Disaster prevention system

Abstract

To enable appropriate addressing by determining and notifying of a proceeding state of deterioration of a fire detector before a non-fire alarm is output.SOLUTION: Signal lines 14a, 14b led out from a fire prevention reception board 10 into a tunnel are connected to a fire detector 12 to monitor a fire. A deterioration determination unit 48 of the fire prevention reception board 10 determines the degree of deterioration of the fire detector 12 to allow the fire prevention reception board 10 to notify of the result. Regarding the determination of the degree of deterioration by the deterioration determination unit 48, a temperature, humidity and the like to be environmental stress of the fire detector 12 are measured, a deterioration count value is increased when a measurement value or a change amount thereof exceeds a predetermined value, and deterioration is determined and notified, when a total of a deterioration count value obtained by adding a deterioration count value due to aging deterioration reaches a deterioration threshold value, to prompt inspection, confirmation, investigation and the like.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a fire detector that is connected to a signal line drawn from a disaster prevention receiving panel to monitor fires in a tunnel. [Background technology]

[0002] 2. Description of the Related Art Conventionally, in tunnels for expressways and the like, fire detectors that monitor for fires are installed to protect people and vehicles from fire accidents that may occur within the tunnel, and the fire detectors are connected to signal lines drawn from a disaster prevention receiving panel.

[0003] The fire detectors have detection areas on both the left and right sides and are arranged consecutively along the length of the tunnel, for example at intervals of 25 m or 50 m, so that the detection areas of adjacent fire detectors overlap in a mutually complementary manner.

[0004] In addition, the fire detector monitors radiation, such as infrared rays, from fire flames occurring inside the tunnel through a translucent window, and in order to maintain its flame monitoring function, sensitivity tests are conducted to monitor the sensitivity of the light-receiving element and dirt tests are conducted to monitor dirt on the translucent window.

[0005] In the sensitivity test of the light receiving element, when a test signal transmitted periodically from the disaster prevention receiving panel is received, test light equivalent to light from a simulated flame is incident on the light receiving element from a test light source to detect the light receiving sensitivity, and the received light value is corrected with a correction value which is the reciprocal of the detection sensitivity until the light receiving sensitivity drops to a predetermined threshold sensitivity.If the detection sensitivity drops to the predetermined sensitivity threshold and correction is no longer possible, a failure signal of the light receiving element is sent to the disaster prevention receiving panel to output a sensor failure alarm.

[0006] In the dirt test for the light-transmitting window, when a test signal transmitted periodically from the disaster prevention receiving panel is received, test light from a test light source installed outside the fire detector is incident on the light-transmitting window, the light is received by a light receiving element, and the light attenuation rate is calculated.If the light attenuation rate exceeds a predetermined dirt threshold, an abnormal dirt signal is sent to the disaster prevention receiving panel to output a dirt alarm. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 6-325271 [Patent Document 2] JP 2002-246962 A [Patent Document 3] Japanese Patent Application Publication No. 11-128381 [Patent Document 4] JP 2013-105370 A [Patent Document 5] Japanese Patent Application Publication No. 10-111989 [Patent Document 6] Japanese Patent Application Publication No. 10-255185 [Patent Document 7] Japanese Patent Application Publication No. 05-100890 Summary of the Invention

[0008] However, with such conventional fire detectors, after a long period of operation, even when they appear to be operating normally without any sensor failures due to sensitivity tests or abnormal dirt due to dirt tests being detected, there are cases where the fire detector suddenly outputs a fire detection signal and a non-fire alarm is issued from the disaster prevention receiving panel.Until it is confirmed that it is not a fire alarm, a fire occurrence must be displayed using an alarm display board or the like, vehicles must be prohibited from passing through the tunnel, and a person in charge must go to the site to check, which takes time and effort before traffic can be resumed through the tunnel, and there is a risk that the reliability of the tunnel disaster prevention system cannot be ensured.

[0009] The reason why a fire detector suddenly outputs a fire detection signal when it is operating normally is that it has deteriorated over a long period of operation, causing it to become unstable, and it is assumed that a malfunction of some kind in this state causes the fire detection signal to be output. However, the only information available on the extent of deterioration of a fire detector is the useful life indicated at the manufacturing stage, making it difficult to perform maintenance that corresponds to the deterioration of the fire detector.

[0010] An object of the present invention is to provide a disaster prevention system that enables appropriate measures to be taken by determining the degree of deterioration of a fire detector and reporting the degree of deterioration before a false fire alarm is issued. [Means for solving the problem]

[0011] (Disaster Prevention System) The present invention provides a disaster prevention system that monitors a fire in a detection area by providing a fire detector having a fire detection unit that detects light energy from the detection area, a detector control unit that performs a fire determination process to determine whether or not a fire has occurred in the detection area based on the light energy detected by the fire detection unit; a test unit that determines whether or not the fire detection unit has an abnormality in its sensitivity to detecting light energy through a predetermined test; a control unit which performs a fire alarm process to alert the fire in the detection area when the detector control unit determines that a fire has occurred through the fire determination process, and which determines the degree of deterioration of the fire detector that is an abnormality in the fire detector that leads to the output of a fire detection signal due to a malfunction of the fire detector or the output of a non-fire alarm by a disaster prevention system and is not tested by the testing unit; Equipped with The control unit The zero point of the fire detection signal for each fire detector is detected and stored as a zero point history, and the zero point history is displayed in a predetermined manner based on a predetermined operational instruction.

[0012] The disaster prevention system of the present invention continues the fire determination process by the detector control unit and the fire alarm process by the control unit at least until the degree of deterioration of the fire detector satisfies a predetermined deterioration alarm condition.

[0013] The control unit When the degree of deterioration of the fire detector satisfies the predetermined deterioration alarm condition, a control is performed to issue a deterioration alarm of the fire detector; When a deterioration alarm is issued or a non-fire alarm is output, the zero point history of a specific fire detector or all fire detectors is displayed, making it possible to confirm the deterioration status and the cause of the non-fire alarm.

[0014] The detector control unit transmits information for determining the degree of deterioration of the fire detector to the control unit, The control unit obtains and collects information from the detector control unit.

[0015] The degree of deterioration of a fire detector represents the degree of deterioration before the fire detector fails.

[0016] The control unit determines the degree of deterioration of the fire detector by dividing it into a number of stages. Effect of the Invention

[0017] (Basic effect) The present invention is a disaster prevention system in which a fire detector is connected to a signal line drawn from a disaster prevention receiving panel into a tunnel to monitor for fires. The system has a deterioration determination unit that determines the degree of deterioration of the fire detector, and the disaster prevention receiving panel is configured to report the degree of deterioration of the fire detector determined by the deterioration determination unit.Since the degree of deterioration of the fire detector that occurs over the extended operation period of the system is determined and reported, it is possible to grasp the progress of deterioration of the fire detector, and it is possible to take measures such as replacing a deteriorating fire detector with a spare fire detector before the deterioration progresses to the point where a non-fire alarm is suddenly issued, making it possible to prevent malfunctions and non-fire alarms and continuously maintain the reliability of fire monitoring even if the operation period of the system is extended.

[0018] (Effect of environmental stress and period of use on deterioration assessment) In addition, the deterioration assessment unit is configured to determine the degree of deterioration based on the environmental stress and period of use of the fire detector, so that a deterioration assessment is made that takes into account both the environmental stress that causes mechanical and electrical stress that are factors in deterioration that lead to malfunctions of the fire detector or non-fire alarms, and the deterioration over time corresponding to the period of use, making it possible to obtain a more accurate assessment of the deterioration status.

[0019] (Effect of environmental stress on deterioration assessment) In addition, the deterioration determination unit measures environmental stress that indicates the operating environment of the fire detector, and increases a deterioration count value that indicates the degree of deterioration when the environmental stress or its change exceeds a predetermined value, and when the deterioration count value reaches a predetermined deterioration threshold, it alerts the user to a deterioration situation corresponding to the deterioration threshold.Therefore, the degree of deterioration of the fire detector due to environmental stress is constantized by generating the deterioration count value, making it possible to more accurately determine the progress of deterioration of the fire detector.

[0020] (Effect of Deterioration Assessment Using Multiple Types of Environmental Stress) In addition, the deterioration determination unit measures multiple types of environmental stresses that indicate the operating environment of the fire detector, and increases a deterioration count value indicating the degree of deterioration for each of the multiple types of environmental stresses when each environmental stress or its change exceeds a predetermined value, and when the sum of the deterioration count values ​​obtained for each of the multiple types of environmental stresses reaches a predetermined deterioration threshold, it alerts the user to the deterioration status corresponding to the deterioration threshold.Therefore, by determining the deterioration of the fire detector taking into account multiple types of environmental stresses that are factors in the deterioration of the fire detector, it is possible to make a highly accurate determination that matches the actual progress of deterioration.

[0021] (Effects of environmental stress types) In addition, the deterioration assessment unit is configured to measure at least one of the temperature, humidity, impact vibration, and electrical noise of the fire detector as environmental stresses.Since temperature, humidity, and impact vibration cause deterioration to progress due to mechanical stress, and electrical noise causes deterioration to progress due to electrical stress, by measuring temperature, humidity, impact vibration, and electrical noise as environmental stresses, it is possible to make a highly accurate assessment that matches the actual degree of deterioration.

[0022] (Effect of units of measurement of environmental stress) In addition, since the deterioration determination unit is configured to measure environmental stress for each fire detector, or for each specified section where multiple fire detectors are installed, for example, temperature stress can be measured by providing a temperature sensor for each fire detector, but by providing sensors that measure humidity, impact vibration or electrical noise for each section within the tunnel where multiple fire detectors are installed, environmental stress can be measured without installing more sensors than necessary.

[0023] (Effect of environmental stress and period of use on deterioration assessment) In addition, the deterioration determination unit generates a deterioration count value corresponding to the period of use of the fire detector, and when the sum of this and the deterioration count value generated from environmental stress reaches a predetermined deterioration threshold, it notifies the deterioration status corresponding to the deterioration threshold.Therefore, by pre-determining the deterioration count value corresponding to the period of use, it is possible to accurately determine deterioration based on the deterioration count value that includes both environmental stress and period of use, even for deterioration over time corresponding to the period of use.

[0024] (Effect of informing the necessity of inspection, confirmation or investigation) In addition to notifying of the deterioration status, the deterioration assessment unit is configured to notify of the need to inspect, check or investigate the fire detector for which a deterioration status has been reported. This allows personnel at a disaster prevention center, etc., to inspect, check or investigate the fire detector for which a deterioration status has been reported, and take appropriate action such as replacing it with a spare fire detector based on the results.

[0025] (Effect of multi-stage notification of deterioration status) In addition, the deterioration judgment unit sets a predetermined deterioration threshold in multiple stages, and each time the deterioration count value reaches the deterioration threshold of each stage, a deterioration status corresponding to the deterioration threshold of each stage is notified.Therefore, depending on the degree of deterioration, notifications are given in multiple stages, such as ``Caution: Deterioration'' and ``Abnormal Deterioration,'' making it possible to take appropriate action according to the degree of deterioration.

[0026] (Effect of notifying deterioration status for each environmental stress) In addition, the deterioration determination unit is configured to report the deterioration status separately for each environmental stress of the fire detector, so that when deterioration is reported it is clear whether the deterioration has been determined to be due to temperature, humidity, impact vibration or electrical noise. For example, if deterioration has been determined to be due to temperature stress, it becomes possible to take measures to reduce temperature fluctuations so as to suppress deterioration of the fire detector due to temperature stress.

[0027] (Effect of updating deterioration thresholds based on fire detector test anomalies) In addition, when a test abnormality is determined in any of the multiple fire detectors, the deterioration determination unit updates the deterioration threshold based on the deterioration count value of the fire detector in which the test abnormality was determined.Therefore, if the deterioration count value of the fire detector that has experienced a test abnormality is known, this deterioration count value or a count value close to it can be updated as the deterioration threshold, and deterioration can be determined before a test abnormality is determined, allowing appropriate action to be taken.

[0028] (Effect of updating deterioration thresholds based on non-fire alarms of fire detectors) In addition, when a non-fire alarm occurs in any of the multiple fire detectors, the deterioration determination unit updates the deterioration threshold based on the deterioration count value of the fire detector in which the non-fire alarm occurred.Therefore, if the deterioration count value of the fire detector in which a non-fire alarm occurred is known, this deterioration count value or a count value close to it can be updated as the deterioration threshold, and deterioration can be determined before a non-fire alarm is issued, allowing appropriate action to be taken.

[0029] (Effect of displaying a list of deterioration status) In addition, the deterioration assessment unit is configured to display a list of the deterioration status of fire detectors based on specified operational instructions, so that, as necessary, when a deterioration abnormality is reported or a non-fire alarm is issued, the person in charge, etc. can check the progression of deterioration and the cause of non-fire, etc. by displaying a list of the deterioration status of a specific fire detector or all fire detectors, etc. on the disaster prevention receiving panel.

[0030] (Effects of listing environmental stresses) In addition, the deterioration assessment unit is configured to display a list of the environmental stresses of fire detectors based on specified operational instructions, so that, if necessary, when a deterioration abnormality is reported or a non-fire alarm is issued, the person in charge can check the progress of deterioration and the causes of non-fires, etc. by displaying a list of the environmental stresses of a specific fire detector or all fire detectors, etc. on the disaster prevention receiving panel.

[0031] (Effect of listing by type of environmental stress) Based on specified operating instructions, the deterioration determination unit displays a list of multiple types of environmental stress measured from the fire detector, categorized by type, so that, if necessary, when a deterioration abnormality is reported or a non-fire alarm is issued, the person in charge can check the progress of deterioration and whether the main cause of non-fire is the degree of environmental stress by displaying the temperature, humidity, and environmental stress categorized by type, such as temperature, humidity, shock vibration, and electrical noise, for a specific fire detector or all fire detectors on the disaster prevention receiving panel, and take the necessary measures.

[0032] (Effect of manually changing the deterioration judgment threshold) In addition, since the deterioration judgment unit is configured to change the deterioration threshold value based on specified operational instructions, the person in charge can change the deterioration threshold value to a higher value to suppress the occurrence of frequent deterioration abnormalities when deterioration abnormalities are reported but there are no non-fire alarms, and on the other hand, when there are frequent non-fire alarms without deterioration abnormalities being reported, the person in charge can change the deterioration threshold value to a lower value so that deterioration abnormalities are reported before non-fire alarms are issued.

[0033] (Effect of fire detector operation history) In addition, the deterioration determination unit stores the operation history of each fire detector and displays the operation history based on specified operational instructions, so that, if necessary, when a deterioration abnormality is reported or a non-fire alarm is issued, the person in charge can check the deterioration status and causes of non-fires by displaying the operation history of a specific fire detector or all fire detectors on the disaster prevention receiving panel.

[0034] (Effect of fire detector zero point history) In addition, the deterioration determination unit detects the zero point of the fire detection signal for each fire detector and stores it as a zero point history, and displays the zero point history of the fire detection signal based on specified operation instructions. Therefore, if necessary, when a deterioration abnormality is reported or a non-fire alarm is issued, the person in charge can check the deterioration status and the cause of the non-fire, etc. by displaying the zero point history of a specific fire detector or all fire detectors, etc. on the disaster prevention receiving panel. [Brief description of the drawings]

[0035] [Figure 1] An explanatory diagram showing the overview of the tunnel disaster prevention system [Diagram 2] Block diagram showing the outline of the functional configuration of the disaster prevention receiving panel [Diagram 3] A time chart showing the changes in temperature deterioration count value, humidity deterioration count value, aging deterioration count value, and total deterioration count value over the period of use. [Figure 4] An explanatory diagram showing the appearance of a fire detector [Diagram 5] Block diagram showing the outline of the functional configuration of a fire detector [Figure 6] A time chart showing the change in temperature deterioration count value in relation to daily temperature changes. [Figure 7] A flow chart showing the control operation of the deterioration determination unit installed in the disaster prevention control panel. [Figure 8] A flowchart showing the control operation of the deterioration determination unit following FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] [Outline of tunnel disaster prevention system] Fig. 1 is an explanatory diagram showing an overview of a tunnel disaster prevention system. As shown in Fig. 1, an up-line tunnel 1a and a down-line tunnel 1b are constructed as tunnels for a motorway.

[0037] Inside the up-line tunnel 1a and the down-line tunnel 1b, fire detectors 12 are installed along the walls in the longitudinal direction of the tunnels, for example at intervals of 25 meters or 50 meters.

[0038] Fire detector 12 has two sets of fire detection units, so that it has detection areas in both the upward and downward directions of the tunnel longitudinal direction, and is continuously arranged along the longitudinal direction of the tunnel so that the detection areas of adjacent fire detectors overlap in a complementary manner, and detects fires by observing radiation, such as infrared rays, from flames caused by a fire within the detection area.

[0039] In addition, emergency facilities such as manual reporting devices and emergency telephones for reporting fires, fire hydrant devices for extinguishing fires and preventing the spread of fires, and water sprayers that spray fire water from water spray heads to protect the tunnel structure and ducts from fires are also installed in the up-bound tunnel 1a and the down-bound tunnel 1b, but these are omitted from the illustration.

[0040] From the disaster prevention receiving panel 10, transmission lines 14a, 14b including power lines are extended to the up-line tunnel 1a and the down-line tunnel 1b, and a fire detector 12 is connected to the transmission lines 14a, 14b, and a unique address is set for each line of the fire detector 12.

[0041] In addition, the disaster prevention receiving panel 10 is provided with a 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, lighting equipment 30, etc., and except for the IG slave station equipment 20 which is connected by a data transmission line, the other equipment is individually connected to the disaster prevention receiving panel 10 by P-type signal lines. Here, the IG slave station equipment 20 is a communication equipment which connects the disaster prevention receiving panel 10 with remote monitoring and control equipment 32, which is a higher-level equipment provided externally, via a network.

[0042] The ventilation equipment 22 is a facility that imparts energy to the air inside the tunnel by operating jet fans installed on the ceiling side of the tunnel to blow air at high speeds, thereby creating a ventilation flow in the longitudinal direction of the tunnel.

[0043] The warning display board equipment 24 is equipment that notifies users in the tunnel of any abnormalities inside the tunnel by displaying them on an electric display board. The radio rebroadcast equipment 26 is equipment that enables drivers and others in the tunnel to receive information from the road administrator. The television monitoring equipment 28 is equipment for checking the scale and location of a fire, activating the water spray equipment, and grasping the situation inside the tunnel when providing evacuation guidance. The lighting equipment 30 is equipment that drives and manages the lighting equipment in the tunnel.

[0044] [Disaster prevention receiving panel] (Outline of disaster prevention receiving panel configuration) Fig. 2 is a block diagram showing an outline of the functional configuration of the disaster prevention receiving panel. As shown in Fig. 2, the disaster prevention receiving panel 10 includes a panel control unit 34, which is a function realized by, for example, executing a program, and uses, as hardware, a computer circuit equipped with a CPU, memory, various input / output ports, etc.

[0045] Transmission units 36a, 36b are provided for the panel 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 transmission lines 14a, 14b drawn from the transmission units 36a, 36b, respectively.

[0046] In addition, the panel control unit 34 is provided with an alarm unit 38 equipped with a speaker, alarm indicator lights, etc., a display unit 40 equipped with an LCD display, a printer, etc., an operation unit 42 equipped with various switches, etc., and a modem 44 connecting the IG child station equipment 20 which communicates with external monitoring equipment, and further provided with an IO unit 46 to which 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 Figure 1 are connected.

[0047] The panel control unit 34 instructs the transmission units 36a, 36b to repeatedly send a call signal including a polling command that sequentially specifies the addresses of the fire detectors 12, and when the fire detector 12 receives a call signal that matches its own address, it replies with a response signal including its own status information such as fire detection, test results, temperature, humidity, etc.

[0048] In addition, when the panel control unit 34 of the disaster prevention receiving panel 10 detects a fire by receiving a response signal from the fire detector 12, it controls the alarm unit 38 to output a fire alarm and also instructs the linkage control of other equipment via the IO unit 46.

[0049] Furthermore, when the system is started up or at predetermined intervals during operation, the panel control unit 34 transmits a test signal containing a test instruction command sequentially specifying the addresses of the fire detectors 12, controls the fire detectors 12 to perform sensitivity tests, contamination tests, and deterioration tests, and controls the fire detectors 12 to respond with the results of each test. Also, a test signal can be transmitted to individual fire detectors to perform tests by a test operation specifying the address of a specific fire detector 12 using the operation unit 42.

[0050] In addition, when the panel control unit 34 receives a response signal of a sensor failure obtained by a sensitivity test of the fire detector 12, it controls the alarm unit 38 to issue an alarm of a sensor failure with the specified address of the fire detector, by sounding an alarm, by displaying an alarm on the display unit 40, and by printing.

[0051] In addition, when the panel control unit 34 receives a response signal indicating a contamination abnormality obtained by a sensitivity test of the fire detector 12, it controls the alarm unit 38 to sound an alarm, the display unit 40 to display a contamination alarm with the specified address of the fire detector, and the display unit 40 to print the alarm.

[0052] In addition, when the panel control unit 34 receives a response signal indicating a failure or abnormality obtained by the sensitivity test and dirt test of the fire detector 12, it transmits the signal from the modem 44 to the remote monitoring and control equipment 32 via the IG substation equipment 20 shown in Figure 1, and controls the issuance of a failure alarm or abnormality alarm.

[0053] Furthermore, the panel control unit 34 performs control to change the threshold values ​​for determining sensitivity abnormalities and contamination abnormalities set in the fire detectors 12 based on the operation of the operation unit 42 using the display of the display unit 40. This control to change the threshold values ​​can change the threshold values ​​of the fire detectors 12 all at once, or can change the threshold value of a specific fire detector 12 by specifying an address.

[0054] In the following description, the transmission paths 14a, 14b and the transmission units 36a, 36b may be referred to as the transmission path 14 and the transmission unit 36 ​​when there is no need to distinguish between them.

[0055] (Deterioration judgment section of disaster prevention receiving panel) The panel control unit 34 of the disaster prevention receiving panel 10 is provided with a function of a deterioration determination unit 48 that determines and reports the degree of deterioration of the fire detectors 12 installed in the tunnel. The deterioration determination unit 48 of this embodiment determines the degree of deterioration of the fire detectors 12 based on the environmental stress and the period of use.

[0056] For this reason, the deterioration determination unit 48 measures, for example, temperature and humidity as multiple types of environmental stresses that indicate the operating environment of the fire detector 12, and increases a temperature deterioration count value P1, which indicates the degree of deterioration due to temperature, by one when the measured temperature or its change exceeds a predetermined value, and also increases a humidity deterioration count value P2, which indicates the degree of deterioration due to humidity, by one when the measured humidity or its change exceeds a predetermined value.

[0057] In this embodiment, the temperature deterioration count P1 and humidity deterioration count P2 are obtained on the fire detector 12 side and sent to the disaster prevention receiving panel 10. For this reason, the panel control unit 34 instructs the transmission units 36a, 36b at predetermined intervals to transmit a measurement instruction signal sequentially specifying the addresses of the fire detectors 12, and the fire detector 12 that receives a measurement instruction signal that matches its own address sets the temperature deterioration count P1 and humidity deterioration count P2 being obtained at that time in a response signal and transmits it as environmental stress measurement information, and the panel control unit 34 receives the response signal to obtain the temperature deterioration count value P1 and humidity deterioration count value P2.

[0058] The deterioration determination unit 48 also generates an aging deterioration count value P3 indicating aging deterioration corresponding to the period of use of the fire detector 12. The aging deterioration count value P3 is predetermined as a value that increases, for example, in units of years, with the service life of the fire detector 12 being the maximum period of use.

[0059] FIG. 3 is a time chart showing the changes over time in the temperature deterioration count value P1, humidity deterioration count value P2, age deterioration count value P3, and total deterioration count value P, which are used in deterioration determination. For ease of explanation, the chart shows a linear increase relative to the years on the horizontal axis.

[0060] The deterioration determination unit 48 adds the temperature deterioration count value P1, the humidity deterioration count value P2, and the aging deterioration count value P3 to calculate the total deterioration count value P, and determines deterioration when the total deterioration count value P reaches a predetermined deterioration threshold value Pth, and controls the alarm unit 38 to sound a deterioration alarm, the display unit 40 to display a deterioration alarm that identifies the address of the fire detector 12, and the display unit 40 to print a deterioration alarm.

[0061] In addition to issuing a deterioration alarm, the deterioration determination unit 48 also controls the alarm unit 38 to sound an alarm, the display unit 40 to display information on the display unit 40, and / or to print information indicating the need for inspection, confirmation or investigation, specifying the address of the fire detector 12 that has been determined to be deteriorated.

[0062] The deterioration threshold value Pth may be set to two stages, for example, Pth1 and Pth2. In this case, when the deterioration count value sum P reaches the first stage deterioration threshold value Pth1, the deterioration determination unit 48 performs control to notify the deterioration state by issuing an alarm sound from the alarm unit 38, displaying on the display unit 40, and printing a deterioration warning that identifies the address of the fire detector 12.

[0063] In addition, when the deterioration count value sum P reaches a second-stage deterioration threshold Pth2 that is higher than the first-stage deterioration threshold Pth2, the deterioration judgment unit 48 controls the display unit 40 to issue a deterioration alarm that identifies the address of the fire detector 12 by sounding an alarm, displaying it on the display, or printing it, as an indication of the deterioration situation.

[0064] Further, the deterioration determination unit 48 performs the deterioration determination based on the deterioration count value sum P, as well as on each of the temperature deterioration count value P1, the humidity deterioration count value P2, and the aging deterioration count value P3.

[0065] That is, as shown in FIG. 3, the deterioration determination unit 48 determines deterioration due to temperature stress when the temperature deterioration count value P1 reaches a predetermined temperature deterioration threshold value (P1)th, and controls the alarm unit 38 to sound a temperature deterioration alarm, the display unit 40 to display an alarm, and the display unit 40 to print an alarm that identifies the address of the fire detector 12.

[0066] In addition, the deterioration determination unit 48 determines deterioration due to humidity stress when the humidity deterioration count value P2 reaches a predetermined humidity deterioration threshold value (P2)th, and controls the alarm unit 38 to sound a humidity deterioration alarm, which identifies the address of the fire detector 12, and the display unit 40 to display the alarm, or to print the alarm.

[0067] Furthermore, the deterioration determination unit 48 determines the occurrence of deterioration when the deterioration count value P2 reaches a predetermined deterioration threshold value (P3)th, and controls the issuance of an deterioration alarm specifying the address of the fire detector 12 by an alarm sound from the alarm unit 38, a display display on the display unit 40, and printing.

[0068] By issuing a deterioration alarm corresponding to the deterioration cause in this manner, it is possible to determine whether the main cause of deterioration is temperature stress, humidity stress, or aging, and measures can be taken to remove the deterioration cause for the fire detector 12 determined to be deteriorated, thereby making it possible to slow down the progression of deterioration over time.

[0069] In addition, for the deterioration judgment for each of the temperature deterioration count value P1, the humidity deterioration count value P2, and the aging deterioration count value P3, the judgment threshold may be set in two stages, and a deterioration caution may be issued for a deterioration judgment based on the first stage judgment threshold, and a deterioration alarm may be issued for a deterioration judgment based on a second stage judgment threshold higher than the first stage judgment threshold. Also, a representative notification may be issued for the deterioration caution or deterioration alarm based on any of the temperature deterioration count value P1, the humidity deterioration count value P2, and the aging deterioration count value P3.

[0070] Furthermore, when the deterioration determination unit 48 receives a response signal of a sensor failure obtained by a sensitivity test of the fire detector 12 in the panel control unit 34, it performs control to update the deterioration threshold value based on the deterioration count value of the fire detector 12 determined to have a sensor failure. This is because when the system starts operating, the deterioration threshold value is a value determined at the design stage and may not necessarily match the deterioration state of the system actually in operation, and the deterioration count value of the fire detector 12 determined to have a sensor failure can be used as a guideline for the threshold value for deterioration determination.

[0071] Taking the deterioration count value sum P as an example, if the initially set deterioration threshold value Pth is, for example, Pth=10000, and the deterioration count value P of the fire detector 12 determined to have a sensor failure is P=7500, then based on this, the deterioration threshold value Pth is updated to a lower value, for example, Pth=7000. This makes it possible to improve the function of determining and reporting deterioration before a sensor failure occurs for fire detectors 12 other than the fire detector that has experienced a sensor failure.

[0072] Furthermore, when the panel control unit 34 determines that the fire detector 12 is not a fire alarm, the deterioration determination unit 48 similarly performs control to update the deterioration threshold value based on the deterioration count value of the fire detector 12 that has become a non-fire alarm. Here, the deterioration determination unit 48 aims to determine deterioration and issue an alert before the fire detector 12 issues a non-fire alarm, but a non-fire alarm may be issued before that, so by updating the deterioration threshold value based on the deterioration count value of the fire detector 12 that has become a non-fire alarm, the function of determining deterioration and issuing an alert before a non-fire alarm is issued for other fire detectors 12 can be improved.

[0073] The deterioration threshold value in the deterioration determination unit 48 may be updated in response to an update operation instruction from the operation unit 42 in the event of a sensor failure or a non-fire alarm, or may be updated automatically.

[0074] [Fire detector] (Appearance of a fire detector) FIG. 4 is an explanatory diagram showing the external appearance of the fire detector, and FIG. 5 is a block diagram showing an outline of the functional configuration of the fire detector.

[0075] 4, the fire detector 12 has two pairs of light-transmitting windows 50R, 50L separated into left and right in a sensor housing section 51 provided in the upper part of the housing 49, and a sensor section is disposed in each of the light-transmitting windows 50R, 50L. In addition, two pairs of light-transmitting windows 52R, 52L for test light sources that house external test light sources used for soiling tests of the light-transmitting windows 50R, 50L are provided in positions near the light-transmitting windows 50R, 50L where the sensor sections can be seen through.

[0076] In the following description, the light-transmitting window 50R may be referred to as the right-eye light-transmitting window 50R, and the light-transmitting window 50L may be referred to as the left-eye light-transmitting window 50L.

[0077] (Outline of fire detector configuration) 5, the fire detector 12 is provided with a detector control unit 54, a transmission unit 56, a power supply unit 58, two sets of left and right fire detection units 60R, 60L, a test light emission driving unit 72, internal test light sources 74R, 75R and internal test light sources 74L, 75L used in sensitivity tests, and external test light sources 76R, 76L used in dirt tests. In the following description, the fire detection unit 60R may be referred to as the right eye fire detection unit 60R, and the fire detection unit 60L may be referred to as the left eye fire detection unit 60L.

[0078] The detector control unit 54 has a function realized by, for example, executing a program, and as hardware, a computer circuit equipped with a CPU, memory, various input / output ports, etc. is used.

[0079] The transmission unit 56 is connected to the transmission unit 36 ​​of the disaster prevention receiving panel 10 shown in FIG. 2 by the serial transmission line S and the serial transmission common line SC of the transmission path 14, and various signals are transmitted and received by serial transmission.

[0080] The power supply unit 58 receives power from the disaster prevention receiving panel 10 shown in Figure 2 via the power line B and power common line BC included in the transmission path 14, and a predetermined power supply voltage is supplied to, for example, the detector control unit 54, the transmission unit 56, the two sets of fire detection units 60R, 60L (left and right), and the test light emission driving unit 72.

[0081] The test light emission driver 72 is connected to internal test light sources 74R, 75R, 74L, and 75L used for sensitivity tests, and also to external test light sources 76R and 76L used for dirt tests, each of which is provided with an LED as a light emitting element.

[0082] (Fire detection section) The fire detection units 60R and 60L include sensor units 64 and 68 and amplification processing units 66 and 70. For example, in the case of the right fire detection unit 60R, a right light-transmitting window 50R provided on the detector cover is disposed in front of the sensor units 64 and 68, and light energy from an external detection area is incident on the sensor units 64 and 68 through the right light-transmitting window 50R.

[0083] The right eye fire detection unit 60R monitors fires, for example, by two-wavelength flame detection. The sensor unit 64 selectively transmits (passes) radiation of 4.4 to 4.5 μm, which is the resonance radiation band of CO2 specific to flames, from the light energy incident through the right eye light-transmitting window 50R using an optical wavelength bandpass filter, detects the energy of the radiation using a light receiving sensor and performs photoelectric conversion, and then performs predetermined processing such as amplification using an amplification processing unit 66 to convert it into a light receiving signal corresponding to the amount of energy and outputs it to the detector control unit 54.

[0084] The sensor unit 68 selectively transmits (passes) radiant energy of 5 to 6 μm from the light energy incident through the left eye transparent window 50L using an optical wavelength bandpass filter, detects the radiation energy using a light receiving sensor and performs photoelectric conversion, and then performs predetermined processing such as amplification using the amplification processing unit 70 to convert it into a received light signal corresponding to the amount of energy and outputs it to the detector control unit 54.

[0085] The amplification processing units 66 and 70 are provided with a preamplifier, a filter that passes the flame fluctuating frequency band, a power amplifier, and the like.

[0086] (Fire judgment) The detector control unit 54 is provided with the function of a fire determination unit 80 as a function realized by executing a program. The fire determination unit 80, for example, determines the presence or absence of a flame by taking a relative ratio of the light reception values ​​(light reception signal levels) output from the amplification processing units 66, 70 of the right eye fire detection unit 60R and comparing it with a predetermined threshold value. When a fire is detected by determining that there is a flame, it instructs the transmission unit 56 to set fire detection information in a response signal to a call signal that matches its own address and controls the transmission to be transmitted to the disaster prevention receiving panel 10.

[0087] (Sensitivity test) The detector control unit 54 is provided with the function of a sensitivity test unit 82 as a function realized by executing a program. The sensitivity test unit 82 operates when it receives a test signal specifying its own address from the disaster prevention receiving panel 10 via the transmission unit 56, and instructs the test light emission driving unit 72 to sequentially drive the internal test light sources 74R, 75R, 74L, and 75L to emit light to perform a sensitivity test of the fire detection units 60R and 60L.

[0088] For example, in the case of a sensitivity test of the circuit system of the sensor unit 64 and the amplification processing unit 66 in the right eye fire detection unit 60R, the test light emission driving unit 72 drives the internal test light sources 74R and 75R to emit light, thereby causing simulated flame light equivalent to a fire flame to be incident on the sensor unit 64. The simulated flame light from the internal test light source 74R contains radiation energy of 4.4 to 4.5 μm that is specific to a flame and received by the sensor unit 64, and 5 to 6 μm that is received by the sensor unit 68, and has a fluctuation frequency of 8 to 12 Hz that is specific to a flame.

[0089] The sensitivity test section 82 performs a sensitivity test for each of the circuit blocks of the sensor section 64 and the amplification processing section 66, and the circuit block of the sensor section 68 and the amplification processing section .

[0090] For example, in the sensitivity test of the circuit blocks of the sensor unit 64 and the amplification processing unit 66, a reference light reception value that is initially set at the time of shipment from the factory is stored in memory, and the detected light reception value obtained in the sensitivity test at system startup matches the reference light reception value, and the detection sensitivity obtained by dividing the detected light reception value by the reference light reception value is 1. As the operation period passes, the detected light reception value gradually decreases, and the detection sensitivity decreases to 0.9, 0.8, 0.7, and so on.

[0091] In this manner, when the detection sensitivity falls below 1, the sensitivity testing unit 82 determines the detection sensitivity through a sensitivity test, and also determines a correction value which is the inverse of the detection sensitivity and stores it in memory. The sensitivity is then corrected by multiplying the received light value detected during subsequent operation by the correction value, and the fire judgment unit 80 judges a fire based on the sensitivity-corrected received light value.

[0092] Furthermore, the sensitivity test unit 82 is preset with a sensitivity threshold value corresponding to the limit at which sensitivity correction becomes impossible, for example a sensitivity threshold value of 0.5, and when the detection sensitivity determined in the sensitivity test is equal to or lower than the sensitivity threshold value, it determines that the failure is due to an abnormality in the sensitivity of the sensor unit 64, and instructs the transmission unit 56 to set sensor failure information in a response signal to a call signal matching its own address and transmit the response signal to the disaster prevention receiving panel 10. Note that in order to ensure a reliable determination of sensor failure, the sensitivity test unit 82 may transmit a response signal setting the sensor failure if it determines that the failure is due to an abnormality in sensitivity multiple times in succession.

[0093] A sensitivity test of the circuit system of the sensor section 68 and the amplification processing section 70 in the left fire detection section 60L is also performed in a similar manner by driving the internal test light sources 74L and 75L to emit light using the test light emission driving section 72.

[0094] (Stain test) The detector control unit 54 is provided with the function of a dirt test unit 84 as a function realized by executing a program. The dirt test unit 84 operates when it receives a test signal specifying its own address from the disaster prevention receiving panel 10 via the transmission unit 56, and instructs the test light emission driving unit 72 to sequentially drive the external test light sources 76R, 76L to emit light to perform a dirt test on the light-transmitting windows 50R, 50L.

[0095] For example, in the case of a stain test on the light-transmitting window 50R, the test light emission driving unit 72 drives the external test light source 76R to emit light, thereby causing simulated flame light equivalent to a fire flame to be incident on the sensor unit 64 through the light-transmitting window 50R. The simulated flame light from the external test light source 76R contains radiation energy of 4.4 to 4.5 μm specific to a flame received by the sensor unit 64 and 5 to 6 μm received by the sensor unit 68, and has a fluctuation frequency of 8 to 12 Hz specific to a flame.

[0096] The light-transmitting window 50R is free of dirt when shipped from the factory, and the light reception value obtained in a dirt test at that time is stored in memory as a reference light reception value, which is used to calculate the light attenuation rate.

[0097] The detected light reception value obtained in the dirt test at system startup matches the reference light reception value, and the light attenuation rate obtained by subtracting the detected light reception value from the reference light reception value and dividing the value by the reference light reception value is 0. As the operation period passes, dirt adheres to the light-transmitting window 50R, and the light attenuation rate gradually increases to 0.1, 0.2, 0.3, and so on.

[0098] When the light attenuation rate increases in this way, the dirt test unit 84 determines the light attenuation rate by a dirt test, and also determines a correction value which is the reciprocal of (1-light attenuation rate) and stores it in memory, and then performs dirt correction by dividing the light reception value detected in the subsequent operating 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 based on the dirt-corrected light reception value. Note that the light reception value detected in the operating state is corrected by the correction value obtained in the sensitivity test described above and the correction value obtained in the dirt test.

[0099] The dirt testing unit 84 also has a preset dirt threshold, for example a dirt threshold of 0.5, which is the light attenuation rate corresponding to the limit at which dirt correction is impossible. If the light attenuation rate determined in the sensitivity test is equal to or exceeds the dirt threshold, it determines that there is a dirt abnormality that makes it impossible to correct the dirt on the translucent window 50R, and instructs the transmission unit 56 to set dirt abnormality information in the response signal to a call signal that matches its own address and transmit it to the disaster prevention receiving panel 10.

[0100] (Environmental Stress Measurement Department) The detector control unit 54 is provided with the function of an environmental stress measurement unit 86, which is realized by executing a program, and a temperature sensor 88 and a humidity sensor 90 arranged within the fire detector 12 are connected to the detector control unit 54 in response to this.

[0101] The environmental stress measuring unit 86 reads the temperature detection signal of the temperature sensor 88 and the humidity detection signal of the humidity sensor 90 from the A / D conversion port at predetermined intervals, and performs control to store the measured temperature T and measured humidity H in memory.

[0102] 6 is a time chart showing the change in the temperature deterioration count value with respect to the daily change in the measured temperature. When the environmental stress measurement unit 86 stores the measured temperature T in memory, it compares the measured temperature T with a predetermined temperature threshold value Tth, and if the measured temperature T exceeds the predetermined temperature threshold value Tth, it performs control to increase the temperature deterioration count value P1 by, for example, 1.

[0103] The same is true for the measured humidity H. When the environmental stress measurement unit 86 stores the measured humidity H in memory, it compares the measured humidity H with a predetermined humidity threshold Hth, and if the measured humidity H exceeds the predetermined humidity threshold Hth, it performs control to increase the humidity degradation count value P2 by one.

[0104] In addition, when the environmental stress measurement unit 86 receives a measurement instruction signal specifying its own address from the disaster prevention receiving panel 10 via the transmission unit 56, it instructs the transmission unit 56 to set the temperature deterioration count value P1 and the humidity deterioration count value P2 as environmental stress measurement information in the response signal to the measurement instruction signal and transmit it to the disaster prevention receiving panel 10.

[0105] As another embodiment of the environmental stress measurement unit 86, the measured temperature for a predetermined period of time, for example a day's worth of temperature measurements, may be measured and stored in memory in predetermined time units, and when a measurement instruction signal specifying its own address is received from the disaster prevention receiving panel 10 via the transmission unit 56, the temperature change amount ΔT is calculated from the maximum and minimum values ​​of the measured temperature for the day, and if the temperature change amount ΔT exceeds a predetermined temperature threshold ΔTth, the temperature deterioration count value P1 is incremented by one, and the humidity change amount ΔH is calculated from the maximum and minimum values ​​of the measured humidity for the day, and if the temperature change amount ΔH exceeds a predetermined temperature threshold ΔHth, the temperature deterioration count value P2 is incremented by one, and the transmission unit 56 is instructed to set the temperature deterioration count value P1 and the humidity deterioration count value P2 in a response signal to the measurement instruction signal as environmental stress measurement information and transmit the response signal to the disaster prevention receiving panel 10.

[0106] [Deterioration determination operation by disaster prevention monitoring system] FIG. 7 is a flowchart showing the control operation of the deterioration determination unit provided in the disaster prevention control panel, and FIG. 8 is a flowchart showing the control operation of the deterioration determination unit following FIG. 7, which is a control operation by the deterioration determination unit 48 provided in the panel control unit 34 of the disaster prevention receiving panel 10 in FIG. 2.

[0107] As shown in FIG. 7, when the power of the disaster prevention receiving panel 10 is turned on and the system is started up, the deterioration determination unit 48 initializes the detector address A to A=0 as a predetermined initialization process in step S1, and also initializes various deterioration count values ​​P1, P2, P3, and P to zero, and then proceeds to step S2, where it is determined whether or not it is time to perform a deterioration determination, for example, once a day.

[0108] Once the timing for deterioration determination has been determined in step S2, the process proceeds to step S3, where the deterioration determination unit 48 instructs the transmission units 36a, 36b to transmit measurement instruction signals with sequentially specified addresses to the transmission paths 14a, 14b, and acquires the temperature deterioration count value P1 and the humidity deterioration count value P2 by receiving a response signal transmitted from the fire detector 12 with a matching address.

[0109] Next, the deterioration determination unit 48 compares the temperature deterioration count value P1 acquired from the fire detector 12 in step S4 with a predetermined temperature deterioration threshold value (P1)th, and if it determines that the temperature deterioration count value P1 exceeds the temperature deterioration threshold value (P1)th, it proceeds to step S5 and determines the temperature deterioration.

[0110] Next, the deterioration determination unit 48 compares the humidity deterioration count value P2 acquired from the fire detector 12 in step S6 with the humidity deterioration threshold value (P2)th, and if it determines that the humidity deterioration count value P2 exceeds the humidity deterioration threshold value (P2)th, it proceeds to step S7 and determines whether humidity deterioration has occurred.

[0111] Next, in step S8, the deterioration determination unit 48 obtains the aging deterioration count value P3 corresponding to the period of use up to the present and compares it with the aging deterioration threshold value (P3)th.If it determines that the aging deterioration count value P3 exceeds the aging deterioration threshold value (P3)th, it proceeds to step S9 and determines the aging deterioration.

[0112] Next, in step S10, the deterioration determination unit 48 obtains the deterioration count value sum P of the temperature deterioration count value P1, the humidity deterioration count value P2, and the aging deterioration count value P3, and compares it with the deterioration threshold value (P)th.If it determines that the deterioration count value sum P exceeds the deterioration threshold value (P)th, it proceeds to step S11 and determines the deterioration.

[0113] Next, proceeding to step S12 in FIG. 8, the deterioration determination unit 48 determines whether or not a deterioration determination has been obtained by the processing of steps S4 to S11. If it determines that a deterioration determination has not been obtained, proceeding to step S14, if it determines that this is not the final address, proceeding to step S15, incrementing address A by one, returning to step S3 in FIG. 7, and repeating the processing from step S3 for the next fire detector 12.

[0114] If it is determined in step S12 that deterioration has been determined, the process proceeds to step S13, where the deterioration determining unit 48 notifies the result of the deterioration determination by sounding and displaying a deterioration alarm.

[0115] Furthermore, when the final address is determined in step S14, address A is initialized to A=0 in step S16 and the process proceeds to step S17. When a response signal indicating a sensor failure obtained in the sensitivity test of the fire detector 12 is received and it is determined that there is a fire detector 12 with an abnormal test result, the process proceeds to step S18, and the deterioration determination unit 48 updates the deterioration threshold value based on the deterioration count value of the fire detector 12 determined to have a sensor failure.

[0116] Furthermore, if it is determined in step S19 that there is a fire detector 12 that has issued a non-fire alarm, the process proceeds to step S20, where the deterioration determination unit 48 updates the deterioration threshold value based on the deterioration count value of the fire detector 12 that has issued a non-fire alarm, and the process returns to step S2 in FIG. 7 to wait for the next deterioration determination timing.

[0117] [Modifications of the present invention] (Environmental Stress) In the above embodiment, the deterioration determination unit 48 measures temperature and humidity as environmental stresses and obtains the respective deterioration count values ​​to determine deterioration, but is not limited to this, and may also measure shock vibration and electrical noise as environmental stresses.

[0118] The impact vibration is measured by a vibration sensor, for example, and the impact deterioration count value P4 is increased when the detected vibration exceeds a predetermined threshold. Impact vibrations that increase the impact deterioration count value P4 include vehicle collision vibrations against a tunnel side wall or the like due to a vehicle accident and impact vibrations due to a large-scale earthquake, and are expected to impose a large mechanical stress on the fire detector 12.

[0119] In addition, electrical noise is detected by, for example, a voltage sensor or a current sensor as a surge applied to the fire detector from the outside, and the electrical noise degradation count value P5 is increased. Electrical noise that increases the electrical noise degradation count value P5 includes, for example, an induced surge caused by a lightning strike, etc., and is expected to cause a large mechanical stress on the fire detector 12.

[0120] The voltage sensor and current sensor that measure electrical noise are installed inside the fire detector 12, while the vibration sensor that measures impact vibration is installed inside a tunnel outside the fire detector 12. The vibration sensor is given a transmission function so that it is connected to a transmission path from the disaster prevention receiving panel 10. The measurement results of the impact vibration are sent from the vibration sensor to the disaster prevention receiving panel 10 to determine deterioration.

[0121] The impact deterioration count value P4 and electrical noise deterioration count value P5 measured in this manner are added to the temperature deterioration count value P1, humidity deterioration count value P2, and aging deterioration count value P3 shown in the above embodiment to obtain a total deterioration count value P, and if it exceeds a predetermined deterioration threshold value Pth set in advance, deterioration is determined and an alert is issued.

[0122] The deterioration determination unit 48 also sets a predetermined deterioration threshold value for each of the shock deterioration count value P4 and the electrical noise deterioration count value P5, and when this threshold value is exceeded, issues a warning indicating deterioration indicating shock deterioration or electrical noise deterioration.

[0123] (Increase in deterioration count) In the above embodiment, the deterioration determination unit 48 increases the temperature deterioration count value P1 or the humidity deterioration count value P2 by one count when the temperature or humidity or the change amount thereof exceeds a predetermined value, but is not limited to this and may increase the count by a number corresponding to the degree of deterioration caused to the fire detector 12 by environmental stress. For example, since the degree of deterioration caused by humidity stress is greater than that caused by temperature stress, the temperature is increased by one count, while the humidity is increased by a predetermined number of two or more counts.

[0124] The same is true for the impact degradation count value P4 and electrical noise degradation count value P5 described above. Since the degree of degradation due to impact and surge is high, the increase in the specified count number is set to be even larger than in the case of humidity.

[0125] (Measurement of environmental stress) In the above embodiment, to measure environmental stress, a temperature sensor and a humidity sensor are provided in the fire detector 12, and a temperature deterioration count value and a humidity deterioration count value are calculated from the temperature and humidity measurement results by the environmental stress measurement unit of the fire detector 12, and transmitted to the deterioration determination unit 48 of the disaster prevention receiving panel 10 to determine deterioration. However, this is not limited to this, and the temperature and humidity measurement results from the fire detector 12 may be sent to the deterioration determination unit 48 of the disaster prevention receiving panel 10, and the temperature deterioration count value and the humidity deterioration count value may be calculated in the deterioration determination unit 48.

[0126] In the above embodiment, a temperature sensor and a humidity sensor are provided inside the fire detector 12 to measure environmental stress, but the present invention is not limited to this. A temperature sensor and a humidity sensor with a transmission function may be provided inside a tunnel outside the fire detector 12, and the environmental temperature and humidity inside the tunnel in which the fire detector 12 is installed may be measured by the disaster prevention receiving panel 10 to determine deterioration. In this case, since the existing temperature sensor provided in the internal circuit of the fire detector 12 can be used as the temperature sensor, it is preferable to provide a humidity sensor not in the fire detector 12 but in the tunnel outside the fire detector 12.

[0127] In addition, when installing humidity sensors inside a tunnel, the tunnel can be divided into sections in which a certain number of fire detectors are installed, and a humidity sensor can be installed in each section, thereby reducing the number of humidity sensors relative to the number of fire detectors. The same applies to the vibration sensors described above.

[0128] (Displays a list of deterioration status) Furthermore, the deterioration determination unit 48 of the disaster prevention receiving panel 10 may display a list of the deterioration status on the display of the display unit 40 based on a predetermined operation instruction from the operation unit 42. This allows the person in charge, etc., to check the progress of deterioration and the cause of the non-fire by displaying a list of the deterioration status of a specific fire detector 12 or all fire detectors 12, etc. on the disaster prevention receiving panel 10 when a deterioration abnormality is reported or a non-fire alarm is issued, etc., as necessary.

[0129] (List of environmental stresses) Furthermore, the deterioration determination unit 48 of the disaster prevention receiving panel 10 may display a list of environmental stresses on the display of the display unit 40 based on a predetermined operation instruction from the operation unit 42. This allows the person in charge, etc., to check the progress of deterioration and the cause of non-fire, etc., by displaying a list of environmental stresses of a specific fire detector or all fire detectors, etc. on the disaster prevention receiving panel when a deterioration abnormality is reported or a non-fire alarm is issued, etc., as necessary.

[0130] (List by type of environmental stress) In addition, the deterioration determination section 48 of the disaster prevention receiving panel 10 may be configured to classify multiple types of environmental stress into groups based on a predetermined operational instruction from the operation section 42 and display a list on the display of the display section 40.

[0131] This allows personnel in charge, etc., to, as necessary, when an abnormality in deterioration is reported or a non-fire alarm is issued, by displaying the temperature, humidity, and environmental stress for a specific fire detector or all fire detectors, etc., divided into types such as temperature, humidity, shock / vibration, and electrical noise, etc., on the disaster prevention receiving panel, thereby enabling them to check the progress of deterioration and whether the main cause of non-fire is the degree of environmental stress, and take the necessary measures.

[0132] (Manual change of deterioration judgment threshold) In addition, in the above embodiment, the deterioration determination unit 48 of the disaster prevention receiving panel 10 changes the deterioration determination threshold when it determines a test abnormality or a non-fire alarm, but this is not limited to this, and the deterioration determination unit 48 of the disaster prevention receiving panel 10 may change the deterioration threshold based on a specified operation instruction from the operation unit 42.

[0133] This allows personnel in charge, for example, to change the deterioration threshold to a higher value in cases where deterioration abnormalities are reported but there are no non-fire alarms, thereby preventing frequent occurrence of deterioration abnormalities; on the other hand, in cases where there are frequent non-fire alarms without deterioration abnormalities being reported, the deterioration threshold can be changed to a lower value so that deterioration abnormalities are reported before non-fire alarms are issued.

[0134] (Fire detector operation history) In addition, the deterioration determination unit 48 of the disaster prevention receiving panel 10 may store the operation history of each fire detector 12 and display the operation history on the display of the display unit 40 based on a predetermined operation instruction from the operation unit 42.

[0135] This allows personnel in charge, etc., to check the deterioration status and causes of non-fires, etc., by displaying the operation history of a specific fire detector 12 or all fire detectors 12, etc. on the disaster prevention receiving panel 10, if necessary, when an abnormality in the deterioration of a fire detector 12 is reported or a non-fire alarm is issued, etc.

[0136] (Fire detector zero point history) In addition, the deterioration determination unit 48 of the disaster prevention receiving panel 10 may detect the zero point of the fire detection signal for each fire detector 12, for example the zero point of the fire detection signal output from the fire detection units 60R, 60L shown in Figure 5, store it in memory as a zero point history, and display the zero point history of the fire detector 12 on the display of the display unit 40 based on a predetermined operation instruction from the operation unit 42.

[0137] This allows personnel in charge, if necessary, to check the deterioration status or causes of non-fire by displaying the zero point history of specific fire detectors or all fire detectors on the disaster prevention receiving panel when an abnormal deterioration is reported or a non-fire alarm is issued.

[0138] (Fire detector) Although a two-wavelength fire detector has been used as an example, other methods may be used. For example, in addition to the two wavelengths mentioned above, a three-wavelength flame detector may be used which detects radiation energy in a wavelength band around 3.8 μm, which is on the shorter wavelength side of the 4.4 to 4.5 μm resonant radiation band of CO2, using a method similar to that of 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.

[0139] (P-type tunnel disaster prevention system) The above embodiment has shown a so-called R-type tunnel disaster prevention system that monitors for fires by connecting a fire detector with an address set to a transmission line pulled out from a disaster prevention receiving panel, but the present invention is not limited to this and also applies to a so-called P-type tunnel disaster prevention system in which signal lines are pulled out from the disaster prevention receiving panel on a fire detector basis and a fire detector is connected to each signal line.

[0140] In a P-type tunnel disaster prevention system, since information cannot be communicated between the disaster prevention receiving panel and the fire detector, the function of the deterioration determination unit shown in the above embodiment is provided for each fire detector, and when deterioration is determined by the deterioration determination unit of the fire detector, for example, the signal line is disconnected to send a deterioration determination signal to the disaster prevention receiving panel to notify of the deterioration.

[0141] (others) Furthermore, the present invention includes appropriate modifications that do not impair the objects and advantages of the present invention, and is not limited to the numerical values ​​shown in the above embodiment. [Explanation of symbols]

[0142] 1a: Up line tunnel 1b: Down line tunnel 10: Disaster prevention receiving panel 12: Fire detector 14a, 14b: Transmission line 16: Fire pump equipment 18: Cooling pump equipment 20:IG slave station equipment 22: Ventilation equipment 24: Alarm display board equipment 26: Radio rebroadcasting equipment 28: TV surveillance equipment 30: Lighting equipment 32: Remote monitoring and control equipment 34: Panel control unit 36,56:Transmission section 44: Modem 46: IO Department 48: Deterioration determination section 50R,50L: Translucent window 51: Sensor storage section 52R, 52L: Light-transmitting window for test light source 54: Detector control unit 58: Power supply section 60R, 60L: Fire detection unit 64, 68: Sensor section 66, 70: Amplification processing section 72: Test light emission driver 74R, 74L, 75R, 75L: Internal test light source 76R, 76L: External test light source 80: Fire judgment department 82: Sensitivity test section 84: Soil test section 86: Environmental Stress Measurement Department 88: Temperature sensor 90: Humidity sensor

Claims

1. A disaster prevention system that monitors a fire in a detection area by providing a fire detector having a fire detection unit that detects light energy from the detection area, a detector control unit that performs a fire determination process to determine whether or not a fire has occurred in the detection area based on the light energy detected by the fire detection unit; a test unit that determines whether the fire detection unit has an abnormality in the detection sensitivity of the light energy by a predetermined test; a control unit which performs a fire alarm process to alert the fire in the detection area when the detector control unit determines that a fire has occurred through the fire determination process, and which determines a degree of deterioration of the fire detector that is an abnormality of the fire detector that leads to a fire detection signal output due to a malfunction of the fire detector or a non-fire alarm output by the disaster prevention system and is not tested by the testing unit; Equipped with The control unit is A disaster prevention system characterized by detecting the zero point of the fire detection signal for each fire detector, storing it as a zero point history, and displaying the zero point history in a predetermined manner based on predetermined operational instructions.

2. The disaster prevention system according to claim 1, The control unit is When the degree of deterioration of the fire detector satisfies the predetermined deterioration alarm condition, control is performed to issue a deterioration alarm of the fire detector; A disaster prevention system characterized by displaying the zero point history of a specific fire detector or all fire detectors when the deterioration alarm is issued or the non-fire alarm is output, making it possible to confirm the deterioration status and the cause of the non-fire alarm.

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