Airtightness test has those methods - Database & Sql Blog Articles

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With the continuous advancement of modern industrial production technology, higher and higher requirements have been placed on detection methods. The airtightness detection of the sealed container is one of the detection methods and plays an increasingly important role in ensuring the quality of the product.

In practical applications, sealability refers to the limit of the amount of media that is allowed to leak in the event that a certain pressure medium is applied to the seal being tested. The airtight medium defined herein is pressurized air at normal temperature. There are those methods for airtight detection. The air tightness test can be divided into two categories according to the test methods: one is judged by visually measuring the amount of air bubbles, that is, when a certain pressure of gas is filled into the workpiece cavity, it is immersed. Soak the soap in the water and judge whether the workpiece leaks or leaks according to the visual observation of bubbles in the soap bubbles or water. At present, this method is still widely used in the sealing pipes of refrigerators, air conditioners, and tank leak detection. However, this method has low test efficiency and is subject to subjective factors. At the same time, after the test, the workpiece must be dried and rust-proofed. The other type is judged by the signal output of the sensor, that is, the gas is filled into the workpiece cavity by a certain pressure, and the signal output of the pressure sensor is used to judge whether the workpiece has a leak, and the leak rate is calculated, that is, the pressure sensor output per unit time. The value of the change. This method is highly efficient, subject to subjective factors, and does not require additional processing of the workpiece after testing. 1 Airtightness test method 1.1 Single sensor direct detection method When the airtightness index of the seal is not required, the single sensor direct detection method shown in Fig. 1 (hereinafter referred to as method 1) can be used. The internal pressure of the workpiece to be tested is directly measured by a pressure gauge or a pressure sensor P, and the leakage rate of the workpiece is calculated according to the pressure change value within a certain period of time, that is, Δ=ΔP/ΔT. Figure 1 Single sensor directly