JP2023179678A - fire detection system - Google Patents

Abstract

To provide a wirelessly interlocked fire detection system consisting of a plurality of fire detectors each capable of detecting a fire on an early stage and capable of preventing a non-fire alarm.SOLUTION: The present invention relates to a fire detector 1 which comprises a smoke detection section 2 for detecting a smoke concentration and a CO detection section 3 for detecting a CO concentration, and makes a fire determination based on calculation values of a detection value of the smoke detection section 2 and a detection value of the CO detection section 3. A first threshold is set to the detection value of the smoke detection section 2, and when the detection value of the smoke detection section 2 becomes equal to or greater than the first threshold, calculations of the detection value of the smoke detection section 2 and the detection value of the CO detection section 3 are started. When the calculation values become equal to or greater than a threshold of a fire level, the fire determination is made, and when the detection values of the smoke detection section 2 in a predetermined number of two or more fire detectors 2 become equal to or greater than the first threshold, a part of or all the fire detectors perform preliminary fire alarms.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wirelessly linked fire detection system comprising a plurality of fire detectors.

One of the typical types of fire detectors is one that detects smoke (smoke detector), but the applicant first developed a system that detects smoke and carbon monoxide (hereinafter referred to as "CO"). has proposed a method to do so (see Patent Document 1).

According to the above-mentioned fire detector that detects smoke and CO, fire detection is performed based on the calculated values of the two substances produced by combustion, smoke and CO, so fires can be detected early. (See Reference 1).

Japanese Patent Application Publication No. 2001-216579

By the way, smoke detectors have sensitivities stipulated by the Fire Service Act (there are types 1, 2, and 3 in descending order of sensitivity), but even the most sensitive type 1 smoke detector does not detect a fire. In addition to the smoke density that is determined to be a fire, the smoke density that is not determined to be a fire is also set. If a fire is determined at a smoke concentration lower than the smoke concentration that is determined to be a fire, there is a possibility that it is not a fire alarm.

In the case of the above-mentioned fire detector that detects smoke and CO, a fire can be determined early as described above. However, even if the smoke concentration is low, if the CO concentration is high, a fire determination may be made, so a fire determination may be made at a smoke concentration lower than the smoke concentration at which a fire is determined. In other words, there is a possibility that it is a non-fire alarm.

In view of the above circumstances, an object of the present invention is to obtain a wirelessly linked fire detection system consisting of a plurality of fire detectors, which can detect a fire at an early stage and prevent non-fire alarms. do.

A first invention includes a smoke detection section that detects smoke concentration and a CO detection section that detects CO concentration, and makes a fire determination based on a calculated value of a detection value of the smoke detection section and a detection value of the CO detection section. A first threshold is set for the detection value of the smoke detection section, and when the detection value of the smoke detection section exceeds the first threshold, the detection value of the smoke detection section and the detection value of the smoke detection section are set. The present invention is characterized in that calculation of the detected value of the CO detection unit is started, and a fire determination is made when the calculated value becomes equal to or higher than a fire level threshold.

Further, the second invention includes a smoke detection section that detects a smoke concentration and a CO detection section that detects a CO concentration, and detects a fire based on a calculated value of a detection value of the smoke detection section and a detection value of the CO detection section. The fire detector is characterized in that the detection value of the CO detection unit used to obtain the calculation value is set to a calculation effective maximum value.

In the above invention, a CO sensing threshold may be set for the detected value of the CO detecting unit, and a CO sensing determination may be performed when the detected value of the CO detecting unit exceeds the sensing threshold.

Further, in the above invention, a second threshold value is set for the detection value of the smoke detection unit, and when the detection value of the smoke detection unit becomes equal to or higher than the second threshold value, a fire determination is made. I can do it.

Further, a third invention is a wireless interlocking fire detection system comprising a plurality of fire detectors configured to perform processing in conjunction with each other by transmitting and receiving wireless signals, wherein the plurality of fire detectors Each sensor includes a smoke detection section that detects smoke concentration and a CO detection section that detects CO concentration, and detects a fire based on a calculated value of the detection value of the smoke detection section and the detection value of the CO detection section. In addition to being configured to make a determination, a first threshold value is set for the detection value of the smoke detection unit, and when the detection value of the smoke detection unit becomes equal to or greater than the first threshold value, the smoke detection unit The fire detection system is configured to start calculation of the detection value and the detection value of the CO detection unit, and the fire detection system is configured to calculate the detection value of the smoke detection unit in any of the fire detectors by transmitting and receiving a wireless signal. The other fire detectors are also configured to start calculating the detection value of the smoke detection section and the detection value of the CO detection section when the detection value exceeds the threshold value.

Further, a fourth invention is a wireless interlocking fire detection system comprising a plurality of fire detectors configured to perform processing in conjunction with each other by transmitting and receiving wireless signals, wherein the plurality of fire detectors Each sensor includes a smoke detection section that detects smoke concentration and a CO detection section that detects CO concentration, and detects a fire based on a calculated value of the detection value of the smoke detection section and the detection value of the CO detection section. The method is configured to make a determination, and a calculation effective maximum value is set for the detection value of the CO detection unit used for the calculation, and when the detection value of the CO detection unit exceeds the calculation effective maximum value, The fire detection system is configured to perform a calculation with the detection value of the smoke detection unit using the calculation effective maximum value, and the fire detection system detects the detection of the CO detection unit in any of the fire detectors by transmitting and receiving a wireless signal. The present invention is characterized in that, when the value exceeds the calculation effective maximum value, other fire detectors are also configured to perform the calculation using the calculation effective maximum value.

Further, a fifth invention is a wireless interlocking fire detection system comprising a plurality of fire detectors configured to perform processing in conjunction with each other by transmitting and receiving wireless signals, wherein the plurality of fire detectors Each sensor includes a smoke detection section that detects smoke concentration and a CO detection section that detects CO concentration, and detects a fire based on a calculated value of the detection value of the smoke detection section and the detection value of the CO detection section. In addition to being configured to make a determination, a first threshold value is set for the detection value of the smoke detection unit, and when the detection value of the smoke detection unit becomes equal to or greater than the first threshold value, the smoke detection unit The fire detection system is configured to start calculating the detected value and the detected value of the CO detection unit, and to make a fire determination when the calculated value exceeds a fire level threshold, and the fire detection system transmits and receives wireless signals. Accordingly, when the detection value of the smoke detection unit in two or more predetermined number of fire detectors becomes equal to or higher than the first threshold value, some or all of the fire detectors are configured to issue a preliminary warning of fire. (Claim 1)

Further, a sixth invention is a wireless interlocking fire detection system comprising a plurality of fire detectors configured to perform processing in conjunction with each other by transmitting and receiving wireless signals, wherein the plurality of fire detectors Each sensor includes a smoke detection section that detects smoke concentration and a CO detection section that detects CO concentration, and detects a fire based on a calculated value of the detection value of the smoke detection section and the detection value of the CO detection section. In addition to being configured to make a determination, a first threshold value is set for the detection value of the smoke detection unit, and when the detection value of the smoke detection unit becomes equal to or greater than the first threshold value, the smoke detection unit The fire detection system is configured to start calculating the detected value and the detected value of the CO detection unit, and to make a fire determination when the calculated value exceeds a fire level threshold, and the fire detection system transmits and receives wireless signals. Accordingly, when the detection value of the smoke detection unit in any of the fire detectors becomes equal to or higher than the first threshold value, the other fire detectors are configured to change the communication mode of the wireless signal to a reception priority mode. (Claim 2).

Further, a seventh invention is a wireless interlocking fire detection system comprising a plurality of fire detectors configured to perform processing in conjunction with each other by transmitting and receiving wireless signals, wherein the plurality of fire detectors are Each sensor includes a smoke detection section that detects smoke concentration and a CO detection section that detects CO concentration, and detects a fire based on a calculated value of the detection value of the smoke detection section and the detection value of the CO detection section. In addition to being configured to make a determination, a first threshold value is set for the detection value of the smoke detection unit, and when the detection value of the smoke detection unit becomes equal to or greater than the first threshold value, the smoke detection unit The fire detection system is configured to start calculating the detected value and the detected value of the CO detection unit, and to make a fire determination when the calculated value exceeds a fire level threshold, and the fire detection system transmits and receives wireless signals. Accordingly, when the detection value of the smoke detection section in any of the fire detectors becomes equal to or higher than the first threshold value, the sampling period of the smoke concentration of the smoke detection section and/or the CO concentration of the CO detection section of the other fire detector increases. (Claim 3).

In the above invention, the fire detection system is configured such that when one of the fire detectors makes a fire determination and issues a fire detection alarm by transmitting and receiving a wireless signal, the other fire detectors also issue a fire detection alarm. It can be configured as follows. Further, in the above invention, each of the plurality of fire detectors further has a second threshold set to the detection value of the smoke detection section, and the detection value of the smoke detection section is equal to or higher than the second threshold. The device may be configured to make a fire determination when the fire occurs.

In the first invention, when the detected value of the smoke concentration detected by the smoke detector is less than the first threshold value, the calculation of the detected value of the smoke detector and the detected value of the CO detector is not started, and the fire determination is made. It will never be done. That is, a fire determination is not made using a detected value of low smoke concentration that is less than the first threshold value. As a result, it is possible to prevent a fire from being determined as a result of a high CO concentration detected by the CO detection unit even though the smoke concentration detected by the smoke detection unit is low. information can be prevented.

Further, in the second invention, when the detected value of the CO concentration detected by the CO detection unit exceeds the calculation effective maximum value, the actual detected value including the excess exceeding the calculation effective maximum value is not used, and the calculation is performed. The effective maximum value is used to perform calculations with the detection value of the smoke detector, and a fire determination is made based on the calculation. That is, the actual detected value of high CO concentration, including the excess amount exceeding the effective maximum calculated value, is not used to determine a fire. As a result, it is possible to prevent a fire from being determined because the CO concentration detected by the CO detector is high even though the smoke concentration detected by the smoke detector is low. can be prevented.

Therefore, according to both the first and second inventions, it is possible to obtain a fire detector that can detect a fire at an early stage and can prevent non-fire alarms.

Furthermore, in the third and fifth to seventh inventions, the same thing as the first invention can be done in each of the fire detectors. Moreover, in the fourth invention, the same thing as the second invention can be done in each of the fire detectors.

Therefore, according to any of the third to seventh inventions, it is possible to obtain a wirelessly linked fire detection system consisting of a plurality of fire detectors, which can detect a fire at an early stage and can prevent non-fire alarms. I can do it.

1 is a block diagram showing an overview of the equipment configuration of a fire detector, showing an example of an embodiment of the present invention. FIG. It is a flowchart which showed the operation|movement flow of an example (1st process aspect) of the sensing process of a fire detector same as the above. It is a flowchart which showed the operation|movement flow of other examples (2nd process aspect) same as the above. It is a flowchart which showed the operation|movement flow of other examples (3rd process aspect) same as the above. It is a flowchart which showed the operation|movement flow of other examples (4th process aspect) same as the above.

An embodiment of the present invention will be described with reference to the drawings, taking as an example a case in which it is applied to a residential fire alarm (hereinafter also simply referred to as a "fire alarm"). Note that the present invention is applicable not only to residential fire alarms but also to fire detectors in automatic fire alarm equipment.

<Basic configuration>
First, the basic configuration of a fire alarm 1, which is an example of an embodiment of the present invention, will be described with reference to the block diagram of FIG. 1.

As shown in FIG. 1, the fire alarm 1 includes a smoke detection section 2 that detects smoke concentration, a CO detection section 3 that detects CO concentration, and a control unit that performs various controls inside its casing (not shown). unit 4 (which includes a detection processing unit 5 and an alarm processing unit 6. The functions of each will be explained later), a storage unit 7 where various threshold values are set and stored, and a display output unit 8 (including a fire alarm lamp 9 and a CO alarm). (to which a lamp 10 is connected), an audio output section 11 (to which a speaker 12 is connected), a battery 13, and the like.

When the fire alarm 1, which is a residential fire alarm, detects a fire, it issues an alarm. Further, as will be explained later, when a high concentration of CO at a warning level is detected, a CO detection alarm can be issued. Note that, as described above, the present invention can also be applied to a fire detector for automatic fire alarm equipment. In the case of the fire detector in the same equipment, when a fire is detected, a fire signal is output to the receiver to notify the fire.

-Smoke detection unit The smoke detection unit 2 detects smoke concentration. The smoke detection section 2 includes, for example, a light-emitting element, a light-receiving element, a smoke detection section, an optical trap, a labyrinth, etc., and the light-receiving element detects the scattered light of the light-emitting element generated when smoke flows into the smoke detection section. A photoelectric type is preferably used, which receives light and detects the density of smoke based on the amount of light received.

-CO detection unit The CO detection unit 3 detects CO concentration. As the CO detection unit 3, various types of CO sensors capable of detecting CO concentration can be used. For example, the following method can be used.
...Semiconductor type A semiconductor type CO sensor detects CO concentration by adsorption of CO on the semiconductor surface and change in resistance value due to redox reaction.
...Electrochemical type An electrochemical type CO sensor consists of a sensing electrode using a noble metal catalyst, a counter electrode, and an ion conductor. When CO reacts with water vapor in the air on the catalyst, a battery is formed between the sensing electrode and the counter electrode. , the CO concentration is detected based on the potential difference.

-Control Unit The control unit 4 that performs various controls includes the detection processing unit 5 and the alarm processing unit 6, as described above.
...Detection Processing Unit The detection processing unit 5 performs various processes such as calculations and comparisons with various threshold values for the smoke concentration detection value detected by the smoke detection unit 2 and the CO concentration detection value detected by the CO detection unit ( (The details of the specific process will be explained later).
... Alarm Processing Unit When the detection processing unit 5 determines that there is a fire, the alarm processing unit 6 performs alarm processing ( A fire detection alarm is issued by lighting or flashing the fire alarm lamp 9 or by generating a sound or a buzzer sound from the speaker 12. In addition, when issuing a CO detection alarm, when the detection processing unit 5 determines that CO has been detected, the CO alarm lamp 10 and speaker 12 are used to issue a CO detection alarm via the display output unit 8 and audio output unit 11. Processing (issues a CO detection alarm by lighting or blinking the fire alarm lamp 10 or generating a sound or a buzzer sound from the speaker 12).

・Storage unit The storage unit 7 stores various threshold values used in various processes of the detection processing unit 5 (smoke/CO composite concentration threshold for fire detection (fire level threshold), smoke for starting calculations, etc., which will be explained later). A first concentration threshold, a calculation effective maximum value of CO concentration, a second smoke concentration threshold for smoke alone detection, a CO concentration sensing threshold for CO alone detection, etc.) are set and stored.

<Method for detecting fire, etc.>
Next, with reference to the operation flowcharts of FIGS. 2 to 5, we will explain the first to fifth processing modes (CO detection (There are aspects including processing methods).

≪First processing mode (combined fire detection processing + calculation start threshold setting)≫
・Combined fire detection processing method for smoke concentration and CO concentration (fire detection processing based on the calculated value of the detected value of smoke concentration and the detected value of CO concentration)
In the first processing mode, the detected value of the smoke concentration detected by the smoke detector 2 and the detected value of the CO concentration detected by the CO detector 3 are calculated (for example, multiplied), and the calculated value (hereinafter referred to as " The sensor level) is compared with a smoke/CO combined concentration threshold for fire detection (hereinafter also referred to as the "fire level threshold"), and when the concentration exceeds the threshold, it is determined that there is a fire.

The fire alarm 1 can detect a fire early by executing this composite fire detection processing method. Note that the combined fire detection processing method is executed not only in the first processing mode but also in any of the second to fourth modes described below.

- Setting of calculation start threshold (first threshold of smoke concentration) In the first processing mode, the first threshold of smoke concentration is set as the threshold for starting the calculation of the detected value of smoke concentration and the detected value of CO concentration. A threshold of 1 is set. The first threshold value and the detected value of smoke concentration are compared, and when the detected value of smoke concentration and the detected value of CO concentration are compared, the calculation of the detected value of smoke concentration and the detected value of CO concentration is started. That is, when the detected value of smoke concentration is less than the first threshold value, the calculation of the detected value of smoke concentration and the detected value of CO concentration is not started.

By setting the first smoke concentration threshold, the fire alarm 1 does not use a low smoke concentration detection value that is less than the first threshold to make a fire determination. As a result, it is possible to prevent a fire determination from being made due to a high detected value of CO concentration even though the detected value of smoke concentration is too low for a fire determination, and it is possible to prevent non-fire alarms. .

That is, by executing the sensing processing method of the first processing mode, the fire alarm 1 can detect a fire at an early stage and can prevent non-fire alarms.

Note that the first threshold value of the smoke concentration is set, for example, as a value lower than the smoke concentration that is the sensitivity of the sensitivity type according to the Fire Service Act to which the fire alarm 1 belongs.

・Operation flow of the first processing mode FIG. 2 shows an example of the operation flow of the fire alarm 1 up to the fire detection alarm when the detection processing method of the first processing mode is adopted. It is a flow diagram.

As shown in the figure, in the case of the first processing mode, from the execution of the start step (S1) of the processing, first, the detection processing section 5 performs detection to sample the smoke concentration value detected by the smoke detection section 2. Step (S2) and a detection step (S3) of sampling the detected value of the CO concentration detected by the CO detection unit 3 are executed. Next, the detection processing unit 5 executes a judgment processing step (S4) to determine whether or not the detected value of the smoke concentration is equal to or greater than a first threshold value which is a calculation start threshold value, and when it becomes equal to or greater than the first threshold value, the smoke concentration is determined. A calculation processing step (S5) of the detected value of and the detected value of CO concentration is executed. Then, the detection processing unit 5 performs a judgment processing step (S6) to determine whether the sensor level (calculated value of the detected value of smoke concentration and the detected value of CO concentration) is equal to or higher than the fire level threshold (smoke/CO combined concentration threshold). The process is further executed, and when the sensor level becomes equal to or higher than the fire level threshold, it is determined that there is a fire, and the alarm processing section 6 executes the fire detection alarm processing step (S7).

≪Second processing mode (combined fire detection processing + setting of calculation effective maximum value)≫
・Setting the effective maximum value for calculation of CO concentration (upper limit value used for calculation) In the second processing mode, instead of the first threshold for smoke concentration (calculation start threshold) in the first processing mode, the above-mentioned A calculation effective maximum value is set on the CO concentration detection value side used for calculation of the smoke concentration detection value and the CO concentration detection value.

When the detected value of CO concentration exceeds this calculated effective maximum value, the actual detected value including the excess value exceeding the calculated effective maximum value is not used, but the calculated effective maximum value is used and the detected value of the smoke detector is A fire determination is made based on the calculation. That is, the actual detected value of high CO concentration, including the excess amount exceeding the effective maximum calculated value, is not used to determine a fire.

In the fire alarm 1, the CO concentration detected by the CO detection unit is high even though the detected value of the smoke concentration detected by the smoke detection unit is low because the calculated maximum effective value of CO concentration is set. Therefore, it is possible to prevent a fire judgment from being made due to a fire alarm, and a non-fire alarm can be prevented.

That is, the fire alarm 1 can detect a fire at an early stage and can prevent non-fire alarms also by executing the sensing processing method of the second processing mode.

・Operation flow of the second processing mode FIG. 3 shows an example of the process flow up to the fire detection alarm when the detection processing method of the second processing mode is adopted in the fire alarm device 1. It is a flow diagram.

As shown in the figure, in the second processing mode, the first After the process is executed in the same way as in the processing mode, the step (S4) of calculating the detected value of smoke concentration and the detected value of CO concentration by the detection processing unit 5 is executed, but at this time, the detected value of CO concentration is When the effective maximum value is exceeded, the actual detected value including the excess amount exceeding the calculated effective maximum value is not used, but the calculated effective maximum value is used to calculate the detected value of the smoke detection section. After that, similarly to the first processing mode, a comparison of the sensor level and the fire level threshold and a judgment processing step (S5) are executed, and if it is determined that there is a fire, a fire detection alarm processing step (S6) is executed. be done.

≪Third processing mode (combined fire detection processing + calculation start threshold setting + single smoke detection processing)≫
-Smoke-only sensing processing method In the third processing mode, in addition to the first processing mode, a smoke concentration-only sensing processing method is executed. That is, in the third aspect, a second threshold of smoke concentration is further set as a threshold for smoke alone detection. The second threshold value of the smoke concentration is set as a value higher than the first threshold value, and when the detected value of the smoke concentration exceeds the second threshold value, the fire determination based on the sensor level is not waited. It was determined that there was a fire.

The fire alarm 1 further sets a second threshold value for smoke concentration, so that even if a fire determination is not made based on the sensor level, if the detected value for smoke concentration exceeds the second threshold value, the fire alarm 1 detects a fire. A fire can be determined based on the In other words, misreporting can be prevented. Furthermore, since fire determination is also performed based on the second threshold value of smoke concentration, there is an advantage that it is possible to respond to fires in which the amount of CO generated is small. For example, when combustible materials burn all at once, such as when foamed polyurethane or chemical fibers burn, the amount of CO generated decreases. It is also possible to deal with fires where the amount of CO generated is small.

In other words, by executing the sensing processing method of the third processing mode, the fire alarm 1 can detect a fire at an early stage, can prevent non-fire alarms, and can also prevent false alarms. It can also be prevented. In addition, it can respond to a variety of fires that involve different types of combustible materials and how they burn.

Note that the second threshold value of the smoke concentration in the third processing mode can specifically be the value of the smoke concentration that is the sensitivity of the sensitivity type according to the Fire Service Act to which the fire alarm 1 belongs. In this way, even if a fire cannot be detected early by fire determination based on the sensor level, the fire can be detected at least with the sensitivity of the sensitivity type specified in the Fire Service Act.

・Operation flow of the third processing mode FIG. 4 shows an example of the process flow up to the fire detection alarm when the detection processing method of the third processing mode is adopted in the fire alarm device 1. It is a flow diagram.

As shown in the figure, in the case of the third processing mode, in addition to the processing of the first processing mode, there is a step of determining whether the detected value of the smoke concentration by the detection processing unit 5 is equal to or higher than the second threshold value. (S4) is added. That is, after the steps from the start step (S1) of the process to the step of sampling the detected value of smoke concentration (S2) and the step of sampling the detected value of CO concentration (S3) are executed in the same manner as in the first processing mode, the detection processing section 5, regarding the detected value of smoke concentration, a step (S4) of determining whether the detected value of smoke concentration is equal to or higher than the second threshold for smoke detection alone, and a step (S5) of determining whether the detected value is equal to or higher than the first threshold for starting calculation. ) is executed. Then, when the detected value of the smoke concentration exceeds the first threshold value, as in the first processing mode, a calculation processing step (S6) of the detected value of the smoke concentration and the detected value of the CO concentration, and the sensor level and the fire alarm are performed. Level threshold comparison and determination processing steps (S7) are sequentially executed, and if it is determined that there is a fire, a fire detection alarm processing step (S8) is executed. On the other hand, when the detected value of the smoke concentration exceeds the second threshold value, a fire is determined without waiting for the fire determination based on the sensor level, and the fire detection alarm processing step (S8) is immediately executed.

≪Fourth processing mode (combined fire detection processing + setting of calculation effective maximum value + CO single detection processing)≫
- CO only sensing and processing method In the fourth aspect, in addition to the sensing and processing method of the second aspect, a CO only sensing and processing method is executed. That is, in the fourth aspect, a CO concentration sensing threshold for sensing CO alone is further set. The sensing threshold is set as a high concentration value exceeding the calculation effective maximum value, and when the detected value of CO concentration exceeds the sensing threshold, it is determined that CO has been sensed.

By executing this CO single sensing processing method, the fire alarm 1 can detect CO at a concentration exceeding the maximum value even if the calculation effective maximum value is set as in the second processing mode. It is possible.

In other words, by executing the sensing processing method of the fourth processing mode, the fire alarm 1 can detect a fire at an early stage, can prevent non-fire alarms, and can also emit CO2. It can also be sensed.

・Operation flow of the fourth processing mode Figure 5 shows the flow of processing up to the fire detection alarm and CO detection alarm when the detection processing method of the fourth processing mode is adopted in the fire alarm 1. It is an operation flow diagram showing an example.

As shown in the figure, in the case of the fourth processing mode, the flow of fire detection processing from the processing start step (S1) to the fire detection alarm processing step (S6) is the same as in the second processing mode. However, after the step of sampling the detected smoke concentration (S2) and the step of sampling the detected value of CO concentration (S3), the CO sensing process is executed in parallel with the fire sensing process. That is, after the sampling step (S2) of the detected value of smoke concentration and the step (S3) of sampling the detected value of CO concentration are executed, the detection processing unit 5 performs a separate process flow in which the detected value of CO concentration is converted to CO alone. The step (S7) of determining whether or not the CO concentration for sensing is equal to or higher than the sensing threshold is executed, and when the detected value of CO concentration is equal to or higher than the sensing threshold, it is determined that CO has been detected, and the alarm processing unit 6 A CO sensing alarm processing step (S8) is executed.

<Specific examples of various threshold values, etc.>
The fire alarm 1 is a residential fire alarm, and if it falls under type 2 sensitivity according to the Fire Service Act, the required sensitivity is 10%/m as a smoke density. The various threshold values mentioned above are determined based on the smoke density of this required sensitivity, and can be set as follows, for example.

・Fire level threshold (smoke/CO composite concentration threshold)
The fire level threshold may be, for example, 500 ppm·%/m. Thereby, a fire can be detected earlier than in the case where the smoke density of 10%/m, which is the required sensitivity of two sensitivity types, is detected alone.
- The first threshold value of smoke density for starting the calculation can be, for example, 5%/m. Thereby, even though there are two types of sensitivity, it is possible to prevent the sensitivity type whose required sensitivity is 5% smoke density/m from becoming more sensitive than the one type.
- The calculation effective maximum value of CO concentration can be, for example, 100 ppm.
- The second threshold of smoke concentration for smoke alone detection can be, for example, 10%/m. Thereby, even if the combined fire detection based on the sensor level is not performed as prescribed, fire detection can be performed with the required sensitivity of at least two sensitivity types.
- The sensing threshold of CO concentration for sensing CO alone can be, for example, 200 ppm. It is said that symptoms such as headaches begin to appear in the human body when the concentration of CO is around 200 ppm.

<Example of configuration change>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified within the scope of the gist of the invention.

≪Changing the combination of processing≫
For example, in the sensing processing methods of the first to fourth processing modes described above, the combination of processing can be changed within a range that does not cause inconsistency.

Specifically, a CO-only sensing processing method in the fourth processing mode may be added to the sensing processing method in the first or third processing mode. By doing so, in addition to the above-mentioned effects obtained when employing the sensing processing method of the first or third processing mode, it becomes possible to further sense CO.

≪Application to wireless-linked fire alarms≫
Further, the above-mentioned fire alarm 1 is further equipped with a wireless signal transmitting/receiving means, and a wirelessly linked fire detection system consisting of a plurality of fire alarms, in which processing is executed in conjunction with each other by transmitting and receiving wireless signals, is provided. It may be configured. As a mode of interlocking processing by transmitting and receiving wireless signals, for example, the following interlocking processing can be performed. Note that the aspect of the interlocking processing described here is also applicable when the present invention is applied to a fire detector in an automatic fire alarm system.

・As an interlocking process using the first threshold value (calculation start threshold value) of the smoke concentration (each fire alarm device 1 uses one in which the first threshold value of the smoke concentration described above is set), the following interlocking process ( (first to fourth interlocking processing modes)).

...First interlocking processing mode (calculation start processing in the interlocking fire alarm)
When the detected value of smoke concentration in any fire alarm 1 becomes equal to or higher than the first threshold value, not only that fire alarm 1 but also other fire alarms 1 detect the detected value of smoke concentration and the CO concentration. Assume that the calculation of the detected value of is started.
Through this interlocking process, calculation of the smoke concentration detection value and the CO concentration detection value is started not only in the interlocking source fire alarm device 1 but also in all the fire alarm devices 1 including the interlocking destination fire alarm device 1. This allows faster fire determination processing.
Note that the arithmetic processing in the interlocking fire alarm device 1 may be performed using the smoke concentration detection value and the CO concentration detection value detected by each of them. However, for the value on the smoke density side, the detected value of the fire alarm 1 that is the interlocking source can be used, or the first threshold value can be used as the lowest value. When using the first threshold as the lowest value, for example, when the first threshold is exceeded, the calculation is started using the detected value, and when the first threshold is not exceeded, the first threshold is The detected value can be used to start calculation using the detected value and then used when the detected value exceeds the first threshold value.

...Second linked processing mode (preliminary alarm processing)
When the smoke concentration detected by two or more predetermined numbers of fire alarms 1 exceeds the first threshold, all the fire alarms 1 issue a preliminary alarm (an alarm different from a fire detection alarm). , a preliminary warning before the fire detector alarm).
Through this linked processing, when there is a high possibility that a fire detection warning will be issued later, a preliminary warning can be issued at that stage, prompting preliminary responses such as evacuation preparations. can.
Specifically, in this aspect, for example, when the number of fire alarm devices 1 whose detected value of smoke concentration is equal to or higher than the first threshold value has not reached a predetermined number, information on that number is used for all fire alarms. It can be held and shared in the container 1. Thereafter, when a predetermined number is reached, all the fire alarm devices 1 may issue a preliminary alarm.
Here, if the fire progresses normally, the fire alarm 1 will determine the fire if the detected value of the smoke concentration is equal to or higher than the first threshold before the preliminary alarm conditions are met, but the fire progresses slowly. In some cases, it takes time to determine the fire. Even in such cases, fires can be detected early by issuing preliminary warnings.
Preliminary warnings may include lighting or flashing lamps, buzzers from speakers, or voice messages that convey that there is a high possibility that a fire detection alarm will be issued later. It can be based on the following.
In addition, in the case of a wirelessly linked system using residential fire alarms 1, it is preferable that all fire alarms 1 issue preliminary alarms as described above, but depending on the conditions of the installation location, some Only the fire alarm 1 may issue a preliminary alarm.
Furthermore, when applying to a wireless interlocking system using fire detectors in automatic fire alarm equipment, all fire detectors may issue preliminary alarms, but since they will be installed in large buildings such as buildings, Only some fire detectors in a specific area, such as fire detectors in the same area as the fire detector whose smoke concentration detection value is equal to or higher than the first threshold, or adjacent fire detectors, are in reserve. It may also be used to issue a warning.

...Third interlocking processing mode (processing to change the communication mode in the interlocking fire alarm)
When the detected value of smoke concentration in any of the fire alarms 1 becomes equal to or higher than the first threshold value, the other fire detectors 1 change the communication mode of the wireless signal transmitting/receiving means to a reception priority mode. (For example, reduce the frequency of transmission to make it easier to receive).
With this interlocking process, the fire alarm 1 that is the link destination can receive the wireless signal from the fire alarm 1 that is the link source more quickly, and the interlock process can be performed more quickly.

...Fourth interlocking processing mode (processing to change the sampling cycle in the interlocking fire alarm)
When the detected value of the smoke concentration in any fire alarm 1 becomes equal to or higher than the first threshold value, the other fire alarm 1 detects the smoke concentration of the smoke detector 2 and/or the CO concentration of the CO detector 3. The sampling period shall be accelerated.
This interlocking process allows the smoke detector 2 and/or CO detector 3 to perform the detection process more quickly in the fire alarm 1 that is the interlock destination, and allows the subsequent arithmetic processing and fire determination process to be performed more quickly. I can do it.

・The following interlocking process (the fifth interlocking process aspect).

...Fifth interlocking processing mode (use of the maximum calculation effective value in the interlocking fire alarm)
When the detected value of CO concentration in any of the fire alarms 1 exceeds the calculated effective maximum value, not only the fire alarm 1 that exceeded the calculated effective maximum value but also the other fire alarms 1 The value shall be used to calculate the detected value of smoke concentration.
Through this interlocking process, not only the fire alarm 1 that is the link source, but also all fire alarms 1 including other fire alarms 1 that are the link destination, use the calculated maximum value to compare the detected value of smoke concentration. It is possible to perform calculations, and fires can be detected at an early stage.

- Combination of interlocking processes The first to fifth interlocking processing modes described above can be executed in combination to the extent that no contradiction occurs. In addition, both aspects are executed in combination with interlocking processing in which when one of the fire alarm devices 1 makes a fire determination and issues a fire detection alarm, the other fire alarm devices 1 also issue a fire detection alarm. It can be assumed that

1: Fire alarm 2: Smoke detection section 3: CO detection section 4: Control section 5: Detection processing section 6: Alarm processing section 7: Storage section 8: Display output section 9: Door alarm lamp 10: Gas alarm lamp 11 :Audio output part 12:Speaker

Claims (3)

A wireless interlocking fire detection system consisting of a plurality of fire detectors configured to perform processing in conjunction with each other by transmitting and receiving wireless signals,
Each of the plurality of fire detectors includes a smoke detection section that detects smoke concentration and a CO detection section that detects CO concentration, and a calculated value of a detection value of the smoke detection section and a detection value of the CO detection section. A first threshold value is set for the detection value of the smoke detection section, and when the detection value of the smoke detection section becomes equal to or greater than the first threshold value, the It is configured to start calculating the detection value of the smoke detection unit and the detection value of the CO detection unit, and to make a fire determination when the calculated value becomes equal to or higher than a fire level threshold,
The fire detection system is configured to activate some or all of the fire detectors when a detection value of the smoke detector in two or more predetermined number of fire detectors becomes equal to or higher than the first threshold value by transmitting and receiving a wireless signal. A wirelessly linked fire detection system configured to provide preliminary fire alarm. A wireless interlocking fire detection system consisting of a plurality of fire detectors configured to perform processing in conjunction with each other by transmitting and receiving wireless signals,
Each of the plurality of fire detectors includes a smoke detection section that detects smoke concentration and a CO detection section that detects CO concentration, and a calculated value of a detection value of the smoke detection section and a detection value of the CO detection section. A first threshold value is set for the detection value of the smoke detection section, and when the detection value of the smoke detection section becomes equal to or greater than the first threshold value, the It is configured to start calculating the detection value of the smoke detection unit and the detection value of the CO detection unit, and to make a fire determination when the calculated value becomes equal to or higher than a fire level threshold,
The fire detection system is configured to give priority to reception of the communication mode of the wireless signal to other fire detectors when a detection value of the smoke detection unit in any of the fire detectors becomes equal to or higher than the first threshold value due to transmission/reception of the wireless signal. What is claimed is: 1. A wirelessly linked fire detection system, characterized in that the system is configured to change into a mode. A wireless interlocking fire detection system consisting of a plurality of fire detectors configured to perform processing in conjunction with each other by transmitting and receiving wireless signals,
Each of the plurality of fire detectors includes a smoke detection section that detects smoke concentration and a CO detection section that detects CO concentration, and a calculated value of a detection value of the smoke detection section and a detection value of the CO detection section. A first threshold value is set for the detection value of the smoke detection section, and when the detection value of the smoke detection section becomes equal to or greater than the first threshold value, the It is configured to start calculating the detection value of the smoke detection unit and the detection value of the CO detection unit, and to make a fire determination when the calculated value becomes equal to or higher than a fire level threshold,
In the fire detection system, when the detection value of the smoke detection section in any of the fire detectors becomes equal to or higher than the first threshold value by transmitting/receiving a wireless signal, the other fire detectors detect the smoke concentration and/or the smoke detection section of the smoke detection section. Or a wirelessly linked fire detection system, characterized in that it is configured to hasten the sampling period of the CO concentration of the CO detection unit.

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