JP2020052666A - Fire alarm system and fire alarm method - Google Patents

Abstract

To provide a fire alarm system or a fire alarm method capable of simplifying the work of laying wiring for connecting a sensor and an alarm device.SOLUTION: A fire alarm system S includes a sensor 11 that detects a fire, an alarm unit 12 that issues an alarm, and a control device 2 that is connected to the sensor and the alarm unit via first wiring L1 and second wiring L2. The sensor is connected between the first wiring and the second wiring, and flows a sensing current from the first wiring side to the second wiring side when a fire is detected. The alarm unit is connected between the first wiring and the second wiring, and issues an alarm on condition that an alarm current is supplied from the control device to the first wiring side from the second wiring side. The control device supplies the alarm current to the alarm unit from the second wiring side to the first wiring side when detecting that the sensor has flowed the sensing current from the first wiring side to the second wiring side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fire notification system and a fire notification method for notifying a fire.

  In a conventional fire alarm system, wiring for connecting a detector for detecting a fire to a receiver and wiring for connecting an alarm device for alarming a fire to a receiver are provided separately (for example, See Patent Document 1).

JP 2008-186186 A

  In the fire alarm system described in Patent Literature 1, it is necessary to separately perform the work of laying the wiring for connecting the sensor to the receiver and the work of laying the wiring for connecting the alarm device to the receiver. Has been complicated, and the amount of wiring has increased.

  Therefore, the present invention has been made in view of these points, and provides a fire alarm system or a fire alarm method that can simplify the work of laying wiring for connecting a sensor and an alarm device to another device. The purpose is to:

  A fire alarm system according to a first aspect of the present invention includes a sensor that detects a fire, an alarm that issues an alarm, and a control that is connected to the sensor and the alarm via a first wiring and a second wiring. A sensor is connected between a first wiring and a second wiring, and when a fire is detected, flows a sensing current from the first wiring side to the second wiring side; The alarm is connected between the first wiring and the second wiring, and issues an alarm on condition that an alarm current is supplied from the control device from the second wiring to the first wiring. The control device, when detecting that the sensor has caused the sensing current to flow from the first wiring side to the second wiring side, directs the control device from the second wiring side to the first wiring side. To supply the alarm current to the alarm device.

  A controller configured to detect that the sensor has passed the sensing current from the first wiring side to the second wiring side; and a controller configured to detect the second wiring side to the first wiring side. A current generating unit for flowing the alarm current, a monitoring state in which the detecting unit is connected to the first wiring and the second wiring, and a current generating unit connected to the first wiring and the second wiring. And a changeover switch for switching between an alarm state.

  The fire alarm system may further include a control unit that controls the switch to switch from the monitoring state to the alarm state when the detection unit detects that the sensing current has flowed. The fire alarm system may further include a first current limiting circuit between the first wiring and the second wiring for limiting the flow of the alarm current to the sensor. The fire alarm system may further include a bypass circuit for passing a part of the alarm current to the sensor in parallel with the first current limiting circuit.

  The sensor further includes an operation light that is turned on when a fire is detected, and the bypass circuit includes a current for maintaining the operation light after the sensor flows the detection current. May flow to the sensor. The fire alarm system includes a second current limiting circuit that limits a current from flowing from the first wiring side to the second wiring side to the alarm device between the first wiring and the second wiring. May be further provided.

  According to a second aspect of the present invention, there is provided a fire alarm method, comprising: a detector for detecting a fire; an alarm for issuing an alarm; and a control connected to the detector and the alarm via a first wiring and a second wiring. A fire alarm system in the fire alarm system, comprising: a sensor connected between a first wiring and a second wiring, when the sensor detects a fire, the first wiring side from the first wiring side. (2) flowing a sensing current to the wiring side; and the controller detecting that the sensor has flowed the sensing current from the first wiring side to the second wiring side; Supplying an alarm current to the alarm device from the second wiring side toward the first wiring side after the detecting step, and connecting between the first wiring and the second wiring. The alarm device is connected to the second wiring from the second wiring side. A step of issuing an alarm on the condition that the alarm current from the control device to the wiring side is supplied, has.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that laying operation | work of the wiring which connects a sensor and an alarm device can be simplified, or the amount of conducting wires required for these wirings can be reduced.

It is a figure showing an outline of a fire alarm system of an embodiment. It is a figure showing composition of a district circuit. It is a figure showing composition of a sensor. FIG. 3 is a diagram illustrating a connection example of a bypass circuit. It is a flowchart which shows the example of the processing procedure of the fire alert by the fire alert system.

[Overview of fire alarm system]
FIG. 1 is a diagram showing an outline of a fire alarm system S of the present embodiment. The fire notification system S reports the occurrence of a fire. The fire alarm system S includes a district facility 1-1 to a district facility 1-N, and a control device 2. The control device 2 is, for example, a P-type receiver that can communicate with the district facilities 1-1 to 1-N, but is provided between the district facilities 1-1 to 1-N and the receiver. It may be a repeater in an R-type fire alarm system.

  The district facilities 1-1 to 1-N (sometimes referred to as district facilities 1) are installed in any of a plurality of districts allocated in the building. Each of the district facilities 1-1 to 1-N detects the occurrence of a fire in the installed district and outputs an alarm. The district is, for example, a partitioned room in a building as one unit, but a single district may include a plurality of rooms.

  The district facility 1-1 to the district facility 1-N include various devices connected to the control device 2 by the first wiring L1 and the second wiring L2. The district equipment 1-1 to the district equipment 1-N include a sensor 11 (denoted by S in FIG. 1), an alarm 12 (denoted by B in FIG. 1), and a termination circuit 13 (denoted by B in FIG. 1). , T), a current limiting circuit 14, and a current limiting circuit 15.

  The sensor 11 is connected between the first wiring L1 and the second wiring L2. The sensor 11 has a sensor for detecting the occurrence of a fire, and detects, for example, smoke from a fire. The sensor 11 is turned on when a fire is detected, and flows a sensing current from the first wiring L1 to the second wiring L2. Further, the sensor 11 turns on a built-in operation lamp (not shown) when detecting the occurrence of a fire.

  The alarm 12 is connected between the first wiring L1 and the second wiring L2. The alarm 12 issues an alarm for notifying the occurrence of a fire. The alarm 12 emits an alarm sound for notifying the occurrence of a fire, for example, by a built-in speaker (not shown). The alarm 12 may be a light alarm that emits a flash light as an alarm.

  Due to the action of the current limiting circuit 15 disposed between the alarm 12 and the second wiring L2, no current flows from the first wiring L1 to the second wiring L2 in the alarm 12. On the other hand, the alarm device 12 issues an alarm on condition that the alarm current generated by the control device 2 is supplied from the second wiring L2 side to the first wiring L1 side.

  The termination circuit 13 is connected between the end of the first wiring L1 and the end of the second wiring L2. The termination circuit 13 is provided for the control device 2 to detect a line abnormality such as a disconnection of the first wiring L1 and the second wiring L2 by monitoring a voltage between the first wiring L1 and the second wiring L2. Have been.

  The current limiting circuit 14 is arranged between the first wiring L1 and the second wiring L2, and limits the flow of the alarm current to the sensor 11. On the other hand, the current limiting circuit 14 does not limit the sensing current flowing from the first line L1 to the second line L2. The current limiting circuit 14 is, for example, a diode, but may be another device as long as it has a function of flowing a current in one direction.

  The current limiting circuit 15 is arranged in series with the alarm 12 between the first wiring L1 and the second wiring L2. The current limiting circuit 15 limits the current flowing from the first wiring L1 toward the second wiring L2 to the alarm device 12. On the other hand, the current limiting circuit 15 does not limit the alarm current flowing from the second line L2 to the first line L1. Since the current limiting circuit 15 is arranged in series with the alarm device 12, the alarm device 12 does not issue an alarm when a sensing current flows from the first wiring L1 side to the second wiring L2 side. An alarm can be issued when an alarm current flows from the line L2 to the first line L1. The current limiting circuit 15 is, for example, a diode like the current limiting circuit 14, but may be another device as long as it has a function of flowing a current in one direction.

  The control device 2 is connected to the sensor 11 and the alarm 12 via the first wiring L1 and the second wiring L2. The control device 2 includes an operation unit 21, a display unit 22, a power supply unit 23, district circuits 24-1 to 24-N (N indicates the number of district circuits), a storage unit 25, and a main control unit 26. The operation unit 21 is a device for a person (hereinafter, referred to as a user) in the facility to perform various inputs, and is configured by, for example, operation keys or a touch panel. The display unit 22 is a panel having a display and a light source for displaying various information. For example, when a fire occurs, the display unit 22 displays the area where the fire has occurred. The power supply unit 23 supplies electric power to each component such as the operation unit 21 of the control device 2 and the district facilities 1-1 to 1-N.

  The district circuits 24-1 to 24-N (may be referred to as a district circuit 24) detect whether or not the corresponding district facilities 1-1 to 1-N have detected the occurrence of a fire. . The local circuits 24-1 to 24-N are connected to the local circuits in the area where the fire is detected when the detector 11 detects that the sensing current has flowed from the first wiring L1 toward the second wiring L2. An alarm current is supplied to the alarm device 12 from the two lines L2 to the first line L1. Among the district circuits 24-1 to 24-N, the district circuit 24 that has detected a fire supplies an alarm current to all the alarms 12 in the district circuit 24.

  The district circuits 24-1 to 24-N detect that the sensing current has been sensed when the detector 11 detects that the sensing current has flowed from the first wiring L1 side to the second wiring L2 side. The main control unit 26 may be notified of the indicated information and the information for specifying the area where the fire was detected. The information for specifying the district is, for example, a district identification number. In this case, out of the district circuits 24-1 to 24-N, the district circuit 24 that has detected that the sensor 11 has flowed the sensing current sends the alarm circuit 12 based on the instruction from the main control unit 26. Provides alarm current. The local circuits 24-1 to 24-N are connected to the main control unit 26 when the sensor 11 detects that the sensing current has flowed in any one of the local circuits 24-1 to 24-N. Based on the instruction from, all or predetermined arbitrary regional circuits 24-1 to 24-N may supply an alarm current to the alarm device 12.

  The storage unit 25 includes, for example, a ROM (Read Only Memory) and a RAM (Random Access Memory). The storage unit 25 stores various programs and various data for causing the main control unit 26 to function. The main control unit 26 is configured by, for example, a CPU (Central Processing Unit).

  The main control unit 26 executes various functions by executing various programs stored in the storage unit 25. The main control unit 26 causes the display unit 22 to display the area where the fire was detected when the information specifying the area where the fire was detected was notified by the area circuits 24-1 to 24-N. When the main control unit 26 receives a notification from the district circuit 24 that the sensing current has been sensed, the main control unit 26 instructs the district circuit 24 that has sensed the fire to supply an alarm current.

  With the configuration described above, in the fire alarm system S, the wiring for connecting the sensor 11 to the control device 2 and the wiring for connecting the alarm device 12 to the control device 2 can be shared. Therefore, in the fire alarm system S, the work of laying the wiring of the district facilities 1-1 to 1-N can be simplified. In the fire alarm system S, the amount of wiring can be reduced.

[Composition of district circuit]
FIG. 2 is a diagram showing a configuration of the district circuit 24. The local circuit 24 includes a detection unit 241, a current generation unit 242, a changeover switch 243, and a sub control unit 244.

  The detection unit 241 is connected to the first wiring L1 and the second wiring L2 via the changeover switch 243 in a monitoring state in which the detection unit 241 is connected to the first wiring L1 and the second wiring L2. The detection unit 241 applies a voltage for flowing a current from the first wiring L1 side to the second wiring L2 side in the monitoring state, and the detector 11 detects the sensing current from the first wiring L1 side to the second wiring L2 side. Is detected as to whether or not it has flowed. More specifically, the detection unit 241 detects a potential difference between the first wiring L1 and the second wiring L2, and determines whether the detected potential difference is larger than a threshold. When the sensor 11 conducts the sensing current, the first wiring L1 and the second wiring L2 are almost short-circuited. For this reason, when the potential difference between the first wiring L1 and the second wiring L2 is equal to or smaller than the threshold, the detection unit 241 determines that the sensor 11 has passed the sensing current.

  On the other hand, when the potential difference between the first wiring L1 and the second wiring L2 is larger than the threshold, the detecting unit 241 determines that the sensor 11 is not passing a sensing current. The threshold value is, for example, the potential difference between the first wiring L1 and the second wiring L2 when the sensor 11 detects a fire, and the first wiring L1 and the second wiring when the sensor 11 does not detect a fire. It is an intermediate value with the potential difference between L2. The detection unit 241 outputs a detection result of the sensing current to the sub control unit 244.

  The current generator 242 is connected to the first wiring L1 and the second wiring L2 via the switch 243 in the alarm state. The current generator 242 is, for example, a DC power supply. Under the control of the sub-control unit 244, the current generation unit 242 moves from the second wiring L2 side to the first wiring L1 side in an alarm state in which the current generation unit 242 is connected to the first wiring L1 and the second wiring L2. Flow alarm current.

  The changeover switch 243 switches between a monitoring state and an alarm state under the control of the sub control unit 244. The connection in the monitoring state of the changeover switch 243 is shown by a solid line in FIG. 2, and the connection in the alarm state is shown by a broken line in FIG. The changeover switch 243 includes, for example, a field effect transistor (FET).

  In the example of FIG. 2, the changeover switch 243 switches between the monitoring state and the alarm state based on the control signal generated by the sub control unit 244. However, the present invention is not limited to this. For example, the changeover switch 243 may switch between a monitoring state and an alarm state based on a control signal generated by the main control unit 26, and may switch between the monitoring state and the alarm state by a user's operation input to the operation unit 21. You may.

  The sub control unit 244 is configured by, for example, a CPU. The sub-control unit 244 executes various functions by executing a program stored in a storage unit (not shown). When the detection unit 241 detects that the sensor 11 has flowed the sensing current from the first wiring L1 side to the second wiring L2 side, the sub control unit 244 sets the first wiring L1 from the second wiring L2 side. An alarm current is supplied to the alarm device 12 toward the side.

  More specifically, the sub control unit 244 controls the changeover switch 243 to switch from the monitoring state to the alarm state when the detection unit 241 detects that the sensing current has flowed in the monitoring state. The sub control unit 244 supplies an alarm current from the current generation unit 242 to the alarm device 12 by switching the changeover switch 243. The sub-control unit 244 performs main control of information indicating that the sensing current has been sensed when the sensor 11 has caused the sensing current to flow in the monitoring state, and information for specifying an area corresponding to the sub-control unit 244. Notify section 26. The information for specifying the district is, for example, a district identification number.

[Configuration of sensor]
FIG. 3 is a diagram illustrating a configuration of the sensor 11. The sensor 11 includes a fire detection unit 111, a level conversion circuit 112, a fire determination circuit 113, a switching circuit 114, a power supply circuit 115, and a rectification circuit 116.

  The fire detection unit 111 is a sensor for detecting smoke or heat of a fire. For example, the fire detection unit 111 detects, using a light receiving element, reflected light in which light emitted from a light source is irregularly reflected by smoke particles. The fire detection unit 111 outputs a detection signal indicating the detection result to the level conversion circuit 112.

  The level conversion circuit 112 amplifies the detection signal output by the fire detection unit 111. Specifically, the level conversion circuit 112 converts the detection signal into an output signal having a potential suitable for the fire judgment circuit 113 to judge a fire.

  The fire determination circuit 113 determines whether a fire has occurred. The fire determination circuit 113 determines whether or not a fire has occurred by determining whether or not the potential of the output signal input from the level conversion circuit 112 is higher than a threshold. The threshold value is, for example, a value corresponding to the smoke density determined by the Fire Service Law as a fire. The fire determination circuit 113 determines that a fire has occurred when the potential of the output signal is higher than the threshold. On the other hand, when the potential of the output signal is equal to or lower than the threshold, the fire determination circuit 113 determines that a fire has not occurred. The fire judgment circuit 113 notifies the switching circuit 114 of the judgment result.

  The switching circuit 114 supplies a sensing current based on the determination result of the fire determination circuit 113. The switching circuit 114 includes, for example, a semiconductor element such as a thyristor or a transistor inside, and switches between an ON state in which a sensing current flows and an OFF state in which a sensing current does not flow. The switching circuit 114 shifts from the off state to the on state when the fire determination circuit 113 determines that a fire has occurred. The switching circuit 114 turns on an operation lamp (not shown) in the ON state. On the other hand, when the fire determination circuit 113 determines that a fire has not occurred, the switching circuit 114 does not shift to the on state without being in the off state and does not turn on the operating lamp.

  The switching circuit 114 may be configured to switch between an on state in which a sensing current flows and an off state in which a sensing current does not flow, for example, using a bimetal for detecting heat of fire. In this case, the switching circuit 114 is configured integrally with the fire detection unit 111, and the sensor 11 does not include the level conversion circuit 112 and the fire determination circuit 113.

  The power supply circuit 115 converts the voltage output from the rectifier circuit 116 into rated voltages of the fire detection unit 111, the level conversion circuit 112, and the fire determination circuit 113, and supplies the converted voltage to these circuits. The power supply circuit 115 is, for example, a DC / DC converter or a regulator.

  The rectifier circuit 116 has the same voltage both when the current flows from the first wiring L1 to the second wiring L2 and when the current flows from the second wiring L2 to the first wiring L1. Is a diode bridge circuit for rectifying so as to generate the following.

[Bypass circuit]
The local circuits 24-1 to 24-N switch the connection state of the changeover switch 243 when detecting that the sensor 11 has flowed the sensing current from the first wiring L1 side to the second wiring L2 side. As a result, the sensing current is stopped, and an alarm current flows in the area where the sensing current is detected. At this time, the current limiting circuit 14 limits the flow of the alarm current into the sensor 11. If the current is not supplied to the sensor 11, the ON state of the sensor 11 is not maintained, and the operating lamp that is turned on after detecting the occurrence of a fire is turned off. Therefore, the district facility 1 may include a bypass circuit 31 arranged in parallel with the current limiting circuit 14.

  FIG. 4 is a diagram illustrating a connection example of the bypass circuit 31. The bypass circuit 31 has a resistance element for flowing a part of the alarm current supplied from the local circuit 24 to the sensor 11. The bypass circuit 31 has one end connected to the second line L2 and the cathode of the diode included in the current limiting circuit 14, and the other end connected to the anode of the diode included in the current limiting circuit 14 and the rectifying circuit 116 of the sensor 11. It is connected to the two lines L2. The bypass circuit 31 may be arranged so that a part of the alarm current flows to some of the plurality of sensors 11 of the district facility 1. After the sensor 11 flows the sensing current, a part of the alarm current flows to the sensor 11 via the bypass circuit 31, so that the on state of the sensor 11 is maintained, and the sensor 11 flows the sensing current. Even after switching to the alarm state in which the alarm current flows later, the state in which the operation lamp is turned on can be maintained.

  FIG. 4 shows an example in which the current limiting circuit 14 and the bypass circuit 31 are connected outside the sensor 11. However, the present invention is not limited to this, and the current limiting circuit 14 and the bypass circuit 31 may be built in the sensor 11.

[Fire notification processing]
FIG. 5 is a flowchart illustrating an example of a processing procedure of fire notification by the fire notification system S. This processing procedure starts when the district circuit 24 is in the monitoring state. First, the sub control unit 244 determines whether a fire has occurred based on the detection signal detected by the detection unit 241 (S101). When determining that a fire has occurred (YES in S101), the sub control unit 244 shifts to a warning state in which the current generation unit 242 is connected to the first wiring L1 and the second wiring L2 by switching the changeover switch 243. (S102). At this time, the detection unit 241 is not connected to the first wiring L1 and the second wiring L2, so that the supply of the sensing current is stopped (S103).

  In this alarm state, the current generator 242 supplies an alarm current to the alarm 12 from the second wiring L2 side to the first wiring L1 side (S104). The alarm 12 issues an alarm for notifying the occurrence of a fire (S105), and ends the processing. When it is determined that the fire has not occurred in the determination of S101 (NO in S101), the sub control unit 244 repeats the determination of S101.

[Effect of fire alarm system S]
As described above, in the fire alarm system S of this embodiment, since both the sensor 11 and the alarm 12 are connected between the first wiring L1 and the second wiring L2, the sensor 11 and the alarm are used. The work of laying the wiring when attaching 12 can be simplified. Further, the amount of wiring required for these wirings can be reduced. Since the alarm device 12 issues an alarm on condition that the alarm current is supplied, it is possible to suppress an erroneous alarm being issued before the detector 11 detects a fire.

  In the present embodiment, an example of the P-type fire notification system in which the sub control unit 244 notifies the main control unit 26 that the sensor 11 has detected a fire has been described. However, the present invention is not limited to this. For example, the present invention is applicable to an R-type fire alarm system. In the case of the R-type fire alarm system, the district circuit 24 may be provided in the repeater.

  As described above, the present invention has been described using the embodiment. However, the technical scope of the present invention is not limited to the scope described in the above embodiment, and various modifications and changes can be made within the scope of the gist. For example, a specific embodiment of the distribution / integration of the apparatus is not limited to the above embodiment, and all or a part thereof can be configured to be functionally or physically distributed / integrated in an arbitrary unit. . In addition, a new embodiment generated by an arbitrary combination of a plurality of embodiments is also included in the embodiment of the present invention. The effect of the new embodiment caused by the combination has the effect of the original embodiment.

2 Controller 11 Sensor 12 Alarm 13 Termination circuit 14 Current limiting circuit 15 Current limiting circuit 21 Operation unit 22 Display unit 23 Power supply unit 24 District circuit 25 Storage unit 26 Main control unit 31 Bypass circuit 111 Fire detection unit 112 Level conversion circuit 113 Fire determination circuit 114 Switching circuit 115 Power supply circuit 116 Rectifier circuit 241 Detector 242 Current generator 243 Switch 244 Sub-controller L1 First wiring L2 Second wiring S Fire alarm system

Claims (8)

A sensor that detects a fire, an alarm that issues an alarm, and a control device that is connected to the sensor and the alarm via first and second wirings,
The sensor is connected between a first wiring and a second wiring, and when a fire is detected, flows a sensing current from the first wiring to the second wiring.
The alarm is connected between the first wiring and the second wiring, and issues an alarm on condition that an alarm current is supplied from the control device to the first wiring from the second wiring. Emit
The control device, when detecting that the sensor has flowed the sensing current from the first wiring side toward the second wiring side, from the second wiring side toward the first wiring side Supplying the alarm current to the alarm device;
Fire alarm system. The control device includes:
A detection unit that detects that the sensor has flowed the sensing current from the first wiring side toward the second wiring side;
A current generator that flows the alarm current from the second wiring side toward the first wiring side;
A changeover switch that switches between a monitoring state in which the detection unit is connected to the first wiring and the second wiring, and an alarm state in which the current generation unit is connected to the first wiring and the second wiring;
Having,
The fire alarm system according to claim 1. When the detection unit detects that the sensing current has flown, the control unit further controls the changeover switch to switch from the monitoring state to the alarm state.
The fire alarm system according to claim 2. A first current limiting circuit for limiting the flow of the alarm current to the sensor between the first wiring and the second wiring;
The fire alarm system according to any one of claims 1 to 3. In parallel with the first current limiting circuit, further includes a bypass circuit that allows a part of the alarm current to flow to the sensor.
The fire alarm system according to claim 4. The sensor further includes an operation light that lights when a fire is detected,
The bypass circuit, after the sensor has passed the sensing current, passes a current to the sensor to maintain a state in which the operating lamp is turned on.
The fire alarm system according to claim 5. A second current limiting circuit between the first wiring and the second wiring, the second current limiting circuit limiting current flowing from the first wiring side to the second wiring side to the alarm device;
The fire alarm system according to any one of claims 1 to 6. According to a fire notification method in a fire notification system including a sensor that detects a fire, an alarm that issues an alarm, and a control device that is connected to the sensor and the alarm via a first wiring and a second wiring. So,
Flowing the sensing current from the first wiring side to the second wiring side when the sensor connected between the first wiring and the second wiring detects a fire;
The controller detecting that the sensor has passed the sensing current from the first wiring side toward the second wiring side;
The control device, after the detecting step, supplying an alarm current to the alarm device from the second wiring side toward the first wiring side;
The alarm device connected between the first wiring and the second wiring issues an alarm on condition that an alarm current is supplied from the control device to the first wiring side from the second wiring side. Steps and
Fire alarm method to have.

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