JP4633915B2 - Disaster prevention reception board - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disaster prevention receiver that is connected to a plurality of optical fire detectors installed to monitor fires in adverse environments such as tunnels. The present invention relates to a disaster prevention receiver having a function of monitoring the degree of contamination of a light window.
[0002]
[Prior art]
Conventionally, for example, a plurality of fire detectors that detect fires in a tunnel are installed at regular intervals on the wall or ceiling of the tunnel, and each fire detector is located at both sides in the tunnel longitudinal direction, at least adjacent to the fire detector. A fire in the area up to the vessel is detected. As such a fire detector, a fire is detected using a light receiving element that receives light from a flame or radiant heat, and a fire signal is sent to a disaster prevention receiving board.
[0003]
As a method for detecting a fire, a method for detecting whether the output level of light reception energy in a specific wavelength band is equal to or greater than a threshold value, or a two-wavelength type for determining fire by comparing the output levels of light reception energy in a plurality of wavelength bands, 3 There is a wavelength type. In order to detect fires on both the left and right sides with respect to the installation position, the fire detector detects the fire with separate light receiving elements on the left and right.
[0004]
Since such a fire detector is installed in a tunnel through which cars frequently pass, it is placed in a housing so that the light receiving element is not broken or dirty, and light is transmitted to the front of the light receiving element. Windows are provided. However, in the tunnel, pollutants that cause dirt such as smoke, dust, earth and sand, and chemical substances such as antifreezing agents are floating in the tunnel. When attached to the fire detector, the light receiving output of the light receiving element is reduced.
[0005]
Therefore, a test light source is provided outside the translucent window of the fire detector, periodically emits light, and is received by the light receiving element inside the translucent window, thereby detecting the degree of fouling of the translucent window. When the degree of contamination is exceeded, a contamination signal is transmitted to the disaster prevention reception board. The fire detector adjusts the sensitivity according to the level of the received light output at the time of the test, and performs sensitivity compensation according to the degree of contamination of the translucent window.
[0006]
When the facility manager receives a pollution signal from the disaster prevention reception board and outputs a pollution warning, the facility manager gives an instruction to clean the light-transmitting window of the fire detector to the cleaning company. Since such a cleaning operation involves traffic regulation in the tunnel, it is desirable that the cleaning operation can be performed on a fire detector having a large degree of contamination in addition to a fire detector that has issued a contamination signal.
[0007]
However, the contamination signal from the conventional fire detector is an ON / OFF signal that is output only when the degree of contamination of the translucent window exceeds a predetermined value. It is impossible to grasp the degree of contamination of the surrounding fire detectors, and it is sufficient to clean only the fire detector that issued the contamination signal. It was difficult to determine whether to clean.
[0008]
If the overall degree of contamination of the fire detector is known, it is possible to determine the appropriate cleaning time, but it is difficult at present. In addition, when a pollution signal is issued, there is a problem that the facility manager cannot judge the probability of the contamination signal even if there is a contamination signal because the history of the previous pollution situation is not known at all. .
[0009]
In order to solve this problem, the inventor of the present application sends a test command from the disaster prevention receiving board once a day to transmit a fire signal by a test operation (normal time), and during this test operation, the test light source The degree of contamination of the translucent window, for example, the light reduction rate, is detected from the received light detection signal obtained by receiving the test light transmitted from the test light detection sensor through the translucent window. An optical fire detector is proposed in which an analog value signal indicating the degree of fouling of a sexual window is transmitted to a disaster prevention receiver (Japanese Patent Application No. 2000-228331).
[0010]
In this way, the disaster prevention reception panel that has received the analog value of the contamination due to the test operation of the optical fire detector outputs a contamination notice when the contamination analog value signal reaches a certain level, for example, the dimming rate is 75%. When a fire detector reaches a level at which the fire detection capability cannot be compensated for dirt, for example, a dimming rate of 85%, a pollution alarm is output.
[0011]
For this reason, the facility manager can grasp the degree of contamination of all fire detectors at the disaster prevention reception board, centrally manage the degree of contamination of the entire tunnel, and make an appropriate cleaning plan according to the degree of contamination It becomes.
[0012]
[Problems to be solved by the invention]
However, the fouling analog signal received by the disaster prevention receiver in a test operation once a day for the optical fire detector has a relatively large variation. Therefore, it is necessary to correct the average value of a plurality of past times to suppress variations. However, the contamination analog value signal corrected to the average value has a problem that a delay remains with respect to a change in the actual contamination analog value signal.
[0013]
For example, even if the contamination analog value signal recovers to near 0% in terms of dimming rate by cleaning the fire detector, the cleaning result immediately follows the contamination analog value signal because it is the average value with the contamination analog value before cleaning. Does not appear. In addition, even when the fouling analog value signal is close to 100% in terms of light attenuation due to an abnormality in the detector, there is a problem that the abnormality cannot be immediately displayed due to a delay because it is corrected to the average value. In the test of the fire detector, the tester covers the translucent window with his hand and performs a test operation to test whether the fire detector outputs abnormally. In this case as well, the average is corrected. The abnormal signal does not appear immediately and the test must be performed several times.
[0014]
For this reason, the test cannot be performed quickly, and the tester is confused.
[0015]
It is an object of the present invention to provide a disaster prevention receiver that can correctly determine the degree of contamination without delay when cleaning the fire detector or when it is abnormal even if it is corrected to the average value of the contamination analog value signal. And
[0016]
[Means for Solving the Problems]
In order to achieve this object, the present invention is configured as follows. The present invention is a disaster prevention reception panel in which a plurality of optical fire detectors are connected to a transmission line drawn outside, and a translucent window transmitted along with a test operation of the optical fire detector according to a test command. The contamination monitoring unit that receives and monitors the contamination analog value signal indicating the contamination degree, and the range of the contamination analog value signal indicate the cleaning state of the translucent window. The degree of fouling is below a predetermined value Translucent light that cannot be compensated for cleaning area and / or detector capacity sex An abnormal area that indicates the window's contamination status is set, and outside the cleaning area or abnormal area, the received analog analog signal is corrected to an average value and output to the contamination monitoring unit. And a correction processing unit that outputs the analog signal to the contamination monitoring unit as it is without correcting it to an average value.
[0017]
Here, the fouling analog value signal is the light reduction rate of the translucent window, the cleaning region is a region where the light reduction rate is less than 30%, for example, and the abnormal region is a region where the light attenuation rate is over 95%, for example.
[0018]
The disaster prevention reception board of the present invention sends a test command to the optical detector once a day to perform a test operation, and the correction processing unit detects that the received contamination analog value signal is out of the cleaning area and abnormal area. In this case, for example, the average value is corrected for three times.
[0019]
As described above, according to the present invention, the average process is not performed in the cleaning area or the abnormal area, so that it is possible to perform display or determination for monitoring the contamination without delay when cleaning or the detector is abnormal.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory diagram of a schematic configuration of a disaster prevention monitoring system for tunnels according to the present invention.
[0021]
In FIG. 1, a transmission path 2 is drawn out from a disaster prevention receiver 1 installed in a monitoring room or the like toward the tunnel 5, and the fire detector 3 of the present invention is connected to the transmission path 2 in the longitudinal direction of the tunnel 5. Are installed at regular intervals L.
[0022]
The fire detector 3 is installed on the tunnel wall surface 5a or the ceiling surface of the roadway of the tunnel 5, and each fire detector 3 monitors the sections on both sides along the tunnel longitudinal direction.
[0023]
For this reason, when a fire occurs in a certain section due to a vehicle accident or the like and the fire source 4 is generated, the fire detectors 3 located on both sides of the section are monitored in duplicate. The fire detector 3 of the table detects a fire and sends a fire detection signal to the disaster prevention reception board 1.
[0024]
In response to this, the disaster prevention reception panel 1 determines the section where the fire has occurred from the fire detection signal of the fire detector, for example, a fire has occurred in the water spray head of the water spray facility installed on the ceiling surface side of the tunnel 5 The water spray automatic valve is activated and controlled for the section to spray fire-fighting water.
[0025]
FIG. 2 is a block diagram of a detailed configuration of the disaster prevention monitoring system of FIG. In FIG. 2, the disaster prevention receiving board 1 is provided with a main control unit 6, and a transmission control unit 7 is provided for the main control unit 6. A transmission path 2 is drawn from the transmission control unit 7 to the tunnel 5, and a plurality of fire detectors 3 installed in the tunnel 5 are connected. A relay amplifier board 8 is provided in the middle of the transmission path 2 in the tunnel 5 to relay and amplify the transmission signal between the disaster prevention receiver board 1 and the fire detector 3.
[0026]
An operation display control unit 9 is provided for the main control unit 6 of the disaster prevention receiving board 1 via a bus, and a display unit 10, an operation unit 11 and an acoustic unit 12 are connected to the operation display control unit 9. is doing.
[0027]
In addition to the fire reception control function, the main control unit 6 is provided with a storage monitoring unit 100, a correction processing unit 102, a storage unit 104 using an SRAM, and the like. The stain monitoring unit 100 receives a stain analog value signal transmitted along with a test operation of the fire detector 3 by a test instruction once a day, for example, once a day, and monitors the stain degree.
[0028]
The monitoring of the degree of contamination by the contamination monitoring unit 100 is performed when a received contamination analog value signal reaches 75% in terms of dimming rate, and a contamination notification is issued. Further, the fire detector 3 cannot compensate the fire detection capability, for example, dimming When the rate reaches 85%, a pollution warning is issued. Further, the degree of contamination is displayed and stored, and printed as necessary.
[0029]
The correction processing unit 102 obtains and corrects, for example, an average value for the past three times in order to suppress variations in the received dirty analog value signal. In addition, the correction processing unit 102 has a cleaning area indicating a signal range in a cleaning state of the translucent window and a transparency that the detector capability cannot compensate for the range (range) of the fouling analog value signal with the light attenuation rate of 0 to 100%. An abnormal area that is a signal range indicating the contamination state of the light window is set, and when the value of the received dirty analog signal is outside the cleaning area and abnormal area, the received dirty analog signal and the previously received dirty analog signal The average value is calculated and corrected, and the contamination analog signal is not corrected to the average value in the cleaning region and the abnormal region, and is left as it is.
[0030]
For example, the cleaning area of the contamination analog value signal is an area where the light attenuation rate is less than 30%, and the abnormal area is an area where the light attenuation rate exceeds 95%, for example. As a result, the contamination analog value signal in the cleaning region or the abnormal region is output to the contamination monitoring unit 100 as it is without being corrected to an average value, and is monitored and judged, and further stored, displayed, printed, and the like.
[0031]
The storage unit 104 stores the dirty analog value signal corrected by the correction processing unit 102 as history data. Further, a printer 14 is provided for the main control unit 6 via a bus so that various data necessary for monitoring control of the disaster prevention receiving panel 1 can be printed out.
[0032]
Further, an external CRT 16 is connected to the main control unit 6 via the communication control unit 15 so that various reception information necessary for monitoring control of the disaster prevention receiving panel 1 can be displayed on the CRT 16. Yes.
[0033]
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 is composed of a cover 3a and a main body 3b. Translucent windows 18a and 18b are arranged on the inclined surfaces formed on the left and right sides of the cover 3a, respectively. , 18b each has a built-in two-wavelength detection sensor.
[0034]
A test light source storage unit 19 is provided above the translucent windows 18a and 18b, and a test light source that will be clarified in the following description is provided at the left and right positions of the lower surface. The cover 3a is fixed to the main body 3b by mounting screws 22 provided at three locations. The signal cable 21 for the fire detector 3 is connected by a waterproof connector 20.
[0035]
Such a fire detector 3 of the present invention is attached to a separately prepared storage box, and the degree of projecting of the translucent windows 18a and 18b and the test light source storage part 19 from the front panel of the storage box to the front of the box. And it is attached to the tunnel wall surface by the storage box.
[0036]
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 composed of a cover 3a and a main body 3b, and a partition cover 23 is provided and partitioned. The signal line 25 from the receptacle side of the waterproof connector 20 provided on the main body 3 b is connected to a lightning protection board 24 attached to the lower part of the mold cover 23.
[0037]
A main circuit board 26 is fixed in a space formed by the mold cover 23 and the cover 3a. In the main circuit board 26, the sensor portions 28a and 28b are arranged with an inclination angle of about 45 ° relative to the translucent windows 18a and 18b arranged on the inclined surface of the cover 3a.
[0038]
Each of the sensor units 28a and 28b is provided with a first detection sensor 29 and a second detection sensor 30, and in this embodiment, the light reception of each of the first detection sensor 29 and the second detection sensor 30 is provided. Fire flames are monitored by a two-wavelength system that distinguishes fire flames and other noise radiation sources based on the detected output.
[0039]
Test light source windows 31a and 31b are provided on both sides of the lower surface of the test light source housing 19 projecting from the cover 3a, and the test light emitted by the built-in test light source is transmitted through the corresponding translucent windows 18a and 18b. By irradiating the first and second detection sensors 29 and 30 of the sensor units 28a and 28b, a function test including detection of the degree of contamination of the translucent windows 18a and 18b can be determined.
[0040]
Here, the first detection sensor 29 detects the CO during flammable combustion. ₂ The radiated light is detected by the narrow-band bandpass filter characteristic with the center wavelength of approximately 4.5 μm, which is the wavelength band due to the resonance radiation. On the other hand, the second detection sensor 30 has a detection characteristic of radiated light obtained with a band-pass filter characteristic of approximately 5.0 to 7.0 μm.
[0041]
Specifically, by using sapphire glass for the translucent windows 18a and 18b of the fire detector 3, a high cut characteristic that cuts light exceeding a wavelength of 7.0 μm is set, whereby the translucent windows 18a, The light that has passed through 18b has a wavelength of 7.0 μm or less and is incident on the first and second detection sensors 29 and 30.
[0042]
The detection window of the first detection sensor 29 itself is provided with an optical wavelength filter constituting a narrow band-pass filter characteristic with a center wavelength of 4.5 μm. The detection window of the second detection sensor 30 is provided with an optical wavelength filter having a broadband band-pass filter characteristic that transmits light having a wavelength of 5.0 μm or more.
[0043]
Therefore, the first detection sensor 29 is the CO generated during the flammable combustion with the center wavelength of 4.5 μm. ₂ The narrow band light of approximately 4.5 μm is detected by the resonance radiation. In contrast, the second detection sensor 30 detects light having a wavelength band of approximately 5.0 to 7.0 μm.
[0044]
As a result, the flames caused by fire are more accurate than the spectrum of combustion flames against sunlight as a noise radiation source, the spectrum of 300 ° C low-temperature radiators generated by engine heating of vehicles traveling in tunnels, and the spectrum of human bodies. Can be identified and detected. Specifically, the detection output of each of the first detection sensor 29 and the second detection sensor 30 is experimentally measured for a combustion flame and other noise radiation sources such as sunlight, a low-temperature radiator such as a vehicle engine, a human body, and the like. By determining the relative ratio, setting a threshold for the relative ratio that can distinguish between the combustion flame and the noise radiation source, and detecting a radiation source that exceeds the threshold, it is determined that the flame is due to a fire. The flame can be accurately identified.
[0045]
For the first detection sensor 29 and the second detection sensor 30, the degree of contamination of the translucent windows 18 a and 18 b by the test light from the test light source is detected using a light reception detection signal from the first detection sensor 29. Do it. Therefore, in this embodiment, the first detection sensor 29 is a test light detection sensor.
[0046]
Since the test light from the test light source is a pseudo fire light that is 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 at the time of the test. If it is normal, it is determined that the flame is caused by a fire, so that the function test of the fire detector as a whole is performed.
[0047]
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 a right detection unit 33 a and a left detection unit 33 b are provided for the signal processing unit 32. The right side detection unit 33a is provided with a sensor unit 28a, which monitors by entering light from a predetermined monitoring area through the translucent window 18a. The light reception detection signal from the sensor unit 28 a is amplified by the amplification unit 34 a, converted to digital data by the A / D converter 35 a, and taken into the signal processing unit 32.
[0048]
Further, the right light detection unit 33a is provided with a test light source control unit 37a, and operates the test light source control unit 37a when a right test command is received from the disaster prevention receiving board 1, for example, the test light source 36a using an incandescent lamp is used as a combustion flame. For example, test light generated by blinking or flickering at a frequency of 2 Hz, for example, is transmitted through the test light source window 31a, and the test light is received by the sensor unit 28a through the translucent window 18a. I am doing so.
[0049]
The configuration of the right side detection unit 33a is the same as that of the left side detection unit 33b, and includes a sensor unit 28b, an amplification unit 34b, an A / D converter 35b, a test light source 36b, and a test light source control unit 37b.
[0050]
The signal processing unit 32 is connected to the disaster prevention receiving board 1 via the transmission control unit 38. An address unique to the fire detector 3 is set by the address setting unit 39 for the transmission control unit 38. For example, the disaster prevention reception board 1 transmits the command for requesting response of detection data by sequentially specifying the address of the fire detector at regular time intervals, and the transmission control unit 38 matches the self address from the address of the command signal. When the determination is made, the received command data is delivered to the signal processing unit 32.
[0051]
The signal processing unit 32 sends data associated with, for example, a fire or a test to the disaster prevention receiving panel 1 via the transmission control unit 38 in accordance with the received command. The signal processing unit 32 is provided with a storage unit 40 using a nonvolatile memory such as an EEPROM. The initial value data necessary for fire monitoring of the fire detector 3 and the transparent windows 18a and 18b obtained at the time of the test are provided. Analog value data indicating the degree of contamination can be stored.
[0052]
The signal processing unit 32 is provided with functions of a fire determination unit 41 and a test processing unit 42.
The fire determination unit 41 determines a fire based on the light reception detection signal output from the sensor unit 28a. Specifically, fire determination is performed 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.
[0053]
The test processing unit 42 operates when a test execution command is received from the disaster prevention reception board 1. For example, when receiving the right test execution command for the right detection unit 33 a, the test processing unit 42 operates the test light source control unit 37 a to perform the test. For example, the light source 36a is pulse-driven at 2 Hz for 2 seconds, and the test light generated by the control of the test light source 36a is transmitted through the test light source window 31a and detected by the sensor unit 28a through the light-transmitting window 18a. Then, the light reception detection signal of the first detection sensor 29 is amplified by the amplifying unit 34a and then captured by the A / D converter 35a. This light reception detection signal is a signal that changes at 2 Hz in synchronization with the change of the test light, and has a positive and negative amplitude change according to the light reception intensity centered on 0V.
[0054]
Based on the received light detection signal obtained by receiving the test light, the test processing unit 42 detects the degree of contamination of the translucent window, and the transmission control unit 38 generates an analog value signal indicating the degree of contamination of the translucent window. Send to disaster prevention reception board 1. Further, the test processing unit 42 stores an analog value signal indicating the degree of contamination of the translucent window obtained by the test operation in the storage unit 40.
[0055]
The test processing unit 42 calculates a dimming rate representing the attenuation of the test light due to the degree of contamination of the translucent windows 18a and 18b as analog value data indicating the degree of contamination of the translucent windows.
In order to calculate the light attenuation rate, for example, the amplitude of the light reception detection signal of the test light detected with a degree of contamination of the translucent window before installation is stored in the storage unit 40 as an initial value.
[0056]
Therefore, at the time of testing after tunnel installation, 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,
Dimming rate = 100− (amplitude detection value / amplitude initial value) × 100 [%]
As a result, a dimming rate indicating the degree of fouling is calculated. In addition to the light attenuation rate, the transmission rate is a parameter that represents the degree of contamination.
Transmittance = (Amplitude detection value / Amplitude initial value) × 100 [%]
May be calculated as In the actual monitoring of the degree of contamination, it is desirable to calculate the light attenuation rate because the light attenuation rate is proportional to the degree of contamination.
[0057]
When the test processing unit 42 determines the degree of contamination of the translucent windows 18a and 18b, the sensitivity of the amplification units 34a and 34b is not the compensated sensitivity at that time, but the light reception stored in the storage unit 40. The test operation is performed with the degree of return to the same sensitivity (initial sensitivity) as when the amplitude initial value of the detection signal was detected.
[0058]
FIG. 6 is a schematic flowchart of the fire detector process in the fire detector 3 of FIG. The processing operation of the fire detector 3 performs a fire monitoring process in step S1, checks in this state whether or not there is a test command from the disaster prevention receiving board 1 in step S2, and if there is a test command, step S3. Proceed to the test process.
[0059]
In addition to the transmission of the fire detection signal by the test light, this test processing is performed at the same time as the functional test including the calculation of the degree of contamination of the translucent windows 18a and 18b targeted by the present invention, and the sensitivity based on the calculated degree of contamination. A contamination compensation process for switching the sensitivity of the amplifying units 34a and 34b so as to compensate for the decrease in the frequency is included.
[0060]
FIG. 7 is a flowchart showing details of the test process in the fire detector in step S3 of FIG. Usually, the disaster prevention receiving board 1 transmits a test execution command, for example, once a day at a predetermined time while sequentially specifying detector addresses to the fire detector 3 side. This test execution command is sent in the order of the right test execution command and the left test execution command.
[0061]
In FIG. 7, when the right test command is received from the disaster prevention receiving board 1 in step S1, the test mode in which the signal processing unit 32 activates the test processing unit 42 is set in step S2, and then the right detection unit 33a is set in step S3. A sensitivity switching control signal is output so as to reset the sensitivity compensation to return the sensitivity of the amplifier 34a to the initial state (the state in which the initial amplitude value is stored).
[0062]
Next, in step S4, the test light source control unit 37a is activated to perform blinking control of the right test light source that blinks the test light source 36a at, for example, 2 Hz to generate test light. In this state, the sensor unit 28a (first detection sensor 29) receives the test light through the translucent window 18a, receives the light reception detection signal obtained from the amplification unit 34a by the A / D converter 35a, and receives the light reception data. Is read.
[0063]
When the received light data has been read, the right test light source is turned off in step S6. Subsequently, in step S7, for example, a light attenuation rate is calculated as analog value data indicating the degree of contamination based on the amplitude detection data calculated from the light reception data read in step S5 and the amplitude initial value data stored in the storage unit 40. Then, the dimming rate calculated in step S8 is sequentially stored in the storage unit 40.
[0064]
Subsequently, in step S9, 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 compensation processing based on the light attenuation rate calculated in step S10 is performed, thereby terminating the test processing of the right detection unit 33a.
[0065]
As sensitivity compensation, for example, when a decrease in sensitivity is detected as a fire detector based on the calculated dimming rate, the amplification degree of the amplifying unit 34a is increased by a sensitivity switching control signal and sensitivity switching is performed. When the dimming rate is in a range that does not require sensitivity switching, a sensitivity switching control signal is output so as to return to the sensitivity before the test.
[0066]
Subsequently, a left side test process is performed in step S11. Since the left side test process repeats the same process as the right side test process of steps S1 to S10, the contents thereof are omitted. In this way, the dimming rate indicating the degree of fouling of each of the translucent windows 18a, 18b is sent to the disaster prevention receiver 1 side by the test of the right side detection unit 33a and the left side detection unit 33b, and is stored by the fire detector itself. Will be.
[0067]
In addition, when a fire is judged normally by the emission of the test light, a fire signal is also sent to the disaster prevention reception board together with the light reduction rate or at another timing.
[0068]
FIG. 8 is a flowchart of the contamination monitoring process by the main control unit 6 of the disaster prevention reception board of FIG. 2 for the fire detector 3 of FIG. This contamination monitoring process is performed using a test operation associated with a test command issued by the disaster prevention receiver to the fire detector, and is activated once a day by a timer monitoring or the like at a predetermined time.
[0069]
First, after the detector address N is initialized to N = 1 in step S1, a right test execution command to the current address N is transmitted in step S2. When this right test execution command is transmitted, the test operation is performed as shown in steps S1 to S10 in FIG. 7 by the fire detector at address N, and the dimming rate is transmitted as analog value data indicating the degree of contamination. .
[0070]
For this reason, whether or not the light attenuation rate is received from the detector at the address N is checked in step S3. When the light attenuation rate is received, correction processing is performed in step S4. This correction process will be described in detail with reference to the flowchart of FIG.
[0071]
If a fire signal is transmitted from a fire detector that has performed a test operation in response to a test command, the main control unit 6 determines that it is normal, and if it does not transmit a fire signal, the main control unit 6 determines that it is abnormal. The test abnormality is displayed together with the detector address, but this point is omitted.
[0072]
When the correction process in step S4 is completed, the analog value data is stored in the storage unit 13 together with the detector address in step S5. Subsequently, in step S6, it is checked whether or not the received dimming rate is abnormal.
[0073]
For example, in the case of an abnormal value (a value that is not normally considered) such that the light attenuation rate is 100% or 0%, the process proceeds to step S7 and an abnormal process is performed. This abnormal process includes, for example, a retry process for returning to step S2 and retransmitting the right test execution command to the same address N.
[0074]
If the received dimming rate is not an abnormal value, the process proceeds to step S8, where it is compared with a predetermined warning threshold 75%. If the dimming rate is 75% or higher, a warning (pre-alarm) is issued in step S9. Do. Subsequently, in step S10, the contamination warning threshold value 85% is compared with the dimming rate, and if it is 85% or more, a contamination warning is output in step S11.
[0075]
This contamination alarm threshold value 85% is a light attenuation rate corresponding to the limit degree of contamination that prevents the initial performance as a fire detector from being obtained even by the sensitivity compensation processing of the fire detector 3. Therefore, when the light reduction rate is 85% or more, normal fire monitoring cannot be performed unless the dirt on the light-transmitting window of the fire detector 3 is cleaned.
[0076]
Subsequently, the left test execution command is transmitted to the address N in step S12, and the same processing as steps S3 to S11 when the right test execution command is transmitted is repeated. When the process associated with the right test execution command in step S12 is completed, it is checked in step S13 whether or not all the detectors have been tested. If not completed, the address N is incremented by 1 in step S14 and the process returns to step S2. If all the detectors have been tested, the series of test processes is terminated.
[0077]
FIG. 9 is a flowchart of the fouling analog value correction process of the present invention in step S4 of FIG. In the fouling analog value correction process, the fouling analog value a from the fire detector received in step S1 is first read, and history data processing is performed in the next step S2.
[0078]
In this embodiment, the average value is calculated from the past three analog values, and three values of the current value d [0], the previous value d [1], and the previous time value d [2] are used as history data. Is set to the current value d [0], the current value d [0] and the previous value d [1] at this time are shifted one time in the past, d [2] is discarded.
[0079]
Next, in step S3, it is checked whether or not the analog value a fetched in step S1 is a cleaning area. Here, the cleaning area is set to be less than 30%. If the fouling analog value a is outside the cleaning area, that is, if the light attenuation rate is 30% or more, the process proceeds to step S4 to check whether the area is an abnormal area.
[0080]
In this embodiment, the abnormal region is set in a range exceeding the light attenuation rate of 95%. If it is not in the abnormal region in step S4, the process proceeds to step S5, and an average value of the three analog values d [0], d [1] and d [2] held as history data in step S2 is calculated and corrected. In step S7, the fouling analog value y is output.
[0081]
On the other hand, when there is almost no dirt like after cleaning the fire detector in step S3 and the fouling analog value a taken in step S1 is in a cleaning area with a light attenuation rate of less than 30%, the process proceeds to step S6. The current value d [0] is used as the corrected analog fouling value y, and is output in step S7.
[0082]
Also, if the contamination analog value a is in the abnormal region exceeding 95% in step S4, the current value d [0] in the abnormal region is corrected as it is as the contamination analog value y in step S6. Output in S7.
[0083]
FIG. 10 shows the change of the degree of contamination (dimming rate) obtained by the contamination analog value correction processing of FIG. 9 with respect to the elapsed days. In order to simplify the explanation, a case where a test command is issued once every five days and measured is taken as an example.
[0084]
First, on the first day when the number of elapsed days is 0, the fire detector is less contaminated, the contamination level of the original data 60 is 13%, and the next 5th day is 26%, both in the cleaning area of less than 30%. is there. In this case, in the present invention, the original data 60 is directly used as the correction data 50 without being corrected to the average value of the past three times, and the original data 60 and the correction data 50 coincide with each other in the cleaning area. Yes. On the other hand, if the cleaning area is corrected to the average value of the past three times, the original data 60 is delayed as in the case of the average data 70 of the three times.
[0085]
The fouling degree on the 15th day, which is the third from the first day, is 34%, which exceeds the cleaning area. For this reason, the three-time average data 70 of the past three original data 60 is corrected, and the corrected contamination degree is 25% close to the limit of the cleaning area. Hereinafter, when the original data 60 is between the cleaning area and the abnormal area, the average data 70 corrected to the average value of the past three times of the original data 60 is output, and the variation with respect to the change of the original data 60 is varied. I'm getting suppressed data.
[0086]
When the number of days elapsed passes the 50th day and reaches the 55th day, the corrected three-time average data 70 exceeds 75% of the degree of contamination. Therefore, the 55th day, the 60th day, the 65th day, the 70th day, the 75th day A warning warning will be given continuously during each eye test. For this reason, the facility manager looks at the warning warning and arranges the cleaning of the fire detector.
[0087]
In this case, the original data 60 exceeds the attenuation rate of 85%, which is the threshold value for the contamination alarm for the second time on the 55th day and the 75th day, and if the average is not taken three times, a contamination alarm is issued here. As a matter of fact, by taking the average of three times, it is stopped in the notice of pollution.
[0088]
On the 80th day, there is an initial degree of contamination after cleaning, the original data 60 has recovered to 0%, and since it is in the cleaning area, the average is not performed three times, and the original data 60 is output as is for the correction data 50 Is done.
[0089]
On the other hand, if the average value is corrected three times, the contamination degree on the 80th day is 55% as shown in the average data 70 for the third time. Result. Then, there is a delay of entering the cleaning area on the 90th day after 10 days. The present invention prevents this and can immediately determine that the cleaning has been performed without correction.
[0090]
Further, when an abnormality occurs in the fire detector during the test on the 175th day after the 150th day and the original data 60 becomes 100% dimming rate, the original data 60 is in the abnormal region in this case. It becomes correction data 50 according to the invention itself, and it can be immediately understood that it is in an abnormal region.
[0091]
On the other hand, if it is corrected to the average value three times when the degree of contamination of the abnormal area is reached, 64% on the 175th day when the abnormality occurs when the light attenuation rate becomes 100%, and the next 180 It becomes 84% on the day and the abnormal value of the pollution degree 100% only on the 185th day for the third time, resulting in a delay of 3 times.
[0092]
On the other hand, in the present invention, when entering the abnormal region, the average data is not averaged three times and the original data is used as correction data, so that the degree of contamination that has become the abnormal region is immediately output and the necessary determination processing is performed. be able to.
[0093]
In the above embodiment, the case where the light extinction rate and transmittance calculated by the fire detector are transmitted to the disaster prevention receiving board as fouling analog value data is taken as an example. The received light detection signal may be output as an analog value to the disaster prevention receiving board as it is, and the light reduction rate and transmittance may be calculated on the disaster prevention receiving board side.
[0094]
In the above embodiment, only a tunnel is described as a space for installing a fire detector and monitoring a fire. However, other adverse environment spaces such as plants and factories such as garbage pits, mining mining of metals, coal, oil, etc. It can also be applied to fire monitoring.
[0095]
In the above embodiment, the analog value signal indicating the degree of contamination of the translucent window detected during the test process is transmitted to the disaster prevention receiver, but the analog value signal obtained during the test process is used. May be stored in the fire detector, and in addition to the test process, a dedicated command may be transmitted from the disaster prevention reception panel to return the analog value signal stored in the storage unit of the fire detector.
[0096]
Furthermore, 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.
[0097]
【The invention's effect】
As described above, according to the present invention, the received dirty analog value signal is corrected to the average value outside the cleaning area and the abnormal area, and is corrected to the average value within the cleaning area and the abnormal area. By leaving the contamination analog value signal as it is, after the cleaning or when the detector is abnormal, the contamination analog value signal actually obtained without delay is output to perform monitoring judgment, display, storage, printing, etc. It is possible to solve the problem that the fouling analog value signal does not immediately improve after cleaning, and the abnormal fouling degree cannot be displayed immediately when a detector abnormality occurs.
[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.
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.
6 is a flowchart of processing operations of the fire detector of FIG.
FIG. 7 is a flowchart showing details of the test process of FIG.
FIG. 8 is a flowchart of the processing operation of the disaster prevention reception board of FIG.
FIG. 9 is an explanatory diagram of the degree of contamination analog data launched by the printer of the disaster prevention reception board of FIG.
10 is a graph showing the change of the degree of contamination (dimming rate) obtained by the contamination analog value correction processing of FIG. 9 with respect to the elapsed days.
[Explanation of symbols]
1: Disaster prevention reception board
2: Transmission path
3: Fire detector
3a: Cover
3b: Body
4: Fire source
5: Tunnel
5a: Tunnel wall
6: Main control unit
7: Transmission control unit
8: Relay amplifier board
9: Operation display controller
10: Display section
11: Operation unit
12: Acoustic part
14: Printer
15: Communication control unit
16: CRT
18a, 18b: Translucent window
19: Test light source storage
20: Waterproof connector
21: Signal cable
22: Mounting screw
23: Mold cover
24: Lightning protection board
25: Signal line
26: Main circuit board
28a, 28b: sensor unit
29: First detection sensor
30: Second detection sensor
31a, 31b: Test light source windows
32: Signal processor
33a: Right side detection unit
33b: Left side detection unit
34a, 34b: amplification units
35a, 35b: A / D converter
36a, 36b: Test light source
37a, 37b: Test light source control unit
38: Transmission control unit
39: Address setting section
40: Storage unit
41: Fire judgment part
42: Test processing section
100: Pollution monitoring unit
102: Correction processing unit
104: Storage unit

Claims (2)

In the disaster prevention reception board where multiple optical fire detectors are connected to the transmission line drawn out to the outside,
A contamination monitoring unit that receives and monitors a contamination analog value signal indicating the degree of contamination of the translucent window transmitted in accordance with the test operation of the optical fire detector according to a test command;
In the range of the contamination analog value signal , a cleaning region in which the degree of contamination indicating the cleaning state of the translucent window is set to a predetermined value or less is set, and the received contamination analog value signal is averaged outside the region of the cleaning region. A correction processing unit that corrects the value to be output to the contamination monitoring unit and outputs the average value of the contamination analog signal to the contamination monitoring unit without correcting the average value in the cleaning region. Disaster prevention reception board characterized by. In the disaster prevention reception panel where multiple optical fire detectors are connected to the transmission line drawn outside,
A contamination monitoring unit that receives and monitors a contamination analog value signal indicating the degree of contamination of the translucent window transmitted in accordance with the test operation of the optical detector by a test command;
In the range of the contaminated analog value signal, an abnormal region indicating the state of contamination of the translucent window where the fire monitoring function is impossible is set, and the received stained analog value signal is an average value outside the region of the abnormal region A correction processing unit that corrects and outputs the contamination analog value signal to the average value without correcting the contamination analog value signal within the abnormal region,
Disaster prevention receiving board characterized by comprising.

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