JPS58165190A - Sound control circuit for 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 The present invention comprises a plurality of district relays activated by an O sensing signal related to an acoustic control circuit of a fire alarm system, and a fire relay activated when any of the district relays is activated. A contact point of the fire relay is configured to ring an alarm bell. In such equipment, when performing functional tests of fire detectors and fire alarm systems, a switch for stopping the bell is connected in series with the bell circuit to avoid unnecessary confusion caused by ringing of the alarm bell. Insert it into
The switch may be opened for maintenance and inspection. In this case, if you forget to close the recorder again after maintenance and inspection, there is a serious drawback that the bell will not ring in the event of a fire. In order to eliminate this drawback, we installed a bell stop relay that is activated by the trigger of the bell stop button, connected the normally closed contact of the relay in series to the bell circuit, and set up a timer that operates after a certain period of time when the bell stop button is pressed. A bell control circuit is known in which a meter contact is connected in parallel to a normally closed contact of the bell stop relay. Even in this case, ringing of the bell is not guaranteed if a fire occurs within a certain period of time.

Further, a flip-flop is set by pressing a bell stop button (non-locking), and the output of the flip-flop operates a bell stop relay, and subsequent operation of any district relay causes the relay to be activated. A control circuit is also known in which a reset signal is sent to the reset terminal of the flip-flop through a contact and a capacitor, thereby resetting the flip-flop and restoring the bell stop relay to ring the bell. However, in this case, it is not possible to stop the ringing of the bell in advance by using a test number such as a sensor, and once the bell has rung, it can only be stopped or stopped by pressing the bell stop button. This may cause unnecessary confusion. Further, even if one sensor is turned off, the bell immediately rings, which similarly causes unnecessary confusion.

The purpose of the present invention is to solve the above-mentioned conventional drawbacks, and to make it possible to arbitrarily stop the sound of an alarm bell, etc. after the sound circuit rings, or to prevent the sound of an alarm bell, etc. from being generated in advance by paying a membership fee. a] To provide a sound control circuit for a fire alarm device which is capable of generating sound even when the sound is stopped, depending on the occurrence of a mold fire.

The sound system of the present invention #41'ft, wrinkles, consists of an alarm wire wired to each of a plurality of warning districts, a district circuit operated by a fire detection signal sent to the warning wire, and any district circuit. A fire alarm circuit is operated by the output of the fire alarm (b), an acoustic circuit that rings an alarm bell etc. by the gravity signal of the fire alarm (b) path, and a normally closed contact is connected in series to the acoustic circuit, and the acoustic stop button is pressed. The fire alarm device is characterized in that the fire alarm device is equipped with a sound stop circuit that is activated by a motion, and further includes means for restoring the sound stop circuit when two or more of the district circuits are activated.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

That is, between the alarm wires L1 to Ln wired in each warning area and the positive power supply +E, there are
KL is connected, and the corresponding district relay is activated by a fire detection signal from a sensor connected to the alarm line (earth of the alarm line, loop of the common line C&', etc.). The meter contacts rt1' to rL of each district relay are connected in parallel to the fire relay F, and connected in series to the power source KL. In this embodiment, district relay 1 (L, , contact point r
11 and a normally closed contact rt, which will be described later, constitute one district circuit. Therefore, when any of the district relays is activated, the fire relay 14F''' is activated and its contact rf' is closed. Electricity y1. Sends *- and rings the bell.

The fire relay b' and contact rf constitute a fire alarm circuit.

On the other hand, when the bell stop button is pressed, the contact rJ? When a positive voltage is applied to the set terminal S of the flip-flop FF via ), the flip-flop FF is set, the output terminal Q becomes high level, and the bell stop relay kLB operates. When the normally closed contact rb opens due to the operation of the bell stop relay kL8, the bell circuit is cut off and the ringing of the bell is stopped.
You can also leave d open. The bell stop button is generally an acoustic stop button, and the bell stop relay RB and the normally closed contact rb constitute an acoustic stop circuit. The bell circuit is an audio circuit for a buzzer or tape recorder, etc. rl'
A series connection circuit of rL and a resistor R is connected between the positive and negative power supplies, and Zener diodes Z1 to Z7 are connected in parallel to each contact rt: to rl, respectively.

The connection point between the resistor R and the Zener diode Z is connected to the voltage of the comparator CA, and a constant reference voltage 8 is applied to the voltage of the comparator CA. The reference voltage can be easily obtained by dividing the power supply voltage using resistors R, , R,. Comparator G
The output of A is connected to the reset terminal R of the flip-flop FF via a capacitor C11. The Zener voltages of the Zener diodes Z, , Z, are smaller than the reference voltage ■R, and the sum of both Zener voltages is larger than the reference voltage vR. However, for example, the Zener voltage of the Zener diode Z is higher than the reference voltage vR. Now, assuming that the important fire detection signal is input to the alarm line L7, the alarm line Ln is manually input and the next fire detection signal is sent to the district relay KL.

When activated, the Zener voltage of the Zener diode ZrL is applied to the voltage of the comparator CA due to the release of the contact rl-, and the comparator CA is inverted. The inversion of the output signal of the comparator CA is transmitted to the reset input kL of the flip-flop FF via the capacitor (,), and the flip-flop F'F is reset. The bell rings because it closes.

L,? ! L, is 1, $@IJ L/-KL, is 1
Tag 11rl: Open friend and 1st case is Zener diode Z
, but since the Zener voltage is lower than the reference voltage 1[VR, the comparator CA is not inverted.

The same is true when the district relay RL operates. Therefore, the bell stop button is pressed in advance to set the flip-flop FF, and then the IF signal IML's is activated.

When testing a fire detector connected to L3, etc., the operation can be confirmed by turning on a lamp (not shown), etc.
However, it has the effect of not causing confusion by ringing the bell.On the other hand, in the event of a fire, the alarm line
When fire detection No. 43 is sent from LJ and LJ, both contacts rL; and r l'2 open, so Zener diode 2. and 2. The sum of the Zener voltages inverts the comparator CA and resets the flip-flop F), causing the alarm bell to sound. Therefore, for example, if the alarm wires are wired along the same route and the fire detectors are placed adjacent to each other, the alarm bell will ring in the event of a fire. In such a case, even if one sensor detects cigarette smoke and generates a false fire signal, the alarm bell will not ring, and if both sensors detect an actual fire, the alarm bell will not ring. It also has the effect of causing the alarm bell to ring. In other words, this has the effect of preventing false alarms from occurring.

It would be even more effective if sensors of different oak species were installed together instead of sensors of the same species. Since the Zener voltages of the Zener diodes Zl to Zn can be set arbitrarily, there is little risk of false detection in different ways, and for important areas, one sensor can be activated to instantly illuminate! It is possible to ring the IT bell and ring the bell when a sensing signal is sent to the two Fi alarm wires in another area. If the bell stop button is not pressed, the bell will of course ring immediately when a sensing signal is sent to any V# signal line.

In this embodiment, the function is to stop the ringing bell by pressing the bell stop button, or to prevent the bell from ringing in advance. Depending on the occurrence or detection signals from two or more alarm wires, the bell can be sounded.
This has the effect that unnecessary confusion will not be caused by the ringing of the bell due to examinations, etc., and that the alarm ringing of an actual fire will not be lost due to forgetting to stop the bell. Furthermore, by considering the arrangement of sensors, etc., it is possible to prevent false alarms from occurring.

FIG. 2 is a block diagram showing an s1!2 embodiment of the present invention. That is, the sensing signal of each alarm wire.

Each time a sensing signal is input, the computer CPU adds 1 to the fire count value stored in the built-in memory, and outputs a fire display signal to display the necessary fire display. It is configured to output a re-sounding pulse when the fire number count exceeds the number of fires, and to set the number of fires to 7 rigs. The flip-flop F'F is set when the bell stop button is pressed and the contact rz closes, and the bell stop relay RB is activated and the contact rbt opens to stop the bell ringing, and when a predetermined number of detections is detected, the flip-flop F'F is set. The bell rings again due to the signal] The same thing as above. If the initialization routine program of the computer CPU indicates the number of fires stored in the memory by pressing the bell stop button, the bell will ring again in the same way even if the bell stop button is pressed the previous time. can.

Further, in the case where each alarm line is weighted, a weighting coefficient α may be added to the fire count value in the memory depending on the sensed signal from the weighted alarm line. The count value for generating the re-ringing pulse, the weighting coefficient, etc. can be arbitrarily set by a program, and can be easily changed, providing great flexibility, and making it possible to simplify the hardware part. In this case, the "controlling means for generating a resounding pulse when the number of human input signals reaches a predetermined number" is constituted by the computer CPU.

The above-mentioned control means (1), for example, causes a normal counter to count the sensing signal from the alarm line, and applies an i-force pulse depending on the -W count number to reset the flip-flop FF (↓); 1□ Can be configured. Further, the counter can be easily reset and initialized by pressing the bell stop button.

As described above, in the present invention, the sound stop circuit is operated by the output of the flip-flop, which is set by pressing the sound stop button, and is reset when a certain number of areas or more are activated.

Since the normally closed contact of the acoustic stop circuit is inserted in series with the acoustic circuit, the ringing of the acoustic circuit such as a fire alarm bell can be stopped in advance or at any time after ringing by pressing the acoustic stop button. It is possible to play the sound again under certain conditions even after the sound has stopped. Therefore, it is possible to prevent confusion caused by unnecessary generation of the sound 41 during tests, etc.

This has the effect of preventing bell ringing due to false detection or the like. Furthermore, since the structure is such that the sound can be re-sounded under certain conditions even after pressing the sound stop button, the fire alarm will not be lost due to forgetting to restore the sound stop. Furthermore, it is possible to assign weights to each warning line, allowing for rational and appropriate fire supervision.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention. FIG. 2 is a block diagram showing a second embodiment of the invention. In the figure, L1 to L,...alarm line, C...common line, B,...bell wire terminal, KL1 to I(, Lr, :...
District relay, RF...Fire relay, Re...Bell stop relay, FF...Flip-flop% CA...
Comparator s RI R1 * Le...Resistance %rl-
r transport, r11 to τ transport... District relay contacts, Z1 to Z
rL... Zener diode, rf... Contact of fire relay, rh... Normally closed contact of bell stop relay, r,?
...Bell stop button contact s"1...Capacitor,
CPLI...computer. Applicant Nittan Co., Ltd. Agent Patent Attorney Sumi 1) So Toshi (and 2 others) Figure 1 Figure 2

Claims (1)

[Claims] (1) Warning lines wired to each of a plurality of warning areas;
A district circuit that operates based on the fire detection signal sent to the alarm line, a fire alarm circuit that operates based on the output of any of the district circuits, and an acoustic circuit that rings an alarm bell or the like based on the output signal of the fire alarm circuit. and an acoustic stop circuit that connects a normally closed contact in series to the acoustic circuit and operates when the acoustic stop button is pressed, when two or more of the district circuits operate and the A bell control circuit for a fire alarm device, characterized in that it is provided with means (tm) for restoring an acoustic stop circuit. (2. In the acoustic control circuit of the fire alarm device according to claim 1, a Zener diode is connected in parallel to the normally closed contact of each district circuit of Tsumugi, and the normally closed contact of the district circuit and the Zener diode are connected in parallel. A comparator that applies voltage via a resistor to a series connection (b) path in which a plurality of parallel connection circuits are connected in series, and compares the voltage with a reference voltage at both ends of the series connection circuit, and the sound stop button. and a flip-flop that is set by the pressing of the t-tm and reset by the output signal of the comparator, and the sound stop circuit is operated by the output of the flip-flop. (3) Claims The sound control circuit of the fire alarm device according to item 1, further comprising a control means for generating a re-sound pulse when the number of human input signals reaches a predetermined number.The sound stop circuit is restored by the re-sound pulse outputted from the liM means. (4) The sound control circuit for a fire alarm device according to claim 3, characterized in that the control means is constituted by a counter. (5) Patent The sound control circuit for a fire alarm device according to claim 3 or 4, wherein the controller [ is initialized by pressing the sound stop button.