JPS58195995A - Receiver for fire alarm equipment - 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 is intended to prevent false alarms from being issued due to the reception of non-fire alarms, and to identify the areas where the detectors where non-fire alarms are installed can be identified. The present invention relates to a receiving device for disaster notification equipment, which is equipped with separate receiving circuits for displaying areas to be reported and receiving circuits for outputting alarms.

Conventionally, this type of fire alarm equipment includes, for example, the one shown in Figure @1.

In FIG. 1, l is a receiving device.
A pair of power signal lines 4 and 4' as sensor lines are led out toward the caution area, and this power signal @1
．． Smoke detector 2 m @ 2 b * = · is connected between 1', smoke detector 2a, 2b, ... is connected to smoke detector 2
As shown in FIG. 1A, there are 4 ionization type or photoelectric type smoke sensing parts that output an output when the inflowing smoke concentration reaches a predetermined value to guide the thyristor 3. Due to continuity, a signal is generated between the lj source signal @1 and 1',
The alarm is outputted to the receiving device 1 at the same time as the alarm indicator light 5 is turned on.

-a, the receiving device 1 has a current detection circuit 6 equipped with a transistor TR1 and a resistor R, which is turned on by an alarm current caused by the detection of a fire in one of the smoke detectors 2m, 2b, . , transistor TR, energizes the reception relay Lt-, and relay contact 1. Self-retains by closing and acts as a relay contact! , the district indicator light (not shown) lights up when , and relay contact 1 . The relay Ft is energized by the closing of the contact fi, and the bell rings by the closing of the contact fi. It also has a 7Fi power supply and an 8Vi recovery switch.

By the way, in such conventional fire alarm equipment,
Smoke detectors 2a installed in restricted areas.

2 b e...(・) Smoke or dust from causes other than the fire at a concentration equivalent to that at the time of a fire may enter the smoke chamber, or small insects may enter the smoke detection chamber of the detector, or In some cases, the smoke detector may go off and generate a non-fire alarm due to external noise caused by the signal line Klj, even though there is no fire. It operates in the same way as the alarm bell, which rings and pulls the alarm bells all at once, and activates the direct sales communication equipment to the fire department to notify the fire department.

Therefore, when non-fire alarms are issued every time, the user has to operate the bell stop switch installed in the receiving device IK to cancel the ringing of the bell or disable the means of contacting the fire department. The electric gap in the device 10 was cut off and the fire monitoring function was stopped, causing the alarm bell to not ring or the fire department to be automatically notified in the event of a fire, resulting in a delay in the discovery of the fire. This has led to a situation where a large fire breaks out and many lives are lost.

The present invention has been developed in view of these conventional problems, and the cause of non-fire alarms is on the detector side, and moreover, non-fire alarms are more likely to occur in proportion to the detection sensitivity of the sensor. Furthermore, focusing on the fact that the occurrence of non-fire alarms is extremely uniform,
When the first alarm is issued from a fire detector, the warning area where the alarm detector is installed is displayed and the area where the alarm was issued can be confirmed later without ringing an alarm bell or notifying the outside. The area display is maintained, and after receiving this first alarm, the supply to the fire detector is temporarily cut off for 1 it, the alarm detector is forcibly restored, and after this restoration, the alarm is issued, received, and restored again. When a series of operations is repeated at least twice in one hour, an alarm bell is output and the alarm bell is sounded, and in this way, the district display and the bell alarm are classified into the receiving device (by VC). As a result, it was later confirmed that in response to a temporary non-fire alarm, alarm bells were not rung all at once and the fire department was not automatically alerted, and it was later confirmed that non-fire alarms were received even when the equipment was unmanned. In the case of a fire alarm, it is possible to reliably issue an audible alarm by simultaneously setting alarm bells 1 a certain time after the first alarm, or to automatically notify the fire department.In response to a non-fire alarm, the bell can be stopped or the power supply can be shut off. The purpose of the present invention is to provide a receiving device for fire alarm equipment that does not have to be used.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 2 is a circuit diagram showing an embodiment of the present invention.

First, to explain the configuration, a pair of power supply/signal lines I are connected from the receiving device 10 to the required warning area.

1' is pulled out, and this power supply declination * i e
For this power supply signal 91.1', where a number of fire detectors are connected in the same manner as in Fig. 1,
The recovery switch 8 is connected to the power supply 7 installed in the main unit 1.4
Power is supplied to the controller, and the signal ml@VL
A current detection circuit 6 consisting of a transistor 1 and a resistor R is provided.

In actual equipment, a plurality of power supply signal lines are led out from the receiving device IO, and a current detection circuit 6 is provided for each signal line.

The receiver relay Ln (n=3゜2,...
(integer representing the number of lines) is connected (・ru. This receiving relay Ln has a relay contact In for self-holding, a relay contact In for lighting a district indicator light (not shown),
has.

In addition, the collector of the transistor of the current detection circuit 6 is
It is connected to the load resistor R through the diode, and the resistor R1
The output between the terminals of is connected to a differentiating circuit consisting of resistor R6 and capacitor C1, and the differential pulse output from capacitor C0 is connected to resistor R@s R? The voltage is divided by the transistor TI (
, is configured to be turned on for a predetermined period of time.

The transistors T~ are connected so as to short-circuit the power signal lines 1 and 1' from the receiving device 10 so as to temporarily cut off the power supply to the fire detector.

Historically, the transistor TR in the current detection circuit 6.

The collector of is connected to a capacitor VII[ol having a resistor R11 and capacitors C and f, so that when the transistor Titl is turned on, the capacitor C1 is photoelectrically charged.

The nine resistors R31 connected in parallel to the capacitor C2 form a discharge circuit for the capacitor C7, and the discharge time constant is determined by the value of the resistance ratio □.

The voltage of the converter f+c, o4 is connected to the positive input terminal of the comparator 12, and the Ik quasi-skin pressure Vr divided by the resistors R, R1, 0 is set to the negative input terminal of the comparator 12. , the comparator 12 is configured to produce a torque output when the optical voltage of the capacitor C1 reaches FEVr.

The output of this comparator 12 is connected to the base of the transistor T through the resistor R11t, and the transistor T connects the relay F as a collector load. It is equipped with a relay contact f and a relay contact for ringing an alarm bell.

In the embodiment shown in FIG. 2, the receiver 10 is extracted once, but the transistors TR are similarly provided for other lines.

The collector of is connected in parallel between the resistor R1, and the capacitor (,') through a diode, and the signal 11ill is connected in parallel to the collector side of the transistor 1', tt, through a diode tt. I come to do it.

Next, the present invention will be explained in detail with reference to the Ig waveform diagram in FIG.

First, according to the steady monitoring report, the current flowing from the power supply 7 through the rQ old switch 8 and the resistor R of the current detection circuit 6 during the 1.1' In this state, the transistor TR0 of the current detection circuit 1 6 maintains the off state @4.

Next, if any one of the multiple fire detectors connected between S source and eccentric rice 1 and l' detects all the fires and issues an alarm, the fire detector that triggered the alarm will be FG that can also be used as a T source via
A small alarm current of, for example, 40 mA is provided between lines i and l' in the fire detector (t1), and the alarm state is maintained by conduction of a thyristor or the like.

This alarm current detects the 11i current [resistance of circuit 6] Ll
The voltage generated across the resistance ratio is 2. The voltage is divided by R3, the transistor Tl (, turns on in response to the base voltage, and the receiver 1
Re-relay Ln is activated. When this reception relay Ln is energized, its relay contact jfil closes, which makes the firefly relay Ln self-holding, and the relay contact 1n2 closes, making it compatible with W command area VC where alarm detectors are installed. The district indicator light will remain lit.

History II (Transistor T of the 4-flow horizontal output circuit 6 is turned on) Power is supplied to the differential circuit consisting of capacitors C3, 1, and C3 through the transistor TR, and the rise of the power supply voltage -\ is A differential pulse with a pulse width determined by the time constant of resistor R6 and capacitor CI is generated, and resistor R6゜Hl
The transistor TR is turned on during the period between T and UP when the voltage is divided by f and the transistor TR reaches its cutoff. By turning on this transistor TR, the power supply 1i! ”：
#el/' is short-circuited for a certain period of time T, and the power supply to the alarm sensor is cut off to forcefully restore the alarm.

On the other hand, due to the current flowing through the current detection circuit for 6 minutes due to the turning on of the transistor 1, the transistor T) is also turned on for a certain period of time T.
The capacitor C1 is photoconductive via the capacitor C1. Fixed time T
+ft11! Then, the transistor T)l, , returns to off, and in response, the transistor T1 of the current detection circuit 6 turns off.
゛The river is also turned off, and the kugen dual use denominator is again -! , l', power is supplied to the fire detector that has triggered the alarm.

At this time, the fire detector indicates that there is a fire and the situation is critical.
Will the fire start again after a certain period of time when the fire detector goes off after the power is resupplied? Detects and issues an alarm, and receives it in the same way as the first report] Detects and issues a current detection circuit 6
The transistor 1'H is turned on, and during the on-time of the transistor 1', which is determined by the differential pulse width, the signal is again transmitted to the output voltage C11 via the resistor R1.

Of course, when the transistor T)tt is turned on, the signal lines 1 and l' are short-circuited even if the second occurrence occurs, causing a fire. The system is disconnected and the alarm detector is forcibly restored.

Here, capacitor C! The reference voltage Vrf of the comparator 12 for determining the photoelectric voltage of the alarm is issued again after the first alarm is received and the alarm sensor is restored.

If we set the reference voltage VrVC corresponding to the photoelectric voltage of the capacitor C1 when the series of operations of reception and recovery are repeated twice (. , the output e (↓ of the capacitor C) reaches the reference voltage VrfC of the capacitor C2 and the comparator 12, and the output of the comparator 12 is at H level and is transferred to the transistor TR, via the tit resistor R11. t is turned on and relay F is energized.

By energizing relay F, its relay contact 'I#'t*f,
are closed, the relay contacts f maintain the relay completely, automatic notification is made to the fire department by the relay contacts f, and the relay contacts also ring the bells all at once.

Next, smoke or foreign noise caused by factors other than fire (
↓Assuming that a non-fire alarm is generated by the fire detector, the transistor T) of the current detection circuit 6 of the receiver 1J is turned on by the current generated by the non-fire alarm, and the relay Ln is turned on.
K is energized, self-maintained by the relay contact jnl, and the area display illusion shown in the membrane warning area 1 of the fire detector in which a non-fire has occurred is lit and maintained by the +ru contact jn2. K, h transistor TI-L.

Due to the differential pulse obtained from the resistor R6 and the capacitor C1, the transistor TR is turned on for a certain period of time by the on-VC of
Turn on during f-C Ichigen combined Gogo#! 1.1', and non-fire alarm k (alarm is issued, the power supply to the fire detector is disconnected and resisted at the same time) Lll is connected to the capacitor C, 2-' If the photoelectric current is applied for a period of 1゛. However, since it is non-fire alarm sensitive, it is impossible for the alarm IP, key 1 and nose to fire again after alarm detection is restored by continuous output i of %4 source supply. Therefore, the light wit pressure of the capacitor C6 is discharged through the resistor R1, and the conoparator 12 does not generate an H level output, so that automatic notification to the bulletin board or fire department 11 etc. is not made by the activation of the relay F. Don't do it (・.

However, since the relay Ln is in a self-holding state due to the reception of a non-fire alarm, the area indicator light indicating the alert area of the telepathy sensor that generates the non-fire alarm remains lit. The reception of B7Joi is used for unmanned fire alarm equipment at night etc. (Even if the fire detector is installed in a non-fire alarm area by checking the area display of the receiving device 10 later) If you know whether a fire has emitted, and if non-fire alarms are occurring frequently, you can easily check the fire detector inspection.

In the above embodiment, after receiving the first alarm and restoring the alarm sensor, the operations of re-issue, receiving and restoring the alarm are repeated twice to ring the alarm bell at 9 o'clock. (
- However, the alarm bell may be set to ring when this series of operations of issuing, receiving, and restoring the alarm is repeated two or more times.

Furthermore, in the above embodiment, the number of repetitions of a series of operations of issuing, receiving, and restoring is detected in an analog manner by repeatedly charging a capacitor. A digital circuit may be used to count using a counter or the like and set an alarm bell to ring when the count 1 reaches a predetermined value.

As explained above, according to the present invention, when the first alarm from a fire detector is issued, the alarm bell is not rung or the outside is notified. After receiving this first report, the power supply to alarm detector-1 is temporarily cut off, and the alarm detector is forcibly used. When the series of 41+ degree alarm reception and recovery operations are repeated at least twice within a certain period of time, an output is output to ring an alarm bell or send money to the outside, so that temporary For non-fire alarms, alarm bells are not rung all at once and automatic notifications are not made to the fire department, etc., and alarm detectors are installed [indicating the alert area] so that the alarm can be detected after a non-fire alarm has been reported. Solved the problem of keeping only the district indicator light on and turning off the alarm bell even by non-fire alarms by turning on and turning off the alarm bell and turning off the power of the receiving device as a result. On the other hand, when a fire detector is activated due to a fire, the series of operations including activation, reception, and recovery are repeated multiple times during the -WFI''F period, and an alarm is output just in case. As the bell rings all at once @Friday, the same alarm capability as the conventional fire alarm system with storage-type fire detectors has been achieved, and as a result, the reception It is possible to prevent the device from being artificially rendered incapable of issuing a fire alarm, and to achieve the effect that it is possible to provide a highly sensitive fire alarm system.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an example of a conventional fire alarm system, Fig. 2 is a circuit diagram showing an embodiment of the present invention, and Fig. 3 shows various parts of the embodiment of Fig. 2 when a fire is detected. Signal waveform 1
It is a time chart figure shown. ]0... Receiving device 6... Current detection circuit 7
...Power supply 8...Recovery switch 12.
...Comparator Ln, F...Relay j
nl, jn, , f, z f,... Relay contact TR, ~,... Transistor R3-7-R,, I(l
, ~R2,...Resistance C1s c,...Capacitor patent applicant Susumu Takeuchi, patent attorney representing Hochiki Co., Ltd.

Claims (1)

[Scope of Claims] A receiving circuit for displaying a warning area, which once receives an alarm from a fire detector, maintains reception of the alarm and displays a warning area where the alarm detector is installed; After the alarm reception circuit receives the alarm, the power supply to the alarm detector is temporarily interrupted and restored, and the series of operations of issuing the alarm again, receiving the alarm, and restoring the alarm are repeated at least twice within a certain period of time. 1. A receiving device for a fire alarm system, which is provided with an alarm output receiving circuit that outputs an output when a signal is returned to trigger an audible alarm, and has a feature that an alarm display and a fire alarm are separated by each of the receiving circuits.