Leakage test method and apparatus
US4993256A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 19, 1989 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Apr 19, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/3236
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In order to accurately conduct a leakage test in a short time, an initial pressure higher than a test pressure is first supplied into a hollow object to be tested. Then, part of the pressure within the object is relieved to decrease the temperature within the object to the ambient temperature so that the pressure within the object can be stabilized at the test pressure. Then, a variation in the pressure within the object is detected to determine whether there is any leakage in the object. In the case where a negative pressure is utilized, an initial pressure lower than the test pressure is first supplied into the object, and then part of the pressure within the object is relieved by introducing the ambient air into the object, to increase the temperature within the object to the ambient temperature so that the pressure within the object can be stabilized at the test pressure. Then, a variation in the pressure within the object is detected to determine whether there is any leakage in the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.