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气密性检测设备的正压法和负压法的区别


2023-12-21


气密性检测设备通常由控制系统、驱动系统、测量系统等组成。控制系统负责控制设备的运行,驱动系统负责提供气体压力,测量系统则负责检测压力变化情况。

近日,看到一些用户对于气密性检测设备有些疑惑,比如该设备的正压法和负压法的区别是什么?有什么不同?以下根据这个问题给大家说说如下:

气密封性检测设备

气密性检测设备的正压法和负压法的主要区别在于它们测试产品的密封性能时,气体压力的来源和变化方式不同。

1、正压法:在正压法中,气密性检测设备通过向被测产品内部充入一定压力的气体,使产品内部压力大于外部环境压力。然后,设备会检测一定时间间隔内的压力变化情况。如果压力下降值超过规定的范围,则说明产品存在泄漏。正压法主要用于检测产品的密封性能是否能够抵抗空气压力。

2、负压法:在负压法中,气密性检测设备通过抽气泵将测试腔体内的气体抽出,使产品内部压力小于外部环境压力。然后,设备会检测一定时间间隔内的压力变化情况。如果压力变化值超过规定的范围,则说明产品存在泄漏。负压法主要用于检测产品是否会遭受空气的侵蚀。

总的来说,正压法和负压法的主要区别在于它们的气体压力来源和变化方式不同,但都是通过测量一定时间间隔内的压力变化情况来判断产品是否存在泄漏。

以上有关于密性检测设备的正压法和负压法的区别的简述。

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