Briefly describe the thermodynamics and fluid mechanics design analysis of the air permeability tester

The air permeability tester uses high-precision vacuum sensors and pressure sensors to effectively ensure the test accuracy of the instrument. The water bath temperature control system can realize automatic temperature control, wider temperature control range, and independent control of upper and lower test chambers and sensors. temperature, ensuring the accuracy of test results. With an external two-in-one tablet and a professional operating system, the entire experimental process is automatically completed and the results are automatically displayed.

The instrument adopts a three-chamber integrated test block structure designed by thermodynamic and fluid mechanics analysis. It supports simultaneous testing of three same or different samples, and the internal temperature and humidity of the equipment adjust automatically.atically. Each test chamber is equipped with a temperature and humidity sensor to monitor the temperature and humidity. Quality conditions and control testing process is more accurate. It is equipped with a high-performance processor and Windows 10 operating system, and is universal for various software and equipment. It has an automatic test mode and requires no manual adjustment to quickly obtain accurate results. Professional test mode provides flexible and rich instrument control functions to meet personalized scientific research needs.

The main component of the air permeability tester is the differential pressure sensor. After secondary development, its principle is to use the gas flow law to calculate the leak by measuring the change in pressure inside the container. The airtightness test method of airtight container leadinevitably has a loss of gas mass in the container due to leakage, and the original pressure in the container will be reduced. Therefore, the actual pressure reduction value of the gas in the container can be calculated by measuring the pressure difference.air tightness test method. The amount of gas escaping from the container is compared to the standard part. If it is greater than the amount of gas that escaped, it is considered a defective product, and if it is less than the amount of gas that escaped, it is considered a good product, achieving thus an airtightness test.

When the specified vacuum degree is reached, close the lower test chamber, fill the high pressure chamber (upper chamber) with a certain pressure of test gas and make sure that a certain test gas pressure builds up on both sides of the sample. A constant pressure difference (adjustable);in this way, the gas will penetrate from the high pressure side to the low pressure side under the action of the pressure difference gradient. By monitoring the pressure on the low pressure side, various barrier parameters of the tested sample can be obtained. .

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