Evaporation closed chamber for detecting hazardous substance
US11448573B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Aug 2, 2018 |
| Grant date | Sep 20, 2022 |
| Priority date | — |
| Expiry date | Oct 17, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2001/4027
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An evaporation closed chamber for detecting hazardous substance, having a closed chamber, an orifice plate, a pressure plate, a drive device and an elastic film, the orifice plate is mounted on any surface(s) of the closed chamber, the elastic film is arranged on the outer side of the orifice plate, the pressure plate is arranged on the outer side of the elastic film, and the drive device is in transmission connection with the pressure plate to drive the pressure plate to move forwards and backwards to press the elastic film against the orifice plate. The elastic film expands with the increase of internal temperature of the closed chamber and shrinks with the temperature decrease of the closed chamber such that the gas in the closed chamber can be timely compensated; the orifice plate prevents hazardous substance from leaving on the gas compensation device to influence test accuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.