JP7332754B2 - Fire alarm equipment - Google Patents

Description

The present invention relates to a fire alarm system that monitors fire by connecting a smoke sensor to a transmission line from a receiver.

Conventionally, in a fire alarm system known as the R-type, a terminal device such as a smoke detector equipped with a transmission function is connected to a transmission line led out from a receiver. Based on the fire interrupt from, issue a search command to identify the address of the smoke sensor that issued the alarm, display the fire occurrence address, and collect and monitor the fire data from the identified smoke sensor. there is

In this way, knowing the address of the smoke detector that detected the fire enables appropriate evacuation guidance and fire extinguishing activities.

In such fire alarm equipment, periodic inspections are performed to confirm that the receiver and smoke detector operate normally. In the inspection of fire alarm equipment, a smoke test is conducted using a test jig to inject smoke into the smoke detection part of the smoke detector to check whether or not the alarm is triggered.

For the smoke test of the smoke detector, the test mode is set on the receiver, one tester is assigned to the receiver, and another tester uses a test jig for the smoke detector installed in the restricted area. When a smoke test is performed by adding smoke to the receiver, the smoke detector fires and sends a fire signal to the receiver, and the alarm is displayed. Check the normal operation of the machine.

In addition, the receiver that received the fire signal triggered by the alarm sends a lighting instruction signal to the smoke detector that triggered the alarm, the alarm indicator lamp of the alarmed smoke detector lights up, and the alarm indicator lamp turns on. The on-site tester confirms that the receiver is operating normally due to the alarm of the smoke detector, and repeats the work of moving to the installation place of the next smoke detector and conducting the smoke test.

A smoke detector whose warning indicator light is turned on by a smoke addition test receives a turn-off instruction signal from the receiver and turns off the warning indicator light when the smoke disappears with the passage of time and the smoke sensor recovers.

JP 2014-178936 A JP 2016-076064 A JP 2017-068523 A WO2016/203807 JP 2010-146448 A

By the way, if the smoke test of the smoke detector is continuously performed, the alarm indicator lamp that was lit by the smoke test will continue to light until the smoke from the smoke test disappears from the smoke detection part of the smoke detector and recovers. The line current flowing through the transmission line from the receiver increases according to the number of alarm indicator lamps lit, and the transmission line drawn from the receiver has a current limit. Control is performed to limit the number of alarm indicator lamps to be lit by the smoke addition test to a predetermined number, for example, 5 lamps.

For this reason, the examiner can continuously conduct the smoking test of the smoke detector until the number of alarm indicator lamps lit reaches 5, but even if the smoking test is performed with 5 lights lit, Since the alarm indicator lamp did not light up, it was decided to wait until smoke escaped from the tested smoke detector with the alarm indicator lamp lit and the alarm lamp turned off before conducting the next smoking test. Due to this waiting time, there is a problem that it takes a long time to complete the smoke test of all the smoke detectors.

In addition, even when a smoke detector triggers an alarm due to a fire, if the number of alarm indicator lights is limited in accordance with the current limit of the transmission line, the number of smoke detector alarms will be There is a problem that the alarm indicator lamp of the newly alarmed smoke sensor is not lit when the lighting limit number is exceeded.

The present invention provides a new smoke detector without waiting for recovery after smoke escapes from the smoke detector triggered by a fire so as to maintain the number of alarm indicator lamps lit corresponding to the current limit of the transmission line. It is possible to turn on the alarm indicator lamp by issuing a notification, and it is possible to perform a smoke addition test of the next smoke sensor without waiting for the smoke to escape from the smoke sensor that issued the alarm in the smoke addition test and to recover. An object of the present invention is to provide a fire alarm system that shortens working hours.

(Fire alarm equipment)
The present invention is a fire alarm system that monitors a fire by connecting a plurality of sensors to a receiver,
The receiver is equipped with a control unit that partially operates differently during monitoring and maintenance,
The control unit
determining a fire based on the signal received from the detector;
If the number of currently lit alarm indicator lamps is less than the predetermined maximum number of lit alarm lamps, a lighting instruction signal is sent to the detector that sent the signal that determined the fire to light the alarm lamps;
If the number of alarm indicator lights that are currently lit reaches the maximum number of lights,
At the time of monitoring, an extinguishing instruction signal is sent to the detector with the oldest lit alarm indicator lamp, excluding the specified detector, to extinguish it, and an extinguishing instruction signal is sent to the detector that sent the fire judgment signal. to turn on the alarm indicator lamp,
At the time of maintenance inspection, a signal to turn off the light is sent to the sensor with the oldest warning indicator light among all the sensors to turn it off, and a signal to turn on the light is sent to the sensor that sent the signal that judged the fire. to turn on the alarm indicator lamp,
When a recovery signal is received from a sensor that has transmitted a fire determination signal, a turn-off instruction signal is transmitted to the sensor to turn off the alarm indicator lamp.

Here, the predetermined sensor is at least the sensor for the first report.

(Maximum number of lights set dynamically based on line current)
The control unit measures the line current flowing in the transmission line connecting the receiver and multiple detectors, obtains the difference current from the predetermined rated allowable current, and calculates the difference current as the lighting current per alarm indicator lamp. The number of alarm indicator lamps that can be turned on is obtained by division, and the number of alarm lamps that can be turned on is added to the number of alarm indicator lamps that are currently on to obtain and set the maximum number of lamps that can be lit.

(Extinguishing of the alarm indicator lamp after the predetermined time has elapsed)
During maintenance and inspection, if a predetermined time elapses without receiving a recovery signal after sending a turn-on instruction signal to the smoke detector that issued the alarm, the control unit sends a turn-off instruction signal to the smoke detector and issues an alarm. Turn off the indicator light.

(The smoke detector with the alarm indicator lamp turned off is displayed on the receiver.)
the receiver
A function to display information identifying the smoke detector in alarm,
A function of displaying information identifying smoke detectors that have not received a restoration signal and whose alarm indicator lights are off among the smoke detectors that have received the fire signal;
have

(Simultaneous lights out order)
At the time of maintenance and inspection, the control unit transmits a simultaneous extinguishing instruction signal for extinguishing the alarm indicator lamps to all the smoke sensors to extinguish the alarm indicator lamps.

(Judged as true fire without recovery)
At the time of maintenance and inspection, among the sensors that have received the fire signal but have not received the recovery signal and whose alarm indicator lights are extinguished, after receiving the fire signal, the control unit If the detector does not receive the recovery signal even after the time has passed, it is assumed that a fire is really occurring, and the alarm indicator lamp is turned on.

(When the alarm indicator lamp is not functioning)
At the time of monitoring, if the control unit does not receive a recovery signal from the sensor that transmitted the signal that determined the fire and the sensor does not respond, the control unit transmits a turn-off instruction signal to the sensor and If the number of alarm lamps is subtracted and then a fire is determined based on the signal received from another detector, a lighting instruction signal is sent to the detector that sent the signal to turn on the alarm lamp. light up.

(Basic effects of fire alarm equipment)
The present invention is a fire alarm system for monitoring fires by connecting a plurality of smoke detectors to a receiver, wherein the receiver includes a control unit that partially operates differently during monitoring and during maintenance inspection, and controls The part receives and displays fire signals triggered by smoke detectors, and if the number of alarm indicator lamps that are currently lit is less than the specified maximum number of lights, instructs the alarmed smoke detectors to light up. When a signal is sent to turn on the alarm indicator lamps, and the number of currently lit alarm lamps reaches the maximum number of lamps to be lit, all alarm lamps other than the specified smoke detectors will be lit during monitoring. sends a turn-off instruction signal to the oldest smoke detector to turn it off, and sends a turn-on instruction signal to the alarmed smoke detector to turn on the alarm indicator light. Send a turn-off instruction signal to the smoke detector with the oldest alarm indicator lamp to turn it off, and send a turn-on instruction signal to the smoke detector that triggered the alarm to turn on the alarm indicator lamp and issue an alarm. When a recovery signal is received from a smoke detector that has been activated, an extinguishing instruction signal is sent to the smoke detector to extinguish the alarm indicator lamp. When the number reaches the maximum number of lights, for example 5 lights, the alarm display of the 3rd report, which is the oldest among the specified smoke detectors, that is, the smoke detectors of the 1st and 2nd reports, is lit up. After the light is extinguished, it is possible to turn on the alarm indicator lamps of the smoke detectors that generate the next alarm. While limiting to 5 lights, it is possible to turn on the alarm indicator lamp of the newly alarmed smoke sensor.

(Effect of the display form of the alarm indicator light)
At the time of maintenance and inspection, the control unit distinguishes between the fire source sensor and the most recently triggered sensor in order to change the display mode of the alarm indicator lamp between the specified smoke detector and other smoke detectors. can be distinguished.

(Effect of the maximum number of lights set as a fixed value)
In addition, since the control unit is designed to set the maximum number of alarm indicator lamps to be lit as a predetermined fixed value, the next smoke detector can be detected without waiting for the smoke to escape from the alarmed smoke detector by the smoke addition test. Even if the smoking test is performed, the lighting of the alarm indicator lamps can be maintained with the maximum number of lighting lamps satisfying the current limit of the transmission line from the receiver being, for example, 5 lamps.

(Effect of maximum number of lights set dynamically from line current)
In addition, the control unit measures the line current flowing in the transmission line connecting the receiver and the plurality of smoke detectors, obtains the difference current from the predetermined rated allowable current, and calculates the difference current for each alarm indicator lamp. The maximum number of alarm lamps that can be lit is obtained by dividing by the lighting current, and the maximum number of alarm lamps that can be lit is added to the number of alarm lamps that are currently on. During the smoking test, the actual circuit current flowing is measured, and the maximum number of alarm indicator lamps that are within the rated allowable current is dynamically set to ensure that the current limit that does not exceed the rated allowable current is met. It is possible to control the number of lights of the information indicator lamp.

(Effect of extinguishing the alarm indicator light after the elapse of a predetermined time)
Also, during maintenance and inspection, if a predetermined period of time elapses without receiving a recovery signal after sending a turn-on instruction signal to the alarmed smoke sensor, the control unit sends a turn-off instruction signal to the smoke sensor. Since the alarm indicator lamp is turned off, even if it takes a long time for the smoke from the smoke detector to recover from the smoke test, the alarm indicator lamp will be extinguished after the predetermined time, and the test will be unnecessary. To prevent the continuation of a state in which an alarm indicator lamp of an already smoke sensor continues to light and a line current increases.

(Effect of displaying the smoke detector on the receiver while the alarm indicator lamp is turned off)
In addition, the receiver has a function to display information identifying the smoke detectors that are issuing alarms, and the alarm indicator lights of the smoke detectors that have received the fire signal but have not received the restoration signal. and a function to display information specifying the smoke detectors that are in operation, and the smoke detectors that have issued a test alarm in the receiver but are waiting for recovery after the alarm indicator lamp is turned off. can know

(Effect of collective lights-out order)
In addition, during maintenance and inspection, the control unit transmits a simultaneous extinguishing instruction signal to extinguish the alarm indicator lamps to all the smoke detectors to extinguish the alarm indicator lamps. When the smoke test is finished, a simultaneous extinguishing instruction signal is transmitted to the smoke detectors whose alarm indicator lamps are lit and are waiting for recovery, so that they can be extinguished and returned to the steady monitoring state.

(Effect of judging true fire without recovery)
Also, during maintenance and inspection, the control unit receives the fire signal from among the smoke detectors that have received the fire signal but have not received the recovery signal and whose alarm indicator lights are turned off. Smoke detectors that do not receive a restoration signal even after a certain amount of time has passed since the smoke detector is considered to be a real fire and turn on the alarm indicator light, so that the current limit of the transmission line is supported. Even if the alarm indicator lamps are turned off to limit the number of alarm indicator lamps lit, if the fire alarm continues, it is assumed that a fire is truly occurring and the alarm is turned off. To reliably display a fire alarm by lighting an indicator lamp.

Explanatory diagram showing the outline of the fire alarm system Block diagram illustrating an embodiment of a smoke detector Flowchart showing smoking test control by test control section of receiver Flowchart showing the calculation of the number of alarm indicator lamps lit by the test control unit of the receiver

[Fire alarm system]
(Overview of fire alarm system)
FIG. 1 is an explanatory diagram showing an outline of a fire alarm system, taking as an example a system in which a smoke sensor is connected to a loop transmission line led out from a receiver.

As shown in FIG. 1, an R-type receiver 10, for example, is installed in a janitor's office on the first floor of a building where a fire alarm system is installed. A loop transmission line 12 using 14b is drawn out.

A plurality of smoke sensors 18 each having a unique address and a transmission function are detachably connected to the loop transmission line 12 via a sensor base 16 . The maximum number of addresses set for the smoke sensors 18 connected to the loop transmission line 12 is, for example, 255, and a maximum of 254 smoke sensors 18 can be connected to the loop transmission line 12 .

The smoke sensor 18 is provided with an alarm indicator lamp 48, which is turned on by an instruction from the receiver 10 when a fire alarm is issued, and is turned off by an instruction from the receiver 10 when the fire is restored.

(Functional configuration of receiver)
The receiver 10 includes a reception control section 20, a transmission section 22, an operation section 23, a display section 24, an alarm section 25, an alarm transfer section 26, a disconnection monitoring control section 28, and switching circuit sections 30a and 30b.

The reception control unit 20 is assumed to be a computer circuit or the like having a CPU, memory, various input/output ports, and the like. The transmitter 22 transmits and receives signals to and from the smoke sensor 18 connected to the loop transmission line 12 according to a predetermined communication protocol.

A downstream signal from the transmission unit 22 to the smoke sensor 18 is transmitted in voltage mode. This voltage-mode signal is transmitted as voltage pulses that vary the line voltage of the loop transmission line 12, for example, between 18 and 30 volts.

In contrast, the upstream signal from the smoke detector 18 to the receiver 10 is transmitted in current mode. In this current mode, a signal current is passed through the loop transmission line 12 at the timing of bit 1 of the transmission data, and an upstream signal is transmitted to the receiver as a so-called current pulse train.

(Fire monitoring control unit)
The reception control unit 20 of the receiver 10 is provided with the function of the fire monitoring control unit 32 as a function realized by executing the program by the CPU.

During normal monitoring, the fire monitoring control unit 32 instructs the transmission unit 22 to transmit a broadcast batch AD conversion signal including a batch AD conversion command at regular intervals. Upon receiving the converted signal, the smoke sensor 18 detects and holds the smoke density as sensor data. Subsequently, the fire monitoring control unit 32 transmits a call signal including polling commands sequentially designating terminal addresses.

When the smoke sensor 18 receives a call signal having an address that matches its own address, it transmits a response signal containing the sensor data held at that time to the receiver 10 . Smoke detector 18 also sends a fire interrupt signal to receiver 10 when it detects a fire.

When the fire monitoring control unit 32 receives the fire interrupt signal via the transmission unit 22, the fire monitoring control unit 32 transmits a group search command signal to identify the group including the smoke detectors 18 that are detecting fire, and then issues an intra-group search command. Identify the address of the smoke sensor 18 that is detecting fire by transmitting a signal, output a fire alarm and display the fire occurrence address, and then collect and monitor fire data from the identified smoke sensor. control.

Further, when the fire monitoring control unit 32 determines that the fire alarm has been triggered by the smoke sensor 18, the fire monitoring control unit 32 transmits a lighting instruction signal including a lighting instruction command for the alarm indicator lamp 48 designating the fire alarm address. It controls lighting of the warning display lamp 48 of the sensor 18 .

Further, when the fire monitoring control unit 32 determines that the fire is to be restored after the fire alarm is issued by the smoke sensor 18, the fire monitoring control unit 32 transmits an extinguishing instruction signal including an extinguishing instruction command for the alarm indicator lamp 48 designating the fire restoration address. Control is performed to extinguish the alarm indicator lamp 48 of the smoke sensor 18 that has notified.

(Disconnection monitoring control unit)
The disconnection monitoring control unit 28 of the receiver 10 detects and monitors the signal voltage obtained at the end of the loop transmission line 12, and when a disconnection occurs in the loop transmission line 12, the signal voltage is cut off and detection becomes impossible. , and by turning on the switching circuit units 30a and 30b using relay contacts and switch elements, the transmission unit 22 is connected to the end of the loop transmission line 12, and the disconnection position is detected from both ends of the loop transmission line 12. Disconnection faults are recovered by sending and receiving signals in parallel to and from the transmission line.

(test control unit)
The reception control section 20 of the receiver 10 is provided with the function of the test control section 34 as a function realized by executing the program by the CPU. When the inspector 38 uses the test jig 36 to perform a smoke addition test on the smoke sensor 18 during a periodic inspection, the test control unit 34 sets the maintenance inspection mode by performing a predetermined operation on the receiver 10. Operate. When the maintenance and inspection mode is set in the receiver 10, main sound stop, area sound stop, interlocking stop by the transfer signal, and the like are performed.

When the test control unit 34, which operates in the setting of the maintenance inspection mode, receives the fire signal triggered by the smoke addition test of the smoke sensor 18, the address of the alarmed smoke sensor 18 is displayed on the display of the display unit 24 or 8 segments. It is displayed on the display, and the alarm is received and displayed.

Even when the maintenance and inspection mode is set, the fire monitoring control unit 32 instructs the transmission unit 22 to transmit a broadcast batch AD conversion signal including a batch AD conversion command at regular intervals. The smoke sensor 18 that has received the AD converted signal detects and holds the smoke concentration as sensor data. Subsequently, the fire monitoring control unit 32 transmits a call signal including polling commands sequentially designating terminal addresses. When the smoke sensor 18 receives a call signal having an address that matches its own address, it transmits a response signal containing the sensor data held at that time to the receiver 10 .

The smoke detector 18 notifies the receiver 10 when smoke flows into the smoke detecting section and the smoke concentration detection signal exceeds a threshold concentration that is a predetermined fire level, and a fire interrupt signal is sent to the receiver 10 by the alarm. Send.

When the fire monitoring control unit 32 receives a fire interrupt signal triggered by the alarm via the transmission unit 22, it transmits a group search command signal to identify the group including the smoke detectors 18 that are detecting the fire. Specify the address of the smoke sensor 18 issuing the alarm by transmitting an internal search command signal, display the address of the smoke sensor 18 issuing the alarm, and perform control to notify the test control unit 34 of the alarm address. .

When the test control unit 34 receives notification of the alarm address from the fire monitoring control unit 32, the test control unit 34 transmits a lighting instruction signal including a lighting instruction command for the alarm indicator lamp 48 designating this alarm address, and detects the emitted smoke. It controls lighting of the warning display lamp 48 of the sensor 18 .

In the lighting control of the alarm indicator lamps 48 of the smoke sensor 18 that issued the alarm, the test control unit 34 of the present embodiment sets the number N of the alarm indicator lamps 48 currently lit to a predetermined maximum number of lights Nmax, For example, compared with Nmax=5 lights, if the number of lights is less than the maximum lighting number Max, a lighting instruction signal specifying the alarm address is transmitted, and control is performed to light the alarm indicator lamp 48 of the smoke sensor 18 that issued the alarm. .

On the other hand, when the number N of alarm indicator lamps 48 currently lit reaches a predetermined maximum number Nmax of alarm lamps 48 lit, the test control unit 34 determines that the smoke sensor whose alarm indicator lamp 48 is the oldest. After transmitting the extinguishing instruction signal designating the address to turn off the light, the extinguishing instruction signal designating the alarm address obtained by receiving the alarm at the present time is transmitted, and the alarm of the smoke sensor 18 that issued the alarm is issued. It controls lighting of the indicator lamp 48 . Here, the maximum lighting number Nmax of the alarm indicator lamp 48 is determined corresponding to the rated allowable current of the loop transmission line 12 .

In addition, the fire monitoring control unit 32 transmits collective AD conversion signals to all the smoke sensors 18 connected to the loop transmission line 12 including the smoke sensors 18 that have been notified by the smoke test, and assigns addresses between them. Designated calling signals are sequentially transmitted, response signals including smoke density detection data are received from the smoke detectors 18 in response to the calling signals, and smoke passes through the smoke detectors of the smoke detectors 18 that issued the alarm, and the smoke density is determined. When the detection signal falls below the threshold concentration, a response signal to the calling signal is transmitted including the fire restoration information. For this reason, the fire monitoring control section 32 determines the fire recovery information by receiving the response signal of the smoke sensor 18 that issued the alarm, and notifies the test control section 34 of the test recovery.

When the test control unit 34 receives the notification of test recovery from the fire monitoring control unit 32, the test control unit 34 transmits a turn-off instruction signal including a turn-on/off command for the alarm indicator lamp 48 specifying the address of the smoke sensor 18 corresponding to the test recovery. Control is performed to extinguish the alarm indicator lamp 48 of the smoke sensor 18 that has transmitted and issued an alarm.

By controlling the alarm indicator lamps 48 by the test control unit 34 in this way, when the number of the alarm indicator lamps 48 being lit in the smoke detector 18 reaches the maximum lighting number Nmax, for example 5 lights, by the smoke addition test, The alarm indicator lamp 48 lit the oldest is extinguished, and the next smoke sensor is turned on without waiting until the alarm indicator lamp 48 is extinguished by recovering the smoke from the smoke sensor 18 which has undergone the smoke addition test. The smoke test can be performed, the work efficiency is improved by eliminating the waiting time, and the time to complete the smoke test of all the smoke detectors can be shortened.

In addition, even if the number of smoke detectors 18 in the alarming state without removing smoke in the smoke addition test exceeds, for example, 5 corresponding to the maximum lighting number Nmax, the number of alarm indicator lamps 48 that are actually lit The alarm indicator lamps 48 can be controlled so that the number does not exceed 5 lamps and the current is limited so that the rated allowable current of the loop transmission line 12 is not exceeded.

Here, the control by the test control unit 34 to set the number of lighting of the alarm indicator lamp 48 to the maximum lighting number Nmax or less is performed by using a first-in, first-out arrangement of the alarm address of the smoke sensor 18 on the memory, a so-called FIFO arrangement. .

For example, if five smoke detectors 18 are sequentially smoked in the order of addresses A1 to A5, the FIFO array will have (A5 A4 A3 A2 A1)
is stored.
Assuming that the sixth smoke sensor 18 issues an alarm in this state and the alarm address A6 is obtained, the number of alarm indicator lamps 48 currently lit has reached the maximum number of 5 lights. The test control unit 34 transmits a light-off instruction signal designating the address A1 of the smoke sensor whose alarm indicator light 48 in the FIFO array has been turned on the oldest, and after extinguishing it, designates the address A6 that is currently notified. Then, the alarm indicator lamp 48 of the smoke sensor 18 that is newly alarmed is turned on, and the FIFO arrangement is changed to (A6 A5 A4 A3 A2).
rewrite to

[Functional configuration of smoke detector]
FIG. 2 is a block diagram illustrating an embodiment of a smoke detector. As shown in FIG. 2, the smoke detector 18 is composed of a power supply section 40, a transmission section 42, a sensor control section 44, a smoke detection section 46 and an alarm indicator lamp 48, and is detected by fitting terminal fittings 50a and 50b. It is electrically and mechanically detachable from the vessel base 16 .

A power supply unit 40 of the smoke sensor 18 receives the power supply voltage supplied from the receiver side through the loop transmission line 12 consisting of the signal lines 14a and 14b, and outputs a predetermined constant voltage as the sensor power supply voltage. In addition to the signal lines 14a and 14b for transmission, the loop transmission line 12 may be provided with a dedicated power supply line.

The transmission unit 42 receives the upstream signal in voltage mode and transmits the downstream signal in current mode from the transmission unit 22 of the receiver 10 .

The smoke detection unit 46 has a known scattered light type smoke detection structure, and intermittently drives a light emitting unit using an infrared LED to emit light at a predetermined cycle, and detects a light reception signal of scattered light received by a light receiving unit such as a photodiode. is amplified to output a smoke density detection signal.

The sensor control section 44 is composed of a computer circuit having various input/output ports including a CPU, a memory, and an A/D conversion port, and the functions of the sensor control section 44 are realized by executing a program.

When the sensor control unit 44 receives the batch A/D converted signal via the transmission unit 42, the smoke concentration detection signal output from the smoke detection unit 46 is sampled by A/D conversion to obtain smoke concentration detection data. Then, when a call signal matching the own address is received, it generates a response signal in which the smoke density detection data is set, and instructs the transmission section 42 to transmit it.

Further, the sensor control unit 44 compares the smoke density detection data with a predetermined smoke density threshold value for fire determination, determines that there is a fire when the smoke density threshold is equal to or exceeds the smoke density threshold, and instructs the transmission unit 42 to Controls the transmission of interrupt signals.

Further, the sensor control unit 44 controls transmission of a fire response signal in response to a group search signal or an intra-group search signal received following the transmission of the fire interrupt signal.

Further, after transmitting the fire interrupt signal, the sensor control unit 44 determines that the fire has been restored when the smoke density detection data falls below the smoke density threshold value, and receives the call signal matching its own address. is set to generate a response signal and instruct the transmission unit 42 to transmit it.

Further, when the sensor control unit 44 receives a lighting instruction signal designating its own address, it lights up the alarm indicator lamp 48, and thereafter, when it receives a turn-off instruction signal designating its own address, it extinguishes the alarm indicator lamp 48. to control.

The control of the sensor control unit 44 when the smoke sensor 18 is alarmed by the smoke test is similar to the fire alarm, such as transmission of the fire interrupt signal, group search signal, and response signal to the group search signal. Transmission, transmission of a response signal including fire restoration information, lighting of the alarm indicator lamp 48 upon receipt of the illumination instruction signal, and extinguishing of the alarm indicator lamp 48 upon receipt of the extinguishing instruction signal are performed.

[Smoking test control]
FIG. 3 is a flowchart showing smoking test control by the receiver, which is a control operation by the test control section 34 provided in the receiver 10 of FIG.

As shown in FIG. 3, the test control unit 34 activated by the setting operation of the maintenance and inspection mode in the receiver 10 proceeds to step S2 when determining reception of the alarm from the smoke sensor 18 in step S1, and proceeds to step S2. The address of the sensor 18 is displayed on the display unit 24 and notified to the examiner attached to the receiver 10 .

Subsequently, the test control unit 34 proceeds to step S3, compares the lighting number N of the alarm indicator lamps 48 currently being lit with the maximum lighting number Nmax, and proceeds to step S4 if the lighting number is less than the maximum lighting number Nmax. , a lighting instruction signal designating the alarm address displayed in step S2 is transmitted, and the alarm indicator lamp 48 of the smoke sensor 18 that issued the alarm is turned on. is incremented by one.

On the other hand, in step S3, the test control unit 34 compares the lighting number N of the alarm indicator lamp 48 with the maximum lighting number Nmax. An extinguishing instruction signal designating the address of the smoke sensor 18 of the oldest alarm indicator lamp 48 among the lamps 48 is transmitted to extinguish the alarm indicator lamp 48, and the process proceeds to step S7 to decrease the lighting number N of the alarm indicator lamp 48 by one. and return to step S3.

Therefore, in step S3, it is determined that the lighting number N of the alarm indicator lamp 48 has become less than the lighting maximum number Nmax, and the process proceeds to step S4 to transmit a lighting instruction signal designating the alarm address displayed in step S2. Then, the alarm indicator lamp 48 of the smoke sensor 18 that issued the alarm is turned on, and the process advances to step S5 to increase the lighting number N of the alarm indicator lamp 48 by one.

Subsequently, when the test control unit 34 determines that the smoke sensor 18 reported in step S8 has been restored, the process proceeds to step S9, where it transmits a turn-off instruction signal designating the address of the smoke sensor 18 that has been restored. The alarm indicator lamp 48 of the device 18 is turned off, the process proceeds to step S10, the lighting number N of the alarm indicator lamp 48 is decreased by one, and step S11 is performed until it is determined that the maintenance and inspection mode in the receiver is off. The processing from S1 is repeated.

[Dynamic setting control of maximum number of lights]
As another embodiment of the test control unit 34 provided in the receiver 10 of FIG. 1, the test control unit 34 measures the line current Is flowing through the loop transmission line 12 and is obtained as the available current Ia, and the available current Ia is divided by the lighting current ΔI per alarm indicator lamp to obtain the number ΔN of the alarm indicator lamps 48 that can be lit. It is added to the number N of alarm indicator lamps 48 to determine and set the maximum lighting number Nmax.

FIG. 4 is a flow chart showing how the test control section of the receiver calculates the number of alarm indicator lamps lit. As shown in FIG. 4, the test control unit 34 measures the line current Is flowing through the loop transmission line 12 in the maintenance and inspection mode setting state in step S21. Then, the available current Ia is
Ia=Ith-Is
Then, in step S23, if the lighting current per alarm indicator lamp is ΔI, the number of alarm indicator lamps 48 that can be lit is ΔN=Ia/ΔI
Ask as

Subsequently, the test control unit 34 proceeds to step S24, where N is the current number of lights of the alarm indicator lamp 48, the maximum number of lights Nmax is set to Nmax=N+ΔN.
, and the maximum lighting number Nmax used in step S3 of FIG. 2 is changed.

By dynamically setting the maximum lighting number Nmax that limits the lighting number of the alarm indicator lamp 48 based on the measurement of the line current in this way, The maximum lighting number of alarm indicator lamps 48 is dynamically set to limit the current within the rated allowable current, and the number of alarm indicator lamps 48 lit is controlled to satisfy the current limit that does not exceed the rated allowable current. can do.

[Extinguishing control of the alarm indicator light over time]
The test control unit 34 provided in the receiver 10 of FIG. 1, in addition to controlling the warning indicator lamp shown in FIG. In this case, if a predetermined time Ts has elapsed since the transmission of the lighting instruction signal without receiving the recovery signal, control is performed to transmit the extinguishing instruction signal to the smoke sensor 18 to extinguish the alarm indicator lamp 48 .

By turning on the notification indicator lamp 48 of the smoke sensor 18 that has issued a notification in this way for a predetermined period of time under the control of the receiver 10, it takes time for the smoke from the smoke addition test to escape from the smoke sensor 18 and recover. Even if it takes, the alarm indicator lamp 48 is turned off after a predetermined time, and the alarm indicator lamp 48 of the tested smoke sensor 18 continues to be lit unnecessarily, and the line current continues to increase. to prevent

[Modification of the present invention]
(transmission line)
The above embodiment takes as an example a fire alarm system in which a smoke detector is connected to a loop transmission line drawn from a receiver, but a transmission line drawn unidirectionally to a restricted area without returning to the receiver. The same applies to fire alarm equipment with smoke detectors connected.

(Restrictions on number of flashes other than during testing)
Although the above-described embodiment describes extinguishing control of the alarm indicator lamp of the sensor when the receiver is in the maintenance and inspection mode, it may be applied to the actual operation instead of the maintenance and inspection mode.

During actual operation, the alarm indicator lamp of the detector is kept lit to identify the fire source for the first and second reports, and the alarm indicator lamp of the detector after the third report is kept lit. The light may be turned off from . In other words, when the sensors at addresses A1, A2, A3, A4 and A5 issue alarms in that order, and when the sensor at address A6 issues an alarm, A1, A2, A4, A5 and A6 are in the alarm display state.

By doing so, it is possible to check the sensor that triggered the latest alarm at the site while displaying the alarm of the detector at the origin of the fire. Also, at this time, the alarm display form of the sensor for the first and second reports is, for example, a lighting state, and the display form for the third and subsequent reports is, for example, a blinking state. It may also be possible to distinguish between the sensor at the origin of the fire and the sensor that issued the most recent alarm.

In addition, as another form of operation, if a detector that has received a fire signal but has not received a restoration signal does not respond to the signal from the receiver, the detector will burn out and cause a fire. Assuming that the alarm indicator lamp is not functioning, after sending a signal to turn off the alarm indicator lamp to the relevant sensor, subtract the current number of alarm indicator lamps recognized by the needle holder and start another detection. When the device issues an alert, the alert may be displayed.

(About detector)
Although the above embodiments describe alarm indicator lights for smoke detectors, they are equally applicable to other detectors such as heat detectors, flame detectors, and other detectors that detect fire. Smoke detectors are highly effective because smoke remains in the detector after the smoke test and the alarm is maintained.

(The smoke detector with the alarm indicator lamp turned off is displayed on the receiver.)
In the above embodiment, the receiver has the function of displaying information identifying the smoke detectors that are issuing alarms. and the information specifying the smoke sensor whose alarm indicator lamp is turned off may be displayed. As a result, in the receiver, it is possible to know the smoke detectors which have issued a test alarm but whose alarm indicator lights have been extinguished and are waiting for recovery.

(Simultaneous lights out order)
The test control unit of the above embodiment, if necessary, transmits a simultaneous extinguishing instruction signal for extinguishing the alarm indicator lamps to all the smoke detectors, and the alarm indicator lamps that have received the simultaneous extinguishing instruction signal A smoke detector that is lit may turn off the alarm indicator light.

As a result, for example, when the smoke test of all smoke detectors is completed, the alarm indicator lamp lights up and a simultaneous extinguishing instruction signal is sent to the smoke detectors waiting for restoration to turn them off, and steady monitoring is performed. state can be restored.

(Judged as true fire without recovery)
The test control unit of the above-described embodiment receives the fire signal from among the smoke sensors that have received the fire signal but have not received the recovery signal and whose alarm indicator lights are turned off. A smoke detector that does not receive a recovery signal even after a predetermined time has passed may be considered to have a real fire, and an alarm indicator lamp may be turned on.

As a result, even if the alarm indicator lamps are turned off in order to limit the number of alarm indicator lamps that light up in response to the current limit of the transmission line, if the fire alarm continues, a true fire will not occur. It is possible to reliably display the fire alarm by turning on the alarm indicator lamp that has been turned off assuming that there is a fire.

(repeater)
In the above embodiment, the transmission line is drawn out from the receiver, but it can be similarly applied to the transmission line drawn out from the repeater connected to the receiver. In this case, the repeater has the configuration of the receiver 10 shown in FIG. When a fire is detected, fire detection information is transmitted to the receiver 10 to output a fire alarm.

(P-type receiver)
The above embodiment takes as an example a fire alarm system in which an R-type smoke sensor is connected via a transmission line from an R-type receiver. The same applies to fire alarm systems connected to addressable smoke detectors that are set and have a transmission function.

(others)
Moreover, the present invention includes appropriate modifications that do not impair its purpose and advantages, and is not limited by the numerical values shown in the above embodiments.

10: receiver 12: loop transmission lines 14a, 14b: signal line 16: sensor base 18: smoke sensor 20: reception control units 22, 42: transmission unit 28: disconnection monitoring control units 30a, 30b: switching circuit unit 32 : Fire monitoring control unit 34: Test control unit 36: Test jig 40: Power supply unit 44: Sensor control unit 46: Smoke detection unit 48: Alarm indicator lamps 50a, 50b: Fitting terminal fittings

Claims (4)

A fire alarm system that monitors fire by connecting multiple sensors to a receiver,
The receiver includes a control unit that partially operates differently during monitoring and during maintenance,
The control unit
determining a fire based on the signal received from the sensor;
if the number of alarm indicator lights currently lit is less than a predetermined maximum number of lights, then a lighting instruction signal is sent to the sensor that sent the signal that determined the fire to light the alarm indicator lights;
If the number of alarm indicator lights that are currently lit reaches the maximum number of lights,
At the time of monitoring, an extinguishing instruction signal is sent to the detector with the oldest lit alarm indicator lamp other than the predetermined one to extinguish it, and the extinguishing instruction signal is sent to the detector that has sent the fire determination signal. Transmit and turn on the alarm indicator light,
At the time of maintenance and inspection, the extinguishing instruction signal is sent to the sensor whose alarm indicator light is the oldest among all the sensors to extinguish it, and the extinguishing instruction signal is sent to the sensor that has sent the fire determination signal. Send a signal to turn on the alarm indicator light,
When a recovery signal is received from the sensor that transmitted the signal that determined the fire, the extinguishing instruction signal is transmitted to the sensor to extinguish the alarm indicator light,
A fire alarm system, wherein the predetermined sensor is at least a first alarm sensor.
A fire alarm system that monitors fire by connecting multiple sensors to a receiver,
The receiver includes a control unit that partially operates differently during monitoring and during maintenance,
The control unit
determining a fire based on the signal received from the sensor;
if the number of alarm indicator lights currently lit is less than a predetermined maximum number of lights, then a lighting instruction signal is sent to the sensor that sent the signal that determined the fire to light the alarm indicator lights;
If the number of alarm indicator lights that are currently lit reaches the maximum number of lights,
At the time of monitoring, an extinguishing instruction signal is sent to the detector with the oldest lit alarm indicator lamp other than the predetermined one to extinguish it, and the extinguishing instruction signal is sent to the detector that has sent the fire determination signal. Transmit and turn on the alarm indicator light,
At the time of maintenance and inspection, the extinguishing instruction signal is sent to the sensor whose alarm indicator light is the oldest among all the sensors to extinguish it, and the extinguishing instruction signal is sent to the sensor that has sent the fire determination signal. Send a signal to turn on the alarm indicator light,
When a recovery signal is received from the sensor that transmitted the signal that determined the fire, the extinguishing instruction signal is transmitted to the sensor to extinguish the alarm indicator light,
Measure the line current flowing in the transmission path connecting the receiver and the plurality of sensors to obtain the differential current from a predetermined rated allowable current, and calculate the differential current as the lighting current per unit of the alarm indicator lamp. A fire alarm system characterized in that the number of alarm indicator lamps that can be turned on is obtained by division, and the number of alarm lamps that can be turned on is added to the number of alarm indicator lamps that are currently on to obtain and set the maximum number of lamps that can be lit. .
A fire alarm system that monitors fire by connecting multiple sensors to a receiver,
The receiver includes a control unit that partially operates differently during monitoring and during maintenance,
The control unit
determining a fire based on the signal received from the sensor;
if the number of alarm indicator lights currently lit is less than a predetermined maximum number of lights, then a lighting instruction signal is sent to the sensor that sent the signal that determined the fire to light the alarm indicator lights;
If the number of alarm indicator lights that are currently lit reaches the maximum number of lights,
At the time of monitoring, an extinguishing instruction signal is sent to the detector with the oldest lit alarm indicator lamp other than the predetermined one to extinguish it, and the extinguishing instruction signal is sent to the detector that has sent the fire determination signal. Transmit and turn on the alarm indicator light,
At the time of maintenance and inspection, the extinguishing instruction signal is sent to the sensor whose alarm indicator light is the oldest among all the sensors to extinguish it, and the extinguishing instruction signal is sent to the sensor that has sent the fire determination signal. Send a signal to turn on the alarm indicator light,
When a recovery signal is received from the sensor that transmitted the signal that determined the fire, the extinguishing instruction signal is transmitted to the sensor to extinguish the alarm indicator light,
At the time of maintenance inspection, of the detectors that received the fire signal but did not receive the recovery signal and the alarm indicator lamp is extinguished, the specified time has passed since the fire signal was received. A fire alarm system characterized by lighting an alarm indicator lamp assuming that a fire is truly occurring in a sensor that does not receive a recovery signal even if the alarm is set.
A fire alarm system that monitors fire by connecting multiple sensors to a receiver,
The receiver includes a control unit that partially operates differently during monitoring and during maintenance,
The control unit
determining a fire based on the signal received from the sensor;
if the number of alarm indicator lights currently lit is less than a predetermined maximum number of lights, then a lighting instruction signal is sent to the sensor that sent the signal that determined the fire to light the alarm indicator lights;
If the number of alarm indicator lights that are currently lit reaches the maximum number of lights,
At the time of monitoring, an extinguishing instruction signal is sent to the detector with the oldest lit alarm indicator lamp other than the predetermined one to extinguish it, and the extinguishing instruction signal is sent to the detector that has sent the fire determination signal. Transmit and turn on the alarm indicator light,
At the time of maintenance and inspection, the extinguishing instruction signal is sent to the sensor whose alarm indicator light is the oldest among all the sensors to extinguish it, and the extinguishing instruction signal is sent to the sensor that has sent the fire determination signal. Send a signal to turn on the alarm indicator light,
When a recovery signal is received from the sensor that transmitted the signal that determined the fire, the extinguishing instruction signal is transmitted to the sensor to extinguish the alarm indicator light,
During monitoring, if the recovery signal is not received from the sensor that transmitted the signal that determined the fire and the sensor does not respond, the extinguishing instruction signal is transmitted to the sensor, and the current lighting is turned on. If the number of alarm lamps is subtracted and then a fire is determined based on the signal received from another sensor, the lighting instruction signal is sent to the detector that sent the signal to turn on the alarm lamp. A fire alarm system characterized by lighting.

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