JP2021082191A - Fire sensor and fire sensing system - Google Patents

Abstract

To provide a wireless interlocking type fire sensing system consisting of a fire sensor capable of detecting a fire at an early stage and preventing a non-fire alarm, and a plurality of fire detectors capable of doing so.SOLUTION: A fire sensor 1 includes a smoke detection unit 2 that detects smock concentration, and a CO detection unit 3 that detects the CO concentration, and performs a fire determination based on a calculated value of the detection values of the smoke detection unit 2 and the detected value of the CO detection unit 3. A first threshold value is set for the detection value of the smoke detection unit 2, and the calculation of the detection value of the smoke detection unit 2 and the detection value of the CO detection unit 3 are started when the detection value of the smoke detection unit 2 becomes equal to or higher than the first threshold value.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fire detector and a wireless interlocking fire detection system including a plurality of fire detectors.

One of the typical fire detectors is a smoke detector (smoke detector), but the applicant first detects smoke and carbon monoxide (hereinafter referred to as "CO"). (See Patent Document 1).

According to the above-mentioned fire detector of the method of detecting smoke and CO, a fire is detected at an early stage because the fire determination process is performed based on the calculated value of the detected values of the two substances generated by the combustion of smoke and CO. (See the same document 1).

Japanese Unexamined Patent Publication No. 2001-216579

By the way, smoke detectors have the sensitivity specified by the Fire Service Act (there are 1 type, 2 types, and 3 types in descending order of sensitivity), but even the most sensitive type of smoke detector can cause a fire. Along with the smoke concentration that is determined to be fire, the smoke concentration that is not determined to be a fire is also set. A fire judgment with a smoke concentration lower than the smoke concentration judged as a fire may be a non-fire report.

In the case of the fire detector of the type that detects smoke and CO, as described above, the fire can be determined at an early stage. However, even if the smoke concentration is low, if the CO concentration is high, the fire determination may be performed. Therefore, the fire determination may be performed at a smoke concentration lower than the smoke concentration determined as a fire. That is, there is a possibility of non-fire report.

In view of the above circumstances, it is an object of the present invention to obtain a fire detector capable of detecting a fire at an early stage and preventing a non-fire alarm. Another object of the present invention is to obtain a wireless interlocking fire detection system including a plurality of fire detectors capable of doing so.

The first invention includes a smoke detection unit that detects smoke concentration and a CO detection unit that detects CO concentration, and makes a fire determination based on a calculated value of the detection value of the smoke detection unit and the detection value of the CO detection unit. In the fire detector to be performed, 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 higher than the first threshold value, the detection value of the smoke detection unit is set. The calculation of the detected value of the CO detection unit is started (claim 1).

The second invention includes a smoke detection unit that detects the smoke concentration and a CO detection unit that detects the CO concentration, and fires based on the calculated values of the detection value of the smoke detection unit and the detection value of the CO detection unit. It is a fire detector that makes a determination, and is characterized in that a calculation effective maximum value is set as a detection value of the CO detection unit used to obtain the calculation value (claim 2).

In the above invention, a CO detection threshold value is set for the detection value of the CO detection unit, and when the detection value of the CO detection unit becomes equal to or higher than the detection threshold value, the CO detection determination can be performed (claimed). Item 3).

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 performed. (Claim 4).

The third invention is a wireless interlocking fire detection system composed of a plurality of fire detectors configured so that processing is executed in conjunction with transmission and reception of wireless signals, and the plurality of fires. Each detector includes a smoke detection unit that detects the smoke concentration and a CO detection unit that detects the CO concentration, and fires based on the calculated value of the detection value of the smoke detection unit and the detection value of the CO detection unit. 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 is above the first threshold value, the smoke detection unit is configured to perform the determination. The calculation of the detection value and the detection value of the CO detection unit is started, and in the fire detection system, the detection value of the smoke detection unit in any of the fire detectors is the first by transmitting and receiving a radio signal. When the value exceeds the threshold value of, the other fire detector is also configured to start the calculation of the detection value of the smoke detection unit and the detection value of the CO detection unit (claim 5).

The fourth invention is a wirelessly interlocking fire detection system composed of a plurality of fire detectors configured so that processing is executed in conjunction with transmission and reception of a wireless signal, and the plurality of fires. Each detector includes a smoke detection unit that detects the smoke concentration and a CO detection unit that detects the CO concentration, and fires based on the calculated value of the detection value of the smoke detection unit and the detection value of the CO detection unit. A calculation-effective maximum value is set for the detection value of the CO detection unit used for the calculation while being configured to perform determination, and when the detection value of the CO detection unit exceeds the calculation-effective maximum value, The fire detection system is configured to calculate with the detection value of the smoke detection unit using the calculation effective maximum value, and the fire detection system detects the CO detection unit in any of the fire detectors by transmitting and receiving a radio signal. When the value exceeds the calculation effective maximum value, another fire detector is also configured to perform the calculation using the calculation effective maximum value (claim 6).

The fifth invention is a wirelessly interlocking fire detection system composed of a plurality of fire detectors configured so that processing is executed in conjunction with transmission and reception of a wireless signal, and the plurality of fires. Each of the detectors includes a smoke detection unit that detects the smoke concentration and a CO detection unit that detects the CO concentration, and fires based on the calculated value of the detection value of the smoke detection unit and the detection value of the CO detection unit. 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 is above the first threshold value, the smoke detection unit is configured to perform the determination. The fire detection system is configured to start the calculation of the detection value and the detection value of the CO detection unit, and the fire detection system detects the smoke detection unit in two or more predetermined number of fire detectors by transmitting and receiving a radio signal. When the value becomes equal to or higher than the first threshold value, some or all of the fire detectors are configured to give a preliminary warning of fire (claim 7).

The sixth invention is a wirelessly interlocking fire detection system composed of a plurality of fire detectors configured to execute processing in conjunction with transmission and reception of wireless signals, and the plurality of fires. Each of the detectors includes a smoke detection unit that detects the smoke concentration and a CO detection unit that detects the CO concentration, and fires based on the calculated value of the detection value of the smoke detection unit and the detection value of the CO detection unit. 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 higher than the first threshold value, the smoke detection unit is configured to perform the determination. The fire detection system is configured to start the calculation of the detection value and the detection value of the CO detection unit, and the detection value of the smoke detection unit in any of the fire detectors is the first detection value of the fire detection system by transmitting and receiving a radio signal. When the value exceeds the threshold value of, another fire detector is configured to change the communication mode of the radio signal to the reception priority mode (claim 8).

In the above invention, in the fire detection system, when one of the fire detectors makes a fire determination and gives a fire detection alarm by transmitting and receiving a radio signal, the other fire detector also gives a fire detection alarm. (Claim 9).

In the above invention, in each of the plurality of fire detectors, a second threshold value is further set for the detection value of the smoke detection unit, and the detection value of the smoke detection unit becomes equal to or higher than the second threshold value. , Can be configured to make a fire determination (claim 10).

In the first invention, when the detection value of the smoke concentration detected by the smoke detection unit is less than the first threshold value, the calculation of the detection value of the smoke detection unit and the detection value of the CO detection unit is not started, and the fire determination is performed. It will never be done. That is, the fire determination is not performed using the detected value of the smoke concentration lower than the first threshold value. As a result, even though the detection value of the smoke concentration detected by the smoke detection unit is low, it is possible to prevent the fire judgment from being performed due to the high detection value of the CO concentration detected by the CO detection unit, and it is possible to prevent a non-fire. 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 calculated effective maximum value, the actual detected value including the excess exceeding the calculated effective maximum value is not used and the calculation is performed. The maximum effective value is used to perform an operation with the detection value of the smoke detection unit, and a fire judgment is performed accordingly. That is, the fire judgment is not performed by using the actual detected value of the high CO concentration including the excess amount exceeding the effective maximum calculated value. As a result, even though the detection value of the smoke concentration detected by the smoke detection unit is low, it is possible to prevent the fire judgment from being performed due to the high detection of the CO concentration detected by the CO detection unit. Can be prevented.

Therefore, according to any of the first and second inventions, it is possible to obtain a fire detector capable of detecting a fire at an early stage and preventing a non-fire alarm.

Further, in the third, fifth and sixth inventions, the same can be applied to the first invention in each of the fire detectors. Further, in the fourth invention, the same can be applied to each of the fire detectors as in the second invention.

Therefore, according to any of the third to sixth inventions, it is possible to obtain a wireless interlocking fire detection system composed of a plurality of fire detectors capable of detecting a fire at an early stage and preventing a non-fire alarm. Can be done.

An example of the embodiment of this invention is shown, and it is a block diagram which showed the outline of the equipment structure of the fire detector. It is a flow chart which showed the operation flow of the example (1st processing mode) of the detection processing of the fire detector of the same above. It is a flow diagram which showed the operation flow of another example (second processing mode) of the same above. It is a flow diagram which showed the operation flow of another example (third processing mode) of the same above. It is a flow diagram which showed the operation flow of another example (fourth processing mode) of the same above.

An embodiment of the present invention will be described with reference to the drawings, taking as an example a case where it is applied to a residential fire alarm (hereinafter, also simply referred to as “fire alarm”). The present invention can be applied not only to residential fire alarms but also to fire detectors and the like in automatic fire alarm systems.

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

As shown in FIG. 1, the fire alarm 1 has a smoke detection unit 2 for detecting the smoke concentration, a CO detection unit 3 for detecting the CO concentration, and a control for performing various controls inside the housing (not shown). A unit 4 (having a detection processing unit 5 and an alarm processing unit 6. each function will be described later), a storage unit 7 in which various thresholds and the like are set and stored, and a display output unit 8 (fire alarm lamp 9 and CO alarm). It includes a lamp 10 (to which the lamp 10 is connected), an audio output unit 11 (to which the speaker 12 is connected), a battery 13, and the like.

Then, when the fire alarm 1 which is a residential fire alarm detects a fire, it issues the alarm. Further, as will be described later, when a high concentration of CO at a caution level is detected, a CO detection alarm can be issued. As described above, the present invention can also be applied to a fire detector of an automatic fire alarm system. In the case of the fire detector of 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 the smoke concentration. The smoke detection unit 2 is composed of, for example, a light emitting element, a light receiving element, a smoke detection unit, an optical trap, a labyrinth, and the like, and receives scattered light of the light emitting element generated by the inflow of smoke into the smoke detection unit. The photoelectric type is preferably used because it receives light and detects the concentration of smoke based on the amount of light received.

-CO detection unit The CO detection unit 3 detects the CO concentration. As the CO detection unit 3, various types of CO sensors capable of detecting the CO concentration can be used. For example, the following method can be used.
-Semiconductor type A semiconductor type CO sensor detects the CO concentration by adsorbing CO on the surface of the semiconductor and changing the resistance value due to the redox reaction.
・ ・ Electrochemical type The electrochemical type CO sensor is composed of a detection electrode, a counter electrode and an ionic conductor by a noble metal catalyst, and a battery is formed between the detection electrode and the counter electrode by reacting CO with water vapor in the air on the catalyst. , The CO concentration is detected by the potential difference.

-Control unit The control unit 4 that performs various controls includes a detection processing unit 5 and an alarm processing unit 6 as described above.
・ ・ Detection processing unit The detection processing unit 5 performs various processing such as calculation of the smoke concentration detection value detected by the smoke detection unit 2 and the CO concentration detection value detected by the CO detection unit, and comparison with various threshold values (comparison with various threshold values). The specific processing details will be explained later).
-Alarm processing unit When the detection processing unit 5 determines a fire, the alarm processing unit 6 performs fire detection alarm processing by the fire alarm lamp 9 and the speaker 12 via the display output unit 8 and the voice output unit 11 ( The fire alarm lamp 9 is turned on and blinked, and a sound and a buzzer sound are generated from the speaker 12 to issue a fire detection alarm). Further, in the case of issuing a CO detection alarm, when the detection processing unit 5 determines the CO detection, the CO detection alarm by the CO alarm lamp 10 or the speaker 12 via the display output unit 8 or the voice output unit 11 The processing (the fire alarm lamp 10 is turned on and blinked, the sound from the speaker 12 and the buzzer sound are generated, and a CO detection alarm is issued) is performed.

-Storage unit The storage unit 7 contains various threshold values and the like used for various processes of the detection processing unit 5 (smoke for fire detection / CO composite concentration threshold value (fire level threshold value) and smoke for starting calculation, which will be described later). The first threshold value of the concentration, the calculated effective maximum value of the CO concentration, the second threshold value of the smoke concentration for detecting the smoke alone, the sensing threshold value of the CO concentration for detecting the CO alone, etc.) are set and stored.

<Fire detection processing method>
Next, with reference to the operation flow charts of FIGS. 2 to 5, the first to fifth processing modes (CO sensing) are described for the characteristic fire detection processing method of the present invention adopted in the fire alarm 1. There is an aspect including a processing method), which will be described separately.

≪First processing mode (composite fire detection processing + calculation start threshold setting) ≫
-Smoke concentration and CO concentration combined fire detection processing method (fire detection processing based on the calculated value of the smoke concentration detection value and the CO concentration detection value)
In the first processing mode, the detection value of the smoke concentration detected by the smoke detection unit 2 and the detection value of the CO concentration detected by the CO detection unit 3 are calculated (for example, multiplication or the like), and the calculated value (hereinafter, "" The "sensor level") is compared with the smoke / CO composite concentration threshold value for fire detection (hereinafter, also referred to as "fire level threshold value"), and when the threshold value is exceeded, a fire is determined.

The fire alarm 1 can detect a fire at an early stage by executing this combined fire detection processing method. 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 later.

-Setting of calculation start threshold value (first threshold value of smoke concentration) Then, in the first processing mode, as a threshold value for starting calculation of the detected value of smoke concentration and the detected value of CO concentration, the first threshold value of smoke concentration is used. A threshold of 1 is set. The first threshold value and the detected value of the smoke concentration are compared, and when the value becomes equal to or higher than the first threshold value, the calculation of the detected value of the smoke concentration and the detected value of the CO concentration is started. That is, when the detected value of the smoke concentration is less than the first threshold value, the calculation of the detected value of the smoke concentration and the detected value of the CO concentration is not started.

By setting the first threshold value of the smoke concentration in the fire alarm 1, the fire determination is not performed by using the detected value of the smoke concentration lower than the first threshold value. As a result, although the detected value of the smoke concentration is low for the fire judgment, it is possible to prevent the fire judgment from being performed due to the high CO concentration detection value, and it is possible to prevent the non-fire report. ..

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

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

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

As shown in the figure, in the case of the first processing mode, from the execution of the processing start step (S1), first, the detection processing unit 5 samples the smoke concentration value detected by the smoke detection unit 2. The step (S2) and the detection step (S3) for 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 determination processing step (S4) for determining whether or not the detected value of the smoke concentration is equal to or higher than the first threshold value which is the calculation start threshold value, and when the detection value becomes equal to or higher than the first threshold value, the smoke concentration is reached. The calculation processing step (S5) of the detected value of the above and the detected value of the CO concentration is executed. Then, the detection processing unit 5 performs a determination processing step (S6) of determining whether or not the sensor level (calculated value of the smoke concentration detection value and the CO concentration detection value) is equal to or higher than the fire level threshold value (smoke / CO composite concentration threshold value). Further execution is performed, and when the sensor level becomes equal to or higher than the threshold value of the fire level, it is determined that there is a fire, and the alarm processing unit 6 executes the fire detection alarm processing step (S7).

≪Second processing mode (composite fire detection processing + setting of maximum calculation effective value) ≫
-Setting of the calculation effective maximum value (upper limit value used for the calculation) of the CO concentration In the second processing mode, instead of the first threshold value (calculation start threshold value) of the smoke concentration in the first processing mode, the above-mentioned The calculation effective maximum value is set on the CO concentration detection value side used for calculating 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 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 performed, and a fire judgment is made accordingly. That is, the fire judgment is not performed by using the actual detected value of the high CO concentration including the excess amount exceeding the effective maximum calculated value.

By setting the calculated effective maximum value of the CO concentration, the fire alarm 1 has a high detection of the CO concentration detected by the CO detection unit even though the detection value of the smoke concentration detected by the smoke detection unit is low. Therefore, it is possible to prevent a fire judgment from being made, and it is possible to prevent a non-fire alarm.

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

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

As shown in the figure, in the second processing mode, the first step is from the processing start step (S1) to the smoke concentration detection value sampling step (S2) and the CO concentration detection value sampling step (S3). The calculation processing step (S4) of the smoke concentration detection value and the CO concentration detection value by the detection processing unit 5 is executed after the execution in the same manner as in the above processing mode. At that time, the CO concentration detection value is calculated. When the effective maximum value is exceeded, the actual detected value including the excess amount exceeding the calculated effective maximum value is not used, and the calculated effective maximum value is used to perform the calculation with the detected value of the smoke detection unit. After that, as in the first processing mode, the comparison of the sensor level and the threshold value of the fire level and the judgment processing step (S5) are executed, and if it is determined to be a fire, the fire detection alarm processing step (S6) is executed. Will be done.

≪Third processing mode (composite fire detection processing + calculation start threshold setting + smoke independent detection processing) ≫
-Smoke Independent Sensing Treatment Method In the third processing mode, in addition to the first processing mode, a smoke concentration alone sensing processing method is executed. That is, in the third aspect, a second threshold value for smoke concentration is further set as a threshold value for detecting smoke alone. Then, 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 becomes equal to or higher than the second threshold value, the fire determination by the sensor level is not waited. Judged as a fire.

The fire alarm 1 further sets the second threshold value of the smoke concentration, so that even if the fire is not determined by the sensor level, if the detected value of the smoke concentration becomes equal to or higher than the second threshold value, it is determined. The fire can be judged with. That is, it is possible to prevent misreporting. Further, since the fire is determined by the second threshold value of the smoke concentration, there is an advantage that it is possible to deal with a fire in which the amount of CO generated is small. For example, when combustibles burn at once, such as when polyurethane foam or chemical fibers burn, the amount of CO generated decreases. It is possible to deal with such a fire in which the amount of CO generated is small.

That is, the fire alarm 1 can detect a fire at an early stage and prevent a non-fire alarm by executing the detection processing method of the third processing mode, and also can prevent a non-fire alarm. Can also be prevented. In addition, it can respond to various fires with different combustibles and burning methods.

The second threshold value of the smoke concentration in the third processing mode can be specifically a value of the smoke concentration which is the sensitivity of the sensitivity type under the Fire Service Act to which the fire alarm 1 belongs. By doing so, even if the fire cannot be detected at an early stage by the fire determination based on the sensor level, the fire can be detected at least with the sensitivity of the sensitivity type under the Fire Service Act.

-Operation flow of the third processing mode FIG. 4 shows an example of the processing flow leading to the fire detection alarm when the detection processing method of the third processing mode is adopted in the fire alarm 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, a determination processing step of whether or not 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 process start step (S1) to the smoke concentration detection value sampling step (S2) and the CO concentration detection value sampling step (S3) are executed in the same manner as in the first processing mode, the detection processing unit According to 5, the smoke concentration detection value is determined whether or not it is equal to or higher than the second threshold value for detecting smoke alone (S4) and the determination processing step whether or not it is equal to or higher than the first threshold value for starting calculation (S5). ) Is executed. Then, when the smoke concentration detection value becomes equal to or higher than the first threshold value, the calculation processing step (S6) of the smoke concentration detection value and the CO concentration detection value, the sensor level, and the fire are performed as in the first processing mode. The level threshold comparison and determination processing steps (S7) are sequentially executed, and if a fire is determined, the fire detection alarm processing step (S8) is executed. On the other hand, when the detected value of the smoke concentration is above the second threshold value, the 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 (composite fire detection processing + setting of maximum calculation effective value + CO independent detection processing) ≫
-CO independent sensing processing method In the fourth aspect, in addition to the sensing processing method of the second aspect, the CO independent sensing processing method is executed. That is, in the fourth aspect, the detection threshold value of the CO concentration for CO single detection is further set. The sensing threshold is set as a high concentration value exceeding the above-mentioned calculation effective maximum value, and when the detected value of the CO concentration becomes equal to or higher than the sensing threshold, it is determined to be CO sensing.

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

That is, the fire alarm 1 can detect a fire at an early stage and prevent a non-fire alarm by executing the detection processing method of the fourth processing mode, and in addition, can generate CO. It can also be sensed.

-Operation flow of the fourth processing mode FIG. 5 shows the flow of processing up to the fire detection alarm and the 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 which showed an example.

As shown in the figure, in the case of the fourth processing mode, the flow of the fire detection processing from the processing start step (S1) to the fire detection alarm processing step (S6) is the same as that of the second processing mode. However, after the execution of the sampling step of the smoke concentration detection value (S2) and the sampling step of the CO concentration detection value (S3), the CO detection process is executed in parallel with the fire detection process. That is, after executing the smoke concentration detection value sampling step (S2) and the CO concentration detection value sampling step (S3), the detection processing unit 5 sets the CO concentration detection value to CO alone as a processing flow of another system. When the determination processing step (S7) for determining whether or not the CO concentration for sensing is equal to or higher than the sensing threshold value is executed and the detected value of the CO concentration exceeds the sensing threshold value, it is determined that CO is detected, and the alarm processing unit 6 determines. The CO detection alarm processing step (S8) is executed.

<Specific examples of various threshold values, etc.>
The fire alarm 1 is a residential fire alarm, and when it corresponds to two types of sensitivity under the Fire Service Act, the required sensitivity is 10% / m as the smoke concentration. The various threshold values and the like are determined based on the smoke concentration of the required sensitivity, and can be, for example, as follows.

・ Fire level threshold (smoke / CO combined concentration threshold)
The fire level threshold can be, for example, 500 ppm ·% / m. As a result, the fire can be detected earlier than the case where the smoke concentration of 10% / m, which is the required sensitivity of two types of sensitivity, is detected alone.
The first threshold value of the smoke concentration for starting the calculation can be, for example, 5% / m. This makes it possible to prevent the required sensitivity from becoming higher than that of one type of smoke concentration of 5% / m, even though there are two types of sensitivity.
The calculated effective maximum value of the CO concentration can be, for example, 100 ppm.
-The second threshold value of the smoke concentration for detecting smoke alone can be, for example, 10% / m. As a result, even if the combined fire detection at the sensor level is not performed as prescribed, the fire detection can be performed with the required sensitivities of at least two types of sensitivity types.
-The sensing threshold of the CO concentration for CO single sensing can be, for example, 200 ppm. Symptoms such as headaches begin to appear in the human body when the CO concentration is about 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 embodiments and can be modified within the scope of the gist of the invention.

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

Specifically, the CO single 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 the sensing processing method of the first or third processing mode is adopted, CO can be further sensed.

≪Application to wireless interlocking fire alarms≫
Further, the fire alarm 1 is further provided with a means for transmitting and receiving a wireless signal, and a wirelessly interlocking fire detection system composed of a plurality of fire alarms in which processing is executed in conjunction with the transmission and reception of the wireless signal is provided. It may be configured. As an mode of interlocking processing by transmitting and receiving wireless signals, for example, the following interlocking processing can be performed. The mode of interlocking processing described here is also applicable when the present invention is applied to a fire detector in an automatic fire alarm system.

-As interlocking processing by the first threshold value of smoke concentration (calculation start threshold value) (individual fire alarm 1 uses the one in which the first threshold value of smoke concentration is set), the following interlocking processing ( The first to fourth interlocking processing modes) can be performed.

・ ・ First interlocking processing mode (calculation start processing in the interlocking destination fire alarm)
When the smoke concentration detection value in any of the fire alarms 1 becomes equal to or higher than the first threshold value, not only the fire alarm 1 but also the other fire alarms 1 have the smoke concentration detection value and the CO concentration. The calculation of the detected value of is started.
By this interlocking process, the calculation of the smoke concentration detection value and the CO concentration detection value is started not only in the interlocking source fire alarm 1 but also in all the fire alarms 1 including the interlocking destination fire alarm 1. And the fire judgment process can be performed faster.
In addition, the calculation process in the interlocking destination fire alarm 1 can be calculated by the detection value of the smoke concentration and the detection value of the CO concentration detected by each. However, as for the value on the smoke concentration side, the detection value of the interlocking source fire alarm 1 can be used, or the first threshold value can be used as the minimum value. When the first threshold value is used as the minimum value, for example, when the first threshold value is exceeded, the operation is started using the detected value, and when the first threshold value is not exceeded, the first threshold value is used. It is possible to start the calculation by using the detected value and then use the detected value when the detected value exceeds the first threshold value.

・ ・ Second interlocking processing mode (preliminary alarm processing)
When the detected value of smoke concentration in two or more predetermined number of fire alarms 1 becomes equal to or higher than the first threshold value, all the fire alarms 1 are preliminary alarms (alarms different from fire detection alarms). , Preliminary alarm before the alarm of the fire detector) shall be given.
With this interlocking process, when there is a high possibility that a fire detection alarm will be issued later, a preliminary alarm can be issued at that stage, prompting preliminary measures such as evacuation preparations. it can.
In this embodiment, specifically, for example, when the number of fire alarms 1 whose smoke concentration detection value is equal to or higher than the first threshold value has not reached a predetermined number, the information on the number of fire alarms is all fire alarms. It can be held and shared in the vessel 1. After that, when the predetermined number is reached, all the fire alarms 1 can give a preliminary alarm.
Here, in the case of general fire progress, the fire alarm 1 whose smoke concentration detection value is equal to or higher than the first threshold value determines the fire before the conditions for the preliminary alarm are met, but the fire progress is slow. In some cases, it takes time to judge the fire. Even in such a case, a fire can be detected early by issuing a preliminary alarm.
As a mode of the preliminary alarm, for example, a lamp is lit or blinking, or a buzzer sound or a voice message from a speaker is transmitted so that a fire detection alarm is likely to be issued later. It can be due to.
Further, in the case of a wireless interlocking system using a residential fire alarm 1, it is preferable that all the fire alarms 1 give a preliminary alarm as described above, but some of them depend on the conditions of the installation location. Only the fire alarm 1 may give a preliminary alarm.
Furthermore, when applied to a wireless interlocking system using fire detectors in an automatic fire alarm system, all fire detectors may give preliminary alarms, but they will be installed in large buildings such as buildings. Only some fire detectors, such as a fire detector in a specific area, for example, the same area as the fire detector whose smoke concentration detection value is equal to or higher than the first threshold, or an adjacent fire detector, are reserved. It may give an alarm.

・ ・ Third interlocking processing mode (communication mode change processing in the interlocking destination fire alarm)
When the detected value of the smoke concentration in any of the fire alarms 1 becomes equal to or higher than the first threshold value, the other fire detector 1 changes the communication mode in the radio signal transmitting / receiving means to the reception priority mode. (For example, reduce the frequency of transmission to make it easier to receive).
By this interlocking process, the interlocking destination fire alarm 1 can receive the radio signal from the interlocking source fire alarm 1 faster, and the interlocking process can be performed faster.

・ ・ Fourth interlocking processing mode (processing for changing the sampling cycle in the interlocking destination fire alarm)
When the detected value of the smoke concentration in any of the fire alarms 1 becomes equal to or higher than the first threshold value, the other fire alarm 1 determines the smoke concentration of the smoke detection unit 2 and / or the CO concentration of the CO detection unit 3. The sampling cycle shall be accelerated.
By this interlocking process, the smoke detection unit 2 and / or the CO detection unit 3 can perform the detection process faster in the interlocking destination fire alarm 1, and the subsequent arithmetic processing and fire determination processing can be performed earlier. Can be done.

-As interlocking processing based on the calculated effective maximum value of CO concentration (for each fire alarm 1, the one in which the calculated effective maximum value of CO concentration is set is used), the following interlocking processing (fifth interlocking processing) is performed. Aspects) can be performed.

・ ・ Fifth interlocking processing mode (use of the maximum calculation effective value in the interlocking destination fire alarm)
When the detected value of the CO concentration in any of the fire alarms 1 exceeds the calculated effective maximum value, not only the fire alarm 1 that exceeds the calculated effective maximum value but also the other fire alarm 1 also has the calculated effective maximum value. The value shall be used to calculate the smoke concentration detection value.
By this interlocking process, not only the interlocking source fire alarm 1 but also all the interlocking destination fire alarms 1 including the interlocking destination fire alarm 1 use the calculated effective maximum value to be used with the smoke concentration detection value. The calculation can be performed, and the fire can be detected at an early stage.

-Combination of interlocking processing The above-mentioned first to fifth interlocking processing modes can be executed in combination within a range that does not cause a contradiction. Further, in each mode, when one of the fire alarms 1 makes a fire determination and gives a fire detection alarm, the other fire alarm 1 also gives a fire detection alarm, which is executed in combination with the interlocking process. Can be done.

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

Claims (10)

It is a fire detector that has a smoke detection unit that detects smoke concentration and a CO detection unit that detects CO concentration, and makes a fire judgment based on the calculated values of the detection value of the smoke detection unit and the detection value of the CO detection unit. hand,
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 higher than the first threshold value, the detection value of the smoke detection unit and the detection value of the CO detection unit A fire detector characterized in that the calculation is started. It is a fire detector that has a smoke detection unit that detects smoke concentration and a CO detection unit that detects CO concentration, and makes a fire judgment based on the calculated values of the detection value of the smoke detection unit and the detection value of the CO detection unit. hand,
A fire detector characterized in that a calculated effective maximum value is set as a detected value of the CO detection unit used to obtain the calculated value. The first or second claim, wherein a CO detection threshold value is set for the detection value of the CO detection unit, and when the detection value of the CO detection unit becomes equal to or higher than the detection threshold value, a CO detection determination is performed. Fire detector. 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 performed. The fire detector described in either. A wireless interlocking fire detection system consisting of multiple fire detectors that are configured to perform processing in conjunction with the transmission and reception of wireless signals.
Each of the plurality of fire detectors includes a smoke detection unit that detects smoke concentration and a CO detection unit that detects CO concentration, and is a calculated value of a detection value of the smoke detection unit and a detection value of the CO detection unit. 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 is above the first threshold value, the fire is determined based on the above. It is configured to start the calculation of the detection value of the smoke detection unit and the detection value of the CO detection unit.
In the fire detection system, 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 by transmitting and receiving radio signals, the other fire detectors also use the detection value of the smoke detection unit. A wireless interlocking fire detection system characterized in that it is configured to start calculation of a detection value of the CO detection unit. A wireless interlocking fire detection system consisting of multiple fire detectors that are configured to perform processing in conjunction with the transmission and reception of wireless signals.
Each of the plurality of fire detectors includes a smoke detection unit that detects smoke concentration and a CO detection unit that detects CO concentration, and is a calculated value of a detection value of the smoke detection unit and a detection value of the CO detection unit. A fire determination is performed based on the above, and a calculation effective maximum value is set for the detection value of the CO detection unit used in the calculation, and the detection value of the CO detection unit is the calculation effective maximum value. When the value exceeds, the calculation is performed with the detection value of the smoke detection unit using the calculation effective maximum value.
In the fire detection system, when the detection value of the CO detection unit in any of the fire detectors exceeds the calculation effective maximum value by transmitting and receiving radio signals, the other fire detectors also use the calculation effective maximum value. A wireless interlocking fire detection system characterized in that it is configured to perform the above calculation. A wireless interlocking fire detection system consisting of multiple fire detectors that are configured to perform processing in conjunction with the transmission and reception of wireless signals.
Each of the plurality of fire detectors includes a smoke detection unit that detects smoke concentration and a CO detection unit that detects CO concentration, and is a calculated value of a detection value of the smoke detection unit and a detection value of the CO detection unit. 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 is above the first threshold value, the fire is determined based on the above. It is configured to start the calculation of the detection value of the smoke detection unit and the detection value of the CO detection unit.
In the fire detection system, 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 by transmitting and receiving radio signals, some or all of the fire detectors are affected. A wireless interlocking fire detection system characterized by being configured to give a preliminary fire alarm. A wireless interlocking fire detection system consisting of multiple fire detectors that are configured to perform processing in conjunction with the transmission and reception of wireless signals.
Each of the plurality of fire detectors includes a smoke detection unit that detects smoke concentration and a CO detection unit that detects CO concentration, and is a calculated value of a detection value of the smoke detection unit and a detection value of the CO detection unit. 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 higher than the first threshold value, the fire is determined based on the above. It is configured to start the calculation of the detection value of the smoke detection unit and the detection value of the CO detection unit.
In the fire detection system, 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 by transmitting and receiving a radio signal, the other fire detector gives priority to receiving the communication mode of the radio signal. A wireless interlocking fire detection system characterized by being configured to change to the mode of. The fire detection system is configured so that when one of the fire detectors makes a fire judgment and gives a fire detection alarm by transmitting and receiving a radio signal, the other fire detector also gives a fire detection alarm. The wirelessly interlocking fire detection system according to any one of claims 5 to 8, wherein the fire detection system is characterized by the above. Each of the plurality of fire detectors makes a fire determination when a second threshold value is further set for the detection value of the smoke detection unit and the detection value of the smoke detection unit becomes equal to or higher than the second threshold value. The wireless interlocking fire detection system according to any one of claims 5 to 9, wherein the fire detection system is configured as described above.

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