JP3240586B2 - Radiant fire detector - Google Patents

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 fire by detecting radiation emitted from a flame, and more particularly to a radiant fire detector having a self-test function using a simulated flame signal.

[0002]

2. Description of the Related Art Conventionally, as a radiation type fire detector, a constant radiation type which detects that radiation energy of a specific wavelength band radiated from a flame reaches a certain amount or more, a flicker which detects flicker peculiar to a flame. There are various types, such as a two-wavelength type and a three-wavelength type, which compare the magnitude of radiation energy in a plurality of wavelength bands, and the like. Many of these radiant fire detectors detect radiant light such as ultraviolet rays and infrared rays emitted from a flame by a light receiving element (for example, a photodiode, a pyroelectric element, a discharge tube, etc.).

Further, a light-transmitting cover made of dust-proof transparent glass or an optical filter is provided on the front surface of the light-receiving element, and radiated light from the flame passes through the light-transmitting cover to reach the light-receiving element. A structure that allows light to be received but blocks the passage of foreign matter, moisture or gas from the outside (for example, an airtight structure)
Many protect the light receiving element and the internal fire detection circuit.

[0004]

However, even if a radiation-type fire detector is provided with a light-transmitting cover having the above-mentioned hermetic structure to protect light-receiving elements such as a pyroelectric element and a photodiode, the light-receiving of these elements can be prevented. It is difficult to maintain the characteristics such as the sensitivity in the initial state for a long period of time, and the sensitivity deteriorates with the passage of time, and sometimes the flame cannot be detected. In addition, after a lapse of time since the installation of the fire detector, the translucent cover is contaminated by the adhesion of dust and the like contained in the outside air, and the light transmittance gradually decreases. Flame detection may not be possible due to the decrease in

[0005] For this reason, some sophisticated fire detectors turn on a simulated flame light source provided outside the translucent cover to determine whether the fire detector normally performs a fire detection operation. Some perform tests. However, in the case where a fire cannot be detected in the operation test, an operation failure due to contamination of the light-transmitting cover causes the fire detection operation to return to normal if the dirt is cleaned, or a failure of the light receiving circuit including the light receiving element, There has been a problem that it is not possible to determine whether the product requires repair by a manufacturer. If the light receiving sensitivity of the light receiving element is reduced during use, the maintenance staff increases the amplification of the amplifier that amplifies the output of the light receiving element or detects a fire so that a fire alarm is not generated. It is necessary to perform a process of reducing the threshold value, and when the number of fire detectors installed is large, there is a problem that much time is required for maintenance work.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a radiation type of detecting a fire by receiving radiation transmitted from a flame by a light receiving element provided inside a translucent cover. When the fire detector is malfunctioning, the malfunction caused by the contamination of the light-transmitting cover and the malfunction of the light-receiving circuit including the light-receiving element are clearly determined, and the light reduction rate of the light-transmitting cover is also determined. Radiation-type fire detection that calculates the light-receiving sensitivity of the light-receiving element and automatically compensates for the contamination of the light-transmitting cover and the light-receiving sensitivity of the light-receiving element according to the calculated values of the dimming rate and the light-receiving sensitivity. The purpose is to obtain a vessel.

[0007]

A radiant fire detector according to the invention of the present application comprises a light-transmitting cover for transmitting radiation emitted from a flame, and a light-transmitting cover provided inside the light-transmitting cover. In a radiation type fire detector having a light receiving element for receiving transmitted light from a cover and a means for detecting a fire based on a detection signal of the light receiving element, a first operation test means provided outside the light transmitting cover. Drives a first pseudo flame signal, emits a first pseudo-flame signal, irradiates a light-receiving element through the light-transmitting cover, and a first pseudo-flame signal by driving the first test light-emitting element. A first operation test unit that emits a flame signal to irradiate the light receiving element; and a test signal level of the light receiving element is measured when the first operation test unit is tested, and the translucent cover is reduced based on the measured value. A dimming rate calculating means for calculating the luminous rate, and a calculated value of the dimming rate is And defacement degree determination means for determining whether or not at least as large as the lower limit of Luo beforehand set dimming rate tolerance, when the discrimination result of the defacement degree determination means is positive,
According to the calculated value of the dimming rate, the degree of amplification of the amplifier that amplifies the output of the light receiving element is changed, or the threshold value for detecting a fire is changed to compensate for the contamination of the light-transmitting cover. and automatic compensation means of contamination and means, automatic fouling
When the compensation by the compensation means has reached or exceeded the limit
That the transmissive cover has reached its limit
Signal or a signal that the limit has been exceeded.
Reporting means .

Further , the radiation type fire detector according to the invention of the present application comprises a transmissive cover for transmitting radiation emitted from a flame, and a transmitted light from the translucent cover provided inside the translucent cover. And a means for detecting a fire based on a detection signal of the light receiving element, provided in the light-transmitting cover, and driven by the second operation test means. A second test light-emitting element that emits a pseudo-flame signal and directly or indirectly irradiates the light-receiving element; and a light-receiving element that drives the second test light-emitting element to emit a second pseudo-flame signal. A second operation test means for irradiating the second operation test means, a light reception sensitivity calculation means for measuring a detection signal level of the light reception element during the test of the second operation test means, and calculating the light reception sensitivity of the light reception element based on the measurement value, The light sensitivity calculation value is set in advance. A light receiving sensitivity determining means for determining whether the light receiving sensitivity is equal to or greater than a lower limit value of the light receiving sensitivity allowable range, and an output of the light receiving element according to the calculated light receiving sensitivity when the result of the light receiving sensitivity determining means is affirmative. whether to change the gain of the amplifier for amplifying, or by changing the threshold for sensing a fire, an automatic compensation means for receiving sensitivity and a light receiving sensitivity compensating means for compensating the deterioration of the receiving sensitivity of the light receiving sensitivity Automatic compensation
When compensation by means has reached or exceeded the limit
A signal indicating that the sensitivity of the photodetector has reached its limit
Or a limit reporter who sends a signal to the outside that the limit has been exceeded
And a step .

[0009]

[0010]

Further , the radiation type fire detector according to the invention of the present application includes a light-transmitting cover for transmitting radiation light radiated from a flame, a light-transmitting cover provided inside the light-transmitting cover, and a light-transmitting cover. In a radiant 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, a radiant fire detector is provided outside the light-transmitting cover, and is driven by the first operation test means. A first test light emitting element that emits a first pseudo flame signal and emits a first pseudo flame signal by illuminating the light receiving element through the translucent cover; and driving the first test light emitting element. A first operation test means for irradiating the light-receiving element and testing whether or not a means for detecting fire based on a detection signal of the light-receiving element operates normally; and a first operation test means provided inside the light-transmitting cover, The second operation test means drives the second
A second test light-emitting element that emits a pseudo-flame signal and directly or indirectly irradiates the light-receiving element; and a light-receiving element that drives the second test light-emitting element to emit a second pseudo-flame signal. A second operation test means for testing whether or not the means for detecting a fire operates normally based on a detection signal of the light receiving element; and detecting the light receiving element during the test of the first operation test means. A light-extinguishing rate calculating means for measuring a signal level and calculating an extinction rate of the light-transmitting cover based on the measured value; and calculating the extinction rate as a lower limit value of a predetermined extinction rate allowable range. First and second contamination degree discriminating means for discriminating whether or not it is above and determining whether or not it is equal to or more than a pre-set lower limit set in advance to a value slightly above the lower limit, If the determination result of the first contamination degree determining means is affirmative, the value corresponding to the calculated value of the dimming rate is used. A contamination compensating means for compensating for the contamination of the light-transmitting cover by changing the amplification degree of the amplifier for amplifying the output of the light receiving element or changing the threshold value for detecting a fire; When the determination result of the determination means is negative, a signal to the effect that cleaning of the translucent cover is required is reported to the outside, and when the determination result of the first contamination degree determination means is negative, the limit of the contamination compensation is set. Automatic contamination compensation and status reporting means including pollution status reporting means for reporting a signal indicating that the signal has been exceeded to the outside, and a detection signal level of the light receiving element is measured at the time of testing the second operation test means, and the measured value is calculated. Light-receiving sensitivity calculating means for calculating the light-receiving sensitivity of the light-receiving element based on the light-receiving sensitivity, determining whether or not the calculated value of the light-receiving sensitivity is equal to or greater than a predetermined lower limit of a light-receiving sensitivity allowable range and slightly more than the lower limit. Preset to the above value First and second light receiving sensitivity determining means for determining whether or not the light receiving sensitivity is equal to or greater than the lower limit value, respectively, and when the determination result of the first light receiving sensitivity determining means is positive, A light-receiving sensitivity compensating means for changing the amplification degree of an amplifier for amplifying the output of the light-receiving element or changing a threshold value for detecting a fire to compensate for the deterioration of the light-receiving sensitivity; If the result of the determination is negative, the advance signal of the light receiving sensitivity deterioration is notified to the outside, and if the result of the determination by the first light receiving sensitivity determining means is negative, a signal indicating that the limit of the light receiving sensitivity compensation has been exceeded is output. It is provided with a light-receiving sensitivity automatic compensation and status notifying means including a light-receiving sensitivity status notifying means for notifying to the outside.

In the radiation type fire detector according to the invention of the present application, a plurality of sensing areas are set in advance as substantially independent three-dimensional spaces, respectively, and the fire is radiated from the flames in the set plurality of sensing areas. And a plurality of light-transmitting covers that are provided inside the light-transmitting cover and receive transmitted light in different directions of the light-transmitting cover for each of the sensing regions. In the radiant fire detector having a light receiving element and a means for detecting a fire in each of a plurality of sensing areas based on a detection signal for each of the plurality of light receiving elements, a translucent cover is provided for each of the plurality of sensing areas. , And emits a first simulated flame signal by driving each sensing area by the first operation test means, and irradiates the light receiving element for each sensing area through the light-transmitting cover. The plurality of first test light emitting elements and the plurality of first test light emitting elements are individually driven to emit a first pseudo flame signal, and the light receiving elements for each of the plurality of sensing regions are individually irradiated. First operation test means for testing whether or not the means for detecting a fire normally operates in each of a plurality of sensing areas based on a detection signal for each light receiving element; and for each of the plurality of sensing areas, It is provided inside the translucent cover,
A plurality of second test light emitting elements for emitting a second pseudo flame signal by driving each sensing area by the second operation test means and for directly or indirectly irradiating a light receiving element for each sensing area, respectively. And individually driving the plurality of second test light emitting elements to emit a second pseudo flame signal, individually irradiating the light receiving elements for each of the plurality of sensing regions, and generating a detection signal for each light receiving element. Second operation test means for testing whether or not the means for detecting a fire operates normally for each of the plurality of sensing areas based on each of the plurality of sensing areas at the time of testing the first operation test means. A dimming rate calculating means for measuring a detection signal level of the light receiving element to be irradiated and calculating a dimming rate for each of a plurality of sensing areas of the translucent cover based on the measured values; The calculated value of the extinction ratio is the preset extinction ratio. A contamination degree discriminating means for discriminating whether or not each is equal to or more than a lower limit value of the tolerance range; and a case where a result of the discrimination of each sensing area by the contamination degree discriminating means is affirmative. Depending on whether the amplification degree of the amplifier that amplifies the output of the light receiving element in this sensing area is changed,
Or, by changing the threshold value for detecting fire, the stain compensation means for compensating for the stain in each sensing area direction of the translucent cover, respectively, and when the determination result of each sensing area by the stain degree determination means is negative. Automatic contamination and limit reporting means including pollution limit reporting means for reporting a signal to the outside that the contamination compensation in the sensing area direction has exceeded the limit; and Measuring the detection signal level of the light receiving element irradiated for each sensing area of
Light-receiving sensitivity calculating means for calculating the light-receiving sensitivity of the light-receiving element for each sensing area based on each measurement value; and a light-receiving sensitivity calculation value for each sensing area being equal to or greater than a predetermined lower limit of the light-receiving sensitivity allowable range. A light-receiving sensitivity determining means for determining whether or not there is a light-receiving element; and a light-receiving element of the corresponding sensing area according to a calculated value of the light-receiving sensitivity of the sensing area when the result of determination of each sensing area by the light receiving sensitivity determining means is positive. A light sensitivity compensating means for changing the degree of amplification of an amplifier for amplifying the output of the light or changing the threshold value for detecting a fire to compensate for the deterioration of the light sensitivity for each of the plurality of sensing areas; and If the judgment result of each sensing area by the judging means is negative, the light sensitivity limit notifying means for notifying the signal that the compensation of the light receiving sensitivity of the sensing area has exceeded the limit to the outside respectively, and the light receiving sensitivity automatic reporting means. It is obtained by a amortization and limitations Problem means.

Further, in the radiation type fire detector according to the present invention, a plurality of sensing areas are set in advance as substantially independent three-dimensional spaces, respectively, and the fire is radiated from the flames in the set plurality of sensing areas. And a plurality of light-transmitting covers that are provided inside the light-transmitting cover and receive transmitted light in different directions of the light-transmitting cover for each of the sensing regions. In the radiant fire detector having a light receiving element and a means for detecting a fire in each of a plurality of sensing areas based on a detection signal for each of the plurality of light receiving elements, a translucent cover is provided for each of the plurality of sensing areas. , And emits a first simulated flame signal by driving each sensing area by the first operation test means, and irradiates the light receiving element for each sensing area through the light-transmitting cover. The plurality of first test light emitting elements and the plurality of first test light emitting elements are individually driven to emit a first pseudo flame signal, and the light receiving elements for each of the plurality of sensing regions are individually irradiated. First operation test means for testing whether or not the means for detecting a fire normally operates in each of a plurality of sensing areas based on a detection signal for each light receiving element; and for each of the plurality of sensing areas, It is provided inside the translucent cover,
A plurality of second test light emitting elements for emitting a second pseudo flame signal by driving each sensing area by the second operation test means and for directly or indirectly irradiating a light receiving element for each sensing area, respectively. And individually driving the plurality of second test light emitting elements to emit a second pseudo flame signal, individually irradiating the light receiving elements for each of the plurality of sensing regions, and generating a detection signal for each light receiving element. Second operation test means for testing whether or not the means for detecting a fire operates normally for each of the plurality of sensing areas based on each of the plurality of sensing areas at the time of testing the first operation test means. A dimming rate calculating means for measuring a detection signal level of the light receiving element to be irradiated and calculating a dimming rate for each of a plurality of sensing areas of the translucent cover based on the measured values; The calculated value of the extinction ratio is the preset extinction ratio. A first and a second determination, respectively, for determining whether the value is equal to or greater than the lower limit of the tolerance range and determining whether the value is equal to or greater than a pre-set lower limit set in advance to a value slightly higher than the lower limit. When the determination result of each of the sensing areas by the stain degree determining means and the first stain degree determining means is affirmative, the output of the light receiving element in the sensing area is changed according to the calculated value of the dimming rate in the sensing area direction. A pollution compensation means for varying the amplification degree of the amplifier to be amplified or changing the threshold value for detecting a fire to compensate for the contamination of the light-transmitting cover in each sensing area direction, and a second degree of contamination. If the determination result of each sensing area by the determination means is negative, a signal indicating that the light-transmitting cover needs to be cleaned in the direction of the sensing area is notified to the outside, and each of the sensing areas determined by the first contamination degree determination means. If the judgment result is negative, Automatic pollution compensation and status reporting means, including pollution status reporting means for reporting a signal to the outside that the pollution compensation in the area has exceeded the limit, and a plurality of sensing means for testing the second operation testing means. Light-receiving sensitivity calculating means for measuring a detection signal level of the light-receiving element irradiated for each area and calculating light-receiving sensitivity of the light-receiving element for each sensing area based on each measured value; and light receiving sensitivity for each sensing area It is determined whether or not the calculated value is equal to or greater than the lower limit of the preset light-receiving sensitivity allowable range and whether or not the calculated value is equal to or greater than the preset lower limit that is slightly higher than the lower limit. When the determination result of each sensing area by the first and second light receiving sensitivity determining means to be performed and the first light receiving sensitivity determining means is affirmative, the corresponding sensing area is calculated in accordance with a calculated value of the light receiving sensitivity of the sensing area. Output of the light receiving element Changing the amplification degree of the amplifier that amplifies the light, or changing the threshold value for detecting a fire, light-receiving sensitivity compensation means that compensates for the deterioration of the light-receiving sensitivity for each of the plurality of sensing areas,
When the result of the determination of each sensing area by the second light receiving sensitivity determining means is negative, a prior signal of the light receiving sensitivity deterioration of the sensing area is reported to the outside, respectively, If the determination result is negative, there is provided a light-receiving sensitivity status notifying means including a light-receiving sensitivity status notifying means for notifying a signal to the outside that the light-receiving sensitivity compensation of the sensing area has exceeded the limit, and a light receiving sensitivity status notifying means. It is.

[0014]

According to the invention of the present application, there is provided a light-transmitting cover for transmitting radiation emitted from a flame, and a light-receiving cover provided inside the light-transmitting cover for receiving light transmitted from the light-transmitting cover. In a radiant fire detector having an element and a means for detecting a fire based on a detection signal of the light receiving element, a first test light emitting element is provided outside the light-transmitting cover, and a first operation is performed. A first pseudo flame signal is emitted by driving the test means, and the light passes through the translucent cover to irradiate the light receiving element. The first operation test means drives the first test light emitting element to emit a first pseudo flame signal to irradiate the light receiving element. The automatic pollution compensation means includes a dimming rate calculation means, a stain degree determination means and a stain compensation means,
The extinction ratio calculation unit measures the detection signal level of the light receiving element during the test of the first operation test unit, and calculates the extinction ratio of the translucent cover based on the measured value. The stain degree determining means determines whether or not the calculated value of the dimming rate is equal to or greater than a lower limit value of a preset dimming rate allowable range. Automatic contamination compensation means, when the determination result of the stain degree determination means is affirmative, according to the calculated value of the dimming rate, change the amplification degree of the amplifier that amplifies the output of the light receiving element, or The threshold value for detecting a fire is changed to compensate for the fouling of the translucent cover. In addition,
Warning means that the automatic compensation for contamination has reached its limit.
Compensation of the translucent cover when it is exceeded or when the limit is exceeded
Signal that the limit has been reached or that the limit has been exceeded
Notify outside.

In the invention according to the present application, a transmissive cover that transmits radiation emitted from a flame, and a light receiving element that is provided inside the translucent cover and receives the transmitted light from the translucent cover And a means for detecting a fire based on the detection signal of the light receiving element, wherein the second test light emitting element is provided inside the translucent cover, and the second operation test is performed. By driving the means, a second pseudo flame signal is emitted to irradiate the light receiving element directly or indirectly. The second operation test means drives the second test light emitting element to emit a second pseudo flame signal to irradiate the light receiving element. The light-receiving sensitivity automatic compensating means includes a light-receiving sensitivity calculating means, a light-receiving sensitivity discriminating means, and a light-receiving sensitivity compensating means. Measure,
The light receiving sensitivity of the light receiving element is calculated based on the measured value. The light-receiving sensitivity determining means determines whether the calculated value of the light-receiving sensitivity is equal to or greater than a lower limit of a predetermined light-receiving sensitivity allowable range. The light-receiving sensitivity compensating means changes an amplification degree of an amplifier for amplifying an output of the light-receiving element or changes a fire in accordance with the calculated value of the light-receiving sensitivity when the result of the light-receiving sensitivity determining means is affirmative. The sensing threshold is changed to compensate for the deterioration of the light receiving sensitivity. Also,
The limit notification means cannot be compensated by the automatic compensation means for the light receiving sensitivity.
When the limit is reached or exceeded, the
A signal indicating that the sensitivity compensation has reached the limit or the limit has been exceeded
A signal to the effect is sent to the outside.

[0016]

[0017]

In the invention according to the present application, a light-transmitting cover that transmits radiation light emitted from a flame, and a light-receiving member that is provided inside the light-transmitting cover and receives light transmitted from the light-transmitting cover. In a radiant fire detector having an element and a means for detecting a fire based on a detection signal of the light receiving element, the first test light emitting element is provided outside the translucent cover, and the first operation is performed. By driving the test means, a first pseudo flame signal is emitted, and the light passes through the translucent cover to irradiate the light receiving element. The first operation test means drives the first test light emitting element to emit a first pseudo flame signal, irradiates the light receiving element, and detects the fire based on a detection signal of the light receiving element. Test whether the means works properly. The second test light emitting element is provided inside the translucent cover, and is driven by the second operation test means.
And irradiates the light receiving element directly or indirectly. The second operation test means drives the second test light emitting element to emit a second pseudo flame signal, irradiates the light receiving element, and detects the fire based on a detection signal of the light receiving element. Test whether the instrument works properly. The automatic pollution compensation and status reporting means includes a dimming rate calculating means, first and second pollution degree discriminating means, a pollution compensating means, and a pollution status reporting means, and the dimming rate calculating means comprises the first operation. During the test of the test means, the detection signal level of the light receiving element is measured, and the extinction ratio of the translucent cover is calculated based on the measured value. The first and second contamination degree determining means determine whether or not the calculated value of the dimming rate is equal to or more than a minimum value of a preset allowable range of the dimming rate, and is slightly larger than the minimum value. It is determined whether or not the value is equal to or more than a pre-set lower limit value set in advance to the above value. The pollution compensating means, when the determination result of the first pollution degree determining means is affirmative, changing an amplification degree of an amplifier for amplifying an output of the light receiving element in accordance with the calculated value of the dimming rate; Alternatively, the threshold value for detecting a fire is changed to compensate for the contamination of the translucent cover. The pollution status reporting means
If the determination result of the second contamination degree determination means is negative, a signal indicating that the light-transmitting cover needs to be cleaned is sent to the outside, and the determination result of the first contamination degree determination means is negative. In such a case, a signal to the effect that the contamination compensation limit has been exceeded is reported to the outside. The light-receiving sensitivity automatic compensation and status notifying means includes a light-receiving sensitivity calculating means, first and second light-receiving sensitivity discriminating means, a light-receiving sensitivity compensating means and a light-receiving status notifying means,
The light receiving sensitivity calculating means measures a detection signal level of the light receiving element at the time of the test of the second operation testing means, and calculates the light receiving sensitivity of the light receiving element based on the measured value. The first and second light-receiving sensitivity determining means determine whether the calculated value of the light-receiving sensitivity is equal to or larger than a predetermined lower limit of a light-receiving sensitivity allowable range, and set a value slightly higher than the lower limit. It is determined whether the value is equal to or greater than a lower prefix set in advance. The light-receiving sensitivity compensating means, when the determination result of the first light-receiving sensitivity determining means is affirmative, changes an amplification degree of an amplifier for amplifying an output of the light-receiving element according to the calculated value of the light-receiving sensitivity, Alternatively, the deterioration of the light receiving sensitivity is compensated by changing a threshold value for detecting a fire. The light-receiving sensitivity status notifying means, when the judgment result of the second light-receiving sensitivity judging means is negative, informs the outside of the advance signal of the light-receiving sensitivity deterioration, and the judgment result of the first light receiving sensitivity judging means is negative. In this case, a signal to the effect that the light receiving sensitivity compensation limit has been exceeded is notified to the outside.

In the invention according to the present application, a plurality of sensing regions are set in advance as substantially independent three-dimensional spaces, respectively, and radiant light radiated from flames in the plurality of set sensing regions, respectively, is set to A light-transmitting cover that transmits light in each direction of each sensing area; and a plurality of light-receiving units that are provided inside the light-transmitting cover and receive light transmitted in the direction of the light-transmitting cover for each sensing area. A radiant fire detector having an element and a means for sensing a fire in each of the plurality of sensing areas based on the detection signals of the plurality of light receiving elements, wherein the plurality of first test light emitting elements are Each of the plurality of sensing regions is provided outside the light-transmitting cover, and emits a first simulated flame signal when driven by the first operation test means for each of the sensing regions. Transmitted to the illuminating 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 form a first
Means for emitting a pseudo flame signal, individually irradiating the light receiving elements for each of the plurality of sensing areas, and means for normally detecting a fire for each of the plurality of sensing areas based on the detection signal for each of the light receiving elements. Test whether it works. The plurality of second test light emitting elements are provided inside the translucent cover for each of the plurality of sensing areas, and the second operation light emitting elements are driven by the second operation test means for each of the sensing areas, respectively. It emits a simulated flame signal and directly or indirectly irradiates the light receiving element for 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 for each of the plurality of sensing regions. Each of the plurality of sensing areas is tested to determine whether or not the fire sensing means operates normally based on the detection signal of each of the light receiving elements. The automatic compensation and limit notification means of the stain includes a dimming rate adding means, a stain degree determining means, a stain compensation means and a stain limit notification means,
The extinction ratio calculating 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 first operation testing means, and based on the measured values, the light transmission rate. The dimming rates are calculated for each of the plurality of sensing area directions of the conductive cover. The stain degree determining means determines whether or not the calculated value of the dimming rate for each direction is equal to or more than a lower limit of a preset dimming rate allowable range. The stain compensating means is an amplifier that amplifies the output of the light receiving element in the corresponding sensing area in accordance with the calculated value of the dimming rate in the corresponding sensing area when the result of the determination of each sensing area by the stain degree determining means is positive. By changing the amplification degree of the light-transmitting cover or by changing the threshold value for detecting the fire, the contamination of the light-transmitting cover in each direction of the sensing area is compensated. The stain limit reporting means, when the determination result of each of the sensing areas by the stain degree determining means is negative, sends a signal to the outside that the pollution compensation in the direction of the corresponding sensing area has exceeded the limit. Automatic compensation of light sensitivity and limit notification means are light sensitivity calculation means,
The light receiving sensitivity calculating means includes a light receiving sensitivity determining means, a light receiving sensitivity compensating means, and a light receiving sensitivity limit notifying means. The light receiving sensitivity calculating means detects a light receiving element irradiated for each of the plurality of sensing regions when the second operation test means tests. The signal level is measured, and the light receiving sensitivity of the light receiving element for each of the sensing areas is calculated based on the measured value. 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 greater than a preset lower limit of the light-receiving sensitivity allowable range. The light-receiving sensitivity compensating means includes an amplifier for amplifying the output of the light-receiving element in the corresponding sensing area according to the calculated value of the light-receiving sensitivity in the corresponding sensing area when the result of the determination of each sensing area by the light receiving sensitivity determining means is positive. The deterioration of the light receiving sensitivity of each of the plurality of sensing regions is compensated by changing the amplification degree or the threshold value for detecting a fire. The light-receiving sensitivity limit reporting means, when the determination result of each of the sensing areas by the light-receiving sensitivity determining means is negative, sends a signal to the outside that the compensation of the light-receiving sensitivity of the corresponding sensing area has exceeded the limit.

In the invention according to the present application, a plurality of sensing regions are set in advance as substantially independent three-dimensional spaces, respectively, and the radiated light radiated from the flame in each of the set plurality of sensing regions is defined by the aforementioned A light-transmitting cover that transmits light in each direction of each sensing area; and a plurality of light-receiving units that are provided inside the light-transmitting cover and receive light transmitted in the direction of the light-transmitting cover for each sensing area. A radiant fire detector having an element and a means for detecting a fire in each of the plurality of sensing areas based on the detection signals of the plurality of light receiving elements, wherein the plurality of first test light emitting elements are Each of the plurality of sensing regions is provided outside the light-transmitting cover, and emits a first simulated flame signal when driven by the first operation test means for each of the sensing regions. Transmitted to the illuminating 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 form a first
Means for emitting a pseudo flame signal, individually irradiating the light receiving elements for each of the plurality of sensing areas, and means for normally detecting a fire for each of the plurality of sensing areas based on the detection signal for each of the light receiving elements. Test whether it works. The plurality of second test light emitting elements are provided inside the translucent cover for each of the plurality of sensing areas, and the second operation light emitting elements are driven by the second operation test means for each of the sensing areas, respectively. It emits a simulated flame signal and directly or indirectly irradiates the light receiving element for 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 for each of the plurality of sensing regions. Each of the plurality of sensing areas is tested to determine whether or not the fire sensing means operates normally based on the detection signal of each of the light receiving elements. The automatic pollution compensation and status reporting means includes a dimming rate calculating means, first and second pollution degree discriminating means, a pollution compensating means, and a pollution status reporting means, and the dimming rate calculating means comprises the first operation. During the test of the test means, the detection signal level of the light receiving element irradiated to each of the plurality of sensing areas is measured, and the reduction of the light transmitting cover in each of the plurality of sensing area directions is performed based on the measured values. Calculate the luminous index respectively. The first and second contamination degree determining means determine whether or not the calculated value of the dimming rate in each of the directions is equal to or greater than a minimum value of a preset allowable dimming rate range and the minimum value. A determination is made as to whether or not the value is equal to or greater than a preset lower limit value slightly higher than the value. The stain compensating means, when the determination result of each sensing area by the first stain degree judging means is affirmative, outputs the output of the light receiving element of the corresponding sensing area in accordance with the calculated value of the dimming rate in the corresponding sensing area. The degree of amplification of the amplifier to be amplified or the threshold value for detecting a fire is changed to compensate for contamination of the translucent cover in each sensing area direction. The fouling status reporting means reports to the outside a signal indicating that cleaning of the translucent cover in the direction of the pertinent sensing area is required when the result of the determination of each sensing area by the second fouling degree determining means is negative. If the result of the judgment of each sensing area by the first stain degree judging means is negative, a signal indicating that the stain compensation in the direction of the corresponding sensing area has exceeded the limit is notified to the outside. The automatic light receiving sensitivity compensation and status reporting means includes a light receiving sensitivity calculating means, first and second light receiving sensitivity discriminating means, a light receiving sensitivity compensating means and a light receiving sensitivity status reporting means, and the light receiving sensitivity calculating means is the second light receiving sensitivity calculating means. During the test of the operation test means, the detection signal levels of the light receiving elements irradiated to each of the plurality of sensing areas are respectively measured, and the light receiving sensitivity of the light receiving elements for each of the sensing areas is calculated based on the measured values. I do. The first and second light-receiving sensitivity determining means determine whether or not the calculated value of the light-receiving sensitivity for each of the sensing areas is equal to or more than a minimum value of a preset light-receiving sensitivity allowable range, and It is determined whether each value is equal to or higher than a lower limit set in advance to a slightly higher value. The light receiving sensitivity compensating means, when the result of determination of each sensing area by the first light receiving sensitivity determining means is affirmative,
According to the calculated value of the light receiving sensitivity of the corresponding sensing area, change the amplification degree of the amplifier that amplifies the output of the light receiving element of the corresponding sensing area, or change the threshold value for detecting fire,
The deterioration of the light receiving sensitivity for each of the plurality of sensing regions is compensated.
The light-receiving sensitivity status notifying means, when the result of the determination of each sensing area by the second light-receiving sensitivity determining means is negative, notifies each of the prior signals of light-receiving sensitivity deterioration of the corresponding sensing area to the outside, and If the result of the determination of each sensing area by the light receiving sensitivity determining means is negative, a signal to the effect that the light sensitivity compensation of the corresponding sensing area has exceeded the limit is notified to the outside.

[0021]

FIG. 1 is a block diagram showing the construction of a radiant fire detector according to an embodiment of the present invention. FIG. 2 is a structural view of the radiant fire detector of FIG. 1, and FIG.
(B) shows a sectional view thereof. FIG. 3 is a view showing two sensing areas on the left and right sides of the radiant fire detector of FIG. 1, and FIG.
It is a figure which shows the positional relationship with D).

First, it will be described that a single fire detector can have a plurality of sensing areas. When the radiant fire detector of the embodiment of FIG. 1 is installed, for example, on a wall, the center axes of the radiant fire detector are 45 degrees left and right with respect to the front direction of the fire detector (direction perpendicular to the wall). It has two almost independent three-dimensional space fire sensing areas. FIG. 3 shows 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.
Radiation light radiated from the flames in the left and right sensing regions in FIG. 3 is received by the light-receiving elements arranged such that the light-receiving directional characteristics in each direction match the sensing regions.

In FIGS. 1 to 4, 1L and 1R denote blue light components (for example, having a wavelength of 0.6 to 0.7) of infrared light radiated from a flame generated in the left and right sensing regions, respectively.
This is a blue light receiving element that separately receives a component of about 5 μ, 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) of infrared light radiated from the same flame generated in the left and right sensing areas, respectively. In this embodiment, a pyroelectric element (an element that generates a voltage or a pyroelectric current when absorbing infrared rays and causing a temperature change) is used. The photodiode 1L and the pyroelectric element 2L serve as light receiving sensors in the left sensing area of FIG. 3, and the photodiode 1R and the pyroelectric element 2R serve as light receiving sensors in the right sensing area of FIG. 3, respectively. The light component is detected separately.

3Lb and 3Lr are the left blue light receiving photodiodes 1 when the light receiving sensitivity test is performed.
L and the red light receiving pyroelectric element 2L on the left side are separately illuminated, so that the second light for the left side emits red light in the same band as the flame by flashing at about 8 to 12 Hz which is the fluctuation frequency of the flame.
In this embodiment, a light-emitting diode is used and is provided inside the light receiving glass 7, and is hereinafter referred to as a left internal LED. Similarly, 3Rb, 3Rr
Indicates that when performing the light receiving sensitivity test, the red light of the same band as the flame that separately irradiates the right blue light receiving photodiode 1R and the right red light receiving pyroelectric element 2R blinks at about 8 to 12 Hz. This is a second test light emitting element for the right side that emits light. In this embodiment, a light emitting diode is used and is provided inside the light receiving glass 7, and is hereinafter referred to as a right internal LED. The left or right internal LED3
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 such that direct irradiation is performed in this embodiment, as shown in FIG. ing. Instead of direct irradiation, the inner surface of the light receiving glass 7 or the photodiode 1
The light may be reflected by the inner surface of an optical filter provided on the front surface of the L, 1R and the pyroelectric elements 2L, 2R for irradiation, that is, indirect irradiation .

4L and 4R are provided outside the light receiving glass 7 to test the degree of contamination (specifically, light transmittance) of the light transmitting portions on the left and right sides of the light receiving glass 7, respectively. Red light in the same band as
Hz is a first test light emitting element for the left side and the right side for flashing at Hz, and emits pseudo-flame light emitted from the left or right direction to the light receiving glass 7 at the time of the test for the degree of contamination. The light is transmitted, and the left photodiode 1L and the right photodiode 1R inside thereof are separately irradiated. In this embodiment, a light emitting diode is used as a light emitting element, and will be referred to as left and right external LEDs hereinafter.

Reference numerals 5L and 5R denote operation / fire indicators on the left and right sides, 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 of the two-color LED is performed based on the instruction of the receiver that the fire detector transmits a flame detection signal to the receiver and receives the flame detection signal. Is detected, the flashing lighting by the green LED is performed. When the second flame after the first detection signal is stored and restored (reset) by the receiver is detected, the flashing lighting by the red LED is performed. Then, after three or more consecutive flame detection signals are confirmed by the receiver, continuous lighting by the red LED is performed. In addition to the above three display states, the display mode of the two-color LED can be increased by combining flashing lighting (in some cases, the blinking frequency is low or high), continuous lighting or extinguishing for each of the two LEDs. Display modes are possible. Table 1 below shows an example of the display mode.

[0027]

[Table 1]

In this embodiment, when the fire detector receives the light emitted from the simulated flame light source of the inspection tester and performs an inspection test, it is determined that the inspection test is being performed by the tester. In order to inform the tester, light modulated at a frequency different from the frequency band included in the flame from the inspection notification signal generation means provided in advance in the tester,
For example, it generates light that blinks at about 500 Hz. Reference numeral 6 denotes a light receiving element for receiving the inspection notification signal generated from the tester, and in this example, a photodiode for receiving the light blinking at about 500 Hz. The inspection tester will be described with reference to FIGS. Numeral 7 denotes a light-receiving glass as a light-transmitting cover, which transmits a flame signal at the time of a fire through the light-receiving glass 7 to be received by the photodiodes 1L and 1R and the pyroelectric elements 2L and 2R. 8L and 8R are the left external LED 4L and the operation / fire indicator 5L, respectively.
And transparent glass provided on the right external LED 4R and the operation / fire indicator 5R. 9A and 9B are a case A and a case B of the fire detector, respectively.

In FIG. 1, 11L and 11R are preamplifiers for amplifying the light receiving output signals of the photodiodes 1L and 1R, respectively, and 12L and 12R are the pyroelectric elements 2L and 2R, respectively.
Preamplifiers 13L and 13 for amplifying the received light output signal of
R, 14L and 14R are preamplifiers 11L and 11R, respectively.
An amplifier that amplifies output signals of R, 12L, and 12R. Here, the preamplifiers 11L, 11R, 12L, 1
The 2R and the amplifiers 13L, 13R, 14L, and 14R amplify only the true flame signal of the output signals obtained from the respective light receiving elements. 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, and attenuates the DC component and the high-frequency component of about 12 Hz or more in the input signal, and amplifies only the narrow-band signal.

The preamplifier 11L and the amplifier 13L, 1
Since the two-stage amplifier circuit composed of 2L and 14L, 11R and 13R, or 12R and 14R has high gain and high sensitivity, sufficient measurement values can be obtained even in a distant or small-scale fire where the radiant light energy of the fire is small. Is used as a circuit to obtain Since the amplifier circuit including only the preamplifiers 11L, 12L, 11R or 12R has low gain and low sensitivity, the output of the amplifier circuit does not saturate even in a large scale where the radiant light energy of fire is large, and the correct measurement value is obtained. Is used as a circuit to obtain 15L ~ 18L and 15R ~
Reference numeral 18R denotes a smoothing circuit, which includes, for example, a resistor and a capacitor, receives an output signal of the preamplifier or the amplifier, outputs a smoothed signal of the input signal, and supplies the 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 where the light receiving signal level is between the minute level and the saturation level is measured. Reference numeral 19 denotes an amplifier for amplifying the output signal of the inspection notification signal light receiving element 6, but is not always operable. When the fire detector receives an inspection start permission signal from an external receiver or a repeater, a sensor control is performed. The amplifier is set by the circuit 20 from an inoperable state to an operable state.

Reference numeral 20 denotes a sensor control circuit, and reference numeral 21 denotes a transmission control circuit. It is built-in.

FIG. 5 is a block diagram showing an example of the sensor control circuit of FIG. In FIG. 5, MPU1 and R
The OM1 to ROM9, the RAM1 to RAM6, and the I / O interface are mutually connected via a data bus and an address bus. In this embodiment, RO
M1 is a storage area of a control program, ROM2 is a storage area of a normal range reference value of a light-receiving output signal obtained via a light-receiving element and an amplifier, ROM3 is a storage area of a correctable range threshold value of a single light-receiving element, and ROM4 is a light-receiving element. ROM 5 is a storage area for the reference value of the dimming rate, ROM 6 is a storage area for the threshold value for fire determination, and RO is a storage area for the dirt correction range of the received light output signal obtained through the element and the amplifier.
M7 is a storage area for address codes and type codes assigned to each fire sensor for identifying a plurality of fire sensors, and ROM 8 is a read-only memory assigned to each of the other auxiliary storage areas.

A RAM 1 is a work area for data, a RAM
2 is an area for storing light attenuation data, RAM3 is an area for storing a light-receiving sensitivity calculated value of a single light-receiving element, RAM4 is an area for storing a light-receiving output value from a light-receiving sensor, RAM5 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
An A / D converter, a multiplexer, an output port, an input port and the like are included therein. This multiplexer selects an analog input signal from the smoothing circuits 15L to 18L, 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 and enables digital signal processing in the sensor control circuit. The output port outputs, for example, a lighting control signal to a lighting circuit, and the input port receives, for example, data from the transmission control circuit 21. The I / O interface includes preamplifiers 11L, 11R, 12L, 12R and an amplifier 1
Output ports and the like for controlling the degree of amplification of 3L, 13R, 14L, and 14R are also provided, but are not shown.

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

Reference numerals 25L and 25R denote operation / fire indicators 5 based on output signals from the sensor control circuit 20, respectively.
This is a lighting control circuit that controls lighting (including continuous lighting and flashing lighting) of L and 5R. Reference numerals 26 and 27 denote clock circuits, which generate respective clock signals and supply them to the sensor control circuit 20 and the transmission control circuit 21. Reset circuits 28 and 29 both generate reset signals by an initial operation after power-on or manual operation, and supply the reset signals to the sensor control circuit 20 and the transmission control circuit 21.

FIG. 6 is an external view of a fire detector inspection tester, in which (a) shows a side view and (b) shows a front view. In FIG. 6, 31L and 31R are light-emitting elements (for example, light-emitting diodes) that emit light as pseudo-flame signals on the left and right sides, respectively, at a flame fluctuation frequency of about 8 to 12 Hz in the infrared light band of the flame. . Also, 32 is an inspection notification signal for the purpose of notifying the relevant fire sensor that an inspection test is being performed while a certain fire sensor is being inspected by the inspection tester, and a frequency higher than the flame fluctuation frequency ( In this embodiment, about 500H
The light-emitting element emits light in z). As shown in FIG. 6A, the inspection tester is provided with a switch for selecting one of three positions, left (L), right (R), and both left and right (center position). , 8 to 12 Hz light emitting element 31L or 31R, or both, can be selected to emit light. In the following example, a case will be described where an inspection test is performed on each of the left (L) and right (R) sides.

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 the front surface of the tester is put on the light receiving glass 7 of the fire detector. As a result, the light emitted from the 8-12 Hz light emitting element 31L or 31R 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 MPU 1, ROM 1 and ROM 6 of the sensor control circuit 20 are an example of a fire detecting means, the external LEDs 4L and 4R are examples of a 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 unit. In addition, internal LE
D3Lb, 3Lr, 3Rb, and 3Rr are examples of the second test light emitting element, and MPU1 and R3 of the sensor control circuit 20
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 examples of the degree of contamination determination means, and the MPU1, ROM1, RO
M2 and ROM3 are examples of the light receiving sensitivity determining means. Further, the MPU 1, ROM 1 and ROM of the sensor control circuit 20
5 is an example of the dimming rate calculation means, and MPU1, R
The OM 1 and the ROM 2 are an example of a light receiving sensitivity calculating unit.

The MPU 1 and R of the sensor control circuit 20
OM1, POM4, and ROM5 are examples of the stain compensating means, and MPU1, ROM1, ROM2, and ROM3 are also examples of the light-receiving sensitivity compensating means. Also, the transmission control circuit 2
The transmission control circuit 21 and the signal transmission / reception unit 22 are examples of contamination or light-receiving sensitivity status reporting means.

FIG. 8 is a flowchart showing a main routine of a control program for the radiation type fire detector of FIG.
FIGS. 9 and 10 are flowcharts showing the first and second reception interrupt programs of the radiant fire detector of FIG. FIG. 11 is a flowchart showing a test program for the radiant fire detector of FIG. 12 and 13 are flowcharts showing the first and second programs of the flame detection program of the radiation type fire detector of FIG. FIG. 8 to FIG.
The operation of the fire detector of FIGS. 1 and 4 will be described with reference to FIG.

In step S31 in FIG. 8, the fire detector performs an initial process after turning on the power. This initial processing includes, for example, clearing of the 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. ) Operation such as standby.

In step S32 of FIG. 8, the sensor control circuit 20 in the fire detector uses the I / O interface of FIG. 5 to convert the output signal of each light receiving sensor into a smoothing circuit 15L.
To 18L and 15R to 18R, quantize the values and store them in the RAM 4. The I / O interface sequentially selects one signal from eight input signals output from each of the smoothing circuits by a built-in multiplexer based on a command from the MPU 1 and converts the selected signal into an A / O signal.
Quantized by the D converter, and the quantized data is sequentially RA
The data is stored in M4, and an operation of calculating an average value of the plurality of stored data is performed to obtain final fire monitoring data.

The sampling frequency of the data via the A / D converter is preferably set to a frequency twice or more 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 desirably 0.04 seconds or less. In addition, in calculating the average value of the plurality of sampled data, the number of sample data is desirably as large as possible in order to eliminate the influence of the maximum value and the minimum value of the sample data and to provide an integral function. However, the time allowed from the occurrence of a flame to the detection of a fire is generally restricted, so that within the time restrictions, each of the left and right sensing areas is allowed for each of the long wavelength and short wavelength light receiving sensors. As many sample data as possible are collected, the average value of the collected data is calculated, and this value is used as fire monitoring data for each wavelength range.

When the output level of the light-receiving sensor is high, the signal that has passed through the smoothing circuit from the amplifier has a saturation level. The signal level in the area is measured.

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

The calculated value of the light receiving sensitivity is 1.00 as an initial value at the time of installation.
5, 0.90, 0.85, etc. Therefore, FIG.
MPU 1 reads out the light-receiving sensitivity calculation value of the corresponding light-receiving sensor in RAM 3 and reads the value in the normal range (for example, 1.00 to 0.8).
5) is determined, and if it is within the normal range stored in the ROM 2, it is determined that correction is not necessary, and step S
35, it is determined that correction is necessary when the value is equal to or lower than the lower limit value of the normal range. In step S34, a correction value (the reciprocal of the light receiving sensitivity; 1 / 0.6) to perform a correction operation. As a result, the influence of the decrease in the light receiving sensitivity of the fire monitoring data is removed. Note that an allowable range (for example, 1.00 to 0.50) is set in advance for the light receiving sensitivity and R
When the calculated value of the light receiving sensitivity is equal to or less than the lower limit (0.50 in the above example), a signal indicating that the correction limit has been exceeded is output without performing the correction calculation. This will be described in detail with reference to FIG.

In step S35 of FIG. 8, the sensor control circuit 20 determines whether or not it is necessary to correct the light receiving glass 7 for contamination. This is because, for example, when the fire detector is installed in a tunnel or the like, the surface of the light receiving glass 7 is stained with the exhaust gas of the vehicle over time, and the light transmittance gradually decreases. Therefore, the external LED 4
Using L and 4R, the light transmittances of the left and right portions of the light receiving glass 7 are measured, and the extinction ratio data is calculated as R
It is stored in AM2. The extinction rate data is also updated to 0.95, 0.90, 0.85, etc. when the initial value at the time of installation is 1.00 and the surface of the light receiving glass 7 becomes dirty.

Therefore, the MPU 1 shown in FIG. 5 reads out the corresponding left or right dimming rate data in the RAM 2, for example, as follows.
If it is 00, it is determined that the correction is unnecessary, and the process proceeds to step S37. If the value is 1.00 or less, it is determined that the correction is necessary.
In step S36, the correction data of No. 4 is multiplied by a correction value (the reciprocal of the dimming rate data) to perform a correction operation. As a result, the average value data or the correction data is free from the influence of the contamination of the light receiving glass. Note that the data of the dimming rate includes a lower limit value of an allowable range (for example, 0.
50) is set in advance and stored in the ROM 4,
When the value is equal to or less than the lower limit, the correction calculation is not performed,
When a signal indicating that the limit of the correction has been exceeded is output, or when the lower limit value is set to a value slightly higher than the lower limit value (for example, 0.6), a signal indicating that the light receiving glass needs to be cleaned is output. Output. The details will be described with reference to FIG.

In general, in a two-wavelength radiant fire detector, a light-receiving sensor (in this example, a photodetector) that detects blue light of a flame from a light-receiving output of a light-receiving sensor (in this example, a pyroelectric element) that detects red light of the flame. A difference value is obtained by subtracting the light receiving output of the diode), and when the difference value exceeds a flame determination threshold value, it is determined that a flame has occurred. In this embodiment, the MPU 1 determines in step S37 of FIG.
The light receiving output calculation value of the photodiode is subtracted from the light receiving output calculation value of the pyroelectric element for each monitoring area in which the light receiving sensitivity and the dirt correction calculation are performed in advance, respectively, as needed, and the difference data is calculated. And the next step S3
8, the difference data of the subtraction result is stored in the ROM of FIG.
Then, it is determined whether or not a value exceeds a flame discrimination threshold value stored in advance in 6, and flame discrimination is performed.

The flame can be detected with a single threshold as the flame determination threshold. However, in this embodiment, when the flame determination is performed in step S38 so that it is possible to simultaneously determine whether the detected flame is far or near, the first value, which is a slightly smaller value, is stored in the ROM 6 of FIG.
And a second threshold value, which is a slightly larger value, are stored. Of course, the second threshold is a value larger than the first threshold. And the step S3
In step S38, the difference data calculated in step 7 is compared with the first threshold value. If the difference value exceeds the first threshold value, it is determined that the flame is present. Then, the difference data is compared with a second threshold value. If the difference value exceeds the second threshold value, it is determined that the flame is a short-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 a flame, the MPU 1 returns to step S32 and returns to step S32.
The processes of 32-32 are repeated. If the determination result is a flame, in step S39, the transmission control circuit 21 is notified of the flame detection, and the transmission control circuit 21 drives the signal transmission / reception unit 22 and sends the flame detection signal to the receiver via the signal transmission line. Send a signal.

Upon receiving the flame detection signal from the fire detector, the receiver, upon confirming the detection signal, immediately transmits a flame accumulation restoration signal to the fire detector, resets the first flame detection signal, and detects the fire again. Check if the vessel sends a second flame detection signal. Then, when the same fire sensor continuously transmits a predetermined number of times (for example, three times) of flame detection signals, it is determined that the fire is a true fire. In this way, the occurrence of a false alarm is prevented.

The reception interrupt routine of the fire detector shown in FIG. 1 will be described with reference to FIGS. 9 and 10. First, when the receiver selects one of the plurality of fire detectors and issues an operation command to the selected fire detector, information on the address and operation command previously assigned to each fire detector is given. Is transmitted via the signal transmission line. FIG. 9 and FIG. 10 show a routine that is performed as an interrupt process by the fire detector that has received the address and the operation command information transmitted by the receiver.
In the reception interrupt routine of FIG. 9, each fire detector first determines whether the received address matches the address assigned to itself (step S41). If the own address is different from the reception address, 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 the reception command is an information request (step S42), and the determination result is YES.
In the case of (1), the current information is transmitted to the receiver (step S43). Here, the current information of the fire detector means, for example, whether a flame is currently detected, if it is detected, how many times it is detected, the current light receiving glass 7.
Include a plurality of pieces of information indicating the current state, such as whether the light transmittance is within the allowable range and whether the light receiving sensitivity of the current light receiving element is within the allowable range.

If the reception command is not an information request, it is next determined whether the reception command is a test command (step S4).
4) If the determination result is YES, the fire detector first makes the left and right internal LEDs 3Lb, 3Lr and 3Rb, 3Rr emit light in order, similarly to the processing of step S33 in FIG. Photodiode 1L and pyroelectric element 2L, and right photodiode 1R and pyroelectric element 2R
Are measured respectively. If the measured light receiving sensitivity is equal to or less than a set threshold value (for example, 50% of the reference value), the sensitivity failure is stored, and this test is repeated a plurality of times, so that the number of the sensitivity failures is continuously determined by a predetermined number. When the number reaches the number of times (for example, three times) or more, it is determined that the light receiving element tested for the first time has a failure, and a failure signal of the light receiving element is transmitted to the receiver.

Next, the fire detector performs step S35 in FIG.
Similarly, the external LEDs 4L and 4R are caused to emit light in order, and the transmittance of light indicating the degree of contamination of the light receiving glass 7 is measured. The measured transmittance of light is set to a predetermined threshold value (for example, If it is 50% or less of the reference value, this contamination failure is stored, and this test is repeated a plurality of times in the same manner as described above.
Times) or more, the receiver is notified of the need to clean the light receiving glass. Then, after the end of the test processing, the process returns to the main routine.

If the received command is not a test command, it is next determined whether the received command is an inspection start command (step S46). If the result of the determination is YES, it is further determined whether only the right side, only the left side, or both the left and right sides ( Step S47), based on the result of this determination, the inspection processing of the right light receiving element (step S48), the inspection processing of the left light receiving element (step S50), or the light reception of the right and left sides using the simulated flame light source of the inspection tester shown in FIG. An element inspection process (steps S49 and S50) is performed. Before describing the processing contents of steps S46 to S50, first, the necessity of an inspection start command and an 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 or a large number of fire detectors are installed so that respective fire detection areas slightly overlap each other.
It is often connected to a receiver via a common signal transmission line.

In FIG. 14, T1 to Tn are # 1 to #n fire detectors, respectively, and it is assumed that 64 fire detectors # 1 to # 64 are installed. When a maintenance person performs an inspection test using the tester, the test is not always performed in the order of the numbers, and the addresses of the fire detectors are not necessarily provided in order due to replacement of equipment that occurs during use. . Therefore, it is necessary for the receiver that receives the flame detection signal from the inspection test to know what fire detector is currently being tested. In this way, I was informed of what fire detector to test.

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 to set it in an operable state. The tester is provided with a light emitting element 32 which is an inspection notice signal (light signal of about 500 Hz in this example), which is separate from the simulated flame light source.
The optical signal of about 500 Hz is emitted as a signal for notifying that the test is currently being performed by the tester.

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, the detection signal is transmitted to the receiver or the repeater together with its own address number. And so on. Therefore, communication of a transceiver or the like which has been required conventionally becomes unnecessary. Further, since the tester irradiates the fire detector with an optical signal from the simulated flame light source, if the contamination of the light receiving glass 7 and the sensitivity of the light receiving element are within the allowable range and the device is operating normally,
The fire detector transmits a flame detection signal and a signal under inspection to the receiver.

Therefore, by receiving the flame detection signal and the signal under inspection at the same time, the receiver knows that the fire detector during the inspection test has been operated normally, and if the other fire detector When only the flame detection signal is received from the CPU, it is possible to know that the corresponding fire detector has detected the actual flame. As described above, the inspection test can be performed while maintaining the flame detection function of all the other fire sensors except the fire sensor under the inspection test. When the inspection test is completed, the fire detector returns to the main routine.

If it is determined in step S46 in FIG. 9 that the received command is not an inspection start command, the MPU 1 in the sensor control circuit 20 determines in step S51 in FIG. It is determined whether it is a command to turn on or off the green LED of the two-color LEDs included in the operation / fire indicator lights 5L and 5R.
It is determined whether the operation light is on the right side or the operation light on the left side.
Then, an operation of turning on / off the operation indicator lamp (flashing) or turning off the blinking state is performed. When the above lighting or extinguishing operation is completed, the process returns to the main routine.

If it is determined in step S51 of FIG. 10 that the command is not a command to turn on or off the operation indicator, the MPU 1 in the sensor control circuit 20 determines in step S55 that the received command is a fire indicator (this embodiment). 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 lamp or the left fire indicator lamp is determined. And if it is on the right, step S5
7, and in the case of the left side, in step S58, an operation is performed to turn on or off the fire indicator lamps respectively. When the above lighting or extinguishing operation is completed, the process returns to the main routine.

If it is determined in step S55 in FIG. 10 that the fire indicator is not turned on or off, the MPU 1 in the sensor control circuit 20 determines in step S59 whether the received operation command is a storage restoration command. Is determined. Here, the accumulation restoration command means that the fire detector first detects the flame and sends this detection signal to the receiver, and the receiver that receives this detection signal sends the detection signal to the relevant fire detector after a while. To reset the fire monitoring data collected and accumulated until then, collect new data again,
This is a reset command to test whether or not the second flame detection is performed, that is, to prevent occurrence of a false alarm. If the determination result in the step S59 is YES, it is determined whether the right side or the left side (step S60).
At 62, the above-described operation of accumulation recovery is performed, and thereafter, the process returns to the main routine.

If it is determined in step S59 of FIG. 10 that the command is not a storage restoration command, the sensor control circuit 20
In step S63, the MPU 1 resets all data in step S64 if the determination result is YES, and returns to the main routine immediately if NO in step S64. Resetting all data here means resetting the fire monitoring data collected so far, as well as resetting (turning off) the operation indicator and fire indicator lighting data, and turning on the fire detector after turning on the power. It is to restore to the initial state. After the end of the 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.
Is started when the power of the fire detector is turned on, when a test command is issued from the receiver, or when a timer interrupt process is performed. However, when to start the test routine may be selected by a switch or the like. In step S71 in FIG. 11, the sensor control circuit 20 sets the left or right internal pseudo light source (internal LE).
D) Flashing lighting of 3Lb, 3Lr or 3Rb, 3Rr. In this case, the pseudo light is flushed at about 8 to 12 Hz, which is a flame fluctuation frequency band.

The sensor control circuit 20 controls the photodiode 1L and the pyroelectric element 2L or the photodiode 1
Each light reception data based on the detection signal of R and the pyroelectric element 2L is
Each data is sequentially read through a multiplexer and an A / D converter in the I / O interface, and the read data is sequentially stored in the RAM 4. Then, an averaging process is performed on the light-receiving data that has been read as much as possible within the range of time allowed until the fire is detected, and the averaged data is stored in the RAM 4 as light-receiving output data (step S).
72). After the end of the light reception data collection, the sensor control circuit 20 turns off the internal pseudo light source (step S73),
The ratio between 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. It is determined whether or not the received light data is normal based on whether or not the received light sensitivity is within a 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 no correction is necessary, and the flow proceeds to step S78. If not, the flow proceeds to step S75. In step S75, it is determined whether or not the calculated value of the light receiving sensitivity is not within the normal range but still within the correctable range as follows. In this embodiment, the permissible range of the light receiving sensitivity is set in advance to, for example, 1.00 to 0.50 and stored in the ROM 3. Then, the calculated value of the light receiving sensitivity is the lower limit value of the allowable range (0.
50) It is determined whether or not the received light data can be corrected based on whether or not the above is satisfied.

In this embodiment, a value (for example, 0.60) slightly higher than the lower limit (0.50) of the permissible range of the light receiving sensitivity is previously set as the lower limit. In the step S75, it is determined at the same time whether the calculated value of the light receiving sensitivity is equal to or smaller than the lower limit value.

If it is determined in step S75 that the correction is possible, the sensor control circuit 20 multiplies the light receiving data by the reciprocal of the light receiving sensitivity calculation value to perform a calculation for correcting the sensitivity deterioration. Is stored in the RAM 3 (step S76). Then, control goes to a step S78. Then, in step S75, when it is determined that the light receiving sensitivity calculation value is equal to or less than the lower limit value of the allowable range (0.50 in the above example) and sensitivity correction is not possible beyond the limit, the fire detector proceeds to step S75. In S77, the sensitivity abnormal signal of the corresponding light receiving element is transmitted to the receiver. In step S75, a comparison with the prefix lower limit (0.60 in the above example) is made, and if the light receiving sensitivity calculation value is equal to or smaller than the prefix lower limit,
Similarly, in step S77, an advance notice signal of reception sensitivity deterioration (a signal immediately before the sensitivity deterioration and indicating that preparation for repair such as parts arrangement is required) is reported to the receiver.

The receiver receiving the abnormal signal of the light receiving element from the fire detector repeatedly performs the sensitivity test of the same light receiving element of the corresponding fire detector, and repeats the sensitivity test a predetermined number of times (for example, three times).
If the above abnormal signal is returned, the corresponding light receiving element is determined to have failed, and a repair instruction is immediately issued. Also, when the receiver receives the advance notice signal of the light receiving sensitivity deterioration, the same operation is repeatedly performed for confirmation, and after the confirmation, repair is prepared. In the above test, the left test and the right test are performed separately.

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

In a state where the external pseudo light source is made to emit light, the sensor control circuit 20 receives the light receiving data based on the detection signal of the photodiode 1L or 1R, which is a light receiving element, using the multiplexer and the A in the I / O interface, respectively. The data is sequentially read via a / D converter, and the read data is sequentially stored in the RAM 4. Then, an averaging process is performed on the light-receiving data read as much as possible within the allowable time range, and the averaged data is stored in the RAM 4 as light-receiving output data (step S79). In the case of the contamination test of the light-receiving glass 7, only one light-receiving element is sufficient, so that the light-receiving data of the pyroelectric element is not used in this embodiment.

After the completion of the data collection, the sensor control circuit 20 turns off the external pseudo light source (step S80), and calculates a dimming rate for each of the left and right sides of the light receiving glass 7 (step S81). The dimming rate is calculated as a ratio between the averaged light receiving data and a dimming rate reference value stored in the ROM 5 in advance. In this example,
The permissible range of the dimming rate is set in advance such 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 based on whether or not the calculated value of the dimming rate is equal to or more than the lower limit of the allowable range (0.50 in the above example) (step S8).
2).

In this embodiment, a value (for example, 0.60) slightly higher than the lower limit (0.50) of the allowable range of the dimming rate is set in advance as the lower limit. In the step S82, it is determined at the same time whether or not the calculated value of the dimming rate is equal to or smaller than the preceding lower limit value.

If it is determined in step S82 that the correction can be performed, the sensor control circuit 20 multiplies the light receiving data by the reciprocal of the calculated extinction ratio to perform a correction operation for the contamination, and The value of the rate is stored in the RAM 2 (step S83). Then, in step S82, when it is determined that the dimming rate calculation value is equal to or less than the lower limit value of the allowable range (0.50 in the above example) and the contamination correction is not possible beyond the limit, the fire detector sets In step S84, a stain abnormality signal on the left or right side of the light receiving glass 7 is transmitted to the receiver. In step S82, a comparison with the prefix lower limit value (0.60 in the above example) is made, and if the calculated dimming rate value is equal to or less than the prefix lower limit value, similarly, in step S84. A notice signal of a stain abnormality (a signal immediately before the stain abnormality and indicating that the light receiving direction of the light receiving glass 7 needs to be cleaned) is notified to the receiver.

The receiver that has received the contamination abnormality signal from the fire detector repeatedly performs the contamination test on the light receiving glass of the fire detector, and returns an abnormality signal that is repeated a predetermined number of times (for example, three times) or more. In such a case, it is determined that the light receiving glass is soiled, and an instruction for cleaning is given immediately. Also, when the receiver receives the advance notice signal of the contamination abnormality, the confirmation by the repetitive operation is similarly performed, and after the confirmation, the cleaning preparation instruction is performed. In the above test, the left test and the right test are performed separately.

The flame detecting 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 a flame that has actually occurred and in the case of a pseudo flame signal generated by 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 performed in step S in FIG.
The processing is the same as the processing in step 31, such as clearing of RAM data, checksum of ROM data, storage of initial data for correction of a single light receiving element, clearing of a counter, and waiting for a stabilization time of an amplifier.

Next, it is determined whether or not 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, light reception output data is read (step S93). The process of obtaining the averaged data of the received light output data read as much as possible within the allowable range of time is the same as the process described in step S72 of FIG.

In step S94 in FIG. 12, the sensor control circuit 20 compares the difference data between the two light-receiving outputs with the fire discrimination threshold in the same manner as in step S38 in FIG. It is determined whether or not it has been detected. At this time, the received light output is determined after being corrected in the same manner as the processing in steps S33 to S37 in FIG. Step S
If no flame is detected in the determination at 94, the sensor control circuit 20 sets a value f of a counter provided in the RAM 6 to 0 to count the number of times of flame detection, and clears the count value of the counter (step S95). ). That is, this counter counts up sequentially when a flame detection signal is continuously input, but returns the count value to 0 until flame detection is not performed during the counting. Thereafter, the process returns to step S92.

If a flame is detected in step S94, the sensor control circuit 20 adds 1 to the previous count value f of the counter (step S96).
It is determined whether the value of the counter f is equal to or greater than a preset number F (for example, 3) (step S97). As a result of this determination, if 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 times of flame detection is repeated.

If the number of times of continuous flame detection (the value f of the counter) has reached or exceeded the set number F as a result of the determination in step S97, the inspection flag is turned on next. It is determined whether or not a false flame signal is detected (inspection flag is on) or a flame signal due to fire is detected (inspection flag is off) (step S98). If a false flame signal is detected, both the flame signal and the signal under inspection are set as transmission information (step S9).
9) If a fire flame signal is detected, only the flame signal is set as transmission information (step S100), and the process returns to step S92.

The sensor control circuit 20 determines in step S101
Then, it is determined whether or not the received data is an information request command, and in the case of the information request command, information set in advance in the fire detector, for example, the flame detection information set in steps S99 and S100 is transmitted. (Step S10
2), clear the information for which transmission has been completed (step S103). When transmitting the information set in step S102, the information may be transmitted with its own address added. If it is determined in step S101 that the received data is not an information request command, the sensor control circuit 20 determines whether the received data is an inspection start permission signal (step S104), and if the determination result is YES, When the power of the amplifier 19 of FIG. 1 which is the inspection notification signal receiving circuit is turned on and the inspection tester irradiates the fire detector with the optical signal of about 500 Hz which is the inspection notification signal, this irradiation is performed. The light is set to a detectable state (step S105).

When the maintenance worker brings the inspection tester close to the light receiving glass 7 of the fire detector to be inspected and operates it, the optical signal of about 500 Hz emitted from the tester receives the inspection notification signal light receiving element 6 and the amplifier. The detected signal is supplied to the sensor control circuit 20 via the sensor 19. Upon receiving the inspection notification signal, the sensor control circuit 20 immediately starts the inspection notification signal reception interrupt routine shown in the upper right part of FIG. Is set as transmission information so that the receiver can be notified to the receiver (step S111), the inspection flag is turned on (step S112), and step S9 is performed.
Return to 2.

If it is determined in step S104 that the signal is not the inspection start permission signal, the sensor control circuit 20 proceeds to FIG.
In step S106 of FIG. 3, it is determined whether the received data is a signal indicating that the fire detector has finished checking the fire detector.
The power supply of 9) is turned off (step S107). If it is determined in step S106 that the signal is not the inspection end signal, the sensor control circuit 20 proceeds to step S108 in FIG.
Then, it is determined whether or not the received data is a restoration signal to its own fire detector. If the result of this determination is YES, 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 a restoration signal, the process directly returns to step S92.

The radiant fire detector in the above embodiment is
The example of the case of the two-wavelength type in which the magnitude relation of the radiant energy detected in the two wavelength bands of the radiant light from the flame is shown, but the present invention is not limited to this. Even if it is a constant radiation type that detects the amount of radiation energy in the band, a flicker type that detects flicker specific to the flame, or a method that uses three or more wavelengths, the light receiving element is placed inside the translucent cover. The present invention is applicable to all the radiant fire detectors provided, and can provide the same effect.

The radiant fire detector in the above embodiment is
Although an example has been shown in which there are two sensing areas on the front left and right sides with respect to the installation surface, the present invention is not limited to this. Even if it is provided in the center of the plaza and has four sensing areas of front left and right and back left and right, that is, a radiant fire sensor having one or more sensing areas Also, the same effect can be obtained by applying the present invention.

[0089]

As described above, according to the present invention, a light-transmitting cover for transmitting radiation light radiated from a flame, and a light transmitted from the light-transmitting cover provided inside the light-transmitting cover. And a means for detecting a fire based on a detection signal of the light receiving element, wherein the first test light emitting element provided outside the translucent cover emits light. A first operation test of irradiating the light-receiving element through the light-transmitting cover by the first pseudo-flame signal obtained can be performed, and the light-receiving element can be used at the time of the first operation test. Calculate the dimming rate of the light-transmitting cover from the detection signal level of the light-receiving element, and when the calculated dimming rate is equal to or more than the lower limit of the allowable range, according to the calculated value of the dimming rate, Change the amplification of the amplifier that amplifies the output, or By changing the threshold for sensing a fire, automatically compensate for fouling of the translucent cover, further
In addition, the limit notification means is limited to automatic compensation for translucent cover contamination
Signal to the outside or exceeding the limit
Since the notification is made, it is possible to perform a self-check of the operation failure due to the contamination of the translucent cover, and it is possible to greatly reduce the number of work steps conventionally required for cleaning the translucent cover and manually compensating for the contamination. Was. In addition, maintenance personnel
When it is necessary to clean the light cover or replace the light receiving element.
It is now possible to automatically know when it will be needed.

Further, according to the present invention, the light receiving element is irradiated with the second pseudo flame signal emitted from the second test light emitting element provided inside the translucent cover of the radiation type fire detector. The second operation test is performed, and at the time of testing the second operation test means, the light reception sensitivity of the light receiving element is calculated from the detection signal level of the light receiving element. If not less than the lower limit of the allowable range, depending on the calculated value of the light receiving sensitivity, change the amplification degree of the amplifier that amplifies the output of the light receiving element, or change the threshold value for detecting fire. Automatically compensates for the deterioration of the light receiving sensitivity, and furthermore, the limit reporting means
Signal that the automatic compensation for
I sent a signal to the outside that the limit was exceeded
In the malfunction due to the deterioration of the receiving sensitivity of the light receiving element is possible self-check, to the number of operation steps required for manual compensation of desensitization of the conventional light receiving element can be greatly reduced. Also, maintenance personnel need to clean the translucent cover.
Automatically know when it is necessary to replace the light receiving element
Now you can do it.

[0091]

[0092]

Further, according to the present invention, the determination of the degree of contamination of the light-transmitting cover of the radiation type fire detector and the determination of the degree of deterioration of the light receiving sensitivity of the light receiving element are respectively performed at the minimum and maximum allowable ranges. Because the pre-lower limit set slightly above the value is used in two stages, so that the advance notice signal before the automatic compensation of the contamination or the automatic compensation of the sensitivity deterioration reaches the limit can be received. In other words, there is more time to prepare for cleaning and repair parts.

Further, according to the present invention, a plurality of sensing areas are set in advance as substantially independent three-dimensional spaces, respectively, and radiant light radiated from the flames in the set plurality of sensing areas, respectively, is applied to each of the plurality of sensing areas. A light-transmitting cover that transmits light in each direction of the sensing area, and a plurality of light receiving elements that are provided inside the light-transmitting cover and receive the light that is transmitted in the direction of the light-transmitting cover for each sensing area. And a means for detecting a fire for each of the plurality of sensing areas based on the detection signals for each of the plurality of light receiving elements, wherein the translucent material is provided for each of the plurality of sensing areas. According to the first pseudo flame signal emitted from each of the plurality of first test light emitting elements provided outside the cover, the light receiving element for each of the plurality of sensing areas is transmitted through the light transmitting cover and separated. 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,
The second pseudo-flame signal emitted from each of the plurality of second test light emitting elements provided inside the translucent cover for each of the plurality of sensing regions respectively provides the plurality of sensing regions. It is also possible to irradiate the light-receiving element separately, and to perform a second operation test as to whether or not the means for detecting a fire operates normally for each of the plurality of sensing areas,
Further, at the time of the first operation test, for each of the plurality of sensing areas, the light reduction rate of the transmissive cover is calculated from the detection signal level of the light receiving element, and the calculated light reduction rate is within an allowable range. Depending on whether or not there is, the automatic compensation of the contamination of the light-transmitting cover in the direction of each of the sensing areas is performed, or a signal indicating that the limit of the contamination compensation for each of the sensing areas is exceeded is notified to the outside, and During the operation test, for each of the plurality of sensing regions, the light receiving sensitivity of the light receiving element is calculated from the detection signal level of the light receiving element, and the light receiving sensitivity calculation value is within an allowable range. Automatically compensates for the light receiving sensitivity of the light receiving element for each sensing area, or sends a signal to the outside indicating that the sensitivity compensation limit for each sensing area has been exceeded. Sensing area that was performing sensing However, since a single fire detector is sufficient, the equipment cost is reduced, and maintenance work is reduced by eliminating the need for manual compensation for contamination of the translucent cover and deterioration of the sensitivity of the light-receiving element for each sensing area. It is now possible to know the timing and cause of operation failure for each region.

Further, according to the present invention, the determination of the degree of contamination of the translucent cover and the degree of deterioration of the light receiving sensitivity of the light receiving element for each sensing area of the radiant fire detector having the plurality of sensing areas are as follows: Each of the plurality of sensitivity regions is automatically controlled by the use of the lower limit value of the allowable range and the lower limit value set slightly before the lower limit value. The advance notice signal that the compensation or the automatic compensation of the sensitivity deterioration reaches the limit can be received, and the time for preparing for cleaning and preparing for repair parts can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram of the radiation type fire detector of FIG. 1;

FIG. 3 is a diagram illustrating left and right sensing areas of the radiant fire detector of FIG. 1;

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

FIG. 5 is a configuration block diagram illustrating an example of a sensor control circuit of FIG. 1;

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

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

FIG. 8 is a flowchart showing a main routine of a control program for the radiation type fire detector of FIG. 1;

FIG. 9 is a flowchart showing a first part of the reception interruption program of the radiation type fire detector of FIG. 1;

FIG. 10 is a flowchart showing a second part of the reception interruption program of the radiation type fire detector of FIG. 1;

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

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

FIG. 13 is a flowchart showing a second part of the flame detection program of the radiation type 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, right photodiode 2L, 2R left, right pyroelectric element 3Lb, 3Lr left internal LED 3Rb, 3Rr right internal LED 4L, 4R left, right external LED 5L, 5R left, right operation / fire indicator 6 Inspection Notification signal light receiving element 7 Light receiving glass 8L, 8R Left, right transparent glass 9A Case A 9B Case B 11L, 12L Left preamplifier 11R, 12R Right preamplifier 13L, 14L Left amplifier 13R, 14R Right amplifier 15L-18L Left smoothing circuit 15R-18R Right side smoothing circuit 19 Amplifier 20 Sensor control circuit 21 Transmission control circuit 22 Signal transmission / reception 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 (5)

(57) [Claims] 1. A light-transmitting cover for transmitting radiation emitted from a flame, a light-receiving element provided inside the light-transmitting cover, for receiving light transmitted from the light-transmitting cover, and the light-receiving element. And a means for detecting a fire based on the detection signal of the above, wherein the fire detector is provided outside the translucent cover, and emits a first simulated flame signal by driving the first operation test means; A first test light-emitting element that irradiates the light-receiving element through the light-transmitting cover, and drives the first test light-emitting element to emit a first pseudo-flame signal to cause the light-receiving element to emit light. A first operation test means for irradiating, and a test signal level of the light receiving element is measured at the time of the test of the first operation test means, and a light extinction ratio of the translucent cover is calculated based on the measured value. The dimming rate calculating means, and the calculated value of the dimming rate is Contamination degree determining means for determining whether or not the lower limit value of the set dimming rate allowable range or more,
If the determination result of the contamination degree determining means is affirmative, the amplification degree of the amplifier for amplifying the output of the light receiving element is changed or the threshold value for detecting a fire is changed according to the calculated value of the dimming rate. the varied, and automatic compensation means fouling comprising a fouling compensating means for compensating for fouling of the translucent cover, soil
When the compensation by the automatic compensation means for loss has reached the limit or
When transiting the world, the compensation for contamination of the translucent cover has reached its limit
A signal indicating that the signal has been reached or the limit has been exceeded.
A radiant fire detector, comprising: a limit reporting means for reporting . 2. A light-transmitting cover for transmitting radiation emitted from a flame, a light-receiving element provided inside the light-transmitting cover and receiving light transmitted from the light-transmitting cover, and a light-receiving element. A radiant fire detector having means for detecting a fire based on a detection signal, wherein the fire detector is provided inside the translucent cover, emits a second simulated flame signal by driving a second operation test means, and Or a second test light emitting element that indirectly irradiates the light receiving element; and a second light emitting element that drives the second test light emitting element to emit a second pseudo flame signal and irradiates the light receiving element. An operation test unit; a light receiving sensitivity calculating unit that measures a detection signal level of the light receiving element during a test of the second operation testing unit and calculates a light receiving sensitivity of the light receiving element based on the measurement value; Calculated sensitivity value set in advance Light-receiving sensitivity determining means for determining whether or not the light-receiving sensitivity allowable range is equal to or more than a lower limit value. If the determination result of the light-receiving sensitivity determining means is positive, the light-receiving sensitivity Changing the degree of amplification of the amplifier that amplifies the output of the element, or changing the threshold value for detecting a fire, and automatically adjusting the light receiving sensitivity including light receiving sensitivity compensating means that compensates for the deterioration of the light receiving sensitivity; , The compensation by the automatic compensation means of the light sensitivity reaches the limit
The light receiving element
Signal that the compensation has reached the limit or that the limit has been exceeded
A radiant fire detector, comprising: a limit reporting unit that reports a signal to the outside . 3. A light-transmitting cover for transmitting radiation emitted from a flame, a light-receiving element provided inside the light-transmitting cover, for receiving light transmitted from the light-transmitting cover, and the light-receiving element. And a means for detecting a fire based on the detection signal of the radiant fire sensor, provided outside the translucent cover, emits a first simulated flame signal by driving the first operation test means, A first test light-emitting element that irradiates the light-receiving element through the light-transmitting cover; and drives the first test light-emitting element to emit a first pseudo-flame signal to cause the light-receiving element to emit light. Irradiating, a first operation test means for testing whether or not the means for detecting the fire 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 for directly or indirectly irradiating the light receiving element, and irradiating the light receiving element by driving the second test light emitting element to emit a second pseudo flame signal; Second operation test means for testing whether or not the means for detecting a fire operates normally based on a detection signal of the light receiving element; and a detection signal of the light receiving element when the first operation test means is tested. A dimming rate calculating means for measuring a level and calculating a dimming rate of the light-transmitting cover based on the measured value; and calculating the calculated dimming rate value in a predetermined dimming rate allowable range. First and second pollution degree determinations for determining whether or not the value is not less than a lower limit value and determining whether or not a value is not less than a pre-set lower limit value set in advance to a value slightly above the lower limit value, respectively; Means and the result of the first contamination degree determination means are positive In accordance with the calculated value of the dimming rate, the degree of amplification of the amplifier that amplifies the output of the light receiving element is changed, or the threshold value for detecting a fire is changed to reduce the contamination of the translucent cover. Stain compensation means for compensating, and when the determination result of the second stain degree determination means is negative, a signal to the effect that cleaning of the translucent cover is required is notified to the outside,
Further, when the determination result of the first pollution degree determination means is negative, the pollution compensation means and the situation reporting means including a pollution situation reporting means for reporting a signal indicating that the pollution compensation limit has been exceeded to the outside. At the time of the test of the second operation test means, a light receiving sensitivity calculating means for measuring a detection signal level of the light receiving element and calculating a light receiving sensitivity of the light receiving element based on the measured value; Is determined to be greater than or equal to a lower limit of a preset light-receiving sensitivity allowable range and to determine whether or not is greater than or equal to a pre-set lower limit set to a value slightly above the lower limit. First and second light receiving sensitivity determining means for performing the following, respectively, when the determination result of the first light receiving sensitivity determining means is positive, according to the calculated value of the light receiving sensitivity,
By changing the amplification degree of the amplifier for amplifying the output of the light receiving element, or by changing the threshold value for detecting fire,
When the light receiving sensitivity compensating means for compensating for the deterioration of the light receiving sensitivity and the determination result of the second light receiving sensitivity determining means is negative,
A prior signal of light receiving sensitivity deterioration is reported to the outside, and the first
When the determination result of the light-receiving sensitivity determining means is negative, the light-receiving sensitivity automatic notifying and status notifying means includes: a light-receiving sensitivity status notifying means for notifying a signal indicating that the light-receiving sensitivity compensation limit has been exceeded to the outside. A radiant fire detector, comprising: 4. A plurality of sensing regions are set in advance as substantially independent three-dimensional spaces, respectively, and radiation light radiated from a flame in each of the set plurality of sensing regions is divided into directions of the respective sensing regions. A plurality of light-transmitting covers for transmitting light, a plurality of light-receiving elements provided inside the light-transmitting cover, and each of the plurality of light-receiving elements for receiving the transmitted light in the direction of the light-transmitting cover for each sensing region; Means for detecting a fire for each of the plurality of sensing areas based on a detection signal for each light receiving element, wherein the plurality of sensing areas are provided outside the translucent cover for each of the plurality of sensing areas. The first operation test means drives each of the sensing areas to emit a first simulated flame signal, and passes 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
Means for emitting a pseudo flame signal, individually irradiating the light receiving elements for each of the plurality of sensing areas, and means for normally detecting a fire for each of the plurality of sensing areas based on the detection signal for each of the light receiving elements. First operation test means for testing whether or not to operate, respectively; provided for each of the plurality of sensing areas inside the light-transmitting cover, respectively; A plurality of second test light emitting elements each of which emits a second simulated flame signal by driving and directly or indirectly irradiates a light receiving element for each of the sensing regions, respectively; and the plurality of second test light emitting elements By driving the elements individually,
Means for emitting a pseudo flame signal, individually irradiating the light receiving elements for each of the plurality of sensing areas, and means for normally detecting a fire for each of the plurality of sensing areas based on the detection signal for each of the light receiving elements. Second operation test means for testing whether or not to operate, respectively, at the time of the test of the first operation test means, to measure the detection signal level of the light receiving element irradiated for each of the plurality of sensing regions, respectively, A dimming rate calculating unit that calculates a dimming rate for each of the plurality of sensing area directions of the translucent cover based on the measured values, and a calculated value of the dimming rate for each direction is set in advance. Means for determining whether each of the sensing areas is equal to or more than the lower limit value of the permissible range of the dimming rate. If the determination result of each of the sensing areas by the stain degree determining means is affirmative, the reduction in the direction of the corresponding sensing area is performed. According to the calculated value of the light rate, By changing the amplification degree of an amplifier that amplifies the output of the light-receiving element, or by changing the threshold value for detecting a fire, thereby compensating for the contamination in each of the sensing region directions of the translucent cover, respectively. If the determination result of each sensing area by the pollution degree determining means is negative, the pollution limit reporting means for reporting a signal to the outside that the pollution compensation in the direction of the corresponding sensing area has exceeded the limit. Compensation and limit notification means, and at the time of testing the second operation test means, measure the detection signal level of the light receiving element irradiated for each of the plurality of sensing regions, and based on the measured values, Light-receiving sensitivity calculating means for calculating the light-receiving sensitivity of the light-receiving element for each area; and determining whether or not the calculated value of the light-receiving sensitivity for each of the sensing areas is equal to or greater than a lower limit of a predetermined light-receiving sensitivity allowable range. The light receiving sensitivity determining means for performing each determination and, when the determination result of each sensing area by the light receiving sensitivity determining means is affirmative, the output of the light receiving element of the corresponding sensing area is calculated according to the calculated value of the light receiving sensitivity of the corresponding sensing area. Light sensitivity compensating means for compensating for the deterioration of light sensitivity for each of the plurality of sensing areas by changing the amplification degree of the amplifier for amplification or changing the threshold value for detecting a fire; If the determination result of each sensing region by the means is negative, the light sensitivity limit notifying means for notifying the signal to the outside that the compensation of the light sensitivity of the corresponding sensing region has exceeded the limit, respectively; A radiant fire detector comprising a limit notification means. 5. A plurality of sensing areas are set in advance as substantially independent three-dimensional spaces, and radiation light radiated from a flame in each of the set plurality of sensing areas is divided into directions for each of the sensing areas. A plurality of light-transmitting covers for transmitting light, a plurality of light-receiving elements provided inside the light-transmitting cover, and each of the plurality of light-receiving elements for receiving the transmitted light in the direction of the light-transmitting cover for each sensing region; Means for detecting a fire for each of the plurality of sensing areas based on a detection signal for each light receiving element, wherein the plurality of sensing areas are provided outside the translucent cover for each of the plurality of sensing areas. The first operation test means drives each of the sensing areas to emit a first simulated flame signal, and passes 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
Means for emitting a pseudo flame signal, individually irradiating the light receiving elements for each of the plurality of sensing areas, and means for normally detecting a fire for each of the plurality of sensing areas based on the detection signal for each of the light receiving elements. First operation test means for testing whether or not to operate, respectively; provided for each of the plurality of sensing areas inside the light-transmitting cover, respectively; A plurality of second test light emitting elements each of which emits a second simulated flame signal by driving and directly or indirectly irradiates a light receiving element for each of the sensing regions, respectively; and the plurality of second test light emitting elements By driving the elements individually,
Means for emitting a pseudo flame signal, individually irradiating the light receiving elements for each of the plurality of sensing areas, and means for normally detecting a fire for each of the plurality of sensing areas based on the detection signal for each of the light receiving elements. Second operation test means for testing whether or not to operate, respectively, at the time of the test of the first operation test means, to measure the detection signal level of the light receiving element irradiated for each of the plurality of sensing regions, respectively, A dimming rate calculating unit that calculates a dimming rate for each of the plurality of sensing area directions of the translucent cover based on the measured values, and a calculated value of the dimming rate for each direction is set in advance. And a determination is made as to whether or not it is equal to or greater than a lower limit value of a predetermined dimming rate allowable range and is equal to or greater than a pre-set lower limit value set in advance to a value slightly higher than the lower limit value. First and second contamination degree determining means; If the determination result of each sensing area by the loss degree determining means is affirmative, the amplification degree of the amplifier for amplifying the output of the light receiving element in the corresponding sensing area is changed according to the calculated value of the dimming rate in the corresponding sensing area. Or, by changing the threshold value for detecting a fire, the pollution compensating means for compensating for the stain in each sensing area direction of the translucent cover, and the sensing area of each sensing area by the second stain degree discriminating means. If the determination result is negative, a signal indicating that the light-transmitting cover needs to be cleaned in the direction of the corresponding sensing area is notified to the outside.
If the determination result of each sensing area by the pollution degree determining means is negative, the pollution compensation means includes a pollution status reporting means for reporting a signal to the outside that the pollution compensation in the corresponding sensing area has exceeded the limit. And at the time of testing by the second operation test means, a detection signal level of a light receiving element irradiated for each of the plurality of sensing areas is measured, and the respective sensing areas are measured based on the measured values. Light-receiving sensitivity calculating means for calculating the light-receiving sensitivity of each light-receiving element, and determining whether or not the calculated value of the light-receiving sensitivity for each of the sensing regions is equal to or greater than a minimum value of a predetermined light-receiving sensitivity allowable range; First and second light receiving sensitivity discriminating means for discriminating whether or not a predetermined lower limit value which is a value slightly higher than the lower limit value is set in advance; and Perception If the determination result of the area is affirmative, the amplification degree of the amplifier for amplifying the output of the light receiving element in the corresponding sensing area is changed or the fire detection threshold is changed according to the calculated value of the light receiving sensitivity of the corresponding sensing area. A light-receiving sensitivity compensating means for changing the value to compensate for the deterioration of the light-receiving sensitivity of each of the plurality of sensing areas; and The prior signal of the light receiving sensitivity deterioration of the area is reported to the outside, and if the result of the judgment of each sensing area by the first light receiving sensitivity judging means is negative, the light receiving sensitivity compensation of the corresponding sensing area has exceeded the limit. A radiation-type fire detector, comprising: a light-receiving-sensitivity-status notifying means for notifying the signal of the above to the outside;