Method and device for testing the tightness of pressure-bearing components in low-temperature environments

Abstract

The invention discloses a device and a method for airtightness detection of pressure bearing parts in a low-temperature environment. Since the low-temperature environment is directly established in a tested part, low establishment and maintenance cost of the low-temperature environment is realized; internal temperature and pressure of the tested part can be controlled to change quickly according to requirements, a practical operating environment of the tested pressure bearing part can be simulated, and limit indexes of low temperature resistance and pressure resistance of the tested pressure bearing part can be tested; airtightness detection is realized by detecting whether a refrigerating agent leaks or not. An automatic data acquisition module and an automatic control module of the device are capable of fully automatically operating for a long time under an unattended condition to acquire detection data in a long period, and rated service life indexes of the tested pressure bearing part can be accurately calculated out through long-period data analysis.

Description

technical field [0001] The invention relates to a component quality detection method and a detection device, in particular to a detection method and a detection device for the tightness detection of a pressure-bearing component in a low-temperature environment. Background technique [0002] Some pressure-bearing parts or components used in low temperature environments need to undergo a leak test before use to test their seal performance indicators. These performance indicators include: the sealing state at different low temperatures and different pressures, the change of the sealing indicators of the components during long-term operation, including working life tests, etc. Such components are widely used in aerospace, navigation, machinery, chemical and other equipment. Since such components are under pressure and used in low temperature environments, their performance indicators determine the safety, reliability and durability of related equipment. Such parts generally nee...

AI Technical Summary

Problems solved by technology

The current detection methods and detection devices have the following shortcomings: (1) It is necessary to build an external low temperature environment, and then put the parts into the low temperature environment for pressure testing, and the construction and maintenance of the low temperature environment are expensive; (2) If you want to change the test temperature of the component under test, you can only change the external environment temperature of the build to affect the temperature of the component. Since the control process is relatively slow, in order to save costs and time, the detection device generally only detects specific environments, such as temperature 1. Pressure is the index data of a fixed value, but in the actual use environment of parts, temperature and pressure are often variables, so there may be errors between the detection index data and the actual index data of parts

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