaptation range. The open-type mask and the air-supplied hood should be worn with the medium-sized standard head shape.
1.4.2 The close-fitting mask should be worn appropriately. The open-type mask and the air-supplied hood should not be worn too loosely. 1.4.3 Mask air supply conditions
: When testing the close-fitting mask, no additional air is supplied. The artificial lung is turned on. The inhaled air is taken from outside the test cabinet and purified by a high-efficiency filter (the aerosol filtration efficiency is greater than 99.995%). The close-fitting mask is fully tested. When testing a face mask, the resistance of the absolute filter shall be ≥176.4Pa (18mmH,0); when testing a half mask, the resistance of the absolute filter shall be ≥78.4Pa (≥8mmHz0)b. When testing an open-type face mask or steam-supplied hood, supply clean air first and then start the artificial lung under the following conditions. The electric blower mask should be connected to the matching hose, connected to the power supply at the rated voltage, and operated to supply air. The quantitative air supply mask should be connected to the matching hose (or medium-pressure hose) to supply air under the specified minimum air pressure conditions. 1,4.4 Person 1 lung action conditions
a Breathing waveform: sine wave.
b. 1.2±5%L of exhaled volume per minute.
c. 25±1 times of inhalation per minute.
1.4.5 Chlorine The concentration of sodium chloride aerosol is greater than 1mg/m, and the median diameter of the particles is less than 0.5um. It is sent to the test cabinet at a flow rate of 90~120L/mim.
1.4.6 The exhalation valve of the test mask meets the requirements of GB6220-86 "Long Tube Mask". 1..7 Install an air intake tube on the respiratory tube of the standard head shape and connect it to the sampling device. 1.5 Test steps
1.5.1 Preparation
Make preparations according to the requirements of 1.3~1.4, appoint a dedicated person to be responsible for equipment operation, data observation, and instrument inspection to make it in normal working state, and wear the mask to be tested correctly on the standard head shape as required and place it in the test cabinet. 1.5.2 Test
Wang: Send sodium chloride aerosol into the test cabinet to make it concentrated When the temperature meets the requirements and is stable, start the vacuum pump to take the gas sample and introduce it into the sodium flame photometer for measurement, and calibrate the reading to 100%, which is C. (Or measure its photocurrent, which is I). b. Determine the sodium chloride aerosol concentration in the clean air supply, take 5 data, and average the background concentration Cec. After starting human lung breathing 10 times, turn on the vacuum pump, and introduce the gas sample from the respiratory duct sampling point into the sodium flame photometer for measurement (measure its photocurrent I), take 5 data, and calculate the average concentration Ci. Each mask is tested and measured three times according to the above procedure. e: At the end of the test, stop supplying sodium nitride aerosol, electricity, gas, etc. 1.6 Test results
1.6.1 The leakage rate of each model mask in the test is calculated according to formula (1): l(%) -CC
The leakage rate 1 of each mask type is calculated by formula (2): 1.6.2
(1)
GB 6221-86
(lk + lk2 + lka)
Wherein: 1k, 1k2 and 1k3 are the leakage rates of three different masks of the same type of mask. 2 Test method for ventilation resistance of long tube mask
·(2)
This method stipulates that the mask of the mask is worn on a standard head shape, and inhalation or exhalation is carried out at a certain flow rate to measure the inhalation resistance or exhalation resistance of the mask, expressed in Pa (mmH, O). 2.1 Samples and test conditions
2.1.1 The ventilation resistance of each mask shall be based on the average value measured by 3 samples. 2.1.2 The standard head shape should match the mask type and be worn correctly. 2.1.3 The continuous air flow rate of the test shall refer to GB6220-86, with an error of less than ±2%. 2.1.4 The self-priming mask shall be connected to a hose with a length of 10m. 2.1.5 The on-demand air supply mask and the composite air supply mask shall be equipped with a gas source with the specified maximum and minimum operating pressure. 2.1.6 The blower type and the quantitative air supply mask shall simultaneously supply the specified amount of clean air. 2.2 Test equipment
The mask ventilation resistance test device is shown in Figure 2.
Figure 2 Mask ventilation resistance test device diagram
1-air volume regulating valve; 2-flow meter, 3-micromanometer, 4-pressure measuring tee, 5-standard head type; 6 Mask of the test mask 2.2.2 Flow meter: accuracy level 2.
2.2.3 Micromanometer: range greater than 1470Pa (150mmH,0), accuracy <1.96Pa (0.2mmH,0). 2.2.4 Standard head type: meet the requirements of GB2428-81. 2.2.5 Pressure measuring tee: air flow diameter Φ16±0.5mm, length 100mm, side pressure hole opening no larger than Φ6mm (can be made of metal, glass or plastic).
2.3 Test steps
2.3.1 Check that all joints of the test device are airtight. 2.3.2 Make the flow meter and micromanometer work normally according to the instructions. 2.3.3 Open the air volume regulating valve to make the air volume meet the specified value, and measure the system resistance P1. 2.3.4 Wear the mask, adjust the air volume to meet the specified value, and measure the total resistance P2. 2.4 Results
2.4.1 The mask resistance value is P=P2-Pi.
2.4.2 The resistance of this mask is the average of the resistance values of the three masks. 70
3 Test method for air tightness of low-pressure part of long-tube mask GB6221-86
Wear the mask of the mask on the standard head shape that meets GB2428-81, close the exhalation flap, the mask sealing frame and the end of the hose, inflate the mask to 1470Pa (150mmH, O), and check for air leakage. 4 Test method for operating pressure of air supply valve
This method stipulates that the mask of the mask is worn on the standard head shape, inhale at a certain flow rate, and measure the operating pressure of the air supply valve, expressed in Pa (mmH, O).
4.1 Sample and test conditions
4.1.1 For each type of air supply valve of the mask, the average value measured by 3 samples shall prevail. 4.1.2 The standard head shape should match the mask size and be worn correctly. The sealing frame should not leak (auxiliary measures can be taken). When the pressure inside the mask is -588Pa (-60mmH,O), the gas leakage should be less than 0.1L/min. 4.1.3 The test continuous airflow refers to GB6220-86, and the error is less than ±2%. 4.1.4 At the inlet of the air supply valve, there should be a gas source with the highest and lowest working pressures required by the mask. 4.2 Test equipment
4.2.1 See Figure 3 for the air supply valve test device.
Figure 3 Test diagram of the air supply valve action device
1-gas regulating valve, 2-flow meter, 3-micromanometer, 4-pressure measuring tee, 5-standard head type; 6-test mask, 7-test air supply valve 4.2.2 The specifications of flow meter, micromanometer, pressure measuring tee and standard head type are the same as those of Article 2.2 of GB6220-86. 4.2.3 The assembly of the test air supply valve should be complete. 4.3 Test steps
4.3.1 Check that all connection parts of the test device are airtight. 4.3.2 Make the flow meter and micromanometer work properly according to the instructions. 4.3.3 Wear the mask, start the vacuum pump, open the air volume regulating valve, make the flow meet the specified value, and measure the system resistance P1. 4.3.4 Connect the air supply valve to the mask, firmly connect its air inlet to the compressed air pipe end, open the compressed air valve, start the vacuum pump, adjust the air volume regulating valve, make the air flow meet the specified value, and measure the total resistance P2. 4.4 Conclusion Www.bzxZ.net
4.4.1 The action pressure value of the air supply valve is P=P2-P. 4.4.2 The action pressure value of the mask air supply valve is the average of the measured values of the three valves. 5 Performance test method of hose and medium-pressure hose This method is used to evaluate the quality of hoses and medium-pressure hoses. 71
5.1 Pressure test
GB 6221—86
5.1.1 For hoses that withstand a gas pressure of 10.098MPa (1kzf/cm2), take a 1m long sample and perform a 0.147MPa (1.5kgf/cm2) gas pressure (or water pressure) test at room temperature to observe whether there is any abnormality. 5.1.2 For hoses that withstand a gas pressure of 0.098~0.785MPa (1~8kgf/cm2), take a 1m long sample and perform a 0.980MPa (10kgf/cm2) gas pressure (or water pressure) test at room temperature to observe whether there is any abnormality. 5.2 Deformation test
Take a medium-pressure hose sample of 1m in length, clamp the middle part with two 10cm long hardwood pieces, and load 686N (70kgf) at room temperature to observe whether it is deformed and affects ventilation.
5.3 Bending test
Take a sample of 1m in length, bend it on a log with an outer diameter three times the inner diameter of the hose or medium-pressure hose at room temperature, at 180°, and observe whether there is any ventilation obstruction.
6 Performance test method for the connection part of the hose or medium-pressure hose 6.1 Tension test
At room temperature, perform a static load tensile test of 981N (100kgf) on the connection part to observe whether there is separation or other abnormalities. 6.2 Steam tightness test
When the inflation pressure in the hose is 0.029MPa (0.3kgf/cm2), observe whether there is leakage in the connection part. 7 Performance test method of blower
7.1 Operation test
The blower is connected to a hose of specified length, a flow regulator and a mask, and operates continuously for 6-8 hours. The air volume inhaled by the mask should be greater than 50L/min, and the blower has no abnormal phenomenon.
7.2 Single machine test
When the blower is operating normally, the outlet air volume should be greater than 100L/min, and the air pressure should be greater than 1274Pa (130mmH,0). 7.3 Air volume measurement refers to GB1236~76 "Fan performance test method" Additional notes:
This standard was proposed by the Ministry of Labor and Personnel of the People's Republic of China. This standard was drafted by the Beijing Institute of Labor Protection Science. The main drafters of this standard are Cheng Xingren, Jiao Qin, Sun Bin, and Zhang Xueli. 72
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