Fire alarm system

Abstract

To allow appropriate countermeasures even to a non-fire factor by increasing the accuracy of fire discrimination to discriminate between a fire and a non-fire factor.SOLUTION: A fire alarm facility 1 monitors fire in a warning area to raise an alarm and comprises: a photoelectric smoke sensor 14 which transmits a fire signal including identification information of a fire and a non-fire factor in the warning area; an entering / leaving management system 100 which detects presence or absence of a person in the warning area and transmits a detection signal; and a fire alarm control unit 48 which discriminates between the fire and the non-fire factor on the basis of the fire signal from the photoelectric smoke sensor 14, wherein the fire alarm control unit 48 suspends output of an attention alarm indicating occurrence of the non-fire factor when the presence of the person in the warning area is discriminated on the basis of the detection signal upon discriminating the non-fire factor, and outputs the attention alarm indicating occurrence of the non-fire factor when the absence of the person in the warning area is discriminated on the basis of the detection signal upon discriminating the non-fire factor.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a fire alarm device that monitors a fire by connecting a fire detector to a receiver.

Background Art

[0002] Conventionally, in a fire alarm device known as type R, a fire detector having a transmission function with a unique address is connected to a receiver. In the normal monitoring state, detection values such as smoke density and temperature are collected and monitored by calling fire detectors with sequentially specified detector addresses. In the event of a fire, based on the fire interrupt signal from the fire detector, a search command is issued from the receiver to identify the address of the fire detector that has issued an alarm, collect the detection values, and when the detection value exceeds a predetermined fire alarm threshold value, it is determined as a fire and a fire alarm is output. Further, interlock control such as an exhaust device, a fire door, and automatic notification to a fire department is performed.

[0003] Also, in conventional fire alarm devices, a photoelectric smoke detector that detects smoke caused by a fire is used as the fire detector. Conventional photoelectric smoke detectors may issue non-fire alarms not only due to smoke caused by a fire but also due to cooking smoke, bathroom steam, etc.

[0004] In order to prevent non-fire alarms caused by such non-fire causes, a so-called two-wavelength type photoelectric smoke detector has been proposed that irradiates a smoke detection space with light of two wavelengths, determines the type of smoke by obtaining the ratio of the light intensities of different wavelengths for the scattered light caused by the smoke, and enhances the accuracy of smoke discrimination to ensure prevention of non-fire alarms (Patent Document 2).

Prior Art Documents

Patent Documents

[0005] <http: / / www.google.co.jp / patents / ja / 2007-265353.html>[^1]

Patent Document 1

Patent Document 2

Patent Document 3

[0006] Incidentally, when a conventional two-wavelength photoelectric smoke detector like this is connected to a receiver to monitor a fire, the receiver can identify whether the smoke is white smoke from a smoldering fire or black smoke from a combustion fire and output a fire alarm, allowing for a response appropriate to the level of fire danger.

[0007] However, if steam from a bathroom or similar source enters a photoelectric smoke detector, it may produce an identification result similar to that of white smoke caused by a smoldering fire. This leaves the possibility that the detector may mistakenly identify a non-fire factor such as steam as a white smoke fire and issue a false fire alarm.

[0008] The present invention aims to provide a fire alarm system that improves the accuracy of fire detection, distinguishes between fires and non-fire factors, and enables appropriate action against non-fire factors. [Means for solving the problem]

[0009] (Fire alarm system) The present invention relates to a fire alarm system that monitors and sounds out for fires in a protected area, A fire detector that transmits a fire signal containing identification information of fires and non-fire factors in a protected area, A person detection means that detects the presence or absence of people in a restricted area and transmits a detection signal, A fire alarm control unit that determines whether a fire is occurring or not based on a fire signal from a fire detector, Equipped with, The fire alarm control unit is After identifying non-fire factors and detecting the presence of people in the protected area based on the detection signal, the output of the warning alert indicating the occurrence of a non-fire factor is withheld. The system is characterized by outputting a warning alert indicating the occurrence of a non-fire factor when it has identified a non-fire factor and, based on the detection signal, has determined that there are no people in the protected area. [Effects of the Invention]

[0010] (Basic effects) The present invention relates to a fire alarm system that monitors and alerts to fires in a protected area, comprising: a fire detector that detects a fire in the protected area and transmits a fire signal; a human detection means that detects the presence or absence of people in the protected area and transmits a detection signal; and a fire alarm control unit that, based on the fire signal from the fire detector and the detection signal from the human detection means, outputs a warning alert instead of a fire alarm when it determines that there is a low-risk fire or the presence of people in the protected area. Therefore, if there is a high possibility that non-fire factors such as steam from a bathroom or kitchen are being generated by occupants, the system will only issue a warning alert instead of a fire alarm, and by notifying occupants with a warning alert, it is possible to respond to a fire even if it is a fire and not a non-fire factor.

[0011] (Effectiveness of fire alarms) The fire alarm control unit outputs a fire alarm when it detects a low-risk fire and then determines that no one is present in the protected area, or when it detects a high-risk fire. This allows for immediate response to a fire when there are no occupants and the likelihood of non-fire factors such as steam from bathrooms or kitchens is low, or in the case of a high-risk fire.

[0012] (Fire alarm output corresponding to the level of fire risk) The fire alarm control unit outputs different fire alarms corresponding to the determined level of fire risk, enabling necessary actions to be taken according to the state of the fire. [Brief explanation of the drawing]

[0013] [Figure 1] An explanatory diagram showing an embodiment of a fire alarm system combined with an access control system. [Figure 2]Explanatory drawing showing the outline of the entry / exit management system in FIG. 1 [Figure 3] Block diagram showing the circuit configuration of the photoelectric smoke sensor provided in the fire alarm equipment in FIG. 1 [Figure 4] Explanatory drawing showing an embodiment of the structure of the smoke detection section in FIG. 3 [Figure 5] Explanatory drawing showing the smoke detection value detected by the smoke detection section structure of FIG. 3 and its ratio with respect to the smoke when a cotton wick and kerosene are burned [Figure 6] Flowchart showing the control operation in the receiver in FIG. 1 [Figure 7] Flowchart showing the control operation in the photoelectric smoke sensor in FIG. 3 [Figure 8] Explanatory drawing showing an embodiment of the fire alarm equipment combined with a human presence sensor [Figure 9] Explanatory drawing showing an embodiment of the fire alarm equipment combined with a security system [Embodiments for Carrying Out the Invention]

[0014] [Fire Alarm Equipment] (Outline of Fire Alarm Equipment) FIG. 1 is an explanatory drawing showing an embodiment of the fire alarm equipment combined with an entry / exit management system. As shown in FIG. 1, for example, an R-type receiver 10 is installed in a monitoring center or a manager's room of a facility where the fire alarm equipment 1 is installed, and signal lines 12-1 to 12-3 are drawn out from the receiver 10 separately for each system to the警戒区域.

[0015] A plurality of photoelectric smoke sensors 14 having a transmission function with a unique address are connected to the signal line 12-1. The photoelectric smoke sensor 14 is a so-called two-wavelength type photoelectric smoke sensor having a function of detecting a first smoke detection value A1 by receiving scattered light of smoke by setting light of a first wavelength λ1 and a first scattering angle θ1, and detecting a second smoke detection value A2 by receiving scattered light of smoke by setting light of a second wavelength λ2 and a second scattering angle θ2.

[0016] Here, the first smoke detection value A1 and the second smoke detection value A2 may simply be referred to as smoke detection value A1 and smoke detection value A2 in the following explanation.

[0017] In addition to the so-called two-wavelength photoelectric smoke detector 14, conventional photoelectric smoke detectors and heat detectors equipped with transmission functions are connected to the signal line 12-1. On / off type fire detectors and transmitters are also connected to the detector line drawn out from the repeater equipped with a transmission function, but these are not shown in the diagram.

[0018] Control devices such as district sound systems 18, exhaust systems 20, and fire doors 22 are connected to signal lines 12-2 and 12-3 via repeaters 16, which have transmission functions and are assigned unique addresses.

[0019] The district sound device 18 outputs a predetermined district sound alarm to notify the area of ​​a fire under control from the receiver 10. In this embodiment, if the receiver 10 detects a white smoke fire, it outputs a district sound alarm that includes a message prompting on-site confirmation. If the receiver 10 detects a black smoke fire, it outputs a district sound alarm that includes a message prompting evacuation.

[0020] The exhaust system 20 is activated by a control instruction from the receiver 10 to ventilate the protected area. The fire door 22 is operated to the closed position by a control instruction from the receiver 10, releasing the latch that holds it open, thereby closing off the compartment where the fire occurred and suppressing the spread of the fire.

[0021] The maximum number of addresses per signal line that can be set for terminal devices such as photoelectric smoke detectors 14 and repeaters 16 connected to signal lines 12-1 to 12-3 is, for example, 255, and a maximum of 255 terminal devices can be connected to each of the signal lines 12-1 to 12-3.

[0022] (Functional configuration of the receiver) The receiver 10 is equipped with a main CPU 26 and sub-CPU boards 28-1 to 38-3, each of which is equipped 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.

[0023] The main CPU 26 is connected to a touch panel display 36 using an LCD display panel or the like, a display unit 38 equipped with indicator lights for fire, gas leak, and fault, LED indicator lights, etc., an operation unit 40 equipped with various switches necessary for fire monitoring, such as a fire detection switch, a zone sound stop switch, and a transmission stop switch, an audible alarm unit 42 equipped with a speaker, and a transmission unit 44.

[0024] Although not shown in the diagram, the emergency broadcasting device and automatic reporting device are connected to the transmission unit 44 as transmission destinations. The emergency broadcasting device operates in response to the transmission signal from the receiver 10 and outputs an emergency broadcast from speakers installed in the restricted area to announce the occurrence of a fire and to guide people to evacuate. When the emergency broadcasting device is activated, the area sound alarm by the area sounding device 18 is stopped. The automatic reporting device operates in response to the transmission signal from the receiver 10 and makes a 119 call to the fire department via a public telephone line to report the occurrence of a fire.

[0025] Furthermore, a communication adapter 45 is connected to the main CPU 26, and the communication adapter 45 sends and receives signals to and from the access control system 100.

[0026] (Access control system) Figure 2 is an explanatory diagram illustrating the general layout of an access control system. As shown in Figure 2, the access control system 100 installed in facilities such as office buildings and factories consists of a central unit 102, clients 104, a local control panel 108, a card reader 110 for entry and exit, and an electric lock 112.

[0027] The central device 102 is installed in a monitoring center or management office, while the client 104 is installed in the general affairs department that handles access control. Local control panels 108 are installed, for example, on each floor of the facility. The local control panels 108 are connected to the central device 102 and the client 104 by LAN lines 106.

[0028] The card reader 110 is located on the outside of the door that serves as the entrance to each room, and the door is equipped with an electric lock 112. The card reader 110 and the electric lock 112 are connected to signal lines from a local control panel 108 located on the same floor.

[0029] The card reader 110 reads predetermined user identification information recorded on the magnetic card or contactless IC card carried by the user, compares it with pre-registered user identification information, and if authentication is successful based on a match, transmits an authentication signal to the local control panel 108.

[0030] When the local control panel 108 receives an authentication signal from the card reader 110, it transmits the authentication signal to the central device 102 via the LAN line 106, causing the central device 102 to record the arrival or departure time in the entry / exit information it manages. Furthermore, when the local control panel 108 receives an authentication signal from the card reader 110, it outputs a control signal to the electric lock 112 installed at the corresponding entrance / exit to unlock it, enabling entry and exit.

[0031] The central device 102 has the function of displaying management information such as maps of facilities where the access control system 100 is installed, as well as the function of a database that stores and manages access information indicating the status of occupants.

[0032] Client 104 is connected to the central unit 102 and the local control panel 108 via the LAN line 106, and performs various settings and processes such as registration, deletion, and history retrieval of user identification information compatible with magnetic cards and contactless IC cards in communication with the card reader 110 via the local control panel 108.

[0033] In addition, in this embodiment, a communication adapter 114 is connected to the central device 102, and the communication adapter 114 is connected to a communication adapter 45 provided on the receiver 10 of the fire alarm system 1 shown in Figure 1, and can transmit an entry / exit management signal indicating the status of occupants in response to a request from the receiver 10.

[0034] [Receiver control function] As shown in Figure 1, the main CPU 26 of the receiver 10 is provided with a fire alarm control unit 48, which is a function realized by the execution of a program.

[0035] Furthermore, the sub-CPUs 30 provided on the sub-CPU boards 28-1 to 28-3 of the receiver 10 are equipped with a transmission control unit 46, which is a function realized by program execution. The transmission control unit 46 provided on the sub-CPU 30 of sub-CPU board 28-1 controls the collection of a first smoke detection value A1 and a second smoke detection value A2 detected by a two-wavelength photoelectric smoke detector 14 connected to the signal line 12-1.

[0036] Furthermore, the transmission control units 46 of the sub-CPU boards 28-2 and 38-3 perform fire-linked control by transmitting control signals that specify the addresses of the repeaters 16 to which control devices such as the district sound system 18, exhaust system 20, and fire door 22, which are connected to the respective signal lines 12-2 and 12-3, are connected.

[0037] (Collection and control of sensor detection data) The transmission control unit 46, located on the sub-CPU 30 of the sub-CPU board 28-1, controls the collection of detection data by instructing the transmission unit 32 to send and receive signals to and from the photoelectric smoke detector 14 connected to the signal line 12-1 according to a predetermined communication protocol.

[0038] The downstream signal from the transmission unit 32 to the photoelectric smoke detector 14 is transmitted in voltage mode. This voltage mode signal is transmitted as a voltage pulse that changes the line voltage of the signal line 12-1 between, for example, 18 volts and 30 volts.

[0039] In contrast, the upstream signal from the photoelectric smoke detector 14 to the transmission unit 32 is transmitted in current mode. In this current mode, a signal current is passed through the signal line 12-1 at the timing of bit 1 of the transmission data, and the upstream signal is transmitted to the receiver 10 as a so-called current pulse train.

[0040] The data acquisition control by the transmission control unit 46 of the sub-CPU 30, during normal monitoring, instructs the transmission unit 32 at regular intervals to send a broadcast batch AD conversion signal including a batch AD conversion command. The photoelectric smoke detector 14, upon receiving this batch AD conversion signal, converts the smoke detection signal signals of the first smoke detection value A1 and the second smoke detection value A2 output from the smoke detection unit into digital smoke detection value signals via AD conversion and stores them.

[0041] Next, the transmission control unit 46 of the sub-CPU 30 transmits a call signal that includes a polling command specifying terminal addresses sequentially. When the photoelectric smoke detector 14 receives a call signal with an address that matches its own address, it transmits a call response signal to the receiver 10 that includes the first smoke detection value A1 and the second smoke detection value A2 that it holds at that time.

[0042] Furthermore, if the photoelectric smoke detector 14 is equivalent to a smoke detector with a sensitivity of 2, for example, a smoke concentration threshold of 5.0% / m, is set as the warning threshold AP1th for the first smoke detection value A1 in the photoelectric smoke detector 14. When the detected first smoke detection value A1 is equal to or greater than the warning threshold AP1th, it is determined that a fire has occurred and a fire interrupt signal is sent to the receiver 10.

[0043] Alternatively, the photoelectric smoke detector 14 may be configured to have a smoke concentration threshold equivalent to a Class 1 sensitivity, for example, a smoke concentration threshold of 5.0% / m, set as the warning threshold AP2th for the second smoke detection value A2. If the detected second smoke detection value A2 exceeds the warning threshold AP2th, it may be determined that a fire has occurred, and a fire interrupt signal may be sent to the receiver 10.

[0044] When the transmission control unit 46 of the sub-CPU 30 receives a fire interrupt signal from the photoelectric smoke detector 14 via the transmission unit 32, it transmits a group search command signal to identify the group including the photoelectric smoke detector 14 that sent the fire alarm. Subsequently, it transmits an in-group search command signal to identify the address of the photoelectric smoke detector 14 that sent the fire alarm, intensively collects the first and second smoke detection values A1 and A2, and transmits them to the main CPU 26 via the serial transfer bus 34.

[0045] The intensive collection of the first and second smoke detection values A1 and A2 by the transmission control unit 46 of the sub-CPU 30 shortens the transmission cycle of the batch AD conversion signal. After transmitting the batch AD conversion signal, by transmitting a call signal specifying the address of the photoelectric smoke detector 14 that sent the fire alarm, the first smoke detection value A1 and the second smoke detection value A1 of the photoelectric smoke detector 14 are continuously collected.

[0046] (Fire alarm control) The fire alarm control unit 48 of the main CPU 26 calculates the ratio R = A1 / A2 from the first smoke detection value A1 and the second smoke detection value A2 received from the sub-CPU 30, and compares it with a predetermined ratio threshold value Rth. If R ≥ Rth, it discriminates a white smoke fire; if R < Rth, it discriminates a black smoke fire. The details of the discrimination of white smoke fire and black smoke fire by the fire alarm control unit 48 will be clarified in the later description of the photoelectric smoke detector 14.

[0047] Subsequently, the fire alarm control unit 48 of the main CPU 26 instructs the communication adapter 45 to establish a communication connection with the center device 102 of the entry / exit management system 100 shown in FIG. 2 via the communication adapter 114, and receives the entry / exit management information indicating the status of the occupants managed by the center device 102 at that time to discriminate the presence or absence of occupants.

[0048] Subsequently, if the fire alarm control unit 48 of the main CPU 26 has discriminated a white smoke fire, for example, when the first smoke detection value A1 is, for example, above the fire alarm threshold value A1th = 10% / m corresponding to the two sensitivity settings of the photoelectric smoke detector 14, it performs fire alarm control according to the presence or absence of occupants.

[0049] When the fire alarm control unit 48 detects a white smoke fire and also detects the presence of occupants, it determines that some non-fire factor exists and performs control to output a warning alarm instead of a fire alarm.

[0050] Furthermore, when the fire alarm control unit 48 detects a white smoke fire and determines that there are no occupants, it determines that it is a white smoke fire in which white smoke is slowly increasing due to a smoldering fire, and performs control to output a fire alarm indicating a white smoke fire.

[0051] When the fire alarm control unit 48 signals a white smoke fire, it illuminates the fire indicator light on the display unit 38, outputs a predetermined main audible alarm from the speaker of the audible alarm unit 42 to indicate the occurrence of a fire, displays fire alarm information on the display 36, including the location of the fire and type information indicating a white smoke fire, based on the sensor address where the fire was detected, and further performs predetermined white smoke fire interlocking control.

[0052] The white smoke fire interlocking control by the fire alarm control unit 48 transmits a district sound control signal specifying the address of the district sound device 18 in the protected area corresponding to the address of the photoelectric smoke detector 14 that triggered the fire alarm (i.e., the address of the relay unit 16 to which the district sound device 18 is connected). By activating the specified district sound device 18, the control unit outputs a district sound alarm that includes an audio message encouraging residents to check the site, as a white smoke fire is a fire that generates white smoke due to smoldering in the initial stages of the fire.

[0053] Furthermore, the white smoke fire interlocking control by the fire alarm control unit 48 sends a control signal specifying the address of the exhaust device 20 installed in the protected area corresponding to the address of the photoelectric smoke detector 14 that triggered the fire alarm (i.e., the address of the relay unit 16 to which the exhaust device 20 is connected). This activates the exhaust device 20, causing the white smoke generated by the smoldering fire to be discharged to the outside for ventilation.

[0054] On the other hand, if the fire alarm control unit 48 of the main CPU 26 has identified, for example, a black smoke fire, it will determine that the rapidly expanding combustion fire is generating black smoke and is therefore highly dangerous, and will perform control to output a fire alarm indicating a black smoke fire, regardless of whether there are people in the room or not.

[0055] When the fire alarm control unit 48 signals a black smoke fire, it illuminates the fire indicator light on the display unit 38, outputs a predetermined main audible alarm from the speaker of the audible alarm unit 42 to indicate the occurrence of a fire, displays fire alarm information on the display 36, including the location of the fire and type information indicating a black smoke fire, based on the sensor address where the fire was detected, and further performs predetermined black smoke fire interlocking control.

[0056] The smoke fire interlocking control by the fire alarm control unit 48 activates the area sound device 18, exhaust device 20, and fire door 22 by transmitting a control signal that specifies the address of the relay 16 connected to the area sound device 18, exhaust device 20, and fire door 22, which are installed in the protected area corresponding to the address of the photoelectric smoke detector 14 that triggered the fire alarm.

[0057] Based on the identification of this black smoke fire, the district sound device 18 activates a district sound alarm. Because black smoke fires are highly dangerous due to the rapid spread of black smoke caused by combustion, the alarm includes an audio message urging residents to evacuate. Additionally, the activation of the exhaust device 20 based on the identification of the black smoke fire ventilates the fire-affected compartment, and the activation of the fire door 22 closes the fire-affected compartment to suppress the spread of the fire.

[0058] Furthermore, as part of the smoke fire interlocking control by the fire alarm control unit 48, it instructs the signal transfer unit 44 to output a signal transfer signal to an emergency broadcasting device and an automatic notification device (not shown) to perform interlocking control. The emergency broadcasting device is activated by the signal transfer signal from the receiver 10 and broadcasts an emergency message from speakers installed in the restricted area, announcing the occurrence of a fire and urging evacuation. At this time, the fire alarm control unit 48 sends a stop signal to the area sound device 18 to stop the output of the area sound alarm, ensuring that the emergency broadcast can be heard clearly.

[0059] Furthermore, the automatic reporting device is activated by a transmission signal from the receiver 10, and automatically notifies the fire department of the fire by making a 119 call using a public telephone line and requests firefighting.

[0060] [Photoelectric smoke detector] (Circuit configuration) Figure 3 is a block diagram showing the circuit configuration of a photoelectric smoke detector installed in the fire alarm system shown in Figure 1. As shown in Figure 3, the photoelectric smoke detector 14 of this embodiment consists of a detector control unit 50 composed of a computer circuit equipped with a CPU, memory, and various input / output ports; a transmission unit 52 that sends and receives signals to and from the receiver 10 via a signal line 12 connected to an S terminal and an SC terminal; a power supply unit 54 that converts the power supply voltage supplied via the signal line 12 into a predetermined stabilized voltage and outputs it; a light emission drive unit 56; a smoke detection unit 60; and amplification circuit units 68 and 70.

[0061] The smoke detection unit 60 is provided with a light-emitting element 62 that simultaneously emits light including a first wavelength λ1 and a second wavelength λ2. The light of the first wavelength λ1 emitted from the light-emitting element 62 has a central wavelength of 600 nm or more, and the light of the second wavelength λ2 has a central wavelength of 500 nm or less. In this embodiment, the first wavelength λ1 is set to, for example, 700 nm, and the second wavelength λ2 is set to, for example, 450 nm.

[0062] In this embodiment, a white LED (white light-emitting diode) is used as the light-emitting element 62. The white LED is, for example, a combination of a blue LED and a phosphor. The light from the blue LED is passed through the phosphor to emit white light, and this emitted color includes light with a first wavelength λ1 = 700 nm and light with a second wavelength λ2 = 450 nm. This allows the smoke detection unit 60 to be simultaneously irradiated with light of the first wavelength λ1 and the second wavelength λ2.

[0063] Furthermore, a two-color LED (two-color light-emitting diode) can also be used as the light-emitting element 62 in this embodiment. The two-color LED comprises a first light-emitting chip that emits light at a first wavelength λ1 = 700 nm and a second light-emitting chip that emits light at a second wavelength λ2 = 450 nm. By driving both simultaneously, the light at the first wavelength λ1 and the second wavelength λ2 can be simultaneously irradiated into the smoke detection unit 60.

[0064] The first photodetector 64 uses a photodiode (PD) that is sensitive to a first wavelength λ1, and the second photodetector 66 uses a photodiode (PD) that is sensitive to a second wavelength λ2.

[0065] Furthermore, the first photodetector 64 and the second photodetector 66 may be broadband photodiodes sensitive to the visible light wavelength band, with filter layers that receive only the wavelength bands of the first wavelength λ1 and the second wavelength λ2 provided on the PD molding (transparent cover member), or filters that transmit the wavelength bands of the first wavelength λ1 and the second wavelength λ2 may be placed in front of the broadband photodiode.

[0066] The amplification circuit 68 amplifies the received signal of smoke scattered light of the first wavelength λ1 received by the first light receiving element 64 and outputs a received signal to the sensor control unit 50 that becomes the first smoke detection value A1. The amplification circuit 70 also amplifies the received signal of smoke scattered light received by the second light receiving element 66 and outputs a received signal to the sensor control unit 50 that becomes the second smoke detection value A2.

[0067] (Smoke detection department) Figure 4 is an explanatory diagram showing an embodiment of the structure of the smoke detection unit in Figure 3. As shown in Figure 4, a light-emitting element 62, a first light-receiving element 64, and a second light-receiving element 66 are arranged inside the smoke detection unit 60 into which smoke from the outside flows.

[0068] For example, a light-emitting element 62 using a white LED irradiates light containing a first wavelength λ1 and a second wavelength λ2 in the direction of the optical axis 62a. As mentioned above, the light of the first wavelength λ1 is set to 700 nm, and the light of the second wavelength λ2 is set to 450 nm.

[0069] The first scattering angle θ1, formed by the intersection of the optical axis 62a of the light-emitting element 62 and the optical axis 64a of the first light-receiving element 64, is set to a range of 20° to 70°, and the optical axis 62a of the light-emitting element 62 and the optical axis 64a of the first light-receiving element 64 are arranged to intersect at a predetermined angle in the range of 110° to 160°.

[0070] Furthermore, the second scattering angle θ2, which is formed by the intersection of the optical axis 62a of the light-emitting element 62 and the optical axis 66a of the second light-receiving element 66, is set to a range of 110° to 150°, and the light-emitting element 62 and the optical axis 66a of the second light-receiving element 66 are arranged to intersect at a predetermined angle in the range of 30° to 70°.

[0071] In this embodiment, since the first scattering angle θ1 is set to 30°, the optical axis 62a of the light-emitting element 62 and the optical axis 64a of the first light-receiving element 64 are arranged to intersect at an intersection angle of, for example, 150°. Also, since the second scattering angle θ2 is set to 120°, the optical axis 62a of the light-emitting element 62 and the optical axis 66a of the second light-receiving element 66 are arranged to intersect at an intersection angle of, for example, 60°.

[0072] Since the first light-receiving element 64 is sensitive to light of a first wavelength λ1 = 700 nm emitted from the light-emitting element 62, when the light-emitting element 62 emits light of the first wavelength λ1, the scattered light with a scattering angle θ1 = 30° from the smoke that has entered the smoke detection unit 60 is received by the first light-receiving element 64, and the first smoke detection value A1 is obtained.

[0073] Furthermore, since the second light-receiving element 66 is sensitive to the second wavelength λ2 = 450 nm light emitted from the light-emitting element 62, when the light-emitting element 62 emits the second wavelength λ2 light simultaneously with the first wavelength λ1 light, the scattered light with a second scattering angle θ2 = 120° from the smoke flowing into the smoke detection unit 60 is received by the second light-receiving element 66, and the second smoke detection value A2 is obtained simultaneously.

[0074] When the sensor control unit 50 shown in Figure 3 receives a batch AD conversion signal from the receiver 10 via the transmission unit 52, it instructs the light-emitting drive unit 56 to drive the light-emitting element 62, thereby emitting white light including a first wavelength λ1 and a second wavelength λ2. The forward scattered light with a first scattering angle θ1 = 30° due to the first wavelength λ1 is received by the first light-receiving element 64, and the first smoke detection value A1 output from the amplification circuit unit 68 in response is converted to digital data via AD conversion, read, and stored in memory.

[0075] At the same time, backscattered light with a second scattering angle θ2 = 120° due to the second wavelength λ2 is received by the second light-receiving element 66. The sensor control unit 50 reads the second smoke detection value A2 output from the amplification circuit unit 70 in response to the reception by the second light-receiving element 66 by A / D conversion and stores it in memory.

[0076] Next, the sensor control unit 50 compares the first smoke detection value A1 stored in memory with a predetermined warning threshold AP1th corresponding to the set sensitivity of the photoelectric smoke detector 14. If the first smoke detection value A1 is equal to or greater than the warning threshold AP1th, it determines that a fire alarm has been triggered and instructs the transmission unit 52 to transmit a fire interrupt signal to the receiver 10.

[0077] Here, the warning threshold AP1th is set as follows: if the photoelectric smoke detector 14 is equivalent to a Type 2 sensitivity with a fire alarm threshold A1th of 10% / m, for example, AP1th = 5% / m, which corresponds to a Type 1 sensitivity. Also, if the photoelectric smoke detector 14 is equivalent to a Type 3 sensitivity with a fire alarm threshold A1th of 15% / m, APth is set as equivalent to a Type 2 sensitivity, for example, APth = 10% / m.

[0078] (Distinguishing between white smoke fires and black smoke fires) Figure 5 is an explanatory diagram showing the smoke detection values ​​and their ratios detected by the smoke detection unit structure in Figure 4 when burning cotton wick and kerosene.

[0079] As shown in Figure 5, the first smoke detection value A1 is the received output of scattered light with a first wavelength λ1 = 700 nm and a first scattering angle θ1 = 30°, and the second smoke detection value A2 is the received output of scattered light with a second wavelength λ2 = 450 nm and a second scattering angle θ2 = 120°.

[0080] When the ratio R=A1 / A2 of the first and second smoke detection values ​​A1 and A2 measured during the combustion of cotton wick and kerosene is taken, R=8.0 is obtained for cotton wick and R=2.3 for kerosene. A significant difference in the ratio R between cotton wick and kerosene is observed, making it possible to distinguish between types of smoke based on the ratio R.

[0081] Therefore, by setting a ratio threshold Rth = 5 for identifying the type of smoke, if R ≥ 5, it can be determined that it is a white smoke fire where white smoke is produced by smoldering, and if R < 5, it can be determined that it is a black smoke fire where black smoke is produced by combustion.

[0082] In this embodiment, the receiver 10 shown in Figure 1 collects the first and second smoke detection values ​​A1 and A2 detected by the photoelectric smoke detector 14 that triggered the fire alarm. The fire alarm control unit 48 calculates the ratio R = A1 / A2 of the first and second smoke detection values ​​A1 and A2. If R ≥ 5, it is determined to be a white smoke fire where white smoke is generated by smoldering, and if R < 5, it is determined to be a black smoke fire where black smoke is generated by combustion.

[0083] Furthermore, the fire alarm control unit 48 of the receiver 10 determines that there is a white smoke fire based on the first and second smoke detection values ​​A1 and A2, and if the first smoke detection value A1 is equal to or greater than the fire alarm threshold A1th corresponding to a smoke concentration of 10% / m for the second sensitivity, it determines that there is a confirmed fire and performs control to output a fire alarm that includes information indicating a white smoke fire.

[0084] Similarly, the fire alarm control unit 48 of the receiver 10 determines that there is a black smoke fire based on the first and second smoke detection values ​​A1 and A2. If the second smoke detection value A2 is equal to or greater than the fire alarm threshold A2th corresponding to a smoke concentration of 10% / m for two types of sensitivity, it determines that there is a confirmed fire and performs control to output a fire alarm that includes information indicating a black smoke fire.

[0085] (Identification of non-fire factors) In the smoke detection section 60 of the photoelectric smoke detector 14 shown in Figure 4, if steam from a bathroom or the like flows in as a non-fire source, the ratio R of the first and second smoke detection values ​​A1 and A2 will show a large value, for example, R=10.

[0086] Therefore, to identify steam, a non-fire factor threshold RSth is set, for example, to RSth=12, and if R≧12, it is identified as a non-fire factor such as steam.

[0087] The fire alarm control unit 48 of the receiver 10 also determines non-fire factors based on the ratio R of the first and second smoke detection values ​​A1 and A2. If R ≥ 12, it is determined that the factor is a non-fire factor such as steam, and alarm control is performed based on the entry / exit detection signal obtained from the entry / exit management system 100.

[0088] Specifically, the fire alarm control unit 48 determines non-fire factors based on the ratio R of smoke detection values ​​A1 and A2. When it determines the presence of an occupant based on the entry / exit detection signal, it holds off on outputting a warning alarm indicating a non-fire factor. On the other hand, when it determines that there is a non-fire factor and no occupant, it outputs a warning alarm indicating a non-fire factor.

[0089] Therefore, if a non-fire alarm is detected due to steam or cooking smoke from a bathroom, etc., and there are occupants present, the alarm is deemed unnecessary and held in abeyance, as it is considered to be steam or cooking smoke from the occupants using the bathroom. On the other hand, if no occupants are present when a non-fire cause is identified, the situation is such that steam or cooking smoke from the bathroom, etc., is left unattended, and an alarm is issued to allow for necessary action.

[0090] Furthermore, in this embodiment, a sensor is provided as a means for detecting people, which detects the operation of switches on appliances such as home appliances, water heaters, and lighting in the protected area. When this sensor detects the operation of a switch on an appliance, it transmits an occupancy detection signal to the receiver indicating whether or not a person is present.

[0091] Therefore, the fire alarm control unit 48 uses a motion sensor to detect the operation of switches for water heaters and lights in the bathroom, switches for cooking appliances such as gas ranges, and switches for home appliances such as televisions and air conditioners. Since it is assumed that people are in the room when these are operating and that there is a possibility of non-fire factors being generated, the fire alarm control unit 48 determines non-fire factors based on the ratio R of smoke detection values ​​A1 and A2. The receiver does not output a warning alarm indicating a non-fire factor and puts it on hold, while simultaneously outputting a warning alarm indicating a non-fire factor to an information display device (not shown) in the room.

[0092] [Fire monitoring and control of fire alarm systems] Figure 6 is a flowchart showing the control operation in the receiver shown in Figure 1, and represents the control operation by the transmission control unit 46 and the fire alarm control unit 48 shown in Figure 1. Figure 7 is a flowchart showing the control operation in the photoelectric smoke detector, and represents the control operation by the detector control unit 50. Furthermore, the control in Figures 6 and 7 is characterized by the receiver 10 identifying white smoke fire, black smoke fire, or non-fire cause.

[0093] (Control of the receiver) As shown in Figure 6, in step S1, the transmission control unit 46 of the receiver 10 sends a broadcast batch AD conversion signal to the signal line 12-1 at predetermined intervals, specifying all photoelectric smoke detectors 14. The smoke detection values ​​A1 and A2, which are analog signals detected by the photoelectric smoke detectors 14, are converted to digital signals via AD conversion and stored. Subsequently, the unit sends call signals specifying the addresses of the photoelectric smoke detectors 14 in sequence. The unit receives call response signals transmitted by the photoelectric smoke detectors 14 that have received the call signals and performs call response control to monitor whether the photoelectric smoke detectors 14 are operating normally.

[0094] Next, when the transmission control unit 46 determines that it has received a fire interrupt signal from the photoelectric smoke detector 14 that triggered the fire alarm in step S2, it proceeds to step S3 and searches for the address of the photoelectric smoke detector 14 that triggered the fire alarm and sent the fire interrupt signal by transmitting a group search command signal and an in-group search command signal.

[0095] Next, the transmission control unit 46 proceeds to step S4, shortens the period of the batch AD conversion signal, and sends a call signal specifying the address of the photoelectric smoke detector 14 that sent the fire interrupt signal. This repeatedly acquires the first and second smoke detection values ​​A1 and A2 from the photoelectric smoke detector 14 that has triggered a fire alarm and transmits them to the fire alarm control unit 48 of the main CPU 26.

[0096] In step S5, the fire alarm control unit 48 calculates the ratio R = A1 / A2 of the first and second smoke detection values ​​A1 and A2. In step S6, it compares this ratio with a preset ratio threshold Rth = 5 based on Figure 5. If R ≥ 5, it proceeds to step S7 to determine it is a white smoke fire. If R < 5, it proceeds to step S12 to determine it is a black smoke fire. The fire alarm control unit 48 also determines that if the ratio R is greater than or equal to the non-fire factor threshold RSth = 12, it is a non-fire factor caused by steam, but this is not shown in the diagram.

[0097] Next, if the fire alarm control unit 48 determines in step S6 that the ratio R is equal to or greater than the ratio threshold Rth = 5, it proceeds to step S8, where it obtains occupancy information from the access control system 100. If it determines in step S9 that there is an occupant, it determines that there is some non-fire factor due to the presence of an occupant, and outputs a caution alarm instead of a fire alarm, and repeats the monitoring process from step S1.

[0098] On the other hand, if the fire control unit 48 determines in step S9 that there are no occupants, it proceeds to step S10. If it determines that the first smoke detection value A1 is equal to or greater than the fire alarm threshold A1th, it determines that a fire has been confirmed and proceeds to step S11. Since a white smoke fire has been detected and the absence of occupants has been determined, it outputs a fire alarm indicating a white smoke fire and performs interlocking control corresponding to the white smoke fire.

[0099] On the other hand, if the fire alarm control unit 48 determines in step S6 that the ratio R is less than the ratio threshold Rth = 5, it proceeds to step S12 to determine that there is a black smoke fire. Then it proceeds to step S13, and if it determines that the second smoke detection value A2 is greater than or equal to the fire alarm threshold A2th, it determines that there is a confirmed fire and proceeds to step S14, where, since a black smoke fire has been determined, it outputs a fire alarm indicating a black smoke fire regardless of whether there are people in the room, and performs interlocking control corresponding to the black smoke fire.

[0100] Next, the fire alarm control unit 48 repeats the process from step S1 until it determines in step S15 that the fire has been restored. Once it determines that the fire has been restored, it sends a fire restoration signal to the photoelectric smoke detector 14 in step S16 to restore it, then returns to step S1 and repeats the control from step S1.

[0101] (Control of photoelectric smoke detectors) As shown in Figure 7, the detector control unit 50 of the photoelectric smoke detector 14 shown in Figure 2, upon determining in step S21 that it has received a batch AD conversion signal from the receiver 10, proceeds to step S22. There, by driving the light-emitting element 62 to emit light, it detects smoke detection value A1 detected by receiving light of the first wavelength λ1 and scattered light at the first scattering angle θ1, and smoke detection value A2 detected by receiving light of the second wavelength λ2 and scattered light at the second scattering angle θ2, and stores these in memory in step S23.

[0102] Next, when the sensor control unit 50 determines in step S24 that it has received a call signal specifying its own address, it proceeds to step S25 and transmits a call response signal indicating the sensor status, informing the receiver 10 of its own status.

[0103] Next, the sensor control unit 50 proceeds to step S26, and when it determines that the first smoke detection value A1 is equal to or greater than the warning threshold AP1th = 5% / m corresponding to the two sensitivity levels, a fire alarm is triggered. The unit then proceeds to step S27, where it sends a fire interrupt signal to the receiver 10. Subsequently, when it determines in step S28 that it has received the group search command and the in-group search command sent from the receiver 10, it proceeds to step S29, where it sends a search response signal indicating a fire alarm, causing the receiver 10 to obtain the address of the photoelectric smoke detector 14 that triggered the fire alarm.

[0104] Next, the receiver 10 transmits a batch AD conversion signal followed by a call signal specifying the fire alarm address at short intervals. In step S30, the detector control unit 50 determines that it has received the batch AD conversion signal and the call signal and proceeds to step S31. There, it detects the first and second smoke detection values ​​A1 and A2 by driving the light-emitting element 62 to light up and stores them in memory. In step S32, it transmits a call response signal including the smoke detection values ​​A1 and A2 to the receiver 10. The receiver 10 then determines the ratio R of the smoke detection values ​​A1 and A2, identifies whether it is a white smoke fire or a black smoke fire, and performs fire alarm control based on whether or not there are occupants.

[0105] Next, the sensor control unit 50 repeats the process from step S30 until it determines in step S33 that it has received a fire recovery signal from the receiver 10. Once it determines that it has received a fire recovery signal, it returns to step S1 and repeats the same control operation.

[0106] In the control shown in Figures 6 and 7, the receiver 10 distinguishes between white smoke fires and black smoke fires. However, the photoelectric smoke detector 14 may also distinguish between white smoke fires and black smoke fires, transmit a fire signal containing identification information for either a white smoke fire or a black smoke fire to the receiver 10, and perform fire detection and fire alarm control in combination with the presence or absence of occupants by the access control system 100.

[0107] [Fire alarm system combined with motion sensors] Figure 8 is an explanatory diagram showing an embodiment of a fire alarm system combined with a motion sensor. As shown in Figure 8, in this embodiment, a motion sensor 80, which functions as a human detection means, is connected to a signal line 12-1 drawn out from a receiver 10 via a repeater 16. The motion sensor 80 receives infrared energy emitted from the human body using a pyroelectric element or the like, and outputs a human detection signal indicating the presence or absence of a person.

[0108] When the repeater 16 connected to the motion sensor 80 receives a batch AD conversion signal transmitted from the receiver 10, it samples the human detection signal output by the motion sensor 80 and stores the human detection information. Subsequently, when it receives a call signal from the receiver 10 specifying the address of the repeater 16 connected to the motion sensor 80, it transmits a call response signal to the receiver 10 that includes the human detection information it has stored at that time.

[0109] The motion sensor 80 is installed in a protected area such as a room where a photoelectric smoke detector 14 is installed. For example, the motion sensor 80 is installed together with the photoelectric smoke detector 14 in protected areas such as kitchens, smoking rooms, and bathrooms where non-fire-causing factors are expected to occur.

[0110] The fire alarm control unit 48, located on the main CPU 26 of the receiver 10, performs fire determination and alarm control specific to this embodiment by combining the human detection information from the human presence sensor 80 with the identification results of white smoke fires and black smoke fires based on the photoelectric smoke detector 14.

[0111] In other words, the fire alarm control unit 48 determines that a white smoke fire is occurring when the ratio R of the smoke detection values ​​A1 and A2 detected by the photoelectric smoke detector 14 is equal to or greater than the ratio threshold Rth = 5. Furthermore, when it determines that the presence of a person has been detected by the motion sensor 80, it can conclude that some non-fire factor is present, and therefore controls the unit to output a warning alarm instead of a fire alarm.

[0112] Furthermore, the fire alarm control unit 48 determines whether it is a white smoke fire based on the ratio R of smoke detection values ​​A1 and A2, and when it also determines that there is no human presence using the human presence sensor 80, it determines that it is a white smoke fire in which white smoke is slowly increasing due to smoldering, and controls the system to output a fire alarm indicating a white smoke fire.

[0113] On the other hand, when the fire alarm control unit 48 of the main CPU 26 determines that a black smoke fire has occurred because the ratio R of smoke detection values ​​A1 and A2 is below the ratio threshold Rth=5, it determines that the fire is highly dangerous due to the generation of black smoke caused by a rapidly expanding combustion fire. Therefore, it controls the system to output a fire alarm indicating a black smoke fire, regardless of whether or not there are people present.

[0114] In this embodiment, by installing the motion sensor 80 together with the photoelectric smoke detector 14 in places where non-fire factors are likely to occur, such as smoking rooms and kitchens, for example, if white smoke and the presence of a person are detected in a smoking room, it is determined to be cigarette smoke, so a warning alarm is output instead of a fire alarm, and fire monitoring continues. Furthermore, if white smoke is detected but no person is present, it is determined that a cigarette has not been extinguished and is smoldering, and a fire alarm indicating a white smoke fire is output. In addition, if a black smoke fire is detected, a fire alarm indicating a black smoke fire is output regardless of the presence of a person, as there is an imminent danger due to the combustion fire, enabling rapid evacuation.

[0115] Furthermore, the fire alarm control unit 48 determines a non-fire factor when the ratio R of smoke detection values ​​A1 and A2 is greater than or equal to the non-fire factor threshold RSth = 12, and when it also determines the presence of a person detected by the human presence sensor 80, it refrains from outputting a warning alarm indicating a non-fire factor. However, if the non-fire factor is not resolved after a predetermined time has elapsed, the fire alarm control unit 48 may release the suspension of the warning alarm output and output a warning alarm indicating a non-fire factor.

[0116] On the other hand, the fire alarm control unit 48 determines non-fire factors based on the ratio R of smoke detection values ​​A1 and A2, and when it determines that there are no people present using the human presence sensor 80, it performs control to output a warning alarm indicating a non-fire factor.

[0117] If a person is present when a non-fire factor is identified, it is determined that a warning or alert is unnecessary and the alert is withheld. On the other hand, if no person is present when a non-fire factor is identified, it means that a non-fire factor such as steam from a bathroom or cooking smoke is left unattended, so a warning or alert is issued to enable necessary action.

[0118] The configuration and functions of the fire alarm system 1 are the same as those in the embodiment shown in Figure 1, and therefore the same reference numerals are used, and their descriptions are omitted.

[0119] [Fire alarm system combined with security system] Figure 9 is an explanatory diagram showing an embodiment of a fire alarm system combined with a security system. As shown in Figure 9, the fire alarm system 1 of this embodiment is basically the same as the embodiment in Figure 1, and is characterized by the combination of a security system 200 that functions as a means for detecting people.

[0120] The security system 200 connects a security sensor 206 to a signal line 204 drawn from the security receiver panel 202. The security sensor 206 detects the intrusion of an intruder into the protected area and transmits a security detection signal indicating the presence or absence of an intruder to the security receiver panel 202 via the signal line 204, causing the system to output a theft alarm. The security sensor 206 can be a sensor that detects infrared energy emitted by an intruder or a sensor that detects when a window is open, etc.

[0121] The security receiver panel 202 is connected to a communication adapter 45 located on the receiver 10 of the fire alarm system 1 via a communication adapter 208. The fire alarm control unit 48 located on the main CPU 26 of the receiver 10 can communicate with the security system 200 via the communication adapters 45 and 208 to acquire security monitoring information indicating the presence or absence of intruders detected by the security sensor 206.

[0122] The fire alarm control unit 48, located in the main CPU 26 of the receiver 10, performs fire determination and alarm control specific to this embodiment by combining security monitoring information indicating the presence or absence of intruders from the security system 200 with the identification results of white smoke fires and black smoke fires based on the photoelectric smoke detector 14.

[0123] Specifically, the fire alarm control unit 48 determines that a white smoke fire is occurring when the ratio R of the smoke detection values ​​A1 and A2 detected by the photoelectric smoke detector 14 is equal to or greater than the ratio threshold Rth = 5. Furthermore, when the presence of an intruder is detected by the security system 200, it can determine that there is a high probability that the white smoke is being generated by arson committed by the intruder, and therefore controls the unit to output a fire alarm indicating a white smoke fire.

[0124] On the other hand, when the fire alarm control unit 48 of the main CPU 26 determines that a black smoke fire has occurred because the ratio R of smoke detection values ​​A1 and A2 is below the ratio threshold Rth=5, it determines that the fire is highly dangerous due to the rapidly expanding combustion fire generating black smoke. Therefore, it controls the system to output a fire alarm indicating a black smoke fire, regardless of whether or not an intruder is present.

[0125] Furthermore, the fire alarm control unit 48 determines that a non-fire factor is present when the ratio R of smoke detection values ​​A1 and A2 is greater than or equal to the non-fire factor threshold RSth = 12, and when it also determines that there is no intruder detected by the security system 200, it performs control to hold off on outputting a warning alarm indicating a non-fire factor.

[0126] Furthermore, if the non-fire factor is not resolved after a predetermined time has elapsed, the fire control unit 48 may release the suspension of the warning alarm output and output a warning alarm indicating the non-fire factor.

[0127] The configuration and functions of the fire alarm system 1 are the same as those in the embodiment shown in Figure 1, and therefore the same reference numerals are used, and their descriptions are omitted.

[0128] [Modified version of the present invention] (Photoelectric smoke detector) The above embodiment takes as an example a photoelectric smoke detector with a smoke detection unit structure comprising one light-emitting element and two light-receiving elements, as shown in Figure 4. However, it is not limited to this, and any photoelectric smoke detector with a smoke detection unit structure capable of obtaining first and second smoke detection values ​​A1 and A2 by setting different wavelengths and scattering angles is acceptable. For example, it could be the photoelectric smoke detector with a smoke detection unit structure comprising two light-emitting elements and one light-receiving element as shown in Patent Document 2.

[0129] Furthermore, in the above embodiment, the photoelectric smoke detector detects the first and second smoke detection values ​​A1 and A2 by driving the light-emitting element to emit light when it receives a batch AD conversion signal from the receiver. However, the photoelectric smoke detector may also detect the first and second smoke detection values ​​A1 and A2 by intermittently driving the light-emitting element to emit light at a predetermined period, without being instructed by the receiver.

[0130] (Type P fire alarm system) The above embodiment uses an R-type fire alarm system as an example, which monitors fires by sending and receiving signals between a receiver and a photoelectric smoke detector with a set address. However, it may also be a P-type fire alarm system that, upon activation by a photoelectric smoke detector, transmits a white smoke fire signal, a black smoke fire signal, or a non-fire cause signal to the receiver without receiving instructions from the receiver, thereby outputting a white smoke fire alarm, a black smoke fire alarm, or a non-fire alarm warning.

[0131] In such a Type P fire alarm system, a photoelectric smoke detector sends an alarm current to the signal line from the receiver, transmitting a white smoke fire signal, a black smoke fire signal, or a non-fire-related signal to the receiver. To distinguish between the white smoke fire signal, black smoke fire signal, or non-fire-related signal, a unique frequency signal or pulse code signal is superimposed on the alarm current, allowing the receiver to identify the signal and output a white smoke fire alarm, a black smoke fire alarm, or a non-fire-related warning alarm.

[0132] Furthermore, the interlocking control of control devices such as district sounders, exhaust systems, and fire extinguishing systems in a Type P fire alarm system is performed on a circuit-by-circuit basis using Type P interlocking control.

[0133] (Determination of non-fire factors) In the above embodiment, in addition to determining whether there is white smoke or black smoke, a non-fire factor is also determined. However, it is also possible to omit the determination of non-fire factors and only determine whether there is white smoke or black smoke.

[0134] (Fire alarm system) The above embodiment uses a wired system in which a photoelectric smoke detector is connected to a signal line from a receiver as an example, but a wireless system in which the receiver and the photoelectric smoke detector are connected by a wireless line may also be used.

[0135] (comparative judgment) In the above-described embodiment, for example, as the comparison of the magnitude between the ratio R and the ratio threshold value Rth, the cases of R≧Rth and R<Rth are shown, but this is not limiting, and the comparison of the magnitude between the cases of R>Rth and R≦Rth may also be used. The same applies to the comparison of the magnitude of other values.

[0136] (Others) Further, the present invention includes appropriate modifications that do not impair its object and advantages, and furthermore, is not limited by the numerical values shown in the above-described embodiment.

Explanation of Reference Numerals

[0137] 1: Fire alarm equipment 10: Receiver 12, 12-1 to 12-3: Signal lines 14: Photoelectric smoke detector 16: Repeater 18: Area sound device 20: Exhaust device 22: Fire door 26: Main CPU 28-1 to 28-3: Sub CPU boards 30: Sub CPU 32: Transmission unit 34: Serial transfer bus 36: Display 38: Display unit 40: Operation unit 42: Acoustic alarm unit 44: Transfer reporting unit 45, 114, 208: Communication adapter 46: Transmission control unit 48: Fire alarm control unit 50: Sensor control unit 52: Transmission unit 54: Power supply unit 56: Light emission drive unit 60: Smoke detection unit 62: Light emitting element 62a, 64a, 66a: Optical axes 64: First light receiving element 66: Second light receiving element 68, 70: Amplification circuit unit 80: Human presence sensor 100: Access Control System 102: Center Equipment 104: Client 106: LAN connection 108: Local control panel 110: Card reader 112: Electric lock 200: Security System 202: Security Receiver Panel 206: Security Sensor

Claims

[Claim 1] A fire alarm system that monitors and alerts to fires in a restricted area, A fire detector that transmits a fire signal including identification information of fires and non-fire factors in the aforementioned restricted area, A person detection means that detects the presence or absence of people in the aforementioned restricted area and transmits a detection signal, A fire alarm control unit that determines whether a fire is a fire or a non-fire cause based on the fire signal from the fire detector, Equipped with, The aforementioned fire alarm control unit, After identifying the non-fire factor, if the presence of a person in the protected area is determined based on the detection signal, the output of a warning alert indicating the occurrence of the non-fire factor is withheld. A fire alarm system characterized in that, after identifying the non-fire factor, it outputs a warning alarm indicating the occurrence of the non-fire factor when it determines, based on the detection signal, that there are no people in the protected area.

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