Fire monitoring system

Abstract

To provide a fire monitoring system reliably preventing forgetting to remove a cover member attached to a fire sensor without additionally changing a structure and a function of the fire sensor.SOLUTION: In a fire monitoring system, a sensor management unit 48 of a receiver 10 receives a smoke density detected by an analog smoke detector 14 during construction work and compares it with a predetermined threshold value of the smoke density close to zero but not zero. When the smoke density is less than a predetermined threshold value, it is determined that a dustproof cover 15 to be a cover member is not removed. When the smoke density is equal to or larger than the threshold value, it is determined that the dustproof cover 15 is detached, and the determination results is displayed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fire monitoring system that monitors fires using fire detectors. [Background technology]

[0002] In a conventional R-type (Record-type) fire monitoring system, a fire detector with a transmission function and a unique address, such as a smoke detector, is connected to a receiver. The receiver receives the detection results based on the smoke density detected by the smoke detector, and when the detection results meet the specified fire detection conditions, it determines that a fire has occurred and outputs a fire alarm by sound and display indicating the location of the fire.

[0003] During the construction work for such a fire monitoring system, the receiver is switched to construction and maintenance mode (a mode that stops audible fire alarms and linked controls), and then work is carried out to connect terminals such as smoke detectors and smoke control equipment, which have unique addresses set up, to the receiver.Tests are then conducted on the connected terminals to confirm their operation, and construction is carried out in preparation for the final fire inspection.

[0004] Smoke detector installation involves installing a detector base on the ceiling of a room, which will be the area to be monitored, and connecting it to a receiver. The smoke detector is then fitted into the detector base for mechanical and electrical connections. The smoke detector irradiates smoke that has entered the smoke detector's internal section with a detection light, and detects the smoke concentration by receiving the scattered light. Furthermore, smoke detectors are fitted with dust covers as cover members when shipped from the factory. During installation, the dust covers are left attached to prevent dust from entering, and are removed before the final fire inspection. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-026259 Summary of the Invention [Problem to be solved by the invention]

[0006] However, confirming that the dust covers have been removed from the smoke detectors requires a visual inspection by construction personnel who visit the site. Smoke detectors are installed in various locations on each floor, such as rooms, corridors, and staircases, which are areas of surveillance, so confirming that the dust covers have been removed takes time and effort. In the unlikely event that a smoke detector with its dust cover remaining unremoved is found, the fire monitoring function for that location will be lost.

[0007] To solve this problem, for example, in residential fire alarms, as shown in Patent Document 1, a cover detection switch is provided to detect whether the dust cover has been removed, and an alarm is issued if the dust cover has been left unremoved.

[0008] However, installing cover detection switches and other devices that are not necessary for actual operation on the numerous smoke detectors installed in a fire monitoring system increases the complexity of the structure and leads to increased costs. Similar problems also exist with residential fire alarms.

[0009] The present invention aims to provide a fire monitoring system that can reliably prevent the cover member attached to a fire detector from being forgotten to be removed, without making any additional changes to the structure or function of the fire detector. [Means for solving the problem]

[0010] (Fire monitoring system using only fire detectors) The present invention is a fire monitoring system equipped with a fire detector that detects a detection target in a monitoring area, and is characterized by having a judgment unit that judges whether a cover member for the fire detector has been removed based on whether a predetermined physical quantity detected by the fire detector to determine a fire satisfies a condition that is different from the condition for determining a fire.

[0011] (Once the detection results meet the specified conditions, it is determined that the device has been removed.) After determining that the cover member has been removed, the determination unit determines that the cover member has not been removed when conditions are met, including the most recent detection value of a specified physical quantity or its moving average value being less than or equal to a specified threshold value.

[0012] (Fire monitoring system with fire detectors and receivers) The fire monitoring system also includes a receiver connected to multiple fire detectors, The receiver includes a determination unit.

[0013] (Indication of cover removal status) The receiver displays the removal status of the cover members of a plurality of fire detectors on the same screen.

[0014] (Selective display of cover removal status) The receiver is A predetermined fire detector can be selected from a plurality of fire detectors, The removal status of the cover member of the selected fire detector is displayed, and the removal status of the cover member of the non-selected fire detector is not displayed.

[0015] (Fire detection and determination of cover removal status) If the receiver detects a fire during the fire detector test, it determines that the cover member has been removed from the fire detector.

[0016] (Remote testing from the receiver and determining whether the cover is removed) The receiver has a remote test function that electrically causes the fire detector to perform the operation when a fire is detected, and if the fire detector detects a fire based on the remote test function, it does not determine that the cover member has been removed. [Effects of the Invention]

[0017] (Effectiveness of a fire monitoring system using only fire detectors) According to the present invention, based on the knowledge that when a cover member attached to a fire detector is removed, the detection results fluctuate based on external disturbances to the object of detection, the removal status of the cover member attached to the fire detector is determined based on the detection value of a predetermined physical quantity that is detected to detect a fire.This makes it possible to simply and easily check the removal status of the cover member on the fire detector without making any additional changes to the physical structure or function of the fire detector, and reliably prevents the cover member from being forgotten to be removed.

[0018] (The effect is that once the detection results meet certain conditions, it is determined that the device has been removed.) Furthermore, if the detection result satisfies a predetermined condition, it is determined that the cover member has been removed from the time when the predetermined condition is met onward. This makes it possible to determine that the cover member has been removed even when the disturbance to the object to be detected fluctuates and the detection result no longer satisfies the predetermined condition, thereby making it possible to stably prevent the cover member from being removed.

[0019] (Effectiveness of a fire monitoring system equipped with fire detectors and receivers) Furthermore, when a fire monitoring system is equipped with a receiver to which multiple fire detectors are connected, the detector management section of the receiver determines the removal status of the cover members of the fire detectors based on the detection results received from each of the fire detectors. Therefore, when installing the fire monitoring system, the removal status of the cover members can be easily and simply confirmed on the receiver side without having to go to the site, thereby ensuring that the cover members are not forgotten to be removed.

[0020] (Effect of displaying the cover removal status) In addition, by displaying the removal status of multiple cover members on the same screen, the receiver can easily and conveniently check the removal status of the cover members of multiple fire detectors for which installation has been completed on the receiver side, for example, by displaying a list of these items during installation work on the fire monitoring system.

[0021] (Effect of selectively displaying the cover removal status) Furthermore, the receiver can select a fire detector based on predetermined conditions, and displays the removal status of the cover member of the selected fire detector, but does not display the removal status of the cover member of fire detectors that are not selected. Therefore, by selecting a fire detector as needed, for example, by system, address or address range for each system, which is a signal line unit from the receiver, the removal status of the cover member can be easily and reliably known by installation location, for example, by floor, area, room, etc.

[0022] (Effectiveness of detecting fire and determining whether cover material is removed) In addition, if the fire detector detects a fire, the receiver determines that the cover member of the fire detector has been removed.This is because, during installation work for fire detectors that detect smoke, a roasting test (actual test) is conducted in which actual smoke or simulated smoke is introduced into the fire detector using a test jig to cause a test alarm to be sounded.Since it is essential to remove the cover member during the roasting test, if a fire is detected during the roasting test, the receiver determines that the cover member has been removed, making it possible to easily and reliably determine whether the cover member has been removed through the roasting test of the fire detector.

[0023] (Effect of remote testing from the receiver and determining whether the cover member is removed) In addition, the receiver has a remote testing function that causes the fire detector to perform the operation it would perform when it detects a fire, and if the fire detector detects a fire based on the remote testing function, it will not determine that the cover member has been removed.This is because the remote testing of the fire detector detects a fire by electrically testing the fire detector in response to instructions from the receiver, and does not require the removal of the cover member, so it is possible to reliably prevent the remote testing from mistakenly determining that the cover member has been removed due to fire detection. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is an explanatory diagram showing an embodiment of a fire monitoring system in which a receiver determines whether a dust cover is removed and notifies the user. [Figure 2] FIG. 2 is an explanatory diagram showing an example of construction management information stored in a receiver. [Figure 3] 1 is an explanatory diagram showing an embodiment of a smoke detector. [Figure 4] 4A and 4B are explanatory diagrams showing the attachment of a dust cover to a smoke detector, in which FIG. 4A shows the attachment of the dust cover and FIG. 4B shows the removal of the dust cover. [Figure 5] FIG. 10 is an explanatory diagram showing a construction management screen that displays the removal state of the dust cover using an address map. [Figure 6] FIG. 6 is an explanatory diagram showing the construction management screen following FIG. 5, where the construction work has progressed. [Figure 7] FIG. 10 is an explanatory diagram showing a construction management screen that displays the removal status of the dustproof cover in a list format. [Figure 8] FIG. 10 is an explanatory diagram illustrating a schematic diagram of a smoke detector roasting test performed with the dust cover removed. DETAILED DESCRIPTION OF THE INVENTION

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fire monitoring system according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments.

[0026] [Basic Concept of the Embodiment] First, the basic concept of the embodiment will be described. The embodiment generally relates to a fire monitoring system.

[0027] The fire monitoring system of this embodiment is equipped with a receiver to which multiple fire detectors are connected, and the receiver determines whether a fire has occurred based on the detection results detected by each of the fire detectors and issues an alarm.

[0028] Here, "fire detector" includes "smoke detectors" equipped with a smoke detection unit that detects smoke from a fire (generated in conjunction with a fire; the same applies below), "heat detectors" equipped with a heat detection unit that detects the heat of a fire, "flame detectors" equipped with an optical flame detection unit that detects infrared rays from a fire, "gas detectors" equipped with a gas detection unit that detects gas from a fire, and "combined detectors" that detect a combination of the above detection targets.

[0029] Furthermore, a "receiver" is a device that determines whether a fire has occurred and issues an alarm based on the detection results from multiple fire detectors, for example, multiple smoke detectors. For this reason, each smoke detector is assigned a unique address, and the receiver determines whether a fire has occurred and issues an alarm based on the detection results received from each smoke detector by specifying the address. The receiver determines whether a fire has occurred when the detection results meet a predetermined fire determination condition, for example, when the detection value remains above a predetermined fire threshold for a predetermined accumulation time, and outputs a fire alarm by sound and display. This concept includes R-type receivers that identify the installation location of smoke detectors and output a fire alarm.

[0030] The fire monitoring system of this embodiment is provided with a detector management unit that functions as a determination unit in the receiver. Here, the "detector management unit" determines the removal status of the cover member of the smoke detector based on the detection values ​​received from each fire detector, for example, the detection values ​​received from each smoke detector.

[0031] Furthermore, the "cover member" is a member that blocks or suppresses external disturbance inputs to the fire detector that are the object of detection, and may also block or suppress the object of detection. It may also have the function of protecting the fire detector body from external impacts, etc. The "cover member" may also be a member that blocks or suppresses all external disturbance inputs, or a member that blocks or suppresses only a portion of the external disturbance inputs.

[0032] Here, "input" includes, for example, the inflow of smoke or the like into a smoke detection unit, the radiation of heat into a heat detection unit, the incidence of light into an optical flame detection unit, the inflow of gas into a gas detection unit, etc. Also, "disturbance to be detected" includes, for example, smoke, dust, and water vapor when there is no fire in the case of a smoke detection unit, heat other than that from a fire in the case of a heat detection unit, light (radiation) other than that from a fire in the case of an optical flame detection unit, and gas other than that from a fire in the case of a gas detection unit.

[0033] The "cover member" is a detachable member for temporarily protecting the detection section of the fire detector, for example, during construction work, and is removed when the construction work is completed. For example, it is attached to the fire detector before shipping from the factory, and is left attached during construction work, and is removed before the construction work is completed.

[0034] Furthermore, the "detector management unit" determines whether the cover member of each smoke detector has been removed based on the detection results received from each smoke detector when the receiver is set to the installation and maintenance mode. Here, "determining whether the cover member has been removed" means determining whether "the cover member has not been removed" or "the cover member has been removed."

[0035] "Construction and maintenance mode" is an operating mode that is set in the receiver by a specified operation during construction of the fire monitoring system, and is a mode that suppresses (prohibits) audible fire alarms, interlocking control, and signal transfer control, etc., even if a fire is determined to be a fire based on the detection values ​​from fire detectors, including smoke detectors, and is a concept that includes inspection mode. On the other hand, after construction work is completed, "fire monitoring mode" is set by a specified operation, and audible fire alarms, interlocking control, signal transfer control, etc., which were suppressed in construction and maintenance mode, are released and enabled.

[0036] Furthermore, since when a cover member attached to a detector is removed, the detection value, which is the detection result based on the disturbance of the detection target, increases slightly after removal compared to before removal, the detector management unit sets a threshold value for determining the slight increase in detection value accompanying the removal of the cover member, and if the detection value is equal to or less than the threshold value, it determines that "the cover member has not been removed," and if the detection value is equal to or greater than the threshold value, it determines that "the cover member has been removed." This threshold value for determining whether the cover member has been removed is set as a predetermined value between a first detection value that is close to zero when the cover member is attached and a second detection value that is slightly higher than the first detection value when the cover member is removed.

[0037] Furthermore, if a fire is detected by a fire detector, the detector management unit determines that the cover member of the fire detector is removed. For example, if a fire is detected during a smoke detector test, the detector management unit determines that the cover member of the smoke detector is removed. For example, the detector management unit determines that the cover member attached to the smoke detector is removed based on test information received in conjunction with a smoke detector roasting test. Here, a "smoke detector roasting test" is a test in which simulated smoke is introduced into the smoke detector using a test jig, causing it to operate. If the test detection results received by the receiver satisfy the specified fire detection conditions and indicate a fire, the test is determined to be successful. Since the cover member is always removed when a smoke detector roasting test is performed, the detector management unit determines that the cover member is removed when it receives the specified test information associated with the roasting test.

[0038] On the other hand, the receiver is provided with a remote test function that causes the fire detector to perform the operation when it detects a fire, and if a fire is detected by the fire detector using this remote test function, the receiver will not determine that the cover member is removed, because the remote test of the fire detector does not require the removal of the cover member. For example, since the remote test of a smoke detector does not require the removal of the cover member, even if a fire is detected by the smoke detector based on the remote test function, the receiver will not determine that the cover member is removed.

[0039] In the specific embodiment shown below, the "receiver" is an "R-type receiver," the "fire detector" is an "analog smoke detector," the "cover member" is a "dustproof cover," the "cover member removal state" is the "dustproof cover removal state," and the "smoke detector test" is a "smoke detector roasting test."

[0040] [Specific details of the embodiment] The specific contents of the embodiment of the fire monitoring system will be described in more detail below. The contents will be explained separately as follows. a. Overview of the fire monitoring system b. Receiver b1. Receiver configuration b2. Construction terminal information b3. Fire monitoring control of receiver c. Analog smoke detectors d. Fire monitoring system installation work e. Check if the dust cover is removed f. Dust cover removal status indication f1. Displaying the dust cover removal status using the address map f2. Displaying the dust cover removal status in list format g. Determination of dust cover removal status based on smoke detector burning test h. Re-attaching the dust cover after the roasting test i. Residential fire alarm j. Modifications of the present invention

[0041] [a. Overview of the fire monitoring system] The fire monitoring system according to this embodiment comprises an R-type receiver 10 and a plurality of analog smoke detectors 14. As shown in Fig. 1, in a fire monitoring system in operation after construction work is completed, the receiver 10 is installed in a building's caretaker's room or the like, and signal lines 12 (12-1) to 12 (12-3), which also serve as power supply lines, are drawn from the receiver 10, separated into systems for each monitoring area. Here, the "monitoring area" refers to an area to be monitored, and is an outdoor or indoor space with a certain extent, and is a concept that includes areas such as rooms, corridors, and staircases of a building, and hereinafter the "monitoring area" will be referred to as a "room in a building."

[0042] A plurality of analog smoke detectors 14 with transmission functions and unique addresses are connected to the signal line 12 (12-1). The dustproof covers 15 that were attached to the analog smoke detectors 14 at the time of shipping from the factory remain in place, blocking the smoke inlet and preventing dust from entering the internal smoke detection unit. The dustproof covers 15 are removed before the installation work is completed.

[0043] In addition to a plurality of analog smoke detectors 14, an addressable transmitter 18 having a transmission function and a unique address is connected to the signal line 12 (12-2). Furthermore, smoke prevention and exhaust devices 24 such as fire doors and smoke exhaust devices are connected to the signal line 12 (12-3) via a repeater 16 having a transmission function and a unique address.

[0044] Here, the maximum number of addresses that can be set for terminal devices such as analog smoke detectors 14 and repeaters 16 connected to signal lines 12 (12-1) to 12 (12-3) is, for example, 255, and terminal devices including a maximum of 255 analog smoke detectors 14 can be connected.

[0045] [b. Receiver] (b1. Receiver configuration) The R-type receiver 10 determines whether there is a fire based on the detection results received from at least the analog smoke detector 14, and outputs a fire alarm specifying the location of the fire by sound and display, and its functions and configuration are arbitrary, but as an example, the receiver 10 is provided with a main CPU 26 and multiple sub-CPU boards 28 (28-1) to 28 (28-3), and each of the sub-CPU boards 28 (28-1) to 28 (28-3) is provided with a sub-CPU 30 and a transmission unit 32. The main CPU 26 and the sub-CPU 30 are connected by a serial transfer bus 34, and transmit and receive data to and from each other.

[0046] The main CPU 26 is connected to a display 36 with a touch panel using an LCD panel or the like, a display unit 38 equipped with representative lights for fire, gas leaks, and faults, LED indicator lights, etc., an operation unit 40 equipped with a switch for switching between construction and maintenance mode and fire monitoring mode and various switches necessary for fire monitoring, an acoustic alarm unit 42 equipped with a speaker, and a reporting unit 44.

[0047] The main CPU 26 is provided with a fire monitoring control unit 46 and a detector management unit 48 as functions realized by executing a program, and also stores construction terminal information 50 including the removal status of the dust cover 15 attached to the analog smoke detector 14.

[0048] (b2. Construction terminal information) 2 is an example of the construction terminal information 50 stored in the receiver 10. The construction terminal information 50 is divided into system, address, type, line (signal line), floor, display message, and status, and an area name such as "Theater 1F East" or "Theater 1F East-1" is stored as a display message that is an arbitrary number, followed by a "cover flag" that indicates whether the dust cover 15 has been removed, with the flag set to "0" when it is determined that "the dust cover has not been removed" and the flag set to "1" when it is determined that "the dust cover has been removed."

[0049] Addresses in the construction terminal information 50 that have blank fields after the type are unused addresses. Furthermore, the construction terminal information 50 stored in the main CPU 26 is used as is as terminal information for displaying fire areas and for interlocking control, once construction of the fire monitoring system is completed and the receiver 10 is switched to fire monitoring mode and the fire monitoring control unit 46 is functioning.

[0050] (b3. Fire monitoring control of receiver) After the installation of the fire monitoring system is completed and the receiver 10 is switched to the fire monitoring mode, the fire monitoring control during operation is as follows.

[0051] Taking the sub-CPU 30 and transmission unit 32 of the sub-CPU board 28 (28-1) as an example, fire monitoring control is performed by transmitting and receiving signals to and from the analog smoke detector 14 in accordance with a predetermined communication protocol. For example, downstream signals from the transmission unit 32 to the analog fire detector 14 are transmitted in voltage mode, and upstream signals from the analog fire detector 14 to the transmission unit 32 are transmitted in current mode.

[0052] As an example, the sub-CPU 30 instructs the transmitter 32 to transmit a broadcast batch AD conversion command signal at regular intervals (e.g., every minute), causing the analog smoke detector 14 to AD convert and store the detection value, which is the detection result based on the smoke density and disturbance input, as, for example, 8-bit data. Subsequently, the sub-CPU 30 transmits a call signal including a polling command that sequentially specifies the terminal addresses.

[0053] When the analog smoke detector 14 receives a call signal that matches its own address, it transmits a response signal including the detection value it is holding at that time. Also, when the detection value reaches a predetermined fire threshold, for example, a predetermined preliminary fire threshold (pre-alarm threshold) that is lower than the detection value when the smoke density is 10% / m, for example, the detection value when the smoke density is 3% / m, it transmits a fire interrupt signal.

[0054] Upon receiving the fire interrupt signal, the sub-CPU 30 transmits a group search command signal to identify the group including the analog smoke detector 14 that caused the fire interrupt, then transmits an intra-group search command signal to identify the address of the analog smoke detector 14 that caused the fire interrupt, and by repeatedly transmitting a batch AD conversion command signal and a call signal for the identified address, centrally collects the detection results of the analog smoke detector 14 that caused the fire interrupt and transmits them to the main CPU 26 via the serial transfer bus 34.

[0055] The fire monitoring control unit 46 of the main CPU 26 determines that a fire has occurred when the detection result received from the sub-CPU 30 satisfies predetermined fire determination conditions. For example, a fire is determined when a detection value exceeds a predetermined fire threshold, such as a detection value when the smoke density is 10% / m, for a predetermined cumulative time. If a fire is determined to have occurred, the fire representative light on the display unit 38 is turned on, a predetermined main acoustic alarm indicating the occurrence of a fire is output from the speaker of the acoustic alarm unit 42, fire alarm information indicating the location of the fire is displayed on the display 36, and a fire alarm signal is output externally by the alarm transmission unit 44 to perform predetermined alarm transmission control, etc.

[0056] [c. Analog smoke detector] The analog smoke detector 14 may have any configuration and function, but as shown in Figure 3, it may comprise a smoke detection unit 52, a detector control unit 54, a transmission unit 56, a power supply unit 58, a light-emitting driver 60, and a light-receiving amplifier 62. The smoke detection unit 52 has a known scattered-light smoke detection structure in which a light-emitting element 64 and a light-receiving element 66 are disposed in a smoke detection space into which smoke flows in from a smoke inlet but which blocks the incidence of light. The light-emitting element 64 is driven to emit light intermittently by the light-emitting driver 60, irradiating the smoke that has flowed into the smoke detection space. The light-receiving element 66 receives the light scattered by the smoke and outputs a smoke density detection signal corresponding to the smoke density. The light-receiving amplifier 62 amplifies the signal and outputs it to the detector control unit 54.

[0057] The detector control unit 54 is composed of a computer circuit equipped with a CPU, memory, and various input / output ports, and is realized by executing a program. Based on a batch AD conversion command signal received from the receiver 10 via the transmission unit 56, the detector control unit 54 AD-converts the smoke density detection signal from the light receiving amplifier unit 62 into a detection value, for example, 8-bit data, and reads it. The detector control unit 54 then transmits a response signal including the detected detection value in response to a subsequently received call signal specifying its own address. Furthermore, if the detected detection value is equal to or exceeds a predetermined preliminary fire threshold, for example, the detection value when the smoke density is 3% / m, the detector control unit 54 instructs the transmission unit 56 to transmit a fire interrupt signal. The detector control unit 54 also transmits a response signal indicating that a fire interrupt has been initiated in response to a group search command signal and an intra-group search command signal from the receiver 10.

[0058] [d. Fire monitoring system installation work] The construction work for the fire monitoring system shown in Figure 1 begins with installing an R-type receiver 10 in a caretaker's room or the like, then installing a detector base 20 on the ceiling 22 of the room to be monitored, as shown in Figure 4(A), and then wiring work is performed to connect the signal line from the receiver. Next, an analog smoke detector 14 with a dust cover 15 already attached is fitted into the detector base 20 using a known mating terminal structure, thereby connecting it electrically and mechanically.

[0059] Dust cover 15 is a cover member that, when attached to analog smoke detector 14, blocks smoke inlet 14a to prevent dust from entering the internal smoke detection unit, and while the shape and structure are arbitrary, for example, it is a substantially cylindrical member that opens toward detector base 20. If the ceiling surface 22 side is the upper part and the floor side is the lower part, annular recess 15a on the upper outer periphery (ceiling-side periphery) fits onto the outside of the detector, and annular base 15b on the lower outer periphery allows multiple analog smoke detectors 14 with dust covers 15 attached to be packed together at the factory when shipped. Dust cover 15 is made of a thin, transparent synthetic resin such as polyethylene.

[0060] Next, all terminals including the analog smoke detector 14 are tested to confirm that they are operating normally, and once all installation work is completed a fire inspection is conducted, and if this is passed, the receiver 10 is switched to fire monitoring mode to begin operation and enter fire monitoring control. As shown in Figure 4(B), the protective cover 15 must be removed from the analog smoke detector 14 before the installation work for the fire monitoring system is completed, and can be easily removed by, for example, pulling the dust cover 15 downward.

[0061] [e. Determining whether the dust cover is removed] When the detector management unit 48 of the receiver 10 is set to the construction and maintenance mode, it determines whether the dust cover 15 attached to the analog smoke detector 14 has been removed based on the detection results received from the analog smoke detector 14.The configuration and function are arbitrary, but for example, the initial value of the determination result may be that the dust cover 15 is "not removed," and if the detection value S received from the analog smoke detector 14 is equal to or exceeds the threshold value Sth, it may determine that the dust cover 15 has been "removed" from that point on.

[0062] Here, the threshold value Sth for determining whether the dust cover 15 has been removed is set as a predetermined value between the first detection value S1 detected when the dust cover 15 is attached to the analog smoke detector 14 and the smoke inlet is blocked, and the second detection value S2, which is slightly higher than the first detection value S1 detected when the dust cover 15 is removed and the smoke inlet is open.

[0063] For example, it is expected that the first detection value S1 when the dust cover 15 is attached will be approximately "0", and the second detection value S2 when the dust cover 15 is removed will be approximately "10", so the value of the threshold value Sth is set to "5".

[0064] The detection value S1, "0", corresponds to the value detected when the smoke density is "0% / m" when there is no disturbance input, the detection value S2, "10", corresponds to the value detected when the smoke density is "1% / m" when there is no disturbance input, and the threshold value Sth, "5", corresponds to the value detected when the smoke density is "0.5% / m" when there is no disturbance input.

[0065] [f. Dust cover removal status display] (f1. Display of dust cover removal status using address map) The detector management unit 48 of the receiver 10 also displays the results of determining the removal status of the dustproof covers 15 attached to the multiple analog smoke detectors 14. While any display format is possible, for example, as shown in Fig. 5, the display 36 displays an installation management screen 70 (70-1). The installation management screen 70 (70-1) displays a dustproof cover removal status 72 (72-1) using an address map. A system selection button 74 and an address selection button 76 are also provided to set conditions for selecting the analog smoke detectors 14 that display the dustproof cover removal status 72 (72-1).

[0066] The dust cover removed state 72 (72-1) shows the state when, for example, a dialog-style selection list is opened and "01 system list display" is selected using the system selection button 74. Here, the "system" corresponds to the signal lines drawn from the receiver 10, and for example, the signal lines 12 (12-1), 12 (12-2), and 12 (12-3) in FIG. 1 correspond to "01 system," "02 system," and "03 system."

[0067] In addition, in the dust cover removed state 72 (72-1), the 10th address 000, 010,... is displayed in the leftmost vertical column, and the 1st address 0, 1, 2... 9 is displayed in the topmost horizontal column. The intersection of the vertical and horizontal addresses indicates the terminal address, and the remaining addresses can be displayed by scrolling.

[0068] Furthermore, the dust cover removal status 72 (72-1) indicates that the dust cover is "not removed" with an "x" mark, "removed" with an "o" mark, and further indicates an "unused address" with a "-" mark. For this reason, the dust cover removal status 72 (72-1) in Fig. 5 is a display of the construction stage in which the analog smoke detector 14 equipped with the dust cover 15 is connected to the detector base 20, for example, as shown in Fig. 4(A), and with the exception of the unused addresses marked with a "-", the removal status of the dust cover 15 of the displayed analog smoke detector 14 is all marked with an "x" mark, indicating "not removed."

[0069] Figure 6 shows the construction management screen 70 (70-2) after construction work has progressed since the construction management screen 70 (70-1) in Figure 5 was displayed.According to the dust cover removal status 72 (72-2) in the screen, the six analog smoke detectors 14 with addresses 001 to 004, 062, and 089 have their dust covers 15 marked with an "X" to indicate that they have not been removed, but the remaining addresses have "◯" marks to indicate that their dust covers 15 have been removed.

[0070] In addition, by operating the address selection button 76, the address or address range of the analog smoke detector 14 connected to the signal line 12 (12-1) of the system selected by the system selection button 74, for example, the "01 system", can be arbitrarily selected, and the dust cover removal status can be displayed.

[0071] (f2. Displaying the dust cover removal status in list format) Figure 7 shows another display format of the dust cover removal status by the detector management unit 48, in which the installation management screen 80 displays the dust cover removal status 82 in list format, and also has a system selection button 74 and an address selection button 76.

[0072] The list-style dust cover removal status 82 has a list column for each analog smoke detector 14, and displays, for example, "list number," "system-address," "detector type," "installation location," and "dust cover removal status." For example, the top list column displays "list number" as "001," "system-address" as "01-001," "detector type" as "fire alarm (smoke analog)," "installation location" as "theater 1F east," and "dust cover removal status" as "dust cover x." This list-style dust cover removal status 82 can also be scrolled to view the status of all addresses.

[0073] Also, analog smoke detectors 14 whose dustproof covers 15 have been "removed" may not be displayed, and only analog smoke detectors 14 whose dustproof covers 15 have not been "removed" may be displayed in list form. Also, it may be possible to switch between displaying the status of all addresses and displaying only analog smoke detectors 14 whose dustproof covers 15 have not been "removed."

[0074] Alternatively, a period may be specified so that only analog smoke detectors 14 in which a predetermined state occurred during that period are displayed. For example, only those analog smoke detectors 14 whose connection time with the receiver 10 and the time when it was determined that the dust cover 15 was removed match the specified period are displayed.

[0075] [g. Determining whether the dust cover is removed based on the smoke detector burning test] The detector management unit 48 of the receiver 10 in FIG. 1 determines whether the dust cover 15 has been removed through a burning test of the analog smoke detector 14 that is carried out during construction.

[0076] The analog smoke detector 14 is subjected to a burning test by a tester using a test jig 90 on the analog smoke detector 14 connected to the signal line 12 (12-1) from the receiver 10, with the receiver 10 set to the detector test mode, as shown in FIG. 8. The test jig 90 is equipped with a smoke source that generates simulated test smoke, such as incense or aerosol. With the dust cover 15 removed, the test jig 90 is placed around the analog smoke detector 14 from below, allowing the test smoke to flow in. Upon receiving the test smoke, the analog smoke detector 14 detects the concentration of the test smoke and performs the same operations as those performed when detecting a fire, described above, with the receiver 10. The receiver 10 determines that a fire has occurred based on the test detection results and displays a test fire alarm, allowing the tester standing by the receiver 10 to determine that the test was successful.

[0077] In response to such a roasting test of an analog smoke detector 14, when the detector management unit 48 determines that a fire has occurred based on the detection results received from the analog smoke detector 14 and displays a fire alarm while the detector test mode is set, it determines that test information associated with the roasting test of the analog smoke detector 14 has been received, and determines that the dust cover 15 of the analog smoke detector 14 at the address that received the test information has been "removed."On the other hand, if the detector test information has not been received, it maintains its determination that the dust cover 15 has "not been removed."

[0078] Here, the detector management unit 48 will make redundant judgments of whether the dust cover has been removed based on the detection results received from the analog smoke detector 14 and whether the dust cover has been removed based on the roasting test, but will update and display the latest judgment results.

[0079] The "test information" used to determine whether the dust cover 15 has been removed refers to a response signal including a fire interrupt signal and / or detection results from the analog smoke detector 14 received in conjunction with a roasting test when the detector test mode is set in the receiver 10.

[0080] In addition to the aforementioned roasting test, the analog fire detector 14 can also be tested using the remote test function of the receiver 10. The remote test function is a test in which a test command signal is sent from the receiver 10 to the analog smoke detector 14, electrically causing the analog smoke detector 14 to perform the operation it would if it detected a fire, and can be performed regardless of whether the dust cover 15 is removed. For this reason, the detector management unit 48 of the receiver 10 will not determine that the dust cover 15 is "removed" if a fire is detected by the analog smoke detector 14 based on the remote test function.

[0081] [h. Reattaching the dust cover after the roasting test] When conducting a heat test on an analog smoke detector 14, the dust cover 15 must be removed. However, after the heat test is completed, if the detector installation location is expected to generate a lot of dust due to subsequent construction work, the removed dust cover 15 may be reattached to the analog smoke detector 14 that has undergone the heat test.

[0082] In this case, since the detection value S detected by the analog smoke detector 14 decreases when the dust cover 15 is reattached, the detection value S may fall below or equal to the threshold value Sth after it is determined that the dust cover 15 is "removed" in response to the roasting test. Therefore, after it is determined that the dust cover 15 is "removed," it may be determined that the protective cover is "not removed" when the detection value S becomes below or equal to the threshold value Sth, or when this continues for a predetermined period of time. Furthermore, it may be possible to arbitrarily set whether or not the process of determining that the protective cover is "not removed" is valid and the predetermined period of time for making the determination.

[0083] [i. Residential fire alarm] The fire monitoring system according to this embodiment also applies to a fire monitoring system consisting only of fire detectors (fire alarms). For example, residential fire alarms that detect fires and issue an alarm have been put into practical use and are widespread in order to monitor fires in ordinary homes. Such fire alarms are equipped with, for example, a detection unit that detects smoke density and an alarm unit that issues an alarm by sound and display, and are configured to issue a fire alarm upon detecting a fire, allowing the alarm to monitor and issue a fire alarm on its own. Wireless interlocking alarm systems have also been put into practical use and are widespread, in which multiple fire alarms are used as interlocking devices to form an interlocking group, and when any one alarm detects a fire and issues an alarm indicating the interlocking source, a fire interlocking signal is transmitted, and other alarms also interlock and output an alarm indicating the interlocking destination.

[0084] In the specific content of this embodiment, a function is provided to determine whether the dust cover that covers the smoke detection unit has been removed, based on the smoke density detected by such a fire alarm, in the same way as the fire monitoring system equipped with the above-mentioned multiple analog smoke detectors 14 and receiver 10. Furthermore, if the fire alarm determines that the dust cover has not been removed, it will output a warning alert by sound and display from the speaker and indicator light provided in the alarm unit.

[0085] [j. Modifications of the present invention] (Determining whether the dust cover is removed) The determination to remove the dust cover may be made not only in the construction and maintenance mode but also in an appropriate state such as in the normal monitoring mode for performing normal fire monitoring. The determination to remove the dust cover may be made in all states, or the determination to remove the dust cover may not be made when a priority process occurs, such as when a sign of a fire is detected based on the detection result of a fire detector or when a fire is detected based on the detection result of a fire detector or the operation of a transmitter.

[0086] Furthermore, it is more preferable to set the initial value of the determination result as "the dust cover 15 is not removed," and if the detection value S received from the analog smoke detector 14 is equal to or exceeds the threshold value Sth, to determine that the dust cover 15 is "removed" thereafter, but the determination method is not limited to this. For example, if the most recent detection value S received from the analog smoke detector 14 or a value based on the detection value S, such as its moving average value, is less than or equal to a predetermined threshold value Sth, it may be determined that the dust cover 15 is "not removed," and if it is equal to or exceeds the threshold value Sth, it may be determined that the dust cover 15 is "removed."

[0087] In addition, in the above embodiment, the detector management unit 48 determines whether the protective cover has been removed by making a determination based on both the smoke concentration from the analog smoke detector 14 and a determination based on a roasting test, but the determination may be made based on either one of them.

[0088] (Analog smoke detector) The above embodiment uses a scattered light type analog smoke detector as an example, but is not limited to this. For example, a dimming type analog smoke detector may be used. The dimming type analog smoke detector has a known dimming type smoke detection structure in which light from a light emitting unit is reflected by multiple mirrors arranged in a ring shape in the smoke detection space, and the optical path length to the light receiving unit is long enough to ensure sufficient dimming by smoke. Alternatively, the analog smoke detector may have a known combined smoke detection structure that integrates a scattered light type smoke detection structure and a dimming type smoke detection structure.

[0089] (others) Furthermore, the present invention 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]

[0090] 10: Receiver 12(12-1)~12(12-3): Signal line 14: Analog smoke detector 15: Dust cover 16: Repeater 18: Addressable transmitter 20: Sensor base 24: Smoke prevention equipment 26: Main CPU 28(28-1)~28(28-3): Sub-CPU board 30: Sub-CPU 32: Transmission unit 34: Serial transfer bus 36: Display 38: Display section 40:Operation unit 42: Acoustic alarm section 44:Transfer Department 46: Fire monitoring control unit 48: Sensor management department 50: Construction terminal information 52: Smoke Detection Department 54: Sensor control unit 56: Transmission unit 58: Power supply section 60: Light emitting drive unit 62: Photoreceiving amplifier 64: Light-emitting element 66: Photodetector 70(70-1)~70(70-3),80:Construction management screen 72(72-1), 72(72-2), 82: Dust cover removed 74: System selection button 76: Address selection button 90: Test fixture

Claims

1. A fire monitoring system having a fire detector that detects a detection target in a monitoring area, A fire monitoring system characterized by having a judgment unit that judges the removal status of the cover member for the fire detector based on whether a predetermined physical quantity detected by the fire detector to determine a fire satisfies a condition that is different from the condition for determining a fire.

2. 2. The fire monitoring system according to claim 1, A fire monitoring system characterized in that the judgment unit determines that the cover member of the fire detector has not been removed when, after determining that the cover member has been removed, conditions are met including the most recent detection value of the specified physical quantity or its moving average value being less than or equal to a specified threshold value.

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