COMPOSITE ALARM FOR LEAKED FIRE GAS

摘要

PROBLEM TO BE SOLVED: To secure prescribed sound pressure even if there is a space between a main body unit and cover sound holes. SOLUTION: The composite alarm for leakage fire gas is equipped with the main body unit 1 which is freely attached to and detached from a fitting part such as a ceiling surface, a smoke detection unit 2 which is mounted in the center of the lower part of the main body unit 1, and a cover 3 which is mounted covering the lower outside while the smoke detection unit 2 is mounted on the main body unit 1. A loudspeaker is mounted in a loudspeaker opening part 9 on the lower surface of the main body unit 1 and semicylinders 12 and 11 are provided inside the smoke detection unit 2 and cover 3 facing the loudspeaker opening part 9 and the semicylinders form a cylindrical sound duct 10 extending from the loudspeaker opening part to the cover sound holes 6 in a state where the semicylinders are assembled.