JP2006277138A - Fire alarm unit or fire detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire alarm unit or a fire detecting device for much more accurately providing fire occurrence in the initial stage. <P>SOLUTION: This fire alarm unit 10 for monitoring a fire based on the status of predetermined physical quantity in a predetermined monitor region is provided with a smoke sensing part 11 for detecting smoke, a CO sensing part 12 for detecting CO and a control part 16 for judging that a fire has occurred when the change rate of smoke detected by the smoke sensing part 11 or the change rate of CO detected by the CO sensing part 12 exceeds a predetermined threshold. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  More particularly, the present invention relates to a fire alarm or a fire detection device capable of more accurately detecting a fire occurrence at an initial stage.

  In order to protect buildings and human lives from house fires, it is effective to install fire detectors that detect fires early and issue warnings. This fire detector detects a physical quantity such as heat, smoke, or CO generated by a fire, and notifies the occurrence of a fire when the detected physical quantity is equal to or greater than a threshold value. As such a fire sensor, a single sensor that detects only one type of physical quantity, or a composite type sensor that detects a plurality of types of physical quantities has been proposed.

  In recent years, fire detectors have been proposed that increase the speed of fire detection. For example, a composite sensor has been proposed that detects heat and smoke in a monitoring area and changes the threshold for smoke based on the detected heat. Specifically, in this fire detector, when the detected temperature exceeds room temperature, the threshold value for smoke is reduced, and when the detected temperature is lower than room temperature, the threshold value for smoke is increased. Therefore, in the former case, the detected amount of smoke easily exceeds the threshold value, so that the occurrence of a fire can be notified more quickly (see, for example, Patent Document 1).

  However, in the fire detector that changes the threshold value in this way, the smoke threshold value is changed based on the temperature of the monitoring area, so in an environment where the temperature state and the fire state do not correspond to each other, There was a possibility that the occurrence of an error could not be detected quickly or a false alarm was generated.

  For example, as a case where the temperature state and the fire state do not correspond to each other, a case where a smoldering fire has occurred can be considered. That is, the fire is roughly classified into a general fire in which a flame is generated when the fire is generated and a smoldering fire in which the flame is hardly generated in the initial stage of the fire. A general fire is a fire that occurs due to, for example, an abnormal heating due to a fall or failure of a heating device, and a flame is generated from the beginning of the fire, which may generate heat, smoke, and CO. It is a feature. On the other hand, firewood fire, for example, is a fire in which the futon is burned by cigarette ash falling on the futon. In the early stage of the fire, flames and smoke rarely occur and mainly CO is generated. It is a feature. In such a smoldering fire, there is little heat generation at the initial stage of the fire, so the fire detector described in Patent Document 1 described above may not be able to appropriately set the threshold value for smoke.

  Moreover, as a case where the temperature state does not correspond to the fire state other than the firewood fire, a case where the temperature in the monitoring area is adjusted by the air conditioner can be considered. In this case, since the temperature rises even though no fire has occurred, the smoke threshold is changed, and there is a possibility that false alarms are likely to occur. In particular, when smoke or CO is generated from an air conditioner, the possibility of misreporting is further increased by detecting the smoke and CO with a fire detector.

  Therefore, a fire detector aimed at solving such problems has also been proposed. For example, the value of heat, smoke, and CO when a firewood fire broke out and its change with time are the values of heat, smoke, and CO when a combustion device such as a gas stove is operating and its change with time. Therefore, by determining the presence or absence of a fire based on the values of heat, smoke, and CO, and their changes over time, the influence of combustion equipment such as a gas stove on the process for determining the occurrence of a fire is reduced. There has also been proposed a fire detector that can be used (for example, see Patent Document 2).

JP 11-312286 A JP 2004-341661 A

  However, such a conventional fire detector indirectly determines the operating state of a combustion device such as a gas stove based on the value of a physical quantity such as heat, smoke, or CO and changes over time. There was a possibility that the state was erroneously determined and a false alarm still occurred. For example, when a door of a room that is a monitoring target area is opened, a physical quantity such as heat, smoke, or CO is diffused to another room through the door. Indirect determination based on a predetermined physical quantity diffused and thinned in this way may erroneously determine the operating state of the combustion equipment, and may cause false alarms.

  The present invention has been made in view of the above, and it is possible to more accurately detect the occurrence of a fire at the initial stage by more directly grasping the operating state of the combustion equipment, etc. Or it aims at providing a fire detection device.

  In order to solve the above-described problems and achieve the object, the fire alarm according to claim 1 is a fire alarm that monitors a fire based on a state of a predetermined physical quantity in a predetermined monitoring area, A first detecting means for detecting a predetermined first physical quantity; a second detecting means for detecting a predetermined second physical quantity; and a change in the first physical quantity detected by the first detecting means. Control means for determining that a fire has occurred when the rate or the rate of change of the second physical quantity detected by the second detection means exceeds a predetermined threshold value. And

  Further, the fire alarm device according to claim 2 is installed in each of the two or more levels in the multi-level in order to monitor the fire based on the state of the predetermined physical quantity in the predetermined monitoring area in the multi-level. A fire alarm, a detection means for detecting a predetermined physical quantity in a hierarchy where the fire alarm is arranged, and a hierarchy in which the fire alarm is installed when the physical quantity is detected by the detection means Other fire alarms installed at levels other than the above include control means for determining that a fire has occurred when the physical quantity is detected.

  The fire detection device according to claim 3 is provided for a first sensor that monitors a state of a predetermined physical quantity in a predetermined monitoring area and a combustion device installed in the predetermined monitoring area. A fire detection device connected to be communicable, which receives the monitoring result of the first sensor and the operation information for confirming the operation state of the combustion device, and based on the monitoring result and the operation information, Control means for performing predetermined control regarding the presence or absence of the occurrence of a fire in the predetermined monitoring area is provided.

  The fire detection device according to claim 4 is the fire detection device according to claim 3, wherein the fire detection device is installed in a ventilation path that communicates with each of the plurality of monitoring regions, and the predetermined physical quantity of The control means is communicatively connected to a second sensor for monitoring a state, and the control means receives a monitoring result of the second sensor, and based on the monitoring result of the second sensor, the predetermined sensor Predetermined control relating to the presence or absence of a fire in the monitoring area is performed.

  Further, the fire detection device according to claim 5 is the fire detection device according to claim 3 or 4, wherein the control means is configured such that the predetermined physical quantity is a first value based on a monitoring result of the first sensor. When it is confirmed that the value is equal to or greater than the threshold value, the operating state of the combustion device is confirmed based on the operation information.

  Further, the fire detection device according to claim 6 is the fire detection device according to claim 5, wherein when the control means confirms that the combustion device is not in operation, the fire detection device within the predetermined monitoring area. It is determined that a fire has occurred.

  The fire detection device according to claim 7 is the fire detection device according to claim 5, wherein the control means confirms that the combustion device is not in operation, and monitors the second sensor. When it is confirmed that the predetermined physical quantity is greater than or equal to the second threshold based on the result, it is determined that a fire has occurred in the predetermined monitoring area.

  Further, the fire detection device according to claim 8 is the fire detection device according to any one of claims 3 to 7, wherein the control unit is configured to check the operation information for confirming an operation state of the combustion device. Based on the above, a change of a predetermined threshold value for the monitoring result is controlled.

  The fire detection device according to claim 9 is the fire detection device according to any one of claims 4 to 8, wherein the fire detection device communicates the monitoring region and the ventilation path so as to be openable and closable. The control means is communicably connected to the open / close lid to be opened, and the control means is configured to open and close the open / close based on the monitoring result of the first sensor, the monitoring result of the second sensor, or the operation information. Controlling the opening and closing of the lid.

  The fire detection device according to claim 10 is the fire detection device according to any one of claims 3 to 9, wherein the first sensor detects smoke in the monitoring area. Sensing means, and compensation means for compensating so as to reduce the amount of smoke detected by the smoke sensing means under a predetermined condition, CO generation in the monitoring area is sensed by the prescribed means, and the smoke sensing means is Control means for disabling the compensation means when smoke generation is not sensed is provided.

  According to the present invention, even if the detected amount of smoke or CO does not exceed the threshold value, a fire alarm can be issued if the change rate of smoke or CO exceeds the threshold value. For this reason, even a fire that generates little smoke at the beginning of the fire, such as a firewood fire, can be detected and alarmed at an early stage.

  Further, according to the present invention, even when the detected amount of smoke or CO does not exceed the threshold value, a fire alarm can be given if smoke or CO is detected on other floors. . For this reason, even a fire that generates little smoke at the beginning of the fire, such as a firewood fire, can be detected and alarmed at an early stage.

  Moreover, according to this invention, since the combustion equipment is communicably connected to the fire detection device, the fire detection device can directly grasp the operating status of the combustion equipment. For this reason, in the process of determining the occurrence of a fire by the fire detection device, the influence of a predetermined physical quantity that is secondary generated from this combustion device is considered for the monitoring result of the first sensor. The determination of the occurrence of a fire can be made more accurately than before without being affected by disturbance.

  According to the present invention, in addition to the monitoring result of the first sensor installed in the predetermined monitoring area and the operating state of the combustion equipment, the monitoring of the second sensor installed in the ventilation path communicating with the monitoring area is further performed. Based on the result, a fire occurrence determination process is performed by the fire detection device. Therefore, the fire occurrence determination process is performed based on more information, and the fire detection device can more accurately determine the fire occurrence.

  According to this invention, when it is confirmed that the predetermined physical quantity is equal to or greater than the first threshold based on the monitoring result of the first sensor, the operating state of the combustion device is confirmed based on the operating information. In other words, if any abnormality is confirmed by the first sensor but it cannot be determined that a fire has occurred, the operation state of the combustion equipment is confirmed, and the fire occurrence determination process is performed after taking into account the confirmed operation status. Done. Therefore, the fire detection device can more accurately determine the occurrence of a fire in consideration of the operation status of the combustion equipment.

  According to the present invention, the predetermined threshold for the monitoring result is changed according to a situation in which the first sensor and the second sensor cannot be grasped, that is, the operating state of the combustion equipment. Therefore, the predetermined threshold value for the monitoring result is appropriately changed to an appropriate value, and the fire detection device can more accurately determine the occurrence of the fire.

  According to the present invention, air is exhausted from the selected monitoring region to the ventilation path only by the control of the opening / closing lid, and the second sensor monitors only the air exhausted from the selected monitoring region. Therefore, it is possible to eliminate the influence of the air in the monitoring area not selected on the air exhausted from the selected monitoring area, and the fire detection device can more accurately determine the occurrence of a fire.

  According to this invention, when the CO sensing means of the first sensor senses CO and the smoke sensing means does not sense smoke, the smoke sensitivity compensator of the smoke sensing means is disabled, It is possible to increase the sensitivity of smoke detection in the determination unit of the sensor. As a result, it is possible to detect a slight amount of smoke that is generated in the early stage of the smoldering fire, and the fire detection device can quickly detect the occurrence of the fire.

[Basic concept of each embodiment]
First, the basic concept of a fire alarm or a fire detection device according to each embodiment of the present invention will be described. The fire alarm and the fire detection device according to each embodiment roughly detect a fire in the monitoring area and perform an alarm or the like. Here, the specific form of the monitoring area is arbitrary, and may be, for example, a building or a warehouse. In each of the following embodiments, a case where the monitoring area is a general household will be described. Also, the type of fire alarm is arbitrary. For example, a fire alarm that detects smoke and emits a fire alarm, a gas leak alarm that detects methane, or an incomplete combustion alarm that detects CO. A gas leak alarm can be provided. Each embodiment will be described by taking as an example the case of providing a composite fire alarm with a smoke detector and a CO detector.

  Under such a premise, an object of the present invention is to detect a fire quickly and accurately even in an environment where a temperature state and a fire state do not correspond to each other in addition to a normal fire environment. In other words, it may be difficult to determine the occurrence of a fire because the timing of CO and smoke generation is different, but even in such a case, the fire detection device of each embodiment makes a quick and accurate determination. Can do. FIG. 1 is a conceptual diagram showing the transition of the amount of smoke and CO generated in the case of a firewood fire. For example, in the case of firewood fire, as shown in FIG. 1, almost no smoke is generated at the initial stage of the fire, and only CO is generated, and for a while, only the amount of CO generated gradually increases (step 1). When the time elapses, the amount of smoke generated increases rapidly (stage 2). When such a fire occurs, it is considered that there is a possibility that a smoldering fire has occurred and that the combustion equipment is operating and discharging CO, and it is difficult to judge.

  Therefore, in the fire alarm device according to the first embodiment, attention is paid to the difference in the rate of change in the amount of CO and smoke generated, and a fire is determined based on this rate of change.

  In addition, in the smoldering fire, smoke drifts in the vicinity of the fire source and does not diffuse, whereas CO rises above the vicinity of the fire source. Using this phenomenon, in the fire alarm of the second embodiment, in addition to detecting CO and smoke in the lower layer of the multi-layer building, CO is also detected in the upper layer, and based on the detection results in these two layers. Determine the fire.

  Furthermore, in the third to fifth embodiments, the fire detection device is linked to the combustion equipment, and the operation status of the combustion equipment is appropriately obtained in the fire detection device, so that the cause of CO generation is a fire or the combustion of the combustion equipment. It is judged whether it is.

  Furthermore, the fire detection devices of Embodiments 3 to 5 can improve the determination accuracy of the occurrence of fire by using a ventilation system installed indoors. For example, a CO detector is placed in the ventilation pipe of the ventilation system and linked to a fire detection device. And the fire detection apparatus of each embodiment makes it possible to determine the presence or absence of a fire based on the information from the CO detector, the fire alarm in each room, and the combustion equipment in each room.

  Furthermore, in Embodiments 3 to 5, the accuracy of determining the occurrence of a fire by the fire detection device is further improved by adding another function to the ventilation system. For example, a lid that can be opened and closed is provided at the vent of a room of the ventilation system, and this is linked to the fire detection device. Based on information from the CO detector in the vent pipe, the fire alarm in each room, and the combustion equipment in each room, the lid opens and closes and the air flow is adjusted to ensure a more reliable fire. It is possible to determine whether or not there is.

[Embodiment 1]
Hereinafter, a fire alarm device according to Embodiment 1 will be described in detail with reference to the accompanying drawings.

(Configuration of fire alarm)
First, the configuration of the fire alarm will be described. FIG. 2 is an indoor layout diagram of the fire alarm device according to the first embodiment, and FIG. 3 is a block diagram functionally conceptually showing the configuration of the fire alarm device. The fire alarm 10 is attached to each room such as a general house and constantly monitors the state of a predetermined physical quantity such as smoke or CO in each room. As shown in FIG. 3, the fire alarm 10 includes a smoke detection unit 11, a CO detection unit 12, a determination unit 13, an alarm unit 14, a transmission / reception unit 15, and a control unit 16.

  Here, the smoke detection unit 11 is smoke detection means for detecting smoke in the room, and includes, for example, a smoke sensor. The CO sensing unit 12 is CO sensing means for sensing the CO in the room, and includes, for example, a CO sensor. Further, the determination unit 13 is stored in the determination unit 13 in advance, and the detection amount (predetermined physical amount) of smoke and CO from the smoke detection unit 11 and the CO detection unit 12 and the rate of change of the detection amount per predetermined time. On the basis of each threshold value, a determination means for determining whether or not the predetermined physical quantity or the rate of change thereof is equal to or greater than the threshold value, for example, includes an IC and a program executed on the IC.

  The alarm unit 14 is an alarm unit that issues an alarm based on the determination result of the determination unit 13, and includes, for example, a buzzer and a speaker. In addition, when the determination unit 13 determines that the smoke is equal to or greater than the threshold value, the transmission / reception unit 15 transmits and transmits a smoke detection signal indicating that to the other fire alarm 10, and the determination unit 13 If the CO is determined to be greater than or equal to the threshold value, the transmission / reception means transmits a CO detection signal indicating that and receives information from other fire alarms 10 as necessary. The wireless type has an antenna, and the wired type has a connector. The control unit 16 controls each unit of the fire alarm 10 and corresponds to the control means in the claims, and includes, for example, an IC and a program executed on the IC.

(Fire detection method)
Hereinafter, a method in which the fire alarm 10 detects a fire will be described. FIG. 4 is a flowchart of the determination process of the fire alarm device 10. First, the fire alarm 10 in each room monitors whether or not smoke is detected (step S1). This monitoring is performed, for example, by determining whether or not the amount of smoke detected by the smoke detection unit 11 exceeds a predetermined minimum threshold preset in the determination unit 13. If no smoke is detected (No at Step S1), the fire alarm 10 monitors whether CO is detected (Step S2). This monitoring is performed, for example, by determining whether or not the amount of CO detected by the CO detection unit 12 exceeds a predetermined minimum threshold preset in the determination unit 13. And when CO is not sensed (step S2, No), it returns to step S1 and continues monitoring of smoke.

  If CO is detected in step S2 (step S2, Yes), it is further determined whether or not the detected amount of CO exceeds a predetermined threshold value indicating the occurrence of a fire (step S3). If the detected amount of CO exceeds the threshold (step S3, Yes), it is determined that a fire has occurred, and a fire alarm is given (step S5). Specifically, a fire alarm is issued, and a CO detection signal or the like is transmitted by wire or wireless so as to issue a fire alarm to the fire alarms 10 in all rooms, and other fire alarms having received this The device 10 issues a fire alarm.

  On the other hand, if the CO sensing amount does not exceed the threshold value in step S3 (step S3, No), it is determined whether or not the rate of change of the CO sensing amount per predetermined time exceeds a predetermined threshold value. (Step S4). For example, the time is measured by a timer (not shown), the CO sensing amount for each time is stored in a storage unit (not shown), and the previous sensing amount is called from the storage unit every predetermined time. This can be done by calculating the amount of change. If the rate of change exceeds the threshold value (Yes in step S4), a smoldering fire occurs even if smoke is not detected and the detected amount of CO does not exceed the predetermined threshold value. The fire alarm is issued (step S5).

  FIG. 5 is a conceptual diagram showing the transition of the amount of smoke and CO generated in the case of a firewood fire. As shown in FIG. 5, when the fire determination is made based only on the CO sensing amount, a fire alarm cannot be generated unless the time t2 when the sensing amount exceeds the CO threshold value. On the other hand, when the change rate of CO is taken into consideration, the change rate of the CO sensing amount between these points exceeds the threshold at time t0 to time t1, so that it is earlier than time t2. A fire alarm can be issued at time t1. As described above, according to the fire alarm device 10 according to the first embodiment, even a fire that generates a small amount of smoke in the early stage of fire such as a smoldering fire can be detected and alarmed at an early stage. Can do.

  In FIG. 4 again, when it is determined that smoke is detected in step S1 (step S1, Yes), the fire alarm 10 further determines whether the detected amount of smoke exceeds a predetermined threshold value indicating the occurrence of a fire. It is determined whether or not (step S6). If the detected amount of smoke exceeds the threshold (Yes in step S6), it is determined that a fire has occurred, and a fire alarm is given (step S5). Specifically, the fire alarm is issued, and a smoke detection signal or the like is transmitted by wire or wireless so that the fire alarm is issued to the fire alarms 10 in all rooms, and other fire alarms that have received this are received. The device 10 issues a fire alarm.

  On the other hand, if the smoke detection amount does not exceed the threshold value in step S6 (No in step S6), as in step 4, whether the rate of change of the CO detection amount per predetermined time exceeds the predetermined threshold value. It is determined whether or not (step S7). If the rate of change of CO exceeds the threshold value (step S7, Yes), it is determined that a smoldering fire has occurred even if the smoke detection amount does not exceed the predetermined threshold value. An alarm is issued (step S5).

  Here, as shown in FIG. 5, when the fire determination is performed based only on the smoke detection amount, a fire alarm cannot be generated unless the time t3 when the detection amount exceeds the smoke threshold. On the other hand, when the change rate of CO is taken into consideration, the change rate of the CO sensing amount between these points exceeds the threshold at time t0 to time t1, so that it is earlier than time t3. A fire alarm can be issued at time t1. Thus, according to the fire alarm device 10 according to the first embodiment, even when the detected amount of smoke or CO does not exceed the threshold, the change rate of CO exceeds the threshold. Fire alarm can be done. For this reason, even a fire that generates little smoke at the beginning of the fire, such as a firewood fire, can be detected and alarmed at an early stage.

[Embodiment 2]
Next, the fire alarm device according to the second embodiment will be described in detail. In addition to detecting CO and smoke at the lower level of the multi-layer building, the fire alarm device according to the second embodiment also detects CO at the upper level and determines fire based on the detection results at both levels. To do. Note that structures and processes that are not particularly described are the same as those in the first embodiment described above, and the same structures and processes will be described with the same reference numerals.

(Configuration of fire alarm)
First, the configuration of the fire alarm will be described. FIG. 6 is an indoor layout diagram of the fire alarm device according to the second embodiment, and FIG. 7 is a block diagram functionally conceptually showing the configuration of the fire alarm device. As shown in FIG. 7, the fire alarm 17 includes a smoke detection unit 11, a CO detection unit 12, a determination unit 13, an alarm unit 14, a transmission / reception unit 15, and a control unit 18. Among these, the control part 18 controls each part of the fire alarm device 17, corresponds to the control means in the claims, and has, for example, an IC and a program executed on the IC.

(Fire detection method)
Hereinafter, a method in which the fire alarm 17 detects a fire will be described. In the following, the fire judgment process of the fire alarm 17 arranged on the first floor will be described, and the fire judgment process of the fire alarm 17 arranged on the second floor will be described as “first floor” and “second floor” in the following process. The explanation is omitted because it is the same as those obtained by replacing each other word.

  FIG. 8 is a flowchart of the determination process of the fire alarm device 17. First, the fire alarm 17 on the first floor monitors whether or not smoke is detected on the first floor (step S10), similarly to step S1 in FIG. If smoke is not sensed (step S10, No), the fire alarm 17 monitors whether or not CO has sensed CO on the first floor (step S2 in FIG. 4) (step S2). S11). And when CO is not sensed (step S11, No), it returns to step S10 and continues monitoring of smoke.

  If CO is detected in step S11 (step S11, Yes), it is further determined whether or not the detected amount of CO has exceeded a predetermined threshold value indicating the occurrence of a fire (step S12). If the detected amount of CO exceeds the threshold (step S12, Yes), it is determined that a fire has occurred, and a fire alarm is given as in step 5 of FIG. 4 (step S14).

  On the other hand, if the detected amount of CO does not exceed the threshold value in step S12 (step S12, No), it is further determined whether or not CO is detected in another fire alarm 17 installed on the second floor. Judgment is made (step S13). This determination is made, for example, by transmitting a request signal including the address of the fire alarm 17 on the second floor to each fire alarm 17 and at the time when the request signal is transmitted from the fire alarm 17 on the second floor that has received this request signal. It is executed by receiving a CO sensing amount. If CO is not detected in the fire alarm 17 on the second floor (No at Step S13), it is determined that no fire has occurred, and the process returns to Step S10 to continue monitoring smoke.

  On the other hand, when CO is detected in the fire alarm 17 on the second floor (step S13, Yes), smoke is not detected on the first floor, and the detected amount of CO on the first floor exceeds the threshold. Even if not, it is determined that CO has risen to the second floor as a result of the occurrence of CO due to the smoldering fire, and a fire alarm is given (step S14). FIG. 9 is a conceptual diagram showing the transition of the amount of smoke and CO generated in the case of a firewood fire. As shown in FIG. 9, when the fire determination is made based only on the CO sensing amount on the first floor, a fire alarm can be generated unless the sensing time t2 when the sensing amount exceeds the CO threshold value. In addition, when a fire determination is made based only on the smoke detection amount on the first floor, a fire alarm cannot be generated unless the time t3 when the detection amount exceeds the smoke threshold. On the other hand, in the above process, a fire alarm can be given at time t0 when CO is detected on both the first and second floors. As described above, according to the fire alarm device 17 according to the second embodiment, even a fire that generates little smoke at the early stage of fire such as a smoldering fire can be detected and alarmed at an early stage. Can do.

  Again, in FIG. 8, when it is determined in step S10 that smoke has been detected (step S10, Yes), the fire alarm 17 further determines whether the detected amount of smoke has exceeded a predetermined threshold value indicating the occurrence of a fire. It is determined whether or not (step S15). If the detected amount of smoke exceeds the threshold (Yes in step S15), it is determined that a fire has occurred and a fire alarm is given (step S14).

  On the other hand, if the detected amount of smoke does not exceed the threshold value in step S15 (step S15, No), as in step 13, it is determined whether or not CO is detected by the fire alarm 17 on the second floor ( Step S16). If CO is detected on the second floor (step S16, Yes), even if the detected amount of smoke does not exceed the predetermined threshold, it is determined that a smoldering fire has occurred, and a fire alarm is issued. A notification is issued (step S14).

  As described above, according to the fire alarm device 17 according to the second embodiment, even when the detected amount of smoke or CO does not exceed the threshold value, when CO is detected on the second floor as well. Fire alarm can be done. For this reason, even a fire that generates little smoke at the beginning of the fire, such as a firewood fire, can be detected and alarmed at an early stage.

[Embodiment 3]
Hereinafter, a fire detection device according to the third embodiment will be described in detail with reference to the accompanying drawings. In the fire detection device according to the third embodiment, the fire detection device is linked to the combustion equipment, and the operation status of the combustion equipment is appropriately obtained in the fire detection device, so that the cause of CO generation is fire or the combustion equipment It is judged whether it is combustion. Note that structures and processes that are not particularly described are the same as those in the first embodiment described above, and the same structures and processes will be described with the same reference numerals.

(Configuration of fire detection system)
First, the basic configuration of the fire detection system will be described. FIG. 10 is an indoor layout diagram of the fire detection system provided with the fire detection device according to the third embodiment, and FIG. 11 is a system block diagram thereof. Here, a fire detection system 1, a ventilation system 2, and a combustion device 3 are provided in each room of a general household.

  Among these, the fire detection system 1 is for detecting the occurrence of a fire in each room, and generally includes a fire alarm device 4, a high-sensitivity CO detector 5, and a fire detection device 6. Has been. However, details of these devices will be described later.

(Ventilation system configuration)
The ventilation system 2 is a ventilation means for collecting the air in each room in one place and discharging it to the outside, and for sucking the outdoor air into each room. The ventilation system 2 includes a vent pipe 21, a vent hole 22, and a vent hole 23. Here, the vent pipe 21 is a vent pipe line that communicates each room with the outside. For example, the vent pipe 21 is provided in a space such as an indoor ceiling and is connected to the vent 22 and the vent 23. The vent pipe 21 corresponds to a vent path in the claims. The vent 22 is an opening through which air in each room passes to the vent pipe 21 and is provided, for example, on a wall near the ceiling of each room. For example, an exhaust fan 24 that forcibly exhausts air to the vent pipe 21 is provided in the vent hole 22. The vent 23 is an opening that collects air collected from each room and discharges the air to the outdoors. For example, the vent 23 is provided on the outer wall. For example, an exhaust fan 25 that forcibly discharges air to the outside is provided in the vent 23.

(Combustion equipment configuration)
In FIG. 11, the combustion device 3 is an arbitrary device that can be an emission source of smoke and CO, and corresponds to the combustion device in the claims. The combustion device 3 is provided in all or an arbitrary part of each room, and corresponds to, for example, a heating device or a cooking device, more specifically, a gas stove, a gas heater, an oil heater, or the like. As shown in FIG. 11, the combustion device 3 includes a combustion unit 31, a transmission / reception unit 32, and a control unit 33. Here, the combustion part 31 is a combustion means which burns oil and gas, for example, has a burner. The transmission / reception unit 32 is a transmission / reception means for transmitting the operation state of the combustion device 3 to the fire detection device 6 and receiving an inquiry from the fire detection device 6. For example, in the case of a wireless system, an antenna, a wired system Case has a connector. Moreover, the control part 33 is a control means which controls each part of the combustion apparatus 3, for example, has IC and the program run on this IC.

(Configuration of fire alarm)
Next, details of the fire alarm 4, the high-sensitivity CO detector 5, and the fire detection device 6 of the above-described fire detection system 1 will be described. In FIG. 10, the fire alarm 4 constantly monitors the state of a predetermined physical quantity such as smoke or CO in each room, and corresponds to the first sensor in the claims. As shown in FIG. 11, the fire alarm 4 includes a smoke detection unit 41, a CO detection unit 42, a determination unit 43, an alarm unit 44, a transmission / reception unit 45, and a control unit 46. Here, the smoke detection unit 41 is smoke detection means for detecting smoke in the room, and includes, for example, a smoke sensor. The CO sensing unit 42 is CO sensing means for sensing the CO in the room, and includes, for example, a CO sensor. The determination unit 43 also determines the predetermined amount based on the smoke and CO detection amounts (predetermined physical amounts) from the smoke detection unit 41 and the CO detection unit 42 and the threshold value stored in the determination unit 43 in advance. A determination unit that determines whether or not the physical quantity is greater than or equal to a threshold, and includes, for example, an IC and a program executed on the IC. This threshold value corresponds to the first threshold value in the claims.

  The alarm unit 44 is an alarm unit that issues an alarm based on the determination result of the determination unit 43, and includes, for example, a buzzer and a speaker. In addition, when the determination unit 43 determines that the smoke is equal to or greater than the threshold value, the transmission / reception unit 45 transmits a smoke detection signal indicating that fact and an address number assigned in advance to the fire alarm 4. When the determination unit 43 determines that the CO is equal to or greater than the threshold value, a CO detection signal and an address number indicating that are transmitted, and information from the fire detection device 6 is received as necessary. For example, the wireless type has an antenna, and the wired type has a connector. Moreover, the control part 46 is a control means which controls each part of the fire alarm 4 and has, for example, an IC and a program executed on the IC.

(Configuration of high sensitivity CO detector)
In FIG. 10, a high-sensitivity CO detector 5 is provided in the vicinity of the vent 23 in order to intensively monitor the state of CO of air exhausted from each room at all times. Corresponds to the second sensor in the range. As shown in FIG. 11, the high-sensitivity CO detector 5 includes a high-sensitivity CO detection unit 51, a determination unit 52, an alarm unit 53, a transmission / reception unit 54, and a control unit 55. Here, the high-sensitivity CO sensing unit 51 is a high-sensitivity CO sensing unit that senses CO in a room with high sensitivity (detects low-concentration CO that cannot be sensed by the CO sensing unit 42 of the fire alarm 4). For example, it has a high sensitivity CO sensor. Further, the determination unit 52 determines whether or not the predetermined physical quantity is equal to or greater than the threshold based on the CO sensing amount (predetermined physical quantity) from the high-sensitivity CO sensing unit 51 and the threshold value stored in the determination unit 52 in advance. For example, having an IC and a program executed on the IC. This threshold value corresponds to the second threshold value in the claims.

  The alarm unit 53 is an alarm unit that issues an alarm based on the determination result of the determination unit 52, and includes, for example, a buzzer and a speaker. In addition, when the determination unit 52 determines that the CO is equal to or greater than the threshold value, the transmission / reception unit 54 transmits a CO detection signal indicating that fact, and receives information from the fire detection device 6 as necessary. For example, the wireless transmission type has an antenna, and the wired type has a connector. The control unit 55 is a control unit that controls each unit of the high-sensitivity CO sensor 5, and includes, for example, an IC and a program executed on the IC.

(Configuration of fire detection device)
In FIG. 10, the fire detection device 6 determines the occurrence of a fire based on information from the combustion device 3, the fire alarm device 4, and the high-sensitivity CO detector 5. An instruction is given and corresponds to the fire detection device in the claims. The fire detection device 6 is provided, for example, in a room where people gather, such as a living room, and includes a determination processing unit 61, an alarm unit 62, a transmission / reception unit 63, and a control unit 64 as shown in FIG. It is configured. Here, the determination processing unit 61 performs a predetermined determination from the operation information from the combustion device 3, the determination result information from the fire alarm device 4, and the determination result information from the high-sensitivity CO sensor 5, and the combustion device 3 These are determination processing means for performing predetermined processing on the fire alarm 4 and the high-sensitivity CO sensor 5, and include, for example, an IC and a program executed on the IC. The determination processing unit 61 corresponds to control means in the claims.

  The alarm unit 62 is an alarm unit that issues an alarm based on an instruction from the control unit 64, and includes, for example, a buzzer and a speaker. In addition, the transmission / reception unit 63 transmits various information to the combustion device 3, the fire alarm 4, and the high-sensitivity CO detector 5, and from the combustion device 3, the fire alarm 4, and the high-sensitivity CO detector 5. A transmission / reception means for receiving various information includes, for example, an antenna in the case of a wireless system and a connector in the case of a wired system. Moreover, the control part 64 is a control means which controls each part of the fire detection apparatus 6, for example, has IC and the program run on this IC. When the control unit 64 receives the smoke detection signal or the CO detection signal and the address number from the fire alarm device 4, the control unit 64 refers to a predetermined address table to transmit the fire alarm device 4 that has transmitted the notification signal. Is identified.

(Fire detection method)
Hereinafter, a method in which the fire detection device 6 detects a fire will be described. The fire detection device 6 shifts to a plurality of detection states (modes) according to the conditions of the combustion device 3, the fire alarm device 4, and the high sensitivity CO sensor 5. In particular, the fire detection device 6 “recognizes the generation of smoke” and “recognizes only the generation of CO” from the determination result information from the fire alarm 4 and the determination result information from the high-sensitivity CO detector 5. In this case, the presence or absence of a fire is promptly determined by shifting the detection state (mode) and changing the alertness level.

  FIG. 12 is a flowchart of the determination process of the fire detection device 6. First, in the initial state, the fire detection device 6 is in a so-called normal mode.

  The fire detection device 6 in the normal mode determines whether or not smoke is detected by the fire alarm 4 provided in each room with the highest priority (step S101). Here, when at least one of the fire alarms 4 provided in each room senses smoke (step S101, Yes. That is, when a smoke detection signal is transmitted from the fire alarm 4), the fire detection device 6 A first process is performed (step S104).

  Next, when one of the fire alarms 4 installed in each room does not detect smoke (No in step S101), but detects CO (step S102, Yes. That is, a CO detection signal from the fire alarm 4). Is transmitted), the fire detection device 6 performs the second process (step S105).

  Alternatively, one of the fire alarms 4 provided in each room does not detect smoke and CO (steps S101 and S102, No), but the high-sensitivity CO detector 5 provided near the vent 23 detects CO. If it is detected (step S103, Yes. That is, if a CO detection signal is transmitted from the high-sensitivity CO detector 5), the fire detection device 6 performs a third process (step S106). Hereinafter, the first process, the second process, and the third process will be described in detail.

(First processing)
First, the first process (step S104) will be described. In this process, since at least one of the fire alarms 4 senses smoke, it can be determined that a fire has occurred regardless of the presence or absence of CO sensing. Therefore, the fire detection device 6 issues a fire alarm, transmits an instruction to issue a fire alarm to the fire alarm devices 4 in all rooms, and receives all instructions received from the fire detection device 6. The fire alarm 4 in the room issues a fire alarm.

(Second processing)
Next, the second process (step S105) in FIG. 12 will be described. FIG. 13 is a flowchart of the determination process of the fire detection device 6 in the second process. At the stage where the second process is started, the fire detection device 6 shifts from the normal mode to the semi-warning mode. This is because if one of the fire alarms 4 installed in each room does not sense smoke but senses CO, there is a possibility that a smoldering fire has occurred and the combustion equipment 3 in the room This is because the possibility of CO being discharged due to the operation is not immediately issued, but the warning level is further increased and the presence or absence of a fire is strictly identified.

  For this reason, the fire detection apparatus 6 receives operation information from the combustion equipment 3 in each room, and confirms whether the combustion equipment 3 is operating (step S201). Here, when the combustion equipment 3 is operating (step S201, Yes), the fire detection device 6 proceeds to step S209 while remaining in the semi-warning mode. On the other hand, when the combustion device 3 is not in operation (step S201, No), the fire detection device 6 determines that there is a high possibility that a smoldering fire has occurred, and shifts from the semi-warning mode to the warning mode. Proceed to step S202.

  First, a case where the sub-warning mode is shifted to the warning mode will be described. In step S202, the fire detection device 6 receives the determination result information from the high sensitivity CO sensor 5 provided in the vicinity of the vent 23, and the high sensitivity CO sensor 5 is stored in the determination unit 52 in advance. Check if CO above threshold A is detected. Here, when the high-sensitivity CO detector 5 detects CO that is equal to or greater than the threshold value A (step S202, Yes), the fire detection device 6 determines that a fire has occurred and issues a fire alarm, and all rooms The fire alarm device 4 is instructed to issue a fire alarm (step S208). And the fire alarm device 4 of all the rooms which received the instruction | indication from the fire detection apparatus 6 raises a fire alarm. On the other hand, when the high-sensitivity CO detector 5 does not detect CO that is greater than or equal to the threshold A (No in step S202), the fire detection device 6 stores the determination unit 43 in the fire alarm device 4 that has detected CO. An instruction is transmitted to lower the smoke detection threshold (step S203). Here, the reason for lowering the smoke detection threshold stored in the determination unit 43 is to determine whether or not a small amount of smoke has been generated in the early stage of the smoldering fire.

  Therefore, in the next step S204, the fire detection device 6 again receives the determination result information from the fire alarm device 4 that has detected CO, and checks whether the fire alarm device 4 has detected smoke. Here, when the fire alarm device 4 senses smoke (step S204, Yes), the fire detection device 6 determines that a fire has occurred, issues a fire alarm, and fire alarm devices 4 in all rooms. An instruction is transmitted to issue a fire alarm (step S208). And the fire alarm device 4 of all the rooms which received the instruction | indication from the fire detection apparatus 6 raises a fire alarm. On the other hand, when the fire alarm 4 does not detect smoke (No at Step S204), the fire detection device 6 waits for a predetermined time T1 (Step S205). Here, the reason why the fire detection device 6 waits for the predetermined time T1 is that the CO detection unit 42 of the fire alarm device 4 performs the CO detection again after a certain period of time in consideration of the possibility of malfunction.

  Therefore, in the next step S206, the fire detection device 6 again receives the determination result information from the fire alarm 4 that senses CO, and checks whether the fire alarm 4 still senses CO. Here, when the fire alarm device 4 still senses CO (step S206, Yes), the fire detection device 6 returns to step S202, and thereafter repeats the process up to step S205. On the other hand, when the fire alarm 4 does not detect CO (step S206, No), the fire detection device 6 determines that no fire has occurred. And the fire detection apparatus 6 transmits the instruction | indication which returns the threshold value of smoke detection memorize | stored in the determination part 43 to the fire alarm device 4 which detected CO (step S207). Thereafter, the fire detection device 6 ends the second process and returns to the normal mode.

  Next, the case where the fire detection device 6 determines that the combustion device 3 is operating in step S201 will be described (step S201, Yes). In this case, the fire detection device 6 transmits an instruction to the high sensitivity CO sensor 5 to change the threshold A stored in the determination unit 52 to the threshold B (threshold A <threshold B) (step S209). Here, the threshold value stored in the determination unit 52 is increased because it is possible to determine that a fire has occurred if a CO amount (threshold value B or more) larger than the CO amount normally discharged by the combustion device 3 is detected. is there. That is, in the present embodiment, conceptually, the threshold A is set such that the amount of CO that can be generated in the natural environment <threshold A ≦ the amount of CO that the combustion device 3 normally discharges, and the threshold B is the combustion device. 3 is set such that the amount of CO normally discharged <threshold B. However, specific values of the threshold A and the threshold B can be arbitrarily set in consideration of the size of the room, the type of the combustion device 3, the CO emission amount, and the like.

  Therefore, in the next step S210, the fire detection device 6 receives the determination result information from the high-sensitivity CO detector 5 again, and confirms whether the high-sensitivity CO detector 5 has detected CO equal to or higher than the threshold value B. . Here, when the high-sensitivity CO detector 5 detects CO equal to or higher than the threshold value B (step S210, Yes), the fire detection device 6 determines that a fire has occurred and issues a fire alarm, and all rooms The fire alarm device 4 is instructed to issue a fire alarm (step S208). And the fire alarm device 4 of all the rooms which received the instruction | indication from the fire detection apparatus 6 raises a fire alarm. On the other hand, if the high-sensitivity CO detector 5 does not detect CO equal to or greater than the threshold value B (step S210, No), the fire detection device 6 determines that no fire has occurred. And the fire detection apparatus 6 transmits the instruction | indication which returns the threshold value B memorize | stored in the determination part 52 to the threshold value A to the high sensitivity CO sensor 5 (step S211). Thereafter, the fire detection device 6 ends the second process and returns to the normal mode.

  As described above, according to the fire detection device according to the third embodiment, even when the fire alarm in the room first senses only CO, the operation status of the combustion equipment in the room and the vicinity of the vent are provided. Furthermore, it is possible to determine the occurrence of a fire by detecting the CO with a high sensitivity CO detector.

  In addition, according to the fire detection device according to the third embodiment, it is possible to quickly determine the occurrence of a fire by lowering the threshold value of the smoke detection determination unit of the fire alarm in the room where CO is detected. Become.

(Third treatment)
Next, the third process (step S106) in FIG. 12 will be described. FIG. 14 is a flowchart of the determination process of the fire detection device 6 in the third process. At the stage where the third process is started, the fire detection device 6 shifts from the normal mode to the alert mode. This is because the fire alarm 4 installed in each room detects neither smoke nor CO, but the high-sensitivity CO sensor 5 provided near the vent 23 detects CO. Even if a fire has occurred, the fire alarm 4 installed in the room may not detect smoke and CO for some reason, such as the door or window of the room where the fire is occurring is open. Because there is.

  First, in step S301, the fire detection device 6 receives operation information from the combustion device 3 in each room, and checks whether the combustion device 3 is operating. Here, when the combustion device 3 is operating (step S301, Yes), the CO detected by the high-sensitivity CO detector 5 is discharged from the combustion device 3 and is not likely to be a fire. Therefore, in order to further confirm the situation, the fire detection device 6 proceeds to step S306 in the alert mode. On the other hand, when the combustion device 3 is not in operation (No in step S301), the CO detected by the high sensitivity CO detector 5 is not likely to be emitted from the combustion device 3 but due to a fire. Therefore, the fire detection device 6 cannot determine the location, but determines that a fire has occurred and issues a fire alarm, and transmits an instruction to issue a fire alarm to the fire alarms 4 in all rooms ( Step S302). And the fire alarm device 4 of all the rooms which received the instruction | indication from the fire detection apparatus 6 raises a fire alarm.

  Further, in the next step S303, the fire detection device 6 transmits an instruction to lower the smoke detection threshold stored in the determination unit 43 to the fire alarms 4 in all rooms. Here, the reason for lowering the smoke detection threshold stored in the determination unit 43 is to identify a room in which a fire has occurred by making it possible to detect a small amount of smoke.

  Therefore, in the next step S304, when the fire alarm 4 in a specific room senses smoke, it is determined that a fire has occurred in that room, and a fire alarm with the information added is issued again. An instruction is sent to the fire alarm 4 in the room to issue a fire alarm with the information added again (step S305). And the fire alarm 4 of all the rooms which received the instruction | indication from the fire detection apparatus 6 raises the fire alarm to that effect.

  In addition, when the fire detection device 6 determines that the combustion device 3 is operating in step S301 (step S301, Yes), the fire detection device 6 is stored in the determination unit 52 in the high sensitivity CO detector 5. An instruction is transmitted to change the threshold value A to threshold value B (threshold value A <threshold value B) (step S306). Here, the threshold value stored in the determination unit 52 is increased because it is possible to determine that a fire has occurred if a CO amount (threshold value B or more) larger than the CO amount normally discharged by the combustion device 3 is detected. is there.

  Therefore, in the next step S307, the fire detection device 6 receives the determination result information from the high-sensitivity CO detector 5 again, and checks whether the high-sensitivity CO detector 5 has detected CO equal to or higher than the threshold value B. . Here, when the high-sensitivity CO detector 5 detects CO equal to or higher than the threshold value B (step S307, Yes), the fire detection device 6 cannot determine the location, but determines that a fire has occurred and issues a fire alarm. At the same time, an instruction is sent to fire alarms 4 in all rooms to issue a fire alarm (step S308). And the fire alarm device 4 of all the rooms which received the instruction | indication from the fire detection apparatus 6 raises a fire alarm.

  In the next step S309, the fire detection device 6 transmits an instruction to lower the smoke detection threshold stored in the determination unit 43 to the fire alarms 4 in all rooms. Here, the reason for lowering the smoke detection threshold stored in the determination unit 43 is to identify a room in which a fire has occurred by making it possible to detect a small amount of smoke.

  Therefore, in the next step S310, if the fire alarm 4 in a specific room detects smoke, it is determined that a fire has occurred in that room, and a fire alarm with the information added is issued again. An instruction is sent to the fire alarm 4 in the room to issue a fire alarm to which the information has been added (step S311). And the fire alarm 4 of all the rooms which received the instruction | indication from the fire detection apparatus 6 raises the fire alarm to that effect.

  In step S307, if the high-sensitivity CO detector 5 does not detect CO equal to or higher than the threshold value B (step S307, No), it is determined that no fire has occurred. And the fire detection apparatus 6 transmits the instruction | indication to return the threshold value B memorize | stored in the determination part 52 to the threshold value A to the high sensitivity CO sensor 5 (step S312). Thereafter, the fire detection device 6 ends the third process and returns to the normal mode.

  As described above, according to the fire detection device according to the third embodiment, even when a high-sensitivity CO detector provided in the vicinity of the vent hole first detects CO, it depends on the operating condition of the combustion equipment in the room. It becomes possible to judge the occurrence of fire.

  Moreover, according to the fire detection apparatus according to the third embodiment, it is possible to further specify the room where the fire has occurred by lowering the threshold value of the smoke detection determination unit of the fire alarm in the room.

[Embodiment 4]
Hereinafter, a fire detection device according to the fourth embodiment will be described in detail with reference to the accompanying drawings. The fire detection device according to the fourth embodiment controls an open / close lid that opens and closes the vent. By this control, air is exhausted only from the selected room, and the high-sensitivity CO sensor monitors only the air exhausted from the selected room. Note that structures and processes that are not particularly described are the same as those in the third embodiment described above, and the same structures and processes will be described with the same reference numerals.

(Configuration of fire detection system)
First, the basic configuration of the fire detection system will be described. FIG. 15 is an indoor layout diagram of a fire detection system provided with a fire detection device according to the fourth embodiment, and FIG. 16 is a system block diagram thereof. Here, a fire detection system 7, a ventilation system 8, and a combustion device 3 are provided in each room of a general household.

  Of these, the fire detection system 7 is for detecting the occurrence of a fire in each room, and generally includes a fire alarm device 4, a high-sensitivity CO detector 5, and a fire detection device 9. Has been. However, details of the fire detection device 9 will be described later.

(Ventilation system configuration)
The ventilation system 8 is a ventilation means for collecting the air in each room at one place and discharging it outside, and instead sucking the outdoor air into each room. The ventilation system 8 includes a vent pipe 21, a vent 22, a vent 23, and an opening / closing lid 86.

  Of these, the open / close lid 86 is a vent opening / closing means for opening / closing the vent 22 based on the control of the fire detection device 9, and corresponds to the open / close lid in the claims. The opening / closing lid 86 is driven by driving means such as a motor, for example, and the driving means is connected to the fire detection device 9 in a communicable manner by wire or wirelessly.

(Configuration of fire detection device)
Next, the detail of the fire detection apparatus 9 of the fire detection system 7 mentioned above is demonstrated. This fire detection device 9 judges the occurrence of a fire based on information from the combustion device 3, the fire alarm 4 and the high sensitivity CO detector 5, and gives instructions to each device according to the situation. This corresponds to the fire detection device in the claims. The fire detection device 9 is provided, for example, in a room where people gather such as a living room, and includes a determination processing unit 91, an alarm unit 62, a transmission / reception unit 63, and a control unit 64 as shown in FIG. It is configured. Here, the determination processing unit 91 makes a predetermined determination from the operation information from the combustion device 3, the determination result information from the fire alarm device 4, and the determination result information from the high-sensitivity CO sensor 5. These are determination processing means for performing predetermined processing on the fire alarm 4 and the high-sensitivity CO sensor 5, and include, for example, an IC and a program executed on the IC. Further, the determination processing unit 91 performs a predetermined determination based on the operation information from the combustion device 3, the smoke detection signal and the CO detection signal from the fire alarm device 4, and the CO detection signal from the high sensitivity CO sensor 5. It is an opening / closing control means for controlling the opening / closing of the opening / closing lid 86. Specifically, the determination processing unit 91 controls a driving unit that drives the opening / closing lid 86 via a wired or wireless connection. Here, the determination processing unit 91 corresponds to the control means in the claims.

(Fire detection method)
Hereinafter, a method in which the fire detection device 9 detects a fire will be described. In the fourth embodiment, the first process, the second process, and the third process are performed as in the process shown in FIG. 12 of the third embodiment. However, since the first process is the same as that of the above-described third embodiment, the description thereof will be omitted, and the second process and the third process will be described only for parts different from the third embodiment.

(Second processing)
First, the second process will be described. FIG. 17 is a flowchart of the determination process of the fire detection device 9 in the second process. This second process is a process performed when only CO is detected by the fire alarm 4. At the stage where the second process is started, the fire detection device 9 shifts from the normal mode to the semi-warning mode. This is because if one of the fire alarms 4 installed in each room does not sense smoke but senses CO, there is a possibility that a smoldering fire has occurred or the combustion equipment 3 in the room is in operation. This is because there is a possibility that CO is discharged. In this semi-warning mode, the fire detection device 9 first controls the opening / closing of each open / close lid 86, thereby closing the vents 22 in the rooms other than the room in which the CO is detected by the fire alarm 4 (see FIG. Step S401). For example, when only CO is detected in a bedroom, the fire detection device 9 controls the opening / closing of each open / close lid 86, and as a result, the vents 22 in the rooms other than the bedroom are closed. Thereby, only the air in the room where CO is detected is taken in from the vent 22 and exhausted from the vent 23. Therefore, the high-sensitivity CO detector 5 provided in the vent 23 monitors only the air exhausted from the room where CO is detected.

  Next, in step S402, the fire detection device 9 receives operation information from the combustion device 3 in each room, and checks whether the combustion device 3 is operating. Here, when the combustion device 3 is not in operation (No in step S402), the fire detection device 9 determines that there is a high possibility that a smoldering fire has occurred, and shifts from the semi-warning mode to the warning mode. Steps S409 to S409 are executed. Here, step S403 to step S409 are the same as step S202 to step S208 of FIG. 13 in the third embodiment.

  On the other hand, when the combustion device 3 is operating (step S402, Yes), the fire detection device 9 proceeds to step S410 while remaining in the semi-warning mode, and waits for a predetermined time T2 (step S410). Here, the reason for waiting for the predetermined time T2 is that it takes a certain time for the air taken in from the vent 22 provided in the room where CO is detected to be discharged from the vent 23. And after predetermined time T2, progress, the fire detection apparatus 9 confirms whether the combustion apparatus 3 is working in the room where the fire alarm 4 sensed CO (step S411). When the combustion device 3 is not operating (step S411, No), the fire detection device 9 determines that there is a high possibility that a fire has occurred, and shifts from the semi-warning mode to the warning mode. S417 is executed. Here, steps S412 to S417 are the same as steps S202 to S207 of FIG. 13 in the third embodiment.

  On the other hand, when the combustion device 3 is operating (step S411, Yes), the fire detection device 9 executes steps S418 to S420 while in the semi-warning mode. Here, step S418 to step S420 are the same as step S209 to step S211 of FIG. 13 in the third embodiment. The above is the description of the second processing by the fire detection device 9.

  As described above, according to the fire detection device according to the fourth embodiment, only the air in the room where CO is detected is exhausted from the vent hole by the control of the opening / closing lid. Therefore, the influence of CO generated outside the room where CO is detected is eliminated from the air monitored by the high-sensitivity CO sensor, and it is possible to more accurately determine whether a fire has occurred.

(Third treatment)
Next, the third process will be described. FIG. 18 is a flowchart of the determination process of the fire detection device 9 in the third process. This third process is a process that is performed when neither CO nor smoke is detected by the fire alarm 4. At the stage where the third process is started, the fire detection device 9 shifts from the normal mode to the semi-warning mode. This is because the fire alarm 4 installed in each room detects neither smoke nor CO, but the high-sensitivity CO sensor 5 provided near the vent 23 detects CO. Even if a fire has occurred, there is a possibility that the fire alarm 4 installed in the room does not detect smoke and CO for some reason, such as the door or window of the room where the fire is occurring is open. Because there is.

  First, the fire detection device 9 confirms whether or not the combustion device 3 is operating (step S501). If the combustion device 3 is not operating (No in step S501), the fire detection device 9 starts from step S502. Step S505 is executed. Here, step S502 to step S505 are the same as step S302 to step S305 of FIG. 14 in the third embodiment.

  On the other hand, when the combustion device 3 is operating (step S501, Yes), the fire detection device 9 controls the opening / closing of the opening / closing lid 86, and the vent 22 in the room where the combustion device 3 is operating is closed. (Step S506). Then, the fire detection device 9 waits for a predetermined time T2 (step S507). Here, the reason why the fire detection device 9 waits for a predetermined time after the control of the open / close lid 86 is that it takes a certain time until the air taken in from the vent 22 is discharged from the vent 23. . Then, after the predetermined time T2 has elapsed, steps S508 to S514 are executed. Here, step S508 to step S514 are the same as step S306 to step S312 of FIG. 14 in the third embodiment.

  Thus, according to the fire detection apparatus according to the fourth embodiment, the air in the room where the combustion device is operating is not exhausted from the vent hole by the control of the opening / closing lid. Therefore, the influence of the combustion equipment is eliminated from the air monitored by the high-sensitivity CO sensor, and the presence or absence of a fire can be determined more accurately.

[Embodiment 5]
Next, a specific method for increasing the sensitivity of smoke detection in the determination unit of the fire alarm device in each room in the fire detection device according to the third embodiment described above will be described below.

  The configuration of the fire detection apparatus according to the fifth embodiment is substantially the same as that of the third embodiment described above, and the same configuration will be described with the same reference numerals. The fire detection system 1 includes a fire alarm device 4, a high-sensitivity CO sensor 5, and a fire detection device 6. Moreover, the fire alarm 4 is provided in each room in order to constantly monitor the state of smoke and CO in the room. The fire alarm 4 includes a smoke detection unit 41, a CO detection unit 42, a determination unit 43, an alarm unit 44, a transmission / reception unit 45, and a control unit 46.

(Configuration of smoke detector)
FIG. 19 is a block diagram showing the configuration of the smoke detection unit 41. The smoke detection unit 41 includes a light emitting LED 41a, a light receiving LED 41b, a light emission driving unit 41c, an amplification unit 41d, an LED control unit 41e, and a signal processing unit 41f. Here, the light emitting LED 41a emits light, and the light is irregularly reflected by smoke flowing into a smoke chamber (not shown), and the light receiving LED 41b receives the reflected light. The light emission driver 41c applies a voltage so that the light emitting LED 41a emits light, and the amplifier 41d converts the light received by the light receiving LED 41b into an output signal and amplifies it. The LED control unit 41e controls the light emitting LED 41a, the light receiving LED 41b, the light emission driving unit 41c, and the amplifying unit 41d. The signal processing unit 41f applies various processes to the signal sent from the amplification unit 41d, and has a sensitivity compensation unit 41g in the circuit.

(Sensitivity compensator)
Here, the sensitivity compensation unit 41g is a circuit that converts the value of the output signal amplified by the amplification unit 41d in accordance with a predetermined condition. The sensitivity compensation unit 41g is obtained by the determination processing unit 61 of the fire detection device 6. The function is controlled so as to be enabled or disabled. Hereinafter, the sensitivity compensation unit 41g will be described in detail. FIG. 20 is a diagram illustrating a change with time of the output signal received by the determination unit 43 from the signal processing unit 41f. Normally, when the output signal sent from the signal processing unit 41f to the determination unit 43 exceeds the smoke detection threshold of the determination unit 43 (in the case of the output signal 1), the determination unit 43 determines that smoke has been detected.

  However, when the light receiving LED 41b receives the light emitted from the light emitting LED 41a, the reflected light diffusely reflected by the dust accumulated in the chamber may be received instead of the smoke flowing into the chamber. In this case, since the light reception level of the light receiving LED 41b varies and the output signal received by the signal processing unit 41f from the amplification unit 41d also varies, as a countermeasure, the sensitivity compensation unit 41g corrects the output signal and uses the variation. Remove. For example, when the output signal received by the signal processing unit 41f from the amplification unit 41d increases little by little like the output signal 2 in FIG. 20, the sensitivity compensation unit 41g subtracts the increase and outputs the output signal 2 as the output signal. After being corrected to 2 ′, it is transmitted to the determination unit 43.

  However, such sensitivity compensation may have an adverse effect in a firewood fire environment. That is, as described above, smoke is hardly generated in the early stage of fire, and the amount of smoke generated increases rapidly after a certain amount of time has passed. In this way, when smoke gradually increases in the early stage of the fire, it is judged that this is an increase in the amount of light received due to dust accumulation, and if sensitivity compensation has been performed, smoke cannot be detected accurately. It becomes difficult for the fire alarm 4 to detect the fire.

  In order to solve this problem, in the fifth embodiment, when a predetermined condition is satisfied, the sensitivity compensation unit 41g of the fire alarm 4 is invalidated, and the sensitivity of smoke detection in the determination unit 43 of the fire alarm 4 is increased. By raising it, it is possible to quickly and reliably determine the occurrence of fire, especially firewood fire. A specific processing method will be described below.

(Fire detection method)
In the fifth embodiment, the first process, the second process, and the third process are performed as in the process shown in FIG. 12 of the third embodiment. Here, in particular, the case of the second process will be described as a representative. In the second process, only parts different from the third embodiment will be described.

(Second processing)
FIG. 21 is a flowchart of the determination process of the fire detection device 6 in the second process of the fifth embodiment. At the stage where the second process is started, the fire detection device 6 shifts from the normal mode to the semi-warning mode. Here, step S601 to step S603 are the same as step S201 to step S203 of FIG. 13 in the third embodiment.

  In the next step S604, the fire detection device 6 transmits an instruction to invalidate the sensitivity compensation unit 41g in the signal processing unit 41f of the smoke detection unit 41 to the fire alarm device 4 that has detected CO. In this way, by disabling the sensitivity compensation unit 41g, the amount of smoke transmitted to the determination unit 43 becomes the amount actually detected by the smoke detection unit 41, so the smoke stored in the determination unit 43 The difference from the detection threshold is reduced, and the same effect as lowering the smoke detection threshold stored in the determination unit 43 is obtained, and the sensitivity of smoke detection in the determination unit can be increased.

  The next steps S605 to S608 are the same as steps S204 to S207 of FIG. 13 in the third embodiment, and the description thereof will be omitted below.

  In the next step S609, since it can be determined that no fire has occurred, the fire detection device 6 causes the fire alarm device 4 that has detected CO to be in the signal processing unit 41f of the smoke detection unit 41 in order to return to the initial state. An instruction is transmitted to enable the sensitivity compensation unit 41g.

  Subsequent steps S610 to S613 are the same as steps S208 to S211 of FIG. 13 in the third embodiment, and description thereof will be omitted below.

  As described above, according to the fire detection device of the fifth embodiment, the smoke detection in the fire alarm determination unit is further disabled by disabling the smoke sensitivity compensation unit of the fire alarm in the room where CO is detected. This makes it possible to quickly detect the occurrence of a fire such as a fire that burns CO in the early stage of fire but does not generate much smoke.

[Modifications to Embodiment]
Although the embodiments of the present invention have been described above, the specific configuration and means of the present invention may be arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. Can do. Hereinafter, such a modification will be described.

(Regarding the field of application of the present invention)
The application target of the present invention is not limited to the general household as described above, and can be applied to any building such as a building or a warehouse where the combustion equipment is used indoors.

(About problems to be solved and effects of the invention)
The problems to be solved by the invention and the effects of the invention are not limited to the above-described contents, and the present invention solves the problems not described above or produces the effects not described above. In addition, only a part of the described problems may be solved or only a part of the described effects may be achieved. For example, as long as the fire detection device is not connected to all combustion devices and cannot receive combustion information from some combustion devices, it can judge from the combustion information of other combustion devices and enter the warning mode. The object of the present invention has been achieved.

(About control)
In addition, the control unit shown in each embodiment and each processing block in the control unit can actually be configured as a CPU and a computer program that is read and executed by the CPU, or in hard-wired logic. Can be configured. Further, each of the electrical components described above is functionally conceptual and does not necessarily need to be physically configured as illustrated. In other words, the specific form of distribution / integration of each unit is not limited to the one shown in the figure, and all or a part thereof may be functionally or physically distributed / integrated in arbitrary units according to various loads or usage conditions. Can be configured. In addition, the processing procedure or the control procedure shown in the document or the drawing can be arbitrarily changed unless otherwise specified.

(Change rate of sensing amount)
In the first embodiment, the fire determination is performed based on the change rate of the CO detection amount, but the determination may be performed based on the change rate of the smoke detection amount. Also, the rate of change is not referred to only when the detected amount of CO or smoke does not exceed the threshold, but when the detected amount of CO or smoke exceeds the threshold, the rate of change further exceeds the predetermined threshold. The alarm accuracy may be improved by performing an alarm only when the alarm is present.

(Detection in multiple layers)
In the second embodiment, the fire alarm on the first floor refers to the detection result of the fire alarm on the second floor, but is not limited to the first or second floor, and is detected between any upper and lower floors. The results can be cross-referenced. In addition, when there is an increase in smoke other than CO, the smoke detection results on other floors may be referred to. In addition, the detection results of other floors are not referred to only when the detected amount of CO or smoke does not exceed the threshold value, but when the detected amount of CO or smoke exceeds the threshold value, further floors The alarm accuracy may be improved by performing an alarm only when CO or smoke is detected.

(Fire detection system)
The fire detection system may include other high sensitivity sensors instead of the high sensitivity CO sensors. For example, a high-sensitivity smoke detector that senses smoke with high sensitivity may be provided. Alternatively, if the sensitivity of the CO sensor installed in the ventilation system is not a problem, a normal sensitivity CO sensor may be used instead of the high sensitivity CO sensor. Alternatively, the ventilation system may be provided with a smoke sensor instead of the CO sensor. Moreover, you may use the sensor which detects a fire with heat instead of smoke and CO.

(vent)
The vent may not be connected to the outdoors. For example, indoor dirty air may be collected in one place and purified, and then returned to the indoor again. In this case, the high-sensitivity CO sensor is more preferably provided in the vicinity of a place where dirty air gathers indoors. Moreover, the vent hole may be provided not only in one place but in several places. In this case, the high-sensitivity CO sensor only needs to be provided in the vicinity of all the vents.

(Fire detection device)
The fire alarm and the high-sensitivity CO sensor may not have the function of the determination unit, and instead, the fire detection device may have the function of the determination unit. In this case, the fire detection device receives the predetermined physical quantity monitored by the fire alarm and the high-sensitivity CO detector as it is, and based on the threshold value stored in advance in the determination unit, whether or not the predetermined physical quantity is equal to or greater than the threshold value. It may be determined.

  In addition, when the determination processing unit of the fire detection device determines that the combustion device is operating, it may have a function of stopping the operation of the combustion device. In this case, the determination processing unit may receive the determination result information from the fire alarm device and the determination result information from the high-sensitivity CO sensor again after the operation of the combustion device is stopped, and perform predetermined determination and processing.

(About control of the lid)
In the fourth embodiment, the determination processing unit 91 controls the opening / closing of the open / close lid 86 based on the monitoring result of the fire alarm device 4 and the operation information from the combustion device 3. The unit 91 may control the opening / closing of the opening / closing lid 86 based on the monitoring result of the high-sensitivity CO sensor 5.

  The present invention can be applied to a fire detection device that detects an initial fire, in particular, a smoldering fire, and is useful for increasing the detection accuracy of a fire alarm or a fire detection device.

It is the conceptual diagram which showed transition of the generation amount of smoke and CO in the case of a firewood fire. It is an indoor arrangement | positioning figure of the fire alarm which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of a fire alarm functionally. It is a flowchart of the judgment process of a fire alarm. It is the conceptual diagram which showed transition of the generation amount of smoke and CO in the case of a firewood fire. It is an indoor arrangement | positioning figure of the fire alarm which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure of a fire alarm functionally. It is a flowchart of the judgment process of a fire alarm. It is the conceptual diagram which showed transition of the generation amount of smoke and CO in the case of a firewood fire. It is an indoor arrangement | positioning figure of the fire detection system provided with the fire detection apparatus which concerns on Embodiment 3 of this invention. It is a block diagram of the fire detection system provided with the fire detection apparatus which concerns on Embodiment 3. FIG. It is a flowchart of the judgment process of a fire detection apparatus. 10 is a flowchart of a determination process of a fire detection device in the second process of the third embodiment. 10 is a flowchart of a determination process of a fire detection device in the third process of the third embodiment. It is an indoor arrangement | positioning figure of the fire detection system provided with the fire detection apparatus which concerns on Embodiment 4 of this invention. It is a block diagram of the fire detection system provided with the fire detection apparatus which concerns on Embodiment 4. 10 is a flowchart of a fire detection apparatus determination process in the second process of the fourth embodiment. 10 is a flowchart of a fire detection device determination process in the third process of the fourth embodiment. It is the block diagram which showed the structure of the smoke detection part which concerns on Embodiment 5 of this invention. It is the figure which showed the time-dependent change of the output signal which a determination part receives from a signal processing part. 12 is a flowchart of a fire detection apparatus determination process in the second process of the fifth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fire detection system 2 Ventilation system 4, 10, 17 Fire alarm 11, 41 Smoke detection part 12, 42 CO detection part 13, 43, 52 Judgment part 14, 44, 53, 62 Alarm part 15, 32, 45, 54 , 63 Transmitter / receiver 16, 18, 33, 46, 55, 64 Control unit 21 Ventilation tube 22 Vent 23 Air vent 24 Exhaust fan 25 Exhaust fan 3 Combustion equipment 31 Combustion unit 41a Light emitting LED
41b LED
41c Light emission drive part 41d Amplification part 41
41e LED control unit 41f Signal processing unit 41g Sensitivity compensation circuit 5 High sensitivity CO detector 51 High sensitivity CO detection unit 6 Fire detection device 61 Determination processing unit 7 Fire detection system 8 Ventilation system 86 Opening and closing lid 9 Fire detection device 91 Determination processing unit

Claims (10)

A fire alarm that monitors a fire based on a state of a predetermined physical quantity within a predetermined monitoring area,
First detection means for detecting a predetermined first physical quantity;
Second detection means for detecting a predetermined second physical quantity;
When the rate of change of the first physical quantity detected by the first detection unit or the rate of change of the second physical quantity detected by the second detection unit exceeds a predetermined threshold value Control means for determining that a fire has occurred;
A fire alarm characterized by comprising. In order to monitor a fire based on a state of a predetermined physical quantity in a predetermined monitoring area in a multi-level, a fire alarm installed in each of two or more levels in the multi-level,
Detection means for detecting a predetermined physical quantity in the hierarchy where the fire alarm is disposed;
When the physical quantity is detected by the detection means, a fire has occurred when the physical quantity is also detected in another fire alarm installed at a level other than the level where the fire alarm is installed. A control means for judging that
A fire alarm characterized by comprising. A fire detection device communicably connected to a first sensor for monitoring a state of a predetermined physical quantity in a predetermined monitoring area and a combustion device installed in the predetermined monitoring area,
The monitoring result of the first sensor and the operation information for confirming the operating state of the combustion device are received, and based on the monitoring result and the operation information, a predetermined condition regarding the presence or absence of fire in the predetermined monitoring area is received. Provided with control means for controlling
A fire detection device. The fire detection device is installed in a ventilation path communicating with each of the plurality of monitoring areas, and is connected to be communicable with a second sensor that monitors the state of the predetermined physical quantity,
The control means receives a monitoring result of the second sensor, and performs a predetermined control on the presence or absence of a fire in the predetermined monitoring area based on the monitoring result of the second sensor;
The fire detection device according to claim 3. When the control means confirms that the predetermined physical quantity is equal to or greater than a first threshold based on the monitoring result of the first sensor, the control means confirms the operating state of the combustion device based on the operation information. thing,
The fire detection device according to claim 3 or 4, characterized by the above. The control means, when it is confirmed that the combustion equipment is not in operation, determining that a fire has occurred in the predetermined monitoring area;
The fire detection device according to claim 5. The control means confirms that the combustion device is not in operation, and confirms that the predetermined physical quantity is equal to or greater than a second threshold based on a monitoring result of the second sensor. Determining that a fire has occurred within the surveillance area of
The fire detection device according to claim 5. The control means controls a change of a predetermined threshold for the monitoring result based on the operation information for confirming an operation state of the combustion device;
The fire detection device according to any one of claims 3 to 7, characterized in that: The fire detection device is communicably connected to an open / close lid that allows the monitoring area and the ventilation path to communicate with each other.
The control means controls the opening / closing of the open / close lid based on the monitoring result of the first sensor, the monitoring result of the second sensor, or the operation information;
The fire detection device according to any one of claims 4 to 8, characterized by: The first sensor comprises smoke detecting means for detecting the presence or absence of smoke generation in a monitoring area, and compensation means for compensating so as to reduce the amount of smoke detected by the smoke detecting means under a predetermined condition,
Control means for disabling the compensation means when CO generation in the monitoring area is detected by a predetermined means and the smoke detection means does not detect smoke generation;
The fire detection device according to any one of claims 3 to 9, wherein:

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