JPS60179075A - Fire judging apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Fields> The present invention monitors the spread of smoke caused by a fire to
- Relating to a fire detection device that makes reliable fire detection without causing false alarms.

(Prior art) Conventionally, in fire alarm systems using smoke detectors, in order to prevent false fire alarms triggered by situations similar to fires caused by smoke detectors and to increase reliability, it is necessary to connect the detector lines in the same alarm area. 2
If a fire alarm is issued on both lines at the same time, it is determined that there is a fire and the fire alarm and disaster prevention equipment are controlled in conjunction. A fire is determined to occur when a high-sensitivity alarm signal is followed by a low-sensitivity alarm signal.

However, with the conventional two-line system, twice the number of detectors is installed in the same area, making equipment construction complicated and costly, and with the Iζ2 sensitivity system, the structure of the smoke detector is complicated. However, there was a problem in that it was necessary to adopt a signal system that could distinguish between high-sensitivity and low-sensitivity alarm signals.

-2- <Object of the invention> The present invention has been made in view of such conventional problems.
Therefore, it is an object of the present invention to provide a highly reliable fire determination device that can reliably determine a fire without changing the structure of smoke detectors installed in warning compartments or increasing the number of detectors.

(Structure of the Invention) In order to achieve this object, the present invention provides a fire detection device that is capable of installing smoke detectors in each of a plurality of warning compartments and identifying the warning compartment of the smoke detector in which an alarm has occurred. The arrival time range of smoke between each warning zone is set in advance based on the smoke flow velocity, and when a warning is issued for any warning zone, the time range for smoke arrival between each warning zone is set in advance. Divide the time until the alarm is raised, judge whether this counted time is within the set time range, and if it is within the set time range, a fire alarm is issued and/or fire extinguishing equipment, smoke prevention equipment, etc. The system is designed to perform interlocking control of the following.

-3= (Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention.

First, the configuration will be explained 4. The fire judgment device of the present invention is installed in a receiver 1 in a central monitoring room, etc. In this reception Ia1, 2 is an input interface, and a smoke detection device installed in each of a plurality of warning zones Sensor lines 3a, 3b, ・
3n is input and connected, and when a smoke detector alarms, short-circuit each of the sensor lines 38 to 3n and a common line (not shown) to low impedance, and issue an alarm to the sensor line. By flowing current, an alarm signal can be sent to the receiver 1. In addition, the input interface 2 has the function of restoring a smoke detector that has once triggered a reset signal to J, and specifically, by temporarily cutting off the power supply to the smoke detector. Smoke detectors that have been activated can be restored. The output of the input interface 2 is given to the counting judgment section 3 and the alarm display section 4, and the counting judgment section 3 calculates the time from the time when a warning is issued for any warning section to the time when the alarm is issued for other warning sections. It has a function of counting and determining whether or not the counted time is within the time set by the time setting section 5. In the time setting section 5, which provides a set time serving as a judgment criterion for 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 the display section 6 to display the judgment result, and is further sent to the fire extinguishing equipment 8 via the output interface 7.
．． It is possible to control fire prevention equipment 9 or evacuation guidance equipment 10, etc.

FIG. 2 shows an example of the installation state of smoke detectors in each security area where the signal line is connected to the input interface 2 of FIG. Detector lines 3a, 3b, . . . 3n are installed for each circle to A2, .

-5- Also, the input interface in FIG. 1]--Smoke detectors are connected to the space 2 by a plurality of smoke detectors 11a installed in the security area ΔO as shown in FIG.

11b, .
This corresponds to the formation of a warning section every 18th to 11th floor,
The size of the warning area 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 a warning section taking the first and second floors of a general building as an example. Smoke detectors 11a and 11b are installed on the first floor, and smoke detectors 11C and 11d are installed on the second floor. .

For example, if a fire breaks out 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. = 6 - First, the smoke detector 11a is activated, and after a predetermined time delay from the activation of the smoke detector 11a, the smoke detector 11b is activated. Smoke detector 11d for this smoke detector 11a
The delay in reporting depends on the velocity of the smoke, and generally speaking, when there are no obstacles, the dispersion velocity of smoke is VV = 3 to 5 m/v in the vertical direction.
sec, horizontally Vh = 0.5-1 m/sec.

Therefore, since the installation part ML between the smoke detectors 11a and 11b is determined in advance, the horizontal smoke diffusion speed vh
After the smoke detector 11a issues an alarm based on
The time until smoke detectors 11a and 11
It is possible to calculate the arrival time of the smoke during b.

Of course, it is desirable that the arrival time of the smoke between the smoke detectors 11a and 11b be determined as a time range having a certain time width, taking into account 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, -7- For example, within the predetermined arrival time range after the smoke detector 11a is activated, The smoke detector 11b will always be activated, and it is determined whether or not the smoke detector 11b will be activated within a predetermined smoke arrival time range after the smoke detector 11a is activated. When the smoke detector 11b is activated within the range, it can be determined that there is a fire. Conversely, even if the smoke detector 11a issues an alarm, the smoke detector 11
If the alarm b. is not received, it can be determined that the alarm is a non-fire alarm caused by a cause other than a fire.

The setting of the arrival time of smoke to the smoke detector 11b based on the alarm of the second smoke detector 11a is the same as that of other smoke detectors 11
A similar determination can be made between c and 11d. For example, the arrival time range of smoke between the smoke detectors 11a and 110 can be determined based on the vertical diffusion velocity Vv of smoke.

In this way, the arrival time range of smoke between each phase of smoke detection -8-n1 shown in FIG. Based on the identification output of the alerted section, the corresponding setting time is set as a criterion for the counting and determining section 3.

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

First, in the steady monitoring state, input interface 2
A block 12 determines whether an alarm signal can be obtained through the
is being monitored.

Here, taking the security zone A1-80 shown in FIG. 2 as an example, if the smoke detector 11 installed in the security zone A1 is activated and outputs an alarm signal, Based on the reception of the alarm signal from line 3a, block 13
1 is identified, and at the same time, as shown in block 14, the alarm section is displayed on the alarm display section 4. When the alarm section that has issued the alarm is identified in block 13, the time setting section 5 is set in advance to identify the alarm section A1 and another alarm section, that is, in the case of FIG. 2, the adjacent alarm section A2. In block 15, the arrival time range of the smoke is read out and set as a reference value, and in block 16, the timer counter set in the counting judgment unit 3 is started.Next, in judgment block 17, the timer counter is When the count value falls within the set time range, it is determined whether there is an alarm or not, and if there is an alarm within the set time range, the process proceeds to block 1B, where it is determined that there is a fire, and the process proceeds to block 19. As shown, a fire alarm is displayed on the display unit 6, and at the same time, the fire extinguishing equipment 8 is displayed via the output interface.
Fire prevention equipment9. The evacuation guidance equipment 10 is controlled in conjunction.

On the other hand, if there is no alarm within the set time in the judgment block 17, it is determined that there is no fire, and the timer counter is reset in block 20, and a reset signal is output to the input interface 2 to detect the alarm. The next smoke detector is restored by cutting off the power supply to the detector line -10- and the process returns to the monitoring process of block 12 again.

Furthermore, when an alarm is issued in another warning section at a timing outside the time range set in the determination block 17, the first alarm section is incremented by 19 in block 20, and then the alarm is monitored in the determination block 12. , the same process will be repeated for the next area where a fire is triggered outside the set time range due to the first alarm, and alarms in other alert areas that are outside the set time range will be treated as a new fire outbreak. Fire judgment processing can be executed.

In addition, although the above-mentioned embodiment took as an example the case where fire extinguishing equipment etc. are controlled in conjunction based on fire judgment, in addition to this, a pre-alarm is performed when a warning section alarm 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, the identification of the guard area is based on the difference in the sensor line = 11
- Although the embodiment has been described in which the sensor is identified using a common line, it goes without saying that the present invention can be achieved by changing the method to J: which uses a common line to provide an address to the sensor and identifies the warning area.

(Effects of the Invention) - As explained above, according to the present invention, smoke detectors are installed in each of a plurality of warning sections, and the warning section of the smoke detector in which the alarm was issued is identified, and a fire that occurs by 1% is detected. In the determination device, the arrival time range of smoke between each warning zone in the event of a fire is set in advance based on the smoke flow velocity, and when a warning is issued for any warning zone, the time range for smoke arrival between each warning zone is set in advance. Count the time to the warning area, judge whether this divided time is within the set time range, and if it is within the set time range, a fire alarm is issued and/or fire extinguishing equipment, smoke prevention equipment, etc. Because interlocking control was implemented (2), there was no need for equipment configurations such as a 2-line system or a 2-sensitivity system, and it was determined whether there was a fire or not based on the state of smoke dispersion at the receiver side. By improving the reliability of fire judgment, fire prevention equipment such as fire extinguishing equipment and smoke prevention equipment, etc.
It is possible to perform interlocking control of equipped equipment.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
FIG. 3 is an explanatory diagram showing an example of warning zones, FIG. 4 is an explanatory diagram showing the relationship of arrival time of smoke between warning zones, and FIG. 5 is a flowchart showing fire judgment processing according to the present invention. It is. 1: Receiver 2: Input interface 3: Count judgment section 38 to 30: Detector line 4: Alarm display section 5: Time setting section 6: Display section 7: Output interface 13-8: Fire extinguishing equipment 9: Fire prevention equipment 10: Floating induction equipment 11.11a ~ Ilf: Smoke detector patent applicant Hochiki Co., Ltd. agent Patent attorney Susumu Takeuchi-14-

Claims (1)

[Scope of Claims] 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 in which an alarm has been issued, comprising the following steps: smoke reaching between the warning compartments in the event of a fire. A time setting means for presetting a time range based on the smoke flow velocity, and a time setting means for determining the time from the time of alarm in a given warning section to the alarm in another warning section, and counting the counted time within the set time range. 1. A fire determination device, comprising: a counting judgment means for judging whether or not a fire alarm and/or a fire interlocking control are performed based on the output of said counting judgment means.