Title:
FIRE DETECTING DEVICE
Document Type and Number:
Japanese Patent JP3051513
Kind Code:
B
Abstract:
PURPOSE: To discover fire at an early stage and also to suppress erroneous information to a min. by detecting hydrocarbon gas generated at an extremely early stage of fire before flame is generated and detecting the increase of radiation heat caused by means of heat generation response due to combustion.
CONSTITUTION: A pre-alarm judging part 4 judges the detection of hydrocarbon gas by a hydrocarbon gas sensor 1 and permits a pre-alarm output part 5 to output pre-alarm is a fire alarming device 3. The pre-alarm judging part 4 sets a pre-alarm flag on for a fire judging part 6 at the time of judging the detection of hydrocarbon gas. The fire judging part 6 judges the strength of radiation heat detected by a heat ray sensor 2 and judges fire by continuously obtaining the increase of radiation heat after the detection by hydrocarbon gas when the strength of radiation heat detected by the heat ray sensor 2 exceeds a threshold in a state where the pre-alarm flag is set on by the pre- alarm judging part 4. Then, a fire alarm part 7 is made to output fire alarm.
Inventors:
Kaji, Yukiko
Kubo, Tetsuya
Otani, Shigeru
Kubo, Tetsuya
Otani, Shigeru
Application Number:
JP1991000247215
Publication Date:
March 31, 2000
Filing Date:
September 26, 1991
Export Citation:
Assignee:
HOCHIKI CORP
International Classes:
B23K26/00; B21G1/02; B23K26/38; (IPC1-7): G08B17/117; G01N27/00; G01N27/62; G08B17/06; G08B17/12
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