JPH0366907B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fire judgment device that monitors the state of smoke diffusion caused by a fire and makes reliable fire judgments without causing false alarms.

(Prior art) Conventionally, fire alarm equipment using smoke detectors
In order to prevent false fire alarms triggered by smoke detector fire-like conditions and increase reliability, two detector lines are installed in the same alarm area, and when a fire alarm is issued on both lines at the same time. It is possible to determine that there is a fire and perform interlocking control of fire alarms and disaster prevention equipment, or to set two levels of detection sensitivity for smoke detection, so that a high-sensitivity alarm signal is followed by a low-sensitivity alarm signal. It is determined that there is a fire when the fire occurs.

However, in the case of the conventional two-line system,
Installing double the number of detectors in the same area complicates equipment construction and increases costs.In addition, in the case of dual-sensitivity smoke detectors, the structure of the smoke detector becomes complicated, and alarm signals for high and low sensitivity are required. There was a problem in that it was necessary to adopt a signal system that could distinguish between the two.

(Objective of the Invention) The present invention has been made in view of the above-mentioned conventional problems, and it is possible to reliably determine a fire without changing the structure of smoke detectors installed in warning areas or increasing the number of detectors. The purpose is to provide a highly reliable fire detection device that can perform

(Structure of the Invention) In order to achieve this object, the present invention provides a fire determination device in which smoke detectors are provided in each of a plurality of warning compartments, and the fire determination device is capable of identifying the warning compartment of the smoke detector that has triggered an alarm.
The arrival time range of smoke between each warning zone during a fire is set in advance based on the smoke flow velocity, and when a warning is issued for any warning zone, the alarm is issued for other warning zones from the time of this warning. It is determined whether the counted time is within the set time range, and when it is within the set time range, a fire alarm is issued and/or interlocked control of fire extinguishing equipment and smoke prevention equipment is activated. It was designed to do this.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention.

First, to explain the configuration, the fire judgment device of the present invention is installed in a receiver 1 in a central monitoring room, etc. In this receiver 1, 2 is an input interface, and smoke detectors installed in each of a plurality of warning zones The sensor lines 3a, 3b, ...3n of the device are connected as inputs,
When a smoke detector alarms, for example, each of the sensor lines 3a to 3h and a common line (not shown) are short-circuited to a low impedance, and an alarm current is passed through the sensor line to send an alarm signal to the receiver 1. I am trying to send it to . In addition, the input interface 2 has a function of restoring a smoke detector that has once triggered an alarm using a reset signal. Specifically, the input interface 2 can restore a smoke detector that has triggered an alarm by temporarily cutting off the power supply to the smoke detector. It can be restored. The output of the input interface 2 is given to a counting judgment section 3 and an alarm display section 4, and the counting judgment section 3 counts the time from the time when a warning is issued for a given warning section to when the alarm is issued for other warning sections.
It has a function of determining whether or not this counted time is within the range of time set by the time setting section 5. In the time setting section 5, which provides a set time serving as a judgment criterion in the counting judgment section 3, the arrival time range of smoke between each warning section in the event of a fire is set in advance based on the flow velocity of smoke.

The output of the counting/judgment section 3 is given to a display section 6 to display the judgment result, and furthermore, the fire extinguishing equipment 8, fire prevention equipment 9, evacuation guidance equipment 10, etc. can be controlled via the output interface 7.

Figure 2 shows an example of how smoke detectors are installed in each security area where the signal line is connected to the input interface 2 in Figure 1, and shows an example of how smoke detectors are installed in each security area A1, A
Detector lines 3a, 3b, . . . 3n are installed for each of the smoke detectors 2, .

Furthermore, the connection of the smoke detectors to the input interface 2 in FIG. 1 is as follows: As shown in FIG.
11b,...11f are connected to the sensor lines 3a to 3f, respectively.
In the case of FIG. 3, a warning section is formed for each of the smoke detectors 11a to 11f, and the size of the warning section does not matter.

Next, the basic principle of fire determination by the count determining section 3 and time setting section 5 in the embodiment shown in FIG. 1 will be explained in detail.

Figure 4 shows the warning area using the first and second floors of a general building as an example, with smoke detectors 11a and 1 on the first floor.
1b is installed, and smoke detectors 11c, 1 are installed on the second floor.
1d is installed.

For example, if a fire occurs near the smoke detector 11a on the first floor in such a warning area, the smoke from the fire will spread horizontally along the ceiling and also vertically from the first floor to the second floor. First, the smoke detector 11a is activated, and the smoke detector 1 is activated.
The smoke detector 11b starts to alarm after a predetermined time delay from the alarm 1a. This smoke detector 11
The alarm delay of the smoke detector 11d for a is dependent on the smoke flow velocity, and generally, when there are no obstacles, the smoke diffusion velocity is Vv = 3 to 5 m/sec in the vertical direction and Vh = 0.5 to 0.5 in the horizontal direction. It is 1m/sec.

Therefore, since the installation distance L between the smoke detectors 11a and 11b is determined in advance, the smoke detector 11b will fire after the smoke detector 11a fires based on the horizontal smoke diffusion speed Vh. It is possible to determine the time it takes for the smoke to report, that is, the arrival time of the smoke between the smoke detectors 11a and 11b.

Of course, it is desirable that the arrival time of smoke between the smoke detectors 11a and 11b be determined as a time range having a certain time width, taking into consideration the conditions of the warning area.

In this way, if the arrival time range of smoke between the smoke detectors 11a and 11b is determined, in the event of a fire, the smoke will definitely arrive within the predetermined arrival time range after the smoke detector 11a is activated. The smoke detector 11b will be activated within the predetermined smoke arrival time range after the smoke detector 11a has activated the alarm.
It is possible to determine whether or not the smoke detector 11b will issue an alarm, and if the smoke detector 11b issues an alarm within the arrival time range, it can be determined that there is a fire. On the other hand, if the smoke detector 11a is activated but the smoke detector 11b is not activated even within the predetermined smoke arrival time range, the alarm is determined to be a non-fire alarm due to a cause other than a fire. be able to.

The setting of the arrival time of smoke to the smoke sensor 11b based on the alarm from the smoke sensor 11a can be similarly determined for the other smoke sensors 11c and 11d. For example, the arrival time range between the smoke detectors 11a and 11c can be determined based on the vertical diffusion velocity Vv of smoke.

In this way, the arrival time range of smoke between the smoke detectors shown in FIG. Based on the identification output, the corresponding setting time is set as a criterion for the counting judgment section 3.

Next, the operation of the embodiment shown in FIG. 1 will be explained with reference to the flowchart shown in FIG.

First, in the steady monitoring state, the determination block 12 monitors whether an alarm signal is obtained via the input interface 2 or not.

Here, taking the security zones A1 to An shown in FIG. 2 as an example, suppose that the smoke detector 11 installed in the security zone A1 is activated and outputs an alarm signal.
Based on the reception of the warning signal from the sensor line 3a, the warning zone A1 is identified in block 13, and at the same time, the warning zone is displayed on the warning display section 4 as shown in block 14. When the alert area that has been alerted in block 13 is identified, the smoke between the alert area A1 preset in the time setting section 5 and another alert area, that is, the adjacent alert area A2 in the case of FIG. In block 15, the arrival time range is read out and set as a reference value, and in block 16, a timer counter provided in the counting/judgment section 3 is started. continue,
In judgment block 17, it is determined whether or not an alarm is triggered when the count value of the timer counter falls within the set time range, and if an alarm is triggered within the set time range, the process proceeds to block 18 and a fire alarm is detected. Then, as shown in block 19, a fire alarm is displayed on the display section 6, and at the same time, the fire extinguishing equipment 8, fire protection equipment 9, and evacuation guidance equipment 10 are controlled in conjunction via the output interface 7.

On the other hand, if there is no alarm in the set time range in the judgment block 17, it is determined that there is no fire, and in the block 20, the timer counter is reset and the output of the reset signal to the input counter interface 2 is performed to the sensor that triggered the alarm. The smoke detector is restored by cutting off the power supply to the line, and the process returns to block 12, the monitoring process.

Furthermore, when a warning is issued for another warning zone at a timing outside the time range set in determination block 17, the first warning zone is restored in block 20, and then the warning is monitored in determination block 12. The same process will now be repeated for the next alert section that occurs outside the set time range due to the first alarm, and for alarms in other warning sections that are outside the set time range, it will be treated as a new fire outbreak. Judgment processing can be executed.

In addition, although the above-mentioned embodiment took as an example the case where the fire extinguishing equipment etc. are controlled in conjunction based on the fire judgment, in addition to this, a pre-alarm is performed when a warning section is first identified, The main warning may be issued based on the fire judgment made by the time setting section 5 and the counting judgment section 3.

Furthermore, although we have described an embodiment in which the alert area is identified by the difference in the sensor line, this example is modified so that the sensors are provided with an address using a common line and the alarm alert area is identified. It goes without saying that inventions can be achieved.

(Effects of the Invention) As described above, according to the present invention, a fire detection device is provided with smoke detectors for each of a plurality of warning sections, and is capable of identifying the warning section of the smoke detector that has triggered an alarm. The arrival time range of smoke between each warning zone at a time is set in advance based on the smoke flow velocity, and when a warning is issued for any warning zone, the time range from the time of this alarm to other warning zones is set in advance. It is determined whether the counted time is within the set time range, and if it is within the set time range, a fire alarm is issued and/or interlocking control of fire extinguishing equipment, smoke prevention equipment, etc. is performed. As a result, it is possible to reliably determine whether or not there is a fire based on the state of smoke diffusion on the receiver side without requiring equipment configurations such as a two-line system or a dual-sensitivity system, increasing the reliability of fire judgments. By improving this, it is possible to combine the interlocking control of fire equipment such as fire extinguishing equipment and smoke prevention equipment.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing one embodiment of the present invention, Figs. 2 and 3 are explanatory diagrams showing an example of guarded sections, and Fig. 4 is an explanatory diagram showing the relationship between smoke arrival times between guarded sections. FIG. 5 is a flowchart showing the fire judgment process according to the present invention. 1: Receiver, 2: Input interface, 3: Count judgment section, 3a to 3n: Sensor line, 4: Alarm display section, 5: Time setting section, 6: Display section, 7: Output interface, 8 : Fire extinguishing equipment, 9: Fire prevention equipment, 1
0: Evacuation guidance equipment, 11, 11a to 11f: Smoke detector.

Claims (1)

[Scope of Claims] 1. A fire determination device in which smoke detectors are provided in each of a plurality of warning compartments, and which identifies the warning compartment of the smoke detector that has triggered an alarm, comprising the following steps: a time setting means for presetting an arrival time range based on the flow velocity of smoke; and a time setting means for counting the time from the time of alarm in a given warning section to the alarm in another warning section, and the counted time is within the set time range. 1. A fire judgment device, comprising: a counting judgment means for judging whether or not the fire alarm and/or a fire interlocking control are performed based on the output of the counting judgment means.