Title:
PHOTOELECTRIC SMOKE SENSOR
Document Type and Number:
WIPO Patent Application WO/2017/033499
Kind Code:
A1
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).
More Like This:
JPS5237084 | SMOKE DETECTOR |
Inventors:
IGUCHI MASAO (JP)
SHIBUYA TADAYUKI (JP)
NUMAO KANJI (JP)
MASUMOTO SHINTARO (JP)
SHIBUYA TADAYUKI (JP)
NUMAO KANJI (JP)
MASUMOTO SHINTARO (JP)
Application Number:
PCT/JP2016/063244
Publication Date:
March 02, 2017
Filing Date:
April 27, 2016
Export Citation:
Assignee:
FENWAL CONTROLS JAPAN LTD (JP)
International Classes:
G08B17/10; G08B17/107; G01N21/53
Foreign References:
JPH11167683A | 1999-06-22 | |||
JP2003141654A | 2003-05-16 | |||
JPH11312281A | 1999-11-09 |
Other References:
See also references of EP 3327688A4
Attorney, Agent or Firm:
S & S INTERNATIONAL PPC (JP)
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