Air tightness detection system and air tightness detection method

Abstract

The embodiment of the invention provides an air tightness detection system and an air tightness detection method, and belongs to the technical field of detection. The air tightness detection system comprises a heating unit used for heating a first device to be detected, a first buffer device, and a second buffer device, one end of the first buffer device is connected with a first end of the first device to be detected through a first pipeline; a first pressure detection unit used for detecting the pressure in the first pipeline; and a pressure adjusting unit connected with the other end of the first buffer device through a second pipeline, wherein the first buffer device is used for preventing convection between the first pipeline and the second pipeline. According to the technical scheme provided by the invention, the problem of unstable pressure caused by severe convection between high-temperature gas and low-temperature gas can be prevented by adopting the first buffer device, so that the accuracy and the reliability of a test result of an air tightness detection test under a high-temperature condition can be improved.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to an airtightness detection system and an airtightness detection method. Background technique [0002] The air tightness detection system is widely used in the leakage detection in the production process of aerospace, automobiles, gas appliances and other parts. For example, it can detect the leakage of sealing materials and gas distribution plates in solid fuel cells and fuel cell systems under normal temperature conditions. air tightness. [0003] For some special components, especially the detection of solid fuel cells and sealing materials and gas distribution plates in fuel cell systems, the ambient temperature around them may change from low or normal temperature to high during use, and may There will be situations where the airtightness is good and meets the regulations at room temperature, but at high temperatures due to various factors such as material expansion and def...

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Problems solved by technology

[0003] For some special components, especially the detection of solid fuel cells and sealing materials and gas distribution plates in fuel cell systems, the ambient temperature around them may change from low or normal temperature to high during use, and may There will be situations where the airtightness is good and meets the regulations at room temperature, but at high temperatures due to various factors such as material expansion and deformation, the airtightness is not in compliance. Therefore, the airtightness test under high temperature conditions is very necessary. Yes, but the existing relevant air tightness testing equipment does not take into account that under high temperature conditions, there will be strong convection formed by the action of high temperature gas and low temperature gas, making the gas pressure unstable and resulting in unreliable test results. Existing air tightness detection systems are difficult to detect the air tightness of the equipment to be tested under high temperature conditions

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