JPH06282774A - Radiation type fire sensor - Google Patents

Abstract

PURPOSE:To provide a radiation type fire sensor which can clearly the defective operations caused by a dirty light transmissive cover and the fault of a photodetecting circuit including a photodetector and also can decide the degrees of dirtiness and deterioration. CONSTITUTION:A radiation type fire sensor is provided with the outer LED 4L and 4R which are placed outside a light transmissive cover 7 and emit the 1st pseudo flame signals, the inner LED 3Lb, 3Lr, 3Rb and 3Rr which are placed inside the cover 7 and emit the 2nd pseudo flame signals, a 1st action test means which makes the light receiving elements 1L and 1R receive the 1st flame signals to test the fire detecting actions of these elements, a 2nd action test means which makes the light receiving element 1L, 2L, 1R and 2R receive the 2nd pseudo flame signals to test the fire detecting actions of these elements, and a sensor control circuit including a dirtiness degree test means which decides the propriety of the degree of dirtiness of the cover 7 from the extinction rate of the cover 7 during the test of the 1st action test means, and a receiving sensitivity test means which decides the propriety the degrees of deterioration of the photodetecting elements from the receiving sensitivity of these elements during the test of the 2nd action test means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiant fire detector for detecting a radiant light emitted from a flame to detect a fire, and more particularly to a radiant fire detector having a self-test function by a pseudo flame signal.

[0002]

2. Description of the Related Art Conventionally, as a radiation type fire detector, a constant radiation type that detects when the radiant energy of a specific wavelength band emitted from a flame has reached a certain amount or more, a flicker that detects a flicker peculiar to a flame There are various formulas, such as a two-wavelength formula and a three-wavelength formula, which compare the magnitudes of radiant energy in a plurality of wavelength bands. Then, in these radiant fire detectors, the radiant light such as ultraviolet rays or infrared rays emitted from the flame is received by a light receiving element (for example, a photodiode, a pyroelectric element,
There are many things to detect with a discharge tube).

A transparent cover made of dust-proof transparent glass, an optical filter, or the like is provided on the front surface of the light receiving element, and radiant light from the flame passes through the transparent cover to reach the light receiving element. A structure that allows light to be received, but blocks the passage of foreign matter, moisture, gas, etc. from the outside (eg, airtight structure)
In many cases, the light receiving element and the internal fire detection circuit are protected.

[0004]

However, even if the radiation-type fire detector is provided with a light-transmitting cover having the above-mentioned airtight structure to protect light-receiving elements such as pyroelectric elements and photodiodes, the light-receiving sensitivity of these elements is also reduced. It is difficult to maintain various characteristics such as the same as in the initial state for a long period of time, and the sensitivity deteriorates with the lapse of time, sometimes flame detection cannot be performed. Also, when time passes after the fire detector is installed, the translucent cover is contaminated by dust and the like contained in the outside air, and the light transmittance is gradually reduced, and as a result, the amount of light received by the light receiving element is reduced. The flame may not be detected due to the decrease of

Therefore, in some high-performance fire detectors, a pseudo flame light source provided outside the translucent cover is turned on to determine whether or not the fire detector normally performs the fire detection operation. Some have tests. However, when fire detection cannot be performed in the operation test, malfunction occurs due to contamination of the translucent cover, and if the dirt is cleaned, the fire detection operation returns to normal, or the light receiving circuit including the light receiving element fails, There was a problem that it was not possible to determine whether the maker required repair.

The present invention has been made in order to solve the above problems, and a light receiving element provided inside a light transmissive cover receives a radiant transmitted light from a flame to detect a fire. When the fire detector is malfunctioning, the malfunction due to the contamination of the translucent cover and the failure of the light receiving circuit including the light receiving element are clearly discriminated, and the degree of contamination of the translucent cover and It is an object of the present invention to obtain a radiation fire detector that can determine the degree of deterioration of a light receiving element.

[0007]

A radiant fire sensor according to a first aspect of the present invention is provided with a translucent cover that transmits radiant light emitted from a flame, and an inner side of the translucent cover. A light receiving element for receiving the transmitted light from the transparent cover,
A radiant fire detector having a means for detecting a fire based on a detection signal of the light receiving element, the first fire testing device being provided outside the translucent cover and driven by a first operation test means.
Of the first test light-emitting element that emits the pseudo-flame signal of No. 1 and transmits the light-transmitting cover to irradiate the light-receiving element, and a first pseudo-flame signal by driving the first test light-emitting element. Of the light-transmissive cover by illuminating the light-receiving element to test whether the fire-sensing means operates normally based on the detection signal of the light-receiving element. It is provided on the inner side and is driven by the second operation test means to drive the second
Of the second test light-emitting element for directly or indirectly irradiating the light-receiving element, and driving the second test light-emitting element to emit the second pseudo-flame signal. Second operation test means for irradiating the light receiving element and testing whether the means for detecting the fire normally operates based on a detection signal of the light receiving element.

According to a second aspect of the present invention, in the radiant fire detector, the detection signal level of the light receiving element is measured at the time of the test of the first operation test means, and the measured value is a preset contamination level. A stain degree test means including a stain degree determination means for determining whether or not the degree is equal to or more than the lower limit value and outputting a signal indicating whether or not the stain degree of the translucent cover is acceptable according to the determination result, During the test of the second operation testing means, the detection signal level of the light receiving element is measured, and it is determined whether or not the measured value is equal to or higher than the lower limit value of the deterioration allowable range set in advance. According to the first aspect of the present invention, the radiation fire detector according to claim 1 is further provided with a light receiving sensitivity testing means including a deterioration degree determining means for outputting a signal indicating whether or not the light receiving element is deteriorated.

In the radiation type fire detector according to claim 3 of the present invention, the detection signal level of the light receiving element is measured during the test of the first operation testing means, and the measured value and the extinction rate reference value are used. The ratio of the extinction ratio calculating means for calculating the extinction ratio of the light-transmitting cover, and the calculated value of the extinction ratio is equal to or more than the lower limit value of the preset extinction ratio allowable range. A stain degree determining means including a stain degree determining means that outputs a signal indicating whether or not the stain degree of the light-transmitting cover is stainable according to the determination result, and the second operation test means, in the test, Light receiving sensitivity calculating means for measuring the detection signal level of the light receiving element and calculating the ratio of the measured value and the light receiving sensitivity reference value as the light receiving sensitivity of the light receiving element, and the calculated value of the light receiving sensitivity set in advance. Determine whether it is greater than or equal to the lower limit of the sensitivity tolerance range. The radiation fire detector according to claim 1, further comprising a light-reception sensitivity test means including a light-reception sensitivity determination means for outputting a signal indicating whether or not the deterioration degree of the light-receiving element is acceptable according to the determination result. Is.

In the radiant fire detector according to claim 4 of the present invention, a plurality of sensing areas are set in advance as substantially independent three-dimensional spaces, and the flames in each of the set sensing areas are radiated respectively. A radiant light that is transmitted through each of the sensing regions in each direction, and a translucent cover,
Based on a plurality of light-receiving elements provided inside the light-transmitting cover and receiving transmitted light of each direction of the light-transmitting cover for each sensing region, and a detection signal of each of the plurality of light-receiving elements. A radiant fire detector having means for detecting a fire for each of the plurality of sensing areas, wherein each of the plurality of sensing areas is provided outside the translucent cover,
A plurality of first pseudo flame signals are emitted by the driving of the sensing areas by the first operation test means, and the plurality of first irradiating elements each of which senses the light receiving elements of the sensing areas through the transparent cover. One test light-emitting element and the plurality of first
Driving the test light-emitting elements individually to emit a first pseudo flame signal, irradiating the light-receiving elements for each of the plurality of sensing regions individually, and the plurality of light-receiving elements for each of the plurality of light-receiving elements based on the detection signal. First operation test means for respectively testing whether or not the fire sensing means operates normally for each sensing area, and each of the plurality of sensing areas is provided inside the translucent cover, A plurality of second test devices that emit second pseudo flame signals by driving the respective sensing areas by the second operation test means and directly or indirectly irradiate the light receiving elements of the respective sensing areas. A light emitting device and the plurality of second
Driving the test light-emitting elements individually to emit the second pseudo flame signal, irradiating the light-receiving elements for each of the plurality of sensing regions individually, and the plurality of light-receiving elements based on the detection signal for each of the light-receiving elements. Second operation test means for respectively testing whether or not the fire detecting means operates normally for each of the detection areas.

According to a fifth aspect of the present invention, in the radiation type fire detector, the detection signal level of the light receiving element irradiated to each of the plurality of sensing areas is measured during the test of the first operation test means. It is determined whether or not each of the measured values is equal to or more than the lower limit value of the preset contamination level allowable range, and the determination result indicates the contamination level of each of the plurality of sensing areas of the translucent cover. A pollution level test unit including a pollution level determination unit that outputs a signal indicating yes or no, and a detection signal level of a light receiving element irradiated to each of the plurality of sensing areas during a test of the second operation test unit. Respectively, it is determined whether or not each measured value is equal to or more than the lower limit value of the deterioration allowable range set in advance, and whether the degree of deterioration of the light receiving element for each sensing region is acceptable or not according to the determination result. Show no Signal is obtained and a light receiving sensitivity testing means including a deterioration degree determination means for outputting respectively added to radiant fire detector according to claim 4.

According to a sixth aspect of the present invention, in the radiant fire detector, the detection signal level of the light receiving element irradiated to each of the plurality of sensing areas is measured during the test of the first operation test means. A light extinction ratio calculating means for calculating a ratio between each measured value and a light extinction ratio reference value as a light extinction ratio for each of a plurality of sensing areas of the translucent cover; Whether or not the calculated value of the rate is equal to or more than the lower limit value of the preset light attenuation rate allowable range, and the degree of contamination of each of the plurality of sensing area directions of the translucent cover is determined by the determination result. Contamination degree test means including a contamination degree determination means for outputting a signal indicating yes or no, respectively, and a detection signal of a light receiving element irradiated to each of the plurality of sensing areas at the time of testing by the second operation test means. Measure each level,
A light receiving sensitivity calculating means for calculating a ratio between each of the measured values and the light receiving sensitivity reference value as the light receiving sensitivity of the light receiving element for each of the sensing regions, and a calculated value of the light receiving sensitivity for each of the sensing regions are preset. And a light receiving sensitivity determining means for determining whether or not the light receiving sensitivity is lower than or equal to the lower limit of the allowable range, and outputting a signal indicating whether or not the degree of deterioration of the light receiving element in each of the sensing regions is acceptable or not based on the determination result. A light-receiving sensitivity test means including the light-sensing sensitivity is added to the radiation-type fire detector according to the fourth aspect.

[0013]

In the invention according to the first aspect, the translucent cover that transmits the radiant light emitted from the flame and the light transmitted through the translucent cover that is provided inside the translucent cover are received. In the radiant fire detector, the first test light-emitting element is provided outside the translucent cover. The first pseudo-flame signal is emitted by driving the operation test means, and the light-receiving element is irradiated with light through the light-transmitting cover. A first operation test means drives the first test light emitting element to emit a first pseudo flame signal to irradiate the light receiving element, and senses the fire based on a detection signal of the light receiving element. Test whether the means work properly. The second test light-emitting element is provided inside the translucent cover, and is driven by the second operation test means to generate the second test light-emitting element.
The pseudo flame signal is emitted to directly or indirectly irradiate the light receiving element. Second operation test means drives the second test light emitting element to emit a second pseudo flame signal to irradiate the light receiving element, and senses the fire based on a detection signal of the light receiving element. Test whether the means work properly.

According to a second aspect of the present invention, a stain degree test means and a light receiving sensitivity test means are added to the invention of the first aspect, and the stain degree test means is a test of the first operation test means. At this time, the detection signal level of the light receiving element is measured, and by the built-in contamination degree determination means, it is determined whether or not the measured value is equal to or higher than the lower limit value of the contamination degree allowable range set in advance. Outputs a signal indicating whether the light transmissive cover is dirty or not.
Further, the light receiving sensitivity test means measures the detection signal level of the light receiving element at the time of the test of the second operation test means,
A built-in deterioration degree judging means judges whether or not the measured value is equal to or more than a lower limit value of a deterioration allowable range set in advance, and a signal indicating whether or not the deterioration degree of the light receiving element is possible according to the judgment result. Is output.

According to a third aspect of the present invention, a stain degree test means and a photosensitivity test means are added to the invention of the first aspect, and the stain degree test means is provided with a built-in extinction ratio calculation means. During the test of the first operation test means, the detection signal level of the light receiving element is measured, and the ratio between the measured value and the reference value of the light reduction ratio is calculated as the light reduction ratio of the translucent cover. Then, by the stain degree determining means, it is determined whether or not the calculated value of the light extinction rate is equal to or higher than the lower limit value of the preset light extinction rate allowable range, and the stain degree of the translucent cover is determined by the determination result. A signal indicating whether or not is output. Further, the light-reception sensitivity test means uses a built-in light-reception sensitivity calculation means to perform a test of the second operation test means.
The detection signal level of the light receiving element is measured, and the ratio between the measured value and the light receiving sensitivity reference value is calculated as the light receiving sensitivity of the light receiving element. Then, the light-reception sensitivity determining means determines whether or not the calculated value of the light-reception sensitivity is equal to or more than the lower limit value of the preset light-reception sensitivity allowable range, and whether the deterioration degree of the light-receiving element is acceptable or not based on the determination result. Is output.

In the invention according to the fourth aspect, a plurality of sensing areas are set in advance as substantially independent three-dimensional spaces, and the radiant light emitted from the flame in each of the set plurality of sensing areas is set. A plurality of light-transmitting covers that transmit the respective sensing areas in different directions, and a plurality of light-transmitting covers that are provided inside the light-transmitting cover and that receive the light transmitted in the respective directions of the light-transmitting cover for each of the sensing areas. Of the plurality of light receiving elements, and a means for detecting a fire in each of the plurality of sensing areas based on the detection signal of each of the plurality of light receiving elements, the plurality of first test light emitting elements are provided. , Each of the plurality of sensing areas is provided outside the translucent cover, and each of the sensing areas is driven by the first operation test means to emit a first pseudo-flame signal. sex It passes through the bar irradiates each light receiving element of the respective sensing region. The first operation test means is
The plurality of first test light emitting elements are individually driven to
The pseudo-flame signal is emitted to individually illuminate the light receiving elements of each of the plurality of sensing areas, and the means for detecting a fire in each of the plurality of sensing areas is normally operated based on the detection signal of each of the light receiving elements. Each test whether it works. The plurality of second test light-emitting elements are provided inside the light-transmitting cover for each of the plurality of sensing areas, and are driven by the second operation test unit for each of the sensing areas to generate the second testing light-emitting element. A pseudo flame signal is emitted to directly or indirectly irradiate the light receiving element of each of the sensing areas. The second operation test means individually drives the plurality of second test light emitting elements to emit a second pseudo flame signal, and individually irradiates the light receiving elements of each of the plurality of sensing regions, Based on the detection signal of each light receiving element, it is tested for each of the plurality of sensing areas whether or not the means for sensing a fire operates normally.

In the invention according to claim 5, a stain degree test means and a light receiving sensitivity test means are added to the invention according to claim 4, and the stain degree test means is a test of the first operation test means. At this time, the detection signal level of the light-receiving element irradiated to each of the plurality of sensing areas is measured, and the measurement value for each direction by the built-in contamination degree determination means is within a preset contamination degree allowable range. Whether or not it is equal to or more than the lower limit value is discriminated, and, based on the discrimination result, a signal indicating whether or not the degree of contamination of each of the plurality of sensing regions of the translucent cover is acceptable or not is output. Further, the light-receiving sensitivity test means measures the detection signal level of the light-receiving element irradiated to each of the plurality of sensing regions during the test of the second operation test means, and the built-in deterioration degree determination means allows each of the detection signals to be detected. It is determined whether or not the measurement value for each sensing area is equal to or more than the lower limit value of the deterioration allowable range set in advance, and the determination result indicates whether the degree of deterioration of the light receiving element for each sensing area is acceptable or not. Output each signal.

According to a sixth aspect of the present invention, a stain degree test means and a photosensitivity test means are added to the invention according to the fourth aspect, and the stain degree test means is provided with a built-in extinction ratio calculation means. During the test of the first operation test means, the detection signal level of the light receiving element irradiated to each of the plurality of sensing regions is measured, and the ratio of each measured value to the reference value of the extinction ratio is used for the light transmission. It is calculated as the extinction ratio for each of the plurality of sensing area directions of the property cover. Then, the stain degree determining means determines whether or not the calculated value of the light reduction rate for each direction is equal to or more than the lower limit value of the preset light reduction rate allowable range, and the light transmission rate is determined based on the determination result. A signal indicating whether or not there is a degree of contamination in each of the plurality of sensing area directions of the property cover is output. Further, the light-reception sensitivity test means measures the detection signal level of the light-receiving element irradiated to each of the plurality of sensing areas by the built-in light-reception sensitivity calculation means at the time of testing the second operation test means, The ratio between the measured value and the light-receiving sensitivity reference value is calculated as the light-receiving sensitivity of the light-receiving element for each sensing region. Then, the light-receiving sensitivity determining means determines whether or not the calculated value of the light-receiving sensitivity for each of the sensing areas is equal to or more than the lower limit value of the preset light-receiving sensitivity allowable range, and for each of the sensing areas based on the determination result. A signal indicating whether or not the light receiving element is deteriorated is output.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a radiation type fire detector showing an embodiment of the present invention. 2 is a structural view of the radiant fire detector of FIG. 1, and FIG. 2 (a) is a plan view thereof,
(B) has shown the sectional view. 3 is a diagram showing two sensing areas on the left side and the right side of the radiant fire detector of FIG. 1, and FIG. 4 is a diagram of the light receiving element and the internal light emitting diode (LE) of FIG.
It is a figure which shows the positional relationship with D).

First, it will be explained that a single fire sensor can have multiple sensing areas. When the radiant fire detector of the embodiment of FIG. 1 is installed on a wall surface, for example, the central axis is 45 degrees to the left and right with respect to the front direction (direction perpendicular to the wall surface) of the fire sensor. It has three almost independent fire sensing areas in three-dimensional space. FIG. 3 shows the left and right sensing areas in a horizontal plane when the radiant fire detector of FIG. 1 is installed on a wall surface,
For example, the sensing area can be up to about 50 meters in a linear distance perpendicular to the light receiving surface of the light receiving element.
The radiant light emitted from the flames in the sensing areas on the left and right sides of FIG. 3 are respectively received by the light receiving elements arranged such that the light receiving directional characteristics thereof match the sensing area in each direction.

1 to 4, 1L and 1R are blue light components (for example, wavelengths of 0.6 to 0.7) of the infrared light emitted from the flames generated in the left and right sensing areas, respectively.
It is a blue light receiving element for separately receiving a component of about 5 μm, which is also referred to as a short wavelength component in the present invention). In this embodiment, both photodiodes are used. 2L, 2R
Is a red light component (for example, a component having a wavelength of about 0.8 to 2 μm) in the infrared light emitted from the same flame generated in each of the left and right sensing areas, and is a long wavelength component in the present invention. Red light receiving element for separately receiving light), and in this embodiment, a pyroelectric element (an element that generates a voltage or a pyroelectric current when infrared rays are absorbed to cause a temperature change) is used together. Then, the photodiode 1L and the pyroelectric element 2
L is a light receiving sensor in the left side sensing area of FIG. 3, and the photodiode 1R and the pyroelectric element 2R are light receiving sensors in the right side sensing area of FIG. 3, respectively detecting the blue light component and the red light component of the flame separately.

3Lb and 3Lr are blue light receiving photodiodes 1 on the left side, respectively, when a light receiving sensitivity test is performed.
L and the left side red light receiving pyroelectric element 2L are separately irradiated, so that red light in the same band as the flame flashes and emits at a flame fluctuation frequency of about 8 to 12 Hz.
In this embodiment, a light emitting diode is used, and it is provided inside the light receiving glass 7. Similarly, 3Rb, 3Rr
When the light sensitivity test is performed, the red light in the same band as the flame that separately illuminates the right blue light receiving photodiode 1R and the right red light receiving pyroelectric element 2R blinks at about 8 to 12 Hz. The second test light-emitting element for the right side, which emits light, is provided inside the light-receiving glass 7 in this embodiment, and is hereinafter referred to as the right-side internal LED. Internal LED3 on the left or right side
The positional relationship between Lb, 3Lr, 3Rb, 3Rr and the photodiodes 1L, 1R and the pyroelectric elements 2L, 2R which are light receiving elements is shown in FIG.

4L and 4R are provided outside the light-receiving glass 7 to test the degree of contamination (specifically, the light transmittance) on the left and right light-transmitting portions of the light-receiving glass 7, and are provided with flames. The red light in the same band as
The first and second light-emitting elements for the first test for flashing and emitting light at a frequency of Hz, and at the time of a stain level test, the pseudo-light of the flame emitted from the left-side or right-side direction is received by the light-receiving glass 7 respectively. The photodiode 1L on the left side and the photodiode 1R on the right side, which are inside, are separately illuminated. In this embodiment, a light emitting diode is used as a light emitting element, which will be hereinafter referred to as left and right external LEDs.

Reference numerals 5L and 5R are operation / fire indicator lights on the left side and the right side, respectively.
A color LED is used, a green LED is used as an operation indicator, and a red LED is used as a fire indicator. The display state by the two-color LED is performed based on the instruction of the receiver which transmits the flame detection signal to the receiver by the fire detector and receives the flame detection signal. In this embodiment, the flame is first displayed. Flashing lighting by the green LED is detected, and flashing lighting by the red LED is carried out when the second continuous flame after the initial detection signal is restored (reset) by the receiver is detected. After the continuous flame detection signal is confirmed three or more times by the receiver, the red LED continuously lights. In addition to the above three display states, the two-color LED display mode is often combined with flashing lighting (the flashing frequency may be low or high) and continuous lighting or extinction for each of the two LEDs. Possible display modes are. Table 1 below shows an example of the display mode.

[0025]

[Table 1]

In this embodiment, when the fire detector receives the irradiation light from the pseudo-flame light source of the inspection tester to perform the inspection test, it is determined that the inspection test by the tester is underway. In order to notify to, the light modulated at a frequency different from the frequency band included in the flame from the inspection notification signal generating means provided in advance in the tester,
For example, it emits light that blinks at about 500 Hz. Reference numeral 6 is a light receiving element for the inspection notification signal generated from this tester, which is a photodiode for receiving the light blinking at about 500 Hz in this example. The inspection tester will be described with reference to FIGS. 6 and 7. Reference numeral 7 denotes a light-receiving glass, which transmits a flame signal at the time of a fire through the light-receiving glass 7, and the photodiodes 1L, 1R and the pyroelectric elements 2L, 2
Let R receive light. 8L and 8R are the left external L respectively
ED4L, operation / fire indicator light 5L, and external LE on the right side
It is a transparent glass provided on the D4R and the operation / fire indicator light 5R. 9A and 9B are case A and case B of this fire detector, respectively.

Reference numerals 11L and 11R in FIG. 1 denote preamplifiers for amplifying received light output signals of the photodiodes 1L and 1R, respectively, and reference numerals 12L and 12R denote pyroelectric elements 2L and 2R, respectively.
Preamplifier for amplifying the received light output signal of
R, 14L and 14R are preamplifiers 11L and 11L, respectively.
An amplifier that amplifies the output signals of R, 12L, and 12R. Here, the preamplifiers 11L, 11R, 12L, 1
Since the 2R and the amplifiers 13L, 13R, 14L, and 14R amplify only the flame signal of Mako among the output signals obtained from the respective light receiving elements, for example, an alternating current of about 8 to 12 Hz, which is the fluctuation frequency band of the flame at the time of fire. It is designed so that only the signal is extracted and amplified by a built-in band pass filter (BPF). For example, it is designed as a narrow band amplifier incorporating an active filter, a direct current component of an input signal and a high band component of about 12 Hz or more are attenuated, and only the narrow band signal is amplified.

Further, the preamplifier 11L and the amplifier 13L, 1
The two-stage amplifier circuit consisting of 2L and 14L, 11R and 13R, or 12R and 14R has high gain and high sensitivity, so even in the case of a distant or small fire where the radiant energy of the fire is small, sufficient measurement values can be obtained. Is used as a circuit to obtain. Since the amplifier circuit including only the preamplifier 11L, 12L, 11R, or 12R has a low gain and low sensitivity, the output of the amplifier circuit does not saturate even when the radiant energy of a fire is large and the measured value is correct. Is used as a circuit to obtain. 15L-18L and 15R-
18R is a smoothing circuit, which is composed of, for example, a resistor and a capacitor, receives the output signal of the preamplifier or the amplifier, outputs a smoothed signal of the input signal, and supplies the smoothed signal to the sensor control circuit 20.

The sensor control circuit 20 selects either the output of the smoothing circuit to which the preamplifier output is input or the output of the smoothing circuit to which the amplifier output is input, according to the magnitude of the radiant light energy of the fire. Further, by controlling the amplification degree of the preamplifier or the amplifier, the signal value in the linear region in which the light reception signal level exists between the minute level and the saturation level is measured. Reference numeral 19 is an amplifier for amplifying the output signal of the inspection notification signal light-receiving element 6, but it is not always operable, and when the fire detector receives an inspection start permission signal from an external receiver or repeater, the center control is performed. It is an amplifier that is set from an inoperable state to an operable state by the circuit 20.

A sensor control circuit 20 and a transmission control circuit 21 each include a microprocessor MPU, a plurality of read only memory ROMs, a plurality of random access memory RAMs, an input / output (I / O) interface and the like. It is built-in.

FIG. 5 is a block diagram showing an example of the sensor control circuit shown in FIG. In FIG. 5, MPU1 and R
The OM1 to ROM9, the RAM1 to RAM6 and the I / O interface are coupled to each other via a data bus and an address bus. And in this embodiment, RO
M1 is a storage area for the control program, ROM2 is a storage area for the normal range reference value of the received light output signal obtained through the light receiving element and the amplifier, ROM3 is a storage area for the correctable range threshold value of the light receiving element alone, and ROM4 is the light receiving area. A storage area for a threshold value of a stain-correctable range of a received light output signal obtained via an element and an amplifier, a ROM 5 storage area for a reference value of extinction ratio, a ROM 6 storage area for a threshold value for fire judgment, and RO
M7 is a read-only memory assigned to an address code assigned to each fire detector for identifying a plurality of fire detectors, a storage area for the type code, and a ROM 8 for each of other auxiliary storage areas.

RAM 1 is a data work area, RAM
2 is an area for storing the extinction ratio data, RAM 3 is an area for storing a light receiving sensitivity calculated value of the light receiving element alone, RAM 4 is an area for storing a light receiving output value from the light receiving sensor, RAM 5 is a timer area, RA
M6 is a readable / writable memory assigned to each of the other auxiliary storage areas. The I / O interface is
It contains an A / D converter, a multiplexer, an output port, an input port, etc. inside. This multiplexer selects an analog input signal from the smoothing circuits 15L to 18L and 15R to 18R and the amplifier 19 and supplies the analog input signal to the A / D converter.
The / D converter converts this into digital data to enable digital signal processing within the sensor control circuit. The output port outputs a lighting control signal to, for example, the lighting circuit, and the input port receives data from the transmission control circuit 21, for example.

Reference numeral 22 denotes a signal transmission / reception unit, which is a reception circuit, a data serial / parallel conversion circuit, a transmission circuit, and a data parallel / parallel circuit.
It is composed of a serial conversion circuit or the like, and transmits / receives data to / from a receiver or a repeater via a signal transmission line under the control of the transmission control circuit 21. 23L and 23R are based on the output signal from the sensor control circuit 20, respectively, and
Lighting circuit for controlling lighting of L and 4R, 24L and 24R
Is also a lighting circuit that controls lighting of the internal LEDs 3Lb, 3Lr and 3Rb, 3Rr based on output signals from the sensor control circuit 20, respectively.

25L and 25R are based on the output signal from the sensor control circuit 20, and the operation / fire indicator lamp 5 is provided.
It is a lighting control circuit for controlling lighting of L and 5R (including continuous lighting and flashing lighting). Clock circuits 26 and 27 both generate respective clock signals and supply them to the sensor control circuit 20 and the transmission control circuit 21. Reference numerals 28 and 29 are reset circuits, which generate reset signals by initial operation after power-on and by manual operation, and supply them to the sensor control circuit 20 and the transmission control circuit 21.

6A and 6B are external views of a tester for inspecting a fire detector. FIG. 6A is a side view and FIG. 6B is a front view. In FIG. 6, 31L and 31R are light emitting elements (for example, light emitting diodes) that emit light at the flame fluctuation frequency of about 8 to 12 Hz in the infrared light band of the flame, as left and right pseudo flame signals. . Further, reference numeral 32 is a check notification signal for informing the relevant fire sensor that it is undergoing an inspection test while inspecting a fire detector by this inspection tester, and a frequency higher than the fluctuation frequency of the flame ( In this embodiment, about 500H
It is a light emitting element which emits light in z). Further, as shown in (a) of FIG. 6, the inspection tester is provided with a switch for selecting one of the three positions of left side (L), right side (R), and both left and right (center position). , 8 to 12 Hz light emitting element 31L or 31R, or both of them are selected to emit light. In the following example, the case where the inspection test is performed on each of the left side (L) and the right side (R) will be described.

FIG. 7 is a diagram showing the positional relationship between the fire detector and the inspection tester at the time of inspection. In FIG. 7, at the time of inspection, the front surface of the inspection tester is pressed until it covers the light-receiving glass 7 of the fire detector. As a result, the light emitted from the light emitting element 31L or 31R for 8 to 12 Hz is received by the photodiode 1L and the pyroelectric element 2L or the photodiode 1R and the pyroelectric element 2R, respectively.
The light emitted from the 0 Hz light emitting element 32 is received by the inspection notification signal light receiving element 6, and the fire detector can be inspected.

In the above embodiment, the MPU1, ROM1 and ROM6 of the sensor control circuit 20 are an example of fire detection means, the external LEDs 4L, 4R are an example of the first test light emitting element, and the sensor control circuit 20. MPU1,
ROM1, ROM4, ROM5 and lighting circuits 23L, 23
R is an example of a first operation test means. Also, the internal LE
D3Lb, 3Lr, 3Rb, and 3Rr are examples of the second test light emitting element, and MPU1 and R of the sensor control circuit 20 are included.
OM1, ROM2, ROM3 and lighting circuits 24L, 24R
Is an example of the second operation test means. Further, the MPU1, ROM1 and ROM4 of the sensor control circuit 20 are an example of the stain degree determining means, and similarly the MPU1, ROM1 and RO.
The M2 and the ROM 3 are an example of the light receiving sensitivity determining means. In addition, the MPU1, ROM1 and ROM of the sensor control circuit 20
5 is an example of the extinction ratio calculation means, and is also MPU1, R
The OM1 and the ROM2 are an example of the light receiving sensitivity calculating means.

FIG. 8 is a flow chart showing the main routine of the control program for the radiant fire detector of FIG.
9 and 10 are flowcharts showing No. 1 and No. 2 of the reception interrupt program of the radiant fire detector of FIG. FIG. 11 is a flow chart showing a test program for the radiant fire detector of FIG. 12 and 13 are flow charts showing No. 1 and No. 2 of the flame detection program of the radiant fire detector of FIG. 8 to 13 below
The operation of the fire detector of FIGS. 1 and 4 will be described with reference to FIG.

In step S31 of FIG. 8, the fire detector performs an initial process after the power is turned on. As the initial processing, for example, clearing of RAM data included in the sensor control circuit 20 and the transmission control circuit 21 and R
Sum check of OM data (check of added value of data), storage of initial data for correction of the light receiving element alone in RAM 3 of FIG. 5, clear of timer, counter, etc., time required for stabilizing amplifier (for example, about 0.5 seconds) The operation such as standby of (about) is performed.

In step S32 of FIG. 8, the sensor control circuit 20 in the fire detector uses the I / O interface of FIG. 5 to smooth the output signal of each light receiving sensor by the smoothing circuit 15L.
-18L, 15R-18R are read, the value is quantized, and it stores in RAM4. The I / O interface sequentially selects one signal from the eight input signals output from each of the smoothing circuits by a built-in multiplexer on the basis of a command from the MPU 1 and outputs the selected signal to A / O.
Quantization is performed by the D converter, and the quantized data is sequentially RA
The final fire monitoring data is stored in M4 and the calculation for calculating the average value of the stored plural data is performed.

The sampling frequency of the data passed through the A / D converter is preferably at least twice the maximum frequency of flame fluctuation of 12 Hz, for example 25 Hz or more, based on the Nyquist sampling theorem. The sampling cycle is preferably 0.04 seconds or less). Further, the calculation of the average value of a plurality of sampled data eliminates the influence of the maximum value and the minimum value of the sample data and has an integral function, so that it is desirable that the number of sample data is as large as possible. However, since the time allowed from flame generation to fire detection is generally restricted, within the range of this time restriction, it is possible to detect the long-wavelength and short-wavelength light receiving sensors for the left and right sensing areas, respectively. A large number of sample data are collected, the average value of the collected data is calculated, and this value is used as fire monitoring data in each wavelength range.

When the output level of the light receiving sensor is high, the signal from the amplifier that has passed through the smoothing circuit becomes the saturation level. Therefore, the signal that has passed through the smoothing circuit from the preamplifier at the previous stage is taken in and the linear signal before the saturation level is reached. The signal level in the area is measured.

In step S33 of FIG. 8, the sensor control circuit 20 determines whether or not the light receiving element alone needs to be corrected. This is the necessity of correction for the photosensitivity of each of the photodiodes 1L, 1R or the pyroelectric elements 2L, 2R that deteriorates over time after use. Therefore, the internal LEDs 3Lb, 3Lr and 3R are set at predetermined intervals.
b, 3Rr are driven to measure the received light output values of the left photodiode 1L and the pyroelectric element 2L and the left photodiode 1R and the pyroelectric element 2R, respectively, and the ratio between the measured value and the reference value at the initial stage of installation is measured. Is calculated as the light receiving sensitivity, and the calculated value is stored in the RAM 3 of FIG.

The calculated value of the light receiving sensitivity is 1.00 as an initial value at the time of installation, and is 0.9 if the light receiving sensitivity is lowered.
5, 0.90, 0.85 and so on. Therefore, FIG.
The MPU 1 reads the calculated light-reception sensitivity value of the corresponding light-reception sensor in the RAM 3 and outputs it in the normal range (for example, 1.00 to 0.8).
5) It is determined whether or not it is within the normal range stored in the ROM 2, and it is determined that the correction is not necessary, and step S
35, the correction value is determined to be necessary when the value is equal to or lower than the lower limit value of the normal range, and in step S34, the correction value (the reciprocal number of the light receiving sensitivity, the reciprocal number in the case of 0.60 immediately) 1 / 0.6) is multiplied to perform the correction calculation. As a result, the fire monitoring data is removed from the influence of the decrease in the light receiving sensitivity. In addition, an allowable range (for example, 1.00 to 0.50) is preset for the light receiving sensitivity and R
When the calculated value of the light receiving sensitivity is stored in the OM3 and becomes equal to or lower than the lower limit value (0.50 in the above example), the correction calculation is not performed and a signal indicating that the correction limit is exceeded is output. Details of this will be described with reference to FIG.

In step S35 of FIG. 8, the sensor control circuit 20 determines whether or not the stain correction of the light-receiving glass 7 is necessary. This is because, for example, when a fire detector is installed in a tunnel or the like, the surface of the light-receiving glass 7 becomes dirty with the exhaust gas of the vehicle with the passage of time, and the light transmittance gradually decreases. Therefore, the external LED 4
L and 4R are used to measure the light transmittances of the left and right portions of the light-receiving glass 7, and the extinction ratio data is set to R.
Store in AM2. The dimming rate data also has an initial value of 1.00 at the time of installation and is updated to 0.95, 0.90, 0.85, etc. when the surface of the light receiving glass 7 becomes dirty.

Therefore, the MPU 1 of FIG. 5 reads out the corresponding left or right extinction ratio data in the RAM 2, for example, 1.
If it is 00, it is determined that the correction is not necessary, and the process proceeds to step S37. If the value is 1.00 or less, it is determined that the correction is necessary, and the average value data in step S32 or step S3.
In step S36, the correction data of 4 is multiplied by a correction value (the reciprocal of the extinction ratio data) to perform a correction calculation. As a result, the average value data or the correction data is free from the influence of stains on the light-receiving glass. The data of the extinction ratio has a lower limit value (for example, 0.
50) is preset and stored in the ROM 4,
When the value is less than or equal to this lower limit value, the correction calculation is not performed and
When the signal indicating that the correction limit has been exceeded is output, or when the pre-set lower limit set to a value slightly higher than the lower limit (for example, 0.6) is reached, a signal indicating that the light-receiving glass needs to be cleaned is output. To output. Details of this will be described with reference to FIG.

Generally, in a two-wavelength radiant fire detector, a light receiving sensor (a photo sensor in this example) that detects a blue light of a flame from a light receiving output of a light receiving sensor (a pyroelectric element in this example) that detects a red light of a flame. The difference value is obtained by subtracting the received light output of the diode), and when the difference value exceeds the threshold value for flame discrimination, it is discriminated as flame. In this embodiment, the MPU 1 executes the step S37 of FIG.
If necessary, subtraction of the photodetection output calculation value of the photodiode from the photodetection output calculation value of the pyroelectric element for each monitoring area, in which the above-mentioned photodetection sensitivity and stain correction calculations have been respectively performed, is calculated. And the next step S3
8, the difference data of the subtraction result is the ROM of FIG.
It is discriminated whether or not the flame discrimination threshold value stored in 6 is exceeded, and flame discrimination is performed.

As the threshold value for flame discrimination, a single threshold value can detect a flame. However, in this embodiment, when it is determined in step S38 that the detected flame is far or near at the same time, the ROM 6 of FIG.
And the second threshold, which is a slightly larger value, are stored. Naturally, the second threshold is a value larger than the first threshold. And step S3
In step S38, the difference data calculated in step 7 is first compared with the first threshold value, and if it exceeds the first threshold value, it is determined to be a flame. Then, the difference data is compared with a second threshold value, and if it exceeds the second threshold value, it is determined that it is a short-distance flame, and if it does not exceed the second threshold value, it is a long-distance flame. Of course, if the difference data does not exceed the first threshold value, it is determined that it is not a flame.

If the result of the determination in step S38 is not flame, the MPU 1 returns to step S32 and returns to step S32.
The processes of 32 to S38 are repeated. When the determination result is flame, in step S39, the transmission control circuit 21 is notified of the flame detection, the transmission control circuit 21 drives the signal transmitting / receiving unit 22, and the receiver detects the flame through the signal transmission line. Send a signal.

When the receiver receives the flame detection signal from the fire detector, the receiver immediately confirms the detection signal, immediately sends a flame accumulation restoration signal to the fire detector, resets the first flame detection signal, and restarts the fire detection signal. Check if the instrument sends the second flame detection signal. When a flame detection signal is transmitted a predetermined number of times (for example, three times) or more continuously from the same fire detector, it is determined that there is a true fire. In this way, false alarms are prevented from occurring.

The reception interrupt routine of the fire detector of FIG. 1 will be described with reference to FIGS. 9 and 10. First, when the receiver selects one of a plurality of fire detectors and issues an operation command to the selected fire detector, information on the address and operation command given in advance for each fire detector Is transmitted via a signal transmission line. 9 and 10 show a routine performed as an interrupt process by the fire detector that receives the address and operation command information transmitted by the receiver.
In the reception interrupt routine of FIG. 9, each fire detector first determines whether or not the received address matches the address given to itself (step S41). If the own address and the received address are different, the process returns from the reception interrupt routine to the main routine.

When the own address and the received address match, the fire detector first determines whether or not the received command is an information request (step S42), and the determined result is YES.
In the case of, the present information of itself is sent to the receiver (step S43). Here, the current information of the fire detector is, for example, whether the flame is currently detected, if detected, how many times the flame is currently detected, or the current light receiving glass 7
Includes a plurality of pieces of information indicating the current state, such as whether the light transmittance is within the allowable range, the light receiving sensitivity of the current light receiving element is within the allowable range, and the like.

If the received command is not an information request, it is then determined whether the received command is a test command (step S4).
4) If the determination result is YES, the fire detector first causes the left and right internal LEDs 3Lb, 3Lr and 3Rb, 3Rr to sequentially emit light, similarly to the process of step S33 of FIG. Photodiode 1L and pyroelectric element 2L and right photodiode 1R and pyroelectric element 2R
Measure the light receiving sensitivity of each. If the measured photosensitivity is less than or equal to the set threshold value (for example, 50% of the reference value), the sensitivity defect is stored, and the test is repeated a plurality of times to continuously determine the number of the sensitivity defects. When the number of times reaches the number of times (for example, three times) or more, it is determined that the photodetector tested for the first time has a failure, and a failure signal of the corresponding photodetector is transmitted to the receiver.

Next, the fire detector operates in step S35 of FIG.
In the same manner as the processing of step 1, the external LEDs 4L and 4R are sequentially made to emit light, the transmittance of light indicating the degree of stain of the light-receiving glass 7 is measured, and the measured transmittance of light is set to a preset threshold value (for example, If it is 50% or less of the reference value, this stain failure is stored, and this test is repeated a plurality of times in the same manner as described above, and the number of stain failures is continuously a predetermined number (for example, 3).
When the number of times above is reached, the receiver is notified that cleaning of the light-receiving glass requires cleaning. After the test process is completed, the process returns to the main routine.

If the received command is not a test command, it is then determined whether it is an inspection start command (step S46). If the determination result is YES, it is further determined whether it is only on the right side, only on the left side, or on both sides ( Step S47), based on this determination result, the right-side light receiving element is inspected by the pseudo flame light source of the inspection tester shown in FIG. 6 (step S48), the left-side light receiving element is inspected (step S50), or the right and left side light-receiving elements are received. Element inspection processing (steps S49 and S50) is performed. Before describing the processing contents of steps S46 to S50, first, the necessity of the inspection start command and the inspection notification signal will be described. FIG. 14 is a diagram showing a plurality of fire detectors installed in a tunnel and a receiver connected via a signal transmission line. As shown in FIG. 14, generally, in a tunnel, a plurality of or a large number of fire detectors are installed so that the respective fire detection areas are slightly overlapped.
Often connected to the receiver via a common signal transmission line.

In FIG. 14, T1 to Tn are fire detectors # 1 to #n, respectively, and it is assumed that 64 fire detectors # 1 to # 64 are currently installed. When maintenance personnel perform inspection tests using the tester, they are not necessarily performed in the order of numbers, and the addresses of fire detectors are not always provided in order due to replacement of devices that occur during use. . Therefore, on the receiver side that receives the flame detection signal from the inspection test, it is necessary to know which fire detector is currently being tested. I was informed about what number of fire detectors I would like to test from now on.

In this embodiment, the fire detector determines whether it is the inspection start command (step S4).
6), the sensor control circuit 20 supplies power to the amplifier 19 and sets it in an operable state. Further, in addition to the pseudo flame light source, the tester is provided with a light emitting element 32 which is a means for generating an inspection notification signal (an optical signal of about 500 Hz in this example).
The optical signal of about 500 Hz is emitted as a signal notifying that the inspection test is currently being performed by the tester.

Then, when the fire detector during the inspection test detects the optical signal of about 500 Hz through the inspection notification signal light receiving element 6 and the amplifier 19, this detection signal together with its own address number is received by the receiver or the repeater. And so on. Therefore, it is unnecessary to communicate with a transceiver or the like, which is conventionally required. Further, since the tester irradiates the fire detector with the optical signal from the pseudo flame light source, if the contamination of the light-receiving glass 7 and the sensitivity of the light-receiving element are within the permissible range and the device is operating normally,
The fire detection signal and the in-inspection signal are transmitted from the corresponding fire detector to the receiver.

Therefore, by simultaneously receiving the flame detection signal and the in-inspection signal, the receiver side knows that the fire detector during the inspection test is operating normally, and if other fire detectors are in use. When only the flame detection signal is received from, it can be known that the corresponding fire detector has detected the actual flame. In this way, the inspection test can be performed while maintaining the flame detection function of all the other fire detectors except the fire detector during the inspection test. When the inspection test process is completed, the fire detector returns to the main routine.

When it is determined in step S46 in FIG. 9 that the command is not the inspection start command, the MPU 1 in the sensor control circuit 20 determines that the operation command received in step S51 in FIG. , The operation / fire indicator lamps 5L and 5R include a green LED of the two-color LEDs) for turning on or off, and if the result of this determination is YES, in step S52,
Whether it is the right operation light or the left operation light is discriminated. In the case of the right side, step S53, and in the case of the left side, step S54.
Then, the operation of turning on or off the operation indicator lamp (flashing) or extinguishing the blinking state is performed. When the lighting or extinguishing operation is completed, the process returns to the main routine.

When it is determined in step S51 of FIG. 10 that the operation indicator lamp is not the lighting or extinguishing instruction, the MPU 1 in the sensor control circuit 20 determines in step S55 that the received operation instruction is the fire indicator lamp (this operation). In the example, it is determined whether the instruction is to turn on or off the red LED of the two-color LED). If the determination result is YES, in step S56, the right fire indicator light or the left fire indicator light is determined. If it is on the right, step S5
7 or in the case of the left side, in step S58, the operation of turning on the fire indicator light continuously or turning off the continuous lighting state is performed. When the lighting or extinguishing operation is completed, the process returns to the main routine.

When it is determined in step S55 of FIG. 10 that the command is not for turning on or off the fire indicator lamp, the MPU 1 in the sensor control circuit 20 determines whether the operation command received in step S59 is a storage recovery command. To determine. Here, the storage restoration command means that when the fire detector first detects a flame and sends this detection signal to the receiver, the receiver that receives this detection signal waits for a while and To reset the fire monitoring data that has been collected and accumulated and collect new data again.
This is a reset command to test whether or not the second flame detection is performed, that is, to prevent the occurrence of a false alarm. If the decision result in the step S59 is YES, it is decided whether it is the right side or the left side (step S60), and if the right side, the step S61, and if the left side, the step S61.
At 62, the above-mentioned storage recovery operation is performed, and then the process returns to the main routine.

When it is determined in step S59 in FIG. 10 that the storage recovery command is not received, the sensor control circuit 20
In step S63, the MPU 1 therein determines whether it is a restoration command. If the determination result is YES, all the data are reset in step S64, and if NO, the process immediately returns to the main routine. Here, resetting all data means resetting the fire monitoring data collected up to that point as well as resetting (that is, turning off) the lighting data of the operation indicator light and the fire indicator light, and turning on the fire detector after the power is turned on. It is to restore to the initial state. After the completion of this restoration process, the process returns to the main routine.

The test operation of the fire detector of FIG. 1 will be described with reference to the flowchart of FIG. In this embodiment, FIG.
The test routine of (1) is started when the power of the fire detector is turned on, a test command from the receiver, or a timer interrupt process. However, in any case, the switch or the like may be used to select whether to start the test routine. In step S71 in FIG. 11, the sensor control circuit 20 determines whether the left or right internal pseudo light source (internal LE
D) Flush 3Lb, 3Lr or 3Rb, 3Rr by flashing. In this case, the pseudo light is made to flash in a flame fluctuation frequency band of about 8 to 12 Hz.

Then, the sensor control circuit 20 makes the photodiode 1L and the pyroelectric element 2L, which are light receiving elements, or the photodiode 1 in a state where the internal pseudo light source is made to emit light.
Each received light data based on the detection signal of R and the pyroelectric element 2L,
The data is sequentially read through the multiplexer and the A / D converter in the I / O interface, and the read data is sequentially stored in the RAM 4. Then, the received light data that has been read in as much as possible is averaged within the time allowed for fire detection, and the averaged data is stored in the RAM 4 as received light output data (step S
72). After the collection of the received light data, the sensor control circuit 20 turns off the internal pseudo light source (step S73),
The ratio of the averaged light receiving data and the light receiving sensitivity reference value stored in advance in the ROM 2 is calculated as the light receiving sensitivity of the corresponding light receiving element, and the calculated value of the light receiving sensitivity is set in advance and stored in the ROM 2. Whether or not the received light data is normal is determined by whether or not the received light sensitivity is within the normal range (for example, 1.00 to 0.85) (step S74).

If the result of the determination in step S74 is normal, it is determined that the correction is not necessary and the process proceeds to step S78. If it is not normal, the process proceeds to step S75. In step S75, whether or not the calculated value of the light receiving sensitivity is not within the normal range but is still within the correctable range is determined as follows. In this embodiment, the permissible range of the light receiving sensitivity is set in advance as 1.00 to 0.50 and stored in the ROM 3. The calculated value of the light receiving sensitivity is the lower limit value of the allowable range (0.
50) Whether or not the received light data can be corrected is determined depending on whether or not the above is satisfied.

Further, in this embodiment, a value (for example, 0.60) slightly higher than the lower limit value (0.50) of the allowable range of the light receiving sensitivity is preset as the front lower limit value, At the step S75, it is also determined at the same time whether the calculated value of the light receiving sensitivity is less than or equal to the front lower limit value.

When it is determined in step S75 that the correction is possible, the sensor control circuit 20 multiplies the received light data by the reciprocal of the calculated received light sensitivity and performs a correction calculation for the sensitivity deterioration to obtain the received light sensitivity. The value of is stored in the RAM 3 (step S76). Then, the process proceeds to step S78. Then, in step S75, if the light-reception sensitivity calculated value is equal to or lower than the lower limit value of the allowable range (0.50 in the above example) and it is determined that the sensitivity correction exceeds the limit and is impossible, the fire detector proceeds to step S75. In S77, the sensitivity abnormality signal of the corresponding light receiving element is transmitted to the receiver. Further, in step S75, a comparison determination is performed with the front lower limit value (0.60 in the above example), and when the light reception sensitivity calculated value is equal to or lower than the front lower limit value,
Similarly, in step S77, the receiver is notified of a notice signal of reception sensitivity deterioration (a signal indicating that it is just before sensitivity deterioration and requires preparation for repair such as arrangement of parts).

The receiver which has received the abnormal signal of the light receiving element from the fire detector repeats the sensitivity test of the same light receiving element of the fire detector, and repeats it for a predetermined number of times (for example, 3 times).
If more than one abnormal signal is returned, the corresponding light receiving element is determined to have failed, and a repair instruction is issued immediately. Also, when the receiver receives the advance notice signal of the deterioration of the light-receiving sensitivity, the operator repeats the confirmation by repeating the operation and prepares for repair after confirmation. The above test is conducted separately from the left test and the right test.

In step S78 of FIG. 11, the sensor control circuit 20 flashes the left or right external pseudo light source (external LED) 4L or 4R for the stain test of the light receiving glass 7. In this case, the light source is made to flush at a frequency range of about 8 to 12 Hz, which is a fluctuation frequency band of a flame at the time of fire.

Then, the sensor control circuit 20 outputs received light data based on the detection signal of the photodiode 1L or 1R, which is a light receiving element, in the multiplexer and A in the I / O interface while the external pseudo light source is emitting light. The data is sequentially read via the / D converter, and the read data is sequentially stored in the RAM 4. Then, the received light data that has been read in as much as possible is averaged within the allowable range of time, and the averaged data is stored in the RAM 4 as received light output data (step S79). In the case of the stain test of the light-receiving glass 7, one light-receiving element is sufficient, and therefore, the light-receiving data of the pyroelectric element is not used in this embodiment.

After the data collection is completed, the sensor control circuit 20 turns off the external pseudo light source (step S80), and calculates the extinction ratio for each of the left side and the right side of the light receiving glass 7 (step S81). The extinction ratio is calculated as a ratio between the averaged received light data and the extinction ratio reference value stored in advance in the ROM 5. In this example,
The allowable range of the extinction ratio is set in advance as 1.00 to 0.50 and stored in the ROM 4. Then, it is determined whether or not the received light data can be corrected depending on whether or not the calculated value of the extinction ratio is equal to or more than the lower limit value (0.50 in the above example) of the allowable range (step S8).
2).

In this embodiment, a value (eg, 0.60) slightly higher than the lower limit (0.50) of the permissible range of the extinction ratio is set in advance as the lower limit. At the same time, in step S82, it is determined whether or not the calculated value of the extinction ratio is less than or equal to the front lower limit value.

When it is determined in step S82 that the correction is possible, the sensor control circuit 20 multiplies the received light data by the reciprocal of the calculated extinction ratio to perform a stain correction calculation. The value of the rate is stored in the RAM 3 (step S83). Then, in step S82, when the calculated extinction ratio value is equal to or lower than the lower limit value (0.50 in the above example) of the allowable range and it is determined that the stain correction exceeds the limit and is impossible, the fire detector determines that In step S84, the stain abnormality signal on the left side or the right side of the light receiving glass 7 is transmitted to the receiver. Further, in step S82, a comparison determination with the front lower limit value (0.60 in the above example) is performed, and when the calculated extinction ratio is equal to or less than the front lower limit value, in step S84, similarly. A notice signal of the stain abnormality (a signal indicating that the stain-absorbing glass 7 needs to be cleaned in the corresponding light-receiving direction immediately before the stain abnormality) is sent to the receiver.

When the receiver receives the stain abnormality signal from the fire detector, the receiver repeats the stain test on the light-receiving glass of the fire detector, and the abnormality signal is returned a predetermined number of times consecutively (for example, 3 times) or more. In this case, the relevant light-receiving glass is judged to have been contaminated and the cleaning instruction is given immediately. Also, when the receiver receives the advance notice signal of the stain abnormality, the operator repeats the confirmation by repeating the operation and issues a cleaning preparation instruction after confirmation. The above test is conducted separately for the left side test and the right side test.

The flame detection operation of the fire detector of FIG. 1 will be described with reference to the flowcharts of FIGS. The flame detection operation based on this flowchart is commonly used in the case of an actually generated flame and in the case of a pseudo flame signal generated from an inspection tester. This will be described in more detail.
In step S91 of FIG. 12, the fire detector performs an initial process. This initial processing is step S in FIG.
The processing is the same as that of 31, such as clearing the RAM data, checking the ROM data sum, storing the initial data for correction of the light receiving element alone, clearing the counter, and waiting for the stabilization time of the amplifier.

Then, it is determined whether the received data matches the address of its own fire detector (step S92),
If they match, the process proceeds to step S101, and if they do not match, the received light output data is read (step S93). Then, the process of obtaining the averaged data of the received light output data read as much as possible within the time allowable range is the same as the process described in step S72 of FIG.

In step S94 of FIG. 12, the sensor control circuit 20 compares the difference data of the two received light outputs with the threshold value for fire determination to determine whether a flame is present, as in the process of step S38 of FIG. It is determined whether or not it is detected. At this time, the received light output is determined after being corrected similarly to the processing of steps S33 to S37 of FIG. Step S
If the flame is not detected in the determination of 94, the sensor control circuit 20 sets the value f of the counter provided in the RAM 6 for counting the number of times of flame detection to 0 and clears the count value of the counter (step S95). ). That is, when the flame detection signal is continuously input, this counter sequentially counts up, but if flame detection is not performed during counting, the count value up to that point is reset to zero. After that, the process returns to step S92.

If flame is detected by the determination in step S94, the sensor control circuit 20 adds 1 to the count value f of the counter up to then (step S96).
It is determined whether the value of the counter f is equal to or larger than a preset number F (for example, 3) (step S97). As a result of this determination, when the value f of the counter is less than the set number F, the process returns to step S92 and the addition of the number of flame detections is repeated.

As a result of the determination in step S97, when the number of times flame detection is continuously performed (the value f of the counter) reaches or exceeds the set number F, the inspection flag is turned on next. It is determined whether or not (step S98), here, it is determined whether a pseudo flame signal is detected (inspection flag is on) or a flame signal due to fire occurrence is detected (inspection flag is off). Then, in the case of detecting the pseudo flame signal, both the flame signal and the inspection signal are set as the transmission information (step S9).
9) If the fire flame signal is detected, only the flame signal is set as the transmission information (step S100), and the process returns to step S92.

The sensor control circuit 20 proceeds to step S101.
Then, it is determined whether the received data is an information request command, and in the case of the information request command, the information preset in the fire detector, for example, the flame detection information set in steps S99 and S100 is sent out. (Step S10
2) Then, the information that has been sent is cleared (step S103). If it is determined in step S101 that it is not an information request command, the sensor control circuit 20 determines whether the received data is an inspection start permission signal (step S
104), if this determination result is YES, the power of the amplifier 19 of FIG. 1 which is the inspection notification signal light receiving circuit is turned on, and the inspection tester outputs the inspection notification signal to its own fire detector. When an optical signal of about 500 Hz is emitted, this emitted light is set to a detectable state (step S105).

When a maintenance worker operates the inspection tester by bringing the inspection tester close to the light receiving glass 7 of the fire detector to be inspected, the optical signal of about 500 Hz emitted from the tester causes the inspection notification signal light receiving element 6 and the amplifier. It is detected via 19 and supplied to the sensor control circuit 20. Upon being supplied with the inspection notification signal, the sensor control circuit 20 immediately activates the inspection notification signal reception interrupt routine shown in the upper right part of FIG. 13, and first, its own fire detector is under inspection test by the tester. So that the receiver can be notified, an inspection notification signal is set as transmission information (step S111), the inspection flag is turned on (step S112), and step S9
Return to 2.

If it is determined in step S104 that it is not the inspection start permission signal, the sensor control circuit 20 determines that
In step S106 of 3, it is determined whether the received data is an inspection end signal to the fire detector of its own. If the result of the determination is YES, the inspection signal light receiving circuit (the amplifier 1 in FIG.
The power of 9) is turned off (step S107). When it is determined in step S106 that the signal is not the inspection end signal, the sensor control circuit 20 determines in step S108 of FIG.
Then, it is determined whether or not the received data is a restoration signal to the fire detector of its own, and if the determination result is YES, as shown in FIG.
The same process as the recovery process described in step S36 is performed, and the process returns to step S92. If the determination result is not the restoration signal, the process directly returns to step S92.

The radiant fire detector in the above-described embodiment determines the extinction rate from the measured value of the detection signal level of the light receiving element and the extinction rate reference value in order to determine the degree of contamination of the translucent cover. Although it is calculated and discriminated, as a reference value for discriminating the degree of contamination of the light receiving element, an allowable range of the degree of contamination corresponding to the measured value is set in advance and stored in, for example, the ROM 5 to detect the light receiving element. The signal level measurement value may be compared with the lower limit value of the contamination degree allowable range for determination. Further, in order to determine the degree of deterioration of the light receiving element, the light receiving sensitivity is calculated and determined from the ratio of the measured value of the detection signal level of the light receiving element and the light receiving sensitivity reference value.
As a reference value for determining the degree of deterioration of the light receiving element, an allowable deterioration range corresponding to the measured value is set in advance, for example, RO
It may be stored in M2, and the measured value of the detection signal level of the light receiving element may be compared with the lower limit value of the allowable deterioration range for determination.

The radiation type fire detector in the above embodiment is
An example of the case of the two-wavelength type in which the magnitude relationship of the radiant energy detected in the two wavelength bands of the radiant light from the flame is compared has been shown, but the present invention is not limited to this and, for example, a single wavelength is used. Even with the constant radiation type that detects the amount of radiant energy in the band, the flicker type that detects flicker peculiar to flames, and the type that uses three or more wavelengths, a light receiving element is placed inside the translucent cover. It can be applied to all the radiant fire detectors provided and can achieve the same effect.

The radiation type fire detector in the above embodiment is
Although an example in which there are two sensing areas on the front left side and the right side with respect to the installation surface is shown, the present invention is not limited to this, and for example, all three-dimensional space in front is a single sensing area. In some cases, even if it is provided in the center of the plaza and has four sensing areas on the front left and right sides and the rear left and right sides, that is, in the case of a radiant fire detector having one or more sensing areas. Also, it is possible to obtain the same effect by applying the present invention.

[0087]

As described above, according to the present invention, a translucent cover for transmitting radiant light emitted from a flame, and a transmitted light from the translucent cover provided inside the translucent cover. A radiation-type fire detector having a light-receiving element for receiving light and a means for detecting a fire based on a detection signal of the light-receiving element, wherein light is emitted from a first test light-emitting element provided outside the translucent cover. It is possible to perform a first operation test as to whether or not the means for detecting the fire operates normally by irradiating the light receiving element through the translucent cover according to the generated first pseudo flame signal. At the same time, the means for illuminating the light receiving element with the second pseudo flame signal emitted from the second test light emitting element provided inside the translucent cover to normally detect the fire. Perform a second operation test whether it operates or not It is now possible to clearly discriminate between the malfunction of the radiation-type fire detector due to the contamination of the translucent cover and the malfunction of the light-receiving circuit including the light-receiving element in the case of malfunction of the radiation-type fire detector. It was

Further, according to the present invention, at the time of the first operation test, light transmission is performed depending on whether or not the detection signal level of the light receiving element is within the allowable range of the degree of contamination, or from the detection signal level of the light receiving element. It is now possible to determine the degree of stain of the translucent cover by calculating the extinction ratio of the light-transmitting cover and determining whether the calculated extinction ratio is within the allowable range.
At the time of the second operation test, the light receiving sensitivity of the light receiving element is calculated based on whether the detection signal level of the light receiving element is within the deterioration allowable range or from the detection signal level of the light receiving element, and the light receiving sensitivity is calculated. Whether or not the sensitivity of the light receiving element is deteriorated can be determined by whether or not the value is within the allowable range.

Further, according to the present invention, a plurality of sensing areas are set in advance as substantially independent three-dimensional spaces, and the radiant light emitted from the flame in each of the set sensing areas is set to the above-mentioned each. A light-transmitting cover for transmitting each direction of the sensing region, and a plurality of light-receiving elements provided inside the light-transmitting cover and receiving the transmitted light of each direction of the light-transmitting cover for each sensing region. And a radiation-type fire detector having means for detecting a fire in each of the plurality of sensing areas based on a detection signal of each of the plurality of light receiving elements, wherein the translucency is provided in each of the plurality of sensing areas. A first pseudo flame signal emitted from each of a plurality of first test light-emitting elements provided outside the cover transmits the light-transmitting cover to separate the light-receiving elements for each of the plurality of sensing regions. To Shines, the means for sensing the fire has become possible to perform the first operation test of whether to operate normally, respectively for each of the plurality of the sensing area,
For each of the plurality of sensing areas, the second pseudo-flame signal emitted from each of the plurality of second test light-emitting elements provided inside the translucent cover causes the plurality of sensing areas to be detected. It is also possible to irradiate the light-receiving elements separately and perform a second operation test whether or not the means for detecting a fire in each of the plurality of detection areas operate normally. In the case of a malfunction of the container, it has become possible to clearly discriminate, for each of the plurality of sensing areas, a malfunction due to the contamination of the translucent cover and a malfunction of the light receiving circuit including the light receiving element.

Further, according to the present invention, during the first operation test, depending on whether or not the detection signal level of the light receiving element is within the contamination degree allowable range for each of the plurality of sensing regions,
Alternatively, the extinction ratio of the translucent cover is calculated from the detection signal level of the light receiving element, and the direction of each of the sensing areas of the translucent cover is determined according to whether the calculated extinction ratio is within an allowable range. In addition to being able to determine whether or not the degree of contamination of the light receiving element is, the detection signal level of the light receiving element is within the deterioration allowable range for each of the plurality of sensing regions during the second operation test. Alternatively, the light receiving sensitivity of the light receiving element is calculated from the detection signal level of the light receiving element, and the degree of sensitivity deterioration of the light receiving element is determined for each of the plurality of sensing regions depending on whether the calculated light receiving sensitivity is within an allowable range. You can now decide whether to accept.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a radiation fire detector showing an embodiment of the present invention.

2 is a configuration diagram of the radiant fire detector of FIG. 1. FIG.

FIG. 3 is a diagram showing left and right sensing areas of the radiant fire detector of FIG.

FIG. 4 is a diagram showing a positional relationship between the light receiving element of FIG. 2 and an internal LED.

5 is a configuration block diagram showing an example of the sensor control circuit of FIG. 1. FIG.

FIG. 6 is an external view of a tester for inspecting a fire detector.

FIG. 7 is a diagram showing a positional relationship between a fire sensor and an inspection tester at the time of inspection.

FIG. 8 is a flowchart showing a main routine of a control program for the radiant fire detector of FIG.

9 is a flowchart showing a first part of a reception interrupt program of the radiant fire detector of FIG. 1. FIG.

10 is a flowchart showing a second part of the reception interrupt program of the radiant fire detector of FIG. 1. FIG.

11 is a flowchart showing a test program for the radiation fire detector of FIG. 1. FIG.

FIG. 12 is a flowchart showing a first part of the flame detection program for the radiant fire detector of FIG. 1.

FIG. 13 is a flowchart showing a second part of the flame detection program for the radiant fire detector of FIG. 1.

FIG. 14 is a diagram showing a plurality of fire detectors installed in a tunnel and a receiver connected via a signal transmission line.

[Explanation of symbols]

 1L, 1R left side, right side photodiode 2L, 2R left side, right side pyroelectric element 3Lb, 3Lr left side inside LED 3Rb, 3Rr right side inside LED 4L, 4R left side, right side outside LED 5L, 5R left side, right side operation / fire indicator light 6 inspection Notification signal light receiving element 7 light receiving glass 8L, 8R left side, right side transparent glass 9A case A 9B case B 11L, 12L left side preamplifier 11R, 12R right side preamplifier 13L, 14L left side amplifier 13R, 14R right side amplifier 15L-18L left side smoothing circuit 15R-18R Right side smoothing circuit 19 Amplifier 20 Sensor control circuit 21 Transmission control circuit 22 Signal transmitting / receiving section 23L, 24L Left side lighting circuit 23R, 24R Right side lighting circuit 25L, 25R Left side, right side lighting control circuit 26, 27 Clock circuit 28, 29 Reset circuit

Claims (6)

[Claims] 1. A light-transmitting cover that transmits radiant light emitted from a flame, a light-receiving element that is provided inside the light-transmitting cover and receives light transmitted from the light-transmitting cover, and the light-receiving element. In the radiation-type fire detector having a means for detecting a fire based on the detection signal of, a first pseudo-flame signal is emitted by the driving of the first operation test means, which is provided outside the translucent cover. A first test light-emitting element that transmits the light-transmitting cover and illuminates the light-receiving element; and a first pseudo-light-emitting element that drives the first test light-emitting element to emit a first pseudo-flame signal. A first operation test means for irradiating and testing whether or not the fire sensing means operates normally based on the detection signal of the light receiving element; and a second operation test means provided inside the translucent cover, A second pseudo flame signal is emitted by driving the operation test means, A second test light emitting element that directly or indirectly irradiates the light receiving element; and a second pseudo light emitting element that drives the second test light emitting element to emit a second pseudo flame signal to irradiate the light receiving element. A radiation type fire detector, comprising: a second operation test means for testing whether or not the means for detecting a fire operates normally based on a detection signal of a light receiving element. 2. The detection signal level of the light receiving element is measured during the test of the first operation test means, and it is determined whether or not the measured value is equal to or more than a lower limit value of a preset allowable contamination degree range. A stain degree determining means including a stain degree determining means for outputting a signal indicating whether or not the degree of stain on the translucent cover is determined according to the determination result; and the light receiving during the test of the second operation test means. The detection signal level of the element is measured, and the measured value is determined whether it is equal to or more than the lower limit value of the deterioration allowable range set in advance,
2. The radiant fire detector according to claim 1, further comprising a light receiving sensitivity testing means including a deterioration degree determining means for outputting a signal indicating whether or not the light receiving element is deteriorated according to the determination result. 3. The detection signal level of the light receiving element is measured during the test of the first operation test means, and the ratio between the measured value and the reference value of the dimming rate is used as the dimming rate of the translucent cover. A light extinction ratio calculating means for calculating, and a calculated value of the light extinction ratio is determined whether or not it is equal to or more than a lower limit value of a preset light extinction ratio allowable range. A pollution level test unit including a pollution level determination unit that outputs a signal indicating whether or not the pollution level is possible, and a detection signal level of the light receiving element is measured during the test of the second operation test unit, and the measured value is obtained. And a reference value of light receiving sensitivity as a light receiving sensitivity of the light receiving element, and whether or not the calculated value of the light receiving sensitivity is equal to or more than a lower limit value of a preset light receiving sensitivity allowable range. Judgment and deterioration of the light receiving element according to the judgment result Radiant fire detector according to claim 1, characterized in that added to the light-receiving sensitivity testing means including a light-receiving sensitivity discriminating means for outputting a signal indicative of the variable or not degrees. 4. A plurality of sensing areas are set in advance as substantially independent three-dimensional spaces, and radiant light emitted from flames in each of the plurality of sensing areas set is divided by the direction of each sensing area. A light-transmitting cover that transmits the light, a plurality of light-receiving elements that are provided inside the light-transmitting cover, and that receive the light transmitted by the direction of the light-transmitting cover for each sensing region, and the plurality of light-receiving elements. A radiation fire detector having means for detecting a fire in each of the plurality of sensing areas based on a detection signal of each light receiving element, wherein each of the plurality of sensing areas is provided outside the translucent cover. The first operation test means drives each of the sensing areas to emit a first pseudo-flame signal, which is transmitted through the light-transmitting cover to irradiate the light-receiving element of each of the sensing areas. A first test light emitting element having, first and the plurality of first test light emitting element is driven individually 1
The pseudo-flame signal is emitted to individually illuminate the light receiving elements of each of the plurality of sensing areas, and the means for detecting a fire in each of the plurality of sensing areas is normally operated based on the detection signal of each of the light receiving elements. First operation test means for testing whether or not each of the plurality of sensing areas operates, and each of the plurality of sensing areas is provided inside the light-transmitting cover, and each of the sensing areas is detected by the second operation testing means. A plurality of second test light-emitting elements that emit second pseudo-flame signals when driven, and directly or indirectly irradiate the light-receiving elements of each of the sensing regions; and a plurality of second test light-emitting elements. The elements are individually driven to the second
The pseudo-flame signal is emitted to individually illuminate the light receiving elements of each of the plurality of sensing areas, and the means for detecting a fire in each of the plurality of sensing areas is normally operated based on the detection signal of each of the light receiving elements. A radiation-type fire detector, comprising: a second operation test means for testing whether or not the operation is performed. 5. The detection signal level of the light receiving element irradiated to each of the plurality of sensing regions is measured during the test of the first operation test means, and each measured value is a preset contamination level. It is determined whether or not each is equal to or more than the lower limit value of the allowable range, and the degree of contamination is output based on the result of the determination, which outputs a signal indicating whether or not the degree of contamination is in each direction of the plurality of sensing areas of the translucent cover. During the test of the pollution degree test means including means and the second operation test means, the detection signal level of the light receiving element irradiated to each of the plurality of sensing regions is measured, and each measured value is set in advance. Deterioration degree determining means for determining whether each is equal to or more than the lower limit value of the allowable deterioration range, and outputting a signal indicating whether or not the degree of deterioration of the light receiving element for each sensing region is possible or not according to the determination result. Radiant fire detector according to claim 4, characterized in that added to the light-receiving sensitivity testing means including. 6. The test signal level of the light receiving element irradiated to each of the plurality of sensing areas is measured during the test of the first operation test means, and the measured value and the extinction rate reference value are compared with each other. A light extinction ratio calculating means for calculating a ratio as a light extinction ratio for each of a plurality of sensing regions of the translucent cover, and a calculated value of the light extinction ratio for each direction is a preset light extinction ratio. It is determined whether or not each is equal to or more than the lower limit value of the allowable range, and the degree of contamination is output based on the result of the determination, which outputs a signal indicating whether or not the degree of contamination is in each direction of the plurality of sensing areas of the translucent cover. And a detection signal level of the light receiving element irradiated to each of the plurality of sensing areas during the test of the second operation testing means, and the measured value and the light receiving sensitivity. The ratio with the reference value is received for each sensing area. Light receiving sensitivity calculating means for calculating the light receiving sensitivity of each child and whether or not the calculated value of the light receiving sensitivity for each sensing area is equal to or more than a lower limit value of a preset light receiving sensitivity allowable range, and the determination is made. 5. The radiation according to claim 4, further comprising a light-reception sensitivity test means including a light-reception sensitivity determination means for outputting a signal indicating whether or not the degree of deterioration of the light-reception element in each of the sensing areas is determined. Fire detector.