Method of depolluting a helium leak detector and apparatus implementing the method
US4606221A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1985 |
| Grant date | Aug 19, 1986 |
| Priority date | — |
| Expiry date | Mar 20, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/202
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of de-polluting a helium leak detector in which a pumping station and a gas analyzer (5) connected to the pumping station via an air inlet duct provided with an insertion valve (6). The pumping station comprises a sliding vane rotary vacuum pump (1) comprising a rotor (7) and a stator (8). The assembly is placed in a sump partially filled with oil (10). A suction duct (11) connects the interior of the stator to the exterior of the sump connects exhaust channel (12) connecting the interior of the stator to the interior of the sump which is in communication with the exterior via a point (14) of the sump which is situated above the oil level. The pumping station further includes a link duct (15) having a fastening (4) for connection to an apparatus to be tested at one end and having its other end connected to the suction duct via a pump isolating valve (2). An air inlet valve (3) is placed in addition on a duct having one end which is open to the exterior and whose other end is connected to the link duct (15) between the connection fastening (4) and the isolating valve (2). With the insertion valve (6) closed, the air contained in the free space in the sump above the oil leve…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.