Fire detector and disaster prevention system

Abstract

To provide a fire detector and a disaster prevention system that can determine the degree of deterioration of the fire detector and notify it before a non-fire alarm is issued, thereby enabling appropriate action.SOLUTION: A fire detector 12 includes: a detector control unit 54 having a function of incrementing a deterioration count value each time the measured environmental stress satisfies a predetermined condition; and a transmission unit 56 for transmitting a signal including the deterioration count value, in which at least one of vibration and electrical noise applied to the detector is measured as the environmental stress, the vibrations applied to the detector include collision vibrations associated with vehicle accidents and impact vibrations due to large-scale earthquakes, and the electrical noise applied to the detector is an external surge to the detector, including an induced surge due to a lightning strike. A disaster prevention system includes a fire detector 12 and a disaster prevention receiving board in which a deterioration determination unit receives the signal including the deterioration count value from the fire detector 12 via a signal line and determines the degree of the deterioration of the fire detector 12 based on the deterioration count value.SELECTED DRAWING: Figure 5

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 tunnels, and a disaster prevention system that includes the detector. [Background technology]

[0002] Conventionally, in tunnels for expressways and the like, fire detectors that monitor fires are installed to protect people and vehicles from fire accidents that occur within the tunnel, and these 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 placed 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 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] The sensitivity test of the light receiving element involves detecting the light receiving sensitivity by shining test light equivalent to the light from a simulated flame from a test light source into the light receiving element when a test signal transmitted periodically from the disaster prevention receiving panel is received, and correcting the light receiving value with a correction value that 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, causing a sensor failure alarm to be output.

[0006] In the contamination test for the light-transmitting window, when a test signal periodically transmitted 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 determined.If the light attenuation rate exceeds a predetermined contamination threshold, an abnormal contamination signal is sent to the disaster prevention receiving panel, and a contamination alarm is output. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 6-325271 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-246962 [Patent Document 3] Japanese Patent Application Publication No. 11-128381 [Patent Document 4] Japanese Patent Application Laid-Open No. 2013-105370 [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 Laid-Open No. 2003-067861 [Patent Document 8] Japanese Patent Application Laid-Open No. 2016-136101 [Patent Document 9] Japanese Patent Application Laid-Open No. 2002-174652 [Patent Document 10] Japanese Patent Application Laid-Open No. 2010-038838 [Patent Document 11] Japanese Patent Application Laid-Open No. 2011-249255 Summary of the Invention

[0008] However, with such conventional fire detectors, if they are used for a long period of time, even when they appear to be operating normally without any sensor failures detected in sensitivity tests or abnormal contamination detected in contamination tests, the fire detector may suddenly output a fire detection signal and a non-fire alarm may be issued from the disaster prevention receiving panel.Until it is confirmed that it is not a fire alarm, a fire alarm must be displayed using an alarm display board or the like to prohibit vehicles from passing through the tunnel, and a person in charge must go to the site to check, which takes time and effort to allow traffic through the tunnel to resume, 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 appears to be operating normally is that the detector has deteriorated over time and is no longer functioning properly, causing it to malfunction and output a fire detection signal.However, the only information available about the extent of deterioration of a fire detector is the service life indicated at the manufacturing stage, making it difficult to perform maintenance and management that takes into account the deterioration of the fire detector.

[0010] The present invention aims to provide a fire detector and a disaster prevention system equipped with said detector that can determine the degree of deterioration of the fire detector and notify the fire detector before a false fire alarm is issued, thereby enabling appropriate action to be taken. [Means for solving the problem]

[0011] (Fire detector) The present invention provides a fire detector, comprising: a detector control unit having a function of increasing a deterioration count value each time the measured environmental stress satisfies a predetermined condition; a transmitter for transmitting a signal including a deterioration count value; Equipped with At least one of vibration and electrical noise applied to the device itself is measured as the environmental stress; The vibrations that are applied to the vehicle itself include collision vibrations caused by vehicle accidents and shock vibrations caused by large-scale earthquakes. The electrical noise applied to the device itself is characterized by including an induced surge caused by a lightning strike, which is a surge applied to the device from the outside.

[0012] (Disaster prevention system) In another aspect of the present invention, there is provided a disaster prevention system, comprising: The aforementioned fire detectors, a deterioration determination unit that receives a signal including a deterioration count value transmitted from a transmission unit of the fire detector and determines a degree of deterioration of the fire detector based on the deterioration count value included in the signal; The present invention is characterized by the following features.

[0013] (Deterioration determination unit installed in the disaster prevention receiving panel) The deterioration determination unit is installed in the disaster prevention receiving panel connected to the fire detector by a signal line, A signal including the deterioration count value from the transmission unit of the fire detector is transmitted to the deterioration determination unit via a signal line. [Effects of the Invention]

[0014] (Basic effect) The present invention relates to a disaster prevention system that monitors fires by connecting fire detectors to signal lines drawn from a disaster prevention receiving panel into a tunnel. 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.As the degree of deterioration of the fire detector is determined and reported as the system's operation period extends, it is possible to grasp the progress of deterioration of the fire detector, and to take measures such as replacing a deteriorating fire detector with a spare fire detector before the deterioration progresses and a sudden false fire alarm is issued.This makes it possible to prevent malfunctions and false fire alarms and continuously maintain the reliability of fire monitoring even if the system operation period extends.

[0015] (Effect of environmental stress and period of use on determining deterioration) In addition, the deterioration determination unit determines the degree of deterioration based on the environmental stress and period of use of the fire detector. This makes it possible to obtain a more accurate determination of the deterioration status by performing a deterioration determination that takes into account both the environmental stress that causes mechanical and electrical stress that can lead to deterioration that can lead to malfunctions of the fire detector or non-fire alarms, and the deterioration over time that corresponds to the period of use.

[0016] (Effect of determining deterioration due to environmental stress) 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 the deterioration status corresponding to the deterioration threshold.Therefore, the degree of deterioration of the fire detector due to environmental stress is constantized by generating a deterioration count value, making it possible to more accurately determine the progress of deterioration of the fire detector.

[0017] (Effect of determining deterioration due to 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 for each of the multiple types of environmental stresses, increases a deterioration count value that indicates the degree of deterioration when each environmental stress or its change exceeds a predetermined value, and when the sum of the deterioration count values ​​calculated 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 that cause the fire detector to deteriorate, it is possible to make a highly accurate determination that matches the actual degree of deterioration.

[0018] (Effects of environmental stress types) In addition, the deterioration determination 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 through mechanical stress, and electrical noise causes deterioration to progress through electrical stress, measuring temperature, humidity, impact vibration, and electrical noise as environmental stresses enables highly accurate determination that matches the actual degree of deterioration.

[0019] (Effect of environmental stress measurement units) Furthermore, the deterioration determination unit measures environmental stress for each fire detector, or for each predetermined 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 a tunnel where multiple fire detectors are installed, environmental stress can be measured without installing more sensors than necessary.

[0020] (Effect of environmental stress and period of use on determining deterioration) 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 a deterioration count value corresponding to the period of use, it is possible to accurately determine deterioration based on a deterioration count value that includes both environmental stress and the period of use, even for deterioration over time corresponding to the period of use.

[0021] (Effect of informing the need for inspection, confirmation or investigation) In addition to notifying the deterioration status, the deterioration assessment unit also notifies the need for inspection, confirmation or investigation of the fire detector for which the deterioration status has been reported. This allows personnel at disaster prevention centers, etc. to inspect, confirm or investigate the fire detector for which the deterioration status has been reported, and take appropriate action based on the results, such as replacing it with a spare fire detector.

[0022] (Effect of multi-stage notification of deterioration status) In addition, the deterioration determination unit sets predetermined deterioration thresholds in multiple stages, and each time the deterioration count value reaches the deterioration threshold of each stage, it notifies the deterioration status corresponding to the deterioration threshold of each stage.Therefore, depending on the degree of deterioration, notifications are given in multiple stages, such as deterioration warning and deterioration abnormality, making it possible to take appropriate action according to the degree of deterioration.

[0023] (Effect of informing the deterioration status for each environmental stress) In addition, the deterioration determination unit reports the deterioration status separately for each environmental stress of the fire detector, so 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 is determined to be due to temperature stress, measures can be taken to reduce temperature fluctuations so as to suppress deterioration of the fire detector due to temperature stress.

[0024] (Effect of updating deterioration thresholds based on fire detector test anomalies) Furthermore, 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 in which the test abnormality 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 the test abnormality is determined, allowing appropriate action to be taken.

[0025] (Effect of updating the deterioration threshold based on non-fire alarms of fire detectors) Furthermore, when a non-fire alarm is generated 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 that generated the non-fire alarm. Therefore, if the deterioration count value of the fire detector that generated the non-fire alarm 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 generated, allowing appropriate action to be taken.

[0026] (Effect of displaying a list of deterioration status) In addition, the deterioration determination unit is configured to display a list of the deterioration status of fire detectors based on specified operating instructions, so that, as 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 cause of non-fires by displaying a list of the deterioration status of a specific fire detector or all fire detectors on the disaster prevention receiving panel.

[0027] (Effects of listing environmental stresses) In addition, the deterioration determination unit displays a list of the environmental stresses of fire detectors based on specified operating 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 by displaying a list of the environmental stresses of a specific fire detector or all fire detectors on the disaster prevention receiving panel.

[0028] (Effect of listing each 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, separated by type. Therefore, when a deterioration abnormality is reported or a non-fire alarm is issued, the person in charge can, as necessary, check the progress of deterioration and whether the main cause of non-fires is the degree of environmental stress by displaying the temperature, humidity, and environmental stress separated 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.

[0029] (Effect of manually changing the degradation threshold) In addition, the deterioration determination unit changes the deterioration threshold based on specified operation instructions, so that if a deterioration abnormality is reported but there are no non-fire alarms, the person in charge can change the deterioration threshold to a higher value to prevent frequent deterioration abnormalities, and on the other hand, if there are frequent non-fire alarms without any deterioration abnormalities being reported, the person in charge can change the deterioration threshold to a lower value so that a deterioration abnormality is reported before a non-fire alarm is issued.

[0030] (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 operating 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 the cause of the non-fire by displaying the operation history of a specific fire detector or all fire detectors on the disaster prevention receiving panel.

[0031] (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 operating 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 by displaying the zero point history of a specific fire detector or all fire detectors on the disaster prevention receiving panel. [Brief explanation of the drawings]

[0032] [Figure 1] An explanatory diagram showing the overview of the tunnel disaster prevention system [Figure 2] Block diagram showing the functional configuration of the disaster prevention receiving panel [Figure 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 [Figure 5] Block diagram showing the functional configuration of a fire detector [Figure 6] Time chart showing the change in temperature deterioration count value in relation to daily temperature changes [Figure 7] Flowchart showing the control operation of the deterioration determination unit installed in the disaster prevention control panel [Figure 8] Flowchart showing the control operation of the deterioration determination unit following FIG. 7 DETAILED DESCRIPTION OF THE INVENTION

[0033] [Outline of the tunnel disaster prevention system] Figure 1 is an explanatory diagram showing an overview of a tunnel disaster prevention system. As shown in Figure 1, an inbound tunnel 1a and an outbound tunnel 1b have been constructed as tunnels for a motorway.

[0034] Inside the up-track tunnel 1a and the down-track 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.

[0035] The fire detector 12 has two sets of fire detection units, so that it has detection areas in both the upward and downward directions along the longitudinal direction of the tunnel, 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 that has occurred within the detection area.

[0036] 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 body and ducts from fires are also installed in the up-track tunnel 1a and down-track tunnel 1b, but these are not shown in the illustration.

[0037] Transmission lines 14a and 14b, including power lines, are drawn from the disaster prevention receiving panel 10 to the up-line tunnel 1a and the down-line tunnel 1b, and fire detectors 12 are connected to them, and a unique address is set for each line of the fire detectors 12.

[0038] In addition, the disaster prevention receiving panel 10 is provided with a fire pump system 16, duct cooling pump system 18, IG slave station system 20, ventilation system 22, alarm display board system 24, radio rebroadcast system 26, television monitoring system 28, and lighting system 30, and except for the IG slave station system 20, which is connected via a data transmission line, the other systems are individually connected to the disaster prevention receiving panel 10 via P-type signal lines. Here, the IG slave station system 20 is a communication system that connects the disaster prevention receiving panel 10 with remote monitoring and control system 32, an external higher-level system, via a network.

[0039] The ventilation equipment 22 is a facility that applies energy to the air inside the tunnel by operating jet fans installed on the ceiling side of the tunnel to blow out air at high speeds, thereby creating a ventilation flow in the longitudinal direction of the tunnel.

[0040] The warning display board equipment 24 is equipment that notifies tunnel users of any abnormalities inside the tunnel by displaying them on an electronic display board. The radio rebroadcast equipment 26 is equipment that allows drivers and others inside the tunnel to receive information from the road administrator. The television monitoring equipment 28 is equipment that confirms the scale and location of a fire, activates water spray equipment, and grasps the situation inside the tunnel when providing evacuation guidance. The lighting equipment 30 is equipment that drives and manages the lighting equipment inside the tunnel.

[0041] [Disaster prevention receiving panel] (Outline of disaster prevention receiving panel) Figure 2 is a block diagram showing an outline of the functional configuration of the disaster prevention receiving panel. As shown in Figure 2, the disaster prevention receiving panel 10 is equipped with a panel control unit 34. The panel control unit 34 has functions that are realized, for example, by executing a program, and uses, as hardware, a computer circuit equipped with a CPU, memory, various input / output ports, etc.

[0042] Transmission units 36a and 36b are provided for the panel control unit 34, and multiple fire detectors 12 installed in the up-line tunnel 1a and the down-line tunnel 1b are connected to transmission lines 14a and 14b drawn from the transmission units 36a and 36b, respectively.

[0043] The panel control unit 34 is also provided with an alarm unit 38 equipped with a speaker, alarm indicator lights, etc., a display unit 40 equipped with an LCD display, printer, etc., an operation unit 42 equipped with various switches, etc., and a modem 44 connecting the IG slave station equipment 20 which communicates with external monitoring equipment.Furthermore, an IO unit 46 is provided to which the fire pump equipment 16, cooling pump equipment 18, ventilation equipment 22, alarm display board equipment 24, radio rebroadcasting equipment 26, television monitoring equipment 28 and lighting equipment 30 shown in Figure 1 are connected.

[0044] The panel control unit 34 instructs the transmission units 36a and 36b to repeatedly send call signals including polling commands that sequentially specify the addresses of the fire detectors 12, and when the fire detectors 12 receive a call signal that matches their own address, they send back a response signal including information about their own status, such as fire detection, test results, temperature, humidity, etc.

[0045] 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 outputs a fire alarm using the alarm unit 38 and also controls the IO unit 46 to instruct the linked control of other equipment.

[0046] 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 that sequentially specifies the addresses of the fire detectors 12, causing the fire detectors 12 to perform sensitivity tests, contamination tests, and deterioration tests and respond with the results of each test. Also, by performing a test operation that specifies the address of a specific fire detector 12 using the operation unit 42, it is possible to transmit a test signal to an individual fire detector to perform the test.

[0047] In addition, when the panel control unit 34 receives a response signal indicating a sensor failure obtained by a sensitivity test of the fire detector 12, it controls the alarm unit 38 to issue an alarm indicating a sensor failure alarm specifying the address of the fire detector, by sounding an alarm, by displaying an alarm on the display unit 40, and by printing an alarm.

[0048] In addition, when the panel control unit 34 receives a response signal indicating abnormal contamination obtained by a sensitivity test of the fire detector 12, it controls the alarm unit 38 to issue an alarm sound, the display unit 40 to display a message on the display, and the display unit 40 to print out a contamination alarm specifying the address of the fire detector.

[0049] In addition, when the panel control unit 34 receives a response signal indicating a failure or abnormality obtained through the sensitivity test and contamination 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 slave station equipment 20 shown in Figure 1, and controls the issuance of a failure alarm or abnormality alarm.

[0050] Furthermore, the panel control unit 34 controls the changing of the threshold values ​​set in the fire detectors 12 for determining sensitivity abnormalities and contamination abnormalities, based on the operation of the operation unit 42 using the display of the display unit 40. This control for changing 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.

[0051] In the following description, the transmission paths 14a and 14b and the transmission units 36a and 36b may be referred to as the transmission path 14 and the transmission unit 36 ​​when there is no need to distinguish between them.

[0052] (Deterioration determination section of disaster prevention receiving panel) The panel control unit 34 of the disaster prevention receiving panel 10 is provided with a deterioration determination unit 48 function that determines the degree of deterioration of the fire detectors 12 installed in the tunnel and notifies the user. The deterioration determination unit 48 of this embodiment determines the degree of deterioration based on the environmental stress of the fire detectors 12 and the period of use.

[0053] 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 if the measured temperature or its change exceeds a predetermined value, it increments the temperature deterioration count value P1, which indicates the degree of deterioration due to temperature, by one, and if the measured humidity or its change exceeds a predetermined value, it increments the humidity deterioration count value P2, which indicates the degree of deterioration due to humidity, by one.

[0054] In this embodiment, the temperature degradation count P1 and humidity degradation count P2 are determined on the fire detector 12 side and sent to the disaster prevention receiving panel 10. For this purpose, the panel control unit 34 instructs the transmission units 36a, 36b at predetermined intervals to transmit measurement instruction signals sequentially specifying the addresses of the fire detectors 12, and when a fire detector 12 receives a measurement instruction signal that matches its own address, it sets the currently determined temperature degradation count P1 and humidity degradation count P2 in a response signal as environmental stress measurement information and transmits it, and the panel control unit 34 receives the response signal to obtain the temperature degradation count value P1 and humidity degradation count value P2.

[0055] The deterioration determination unit 48 also generates an aging deterioration count value P3 that indicates aging deterioration corresponding to the usage period of the fire detector 12. The aging deterioration count value P3 is predetermined as a value that increases in units of years, for example, with the service life of the fire detector 12 being the maximum usage period.

[0056] Figure 3 is a time chart showing the changes over time in the temperature deterioration count value P1, humidity deterioration count value P2, aging deterioration count value P3, and total deterioration count value P used in deterioration determination. For ease of explanation, the chart shows a linear increase in the number of years on the horizontal axis.

[0057] The deterioration determination unit 48 calculates the total deterioration count value P by adding the temperature deterioration count value P1, the humidity deterioration count value P2, and the aging deterioration count value P3, 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 an alarm, the display unit 40 to display a display, and the display to print out a deterioration alarm that identifies the address of the fire detector 12.

[0058] 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, and the display of information on the need for inspection, confirmation, or investigation, specifying the address of the fire detector 12 that has been determined to be deteriorated, and to notify the information by printing.

[0059] The deterioration threshold value Pth may be set to two levels, for example, Pth1 and Pth2. In this case, when the deterioration count value sum P reaches the first-level deterioration threshold value Pth1, the deterioration determination unit 48 controls the alarm unit 38 to sound an alarm, the display unit 40 to display a display, and the display unit 40 to print a deterioration warning that identifies the address of the fire detector 12, as an indication of the deterioration state.

[0060] In addition, when the total degradation count value P reaches a second-stage degradation threshold Pth2 that is higher than the first-stage degradation threshold Pth2, the degradation determination unit 48 controls the display unit 40 to issue a degradation alarm that identifies the address of the fire detector 12 by sounding an alarm, displaying it on a display, or printing it out to notify the user of the degradation situation.

[0061] Furthermore, the deterioration determination unit 48 performs the deterioration determination based on the deterioration count value sum P, as well as the temperature deterioration count value P1, humidity deterioration count value P2, and aging deterioration count value P3.

[0062] 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 (P1)th, and controls the alarm unit 38 to issue an alarm of temperature deterioration specifying the address of the fire detector 12, by sounding an alarm, by displaying an alarm on the display unit 40, or by printing.

[0063] In addition, the deterioration determination unit 48 determines that deterioration has occurred due to humidity stress when the humidity deterioration count value P2 reaches a predetermined humidity deterioration threshold (P2)th, and controls the alarm unit 38 to issue an alarm sound, a display unit 40 to display a message on the display unit 40, or a printout to identify the address of the fire detector 12 and issue a humidity deterioration alarm.

[0064] Furthermore, the deterioration determination unit 48 determines that deterioration has occurred when the deterioration count value P2 reaches a predetermined deterioration threshold (P3)th, and controls the alarm unit 38 to issue an aging deterioration alarm specifying the address of the fire detector 12, by sounding an alarm, displaying on the display unit 40, or printing.

[0065] By issuing a deterioration alarm corresponding to the deterioration factor in this way, it is possible to determine whether the main cause of deterioration is temperature stress, humidity stress, or aging, and to take measures to eliminate the deterioration factor for a fire detector 12 that has been determined to be deteriorated, thereby slowing down the progression of deterioration over time.

[0066] It is also possible to set a two-stage threshold for the deterioration determination for each of the temperature deterioration count value P1, humidity deterioration count value P2, and aging deterioration count value P3, and issue a deterioration warning when a deterioration determination is made based on a first-stage threshold, and issue a deterioration alarm when a deterioration determination is made based on a second-stage threshold that is higher than the first-stage threshold. Also, a representative notification may be issued for each of the deterioration warnings or deterioration alarms based on the temperature deterioration count value P1, humidity deterioration count value P2, and aging deterioration count value P3.

[0067] Furthermore, when the panel control unit 34 receives a response signal indicating a sensor failure obtained by a sensitivity test of the fire detector 12, the deterioration determination unit 48 performs control to update the deterioration threshold based on the deterioration count value of the fire detector 12 for which a sensor failure has been determined. This is because when the system starts operating, the deterioration threshold is a value determined at the design stage and may not necessarily match the deterioration status of the system in actual operation, and the deterioration count value of the fire detector 12 for which a sensor failure has been determined can be used as a guideline for the threshold for deterioration determination.

[0068] Taking the deterioration count value sum P as an example, if the initially set deterioration threshold 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 the deterioration threshold Pth is updated based on this to a lower value, for example, Pth=7000. This improves the function of determining and notifying deterioration of fire detectors 12 other than the fire detector with a sensor failure before a sensor failure occurs.

[0069] Furthermore, when the panel control unit 34 determines that a fire detector 12 has not issued a fire alarm, the deterioration determination unit 48 similarly controls to update the deterioration threshold value based on the deterioration count value of the fire detector 12 that has not issued a fire alarm. Here, the deterioration determination unit 48 aims to determine and issue a deterioration alert before a 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 not issued a fire alarm, the function of determining and issuing a deterioration alert before a non-fire alarm is issued for other fire detectors 12 can be improved.

[0070] The deterioration threshold value in the deterioration determination unit 48 may be updated in response to an instruction for updating from the operation unit 42 in the event of a sensor failure or a non-fire alarm, or may be updated automatically.

[0071] [Fire detector] (Appearance of a fire detector) FIG. 4 is an explanatory diagram showing the appearance of the fire detector, and FIG. 5 is a block diagram showing an outline of the functional configuration of the fire detector.

[0072] 4, the fire detector 12 has two pairs of light-transmitting windows 50R, 50L, separated into left and right, in a sensor housing 51 provided in the upper part of the housing 49, and a sensor unit 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, which house external test light sources used for soiling tests of the light-transmitting windows 50R, 50L, are provided near the light-transmitting windows 50R, 50L in positions where the sensor units can be seen through.

[0073] 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.

[0074] (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 drive unit 72, internal test light sources 74R, 75R and internal test light sources 74L, 75L used for sensitivity tests, and external test light sources 76R, 76L used for 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.

[0075] The detector control unit 54 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, and the like.

[0076] 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 serial transmission common line SC of the transmission path 14, and various signals are transmitted and received by serial transmission.

[0077] 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 and 60L on the left and right, and the test light emission drive unit 72.

[0078] 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.

[0079] (Fire detection section) The fire detection units 60R, 60L include sensor units 64, 68 and amplification processing units 66, 70. Taking the right fire detection unit 60R as an example, a right light-transmitting window 50R provided in the detector cover is disposed in front of the sensor units 64, 68, and light energy from the external detection area is incident on the sensor units 64, 68 through the right light-transmitting window 50R.

[0080] 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 CO2 resonance radiation band specific to fires, from the light energy incident through the right-eye translucent window 50R using an optical wavelength bandpass filter, detects the energy of the radiation using a light-receiving sensor, performs photoelectric conversion, and then performs predetermined processing such as amplification using an amplifier processing unit 66 to generate a light-receiving signal corresponding to the amount of energy, and outputs it to the detector control unit 54.

[0081] The sensor unit 68 selectively transmits (passes) radiation energy of 5 to 6 μm from the light energy incident through the left eye translucent 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 an amplification processing unit 70 to convert it into a light receiving signal corresponding to the amount of energy and outputs it to the detector control unit 54.

[0082] The amplification processing units 66 and 70 are provided with a preamplifier, a filter that passes the flame fluctuation frequency band, a power amplifier, and the like.

[0083] (Fire judgment) The detector control unit 54 is provided with the function of a fire determination unit 80, which is a function realized by executing a program. The fire determination unit 80 determines the presence or absence of a flame by, for example, taking the 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, and when it determines that a fire is present, 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 transmits the response signal to the disaster prevention receiving panel 10.

[0084] (Sensitivity test) The detector control unit 54 is provided with the function of a sensitivity test unit 82, which is 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 drive 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.

[0085] For example, in a sensitivity test of the circuit system of the sensor unit 64 and 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, which is specific to a flame and received by the sensor unit 64, and 5 to 6 μm, which is received by the sensor unit 68, and is light having a fluctuation frequency of 8 to 12 Hz, which is specific to a flame.

[0086] The sensitivity test section 82 performs a sensitivity test for each circuit block of the sensor section 64 and the amplification processing section 66, and for each circuit block of the sensor section 68 and the amplification processing section .

[0087] 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 operating period passes, the detected light reception value gradually decreases, and the detection sensitivity decreases to 0.9, 0.8, 0.7, and so on.

[0088] In this way, when the detection sensitivity drops to 1 or less, the sensitivity test unit 82 determines the detection sensitivity through a sensitivity test, and also determines a correction value which is the reciprocal of the detection sensitivity and stores it in memory. The light reception value detected in the subsequent operating state 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.

[0089] 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 if 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 abnormal 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 that matches 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 a sensor failure if it determines multiple consecutive times that the failure is due to abnormal sensitivity.

[0090] A sensitivity test of the circuit system of the sensor section 68 and the amplification processing section 70 in the left eye 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.

[0091] (Stain test) The detector control unit 54 has the function of a dirt test unit 84, which is 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 drive unit 72 to sequentially drive the external test light sources 76R, 76L to emit light and perform a dirt test on the light-transmitting windows 50R, 50L.

[0092] For example, in the case of a stain test on the light-transmitting window 50R, the test light emission drive 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, which is specific to flames and received by the sensor unit 64, and 5 to 6 μm, which is received by the sensor unit 68, and is light having a fluctuation frequency of 8 to 12 Hz, which is specific to flames.

[0093] 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.

[0094] 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 result by the reference light reception value is 0. As the operation period passes, dirt accumulates on the translucent window 50R, and the light attenuation rate gradually increases to 0.1, 0.2, 0.3, and so on.

[0095] When the light attenuation rate increases in this way, the dirt test unit 84 determines the light attenuation rate through a dirt test, and also determines a correction value which is the reciprocal of (1 - light attenuation rate) and stores this in memory.The light reception value detected in the subsequent operational state (the light reception value corrected by the correction value from the sensitivity test) is divided by the correction value to perform a dirt correction, and the fire judgment unit 80 judges a fire based on the dirt-corrected light reception value.The light reception value detected in the operational state is corrected by the correction value obtained in the sensitivity test and the correction value obtained in the dirt test.

[0096] In addition, the dirt testing unit 84 is preset with a dirt threshold value, for example, a dirt threshold value of 0.5, which is the light attenuation rate corresponding to the limit at which dirt correction becomes impossible, and if the light attenuation rate obtained in the sensitivity test is equal to or exceeds the dirt threshold value, 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.

[0097] (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 in response to this, a temperature sensor 88 and a humidity sensor 90 located within the fire detector 12 are connected to the detector control unit 54.

[0098] The environmental stress measurement 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 controls the storage of the measured temperature T and measured humidity H in memory.

[0099] 6 is a time chart showing the change in the temperature deterioration count value in response to the daily change in the measured temperature. After storing the measured temperature T in memory, the environmental stress measurement unit 86 compares the measured temperature T with a predetermined temperature threshold Tth, and if the measured temperature T exceeds the predetermined temperature threshold Tth, it performs control to increase the temperature deterioration count value P1, for example, by 1.

[0100] The same applies to 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.

[0101] 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 humidity deterioration count value P2 as environmental stress measurement information in the response signal to the measurement instruction signal and control it to send it to the disaster prevention receiving panel 10.

[0102] In another embodiment of the environmental stress measurement unit 86, the unit measures and stores the measured temperature for a predetermined period of time, for example, one day's worth of temperature in predetermined time units in memory, and when it receives a measurement instruction signal specifying its own address from the disaster prevention receiving panel 10 via the transmission unit 56, it calculates the temperature change ΔT from the maximum and minimum values ​​of the measured temperature for that day, and if the temperature change ΔT exceeds a predetermined temperature threshold ΔTth, it increments the temperature degradation count value P1 by one, and also calculates the humidity change ΔH from the maximum and minimum values ​​of the measured humidity for that day, and if the temperature change ΔH exceeds a predetermined temperature threshold ΔHth, it increments the temperature degradation count value P2 by one, and instructs the transmission unit 56 to set the temperature degradation count value P1 and humidity degradation count value P2 as environmental stress measurement information in a response signal to the measurement instruction signal and transmit it to the disaster prevention receiving panel 10.

[0103] [Deterioration detection operation by disaster prevention monitoring system] Figure 7 is a flowchart showing the control operation of the deterioration determination unit provided in the disaster prevention control panel, and Figure 8 is a flowchart showing the control operation of the deterioration determination unit following Figure 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 Figure 2.

[0104] As shown in Figure 7, when the power to 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 it is time to perform deterioration determination, for example, once a day.

[0105] Once the timing for determining deterioration is 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 addresses sequentially specified to the transmission paths 14a, 14b, and acquires the temperature deterioration count value P1 and the humidity deterioration count value P2 by receiving response signals transmitted from the fire detector 12 with matching addresses.

[0106] 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 temperature deterioration.

[0107] Next, the deterioration determination unit 48 compares the humidity deterioration count value P2 obtained 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 humidity deterioration.

[0108] 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.

[0109] Next, in step S10, the deterioration determination unit 48 obtains the total deterioration count value P including the temperature deterioration count value P1, humidity deterioration count value P2, and aging deterioration count value P3, compares it with the deterioration threshold value (P)th, and if it determines that the total deterioration count value P exceeds the deterioration threshold value (P)th, it proceeds to step S11 and determines deterioration.

[0110] Next, the process proceeds to step S12 in Figure 8, where the deterioration determination unit 48 determines whether or not a deterioration determination has been made through the processing of steps S4 to S11.If it determines that a deterioration determination has not been made, the process proceeds to step S14.If it is not the final address, the process proceeds to step S15, where address A is incremented by one, and the process returns to step S3 in Figure 7, and the process from step S3 is repeated for the next fire detector 12.

[0111] 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.

[0112] Also, 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.

[0113] Also, 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 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 Figure 7 to wait for the next timing for deterioration determination.

[0114] [Modifications of the present invention] (environmental stress) In the above embodiment, the deterioration determination unit 48 measures temperature and humidity as environmental stresses and calculates the respective deterioration count values ​​to determine deterioration, but this is not limited to this, and shock vibrations and electrical noise may also be measured as environmental stresses.

[0115] Impact vibrations are measured by a vibration sensor, for example, and the impact deterioration count value P4 is increased when the detected vibrations exceed a predetermined threshold. Impact vibrations that increase the impact deterioration count value P4 include vibrations caused by a vehicle colliding with a tunnel sidewall or the like in a vehicle accident and impact vibrations caused by a large-scale earthquake, and are expected to impose large mechanical stresses on the fire detector 12.

[0116] Furthermore, electrical noise is detected by, for example, a voltage sensor or a current sensor as an external surge applied to the fire detector, and increases the electrical noise degradation count value P5. Electrical noise that increases the electrical noise degradation count value P5 includes, for example, an induced surge caused by a lightning strike, which is expected to impose a large mechanical stress on the fire detector 12.

[0117] The voltage sensor and current sensor that measure electrical noise are installed inside the fire detector 12, but 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 can be connected to a transmission path from the disaster prevention receiving panel 10, and the measurement results of the impact vibration from the vibration sensor are sent to the disaster prevention receiving panel 10 to determine deterioration.

[0118] 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 the total deterioration count value P exceeds a predetermined deterioration threshold value Pth set in advance, deterioration is determined and an alert is issued.

[0119] The deterioration determination unit 48 also sets a predetermined deterioration threshold for each of the impact deterioration count value P4 and the electrical noise deterioration count value P5, and when the threshold is exceeded, issues a warning indicating the deterioration indicating the impact deterioration or the electrical noise deterioration.

[0120] (Increase in degradation count value) 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 amount of change 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 suffered by the fire detector 12 due to environmental stress. For example, since the degree of deterioration due to humidity stress is greater than that due to temperature stress, the temperature is increased by one count, while the humidity is increased by a predetermined number of two or more counts.

[0121] The same applies to the impact deterioration count value P4 and electrical noise deterioration count value P5 mentioned above. Since the degree of deterioration due to impact and surge is high, the increase in the specified count number is even greater than in the case of humidity.

[0122] (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 the temperature and humidity measurement results are used by the environmental stress measurement unit of the fire detector 12 to determine temperature deterioration count values ​​and humidity deterioration count values, which are then 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 may be sent from the fire detector 12 to the deterioration determination unit 48 of the disaster prevention receiving panel 10, and the temperature deterioration count values ​​and humidity deterioration count values ​​may be determined by the deterioration determination unit 48.

[0123] Furthermore, 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 the tunnel outside the fire detector 12, and the environmental temperature and humidity inside the tunnel where the fire detector 12 is installed may be measured by the disaster prevention receiving panel 10 to determine deterioration. In this case, since the temperature sensor can be an existing temperature sensor provided in the internal circuit of the fire detector 12, it is preferable to provide a humidity sensor not in the fire detector 12 but in the tunnel outside the fire detector 12.

[0124] Furthermore, when installing humidity sensors inside a tunnel, the tunnel can be divided into sections with a predetermined number of fire detectors, and a humidity sensor can be installed in each section, thereby reducing the number of humidity sensors relative to the number of fire detectors. This type of sensor installation per section also applies to the vibration sensors mentioned above.

[0125] (Displays a list of deterioration status) Furthermore, the deterioration determination unit 48 of the disaster prevention receiving panel 10 may be configured to 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 having the disaster prevention receiving panel 10 display a list of the deterioration status of a specific fire detector 12 or all fire detectors 12, etc., when a deterioration abnormality is reported or a non-fire alarm is issued, etc., as necessary.

[0126] (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 a person in charge, etc., to check the progress of deterioration, the cause of non-fire, etc. by having the disaster prevention receiving panel display a list of environmental stresses for a specific fire detector or all fire detectors, etc., when a deterioration abnormality is reported or a non-fire alarm is issued, etc., as necessary.

[0127] (List by type of environmental stress) Furthermore, the deterioration determination unit 48 of the disaster prevention receiving panel 10 may be configured to sort multiple types of environmental stress into categories based on a predetermined operation instruction from the operation unit 42 and display a list on the display of the display unit 40 .

[0128] This allows personnel in charge, etc., to check the progress of deterioration and whether the main cause of non-fires is environmental stress by displaying the temperature, humidity, shock vibration, electrical noise, etc. of a specific fire detector or all fire detectors on the disaster prevention receiving panel, and take necessary measures when abnormal deterioration is reported or a non-fire alarm is issued.

[0129] (Manual change of deterioration judgment threshold) Furthermore, 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 also change the deterioration threshold based on a specified operation instruction from the operation unit 42.

[0130] This allows the person in charge to, for example, change the deterioration threshold to a higher value if a deterioration abnormality is reported but there are no non-fire alarms at all, thereby preventing frequent occurrence of deterioration abnormalities, or, on the other hand, change the deterioration threshold to a lower value if there are frequent non-fire alarms without any deterioration abnormalities being reported, so that a deterioration abnormality is reported before a non-fire alarm is issued.

[0131] (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.

[0132] This allows personnel to, if necessary, check the deterioration status or causes of non-fires by displaying the operation history of a specific fire detector 12 or all fire detectors 12 on the disaster prevention receiving panel 10 when an abnormal deterioration of the fire detector 12 is reported or when a non-fire alarm is issued.

[0133] (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 and 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.

[0134] This allows personnel in charge, if necessary, to check the deterioration status or the cause of the non-fire by displaying the zero-point history of a specific fire detector or all fire detectors on the disaster prevention receiving panel when a deterioration abnormality is reported or a non-fire alarm is issued.

[0135] (Fire detector) Although a two-wavelength fire detector has been used as an example, other methods are also possible. For example, in addition to the two wavelengths mentioned above, a three-wavelength flame detector may be used that 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 band, which is the 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.

[0136] (P-type tunnel disaster prevention system) The above embodiment shows a so-called R-type tunnel disaster prevention system that monitors fires by connecting a fire detector with an address set to a transmission line drawn from a disaster prevention receiving panel, but the present invention is not limited to this and is also applicable to a so-called P-type tunnel disaster prevention system in which a signal line is drawn from the disaster prevention receiving panel for each fire detector and a fire detector is connected to each signal line.

[0137] 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 the deterioration determination unit of the fire detector determines deterioration, for example, the signal line is disconnected, thereby transmitting a deterioration determination signal to the disaster prevention receiving panel to notify of the deterioration.

[0138] (others) The present invention also includes appropriate modifications that do not impair the objects and advantages thereof, and is not limited to the numerical values ​​shown in the above embodiments. [Explanation of symbols]

[0139] 1a: Up line tunnel 1b: Down line tunnel 10: Disaster prevention receiving panel 12: Fire detector 14a, 14b: Transmission path 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 monitoring 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: Translucent 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 Section 88: Temperature sensor 90: Humidity sensor

Claims

1. a detector control unit having a function of increasing a deterioration count value each time the measured environmental stress satisfies a predetermined condition; a transmitter for transmitting a signal including the deterioration count value; Equipped with As the environmental stress, at least one of vibration and electrical noise applied to the device itself is measured; The vibrations that are applied to the vehicle itself include collision vibrations caused by vehicle accidents and shock vibrations caused by large-scale earthquakes. A fire detector characterized in that the electrical noise applied to the detector includes an external surge applied to the detector, such as an induction surge caused by a lightning strike.

2. The fire detector of claim 1; a deterioration determination unit that receives a signal including the deterioration count value transmitted from the transmission unit of the fire detector and determines a degree of deterioration of the fire detector based on the deterioration count value included in the signal; A disaster prevention system comprising:

3. The disaster prevention system according to claim 2, The deterioration determination unit is provided in a disaster prevention receiving panel connected to the fire detector by a signal line, A disaster prevention system characterized in that a signal including the deterioration count value from the transmission unit of the fire detector is transmitted to the deterioration determination unit via the signal line.

Images