JP2023089258A - Fire detector and tunnel disaster prevention system - Google Patents

Abstract

To provide a fire detector and a tunnel disaster prevention system capable of distinguishing and determining influences of failures for fire determination according to an abnormality in a reception light signal level obtained by a test conducted periodically and capable of finely and appropriately coping to prevent non-fire notification.SOLUTION: A fire detector 12 includes a failure diagnosis unit that distinguishes between a false report side failure and a loss report side failure according to a predetermined test result. The failure diagnosis unit 86 distinguishes a case when a flame reception light signal satisfies a first upper limit side determination condition, a case when a non-flame reception light signal satisfies a first lower limit side determination condition, or a case when a relative ratio between the frame reception light signal and the non-frame reception light signal satisfies a first relative ratio determination condition or their combinations as the false report side failure, and distinguishes a case when the flame reception light signal satisfies a second lower limit determination condition, a case when the non-flame reception light signal satisfies a predetermined second upper limit determination condition, or a case when the relative ratio between the flame reception light signal and the non-fame reception light signal satisfies a predetermined second relative ratio determination condition or their combinations as the loss report side failure.SELECTED DRAWING: Figure 4

Description

The present invention relates to a fire detector and a tunnel disaster prevention system for monitoring fires in tunnels.

Conventionally, in order to protect people and vehicles from fire accidents that occur in tunnels, fire detectors are installed in tunnels such as automobile roads to monitor fires, and are connected to signal lines drawn from disaster prevention receivers. ing.

The fire detectors have detection areas in both the left and right directions, and along the longitudinal direction of the tunnel, the detection areas of the fire detectors placed adjacent to each other complementarily overlap, for example, at intervals of 25 m or 50 m. continuously spaced apart.

Fire detectors detect the presence or absence of flames by detecting the radiation energy generated by flaming combustion. 2-wavelength type, 3-wavelength type, etc. that detect the presence or absence of flame by detecting the radiation intensity in multiple wavelength bands including the infrared wavelength band generated along with the resonance radiation, and detecting the presence or absence of flame based on the relative ratio of the detected values in these multiple wavelength bands. of fire detectors are known.

For example, in a two-wavelength type fire detector, an optical wavelength bandpass filter selectively transmits radiation energy in a flame wavelength band around 4.5 μm and a non-flame wavelength band around 5.0 μm, for example. Radiation energy is received by a 4.5 μm band flame detection sensor and a 5.0 μm band non-flame detection sensor, photoelectrically converted, and subjected to predetermined processing such as amplification to generate an electrical signal corresponding to the amount of energy (hereinafter referred to as , referred to as a "light receiving signal"), and the relative ratio of the flame light receiving signal level (flame light receiving value) in the 4.5 µm band and the non-flame light receiving signal level (non-flame light receiving value) in the 5.0 µm band wavelength band is determined. The presence or absence of flame is determined by comparing with the threshold value of .

Fire detectors also monitor radiation energy, such as infrared energy, from fire flames generated in tunnels through translucent windows. We are conducting a contamination test to monitor and a sensitivity test to check the sensitivity of the light-receiving sensor.

In the contamination test of the translucent window, when a test signal periodically transmitted from the disaster prevention receiving panel is received, the test light from the test light source provided in the fire detector is incident on the translucent window, and the light-receiving sensor to obtain the light attenuation rate. For example, when the light attenuation rate exceeds a predetermined dirt threshold value, a dirt abnormality signal is transmitted to the disaster prevention receiving panel to output a dirt alarm. There is also known a system that acquires light reduction rate data from a fire detector, compares it with a threshold value on the disaster prevention receiver side, judges dirtiness, and outputs a dirt alarm.

In the sensitivity test of the light receiving sensor, when a test signal periodically transmitted from the disaster prevention receiver board is received, a test light simulating a flame is emitted from a separate built-in test light source without passing through the translucent window. The light is incident on the light-receiving sensor and the light-receiving sensitivity is detected. Until the light-receiving sensitivity decreases to a predetermined threshold sensitivity, the light-receiving value is corrected with a correction value that is the reciprocal of the detection sensitivity, and the detection sensitivity decreases to the predetermined sensitivity threshold. When the correction limit is reached, a failure signal of the light-receiving element is transmitted to the disaster prevention receiving panel to output a sensor failure alarm.

In the sensitivity test of the light-receiving sensor and the contamination test of the light-transmitting window, if the light-receiving signal level (light-receiving value) is between the predetermined upper threshold and the lower threshold, it is normal. Further, regarding the relative ratio of the flame received light signal level and the non-flame received light signal level used for fire judgment, if it is between a predetermined upper limit threshold and a lower limit threshold, it is normal, otherwise it is a failure sign candidate. When a storage condition (for example, a predetermined number of occurrences of failure predictor candidates, etc.) is satisfied, it is judged as a failure predictor indicating that there is a high possibility of failure, and a failure predictor signal is transmitted to the disaster prevention receiving panel.

JP-A-2002-246962 JP 2016-128796 A JP 2018-169893 A JP-A-2003-067861 Japanese Patent Application Laid-Open No. 2002-197580 Japanese Patent Application Laid-Open No. 2002-042262 JP-A-07-262464

By the way, in the case of a conventional fire detector, for example, when the operation period is long, it is assumed that it is operating normally without sensor failure due to the sensitivity test or contamination abnormality due to the contamination test. There is a possibility that the fire detector will suddenly output a fire signal and a non-fire alarm will be issued from the disaster prevention receiver panel. Vehicles are prohibited from passing through the tunnel by issuing warnings using warning display boards, etc., and the person in charge must go to the site to check the situation. Reliability may not be ensured.

In addition, in the failure judgment associated with the conventional test, when the signal level of the flame received signal and the non-flame received signal or the relative ratio of the two is out of the range between the upper limit threshold and the lower limit threshold, the failure sign candidate However, it is assumed that the fire judgment will be affected differently when the flame reception signal level or non-flame reception signal level exceeds the upper threshold due to a failure or the like and when it falls below the lower threshold. .

For example, if the flame reception signal level is within the normal range, but the non-flame reception signal level falls below the lower limit threshold due to a malfunction, it may be mistakenly determined as a fire. Although the received light signal level is within the normal range, if the flame received signal level falls below the lower limit threshold due to a decrease in sensitivity due to a failure or the like, there is a possibility that even if there is a fire, it will not be determined as a fire.

However, in the conventional failure judgment, when it is out of the range between the upper threshold and the lower threshold, it is uniformly judged as a failure sign candidate, and the influence on fire judgment is not taken into consideration. No detailed measures were taken.

The present invention is a fire detector and a tunnel that can discriminate and judge the influence of a failure on fire judgment from an abnormality in the received light signal level obtained in a test that is performed periodically, and make detailed and appropriate countermeasures such as prevention of non-fire alarms. The purpose is to provide a disaster prevention system.

(fire detector)
The present invention relates to a fire detector for monitoring fires in tunnels,
It is characterized by providing a fault diagnosis section for distinguishing and judging between a fault on the false alarm side and a fault on the false alarm side according to a predetermined test result.

Here, the erroneous-side failure is an abnormality that is likely to be misidentified as a fire even though it is not a fire (flame). It is an abnormality that makes it difficult to detect

(False alarm side failure and false alarm side failure)
The fire detector has a failure diagnosis unit that distinguishes between a false alarm side failure and a non-report side failure according to a predetermined test result,
Based on the flame light receiving signal and the non-flame light receiving signal obtained during the test, the failure diagnosis unit
When the level of the flame receiving signal satisfies the predetermined first upper limit side judgment condition,
when the level of the non-flame received light signal satisfies a predetermined first lower limit judgment condition, or
When the relative ratio between the level of the flame-received signal and the level of the non-flame-received signal satisfies a predetermined first relative ratio judgment condition,
Alternatively, identifying a combination of these as false alarm side failures,
When the level of the flame receiving signal satisfies the predetermined second lower limit side judgment condition,
when the level of the non-flame received light signal satisfies a predetermined second upper limit side judgment condition, or
When the relative ratio between the level of the flame-receiving signal and the level of the non-flame-receiving signal satisfies a predetermined second relative ratio judgment condition,
Alternatively, these combinations are identified as failures on the failure side.

(Transmission of a failure sign signal due to failure on the false alarm side)
The failure diagnosis unit transmits a failure sign signal to the disaster prevention receiving panel when identifying and judging the failure on the false alarm side.

(Change of fire judgment condition according to failure identification judgment)
The fire determination unit changes the fire determination conditions according to the identification result of the false alarm side failure and the non-report side failure identified by the failure diagnosis unit.

(Stricter accumulation conditions due to faults on the false alarm side)
The fire judgment unit changes the predetermined accumulation condition for judging a fire to a strict predetermined accumulation condition when identifying and judging the failure on the false alarm side.

(Relaxation of accumulation conditions due to faults on the false alarm side)
The fire judgment unit changes the predetermined accumulation condition for judging a fire to a predetermined accumulation condition that is relaxed when it identifies and judges the failure on the side of failure to report.

(Transmission of failure identification results)
The fault diagnosis unit transmits the identification result of the fault on the false alarm side and the fault on the false alarm side identified according to the test result to the disaster prevention receiving panel.

(Tunnel disaster prevention system: Sensitivity change of adjacent fire detector due to failure on the unreported side)
The present invention relates to a tunnel disaster prevention system that monitors fires by connecting a fire detector equipped with a failure diagnosis section that distinguishes and judges between false alarm side failures and non-report side failures, to a disaster prevention receiving panel.
The fire detector monitors the detection area mutually overlapping with other adjacent fire detectors,
The disaster prevention receiving panel is characterized in that it is changed so as to increase the detection sensitivity of other fire detectors arranged adjacently according to the identification result of the failure on the side of failure by the fire detector.

(Deterioration judgment of fire detector)
The disaster prevention receiving panel judges the deterioration of the fire detector based on the occurrence frequency, duration, and number of occurrences of false alarm side failures and non-alarm side failures identified by the fire detectors, and notifies them.

(Determination of signs of failure)
The disaster prevention receiving panel judges and reports a sign of failure of the fire detector based on the identification result of the failure on the false alarm side or the failure on the unreported side identified by the fire detector.

(Determination of signs of failure and fire treatment)
When the disaster prevention receiver board judges a sign of failure of the fire detector, it judges the fire signal transmitted from the fire detector as non-fire alarm and does not perform the predetermined fire processing.

(Transfer of failure sign)
When the disaster prevention receiving board judges a failure sign of the fire detector, it transmits a failure sign transfer signal to the remote monitoring and control equipment to notify it.

(basic effect)
According to the present invention, a fire detector for monitoring a fire in a tunnel is provided with a failure diagnosis unit that distinguishes between a false alarm side failure and a non-report side failure according to a predetermined test result. If there is, it is possible to determine that a failure is a non-fire alarm due to being misjudged as a fire even though it is not a fire (flame). On the other hand, if it is a failure on the false alarm side, it can be seen that the failure is difficult to be judged as a fire even though it is a fire (flame), so it is possible to take measures to suppress the false alarm. By identifying and judging the failure tendency of the failure alarm side, appropriate failure judgment and countermeasures can be taken based on the test results.

(Effect of false alarm failure and false alarm failure)
In addition, the fire detector is provided with a failure diagnostic section that distinguishes between false alarm side failures and non-alarm side failures according to a predetermined test result. Based on the signal, when the level of the received flame signal satisfies a predetermined first upper limit side judgment condition, when the level of the non-flame received signal satisfies a predetermined first lower limit side judgment condition, or when the level of the flame received signal and the level of the non-flame received signal satisfies a predetermined first relative ratio determination condition, or a combination thereof is identified as a false alarm side failure, and the level of the flame received signal is a predetermined second lower limit. When the level of the non-flame light receiving signal satisfies the predetermined second upper limit side judgment condition, or when the ratio of the level of the flame light receiving signal to the level of the non-flame light receiving signal When the relative ratio determination condition is satisfied or a combination thereof is identified as the failure on the false alarm side, the failure on the false alarm side and the failure on the failure alarm side can be appropriately identified and determined from the test results.

(Effect of transmission of failure sign signal due to failure on false alarm side)
In addition, when the failure diagnosis unit identifies and judges a failure on the false alarm side, it sends a failure sign signal to the disaster prevention receiver. Since it is a failure with a high degree of urgency that a non-fire alarm is issued, when a failure on the false alarm side is identified, a failure sign signal is promptly sent to the disaster prevention receiver panel to prevent non-fire alarms.

(Effect of changing fire judgment condition according to failure identification judgment)
In addition, the fire determination unit changes the fire determination conditions according to the identification results of false alarm side failures and false alarm side failures identified by the failure diagnosis unit. By changing the sensitivity, etc., it is possible to suppress false alarms and missing alarms caused by the failure of the light receiving sensor, and to enable fine-tuned countermeasures.

(Effect of stricter accumulation conditions due to faults on the false alarm side)
In addition, when the fire judgment unit identifies and judges a failure on the false alarm side, the predetermined accumulation condition for judging a fire is changed to a strict prescribed accumulation condition. To make it difficult to transmit a fire signal due to an erroneous fire judgment by strictly changing accumulation conditions, and to prevent non-fire alarms.

(Effect of alleviating accumulation conditions due to faults on the false alarm side)
In addition, when the fire judgment unit identifies and judges the failure on the side of failure, the predetermined accumulation condition for judging a fire is changed to a relaxed prescribed accumulation condition, for example, the number of accumulated fire judgments is reduced. to make it easier to detect a fire by relaxing the accumulation condition, and to prevent misreporting.

(Effect of sending fault identification results)
In addition, the failure diagnosis unit sends the identification result of false alarm side failure and non-alarm side failure identified according to the test results to the disaster prevention receiver panel. Receives and stores failures and unreported side failures as failure information, reads out the failure information as needed for reference or analysis, and can be taken outside for use. It is possible to appropriately perform operation management such as inspection and replacement/repair based on information.

(Tunnel disaster prevention system: Effect of changing the sensitivity of the adjacent fire detector due to failure on the unreported side)
The present invention relates to a tunnel disaster prevention system that monitors fires by connecting a fire detector equipped with a failure diagnosis section that distinguishes and judges between false alarm side failures and non-report side failures to the disaster prevention receiving panel. , redundantly monitors the detection area between adjacent fire detectors in a mutually complementary manner. Since it was changed to increase the detection sensitivity of the other fire detectors, it compensates for the fire monitoring of the fire detector that identified and judged the failure on the unreported side, and reliably detects and responds to fires. be able to.

(Effect of Deterioration Judgment of Fire Detector)
In addition, the disaster prevention receiver panel judges and reports the deterioration of the fire detector based on the occurrence frequency, duration, and number of occurrences of false alarm side failures and non-alarm side failures identified by the fire detector. If the occurrence frequency, duration, number of occurrences, etc. of the failure on the false alarm side are high, it can be judged that the deterioration is progressing, and prompt strengthening of inspection and formulation of a replacement plan can be carried out. If the frequency, duration, number of occurrences, etc. are high, the deterioration is progressing, but if the adjacent fire detector is sound, it is judged that the urgency is relatively low, and there is plenty of time to strengthen inspections and formulate a replacement plan. etc.

(Effect of Failure Prediction Judgment)
In addition, the disaster prevention receiving panel judges and reports a sign of failure of the fire detector, that is, a decrease in reliability, based on the identification result of the failure on the false alarm side or the failure on the unreported side identified by the fire detector. Since failures on the false alarm side are of high urgency, it is possible to strengthen inspections and formulate replacement plans by judging and reporting failure signs without storing them. If so, since the degree of urgency is relatively low, when a predetermined accumulation condition is satisfied, it is judged to be a sign of failure and notified, thereby making it possible to plan necessary inspections and replacement plans.

(Effects of fault prediction judgment and fire treatment)
In addition, when the disaster prevention receiver board judges a failure sign of a fire detector, it judges the fire signal sent from the fire detector as a non-fire alarm and does not perform the prescribed fire processing. will send a fire signal due to an erroneous fire judgment, and even if the disaster prevention receiver receives the fire signal, it will not perform fire processing, such as a vehicle entry prohibition alarm, to solve the problem caused by non-fire alarms. .

(Effect of failure sign transfer)
In addition, when the disaster prevention receiver board detects a failure sign of a fire detector, it sends a failure sign transfer signal to the remote monitoring and control equipment to notify it. The person in charge of the control equipment can know that the reliability of the fire detector is declining. Appropriately grasp the fire monitoring status and use it for tunnel operation management

Explanatory diagram showing the outline of the tunnel disaster prevention system Explanatory diagram showing the detection area of the fire detector Explanatory diagram showing the exterior of the fire detector Block diagram showing the outline of the functional configuration of the fire detector Flowchart showing the control operation of the fire detector A flow chart showing the details of the fire judgment process in step S1 of FIG. A flow chart showing the details of the fault diagnosis process in step S5 of FIG. Block diagram showing the outline of the functional configuration of the disaster prevention receiver

[Basic concept of the embodiment]
FIG. 1 is an explanatory diagram showing the outline of the tunnel disaster prevention system, and FIG. 2 is an explanatory diagram showing the detection area of the fire detector. The basic concept of this embodiment is a fire detector 12 that monitors fires by connecting to signal lines 14a and 14b drawn out from the disaster prevention receiving panel 10 into the upstream tunnel 1a and the downstream tunnel 1b, A fault diagnosis unit is provided for discriminating and judging whether a fault on the false alarm side or a fault on the false alarm side is determined according to the result of a predetermined test such as a sensitivity test.

The false alarm side failure identified by the failure diagnosis unit is an abnormality that is likely to be misidentified as a fire even though it is not a fire (flame). This is an anomaly that is difficult to detect even though it exists.

For this reason, when the flame light reception signal and the non-flame light reception signal obtained by the test exceed or exceed a predetermined upper limit value, the failure diagnosis section detects that the non-flame light reception signal is equal to or less than the predetermined lower limit value or falls below the predetermined lower limit value. When the ratio of the flame reception signal and the non-flame reception signal exceeds a predetermined upper limit value or above a predetermined upper limit value, or a combination of these, it is identified as a fault on the false alarm side, and the fault diagnosis section performs a test. When the flame light receiving signal and the non-flame light receiving signal obtained by the above are equal to or less than the predetermined lower limit value or less than the lower limit value, when the non-flame light receiving signal exceeds or exceed the predetermined upper limit value, the flame When the ratio of the received light signal and the non-flame received signal is equal to or less than a predetermined lower limit value, or falls below the lower limit value, or a combination thereof, it is discriminated as failure on the failure alarm side.

By performing this kind of failure diagnosis, it is possible to know that a failure on the false alarm side is likely to be misjudged as a fire even though it is not a fire (flame), and is likely to result in a non-fire alarm. On the other hand, if it is a failure on the non-alert side, it can be understood that it is a failure that is difficult to judge as a fire even though it is a fire (flame), so it is possible to suppress the failure. It is possible to take appropriate measures based on the test results by distinguishing and judging whether the failure tendency is on the false alarm side or on the unreported side.
A detailed description will be given below.

[Overview of Tunnel Disaster Prevention System]
As shown in FIG. 1, an up-line tunnel 1a and a down-line tunnel 1b are constructed as tunnels of a motorway. Inside the up line tunnel 1a and the down line tunnel 1b, fire detectors 12 are installed at intervals of, for example, 25 meters or 50 meters along the walls in the longitudinal direction of the tunnels.

The fire detector 12 is provided with two sets of fire detection units, so that, as shown in FIG. The detection area 15 with the fire detector 12 arranged in each is arranged continuously so that the right eye 13R and the left eye 13L overlap each other in a mutually complementary manner, and the infrared rays from the flame caused by the fire occurring in the detection area 15 are detected. Fires are detected by observation.

In addition, in the inbound line tunnel 1a and the outbound line tunnel 1b, as emergency facilities, a manual reporting device and an emergency telephone are provided for fire reporting, and a fire hydrant device is provided for extinguishing the fire and preventing the spread of the fire. In order to protect the inside of the tunnel frame and ducts from fire, a water spraying system for spraying fire extinguishing water from a water spraying head is installed, but illustration is omitted.

Signal lines 14a and 14b, including power lines, are led out from the disaster prevention receiving panel 10 to the upstream tunnel 1a and downstream tunnel 1b, and a fire detector 12 is connected, and a unique address is set to the fire detector 12. It is

In addition, for the disaster prevention receiving panel 10, fire pump equipment 16, duct cooling pump equipment 18, IG slave station equipment 20, ventilation equipment 22, alarm display board equipment 24, radio rebroadcast equipment 26, television monitoring equipment 28 The fire detector 12 and the disaster prevention receiving panel 10 communicate with each other through signal lines 14a and 14b by so-called R-type transmission.

Here, the IG slave station equipment 20 is communication equipment that connects the disaster prevention receiving panel 10 and the remote monitoring control equipment 32, which is an externally provided upper equipment, via a network.

The ventilation equipment 22 is equipment that causes a ventilation flow in the longitudinal direction of the tunnel by operating a jet fan installed on the ceiling side of the tunnel at a high blowing air velocity.

The warning display board facility 24 is a facility for notifying users in the tunnel of an abnormality in the tunnel, such as an entry prohibition warning due to a fire, by displaying it on an electric display board. The radio rebroadcast facility 26 is a facility for enabling drivers and others in tunnels to receive information from road administrators. The television monitoring equipment 28 is equipment for checking the scale and position of the fire, operating the water spray equipment, and grasping the situation inside the tunnel when conducting evacuation guidance. The lighting equipment 30 is equipment for driving and managing the lighting equipment in the tunnel.

[Fire detector]
(Appearance of fire detector)
FIG. 3 is an explanatory diagram showing the appearance of the fire detector, and FIG. 4 is a block diagram showing an outline of the functional configuration of the fire detector.

As shown in FIG. 3, the fire detector 12 is provided with two pairs of translucent windows 50R and 50L divided into left and right in a sensor housing portion 48 provided in the upper portion (detector cover) of a housing 46. , and light-transmissive windows 50R and 50L, respectively, housed and arranged fire detectors having light-receiving sensors. In addition, two sets of test light source translucent windows 52R each containing an external test light source used for stain test of the translucent windows 50R and 50L at a position near the translucent windows 50R and 50L, where the light receiving sensors can be seen. , 52L are provided.

In the following description, the translucent window 50R may be called the right-eye translucent window 50R, and the translucent window 50L may be called the left-eye translucent window 50L.

(Schematic configuration of fire detector)
As shown in FIG. 4, the fire detector 12 includes a detector control section 54, a transmission section 56, a power supply section 58, two pairs of left and right fire detection sections 60R and 60L, a test light emission drive section 72, and a sensitivity test. There are provided internal test light sources 74R, 75R, internal test light sources 74L, 75L, and external test light sources 76R, 76L used for soil testing. In the following description, the fire detection section 60R may be referred to as the right eye fire detection section 60R, and the fire detection section 60L may be referred to as the left eye fire detection section 60L.

The detector control unit 54 is a function realized by executing a program, for example, and a computer circuit or the like having a CPU, a memory, various input/output ports, etc. is used as hardware.

The transmission unit 56 is connected to the transmission unit 36 of the disaster prevention receiving panel 10 shown in FIG. 1 by the transmission line S of the signal line 14 and the transmission common line SC, and various signals are transmitted and received by R-type transmission.

The power supply unit 58 receives power from the disaster prevention receiving panel 10 shown in FIG. A predetermined power supply voltage is supplied to the detection units 60R and 60L and the test light emission driving unit 72. FIG.

Internal test light sources 74R, 75R, 74L, and 75L used for sensitivity tests are connected to the test light emission driving section 72, and external test light sources 76R and 76L used for contamination tests are connected. is provided.

(Fire detector)
The fire detection units 60R, 60L include a flame detection sensor 64, a non-flame detection sensor 68, and amplification processing units 66,70. Taking the right-eye fire detection unit 60R as an example, a right-eye translucent window 50R provided in the detector cover is arranged in front of the flame detection sensor 64 and the non-flame detection sensor 68. Infrared energy from an external detection area is incident on the flame detection sensor 64 and the non-flame detection sensor 68 through the thermal window 50R.

The right eye fire detection unit 60R monitors fire by, for example, two-wavelength flame detection. The flame detection sensor 64 detects the wavelength band of 4.4 to 4.5 μm, which is the resonance radiation band of CO2 peculiar to flame, from the infrared energy incident through the right-eye translucent window 50R as an optical wavelength bandpass. It is selectively transmitted by a filter, the energy of the infrared ray is detected by a light receiving sensor element, and photoelectrically converted. Output to the detector control unit 54 . Here, the flame detection sensor 64 and the amplification processor 66 constitute a flame receiver.

The non-flame detection sensor 68 selectively transmits a wavelength band of 5 to 6 μm from the infrared energy incident through the left-eye translucent window 50L by an optical wavelength band-pass filter, and detects the infrared rays by a light receiving sensor element. After the energy is detected and photoelectrically converted, the signal is subjected to predetermined processing such as amplification by the amplification processing unit 70 and output to the detector control unit 54 as a non-flame received signal E2R corresponding to the amount of energy. Here, the non-flame detection sensor 68 and the amplification processing section 70 constitute a non-flame light receiving section.

The amplification processing units 66 and 70 are provided with a preamplifier, a filter for selectively passing the flame fluctuation frequency band, a power amplifier, and the like.

(fire judgment)
The detector control section 54 is provided with the function of the fire determination section 80 as a function realized by executing the program. The fire judgment unit 80 calculates, for example, the relative ratio E1R/E2R of the light reception values (light reception signal levels) of the flame light reception signal E1R and the non-flame light reception signal E2R output from the amplification processing units 66 and 70 of the right eye fire detection unit 60R. Then, the presence or absence of flame is determined by comparing it with a predetermined threshold value, and when the fire is detected by determining the presence of flame, the transmission unit 56 is instructed to respond to the call signal matching the self-address as a response signal to the fire. Control is performed to transmit a fire signal in which detection information is set to the disaster prevention receiving panel 10 . In the following description, the signal level of the flame light receiving signal E1R may be referred to as the flame light receiving value E1R, and the signal level of the non-flame light receiving signal E2R may be referred to as the non-flame light receiving value E2R. Each level may be, for example, an integral value of the received light signal every predetermined time (for example, two seconds). The left eye fire detection section 60L performs similarly.

Infrared radiation from fire flames is strongly radiated in the 4.4 to 4.5 μm band, and relatively weak in the 5 to 6 μm band. It is known to be the opposite, and the configuration described above is used to identify and detect fires.

(Sensitivity test)
The detector control section 54 is provided with a sensitivity test section 82 as a function realized by executing a program. The sensitivity test section 82 functions as a test section. The sensitivity test section 82 operates when it receives a test signal designating its own address from the disaster prevention receiver board 10 via the transmission section 56, and instructs the test light emission driving section 72 to 74L and 75L are driven to emit light in order to perform the sensitivity test of the fire detection units 60R and 60L. The internal test light sources 74R, 75R and the internal test light sources 74L, 75L may be shared by one light source.

For example, taking the sensitivity test of the flame detection unit composed of the flame detection sensor 64 and the amplification processing unit 66 in the right eye fire detection unit 60R, the test light emission drive unit 72 drives the internal test light sources 74R and 75R to emit light. , the flame imitation light simulating the fire flame is made incident on the flame detection sensor 64 and the non-flame detection sensor 68 . The flame-simulated light from the internal test light sources 74R, 75R includes radiant energy of 4.4-4.5 μm specific to flame received by the flame detection sensor 64 and 5-6 μm radiant energy received by the non-flame detection sensor 68, and , the light having a fluctuation frequency of, for example, 1 to 8 Hz, which is unique to the flame.

The sensitivity test section 82 performs a sensitivity test for each of the flame light receiving section composed of the flame detection sensor 64 and the amplification processing section 66 and the non-flame light receiving section composed of the non-flame detection sensor 68 and the amplification processing section 70 .

For example, in the sensitivity test of the flame light receiving unit composed of the flame detection sensor 64 and the amplification processing unit 66, the reference light receiving value E1Rref, which is initially set at the time of shipment from the factory, is stored in the memory. The detected flame received light value E1R substantially matches the reference received light value E1Rref, and the detection sensitivity obtained by dividing the flame received light value E1R by the reference received light value E1Rref is approximately 1. If, for example, the performance of the flame detection sensor 64 deteriorates and the sensitivity decreases with the passage of the operating period, the flame light reception value E1R gradually decreases, and the detection sensitivity is 0.9, 0.8, 0.7, for example. It becomes a value such as

When the detection sensitivity decreases to 1 or less in this way, the sensitivity test unit 82 obtains the detection sensitivity by the sensitivity test, obtains a correction value that is the reciprocal of the detection sensitivity, stores it in the memory, and detects it in the subsequent operation state. The flame light reception value E1R is multiplied by the correction value to perform sensitivity correction, and the fire judgment unit 80 judges a fire based on the sensitivity-corrected light reception value.

Further, a sensitivity threshold corresponding to the sensitivity correction limit, for example, a sensitivity threshold of 0.5 is preset in the sensitivity test unit 82, and when the detection sensitivity obtained by the sensitivity test is equal to or less than the sensitivity threshold Then, it determines that the sensor unit 64 has malfunctioned due to sensitivity abnormality, and instructs the transmission unit 56 to set the sensor failure information in the response signal to the call signal that matches the own address and transmit it to the disaster prevention receiver panel 10 . In order to make sure that the sensor is faulty, the sensitivity test section 82 sends a response signal indicating that the sensor is faulty when the accumulation condition is satisfied for a plurality of consecutive times to determine that the sensor is faulty due to abnormal sensitivity. can be If the detection sensitivity increases due to an abnormal output or the like due to a failure, it is corrected in the same way, and if it reaches its limit, it is determined to be abnormal.

The sensitivity test of the non-flame light receiving section composed of the non-flame detection sensor 68 and the amplification processing section 70 in the right eye fire detection section 60R is performed in the same manner by the test light emission driving section 72 driving the internal test light source 75R to emit light. A sensitivity test is performed.

In addition, the sensitivity test of the flame light receiving section composed of the flame detection sensor 64 and the amplification processing section 66 and the non-flame light receiving section composed of the non-flame detection sensor 68 and the amplification processing section 70 in the left eye fire detection section 60L. A sensitivity test is similarly performed by driving the internal test light sources 74L and 75L to emit light by the test light emission driving section 72. FIG.

Furthermore, the sensitivity test section 82 receives the test signal from the disaster prevention receiver panel 10 and performs the sensitivity test of the right eye fire detection section 60R and the left eye fire detection section 60L. The flame light reception values E2R and E2L are stored and used by the fault diagnosis unit 86 to determine fault identification. Such sensitivity abnormality may be caused not only by a failure of the detection sensor but also by a circuit failure of the amplifier circuit section 66, for example.

(dirt test)
The detector control section 54 is provided with a contamination test section 84 as a function realized by executing a program. The contamination test section 84 also functions as a test section. The contamination test section 84 operates when it receives a test signal specifying its own address from the disaster prevention receiver 10 via the transmission section 56, and instructs the test light emission driving section 72 to turn on the external test light sources 76R and 76L. The contamination test of the translucent windows 50R and 50L is performed by sequentially emitting light.

For example, taking a contamination test on the translucent window 50R, the test light emission drive unit 72 drives the external test light source 76R to emit a flame imitation light corresponding to a fire flame through the translucent window 50R. The light is made incident on the flame detection sensor 64 . The flame-like light from the external test light source 76R includes radiant energy of 4.4-4.5 μm specific to the flame received by the flame detection sensor 64 and 5-6 μm of radiant energy received by the non-flame detection sensor 68, and light having a fluctuation frequency of, for example, 1 to 8 Hz, which is peculiar to .

The translucent window 50R is clean at the time of shipment from the factory and has the maximum light transmission performance. In this state, the flame light reception values E1R and E2R obtained in the dirt test are stored in the memory as the reference light reception values E1Rref and E2Rref, and are used to calculate the light attenuation rate.

The flame received light value E1R and the non-flame received light value E2R obtained in the contamination test at the time of system start-up approximately match the reference received light values E1Rref and E2Rref. The light attenuation rate obtained by dividing is approximately 0. As the operating period elapses, dirt adheres to the translucent window 50R, and the light attenuation rate gradually increases, for example, 0.1, 0.2, 0.3, and so on.

When the light attenuation rate increases in this way, the contamination test unit 84 obtains the light attenuation rate by the contamination test and also obtains a correction value that is the reciprocal of (1-light attenuation rate) and stores it in the memory for subsequent operation. Dirt correction is performed by dividing the light reception value detected in the state (light reception value corrected by the correction value of the sensitivity test) by the correction value, and the fire judgment unit 80 judges a fire from the dirt-corrected light reception value. The received light value detected in the operating state is corrected based on both the correction value obtained in the sensitivity test and the correction value obtained in the contamination test.

Further, a dirt threshold, for example, a dirt threshold of 0.2, which is a light attenuation rate corresponding to the dirt correction limit, is set in advance in the dirt test section 84. When the contamination threshold is exceeded, it is determined that the contamination correction of the light-transmitting window 50R has reached its limit, and the transmission unit 56 is instructed to set the contamination abnormality information in the response signal to the call signal matching the own address. and control to transmit to the disaster prevention receiving board 10. The left eye fire detection section 60L performs similarly.

Further, the contamination test unit 84 stores the flame light reception value E1 and the non-flame light reception value E2 detected by the contamination test of the translucent windows 50R and 50L, which is performed by receiving the test signal from the disaster prevention receiver panel 10. and is used for sensitivity correction by the sensitivity correction unit 82 .

For example, 0.3, which is lower than the contamination threshold, is set as the contamination warning threshold. When it is not ready, it is also possible to transmit to the disaster prevention receiving panel 10 the abnormality information of the contamination advance notice indicating that the contamination correction limit is approaching. Here, the dirt abnormality when the light attenuation rate reaches the dirt threshold value of 0.2 and the dirt warning abnormality information when the light attenuation rate reaches the dirt warning threshold value of 0.3 are each included in the failure diagnosis information. can be one.

(Failure Diagnosis Department)
The detector control section 54 is provided with a function of a fault diagnosis section 86 as a function realized by executing a program.

The failure diagnosis unit 86 detects and stores the flame light reception value E1R, which is detected and stored by, for example, the sensitivity test of the right eye fire detection unit 60R performed by the sensitivity test unit 82 after receiving the test signal from the disaster prevention receiving panel 10. The non-flame received light value E2R is read out, and it is discriminated whether the flame received light value E1R and the non-flame received light value E2R are faults on the false alarm side or on the false alarm side.

Here, the erroneous-side failure is an abnormality in which it is likely to be misidentified as a fire even though it is not a fire (flame). is an abnormality that makes it difficult to detect

The identification judgment of the failure on the false alarm side or the failure on the false alarm side by the failure diagnosis unit 86 is as follows. First, the identification judgment of the fault on the false alarm side by the fault diagnosis unit 86 is as follows.
(A1) When the received flame value E1R exceeds a predetermined upper threshold value E1Rmax or exceeds the upper threshold value E1Rmax,
(A2) When the non-flame received light value E2R is equal to or lower than a predetermined lower threshold value E2Rmin or lower than the lower threshold value E2Rmin,
(A3) When the relative ratio RR=(E1R/E2R) between the flame received light value E1R and the non-flame received light value E2R is greater than or equal to a predetermined upper limit threshold RRmax or exceeds the upper limit threshold RRmax,
(A4) a combination of (A1) to (A3);
in either case.

On the other hand, the identification judgment of the failure on the failure alarm side by the failure diagnosis unit 86 is as follows.
(B1) When the received flame value E1R is equal to or lower than a predetermined lower threshold value E1Rmin or lower than the lower threshold value E1Rmin,
(B2) When the non-flame received light value E2R exceeds a predetermined upper limit threshold E2Rmax or exceeds the upper limit threshold E2Rmax,
(B3) When the relative ratio RR=(E1R/E2R) between the flame received light value E1R and the non-flame received light value E2R is equal to or less than the predetermined lower limit threshold RRmin or below the lower limit threshold RRmin,
(B4) a combination of (B1) to (B3);
in either case. The left eye fire detection section 60L performs similarly.

Further, the failure diagnosis unit 86 performs control to transmit a failure sign signal to the disaster prevention receiving panel 10 when identifying and judging a failure on the false alarm side. A failure on the false alarm side is a failure with a high degree of urgency, in which the fire detector 12 erroneously sends a fire signal and a non-fire alarm is issued from the disaster prevention receiver 10. In addition, a failure predictor signal is transmitted to the disaster prevention receiving panel 10 to enable processing control for preventing non-fire alarms.

Further, the failure diagnosis unit 86 notifies the fire determination unit 80 of the identification determination result of the false alarm side failure or the false alarm side failure, and performs control to change the fire determination conditions. When the failure diagnosis unit 86 identifies and determines a failure on the false alarm side, the fire determination unit 80 changes the predetermined accumulation condition for determining fire to a strict predetermined accumulation condition. For example, the fire determination unit 80 increases the number of accumulated fire determinations, thereby changing the accumulation condition to be stricter. As a result, there is a high possibility that a fire signal will be sent due to an erroneous fire judgment due to a fault on the false alarm side. To prevent a non-fire alarm from a receiving panel 10.例文帳に追加

In addition, when the failure diagnosis unit 86 identifies and determines a failure on the side of failure, the fire determination unit 80 changes the accumulation condition for judging a fire to a relaxed accumulation condition. For example, the fire judgment unit 80 reduces the accumulated number of fire judgments, thereby relaxing the accumulation condition. Since it is difficult to detect a fire due to a failure on the side of the alarm, the accumulation condition is eased to make it easier to transmit a fire signal based on the fire judgment, thereby preventing the alarm from the disaster prevention receiving panel 10.例文帳に追加

In addition, the failure diagnosis section 86 performs control for transmitting to the disaster prevention receiving panel 10 the result of discrimination between the false alarm side failure and the non-report side failure identified according to the test result. The fault diagnosis unit 86 stores the identification judgment result of the identified fault on the false alarm side and the fault on the false alarm side as fault diagnosis information. When receiving a read request from 10, control is performed to read out and transmit failure diagnosis information stored as log information. At this time, the log information can also include the received light value during the contamination test by the contamination test section 84 .

For this reason, the disaster prevention receiving panel 10 receives and stores failure diagnosis information, which is the result of discriminating between false alarm side failures and non-report side failures, obtained by testing with the fire detector 12, and stores the failure diagnosis information as necessary. It is possible to read out and refer to or analyze, and furthermore, take it out and use it outside, and it is possible to appropriately perform operation management such as inspection, replacement and repair based on the failure information of the fire detector 12 on the disaster prevention receiver 10 side. and

In addition, the failure diagnosis section 86 detects and stores the flame light reception value E1 detected by the contamination test of the translucent windows 50R and 50L performed by the contamination test section 84 upon receiving the test signal from the disaster prevention receiver panel 10, and The non-flame received light value E2 can be read out, failures can be identified and determined for each of the flame received light value E1 and the non-flame received light value E2 in the same manner as in the sensitivity test, and processing control can be performed according to the identification result. Abnormalities related to contamination can be handled in the same manner as failures on the failure side. The administrator who has learned of the contamination problem can deal with it by cleaning the translucent window, and if the adjacent fire detector is sound, it is possible to provide a grace period for this cleaning.

[Control operation of fire detector]
(Outline of control operation)
FIG. 5 is a flow chart showing the control operation of the fire detector. As shown in FIG. 5, the detector control section 54 of the fire detector 12 performs fire judgment processing by the fire judgment section 80 in step S1, and determines reception of the test signal from the disaster prevention receiving panel 10 in step S2. Then, the process proceeds to step S3 to perform a sensitivity test by the sensitivity test section 82, then to step S4 to perform a contamination test by the contamination test section 84. When these tests are completed, the process proceeds to step S5, where the A fault diagnosis process is performed by the fault diagnosis unit 86 based on the received light value.

(Fire judgment processing)
FIG. 6 is a flow chart showing the details of the fire judgment processing in step S1 of FIG.

As shown in FIG. 6, the fire determination unit 80, taking the right eye fire detection unit 60R of FIG. The signal E2R is read by AD conversion, and if the flame reception signal E1 is equal to or greater than a predetermined value in step S12, the process proceeds to step S13, where the relative ratio (E1R/E2R) between the flame reception signal E1R and the non-flame reception signal E2R is calculated, and a predetermined value is obtained. If it is equal to or greater than the value, it is determined that the fire determination in the first stage is satisfied and the process proceeds to step S14.

Subsequently, in step S14, the fire determination unit 80 performs a fast Fourier transform (FFT operation) on the received flame signal E1R. If the above conditions are met, the process advances to step S16 assuming that the fire determination of the second stage is satisfied, and the fire determination of the first stage and the second stage by steps S11 to S15 as a predetermined accumulation condition has been established consecutively for a predetermined number of times of accumulation. It is determined whether or not the accumulation condition is passed.

Subsequently, when the fire determination unit 80 determines in step S16 that the number of times of accumulation as the accumulation condition is satisfied, the process proceeds to step S17 to determine a fire, transmit a fire signal to the disaster prevention receiving panel 10, and perform fire processing. let it happen Subsequently, when it is determined in step S18 that a fire restoration signal has been received from the disaster prevention receiving panel 10, the number of accumulated fires is cleared in step S19 for restoration, and the process returns to the initial step S11. The left eye fire detection unit 60L is similarly performed in parallel.

(Failure diagnosis processing)
FIG. 7 is a flow chart showing the details of the failure diagnosis processing in step S5 of FIG.

As shown in FIG. 7, taking the right eye fire detection unit 60R as an example, the failure diagnosis unit 86 detects and stores the flame received light value E1R and the non-flame received light value as the test results detected and stored by the sensitivity test in step S21. E2R is read, and in step S22, it is determined whether or not the received flame value E1R is within the normal range (range between the upper threshold value E1Rmax and the lower threshold value E1Rmin). If so, the process proceeds to step S31 to discriminate it as a fault on the false alarm side. If the received flame value E1R is not equal to or greater than the upper limit threshold value E1Rmax in step S23, the failure diagnosis unit 86 proceeds to step S24. Identify.

The failure diagnosis unit 86 then proceeds to step S25 to determine whether or not the non-flame received light value E2 is within the normal range (the range between the upper threshold value E2Rmax and the lower threshold value E2Rmin). If it is equal to or higher than the upper limit threshold E2Rmax, the process proceeds to step S32 to discriminate as a failure on the side of failure. If the non-flame received light value E2 is not equal to or greater than the upper threshold value E2Rmax in step S26, the failure diagnosis unit 86 proceeds to step S27. Identify as faulty.

Subsequently, the failure diagnosis unit 86 advances to step S28 to calculate the relative ratio RR=(E1R/E2R), and determines whether the relative ratio R is within the normal range (the range between the upper limit threshold value Rmax and the lower limit threshold value Rmin). If it is not within the normal range, the process proceeds to step S29, and if it is equal to or greater than the upper limit threshold value RRmax, the process proceeds to step S31 to discriminate the failure on the false alarm side. If the relative ratio RR is not equal to or greater than the upper limit threshold value RRmax in step S29, the fault diagnosis unit 86 proceeds to step S30, and if the relative ratio RR is equal to or less than the lower limit threshold value RRmin in step S30, the fault diagnosis unit 86 proceeds to step S32 to identify a failure on the side of failure to report. do. The left eye fire detection unit 60L performs the same operation in parallel.

Note that the fault diagnosis processing in FIG. It may also be used as a fault diagnosis. Further, the failure diagnosis section 86 performs a predetermined failure diagnosis process on the flame received light value E1R and the non-flame received light value E2R detected by the contamination test and stored in accordance with the outline described above using the light attenuation rate.

[Disaster prevention receiver]
(Schematic configuration of disaster prevention receiving panel)
FIG. 8 is a block diagram showing an outline of the functional configuration of the disaster prevention receiving panel. As shown in FIG. 8, the disaster prevention receiving board 10 includes a reception control unit 34. The reception control unit 34 is a function realized by executing a program, for example. using a computer circuit or the like with

Transmission units 36a and 36b are provided for the reception control unit 34, and a plurality of fire detectors 12 installed in the up line tunnel 1a and the down line tunnel 1b are connected to the signal lines 14a and 14b drawn from the transmission units 36a and 36b, respectively. is connected.

In addition, to the reception control unit 34, an alarm unit 38 equipped with a speaker, an alarm indicator lamp, etc., a display unit 40 equipped with a liquid crystal display, a printer, etc., an operation unit 42 equipped with various switches, etc., and an IG slave station equipment 20 are connected. A modem 44 is provided, and the fire pump equipment 16, cooling pump equipment 18, ventilation equipment 22, alarm display board equipment 24, radio rebroadcast equipment 26, television monitoring equipment 28 and lighting equipment 30 shown in FIG. 1 are connected. IO unit 45 is provided.

The reception control unit 34 instructs the transmission units 36a and 36b to repeatedly transmit a call signal including a polling command sequentially specifying the address of the fire detector 12, and the fire detector 12 receives a call signal matching its own address. , it returns a response signal containing its own status information such as fire detection and test results. In the following description, a response signal including information indicating that a fire has been detected may be referred to as a fire signal. The fire signal may be transmitted as an interrupt signal from the fire detector 12 to the disaster prevention receiving panel 10 when a fire is detected.

In addition, when the reception control unit 34 of the disaster prevention receiver 10 detects the reception of the fire signal from the fire detector 12, the alarm unit 38 outputs a fire alarm and instructs interlocking control of other equipment via the IO unit 45. control.

In addition, the reception control unit 34 transmits a test signal in which a test instruction command sequentially specifying the address of the fire detector 12 is set when the system is started up or at predetermined intervals during operation, and the fire detector 12 receives the test signal. A sensitivity test and a contamination test are performed, and control is performed to respond with the respective test results. If necessary, additional information such as failure diagnosis information and each light receiving value at each test is included in the transmission. In addition, it is also possible to send a test signal to an individual fire detector 12 to perform a test by performing a test operation in which the address of a specific fire detector 12 is designated by the operation unit 42 .

Further, when the reception control unit 34 receives a failure response signal obtained by the sensitivity test of the fire detector 12, the failure alarm specifying the address of the fire detector 12 is generated by the alarm sound of the alarm unit 38 and the display unit 40. Controls to notify by display and printing.

Further, when the reception control unit 34 receives the response signal of the contamination abnormality obtained by the sensitivity test of the fire detector 12, the contamination alarm specifying the address of the fire detector 12 is generated by the alarm sound of the alarm unit 38 and the display unit 40. display, and control to notify by printing.

In addition, when the reception control unit 34 receives a response signal indicating an abnormality such as a failure or contamination obtained by the sensitivity test and contamination test of the fire detector 12, the IG slave station equipment 20 shown in FIG. It is transmitted to the remote monitoring and control equipment 32 via the remote monitoring and control equipment 32, and performs control to issue a failure alarm or abnormality alarm.

In addition, the reception control unit 34 performs control to change the threshold value for judging whether the fire detector 12 has abnormal sensitivity or contamination based on the operation of the operation unit 42 using the display of the display unit 40, for example. conduct. This control for changing the threshold value can change the threshold value of all the fire detectors 12 all at once, or can change the threshold value of a specific fire detector 12 by designating an address. Of course, the threshold value may be changed by automatic determination and automatic control without depending on the operation of the operation unit 42 .

(Control function based on failure diagnosis result of fire detector)
The reception control unit 34 mutually complements and redundantly monitors the detection areas between the plurality of fire detectors 12 installed in the up line tunnel 1a and the down line tunnel 1b and other adjacent fire detectors 12. Therefore, the detection sensitivity of the other fire detectors 12 arranged adjacently is changed so as to be increased according to the identification result of the failure on the side of failure received as failure diagnosis information from the fire detector 12. control.

Therefore, when the failure of the fire detector 12 is identified, the failure of the fire detector 12 can be identified by increasing the detection sensitivity of the other fire detectors 12 monitoring the same detection area. By compensating for the fire monitoring of the fire detector 12, the fire can be reliably detected and dealt with.

In addition, the reception control unit 34 judges the deterioration of the fire detector 12 based on the occurrence frequency, duration, and number of occurrences of false alarm side failures and non-report side failures received as failure diagnosis information from the fire detector 12, and notifies. to control. For example, when the occurrence frequency, duration, and number of occurrences of the false alarm side failure are high, the reception control unit 34 judges that the deterioration is progressing and notifies it, so that the person in charge can quickly strengthen inspection and formulate a replacement plan. etc. Further, the reception control unit 34 assumes that when the occurrence frequency, duration, number of occurrences, etc. of the failure on the failure alarm side is high, the deterioration progresses, but when the adjacent fire detector is sound, the urgency is relatively low. It is possible to make judgments and report signs of deterioration, so that the person in charge can strengthen inspections and formulate replacement plans with plenty of time to spare.

Further, the reception control unit 34 counts, for example, the number of occurrences of the false alarm side failure or the false alarm side failure based on the false alarm side failure or the false alarm side failure received as the failure diagnosis information from the fire detector 12, and a predetermined threshold When the number of times is reached, it is determined that the accumulation condition is satisfied, and it is judged as a sign of failure of the fire detector 12, and control is performed to notify.

In this case, since the erroneous failure is of high urgency, the reception control unit 34, for example, judges it as a failure sign without storing it and notifies it. On the other hand, failures on the non-reporting side are relatively low in urgency if the adjacent fire detectors are sound. This makes it possible to make detailed inspections and make replacement plans.

In addition, the reception control unit 34 determines that a failure sign (reliability reduction) of the fire detector 12 has been determined (including the case where a failure sign signal is received from the fire detector 12). When a fire signal is received from 12, it is judged as a non-fire report, and predetermined fire processing including a tunnel entry prohibition warning is not performed. For this reason, even if the fire detector 12, which is judged to be a sign of failure, transmits a fire signal due to an erroneous fire judgment, fire processing including, for example, a vehicle entry prohibition warning is not performed, thereby preventing the vehicle from suddenly stopping. Eliminates problems associated with non-fire alarms, such as the occurrence of accidents and traffic jams.

Further, when the reception control unit 34 determines a failure sign of the fire detector 12 (including a case where a failure sign signal is received from the fire detector 12), the reception control unit 34 transfers the failure sign to the remote monitoring and control equipment 32 shown in FIG. It controls the transmission of the information signal and the notification. As a result, the person in charge of the remote monitoring and control equipment 32 who is monitoring a plurality of tunnels can know that the reliability of the fire detector 12 is declining, and the fire caused by the fire detector 12 on the tunnel side can be detected. It is possible to appropriately grasp the monitoring status of the tunnel and use it for tunnel operation management.

Such a sign of failure is not only when the fire detection part of the fire detector 12 is malfunctioning, but also when there is an infrared source in the installation environment, for example, in the detection area 15. In some cases, it is caused by unnecessarily mixed in the test light, and the administrator who knows the sign of failure can take measures such as checking and removing unnecessary infrared sources as necessary.

[Modification of the present invention]
(fire detector)
In the above embodiment, a two-wavelength type fire detector is taken as an example, but other types may be used. For example, a three-wavelength type flame detector that detects radiation energy in a wavelength band near 2.3 μm in the same manner as the two-wavelength type, and determines the presence or absence of a flame based on the relative ratio of the received light signals in these three wavelength bands. It is good as

(P-type tunnel disaster prevention system)
The present invention can also be applied to a P-type tunnel disaster prevention system in which a fire detector is connected to each signal line from a disaster prevention receiving panel. In this case, the fire detector should carry out processing control by itself and send a failure sign as a pulse signal to the disaster prevention receiving panel.

(others)
The present invention can also be applied to disaster prevention systems other than tunnel disaster prevention systems.

The present invention includes appropriate modifications that do not impair its purpose and advantages, and is not limited by the numerical values shown in the above embodiments.

1a: Up line tunnel 1b: Down line tunnel 10: Disaster prevention receiver panel 12: Fire detectors 14a, 14b: Signal line 16: Fire pump equipment 18: Cooling pump equipment 20: IG slave station equipment 22: Ventilation equipment 24: Alarm display Board equipment 26: Radio rebroadcast equipment 28: Television monitoring equipment 30: Lighting equipment 32: Remote monitoring control equipment 34: Reception control units 36, 36b, 56: Transmission unit 46: Housing 48: Sensor storage units 50R, 50L: Transparent Optical windows 52R, 52L: Test light source transparent window 54: Detector control unit 56: Transmission unit 58: Power supply unit 60R, 60L: Fire detection unit 64: Flame detection sensors 66, 70: Amplification processing unit 68: Non-flame Detection sensor 72: Test light emission drive units 74R, 74L, 75R, 75L: Internal test light sources 76R, 76L: External test light sources 80: Fire determination unit 82: Sensitivity test unit 84: Dirt test unit 86: Failure diagnosis unit

Claims (8)

A fire detector equipped with a failure diagnosis unit that distinguishes between a false alarm side failure and a false alarm side failure according to a predetermined test result,
Based on the flame light reception signal and the non-flame light reception signal obtained during the test, the failure diagnosis unit
When the level of the flame receiving signal satisfies a predetermined first upper limit side judgment condition,
when the level of the non-flame light reception signal satisfies a predetermined first lower limit judgment condition, or
When the relative ratio between the level of the flame-receiving signal and the level of the non-flame-receiving signal satisfies a predetermined first relative ratio judgment condition,
Alternatively, identifying a combination of these as the false alarm side failure,
When the level of the flame receiving signal satisfies a predetermined second lower limit judgment condition,
when the level of the non-flame received light signal satisfies a predetermined second upper limit judgment condition, or
When the relative ratio between the level of the flame-receiving signal and the level of the non-flame-receiving signal satisfies a predetermined second relative ratio criterion,
Alternatively, a fire detector characterized in that a combination of these is identified as the failure on the failure to report side.
The fire detector according to claim 1,
The fire detector according to claim 1, wherein the failure diagnostic unit transmits a failure sign signal to a disaster prevention receiving panel when the failure on the false alarm side is identified and determined.
The fire detector according to claim 1,
The fire detector according to claim 1, wherein the fault diagnosis section transmits to a disaster prevention receiving panel a result of identification of the fault on the false alarm side and the fault on the non-report side identified according to the test result.
A tunnel disaster prevention system that monitors fire by connecting the fire detector according to any one of claims 1 to 3 to a disaster prevention receiver,
The fire detectors mutually overlap and monitor detection areas between other adjacent fire detectors,
The tunnel disaster prevention receiving panel is characterized in that, according to the identification result of the failure on the unreported side by the fire detector, the disaster prevention receiving panel is changed so as to increase the detection sensitivity of the other fire detectors arranged adjacently. system.
In the tunnel disaster prevention system according to claim 4,
The disaster prevention receiving panel judges deterioration of the fire detector based on the occurrence frequency, duration, and number of occurrences of the false alarm side failure and the non-alarm side failure identified by the fire detector, and issues a notification. Characteristic tunnel disaster prevention system.
In the tunnel disaster prevention system according to claim 4,
The disaster prevention receiving panel judges and notifies a sign of failure of the fire detector based on the identification result of the failure on the false alarm side or the failure on the unreported side identified by the fire detector. system.
In the tunnel disaster prevention system according to claim 6,
The disaster prevention receiver board determines that the fire signal transmitted from the fire detector is a non-fire alarm and does not perform a predetermined fire process when judging a sign of failure of the fire detector. Tunnel disaster prevention system.
In the tunnel disaster prevention system according to claim 7,
The tunnel disaster prevention system, wherein the disaster prevention receiving panel transmits a failure sign transfer signal to remote monitoring and control equipment to inform the remote monitoring and control equipment when it determines that the fire detector has failed.

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