JP2021086367A - Fire alarm facilities - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable interlocking control to surely operate a disaster prevention device when a fire is confirmed, even if a low-sensitivity interlocking threshold value for interlocking control of a fire shutter or the like is set with respect to a fire alarm threshold value for determining and warning a fire. do. SOLUTION: An analog fire detector 14-1 for fire alarm, an analog fire detector 14-2 for interlocking, and an interlocking repeater 16-2 for a fire shutter 24 are connected to signal lines 12-1 to 12-3 of a receiver 10. To connect. The fire alarm control unit 46 determines that the fire is a fire based on the detection value of the analog fire alarm 14-1 for the fire alarm and outputs a fire alarm. The interlocking control unit 48 controls the fire shutter 24 based on the detection value of the interlocking analog fire detector 14-2. When the fire control unit 46 determines that the fire is confirmed, the sensitivity changing unit 50 changes the interlocking threshold value of the interlocking control unit 48 to a lower value to increase the sensitivity, and based on the detection value of the interlocking analog fire detector 14-2. The fire shutter 24 is surely operated. [Selection diagram] Fig. 1

Description

The present invention relates to a fire alarm system for monitoring a fire by connecting terminals such as a fire detector and a smoke prevention device in which a unique address is set for a signal line drawn from a receiver.

Conventionally, in the fire alarm system known as the R type, a fire alarm for fire alarm having a transmission function in which a unique address is set is connected to the signal line drawn from the receiver, and fire prevention is performed. A fire detector for interlocking control for interlocking control of smoke prevention equipment such as a shutter is connected, and in the normal monitoring state, the detected values such as smoke concentration and temperature are detected by calling the fire detector that sequentially specifies the detector address. It collects and monitors, and in the event of a fire, it issues a search command from the receiver based on the fire interruption signal from the fire alarm for fire alarm, identifies the address of the fire detector that issued the alarm, and determines the detected value. When it is collected and the detected value exceeds a predetermined fire alarm threshold, it is judged as a fire and a fire alarm is output.

Also, in the event of a fire, based on the fire interruption signal from the interlocking fire detector, similarly, the address of the interlocking fire detector that issued the alarm is specified, and the detected values such as smoke concentration and temperature are collected and detected. Is determined to be a fire when it exceeds a predetermined interlocking threshold, and interlocking control is performed in which a fire prevention section is formed by closed driving by transmitting a control signal specifying the address of a fire prevention shutter, for example, which is the interlocking destination.

Here, the fire alarm threshold value for determining a fire from the detection value of the fire alarm for fire alarm is set to a threshold value corresponding to, for example, two types of sensitivity, while the fire is determined from the detection value of the interlocking fire detector. The interlocking threshold value for operating the interlocking device such as the fire shutter is a low sensitivity threshold value corresponding to, for example, three types of sensitivity.

The reason is that after a fire is warned and evacuated by a fire judgment corresponding to the second type sensitivity, the fire shutter is closed by a fire judgment corresponding to the lower sensitivity of the third type to form a fire prevention section.

In addition, the fire alarm threshold value of the type 2 sensitivity set in the receiver can be changed within the range of the type 2 sensitivity. For example, the daytime time zone when a person is in the room has the type 2 sensitivity. Sensitivity is changed according to the time schedule, in which the threshold value is set to a high value to make the sensitivity low, and the threshold value of the two types of sensitivity is set to a low value to make the sensitivity high during the nighttime hours when the person is unmanned. ..

Japanese Unexamined Patent Publication No. 2007-265353 JP-A-2017-204807

However, in such a fire alarm system, when a fire breaks out, a fire alarm is output based on the judgment of the fire based on the threshold of two types of sensitivity with respect to the smoke concentration from the smoke detector for fire alarm. However, there is a risk that the fire prevention shutter will not operate because the fire judgment is not made based on the thresholds of the three types of sensitivity with respect to the smoke concentration from the interlocking smoke detector.

For example, when the facility where the fire broke out was a large space with a wide ceiling, the smoke concentration of the smoke flowing into the smoke detector installed on the ceiling surface was set to, for example, 10% / m. Although it exceeds the threshold, it does not exceed the fire alarm threshold of the three types of sensitivity set at 15% / m, the fire cannot be judged from the smoke concentration from the smoke detector for interlocking control, and the fire shutter is normal. There is a risk that it will not operate and the fire protection compartment has not been sufficiently formed.

In the present invention, a fire is confirmed even if a fire is determined by setting a low-sensitivity interlocking threshold for interlocking control of a disaster prevention device such as a fire shutter with respect to a fire alarm threshold that determines and warns of a fire. The purpose is to provide highly reliable fire alarm equipment that enables interlocking control to operate disaster prevention equipment reliably in the state.

(Fire alarm system)
The present invention relates to a fire alarm system in which a fire alarm for fire alarm, a fire detector for interlocking, and a predetermined interlocking device are connected to a signal line drawn from a receiver.
To the receiver
A fire alarm control unit that outputs a fire alarm based on the detection value of the fire alarm for fire alarm,
An interlocking control unit that interlocks and controls interlocking equipment based on the detection value of the interlocking fire detector,
When the fire alarm control unit determines that a fire is confirmed (true fire), the interlocking control unit changes the sensitivity in a direction that makes it easier to determine that it is a fire.
Is provided.

(Change of interlocking threshold to increase sensitivity)
When the fire alarm control unit determines that the fire is confirmed, the sensitivity changing unit changes the interlocking threshold value of the interlocking control unit to a lower interlocking threshold value than the interlocking threshold value at which the fire confirmation is determined to increase the sensitivity.

(Threshold change from 3 types of sensitivity to 2 types of sensitivity)
In the fire alarm control unit, a threshold value equivalent to two types of sensitivity is preset as a fire alarm threshold value.
In the interlocking control unit, threshold values corresponding to three types of sensitivities are preset as interlocking thresholds.
When the fire alarm control unit determines that the fire is confirmed, the sensitivity change unit changes the threshold value equivalent to the three types of sensitivity set in the interlocking control unit to the same threshold value equivalent to the two types of sensitivity set in the fire alarm control unit. To do.

(Fire confirmation judgment)
When a fire is detected by the detection values of at least two fire alarms, the sensitivity change unit sends a fire alarm signal from the transmitter connected to the signal line as a judgment of the fire confirmation by the fire alarm control unit. When the fire is received, or when the fire determination operation of the fire determination switch provided in the receiver is detected, the fire control unit determines the fire confirmation.

(Change of relay board data of distributed system)
One or more relay boards are connected to the receiver via a network line, and a fire alarm fire detector, an interlocking fire detector, and a predetermined interlocking device are connected to the signal line drawn from the relay board. Ori
On the relay board,
A fire alarm control unit that outputs a fire alarm from the receiver based on the detection value of the fire alarm for fire alarm.
An interlocking control unit that interlocks and controls interlocking equipment based on the detection value of the interlocking fire detector,
When the fire monitoring and control unit determines that a fire has been confirmed, the interlocking control unit changes the sensitivity in a direction that makes it easier to determine that it is a fire.
Is provided.

(Change of fire alarm threshold to increase sensitivity)
When the fire alarm control unit determines the first fire, the sensitivity changing unit changes the fire alarm threshold value to a fire alarm threshold value lower than the fire alarm threshold value at which the fire is determined.

(Basic effect)
The present invention is a fire alarm system in which a fire alarm for fire alarm, a fire detector for interlocking, and a predetermined interlocking device are connected to a signal line drawn from the receiver. Based on the detection value of the detector, for example, the fire alarm control unit that determines that the fire is fire and outputs a fire alarm when it exceeds the predetermined fire alarm threshold or exceeds the fire alarm threshold, and based on the detection value of the interlocking fire detector, for example. An interlocking control unit that determines that a fire is occurring when the interlocking threshold is higher than the fire alarm threshold or exceeds the interlocking threshold and controls the interlocking device in an interlocking manner, and an interlocking control unit that determines that a fire is confirmed by the fire alarm control unit. Since the control unit is provided with a sensitivity change unit that changes the sensitivity in a direction that makes it easier to determine that it is a fire, it is set in advance when the fire alarm control unit determines that the fire is confirmed and there is no doubt that it is a fire. The interlocking threshold is changed to a higher sensitivity interlocking threshold, for example, the same threshold as the fire alarm threshold of the fire alarm control unit that is determined to be a fire at that time, and the sensitivity is increased. On the other hand, the value detected from the interlocking fire detector is compared with the interlocking threshold changed to high sensitivity, so that the fire can be reliably judged and the smoke prevention equipment such as the fire shutter can be operated by the interlocking control. It is possible to suppress the spread of fire by forming a fire.

(Effect of changing the interlocking threshold to increase sensitivity)
In addition, when the fire alarm control unit determines that the fire is confirmed, the sensitivity change unit changes the interlocking threshold of the interlocking control unit to a lower interlocking threshold value than the interlocking threshold value at which the fire confirmation is determined to increase the sensitivity. For example, the interlocking threshold value of 15% / m for the smoke concentration, which is the detection value of the initially set smoke detector, is changed to a lower interlocking threshold value, for example, the interlocking threshold value of 10% / m to increase the sensitivity, so that the interlocking smoke is increased. It is possible to judge a fire from the detection value of the sensor and operate a fire prevention device such as a fire shutter reliably and promptly.

(Effect of changing the threshold from 3 types of sensitivity to 2 types of sensitivity)
Further, the fire alarm control unit is preset with a threshold value equivalent to two types of sensitivity as the fire alarm threshold value, the interlocking control unit is preset with a threshold value equivalent to three types of sensitivity as the interlocking threshold value, and the sensitivity changing unit is set to fire. When the fire alarm control unit determines that a fire has been confirmed, the threshold value equivalent to the three types of sensitivity set in the interlocking control unit is changed to the same threshold value equivalent to the two types of sensitivity set in the fire alarm control unit. In the case of a sensor, the preset interlocking threshold value of 3 types of sensitivity is changed to 10% / m, and in the case of a thermal sensor, the interlocking threshold value of 2 types of sensitivity is changed to 10% / m. The sensitivity interlocking threshold value of 70 ° C is changed to the interlocking threshold value of 65 ° C. for the 2nd type sensitivity, and the sensitivity is changed from the equivalent of the 3rd type sensitivity to the equivalent of the 2nd type sensitivity, which is higher than that. It is possible to operate disaster prevention equipment such as a fire shutter reliably and promptly.

(Effect of fire confirmation judgment)
In addition, the sensitivity change unit determines that the fire is confirmed (true fire) by the fire alarm control unit, and when a fire is detected by the detection values of at least two fire alarm fire detectors, the transmitter connected to the signal line. When a fire report signal is received from, or when a fire determination operation of the fire determination switch provided in the receiver is detected, the fire alarm control unit determines the fire confirmation, so the fire is confirmed. If it is judged, it is definitely a fire and there is no problem of false alarm, so it is possible to increase the sensitivity to the value detected from the interlocking fire detector and operate the fire prevention equipment such as the fire shutter reliably and promptly. ..

(Effect of the relay board of the distributed system)
In addition, one or more relay boards are connected to the receiver via a network line, and a fire alarm fire detector, an interlocking fire detector, and a predetermined interlocking device are connected to the signal line drawn from the relay board. Based on the detection value of the fire alarm for fire alarm, for example, if the fire alarm is above or above the predetermined fire alarm threshold or exceeds the fire alarm threshold, the relay board determines that it is a fire and outputs a fire alarm from the receiver. A control unit, an interlocking control unit that determines that a fire occurs and controls the interlocking device in an interlocking manner when, for example, a predetermined interlocking threshold higher than the fire alarm threshold or exceeds the interlocking threshold based on the detection value of the interlocking fire detector. When the fire monitoring and control unit determines that a fire has been confirmed, the interlocking control unit is provided with a sensitivity change unit that changes the sensitivity in a direction that makes it easier to determine a fire. Even in a so-called distributed system to which the relay board is connected, it is set in advance when a fire is confirmed in the relay board based on the detection value from the fire alarm for fire alarm connected to the signal line of the relay board. The interlocking threshold is changed to a lower interlocking threshold to increase the sensitivity, and as a result, the value detected from the interlocking fire detector is compared with the interlocking threshold changed to a higher sensitivity for a fire during fire spread. Therefore, it is definitely judged that the fire is a fire, and the smoke prevention equipment such as the fire shutter connected to the signal line from the relay board is surely operated by interlocking control, and the spread of the fire is suppressed by forming a fire prevention section. Is possible.

(Effect of changing the fire alarm threshold to increase sensitivity)
In addition, when the fire alarm control unit determines the first fire, the sensitivity change unit changes the fire alarm threshold to a fire alarm threshold lower than the fire alarm threshold for which the fire was determined to increase the sensitivity. For example, the fire alarm control unit is preset with a threshold value corresponding to the type 2 sensitivity as the fire threshold value, and the sensitivity changing unit is equivalent to the type 2 sensitivity when the fire alarm control unit determines the first fire. When the threshold value is changed to a threshold value equivalent to type 1 sensitivity and the fire alarm control unit determines the first fire from the detection value of the fire alarm fire detector and gives an alarm, the fire alarm threshold value is equivalent to, for example, type 2 sensitivity. By increasing the sensitivity by changing from the threshold value of 1 to the threshold value corresponding to the type 1 sensitivity, it is possible to quickly determine the fire after the second report with respect to the spread of the fire. As a result, the confirmation of the fire is determined at an early stage, the sensitivity of the interlocking threshold is increased, and the disaster prevention equipment such as the fire shutter can be operated reliably and promptly against the spread of the fire.

Explanatory drawing which showed embodiment of fire alarm equipment Explanatory drawing showing the relationship between the sensitivity of the smoke detector and the smoke concentration threshold for judging a fire. The flowchart which showed the control which collects the detection value of the fire detector by the sub CPU of FIG. Flow chart showing the change of fire alarm control, interlocking control and interlocking threshold by the main CPU Explanatory drawing showing the relationship between the sensitivity of the heat sensor and the temperature threshold for judging a fire. Explanatory drawing showing a list of fire alarm thresholds changed by the first fire judgment together with caution display threshold values and interlocking threshold values. Explanatory diagram showing an embodiment of a fire alarm system constituting a distributed system in which a relay board is connected to a receiver by a communication line.

[Fire alarm system]
(Overview of fire alarm system)
FIG. 1 is an explanatory diagram showing an embodiment of a fire alarm system. As shown in FIG. 1, for example, an R-type receiver 10 is installed in a monitoring center or management room of a facility such as a large warehouse where a fire alarm system is installed, and the receiver 10 is connected to the caution area for each system. The signal lines 12-1 to 12-3 are pulled out separately.

A plurality of analog fire alarms 14-1 for fire alarms having a transmission function with a unique address set are connected to the signal line 12-1, and for fire alarms having a transmission function with a unique address set. The on / off fire detector 18 and the transmitter 20 are connected to the detector line 17 drawn from the repeater 16-1.

A plurality of interlocking analog fire detectors 14-2 having a transmission function with a unique address set are connected to the signal line 12-2, and an addressable transmitter having a transmission function with a unique address set. 22 is connected.

Further, the fire shutter 24 is connected to the signal line 12-3 via an interlocking repeater 16-2 having a transmission function in which a unique address is set.

Here, the analog fire detector 14-1 for fire alarm and the analog fire detector 14-2 for interlocking use, for example, an analog smoke detector, detect the smoke concentration associated with the fire, and smoke as an analog detection value. Output density data. In the following description, the smoke concentration data may be simply referred to as smoke concentration.

An analog heat detector may be used as the analog fire detector 14-1 for fire alarm and the analog fire detector 14-2 for interlocking, and the analog heat detector detects the temperature associated with the fire and detects the analog. Output temperature data as a value.

In addition, for example, a caution display threshold value (smoke concentration threshold value) equivalent to type 1 sensitivity is set in the analog fire detector 14-1 for fire alarm, and if the detected value exceeds the caution display threshold value or exceeds the caution display threshold value, a fire interrupt occurs. Send a signal. In the following description, the transmission of a fire interrupt signal by an analog sensor may be referred to as a fire alarm.

Further, the analog fire detector 14-1 for fire alarm, the repeater 16-1 for fire alarm, the analog fire detector 14-2 for interlocking, and the repeater 16 for interlocking connected to the signal lines 12-1 to 12-3. The maximum number of addresses for each line set for a terminal device such as -2 is, for example, 255, and a maximum of 255 terminal devices can be connected to each of the signal lines 12-1 to 12-3.

(Functional configuration of receiver)
The receiver 10 is provided with a main CPU 26 and a plurality of sub CPU boards 28-1 to 28-3, and the sub CPU boards 28-1 to 28-3 have sub CPUs 30-1 to 30-3 and a transmission unit 32-. 1-32-3 are provided.

The main CPU 26 and the sub CPUs 30-1 to 30-3 are connected by a serial transfer bus 34, and transmit and receive data to and from each other.

The main CPU 26 is necessary for fire monitoring of a display 36 with a touch panel using a liquid crystal display panel or the like, a display unit 38 provided with a representative light for fire, gas leak, or obstacle, an LED indicator light, etc., and a fire determination switch. An operation unit 40 provided with various switches, an acoustic alarm unit 42 provided with a speaker, and a report transfer unit 44 are connected.

The main CPU 26 is provided with a fire alarm control unit 46, an interlocking control unit 48, and a sensitivity changing unit 50 as functions realized by executing a program.

The sub CPUs 30-1 and 30-2 of the sub CPU boards 28-1 and 28-2 are the analog detector 14-1 for fire alarm and the analog sensor for interlocking connected to the respective signal lines 12-1 and 12-2. Control is performed to collect the detected values of the device 14-2.

(Collection of sensor detection data and fire alarm control)
The sub CPU 30-1 of the sub CPU board 28-1 instructs the transmission unit 32-1 to send and receive a signal to and from the analog fire detector 14-1 for a fire alarm according to a predetermined communication protocol, thereby transmitting and receiving detection data. Is controlled to collect.

The downlink signal from the transmission unit 32-1 to the analog fire detector 14-1 for fire alarm is transmitted in the voltage mode. The signal in this voltage mode is transmitted as a voltage pulse that changes the line voltage of the signal line 12-1 between, for example, 18 and 30 volts.

On the other hand, the uplink signal from the fire alarm analog fire detector 14-1 to the transmission unit 32-1 is transmitted in the current mode. In this current mode, a signal current is passed through the signal line 12-1 at the timing of bit 1 of the transmission data, and an uplink signal is transmitted to the receiver 10 as a so-called current pulse train.

The data collection control by the sub CPU 30-1 instructs the transmission unit 32-1 at regular intervals during normal monitoring to transmit a broadcast batch AD conversion signal including a batch AD conversion command. Upon receiving this batch AD conversion signal, the fire alarm analog fire detector 14-1 changes the analog smoke concentration signal output from the smoke detector into a digital smoke concentration signal by AD conversion and holds it as detection data. .. Subsequently, the sub CPU 30-1 transmits a call signal including a polling command in which terminal addresses are sequentially specified.

When the analog fire detector 14-1 for fire alarm receives a call signal having an address matching its own address, it transmits a response signal including smoke concentration data held at that time to the transmission unit 32-1 of the receiver 10. To do.

Further, the analog fire detector 14-1 for fire alarm is set with, for example, a smoke concentration threshold corresponding to type 1 sensitivity, for example, a smoke concentration threshold of 5.0% / m as a caution display threshold, and the detected smoke concentration data. Is equal to or greater than the caution display threshold or exceeds the caution display threshold, it is determined that a fire has been triggered, and a fire interrupt signal is transmitted to the transmission unit 32-1 of the receiver 10.

When the sub CPU 30-1 receives the fire interrupt signal via the transmission unit 32-1, it transmits a group search command signal to identify the group including the fire alarm analog fire detector 14-1 that has issued a fire, and then continues. Then, the search command signal within the group is transmitted to identify the address of the fire alarm analog fire detector 14-1 that has issued a fire, and the smoke concentration data is intensively collected, and the main CPU 26 is via the serial transfer bus 34. Send to.

The intensive collection of smoke concentration by the sub CPU 30-1 shortens the transmission cycle of the batch AD conversion signal, and the address of the fire alarm analog fire detector 14-1 that issued a fire after transmitting the batch AD conversion signal is used. By transmitting the specified ringing signal, only the smoke concentration data of the analog fire detector 14-1 for fire alarm is continuously collected.

The fire alarm control unit 46 of the main CPU 26 compares the smoke concentration data for the fire alarm received from the sub CPU 30-1 with a predetermined fire alarm threshold corresponding to the two types of sensitivity, for example, a fire alarm threshold of 10% / m. When the smoke concentration is equal to or higher than the fire alarm threshold or exceeds the fire alarm threshold, it is judged as a fire and fire alarm control is performed.

In the fire alarm control by the fire alarm control unit 46, the fire representative light of the display unit 38 is turned on, a predetermined main acoustic alarm indicating the occurrence of a fire is output from the speaker of the acoustic alarm unit 42, and a fire is detected on the display 36. Fire alarm information including the location of the fire is displayed based on the sensor address, and the fire transfer signal is output to the outside by the transfer unit 44 to perform predetermined transfer control and the like.

(Collection of sensor detection data and interlocking control)
The sub CPU 30-2 of the sub CPU board 28-2 collects detection data by instructing the transmission unit 32-2 to send and receive a signal to and from the interlocking analog fire detector 14-2 according to a predetermined communication protocol. Control is performed.

The data collection control by the sub CPU 30-2 is the same as that of the sub CPU 30-1, and during normal monitoring, a broadcast including a batch AD conversion command is instructed to the transmission unit 32-2 at regular intervals. The interlocking analog fire detector 14-2 that transmits the batch AD conversion signal of the above and receives the batch AD conversion signal detects and holds the smoke concentration data as detection data. Subsequently, the sub CPU 30-2 transmits a call signal including a polling command in which terminal addresses are sequentially specified.

When the interlocking analog fire detector 14-2 receives a call signal having an address matching its own address, it transmits a response signal including smoke concentration data held at that time to the transmission unit 32-2.

Further, the interlocking analog fire detector 14-2 has a smoke concentration threshold value of 5% / m, which is equivalent to the same type 1 sensitivity as the caution display threshold value of the fire alarm analog fire detector 14-1. If the detected smoke concentration is equal to or higher than the caution display threshold value or exceeds the caution display threshold value, it is determined that a fire has been triggered, and a fire interruption signal is transmitted to the transmission unit 32-2. In the interlocking analog fire detector 14-2, the caution display threshold value may be a smoke concentration threshold value corresponding to the type 2 sensitivity, for example, 10% / m, in addition to the smoke concentration threshold value corresponding to the type 1 sensitivity.

When the sub CPU 30-2 receives the fire interrupt signal via the transmission unit 32-2, the sub CPU 30-2 transmits a group search command signal to identify the group including the interlocking analog fire detector 14-2 that has issued a fire, and subsequently. , The address of the interlocking analog fire detector 14-2 that reported the fire by transmitting the search command signal in the group is specified, the smoke concentration data is intensively collected, and transmitted to the main CPU 26 via the serial transfer bus 34. To do.

The interlocking control unit 48 of the main CPU 26 compares the interlocking smoke concentration received from the sub CPU 30-2 with a predetermined interlocking threshold value corresponding to three types of sensitivities, for example, an interlocking threshold value of 15% / m, and the smoke concentration is the interlocking threshold value. When the above or the interlocking threshold value is exceeded, it is determined that the fire has occurred, and interlocking control is performed to close the fire prevention shutter 24.

The interlocking control of the interlocking control unit 48 is an interlocking relay to which the fire prevention shutter 24, which is the interlocking destination, is connected from the interlocking information stored in advance corresponding to the address of the interlocking analog fire detector 14-2 that has determined the fire. The address of the device 16-2 is searched, and the sub CPU 30-3 is instructed to perform interlocking control in which the interlocking destination address is specified.

Upon receiving the interlocking control instruction from the main CPU 26, the sub CPU 30-3 transmits a shutter control signal instructing the transmission unit 32-3 to specify the interlocking destination address to the signal line 12-3, and the shutter control signal is the self-address. The fire shutter 24 is closed and driven to be received by the interlocking repeater 16-2 corresponding to the above, and the fire door section is formed.

(Sensitivity change control)
When the fire alarm control unit 46 determines that the fire is confirmed, the sensitivity changing unit 50 of the main CPU 26 sets the interlocking threshold value of the interlocking control unit 48 in a direction that makes it easier to determine that the fire is determined, for example, the interlocking threshold value that the fire confirmation is determined. Control is performed to increase the sensitivity by changing to a lower interlocking threshold.

Here, since the interlocking threshold value of 15% / m corresponding to the three types of sensitivities is preset in the interlocking control unit 48, the sensitivity changing unit 50 is determined by the fire alarm control unit 46 to confirm the fire. In this case, the interlocking threshold value of 15% / m equivalent to the three types of sensitivity set in the interlocking control unit 48 is changed to, for example, the interlocking threshold value of 10% / m equivalent to the same type two sensitivity set in the fire alarm control unit 46. Control to change.

The fire alarm control unit 46 may determine the fire confirmation for changing the interlocking threshold value of the interlocking control unit 48 by the sensitivity changing unit 50 as follows.

(1) When a fire is judged based on the detection values of at least two analog fire detectors 14-1 for fire alarms, that is, when the first and second fires are judged.

(2) When a fire communication signal is received from the transmitter 20 or the addressable transmitter 22 connected to the signal line, that is, when a fire notification operation is artificially performed.

(3) When the fire determination operation of the fire determination switch provided in the operation unit 40 of the receiver 10 is detected.

In addition to this, the smoke concentration of the first analog fire detector 14-1 for fire alarm that issued a fire exceeded a smoke concentration sufficient to determine that the fire was confirmed, for example, the upper limit of the threshold value corresponding to the sensitivity of 3 types. In some cases, it may be determined that the fire has been confirmed.

When the fire control unit 48 determines that the fire is confirmed, it is definitely a fire, there is no problem of false alarm, and a fire alarm is also output. Therefore, the interlocking threshold for operating the fire prevention shutter 24 There is no reason to set the value to a lower sensitivity value higher than the fire alarm threshold for outputting a fire alarm and evacuating, and the interlocking threshold is changed to a threshold that is the same as or lower than the fire alarm threshold. By doing so, the sensitivity for operating the fire prevention shutter 24 is increased, and the fire is judged from the smoke concentration detected by the interlocking analog fire detector 14-2 and the fire prevention shutter 24 is closed and driven. Control is performed to form a fire prevention section and suppress the spread of fire.

(Analog smoke detector sensitivity and threshold)
FIG. 2 is an explanatory diagram showing a list of the relationship between the sensitivity of the smoke detector and the smoke concentration threshold for determining a fire, and FIG. 2 (A) shows the threshold and the threshold range corresponding to the sensitivity of the smoke detector. 2 (B) shows the smoke concentration for normal monitoring and fire confirmation monitoring for the threshold type when an analog smoke detector is used as the fire alarm analog fire detector 14-1 and the interlocking analog fire detector 14-2 in FIG. Indicates a threshold.

As shown in FIG. 2 (A), in a generally used on-off type smoke detector, a smoke concentration threshold value of 5.0% / m is set as a type 1 sensitivity, and 2 if necessary. It is possible to change the smoke concentration threshold value in the range of 5.5% / m or more and less than 7.5% / m, and the threshold value in this range is called the threshold value corresponding to the type 1 sensitivity.

In addition, the smoke concentration threshold of 10.0% / m is set for the two types of sensitivity of the on-off type smoke detector, and the smoke concentration threshold is set in the range of 7.5% / m or more and less than 12.5% / m as necessary. Is possible to change, and the threshold value in this range is called the threshold value corresponding to the two types of sensitivity.

Further, the smoke concentration threshold value of 15.0% / m is set for the three types of sensitivity of the on-off type smoke detector, and the smoke concentration threshold value is set in the range of 12.5% / m or more and less than 17.5% / m as necessary. Is possible to change, and the threshold value in this range is called the threshold value corresponding to the three types of sensitivity.

As shown in FIG. 2 (B), a caution display for transmitting the fire interruption signal set in the fire alarm analog fire detector 14-1 and the interlocking analog fire detector 14-2 shown in FIG. The threshold value is set to, for example, a smoke concentration of 5.0% / m, which is equivalent to the type 1 sensitivity, for both the normal monitoring and the fire confirmation monitoring, and fire detection is performed with a high sensitivity of the type 1 sensitivity.

Further, the fire alarm threshold value used for fire determination of the fire alarm control unit 46 provided in the receiver 10 of FIG. 1 is, for example, a smoke concentration of 10.0% / m for both normal monitoring and fire confirmation monitoring. It is set to correspond to two types of sensitivity.

Further, the interlocking threshold value used for fire judgment of the interlocking control unit 48 provided in the receiver 10 of FIG. 1 is set to, for example, a smoke concentration of 15.0% / m in normal monitoring, which corresponds to three types of sensitivity. In the fire confirmation monitoring, the sensitivity changing unit 50 changes the smoke concentration to 10.0% / m, which is equivalent to the two types of sensitivity, which is higher than the normal monitoring.

The smoke concentration of 10.0% / m corresponding to the two types of sensitivity, which is changed by the sensitivity changing unit 50 when the fire is confirmed, is an example, and is a high-sensitivity interlocking threshold value smaller than the interlocking threshold value of normal monitoring. For example, the threshold range of the two types of sensitivity shown in FIG. 2A may be any value between 7.5% / m and more and less than 12.5% / m. Further, the interlocking threshold value to be changed is not limited to the threshold range of the two-type sensitivity, and the smoke concentration is 12.5% / m or more and 15.0%, which is smaller than the smoke concentration of 15.0% / m corresponding to the three-type sensitivity of normal monitoring. The smoke concentration may be changed to less than / m, which is equivalent to the sensitivity of 3 types.

(Sub CPU control).

FIG. 3 is a flowchart showing the control of collecting the detected values of the analog fire detector by the sub CPU of FIG. 1, and is as follows, for example, taking the sub CPU 30-1 as an example.

As shown in FIG. 3, the sub CPU 30-1 controls the call of the terminal including the fire alarm analog fire detector 14-1 connected to the signal line 12-1 in step S1. As described above, this terminal call control is a call signal including a poll command in which a batch AD conversion signal is transmitted to cause the analog fire detector 14-1 for fire alarm to hold smoke concentration data, and terminal addresses are sequentially specified. Smoke concentration data is acquired by receiving a response signal for transmission.

Subsequently, the sub CPU 30-1 determines whether or not the fire interrupt signal transmitted by the fire alarm is received in step S2, and if it determines the reception of the fire interrupt signal, the process proceeds to step S3 and the address search command signal is transmitted. Searches for the address of the analog fire detector 14-1 for fire alarm that has been fired by, and notifies the main CPU 26 of the detector alarm information indicating that the address and type of the alarm detector are for fire alarm in step S4. To do.

Subsequently, the sub CPU 30-1 proceeds to step S5, shortens the transmission cycle of the batch AD conversion signal, and transmits a call signal specifying only the address of the alarm detector to detect a fire alarm analog fire. The smoke concentration data of the device 14-1 is intensively collected and notified to the main CPU 26.

Subsequently, the sub CPU 30-1 repeats the process from step S1 until it determines the recovery by operating the recovery switch of the receiver 10 in step S6, and receives a new fire interrupt signal which is the second report. When the reception is determined, the address is searched and the smoke concentration data is intensively collected, and the smoke concentration data corresponding to the first report and the second report is collected and transmitted to the main CPU 26.

When the sub CPU 30-1 determines the recovery in step S6, the sub CPU 30-1 proceeds to step S7 to perform a predetermined recovery control, and then returns to the normal monitoring by the terminal call control in step S1.

Further, the sub CPU 30-2 performs the same control as shown in FIG. 3 for the interlocking analog fire detector 14-2 connected to the signal line 12-2.

(Main CPU control)
FIG. 4 is a flowchart showing the fire alarm control, the interlocking control, and the change of the interlocking threshold value by the main CPU.

As shown in FIG. 4, when the main CPU 26 determines in step S11 that the sensor alarm information has been received from the sub CPU 30-1 or the sub CPU 30-2, the main CPU 26 proceeds to step S12, and proceeds to the display 36, the display unit 38, and the acoustic alarm unit. By 42, a caution display indicating a fire alarm of the sensor and a predetermined caution alarm sound are output to notify that the risk of fire is increasing.

Subsequently, when the main CPU 26 determines in step S13 that the detection value of the alarm detector transmitted from the sub CPU 30-1 or the sub CPU 30-2 has been received, the process proceeds to step S14 and determines that the detector type is a fire alarm. Then, the fire alarm detection value is compared with the fire alarm threshold, for example, the fire alarm threshold of 10% / m in step S15, and if the fire alarm detection value is equal to or higher than the fire alarm threshold or exceeds the fire alarm threshold, a fire is generated in step S16. Is determined, and the process proceeds to step S17 to output a fire alarm.

Subsequently, the main CPU 30 proceeds to step S18, and when the fire confirmation is determined by the second fire determination, the reception of the fire notification signal from the transmitter, or the detection of the operation of the fire confirmation switch, the process proceeds to step S19. The interlocking threshold value of 15% / m corresponding to the seed sensitivity is changed to the interlocking threshold value of 10% / m corresponding to the type 2 sensitivity, and the interlocking threshold value is changed to a low value so as to increase the sensitivity.

On the other hand, when the main CPU 26 determines in step S14 that the sensor type is for interlocking, the process proceeds to step S20, the interlocking detection value is compared with the interlocking threshold value, and the interlocking detection value is equal to or higher than the interlocking threshold value or the interlocking threshold value in step S21. When a fire is determined by exceeding the above, the process proceeds to step S22, and the fire shutter 24 is closed and driven by interlocking control to form a fire section.

Here, the interlocking threshold value to be compared with the interlocking detection value in step S20 is higher than the interlocking threshold value of 15% / m corresponding to the three types of sensitivity up to that point in step S18, and the interlocking threshold value corresponding to the two types of sensitivity is 10% /. When it was changed to m, the interlocking detection value was compared with the interlocking threshold value of 10% / m corresponding to the two types of sensitivity after the change in step S20, and when the smoke concentration detected by the alarm detector was low. When a fire is determined and the fire is confirmed, the fire shutter 24 can be reliably closed and driven by an early fire determination.

The main CPU 26 repeats the process from step S13 until the recovery by the operation of the recovery switch is determined in step S23. When the recovery is determined, the main CPU 26 proceeds to step S24 to perform predetermined recovery control, and then from step S11. Return to the processing of.

[Embodiment using an analog heat sensor]
As the analog fire detector 14-1 for fire alarm and the analog fire detector 14-2 for interlocking connected to the signal lines 12-1 and 12-2 drawn from the receiver 10 of FIG. An analog heat detector that detects the temperature when it is received can also be used.

FIG. 5 is an explanatory diagram showing a list of the relationship between the sensitivity of the heat detector and the temperature threshold for determining a fire, and FIG. 5 (A) shows the threshold and the threshold range corresponding to the sensitivity of the heat detector, and FIG. (B) shows the temperature thresholds for normal monitoring and fire confirmation monitoring for the threshold type when an analog heat detector is used as the fire alarm analog fire detector 14-1 and the interlocking analog fire detector 14-2 in FIG. Shown.

As shown in FIG. 5 (A), in a generally used on-off type heat detector, 55 ° C. is set as a type 1 sensitivity, and if necessary, a range of 45 ° C. or higher and lower than 60 ° C. It is possible to change with, and the threshold value in this range is called the threshold value corresponding to the type 1 sensitivity.

In addition, the sensitivity of the two types of on-off type heat detectors is set to 65 ° C, and can be changed in the range of 60 ° C or more and less than 67.5 ° C as needed. It is called a threshold value equivalent to sensitivity.

Furthermore, the sensitivity of the three types of on-off type heat detectors is set to 70 ° C, and can be changed in the range of 67.5 ° C or more and less than 72.5 ° C as needed, and the threshold value in this range can be changed. It is called a threshold value equivalent to three types of sensitivity.

As shown in FIG. 5 (B), a caution display for transmitting a fire interruption signal set in the fire alarm analog fire detector 14-1 and the interlocking analog fire detector 14-2 shown in FIG. The threshold value is set to, for example, a temperature threshold of 65 ° C., which is equivalent to the type 1 sensitivity, for both the normal monitoring and the fire confirmation monitoring, and fire detection is performed with a high sensitivity of the type 1 sensitivity.

Further, the fire alarm threshold value used for fire determination of the fire alarm control unit 46 provided in the receiver 10 of FIG. 1 is equivalent to, for example, a temperature threshold value of 65 ° C. and two types of sensitivity for both normal monitoring and fire confirmation monitoring. Is set to.

Further, the interlocking threshold value used for fire determination of the interlocking control unit 48 provided in the receiver 10 of FIG. 1 is set to, for example, a temperature threshold value of 70 ° C., which is equivalent to three types of sensitivity in normal monitoring, but fire confirmation monitoring is performed. Then, the sensitivity changing unit 50 changes the temperature threshold value to 65 ° C., which is equivalent to the two types of sensitivity, which is highly sensitive to normal monitoring.

The temperature threshold value of 55 ° C. corresponding to the two types of sensitivity, which is changed by the sensitivity changing unit 50 when the fire is confirmed, is an example, and if the interlocking threshold value of normal monitoring is changed to a higher sensitivity interlocking threshold value smaller than that. It is good, for example, it may be any value between the threshold range of 60.0 ° C. or higher and lower than 67.5 ° C. of the two types of sensitivity shown in FIG. 5 (A). Further, the interlocking threshold value to be changed is not limited to the threshold range of the two-type sensitivity, and the smoke concentration is equivalent to the three-type sensitivity of 67.5 ° C or more and less than 70 ° C, which is lower than the temperature threshold of 70 ° C corresponding to the three-type sensitivity of normal monitoring. Including when changing.

As described above, even when an analog heat detector is used as the fire alarm analog fire detector 14-1 and the interlocking analog fire detector 14-2 in FIG. 1, it is determined that the fire is confirmed and the fire is caused. If there is no doubt, the temperature threshold corresponding to the preset 3 types of sensitivity for interlocking is the temperature threshold equivalent to the 2 types of sensitivity higher than that, for example, the temperature of the 2 types of sensitivity used to judge the fire at that time. The sensitivity is increased by changing to the same threshold as the threshold, and as a result, the detection value from the interlocking analog fire detector 14-2 due to the fire during the spread of fire is compared with the temperature threshold changed to the higher sensitivity. It is definitely determined that there is a fire, and the fire prevention shutter 24 is operated by interlocking control, and it is possible to suppress the spread of fire by forming a fire prevention section.

[Embodiment of changing the threshold value for fire alarm]
The sensitivity changing unit 50 provided in the main CPU 26 of the receiver 10 shown in FIG. 1 sets the interlocking threshold value of the interlocking control unit 48 to a lower interlocking threshold value when the fire alarm control unit 46 determines that the fire is confirmed. Although it is changed to increase the sensitivity, as another embodiment, the sensitivity changing unit 50 determines the fire alarm threshold of the fire alarm control unit 46 when the fire alarm control unit 46 determines the first fire. May be controlled to increase the sensitivity by changing the value to a lower fire alarm threshold.

FIG. 6 is an explanatory diagram showing a list of fire alarm thresholds changed by the first fire judgment together with a caution display threshold value and an interlocking threshold value, and FIG. 6 (A) shows a case of an analog smoke detector, FIG. (B) shows the case of an analog heat detector.

When an analog smoke detector is used as the fire alarm analog fire detector 14-1 and the interlocking analog fire detector 14-2 of FIG. 1, the fire alarm control unit 46 of the receiver 10 is shown in FIG. 6 (A). ), A smoke concentration threshold of 10.0% / m corresponding to the two types of sensitivity is set as a fire alarm threshold during normal monitoring.

When the fire alarm control unit 46 determines the first fire, the sensitivity changing unit 50 sets the smoke concentration threshold value of 10% / m, which is equivalent to the two types of sensitivities, set as the fire alarm threshold value to, for example, 1. The sensitivity is increased by changing the smoke concentration threshold value corresponding to the seed sensitivity to 7.5% / m.

On the other hand, when an analog heat detector is used as the fire alarm analog fire detector 14-1 and the interlocking analog fire detector 14-2 in FIG. 1, the fire alarm control unit 46 of the receiver 10 is shown in FIG. As shown in (B), a temperature threshold of 65 ° C. corresponding to two types of sensitivity is set as a fire alarm threshold during normal monitoring.

When the fire alarm control unit 46 determines that the first fire is fired, the sensitivity changing unit 50 sets the temperature threshold value of 65 ° C., which is equivalent to the type 2 sensitivity, which has been set as the fire alarm threshold value, to, for example, the type 1 sensitivity. The temperature threshold is changed to 57.5 ° C. to increase the sensitivity.

When the fire alarm control unit 46 determines the first fire in this way, the sensitivity changing unit 50 changes the fire alarm threshold value corresponding to, for example, the type 2 sensitivity to the fire alarm threshold value equivalent to the type 1 sensitivity to increase the sensitivity. By increasing the value, it is possible to quickly determine the fire after the second report regarding the spread of the fire.

If the fire report control unit 46 accelerates the judgment of the second fire, the judgment of the fire confirmation based on this is also accelerated, and the sensitivity change unit 50 makes a change to increase the sensitivity of the interlocking threshold value at an early stage, which ensures the spread of the fire. Moreover, the fire shutter can be quickly closed and driven.

[Embodiment of a distributed system composed of a receiver and a relay board]
FIG. 7 is an explanatory diagram showing an embodiment of a fire alarm system constituting a distributed system in which a relay board is connected to a receiver by a network line.

When the facility to be monitored is divided into a plurality of warehouses and becomes large-scale, as shown in FIG. 7, in addition to the receiver 10 installed in the disaster prevention center or the like, for example, the relay board 100 is divided into each warehouse. Is installed, and a communication connection is made between the receiver 10 and the relay board 100 by a network line 104 such as Ethernet (registered trademark).

The receiver 10 is the same as shown in FIG. 1, whereas the relay board 100 excludes the operation display function including the display 36, the display unit 38, the operation unit 40, and the acoustic alarm unit 42 from the receiver 10 in FIG. Other than that, it is basically the same as the receiver 10, and further, the functions of the fire alarm control unit 146, the interlocking control unit 148, and the sensitivity changing unit 150 are provided.

Signal lines 102-1 to 102-3 are pulled out from the relay board 100, a fire alarm analog fire detector 14-1 is connected to the signal line 102-1, and an interlocking analog fire is connected to the signal line 102-2. The detector 14-2 is connected, and the fire shutter 24 is connected to the signal line 102-3 via the interlocking repeater 16-2.

The fire alarm control unit 146 of the relay board 100 determines that the fire is caused when the detection value of the fire alarm analog fire detector 14-1 is, for example, equal to or higher than the predetermined fire alarm threshold value corresponding to the two types of sensitivity or exceeds the fire alarm threshold value. , Instruct the receiver 10 to output a fire alarm.

Further, the interlocking control unit 148 of the relay board 100 fires when the detection value of the interlocking analog fire detector 14-2 is higher than the fire alarm threshold value, for example, equal to or higher than a predetermined interlocking threshold value corresponding to the three types of sensitivity or exceeds the interlocking threshold value. The fire shutter 24 is closed and driven to form a fire prevention section by transmitting a control signal specifying the address of the interlocking repeater 16-2 having an interlocking relationship.

Further, when the fire monitoring control unit 146 determines that the fire is confirmed, the sensitivity changing unit 150 of the relay board 100 sets the interlocking threshold value equivalent to the type 3 sensitivity set in the interlocking control unit 148 to correspond to the type 2 sensitivity. Increase the sensitivity by changing to a predetermined interlocking threshold.

Even in a distributed system in which the relay board 100 is connected to the receiver 10 via the network line 104, the fire alarm analog fire detector 14 connected to the signal line 102-1 from the relay board 100 When a fire is confirmed on the relay board 100 based on the detection value from -1, the preset interlocking threshold is changed to a lower interlocking threshold to increase the sensitivity, and as a result, the fire during the spread of fire is dealt with. By comparing the detection value from the interlocking analog fire detector 14-2 with the interlocking threshold changed to high sensitivity, it is definitely judged as a fire and the interlocking relay to the signal line 102-3 from the relay board 100. The fire prevention shutter 24 connected via the vessel 16-2 is surely operated by interlocking control, and it is possible to suppress the spread of fire by forming a fire prevention section or the like.

As for the relay board 100, the embodiment of the analog heat detector shown in FIG. 5 and the embodiment of changing the fire alarm threshold shown in FIG. 6 are applied in the same manner as in the case of the receiver.

[Modification of the present invention]
(Terminal device)
In the above embodiment, a fire prevention shutter is taken as an example of a terminal device to be interlocked and controlled, but in addition to this, interlocking control for an appropriate disaster prevention device such as a fire door and a smoke exhaust damper is included.

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

10: Receivers 12-1 to 12-3, 102-1 to 102-3: Signal line 14-1: Analog fire detector for fire alarm 14-2: Analog fire detector for interlocking 16-1: For fire alarm Repeater 16-2: Interlocking repeater 17: Sensor line 18: On / off Fire detector 20: Transmitter 22: Addressable transmitter 24: Fire shutter 26: Main CPU
28-1 to 28-3: Sub CPU board 30-1 to 30-3: Sub CPU
32-1 to 2-3: Transmission unit 34: Serial transfer bus 36: Display 38: Display unit 40: Operation unit 42: Acoustic alarm unit 44: Transfer unit 46, 146: Fire alarm control unit 48, 148: Interlocking control Units 50 and 150: Sensitivity change unit 100: Relay board 104: Network line

Claims (6)

In a fire alarm system in which a receiver, a fire alarm for fire alarms, a fire detector for interlocking, and a predetermined interlocking device are connected.
To the receiver
A fire alarm control unit that outputs a fire alarm based on the detection value of the fire alarm for fire alarm,
An interlocking control unit that interlocks and controls the interlocking device based on the detection value of the interlocking fire detector,
When the fire alarm control unit determines that a fire has been confirmed, the interlocking control unit changes the sensitivity in a direction that makes it easier to determine a fire.
A fire alarm system characterized by the fact that
In the fire alarm system according to claim 1, when the fire alarm control unit determines the fire confirmation, the sensitivity changing unit sets the interlocking threshold value of the interlocking control unit from the interlocking threshold value at which the fire confirmation is determined. A fire alarm system characterized by changing to a lower interlocking threshold to increase sensitivity.
In the fire alarm system according to claim 2,
In the fire alarm control unit, a threshold value corresponding to two types of sensitivity is preset as the fire threshold value.
In the interlocking control unit, threshold values corresponding to three types of sensitivities are preset as the interlocking thresholds.
When the fire alarm control unit determines that the fire is confirmed, the sensitivity change unit sets the threshold value corresponding to the three types of sensitivity set in the interlocking control unit to the same two types as those set in the fire alarm control unit. A fire alarm system characterized by changing to a threshold value equivalent to sensitivity.
In the fire alarm system according to any one of claims 1 to 3, the sensitivity changing unit detects at least two fire alarm fire detectors as a determination of the fire confirmation by the fire alarm control unit. When a fire is detected by the value, a fire alarm signal from a transmitter connected to the signal line is received, or a fire determination operation of the fire determination switch provided in the receiver is detected, the above A fire alarm system characterized by the fire alarm control unit determining the confirmation of a fire.
In the fire alarm system according to claim 1,
One or more relay boards are connected to the receiver via a network line, and a fire alarm fire detector, an interlocking fire detector, and a predetermined interlocking device are connected to the signal line drawn from the relay board. Has been
On the relay board
A fire alarm control unit that outputs a fire alarm from the receiver based on the detection value of the fire alarm for fire alarm.
An interlocking control unit that interlocks and controls the interlocking device based on the detection value of the interlocking fire detector,
When the fire monitoring and control unit determines that a fire has been confirmed, the interlocking control unit changes the sensitivity in a direction that makes it easier to determine that the fire has occurred.
A fire alarm system characterized by the fact that
In the fire alarm system according to claim 1, when the fire alarm control unit determines the first fire, the sensitivity changing unit determines that the fire alarm threshold of the fire alarm control unit is a fire. A fire alarm system characterized by changing to a fire alarm threshold lower than the fire alarm threshold.

Images