JP2002074536A - Automatic fire alarm system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic fire alarm system which receives a detection signal of a fire detector and can easily decide whether a fire breaks out. SOLUTION: This system is provided with the fire detector 2 having a microphone 27 for inputting ambient voice and converting the voice into an electric signal and a voice transmitting part 28 for transmitting the electric signal outputted from the microphone 27 through a detector line 8 and with an automatic fire alarm receiver 3 having a signal processing part 37 for receiving a fire detection signal from a transmission signal inputted from the fire detector 2 among a plurality of fire detectors connected to the detector line 8 and detecting the voice electric signal from the transmission signal, and a speaker 3A for converting the electric signal output of the part 37 into voice, and outputs the voice from the speaker 3A, when the receiver 3 receives the fire detection signal from the fire detector 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-fire alarm system.

[0002]

2. Description of the Related Art Conventionally, in a self-fire alarm system,
In order to detect fires as early as possible and to reduce non-fire reports as much as possible, prepare multiple types of fire detectors that detect heat or smoke, with different detection sensitivities, and adjust the sensitivity according to the conditions of the installation location. Different fire detectors.

Further, recently, a temporal change of a detection signal of generation of heat or smoke is calculated, for example, even if one fire detector is issued, a plurality of fire detectors are output until a fire is issued. A self-fire alarm system with a judgment function such as not judging that a fire has occurred is also introduced.

[0004]

However, in the above-mentioned conventional technique, even if the fire detector operates and the self-fire alarm receiver notifies the user of the fire, the fire-prevention center where the self-fire alarm receiver is installed is used. Until a resident disaster prevention officer checks the site conditions in the area where the fire was reported, it is impossible to judge whether or not it is an actual fire and take action.

[0005] That is, until a person in charge of disaster prevention directly confirms that there is no non-fire report due to, for example, temporary burning of a substance in a room or the filling of tobacco smoke in a closed room. Fire fighting is not performed. Therefore, there is a problem that fire extinguishing activities are delayed when a fire actually occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to receive a detection signal of a fire detector and easily determine whether a fire has occurred or not. It is to provide a system.

[0007]

In order to achieve the above object, in a self-fire alarm system according to the present invention, a microphone for inputting ambient sound and converting it into an electric signal and an electric signal output from the microphone are provided. A fire detector having a sound transmission unit for transmitting a signal through the detector line, and a fire detection signal from a transmission signal input from the fire detector among a plurality of fire detectors connected to the detector line. A self-fire alarm receiver comprising: a signal processing unit for receiving and detecting the audio electric signal from the transmission signal; and a speaker for converting an electric signal output of the signal processing unit into audio. Output the sound from the speaker when a fire detection signal is received from the fire detector.

Accordingly, when the self-fire alarm receiver receives a fire detection signal from the fire sensor, the self-fire alarm receiver receives a signal from the fire sensor among the plurality of fire sensors connected thereto. When a fire detection signal is received from an input transmission signal, a signal processing unit provided in the self-fire alarm receiver sets a fire detector that has output the fire detection signal from the transmission signal. The electric signal of the sound of the surrounding environment is detected, and the electric signal is converted into sound by a speaker and output.

It is preferable that an emergency broadcast amplifier for receiving the electric signal from the self-fire alarm receiver and outputting the sound via a loudspeaker provided therein is additionally provided. In this case, the sound of the surrounding environment where the fire detector that has output the fire detection signal is output from the emergency broadcast amplifier attached to the self-fire alarm receiver via the loudspeaker provided therein.

[0010]

1 to 4 show an embodiment corresponding to claims 1 and 2 of the present invention. FIG. 1 is a schematic diagram of a self-fire alarm system according to an embodiment of the present invention. A configuration diagram showing
FIG. 2 is a circuit block diagram showing a fire detector of the self-fire alarm system, FIG. 3 is a circuit block diagram showing a self-fire alarm receiver of the self-fire alarm system, and FIG. It is explanatory drawing which shows the step of fire occurrence determination.

The self-fire alarm system 1 of this embodiment has a microphone 27 for inputting surrounding sounds and converting them into electric signals, and a sound for transmitting electric signals output from the microphone 27 via the sensor line 8. Fire detector 2 having transmission unit 28
Signal processing for receiving a fire detection signal from a transmission signal input from the fire detector 2 among the plurality of fire detectors connected to the detector line 8 and detecting the audio electric signal from the transmission signal A self-fire alarm receiver 3 having a unit 37 and a speaker 3A for converting an electric signal output of the signal processing unit 37 into sound, and the self-fire alarm receiver 3 receives a fire detection signal from the fire detector 2 Then, the sound is output from the speaker 3A when the sound is input.

In the self-fire alarm system 1 according to the embodiment, an emergency broadcast amplifier which receives the electric signal from the self-fire alarm receiver 3 and outputs the sound via a loudspeaker 5 provided therein. 4 is also attached.

More specifically, in the self-fire alarm system 1, a plurality of analog fire detectors including the fire detector 2 having the above-described configuration are connected to a multiplex transmission type detector line 8 using the two transmission lines. The self-fire alarm receiver 3 and the emergency broadcast amplifier 4 are provided. In addition to the multiplex transmission system, the sensor line may be a general two-wire transmission wiring system in which an audio line is added as a sensor line.

In this case, the fire detector 2 is an analog photoelectric smoke detector, and as shown in FIG. 2, a light emitting circuit 22, an LED element 23, a light receiving circuit 24,
A photodiode element (PD element) 25 and a transmission input / output circuit 26 for performing multiplex transmission with a self-fire alarm receiver 3 described later.
, A microphone 27, an audio transmission circuit 28 that multiplexes an audio signal of an electric signal output from the microphone 27 and superimposes it on a transmission signal, a power supply circuit 29, and a CPU 21 that controls these circuits.

The smoke detecting means includes a circuit board, an LED element 23 mounted on the circuit board,
A light emitting circuit 22 for intermittently emitting light from the D element 23, a PD element 25, and a light receiving circuit 24 for processing light receiving signals of the PD element 25 and performing smoke detection are housed therein. LED element 2
3 and the PD element 25 are arranged such that the optical axis of the LED element 23 and the optical axis of the PD element 25 intersect each other in the smoke detection chamber inside from the air introduction hole provided around the lower surface of the fire detector 2. The light from the LED element 23 is irregularly reflected by the smoke particles flowing into the smoke detection chamber, and when the scattered light due to the irregular reflection is received by the PD element 25, the presence of the smoke particles is detected and the smoke is detected. The occurrence of is detected.
Note that this smoke detection signal is output to the CPU 21.

In this case, the microphone 27 is provided below the smoke detecting means, and the audio electric signal output from the microphone 27 is always input to the audio transmission circuit 28. It has become. This audio transmission circuit 28
In addition to the above-described multiplexing of the audio signal, when the audio electric signal output from the microphone 27 becomes lower than a predetermined level for a certain period of time, the surroundings of the fire detector 2 become unmanned, An unmanned detection signal is output to the CPU 21.

The CPU 21 is formed of, for example, a microcomputer. When a smoke detection signal is input from the light receiving circuit 24 and the unmanned detection signal is input from the voice transmission circuit 28, the CPU 21 The signal and the sound electric signal are superimposed and output to the self-fire alarm receiver 3 to be described later via the sound transmission circuit 28.

In this case, the self-fire alarm receiver 3 has a judging function of calculating a temporal change of a detection signal of generation of heat or smoke to detect a fire, and is installed in each fire detection area. An emergency broadcast amplifier 4 having a loudspeaker 5 is provided. As shown in FIG. 3, a transmission input / output circuit 32, a switch input circuit 33 serving as an operation unit, a display circuit 34 serving as a fire display unit, and an alarm output circuit 35 for giving a fire alarm by alarm or voice output. A sound detection circuit 37 serving as a signal processing unit 37 for detecting the electric signal of the sound from the transmission signal input from the fire detector 2; An audio amplification circuit 38 for amplifying the output of the audio detection circuit 37, an audio output circuit 39 serving as an impedance matching circuit with the emergency broadcast amplifier 4, a speaker 3A,
A CPU 31 serving as a control circuit.

When the CPU 31 receives a fire detection signal from the fire detector 2 via the transmission input / output circuit 32, the CPU 31 calculates the temporal change of the smoke generation detection signal so that the smoke detection level is constant. When the signal level becomes equal to or higher than a predetermined level during the time, the audio signal detected by the audio detection circuit 37 is output to the audio amplification circuit 38. Therefore, when a fire is detected, sound is output from the speaker 3A together with the fire alarm.

In this apparatus, sound is also output to the loudspeaker 5 via a signal processing section of the emergency broadcast amplifier 4 attached to the self-fire alarm receiver 3, so that the self-fire alarm reception is performed. The sound is output via the loudspeaker 5 even at a place far away from the disaster prevention center where the device 3 is installed.

Next, a step of judging a fire occurrence in the self-fire alarm system having the above configuration will be described with reference to FIG. When a fire alarm is issued from the fire detector 2, the sound input to the microphone 27 of the fire detector 2 that has issued the alarm is connected to the speaker 3 A of the self-fire alarm receiver 3 and the emergency broadcast amplifier 4. Output from the loudspeaker 5. At this time, when a person in charge of disaster prevention is present at a disaster prevention center where the self-fire alarm receiver 3 is installed (step 1),
From the sound around the fire detector 2 that the disaster prevention staff can hear from the speaker 3A of the self-fire alarm receiver 3,
It is determined whether the report is a non-fire report due to tobacco smoke or the like (step 2). If it is determined that the report is a fire, immediate measures are taken to deal with the fire (step 3).

For a person inside the building, an actual fire is detected at a place far away from the fire detector 2 than a sound around the fire detector 2 that can be heard through the loudspeaker 5 of the emergency broadcast amplifier 4. It is determined whether the alarm has occurred or whether it is a non-fire report due to tobacco smoke or the like (step 4). At this time,
When it is impossible to judge by the voice alone, actual site confirmation is performed to judge whether it is a fire or a non-fire (Step 5), and a fire occurrence countermeasure is immediately taken as described above (Step 3).

Therefore, according to the self-fire alarm system described above, when the self-fire alarm receiver 3 receives a fire detection signal from the fire detector 2, the self-fire alarm receiver 3 switches the plurality of connected self-fire alarm receivers. When a fire detection signal is received from a transmission signal input from the fire detector 2 among the fire detectors, a signal processing unit 3 provided in the self-fire alarm receiver 3
At 7, the electric signal of the sound of the surrounding environment where the fire detector that has output the fire detection signal is detected is detected from the transmission signal, and the electric signal is converted into sound by the speaker 3A and output. Therefore, it is possible to easily determine whether or not a fire has occurred by receiving the detection signal of the fire detector 2.

Then, from the emergency broadcast amplifier 4 attached to the self-fire alarm receiver 3, the sound of the surrounding environment where the fire detector 2 which has output the fire detection signal is installed is transmitted through a loudspeaker 5 provided therein. The self-fire alarm receiver 3
It is easy to determine whether or not a fire has occurred even in a place other than the place where is installed.

It should be noted that the self-fire alarm system of the present invention includes, in addition to the above-described one, a sub receiver 7 provided with a speaker (not shown) as shown in FIG. Needless to say, the present invention includes those of various embodiments, such as those connected via.

[0026]

The present invention is embodied as in the above embodiment. In the self-fire alarm system according to the first aspect, a self-fire alarm receiver receives a fire detection signal from the fire detector. When the self-fire alarm receiver receives a fire detection signal from a transmission signal input from the fire sensor among the plurality of fire sensors connected to the self-fire alarm receiver, the self-fire alarm receiver is provided in the self-fire alarm receiver. The signal processing unit detects the electric signal of the sound of the surrounding environment where the fire detector was installed from the transmission signal, and converted the electric signal into sound by the speaker. Then, the detection signal is received from the fire detector, and it can be easily determined whether or not a fire has occurred.

Further, in the self-fire alarm system according to the second aspect, the surrounding environment in which a fire detector that has output a fire detection signal from an emergency broadcast amplifier attached to the self-fire alarm receiver is installed. Is output via the loudspeaker provided in the device, so that it is possible to easily determine whether or not a fire has occurred in a place other than the place where the fire alarm receiver is installed, which is convenient.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a self-fire alarm system according to an embodiment of the present invention.

FIG. 2 is a circuit block diagram showing a fire detector of the self-fire alarm system.

FIG. 3 is a circuit block diagram showing a self-fire alarm receiver of the self-fire alarm system.

FIG. 4 is an explanatory view showing steps of a fire occurrence judgment of the self-fire alarm system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Self-fire alarm system 2 Fire detector 27 Microphone 28 Sound transmission part 3 Self-fire alarm receiver 37 Sound detection circuit (signal processing part) 3A speaker 4 Emergency broadcast amplifier 5 Loudspeaker 8 Detector line

Claims (2)

[Claims] 1. A fire detector comprising: a microphone for inputting ambient sound and converting it into an electric signal; and a sound transmission unit for transmitting an electric signal output from the microphone via a detector line, and a fire detector line. A signal processing unit for receiving a fire detection signal from a transmission signal input from the fire sensor among the plurality of fire detectors connected thereto and detecting the audio electric signal from the transmission signal; A self-fire alarm receiver having a speaker that converts an electrical signal output into sound, such that when the self-fire alarm receiver receives a fire detection signal from the fire detector, the sound is output from the speaker. Self-fire alarm system. 2. An auto-fire system according to claim 1, further comprising an emergency broadcast amplifier for inputting said electric signal from said self-fire alarm receiver and outputting said sound via a loudspeaker provided therein. Information system.