JPS6123785Y2 - - Google Patents

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Publication number
JPS6123785Y2
JPS6123785Y2 JP1985073400U JP7340085U JPS6123785Y2 JP S6123785 Y2 JPS6123785 Y2 JP S6123785Y2 JP 1985073400 U JP1985073400 U JP 1985073400U JP 7340085 U JP7340085 U JP 7340085U JP S6123785 Y2 JPS6123785 Y2 JP S6123785Y2
Authority
JP
Japan
Prior art keywords
output
pulse
photoreceptor
generation source
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP1985073400U
Other languages
Japanese (ja)
Other versions
JPS6151U (en
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP7340085U priority Critical patent/JPS6151U/en
Publication of JPS6151U publication Critical patent/JPS6151U/en
Application granted granted Critical
Publication of JPS6123785Y2 publication Critical patent/JPS6123785Y2/ja
Granted legal-status Critical Current

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  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)

Description

【考案の詳細な説明】[Detailed explanation of the idea]

本考案は喫煙排気或は微塵含有流体等、本来の
出火発煙とは異るフローパターンに着目した誤報
知を回避し得る光電式煙検出報知装置に関する。 一般に出火の初期段階における発煙気体をチヤ
ンバ内に導入して発光体の照射光束を遮つたこと
を受光体の感応によつて検知する光電式火災検出
装置にあつては、煙粒子を含む気体を開口部を通
して暗箱内に導入できるようなチヤンバが用いら
れ、受光体の感応出力を一旦増幅して警報回路に
導く構成をとつている。ところで検知回路の感度
は普通、増幅器の利得調整で加減できるが、上記
チヤンバ内へ流入する流体のフローパターンが室
内における喫煙による場合、或は微細塵埃を含む
流体の場合には、出火に伴ない連続的に拡散、蔓
延し気体中の煙濃度が逐次上昇するのとその状態
が異るにも拘わらず、検知回路を一律に高感度設
定してあれば火災によらない流体のフローを検出
して誤報送出の原因を生むことになる。又上記誤
報の一因としては上記チヤンバ内での反射散乱光
又は外来散乱光による場合があるが、これは煙気
体のチヤンバ内への導入の容易性と散乱防止の構
造に関連するとともに検知回路の感度とSN比と
の要素にも拘わつている。 本考案は検知せんとする火災発煙流体のフロー
パターンに基いて、捕集チヤンバの構造に拘わら
ず一定基準以上の検出レベルに達したときにパル
ス発光に同期し且つ連続して2回以上の検出信号
が送出されたときにはじめて警報できる煙検出報
知装置を提供するにある。以下図面に基き本考案
の一実施例について詳述する。 先づ第1図は本考案の総合ブロツク結線図で、
発光体Lは光線ビームを一定周期でパルス状に発
射させるためにパルス発生源PGに接続され、チ
ヤンバCB内への煙流体SAの流入に伴う受光体R
の感応出力を利得調整機能付増幅器AMPに加え
る。DELは上記光線ビームの発光周期、すなわ
The present invention relates to a photoelectric smoke detection and notification device that can avoid false alarms by focusing on a flow pattern different from the original ignition and smoke emission, such as smoking exhaust or fluid containing fine dust. Generally, in the case of photoelectric fire detection devices, which use a photoreceptor to detect when smoke gas is introduced into the chamber at the initial stage of a fire and interrupts the irradiation beam of a light emitter, it is possible to detect gas containing smoke particles. A chamber is used that can be introduced into the dark box through an opening, and is configured to amplify the sensitive output of the photoreceptor and guide it to the alarm circuit. By the way, the sensitivity of the detection circuit can usually be adjusted by adjusting the gain of the amplifier, but if the flow pattern of the fluid flowing into the chamber is due to smoking indoors, or if the fluid contains fine dust, it may be affected by the outbreak of a fire. Even though the situation is different from that of continuous diffusion and spread, and the smoke concentration in the gas gradually increases, if the detection circuit is uniformly set to high sensitivity, it will be possible to detect a fluid flow that is not caused by a fire. This may cause false alarms to be sent out. In addition, one of the causes of the above-mentioned false alarm may be reflected scattered light within the chamber or external scattered light, but this is related to the ease of introducing smoke gas into the chamber and the structure to prevent scattering, as well as the detection circuit. It also concerns the factors of sensitivity and signal-to-noise ratio. Based on the flow pattern of the fire-smoking fluid to be detected, the present invention detects two or more consecutive times in synchronization with pulsed light emission when a detection level exceeding a certain standard is reached, regardless of the structure of the collection chamber. To provide a smoke detection and alarm device capable of issuing an alarm only when a signal is sent out. An embodiment of the present invention will be described in detail below based on the drawings. First of all, Figure 1 is a comprehensive block wiring diagram of this invention.
The light emitter L is connected to a pulse generation source PG to emit a light beam in a pulsed manner at a constant period, and the light receiver R is connected to a pulse generation source PG to emit a light beam in a pulsed manner at a constant period.
Add the sensitive output to the amplifier AMP with gain adjustment function. DEL is the emission period of the above light beam, i.e.

【表】 Fはゲート回路からの検出パルスを計数するフ
リツプフロツプと、そのカウント数を判別するゲ
ートとを内蔵した一致カウンタであり、予定の検
出パルス数nが計数されたときにはじめて一致出
力を送出するものである。この一致カウンタはセ
ツト端子1とリセツト端子2とを入力端子とし
て、その出力端子Eから報知手段ALに検出信号
が加えられ、セツト端子1とリセツト端子2とは
上記ゲート回路の出力端子C,Dからそれぞれ信
号を受ける。ここに第2図について説明すると、
同図aは煙感知チヤンバ内に導入される前の流体
濃度分布を表わし、AF1〜AF3は喫煙排気等脈
動して不規則に変動して検出回路として一定の基
準レベルEBを越えるピーク値も顕われているの
に対して、火災の発生に伴つて立昇る煙気体SA
は時間の経過とともにその濃度が連続的に高ま
り、当然検出レベルを上回つたフローパターンを
呈している。同図bはパルス発生源PGにより一
定周期で繰返し駆動されるパルス発光の連続パル
スグラフで受光体はこの発光パルスに若干遅れて
徐々に受光出力を送出している。同図cは前記流
体のフローパターンの検出レベルを越えた時点に
おいて同図bのパルス送出期間より若干遅れた検
出パルスのグラフであつて、K1,K3は断続1回
の検知出力が顕われることを、又K7〜K9は本実
施例においては連続3回検出パルスを送出するこ
とを顕わしている。従つて検出パルス1回のみの
送出では警報手段に報知信号を送出せず、少くと
も2回以上連続して検出パルスが送出されたとき
にはじめて煙流体が検知されたことを報知する信
号SGが同図dのように一致カウンタの出力端子
から送出される。この警報送出期間即ち一致カウ
ンタの出力端Eに論理信号“1”の顕われる期間
は前記パルス発生源のクロツクパルス送出周期に
上記煙検出パルスの送出回数m(ただしm>nで
あり、この実施例ではn=2)を乗じたm倍期間
継続する。 以上、説明した通り、本考案は本来の火災によ
る発煙流体の検知に当つて一定の検出基準レベル
を設定してしかも連続して検出パルスが送出され
ない限じ報知指令を出さない構成であるため、一
般の気流体と簡便に分別できる結果、誤報により
惑わされる機会を極力少くすることができる。
又、実在する煙による真の情報と誤認情報とが発
光期間中に重複するチヤンスはきわめて少ない確
率でしか起こらず、希であるため、気体流入を容
易にするチヤンバ構造をとる方が有利である。す
なわち、外来光または誘導性サージによる誤情報
の原因となる騒乱に対しては、検出回路への保護
手段の付加と、チヤンバ内での受光体の配置また
は散乱光の減殺構造によつて防圧できるからであ
る。さらに、可変利得増幅器の感度を一々調整し
直す煩わしさもなく、チヤンバ内での散乱光によ
る影響を無視できる程度に抑えることによつて、
煙流体と一般気体とのフローパターンに基づいた
分別のみで一元的に検知回路の特性を設定するこ
とが可能になる実益を有する。
[Table] F is a coincidence counter that has a built-in flip-flop that counts the detection pulses from the gate circuit and a gate that determines the count, and sends out a coincidence output for the first time when the planned number of detection pulses n has been counted. It is something to do. This coincidence counter has a set terminal 1 and a reset terminal 2 as input terminals, and a detection signal is applied from its output terminal E to the notification means AL. receive signals from each. To explain Figure 2 here,
Figure a shows the fluid concentration distribution before it is introduced into the smoke detection chamber, and AF1 to AF3 fluctuate irregularly due to pulsations such as smoking exhaust, and as a detection circuit, there are peak values that exceed a certain reference level E B. In contrast, the smoke gas that rises as a result of a fire
As time passes, its concentration increases continuously, naturally exhibiting a flow pattern that exceeds the detection level. Figure b is a continuous pulse graph of pulsed light emission that is repeatedly driven at a constant period by the pulse generation source PG, and the photoreceptor gradually sends out a light reception output with a slight delay to this light emission pulse. Figure c is a graph of a detected pulse that is slightly delayed from the pulse sending period of figure b at the time when the fluid flow pattern exceeds the detection level, and K 1 and K 3 are graphs where one intermittent detection output is noticeable. In addition, K7 to K9 indicate that the detection pulses are sent out three times in succession in this embodiment. Therefore, sending out only one detection pulse does not send a notification signal to the alarm means, and it is not until the detection pulse is sent out at least two times in succession that the signal SG notifying that smoke fluid has been detected is generated. The signal is sent from the output terminal of the coincidence counter as shown in d of the same figure. This alarm sending period, ie, the period during which the logic signal "1" appears at the output terminal E of the coincidence counter, is the number of times the smoke detection pulse is sent out during the clock pulse sending period of the pulse generation source (where m>n, and in this embodiment Then, it continues for m times the period multiplied by n=2). As explained above, the present invention has a configuration in which a certain detection standard level is set when detecting smoking fluid due to a fire, and an alarm command is not issued unless a detection pulse is continuously sent out. Since it can be easily separated from ordinary air and fluids, the chances of being misled by false alarms can be minimized.
In addition, since the chance that true information and false information due to actual smoke overlap during the emission period occurs with an extremely low probability and is rare, it is advantageous to adopt a chamber structure that facilitates gas inflow. . In other words, disturbances that cause false information due to external light or induced surges can be prevented by adding protection to the detection circuit, placing a photoreceptor in the chamber, or using a structure to reduce scattered light. Because you can. Furthermore, there is no need to readjust the sensitivity of the variable gain amplifier one by one, and the influence of scattered light within the chamber is suppressed to a negligible level.
This has the practical benefit of making it possible to centrally set the characteristics of the detection circuit only by classifying smoke fluid and general gas based on their flow patterns.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本考案の一実施例における回路結線
図、第2図は第1図回路に関する各部の状態を示
すグラフである。 PG……パルス発生源、L……発光体、R……
受光体、DEL……遅延回路、AMP……可変利得
増幅器、G……レベル比較器付ゲート回路、F…
…一致カウンタ。
FIG. 1 is a circuit connection diagram in an embodiment of the present invention, and FIG. 2 is a graph showing the state of each part related to the circuit shown in FIG. PG...Pulse source, L...Light emitter, R...
Photoreceptor, DEL...Delay circuit, AMP...Variable gain amplifier, G...Gate circuit with level comparator, F...
...match counter.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] パルス発生源により間欠発光させた照射光束が
火災発煙流体のチヤンバ内への導入により散乱せ
しめられたことを受光体が検出する煙感知回路に
おいて、上記間欠発光光束に若干遅れて感応する
受光体の受光出力を受ける可変利得増幅器と、一
定レベルをこえる上記増幅器のパルス出力と上記
パルス発生源からのクロツクパルスを遅延回路に
より上記受光体が感応するまでの遅延時間に相当
する時間だけ遅延させた遅延出力とがともに入力
されたとき1つの論理出力を送出するレベル比較
器付ゲート回路と、上記ゲート回路の出力を計数
するフリツプフロツプを含む一致カウンタとを備
え、上記ゲート回路の出力が少なくとも連続n回
以上のm回あるときにのみ上記パルス発生源のク
ロツクパルス周期のm倍期間警報を発するように
したことを特徴とする光電式煙検出報知装置。
In a smoke detection circuit in which a photoreceptor detects that the irradiation light beam intermittently emitted by a pulse generation source has been scattered by the introduction of fire-smoking fluid into the chamber, the photoreceptor is sensitive to the intermittent emitted light beam with a slight delay. A variable gain amplifier that receives the received light output, and a delayed output in which the pulse output of the amplifier that exceeds a certain level and the clock pulse from the pulse generation source are delayed by a delay circuit by a time corresponding to the delay time until the photoreceptor is sensitive. comprises a gate circuit with a level comparator that outputs one logic output when both are input, and a coincidence counter including a flip-flop that counts the output of the gate circuit, and the output of the gate circuit is at least n consecutive times. 1. A photoelectric smoke detection and notification device, characterized in that an alarm is issued for a period m times the clock pulse period of the pulse generation source only when m times.
JP7340085U 1985-05-17 1985-05-17 Photoelectric smoke detection alarm device Granted JPS6151U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7340085U JPS6151U (en) 1985-05-17 1985-05-17 Photoelectric smoke detection alarm device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7340085U JPS6151U (en) 1985-05-17 1985-05-17 Photoelectric smoke detection alarm device

Publications (2)

Publication Number Publication Date
JPS6151U JPS6151U (en) 1986-01-06
JPS6123785Y2 true JPS6123785Y2 (en) 1986-07-16

Family

ID=30612728

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7340085U Granted JPS6151U (en) 1985-05-17 1985-05-17 Photoelectric smoke detection alarm device

Country Status (1)

Country Link
JP (1) JPS6151U (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50114275A (en) * 1973-11-26 1975-09-08
JPS53143287A (en) * 1977-05-19 1978-12-13 Nittan Co Ltd Photoelectric smoke detector
JPS5410757B2 (en) * 1972-05-16 1979-05-09

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5410757U (en) * 1977-06-24 1979-01-24

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5410757B2 (en) * 1972-05-16 1979-05-09
JPS50114275A (en) * 1973-11-26 1975-09-08
JPS53143287A (en) * 1977-05-19 1978-12-13 Nittan Co Ltd Photoelectric smoke detector

Also Published As

Publication number Publication date
JPS6151U (en) 1986-01-06

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