JPS63136193A - Fire alarm - 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 The present invention relates to a fire alarm system, and particularly when monitoring a place with a free space that is relatively undivided by walls, such as a department store, the direction and speed of the spread of a fire phenomenon can be accurately detected. [Prior Art] Related to a Fire Alarm Device that Can Detect Fire Alarms [Prior Art] Conventionally, an evacuation guidance device has been proposed that uses an indicator to indicate a safe evacuation route or evacuation direction based on information detected by a fire detector. In such an evacuation guidance device, the evacuation direction is determined by identifying a dangerous area and a safe area where no fire has occurred from detection information from a fire sensor, and indicates the evacuation direction using an indicator.

[Problems to be solved by the invention] When the target for evacuation guidance is a monitored area such as Dever 1~ which has a relatively wide free space that is not divided by walls etc., detection from a conventional fire alarm system is difficult. It is difficult to give accurate evacuation guidance instructions in the early stages of a fire based on information. This is because conventional devices only provide a binary signal indicating whether there is a fire or not, so in the early stages of a fire, only information about the location of the fire can be obtained. It was extremely difficult to predict the situation and issue evacuation guidance instructions.

[Means for Solving the Problem] The fire V-alarm device of the present invention is capable of accurately displaying fire alarms and issuing evacuation guidance instructions from phenomena in the early stages of fire occurrence, and is suitable for use in department stores that do not have partition walls, etc. Alternatively, multiple sensors are installed in a distributed manner in a monitoring area with free space that is relatively unaffected, and information at the time of detection based on detection signals from multiple sensors adjacent to each other and sensor position information stored in advance can be obtained. This fire alarm device calculates the spreading direction and speed of smoke, heat, gas, etc. detected by a sensor, and can drive a display device or an evacuation guidance device based on the calculation results.

[Embodiments] Hereinafter, embodiments of the fire alarm system of the present invention will be shown and described based on the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

The fire alarm system of the present invention includes a plurality of sensors S1 to Sn installed in each monitored area, and a central monitoring and control device that processes the detection signals of the sensors S1 to Sn and performs fire alarm display or evacuation guidance control. It is composed of 3.

The central monitoring and control device 3 includes an interface 1 that receives detection signals from the sensors S1 to Sn via signal lines, and an interface 1 that receives detection signals from the sensors S1 to Sn based on the detection information from the interface 1.
It is composed of a processing unit 2 that calculates the spreading direction and speed of smoke, heat, gas, etc. detected by n, and drives a display device, a yB difficult guidance device, etc. based on the calculation results.

When the operation of the fire alarm system configured in this way is determined, each sensor S1 to Sn detects smoke, heat, gas, etc. of a fire phenomenon, and when this detection level exceeds a certain level, an operation signal or An analog signal indicating the magnitude of the phenomenon is output to the signal line. Interface 1 of central monitoring and control device 3
receives the detection signals from the sensors S1 to Sn and outputs them to the processing unit 2. The arithmetic processing unit 2 has sensors S1 to
Based on the detection signal of Sr+, the spread direction and velocity of smoke, heat, gas, etc. detected by the sensors S1 to Sn are calculated. Then, a control signal is output based on the calculation result to drive a display device or an evacuation guidance device (not shown), etc. 6 Next, based on the detection signals of the sensors S1 to Sn, smoke 1 heat,
The method by which the processing unit 2 calculates the spreading direction and velocity of gas etc. will be explained based on the explanatory diagrams shown in FIGS. 2 and 3.

FIG. 2 is a plan view showing the mounting positions of the sensors S1 to S3. To simplify the explanation, the line segments connecting the sensors S1 to S3 are arranged to form an equilateral triangle.

For example, suppose that smoke spreads in the direction of the arrow of line segment XX'. Sensors Sl, S2 . S
3, Pl, , P2 . P3, sensor S1
If the center of the circle passing through ~S3 is O, then the center 0 and the sensor S
Let the angle θ between the line segment passing through 1 and the line segment XX' be α, the angle between the sensor S1 and the sensor S2 viewed from the center 0 be α, and the angle between the sensor S1 and the sensor S3 be β. Angle α
, β are α=120° and β=240° since the sensors S1 to S3 are arranged in an equilateral triangle. Then, as shown in FIG. 3, the outputs of sensors S1 to S3 reach a predetermined level (
tl, t2. Let it be t3. Intersection point Pi from center O, P2. The distance of P3 is when the radius of the circle is r.

P1=rcos θ P2=rcos (θ−α) P3=rcos (θ−β). Now, if the velocity of smoke is V, the following relational expression holds true.

rcosθ−rcos (θ−α) =V(t2-tl)...(1) rcosθ−rcos (θ−β) =v(t3-tl)...(2) The above equations (1), (2> and α=120''.

β=240'', θ=j an −' Z −<3
)Z =-/T (t3-t2)/'(t,
2 + t 3-2 t 1 )...(4) Also, v-(sin θ) f r / (t 3-t 2 )
...(5) Time tl, t2 . of equation (4). t3 is sensor Sl.

S2. Since it can be known from the detection signal of S3, Z can be obtained, and the angle θ can be calculated from equation (3). In other words, it is possible to know the direction in which the smoke is traveling. Furthermore, if the angle θ can be calculated, the speed at which the smoke travels can be calculated from equation (5). The positional relationship of the sensors S1 to S3 stored in advance in this way and the times tl, t2.t3 when the outputs of the sensors S1 to S3 exceeded a predetermined level (smoke density)
Phenomena detected by sensors S1 to S3 (smoke, heat, gas)
It is possible to calculate and know the direction and speed of the spread.

Sensor S1. S2. It seems that the calculation accuracy will improve if the S3 is installed at a wider interval, but the assumption that the phenomenon (smoke) is uniform (that it moves without a diffusion effect) is broken and the detection time is ambiguous. , which in turn increases the error. The mounting positions of the sensors S1 to S3 do not have to be on concentric circles (equilateral triangles), and may be determined from the detection signals of four or more sensors in order to improve detection accuracy.

In this case, the calculation is a little more complicated, but it can be obtained using the same calculation method.

[Effects of the Invention] As explained above, the fire alarm device of the present invention can calculate and determine the spreading direction and speed of a fire phenomenon (smoke, heat, gas, etc.) based on detection signals from a plurality of sensors. . Based on this calculation result, the fire alarm display and evacuation guidance device can be driven, so that appropriate warning display and evacuation guidance can be performed in accordance with the fire situation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the fire alarm device of the present invention, and FIGS. 2 and 3 are explanatory diagrams explaining the operation of the device shown in FIG. S1-Sn...Sensor, 1...Interface. 2... Arithmetic processing unit, 3... Central monitoring and control unit.

Claims (1)

[Claims] In a fire alarm system that performs fire monitoring based on detection signals of a plurality of sensors distributed in a monitoring area without a partition wall or having a free space where the influence of partition walls is relatively small, a plurality of the above-mentioned sensors adjacent to each other are The spread direction and speed of smoke, heat, gas, etc. detected by the sensor are calculated from the information from the sensor when a fire phenomenon is detected and the position information of the sensor that is stored in advance, and the display device or evacuation guidance is calculated based on the calculation result. A fire alarm device characterized by comprising an arithmetic processing unit that drives the device, etc.