A differential pressure airtight leak detection device and a detection method for leakage flow

Abstract

The invention discloses a differential pressure type airtight leakage detection device and a leakage flow detection method thereof. The device comprises an air source, a pressure regulating valve, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, an air pressure gauge, a differential pressure sensor, a standard container,a tested container, a silencer and an auxiliary container. Aiming at whether the volume of the to-be-measured container is known or not, the invention provides two leakage flow detection methods: namely the leakage flow detection methods of the tested container under the two situations of known and unknown volumes; for a container to be tested, the auxiliary container needs to be disconnected firstly for the leakage flow detection with the known volume; the auxiliary container needs to be connected firstly for the leakage flow detection with the unknown volume; and the rest steps of the two detection methods are similar to those of the existing detection method. The device and the method have the advantages that the leakage flow detection of the to-be-tested container under the known volume condition can be achieved, and can also be used for detecting the leakage flow of the to-be-tested container under an unknown volume condition.

Description

technical field [0001] The invention relates to the technical field of airtightness detection, in particular to a differential pressure airtightness leak detection device and a detection method for leakage flow thereof, which can be used to detect the leakage of the measured container under the condition of known volume The flow rate can also be used to detect the leakage flow rate of the measured container in the case of unknown volume. Background technique [0002] Currently common differential pressure leak detectors, such as figure 1 As shown, it is usually composed of intake and exhaust control valve 1, first valve 2, second valve 3, differential pressure sensor 10, reference container 8 and measured container 9; its working principle is: through a controlled intake and exhaust Control the valve to connect the reference container 8 and the measured container 9. When testing, first inflate them at the same time, and when the pressure of both of them reaches the same and...

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Problems solved by technology

[0005] Although, as figure 1 or figure 2 The existing differential pressure airtight leak detectors shown can all be used to calculate the leakage flow produced by the measured container 9 when it leaks, but the existing differential pressure airtight leak detectors are all It is only when the volume of the measured container 9 is known that its specific leakage flow value can be clearly calculated; and when the volume of the measured container 9 is unknown, there is currently no more effective device or method that can Get its specific leakage flow

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