JP2957758B2 - Fire alarm system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire alarm system having an automatic recovery function and a test recovery function.

[0002]

2. Description of the Related Art In a conventional fire alarm system, when a fire receiver receives a fire signal from a fire detector when monitoring a fire, the fire receiver holds the fire signal and then operates a fire recovery switch. In addition, the fire detector releases the holding of the fire signal, and lowers the power supply to the fire detector to a predetermined voltage or less, thereby restoring the operated fire detector.

FIG. 3 is a block diagram showing a conventional fire detector RE1. When an operation test for testing the function of a detector by individually applying smoke or heat to the detector is performed, the fire detector RE1 is sequentially turned on for each sensor. Therefore, a recovery switch dedicated to the operation test is provided separately from a fire recovery switch operated when a fire signal is received during fire monitoring. As this conventional test-only recovery switch, an automatic recovery switch SW2 that realizes an automatic recovery mode is used.
And test recovery switch SW3 to realize test recovery mode
The microcomputer MPU1 turns on the automatic recovery switch SW2, the test recovery switch SW3,
It has input ports IN2 and IN3 for inputting the OFF state.

In the automatic recovery mode, a fire signal from the self-holding fire detector is provided to efficiently perform an operation test of a self-holding fire detector (for example, a photoelectric smoke detector) having a self-holding function of the fire signal. After a predetermined time (e.g., 8 seconds) after receiving the signal, the fire receiver releases the holding of the fire signal of the receiver itself, and the power supply to the self-holding fire detector is turned off for a predetermined time by a predetermined voltage. This is a mode to recover the activated self-holding fire detector by lowering it below. That is, the automatic recovery mode is a mode in which both the receiver and the fire detector are automatically recovered a predetermined time after the reception of the fire signal.

FIG. 4 is a flow chart showing the operation after the automatic recovery switch SW2 in the conventional example is turned on.

When the automatic recovery switch SW2 is turned on, the 8-second timer built in the microcomputer MPU1 is reset (S31), and the signal states of all the lines are read (S32). If there is a fire signal (S33), The fire alarm operation is started and the 8-second timer is started (S34, S35). Then, after reading the signal states of all the lines and turning on the district lights of the fire lines that have received the fire signal (S36), if the 8 second timer count-up ends (S37), the fire detector and the receiver RE1 are connected. It recovers for one second (S38) and returns to S31.

However, in the automatic recovery mode, heating is performed in a short time (within 8 seconds) by using a non-self-holding fire sensor (for example, a constant temperature heat sensor using a bimetal) that does not self-hold a fire signal. When shut down, the heat sensor recovers immediately, but must wait 8 seconds for the receiver to recover.

On the other hand, the test recovery mode is a mode for efficiently performing an operation test of the non-self-holding fire detector. When the test recovery switch SW3 is turned on, the fire signal is held by the fire receiver RE1. In this mode, the function is released. In other words, the test recovery mode is a mode used for the non-self-holding fire detector, and after the test recovery switch SW3 is turned on, the non-self-holding fire detector outputs a fire signal, and the self-holding is stopped by heating. In this mode, the fire alarm operation of the receiver RE1 is canceled immediately after the recovery and the stop of the output of the fire signal. In this way, when an operation test is performed using a non-self-holding fire detector, when the test recovery switch SW3 is turned on, the receiver RE1 recovers immediately after the self-recovery of the fire detector. There is an advantage that no useless time is consumed before the operation test.

FIG. 5 is a flow chart showing the operation after the test recovery switch SW3 in the conventional example is turned on.

When the test recovery switch SW3 is turned on, the signal states of all the lines are read (S41). If a fire signal has been generated (S42), a fire alarm operation is started (S43). Then, when the fire signal is no longer received from the heat sensor or the like (S42), the fire alarm operation of the receiver RE1 is canceled (S44).

[0011]

In the above conventional apparatus, when a non-self-holding fire detector is used and the automatic recovery switch is turned on, even if the fire detector no longer detects a fire, the receiver is not operated. In order to recover, it is necessary to wait for about 8 seconds, and the time from when the non-self-holding fire detector stops detecting a fire to when the receiver is recovered is unnecessary time. However, there is a problem that an operation test of a non-self-holding fire detector generates a useless time. The more the number of non-self-holding fire detectors, the more a wasteful time occurs in the operation test. There's a problem.

Further, in the test recovery mode in the above-mentioned conventional example, although there is an advantage that no wasted time is generated in the operation test of the fire detector, the fire detector is not recovered, so that the self-holding fire detector is recovered. There is a problem that you can not.

According to the present invention, the operation test of the fire detector can be performed without switching the test recovery switch and the automatic recovery switch as in the prior art, and the operation test of the fire detector is wasted. It is an object of the present invention to provide a fire alarm system that does not generate a fire and that can reliably recover a fire from a self-holding fire detector.

[0014]

According to the present invention, when a receiving unit receives a fire signal from a fire detector after an automatic recovery switch is operated, the receiving unit holds the fire signal and a predetermined timer. When the receiving unit continues to receive the fire signal from the fire detector until a predetermined time has elapsed from the start of the timer, the fire detector and the receiving unit are restored, and on the other hand, the start of the timer is started. When the receiving unit stops receiving a fire signal from the fire detector before a predetermined time elapses from the predetermined time, the receiving unit is restored.

[0015]

FIG. 1 is a block diagram showing an example of a fire receiver RE according to one embodiment of the present invention.

The microcomputer MPU provided in the fire receiver RE executes the program of the flowchart shown in FIG.
0, IN1, IN4, IN5 and output ports OUT1,
OUT2, OUT3, and OUT4. The input port IN0 is a port for inputting a signal indicating whether the automatic recovery switch SW0 is on or off.
W0 has both functions of the automatic recovery switch SW2 and the test recovery switch SW3 in the conventional example.

When the fire receiver RE receives a fire signal from the fire detector DE after the automatic recovery switch SW0 is operated, the microcomputer MPU holds the fire signal and outputs a predetermined signal. When the fire detector RE continues to receive the fire signal from the fire detector DE until a predetermined time has elapsed from the start of the timer, the fire detector DE, the fire receiver RE, and the timer On the other hand, before the predetermined time elapses from the start of the timer, the fire receiver R
When E stops receiving a fire signal from the fire detector DE, the fire receiver RE is restored and its timer is reset. The microcomputer MPU has a built-in timer having a timer time of 8 seconds as a predetermined time.

The input ports IN1 and IN4 are respectively a main sound stop switch SW1 and a local sound stop switch SW4.
The input port IN5 is a port for inputting an output signal of a comparator CM for comparing a signal level from the fire detector DE.

The output ports OUT1 and OUT2 are ports for outputting signals for turning on the indicator lamps L1 and L2, respectively, and the output port OUT3 is a port for outputting a signal for controlling the display operation of the switch caution lamp LA. The output port OUT4 is a port that outputs a signal for controlling the operation of the main bell B when the switch b of the main audio device is turned on. The illustration of the fire recovery switch and the like is omitted.

Next, the operation of the above embodiment will be described.

FIG. 2 is a flowchart showing the operation of the above embodiment.

First, when the automatic recovery switch SW0 is turned on, a timer having a timer time of 8 seconds is reset (S1), and the signal states of all the lines are read (S2). At this time, a fire signal is generated. If it is (S3), the fire alarm operation is started (S4), the 8-second timer is started (S5), the signal status of all the lines is read, and the district light of the fire line that has received the fire signal is turned on (S6). ). If a fire signal is input from another line before the 8-second timer counts up, the corresponding fire area is also displayed.

Then, the fire signal is continuously received while the timer is counting 8 seconds, and when 8 seconds have elapsed (S7, S8), the fire detector DE and the receiver RE are set to 1
Seconds, the fire alarm action is automatically canceled (S
9).

Therefore, in the above embodiment, since the fire receiver RE and the fire detector DE are restored, the self-holding fire detector can also recover from the fire. Since the fire recovery is performed after a predetermined time, there is no wasted time in the operation test of the fire detector, and there is no need to switch between the test recovery switch and the automatic recovery switch as in the past. Excellent operability at the time.

On the other hand, an 8 second timer is started from the time when the fire signal is received. If the fire signal disappears during the counting of 8 seconds (S7), the receiver RE is restored and the fire alarm operation is performed. Release (S11). After that, 8
Since the count of the second timer is not required, the 8-second timer is reset (S12), and the process returns to S2.

As described above, if the fire signal disappears while counting eight seconds, the receiver RE
The time from when the non-self-holding fire detector self-recovers and no longer outputs a fire signal until the receiver recovers is almost zero. There is an advantage that no useless time is generated in the operation test.

The above embodiment shows an example in which the fire receiver RE is not provided with a storage function.
If the storage function is provided in E, the storage operation of the receiver RE is canceled when the automatic recovery switch SW0 is turned on.

In the above embodiment, when the automatic recovery switch SW0 is turned on, the operation shown in FIG.
Although the operation is released when the switch is turned off, the operation shown in FIG. 2 is started when the automatic recovery switch SW0 is turned off, and the operation is released when the switch is turned on. Well, that is, the automatic recovery switch SW0
It is sufficient that the operation shown in FIG. 2 is started when is operated. Further, in the above embodiment, the timer time is set to 8 seconds, but another time may be set as the timer time.

It may be considered that the same operation as that of the above receiver is performed by another receiving unit such as a repeater.

[0030]

According to the present invention, an operation test of a fire detector can be performed without switching between a test recovery switch and an automatic recovery switch as in the prior art. There is an effect that wasteful time is not generated and the self-holding type fire detector can surely recover the fire.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment.

FIG. 3 is a block diagram showing a conventional fire receiver RE1.

FIG. 4 is a flowchart showing an operation after turning on an automatic recovery switch SW2 in the embodiment.

FIG. 5 is a flowchart showing an operation after turning on a test recovery switch SW3 in the conventional example.

[Explanation of symbols]

 MPU: microcomputer, SW0: automatic recovery switch, IN0: input port for automatic recovery switch.

Claims (1)

(57) [Claims] When a receiving unit receives a fire signal from a fire detector after an automatic recovery switch is operated, the receiving unit holds the fire signal, starts a predetermined timer, and starts the timer. Until a predetermined time elapses from the start of the above, when the receiving unit continues to receive the fire signal from the fire detector, the fire detector and the receiving unit are restored, while, from the start of the timer A fire alarm system, wherein the receiving unit is restored when the receiving unit stops receiving the fire signal from the fire detector before a predetermined time has elapsed.