JPH012199A - automatic fire alarm - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 1 Technical Field 1 The present invention provides a repeater for transmitting and receiving signals between fire detectors and fire detectors via a fire detector line by time multiplex transmission. This relates to automatic fire alarm systems in preparation for.

1 Background technology 1 Conventionally, this type of automatic fire alarm system uses a fire alarm (,)
Multiple detectors are connected to the fire detector line connected to the fire detector via a repeater, and an address that specifies each of the repeaters is assigned. There are devices that perform fire monitoring by sending and receiving signals via time-multiplexed transmission via a detector line, and there are conventional line alarm types that issue an alarm by short-circuiting the lines when a fire is detected as a detector. There is a device that allows the use of several sensors. However, with this automatic fire alarm system, if one detector per fire detector line triggers an alarm, there is a limit to the current capacity from the fire receiver to each fire detector line, so Other sensors cannot issue alarms. Therefore, with conventional automatic fire alarms, even if it is known that a fire has occurred, it is difficult to accurately grasp the fire situation such as the spread of the fire, making it difficult to respond appropriately to the fire. was there.

[Objective of the Invention 1 The present invention has been made in view of the above-mentioned points, and its purpose is to be able to accurately notify the fire situation and to appropriately respond to the fire. Our goal is to provide an automatic fire alarm system that can.

Disclosure of the Invention 1 (Configuration) The present invention connects a plurality of detectors to a fire detector line connected to a fire receiver via a repeater, and assigns an address specifying each of the repeaters. , an automatic fire alarm 8! that performs fire monitoring by transmitting and receiving signals by time-multiplexed multiplex transmission via a fire detector line between the fire receiver and each repeater, wherein the detector A line alarm type detector which issues an alarm by shorting the lines when a fire is detected is used as a detector disconnection means for disconnecting the detector from the fire detector line after the alarm is detected by the detector in the repeater. After a fire is detected by the detector, the detector is disconnected from the fire detector line by the detector disconnection means of the repeater, thereby reducing the increase in the current flowing through the fire detector line. This makes it possible for the fire receiver to detect alarms from all detectors.

(Example) An embodiment of the present invention is shown in FIGS. 1 to 3.

In this embodiment as well, a plurality of detectors C are connected to a fire detector line connected to a fire receiver 8 via a repeater B. Each repeater B is assigned an address for specifying the detector C, and when the fire receiver A and each repeater C are opened, the fire detector port m0. ．． The sensing state of the sensor C is monitored by transmitting and receiving signals through time multiplex transmission. Detector C is a conventional line alarm type that issues an alarm by short-circuiting between lines when a fire is detected. It consists of a 5CRQ that is lit at the output, and a confirmation light LD that lights up when the 5CRQ is conductive. This sensor C is connected to a repeater C via a power line 2, and a series circuit of a confirmation light LD and 5CRQ is connected between this power source #Xα2. Relay B transmits and receives No. 46 to and from fire receiver A via fire detector ports #iQ and +, and also transmits and receives 48 which generates power from the DC voltage constantly supplied from fire receiver A. circuit 2, a current regulating circuit 3 inserted between the power output of the transmitting/receiving circuit 2 and the power line Q, 2 and controlling the current supplied from the transmitting/receiving circuit 2 to the sensor C, and the operation of the current regulating circuit 3. and a switching control circuit 4 that controls the fire alarm based on the return signal from the fire receiver A. Note that the current regulation circuit 3 and the switching control circuit 4 constitute a sensor disconnection means, and the fire receiver A
The transmission and reception of signals between the transmitting/receiving circuit 2 of the repeater C and the transmitting/receiving circuit 2 is performed by superimposing a transmission signal on a DC voltage. To elaborate further,
The transmitter/receiver 48 circuit 2 includes a current detector that detects a fire based on the current flowing through the sensor C, and transmits the output of this current detector to a fire contractor, and receives a signal transmitted from the fire receiver A. It consists of a transmitting/receiving section that generates power from the signal transmitted from the fire receiver A, and a power generation section that generates power from the signal transmitted from the fire receiver A. The current regulating circuit 3 is configured to branch the power output of the transmitting/receiving circuit 2 into two systems to supply power to the sensor C, and one system is configured to control the current supplied to the sensor C, for example, by dividing the power output into two systems.
A constant current circuit 5 that regulates the current to mA, and a switch circuit 7 that controls the supply of power from this system to the sensor C are provided,
Similarly, a 3A constant current circuit 6 and a switch circuit 8 are provided in other systems. Note that the constant current circuits 5 and 6 may be current limiting circuits. The switching control circuit 4 is
The switch circuit 7 is activated by the return signal sent back from the fire receiver A after the alarm from the sensor C is sent to the fire receiver.
8 is opened and the sensor C is controlled to be disconnected from the fire detector line 1.

For example, as shown in FIG. 2, three sets of detectors C8 to C3 and repeaters 81 to B are connected to fire detector lines Q and +.

The operation of this embodiment will be described for the case where the When the power switch of fire receiver A is turned on, switch circuits 7 and 8 of all repeaters C are turned on and fire monitoring begins. Now, if a fire is detected by the - sensor CI, then 5CRQ.

turns on and the confirmation light, D, lights up. At this time, a combined current of the constant current circuits 5 and 6, 30a+A in this embodiment, flows through the sensor C1, and this current is detected by the current detecting section of the transmitting/receiving circuit 2, and data indicating a fire is received from the transmitting/receiving section. Send it to device A. The fire receiver A that received this data then detects the sensor C2-C other than this sensor C1.
In order to prevent the confirmation light L D from turning on even if B2.3 detects a fire, a signal to control the opening of the switch circuit 7 is sent to the repeater B2.3. Send to B. This signal is received by the transmitter/receiver circuit 2, which is the A-type equipment B2. B, opens the switch circuit 7 of the current regulation circuit 3 by the switching control circuit 4;

In other words, when a fire is detected at the - sensor C2, the confirmation light LD is not turned on at the other sensors C2, C, and only the holding current of 5CRQ is made to flow to the sensor C. . As a result, fire was detected 4 times! This is to prevent the current flowing through 1 from increasing. Then, when a fire is detected by another sensor C2, at this time, 5CRQ,
When turned on, the current flowing to the sensor C2 is detected by the current detection section of the transmitting/receiving circuit 1 (circuit 2) of the relay B2, and when this current is detected by the current detection section, the same as in the above case is performed The transmitting/receiving circuit 2 transmits data indicating that there is a fire to the fire receiver A.The fire receiver Δ, which has received this data, further sends back a control signal to open the switch circuit 8 to the repeater B2. Based on this return signal, the switching control circuit 4 of the repeater B2 is controlled to open the switch circuit 8. As a result, this sensor C2 is completely disconnected from the fire detection 4 times mQ, and the fire sensor line 0 There is no increase in current of .1. Therefore,
Thereafter, in the station building where a fire was detected by another sensor C3, the fire receiver A can recognize the fire detection state by the sensor C3 in the same manner, and the fire receiver A can recognize the fire detection state by the sensor C3.
By displaying the fire detection status of ,C,, the manager can easily grasp the status of the fire, such as the spread and scale of the fire, and can therefore take appropriate measures against the fire. In addition, in the above explanation, the lighting of the confirmation light L D of the sensor C1 that first detected the fire, and 5CRQ,
Although it was explained that the confirmation light L D is kept in the on state, when the next sensor C2 detects a fire, the confirmation light L D + of the first sensor C7 is kept in the off state. Alternatively, the sensors C1 to C may be
If a fire is detected at 3, these detectors a, -C
, may be separated.

[Effects of the Invention 1] As described above, the present invention connects a plurality of detectors to the fire detector line connected to the fire receiver via a repeater, and provides an address for specifying each of the above-mentioned central a detectors. An automatic fire alarm system that performs fire monitoring by allocating a fire detector and transmitting and receiving signals by time-multiplexing transmission between the fire detector line and each repeater via a fire detector line, As the above-mentioned sensor, a line alarm-type sensor is used that issues an alarm by shorting the lines when a fire is detected, and the alarm detection 1 of the sensor is used in the above-mentioned repeater.
Since a detector disconnection QML means is provided to disconnect the detector from the fire detector line after the fire has been detected by the detector, after the fire has been detected by the detector, this detector can be connected to the relay Cut QI1%
can be disconnected from the fire detector line by means of
Therefore, it is possible to suppress an increase in the current flowing through the fire detector line even after the - sensor has triggered an alarm, and there is an effect that the fire receiver can detect alarms caused by all the sensors.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a system configuration diagram of the same, and FIG. 3 is an explanatory diagram of the operation of the same. A is a fire receiver, B is a fire alarm, C is a detector, 2 is a transmission/reception circuit, 3 is a current regulation circuit, and 4 is a switching control circuit. Agent Patent Attorney Ishi 1) Ai Seven Procedures Tadashi Onguchi'fFj: (Voluntary) July 31, 1988 1, Indication of the case 1988 Hayabusa Patent M No. 158362 2, Name of the invention Automatic fire alarm system 3, Relationship with the case of the person making the correction Patent applicant address 1048 Kadoma, Kadoma City, Osaka Prefecture Name (58
3) Matsushita Electric Works Co., Ltd. Representative Sadao Fujii 4, Agent postal code 530 5, Date of amendment order 6, Number of inventions increased by amendment None [11 Application #
ff8, 4FX, line 8, "Fire bone M device 8) is corrected as 1 fire receiver A]. [2] Same as above, page 4, line 12, 500, line 1, 1
4th stroke [Correct "Medium #l! Device C" in lines 1 to 15 as "Repeater BJ." [3] Same as above, page 4, line 20 [Confirmation light LDJ]
Correct the confirmation light LD, , 1.

Claims (1)

[Claims] (1) Connect multiple detectors to the fire detector line connected to the fire receiver via a repeater, assign an address that specifies each repeater, and connect the fire receiver and each repeater with an address that specifies each repeater. An automatic fire alarm system that performs fire monitoring by transmitting and receiving signals between the fire detector and the fire detector via time-multiplexed transmission via a fire detector line, and which short-circuits the lines when a fire is detected as the detector. The fire alarm system is characterized in that the repeater is equipped with a sensor disconnection means for disconnecting the detector from the fire detector line after the detector detects the alarm. Fire alarm.