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Method and apparatus for leak testing

A test method and leak test technology, which is applied in the direction of measuring device, fluid tightness test, machine/structural component test, etc., can solve the problems of large extra cost and inability to detect small leaks, etc.

Inactive Publication Date: 2007-06-20
WILCO AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, if an impedance test device is installed in each test cavity, especially in the case of a multi-cavity flow tester, this method will bring considerable additional costs. In addition, it cannot detect Small leaks well below 1 micron, but largely independent of container shape and filling type

Method used

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  • Method and apparatus for leak testing

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Embodiment Construction

[0050] Accompanying drawing 1 qualitatively shows the change course chart of vapor pressure Pv(T) with respect to temperature. At a predetermined temperature Tx, if the corresponding vapor pressure Pvx of the liquid is reached, the liquid starts to evaporate. Above the vapor pressure curve is a liquid substance, and below it is a gaseous substance.

[0051] According to FIG. 2 , the device according to the invention comprises a test cavity 1 with a lid 3 which can be sealed airtightly. The vacuum pump 5 is connected to the test cavity 1, and it can be a traction pump, a rotary piston pump, a diffusion pump, or a turbo vacuum pump, a turbo molecular pump, and the like. This depends on the degree of vacuum that the cavity 1 needs to create. In addition, there is a vacuum pressure detector 7, which is a Pirani detector, used to measure the main air pressure in the test cavity 1. There is at least one closed container 9, at least a certain degree of filling is housed therein, a...

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PUM

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Abstract

For leak testing closed containers ( 9 ) which are filled with a filling product containing at least one liquid component the container is introduced in a test cavity ( 1 ) which is evacuated at least down to vapour pressure of that liquid component. The pressure in the surrounding of the container ( 9 ) and thus within test cavity ( 1 ) is monitored. Monitoring is performed by a vacuum pressure sensor ( 7 ), whereas lowering pressure surrounding the container ( 9 ) is performed by a vacuum pump ( 5 ). Leakage is detected by monitoring a pressure change in the surrounding of the container which is due to evaporation of liquid emerging from a leak and being evaporated in the low pressure surrounding.

Description

technical field [0001] The present invention generally relates to a method of testing at least one closed fill container for leaks and an apparatus for leak testing said container. Background technique [0002] According to the familiar leak detection technology, the closed container is placed in a test cavity, and after the test cavity is hermetically sealed, the pressure is reduced by an evacuation pump. If there is no leak in the container, then after the air pressure in the test cavity reaches a predetermined value, that is, after the air pressure measured around the container reaches a predetermined value, the air pressure value will remain substantially unchanged. If there is a leak somewhere in the container, and air collects there, that air will flow out of the container and increase the air pressure around the container. If the leak is in an area of ​​the container where the filling is collected, whether the leak will cause the air pressure around the container to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/32G01M1/00G01M3/00
CPCG01M3/329G01M3/007G01N2203/023G01N2203/0222G01N2203/0248
Inventor 马丁·莱曼
Owner WILCO AG