JP2007316765A - Combined type fire alarm - Google Patents

Combined type fire alarm Download PDF

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JP2007316765A
JP2007316765A JP2006143180A JP2006143180A JP2007316765A JP 2007316765 A JP2007316765 A JP 2007316765A JP 2006143180 A JP2006143180 A JP 2006143180A JP 2006143180 A JP2006143180 A JP 2006143180A JP 2007316765 A JP2007316765 A JP 2007316765A
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concentration
fire alarm
accumulation time
smoke
alarm
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JP4810309B2 (en
Inventor
Yasunao Komatsu
泰直 小松
Tatsuo Fujimoto
龍雄 藤本
Kazuyoshi Honda
一賀 本多
Toshiyuki Doi
敏行 土井
Hironori Horigome
宏則 堀米
Hiroshi Kasahara
浩 笠原
Mitsuteru Nishida
光輝 西田
Yoshinori Nishigami
佳典 西上
Shuhei Kuroda
修平 黒田
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New Cosmos Electric Co Ltd
Tokyo Gas Co Ltd
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New Cosmos Electric Co Ltd
Tokyo Gas Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined type fire alarm for preventing erroneous report, and for announcing fire alarm in an early stage. <P>SOLUTION: This combined type fire alarm is provided with: a smoke detection part for detecting smoke; a CO detection part for detecting CO; and a control part for measuring a storage time T1 when smoke density based on output detected by the smoke detection part turned to an alarm level as the reference of fire alarm or more, and for controlling the fire alarm issue fire alarm after the lapse of the storage time T1 when the smoke density which is the alarm level or more is continuously detected by the smoke detection part during the lapse of the storage time T1. The control part issues fire alarm in the more early stage than the case that the storage time T passes when CO density based on the output detected by the CO detection part reaches the predetermined density or more during the measurement of the storage time T1. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

本発明は、煙を検知する煙検知部と、ＣＯを検知するＣＯ検知部と、前記煙検知部が検知した出力に基づく煙濃度が、火災警報の基準となる警報レベル以上となったときに蓄積時間を計測すると共に、前記蓄積時間が経過する間に前記煙検知部が前記警報レベル以上の煙濃度を継続して検知した場合、前記蓄積時間の経過後に火災警報を発するように制御する制御部と、を備えた複合型火災警報器に関する。   The present invention relates to a smoke detection unit for detecting smoke, a CO detection unit for detecting CO, and a smoke concentration based on an output detected by the smoke detection unit is equal to or higher than an alarm level serving as a fire alarm reference. Control for measuring the accumulation time and controlling so that a fire alarm is issued after the accumulation time elapses when the smoke detection unit continuously detects the smoke concentration above the alarm level while the accumulation time elapses And a combined fire alarm.

従来、火災警報器において、煙等の検知レベルが予め設定されている警報レベルに達すると蓄積時間を計測し、その計測が終了時点での検知レベルにより警報を発するか否かを判断するシステムが知られていた（例えば特許文献１）。この火災警報器は、煙と温度とを検知する複合型火災警報器である。複合型火災警報器としては、他に、煙と一酸化炭素（ＣＯ）とを検知するものが公知である。   Conventionally, in fire alarms, when the detection level of smoke or the like reaches a preset alarm level, the accumulation time is measured, and a system for determining whether or not to issue an alarm based on the detection level at the end of the measurement It was known (for example, Patent Document 1). This fire alarm is a combined fire alarm that detects smoke and temperature. Other known composite fire alarms are those that detect smoke and carbon monoxide (CO).

蓄積時間は、火災と非火災とを区別するために設定される。例えば、調理やタバコ等により一時的に発生した煙を火災警報器が検知する場合がある。このとき、一定レベル以上の濃度の煙を検知した時点で火災警報を報知すると誤報となる。このような事態を回避するため、火災警報器が火災警報の基準となる警報レベル以上の濃度の煙等を検知したときであっても、予め設定した時間（蓄積時間）だけ火災警報の報知をしない待機状態を設定する。
通常、調理やタバコ等に起因する煙は一時的なものであるため、蓄積時間が経過する間に煙濃度のレベルは低下する。即ち、一定レベル以上の濃度の煙を検知した場合であっても短時間で煙濃度が低下する場合があるため、蓄積時間を設定しておく。
そして、この蓄積時間を計測する間に警報レベル以上の煙濃度を維持すれば、蓄積時間の計測が終了したときに火災警報を報知する。これにより、誤報を未然に防止できる。 The accumulation time is set to distinguish between fire and non-fire. For example, a fire alarm may detect smoke temporarily generated by cooking or cigarettes. At this time, if a fire alarm is notified when smoke having a certain level or more is detected, a false alarm is generated. In order to avoid such a situation, even when the fire alarm detects smoke with a concentration higher than the alarm level that is the standard for fire alarm, the fire alarm is notified for a preset time (accumulation time). Set the standby state to not.
Usually, smoke resulting from cooking, cigarettes, and the like is temporary, so the level of smoke concentration decreases as the accumulation time elapses. In other words, even when smoke having a concentration higher than a certain level is detected, the smoke concentration may be reduced in a short time, so the accumulation time is set.
If the smoke concentration equal to or higher than the alarm level is maintained during the measurement of the accumulation time, a fire alarm is notified when the accumulation time measurement is completed. As a result, false alarms can be prevented.

特開平７−１８２５７３号公報JP-A-7-182573

例えば布団等がくすぶる燻焼火災では煙とＣＯが発生しており、不完全燃焼によってＣＯの濃度が急激に増加することがある。仮に、煙濃度が警報レベルに達しており、かつ、蓄積時間を計測しているときにＣＯ濃度が急上昇して確実に火災と判断できる場合であっても、蓄積時間の計測が終了するまで火災警報の報知ができない。そのため、設定した蓄積時間の分だけ火災警報の報知が遅れる。不完全燃焼を伴う火災では、ＣＯ中毒の虞があるため、できるだけ早期に火災警報を報知することが望ましい。   For example, smoke and CO are generated in a smoldering fire with smoldering futons, and the concentration of CO may increase rapidly due to incomplete combustion. Even if the smoke concentration has reached the alarm level and the CO concentration has risen rapidly when measuring the accumulation time and it can be reliably determined that there is a fire, the fire will continue until the accumulation time measurement is completed. The alarm cannot be reported. Therefore, the fire alarm notification is delayed by the set accumulation time. In a fire with incomplete combustion, there is a risk of CO poisoning, so it is desirable to notify a fire alarm as early as possible.

従って、本発明の目的は、誤報を未然に防止でき、かつ、早期に火災警報を報知できる複合型火災警報器を提供することにある。   Accordingly, it is an object of the present invention to provide a composite fire alarm that can prevent false alarms and can promptly notify a fire alarm.

上記目的を達成するための本発明に係る複合型火災警報器は、煙を検知する煙検知部と、ＣＯを検知するＣＯ検知部と、前記煙検知部が検知した出力に基づく煙濃度が、火災警報の基準となる警報レベル以上となったときに蓄積時間を計測すると共に、前記蓄積時間が経過する間に前記煙検知部が前記警報レベル以上の煙濃度を継続して検知した場合、前記蓄積時間の経過後に火災警報を発するように制御する制御部と、を備えた複合型火災警報器において、その第一特徴構成は、前記制御部が、前記蓄積時間の計測中に、前記ＣＯ検知部が検知した出力に基づくＣＯ濃度が所定濃度以上に達すると、前記蓄積時間が経過する時より早期に火災警報を発する点にある。   In order to achieve the above object, the composite fire alarm according to the present invention includes a smoke detector that detects smoke, a CO detector that detects CO, and a smoke concentration based on the output detected by the smoke detector, When the accumulation time is measured when the alarm level becomes a fire alarm standard or more, and when the smoke detector continuously detects the smoke concentration above the alarm level during the accumulation time, And a control unit that controls to issue a fire alarm after the accumulation time has elapsed. The first feature of the composite fire alarm is that the control unit detects the CO detection during the accumulation time measurement. When the CO concentration based on the output detected by the unit reaches a predetermined concentration or more, a fire alarm is issued earlier than when the accumulation time elapses.

本構成によれば、蓄積時間を設定して誤報を未然に防止できると共に、高ＣＯ濃度で確実に火災と判断できる場合やＣＯ中毒を引き起こす可能性がある場合には、蓄積時間の完了を待つことなく火災警報を発することができる。
従って、本発明では、火災か非火災であるかの判断が難しい場合でも、不完全燃焼に伴う高ＣＯ濃度を検出することで火災と判断し、早期に火災警報を発することが可能となる。 According to this configuration, the accumulation time can be set to prevent false alarms, and when the fire can be reliably determined at a high CO concentration or when there is a possibility of causing CO poisoning, the accumulation time is awaited. A fire alarm can be issued without any problems.
Therefore, in the present invention, even when it is difficult to determine whether a fire or a non-fire, it is possible to determine a fire by detecting a high CO concentration associated with incomplete combustion and to issue a fire alarm early.

本発明に係る複合型火災警報器の第二特徴構成は、前記制御部が、前記蓄積時間の計測中に、前記ＣＯ濃度が所定濃度以上となったとき前記蓄積時間と異なる第２蓄積時間を計測し、前記第２蓄積時間が経過する間に前記ＣＯ検知部が前記所定濃度以上のＣＯ濃度を継続して検知した場合、前記第２蓄積時間の経過後に火災警報を発する点にある。   A second characteristic configuration of the composite fire alarm according to the present invention is that the control unit has a second accumulation time different from the accumulation time when the CO concentration becomes a predetermined concentration or more during measurement of the accumulation time. When the CO detection unit continuously detects a CO concentration equal to or higher than the predetermined concentration while the second accumulation time has elapsed, a fire alarm is issued after the second accumulation time has elapsed.

本構成では、蓄積時間が経過する時より早期に火災警報を発する具体的な態様を特定できる。即ち、高ＣＯ濃度が第２蓄積時間の間継続する場合は調理や喫煙によるものではなく、火災によって発生したＣＯであるものと確実に判断することができる。
また、当該第２蓄積時間は、任意の時間を設定することができ、ゼロであってもよい。当該第２蓄積時間をゼロに設定した場合は、蓄積時間の計測中にＣＯ検知部が所定濃度以上のＣＯ濃度を検知すると、直ちに火災警報を発することとなり、より早期な火災警報の発報が実現する。 In this configuration, it is possible to specify a specific mode in which a fire alarm is issued earlier than when the accumulation time has elapsed. That is, when the high CO concentration continues for the second accumulation time, it can be reliably determined that the CO is not caused by cooking or smoking but is generated by a fire.
Moreover, the said 2nd accumulation | storage time can set arbitrary time, and may be zero. When the second accumulation time is set to zero, if the CO detection unit detects a CO concentration equal to or higher than the predetermined concentration during measurement of the accumulation time, a fire alarm is immediately issued, and an earlier fire alarm is issued. Realize.

本発明に係る複合型火災警報器の第三特徴構成は、前記制御部が、前記蓄積時間の計測中に、前記ＣＯ濃度が第１ＣＯ濃度以上かつ前記第１ＣＯ濃度より高い第２ＣＯ濃度未満となったとき前記蓄積時間と異なる第２蓄積時間を計測し、前記第２蓄積時間が経過する間に前記ＣＯ検知部が前記第１ＣＯ濃度以上かつ前記第２ＣＯ濃度未満のＣＯ濃度を継続して検知した場合、前記第２蓄積時間の経過後に火災警報を発し、前記ＣＯ濃度が前記第２ＣＯ濃度以上となったとき、火災警報を発する点にある。   According to a third characteristic configuration of the composite fire alarm device according to the present invention, the control unit is less than a second CO concentration that is higher than the first CO concentration and higher than the first CO concentration during the measurement of the accumulation time. A second accumulation time that is different from the accumulation time is measured, and the CO detector continuously detects a CO concentration that is greater than or equal to the first CO concentration and less than the second CO concentration while the second accumulation time elapses. In this case, a fire alarm is issued after elapse of the second accumulation time, and a fire alarm is issued when the CO concentration becomes equal to or higher than the second CO concentration.

本構成によれば、蓄積時間の計測中に、ＣＯ濃度が第１ＣＯ濃度以上かつ第２ＣＯ濃度未満であるときには、第２蓄積時間を設定して待機状態とすることができるため誤報を未然に防止できる。一方、ＣＯ濃度が急激に第２ＣＯ濃度以上に上昇すると、第２蓄積時間の経過を待つことなく早期に火災警報を発することができる。
従って、不完全燃焼に伴うＣＯ濃度が急激に上昇し、確実に火災と判断できる場合、又は、ＣＯ中毒を引き起こす可能性が高い場合等の緊急時には、より早期に火災警報を発することが可能となる。 According to this configuration, when the CO concentration is equal to or higher than the first CO concentration and lower than the second CO concentration during measurement of the accumulation time, the second accumulation time can be set to be in a standby state, thereby preventing false alarms. it can. On the other hand, if the CO concentration suddenly rises above the second CO concentration, a fire alarm can be issued early without waiting for the second accumulation time to elapse.
Therefore, it is possible to issue a fire alarm earlier in an emergency such as when the CO concentration associated with incomplete combustion suddenly increases and can be reliably determined as a fire, or when there is a high possibility of causing CO poisoning. Become.

以下、本発明の実施例を図面に基づいて説明する。
図１に示したように、本発明の複合型火災警報器Ｘは、煙を検知する煙検知部１０と、ＣＯを検知するＣＯ検知部２０と、煙検知部１０が検知した出力に基づく煙濃度が、火災警報の基準となる警報レベル以上となったときに蓄積時間を計測すると共に、蓄積時間が経過する間に煙検知部１０が警報レベル以上の煙濃度を継続して検知した場合、蓄積時間の経過後に警報手段４０により火災警報を発するように制御する制御部３０と、を備える。
制御部３０は、蓄積時間の計測中に、ＣＯ検知部２０が検知した出力に基づくＣＯ濃度が所定濃度以上に達すると、蓄積時間が経過する時より早期に火災警報を発する。 Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the composite fire alarm X of the present invention includes a smoke detection unit 10 that detects smoke, a CO detection unit 20 that detects CO, and smoke based on an output detected by the smoke detection unit 10. When the concentration is greater than or equal to the alarm level that is the standard for fire alarm, the accumulation time is measured, and when the smoke detector 10 continuously detects the smoke concentration above the alarm level while the accumulation time elapses, And a control unit 30 that controls the alarm means 40 to issue a fire alarm after the accumulation time has elapsed.
When the CO concentration based on the output detected by the CO detection unit 20 reaches a predetermined concentration or more during measurement of the accumulation time, the control unit 30 issues a fire alarm earlier than when the accumulation time has elapsed.

（煙検知部）
煙検知部１０は煙感知機能を有する例えば散乱光式煙センサを例示する。散乱光式煙センサは、発光部と受光部（図外）とからなり、発光部からの光が煙粒子にあたると生じる散乱現象を利用し、受光部の受光素子が散乱光を受けて生じる光電流の変化を検出する。 (Smoke detection unit)
The smoke detection unit 10 exemplifies a scattered light type smoke sensor having a smoke detection function. A scattered light type smoke sensor is composed of a light emitting part and a light receiving part (not shown), and utilizes a scattering phenomenon that occurs when light from the light emitting part hits smoke particles, and light generated by the light receiving element of the light receiving part receiving the scattered light. Detect changes in current.

（ＣＯ検知部）
ＣＯ検知部２０は熱線型半導体式センサを例示する。当該熱線型半導体式センサは、例えば、白金・パラジウム・白金−パラジウム合金等の貴金属線材に、酸化インジウム・酸化タングステン・酸化スズ等の金属酸化物を主成分とする金属酸化物半導体を塗布して覆い、乾燥後焼結成型してあるガス感応部を備える。 (CO detector)
The CO detection unit 20 exemplifies a hot wire semiconductor sensor. For example, the hot wire type semiconductor sensor is obtained by applying a metal oxide semiconductor mainly composed of a metal oxide such as indium oxide, tungsten oxide or tin oxide to a noble metal wire such as platinum, palladium or platinum-palladium alloy. A gas sensitive part that is covered and sintered after drying is provided.

（制御部）
制御部３０は、例えば以下の処理が実行できるマイコンにより構成される。
制御部３０は、煙検知部１０およびＣＯ検知部２０が検知した各出力に基づき、煙濃度およびＣＯ濃度をそれぞれ算出する濃度算出手段３１を備える。 (Control part)
The control part 30 is comprised by the microcomputer which can perform the following processes, for example.
The control unit 30 includes concentration calculation means 31 that calculates the smoke concentration and the CO concentration based on the outputs detected by the smoke detection unit 10 and the CO detection unit 20, respectively.

また、煙濃度において、火災警報の基準となる警報レベルを記憶する記憶手段３２を備える。さらに、煙濃度が警報レベル以上となったときに蓄積時間を計測する時間計測手段３３を備える。蓄積時間は、予め記憶手段３２に記憶しておく。
尚、警報レベルおよび蓄積時間については、複合型火災警報器Ｘの設置場所等に応じて異なる値を設定するようにしてもよい。そのため、設置場所の広さ・温度・湿度などに基づき警報レベル或いは蓄積時間を算出する演算手段３４を備えることが可能である。 Moreover, the storage means 32 which memorize | stores the alarm level used as the reference | standard of a fire alarm in smoke density is provided. Furthermore, a time measuring means 33 is provided for measuring the accumulation time when the smoke concentration becomes equal to or higher than the alarm level. The accumulation time is stored in the storage unit 32 in advance.
Note that different values may be set for the alarm level and the accumulation time depending on the installation location of the composite fire alarm X or the like. For this reason, it is possible to provide a calculation means 34 for calculating the alarm level or the accumulation time based on the size, temperature, humidity, etc. of the installation place.

蓄積時間は、火災警報器が火災警報の基準となる警報レベル以上の濃度の煙を検知したときであっても、予め設定した時間（蓄積時間）の間は火災警報の報知をしない待機状態とするために設定される。
通常、調理や喫煙等により発生した煙は一時的なものであり、蓄積時間が経過する間に煙濃度のレベルは低下する。そのため、一定濃度レベル以上の濃度の煙を検知した場合であっても、短時間で煙濃度が低下する場合は、蓄積時間を設定しておけば火災警報は報知され難くなり、誤報を未然に防止できる。 Accumulation time is a standby state in which the fire alarm is not notified during the preset time (accumulation time) even when the fire alarm detects smoke with a concentration higher than the alarm level that is the standard for fire alarm. Set to do.
Usually, smoke generated by cooking, smoking, etc. is temporary, and the level of smoke concentration decreases during the accumulation time. Therefore, even if smoke with a concentration higher than a certain concentration level is detected, if the smoke concentration drops in a short time, it is difficult to notify the fire alarm if the accumulation time is set, and false alarms will occur in advance. Can be prevented.

制御部３０は、蓄積時間が経過する間に煙検知部１０が警報レベル以上の煙濃度を継続して検知した場合、蓄積時間の経過後に、警報手段４０により火災警報を発するように制御する。
さらに、本発明では、蓄積時間の計測中に、ＣＯ検知部２０が検知した出力に基づくＣＯ濃度が所定濃度以上に達すると、蓄積時間が経過する時より早期に火災警報を発する。ここで、「所定濃度」は、本明細書では、例えば明らかに火災と判断できるＣＯ濃度、又は、ＣＯ中毒を引き起こす可能性のあるＣＯ濃度とする。 When the smoke detection unit 10 continuously detects a smoke concentration equal to or higher than the alarm level while the accumulation time elapses, the control unit 30 controls the alarm means 40 to issue a fire alarm after the accumulation time has elapsed.
Furthermore, in the present invention, when the CO concentration based on the output detected by the CO detection unit 20 reaches a predetermined concentration or more during measurement of the accumulation time, a fire alarm is issued earlier than when the accumulation time has elapsed. Here, the “predetermined concentration” is, for example, a CO concentration that can be clearly judged as a fire or a CO concentration that may cause CO poisoning.

本構成であれば、蓄積時間の計測中に検出したＣＯ濃度が所定濃度以上に達すると、蓄積時間が経過する時より早期に火災警報を発するため、蓄積時間を設定して誤報を未然に防止できる構成とすると共に、ＣＯ濃度が高いためにＣＯ中毒を引き起こす可能性がある場合には、蓄積時間の完了を待つことなく早期に火災警報を発することができる。   With this configuration, if the CO concentration detected during the accumulation time measurement exceeds the specified concentration, a fire alarm is issued earlier than when the accumulation time elapses, so the accumulation time is set to prevent false alarms. In addition to the configuration, if there is a possibility of causing CO poisoning due to high CO concentration, a fire alarm can be issued early without waiting for completion of the accumulation time.

制御部２０が、蓄積時間が経過する時より早期に火災警報を発する具体的な態様は、以下の通りである。
制御部３０は、蓄積時間の計測中に、ＣＯ濃度が所定濃度以上となったとき蓄積時間と異なる第２蓄積時間を時間計測手段３３により計測する。第２蓄積時間が経過する間にＣＯ検知部２０が所定濃度以上のＣＯ濃度を継続して検知した場合、第２蓄積時間の経過後に火災警報を発する。 A specific mode in which the control unit 20 issues a fire alarm earlier than when the accumulation time elapses is as follows.
During the measurement of the accumulation time, the control unit 30 measures the second accumulation time, which is different from the accumulation time, by the time measuring means 33 when the CO concentration becomes a predetermined concentration or more. When the CO detection unit 20 continuously detects a CO concentration equal to or higher than a predetermined concentration while the second accumulation time has elapsed, a fire alarm is issued after the second accumulation time has elapsed.

第２蓄積時間は、記憶手段３２に記憶しておくか、或いは、演算手段３４によりその都度設定してもよい。
本構成によると、高ＣＯ濃度が第２蓄積時間の間継続する場合は調理や喫煙によるものではなく、火災によって発生したＣＯであるものと確実に判断し、誤報の発生を確実に防ぐことができる。
当該第２蓄積時間は、任意の時間を設定することができ、ゼロであってもよい。当該第２蓄積時間をゼロに設定した場合は、蓄積時間の計測中にＣＯ検知部２０が所定濃度以上のＣＯ濃度を検知すると、直ちに火災警報を発することとなる。 The second accumulation time may be stored in the storage unit 32 or may be set by the calculation unit 34 each time.
According to this configuration, when the high CO concentration continues for the second accumulation time, it is determined not to be caused by cooking or smoking but to be CO generated by a fire, and the occurrence of false alarms can be reliably prevented. it can.
The second accumulation time can be set to an arbitrary time, and may be zero. When the second accumulation time is set to zero, when the CO detection unit 20 detects a CO concentration equal to or higher than a predetermined concentration during measurement of the accumulation time, a fire alarm is immediately issued.

（警報手段）
警報手段４０は、制御部３０によって火災と判断されたとき、制御部３０から警報信号を受け取り、警報音により聴覚的に、或いは、ランプの点滅等により視覚的に火災の発生を報知する。警報手段４０は、スピーカ・警報ランプ等で構成される。 (Alarm means)
When the control unit 30 determines that a fire has occurred, the alarm unit 40 receives an alarm signal from the control unit 30, and notifies the occurrence of the fire audibly by an alarm sound or visually by flashing a lamp or the like. The alarm means 40 is composed of a speaker, an alarm lamp and the like.

＜火災警報の報知＞
本発明の複合型火災警報器Ｘによる火災警報の報知タイミングを説明する。
図２において煙検知から火災警報の報知に至るまでのフローチャートを示し、図３において、ストーブの転倒などによって綿布団で火災が発生したときの煙濃度およびＣＯ濃度の推移と、複合型火災警報器Ｘによる火災警報の報知タイミングを示した。図３中の時刻ｔ１〜ｔ４において、複合型火災警報器Ｘの動作をそれぞれ以下に説明する。
本実施例では、時刻ｔ１を基点とし、時刻ｔ２〜ｔ４は、時刻ｔ１からの経過時間を示している。また、警報レベルを１０％/ｍ、所定濃度を５０ｐｐｍ、蓄積時間Ｔ１を４０秒と設定する。後述の実施例についても同様とする。 <Fire alarm notification>
The notification timing of the fire alarm by the composite fire alarm device X of the present invention will be described.
Fig. 2 shows a flowchart from smoke detection to fire alarm notification. Fig. 3 shows changes in smoke concentration and CO concentration when a fire occurs in a cotton duvet due to a fall of the stove, etc., and a combined fire alarm. The fire alarm notification timing by X is shown. At times t1 to t4 in FIG. 3, the operation of the combined fire alarm device X will be described below.
In the present embodiment, time t1 is a base point, and times t2 to t4 indicate elapsed time from time t1. Further, the alarm level is set to 10% / m, the predetermined concentration is set to 50 ppm, and the accumulation time T1 is set to 40 seconds. The same applies to the examples described later.

綿布団で火災が発生すると、通常、煙濃度は緩慢に上昇する。一方、不完全燃焼によって高濃度のＣＯが発生する虞があるため、できるだけ早期に火災警報を発することが望まれる。
従来の火災警報器では、蓄積時間Ｔ１が経過したとき（図２：＃２３０）に火災警報を発する。これに対して、本発明の複合型火災警報器Ｘでは、蓄積時間Ｔ１の計測中に検出したＣＯ濃度が所定濃度以上に達すると、蓄積時間Ｔ１が経過する時より早期に火災警報を発することができる。 When a fire occurs in a cotton duvet, the smoke concentration usually rises slowly. On the other hand, since there is a possibility that high-concentration CO may be generated due to incomplete combustion, it is desirable to issue a fire alarm as early as possible.
A conventional fire alarm issues a fire alarm when the accumulation time T1 has elapsed (FIG. 2: # 230). In contrast, in the combined fire alarm device X of the present invention, when the CO concentration detected during the measurement of the accumulation time T1 reaches a predetermined concentration or more, a fire alarm is issued earlier than when the accumulation time T1 elapses. Can do.

ｔ１（０秒）：煙濃度が警報レベルである１０％/ｍに達したため、蓄積時間（Ｔ１＝４０秒）の計測を開始する。（図２：＃１００〜＃１２０）
ｔ２（９秒）：ＣＯ濃度が所定濃度である５０ｐｐｍに達したため、第２蓄積時間（Ｔ２＝１０秒）の計測を開始する。（図２：＃１３０〜＃１７０）
ｔ３（１９秒）：第２蓄積時間Ｔ２の計測開始から１０秒が経過し、火災警報を発する。（図２：＃１８０〜＃２２０）
ｔ４（４０秒）：従来の複合型火災警報器では、この時点で火災警報を発することとなる。 t1 (0 seconds): Since the smoke concentration has reached the alarm level of 10% / m, measurement of the accumulation time (T1 = 40 seconds) is started. (Figure 2: # 100- # 120)
t2 (9 seconds): Since the CO concentration has reached a predetermined concentration of 50 ppm, measurement of the second accumulation time (T2 = 10 seconds) is started. (Fig. 2: # 130 to # 170)
t3 (19 seconds): 10 seconds have elapsed from the start of measurement of the second accumulation time T2, and a fire alarm is issued. (Figure 2: # 180- # 220)
t4 (40 seconds): In the conventional composite fire alarm, a fire alarm is issued at this point.

本発明の複合型火災警報器Ｘでは、本実施例では従来の複合型火災警報器と比べて２１秒も早期に火災警報を発することができた。従って、火災か非火災であるかの判断が難しい場合でも、誤った火災警報を発することは殆どなく、不完全燃焼に伴う高ＣＯ濃度を検出することで火災と判断して早期に火災警報を発することが可能である。   In the composite fire alarm device X of the present invention, in this example, a fire alarm could be issued as early as 21 seconds compared to the conventional composite fire alarm device. Therefore, even if it is difficult to determine whether a fire or non-fire, it is unlikely that a false fire alarm will be issued, and it will be judged early as a fire by detecting the high CO concentration associated with incomplete combustion. It is possible to emit.

尚、第２蓄積時間Ｔ２の計測終了時刻が、蓄積時間Ｔ１の計測終了時刻より遅くなる場合がある。このとき、第２蓄積時間Ｔ２の計測中であっても蓄積時間Ｔ１の計測終了時刻に火災警報を発する（図２：＃２４０）。   Note that the measurement end time of the second accumulation time T2 may be later than the measurement end time of the accumulation time T1. At this time, even if the second accumulation time T2 is being measured, a fire alarm is issued at the measurement end time of the accumulation time T1 (FIG. 2: # 240).

綿布団の火災のように火災初期に煙濃度が低い火災の他の例として、ゴミ箱火災について説明する。
図４に、木製のゴミ箱で火災が発生したときの煙濃度およびＣＯ濃度の推移と、本発明の複合型火災警報器Ｘによる火災警報の報知タイミングを示した。
木製のゴミ箱がある程度湿った状態で発生した火災は不完全燃焼を起こし易く、ＣＯ濃度が急激に上昇する虞があるため、上述した綿布団で火災と同様に早期に火災警報を発することが望まれる。 A trash can fire will be described as another example of a fire with a low smoke concentration at the beginning of the fire, such as a cotton duvet fire.
FIG. 4 shows changes in smoke concentration and CO concentration when a fire occurs in a wooden trash can, and the fire alarm notification timing by the combined fire alarm device X of the present invention.
Fires that occur when wooden trash cans are moistened to a certain extent are liable to cause incomplete combustion, and the CO concentration may increase rapidly. It is.

ｔ１（０秒）：煙濃度が警報レベルである１０％/ｍに達したため、蓄積時間（Ｔ１＝４０秒）の計測を開始する。
ｔ２（１５秒）：ＣＯ濃度が所定濃度である５０ｐｐｍに達したため、第２蓄積時間（Ｔ２＝１０秒）の計測を開始する。
ｔ３（２５秒）：第２蓄積時間Ｔ２の計測から１０秒が経過し、火災警報を発する。
ｔ４（４０秒）：従来の複合型火災警報器では、この時点で火災警報を発することとなる。
この場合も、本発明の複合型火災警報器Ｘでは、従来の複合型火災警報器と比べて１５秒も早期に火災警報を発することができた。 t1 (0 seconds): Since the smoke concentration has reached the alarm level of 10% / m, measurement of the accumulation time (T1 = 40 seconds) is started.
t2 (15 seconds): Since the CO concentration has reached a predetermined concentration of 50 ppm, measurement of the second accumulation time (T2 = 10 seconds) is started.
t3 (25 seconds): 10 seconds have elapsed from the measurement of the second accumulation time T2, and a fire alarm is issued.
t4 (40 seconds): In the conventional composite fire alarm, a fire alarm is issued at this point.
Also in this case, the composite fire alarm device X of the present invention was able to issue a fire alarm as early as 15 seconds compared to the conventional composite fire alarm device.

図５に、ポリプロピレン製のゴミ箱で火災が発生したときの煙濃度およびＣＯ濃度の推移と、本発明の複合型火災警報器Ｘによる火災警報のタイミングを示した。
樹脂製品であるポリプロピレン製のゴミ箱で発生した火災は、木製のゴミ箱での火災に比べて不完全燃焼を起こし易い。よって、木製のゴミ箱の場合と比べてできるだけ早期に火災警報を発する必要がある。そのためには、第２蓄積時間をゼロに設定すればよい。 FIG. 5 shows changes in smoke concentration and CO concentration when a fire occurs in a trash can made of polypropylene, and the timing of fire alarm by the combined fire alarm device X of the present invention.
A fire generated in a polypropylene trash can, which is a resin product, is more likely to cause incomplete combustion than a fire in a wooden trash can. Therefore, it is necessary to issue a fire alarm as early as possible compared to a wooden trash can. For this purpose, the second accumulation time may be set to zero.

ｔ１（０秒）：煙濃度が警報レベルである１０％/ｍに達したため、蓄積時間（Ｔ１＝４０秒）の計測を開始する。
ｔ２（９秒）：ＣＯ濃度が所定濃度である５０ｐｐｍに達したため、第２蓄積時間（Ｔ２＝０秒）の計測を開始する。本実施例では第２蓄積時間をゼロと設定した。
ｔ３（９秒）：第２蓄積時間Ｔ２の計測から０秒が経過し、火災警報を発する。
ｔ４（４０秒）：従来の複合型火災警報器では、この時点で火災警報を発することとなる。
これより、本発明の複合型火災警報器Ｘにおいて、本実施例では、ＣＯ濃度が所定濃度を超過した時点で火災警報を発することができるため、従来の複合型火災警報器と比べて３１秒も早期に火災警報を発することができた。 t1 (0 seconds): Since the smoke concentration has reached the alarm level of 10% / m, measurement of the accumulation time (T1 = 40 seconds) is started.
t2 (9 seconds): Since the CO concentration has reached a predetermined concentration of 50 ppm, measurement of the second accumulation time (T2 = 0 seconds) is started. In this embodiment, the second accumulation time is set to zero.
t3 (9 seconds): 0 seconds have elapsed from the measurement of the second accumulation time T2, and a fire alarm is issued.
t4 (40 seconds): In the conventional composite fire alarm, a fire alarm is issued at this point.
Thus, in the combined fire alarm device X of the present invention, in this embodiment, since a fire alarm can be issued when the CO concentration exceeds a predetermined concentration, 31 seconds compared with the conventional combined fire alarm device. Even fire alarms could be issued early.

〔別実施の形態〕
上述した実施形態では、蓄積時間の計測中に設定したＣＯ濃度の閾値（所定濃度）が１つである場合について説明した。しかし、これに限らず、ＣＯ濃度の閾値を２つ設定することが可能である。
つまり、ＣＯ濃度が所定濃度以上の範囲において、第１ＣＯ濃度および第２ＣＯ濃度の２つの閾値を設定する。第１ＣＯ濃度は、例えば上述した実施形態における所定濃度と同じ値とすることができ、第２ＣＯ濃度は第１ＣＯ濃度より高いものとする。 [Another embodiment]
In the above-described embodiment, the case has been described in which the threshold value (predetermined concentration) of the CO concentration set during the measurement of the accumulation time is one. However, the present invention is not limited to this, and two threshold values for CO concentration can be set.
That is, in the range where the CO concentration is equal to or higher than the predetermined concentration, two threshold values of the first CO concentration and the second CO concentration are set. For example, the first CO concentration can be set to the same value as the predetermined concentration in the above-described embodiment, and the second CO concentration is higher than the first CO concentration.

即ち、制御部３０は、時間計測手段３３によって蓄積時間を計測中に、ＣＯ濃度が第１ＣＯ濃度以上かつ第２ＣＯ濃度未満となったとき蓄積時間と異なる第２蓄積時間を時間計測手段３３によって計測し、第２蓄積時間が経過する間にＣＯ検知部２０が第１ＣＯ濃度以上かつ第２ＣＯ濃度未満のＣＯ濃度を継続して検知した場合、第２蓄積時間の経過後に火災警報を発し、ＣＯ濃度が第２ＣＯ濃度以上となったとき、火災警報を発する。   That is, the control unit 30 measures the second accumulation time, which is different from the accumulation time, when the CO concentration becomes equal to or higher than the first CO concentration and less than the second CO concentration while the time measurement unit 33 measures the accumulation time. If the CO detector 20 continuously detects a CO concentration that is greater than or equal to the first CO concentration and less than the second CO concentration while the second accumulation time has elapsed, a fire alarm is issued after the second accumulation time has elapsed, and the CO concentration A fire alarm is issued when the concentration exceeds the second CO concentration.

これにより、蓄積時間の計測中に、ＣＯ濃度が第１ＣＯ濃度以上かつ第２ＣＯ濃度未満であるときには、第２蓄積時間を設定して待機状態とすることができるため誤報を未然に防止できる。一方、ＣＯ濃度が急激に第２ＣＯ濃度以上に上昇すると、第２蓄積時間の経過を待つことなく早期に火災警報を発することができる。
従って、不完全燃焼に伴うＣＯ濃度が急激に上昇し、確実に火災と判断できる場合、又は、ＣＯ中毒の可能性が高い場合等の緊急時には、より早期に火災警報を発することが可能となる。 As a result, when the CO concentration is equal to or higher than the first CO concentration and lower than the second CO concentration during measurement of the accumulation time, the second accumulation time can be set to be in a standby state, thereby preventing false reports. On the other hand, if the CO concentration suddenly rises above the second CO concentration, a fire alarm can be issued early without waiting for the second accumulation time to elapse.
Therefore, it is possible to issue a fire alarm earlier in the event of an emergency such as when the CO concentration accompanying incomplete combustion increases rapidly and can be reliably determined as a fire, or when there is a high possibility of CO poisoning. .

本発明は、煙を検知する煙検知部と、ＣＯを検知するＣＯ検知部と、煙検知部が検知した出力に基づく煙濃度が、火災警報の基準となる警報レベル以上となったときに蓄積時間を計測すると共に、蓄積時間が経過する間に前記煙検知部が前記警報レベル以上の煙濃度を継続して検知した場合、前記蓄積時間の経過後に火災警報を発するように制御する制御部と、を備えた複合型火災警報器に利用できる。   The present invention accumulates when a smoke detection unit for detecting smoke, a CO detection unit for detecting CO, and a smoke concentration based on an output detected by the smoke detection unit are equal to or higher than an alarm level serving as a fire alarm reference. A control unit for measuring the time and controlling so that a fire alarm is issued after the accumulation time has elapsed when the smoke detection unit continuously detects a smoke concentration equal to or higher than the alarm level while the accumulation time has elapsed; , Can be used for a combined fire alarm.

本発明の複合型火災警報器の概略図Schematic of the composite fire alarm of the present invention 煙検知から火災警報に至るまでのフローチャートFlow chart from smoke detection to fire alarm 綿布団で火災が発生したときの煙濃度およびＣＯ濃度の推移と、複合型火災警報器による火災警報の報知タイミングを示した図Diagram showing the transition of smoke and CO concentrations when a fire broke out in a cotton duvet and the timing of fire alarm notifications using a combined fire alarm 木製のゴミ箱で火災が発生したときの煙濃度およびＣＯ濃度の推移と、本発明の複合型火災警報器による火災警報の報知タイミングを示した図A diagram showing the transition of smoke and CO concentrations when a fire occurs in a wooden trash can, and the fire alarm notification timing by the composite fire alarm of the present invention ポリプロピレン製のゴミ箱で火災が発生したときの煙濃度およびＣＯ濃度の推移と、本発明の複合型火災警報器による火災警報のタイミングを示した図Diagram showing the transition of smoke and CO concentrations when a fire occurs in a trash can made of polypropylene, and the timing of a fire alarm by the composite fire alarm of the present invention

符号の説明Explanation of symbols

Ｘ 複合型火災警報器
１０ 煙検知部
２０ ＣＯ検知部
３０ 制御部
Ｔ１ 蓄積時間
Ｔ２ 第２蓄積時間 X Combined fire alarm 10 Smoke detection unit 20 CO detection unit 30 Control unit T1 Accumulation time T2 Second accumulation time

Claims (3)

煙を検知する煙検知部と、ＣＯを検知するＣＯ検知部と、
前記煙検知部が検知した出力に基づく煙濃度が、火災警報の基準となる警報レベル以上となったときに蓄積時間を計測すると共に、前記蓄積時間が経過する間に前記煙検知部が前記警報レベル以上の煙濃度を継続して検知した場合、前記蓄積時間の経過後に火災警報を発するように制御する制御部と、を備えた複合型火災警報器において、
前記制御部は、
前記蓄積時間の計測中に、前記ＣＯ検知部が検知した出力に基づくＣＯ濃度が所定濃度以上に達すると、前記蓄積時間が経過する時より早期に火災警報を発する複合型火災警報器。 A smoke detector for detecting smoke, a CO detector for detecting CO,
When the smoke concentration based on the output detected by the smoke detection unit becomes equal to or higher than the alarm level serving as a fire alarm reference, the accumulation time is measured, and the smoke detection unit detects the alarm while the accumulation time elapses. In a combined fire alarm comprising a control unit that controls to emit a fire alarm after the accumulation time has elapsed, when smoke concentration above a level is detected continuously,
The controller is
A composite fire alarm that issues a fire alarm earlier than the time when the accumulation time elapses when the CO concentration based on the output detected by the CO detector reaches a predetermined concentration or more during measurement of the accumulation time. 前記制御部は、前記蓄積時間の計測中に、
前記ＣＯ濃度が所定濃度以上となったとき前記蓄積時間と異なる第２蓄積時間を計測し、前記第２蓄積時間が経過する間に前記ＣＯ検知部が前記所定濃度以上のＣＯ濃度を継続して検知した場合、前記第２蓄積時間の経過後に火災警報を発する請求項１に記載の複合型火災警報器。 The control unit, during the measurement of the accumulation time,
When the CO concentration becomes equal to or higher than a predetermined concentration, a second accumulation time different from the accumulation time is measured, and the CO detection unit continues the CO concentration equal to or higher than the predetermined concentration while the second accumulation time elapses. The combined fire alarm according to claim 1, wherein when detected, a fire alarm is issued after the second accumulation time has elapsed. 前記制御部は、前記蓄積時間の計測中に、
前記ＣＯ濃度が第１ＣＯ濃度以上かつ前記第１ＣＯ濃度より高い第２ＣＯ濃度未満となったとき前記蓄積時間と異なる第２蓄積時間を計測し、前記第２蓄積時間が経過する間に前記ＣＯ検知部が前記第１ＣＯ濃度以上かつ前記第２ＣＯ濃度未満のＣＯ濃度を継続して検知した場合、前記第２蓄積時間の経過後に火災警報を発し、
前記ＣＯ濃度が前記第２ＣＯ濃度以上となったとき、火災警報を発する請求項１に記載の複合型火災警報器。 The control unit, during the measurement of the accumulation time,
When the CO concentration is equal to or higher than the first CO concentration and lower than the second CO concentration that is higher than the first CO concentration, a second accumulation time that is different from the accumulation time is measured, and the CO detection unit is measured while the second accumulation time elapses. When continuously detecting a CO concentration not less than the first CO concentration and less than the second CO concentration, a fire alarm is issued after the second accumulation time has elapsed,
The combined fire alarm according to claim 1, wherein a fire alarm is issued when the CO concentration becomes equal to or higher than the second CO concentration.
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