JP5819711B2 - Fire alarm equipment and repeaters used for it - Google Patents

Description

The present invention relates to a repeater and a fire alarm facility.

For example, in a conventional fire alarm system, a fire receiver is installed in the central monitoring room, a line line and a common line are provided from the fire receiver, and the line line and the common line are connected via a terminating resistor. (For example, refer to Patent Document 1).

JP-A-6-176289

According to the technique described in Patent Document 1, when a failure occurs in a fire detector, a fire receiver, for example, a P-type receiver, receives that fact and cannot control an alarm or a display.
In addition, by providing a self-inspection function that outputs to the fire receiver that a failure has occurred in the fire detector, to display whether the fire detector has failed or not, the fire receiver can receive a dedicated fire receiver. There was a problem that it had to be replaced with a machine (for example, R type).

  The present invention has been made to solve the above-described problems, and it is possible to notify a failure occurring in a fire detector even with a fire receiver that is not a dedicated fire receiver, without replacing an existing fire receiver. It aims at providing the fire alarm equipment and the repeater used for it.

This onset Ming, a sensor line connected to the fire receiver comprising a common line and the line wire, one for outputting a fire signal to the sensor lines by the connected switching operation the sensing device line or a plurality of fire sensors In a fire alarm facility comprising a detector and a repeater connected to the detector circuit and interposed between the fire receiver and the fire detector, the fire detector is an inspection means for detecting its own defects by self-inspection. And an output means for outputting an abnormal signal to the sensor line when there is a defect based on the result of the inspection means, and the repeater receives the abnormal signal and the fire signal output from the fire detector. A disconnection generating means for disconnecting a sensor line between the repeater and the fire receiver by switching the contact, and a disconnector and a repeater, fire And a power supply means for supplying power to the sensor lines between the known devices, the fire receiver is obtained with a break alarm onset report means for emitting break alarm when the sensor lines is broken.

  The repeater according to the present invention is interposed between a fire receiver connected to the sensor line and a fire detector that outputs a fire signal to the sensor line by a switching operation, and is connected to the sensor line. Based on the result of the self-inspection of the fire detector, the receiving means for receiving the abnormal signal output in the event of a malfunction and the fire detection based on the result of the abnormal signal of the fire detector received by the receiving means When the detector is defective, it comprises a judgment means for outputting a contact switching signal and two contact switching means having a common line of the sensor line and a contact interposed in the line line. When the contact switching signal is received, Disconnection generating means for disconnecting a sensor line between the repeater and the fire receiver by switching contacts, and a power supply means for supplying power to the sensor line between the repeater and the fire detector while disconnecting It is those with a.

According to the fire alarm facility according to the present invention, the disconnection generating means provided in the repeater disconnects the sensor line when receiving an abnormal signal of the fire detector output from the fire sensor to the sensor line, The disconnection alarm issuing means issues a disconnection alarm when the sensor line is disconnected. Thereby, even if the fire alarm facility according to the present invention is not a dedicated fire receiver, it is possible to notify the malfunction of the fire detector with the existing fire receiver without renewing the fire receiver.

  According to the repeater according to the present invention, when an abnormal signal indicating a failure is received from the fire detector, the contact between the common line and the line line is switched to detect the sensor between the repeater and the fire receiver. Since the line is disconnected, even if it is not a dedicated fire receiver, the existing fire receiver can be used to notify the failure of the fire detector without renewing the fire receiver.

It is a general | schematic block diagram of the fire alarm equipment which concerns on this invention. It is a structure of the control circuit of the fire detector shown in FIG. It is a structure of the control circuit of the repeater shown in FIG. (A) shows the voltage of the sensor line during normal times and fires, and (b) shows the voltage of the sensor line during normal times and when a failure occurs.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a fire alarm facility 100 according to Embodiment 1 of the present invention. In FIG. 1, the case where the three fire detectors 2 are provided and the termination resistance R as a termination element is provided is illustrated as an example. Here, the number of fire detectors 2 is not limited thereto.

  The fire alarm system 100 includes a fire detector 2 installed in each room of a building, a fire receiver 1 that gives an alarm based on a detection result of the fire detector 2, a fire detector 2 and a fire receiver A repeater 6 interposed between the machine 1 and the machine 1 is connected by a sensor line 5 including a common line 3 and a line 4. Hereinafter, what is referred to as the sensor line 5 is a combination of the common line 3 and the line line 4.

[Configuration of the fire alarm system 100]
The fire alarm facility 100 will be described with reference to FIG.

  The fire receiver 1 is a P-type receiver, and one or a plurality of fire detectors 2 are connected via a common line 3 and a line line 4. The P-type fire receiver is an electrical device such as a voltage of the sensor line 5 that is generated when the electrical contact of the fire sensor 2 connected to the sensor line 5 including the common line 3 and the line line 4 is closed. The fire is judged based on the change. The fire receiver 1 is provided with a speaker for notifying a fire by voice, a lamp for notifying by a display, and the like. Further, the fire receiver 1 is provided with a disconnection alarm generating means for notifying that a disconnection alarm is generated by voice or a lamp even when the sensor line 5 is disconnected. The fire receiver 1 is installed in a central management room such as a building disaster prevention center. And the fire and disconnection which the fire receiver 1 detected are alert | reported in a disaster prevention center.

  When the fire detector 2 detects heat, smoke, flame, etc. generated by the flame, the fire detector 2 outputs a fire signal, which is a signal indicating that a fire has been detected, to the fire receiver 1 via the sensor line 5. The fire signal of the fire detector 2 is, for example, a signal that reduces the impedance of the sensor line 5 by the switching operation of the fire detector 2.

  The fire detector 2 detects its own malfunction such as an output value abnormality by the output value monitoring method. In addition, the output value monitoring method is how much the output value when the fire detector 2 does not detect a fire changes with respect to the output value when the fire detector 2 is initially installed. This is a method of detecting and detecting a malfunction of the fire detector 2. The fire detector 2 is connected to the fire receiver 1 via a sensor line 5 so as to be connected in parallel by a so-called feed wiring system.

  The repeater 6 is interposed between the fire receiver 1 and the plurality of fire detectors 2 and is provided on the detector line 5. The repeater 6 is connected to a power supply device 8 which is a power supply means. At the time of fire monitoring (normal time), the repeater 6 receives power supply from the fire receiver 1 and does not receive power supply from the power supply device 8. The power supply means is not limited to the power supply device 8 and may be any device that can supply power, such as a commercial power supply.

The terminating resistor R is located at the end of the sensor line 5 connected by a so-called feed wiring system, and is a resistor that connects the common line 3 and the line line 4. The fire receiver 1 monitors the disconnection of the sensor line 5 by a weak current flowing through the sensor line 5 by the terminating resistor R.
The sensor line 5 includes a common line 3 and a line line 4 and connects the fire receiver 1, the fire detector 2, and the repeater 6. The fire detectors 2 are connected to the common line 3 and the line 4 so as to have a parallel connection relationship by a so-called feed wiring system. The common line 3 and the line line 4 constitute one line as a set. That is, for example, if the common line 3 is shared from the fire receiver 1 and a plurality of line lines 4 are drawn out to form a plurality of lines, a fire signal can be received for each line.

[Composition of fire detector 2]
FIG. 2 shows an example of the configuration of the control circuit 50 of the fire detector 2. The configuration of the control circuit 50 of the fire detector 2 will be described with reference to FIG.

  The control circuit 50 of the fire detector 2 includes a detection circuit 14 and a determination circuit 13 and includes inspection means for detecting a self-failure by self-inspection. Further, there are a constant voltage circuit 11 that supplies a constant voltage to a necessary circuit, a switching circuit 12 that connects the common line 3 and the line line 4 to bring the sensor line 5 into a low impedance state, and that there is a problem with the external. It further has an operation indicator lamp 17 which is a display means for displaying and identifying.

  The constant voltage circuit 11 converts a power supply voltage supplied via the sensor line 5 into a predetermined voltage value, for example, 5 (V), and supplies it to a necessary circuit. As shown in FIG. 2, the constant voltage circuit 11 is connected to the determination circuit 13 and the detection circuit 14 and supplies an operating voltage thereto. The constant voltage circuit 11 is composed of, for example, a constant voltage IC.

  The detection circuit 14 detects heat, smoke, flame, and the like generated by a fire and outputs a detection result. It consists of elements necessary for detection, an amplifier circuit, and the like. The detection circuit 14 is connected to the determination circuit 13.

  The determination circuit 13 determines the level of the output of the detection circuit 14 to determine whether or not there is a fire, and based on the determination result, the fire signal is sent to the fire receiver 1 via the sensor line 5. The switching circuit 12 is controlled so as to output. The determination circuit 13 controls the operation indicator lamp 17 to be lit when it is determined that there is a fire.

  The discrimination circuit 13 detects a malfunction of the fire detector 2 by the output value monitoring method, and outputs an abnormal signal to the sensor line 5 when the detection circuit 14 determines that the output value is abnormal as a result of detection. The switching circuit 12 is controlled. In addition, the method in which the detection circuit 14 detects the malfunction of the fire detector 2 may be a method in which heat or light is simulated by itself as a pseudo output method. In other words, the discrimination circuit 13 receives the detection output from the detection circuit 14 and discriminates the fire and the malfunction of the fire detector 2 itself by level judgment or the like. The discriminating circuit 13 is composed of, for example, a microprocessor.

  The switching circuit 12 is closed when the determination circuit 13 determines that there is a fire, and outputs a fire signal to the sensor line 5. That is, if the discrimination circuit 13 discriminates that there is a fire, it outputs a signal indicating that the switching circuit 12 is closed, and the switching circuit 12 receiving the output maintains the sensor line 5 in a low impedance state. The fact that the switching circuit 12 maintains the sensor line 5 in a low impedance state is a fire signal from the fire sensor 2 to the fire receiver 1. Low impedance means that the impedance is lower than the impedance of the sensor line 5 in a state where no fire has occurred. The switching circuit 12 is connected to the discrimination circuit 13 and the sensor line 5. Note that the switching circuit 12 is configured by, for example, a transistor.

  Further, when the determination circuit 13 determines that the fire detector 2 itself has a problem, the switching circuit 12 outputs a pulse-like voltage change to the detector line 5 as described later. That is, when the fire detector 2 is defective, the switching circuit 12 makes the detector line 5 in a low impedance state in a pulsed manner.

  The operation indicator lamp 17 is controlled to be turned on or blinked based on the output of the determination circuit 13 in the event of a fire or when the fire detector 2 itself is defective. The operation indicator lamp 17 is connected to the determination circuit 13 and the line line 4. The operation indicator lamp 17 may be a light emitting element such as an LED.

  The common line connection portion 3A is connected to the common line 3, and the line line connection portion 4A is a connection portion to which the line line 4 is connected. The fire detector 2 is provided between the common line 3 and the line line 4, and the control circuit 50 of the fire detector 2 is provided between the common line connection part 3A and the line line connection part 4A for electrical connection. It will be.

[Configuration of repeater 6]
FIG. 3 shows an example of the configuration of the control circuit 40 of the repeater 6. The configuration of the control circuit 40 of the repeater 6 will be described with reference to FIG.

  The control circuit 40 of the repeater 6 includes a receiving circuit 22, contact switching circuits 25 and 26, a power supply circuit 21, and a constant voltage circuit 24.

  The constant voltage circuit 24 sets a power supply voltage supplied to the control circuit 40 of the repeater 6 to a predetermined voltage, for example, 5 V, and supplies it to a necessary circuit. The constant voltage circuit 24 is configured by, for example, a low voltage IC.

  The contact switching circuit 25 has a contact interposed in the common line 3, and the contact switching circuit 26 has a contact interposed in the line line 4. The contact switching circuits 25 and 26 have contacts at two positions, contacts 25a and 26a at the fire monitoring position and contacts 25b and 26b at the disconnection position. The contact point 25 a at the fire monitoring position is connected to the common line 3, and the contact point 26 a at the fire monitoring position is connected to the line line 4. The contacts 25 b and 26 b at the disconnection position are connected to the power supply device 8. When the contact switching circuits 25 and 26 close the contacts 25a and 26a at the fire monitoring position, the fire receiver 1 and the fire detector 2 are connected via the repeater 6. On the other hand, when the contact switching circuits 25 and 26 close the disconnected contacts 25b and 26b, the fire receiver 1 and the fire detector 2 are not connected, and the power supply device 8 and the fire detector 2 are connected via the repeater 6. Connected. That is, the contact switching circuits 25 and 26 constitute disconnection generating means for disconnecting the sensor line 5 between the repeater 6 and the fire receiver 1. The contact switching circuits 25 and 26 are controlled by the output of the determination circuit 23.

  The receiving circuit 22 includes receiving means for receiving a fire signal and an abnormal signal output from the fire detector 2 to the detector line 5. When the reception circuit 22 receives a fire signal or an abnormal signal, the reception circuit 22 outputs a signal to the determination circuit 23.

  The determination circuit 23 controls the entire repeater 6, and is constituted by, for example, a microprocessor. When the determination circuit 23 receives a signal to that effect from the reception circuit 22 that has received the abnormal signal of the fire detector 2, the determination circuit 23 connects the contact switching circuits 25 and 26, which are disconnection generating means, from the contacts 25a and 26a at the fire monitoring position. Control is performed so as to switch to the contacts 25b and 26b at the disconnection position, and the sensor line 5 is disconnected.

  When the discrimination circuit 23 receives the signal indicating the fire signal from the receiving circuit 22 when the sensor circuit 5 is disconnected by switching the contacts of the contact switching circuits 25 and 26, the contact of the contact switching circuits 25 and 26 is received. Is controlled to return from the contacts 25b and 26b at the disconnection position to the contacts 25a and 26a at the fire monitoring position.

  The power supply circuit 21 is connected to the power supply device 8. When the contacts 25a and 26a at the fire monitoring position are closed, the power supply circuit 21 is not connected to the sensor line 5. When the contact switching circuits 25 and 26 are switched to the contact points 25b and 26b at the disconnection position, power is supplied from the repeater 6 to the sensor line 5 at the end, so that the fire detector 2 operates normally.

  The common line connection portion 3B is a connection portion that is connected so that the common line 3 is drawn in and the common line connection portion 3C is drawn out. Further, the line line connection portion 4B is a connection portion that is connected so that the line line 4 is drawn in, and the line line connection portion 4C is drawn out. As an electrical connection, the control circuit 40 of the repeater 6 is provided between the common line connection parts 3B and 3C and the line line connection parts 4B and 4C.

[Description of operation]
With reference to FIG. 1 thru | or FIG. 3, the operation example of the fire alerting | reporting equipment 100 when there exists a malfunction in the fire detector 2 is demonstrated.

  Each fire detector 2 performs fire discrimination at predetermined intervals during fire monitoring. At the time of this fire monitoring, each fire detector 2 also determines whether or not it has a defect by the output value monitoring method. Further, the contact switching circuits 25 and 26 of the repeater 6 have the contacts 25a and 26a at the fire monitoring position closed, and the repeater 6 is supplied with power from the fire receiver 1.

  First, when there is a malfunction in the output value abnormality of each fire detector 2, the discrimination circuit 13 of the control circuit 50 of the fire detector 2 turns on or blinks the operation indicator lamp 17. The operation indicator lamp 17 is lit or blinked to notify the user which fire detector 2 has a defect in appearance. Further, the determination circuit 13 controls the switching circuit 12 to be turned ON / OFF at a constant cycle simultaneously with the control of lighting or blinking of the operation indicator lamp 17 to change the voltage of the sensor line 5 in a pulse manner. As a result, an abnormal signal is output to the sensor line 5.

  Next, when the receiving circuit 22 of the repeater 6 that constantly monitors the sensor line 5 receives the abnormal signal output from the fire detector 2, the contact switching signal is sent from the discrimination circuit 23 to the contact switching circuits 25 and 26. Is output. Then, the contact switching circuits 25 and 26 in which the contacts 25a and 26a at the fire monitoring position are closed are simultaneously switched to the contacts 25b and 26b at the disconnection position and closed. When the contact point is switched to the contact points 25b and 26b at the disconnection position, the connection between the repeater 6 and the fire receiver 1 is disconnected and a disconnection occurs. Since the power supply circuit 21 of the repeater 6 connected to the power supply device 8 and the sensor line 5 on the rear stage side of the repeater 6 are connected, the fire detector 2 is connected from the power supply device 8 via the sensor line 5. Is supplied with power. In other words, each fire detector 2 is disconnected from the fire receiver 1, but operates normally since power is supplied from the power supply device 8. Connection to the power supply circuit 21 may be performed by drawing a power supply line for power supply different from the detector line 5 from the fire receiver 1 instead of the power supply device 8. Here, the downstream side of the sensor line 5 is a line to which the fire detector 2 up to the repeater 6 and the terminating resistor R is connected.

  Next, when the fire receiver 1 detects the disconnection of the sensor line 5 by the switching of the contacts of the contact switching circuits 25 and 26, the disconnection display by the panel which is the disconnection alarm issuing means of the fire receiver 1 and the disconnection alarm by sound Perform a disconnection alarm at. At this time, the user uses the disconnection alarm issuing means of the fire receiver 1 so that the sensor line 5 is really disconnected or there is a malfunction in either the fire sensor 2 connected to the sensor line 5. I can know that. In addition, when there is a malfunction in the fire detector 2, the fire monitoring position contact 25a and the disconnection position contact 25b, the fire monitoring position contact 26a and the disconnection position contact 26b of the contact switching circuits 25 and 26 are intermittently the same. By switching at the timing, it is possible to notify the user who has confirmed the disconnection alarm issuing means that the failure is not the disconnection of the sensor line 5, but the failure of the fire detector 2 connected to the sensor line 5. it can.

  Finally, when the fire detector 2 disconnected from the fire receiver 1 and receiving power from the repeater 6 detects a fire, the detector circuit 5 is controlled by the switching circuit 12 controlled by the discrimination circuit 13. A fire signal is output that sets the low impedance state. When the receiving circuit 22 of the repeater 6 receives the fire signal, the determination circuit 23 outputs a contact switching signal to the contact switching circuits 25 and 26. Then, the contacts of the contact switching circuits 25 and 26 are switched from the contacts 25b and 26b at the disconnection position to the contacts 25a and 26a at the fire monitoring position, and the disconnection state of the fire receiver 1 is restored. The fire receiver 1 recovered from the disconnection state can notify the fire by sound from a speaker or blinking of a lamp based on a fire signal output from the fire detector 2 to the detector line 5.

[Fire signal and abnormal signal]
FIG. 4A shows the voltage of the sensor line 5 during normal times and fires, and FIG. 4B shows the voltage of the sensor line 5 during normal times and when a failure occurs. An example of a fire signal and an abnormal signal will be described with reference to FIG.

  The fire signal output from the fire detector 2 changes the voltage value to, for example, about 8 (V) when the voltage value of the normal sensor line 5 without fire is set to, for example, about 24 (V). Let me configure.

  The abnormal signal output from the fire detector 2 is configured by changing the voltage in a pulsed manner a predetermined number of times at a short interval from about 24 (V) of the detector line 5 when there is no fire (normal time). It is advisable to use a signal. The pulse-like voltage may be changed to about 8 (V) as in the case of the fire signal. However, the voltage is not limited to this value, and any voltage can be used as long as the receiving circuit 22 can determine that it is an abnormal signal. In FIG. 4, the predetermined number of times is shown as an example. Thereby, even if the discrimination circuit 23 of the repeater 6 cannot catch the first voltage change, the discrimination circuit 23 can surely confirm whether this voltage change is an abnormal signal by the second voltage change. . Therefore, the predetermined number of times may be set to 2 or more.

[Effect of fire alarm system 100]
The fire alarm system 100 according to the first embodiment includes a contact switching circuit that is provided in the repeater 6 and interposed between the common line 3 and the line line 4 when the repeater 6 receives an abnormal signal from the fire detector 2. The contact of 25 and 26 is switched, the sensor line 5 is disconnected, and the disconnection alarm issuing means of the fire receiver 1 notifies the disconnection of the sensor line 5 with a disconnection alarm. Thereby, even if it is a P-type fire receiver 1, the disconnection of the sensor circuit | line 5 can be detected as an abnormal signal of the fire sensor 2, and the malfunction of the fire sensor 2 can be known. That is, the fire alarm system 100 according to the first embodiment notifies the malfunction of the fire detector 2 even in the fire receiver 1 that is not a dedicated fire receiver that can receive and control the result of the self-inspection of the fire detector 2. can do.

  The fire alarm system 100 according to the first embodiment is effective, for example, when renewing a P-type fire alarm system already installed in a building. That is, the fire alarm system 100 can be obtained by interposing the relay 6 between the fire receiver 1 and the fire detector 2 of the P-type fire alarm system already provided in the building. Rather than using the fire receiver 1 of the P-type fire alarm system already installed in the building as a dedicated fire receiver (for example, R type), the existing fire detector is the fire detector 2 of the present invention and relayed. The provision of the vessel 6 can be carried out at a lower cost.

Embodiment 2. FIG.
In the second embodiment, a case will be described in which the configuration is the same as that of the above-described first embodiment, but the operation is different. In the second embodiment, differences from the first embodiment will be described in detail, and members corresponding to the first embodiment are given the same reference numerals and description thereof is omitted. Furthermore, the configuration of the fire alarm system 100, the configuration of the fire detector 2, and the configuration of the repeater 6 are the same as those in the first embodiment described above, and will be omitted.

[Description of operation]
With reference to FIG. 1 thru | or FIG. 3, the operation example of the fire alerting | reporting equipment 100 when there exists a malfunction in the fire detector 2 is demonstrated.

  Each fire detector 2 performs fire discrimination at predetermined intervals during fire monitoring. At the time of this fire monitoring, each fire detector 2 also determines whether or not it has a defect by the output value monitoring method. Further, the contact switching circuits 25 and 26 of the repeater 6 have the contacts 25a and 26a at the fire monitoring position closed, and the repeater 6 is supplied with power from the fire receiver 1.

  First, when there is a malfunction in the output value abnormality of each fire detector 2, the discrimination circuit 13 of the control circuit 50 of the fire detector 2 turns on or blinks the operation indicator lamp 17. Further, the determination circuit 13 controls the switching circuit 12 to be turned ON / OFF at a constant cycle simultaneously with the control of lighting or blinking of the operation indicator lamp 17 to change the voltage of the sensor line 5 in a pulse manner. As a result, an abnormal signal is output to the sensor line 5.

  Next, when the receiving circuit 22 of the repeater 6 that constantly monitors the sensor line 5 receives the abnormal signal output from the fire detector 2, the contact switching signal is sent from the discrimination circuit 23 to the contact switching circuits 25 and 26. Is output. Then, the contact switching circuits 25 and 26 closing the contacts 25a and 26a at the fire monitoring position simultaneously switch the contacts to the contacts 25b and 26b at the disconnection position and close them. When switching to the contacts 25b and 26b at the disconnection position, the connection between the repeater 6 and the fire receiver 1 is disconnected and a disconnection occurs.

  Next, when the fire receiver 1 detects the disconnection of the sensor line 5 by the switching of the contacts of the contact switching circuits 25 and 26, the disconnection display by the panel which is the disconnection alarm issuing means of the fire receiver 1 and the disconnection alarm by sound Perform a disconnection alarm at. At this time, the user uses the disconnection alarm issuing means of the fire receiver 1 so that the sensor line 5 is really disconnected or there is a malfunction in either the fire sensor 2 connected to the sensor line 5. I can know that. In addition, when there is a malfunction in the fire detector 2, the fire monitoring position contact 25a and the disconnection position contact 25b, the fire monitoring position contact 26a and the disconnection position contact 26b of the contact switching circuits 25 and 26 are intermittently the same. By switching at the timing, it is possible to notify the user who has confirmed the disconnection alarm issuing means that the failure is not the disconnection of the sensor line 5, but the failure of the fire detector 2 connected to the sensor line 5. it can.

  Finally, the discrimination circuit 23 of the repeater 6 that has switched the contacts of the contact switching circuits 25 and 26 to the contacts 25b and 26b at the disconnection position is the time when the fire receiver 1 can detect the disconnection when the contact switching signal is output. Then, the output of the contact switching signal is stopped, the contacts of the contact switching circuits 25 and 26 are restored to the contacts 25a and 26a at the fire monitoring position, and the sensor line 5 is restored as usual. At this time, the fire receiver 1 holds the disconnection display. For example, if the fire receiver 1 can detect a disconnection within 5 seconds after the sensor line 5 is disconnected, the determination circuit 23 of the repeater 6 connects the contact switching circuits 25 and 26 to the contact 25b at the disconnection position. 10 seconds after switching to and 26b, the sensor line 5 may be restored by switching to the contacts 25a and 26a at the fire monitoring position. With this operation, the fire alarm system 100 can detect a fire even after the operation of detecting the malfunction of the fire detector 2. That is, even if the detector line 5 is disconnected due to a malfunction of the fire detector 2, the contact of the contact switching circuits 25 and 26 is restored to the contacts 25a and 26a at the fire monitoring position after the fire receiver 1 detects the disconnection. The sensor line 5 is restored as usual. Therefore, when a fire is detected, the fire detector 2 can output a fire signal to the fire receiver 1 via the sensor line 5. And the fire receiver 1 can alert | report a fire by the audio | voice from a speaker or blink of a lamp | ramp based on the output fire signal.

  In addition, after the sensor line 5 is restored, the operation indicator lamp 17 of the fire detector 2 is preferably kept lit or flashing when there is a malfunction. This holding is preferably continued until there is an operation from the user.

  In the above description of the operation, the case of the fire receiver 1 that can maintain the disconnection display even when the sensor line 5 is restored has been described. However, there is also a fire receiver 1 that is restored when the sensor line 5 is restored. In the fire receiver 1, as described above, after the contact switching signal output time exceeds the time that the fire receiver 1 can detect the disconnection, the contacts of the contact switching circuits 25 and 26 are connected to the fire monitoring position contact 25a. And when it is restored to 26a, the fire receiver 1 cannot report the disconnection. In the case of such a fire receiver 1, the contacts of the contact switching circuits 25 and 26 are switched intermittently. That is, when the contacts of the contact switching circuits 25 and 26 are the contacts 25a and 26a at the fire monitoring position, the power is supplied from the fire receiver 1 to monitor the fire, and when the contacts are the contacts 25b and 26b at the disconnection position, The fire receiver 1 sounds a disconnection alarm and receives power from the power supply 8 to switch the contacts of the contact switching circuits 25 and 26 from the contacts 25b and 26b at the disconnection position to the contacts 25a and 26a at the fire monitoring position. .

  While the contact switching circuits 25 and 26 are in a normal connection state, a fire alarm is not issued from the fire receiver 1 and fire monitoring is performed. While the contacts of the contact switching circuits 25 and 26 are disconnected, a fire alarm is sounded from the fire receiver 1. By intermittently sounding the disconnection alarm, the user can know that the fire detector 2 is defective. The intermittent switching of the contacts of the contact switching circuits 25 and 26 is preferably continued until the user notices the sound of the fire receiver 1 and operates the sound stop switch or the like.

[Effect of fire alarm system 100]
The fire alarm system 100 according to the first embodiment includes a contact switching circuit that is provided in the repeater 6 and interposed between the common line 3 and the line line 4 when the repeater 6 receives an abnormal signal from the fire detector 2. The contact of 25 and 26 is switched, the sensor line 5 is disconnected, and the disconnection alarm issuing means of the fire receiver 1 notifies the disconnection of the sensor line 5 with a disconnection alarm. Thereby, even if it is a P-type fire receiver 1, the disconnection of the sensor circuit | line 5 can be detected as an abnormal signal of the fire sensor 2, and the malfunction of the fire sensor 2 can be known. That is, the fire alarm system 100 according to the first embodiment notifies the malfunction of the fire detector 2 even in the fire receiver 1 that is not a dedicated fire receiver that can receive and control the result of the self-inspection of the fire detector 2. can do.

  The fire alarm system 100 according to the first embodiment is effective, for example, when renewing a P-type fire alarm system already installed in a building. That is, the fire alarm system 100 can be obtained by interposing the relay 6 between the fire receiver 1 and the fire detector 2 of the P-type fire alarm system already provided in the building. Rather than using a dedicated fire receiver (for example, R-type) as the fire receiver 1 of the P-type fire alarm system already installed in the building, the existing fire detector is the fire detector 2 and the repeater 6 is It can be implemented at a lower cost.

  Further, since the power supply device 8 is a power supply means only for switching the contacts of the switching circuits 25 and 26, the power supply device 8 can be made smaller than that of the first embodiment.

1 Fire Receiver, 2 Fire Detector, 3 Common Line, 3A, 3B, 3C Common Line Connection, 4 Line Line, 4A, 4B, 4C Line Line Connection, 5 Sensor Line, 6 Repeater, 8 Power Supply , 11 Constant voltage circuit, 12 Switching circuit, 13 Discrimination circuit, 14 Detection circuit, 17 Operation indicator lamp, 21 Power supply circuit, 22 Reception circuit, 23 Discrimination circuit, 24 Constant voltage circuit, 25 Contact switching circuit, 25a Fire monitoring position Contact, 25b Contact at disconnection position, 26 Contact switching circuit, 26a Contact at fire monitoring position, 26b Contact at disconnection position, 40 Control circuit, 50 Control circuit, 100 Fire alarm equipment, R Terminal resistance.

Claims (6)

A sensor line connected to a fire receiver and comprising a common line and a line; one or more fire detectors connected to the sensor line and outputting a fire signal to the sensor line by a switching operation; In a fire alarm facility comprising a relay connected to a detector line and interposed between the fire receiver and the fire detector,
The fire detector is a self-checking means for detecting a fault of the self,
Output means for outputting an abnormal signal to the sensor line when there is a defect based on the result of the inspection means;
The repeater is configured to receive the abnormal signal output from the fire detector and the fire signal ;
A disconnection generating means comprising a contact interposed between the common line and the line line in the repeater, and switching the contact to disconnect the sensor line between the repeater and the fire receiver,
Power supply means for supplying power to the sensor line between the repeater and the fire sensor while disconnecting,
The fire alarm equipment comprising a disconnection alarm notification means for issuing a disconnection alarm when the sensor line is disconnected.   2. The fire alarm system according to claim 1, wherein the power supply means obtains power through a power supply device or a power supply line different from the sensor line from the fire receiver.   The fire alarm system according to claim 1 or 2, wherein the fire detector includes display means for displaying and identifying that there is a defect on the outside based on a result of the inspection means.   The fire alarm system according to any one of claims 1 to 3, wherein the disconnection generating means intermittently disconnects the contacts interposed in the common line and the line line.   The receiving means recovers the disconnection caused by the disconnection generating means when receiving a fire signal from the fire detector even when the sensor line is disconnected by the disconnection generating means. The fire alarm system according to any one of claims 1 to 4. In a repeater connected between the fire receiver connected to the sensor line and the fire detector that outputs a fire signal to the sensor line by a switching operation, and connected to the sensor line,
Based on the result of the self-inspection of the fire detector, receiving means for receiving an abnormal signal output in the case of a malfunction;
Based on the result of the abnormal signal of the fire detector received by the receiving means, a determination means for outputting a contact switching signal when the fire detector is defective,
It comprises two contact switching means having a common line of the sensor line and a contact intervening in the line line. When the contact switching signal is received, the contact of the contact switching means is switched to switch between the repeater and the fire receiver. Disconnection generating means for disconnecting the sensor line between;
And a power supply means for supplying power to the sensor line between the relay and the fire sensor.