JP3906659B2 - Automatic fire alarm system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a main line derived from a receiver and a branch line derived from a repeater on the main line. The main line sensor, the repeater, and the sensor on the branch line are separately provided. The present invention relates to an improvement of an automatic fire alarm system operated by a power source.
[0002]
[Prior art]
Conventionally, in a large-scale building such as an apartment house, an automatic fire alarm system has been used. An example of such a system is shown in FIG.
[0003]
In this device, the sensors S1 and S2 and the repeaters 200 (# 1 to # 3) are connected to the main line L1 derived from the receiver 100, and branched to the repeaters 200 (# 1 to # 3). Sensors S′1 to S′3 are further connected via the line L3.
[0004]
From the receiver 100, power is supplied to the main line L1, and the sensors S1 and S2 of the main line L1 operate by this power. Further, another power supply 300 supplies power to the power supply line L2, and the power supply operates the repeater 200 and the sensors S′1 to S′3 on the repeater 200.
[0005]
According to such a configuration, when the detectors S1 and S2 on the main line L1 detect a fire or the like, the built-in contact is closed, so that the voltage of the main line L1 decreases. The receiver 100 receives this and performs predetermined processing.
[0006]
When the sensors S′1 to S′3 on the branch line L3 detect a fire or the like, the built-in contacts are closed, and the voltage of the branch line L3 decreases. Then, the repeater 200 from which the branch line L3 is derived receives a voltage drop and closes the built-in contact, so the voltage of the main line L1 drops. The receiver 100 receives this and performs predetermined processing.
[0007]
[Problems to be solved by the invention]
By the way, in the above-described conventional automatic fire alarm system, when one of the sensors on the main line operates, the contact is closed and the main line is closed, so that other sensors on the main line cannot operate.
[0008]
However, since repeaters and detectors on branch lines are operated by a power source from another power source, they can operate even when the main line is closed, so the detectors on the branch line are activated. Each time the contact of the corresponding repeater is closed, the current value on the main line increases, resulting in an increase in current consumption, possibly leading to the worst system down.
[0009]
The present invention has been made in view of the above circumstances, and provides an automatic fire alarm system capable of shutting off the supply of another power source to the repeater when the detector operates and the voltage of the main line decreases. The purpose is to do.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, in the automatic fire alarm system according to claim 1 of the present invention, each repeater has a branch line derived from the respective repeater with the main line voltage lowered. When the voltage of the branch line is not lowered, the switching means for cutting off the power from another power source and the sensor on the branch line derived from each repeater are activated, and when the voltage drop of the branch line is sensed. In this configuration, the main line is closed and a contact for lowering the voltage of the main line is provided.
[0011]
The automatic fire alarm system according to claim 2 is characterized in that the switching means of the repeater cuts off the power source from the separate power source by turning on and off the selector switch.
[0012]
The automatic fire alarm system according to claim 3 is characterized in that the sensor connected to the main line closes a built-in contact and lowers the voltage of the main line when operating.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of the configuration of the main part of the automatic fire alarm system of the present invention.
[0014]
In this device, the sensors S1, S2 and the repeaters 2 (# 1, # 2) are connected to the main line L1 derived from the receiver 1, and the repeaters 2 (# 1, # 2) are branched. Sensors S′1 and S′2 are further connected via a line L3.
[0015]
The power is supplied from the receiver 1 to the main line L1, and the sensors S1 and S2 of the main line L1 are operated by this power. Further, another power source 3 supplies power to the power line L2, and this power source operates the repeater 2 and the sensors S′1 and S′2 on the repeater 2.
[0016]
The repeater 2 receives a fire detection circuit 20 that senses a voltage drop in the branch line L3, and a power supply circuit 21 for operating the repeater 2 and the detectors S′1 and S′2 by receiving power from another power supply 3. A switching circuit 22, a contact 23, and a changeover switch 24.
[0017]
The changeover circuit 22 and the changeover switch 24 constitute the changeover means of the present invention, and perform the processing as shown in FIG. FIG. 2 is a diagram for explaining the operation of the switching means.
As shown in the figure, the switching means controls to cut off the supply of another power source when there is no voltage drop in the branch line L3 and there is a voltage drop in the main line L1. Further, when there is no voltage drop in both lines L1 and L3, control is performed so as to maintain the supply of another power source. Further, control is performed so that the supply of another power source is maintained even when the voltage of both lines L1 and L3 is lowered.
[0018]
That is, when the detectors S1 and S2 on the main line L1 detect a fire or the like, the built-in contact is closed, and the voltage of the main line L1 decreases. At this time, on each repeater 2 side, there is a voltage drop in the main line L1, but there is no voltage drop in the branch line L3, which corresponds to the pattern 1 in FIG. The switch 24 is opened to cut off the power supply from the separate power source 3 to the power circuit 21.
[0019]
When the sensors S′1 and S′2 on the branch line L3 detect a fire or the like, the built-in contacts are closed, and the voltage of the branch line L3 decreases. Then, the relay 2 from which the branch line L3 is derived receives a voltage drop and closes the built-in contact 23, so that the voltage of the main line L1 drops. In this case, on the side of the repeater 2 from which the branch line L3 is derived, the voltage drops in both the main line L1 and the branch line L3, which corresponds to the pattern 3 in FIG. The power supply from the separate power supply 3 to the power supply circuit 21 is maintained in the closed state.
[0020]
On the other hand, on the other side of the repeater 2 other than the derived repeater 2 of the branch line L3, there is a voltage drop of the main line L1, but there is no voltage drop of the branch line L3, which corresponds to the pattern 1 in FIG. Since it is in the state, the changeover circuit 22 is operated, the changeover switch 24 is opened, and the power supply from the separate power supply 3 to the power supply circuit 21 is cut off.
[0021]
According to the present invention having such a configuration, when only the sensors S1 and S2 on the main line L1 are activated, the sensors S′1 and S′2 on the branch line L3 are connected to the separate power source 3 via the repeater 2. Therefore, the operation is not performed, and an increase in current on the main line L1 can be suppressed.
If only the sensors S′1 and S′2 on the branch line L3 are activated instead of the sensors S1 and S2 on the main line L1, the sensors S′1 and S ′ on the branch line L3 are activated. 2 closes, the voltage of the branch line L3 to which the sensors S'1 and S'2 are connected decreases, so that the relay 2 to which the activated sensors S'1 and S'2 are connected is connected. On the side, by closing the contact 23, the main line L1 is short-circuited to lower the voltage of the main line L1.
Then, on the side of the repeater 2 to which the activated sensors S′1 and S′2 are connected, the voltage of the main line L1 is lowered and the voltage of the branch line L3 is lowered to the pattern 3 in FIG. Since it becomes a corresponding state, the switching circuit 22 of the repeater 2 maintains the connection with the separate power source 3 and maintains the power supply from the separate power source 3.
On the other hand, in other repeaters 2 other than the repeater 2 to which the activated sensors S′1 and S′2 are connected, the voltage of the main line L1 is lowered, but the branch derived from the repeater 2 Since the voltage of the line L3 is not lowered and corresponds to the pattern 1 in FIG. 2, the switching circuit 22 cuts off the power supply from another power source.
Thus, when the sensors S′1 and S′2 on the branch line L3 are activated, the repeater 2 side to which the activated sensors S′1 and S′2 are connected can be activated by the separate power source 3. The relay 2 other than the repeater 2 to which the activated sensors S′1 and S′2 are connected can be cut off and the branch line on the other repeater 2 side. The sensors S′1 and S′2 on L3 do not operate because they are not supplied with the separate power supply 3, and can suppress an increase in current on the main line L1.
[0022]
【The invention's effect】
As can be understood from the above description, in the automatic fire alarm system according to claim 1 of the present invention, the switching means of each repeater reduces the voltage of the main line and the voltage of the branch line. When it is not, the power supply from the separate power supply is cut off. Therefore, when the sensor on the main line operates and the voltage on the main line decreases, the supply of the separate power supply to these repeaters can be cut off.
In addition, in each repeater, when the voltage of the main line is lowered by the contact of the other repeater to which the activated sensor is connected, the voltage of the main line is lowered, and the branch line In order to cut off the supply of the separate power supply, the relay of the activated sensor can be properly notified from the connected relay, and the other repeater side sensor is connected to the separate power supply. The increase in current flowing through the main line can be suppressed by cutting off the supply.
Furthermore, the contact of each repeater closes the main line when it senses a drop in the voltage of the branch line due to the activation of the sensor on the branch line derived from the repeater. Since the voltage is reduced, while the sensor on one repeater is operating, the supply of another power source to another relay that is not operating the connected sensor can be cut off. The increase in the current of the main line due to the sensor operation on the repeater can be suppressed.
[0023]
In the automatic fire alarm system according to the second aspect, the switching means is configured to turn on and off the changeover switch, and the switching means can be configured easily and inexpensively.
[0024]
In the automatic fire alarm system according to claim 3, the sensor connected to the main line closes the built-in contact and lowers the voltage of the main line at the time of operation, so the sensor on the main line operates. When it does, supply of the separate power supply to each repeater can be interrupted.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a main configuration of an automatic fire alarm system according to the present invention.
FIG. 2 is a diagram for explaining the operation of switching means.
FIG. 3 is a diagram showing a configuration of a conventional automatic fire notification system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Receiver 2 ... Repeater 3 ... Separate power supply 22 ... Switching circuit 23 ... Contact 24 ... Changeover switch L1 ... Main line L3 ... Branch line S1, S2 , S'1, S'2 ... Sensor

Claims (3)

A sensor and a plurality of repeaters are connected to the main line derived from the receiver, and the repeater is configured by further connecting a sensor via a branch line, through the main line from the receiver. In the automatic fire alarm system that operates the detector on the main line by power supply, while operating the repeater and the sensor connected to the repeater by power supply through a power line from another power source,
Each repeater has a switching means for cutting off the power from the separate power source when the voltage of the main line is lowered and the voltage of the branch line derived from each of the repeaters is not lowered,
A contact for lowering the voltage of the main line by closing the main line when detecting a voltage drop of the branch line due to activation of a sensor on the branch line derived from each repeater; Automatic fire alarm system with a built-in configuration . In claim 1,
The automatic fire alarm system characterized in that the switching means of the repeater cuts off the power source from the separate power source by turning on and off the selector switch. In claim 1 or claim 2,
An automatic fire alarm system characterized in that a sensor connected to the main line closes a built-in contact and lowers the voltage of the main line when activated.

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