JP2010044478A - Indoor abnormality monitoring alarm system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an indoor abnormality monitoring system for early performing a fire alarm even if a fire is a fire wherein it takes a time for a smoke density to begin to increase after ignition in a smoldering fashion. <P>SOLUTION: A controller 11 distinguishes whether a gas appliance 8 is used or not from a gas flow rate supplied to the gas appliance 8 detected by a gas meter 6. The controller 11 performs the fire alarm when a CO density detected by a CO sensor 9 increases successively for a prescribed time or above while distinguishing that the gas appliance 8 is not used. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an indoor abnormality monitoring alarm system.

  Conventionally, there is a fire alarm system as the above-described indoor abnormality monitoring alarm system. As this fire alarm system, for example, a system that performs a fire alarm when the smoke concentration detected by a smoke sensor exceeds a threshold value is known. However, with a fire alarm system using a smoke sensor, it is impossible to give an early warning of a fire if a fire occurs that takes time until the smoke concentration starts to increase after ignition like futon smoldering with sleeping cigarettes There was a problem.

  Therefore, the present invention pays attention to the above-mentioned problems, and even if it is a fire that takes time until ignition starts increasing after igniting like smoldering, a fire alarm can be given early. It is an object to provide an indoor abnormality monitoring alarm system.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the flow rate detecting means for detecting the flow rate of gas supplied to a gas appliance arranged indoors, and the gas flow rate detected by the flow rate detecting means It is determined that the gas appliance is not used by a usage determination unit that determines whether or not a gas appliance is used, a carbon monoxide concentration sensor that detects a carbon monoxide concentration in the room, and the usage determination unit. In addition, the present invention resides in an indoor abnormality monitoring / warning system comprising an abnormality alarm means for alarming an indoor abnormality when the carbon monoxide concentration detected by the carbon monoxide sensor increases.

  The invention according to claim 2 further comprises alarm prohibiting means for prohibiting an abnormal alarm by the abnormal alarm means when the increase in the carbon monoxide concentration does not continue for a predetermined time or more. It exists in the indoor abnormality monitoring alarm system.

  According to a third aspect of the present invention, the carbon monoxide concentration detected by the carbon monoxide sensor while the abnormality warning means determines that the gas appliance is not used by the use determining means is a predetermined time. The indoor abnormality monitoring / warning system according to claim 1 or 2, wherein an alarm is given for an abnormality in the room when the increase continues.

  As described above, according to the first aspect of the present invention, the carbon monoxide concentration increases faster than the smoke concentration in the case of a fire that takes a long time until the smoke concentration starts increasing after ignition like smoldering. Paying attention to the start, if the concentration of carbon monoxide detected by the carbon monoxide sensor increases while it is determined that the gas appliance is not being used by the use determining means, the indoor abnormality alarm means warns. Thereby, even if it is a fire that takes a long time from when it is ignited like smoldering until the smoke concentration starts to increase, an indoor abnormality alarm can be given early. In addition, while the gas appliance is being used, the alarm for indoor abnormalities will not occur even if the carbon monoxide concentration increases, so it is possible to prevent the false alarm of an increase in the carbon monoxide concentration due to the use of the gas appliance. be able to. In addition, even if normal gas appliances are used, the carbon monoxide concentration is low due to the initial combustion of gas appliances or large amounts of water boiling in a gas stove, etc. However, it is difficult to set a low concentration (30 to 70 ppm) of carbon monoxide concentration in the invention of the first aspect.

  According to the second aspect of the present invention, since the alarm prohibition means prohibits the fire alarm by the indoor abnormality alarm means while the increase of the carbon monoxide concentration does not continue for a predetermined time or more, the intrusion of the exhaust gas from the cigarette or the outdoors It is possible to prevent a temporary increase in carbon monoxide due to the occurrence of a false alarm as a room abnormality.

  According to the third aspect of the present invention, attention is paid to the fact that the carbon monoxide concentration starts to increase earlier than the smoke concentration in the case of a fire that takes a long time until the smoke concentration starts increasing after ignition like smoldering. When the carbon monoxide concentration detected by the carbon monoxide sensor continues to increase for a predetermined time or more while it is determined that the gas appliance is not being used by the use determining unit, the fire alarm unit warns of a fire. . Thereby, even if it is a fire that takes a long time from when it is ignited like smoldering until the smoke concentration starts to increase, an indoor abnormality alarm can be given early. In addition, while a gas appliance is in use, even if the carbon monoxide concentration increases, an indoor abnormality alarm is not issued, so it is possible to prevent false alarms of an increase in carbon monoxide concentration due to the use of gas appliances as an indoor abnormality. can do. Furthermore, since an abnormal alarm is not issued even if the increase in carbon monoxide concentration does not continue for a predetermined time or longer, it is possible to prevent a false increase in the carbon monoxide caused by tobacco or exhaust gas from being falsely alarmed as an abnormal indoor condition. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a gas supply facility incorporating a fire alarm device as an indoor abnormality monitoring alarm system includes gas containers 1a and 1b, high-pressure hoses 2a and 2b, a pressure regulator 3, a closing cock 4, A gas pipe 5, a gas meter 6 as a flow rate detection means, a branch gas pipe 7, a gas appliance 8, a carbon monoxide (hereinafter abbreviated as CO) sensor 9, a smoke sensor 10, a control device 11, It has.

  High-pressure gas from the two gas containers 1a and 1b is supplied to the pressure regulator 3 via the high-pressure hoses 2a and 2b. The pressure regulator 3 adjusts the high-pressure gas from the gas containers 1a and 1b to a gas having a predetermined pressure.

  The pressure-adjusted gas is supplied to the gas meter 6 through the gas pipe 5 having the closing cock 4 in the middle, and then further through the gas pipe 5 and the branch gas pipe 7 branched from the gas pipe 5. And is supplied to the gas appliance 8 disposed in the room. Examples of the gas appliance 8 include a water heater 8a, a gas stove 8b, a gas heater 8c, and a gas floor heater 8d.

  The gas meter 6 includes a flow rate sensor, a control circuit, and an integration display unit (all not shown). The flow rate sensor is an ultrasonic type or thermal type sensor that detects the flow rate of gas flowing through the gas pipeline 5 (that is, the total flow rate of gas supplied to the gas appliance 8). The control circuit is composed of, for example, a microcomputer (hereinafter abbreviated as μCOM), controls the flow rate sensor, integrates the gas flow rate flowing through the gas pipeline 5, and displays it on the integrated display unit. The gas meter 6 is connected to a control device 11 to be described later, and outputs the gas flow rate flowing through the gas pipe line 5 detected by the flow rate sensor to the control device 11.

  The CO sensor 9 is a sensor of a contact combustion type or the like that is disposed indoors and detects the indoor CO concentration. The CO sensor 9 is connected to a control device 11 described later, and outputs the detected CO concentration to the control device 11. The smoke sensor 10 is an optical sensor or the like that detects indoor smoke density. The smoke sensor 10 is connected to a control device 11 described later, and outputs the detected smoke density to the control device 11. The control device 11 is composed of, for example, μCOM, and detects a fire based on the gas flow rate from the gas meter 6, the CO concentration from the CO sensor 9, and the smoke concentration from the smoke sensor 10, and issues a fire alarm. It is a device to perform.

  Before describing the operation of the above-described fire alarm system, the principle of the fire alarm system of the present invention will be described below with reference to FIGS. FIG. 2 shows a time chart of indoor smoke concentration and CO concentration when a fire that generates a lot of smoke by burning a cotton wick is generated. As shown in the figure, in the case of a fire that emits a lot of smoke, the smoke concentration increases rapidly around 2 minutes after the fire. On the other hand, the CO concentration gradually increases from about 2 minutes after the occurrence of the fire. Therefore, in the case of a fire with a lot of smoke, a fire alarm can be given early by detecting an increase in smoke concentration.

  FIG. 3 shows a time chart of indoor smoke concentration and CO concentration when a smoldering fire is generated. As shown in the figure, in the case of a fire that takes a long time from the start of a fire, such as a smoldering fire, until the smoke concentration starts to increase, the smoke concentration is little even after 45 minutes have passed since the fire occurred. It does not increase, but gradually increases from around 45 minutes. On the other hand, the CO concentration starts to gradually increase around 10 minutes after the occurrence of the fire. The CO concentration begins to increase faster than the smoke concentration. Therefore, in the case of a fire that takes time until the smoke concentration begins to increase, such as a smoldering fire, it is possible to fire early by detecting the CO concentration. Further, by determining that the gas appliance 8 is not used as in the present invention, it is possible to set a very low concentration without considering the CO generated from the current gas appliance 8, and to notify the fire as an abnormal interior at an early stage. be able to.

  FIG. 4 is a time chart showing the CO concentration when a smoldering fire is generated, and the CO concentration when the CO concentration is temporarily increased due to tobacco or exhaust gas. As shown in the figure, when a smoldering fire occurs, the CO concentration continuously increases from about 10 minutes after the fire occurs. On the other hand, when the CO concentration temporarily increases due to cigarettes or exhaust gas, the increase in CO concentration does not continue but immediately decreases. Therefore, if the fire alarm is not performed while the increase in CO concentration does not continue for a predetermined time or longer, a temporary increase in carbon monoxide caused by tobacco or exhaust gas from a car that has flown in from the outside is falsely alarmed as a fire. Can be prevented.

  Next, the operation of the above-described fire alarm system will be described below with reference to the flowchart of FIG. First, the control device 11 starts processing in response to power-on, and performs initialization processing for resetting the elapsed time T, the current CO concentration Xn, and the previous CO concentration Xp, which will be described later, to 0 (step S1). Next, the control apparatus 11 takes in the smoke density | concentration from the smoke sensor 10 (step S2). As a result, if the smoke concentration is equal to or higher than a predetermined smoke threshold (Y in step S3), the control device 11 determines that a fire has occurred and performs a fire alarm process (step S12). End the process. In the fire alarm process, the control device 11 outputs a fire alarm from, for example, a speaker or notifies the management center 12 of a fire via a telephone line.

  On the other hand, if the smoke density does not exceed the smoke threshold value (N in step S3), the control device 11 takes in the gas flow rate from the gas meter 6 (step S4). Next, the control device 11 functions as a use determination unit, and performs a use determination process for determining whether or not the gas appliance 8 disposed in the room is being used from the taken gas flow rate (step S5). Specifically, the control device 11 determines that any gas appliance 8 is not in use if the gas flow rate taken in is smaller than a predetermined flow rate threshold value and can be regarded as almost zero, and the gas taken in is determined. If the flow rate is larger than the steam flow rate threshold value, it is determined that any of the gas appliances 8 is being used.

  If the control device 11 determines that any of the gas appliances 8 is used as a result of the use determination processing (N in step S6), the control device 11 returns to step S2. In contrast, if the control device 11 determines that none of the gas appliances 8 are used as a result of the use determination processing (Y in step S6), the control device 11 stores the current CO concentration Xn as the previous CO concentration Xp. (Step S7). Thereafter, the control device 11 takes in the CO concentration from the CO sensor 9 and stores it as the current CO concentration Xn (step S8). Next, the control device 11 compares the current CO concentration Xn with the previous CO concentration Xp to determine whether or not the CO concentration has increased (step S9).

  If the CO concentration has increased (Y in step S9), the controller 11 increments the elapsed time T (step S10), and then determines whether or not the elapsed time T has exceeded a predetermined time (step S11). . If the elapsed time T exceeds the predetermined time (Y in step S11), the control device 11 functions as a fire alarm means, and it is determined that a fire has occurred because the increase in CO concentration has continued for a predetermined time or more. After performing the alarm process (step S12), the process ends. On the other hand, if the elapsed time T does not exceed the predetermined time (N in step S11), the control device 11 returns to step S2. On the other hand, if the CO concentration has not increased (N in step S9), the control device 11 functions as an alarm prohibiting unit and resets the elapsed time T to 0 so that a fire alarm is not performed (step S13). Return to S2.

  According to the fire alarm system described above, in the case of a fire that takes time from igniting like smoldering until the smoke concentration starts to increase, paying attention to the fact that the CO concentration starts to increase earlier than the smoke concentration, The control device 11 issues a fire alarm when the CO concentration detected by the CO sensor 9 increases while determining that the gas appliance 8 is not being used. Thereby, even if it is a fire that takes time until the smoke concentration starts to rise after ignition like smoldering, a fire alarm can be given early. Further, since the fire alarm is not performed even if the CO concentration increases while the gas appliance 8 is being used, it is possible to prevent the increase in the CO concentration due to the use of the gas appliance 8 from being falsely alarmed as a fire. . In addition, even if normal gas appliances are used, carbon monoxide concentration is low due to the initial stage of combustion of gas appliances and large amounts of hot water in a gas stove, etc. Although detection at 30 to 70 ppm was difficult, it is possible in this embodiment.

  Further, since the control device 11 does not issue a fire alarm while the increase in CO concentration does not continue for a predetermined time or longer, a temporary increase in CO concentration due to tobacco or exhaust gas from a car that has flown in from the outside is falsely alarmed as a fire. Can be prevented.

  According to the above-described embodiment, a fire is warned when the CO concentration detected by the CO sensor increases while it is determined that the gas appliance is not used, but the present invention is limited to this. It is not a thing. For example, the present invention only needs to warn a room abnormality when the CO concentration detected by the CO sensor 9 increases while it is determined that the gas appliance is not used.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

It is a figure which shows one Embodiment of the gas supply equipment incorporating the fire alarm system as an indoor abnormality monitoring alarm system of this invention. The time chart of the indoor smoke density | concentration and CO density | concentration at the time of generating the fire which burns a cotton lantern and generates many smokes is shown. It is a time chart of the indoor smoke density | concentration and CO density | concentration at the time of generating a smoldering fire. It is a time chart which shows the CO density | concentration in the case of increasing CO concentration temporarily resulting from a cigarette and exhaust gas when a smoldering fire is generated. It is a flowchart which shows the process sequence of the control apparatus shown in FIG.

Explanation of symbols

6 Gas meter (flow rate detection means)
8 Gas appliances 9 Carbon monoxide sensor 11 Control device (use discrimination means, fire alarm means, alarm prohibition means)

Claims (3)

A flow rate detecting means for detecting a flow rate of gas supplied to a gas appliance arranged in the room;
Use discriminating means for discriminating whether or not the gas appliance is being used from the gas flow rate detected by the flow rate detecting means;
A carbon monoxide concentration sensor for detecting the carbon monoxide concentration in the room;
An abnormality alarm means for alarming an abnormality in the room when the carbon monoxide concentration detected by the carbon monoxide sensor increases while the gas appliance is determined not to be used by the use determination means;
An indoor abnormality monitoring and alarm system characterized by comprising: The indoor abnormality monitoring alarm system according to claim 1, further comprising alarm prohibiting means for prohibiting an abnormality alarm by the abnormality alarm means when the increase in the carbon monoxide concentration does not continue for a predetermined time or more. When the carbon monoxide concentration detected by the carbon monoxide sensor continues to increase for a predetermined time or more while the abnormality warning means determines that the gas appliance is not used by the use determination means, The indoor abnormality monitoring / warning system according to claim 1 or 2, wherein an abnormality is alarmed.

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