JPH10162270A - Repeater for self-fire alarm system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speedily issue a fire alarm from both an emergency fire transmitter and a fire sensor even in case of power supply stop by providing a repeater with a power supply stop detecting means for outputting a storage cancel signal to a transmitter responding terminal when power supply is stopped. SOLUTION: A repeater 1 is provided with a voltage discrimination circuit 11 for always monitoring the voltage level of sensor line L and discriminating the alarm due to a fire sensor S and the alarm due to an emergency fire transmitter P and a switching circuit 12 for short-circuitting and connecting a transmitter response line LA to a common terminal C. A power supply stop detecting means B is constituted by combining these voltage discrimination circuit 11 and switching circuit 12. When power supply to the repeater 1 is stopped, the storage cancel signal is transmitted to a fire receiver 2 and storage operation is canceled so that the alarm from the fire sensor S and the emergency fire transmitter P can be speedily issued.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a repeater of a self-fire alarm system which does not require a special transmitter response line when an emergency fire transmitter is connected to a fire receiver.

[0002]

2. Description of the Related Art Conventionally, an automatic fire alarm system (hereinafter referred to as "self-fire alarm system") is known. However, in such an automatic fire alarm system, a fire is transmitted to a detector line derived from a fire receiver. When a fire detector is connected to a fire detector and the fire detector detects a fire alarm, the fire alarm is performed by sounding a local sound after a predetermined storage time set to prevent false alarms.

An emergency fire transmitter having an emergency button is connected to this detector line in parallel with the fire detector. When the emergency button is pressed, the fire detector issues an alarm. The same processing as that at the time can be performed by the fire receiver. However, in the self-fire alarm system, when an emergency fire transmitter issues an alarm, unlike when the fire detector issues an alarm, it is necessary to cancel the accumulation function and immediately perform the fire alarm operation. However, it is necessary for the fire receiver to determine whether the alarm is from a fire detector or an emergency fire transmitter.Therefore, there is no detector line between the fire receiver and the emergency fire transmitter. Another transmitter response line was required.

[0004] In recent years, in order to eliminate the need for wiring a transmitter response line, a fire receiver is used to transmit a report from a fire detector and a report from an emergency fire transmitter on the detector line. A repeater called a storage release adapter has been developed to discriminate and identify by voltage level. FIGS. 5 and 6 show a self-fire alarm system provided with the repeater, which will be described below.

In this system, the fire receiver 110 is provided with sensor line terminals L1 to L5, a transmitter response terminal A, an external power supply terminal (I +) and a common terminal C, and a relay device serving as a storage release adapter. 100 has an external power supply terminal (I
Power is supplied from the fire receiver 110 through (+) and the common terminal C. The fire detector 120 connected between the sensor line L derived from the sensor line terminals L1 to L5 and the common terminal C includes a
When the occurrence of heat is detected and a fire is determined, the fire detector 1
20 decreases to the value of the parallel circuit of the resistors 122 and 124, and at the same time, the light emitting diode 123
Lights up, and at this time, the voltage level between the sensor line L and the common terminal C decreases.

[0006] On the other hand, an emergency fire transmitter 130 having an emergency button 131 is connected in parallel with the fire detector 120, and when an emergency is detected when a fire is detected, the emergency button 13 is activated.
When 1 is pressed, the sensor line terminals L1 to L5 and the common terminal C are short-circuited in the emergency fire transmitter 130, so that the impedance of the sensor line L becomes only the line resistance R100, and the sensor line L Are lower than when the fire detector 120 is activated.

One of the repeaters 100 has a voltage discriminating circuit CP for discriminating the voltage level of the sensor line L at this time.
The voltage discriminating circuit CP has two resistors R10
1, a resistor divider circuit ST configured by connecting R102 in series compares and determines a preset reference value with a voltage level of the sensor line L, and the voltage level of the sensor line L falls below the reference value. Then, by lowering the voltage level of the transmitter response terminal A of the fire receiver 110 to the ground level, an accumulation release signal is sent to the fire receiver 110, and at this time, the light emitting diodes LD102 are simultaneously turned on.

The alarm detection unit 111 of the fire receiver 110
When the voltage level of the sensor line L decreases, the light emitting diode LD101 is turned on, and when either the fire detector 120 or the emergency fire transmitter 130 issues an alarm, the light emitting diode LD101 is turned on. According to the self-fire alarm system having such a configuration, by adding the repeater 100 to the fire receiver 110, the emergency fire transmitter 130 does not have the transmitter response line and the relay Detector 1
20 only needs to be connected between the detector line L and the common terminal C in parallel with the fire detector 120.
It is possible to determine whether the alarm is issued from the fire alarm or from the emergency fire transmitter 130, and activate or release the storage function.

In a large-scale facility, the repeater 100 can cope with a case where there are a plurality of sensor lines L. The relay 100 compares and determines the voltage level of each of the sensor lines L to determine a fire. It is determined whether the alarm is from the sensor 120 or the emergency fire transmitter 130, and if the alarm is from the emergency fire transmitter 130, the fire receiver 110 sends a transmitter response signal via the transmitter response line. Can be transmitted to cancel the storage function.

[0010]

However, according to the above-described conventional self-fire alarm system, the repeater operates by receiving power supply from an external power supply terminal and a common terminal of the fire receiver. Therefore, when the power supply line is disconnected or the like, the signal cannot be transmitted to the fire receiver even if the emergency fire transmitter issues an alarm.

That is, in such a repeater, if the power supply from the external power supply terminal of the fire receiver is cut off, the voltage level of the detector line cannot be compared with the reference value. The storage release signal could not be output via the machine response line. Therefore, even if an emergency fire signal is issued, the storage function is not canceled by the fire receiver, so it is determined that a fire detector has been fired, and it takes time before a fire alarm is issued. was there.

The present invention has been made in view of the above circumstances, and when a power supply line from a fire receiver is cut off due to disconnection or the like, the storage function is immediately released, and an emergency fire transmitter, An object of the present invention is to provide a repeater of a self-fire alarm system capable of promptly issuing a fire alarm to any of fire detectors.

[0013]

In order to achieve the above object, a repeater of the self-fire alarm system of the present invention is connected to an external power supply terminal of a fire receiver having a storage function. It has a voltage discrimination circuit that operates by receiving power supply through a power supply line, and is connected to the transmitter response terminal and the common terminal of the fire receiver, and is derived from the detector line terminal of the fire receiver to detect a fire. Detector, connected to the detector line to which the emergency fire transmitter is connected, the voltage determination circuit determines the magnitude of the voltage level of the detector line,
At the time of the alarm of the emergency fire transmitter, in the repeater of the self-fire alarm system configured to output the accumulation release signal to the transmitter response terminal, when the power from the fire receiver is cut off, The power supply cutoff detecting means for outputting the storage release signal to the transmitter response terminal is further provided.

In such a self-fire alarm system, when a fire detector connected to a detector line issues an alarm and when an alarm is issued by pressing an emergency button of an emergency fire transmitter, an alarm is issued. The remaining voltage level of the equipment line is different. That is,
Generally, the remaining voltage level of the detector line is set to a lower value when an emergency fire signal is issued than when a fire sensor is issued.

On the other hand, the voltage discriminating circuit of the repeater
It operates by receiving power supplied from the external power supply terminal of the fire receiver, and compares the remaining voltage level of the sensor line with a predetermined reference value. When it is determined that the voltage is low, the storage release signal is output, but when it is determined that the remaining voltage level of the sensor line is higher than the reference value, the storage release signal is not output.

Therefore, in the fire receiver, if the voltage level of the detector line is reduced and the alarm of the detector line is detected, if the transmitter response terminal inputs the storage release signal, the fire receiver becomes emergency. Judging that the alarm was issued by a fire transmitter, the storage function is released and a fire alarm is output immediately.However, when the alarm level of the detector line is detected when the voltage level of the If the response terminal does not input the accumulation release signal, it is determined that a normal fire detector is alerted, the accumulation operation is executed, and a fire alarm is output.

On the other hand, when the power supplied from the fire receiver through the external power terminal is cut off, the voltage determination circuit does not operate. Therefore, even if a fire detector or an emergency fire transmitter connected to the detector line issues a warning, the determination cannot be made. However, according to the present invention, the power cut-off detecting means determines that the power has been cut off. The fire receiver outputs a storage release signal to the transmitter response terminal of the fire receiver.Therefore, the fire receiver that receives this storage release signal will force storage if the voltage level drops on the sensor line. To release a fire alarm. Therefore, in an emergency when the power supply line is disconnected, even if the emergency fire alarm is issued, it is not ignored and the safety is high.

According to a second aspect of the present invention, the accumulation release signal generating means is constituted by combining a voltage discriminating circuit and a switching means which is turned on or off by an output of the voltage discriminating circuit. When the voltage level of the sensor line is monitored and the voltage level is lower than a predetermined reference value, it is determined that an alarm has been issued by an emergency fire transmitter, and the accumulation canceling signal is generated by turning on or off the switching means. It is configured to output.

When the voltage level of the sensor line is lower than a predetermined reference value, the voltage discriminating circuit of the repeater discriminates the alarm from the emergency fire transmitter and turns on or off the switching means. An accumulation release signal is output. According to a third aspect of the present invention, the switching means is configured to output an accumulation release signal for maintaining the voltage level of the transmitter response terminal at a predetermined level.

In this configuration, the voltage judgment circuit of the repeater
If the voltage level of the detector line is lower than a predetermined reference value, it is determined that the alarm is issued by an emergency fire transmitter, and the switching means is turned on or off to output a storage release signal. , The voltage level of the transmitter response terminal is maintained at a predetermined level. Further, in claim 4, the switching means has a relay means, and when the power supply from the power supply line is cut off and the voltage determination circuit becomes inoperable, the switching means is turned off to turn off the switching means. The configuration is such that the transmitter response terminal is held at the ground level through a normally closed contact to output an accumulation release signal.

Therefore, when the power supply to the voltage discriminating circuit is cut off, the contact of the relay means is closed and the transmitter response terminal is kept at the ground level, but the storage function is released in the fire receiver. Therefore, if a voltage level drop occurs in the sensor line, it is determined that an emergency fire transmitter has been issued, and a fire alarm is output immediately. As described above, according to the repeater of the present invention, when the power supply from the fire receiver is stopped, whether the fire detector or the emergency fire transmitter is activated, Outputs a response signal and releases the accumulation function. Therefore, even if the fire detector gives a false alarm, a fire alarm will be issued immediately. Side.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating an example of a configuration of a self-fire alarm system including a repeater of the present invention. In the illustrated self-fire alarm system, the fire receiver 2 having a storage function includes a sensor line terminals L1 to L5 for deriving the sensor line L, an external power terminal (I +), a transmitter response terminal A, and a common terminal. A terminal C is provided, and power is supplied to the repeater 1 by using an external power supply terminal (I +) and the common terminal C as power supply lines.

Also, the five detector lines L of the fire receiver 2
Are connected in parallel to a fire detector S and an emergency fire transmitter P provided with a push button (not shown), and the relay 1 connected to each detector line L is connected to a fire receiver. 2
Built-in. The repeater 1 is connected to each detector line L, and is also connected via a power supply line L (I +) and a transmitter response line LA provided in the fire receiver 2, and the power supply line L ( I +) and a voltage discriminating circuit 11 that operates by receiving power supply.
If any one of the detector lines L issues an alarm, the voltage discriminating circuit 11 determines whether the alarm has been issued by the fire detector S or the emergency fire transmitter P. If the alarm is issued by P, the transmitter response line LA
, And outputs a storage release signal to cause the fire receiver 2 to release the storage function.

The repeater 1 constantly monitors the voltage level of the detector line L, and determines whether the fire detector S has an alarm or the emergency fire transmitter P has an alarm.
And a switching circuit 12 for short-circuiting the transmitter response line LA to the common terminal C based on the determination result of the voltage determination circuit 11, and combining the voltage determination circuit 11 with the switching circuit 12. Thus, the power cutoff detecting means B is configured.

The voltage discriminating circuit 11 compares and determines the level of the remaining voltage of the sensor line L with a preset reference value.
If the voltage level falls below the reference value, it is determined that an alarm has been issued by the emergency fire transmitter P, and the switching circuit 12
, The transmitter response line LA is connected to the common terminal C, and short-circuited. Here, the reference value is
This is a voltage level for discriminating the alert from the fire detector S and the emergency alert from the emergency fire transmitter P. The voltage discrimination circuit 11 detects one or more detector lines L or any one of them. When there is an alert on the equipment line L, the identification is performed.

In the present invention, the switching circuit 12
However, it is characterized in that it is controlled in accordance with the power supply from the fire receiver 2. That is, when power is supplied to the voltage determination circuit 11 via the power supply line L (I +) and the common terminal C, the connection between the transmitter response line LA and the common terminal C is kept open, If a part of the supply line L (I +) is disconnected, for example,
The power supply from the fire receiver 2 to the repeater 1 is stopped,
At this time, the switching circuit 12 is connected to the transmitter response line L
A and the common terminal C are short-circuited, or the transmitter response terminal A is directly dropped to the ground level.

Therefore, when power is supplied to the voltage determination circuit 11 via the power supply line L (I +), the voltage determination circuit 11 determines that the voltage level of the sensor line L is higher than a preset reference value. If you decide
The switching circuit 12 is turned on to disconnect the transmitter response line LA and the common terminal C, while the voltage determination circuit 11
Compares the voltage level of the sensor line L with a preset reference value, and when it is determined that the voltage level of the sensor line L is lower than the reference value, turns off the switching circuit 12 and turns off the transmitter response line. The connection between the LA and the common terminal C is made, and an accumulation release signal is output to the fire receiver 2 to release the accumulation.

Therefore, when the power supply line L (I +) to the fire receiver 2 is cut off and the power supply to the repeater 1 is cut off, the fire receiver 2 sends an accumulation release signal to the fire receiver 2. Is transmitted, and the accumulation operation of the fire receiver 2 is released, so that a fire alarm is also immediately issued by the fire detector S, but at least when the emergency fire transmitter P fires In addition, it is possible to prevent the notification of the fire alarm from being delayed.

Next, an example of a circuit configuration of the voltage determination circuit 11 and the switching circuit 12 will be described. FIG. 2 shows a voltage discriminating circuit 11 configured by using a comparator CMP. A reference value setting circuit 13 is connected to a non-inverting input terminal of the comparator CMP. It is connected. The comparator CMP receives power from a power supply line L (I +) supplied between the external power supply terminal (I +) and the common terminal C, and supplies a voltage between the inverting input terminal and the non-inverting input terminal to the common terminal C. The levels are compared, and if the inverted input signal is smaller than the non-inverted input signal, the switching circuit 1
2 is turned off, and if the inverted input signal is larger than the non-inverted input signal, the switching circuit 12 described later is turned on.

Here, the reference value setting circuit 13 is configured by connecting diodes D and D1 and resistors R1 and R2 in series between the external power supply voltage V of the fire alarm device 2 and the common terminal C. The voltage level determined by the forward voltage drop of the diode D1 and the voltage shared by the resistor R2 is input to the non-inverting input terminal of the comparator CMP as a reference value. The reference value set by the reference value setting circuit 13 is set to a voltage level lower than the voltage level of the detector line L when the fire detector S is activated and higher than the voltage level when the emergency fire transmitter P is activated. Therefore, the comparator CMP turns off the switching circuit 12 when the voltage level of the sensor line L falls below the reference value or when the power supply to the comparator CMP is cut off.

It should be noted that the circuit configuration shown is an example. When a plurality of sensor lines L are to be used, a plurality of comparators CMP are provided for each of them, and one of the comparators CMP has a line voltage. If it is determined that the voltage falls below the reference value, the switching circuit 12 may be turned off. The switching circuit 12 shown in FIG. 3 includes a transistor TR connected to a driving power supply V.
1, the capacitors C1 and C2, the resistors R3 and R4, and the diodes D and D2 are connected as shown in the figure. The relay RY1 is energized to open and close the contact NC.

That is, the diode D2 is connected in parallel with the exciting coil RY1 of the relay, and the fire receiver 2 is connected.
Normally closed contact NC between the transmitter response terminal A and the common terminal C
And the base of the transistor TR1 is connected to the output terminal of the comparator CMP via the resistor R4. According to such a configuration, when the comparator CMP turns on the transistor TR1, the exciting coil RY1 of the relay is activated.
Is turned on and the normally closed contact NC is opened, so that the transmitter response terminal A holds the voltage level of the power supply circuit RA, while the comparator CMP turns off the transistor TR1,
Since the energization to the exciting coil RY1 of the relay is released,
The normally closed contact NC is closed, the transmitter response terminal A is pulled down to the ground level, and is sent to the fire receiver 2 as an accumulation release signal.

Therefore, the comparator CMP turns off the transistor TR1 when the voltage level of the sensor line L becomes lower than the reference value or when the power supply from the fire receiver 2 to the comparator CMP is cut off. The energization of the exciting coil RY1 of the relay is blocked, so that the normally closed contact NC is closed and the transmitter response terminal A
Is dropped to the ground level, and sent to the fire receiver 2 as an accumulation release signal. As a result, fire receiver 2
If the alarm is detected due to a decrease in the voltage level of the sensor line L, it is determined that the alarm is issued by the emergency fire transmitter P, and the fire alarm is immediately output.

On the other hand, when the voltage level of the sensor line L is higher than the reference value, the comparator CMP turns on the transistor TR1, so that the exciting coil RY1 of the relay is energized, and the normally closed contact NC is opened to transmit the signal. The device response terminal A is held at the level of the power supply voltage RA, and the accumulation release signal is released. As a result, when the fire receiver 2 detects the alarm due to the decrease in the voltage level of the sensor line L, it is determined that the alarm is issued by the normal fire detector S,
In order to prevent false alarm, a predetermined accumulation operation is started, and a fire alarm is output after the accumulation operation.

Next, the appearance of the repeater 1 of the present invention is shown in FIG. 4A is a partially cutaway front view, and FIG.
Is a side view, and (c) is a rear view. In this repeater 1,
Voltage discriminating circuit 11 and switching circuit 1 as described above
And a lead portion connected to each of the sensor line L (L1 to L5), the common terminal C, the transmitter response line A, and the external power supply terminal (I +). Fire receiver 2 and emergency fire transmitter P
There is no need to wire a transmitter response line in between.

Here, the configuration is such that up to five sensor lines L can be connected, but the present invention is not limited to this.

[0037]

As can be understood from the above description, according to the repeater in the self-fire alarm system according to claims 1 to 4 of the present invention, the relay is connected to the detector line,
Just connect through the external power supply terminal, common terminal, and transmitter response terminal. If the power supply from the external power supply terminal is cut off due to disconnection or the like, the fire receiver will be released from accumulation, so the emergency fire transmitter When a warning is issued, a fire alarm can be promptly notified.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a configuration of a repeater in a self-fire alarm system of the present invention.

FIG. 2 is a circuit diagram illustrating an example of a configuration of a voltage determination circuit.

FIG. 3 is a circuit diagram illustrating an example of a configuration of a switching circuit.

FIG. 4 is a diagram illustrating an example of an external configuration of a repeater.

FIG. 5 is a diagram showing a schematic configuration of a repeater in a conventional self-fire alarm system.

FIG. 6 is a circuit diagram showing a basic configuration of a self-fire alarm system incorporating a repeater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Repeater 11 ... Voltage discrimination circuit 12 ... Switching circuit 2 ... Fire receiver S ... Fire detector P ... Emergency fire transmitter L1-L5 ... Detector line Terminal L: Sensor line I +: External power supply terminal A: Transmitter response terminal B: Power cutoff detection means C: Common terminal

Claims (4)

[Claims] 1. A fire detector having a voltage discriminating circuit connected to an external power supply terminal of a fire receiver having a storage function and operated by receiving power supply from the fire receiver through a power supply line. Connected to a fire detector and a fire detector, and connected to a detector line connected to a fire detector and an emergency fire transmitter. In the relay of the self-fire alarm system configured to determine the magnitude of the voltage level of the line and to output a storage release signal to the transmitter response terminal when an emergency fire alarm is issued, the relay includes: A self-fire alarm system repeater further comprising a power cutoff detecting means for outputting a storage release signal to the transmitter response terminal when power supply from the fire receiver is cut off. 2. The voltage judgment circuit according to claim 1, wherein the power cutoff detection means is constituted by combining the voltage judgment circuit and switching means turned on or off by an output of the voltage judgment circuit. Is a repeater of a self-fire alarm system configured to output an accumulation release signal by turning on or off the switching means when the voltage level of the sensor line is lower than a predetermined reference value. 3. The repeater according to claim 2, wherein said switching means outputs an accumulation release signal for keeping a voltage level of said transmitter response terminal at a predetermined level. 4. The switching means according to claim 3, wherein said switching means has a relay means, and said voltage discriminating circuit cuts off power supply to said relay means when power from said fire receiver is cut off. The relay of the self-fire alarm system is configured to output the accumulation release signal by holding the transmitter response terminal at the ground level through the normally closed contact.