JPH09147261A - Fire detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To predict a fire and to estimate the fire detected floor unit where the fire takes place without any arithmetic processing by using a pyroelectric heat detecting element group formed by arraying pyroelectric heat detecting elements in shapes corresponding to fire detected floor surface units divided to specific area corresponding to the fire detected floor. SOLUTION: This device consists of the pyroelectric heat detecting element group 1, an infrared sensor 6 equipped with the sensor microcomputer 5 of a signal processing part which processes the output signals of the pyroelectric heat detecting element group 1, a fire extinguisher group 7 which controls the temperature of the floor surface based on the detected temperature of the floor surface according to the fire detected floor surface units outputted from the sensor microcomputer 5 and extinguishes the fire only at the fire occurrence position if the fire takes places, and a microcomputer 8 which accumulates the detected temperature with time and controls the fire extinguisher group 7. Then the pyroelectric heat detecting element group 1 in the shape corresponding to the fire detected floor surface unit divided to the specific area is used to specify the fire occurrence position without the necessity of arithmetic processing only by monitoring temperature variation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detecting device using a pyroelectric heat detecting element group.

[0002]

2. Description of the Related Art In a conventional fire detection device, an infrared point sensor or an infrared camera is used to detect a fire occurrence or a fire position. In the case of an infrared point sensor, a plurality of infrared point sensors corresponding to the fire detection floor surface are installed and a fire is judged when the infrared point sensor detects a high temperature object or smoke. When the infrared camera is used, the information on the fire-detected floor surface acquired by the infrared camera is image-processed to determine the position of the fire and the high-temperature object.

A method of scanning a pyroelectric heat detecting element arranged one-dimensionally to detect the temperature of a fire-detected floor surface, and image-processing the temperature to determine the position of a fire or a high-temperature object. There is also.

Further, there is also one in which a ceramic element is used as the pyroelectric heat detecting element, and the ceramic element is one-dimensionally arranged and scanned.

[0005]

As in the above-mentioned prior art, a very inexpensive fire detection device can be completed by using an infrared point sensor, but since the temperature of the fire detection floor cannot be measured, the location of the fire occurrence can be determined. There is a problem that the control is complicated because it cannot be determined and a plurality of fire detection floors must be installed.

Further, an infrared camera can be used to accurately measure temperature and detect an accurate position of a fire, but since the amount of information from the infrared camera is large and calculation processing is required, it takes time to determine the fire position. This is necessary, and there is a problem that the control becomes more complicated than when an infrared point sensor is used.

Further, when the pyroelectric heat detecting elements arranged one-dimensionally are scanned, the pyroelectric heat detecting elements are scanned to detect the temperature of the fire detection floor surface. Therefore, it took time to calculate the measured temperature and determine the fire occurrence / fire position.

When a ceramic element is used as the pyroelectric heat detecting element, the sensitivity is low and the response speed is very slow, so that several tens of temperatures cannot be detected within 1 to 2 seconds. There was a problem.

The present invention is a pyroelectric thin film heat detecting element group in which pyroelectric thin film heat detecting elements corresponding to a fire detecting floor surface unit divided into a predetermined area are arranged corresponding to a fire detecting floor surface. A fire detection device that can easily measure the temperature of a fire-detected floor surface unit, determine the fire occurrence position based on the measured temperature without calculation processing, and extinguish only the fire occurrence position by using To do.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a pyroelectric thermal detection element having a shape corresponding to a unit of a fire detection floor surface divided into a predetermined area. A pyroelectric heat detecting element group arranged corresponding to, and a signal processing unit for processing the output signal of the pyroelectric heat detecting element group to the detected temperature, for each fire detection floor surface unit The temperature is detected.

Also, the present invention comprises a fire judging section for judging a fire based on the detected temperature for each unit of the floor surface for which the fire is detected,
A fire extinguishing device for extinguishing the fire-detected floor unit is provided.

Further, the present invention uses a pyroelectric thin film for the pyroelectric heat detecting element.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, pyroelectric thermal detection elements each having a shape corresponding to a fire detection floor surface unit divided into a predetermined area are arranged corresponding to the fire detection floor surface. ,
The fire occurrence position can be specified without the need for arithmetic processing simply by monitoring the temperature for each fire detection floor surface unit detected by the pyroelectric heat detection element or the temperature change. Also, since the temperature is monitored, it is possible to predict a fire.

If a fire extinguishing device is provided for each unit of the fire detection floor surface, it is possible to extinguish the fire only in the fire occurrence range.

Further, by using the pyroelectric thin film for the pyroelectric heat detecting element, the sensitivity is about 7 as compared with the conventional ceramic element.
The temperature accuracy is improved and the high-speed temperature detection is enabled by increasing the responsiveness by about 10 times.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a fire detection floor 2 corresponding to the pyroelectric heat detection element group 1. In addition, FIG. 2 is a pyroelectric heat detection device in which pyroelectric heat detection elements 4 each having a shape corresponding to a fire detection floor surface unit 3 divided into predetermined areas are arranged corresponding to the fire detection floor surface. It is an example of the element group 1. When a ceramic element was used as the pyroelectric heat detection element 4, the ceramic element had a thickness of several hundred μm, so there was a limit to downsizing, and the heat capacity was large, resulting in poor sensitivity.
Further, the responsiveness was not good because the electric polarization of the ceramic was not uniform. When a pyroelectric thin film is used for the pyroelectric heat detecting element 4, since the thickness is as thin as several μm, the sensitivity is about 7 times and the responsiveness is about 10 times that of the ceramic element. It becomes possible to arrange a small-sized and multi-element electric heat detection element, and a shape and arrangement as shown in FIG. 2 are possible.

The shape of the pyroelectric heat detecting elements 4 arranged two-dimensionally is different because the measurement range of one pyroelectric heat detecting element 4 becomes wider as the measuring distance becomes longer. The shape of the pyroelectric heat detecting element 4 is changed according to the distance to the fire detection floor surface unit 3 divided into a predetermined area measured by the pyroelectric heat detecting element 4. Based on the distance from the pyroelectric heat detecting element 4 in the central part of the two-dimensional array to the fire detection floor surface unit 3, the measurement distance increases as the distance increases. Therefore, the pyroelectric heat detecting element 4 in the central portion of the two-dimensional array is the largest and the smaller the circumference.

When the pyroelectric heat detecting element 4 having the shape and arrangement as shown in FIG. 1 is used, the floor surface 2 to be fired can be divided into a predetermined area to detect the temperature. A detection device is possible.

FIG. 3 shows the construction of a fire detecting apparatus of an embodiment in which the fire detection floor surface unit 3 divided into a predetermined area is used as a fire extinguishing unit. An infrared sensor 6 including a pyroelectric thermal detection element group 1 having the shape and arrangement shown in FIG. 1, a sensor microcomputer 5 of a signal processing unit for processing the output signal of the pyroelectric thermal detection element group 1, and a sensor microcomputer. The floor temperature is controlled based on the temperature detected by the fire detection floor unit 3 output from 5.
When a fire occurs, a fire extinguisher group 7 including a plurality of fire extinguishers capable of extinguishing only the fire occurrence location, and a microcomputer 8 of a fire determination unit that controls the fire extinguishing machine group 7 by accumulating the detected temperatures over time The system is configured by.

FIG. 4 shows an outline of control of the fire detection apparatus of the embodiment when the present invention is used. As shown in the figure, the control is mainly composed of two parts: a sensor control part which is carried out by the sensor microcomputer 5 and a device control part of a microcomputer 8 which judges the fire based on the detected temperature and controls the fire extinguishing device group 7. However, it goes without saying that the effects are the same even if the above two controls are performed by one microcomputer.

The system control starts from step 100, proceeds to step 101, drives the sensor 6, measures the temperature of the fire detection floor 2 once, and then executes step 10
Fire detection from pyroelectric heat detection element group 1 by 2 Floor unit 3
The output signal of each is converted into temperature by the sensor microcomputer 5, and the process proceeds to step 103. In step 103, step 102
The detected temperature for each fire-detected floor surface unit 3 is output to the microcomputer 8 and the process proceeds to step 104. In step 104,
In step 103, the detected temperature output to the microcomputer 8 is temporally accumulated for each fire-detected floor surface unit 3, and the process proceeds to step 105. In step 105, it is determined whether or not the measurement this time is the first time. If the current measurement is the first time (NO), the process returns to step 100.

If it is not the first measurement (YES) in step 105, the process proceeds to step 106. Step 106
Then, it is determined whether there is a predetermined temperature change by comparing the detected temperature accumulated up to the previous time in step 104 with the detected temperature this time. When there is no predetermined temperature change (NO), the fire extinguishing equipment group 7 is kept in the OFF state and the process returns to step 100 and is repeated.

If it is determined in step 106 that a fire has occurred (YES), the flow proceeds to step 107, in which the fire extinguishing equipment corresponding to the fire detection floor surface unit 3 having a predetermined temperature change is turned on, Extinguish fire.

By repeating the processing from step 100 to step 107, it is possible to perform temperature management and time accumulation for each fire-detected floor surface unit 3 divided into a predetermined area. A fire detection device as set forth in claim 2 or 3 is possible, in which the fire extinguishing device group 7 can be controlled according to the temperature change situation to extinguish only the floor surface where a fire has occurred.

[0026]

According to the present invention, as is apparent from the above description,
A pyroelectric thermal detection element having a shape corresponding to each fire detection floor surface divided into a predetermined area is used by using a pyroelectric thermal detection element group arranged corresponding to the fire detection floor surface. It is possible to predict the fire by detecting the temperature of each fire detection floor surface unit, and to estimate the fire detection floor surface unit in which a fire has occurred without performing arithmetic processing.

Further, by providing a fire extinguishing device corresponding to each fire detection floor surface unit, when a fire occurs, the fire detection floor surface unit that has nothing to do with the fire is not affected by the fire extinguishing. Fire detection that caused a fire can be extinguished only for each floor surface.

Further, by using a pyroelectric thin film for the pyroelectric heat detecting element, the sensitivity and responsiveness are improved, and the pyroelectric heat detecting element can be arranged in a small size and in multiple elements.

[Brief description of the drawings]

FIG. 1 is a temperature detection range diagram of a pyroelectric heat detection element group 1 arranged two-dimensionally.

[Figure 2] Shape and arrangement of pyroelectric heat detection elements corresponding to fire detection floor unit 3

FIG. 3 is a configuration diagram of a fire detection device according to an embodiment of the present invention.

FIG. 4 is a flow chart of control of the fire detection device according to the embodiment of the present invention.

[Explanation of symbols]

 1 Pyroelectric heat detection element group 2 Fire detection floor surface 3 Fire detection floor unit 4 Pyroelectric heat detection element 5 Sensor microcomputer 6 Infrared sensor 7 Digestive equipment group 8 Microcomputer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidenori Okuda 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A pyroelectric heat detection element for detecting infrared rays for each fire detection floor surface unit divided into a predetermined area, and the pyroelectric heat detection elements are arranged corresponding to the fire detection floor surface. A fire detection device comprising: a pyroelectric heat detecting element group; and a signal processing unit for processing an output signal of the pyroelectric heat detecting element group. 2. A fire determination unit for determining a fire occurrence based on a detected temperature, and a fire extinguishing device for extinguishing a fire on each floor surface when the fire determination unit determines a fire.
The fire detection device as described. 3. The fire detecting device according to claim 2, wherein a pyroelectric thin film is used for the pyroelectric heat detecting element.