JPH07200957A - Fire detector - Google Patents

Abstract

PURPOSE:To provide a fire detector capable of discriminating whether disconnection of a circuit is due to fire or simple disconnection of the circuit, detecting the disconnection of the circuit without releasing a fire detecting state, and equipped with an automatic release function when the fire is extinguished. CONSTITUTION:A voltage detecting part 2 and a state judging part 3 detect whether signal voltages from plural sensors 1a, 1b arranged in parallel with each other and closed when the fire occurs are set in a normal level, a fire level, or a disconnection level, and moreover, judge whether the disconnection due to the fire occurs corresponding to the following state change of a signal of fire level when it is detected, the fire is extinguished without generating the disconnection, or, the diconnection is due to simple disconnection or malfunction, and output a fire signal and/or disconnection signal to a fire detecting part 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detection device having a function of determining whether or not a circuit disconnection is due to a fire based on a signal from a fire detector or the like.

[0002]

2. Description of the Related Art In a device for detecting a fire or flame using a fire detector, a plurality of fire detectors are connected to a receiver, and based on the voltage level from the fire detector input to this receiver. There is a system that can detect the disconnection of the circuit as well as the detection of the fire.

[0003]

However, in the conventional fire detection device, it is not possible to determine whether the circuit is broken due to a fire or the circuit is simply broken without a fire. Therefore, once the fire detection state is entered, the alarm remains issued even if the circuit is simply broken unless the fire detection state is released. This is the same when the fire is extinguished or when the device is malfunctioning. Further, in such a case, the fire detection state is not automatically released, so it is necessary to manually perform the release operation, which is troublesome.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to determine whether a circuit is broken due to a fire or a simple circuit is broken, and the circuit can be detected without releasing the fire detection state. An object of the present invention is to provide a fire detection device that can detect a disconnection and that has an automatic release function when a fire is extinguished.

[0005]

In order to achieve the above object, the present invention provides a fire detecting device for receiving a signal from a fire detector and outputting a signal such as a necessary alarm. In response, when the voltage detection unit detects a signal of the fire level and a voltage detection unit that detects whether the signal voltage is a normal level, a fire level, or a disconnection level, depending on the subsequent state change of the signal, A state determination unit that determines whether a wire breakage due to a fire has occurred or whether the fire has been extinguished without a wire breakage or the fire detector is malfunctioning, and a fire signal and / or a wire breakage signal is output according to the result of this judgment. Be prepared.

[0006]

According to the fire detecting device of the present invention, the transition of the signal voltage level from the fire detector depends on whether the fire detector detects the fire or is normal, whether the circuit is broken due to the fire, or whether the fire detector is simply broken. By utilizing the difference, the voltage detection unit detects whether the detected signal voltage is a normal level, a fire level, or a disconnection level, and when a fire level signal is detected, the state determination unit determines Depending on the subsequent state change, it is determined whether a wire break has occurred due to a fire, the fire has been extinguished without a wire break, or a simple wire break has occurred or a malfunction of the fire detector. A fire signal and / or a disconnection signal can be output according to the determination result.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the fire detection device of the present invention will be described below with reference to the drawings. FIG. 1 is a block configuration diagram of the present device. The present device receives a detection signal from a fire detection unit 1 composed of a plurality of fire detectors, detects a signal voltage level thereof, and a voltage detection unit 2 of this voltage detection unit. The state determining section 3 outputs a fire signal or a disconnection signal to the controller 4 by checking a change in state of the signal voltage level detected by the detecting section 2 with time.

The voltage detector 2 detects whether the level is a fire level, a disconnection level, or a normal level according to the signal voltage. In this device, when a disconnection occurs due to a fire, the signal voltage detected by the voltage detection unit 2 becomes a fire level, and after that, the signal level becomes a disconnection level within a certain time after passing a normal level. Then, the state determination unit 3
By checking the change over time of the signal voltage, it is determined whether or not a wire break has occurred due to a fire. When it is judged that a wire break has occurred due to a fire, the fire signal and the wire break signal are activated. The controller 4 receives the fire signal and the disconnection signal, and performs necessary alarm processing and the like.

The present apparatus may be constructed by being combined with a centralized karaoke management system in which center-side equipment has information for karaoke and each terminal receives the information and outputs video and audio for karaoke. Of course, in that case, the controller 4 is a device of the centralized karaoke management system.

FIG. 2 is a specific circuit configuration diagram of the fire detection unit 1, the voltage detection unit 2, and the state determination unit 3 of this device. The fire detection unit 1 is provided with a plurality of sensors 1a, 1b, ..., Which are provided in parallel with each other and closed when a fire or flame is detected, a terminating resistor R1 (for example, 10 KΩ) connected in parallel with the sensors, and a power supply Vcc (24 V). It is composed of a voltage dividing resistor R2 (1 KΩ) inserted in series with the sensor between the GND and the connection point between the sensor and the voltage dividing resistor R2 is the signal voltage output terminal. With this configuration, the signal voltage level has a relationship of fire level> normal level> disconnection level. The fire detection unit 1
It is also possible to divide into a plurality of groups for each system, to make each group in a parallel relationship, to arrange a storage type receiver in each group, and to send a signal from each receiver to the voltage detection unit 2.

The voltage detector 2 includes two comparison circuits 11 for comparing the signal voltage and the threshold voltage of the fire level (for example, 12 V) and the signal voltage and the threshold voltage of the disconnection level (for example, 1.2 V). It consists of 12.

The state determination section 3 comprises a D flip-flop circuit 13 which receives the outputs of the comparison circuits 11 and 12, a logic circuit 14 which takes the logic of these input / output signals, and a flip-flop circuit 15. Flip-flop circuit 15
Output Q becomes a fire signal, and the D flip-flop circuit 1
The inverted output Q bar of 3 becomes a disconnection signal. Each of points A and B in the figure is H, H in case of fire, L, H in case of normal,
It becomes each level of L and L at the time of disconnection. This state determination unit 3
Measures the time until the disconnection level is reached after the signal voltage once reaches the fire level and then returns to the normal level.
If this is within a certain period of time, it is determined that the disconnection occurred due to a fire.

FIG. 3 is a diagram showing the voltage state of each part (signal voltage, clock, points A to D, fire signal, disconnection signal) of the circuit of FIG. 2 for explaining the operation of the above configuration. (A) shows the case where a wire breakage occurs due to the fire after the fire is detected, and (b) shows the case where the fire is extinguished after the fire detection and the wire returns to normal without the wire breakage. In FIG. 3 (a), the signal voltage becomes the fire level, the fire signal becomes active (Ta1),
After that, the signal voltage goes through the normal level and becomes the disconnection level within a predetermined time (time shorter than the time of the clock cycle), so it is determined that the disconnection has occurred due to fire (Ta2). Then, the disconnection signal is activated and the fire signal continues to be activated.

In FIG. 3 (b), the signal voltage becomes the fire level, the fire signal becomes active (Tb1),
After that, the signal voltage returned to the normal level, and this continued for more than the predetermined time (time for two clocks), so it is determined that the fire was extinguished and the disconnection did not occur (Tb2).
Even if it is a false alarm due to a malfunction and returns to normal (b)
Performs the same operation as.

The controller 4 is informed of the fire signal, the disconnection signal, and the normal state in which these signals are not active. For example, when this device is incorporated in a centralized karaoke management system, the center side device receives these signals and outputs emergency information and further alarm release information to the karaoke terminal. On karaoke terminals,
When these signals are received, the karaoke performance is temporarily stopped, the emergency information and the alarm cancellation information are displayed on the display as an image, and the speaker performs the emergency notification and the alarm cancellation notification by voice.

In addition, the present apparatus can identify and notify disconnection or malfunction that is not a fire, and discriminate them when the fire is extinguished, if it is malfunction, or if it is a simple disconnection. can do. Moreover,
In such a case, the alarm can be automatically released without manual intervention.

The fire detection device of the present invention is not limited to the above-mentioned embodiment, but various modifications are possible. For example, when applied to the karaoke centralized management system as described above, the display of the karaoke terminal device. It is preferable that an emergency call can be made by video and voice using a speaker and a speaker. However, the present invention is not limited to this, and can be applied to a system having means capable of notifying the terminal side of any emergency. Further, this device can be used in combination with a CATV system.

[0018]

As described above, according to the present invention, when the signal voltage from the fire detecting section detects a fire level signal,
Depending on the subsequent state change of the signal, it is possible to determine whether a wire breakage due to a fire has occurred, or whether the fire has been extinguished or a malfunction due to no wire breakage. In other words, it is possible to determine whether the circuit is broken due to a fire or is simply broken.Therefore, if the fire is extinguished or if it is a malfunction, the fire detection status is automatically released without human intervention. Can be done on a regular basis.

[Brief description of drawings]

FIG. 1 is a block diagram of a fire detection device according to an embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of the fire detection device.

FIG. 3 is a time chart of the voltage of each part of the circuit for explaining the operation of the fire detection device.

[Explanation of symbols]

 1 Fire detection unit 2 Voltage detection unit 3 State determination unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiko Hibino 15-1 Naeshiro-cho, Mizuho-ku, Nagoya, Aichi Brasa Industry Co., Ltd. (72) Inventor Osamu Nishimura 15-1 Naeshiro-cho, Mizuho-ku, Nagoya, Aichi Blazer Industry Co., Ltd. (72) Inventor Tatsuo Matsuda 3-23 Shimoshinmachi, Toyama City, Toyama Prefecture Intec Co., Ltd. (72) Inventor Kazuhiro Fujii 3-23 Shimoshinmachi, Toyama City, Toyama Prefecture (72) Inventor Hiroshi Matsuhashi 6-104, Sakurayama-cho, Showa-ku, Nagoya, Aichi Prefecture, EXING Co., Ltd.

Claims (1)

[Claims] 1. A fire detection device for receiving a signal from a fire detector and outputting a necessary alarm signal or the like, and receiving the signal from the fire detector to determine whether the signal voltage is a normal level, a fire level, or a disconnection. When the voltage detection unit that detects the level and the voltage detection unit detects the signal of the fire level, the fire breaks or the fire does not occur depending on the subsequent state change of the signal. A fire detection device comprising: a state determination unit that determines whether the fire is extinguished or that the fire detector is malfunctioning, and that outputs a fire signal and / or a disconnection signal according to the determination result.