JP2024120104A - Fire Monitoring System - Google Patents

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

The present invention relates to a fire monitoring system that monitors fires using fire detectors.

Conventionally, in an 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 certain fire detection conditions, it determines that there is a fire and outputs a fire alarm by sound and display to indicate the location of the fire.

During the construction of such fire monitoring systems, 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, to the receiver. Tests are then carried out on the connected terminals to check their operation, and the construction is then carried out in preparation for the final fire inspection.

Smoke detector installation involves installing the detector base on the monitored area, for example on the ceiling of a room, connecting it to a receiver, and fitting the smoke detector into the detector base for mechanical and electrical connections. The smoke detector irradiates detection light onto smoke that has flowed into the internal smoke detection section from the smoke inlet, and detects the smoke concentration by receiving the scattered light. In addition, a dust cover is attached to the smoke detector as a cover member when it is shipped from the factory, and the dust cover is left attached during installation to prevent the inflow of dust, and is removed before the final fire inspection is performed.

JP 2009-026259 A

However, checking whether the dust covers have been removed from the smoke detectors requires a visual inspection carried out by construction personnel on-site, and as smoke detectors are installed in various locations on each floor, such as rooms, corridors, and staircases, which are areas to be monitored, checking whether 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 in that area will be lost.

To solve this problem, for example, in residential fire alarms, as shown in Patent Document 1, a cover detection switch is provided that detects whether the dust cover has been removed, and an alarm is issued if the dust cover has been forgotten to be removed.

However, providing cover detection switches and other features that are not necessary for actual operation to the numerous smoke detectors installed in a fire monitoring system creates problems such as a complex structure and increased costs. Similar problems also exist with residential fire alarms.

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.

(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 monitored area, and is characterized in that it includes a judgment unit that, after determining that a cover member of the fire detector has been removed, judges that the cover member has not been removed when the detection value of a predetermined physical quantity detected by the fire detector to determine a fire satisfies a predetermined condition.

(Once the detection results meet certain conditions, it is determined that the device has been removed.)
When the amount of change in the detection value satisfies a predetermined condition and the determination unit determines that the cover is removed, the determination unit determines that the cover has been removed since the predetermined condition was satisfied.

(Fire monitoring system equipped with fire detectors and receivers)
The fire monitoring system also includes a receiver connected to a plurality of fire detectors,
The receiver includes a determination unit.

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

(Selective display of cover member removal state)
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.

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

(Remote testing from the receiver and determining whether the cover member has been 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.

(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 state of the cover member attached to the fire detector is determined based on the detection value of a predetermined physical quantity detected to detect a fire.This makes it possible to simply and easily check the removal state of the cover member of the fire detector without making any additional changes to the physical structure or function of the fire detector, and makes it possible to reliably prevent forgetting to remove the cover member.

(The effect of determining that removal is necessary once the detection results meet certain conditions)
In addition, when the detection result satisfies predetermined conditions, it is determined that the cover member has been removed from the time when the predetermined conditions are satisfied. This makes it possible to stably prevent the cover member from being removed even when the disturbance to the detection object fluctuates and the detection result no longer satisfies the predetermined conditions.

(Effectiveness of a fire monitoring system equipped with fire detectors and receivers)
In addition, when the 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, during construction work for the fire monitoring system, the removal status of the cover members can be simply and easily confirmed on the receiver side without going to the site, thereby reliably preventing the cover members from being forgotten to be removed.

(Effect of indicating the cover removal state)
In addition, by displaying the removal status of multiple cover members on the same screen, during construction work on a fire monitoring system, the removal status of the cover members for multiple fire detectors for which construction work has been completed on the receiver side can be simply and easily confirmed, for example by displaying a list.

(Effect of selectively displaying the cover member removal state)
In addition, the receiver can select a fire detector based on specified 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.Since the receiver 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, by selecting the fire detector as necessary, for example, by system, address or address range for each system, which is a signal line unit from the receiver, it is possible to easily and reliably know the removal status of the cover member by installation location, for example, by floor, district, room, etc.

(Effect of fire detection and determining whether cover material is removed)
In addition, if the receiver detects a fire by the fire detector, it 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 a test jig is used to let actual smoke or artificial smoke into the fire detector, causing it to sound a test alarm.Since it is essential to remove the cover member during the roasting test, if a fire is detected by the roasting test, it is determined 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.

(Effect of remote testing from the receiver and judging the removal status of the cover member)
In addition, the receiver has a remote testing function that causes the fire detector to perform the appropriate operation when a fire is detected, and if the fire detector detects a fire based on the remote testing function, it does not determine that the cover member has been removed.This is because 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 a mistaken determination that the cover member has been removed based on the fire detection during the remote test.

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. FIG. 4 is an explanatory diagram showing an example of construction management information stored in a receiver. FIG. 1 is an explanatory diagram showing an embodiment of a smoke detector. 4A and 4B are explanatory diagrams showing the attachment of a dustproof cover to a smoke detector, in which FIG. 4A shows the attachment of the dustproof cover and FIG. 4B shows the removal of the dustproof cover. 13 is an explanatory diagram showing a construction management screen that displays the removal state of the dust cover using an address map. FIG. This is an explanatory diagram showing the construction management screen following Figure 5, where the construction work has progressed. 13 is an explanatory diagram showing a construction management screen that displays the removal status of the dust cover in list form. FIG. FIG. 1 is an explanatory diagram showing a schematic diagram of a smoke detector roasting test performed with the dust cover removed.

Below, an embodiment of the fire monitoring system according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the following embodiment.

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

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

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 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.

The term "receiver" refers to a device that judges a fire and issues an alarm based on the detection results detected by multiple fire detectors, for example, multiple smoke detectors; for this reason, a unique address is assigned to each smoke detector, and the receiver judges a fire and issues an alarm based on the detection results received from each smoke detector by specifying the address. The receiver judges a fire to have occurred when the detection results satisfy a predetermined fire judgment condition, for example, when a detection value remains above a predetermined fire threshold for a predetermined accumulated time, and outputs a fire alarm by sound and display, and is a concept that includes R-type receivers that identify the installation location of the smoke detector and output a fire alarm.

The fire monitoring system of this embodiment is provided with a detector management unit that functions as a judgment unit in the receiver. Here, the "detector management unit" judges the removal state of the cover member of the smoke detector based on the detection value received from each fire detector, for example, the detection value received from each smoke detector.

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

Here, "input" includes, for example, the inflow of smoke or the like into the smoke detection unit, the radiation of heat into the heat detection unit, the incidence of light into the optical flame detection unit, the inflow of gas into the gas detection unit, etc. Furthermore, "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 fire in the case of a heat detection unit, light (radiation) other than fire in the case of an optical flame detection unit, and gas other than fire in the case of a gas detection unit.

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 beforehand when it is shipped from the factory, and is left attached during construction work and is removed before the construction work is completed.

The "detector management unit" determines whether the cover member of a smoke detector has been removed based on the detection results received from each smoke detector when the receiver is set to the construction 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."

The "construction and maintenance mode" is an operating mode that is set in the receiver by a specified operation during construction work on the fire monitoring system, and is a mode that suppresses (prohibits) audible fire alarms, interlocking control, and signal transfer control, 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. In contrast, after construction work is completed, the "fire monitoring mode" is set by a specified operation, and audible fire alarms, interlocking control, signal transfer control, etc. that were suppressed in the construction and maintenance mode are released and enabled in this mode.

In addition, when the cover member attached to the 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. Therefore, the detector management unit sets a threshold value that determines the slight increase in detection value associated with 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." The 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.

Furthermore, when a fire is detected by a fire detector, the detector management unit determines that the cover member of the fire detector has been removed. For example, when a fire is detected by a smoke detector test, the detector management unit determines that the cover member of the smoke detector has been removed. As an example, the detector management unit determines that the cover member attached to the smoke detector has been removed based on the test information received in conjunction with a smoke detector roasting test. Here, a "smoke detector roasting test" is a test in which a test jig is used to inject artificial smoke into the smoke detector to activate it, and the test is determined to be normal when the detection results received by the receiver from the test satisfy the specified fire judgment conditions and are determined to be a fire. When a smoke detector roasting test is performed, the cover member is always removed, so if the detector management unit receives the specified test information associated with the roasting test, this means that the cover member has been removed, and the detector management unit determines that the cover member has been removed.

On the other hand, the receiver is provided with a remote test function that causes the fire detector to perform the operation it would perform when it detects a fire, and if a fire is detected by the fire detector using this remote test function, it will not be determined that the cover member has been removed, since remote testing of the fire detector does not require the removal of the cover member. For example, remote testing of a smoke detector does not require the removal of the cover member, so even if a fire is detected by the smoke detector based on the remote test function, it will not be determined that the cover member has been removed.

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 "dust cover", the "removed state of the cover member" is the "removed state of the dust cover", and the "smoke detector test" is a "smoke detector roasting test".

[Specific Contents 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 described separately as follows.
a. Overview of the fire monitoring system b. Receiver b1. Receiver configuration b2. Installation terminal information b3. Fire monitoring control of the receiver c. Analog smoke detector d. Installation work of the fire monitoring system e. Determining whether the dust cover has been removed f. Displaying whether the dust cover has been removed f1. Displaying whether the dust cover has been removed using an address map f2. Displaying whether the dust cover has been removed using a list format g. Determining whether the dust cover has been removed based on a smoke detector roasting test h. Re-attaching the dust cover after the roasting test i. Residential fire alarm j. Modifications of the present invention

[a. Overview of the fire monitoring system]
The fire monitoring system according to this embodiment includes 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 manager's room of a building, and signal lines 12 (12-1) to 12 (12-3), which also serve as power supply lines, are drawn from the receiver 10 for each system to the monitoring area. Here, the "monitoring area" is an area to be monitored, an outdoor or indoor space with a certain extent, and is a concept including areas such as rooms, corridors, and stairs of a building, and hereinafter, the "monitoring area" is assumed to be a "room in a building."

Multiple analog smoke detectors 14 with transmission capabilities and unique addresses are connected to the signal line 12 (12-1). The dust covers 15 that are attached to the analog smoke detectors 14 at the time of shipment from the factory remain in place, blocking the smoke inlet and preventing dust from entering the internal smoke detector. The dust covers 15 are removed before the installation work is completed.

In addition to multiple analog smoke detectors 14, an addressable transmitter 18 with 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 with a transmission function and a unique address.

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.

[b. Receiver]
(b1. Receiver Configuration)
The R-type receiver 10 judges a fire based on at least the detection result received from 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 between them.

Connected to the main CPU 26 are a display 36 with a touch panel using a liquid crystal display 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 required for fire monitoring, an audio alarm unit 42 equipped with a speaker, and a reporting unit 44.

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.

(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 by system, address, type, line (signal line), floor, display message, and status, and the area name, for example, "Theater 1F East" or "Theater 1F East-1" is stored as a display message that is an arbitrary number, followed by a "cover flag" indicating the removal status of the dust cover 15, 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."

Note that addresses in the construction terminal information 50 where the type and subsequent fields are blank are unused addresses. Furthermore, the construction terminal information 50 stored in the main CPU 26 is used as is as terminal information for fire area display and interlocking control during operation when construction of the fire monitoring system is completed, the receiver 10 is switched to fire monitoring mode, and the fire monitoring control unit 46 is functioning.

(b3. Fire monitoring control of receiver)
After the installation work for 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.

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 sending and receiving signals to and from the analog smoke detector 14 according to a specific 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.

As an example, the sub-CPU 30 instructs the transmission unit 32 at regular intervals (e.g., one-minute intervals) to transmit a broadcast batch AD conversion command signal, which causes the analog smoke detector 14 to AD convert the detection value, which is the detection result detected based on the smoke concentration and disturbance input, as, for example, 8-bit data and hold it. Next, the sub-CPU 30 transmits a call signal including a polling command that sequentially specifies the terminal addresses.

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. In addition, the analog smoke detector 14 transmits a fire interrupt signal 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.

The sub-CPU 30 that receives the fire interrupt signal transmits a group search command signal to identify the group that includes 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.

The fire monitoring control unit 46 of the main CPU 26 judges that there is a fire when the detection result received from the sub-CPU 30 satisfies a predetermined fire judgment condition. For example, it judges that there is a fire when the detection value is equal to or exceeds a predetermined fire threshold, for example, the detection value when the smoke concentration is 10%/m, for a predetermined accumulated time. If it judges that there is a fire, it turns on the fire representative light of the display unit 38, outputs a predetermined main sound alarm indicating the occurrence of a fire from the speaker of the sound alarm unit 42, displays fire alarm information indicating the location of the fire on the display 36, and further outputs a fire alarm signal to the outside by the alarm transmission unit 44 to perform predetermined alarm transmission control, etc.

[c. Analog Smoke Detector]
The analog smoke detector 14 may have any configuration and function, but may, for example, as shown in Fig. 3, comprise a smoke detector section 52, a detector control section 54, a transmission section 56, a power supply section 58, a light emission drive section 60, and a light reception amplifier section 62. The smoke detector section 52 comprises a known scattered light type smoke detector 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 emission drive section 60 to irradiate light onto the smoke that has flowed into the smoke detection space, and the light scattered by the smoke is received by the light receiving element 66 to output a smoke concentration detection signal corresponding to the smoke concentration, which is then amplified by the light reception amplifier section 62 and output to the detector control section 54.

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 the 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, and then transmits a response signal including the detected detection value in response to the call signal that is subsequently received and specifies the self-address. In addition, 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. In addition, the detector control unit 54 transmits a response signal indicating that a fire interrupt has been performed in response to the group search command signal and the intra-group search command signal from the receiver 10.

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

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

Next, all terminals including the analog smoke detector 14 are tested to confirm that they are operating normally, and when all construction work is completed, a fire inspection is performed. If this is passed, the receiver 10 is switched to fire monitoring mode to start operation and enter fire monitoring control. As shown in FIG. 4(B), the protective cover 15 needs to be removed from the analog smoke detector 14 before construction work for the fire monitoring system is completed, and can be easily removed, for example, by pulling the dust cover 15 downward.

[e. Determination of dust cover removal state]
When the detector management unit 48 of the receiver 10 is set to the installation and maintenance mode, it determines whether the dust cover 15 attached to the analog smoke detector 14 has been removed based on the detection result 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 be determined that the dust cover 15 has been "removed" thereafter.

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.

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".

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

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

The dust cover removed state 72 (72-1) shows the state when, for example, a dialogue-style selection list is opened using the system selection button 74 and "01 system list display" is selected. Here, the "system" corresponds to the signal line drawn from the receiver 10; 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."

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

In addition, the dust cover removal status 72 (72-1) indicates that the dust cover is "not removed" with an "X" mark, that it is "removed" with an "O" mark, and further indicates "unused addresses" 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 an analog smoke detector 14 with a dust cover 15 attached is connected to a detector base 20, as shown in FIG. 4(A), for example, and with the exception of unused addresses marked with a "-", the removal status of the dust cover 15 of the analog smoke detector 14 displayed is all marked with an "X" mark, indicating that it is "not removed."

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 construction management screen, the six analog smoke detectors 14 with addresses 001 to 004, 062, and 089 are marked with an "X" to indicate that the dust covers 15 are "not removed," but the remaining addresses are marked with an "O" to indicate that the dust covers 15 are "removed."

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 "system 01", can be arbitrarily selected, and the dust cover removal status can be displayed.

(f2. Display of dust cover removal status in list format)
FIG. 7 shows another display form of the dust cover removal status by the detector management unit 48, in which a construction management screen 80 displays the dust cover removal status 82 in list format, and also provides a system selection button 74 and an address selection button 76.

The list-format 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-format dust cover removal status 82 can also be scrolled to view the status of all addresses.

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

A period may also be specified, and only analog smoke detectors 14 in which a specific state occurred during that period may be displayed. For example, only those analog smoke detectors 14 in which the time when the analog smoke detector 14 was connected to the receiver 10, the time when the dust cover 15 was determined to be removed, etc., match the specified period.

[g. Determination of dust cover removal status based on 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 performed during construction.

The analog smoke detector 14 is burnt 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, as shown in FIG. 8, with the receiver 10 set to the detector test mode. The test jig 90 is equipped with a smoke source that generates simulated test smoke, such as incense or spray, and 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. The analog smoke detector 14 that receives the test smoke detects the smoke density of the test smoke and performs the same operation as when a fire is detected as described above with the receiver 10. The receiver 10 determines that there is a fire based on the test detection results, and displays a test fire alarm, allowing the tester at the receiver 10 to determine that the test is normal.

For such a roasting test of an analog smoke detector 14, when the detector management unit 48 is set to the detector test mode and determines that a fire has occurred based on the detection results received from the analog smoke detector 14 and displays a fire alarm, 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 detector test information has not been received, it maintains the determination that the dust cover 15 has been "not removed."

Here, the detector management unit 48 performs 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 updates and displays the latest judgment results.

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

In addition to the above-mentioned 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 the receiver 10 sends a test command signal to the analog smoke detector 14, electrically causing the analog smoke detector 14 to perform the operation it would perform 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 does not determine that the dust cover 15 is "removed" if it detects a fire caused by the analog smoke detector 14 based on the remote test function.

[h. Reattaching the dust cover after the roasting test]
When performing a heat test on the analog smoke detector 14, the dust cover 15 must be removed. However, after the heat test is completed, if it is expected that the detector installation location will 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 completed the heat test.

In this case, since the detection value S detected by the analog smoke detector 14 decreases when the dust cover 15 is reinstalled, 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. In addition, it may be possible to arbitrarily set whether or not the process of determining that the cover is "not removed" is valid, and the predetermined period of time for making the determination.

[i. Residential fire alarm]
The fire monitoring system according to the present embodiment is also intended to be a fire monitoring system that is composed only of a fire detector (fire alarm). For example, in order to monitor fires in ordinary houses, a fire detector that detects fires and issues an alarm may be used. Fire alarms for home use have been put to practical use and are becoming more widespread. Such fire alarms are equipped with a detection unit that detects smoke concentration, for example, and an alarm unit that issues an alarm by sound and display. When a fire is detected, a fire alarm is issued, and the alarm can monitor and warn of a fire by itself. In addition, the fire alarm can be linked to a wireless system to form a linked group of multiple fire alarms, and any alarm can be connected to the group. When a fire is detected by one alarm device and an alarm sound is output indicating the link source, a fire link signal is sent and other alarm devices also link and output an alarm sound indicating the link destination. Alarm systems for this type of accident have also been put into practical use and are widespread.

In the specific content of this embodiment, a function is provided to determine the dust cover removal state regarding the removal of the dust cover that serves as the cover member for the smoke detection unit, based on the smoke concentration, which is the detection value of such a fire alarm, in the same manner 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.

[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 a normal monitoring mode in which normal fire monitoring is performed, etc. 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 fire warning sign 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.

Moreover, it is more preferable to set the initial value of the judgment result as the dust cover 15 being "not removed" and to judge that the dust cover 15 is "removed" from then on when the detection value S received from the analog smoke detector 14 is equal to or exceeds the threshold value Sth, but the judgment 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 judged that the dust cover 15 is "not removed," and if it is equal to or exceeds the threshold value Sth, it may be judged that the dust cover 15 is "removed."

In addition, in the above embodiment, the detector management unit 48 judges whether the protective cover has been removed based on both the smoke concentration from the analog smoke detector 14 and the roasting test, but the detector may be configured to judge based on either one of them.

(Analog smoke detector)
The above embodiment is an example of a light scattering type analog smoke detector, but is not limited thereto. For example, a light-dimming type analog smoke detector may be used. The light-dimming type analog smoke detector is provided with a known light-dimming type smoke detector structure in which light from a light-emitting unit is reflected by a plurality of mirrors arranged in a circular ring shape in a smoke detection space, and the optical path length to the light-receiving unit is made long enough to obtain sufficient light dimming due to smoke. Also, the analog smoke detector may be provided with a known composite smoke detector structure that is provided with a light scattering type smoke detector structure and a light-dimming type smoke detector structure in one body.

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

10: Receiver 12 (12-1) to 12 (12-3): Signal line 14: Analog smoke detector 15: Dust cover 16: Repeater 18: Addressable transmitter 20: Detector base 24: Smoke control device 26: Main CPU
28 (28-1) to 28 (28-3): Sub-CPU board 30: Sub-CPU
32: Transmission section 34: Serial transfer bus 36: Display 38: Display section 40: Operation section 42: Acoustic alarm section 44: Reporting section 46: Fire monitoring control section 48: Detector management section 50: Construction terminal information 52: Smoke detection section 54: Detector control section 56: Transmission section 58: Power supply section 60: Light emission driving section 62: Light receiving amplification section 64: Light emitting element 66: Light receiving element 70 (70-1) to 70 (70-3), 80: Construction management screen 72 (72-1), 72 (72-2), 82: Dust cover removal status 74: System selection button 76: Address selection button 90: Test jig

Claims (1)

A fire monitoring system having a fire detector for detecting a detection target in a monitoring area,
A fire monitoring system characterized by comprising a judgment unit that judges that the cover member of the fire detector has not been removed when, after determining that the cover member of the fire detector has been removed, the detection value of a predetermined physical quantity detected by the fire detector to determine a fire satisfies a predetermined condition.