JPS6381595A - Ionization type sensor - Google Patents
Ionization type sensorInfo
- Publication number
- JPS6381595A JPS6381595A JP22685986A JP22685986A JPS6381595A JP S6381595 A JPS6381595 A JP S6381595A JP 22685986 A JP22685986 A JP 22685986A JP 22685986 A JP22685986 A JP 22685986A JP S6381595 A JPS6381595 A JP S6381595A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- accumulation
- smoke
- level
- smoke detection
- 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.)
- Pending
Links
- 239000000779 smoke Substances 0.000 claims description 65
- 238000009825 accumulation Methods 0.000 claims description 42
- 238000001514 detection method Methods 0.000 claims description 35
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 3
- 235000019504 cigarettes Nutrition 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000004397 blinking Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
Landscapes
- Fire-Detection Mechanisms (AREA)
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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 〔技術分野〕 本発明は、イオン化式感知器の改良に関する。[Detailed description of the invention] 〔Technical field〕 The present invention relates to improvements in ionization sensors.
イオン化式感知器は、イオン室内の′ｒ！ｌ＃電流（イ
オン電流）が煙の流入により減少して行く原理を利用し
て煙濃度を感知し火災警報を発生するように構成された
ものである。The ionization type sensor is inside the ion chamber. It is configured to detect smoke concentration and generate a fire alarm using the principle that l# current (ion current) decreases as smoke flows in.
例えば第７図に示すように、イオン化式感知器１００の
イオン室１００ａで煙濃度に応じたイオン電流を得て、
増幅器１００ｂで増幅して、コンデンサ１００ｃの出力
端に生じる煙検知信号ｖＯを取り出し、該検知信号Ｖｏ
とレベル判別回路２００の可変抵抗ＲＶで規定される実
火災の基準電圧Ｖ ＲＥＦとを比較器ＣＯＭＰで比較し
、例えばＶｏ ＜ ＶＲＥＦとなれば火災警報を発生さ
せる構成になっている。つまり第８図に示すように煙検
知信号Ｖｏが基準レベルＶ ＲＥＦに達した時に警報を
発生するようになっている。For example, as shown in FIG. 7, an ion current according to the smoke concentration is obtained in the ion chamber 100a of the ionization sensor 100,
The smoke detection signal vO generated at the output terminal of the capacitor 100c is amplified by the amplifier 100b, and the detection signal Vo
A comparator COMP compares the actual fire reference voltage V REF defined by the variable resistor RV of the level determination circuit 200, and if, for example, Vo < VREF, a fire alarm is generated. That is, as shown in FIG. 8, an alarm is generated when the smoke detection signal Vo reaches the reference level VREF.
ところが、このようなイオン化式煙感知器は、その原理
上実火災時以外にもタバコの煙や有機溶剤。However, in principle, such ionization type smoke detectors detect cigarette smoke and organic solvents in addition to actual fires.
電気ノイズなどの要因でイオン電流を減少させ火災警報
を発生することがあり、このため、従来よりなされてい
る対策のひとつに蓄積方式があるが、これは煙濃度が所
定のレベルに達した時に直ちに警報を発生せずに、煙濃
度が所定の時間継続して所定レベルに達していることを
判断した時に初めて火災警報を発生するようにしたもの
である。Factors such as electrical noise can reduce the ion current and generate a fire alarm, so one of the conventional countermeasures is the accumulation method. Rather than issuing an alarm immediately, a fire alarm is issued only when it is determined that the smoke concentration has continued to reach a predetermined level for a predetermined period of time.
しかしながら、このような蓄積方式は、一過性のノイズ
等に対してはある程度の有効性はあるものの、煙濃度が
急激に増大した実火災時にも蓄積動 。However, although this storage method is effective to some extent against transient noise, etc., it is also effective in the event of an actual fire where the smoke concentration increases rapidly.
作を行うために迅速性に欠ける嫌いがある。I don't like being quick enough to do my work.
本発明は、従来のイオン化式感知器が持つ上記のような
欠点を解消するために開発されたもので、煙濃度の比較
的低い時には蓄積動作を行うが、煙濃度が急激に増大し
た時には直ちに火災警報を発生するようにしたイオン化
式感知器を提供することを目的としている。The present invention was developed in order to eliminate the above-mentioned drawbacks of conventional ionization type detectors.It performs an accumulation operation when the smoke concentration is relatively low, but when the smoke concentration increases rapidly, it performs an accumulation operation. The object of the present invention is to provide an ionization type sensor that generates a fire alarm.
本発明は、上記目的を達成するため提案されるもので、
煙濃度に応じたレベルの煙検知信号を出力するイオン化
式煙検知回路、第１のレベル判別回路と蓄積回路より成
る煙濃度蓄積回路、第２のレベル判別回路を組合わせて
構成され、煙濃度蓄積回路では上記第１のレベル判別回
路により上記イオン化式煙検知回路の煙検知信号が所定
の煙濃度に相当するレベルに達した時に上記蓄積回路を
駆動して蓄積動作を開始し、この蓄積動作が予め設定さ
れた蓄積時間継続した時に警報信号を発生する構成とな
し、他方の第２のレベル判別回路では、イオン化式煙検
知回路からの煙検知信号が上記煙濃度蓄積回路の蓄積動
作を開始させる煙濃度よりも濃い濃度に相当するレベル
に達した時に直ちに警報信号を発生する構成になってい
る。The present invention is proposed to achieve the above objects,
It is constructed by combining an ionization type smoke detection circuit that outputs a smoke detection signal with a level corresponding to the smoke concentration, a smoke concentration accumulation circuit consisting of a first level discrimination circuit and an accumulation circuit, and a second level discrimination circuit. In the accumulation circuit, when the smoke detection signal of the ionization type smoke detection circuit reaches a level corresponding to a predetermined smoke concentration by the first level discrimination circuit, the accumulation circuit is driven to start the accumulation operation, and this accumulation operation is performed. The smoke detection signal from the ionization type smoke detection circuit starts the accumulation operation of the smoke concentration accumulation circuit in the other second level discrimination circuit. The structure is such that an alarm signal is immediately generated when the smoke concentration reaches a level corresponding to a higher concentration than the smoke concentration.
実施例
以下に、添付図を参照して本発明の一実施例を説明する
。Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.
第１図は本発明の基本的な構成を示すブロック図である
０本発明は、イオン化式煙検知回路１、煙濃度蓄積回路
２、第２のレベル判別回路３の３つの部分より構成され
ている。イオン化式煙検知回路１は、煙濃度に応じたレ
ベルの煙検知信号を電圧ＶＯとして出力し、煙濃度蓄積
回路２の第１のレベル判別回路２１が煙検知信号Ｖｏが
第１の基準レベルに達したことを判断すると、蓄積回路
２２を作動させて、煙検知信号Ｖｏを蓄積する。FIG. 1 is a block diagram showing the basic configuration of the present invention. The present invention is composed of three parts: an ionization type smoke detection circuit 1, a smoke concentration accumulation circuit 2, and a second level discrimination circuit 3. There is. The ionization type smoke detection circuit 1 outputs a smoke detection signal of a level corresponding to the smoke concentration as a voltage VO, and the first level discrimination circuit 21 of the smoke concentration accumulation circuit 2 determines that the smoke detection signal Vo has reached the first reference level. When it is determined that the smoke detection signal Vo is reached, the storage circuit 22 is activated to store the smoke detection signal Vo.
このようにして作動された蓄積回路２２は、煙検知信号
Ｖｏが第１の基準レベルに到達している間蓄積動作を続
け、予め設定された蓄積時間の間、煙検知信号を蓄積す
ると、警報信号を発生する構成となっている。一方、第
２のレベル判別回路３ではさらに煙濃度が高くなり上記
電圧Ｖｏが第２の基準レベルに達すると直ちに警報信号
を発生する構成とされている。The storage circuit 22 activated in this manner continues the storage operation while the smoke detection signal Vo reaches the first reference level, and when the smoke detection signal is stored for a preset storage time, an alarm is issued. It is configured to generate a signal. On the other hand, the second level discrimination circuit 3 is configured to generate an alarm signal as soon as the smoke concentration further increases and the voltage Vo reaches the second reference level.
第２図は本発明の構成を更に具体化した一実施例回路図
である。イオン化式煙検知回路１に設けられているイオ
ン室１０で検知された煙はイオン電流となり、増幅器１
１を介して煙検知信号Ｖ。FIG. 2 is a circuit diagram of an embodiment that further embodies the structure of the present invention. The smoke detected in the ion chamber 10 provided in the ionization type smoke detection circuit 1 becomes an ion current, and the amplifier 1
1 through the smoke detection signal V.
に増幅される。該信号Ｖｏが第１の基準レベル電圧ＶＩ
？ＥＰ１ （抵抗ＶＲＩにより設定される）に達すると
第１のレベル判別回路２１の比較器ＣＯＭＰ １がｒＨ
Ｊレベルの信号を出力し、ＮＡＮＤゲート２２ａを介し
てタイマ回路２２Ｃをスタートさせて蓄積動作を開始し
、タイマの設定時間経過後も上記第１レヘル電圧ＶＲＥ
ＦＩであれば、カウンタ２２ｂに歩進パルスを送出して
所謂蓄積動作を行い、カウンタ２２ｂの設定値、つまり
予め設定された蓄積時間ｔの経過後はＯＲゲートＯＲを
介して警報信号を送出する。また、上記煙検知信号Ｖｏ
が第２の基準レベル電圧ＶＲＥＦ２ （抵抗ＶＲ２によ
り設定される）に達すると第２のレベル判別回路３の比
較器ＣＯＭＰ２はｒＨＪレベルの信号を出力し、この時
にはすぐにＯＲゲー）ＯＲを介して警報信号を送出する
。is amplified. The signal Vo is the first reference level voltage VI
? When EP1 (set by the resistor VRI) is reached, the comparator COMP1 of the first level discrimination circuit 21 becomes rH.
A J level signal is output, and the timer circuit 22C is started via the NAND gate 22a to start the accumulation operation, and the first level voltage VRE is maintained even after the set time of the timer has elapsed.
If it is FI, a step pulse is sent to the counter 22b to perform a so-called accumulation operation, and after the set value of the counter 22b, that is, the preset accumulation time t has elapsed, an alarm signal is sent out via the OR gate OR. . In addition, the smoke detection signal Vo
When reaches the second reference level voltage VREF2 (set by the resistor VR2), the comparator COMP2 of the second level discrimination circuit 3 outputs a signal at the rHJ level, and at this time, it is immediately Send out an alarm signal.
第３図から第５図は、本発明の詳細な説明するものでイ
オン室で検出されるイオン電流を電圧に変換して得られ
た煙検知信号Ｖｏの変化にともなって、警報信号が送出
されるタイミングがどのようになるかを示したものであ
る。図より分かるように煙検知信号ＶＯが第１のレベル
判別回路２１の基準レベルＶＲＥＦＩに達すると、蓄積
動作が開始され、煙検知信号Ｖｏがこのようなレベルを
充たす限り蓄積回路２２による蓄積動作が継続され、蓄
積時間ｔに達すれば警報信号を送出する。また、蓄積時
間ｔの途中でも第４図に示すように、煙検知信号ＶＯの
レベルが第２のレベル判別回路３の基準レベルＶ ＲＥ
Ｆ２に達すればすぐに警報信号を送出することができる
。しかし、たばこの煙などの一過性ノイズに対しては第
５図に示すように、監視状態を維持し警報信号は送出さ
れないことになる。Figures 3 to 5 are detailed explanations of the present invention, in which an alarm signal is sent out in accordance with a change in the smoke detection signal Vo obtained by converting the ion current detected in the ion chamber into voltage. This shows what the timing will be like. As can be seen from the figure, when the smoke detection signal VO reaches the reference level VREFI of the first level discrimination circuit 21, the accumulation operation is started, and as long as the smoke detection signal Vo satisfies this level, the accumulation operation by the accumulation circuit 22 continues. This continues, and when the accumulation time t is reached, an alarm signal is sent out. Furthermore, even during the accumulation time t, as shown in FIG. 4, the level of the smoke detection signal VO reaches the reference level V RE of the second level discrimination circuit 3.
As soon as F2 is reached, an alarm signal can be sent out. However, for transient noise such as cigarette smoke, the monitoring state is maintained and no alarm signal is sent out, as shown in FIG.
なお、上記実施例ではイオン化式煙検知回路を煙濃度の
増大につれて煙検知信号レベルが低下する構成としたが
、逆に煙濃度の増大につれて煙検知信号レベルが増大す
る構成に対しても通用できることはいうまでもない。In the above embodiment, the ionization type smoke detection circuit is configured such that the smoke detection signal level decreases as the smoke concentration increases, but it can also be applied to a configuration in which the smoke detection signal level increases as the smoke concentration increases. Needless to say.
ところで、本発明においても採用されたような蓄積型の
煙感知器においては蓄積時間が正確に設定されている必
要があり、その点で蓄積時間の測定を正確に行う必要が
ある。このことは、蓄積型の光電式感知器においても同
様であり、次に蓄積時間の測定を容易に行う方法を提案
する。Incidentally, in a storage type smoke detector such as the one adopted in the present invention, the storage time must be set accurately, and in this respect, it is necessary to accurately measure the storage time. This also applies to storage type photoelectric sensors, and next we will propose a method for easily measuring storage time.
例えば、第６図は２色ＬＥＤを使用して、蓄積時間の測
定を行う場合の一例を示すものであり、まず、蓄積動作
時には、蓄積パルストランジスタ５のベースに送出され
るので、蓄積パルスが「Ｌ」レベルとなる毎にトランジ
スタ５が導通し、緑色のＬＥＤ６ｂが点滅する。For example, FIG. 6 shows an example of measuring the accumulation time using a two-color LED. First, during the accumulation operation, the accumulation pulse is sent to the base of the accumulation pulse transistor 5. Every time the level becomes "L", the transistor 5 becomes conductive and the green LED 6b blinks.
続いて、蓄積時間経過後には、感知器が動作し、この時
には、ＩＳＳ雑器動作時トリガパルスが５ＣＲ４のゲー
トに送られて５ＣＲ４がターンオンし、赤色ＬＥＤ６ａ
が点灯する。Subsequently, after the accumulation time has elapsed, the sensor operates, and at this time, the ISS miscellaneous device operation trigger pulse is sent to the gate of 5CR4, turning on 5CR4, and the red LED 6a is turned on.
lights up.
このようにここで提案するものでは、蓄積回路の蓄積開
始を緑色ＬＥＤ６ｂの点滅より確認でき、蓄積終了を赤
色ＬＥＤ６ａの点灯により確認できるので、蓄積開始信
号を感知器の消費電流の増加の形で外部に与え、この電
流を電流計で測定したり、外部に表示灯等を接続して該
表示灯等を点灯させて測定して従来の方法を比べて特別
な装置なしで容易に確認でき、現場点検そのものを手軽
で正確に行える。In this way, with the system proposed here, the start of accumulation in the accumulation circuit can be confirmed by blinking the green LED 6b, and the end of accumulation can be confirmed by lighting the red LED 6a, so the accumulation start signal can be transmitted in the form of an increase in the current consumption of the sensor. This current can be easily confirmed without any special equipment compared to conventional methods by applying the current to an external source and measuring this current with an ammeter, or by connecting an external indicator light or the like and turning on the indicator light. On-site inspections can be performed easily and accurately.
なお、抵抗７．８は、２色のＬＥＤ６の電流制限用に、
抵抗８は赤色のＬＥＤ６ａの断線時の動作確保用に設け
たものである。Note that the resistor 7.8 is used to limit the current of the two-color LED 6.
The resistor 8 is provided to ensure operation when the red LED 6a is disconnected.
本発明のイオン化式感知器によると、一過性の非火災報
要因を的確に排除することができ、また、実火災による
急激な煙濃度の増大に対しても時間遅れなく、即警報を
発することができる。According to the ionization type sensor of the present invention, it is possible to accurately eliminate temporary non-fire alarm factors, and also to issue an immediate alarm without any time delay even in the event of a sudden increase in smoke concentration due to an actual fire. be able to.
第１図は本発明のイオン化式感知器の基本的な構成を示
すブロック図、第２図はその一実施例の構成回路図、第
３図〜第５図は動作を説明する動作説明図、第６図は蓄
積型光電式感知器における２色の動作確認灯を使用した
蓄積時間測定回路の例図、第７図は従来のイオン化式感
知器の構成回路図、第８図はその動作を説明する動作説
明図を示している。
（符号の説明）
１・・・イオン化式煙検知回路
２・・・煙濃度蓄積回路
２１・・・第１のレベル判別回路
２２・・・蓄積回路
３・・・第２のレベル判別回路FIG. 1 is a block diagram showing the basic configuration of the ionization type sensor of the present invention, FIG. 2 is a configuration circuit diagram of one embodiment thereof, and FIGS. 3 to 5 are operation explanatory diagrams explaining the operation. Figure 6 is an example diagram of an accumulation time measuring circuit using two-color operation confirmation lights in an accumulation type photoelectric sensor, Figure 7 is a configuration circuit diagram of a conventional ionization type sensor, and Figure 8 shows its operation. An explanatory diagram of an operation to be explained is shown. (Explanation of symbols) 1... Ionization type smoke detection circuit 2... Smoke concentration accumulation circuit 21... First level discrimination circuit 22... Accumulation circuit 3... Second level discrimination circuit
Claims (1)
式煙検知回路、第１のレベル判別回路と蓄積回路を組合
わせて成り、上記第１のレベル判別回路により上記イオ
ン化式煙検知回路の煙検知信号が所定の煙濃度に相当す
るレベルに達した時に上記蓄積回路を作動して蓄積動作
を開始し、この蓄積動作が予め設定された蓄積時間継続
した時に警報信号を発生する煙濃度蓄積回路、及び上記
イオン化式煙検知回路からの煙検知信号が上記煙濃度蓄
積回路の蓄積動作を開始させる煙濃度よりも濃い濃度に
相当するレベルに達した時に警報信号を発生する第２の
レベル判別回路を備えたことを特徴とするイオン化式感
知器。It consists of a combination of an ionization type smoke detection circuit that outputs a smoke detection signal of a level corresponding to smoke concentration, a first level discrimination circuit, and an accumulation circuit, and the first level discrimination circuit outputs a smoke detection signal of the ionization type smoke detection circuit. A smoke concentration accumulation circuit that activates the accumulation circuit to start accumulation operation when the detection signal reaches a level corresponding to a predetermined smoke concentration, and generates an alarm signal when this accumulation operation continues for a preset accumulation time. , and a second level discrimination circuit that generates an alarm signal when the smoke detection signal from the ionization type smoke detection circuit reaches a level corresponding to a higher smoke concentration than the smoke concentration that starts the accumulation operation of the smoke concentration accumulation circuit. An ionization type sensor characterized by being equipped with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22685986A JPS6381595A (en) | 1986-09-25 | 1986-09-25 | Ionization type sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22685986A JPS6381595A (en) | 1986-09-25 | 1986-09-25 | Ionization type sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6381595A true JPS6381595A (en) | 1988-04-12 |
Family
ID=16851688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22685986A Pending JPS6381595A (en) | 1986-09-25 | 1986-09-25 | Ionization type sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6381595A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6747395B1 (en) | 1998-11-02 | 2004-06-08 | Matsushita Electric Industrial Co., Ltd. | Piezoelectric loudspeaker |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5657951A (en) * | 1979-10-16 | 1981-05-20 | Nittan Co Ltd | Ionization smoke detector |
-
1986
- 1986-09-25 JP JP22685986A patent/JPS6381595A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5657951A (en) * | 1979-10-16 | 1981-05-20 | Nittan Co Ltd | Ionization smoke detector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6747395B1 (en) | 1998-11-02 | 2004-06-08 | Matsushita Electric Industrial Co., Ltd. | Piezoelectric loudspeaker |
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