JP2999316B2 - 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 mode or a test recovery mode.

[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.

In a conventional fire alarm system, when an operation test for testing the function of a fire detector by individually applying smoke or heat to the fire detector is performed, it is necessary to sequentially restore the fire detector for each fire detector. Therefore, a recovery switch dedicated to an operation test is provided separately from a fire recovery switch operated when a fire signal is received during fire monitoring.
The recovery switch dedicated to the operation test includes an automatic recovery switch that realizes an automatic recovery mode and a test recovery switch that realizes a test recovery mode.

In the automatic recovery mode, a self-holding type fire detector (for example, a photoelectric smoke detector) having a self-holding function of a fire signal is used to efficiently perform an operation test. After a predetermined time (for example, 8 seconds) after receiving the fire signal, the fire receiver releases the holding of the fire signal of the receiver itself, and the power supply to the self-holding type 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 fire receiver and the fire detector are automatically recovered a predetermined time after the reception of the fire signal.

FIG. 5 is a flow chart showing an example of the operation after turning on the automatic recovery switch in the conventional example.

When the automatic recovery switch is turned on, the 8-second timer built in the microcomputer is reset (S
31), read the signal states of all the lines (S32), and if there is a fire signal (S33), start the fire alarm operation and start the 8-second timer (S34, S3).
5). 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),
When the 8-second timer count-up is completed (S37), the fire detector and the receiver are restored for one second (S38), and S31 is performed.
Return to

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 is turned on, the function of holding the fire signal by the fire receiver is performed. This is the mode for canceling. In other words, the test recovery mode is a mode used for non-self-holding fire detectors.After the test recovery switch is turned on, the non-self-holding fire detector outputs a fire signal, and then self-recovery is stopped by stopping heating. Immediately after the output of the fire signal is stopped, the fire alarm operation of the receiver is canceled. In this way, when an operation test is performed using a non-self-holding fire detector, the receiver recovers immediately after self-recovery of the fire detector when the test recovery switch is turned on. There is an advantage that no wasted time is consumed before the test.

FIG. 6 is a flowchart showing an example of the operation after the test recovery switch in the above-mentioned conventional example is turned on.

When the test recovery switch 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 (S4).
3). Then, when the fire signal is no longer received from the thermal sensor or the like (S42), the fire alarm operation of the receiver is canceled (S44).

[0010]

In the above conventional example, if the automatic recovery mode is set during maintenance and inspection, a fire detector connected to a line other than the inspection line may cause a fire. When the fire signal is sent to the fire receiver upon sensing, the fire signal is not held in the automatic recovery mode on the fire receiver side, so that there is a problem that the detection of the fire may be delayed.

That is, if a fire detector connected to a line other than the inspection line detects a fire and sends a fire signal to the fire receiver during maintenance and inspection, the fire is detected on the fire receiver side. As the local lights on the line are turned on, the fire detection will not be delayed as long as you keep watching the receiver or as long as you look at the receiver when the local lights are on, It is not practically possible to keep watching the receiver at all times, and the probability of looking at the receiver when the district lights are on is not very high. If the recovery mode is set, the discovery of a fire may be delayed. Also, when the test recovery mode is set instead of the automatic recovery mode, the discovery of a fire may be delayed as described above.

In the case of a fire receiver in which signal processing is performed by a microcomputer, a non-lock type switch (so-called soft lock) is used as an automatic recovery switch and a test recovery switch instead of a lock type switch that allows the user to visually check the switch state. Some are using
In this case, just looking at the switch of the receiver does not tell that the automatic recovery switch and the test recovery switch are turned on, and therefore knows that the automatic recovery switch and the test recovery switch are turned on. If this is not the case, the attention that was supposed to be directed to the receiver will not be paid, and this may also delay the discovery of the fire.

[0013] It is an object of the present invention to provide a fire alarm system that does not delay the discovery of a fire even when the automatic recovery mode or the test recovery mode is set during maintenance and inspection.

[0014]

SUMMARY OF THE INVENTION The present invention cancels the automatic recovery mode or the test recovery mode when a fire signal is received simultaneously from at least two lines in the automatic recovery mode or the test recovery mode.

[0015]

According to the present invention, the automatic recovery mode or the test recovery mode is canceled when a fire signal is received simultaneously from at least two lines in the automatic recovery mode or the test recovery mode. When the test recovery mode is set and a fire occurs on a line other than the line under maintenance and inspection, the retention of the fire signal is not released, so the automatic recovery mode or test recovery mode during maintenance and inspection Is set,
Finding a fire is early.

[0016]

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.
N2, IN3, IN4, IN5 and output port OUT
1, OUT2, OUT3, and OUT4. The input port IN1 is a port for inputting a signal indicating whether the main sound stop switch SW1 is on or off.
2 is an automatic recovery switch SW for realizing an automatic recovery mode
2 is a port for inputting a signal indicating whether it is on or off,
The input port IN3 is a port for inputting a signal indicating whether the test restoration switch SW3 for realizing the test restoration mode is on or off, and the input port IN4 is for inputting a signal indicating whether the district sound stop switch SW4 is on or off. The input port IN5 is a port for inputting a signal from the comparator CM for determining whether or not the signal from the fire detector DE is a fire signal.

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 audio device (main bell) MB.

In the automatic recovery mode, the fire receiver RE releases the holding of the fire signal of the receiver itself after a predetermined time from the reception of the fire signal from the self-holding type fire detector, This is a mode in which the fire detector is restored, that is, a mode in which both the receiver and the fire detector are automatically restored a predetermined time after the reception of the fire signal. In the test recovery mode, immediately after the non-self-holding fire detector outputs a fire signal and the non-self-holding fire detector self-recovers and stops outputting the fire signal, the fire of the receiver RE starts. In this mode, the alarm operation is canceled.

The microcomputer MPU releases the automatic recovery mode or the test recovery mode when a fire signal is received simultaneously from at least two lines during the automatic recovery mode or the test recovery mode. Although only one line to which the fire detector DE is connected is shown in FIG. 1, a plurality of lines are actually connected to the fire receiver RE, and the microcomputer MPU has at least two lines. Can recognize that a fire signal has been received at the same time.

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

FIG. 2 is a flow chart showing the operation of the above embodiment. FIGS. 2 (1) and 2 (2)
It is a flowchart which shows operation | movement regarding the automatic recovery switch SW2 and the test recovery switch SW3.

In FIG. 2A, prior to fire monitoring, the microcomputer MPU determines whether the automatic recovery switch SW2 has been turned on, and the automatic recovery switch SW2
Is turned on for a predetermined time, the automatic recovery mode is turned on (S1), and the microcomputer MPU determines whether or not fire signals are received simultaneously from two or more lines (S1).
2) If you receive fire signals from two or more lines at the same time,
The microcomputer MPU forcibly turns off the automatic recovery mode (S3) and performs fire monitoring (S4).

As described above, when the automatic recovery switch SW2 is turned on, maintenance and inspection is being performed, and the automatic recovery mode is set. At this time, if a fire signal is received simultaneously from two or more lines, at least one of them is at least one of them. This is a fire signal from a line other than maintenance and inspection (fire monitoring line). In this case, the fire signal is always held by forcibly turning off the automatic recovery mode. Therefore, even if the automatic recovery mode is set during maintenance and inspection, when a fire occurs, the automatic recovery mode is released, the release of the fire signal holding is prevented, and the main sound is emitted, delaying the discovery of the fire Nothing.

On the other hand, if the automatic recovery mode is off (S1), or if the fire signal is not received simultaneously from two or more lines even if the automatic recovery mode is on (S1),
2) Fire monitoring is performed in the automatic recovery mode (S4).

In FIG. 2B, prior to fire monitoring, the microcomputer MPU determines whether the test recovery switch SW3 has been turned on, and the test recovery switch SW3
Is turned on for a predetermined time, the test recovery mode is turned on (S11), and the microcomputer MPU determines whether or not a fire signal is received simultaneously from two or more lines (S11).
12) If a fire signal is received simultaneously from two or more lines, the microcomputer MPU forcibly turns off the test recovery mode (S13) and performs fire monitoring (S1).
4).

As described above, when the test restoration switch SW3 is turned on, the maintenance and inspection is being performed, the test restoration mode is set, and at this time, if a fire signal is received simultaneously from two or more lines, at least one of them is at least one of them. This is a fire signal from a line other than maintenance and inspection (fire monitoring line). In this case, the fire signal is always retained by forcibly turning off the test recovery mode. Therefore, even if the test recovery mode is set during maintenance and inspection, if a fire occurs, the test recovery mode is released, the release of the fire signal holding is prevented, and the main sound is emitted, delaying the discovery of the fire Nothing.

FIG. 3 is a flowchart showing the operation of another embodiment of the present invention.

In this embodiment, a maintenance main sound stop switch (not shown) (a switch provided separately from the main sound stop switch SW1) is used. Even if the main sound stop switch SW1 is turned on, the main sound sounds when the second fire signal is generated by the subsequent re-sounding function. Even in such a case, the main sound is stopped. The switch that is turned on in this case is the maintenance main sound stop switch.

First, when the main maintenance sound stop switch is turned on and the automatic restoration switch SW2 is turned on, the maintenance main sound stop mode is turned on and the automatic restoration mode is turned on (S21, S22), and two or more lines are provided. If a fire signal is received at the same time (S23), the maintenance main sound stop mode is turned off (S24), and the automatic recovery mode is turned off (S25), and fire monitoring is performed (S26). That is,
If fire signals are received simultaneously from two or more lines during maintenance and inspection, even if one of the fire signals is a fire signal from the maintenance and inspection line, the remaining fire signals will be from lines other than the maintenance and inspection line. In this case, the main sound is sounded by turning off the maintenance main sound stop mode, and the release of the fire signal is prevented by turning off the automatic recovery mode. Is done. That is, even if the automatic recovery mode is set during maintenance and inspection, if a fire signal is received simultaneously from two or more lines, a fire phenomenon occurs on at least one line, the fire signal is held, and the main sound is emitted. So there is no delay in finding the fire.

On the other hand, when the maintenance main sound stop mode is off (S21), even if the automatic recovery mode is not on (S27) or the automatic recovery switch SW2 is on and the automatic recovery mode is on. If fire signals are not received simultaneously from two or more lines (S27, S2
8) In this state, the fire monitoring is continued (S26). That is, when the maintenance main sound stop mode is turned off, it is the same as the case of FIG.

FIG. 3 shows the operation focusing on the automatic recovery switch SW2. However, even when focusing on the test recovery switch SW3 instead of the automatic recovery switch SW2, FIG.
Is the same as the operation shown in FIG. That is, for example, even if “automatic recovery mode” is replaced with “test recovery mode” in FIG. 3, the operation is the same as that in FIG.

FIG. 4 is a flowchart showing the operation of the main maintenance sound stop switch in the embodiment shown in FIG.
This embodiment is an example in which the main sound stop switch SW1 is also used as a maintenance main sound stop switch.

First, when the main sound stop switch SW1 is turned on (S51), if the ON time is short for less than 5 seconds (S52), the main sound stop mode is turned on (S55). In order to indicate that sound is stopped, the main sound stop lamp in the switch light display circuit is turned on (S56). On the other hand, the main sound stop switch S
If the ON time of W1 is a relatively long time of 5 seconds or more (S52), the maintenance main sound stop mode is turned on (S52).
53), the main sound stop lamp blinks to indicate that the maintenance main sound has been stopped (S54). Turning on the maintenance main sound stop mode is the same as turning on the maintenance main sound stop switch, and the microprocessor MPU determines this state (S2).
1).

When the main sound stop switch SW1 is depressed, the main sound stop switch SW1 is turned on for 5 seconds.
Is turned on or the maintenance main sound stop switch is turned on. However, the judgment may be made at a time other than 5 seconds.

Note that the same operation as that of the above receiver is performed.
It can be considered that another receiving unit such as a repeater performs the operation. When the automatic recovery switch SW2 and the test recovery switch SW3 are operated again, the automatic recovery mode and the test recovery mode are turned off, respectively, and when the main sound stop switch SW1 is operated again, the maintenance main sound stop mode and the main sound stop are operated. The mode is turned off.

[0037]

According to the present invention, the automatic recovery mode and the test recovery mode are set during maintenance and inspection, and when a fire occurs on a line other than the line under maintenance and inspection, the automatic recovery mode and test recovery mode are set. Since the mode is released, the fire signal is always held, and therefore, even if the automatic recovery mode or the test recovery mode is set during the maintenance and inspection, the effect of quickly finding a fire is exhibited.

[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 flowchart showing the operation of another embodiment of the present invention.

FIG. 4 is a flowchart showing an operation when the main sound stop switch SW is also used as a maintenance main sound stop switch in the embodiment shown in FIG. 3;

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

FIG. 6 is a flowchart showing an operation after turning on a test recovery switch in the conventional example.

[Explanation of symbols]

 MPU: microcomputer, SW1: main sound stop switch, SW2: automatic recovery switch, SW3: manual recovery switch.

Claims (1)

(57) [Claims] 1. A predetermined time after receiving a fire signal from a self-holding fire detector, the fire receiver releases the holding of the fire signal of the receiver itself and restores the operated self-holding fire detector. In the automatic recovery mode, or after the non-self-holding fire detector outputs a fire signal, immediately after the non-self-holding fire detector self-recovers and stops outputting the fire signal, a fire alarm In a fire alarm system equipped with a test recovery mode for canceling operation, when a fire signal is received simultaneously from at least two lines during the automatic recovery mode or the test recovery mode,
A fire alarm system for canceling the automatic recovery mode or the test recovery mode.