OPTICAL ELECTRIC FIRE-SMOKE DETECTOR Russian patent published in 2012 - IPC G08B17/10 

FIELD: fire-fighting.

SUBSTANCE: device comprises a housing having a detachable connection with the basis on which electrical contacts are fixed, and printed circuit board with elements of electronic circuits placed in the housing, and an optical chamber containing an optically isolated from each other modules of light emitter and light detector mounted on the printed circuit board and not connected rigidly with the optical chamber. The measuring volume is formed by the surface of the printed circuit board and a removable cover of the optical chamber mounted it on, which is designed as a limiting element with smoke-intake windows and a central hood, coupled with a coaxial cylindrical shells embedded and interconnected with radial ridges, which smoke-intake windows are connected to the smoke-intake windows of the bounding element and the measuring volume of labyrinth channels formed by radial ridges between the cylindrical shells, and excluding direct sunlight from outside into the measuring volume. The light emitter and light detector modules installed in the appropriate places in the printed circuit board, are located between the box-shaped enclosure of the bottom part of the outer cylindrical shell of the removable cover and the corresponding aperture of its inner cylindrical shell.

EFFECT: creation of compact, high-tech detector with high sensitivity of smoke detection in the early stages of a fire and convenient preventive maintenance.

6 cl, 5 dwg