JP2010079539A - Home fire alarm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a home fire alarm which outputs an alarm message according to a level of a fire. <P>SOLUTION: The home fire alarm includes: an alarm message storage part 14 in which a plurality of alarm messages are registered in advance; first and second detection parts 11, 12 having different fire detection conditions; and a control part 19 that selects and outputs, when the first detection part 11 detects a fire, a first alarm message registered in the alarm message storage part 14, and when the second detection part 12 detects the fire, selects and outputs a second alarm message registered in the alarm message storage part 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a residential fire alarm that outputs an alarm message when smoke or heat of a fire is detected.

As described in the following non-patent literature, when a fire alarm for homes that has been widely marketed recently has detected a fire (heat or smoke), its detection signal exceeds a preset threshold value inside the detector. For example, an alarm message such as “Peep, Peep, Fire. Fire is” is output.
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  However, since the fire alarm as described above has only one of a heat sensor for detecting heat and a smoke sensor for detecting smoke, it may be a serious fire that requires evacuation or an initial fire extinguishing level. There was a problem that it was impossible to judge whether it was a fire. Then, this invention makes it a subject to provide the fire alarm for houses which outputs the alarm message according to the level of fire.

  The residential fire alarm device according to the present invention includes an alarm message storage unit in which a plurality of alarm messages are registered in advance, first and second detection units having different fire detection conditions, and the first detection unit. When a fire is detected, the first alarm message registered in the alarm message storage unit is selected and output, while when the second detection unit detects a fire, it is registered in the alarm message storage unit. A control unit that selects and outputs the second alarm message.

  More preferably, the first detection unit is a heat sensor, the second detection unit is a smoke sensor, the first alarm message is an evacuation alarm, and the second alarm message is a fire alarm. .

  In addition, the residential fire alarm device according to the present invention further includes a communication unit that transmits a control signal to another alarm device, and when the first detection unit detects a fire, the control unit transmits the control signal to another alarm device. It is good also as a structure which transmits an interlocking request signal and outputs an interlocking alarm message.

  According to the configuration of the present invention, the first detection unit and the second detection unit are provided, and even if any one of them breaks down, the remaining side emits heat exceeding the threshold value or smoke exceeding the threshold value. If it is detected, an alarm message is output, so that the safety becomes higher.

  The first detector is a heat sensor, the second detector is a smoke sensor, the first alarm message is an evacuation alarm, and the second alarm message is a fire alarm. The content of the urgency to be urged is high, and the second warning message is a content of a low urgency to urge confirmation as a fire alarm. In this way, the alarm message can be switched between the smoke sensor that reacts at the early stage of the fire and the heat sensor that reacts when the temperature rises due to the flame being burned. It can be judged whether it is a serious fire that requires it or a fire at the initial fire extinguishing level.

  When the first detector detects a fire, the alarm device is configured to send an interlock request signal to another alarm device and output an interlock alarm message. When a fire occurs, an alarm message is output from all alarm devices. Therefore, there is no possibility that a resident in a remote room will be late.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a functional block diagram showing a circuit configuration of the embodiment. This alarm device 1 includes a first detection unit 11 configured by a thermal sensor, a second detection unit 12 configured by a smoke sensor, a test unit 13 for self-diagnosis of a voltage drop of the power battery 20, and the like. A warning message storage unit 14 in which a plurality of warning messages are registered in advance, a voice output unit 15 that outputs a warning message registered in the warning message storage unit 14, a display unit 16 composed of a light emitting diode, an alarm stop, etc. An operation unit 17 that accepts operations of the above, a communication unit 18 that transmits a control signal to another alarm device wirelessly or by wire, a control unit 19 that includes a microcontroller that controls each unit, and a power supply battery 20. It has.

  2 (a) and 2 (b) are external views when the embodiment is viewed from the front and side, respectively, and shows a state in which the sensor 1 is attached to the wall surface. In the figure, reference numeral 21 denotes a detection head. The first detection unit 11 is exposed on the outer surface of the detection head 21, and the second detection unit 12 is accommodated inside the detection head 21. Yes. Reference numeral 17 a denotes a push button that constitutes the operation unit 17, which is made of a translucent resin and accommodates a light emitting diode that constitutes the display unit 16 therein. Reference numeral 17b denotes a pull string that works in conjunction with the push button 17a. Reference numeral 18 a denotes an antenna of the communication unit 18.

  FIG. 3 is an exploded view for explaining the structure of the detection head 21. The detection head 21 includes a substrate 21a on which a thermistor constituting the first detection unit 11 is mounted, a back cover 21b to which a light emitting unit 12a and a light receiving unit 12b are attached as the second detection unit 12, and air circulation while shielding light. It consists of a labyrinth wall 21c that allows the protection of insects and an insect-protecting protective cover 21d. The back cover 21b, the labyrinth wall 21c, and the insect protection cover 21d are provided with through holes 21e for guiding the first detection unit 11 to the outer surface of the detection head 21 during assembly.

  The 1st detection part 11 is the structure which used the thermistor as a thermal sensor, and measures temperature by letting a test current pass through the thermistor regularly and reading a resistance value. A thermocouple may be used instead of the thermistor.

  On the other hand, the 2nd detection part 12 detects the smoke particle which approached the smoke detection chamber comprised by the back cover 21b and the labyrinth wall 21c, and specifically, the light emission part comprised by the light emitting diode etc. The smoke sensor has a mechanism that irradiates light from 12a and receives the reflected light reflected by the smoke particles by a light receiving unit 12b composed of a photodiode or the like and photoelectrically converts it.

  The alarm message storage unit 14 includes at least a first alarm message to be output when the first detection unit 11 detects a fire and a first alarm message to be output when the second detection unit 12 detects a fire. 2 alarm messages and a notification message to be output when the test unit 13 detects a voltage abnormality of the power supply battery 20 through self-diagnosis are registered in advance.

  For example, the first warning message is an evacuation warning with a highly urgent content that prompts evacuation, such as “Peep, heat detection unit has been activated. Fire, please evacuate”. The alarm message may be a low-urgency content that prompts confirmation, for example, “Peep, smoke detection unit has been activated. Please confirm because there is a possibility of fire”. Further, the notification message may be a message such as “The battery is exhausted.

  The basic operation of the alarm device 1 is as follows. That is, first, the control unit 19 determines whether or not the self-diagnosis timing is reached (for example, every hour). If the self-diagnosis timing is reached, the control unit 19 operates the test unit 13 to perform self-diagnosis. As a result, if the voltage is abnormal, a notification message is output from the voice output unit 15 and the display unit 16 is turned on.

  Next, it is determined whether or not it is a fire detection timing (for example, every 5 seconds). If it is a fire detection timing, the first detection unit 11 and the second detection unit 12 are operated, and the threshold value is set. Determine whether excess heat or smoke has been detected.

  As a result, if the first detection 11 does not detect heat exceeding the threshold value and the second detection unit 12 does not detect smoke exceeding the threshold value, it is determined whether or not it is a self-diagnosis timing. Return.

  However, if the first detection unit 11 detects heat that exceeds the threshold, the evacuation warning message is output from the audio output unit 15 and the display unit 16 blinks at an early cycle.

  Further, if the first detection unit 11 does not detect heat exceeding the threshold value and the second detection unit 12 detects smoke exceeding the threshold value, a fire warning message is output from the audio output unit 15. At the same time, the display unit 16 blinks at a slow cycle.

  Then, after outputting the evacuation warning message or the fire warning message, it is determined whether or not an alarm stop operation has been performed by the operation unit 17 until the next fire detection timing. As a result, if an alarm stop operation is performed, the system waits for a predetermined time while stopping outputting the alarm message.

  On the other hand, when the next fire detection timing is reached without performing the alarm stop operation, the process returns to the process of operating the detection unit 11 and the second detection unit 12 again. According to such a configuration, even if one of the first detection unit 11 and the second detection unit 12 fails, the remaining side detects heat that exceeds the threshold or smoke that exceeds the threshold. Since the alarm message is output, it is possible to provide a highly safe alarm device that operates more reliably.

  FIG. 4 is a flowchart (S101 to S115) showing the processing procedure of the basic operation.

  In this basic operation, when the first detection unit 11 detects the detection of heat exceeding the threshold, the evacuation warning is performed regardless of whether or not the second detection unit 12 detects smoke exceeding the threshold. A message is output. In other words, heat detection is prioritized over smoke detection. This is because the occurrence of high heat can only be caused by a fire, so evacuation should be encouraged by a highly urgent evacuation warning, but the occurrence of smoke can be caused not only by a fire but also by cooking, etc. It is based on the consideration that it is desirable to prompt confirmation with a fire alarm because there should be an initial fire extinguishing level even if a fire has not yet occurred. Also, normally, as the fire progresses, the smoke concentration rises sharply, but the temperature also tends to rise slowly.

  Therefore, the threshold value for heat in the first detection unit 11 should be set to the same threshold value as in the conventional thermal fire alarm, but the threshold value for smoke in the second detection unit 12 is the same as that in the conventional smoke fire. It is desirable to set a threshold value that detects smoke at an earlier stage than the alarm device. This is safer because the smoke concentration has not increased so much, that is, a fire alarm message can be output at the initial fire stage.

  FIG. 5 is a graph illustrating the time change of heat and smoke density in a fire. Here, as a specific example of the more desirable threshold value, 80 ° C. is set as the threshold value for heat, and 15% / m is set as the threshold value for smoke density. At time t1, the second detection unit 12 detects smoke exceeding the threshold value, so that a fire alarm message is output. After that, at time t2, the first detection unit 11 detects heat that exceeds the threshold value, so an evacuation warning message is output.

  The alarm device 1 further includes a communication unit 18 that transmits a control signal to another alarm device, and the control unit sends an interlock request signal to the other alarm device 1 when the first detection unit 11 detects a fire. The system may be configured to transmit a linked alarm message and the present invention may be applied to an alarm system in which a plurality of alarm devices 1 are connected to each other wirelessly or by wire. In that case, since a warning message is output from all the alarm devices 1 in the event of a fire, there is no possibility that a resident in a remote room will be delayed.

It is the functional block diagram which showed the circuit structure of the Example. (A), (b) is an external view when an Example is seen from the front and the side, respectively. It is an exploded view for demonstrating the structure of a detection head. It is the flowchart which showed the process sequence of the basic operation | movement in an Example. It is the graph which illustrated the time change of the heat and smoke density in a fire.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 House fire alarm 14 Alarm message storage part 11 1st detection part 12 2nd detection part 18 Communication part 19 Control part

Claims (3)

An alarm message storage unit in which a plurality of alarm messages are registered in advance;
First and second detectors having different fire detection conditions,
When the first detection unit detects a fire, the first alarm message registered in the alarm message storage unit is selected and output, while when the second detection unit detects a fire, the alarm message A fire alarm for a house comprising a control unit that selects and outputs a second alarm message registered in the storage unit. In claim 1,
The first detector is a heat sensor, and the second detector is a smoke sensor;
The residential alarm device in which the first warning message is an evacuation warning and the second warning message is a fire warning. In claim 2,
A communication unit for transmitting a control signal to another alarm device;
When the first detection unit detects a fire, the control unit transmits a link request signal to another alarm device and outputs a link alarm message.

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