JP2002063664A - Disaster prevention monitoring system and disaster prevention receiving panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suitably perform maintenance and management including cleaning by visually grasping how much the translucent window of a fire detector is dirty. SOLUTION: The disaster prevention receiving panel receives an analog dirt value signal (extinction rate) transmitted from an optical fire detector and stores that signal in a storage part, separately for every detection time, the read analog dirt value signal is converted into the luminance of a symbol, the symbols of plural fire detectors are displayed as two-dimensionally arrayed symbol images 61 by axes respectively showing install positions and detection times, and the history of stored analog dirt value signals is read out, converted into the luminance of correspondent symbol and displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disaster prevention monitoring system for monitoring the state of an optical fire detector for monitoring a fire in a space in a bad environment such as a tunnel, and a disaster prevention receiver. The present invention relates to a disaster prevention monitoring system and a disaster prevention receiver provided with a function of monitoring the degree of contamination of a translucent window provided.

[0002]

2. Description of the Related Art Conventionally, for example, a plurality of fire detectors for detecting a fire in a tunnel are installed on a wall surface or a ceiling in a tunnel at regular intervals. Detects fire in the area up to the fire detector to be deployed. As such a fire detector, a fire is detected by using a light receiving element receiving light or radiant heat from a flame, and a fire signal is transmitted to a disaster prevention receiver.

As a method of detecting a fire, a method of detecting whether the output level of the received light energy in a specific wavelength band is equal to or higher than a threshold value, or a two-wavelength method of judging a fire by comparing the output levels of the received light energy in a plurality of wavelength bands And a three-wavelength type. The fire detector is configured to detect the fire using separate light receiving elements on the left and right sides to detect the fire on both the left and right sides with respect to the installation position.

[0004] Since such a fire detector is installed in a tunnel through which cars frequently pass, the fire detector is housed in a housing so that the light receiving element is not broken or soiled, and light is incident on the front surface of the light receiving element. A translucent window is provided. However, in the tunnel, pollution-causing substances such as soot, dust, earth and sand, deicing agents, and other chemical substances emitted from vehicles float, causing these substances to enter the airflow. When it adheres to the fire detector, the light receiving output of the light receiving element decreases.

Therefore, a test light source is provided outside the translucent window of the fire detector, the light is periodically emitted, and the light is received by the light receiving element inside the translucent window, thereby detecting the degree of contamination of the translucent window. Thus, when a predetermined degree of contamination is exceeded, a contamination signal is transmitted to the disaster prevention receiver. In addition, the fire detector adjusts the sensitivity in accordance with the level of the received light output during the test, and performs sensitivity compensation in accordance with the degree of contamination of the translucent window.

When the facility manager receives the contamination signal at the disaster prevention receiver and outputs a pollution alarm, the facility manager gives instructions to the cleaning business operator to clean the translucent window of the fire detector. Become. Since such a cleaning operation involves traffic regulation in the tunnel, it is desirable that the cleaning operation be performed not only on the fire detector that issued the contamination signal but also on the surrounding fire detectors with a high degree of contamination.

[0007]

However, the stain signal from the conventional fire detector is an on / off signal that is output only when the degree of stain of the translucent window exceeds a predetermined value. It is not possible to know at all how much the degree of contamination of the fire detectors around it, as well as the fire detector that issued the signal, and whether it is sufficient to clean only the fire detector that issued the contamination signal, install it in the tunnel. It was difficult to determine whether the fire detector should be completely cleaned.

[0008] If the overall degree of contamination of the fire detector is known, it is possible to determine an appropriate cleaning time, but it is difficult at present. Furthermore, when a stain signal is issued, since the history of the stain status up to that point is not known at all, there is also a problem that the facility manager cannot judge the certainty even if there is a stain signal. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a disaster prevention monitoring system and a disaster prevention receiver capable of appropriately grasping the degree of contamination of the entire fire detector and appropriately performing maintenance including cleaning.

[0010]

In order to achieve this object, the present invention is configured as follows.

[0011] The present invention is a disaster prevention monitoring system in which a plurality of optical fire detectors are connected to a transmission line drawn from a disaster prevention receiver, wherein the optical fire detector has a light transmitting sensor in which a fire detection sensor is disposed. A signal processing unit that detects the degree of contamination of the sex window and transmits a contamination analog value signal, and the disaster prevention receiver receives the contamination analog value signal transmitted from the optical fire detector and divides the signal for each detection time It is characterized by comprising a storage unit for storing, and a stain display control unit for converting a stain analog value into a symbol brightness and displaying the symbol.

The pollution display control unit of the disaster prevention receiver displays a plurality of fire detector symbols in a one-dimensional array according to the installation position, and reads a stain analog value signal of an arbitrary detection time from the storage unit to respond. Converted to the symbol brightness and displayed.

The symbols corresponding to a plurality of optical fire detectors installed in such a tunnel or the like have a luminance corresponding to a stain analog value signal indicating the degree of contamination of the translucent window. By displaying the brightness of the symbol so that it becomes dark, the degree of contamination can be intuitively grasped by looking at the symbol, the degree of contamination of the overall fire detector can be grasped, and maintenance management including cleaning is properly performed. it can.

The stain display control section sequentially reads the history of the stain analog value signal (detection time, installation position, and history data of the stain analog value signal) stored in the storage section and converts the history into the brightness of the corresponding symbol. May be displayed as a moving image. In this display control, operation buttons such as [play], [pause], [stop], and [scroll] are arranged on the symbol screen, and the symbol screen is switched one frame at a time as in the reproduction of a moving image file. It is a way to grasp the change of Such a moving image display of the history of the stain analog value signal corresponding to the symbol array corresponding to the fire detector makes it possible to easily grasp the change in the stain degree with the passage of time.

The pollution display control section of the disaster prevention receiver displays the symbols of the plurality of fire detectors in a two-dimensional array with axes indicating the installation position and the detection time, and displays the stain analog value stored in the storage section. The history of the signal may be read, converted into the luminance of the corresponding symbol, and displayed.

In this case as well, by displaying the brightness of the symbols arranged two-dimensionally in accordance with the history of the stain analog value signal, it is possible to easily grasp the change in the degree of stain with the passage of time, and to provide an overall fire detector. The degree of contamination can be ascertained and maintenance management including cleaning can be appropriately performed. For example, the number of detectors is 200, and measurement is performed once a day for 180 days (3 days).
), Even in the history of dirty analog value signals like
Small symbols of 200 × 180 can be displayed collectively on a two-dimensionally arranged screen, and the change in the degree of contamination with the passage of time can be easily grasped.

Further, when detecting a click operation of an arbitrary display symbol, the stain display control unit of the disaster prevention receiver reads out the history of the corresponding stain analog value signal stored in the storage unit and displays a trend graph. . By displaying the trend of the contamination analog value signal by the symbol click, it is possible to check the details of the contamination degree of each optical fire detector as needed.

The optical fire detector used in the present invention is provided with a translucent window having a predetermined monitoring area as a field of view, and is disposed in the translucent window. A detection sensor that outputs as a, a fire determination unit that determines a fire based on a light reception detection signal output from the detection sensor, and a test light source provided near the outside of the translucent window,
A test light detection sensor that is arranged in the light transmitting window and converts light energy into an electric signal and outputs the signal as a light reception detection signal, and the signal processing unit transmits the test light transmitted from the test light source. Via a light window, a light receiving signal obtained by allowing the test light detection detection sensor to receive light detects at least the degree of contamination of the light transmitting window, and shows the detected degree of contamination of the light transmitting window. The analog value signal is transmitted to the outside.

Further, the present invention provides a disaster prevention receiver in which a plurality of optical fire detectors are connected to a transmission line led out to the outside. The disaster prevention receiver of the present invention transmits a signal from the optical fire detector. A storage unit for receiving the stained analog value signal and storing it for each detection time, and a stain display control unit for converting the stained analog value into symbol brightness and displaying the symbol. The details of this disaster prevention receiver are the same as those of the disaster prevention monitoring system.

[0020]

FIG. 1 is an explanatory diagram of a schematic configuration of a disaster prevention monitoring system for a tunnel according to the present invention.

In FIG. 1, a transmission line 2 is drawn out from a disaster prevention receiver 1 installed in a monitoring room or the like to a tunnel 4 side, and a fire detector 3 of the present invention is connected to the transmission line 2.
Are provided at regular intervals L in the longitudinal direction of the tunnel 4.

Each of the fire detectors 3 is installed on the tunnel wall 4a or the ceiling of the roadway of the tunnel 4.
Monitors the compartments on both sides along the length of the tunnel.

For this reason, when a fire occurs in a certain section due to a vehicle accident or the like and a fire source F occurs, this section is monitored by the fire detectors 3 located on both sides in an overlapping manner.
The two fire detectors 3 on both sides detect a fire and send a fire detection signal to the disaster prevention receiver 1.

In response to this, the disaster prevention receiver 1 determines the section where the fire has occurred from the fire detection signal of the fire detector, and fires the water spray head of the water spray facility installed on the ceiling side of the tunnel 4, for example. The fire spraying water is sprayed by controlling the activation of the water spray automatic valve in the section where the fire has occurred and the sections on both sides thereof.

FIG. 2 is a block diagram of a detailed configuration of the disaster prevention monitoring system of FIG. In FIG. 2, a main control unit 5 is provided in the disaster prevention receiver 1, and a transmission control unit 6 is provided for the main control unit 5. Tunnel 4 from transmission control unit 6
A plurality of fire detectors 3 installed in a tunnel 4 are connected. A relay amplifier 7 is provided in the middle of the transmission line 2 in the tunnel 4, and relays and amplifies a transmission signal between the disaster prevention receiver 1 and the fire detector 3.

An operation display control unit 8 is provided for the main control unit 5 of the disaster prevention receiver 1 via a bus. The operation display control unit 8 has a display unit 9, an operation unit 10, and a sound unit. 1
1 are connected. The main control unit 5 includes, for example, an SRAM.
A storage unit 12 and a stain display control unit 13 using the same are provided. Further, a printer 14 is provided for the main control unit 6 via a bus so that various data necessary for monitoring and controlling the disaster prevention receiver 1 can be printed out.

An external CRT 16 is connected to the main control unit 5 via a communication control unit 15, and various kinds of reception information necessary for monitoring and controlling the disaster prevention receiver 1 are transmitted to the CRT 1.
6 can be displayed.

The storage unit 12 of the main control unit 5 stores an analog value signal indicating the degree of contamination of the translucent window detected at the time of the test performed once a day on the fire detector 3 side, for example. I have. Further, the stain display control unit 13 reads out the stain analog value signal stored in the storage unit 12, converts the signal into the luminance of the symbol, and displays it.

The display of the stained analog value signal based on the symbol luminance is performed by one-dimensionally arranging the symbols in accordance with the installation position of the fire detector 3 in the tunnel 4 and displaying the stained analog value signal at an arbitrary measurement time in a luminance display. Alternatively, the history of the stained analog value signal for a certain period is read and the symbol luminance is displayed in a moving image.

The symbols are arranged two-dimensionally by arranging the symbol rows one-dimensionally arranged according to the installation position of the fire detector 3 in the tunnel 4 in the order of the measurement time once a day, and storing the symbols in the storage unit 12. It is also possible to read out the history of the stained analog value signal, convert it to symbol brightness, and display it as an image.

FIG. 3 is a front view of the fire detector of the present invention for detecting a fire in a tunnel. In FIG. 3, the fire detector 3 of the present invention includes a cover 3a and a main body 3b, and light-transmitting windows 18a and 18b are arranged on inclined surfaces formed on the left and right of the cover 3a, respectively. , 18b incorporate a two-wavelength detection sensor.

A test light source accommodating portion 19 is provided above the translucent windows 18a and 18b, and a test light source, which will be described later, is provided at the lower left and right positions. The cover 3a is fixed to the main body 3b by mounting screws 22 provided at three places. A signal cable 21 for the fire detector 3 is connected by a waterproof connector 20.

The fire detector 3 of the present invention is mounted on a separately prepared storage box, and the portions of the translucent windows 18a and 18b and the test light source storage section 19 are arranged on the front of the box from the front panel of the storage box. At a protruding degree, it is attached to the tunnel wall by the storage box.

FIG. 4 is a sectional view of the internal structure of the fire detector 3 of the present invention. In FIG. 4, the fire detector 3 is a cover 3
a and a main body 3b, and is partitioned by providing a mold cover 23 inside. Waterproof connector 2 provided on main body 3b
The signal line 25 from the receptacle 0 is connected to the lightning arrester board 24 attached to the lower part of the mold cover 23 by a connector.

A main circuit board 26 is fixed in a space formed by the mold cover 23 and the cover 3a. The main circuit board 26 has sensor portions 28a, 28b, which are opposed to the translucent windows 18a, 18b arranged on the inclined surface of the cover 3a.
28b are arranged with a tilt angle of approximately 45 °.

Each of the sensor sections 28a and 28b is provided with a first detection sensor 29 and a second detection sensor 30. In this embodiment, the first detection sensor 1
The flame due to the fire is monitored by a two-wavelength method for distinguishing between the flame due to the fire and the other noise radiation sources based on the respective light reception detection outputs of the ninth and second detection sensors 30.

Test light source windows 31a and 31b are provided on both sides of the lower surface of the test light source storage portion 19 protruding from the cover 3a, and transmissive windows 18a and 18b corresponding to test light emitted from the built-in test light source. Through the sensor units 28a, 2
By irradiating the first and second detection sensors 29 and 30 of FIG. 8b, a function test including detection of the degree of contamination of the translucent windows 18a and 18b can be determined.

Here, the first detection sensor 29 has a wavelength band of approximately 4.5 μ due to the resonance radiation of CO ₂ during flaming combustion.
The emitted light is detected by the characteristic of a narrow band-pass filter having a center wavelength of m. On the other hand, the second detection sensor 30
Has a radiation light detection characteristic obtained by a band-pass filter characteristic of about 5.0 to 7.0 μm.

Specifically, the translucent window 18 of the fire detector 3
6. By using sapphire glass for a and 18b,
A high-cut characteristic for cutting light exceeding a wavelength of 0 μm is set, whereby the light passing through the translucent windows 18 a and 18 b is reduced to a wavelength of 7.0 μm or less, and enters the first and second detection sensors 29 and 30. I have.

The detection window of the first detection sensor 29 itself is provided with an optical wavelength filter constituting a narrow band-pass filter characteristic having a center wavelength of 4.5 μm. Also the second
The detection window of the detection sensor 30 is provided with an optical wavelength filter having a broadband bandpass filter characteristic for transmitting light having a wavelength of 5.0 μm or more.

Accordingly, the first detection sensor 29 detects light in a narrow band of about 4.5 μm due to resonance radiation of CO ₂ generated at the time of flame combustion having a center wavelength of 4.5 μm. On the other hand, the second detection sensor 30 detects light in a wavelength band of about 5.0 to 7.0 μm as a band-pass filter.

As a result, the spectrum characteristics of the combustion flame, the sunlight as a noise radiation source, the spectrum of a low-temperature radiator at 300 ° C. generated by heating the engine of a vehicle running in a tunnel, and the spectrum of a human body are accurately measured. Fire flames can be identified and detected. More specifically, the detection outputs of the first detection sensor 29 and the second detection sensor 30 for the combustion flame and other noise radiation sources such as sunlight, a low-temperature radiator such as a vehicle engine, and a human body are experimentally measured. Calculate the relative ratio, set the threshold of the relative ratio that the combustion flame and the noise radiation source can be distinguished, and judge it as a fire flame when detecting the radiation source that exceeds the threshold, the noise radiation source and the fire Flames can be accurately identified.

For the first detection sensor 29 and the second detection sensor 30, the detection of the degree of contamination of the translucent windows 18 a and 18 b by the test light from the test light source is performed by detecting the light reception from the first detection sensor 29. This is performed using signals. Therefore,
In this embodiment, the first detection sensor 29 is a test light detection detection sensor.

Since the test light from the test light source is a simulated fire light determined to be a flame due to a fire, the test light is applied to the second detection sensor 30 of the first detection sensor 29 during the test. If the function is normal, it is determined that the flame is caused by a fire, so that the function test of the entire fire detector is performed.

FIG. 5 is a circuit block diagram of a fire detector according to the present invention. In FIG. 5, the fire detector 3 is provided with a signal processing unit 32, and the signal processing unit 32 is provided with a right detection unit 33a and a left detection unit 33b. Right detector 3
A sensor section 28a is provided on 3a, and monitors light by entering light from a predetermined monitoring area through the translucent window 18a. The light reception detection signal from the sensor unit 28a is
After being amplified by a, the data is converted into digital data by an A / D converter 35a and taken into the signal processing unit 32.

A test light source control unit 37a is provided in the right side detection unit 33a. The test light source control unit 37a operates when a right side test command is received from the disaster prevention receiver 1, and a test light source 36a using an incandescent lamp, for example. Is emitted at a frequency of, for example, 2 Hz, which is substantially the same as the flicker of the combustion flame, and is emitted through the test light source window 31a, and the test light is emitted through the light transmitting window 18a.
The light is received at a.

The configuration of the right side detection unit 33a is the same as that of the left side detection unit 33b.
An amplifying unit 34b, an A / D converter 35b, a test light source 36b, and a test light source control unit 37b are provided.

The signal processing unit 32 is connected to the disaster prevention receiver 1 via the transmission control unit 38. An address unique to the fire detector 3 is set for the transmission control unit 38 by an address setting unit 39. For example, the disaster prevention receiver 1 transmits a command for a response request for detection data by designating addresses of fire detectors in order at regular time intervals, for example, and the transmission control unit 38 determines whether the address of the command signal matches its own address. If determined, the received command data is transferred to the signal processing unit 32.

The signal processing section 32 sends, for example, data accompanying a fire or a test to the disaster prevention receiving board 1 via the transmission control section 38 in accordance with the received command. The signal processing unit 32
Is provided with a storage unit 40 using a non-volatile memory such as an EEPROM. Initial value data necessary for fire monitoring of the fire detector 3 and light transmitting windows 18a, 1 obtained at the time of the test are provided.
8b can store analog value data indicating the degree of contamination.

The signal processing section 32 is provided with functions of a fire determination section 41 and a test processing section 42. The fire determination unit 41
A fire is determined based on the light reception detection signal output from the sensor unit 28a. Specifically, a fire determination is made based on the relative ratio of the light reception detection signals of the first detection sensor 29 and the second detection sensor 30 shown in FIG.

The test processing section 42 operates when a test execution command is received from the disaster prevention receiver 1. For example, when receiving a right test execution command to the right detecting section 33a, the test processing section 42 operates the test light source control section 37a. Then, the test light source 36a is pulse-driven at, for example, 2 Hz for 2 seconds, and the test light generated by the control of the test light source 36a is transmitted to the test light source window 31.
a through the translucent window 18a.
8a, the light detection signal of the first detection sensor 29 is amplified by the amplifying unit 34a, and is then captured by the A / D converter 35a. This light reception detection signal is synchronized with the change of the test light.
This signal changes at Hz, and has a positive / negative amplitude change corresponding to the received light intensity around 0V.

Based on the light receiving detection signal obtained by receiving the test light, the test processing unit 42 detects the degree of contamination of the translucent window and transmits an analog value signal indicating the degree of contamination of the translucent window. The information is transmitted to the disaster prevention receiver 1 by the unit 38.
In addition, the test processing unit 42 stores, in the storage unit 40, an analog value signal indicating the degree of contamination of the translucent window obtained in the test operation.

The test processing section 42 converts the light transmitting windows 18a, 18a into analog value data indicating the degree of contamination of the light transmitting windows.
The dimming rate representing the dimming of the test light due to the degree of contamination of b is calculated. To calculate the dimming rate, for example, the storage unit 40 stores, as an initial value, the amplitude of the light reception detection signal of the test light detected at a degree at which the translucent window before installation is clean.

Therefore, at the time of the test after the installation of the tunnel, the light is dimmed by the amplitude detection value of the light reception detection signal obtained by the test operation and the amplitude initial value of the light reception detection signal stored in the storage unit 40. Assuming that the ratio = 100- (amplitude detection value / amplitude initial value) × 100 [%], the dimming ratio indicating the degree of contamination is calculated. As a parameter indicating the degree of contamination, the transmittance may be calculated as transmittance = (detected amplitude value / initial amplitude value) × 100 [%] in addition to the dimming rate. In monitoring the actual degree of contamination, it is desirable to calculate the dimming rate because the dimming rate is proportional to the degree of dirt.

In the test processing section 42, the translucent windows 18a, 1
8b, the amplification units 34a, 34a
The sensitivity b is not the compensated sensitivity at that time, but the test operation is performed with the degree of returning to the same sensitivity (initial sensitivity) as when the initial amplitude value of the light reception detection signal stored in the storage unit 40 is detected. Will be.

FIG. 6 is a schematic flowchart of the fire detector processing in the fire detector 3 of FIG. The processing operation of the fire detector 3 performs a fire monitoring process in step S1.
In this state, it is checked in step S2 whether there is a test command from the disaster prevention receiver 1, and if there is a test command, the process proceeds to the test process in step S3.

In this test process, simultaneously with the function test including the calculation of the degree of contamination of the translucent windows 18a and 18b targeted by the present invention, amplification is performed based on the calculated degree of contamination so as to compensate for the decrease in sensitivity. A contamination compensation process for switching the sensitivity of the units 34a and 34b is included.

FIG. 7 is a flowchart showing the details of the test processing in the fire detector in step S3 in FIG.
Normally, the disaster prevention receiver 1 transmits a test execution command to the fire detector 3 side at a predetermined time, for example, once a day while sequentially specifying the detector addresses. The test execution command is sent in the order of the right test execution command and the left test execution command.

In FIG. 7, when a right-side test command is received from the disaster prevention receiver 1 in step S1, step S2
Sets the test mode in which the signal processing unit 32 activates the test processing unit 42, and subsequently, in step S3, sensitivity compensation for returning the sensitivity of the amplifying unit 34a of the right side detection unit 33a to the initial state (state in which the initial amplitude value is stored). A sensitivity switching control signal is output so as to perform resetting.

Next, in step S4, the test light source controller 37a
Is started, and the test light source 36a blinks at, for example, 2 Hz to perform blink control of the right test light source to generate test light. In this state, the sensor unit 28a receives the test light through the translucent window 18a, reads the received light detection signal obtained from the amplifier 34a by the A / D converter 35a, and reads the received light data.

After the reading of the received light data is completed, the right test light source is turned off in step S6. Subsequently, in step S7, for example, a dimming rate is calculated as analog value data indicating the contamination state based on the amplitude detection data calculated from the received light data read in step S5 and the amplitude initial value data stored in the storage unit 40. Then, the dimming rates calculated in step S8 are sequentially stored in the storage unit 40.

Subsequently, in step S 9, the calculated dimming rate is transmitted to the disaster prevention receiver 1 via the transmission control unit 38. When this series of test processing is completed, the sensitivity correction processing based on the dimming rate calculated in step S10 is performed, thereby ending the test processing of the right detection unit 33a.

As sensitivity compensation, for example, when a decrease in sensitivity is detected as a fire detector based on the calculated dimming rate, the sensitivity switching control signal increases the amplification of the amplifier 34a and switches the sensitivity. Do. If the dimming rate is in a range that does not require sensitivity switching, a sensitivity switching control signal is output to return the sensitivity to the value before the test.

Subsequently, a left side test process is performed in step S11. This left side test process repeats the same process as the right side test process of steps S1 to S10, and thus the description thereof is omitted. In this manner, the light transmissive windows 18a and 18b are tested by the test of the right detection unit 33a and the left detection unit 33b.
Is sent to the disaster prevention receiver 1 side and stored by the fire detector itself.

When a fire is judged normally by the emission of the test light, a fire signal is also sent to the disaster prevention receiver together with the extinction rate or at another timing.

FIG. 8 is a flowchart of a detector test operation by the main control unit 6 of the disaster prevention receiver of FIG. 2 for the fire detector 3 of FIG. The process for this test operation is started once a day at a predetermined time, for example, by monitoring a timer.

First, in step S1, the detector address N is set to N.
= 1, the current address N is set in step S2.
Send the right test execution command to When the right test execution command is transmitted, the fire detector at the address N performs the test operation as shown in steps S1 to S10 in FIG. 7, and transmits the dimming rate as analog value data indicating the degree of contamination. .

For this reason, it is checked in step S3 whether or not the extinction rate has been received from the detector at the address N. When the extinction rate is received, it is stored in the storage unit 13 together with the detector address in step S4. Subsequently, in step S5, it is checked whether the received dimming rate is abnormal.

For example, the extinction ratio is 100% or 0%
In the case of an abnormal value (a value that is not normally considered), the process proceeds to step S6, and abnormal processing is performed. The abnormal process includes, for example, a retry process of returning to step S2 and retransmitting the right test execution command to the same address N.

If the received dimming rate is not an abnormal value, the process proceeds to step S7, where it is compared with a predetermined advance warning threshold value of 75%. If the dimming rate is 75% or more, the advance warning (pre-alarm) is set in step S8. Alarm). Then, step S9
Then, the dirt alarm threshold value is compared with the dimming rate of 85%, and if it is 85% or more, a dirt alarm is output in step S10.

[0085] The contamination warning threshold value 85% is determined by the fire detector 3
This is the extinction rate corresponding to the limit of the degree of contamination at which the initial performance as a fire detector cannot be performed even by the sensitivity compensation processing of the above. Therefore, when the dimming rate becomes 85% or more, normal fire monitoring cannot be performed unless the translucent window of the fire detector 3 is cleaned.

Subsequently, a left side test execution command is transmitted to the address N in step S11. Steps S12 to S19 following the transmission of the left test execution command are the same as the processing of steps S3 to S10 when the right test execution command is transmitted. When the processing associated with the right test execution command in steps S11 to S19 is completed, it is checked in step S20 whether or not all the detectors have been tested. If not, the address N is incremented by one in step S21 and step S2 is performed again. Returning to, if the tests on all the detectors have been completed, a series of test processes is completed.

In the detector test operation flowchart shown in FIG. 8, analog value data (dimming rate) indicating the degree of contamination is used as a return signal from the fire detector in response to the transmission of a test command to the fire detector. However, a fire signal is actually returned if the fire detector is normal. When the fire signal is not returned, the main control unit 5 in FIG. 2 displays the test abnormality together with the detector address.

FIG. 9 illustrates the storage structure of the stained analog value signal (dimming rate) stored in the storage unit of the main control unit 5 provided in the disaster prevention receiver of FIG. 2 by the detector test operation of FIG. FIG.

In FIG. 9, the stained analog value storage structure 4
Numeral 3 stores a stain analog value signal Dxy in an area designated by a two-dimensional address A [X, Y] of a detector number X on the horizontal axis and a time code Y indicating a measurement time on the vertical axis. Specifically, the detector number X on the horizontal axis takes a value of X = 001 to m, the time code Y on the vertical axis takes a value of Y = 001 to n,
Dirty analog value signals D11 to Dmn are stored at addresses A [001,001] to A [m, n].

As the stain analog value Dxy, the extinction ratio is obtained as a stain analog value signal for each of the right detector 33a and the left detector 33b for one fire detector 3 as shown in FIG. Therefore, one detector number stores two stain analog values on the left and right. Of course,
If the left and right detectors 33a and 33b are regarded as one detector and stored, the detector number and the stain analog value signal are one-to-one.
Corresponding to

The value of the time code Y on the vertical axis is converted into a measurement date using a conversion table. For example, the time code 001 is converted to “2000/01/01”, and the last time code n is converted to “2000/07/01”.

FIG. 10 shows the CRT 1 of the disaster prevention receiver 1 of FIG.
FIG. 6 is an explanatory diagram of a monitoring screen displayed in a normal monitoring state. This monitoring screen 44 is provided with a display column of "dirt display" following a display column of "automatic notification". For example, the symbol 46-1 corresponds to the fire detector numbers 001 to 016.
46-16 are arranged one-dimensionally, the latest stain analog value signal (dimming rate) stored in the storage unit 12 is read out, and the brightness data is darkened so that the symbols become darker as the stain degree increases. The converted symbol is displayed.

For example, detector numbers 007, 008, 013
Nos. To 016 are white displays with the maximum luminance, and almost no staining occurs. Also, detector numbers 004 to 006, 0
For 09, 010, and 012, it can be seen that the symbol luminance has decreased, and that contamination has started. Further, detector number 0
In the case of 01 to 003 and 011, the symbol luminance is considerably lowered, and it can be seen that the contamination is further advanced.

On the top of the monitoring screen, event information such as the occurrence of a fouling notice, fire, or water discharge is displayed.
Furthermore, an on / off symbol indicating whether or not the equipment installed in the tunnel is operating is displayed.

Here, in the fire detector 3 in which detector numbers 001 to 016 are set, two stained analogs are stored in the storage unit 12 corresponding to the right and left detection units 33a and 33b in FIG. The value signal (dimming rate) is stored.

Therefore, the luminance display of the symbol by the two stained analog value signals is one of the following. (1) The symbol luminance is displayed by the average value of two stained analog value signals. (2) The higher the degree of contamination is selected from the two types of stained analog value signals, and the symbol luminance is displayed. (3) A symbol is divided into two, and each stained analog value signal is displayed with a half symbol for luminance.

FIG. 11 is an explanatory diagram of a stain monitor screen of the CRT 16 according to the first embodiment of the stain display control unit 13 provided in the main control unit 5 of FIG.

On the contamination monitoring screen 48 of FIG. 11, a tunnel 49 is displayed, and for example, 28 symbols 50-1 to 50- shown by small circles corresponding to the installation positions of the fire detectors 3 with respect to the tunnel 49. A symbol row 50 in which the symbols 28 are arranged one-dimensionally is displayed. A start button 51, a primary stop button 52, a stop button 53, and a reproduction scale 54 used for moving image reproduction are arranged below the contamination monitoring screen 48.

Further, at the lower left of the screen, "2000/01/01" which is the start date 54 of the history of the stain analog value signal stored in the storage unit 12 according to the storage structure 43 of FIG.
And the end date 56, which is the latest data, "2000
/ 07/01 "is displayed.

In such a contamination monitoring screen 48, in the initial screen, the contamination display control unit 13 displays the start date 54 in the symbol column 50 of the tunnel 49 in “2000/01/01”.
01 is read from the storage unit 12 and converted into, for example, a 256-level luminance level of black and white to determine and display the luminance of the symbols 50-1 to 50-28.

When the start button 54 is clicked with the mouse in this state, the dirty analog value is read out from the storage unit 12 in units of one day in chronological order, and the brightness is changed to the symbols 50-1 to 50-28. Such a stain-like moving image display based on the history of the stain analog value stored in the storage unit 12 allows the change in the degree of contamination over time of the entire fire detector installed in the tunnel to be properly grasped by a moving image. can do.

For this reason, when a pollution notice or a pollution warning is issued for a specific fire detector, a moving image of the degree of contamination is reproduced for the symbol array 50 on the pollution monitoring screen 48 as shown in FIG. You can immediately determine the degree of contamination of another fire detector installed around the fire detector, and clean only the fire detector that warned or clean the fire detector. It is possible to quickly and easily determine whether to clean the entire tunnel.

FIG. 12 is an explanatory diagram of a stain monitoring screen displayed on the CRT 16 by the second embodiment of the stain display control section 13 provided in the main control section 5 of FIG.

On the contamination monitoring screen 60 shown in FIG. 12, a tunnel 49 is displayed. On the tunnel 49, for example, 28 circles represented by small circles corresponding to the installation positions of the fire detectors 3 in the tunnel are displayed. Are arranged in a one-dimensional manner, and a symbol image 61 is displayed in a two-dimensional array in which symbol rows are vertically arranged in the order of measurement date.

This symbol image 61 has, for example, “2000/06 /
The stained analog signal values for 12 days from "20 to 2000/07/01" are read from the storage unit 12, converted into luminance, and displayed as symbols.

The display period of the symbol image 61 is
By operating the right scroll buttons 63a and 63b, scroll display can be performed in an arbitrary period within the range of the history stored in the storage unit 12.

By displaying the degree of contamination by the symbol image 61 based on the history of the stained analog values stored in the storage unit 12, the contamination of the light-transmitting window of the fire detector proceeds with time. The situation can be accurately captured.

For this reason, when a stain notice or a stain warning is issued for a specific fire detector, as shown in, for example, part A of the display of the symbol image 12, the fire detector having the warning and the surrounding fire detector are displayed. Quickly and easily determine the degree of contamination and quickly and easily determine whether to clean only the fire detector that warned, clean the surrounding fire detectors, or clean the entire tunnel. Can be.

When only a specific symbol is stained as shown in part B of the symbol image 61 and other fire detectors located on both sides of the symbol are not stained, and there is no stain in the previous history, It can be estimated that the fire detector is abnormal due to mud or dirt adhering to the translucent window, and it can be dealt with by cleaning and checking only the fire detector that issued the contamination warning.

Further, when a specific symbol in the symbol image 61 of FIG. 12 is selected with the mouse and clicked,
As shown in FIG. 13, a trend graph (history graph) of the stain analog value signal (dimming rate) stored in the storage unit 12 can be displayed for the fire detector corresponding to the symbol clicked with the mouse.

In this trend graph, the horizontal axis represents the number of days, and the vertical axis represents the extinction rate (%). The right detector of the designated fire detector is indicated by a solid line, and the left detector is indicated by a broken line. Displays the diurnal variation of the light rate. The display of the trend graph can be performed in the same manner for the symbols in the one-dimensional array shown in FIGS.

If necessary, a print request for a stain analog value signal is made by designating the measurement date with the stain monitoring screens 48 and 60 shown in FIG. 11 or 12 open, as shown in FIG. The dimming rate (%) is printed out together with the date and time and the detector number as the stain analog value stored in the storage unit 12.

In the above embodiment, a two-wavelength type fire detector for judging a fire by monitoring two wavelength bands with two detection sensors is taken as an example. However, the present invention is not limited to this. Instead, the present invention can be similarly applied to a one-wavelength system in which one wavelength band is monitored by a detection sensor, a fire detector that monitors three or more wavelength bands to determine a fire, and the like.

When the installed fire detector is removed due to a failure or the like, the storage unit 40 of the fire detector 3 stores analog value data indicating the degree of contamination of the translucent window, for example, light attenuation rate data. Therefore, when analyzing the cause of failure, etc., this is connected and read out by connecting a pseudo receiver, etc., to grasp the dirt change in the actual operation state of the translucent window,
It can also be used to determine the cause of a failure.

In the above-described embodiment, as an analog value indicating the degree of contamination of the translucent window output from the fire detector, the extinction ratio and transmittance data calculated by the fire detector are taken as an example. However, the test light reception detection signal may be directly output as an analog value to the disaster prevention receiver, and the light reduction rate and the transmittance may be calculated on the disaster prevention receiver side. In this case, the initial value is transmitted to the disaster prevention receiver in advance and stored, or is transmitted together with the transmission of the analog value.

In the above embodiment, only the tunnel is described as a space for installing a fire detector and monitoring a fire. However, other spaces in a bad environment, for example, a plant or factory such as a garbage pit, It can also be applied to fire monitoring in mining pits for metals, coal, oil, etc.

Furthermore, in the above-described embodiment, the analog value signal indicating the degree of contamination of the translucent window detected is transmitted to the disaster prevention receiver in the test processing. A special command is sent from the disaster prevention receiver to the fire detector to send an analog value signal indicating the degree of contamination of the translucent window to the fire detector, and stored in the storage unit 40 of the fire detector. Processing for returning a certain analog value signal may be performed.

In the above embodiment, the test light is received by the first detection sensor 29 and the second detection sensor 30, but a dedicated test light detection sensor may be provided. Furthermore, the present invention includes appropriate modifications that do not impair the objects and advantages thereof, and is not limited by the numerical values shown in the embodiments.

[0105]

As described above, according to the present invention, the fire detector outputs an analog value signal indicating the degree of dirt on the translucent window, and stores the analog value signal in the storage unit of the fire receiving board. By reading the contaminated analog value signal and converting it to luminance and displaying the one-dimensional or two-dimensional symbol arrangement, the facility manager can visually grasp the degree of contamination of the fire detector's translucent window throughout the tunnel. It is possible to perform a cleaning work with traffic regulations efficiently by setting an appropriate cleaning plan according to the degree of contamination.

Further, since the history of the degree of contamination of the fire detector is known, the reliability of the contamination alarm can be easily and appropriately determined.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a system configuration of the present invention.

FIG. 2 is a detailed block diagram of the system configuration of FIG. 1;

FIG. 3 is a front view of a fire detector according to the present invention.

FIG. 4 is a sectional view of the internal structure of a fire detector according to the present invention.

FIG. 5 is a circuit block diagram of a fire detector according to the present invention.

FIG. 6 is a flowchart of a processing operation of the fire detector of FIG. 5;

FIG. 7 is a flowchart showing details of the test processing of FIG. 6;

FIG. 8 is a flowchart of a processing operation of the disaster prevention receiver of FIG. 2;

9 is an explanatory diagram of a storage structure of a stain analog value signal in a storage unit of the disaster prevention receiver of FIG. 2;

FIG. 10 is an explanatory diagram of a symbol display of a stain analog value signal displayed on a monitoring screen of normal monitoring in the disaster prevention receiver of FIG. 2;

FIG. 11 is an explanatory diagram of a second embodiment of the stain display control unit shown in FIG. 2, which converts a stain analog value signal into brightness and displays symbol brightness in a one-dimensional array of symbol columns.

FIG. 12 is a diagram showing a symbol analog luminance signal displayed on a two-dimensional array of symbol images by converting a stained analog value signal into luminance.
Of the first embodiment of the stain display control unit of FIG.

FIG. 13 is an explanatory diagram of a trend graph of the degree of contamination displayed on the disaster prevention receiver of FIG. 2;

FIG. 14 is an explanatory diagram of the analog data of the degree of fouling emitted by the printer of the disaster prevention receiver of FIG. 2;

[Explanation of symbols]

 1: Disaster prevention receiving panel 2: Transmission path 3: Fire detector 3a: Cover 3b: Main body 4: Tunnel 4a: Tunnel wall 5: Main control section 6: Transmission control section 7: Relay amplification panel 8: Operation stain display control section 9 : Display unit 10: operation unit 11: sound unit 12: storage unit 13: stain display control unit 14: printer 15: communication control unit 16: CRT 18 a, 18 b: translucent window 19: test light source storage unit 20: waterproof connector 21: Signal cable 22: Mounting screw 23: Mold cover 24: Lightning arrester 25: Signal line 26: Main circuit board 28a, 28b: Sensor unit 29: First detection sensor 30: Second detection sensor 31a, 31b: For test light source Window 32: Signal processing unit 33a: Right side detection unit 33b: Left side detection unit 34a, 34b: Amplifier unit 35a, 35b: A / D converter 36a, 36b: Test light source 37a 37b: Test light source control unit 38: Transmission control unit 39: Address setting unit 40: Storage unit 41: Fire determination unit 42: Test processing unit 44: Monitoring screen 46-1 to 46-16: Symbol 48, 60: Soil monitoring screen 49: Tunnel 50: Symbol sequence (one-dimensional) 50-1 to 50-16: Symbol 51: Start button 52: Primary stop button 53: Stop button 54: Reproduction scale 54: Start date 56: End date 61: Symbol image (symbol image) 62: Measurement date 63a, 63b: Scroll button

Claims (11)

[Claims] 1. A disaster prevention monitoring system in which a plurality of optical fire detectors are connected to a transmission line drawn from a disaster prevention receiver, wherein the optical fire detector has a light-transmitting element in which a fire detection sensor is disposed. A signal processing unit that detects the degree of contamination of the window and transmits a contamination analog value signal, wherein the disaster prevention receiver receives the contamination analog value signal transmitted from the optical fire detector and divides the signal for each detection time And a stain display control unit that converts the stain analog value into a symbol brightness and displays the symbol brightness. 2. The disaster prevention monitoring system according to claim 1, wherein the contamination display control unit displays a plurality of fire detector symbols in a one-dimensional array according to an installation position, and stores an arbitrary symbol from the storage unit. A disaster prevention monitoring system characterized by reading a stained analog value signal of a detection time, converting the signal into luminance of a corresponding symbol, and displaying the symbol. 3. The disaster prevention monitoring system according to claim 1, wherein the display unit sequentially reads a history of the stained analog value signal stored in the storage unit, converts the history into a luminance of a corresponding symbol, and displays the moving image. Disaster prevention monitoring system characterized by displaying. 4. The disaster prevention monitoring system according to claim 1, wherein the display unit displays a plurality of fire detector symbols in a two-dimensional array with axes indicating the installation position and the detection time. A disaster prevention monitoring system wherein a history of a stain analog value signal stored in a storage unit is read out, converted into luminance of a corresponding symbol, and displayed. 5. The disaster prevention monitoring system according to claim 1, wherein the stain display control unit is stored in the storage unit when detecting a click operation on an arbitrary display symbol. A disaster prevention monitoring system characterized by reading a history of a corresponding stain analog value signal and displaying a trend graph. 6. The disaster prevention monitoring system according to claim 1, wherein the optical fire detector comprises: a light-transmitting window having a predetermined monitoring area as a field of view; A detection sensor that converts energy into an electric signal and outputs it as a light reception detection signal; a fire determination unit that determines a fire based on the light reception detection signal output from the detection sensor; A test light source provided, and a detection sensor for test light detection, which is arranged in the translucent window and converts light energy into an electric signal and outputs the signal as a light reception detection signal, wherein the signal processing unit Via the light transmitting window, the test light emitted from the test light source is received by the test light detecting detection sensor through the light transmitting window, and at least the contamination degree of the light transmitting window is detected and detected by the light receiving signal. Before Disaster prevention monitoring system, characterized in that to transmit the fouling analog value signal indicating a degree of contamination of the translucent window to the outside. 7. A disaster prevention receiver in which a plurality of optical fire detectors are connected to a transmission line led out to the outside, wherein a contamination analog value signal transmitted from the optical fire detector is received and detected every detection time. A disaster prevention receiver comprising: a storage unit that stores the image data separately; and a stain display control unit that converts the stain analog value into the brightness of a symbol and displays the symbol brightness. 8. The disaster prevention receiver according to claim 7, wherein the contamination display control unit displays a plurality of fire detector symbols in a one-dimensional array in accordance with the installation position, and stores an arbitrary symbol from the storage unit. A disaster prevention receiver which reads out a stained analog value signal of a detection time, converts the signal into luminance of a corresponding symbol, and displays it. 9. The disaster prevention receiver according to claim 7, wherein the display section sequentially reads a history of the stained analog value signal stored in the storage section, converts the history into a luminance of a corresponding symbol, and converts the history into a moving image. Disaster prevention receiver characterized by displaying. 10. The disaster prevention receiver according to claim 7, wherein the display unit displays a plurality of fire detector symbols in a two-dimensional array with axes indicating the installation position and the detection time.
A disaster prevention receiver that reads a history of a stained analog value signal stored in the storage unit, converts the history into the brightness of a corresponding symbol, and displays it. 11. The disaster prevention receiver according to claim 7, wherein the stain display control unit is stored in the storage unit when detecting a click operation on an arbitrary display symbol. Disaster prevention receiver characterized by reading the history of the corresponding dirty analog value signal and displaying a trend graph.