JPS61198399A - Fire sensor - 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 [Field of Industrial Application] The present invention relates to a fire detector suitable for connection to a $300 fire receiver.

[Prior art] A storage type receiver is a receiver that detects a fire phenomenon at a fire detection level or higher continuously for a predetermined period of time in order to prevent non-fire alarms due to transient fire (similar) phenomena. When the receiver side determines that a fire has occurred, it determines that a fire has occurred, and issues a fire display or f-alarm.

By the way, in the case of an accumulation type receiver that performs accumulation operation without resetting the fire detector, it is not possible to use a conventional fire detector with a self-holding function. , once a fire phenomenon exceeding the fire level (e.g., heat, smoke, flame light, gas) is detected, the circuit that sends out the fire signal (or the circuit that controls the signal sending circuit) self-holds and then immediately Even if the fire phenomenon has disappeared, the fire signal continues to be output. Therefore, as in the above case, if the fire detector mentioned above is connected to a storage type receiver, there is a problem that the storage type receiver will operate even in the event of a temporary fire phenomenon and issue a non-fire alarm. It is from.

From the above points, it is desirable to connect a non-lock type (non-self-holding type) fire detector to a storage type receiver.
This non-locking type fire detector outputs a fire signal only when the fire phenomenon exceeds the fire level, and stops outputting the fire signal once the fire phenomenon has fallen below the fire level.

[Problems with conventional technology]

However, even if a non-lock type fire detector is connected to a storage type receiver and an operation indicator light (th operation confirmation light) is installed on the fire detector to indicate that the fire detection section has operated, the fire signal will not be detected. The operation indicator light lights up only while the fire signal is being output, and when the fire signal stops generating, the operation indicator light goes out, so it is possible to determine whether the fire signal from which fire detector activated the storage type receiver. The problem is that it is not possible to confirm whether

[Purpose of the Invention] The present invention has been made by focusing on the above-mentioned problems of the conventional art, and is capable of transmitting a fire signal while detecting a fire phenomenon exceeding the fire level, and causing the storage type fire receiver to transmit the fire signal. It is an object of the present invention to provide a fire detector which is capable of self-holding and keeping an operation indicator such as an operation indicator light in operation when the fire detector continuously receives and operates for a predetermined period of time.

[Summary of the Invention] The fire detector of the present invention sends a fire signal to a fire receiver when the fire detection means is activated, and self-maintains the operation when a control signal is received from the fire receiver. It is something.

[Embodiments of the invention] The figure is a circuit diagram showing one embodiment of the present invention.

This embodiment includes a storage type receiver RE, a fire detector DE, and a power supply/signal &a+1+ connecting the storage type receiver RE and the fire detector DE.

The storage type reception 4iJIRE is a receiver that generates an alarm when it receives a fire signal continuously for a predetermined period of time, and includes a fire signal detection circuit 10, a storage circuit 20, an alarm circuit 30,
A voltage drop circuit 40 as a control signal sending means, and about 24
It has a power supply B that generates a voltage of V and a recovery switch SW.

The fire signal detection circuit 10 is a circuit that detects a fire signal from the fire detector DE, and includes a resistor 11 directly connected to the fire detector DE, and a voltage across the resistor 11 that reaches a predetermined voltage. The transistor 12 is turned on when

The accumulation circuit 20 is a circuit that operates when the fire signal has been accumulated for a predetermined period of time, and is composed of an integrating circuit or a timer.

The alarm circuit 30 is a circuit that operates when the storage circuit 20 operates, and includes a transistor 31 and a district relay 32 that operates a fire light, district indicator light, alarm bell, etc. (not shown).
and the node contact 33 of this district relay 32.

The voltage drop means 40, when the alarm circuit 30 operates,
Power supply and signal edge stand as a control signal. This is a circuit for dropping the voltage applied between the terminal and the terminal 1, and includes a make contact 41 of the district relay 32 and a Zener diode 42 of about 8V.

On the other hand, the fire detector DE has a fire detection section 5o.

Constant voltage circuit 51, fire signal sending circuit 60, operation indicator LED, and voltage detection circuit 7 as control signal receiving means
0 and a self-holding circuit 80.

The fire detection unit 50 detects a fire phenomenon, and includes a thermal type, a smoke type (ion, scattering, dimming, etc.), a radiation type, a gas type sensor unit (one or more a), and this sensor. and a detection section that determines whether the output of the section has reached a predetermined level.

The fire signal sending circuit 60 is a circuit that sends a fire signal to the storage type receiver RE when the fire detection section 50 is operating, and when the fire detection section 50 is operating, the input/output terminal T
This is a circuit that sends a fire signal to the fire receiver DE by changing the voltage between T1 and T1 to a first predetermined voltage (for example, 1 av) that does not affect the normal operation of the large voltage output section 50. In other words, the fire signal sending circuit 60 outputs the power source blue signal 0 when the fire detection section 50 operates.

A current is made to flow through the signal detection resistor 11 in the fire signal detection circuit lo through the AC 1. Further, the fire signal sending circuit 60 includes a transistor 61.

It has Zener diodes 62 and 63 and an operation indicator LED. This operation indicator LED serves as an ih display means and also indicates that the fire detection section is in operation.

The voltage detection circuit 70 is a circuit that detects a voltage drop as a control signal caused by the voltage drop circuit 40 of the $ product type receiver RE, and includes a bridge circuit consisting of a transistor 71, a Zener diode 72, and resistors 73, 74, and 75. , comparator 76, transistors 78 and 79, and voltage dividing resistor R
1 and R2.

The self-holding circuit 80 self-maintains the operation of the fire detector DE when the storage time of the storage type receiver is about to elapse and the voltage detection circuit 7o is activated and a fire signal is generated. The circuit is composed of a thyristor 81 such as an SCR. This operation of the self-holding circuit 80 causes the operation indicator light LED to continue lighting.

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

First, assume that the voltage of power supply B is 24V. If no fire phenomenon occurs, only a small amount of current flows through the fire detector DE as a monitoring current. Therefore, the input/output terminals of the fire detector DE Approximately 24V is applied between To and Tl.

Here, when the fire detection section 50 detects a fire phenomenon of a predetermined level, the transistor 61 is turned on, so the operation indicator LED lights up to indicate that the fire detection section 50 is in the operating state, and the Zener diode 62 Since the entire fire signal sending circuit 60 including .63 is conductive, current flows through the resistor 11 in the fire signal detection circuit IO. In this case, the fire detection unit 50 applies sufficient voltage (first predetermined voltage, for example 18V) to the input/output terminals To and T to perform fire monitoring.
(out of 18V, 2V is applied to the constant voltage circuit 51, and 16V is applied to the fire detection section 50).

Then, as described above, when current flows through the resistor 11 of the storage receiver RE (that is, when a fire signal occurs), the transistor 12 turns on and the storage circuit 20 starts M'MK. When a fire signal is generated for a predetermined period of time, the storage circuit 20 is activated and the transistor 31 is turned on. As a result, the #A section relay 32 operates, so the fire light (not shown), i1i! The district indicator light and alarm bell operate, and the meter contact 4 of the district relay 32 of the voltage drop circuit 40 operates.
1 is turned on, the voltage determined by the Zener diode 42 which is the sub-part signal (second predetermined voltage, e.g.

The voltage at the input/output terminals drops to 8v).

By the way, in the fire detector DE, if the fire detection unit 50 is operating, the transistor 71 is on, so the bridge circuit composed of the Zener diode 72 and the resistors 73 to 75 is energized. 1 predetermined voltage, the comparator 76 does not output the H4gh signal. However, in the above case, when the voltage between the input and output terminals To and T1 drops to the second predetermined voltage, the voltage at the inverting input terminal of the comparator 77 Since the voltage at its non-inverting input terminal becomes high, the comparator 76 outputs a High signal. For this reason, the transistors 78 and 79 are turned on, and the gate voltage of the thyristor 81 increases.
1 turns on and maintains itself, and the operation indicator LED maintains the lighting operation.

Therefore, the operation indicator LED lights up when the fire detection unit 50 is operating, and also lights up after the storage layer receiver has finished storing data, so it is possible to detect which one of the many fire detectors in the same system is involved in the fire. The sensor can reliably confirm whether the storage layer receiver has operated. Moreover, the operation indicator LED does not malfunction in response to a temporary fire phenomenon. In other words, the storage circuit 20 of the storage type @ machine RE does not operate in response to a temporary fire phenomenon. Therefore, since the voltage between the input/output terminals To and T1 does not reach the second predetermined voltage, the thyristor 81 does not turn on and the operation indicator LED does not continue its lighting operation.

To reset the operation of the operation indicator LED of the fire detector DE, that is, the operation of the self-holding circuit 80, it is sufficient to turn off the recovery switch SW. Turn off.

゛ In the above embodiment, the operation indicator light LED serves both as an operation display means and a means for displaying the operating status of the fire detection unit 50, but a second indicator light is provided as the operation display means, and this second display The 5CR81 may be connected to the input/output terminal To through a light, and the operation display means may be not only an indicator light but also a magnetic reversal plate or the like that performs mechanical operation.

Further, when the second predetermined voltage is generated in the receiver RE, a third signal line and a terminal therefor are separately provided in order to send the second predetermined voltage to the fire detector DE,
An AND means for detecting that a second predetermined voltage is input to the fire detector DE through the signal line JL3 and a fire detection signal is generated is provided as a control signal receiving means, and when this AND means operates, the thyristor 81 may be turned on.

[Effects of the Invention] According to the present invention, a fire signal is output without self-holding while a fire phenomenon exceeding the fire level is detected, and the storage type fire receiver is operated by this fire signal and outputs a control signal. Suitable for connection with a storage type fire receiver that performs self-holding operation in response to this control signal when output.
It has the effect of providing a fire detector.

[Brief explanation of drawings]

The figure is a circuit diagram showing an embodiment of the present invention. DE...Fire detector, RE...Storage layer receiver, 10... Fire signal detection circuit, 20...;1i' implantation circuit, 30...Alarm circuit. 40... Voltage drop circuit as control signal sending means, 50...Fire detection section, 60...Fire signal sending circuit, 70... Voltage detection circuit as control signal receiving means, 80...Self-holding circuit.

Claims (5)

[Claims] (1) fire detection means for detecting a fire phenomenon; while the fire detection means detects a fire phenomenon of a predetermined level or higher;
fire signal sending means for sending a fire signal to a fire receiver; control signal receiving means for receiving a control signal sent from the fire receiver; A fire detector comprising: self-holding means that operates when the means detects a fire phenomenon of a predetermined level or higher; and operation display means that operates by the self-holding means. (2) In claim 1, the fire signal sending means sends out the fire signal by changing the voltage between the input and output terminals connected to the fire receiver to a first predetermined voltage. The fire detection device is characterized in that the control signal receiving means detects that the voltage between the input and output terminals has changed to a second predetermined voltage different from the first predetermined voltage. vessel. (3) The fire detector according to claim 2, wherein the first predetermined voltage is a voltage sufficient to maintain the function of the fire detection means. (4) The fire detector according to claim 2, wherein the input/output terminal is composed of two terminals. (5) The fire detector according to claim 1 or 2, wherein the operation display means is also activated by the operation of the fire signal sending means.