JPH0512867Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a storage-type fire alarm receiver with a so-called storage function that determines that there is a fire when a fire signal from a fire detector is obtained for a predetermined period of time or more. The present invention relates to a storage type fire alarm receiver in which the storage function is canceled during an operation test and a detection operation is performed immediately when a fire signal is obtained from the test.

(Prior Art) In recent years, so-called storage-type fire alarm receivers have been developed that do not detect a fire immediately upon receiving a fire signal from a fire detector, but instead set a predetermined storage time to prevent false alarms. Research and development is progressing.

In such storage type fire alarm receivers, for example, when a fire signal from a heat sensor is received, the power supply to the heat sensor is cut off for a predetermined period of time.
It is shut off for a time t1, and only when a fire signal is obtained from the heat sensor again after the cutoff time t1 has elapsed, it is determined that there is a fire and a fire detection operation is performed. On the other hand, when the power supply is cut off, fire monitoring is stopped, and when the first fire signal is received from a fire detector, such as an ionization sensor, which requires a predetermined recovery time 2 after the power supply is resupplied, the storage control section is activated. Let the cutoff time
After a predetermined prohibition time (accumulation time) t3 that is longer than t1 has elapsed, if a fire signal is obtained within a predetermined alarm time t4, it is determined that there is a fire and a fire detection operation is performed, and the fire detection operation is latched and the fire reception status is detected. Fire alarms were to be issued continuously.

(Problem that the invention aims to solve) By the way, in order to test whether the fire detectors are functioning properly, we manually or automatically temporarily apply heat or smoke to each fire detector installed at the site. In addition, so-called operation tests are being conducted to test whether the fire detector actually operates and whether or not the fire alarm receiver receives a fire signal. Therefore, in the fire alarm receiver having the storage function described above, the storage control section is activated, and after a predetermined storage time has elapsed, a detection operation is performed, and the detection operation is latched to receive and display a fire signal based on an operation test. Therefore, the test work time required for each fire detector becomes longer due to the accumulation time. In addition, in order to maintain low impedance of the fire detector and cancel the reception indicator function of the fire alarm receiver during the operation test, the recovery switch installed on the fire alarm receiver was operated for each operation test of each fire detector. The test work was complicated because it was necessary to hold the detector and release the display function of the fire alarm receiver to proceed with the test work on the next fire detector.

For this reason, there has been a demand for an accumulation-type fire alarm system that can perform test operations quickly and easily during operational tests.

(Means for solving the problems) This invention was made in view of the above problems.
In order to provide a storage type fire alarm receiver that can perform operational tests in a short time and efficiently without increasing the cost of the fire alarm receiver, a fire detection system is developed as shown in Figure 1. After a predetermined prohibition time (accumulation time) t3 has elapsed after receiving the fire signal (first report) from the device 2, a timer circuit 17 outputs an alarm signal only for a predetermined alarm time t4, and a timer circuit 17 receives the fire signal. power supply cutoff units 11, 12, which cut off the power supply to the fire detector 2 for a predetermined time t1 and restore the fire detector 2 within the prohibited time t3 after a predetermined time t0;
5, 5a, the notification signal (timer output) from the timer circuit 17, and the power cutoff section 11, 12, 5, 5
A fire detection drive circuit 15 performs a detection operation based on the AND output of the fire signal (second report) after the power supply is cut off by a, and latches the detection operation, and an alarm is issued based on the detection signal from the fire detection drive circuit 15. In a storage type fire alarm receiver equipped with an alarm unit 7 that displays a display, a release signal is output in response to a test signal output by operating a test switch 8 during an operation test to release the latch function of the fire detection drive circuit 15. At the same time, a latch release unit 18 prohibits the timer output of the timer circuit 17, and the fire detection drive circuit 15 generates an AND output from the release signal output from the latch release unit 18 and the fire signal caused by the test alarm of the fire detector 2. and an AND circuit 19 which outputs an output to display an alarm, and by releasing the latch function of the fire detection drive circuit 15 when the test switch 8 is operated, the alarm display is made only when a fire signal is input due to a test alarm. , the alarm display is restored by restoring the fire detector 2 by operating the power cut-off parts 11, 12, 5, 5a after a predetermined time t0 has elapsed since the input of the fire signal.

FIG. 2 is a general configuration diagram showing one embodiment of the present invention, and FIG. 1 is a circuit diagram showing the essential parts of the present invention.

First, to explain the configuration, in Fig. 2, 1 is a fire alarm receiver, and a pair of power signal lines L1 and L2 are drawn out from the fire alarm receiver 1, and connect a plurality of fire detectors 2. . fire detector 2
An appropriate fire detector such as a heat detector or an ionization fire detector is used, and when a fire is detected, a fire signal is transmitted to the fire alarm receiver by maintaining a low impedance between the pair of power signal lines L1 and L2. Send to 1. In the fire alarm receiver 1, 3 is a constant voltage power supply that supplies power. 4 is a fire receiving circuit, which includes a relay that operates by detecting a fire signal from the fire detector 2, that is, a low impedance between a pair of power signal lines L1 and L2, and receives the fire signal and operates a relay contact 4a. Close. 5 is a relay for power cutoff, which forms a power cutoff section together with a power cutoff drive circuit to be described later, and is connected to terminal P6.
The relay 5 is actuated by a cutoff signal from the relay 5, and the relay contact 5a is opened to cut off the power supply to the fire detector 2 and to make the fire receiving circuit 4 inactive. Reference numeral 6 designates an accumulation control section which inputs a fire signal from a terminal P4 and accumulates it for a predetermined period of time, and when it determines that there is a fire, outputs a detection signal to the alarm section 7 via a terminal P5 and instructs an alarm display. 8 is a test switch, which is closed when testing the operation of fire detector 2 and connects terminal P.
A test signal is sent by outputting OV to 3.
Terminals P1 and P2 are power input terminals, and 9 is a recovery switch.

Next, an embodiment of the internal configuration of the storage control section 6 shown in FIG. 2 will be described based on FIG. 1. Reference numeral 10 is a constant voltage power source that supplies power. Constant voltage power supply 1
A delay circuit 11 is connected between the power lines drawn out from terminal P4, and when a fire signal that continues for more than a predetermined time is obtained from terminal P4, a predetermined delay time t0, for example, 3 seconds has elapsed within the duration of the fire signal. , a pulse signal is intermittently output for a predetermined cutoff time t1, for example, 3 seconds. Reference numeral 12 denotes a power cutoff drive circuit, which inputs the pulse signal from the delay circuit 11 and outputs a cutoff signal to the terminal P6 and the reception frame time setting circuit 13 to cut off the power supply to the fire detector 2 only for the cutoff time t1. When the reception frame time setting circuit 13 receives the cutoff signal from the power cutoff drive circuit 12,
After the cutoff time t1 has elapsed, a predetermined reception frame time t5, e.g.
Outputs a signal for only 0.5 seconds. Note that the reception window time t5 is set such that the reception window time t5<recovery time t2, and is set so that a fire signal from a fire detector having a recovery time cannot be received. 14 is an AND circuit, which drives the fire detection drive circuit 15 with an AND output of the fire signal from the terminal P4 and the output signal from the reception frame time setting circuit 13. The fire detection drive circuit 15 has a built-in flip-flop circuit with a latch function, and when a signal output from the AND circuit 14 or the AND circuit 16 is obtained, a detection operation is performed, and the detection operation is latched to continue the detection signal. and outputs it to terminal P5. 17 is a timer circuit, and when a fire signal from terminal P4 is input, after a predetermined prohibition time (accumulation time) t3, for example 20 seconds has elapsed, the alarm signal is sent to one input of the AND circuit 16 only for an alarm time t4, for example 60 seconds. Output to the gate. The other input gate of the AND circuit 16 is given a fire signal from the terminal P4. Reference numeral 18 denotes a latch release unit, which issues a release command to release the latch function of the fire detection drive circuit 15 when a test signal from the terminal P3 is input. That is, the release signal is output to the fire detection drive circuit 15 and is also given to the input gate of the AND circuit 19, and when the AND circuit 19 outputs the AND output of the release signal and the fire signal to the fire detection drive circuit 15, the fire is detected. The drive circuit 15 is an AND circuit 1
The detection operation is turned on and off based on the signal output of 9. Further, the latch release unit 18 outputs a latch release signal to the timer circuit 17 to prohibit the timer circuit 17 from outputting a timer. That is, even if the timer circuit 17 starts the timer operation by inputting the fire signal from the terminal P4, it stops sending out the notification signal to the AND circuit 16 when the release signal from the latch release section is input.

Next, the operation will be explained.

First, refer to the timing chart in Figure 3,
The operation when a heat sensor detects a fire as a fire detector will be explained. Furthermore, since the heat sensor almost never malfunctions, the receiver performs fire reception processing without accumulation.

In FIG. 2, a fire signal from a fire detector 2 is received by a fire receiving circuit 4, and a relay contact 4a is closed by turning on an internally provided receiving relay. When the relay contact 4a is closed, a fire signal is output to the storage control section 6 via the terminal P4. When the fire signal from the terminal P4 is input to the delay circuit 11, after the delay time t0 has passed as shown in FIG. 3, the signal is outputted only during the cutoff time t1 to activate the power cutoff drive circuit 12. The power cutoff drive circuit 12 sends a cutoff signal to the terminal P6,
The interrupting relay 5 connected to the terminal P6 is activated, and the relay contact 5a is opened only during the interrupting time t1. By opening the relay contact 5a, the power supply from the constant voltage power supply 3 is cut off for a cutoff time t1, the reception operation of the fire receiving circuit 4 is restored, and the relay contact 4a is opened. Even if the power supply is cut off, the fire detector 2 mechanically continues to detect fire if there is a fire, and after the cutoff time t1 has elapsed, the relay contact 5
Since the fire signal is sent out again when the terminal a is closed, the fire reception circuit 4 is reactivated, and the relay contact 4a is closed to send out the fire signal to the terminal P4. On the other hand, after receiving the cutoff signal from the power cutoff driving circuit 12 and passing the cutoff time t1, the reception frame time setting circuit 13 outputs a signal only for a predetermined reception frame time t5.
The fire detection drive circuit 15 is operated by the AND output of t5 and the fire signal from the terminal P4. The fire detection drive circuit 15 latches the detection operation and continuously sends out a detection signal to the alarm unit 7 via the terminal P5 to maintain the alarm display. Incidentally, when the recovery switch 9 is operated, the detection operation of the fire detection drive circuit 15 is turned off, and the alarm display of the alarm section 7 is restored. In this way, when the heat sensor detects a fire, the alarm is issued by shutting down and restoring once without accumulating heat.

Next, the operation when the fire detector 2, which is an ionization type sensor, detects a fire will be explained with reference to the timing chart in FIG. This ionization type sensor has a certain amount of recovery time after the power is cut off and then turned on again before returning to the fire detection state, and there is a higher possibility of non-fire alarms compared to heat detectors. The storage and reception process, which is revealed by the operation of , is performed.

When the fire receiving circuit 4 receives the first fire signal from the fire detector 2, it closes the relay contact 4a and sends the fire signal to the delay circuit 11 via the terminal P4. The power cutoff drive circuit 12 is the delay circuit 11
The interrupting relay 5 is operated based on the signal output from the relay, and the relay contact 5a is opened only for the interrupting time t1. When the power supply to the fire detector 2 is cut off by opening the relay contact 5a, the fire detection state is released, and even if the power is supplied again, the recovery time t2
Therefore, the second fire signal is output after the predetermined recovery time t2 has elapsed without immediately detecting the fire. Therefore, since the fire signal is sent out after the reception time t5, the AND circuit 14 remains off. On the other hand, the timer circuit 17 inputs the first signal from the fire detector 2 and operates as a timer, and after the prohibition time (accumulation time) t3 elapses, it outputs the notification signal to the AND circuit 16 for the notification time t4. , during this prohibition time t3, every time a fire signal is obtained from the fire detector 2, the cutoff relay 5 is operated,
The power supply to the fire detector 2 is repeatedly cut off for a time t1. Then, when a fire signal is obtained from the fire detector 2 within the notification time t4 after the prohibition time t3 has elapsed, the AND circuit outputs an AND output to the fire detection drive circuit 15. The fire detection drive circuit 15 latches the detection operation and continuously sends the detection signal to the alarm unit 7 to display an alarm. Of course, when the recovery switch 9 is operated, the fire detection drive circuit 15 is turned off, and the alarm display of the alarm section 7 is restored. In this way, like an ionization smoke detector, after power is resupplied,
Sensors that require a recovery time t2 are now given an accumulation time. In other words, the storage function is provided only for sensors that generate many non-fire alarms, such as ionization smoke detectors.

Next, the case of conducting an operation test will be explained with reference to the timing chart of FIG. When performing an operation test, first operate the test switch 8 to send a test signal to the latch release unit 18 via the terminal P3.
Send to. The latch release unit 18 outputs a release signal to the timer circuit 17 and the fire detection drive circuit 15,
The timer circuit 17 is prohibited from sending a notification signal (accumulation is released) and the latch function of the fire detection drive circuit 15 is released. In this state, heat, smoke, etc. are temporarily applied manually or automatically to each fire detector installed at the site. When a fire signal from the operation test is obtained from the fire detector 2, the AND circuit 19 outputs an AND output of the release signal from the latch release unit 18 and the fire signal from the operation test, and operates the fire detection drive circuit 15. let When the fire detection drive circuit 15 is turned on, the alarm unit 7 is caused to display that a fire signal has been received by the operation test.

On the other hand, after the delay circuit 11 inputs the fire signal from the operation test and the delay time t0 has elapsed, the cutoff relay 5
is turned on for a cutoff time t1, and the power supply to the fire receiving circuit 4 and the fire detector that sent out the fire signal by the operation test is cut off, and the fire detection operation is cut off for the time t1.
It will be restored for a while. The AND circuit 19 turns off the detection operation of the fire detection drive circuit 15 and restores the alarm display of the alarm section 7 since a fire signal cannot be obtained from the test from the terminal P4.

In this embodiment, an ionization type smoke detector is provided with a storage function, but the present invention can also be applied to a fire alarm receiver in which a fire detector such as a photoelectric smoke detector or a heat detector is provided with a storage function. .

(Effects of the invention) As explained above, according to the invention, after receiving the fire signal (first alarm) from the fire detector and elapsed after the predetermined prohibition time (accumulation time), the alarm is only given for the predetermined alarm time. a timer circuit that outputs a signal; a power cutoff unit that inputs a fire signal and, after a predetermined time, cuts off power supply to the fire detector within the prohibited time to restore the fire detector; A fire detection drive circuit that performs a detection operation and latches the detection operation based on the AND output of the alarm signal (timer output) and the fire signal (second report) after the power supply is cut off by the power cutoff section, and the fire detection drive circuit. In a storage type fire alarm receiver equipped with an alarm unit that displays an alarm based on a detection signal from Further, the timer output (accumulation output) of the timer circuit is prohibited by a release signal from the latch release part, and the fire detection drive circuit is operated in accordance with the AND output of the release signal and the fire signal from the test. By doing this, it is possible to immediately receive pseudo fire signals from both heat detectors and ionization type detectors without providing a special accumulation function release means such as a release switch, and without increasing the equipment cost of the fire alarm receiver. Test work for operation tests can be shortened. In addition, by activating the power cutoff unit at the same time as the test fire signal is received, the alarm display operation of the fire alarm receiver is automatically restored each time a test fire signal is received, without having to operate a recovery switch. The effect is that the test work can be carried out efficiently.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing the main parts of the present invention, Fig. 2 is an overall configuration diagram showing an embodiment of the invention, Fig. 3 is a flowchart showing the detection operation based on a fire signal from a heat sensor, FIG. 4 is a flowchart showing the detection operation based on the fire signal from the ionization type sensor, and FIG. 5 is a foot chart showing the test operation during the test. 1...Fire alarm receiver, 2...Fire detector,
3, 10...constant voltage power supply, 4...fire receiving circuit,
5... Relay, 6... Accumulation control section, 7... Alarm section, 8... Test switch, 9... Recovery switch,
L1, L2... power supply signal line, 11... delay circuit, 12... power cutoff drive circuit, 13... reception frame time setting circuit, 14, 16, 19... AND circuit, 15... fire detection drive circuit , 17...Timer circuit, 18...Latch release section, P1, P2, P
3, P4, P5, P6...terminals.

Claims (1)

[Scope of Claim for Utility Model Registration] A timer circuit that receives a fire signal from a fire detector and outputs an alarm signal only for a predetermined alarm time after a predetermined prohibition time has elapsed, and a timer circuit that outputs an alarm signal only for a predetermined alarm time after receiving a fire signal from a fire detector, and after a predetermined time after inputting the fire signal. a power cutoff section that cuts off the power supply to the fire detector for a predetermined period of time within the prohibited time to restore the fire detector; and an alarm signal from the timer circuit and a fire signal after the power supply cutoff is cut off by the power cutoff section. In a storage type fire alarm receiver equipped with a fire detection drive circuit that performs a detection operation based on an AND output of and latches the detection operation, and an alarm section that displays an alarm based on a detection signal from the fire detection drive circuit. , a test switch that is operated during the operation test, and a touch release that outputs a release signal based on the test signal output by the operation of the test switch to release the latch function of the fire detection drive circuit and prohibit the timer output of the timer circuit. and an AND circuit that outputs an AND output from the release signal and a fire signal caused by a test alarm of the fire detector to the fire detection drive circuit to display an alarm, and when the test switch is operated, the fire alarm is detected. By releasing the latch function of the detection drive circuit, the alarm is displayed only when a fire signal is input due to a test alarm.
1. A storage type fire alarm receiver, characterized in that the alarm display is restored by restoring the fire detector by operating the power cutoff section after a predetermined period of time has elapsed after a fire signal is input.