Abstract: Helium is a commonly used airship floating gas. The ability of airbag airbags to store helium is an important factor affecting the use of airships. In this paper, an effective test method for verifying the helium gas storage capacity of airship airbags is introduced by testing the airflow permeation of airship airbag samples and the description of the test principle, test equipment parameters, application range and test procedure.

Key words: helium gas, helium gas permeation, airship airbag, helium gas barrier, differential pressure gas permeation instrument

1 , meaning

The airship is a kind of aerostat. It relies mainly on the lighter air in the airbag to achieve the lifting, such as hydrogen and helium. Because of the danger of hydrogen, modern airships usually use helium with higher safety. As a rising gas. According to the buoyancy principle, the amount of helium filled in the airbag is an important factor in determining the amount of buoyancy that can be generated, directly affecting the height at which the airship can fly. During the use of the airship, the amount of helium in the airbag is closely related to the ability of the airbag to retain the helium gas. If the airbag material has poor storage capacity for helium, it is easy to be lost during use, which will reduce the flying height of the airship. flight duration.

The permeability of helium in the material is an important indicator to measure the airbag's ability to retain helium. Therefore, the helium gas transmission of the airship airbag is tested in a targeted manner.

2 , test samples

In this paper, airship laminated composites are used as test samples.

3 , the test basis

In this test, the helium gas permeation amount of the sample was tested by the principle of differential pressure method, and the standard according to it was GB/T 1038-2000 " Phase Difference Method for Plastic Film and Sheet Gas Permeability Test Method ".

4 , test equipment

This paper uses the VAC-VBS differential pressure gas permeation instrument for testing. The equipment is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.

Figure 1 VAC-VBS differential pressure gas permeation meter

4.1 Test principle

The principle of differential pressure method refers to the test method for obtaining the relevant parameters of the gas permeability of the sample by testing the pressure difference on the low pressure side of the sample. Therefore, the principle method can be used to test oxygen, nitrogen, carbon dioxide, and six. Permeation performance of various gases such as sulfur fluoride and helium.

The method divides the test chamber of the device into a high pressure chamber and a low pressure chamber through a sample, and the high pressure chamber is filled with a test gas of a certain pressure, and a low pressure environment is formed by vacuuming in the low pressure chamber, and the test gas is under the action of the pressure difference. The high pressure chamber penetrates the low pressure side through the sample, and the pressure in the low pressure chamber changes with time during the stable infiltration. The gas permeation amount and related parameters of the sample are calculated.

4.2 Equipment parameters

The test range is 0.1 ~ 100,000 cm ³ /(m ² ·24h·0.1MPa) ; the test of 3 samples can be completed at the same time . The test result is the average value of the test results of 3 samples; the temperature range of the sample is 15 ~ 55 °C , temperature control accuracy is ±0.1 °C ; standard film is provided for rapid calibration to ensure the accuracy and versatility of the test data; support Lystem ^TM laboratory data sharing system, unified management test results and test reports.

4.3 Scope of application

(1) This equipment is suitable for gas permeability testing of various films and sheets. Films include various plastic film, paper-plastic composite film, co-extruded film, aluminized film, aluminum foil, aluminum foil composite film and other film-like materials; sheet materials include various engineering plastics, rubber, building materials and other sheet materials, such as PP Sheet, PVC sheet, PVDC sheet.

(2) This equipment can also be extended to aerospace materials, paper and paperboard, paint film, fiberglass cloth, glass fiber paper, cosmetic hose sheets, various rubber sheets and other materials for gas permeability testing.

(3) This equipment is suitable for the permeability test of various gases, such as oxygen, carbon dioxide, nitrogen, helium, air, etc.

(4) This equipment meets many national and international standards, such as ISO15105-1 , ISO2556 , GB/T1038 , ASTM D1434 , JIS K7126-1 , YBB00082003 .

5 , the test process

(1) Three samples of 97 mm in diameter were cut from the airship bag sample .

(2) Apply a layer of vacuum grease around the periphery of each test chamber, and place a piece of filter paper on the test area, attach the sample to the test chamber, and gently press to remove the air bubbles between the sample and the test chamber. The sample is clamped by a clamping device.

(3) After the device is connected to helium, set the sample name, thickness, test mode, test temperature, humidity, vacuum time and other parameters on the control software. Click the “Start Test” option to open the vacuum pump and test. The equipment is automatically tested according to the set parameters. After the test is over, the test results are displayed.

6 , test results

The air permeability of the airship sample tested in this test was 28.91 cm ³ /(m ² ·24h·0.1MPa) .

7 , conclusion

The airship airbag should have a high gas barrier property to prevent the loss of internal gas and the penetration of external air into the airbag, thereby maintaining the amount of internal floating gas and gas purity. In this paper, the airbag material's ability to preserve internal helium is evaluated by the test of helium gas transmission. The test process is simple, the human factors are less interfered, the equipment is intelligent, and the test results are accurate and reliable. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R&D, production and packaging inspection services for packaging inspection equipment. The existing equipment includes gas permeability tester, oxygen transmission tester, water vapor transmission tester and intelligent electronics. Tensile testing machine, sealing tester, heat sealing tester, dart impact quality, pendulum impact tester, friction coefficient meter and so on . The more you understand, the more you trust! Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry.

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