JPS6221023A - Flame detector - Google Patents

Abstract

PURPOSE:To detect the size of a flame quickly and accurately, by identifying the size of the flame on the base of the rising output among detection outputs at a detector section. CONSTITUTION:When a signal from a flame detector 9 is inputted through an input interface 15, a control section 17 controls vertical way control means 3b and 4b, horizontal way control means 3c and 4c and a direction control means 6 on a control program through an output interface 16 so that the fire searching zone already equally divided in two will be further set for division to give an order of searching the source of the fire. The control section 17 also incorporates a identifying section 19 which identifies the size of a flame based on the rising output in the information from detector sections 3a and 4a adapted to detect the flame. When any one of flame searchers detect a flame, the identifying section 19 drives the vertical way control means of the other flame searcher to control the deviation angle in the vertical way of the corresponding detector section to the same angle as the other detector section which detected the flame and the horizontal-way scanning by the one pair of detector sections 3a and 4a is performed normally and reversely in sequence to decide on the position of one end and the other end of the flame.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a flame detection device that accurately and quickly detects the size of a flame generated within a monitoring area.

(Prior Art) When the inventors of the present application detect that a fire has broken out in a monitoring area, they drive a pair of flame search devices, and determine the size of the flame according to the calculation result based on the search information from the flame search devices. proposed an automatic fire extinguishing system that determines the size of the flame and, if the flame is larger than a predetermined size, directs the nozzle to the position of the flame and discharges extinguishing liquid to extinguish the flame (Japanese Patent Application No. 58-249141). issue).

In this automatic fire extinguishing system, each of the pair of flame search devices includes a detector using a pyroelectric sensor that sends out a differential output corresponding to the intensity of infrared rays, which corresponds to the thermal energy radiated from the flame, and The detector was equipped with horizontal control means for horizontally scanning the detector and vertical control means for vertically controlling the detector.

To explain the flame searching operation of a flame searching device used in a conventional automatic fire extinguishing system, first, while maintaining the vertical deviation angle of the detector at a predetermined angle, the horizontal direction control means is driven to horizontally move the detector. was scanning in the direction. If no flame is detected in the above search operation, drive the vertical direction control means to set the vertical deflection angle of the detector to a predetermined angle, and then drive the horizontal direction control means to move the detector horizontally. The fire source was searched for by scanning in the same direction, and the same search operation was repeated to detect the location of the fire source. That is, the vertical deviation angle of a pair of detectors is deviated by a predetermined angle based on a preset deviation angle setting program, and the pair of detectors is deviated horizontally for each set deviation angle. When the vertical deviation angle reached the fire source position, the fire source was detected by horizontal scanning.

Such an automatic fire extinguishing system is required to quickly and accurately detect the position and width of a flame in order to automatically extinguish a flame that occurs within a monitored area.

For this reason, it has been proposed to increase the horizontal scanning speed of the pair of detectors in the horizontal direction to shorten the search time required to search for flames in the entire monitoring area.

(Problems to be Solved by the Invention) However, since a pyroelectric sensor that sends out a differential output corresponding to the intensity of thermal energy radiated from the flame, that is, infrared rays, was used as a flame detector, the following There were problems like.

Fig. 4A is a diagram of the output waveform from the detector when the horizontal scanning speed is set to the normal scanning speed, and Fig. 4B is a diagram of the output waveform from the detector when the horizontal scanning speed is set to the normal scanning speed.
FIG. 4 is an output waveform diagram from the detector when the horizontal scanning speed is increased compared to FIG. A; FIG.

When the horizontal direction control means of the detector is driven to scan in the forward direction as shown in FIG. The position of the flame F is defined as one end X of the flame F, and when the detector is scanned in the forward direction, a negative peak occurs when the flame is removed from the viewing angle of the detector, and the position where the peak value is less than a predetermined value -F is defined as the flame. Other end of F
The width between the positions X and Y was determined to be the width of the flame F.

However, if the horizontal scanning speed of the detector is set fast as shown in Figure 4B, at the time the detector captures the flame F, the incident energy that enters the detector per unit time changes. On the other hand, because the amount increases, a large positive peak occurs, but because the scanning speed is fast, even at the time when the flame F is out of the field of view of the detector, the output of the detector does not completely return to the base, and there is a certain From this level state, a negative peak occurs due to the flame F being out of the viewing angle of the detector. Therefore, the position Z where the negative peak value is less than the predetermined value -E is determined to be the other end of the flame F, and even though the width of the flame F is between X and Y,
There was a problem in that the width between -7 was incorrectly judged to be the width of flame F.

(Means for Solving the Problems) The present invention has been made in view of the above problems, and provides a flame position detection device that quickly and accurately detects the size of a flame by setting a fast scanning speed. Therefore, the detection unit, which sends out a differential output corresponding to the thermal energy radiated from the flame, is scanned in the horizontal and vertical directions according to commands from the scanning unit, and the detection unit is detected by scanning the scanning unit in the forward and reverse directions. The output is input to the determining section, and the size of the flame is determined based on the rising output among the detection outputs of the detecting section.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, and FIG. 2 is a block diagram of FIG. 1.

First, to explain the configuration, 1 is an automatic fire extinguishing device, and a pair of flame search devices 3 and 4 are disposed on a pedestal 2 at a predetermined interval. One flame search device 3 includes a detection section 3a that detects a fire source, a vertical direction control means 3b that controls the detection section 3a in the vertical direction, and a horizontal direction control section 3C that controls the detection section 3a in the horizontal direction. There is. Similarly, the other flame search device 4 includes a detection section 4a for detecting a fire source, a vertical control means 4b for vertically controlling the detection section 4a, and a control means 5b for controlling the nozzle 5a according to the distance to the fire source. It is equipped with a radiation state control means 5C that controls the radiation state by adjusting the opening degree of the injection port. Reference numeral 6 denotes a direction control means, which controls the rotation of the pedestal 2 in the horizontal direction so that the flame search devices 3, 4 and the nozzle device 5 are integrally opposed to each other in the direction of the fire source. 7 is a buzzer, 8 is a lamp, and 9 is a fire detector for overall monitoring. When the fire detector 9 detects a fire occurring within the monitoring area, it sends detection information to the circuit section 10. That is, detection information from the fire detector 9 is sent to the control section 17 via the input interface 15. When the control unit 17 receives the signal from the fire detector 9, it outputs the vertical direction control means 3b, 4b, the horizontal direction control means 3c,
4c and the direction control means 6. The control unit 17 has a built-in microcomputer, and includes a deviation angle setting program for setting vertical and horizontal deviation angles during flame search, a calculation program for calculating the fire source position based on the principle of triangulation, etc. The vertical control means 3b, 4b, the horizontal control means 3C, 4C, and the direction control means 6 are controlled based on a preset control program to divide the fire search area into two equal parts. The flame search device is further divided into units of 3.4 and commanded to search for the fire source.

Further, the control section 17 has a built-in discriminating section 19 that discriminates the size of the flame based on the rising output of the detection information from the detecting sections 3a and 4a that detected the flame.

That is, as shown in FIG. 4, when one of the flame search devices detects the flame F, the vertical direction control means of the other flame search device is driven by a command from the control unit 17, and the corresponding detection is performed. One end of the flame F is detected by controlling the vertical deviation angle of the flame F to be the same angle as that of one of the detectors detecting the flame, and scanning the horizontal direction of the pair of detectors 3a and 4a in the forward and reverse directions, respectively. The respective positions of X and the other end Y of the flame F are determined. 18
An alarm section is activated based on a command from the control section 17 to drive the buzzer 7 and lamp 8 to warn of a fire.

1] is a tank for storing a fire extinguishing liquid such as a fire extinguisher or fire extinguishing water; 12 is a pump that sends the fire extinguishing liquid from the tank 11h1 to the nozzle 5a; 13 is a motor; When activated based on a command from the control unit 17, the fire extinguishing pump 12 is driven, and extinguishing liquid is supplied to the nozzle 5a to start fire extinguishing activities.

3A and 3B are flowcharts showing control operations of the control section 17.

Hereinafter, the operation of the present invention will be explained with reference to FIGS. 3A and 3B.

In the third recess, the initial state in the normal state of block 2'1 is set to g2. For example, the horizontal direction control means 3
C, 4C and also controls the direction control means 6 to adjust the rotation angle of the pedestal 2,
a are directed toward the front. In addition, the vertical direction control means 3b and 4b are controlled to, for example, change the vertical deviation angle of the detection part 3.a directly downward, or change the vertical deviation angle of the detection part 4a towards the approximate center of the monitoring area. Set to . In the block 22, the fire detector 9 for overall monitoring divides the monitoring area into area No. 1 and area No. 2, and monitors the occurrence of fire in each area. For example, monitoring area N
Assuming that a fire occurs in area No. 1, the fire detector 9 detects the flame occurring in area No. 1, and the process proceeds from block 22 to block 23.

In blocks 2 and 3, the direction control means 6 is driven to rotate the pedestal 2 in the horizontal direction, so that the detection units 3a, 4a and the nozzle 5a are integrally opposed to each other in the direction of the area N001. block 24
Then, the detection units 3a and 4a are instructed to perform a flame search operation. That is, the vertical deviation angle is initially set to be directly downward for the detecting section 3a and approximately toward the center for the detecting section 4a, and in this state, the horizontal direction control means 3C and 4C are driven to set the corresponding detecting section 3a. , 4a are kept at their initial values, and the area N0.1 is sequentially scanned in the horizontal direction. In block 25, it is determined whether or not the detection section 3a has detected a flame. If no flame is detected, the process proceeds to block 26, where the detection information from the detection section 4a is decoded. block 26
If the flame detection information is not obtained even in 1q, the process proceeds to block 27, and the vertical direction control means 3b and 4b are driven to bias the vertical directivity angles of the corresponding detection sections 3a and 4a upward by a predetermined angle, respectively. Set the position. Further, the process proceeds to block 24, in which the horizontal direction control means 3c and 4c are driven to maintain the vertical deviation angles of the corresponding detection units 3a and 4a at the respective deviation angles set in block 27, while controlling the area. No. 1 is scanned in the horizontal direction.

Thereafter, similarly, the vertical deviation angle of each detection unit 3a and 4a is set upward by a predetermined angle stepwise based on a preset deviation angle setting program, and each deviation angle is adjusted to The flame search operation is repeated by horizontally scanning the area No. 1 with the detection units 3a and 4a while maintaining the flame position.

Here, the flame search operations of the detectors 3a and 4a proceed, and if the detector 3a detects a flame first, the process advances from block 25 to block 2. In block 29, the vertical direction control means 4b is driven to control the vertical deviation angle of the detection section 4a to be the same angle as that of the detection section 3a. In block 30, the direction control means 6 is driven to control the rotation of the pedestal 2, so that the flame search device 3.4 and the nozzle device 5 are integrally opposed to each other in the direction of the flame. Further, the process proceeds from ``■'' in FIG. 3A to block 31 via ``■'' in FIG.
Scan a in the forward direction. In block 32, the position of one end X of the flame F is detected as the detection units 3a and 4a scan in the forward direction. That is, when the detection parts 3a and 4a are scanned in the forward direction from the left side to the right side as shown in FIG. As the amount of change in incident energy increases,
Generates a large positive peak. The position where this peak value exceeds the set clay E is determined as one end X of the flame F. The process then proceeds to block 33, in which only the horizontal control means 3C and 4C are driven to scan the corresponding detection units 3a and 4a in the opposite direction without changing the vertical deviation angles of the detection units 3a and 4a. do. In block 34, the detection unit 3a
As 4a scans in the opposite direction, the other end Y of the flame F is detected. That is, as shown in FIG. 4B, the detection units 3a and 4
When the horizontal direction of a is scanned in the opposite direction from the right side to the left side, the amount of change in incident energy from the flame F per unit time when each of the detection units 3a and 4a captures the flame F As the value increases, a large positive peak occurs. The position where this plus peak value exceeds the set clay F is determined as the other end Y of the flame F. In block 35, flame F
After determining one end X and the other end Y, the size of the flame F is calculated by setting the width between the positions X and Y as the width of the flame. In block 36, it is determined whether the calculated size of the flame F is greater than or equal to a predetermined size, and if it is less than the predetermined size, then from Return to block 21 via (■), make initial settings, and continue monitoring the fire. If the size of the flame is larger than a predetermined size in block 36, the process proceeds to block 37, where the buzzer 7 and lamp 8 are activated to issue a fire alarm. Furthermore, in block 38, the exact position of the flame, that is, the distance to the flame F, is calculated by triangulation based on the detection information from the detection units 3a and 4a.

The nozzle device 5 is controlled based on this calculation result.

That is, in block 39, the radiation direction control means 5b is driven to adjust the vertical directivity angle of the nozzle 5a to direct the injection port in the direction of the flame F. Further, in block 40, the radiation state control means 5C is driven to adjust the opening degree of the injection port of the nozzle 5a, thereby controlling the discharge state in which the extinguishing liquid is discharged. In block 41, the motor 13 is activated to drive the fire extinguishing pump 12, to discharge extinguishing liquid from the nozzle 5a, and to start fire extinguishing activities.

The block 42 monitors whether the fire has been extinguished based on the detection information from the fire detector 9 for overall monitoring, and if the fire is not completely extinguished, the process returns to the block 38 and the detectors 3a and 4a are detected again. The position of the fire source is calculated by collecting the detection information, and based on the calculation result, the radiation direction and radiation state of the nozzle 5a are readjusted to continue firefighting. When it is confirmed in block 42 that the fire has been completely extinguished, the process proceeds to block 43, where the motor 13 and fire pump 12 are turned off to stop fire extinguishing activities.

In block 44, the buzzer 7 and lamp 8 are turned off to stop the alarm, and the process returns to block 21 via ■ in FIG. 3B to ■ in FIG. Set to the initial state and perform fire monitoring.

In the above embodiment, a pyroelectric sensor is used as the flame sensor of the detection units 3a and 4a, but an appropriate flame that sends out a differential output corresponding to the intensity of thermal energy radiated from the flame is used. It may also be configured using a sensor.

Further, in this embodiment, the width of the flame is measured on the side of the body, but the height of the flame may be measured. However, when measuring the height, after scanning the monitoring area in the vertical direction, the detection unit is driven in the horizontal direction by the deflection angle, and the detection unit is scanned in the vertical direction. Similar to the width, the λ1 measurement of the height can be realized by driving the detector in the forward and reverse directions.

Furthermore, although the above embodiment has been described using a pair of flame search devices that search for flames by scanning the detection section in the horizontal and vertical directions, the present invention may be configured with - number of flame search devices. Specifically, if the X point of the flame is detected by the rising output from the detection part during scanning in the forward direction, the X point of the flame is detected by the command from the control part in the reverse direction and the rising output from the detection part is detected. The cost can be reduced by detecting the end, that is, point Y, and calculating the size of the flame based on the positional information of point X and point Y.

(Effects of the Invention) As described above, according to the present invention, the detection unit that sends out a differential output corresponding to the thermal energy radiated from the flame is scanned in the horizontal and vertical directions by a command from the scanning unit. The detection output of the detection unit obtained by scanning the scanning unit in the forward and reverse directions is input to the determination unit, and the magnitude of the flame is determined based on the rising output of the detection output from the detection unit. So, even if the scanning speed of the detection unit is set fast,
The position of the flame can be detected accurately. In addition, by setting the scanning speed quickly, the position and width of the flame can be quickly adjusted.
Moreover, the effect of being able to perform accurate detection can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram showing an embodiment of the present invention, Fig. 2 is a block diagram of Fig. 1, Fig. 3 A and B are flowcharts showing control operations, and Fig. 4 A and B are detection FIG. 4 is an output waveform diagram when the unit detects a flame. 1: Automatic fire extinguishing device 2: Frame 3.4: Flame search device 3a, 4a: Detection units 3b, 4b: Vertical direction control means 3c, 4c: Horizontal direction control means 5: Nozzle device 5a: Nozzle 5b: Radial direction control means 5C: Radiation state control means 6: Direction control means 7: Buzzer 8: Lamp 9: Fire detector 10: Circuit section 11: Tank 12: Fire pump 13: Motor 15: Input interface 16: Output interface 17: Control section 18: Alarm section 19: Discrimination section

Claims (1)

[Claims] A detection section that sends out a differential output corresponding to thermal energy radiated from the flame, a scanning section that scans the detection section in horizontal and vertical directions, and a control section that drives the scanning section in forward and reverse directions. and a determination unit that determines the size of the flame based on the rising output from the detection unit by scanning in the forward and reverse directions of the scanning unit.