Photoelectric smoke detector
US10054542B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2016 |
| Grant date | Aug 21, 2018 |
| Priority date | — |
| Expiry date | Jun 23, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/113
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Provided is an explosion-proofed photoelectric smoke detector capable of preventing the surrounding gas from taking fire generated by an explosion inside it and of eliminating filling spaces around a light-emitting device and a light-receiving device with resin, thereby checking explosions due to deterioration of the resin, which enables the detector to be used, with the devices exposed to gases in explosion-proof zones. The light emitting/receiving devices are arranged outside of an explosion-proof enclosure having a circuit compartment. They respectively have hollow cylinders A and B, light emitting/receiving elements, and light-guiding members A and B for transmitting emitted light and guiding received light, wherein a gap between the tube wall of each hollow cylinder and each light-guiding member and a length of each member between an opening formed in each cylinder and a light exiting/entering end thereof enable the devices to prevent fire generated inside the detector from leaking out thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.