JPS59174690U

JPS59174690U - Flame detector for automatic fire extinguishing system for kitchen fires

Info

Publication number: JPS59174690U
Application number: JP6807083U
Authority: JP
Inventors: 山岸　和生
Original assignee: ダイキン工業株式会社
Priority date: 1983-05-06
Filing date: 1983-05-06
Publication date: 1984-11-21
Also published as: JPH0241739Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来例を示す厨房火災用自動消火装置の全体概
略構成図、第２図ないし第７図は本考案の実施例を示し
、第２図は焦電型赤外センサの取付状態を示す図、第３
図は制御回路の内部構成を示すブロック図、第４図イ１
口およびハは焦電型赤外センサの出力信号の波形図、第
５図は帯域フィルタを通過したのちの焦電型赤外センサ
の出力信号の波形図、第６図イ〜トは非火災時における
制御回路各部の出力波形図、第７図イ〜トは火災時にお
ける第６図イ〜ト相当図である。１・・・ガスこんろ（厨房装置）、４・・・自動消火装
置ζ６・・・鍋、７・・・焦電型赤外センサ、１２・・
・帯域増幅回路（帯域フィルタ）、１３・・・整流回路
、１４・・・平滑回路、１５・・・しきい値設定回路、
１６・・・比較器、１７・・・タイマ回路。Fig. 1 is an overall schematic diagram of the conventional automatic fire extinguishing system for kitchen fires, Figs. 2 to 7 show embodiments of the present invention, and Fig. 2 shows how the pyroelectric infrared sensor is installed. Figure shown, 3rd
The figure is a block diagram showing the internal configuration of the control circuit.
Figure 5 is a waveform diagram of the output signal of the pyroelectric infrared sensor after passing through a bandpass filter, and Figure 6 is a waveform diagram of the output signal of the pyroelectric infrared sensor. The output waveform diagrams of various parts of the control circuit at the time of fire, FIG. 7 I to I are equivalent to FIG. 1... Gas stove (kitchen equipment), 4... Automatic fire extinguishing device ζ6... Pot, 7... Pyroelectric infrared sensor, 12...
・Band amplifier circuit (band filter), 13... Rectifier circuit, 14... Smoothing circuit, 15... Threshold setting circuit,
16... Comparator, 17... Timer circuit.

Claims

[Scope of utility model registration request]

It is arranged on the side of the kitchen device 1 to detect flames of a predetermined height or higher generated from the kitchen device 1, and outputs a fire signal when the flame reaches a predetermined height or higher. a pyroelectric infrared sensor 7 that outputs an extinguishing signal when reduced;
A bandpass filter 12 that filters the output signal of the pyroelectric infrared sensor 7 with a narrow bandwidth including the frequency of flame fluctuations, a rectifier circuit 13 that rectifies the output signal that has passed through the bandpass filter 12, and the rectifier. A smoothing circuit 14 smoothes the output signal of the circuit 13, and compares the output signal of the smoothing circuit 14 with a reference value, and outputs a count command signal when it is equal to or greater than the reference value, while outputting a reset signal when it is smaller than the reference value. A comparator 16, and a timer circuit that receives a count command signal from the comparator 16, counts a set time T, outputs a fire extinguishing command signal when the count is completed, and clears the count upon receiving a reset signal from the comparator 16. 17. A flame detector for an automatic fire extinguishing system for kitchen fires, characterized by comprising: