JP2562203B2 - Storage fire receiver - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a storage-type fire receiver that issues a fire alarm when a fire signal continues to be received for a predetermined time or longer.

[Prior Art] In the conventional storage-type fire receiver, the fire reception circuit that detects the alarm current flowing by the fire detection by the detector for each detector line and the power supply to all the detector lines are cut off. There is a recovery switch circuit that recovers the alarm detector when a fire is received by a specific sensor line.
The recovery switch circuit is activated to temporarily shut off the power supply to all lines to restore the alarm sensor, and to issue a fire alarm when a fire is received again within the specified time after restoration. .

[Problems to be Solved by the Invention] However, in such a conventional storage-type fire receiver, only one recovery switch circuit for temporarily interrupting the power supply to the reporting line is provided for all lines. Therefore, if a fire signal is received by a specific sensor line, the recovery switch circuit will be activated to temporarily cut off the power supply to all lines. If there is a container, the detector will be restored, and there is a problem that the alarm will be delayed depending on the type of the detector. In addition, since only one timer was provided for all lines to check if a fire signal was received again within a predetermined time after restoration, it is true that multiple line sensors will give false alarms within a certain period of time. There was a problem that it was judged as a fire and an alarm was given.

In order to solve these problems, it has been considered to install a fire detection circuit and a recovery switch circuit for each line, and a timer for each line corresponding to each fire detection circuit, but the receiver circuit configuration However, there is a problem in that the circuit size is increased in accordance with the sensor line, the receiver itself is also increased in size, resulting in an increase in cost and the impracticality.

The present invention has been made in view of the above-mentioned conventional problems, and the storage operation can be performed for each line and the circuit configuration is simple, and the line scale increases even if the number of lines increases. It is an object of the present invention to provide a storage fire receiver that is inexpensive in terms of cost.

[Means for Solving the Problem] In order to achieve this object, in the present invention, a plurality of detector lines are connected to each warning area to which a fire detector is connected,
A storage-type fire receiver which issues a fire alarm when a reception state of a fire-reception signal from any of the sensor lines continues for a predetermined time or longer.
In that case, selection means for sequentially selecting the detector lines; and fire detection means commonly provided for each detector line for detecting the fire signal of the detector lines selected by the selection means;
Restoration means provided in common to each sensor line for shorting the sensor line selected by the selecting means to a low impedance to cut off the power supply to restore only the alarm detector. When a fire detection output is obtained from the fire detection means, the restoration means is operated to restore only the sensor of the reporting line for which the fire detection output is obtained, and within a predetermined time after restoration, the fire detection means restarts And a storage control means for issuing an alarm when a fire detection output from the information line is obtained.

According to claim 2 of the present invention, a selecting means for sequentially selecting the detector lines; a fire provided in common for each detector line for detecting the fire signal of the detector lines selected by the selecting means. Detection means; a recovery means provided for each sensor line, which restores only the reported sensor by cutting off power supply to the sensor line; and when a fire detection output is obtained from the fire detection means, The alarm is activated when the recovery means provided in the alarm line from which the fire detection output is obtained is activated and the fire detection output is again obtained from the same alarm line from the fire detection means within a predetermined time after the recovery. And an alarm means for performing.

[Operation] In the storage-type fire receiver of the present invention having such a configuration, the plurality of sensor lines connected to the receiver are sequentially selected by the selecting means, and the selected sensor line is fired. Since it is connected to the detection means, one for multiple sensor lines
Since two fire detecting means can be provided in common and only one fire detecting means is required regardless of the number of sensor lines, the circuit configuration of the receiver can be greatly simplified and the cost can be reduced. Further, since the storage operation can be performed for each line, reliability can be increased.

Furthermore, since the circuit scale of the receiver is small, there is less circuit failure and reliability is higher than when each sensor line is provided.

[Embodiment] FIG. 1 is a circuit block diagram showing an embodiment of the present invention.

In FIG. 1, reference numeral 1 is a storage-type fire receiver. From the storage-type fire receiver 1, sensor lines 2a, 2b, ...
..A pair of power source / signal lines formed by combining each of the 2n and the common line 3 are drawn out, and the sensor lines 2a to
One or a plurality of fire detectors 4 are connected for each line between 2n and the common line 3, and a terminating resistor 5 for detecting disconnection is connected to the end of the fire detector 4.

Corresponding to the sensor lines 2a to 2n, the storage type fire receiver 1 is commonly connected to the (+) side of the power supply unit (not shown) via the resistor 7 for each line. A common recovery switch 8 for collectively recovering the entire sensor lines 2a to 2n is inserted and connected to the common connection line on the power source side.

Furthermore, the storage-type fire receiver 1 is provided with a selection circuit 9, and the selection circuit 9 corresponds to the number of the sensor lines 2a to 2n and is an analog switch S1, S2, ... Sn.
Equipped with one of the analog switches S1 to Sn for each sensor line
Connected between 2a ~ 2n and resistor 7, and analog switch S1 ~
The other of Sn is commonly connected and taken out. The selection circuit 9 including the analog switches S1 to Sn is controlled by the selection control line 26 from the CPU 12 so that the analog switch S1 is provided at predetermined intervals.
-Sn are sequentially turned on to sequentially select and connect the sensor lines 2a-2n.

The selection output of the selection circuit 9 is input to the detection circuit 10. The detection circuit 10 is connected to the sensor circuit 2a connected by the selection circuit 9.
Fire detection and disconnection detection for any one of 2n. For example, if the power source voltage from the storage-type fire receiver 1 supplied between the sensor lines 2a to 2n and the common line 3 is 24V, the line voltage input to the selection circuit 9 by the terminating resistor 5 is, for example, the power source. The voltage is 24V, which is slightly lower, around 22V. In this state, for example, when the fire detector 4 connected to the detector line 2a is activated and the detector line 2a and the common line 3 are short-circuited to a low impedance, the detector line 2a and the common line 3 in the storage-type fire receiver 1 are short-circuited. The voltage in between drops to about 0 V, and this voltage drop is detected by the detection circuit 10 to generate a fire detection output. On the other hand, regarding disconnection detection, when the sensor line is disconnected, the terminating resistor 5 is disconnected, so the line voltage under normal conditions, such as 22V, increases to 24V due to the disconnection,
This voltage change is detected by the detection circuit 10 to generate a disconnection detection output.

The fire and disconnection detection output of the detection circuit 10 is given to the CPU 12 having a function as storage control means. The CPU 12 has a timer 13 as a storage timer built therein. Timer 13
There are as many detector lines as there are detector lines, and when a fire detection output is obtained, the timer corresponding to that line is activated, the alarm line is restored once, and the fire detection output is output again from the same line at the specified time. It is checked whether it can be obtained. If it is obtained, a fire alarm is activated, and if no fire detection output is obtained from the same line within a predetermined time, it is cleared. In this case, even if a fire detection output is obtained from another line while one timer is operating, the fire alarm is not issued because the timer corresponding to another alarm line only operates.

A fire lamp 18, district lights 20a to 20n, and a disconnection lamp are connected to the CPU 12.

Furthermore, a recovery switch circuit 14 is branched and connected to the ground for the connection line between the selection circuit 9 and the detection circuit 10,
When the recovery switch circuit 14 is turned on by the control of U12, the sensor line selected by the selection circuit 9 is short-circuited to a low impedance to cut off the power supply, and this power supply cutoff connects to the sensor line. The alarm sensor can be restored.

Here, the function of the storage control by the CPU 12 will be explained.
Under the control of the PU 12, the selection circuit 9 is operated to sequentially select the sensor lines 2a to 2n by the operation of the analog switches S1 to Sn, and the detection circuit 10 fires when the specific sensor line is selectively connected. When the detection output is given to the CPU 12, the CPU 12 first stops the selection operation of the selection circuit 9 and locks the selected state of the detector line in which the fire is detected. The CPU 12 outputs a control signal to the recovery switch circuit 14 to turn on / off the recovery switch circuit 14 in the locked state of the selection circuit 9 for the detector line where the fire is detected, thereby lowering the alarmed sensor line. The alarm detector connected to the sensor line that is short-circuited to the impedance and is notified is restored.
After the recovery, the lock of the selected state of the line is released, the selection circuit 9 is activated again, and the fire signal of each line is sequentially detected.

Further, the CPU 12 monitors whether or not the fire detection output from the line being accumulated again is obtained from the detection circuit 10 within a predetermined time, and when the fire detection output is obtained again from the fire detection circuit 10, the fire alarm operation is performed. Will be able to

However, if the fire alarm operation is performed on one sensor line, the storage function is automatically canceled, and if the fire detection output is obtained next time, the immediate fire alarm operation is performed.

In the embodiment shown in FIG. 1, the test switch circuit 16 is connected between the selection circuit 9 and the ground via the pseudo line resistance 5, and the CPU 12 turns on the test switch circuit 16 during the test operation and selects at the same time. By sequentially selecting the sensor lines by the circuit 9, the test fire signal determined by the divided voltage of the resistor 7 and the pseudo line resistor 15 is input to the detection circuit 10 to perform the test operation for each of the sensor lines 2a to 2n. I am able to do it.

Next, the operation of the embodiment of FIG. 1 will be described with reference to the flowchart of FIG.

When the storage fire receiver 1 is turned on to start the reception process, the CPU 12 sends an analog switch S to the selection circuit 9.
Clock control signals etc. that turn on 1 to Sn sequentially are given,
As shown in step S1, the analog lines S1 to Sn provided in the selection circuit 9 are sequentially turned on to scan the sensor lines 2a to 2n.
Are sequentially selected.

When a specific sensor line is selected in step S1, the process proceeds to the next step S2 to check the presence / absence of fire detection. If there is no fire detection, the process returns to step S1 again to select the next sensor line.

In step S2, the detection circuit in the selected state of the specific sensor line
When the fire detection output is obtained from 10, the process proceeds to step S3 to check whether the fire alarm has already been issued. If the fire alarm has already been issued, the accumulation operation and the fire alarm are unnecessary. , Go to step S4
That is, the district lamp corresponding to the selected line is turned on and the process returns to the line sequential selection in step S1.

On the other hand, if it is confirmed in step S3 that the fire alarm has not been issued, the process proceeds to step S5, in which the timer 13 is checked whether or not the line in the selected state is accumulating,
If it is being accumulated, proceed to step S6 to give a fire alarm,
At the same time, the district lights corresponding to the fire 18 and the selected line will be turned on.

On the other hand, if it is confirmed in step S5 that the data is not being accumulated, the process proceeds to step S7, in which the CPU 12 stops the output of the control clock to the selection circuit 9 and locks the sensor line in the selected state. Subsequently, in step S8, the CPU 12 activates the recovery switch circuit 14 to switch it on, and thus the selection line 9
The alerting line connected by the line selection lock of, that is, the line in the selected state is short-circuited to a low impedance via the restoration switch circuit 14, and the alarm sensor is restored by cutting off the power supply to the reporting line. Action is taken.

As shown in step S9, the switch-on state of the recovery switch circuit 14 is performed for a certain time by a timer operation, and after a certain time elapses, the process proceeds to step S10 to return the recovery switch circuit 14 to the off state, thereby detecting the fire. Power will be supplied again to the sensor line for which the operation was performed.

Then, the process proceeds to step S11 to start the timer 13 provided corresponding to each sensor line. Then, the process proceeds to step S12, the locked state during line selection is released, the process returns to step S1 for line sequential selection again, and fire detection of each line is sequentially performed.

At this time, if there is a fire detection output from the detector line again during the time preset in the timer 13, step
Proceed from S5 to step S to issue a fire alarm.

On the other hand, when the fire detection output from the sensor line corresponding to the set time of the timer 13 cannot be obtained, the timer 13 is cleared because it is a false alarm.

In the above embodiment, the timer 13 is provided for each sensor line, but if there are many lines, the CPU
Since it is not so preferable because there is almost no possibility of receiving a fire detection output from all lines even if there is a fire, some timers 13, such as timers corresponding to 5 lines, are provided to detect fires. The timer may be preferentially operated in order from the line from which the output is obtained to perform the accumulation operation. There is no problem in that the accumulation operation is canceled once the fire alarm is issued. Further, in this case, the storage may be canceled when the fifth line is input while the fifth line is being stored.
In addition, a timer 13 is provided for all lines,
In order to reduce the load on U, the process of step S5 may be omitted, and the line selection lock release of step S12 may be performed during the set time of the timer 13 or after the set time has elapsed.

That is, during the set time, the alarm line is in the selected state as it is, so there is no problem even if only one timer 13 is used.

In the embodiment shown in FIG. 1, the analog switches S1 to Sn of the line selection circuit 9 are provided in a one-to-one correspondence with the sensor lines 2a to 2n. Since the number of sensor lines that can be connected is determined by the number, etc., the number of analog switches corresponding to the maximum number of sensor lines that can be connected is provided in the selection circuit 9, and the receiver is set within this maximum number of sensor lines. The number of sensor lines to be actually connected is determined, and if the actual number of sensor lines is less than the maximum number of connectable sensor lines, the remaining number of lines will be left as a spare for expansion.

Of course, when it is necessary to connect more sensor lines than the number of analog switches in the selection circuit 9, the storage fire receiver circuit unit shown in FIG. 1 may be added in units.

FIG. 3 is a circuit block diagram showing another embodiment of the present invention. In the embodiment of FIG. 1, the restoration means is commonly provided in the sensor line. It is characterized in that a recovery means is individually provided for each line.

First, the structure will be described. Instead of the restoration switch circuit 14 provided in FIG. 1, shutoff circuits 22a to 22n are provided as restoration means for each of the sensor lines 2a to 2n, and the shutoff circuits 22a to 22n are operated. The sensor that was reported when the power supply was cut off can be restored for each sensor line.

AND circuits 23a to 23n are provided for the cutoff circuits 22a to 22n, the recovery control line 24 from the CPU 12 is commonly input to the AND circuits 23a to 23n, and the sensor lines 2a to 2n for the selection circuit 9 are also provided. The selection control lines 26a to 26n are individually input for each.

Further, the cutoff control lines 25a to 25n are directly connected from the CPU 12 to the cutoff circuits 22a to 22n.

 The other circuit configuration is the same as that of the embodiment shown in FIG.

The operation of the embodiment shown in FIG. 3 will be described. During steady monitoring, the CPU 10 operates the selection circuit 9 under the control of the selection control lines 26a to 26n and operates the analog switches S1 to Sn to detect the sensor lines 2a to 2n. Are sequentially selected.

When the detection circuit 10 gives a fire detection output to the CPU 12 in a selective connection state of a specific sensor line, for example, the detector line 2a, the CPU 12 first stops the selection operation of the selection circuit 9, and the fire detection output is obtained. Once locked to the selected state of the sensor line 2a.

In this locked state, the analog switch S1 of the selection circuit 9
Since the control signal on the selection control line 26a from the CPU 1 that has turned on is also given to the AND circuit 23a, the AND circuit 23a is in the allowable state.

Next, the CPU 12 outputs a restoration signal through the restoration control line 24 in this state for a predetermined time period during which the sensor can be sufficiently restored. This restoration signal is sent to the cutoff circuit 23a via the AND circuit 23a.
The cutoff circuit for the time when the recovery signal is given to the
22a cuts off the power supply to the sensor line 2a and restores the reporting sensor connected to the reporting sensor circuit 2a.

After recovery, the locked state is released and the selection circuit 9 is restarted.
Fire signal from each detector line in turn, and if a fire detection output from the detector line 2a that is currently accumulating again is obtained within a predetermined time at this time, a fire alarm It will start to operate.

Next, the control operation by the cutoff control lines 25a to 25n from the CPU 12 will be described.

The CPU 12 directly controls the cutoff circuits 22a to 22n in consideration of the current consumption when a plurality of lines are issued. That is, when a predetermined number of lines, for example, 5 lines have already been reported, and a fire detection output from the detector line 2n is obtained on the 6th line, CP
U12 gives fire alarm and at the same time the corresponding disconnection control line 2
The cutoff circuit 22n is operated via 5n to maintain the power supply cutoff state. For this reason, even if the number of reporting lines increases, the power is forcibly placed in the hold state after a fire alarm, so the sensor is triggered due to a drop in the power supply due to an excessive increase in the current consumption of the sensor line. It is possible to solve problems such as the addition of lighting of the information display lamp.

[Effects of the Invention] According to the present invention as described above, since a plurality of sensor lines drawn from a receiver are sequentially selected by the selection unit, the fire detection unit is commonly provided for each sensor line. Since only one fire detecting means is required for a plurality of detector lines, the circuit configuration of the receiver can be greatly simplified.
Since it is sufficient, the circuit scale can be minimized and the cost can be reduced.

In addition, the storage operation can be performed for each line, and the reliability can be improved.

Further, since only one fire detecting means is required for the detector line, there are few circuit failures and the reliability of the fire receiver can be improved.

[Brief description of drawings]

FIG. 1 is a circuit block diagram showing an embodiment of the present invention; FIG. 2 is an operation flow chart showing an accumulation reception operation according to the embodiment of FIG. 1; and FIG. 3 is another embodiment of the present invention. It is the circuit block diagram shown. 1: Accumulation type fire receiver 2a to 2n: Detector line 3: Common line 4: Fire detector 5: Termination resistor 7,15: Resistor 8: Common recovery switch 9: Selection circuit 10: Detection circuit 12: CPU (storage Control means) 13: Timer 14: Recovery switch circuit 16: Test switch circuit 18: Fire light 20a to 20n: District light 21: Disconnection light 22a to 22n: Breaking circuit 23a to 23n: AND circuit 24: Recovery control line 25a to 25n : Cutoff control line 26a to 26n: Select control line

Claims (2)

(57) [Claims] 1. A storage-type fire in which a plurality of sensor lines are connected for each warning area to which a fire detector is connected and a fire alarm is issued when a fire signal is received from any of the sensor lines for a predetermined time or longer. A selection means for sequentially selecting the sensor lines in the receiver; a fire detection means provided in common to each of the detector lines for detecting a fire signal of the detector lines selected by the selection means; Restoring means provided in common for each sensor line to short-circuit the sensor line selected by the selecting means to a low impedance to cut off the power supply and restore only the alarm detector. When a fire detection output is obtained, the recovery means is operated to restore only the sensor of the reporting line for which the fire detection output was obtained, and the fire detection means again issues the notification within a predetermined time after restoration. From the line A storage-type fire receiver characterized by comprising: storage control means for issuing an alarm when a fire detection output is obtained; 2. A storage type in which a plurality of sensor lines are connected for each warning area to which a fire detector is connected and a fire alarm is issued when a fire signal is received from any of the sensor lines for a predetermined time or longer. In the fire receiver, selecting means for sequentially selecting the detector lines; and fire detecting means provided in common for each detector line for detecting a fire signal of the detector lines selected by the selecting means; A recovery means provided for each sensor line, which restores only the alarm detector by shutting off the power supply to the sensor line; and when the fire detection output is obtained from the fire detection means, the fire detection output is output. Alarm means for activating the recovery means provided in the obtained alarm line and issuing an alarm when the fire detection output from the same alarm line is again obtained from the fire detection means within a predetermined time after the recovery. And; Storage-type fire receiver, characterized in that.