JP6139873B2 - Heat detector and fire alarm system equipped with the heat detector - Google Patents

Description

  The present invention relates to a heat sensor that detects heat from a fire, and more particularly to a spot-type heat sensor that can specify the direction of a fire source. The present invention also relates to a fire alarm facility provided with the heat detector.

  Conventionally, in a heat detector, heat due to a fire is detected by a heat detection element such as a thermistor. The heat detector at the time of fire hits the heat detection element and the resistance value of the heat detection element changes, whereby the heat detector can detect the heat due to the fire.

  In particular, since the heat detector must quickly detect heat due to a fire even in a low temperature state, the heat detection element is provided so as to protrude from the surface of the cover of the heat detector (for example, Patent Document 1).

JP 2011-113378 A

  However, although the conventional heat detector can identify the occurrence of a fire by the heat of a hot air flow generated from a fire, there is a problem that it does not reach the direction of the fire source.

  The present invention has been made in view of such conventional problems, and in addition to the function as a conventional heat detector for detecting heat by detecting heat, the direction of the fire source can be specified with high accuracy. An object is to provide a thermal sensor.

The present invention relates to a heat sensor comprising a cover and a heat detection element provided on the cover, wherein a plurality of heat detection elements are provided on the same circumference centering on the center of the cover , and each heat detection element The direction of the fire source is specified by the signal output from.

Further, the present invention provides a heat detector comprising a cover and a heat detection element provided on the cover , the cover having partition walls arranged radially from the center portion toward the outer peripheral portion, The detection element is located at a position away from the center of the cover and is provided one by one between the partition walls, and the direction of the fire source is specified by a signal output from each heat detection element. vessel.

  In the present invention, since the heat detection element is provided in the section partitioned by the partition wall, the heat detection element closer to the fire source can detect a higher temperature, and thus the direction of the fire source can be specified.

It is the example of the block diagram of the heat sensor which concerns on this invention, and is the figure seen from the cover side. It is an example of the block diagram of the heat sensor and fire receiver which concern on this invention. It is Example 1 of the calculation which specifies the direction of the fire source of the heat sensor which concerns on this invention. It is Example 2 of the calculation which specifies the direction of the fire source of the heat sensor which concerns on this invention. It is another example of the block diagram of the heat sensor which concerns on this invention. It is an example of the block diagram of the heat detection element used in FIG.

Hereinafter, a heat sensor 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
[Configuration of Heat Sensor 10]
The heat sensor 10 includes a base (not shown) and a main body cover (hereinafter referred to as a cover 1), and the cover 1 is attached to a base fixed to the ceiling surface.

  Reference numeral 3 denotes a partition wall, which is provided on the cover 1 in a radial manner from the center to the outer periphery. As shown in FIG. 1, the partition wall 3 is in contact with the adjacent partition wall 3 at a right angle, and has four partition walls 3. That is, the angle between adjacent partition walls 3 is 90 degrees, the opposing partition walls 3 are located on the same straight line, and the cover 1 is divided into four sections. Moreover, the height of the partition wall 3 is higher than the height of the heat detection element 5 described later.

  Reference numeral 5 denotes a heat detection element, which comprises a thermistor, measures the ambient temperature based on a change in electric resistance, and outputs it to the control circuit 12 described later. One heat detection element 5 is provided in each of the sections separated from the center of the cover 1 and partitioned by the partition wall 3. The plurality of heat detection elements 5 provided in the cover 1 are provided on the same circumference with the center portion of the cover 1 as the center. That is, the heat detection element 5 is separated from the center of the cover 1 by the same distance. The heat detection element 5 includes four heat detection elements 5a, 5b, 5c, and 5d. The heat detection elements 5a are provided at point-symmetrical positions so as to face 5b and 5c.

  The control circuit 12 of the heat sensor 10 is connected to the heat detection elements 5a, 5b, 5c, and 5d, and is also connected to the control circuit 21 of the fire receiver 20. The control circuit 12 receives an output value corresponding to the ambient temperature from each heat detection element 5. Thereafter, the control circuit 12 discriminates the ambient temperature based on the output value of the heat detection element 5 and outputs a coded signal or the like to the control circuit 21 of the fire receiver 20.

With reference to FIG.2 and FIG.3, the structure of the fire receiver 20 to which the heat sensor 1 of this invention is connected is demonstrated.
[Configuration of Fire Receiver 20]
21 is a control circuit of the fire receiver 20 and is connected to the control circuit 12 of the heat detector. The control circuit 21 receives information on the ambient temperature of each heat detection element 5 output from the control circuit 12, and performs a determination of fire and an operation for specifying the direction of the fire source 30. Then, the control circuit 21 outputs the position information of the fire source 30 obtained by the arithmetic processing to the display device 23.

  Reference numeral 23 denotes a display device, which includes a monitor such as a liquid crystal screen, and displays the position of the fire source 30 when receiving the position information of the fire source 30 output from the control circuit 21.

With reference to FIG. 1 thru | or FIG. 3, the example of the calculation which specifies the direction of the fire source 30 by the control circuit 21 is demonstrated.
[Calculation method 1 for identifying the direction of the fire source 30]
The heat detection elements 5a to 5d are respectively located in sections partitioned by the partition wall 3 of the cover 1, and the height of the partition wall 3 is higher than the height of the heat detection elements 5a to 5d. Therefore, when the hot air flow generated from the fire source 30 travels down the ceiling and hits the heat sensor 10, the heat detection of the section surrounded by the partition wall 3 in the direction of the hot air flow (direction of the fire source 30). The temperature around the element 5 is highest. More specifically, when the direction of the opening (part of the outer edge of the thermal sensor 10) surrounded by the partition wall 3 is the direction of the hot air current, the temperature around the heat detection element 5 in that section Is the highest. Hereinafter, the direction of the opening of the section surrounded by the partition wall 3 is defined as the direction of the heat detection element 5 provided in the section.

  On the other hand, the sections facing directions other than the direction of the hot air flow prevent the hot air flow from hitting the heat detection elements 5 in the respective partitions by the partition wall 3, and therefore the temperature around the heat detection elements 5 in those sections is It becomes difficult to rise.

  That is, the heat detection element 5 located closer to the fire source 30 has a higher ambient temperature and outputs a larger output value. On the other hand, the heat detection element 5 located farther from the fire source 30 has a lower ambient temperature and outputs a smaller output value.

  When receiving the information signal (output value) of the ambient temperature of the heat detection elements 5a to 5d, the control circuit 21 calculates and obtains the temperature difference between the heat detection elements 5 facing each other. As shown in FIG. 1, when the heat detection elements 5a and 5b and 5c and 5d are provided to face each other, the temperature difference between the heat detection elements 5a and 5b and the temperature difference between the heat detection elements 5c and 5d are as follows. Ask.

  Then, the control circuit 21 converts the temperature difference history into a vector value having both the numerical value of the temperature difference and the direction of the heat detection element 5 that detected the high temperature, and the heat detection elements 5a and 5b. Synthesis is performed in an orthogonal coordinate system in which the straight line connecting the directions is the X axis and the straight line connecting the directions of the heat detection elements 5c and 5d is the Y axis. Specifically, the direction information of the heat detection element 5 that has detected a high temperature is a negative value on the X-axis if the value of the heat detection element 5a is larger than the value of 5b, and the value of the heat detection element 5b is If the value is larger than 5a, the value is positive on the X-axis, if the value of the heat detection element 5c is larger than the value of 5d, the value is negative on the Y-axis, and if the value of the heat detection element 5d is larger than the value of 5c. This is a positive value on the Y axis.

  Based on FIG.1 and FIG.3, the identification method of the direction of the fire source 30 by the control circuit 21 when a fire breaks out is demonstrated using a concrete value.

  FIG. 3A shows a case where the fire source 30 is generated in a direction around the middle between the heat detection elements 5b and 5d. In this case, output values are output from the heat detection elements 5 a to 5 d to the control circuit 21. Here, the output value of the heat detection element 5 will be described in a simplified manner. The output value of the heat detection element 5a is 1, the output value of the heat detection element 5b is 9, the output value of the heat detection element 5c is 2, The output value of the detection element 5d is 6.

  First, the control circuit 21 obtains the difference between the output values of the heat detection elements 5a and 5b and the heat detection elements 5c and 5d to be converted into a vector value having direction information. In the example of FIG. 3A, when the difference between the output values is obtained, the value of the heat detection element 5b is larger than the value of 5a, so that the value of the heat detection element 5d is larger than the value of 5c. The axial direction is +4. In the Cartesian coordinate system composed of the X-axis and the Y-axis, the difference between the heat detection elements 5b and 5a is (X, Y) = (8, 0), which is represented by the arrow A, and the difference between the heat detection elements 5d and 5c is (X, Y) = (0, 4), which is represented by an arrow B. When these vector values (arrows A and B) are combined, (X, Y) = (8, 4) is obtained, which is represented by an arrow C. The arrow C forms an angle of about 26.6 degrees with the direction of the heat detection element 5b (the direction of the arrow B), and the direction of the arrow C indicates the direction of the fire source.

  That is, in the case of the above example, the fire source 30 is in the middle direction between the heat detection elements 5b and 5d, and more specifically, the straight line connecting the center of the cover 1 and the heat detection element 5b and the center of the cover 1 The fire source 30 is located at a position where the angle formed by the straight line connecting the fire source 30 and the fire source 30 is approximately 26.6 degrees. That is, the direction of the fire source can be determined by the angle formed by the arrow C calculated by the control circuit 21 and the X axis or the Y axis.

In the above, the method of obtaining the difference between the paired heat detection elements 5 and converting it to a vector value and combining the value to specify the direction of the fire source 30 has been shown. It is also possible to specify the direction of the fire source 30 by converting the output value of the detection element 5 into a vector value and combining all the values. A method for specifying the direction of the fire source 30 will be described below with reference to FIGS. 1 and 6.
[Calculation method 2 for identifying the direction of the fire source 30]
When the control circuit 21 receives the information (output value) of the ambient temperature of the heat detection elements 5a to 5d, the control circuit 21 converts the output value into a vector value according to the direction of each of the heat detection elements 5a to 5d, and converts those vector values. Perform composite operation. More specifically, as shown in FIG. 1, when the heat detection elements 5a and 5b and 5c and 5d are provided to face each other, a straight line connecting the directions of the heat detection elements 5a and 5b is represented by the X axis. In an orthogonal coordinate system having a straight line connecting the directions of the elements 5c and 5d as the Y axis, the output value of each heat detection element 5 can be calculated as a vector value. Specifically, the value of the heat detection element 5a is a negative value on the X axis, the value of the heat detection element 5b is a positive value on the X axis, and the value of the heat detection element 5c is a negative value on the Y axis. The value of the heat detection element 5d is a positive value on the Y axis.

  A method of specifying the direction of the fire source 30 by the control circuit 21 when a fire occurs will be described using specific values.

  In FIG. 4, the fire source 30 is generated in a direction around the middle between the heat detection elements 5 b and 5 d. In this case, output values are output from the heat detection elements 5 a to 5 d to the control circuit 21. Here, the output value of the heat detection element 5 will be described in a simplified manner. The output value of the heat detection element 5a is 3, the output value of the heat detection element 5b is 7, the output value of the heat detection element 5c is 2, The output value of the detection element 5d is set to 9.

  First, in order to calculate the output value of each heat detection element 5 as a vector value in the orthogonal coordinate system, the control circuit 21 sets the output value of the heat detection element 5a to (X, Y) = (− 3, 0), heat The output value of the detection element 5b is (X, Y) = (7, 0), the output value of the heat detection element 5c is (X, Y) = (0, -2), and the output value of the heat detection element 5d is (X , Y) = (0, 9). FIG. 4 shows these on an orthogonal coordinate axis, the vector value of the heat detection element 5a is the arrow D, the vector value of the heat detection element 5b is the arrow E, the vector value of the heat detection element 5c is the arrow F, and the heat detection The vector value of the element 5d is an arrow G.

  Then, the control circuit 21 synthesizes vector values obtained by converting the output values of the heat detection elements 5. In FIG. 3, a combination of the four vector values of arrows D to G is an arrow H, and the arrow H indicates the direction of the fire source 30. In the above example, the arrow H becomes (X, Y) = (4, 6), and the angle formed with the X axis is about 60.2 degrees. That is, the fire source 30 is located at a position where the angle between the straight line connecting the center of the cover 1 and the heat detection element 5b and the straight line connecting the center of the cover 1 and the fire source 30 is 60.2 degrees. To do.

With reference to FIG.1 and FIG.2, the operation example of the heat sensor 10 of this invention is demonstrated.
[Description of operation]
First, when a fire occurs, the air around the fire source 30 is heated and convection of a hot air current occurs. When the air around the heat detector 10 is heated by the hot air flow, the electrical resistance of the heat detection element 5 changes, and the output value of the change is output to the control circuit 21 of the fire receiver 20 by the control circuit 12. The

  Next, the control circuit 21 of the fire receiver 20 determines that a fire has occurred when detecting a temperature that exceeds a threshold value for determining fire in any one of the heat detection elements 5a to 5d. When it is determined that there is a fire, the fire receiver 20 outputs a fire signal to the alarm unit, and performs processing such as sounding a buzzer, turning on an indicator lamp, and reporting a fire.

  At the same time, the control circuit 21 specifies the position of the fire source 30 based on the output values of the heat detection elements 5a to 5d by any one of the methods described above. Then, the position information of the fire source 30 is output to the display device 23.

  Finally, the control circuit 21 outputs the position information of the fire source 30 to the display device 23, and the display device 23 displays the position of the fire source 30. As a display method, for example, a map of the entire fire alarm facility provided with the heat detector 10 is displayed, and the positions of the heat detector 10 and the fire source 30 that detected the fire may be displayed on the map.

  As described above, the heat detector 10 according to the present invention is provided with the heat detection elements 5 in the sections partitioned by the partition wall 3, so that the heat detection element 5 closer to the fire source 30 detects a higher temperature. Because it can, the direction of the fire source can be specified.

  In addition, there are four heat detection elements 5, all of which are provided on the same circumference centered on the center of the cover 1. The heat detection elements 5a and 5c are opposed to 5d and 5d, and are point-symmetric. Since it is provided at the position, the position of the fire source 30 can be specified with high accuracy by converting the output value of each heat detection element 5 into a vector value.

  In addition, each heat detection element 5 should just be arrange | positioned at the cover 1 so that the direction of the fire source 30 can be specified, It is not limited to arrangement | positioning shown in FIG.1 and FIG.5, It is arrangement | positioning other than that. Also good. For example, although it has been described that four heat detection elements 5 are provided, other numbers may be used, and at least two heat detection elements may be provided. It is only necessary to have a partition wall so that the same number of partitions as the heat detection elements 5 can be formed on the cover 1. In the case where there are two heat detection elements 5, it can be seen at which position the fire source 30 is located.

  Further, in the embodiment of the present invention, the control circuit 21 of the fire receiver 20 calculates the output value of each heat detection element 5 and specifies the direction of the fire source 30, but the control circuit 12 of the heat sensor 10. However, as with the control circuit 21 of the fire receiver 20, the direction of the fire source 30 may be specified by calculating the output value of each heat detection element 5. Furthermore, the control circuit 12 of the heat detector 10 may determine the fire together with the direction of the fire source 30.

  In the embodiment of the present invention, the heat detection element 5 has been described using a thermistor as shown in FIG. 1, but as shown in FIG. 6, a heat collection pattern 6 is provided on a flexible substrate 9 and a chip thermistor portion 8 is provided. A flat plate-like heat detection element 7 may be used. In the case of such a heat detection element 7, as shown in FIG. 5, four sheets should just be affixed to the side surface of the cover 1, and the adjacent heat detection elements 7 should just be affixed every 90 degree | times. Specifically, the heat detection element 7a faces 7b and the heat detection element 7c faces 7d, and each is provided at a point-symmetrical position with the center of the cover 1 as the center of symmetry.

DESCRIPTION OF SYMBOLS 1 Cover, 3 Partition wall, 5 (5a, 5b, 5c, 5d) Thermal detection element, 6 Heat collection pattern, 7 (7a, 7b, 7c, 7d) Thermal detection element, 8 Chip thermistor part, 9 Flexible substrate, 10 Heat sensor, 12 control circuit, 20 fire receiver, 21 control circuit, 23 display means, 30 fire source, AH arrows.

Claims (6)

In a heat sensor comprising a cover and a heat detection element provided on the cover,
A plurality of the heat detection elements are provided on the same circumference around the center of the cover ,
A heat sensor characterized by specifying a direction of a fire source by a signal output from each of the heat detection elements. In a heat sensor comprising a cover and a heat detection element provided on the cover ,
The cover has a partition wall arranged radially from the central part toward the outer peripheral part,
The heat detection elements are located away from the center of the cover, and are provided one by one between the partition walls,
A heat sensor characterized by specifying a direction of a fire source by a signal output from each of the heat detection elements. The partition wall is in contact with the adjacent partition wall at a right angle,
The heat detector according to claim 2, wherein four heat detection elements are provided, and each of the heat detection elements is provided at a point-symmetrical position with respect to the opposed heat detection elements. In a heat sensor comprising a cover and a heat detection element provided on the cover ,
The heat detection element is composed of a flat chip, and is attached to at least two places on the side of the cover,
A heat sensor characterized by specifying a direction of a fire source by a signal output from each of the heat detection elements. In a heat sensor comprising a cover and a heat detection element provided on the cover,
A plurality of the heat detection elements are provided,
The heat sensor is provided with a control circuit,
The control circuit converts outputs of the plurality of heat detection elements into vector values, and specifies the direction of the fire source by calculating the vector values . A heat detector comprising a cover and a heat detection element provided on the cover;
A fire receiver having a control circuit connected to the heat detector and receiving a signal output from the heat detection element;
In fire alarm equipment with
The cover is provided with a plurality of the heat sensing element sincerely away in,
Wherein the control circuit of the fire receiver converts the output of a plurality of heat detecting element vector value, fire alarm system and identifies the direction of the fire source by calculation of 該Be vector values.

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