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1. (WO2017033499) PHOTOELECTRIC SMOKE SENSOR

Pub. No.:    WO/2017/033499    International Application No.:    PCT/JP2016/063244
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Thu Apr 28 01:59:59 CEST 2016
IPC: G08B 17/10
G08B 17/107
G01N 21/53
Applicants: FENWAL CONTROLS OF JAPAN, LTD.
日本フェンオール株式会社
Inventors: IGUCHI, Masao
井口 雅雄
SHIBUYA, Tadayuki
渋谷 忠之
NUMAO, Kanji
沼尾 寛伺
MASUMOTO, Shintaro
舛本 慎太郎
Title: PHOTOELECTRIC SMOKE SENSOR
Abstract:
A photoelectric smoke sensor (1) is provided with: a casing (3) of an explosion-proof structure type having a circuit housing chamber (18) that houses a circuit board (20); an inflow chamber (45) that is provided to the casing (3) and that is communicably connected to an explosion-proof designated zone (z); a light emitting unit (55) provided to the inflow chamber (45); and a light receiving unit (56) provided to the inflow chamber (45). The light emitting unit (55) includes: a first light guide body (59) that guides light emitted from a light emitting element (58) to the inflow chamber (45); and a first support part (57) that surrounds and holds the first light guide body (59) and that is communicably connected to the circuit housing chamber (18). The light receiving unit (56) includes: a second light guide body (79) that receives the light emitted from the light emitting element (58) in the inflow chamber (45) and guides the light to a light receiving element (78); and a second support part (77) that surrounds and holds the second light guide body (79) and that is communicably connected to the circuit housing chamber (18). The first support part (57) and the second support part (77) are configured so as to prevent escape of a flame spouting from the circuit housing chamber (18) to the inflow chamber (45).