JP5469412B2 - Fire alarm system - Google Patents

Description

  The present invention relates to a fire alarm system in which a plurality of fire alarm devices transmit and receive radio signals using radio waves as a medium.

  Conventionally, it has been obligatory to install fire alarms in houses to reduce the number of victims of house fires, and multiple fire alarms are linked using wireless signals from the viewpoint of workability in existing houses. A fire alarm system is provided. Such a fire alarm system has a function in which a plurality of fire alarms installed in multiple locations each detect a fire and a function that sounds an alarm sound. When detected, the fire alarm sounds an alarm sound and transmits information notifying the fire detection to other fire alarms by wireless signals, so that not only the fire source fire alarm but also multiple fire alarms By sounding the alarm sound all together, it is possible to quickly and reliably notify the occurrence of a fire.

  As one of the above-mentioned fire alarm systems, so-called multi-hop communication is performed in which each fire alarm relays a message received by wireless communication from other fire alarms other than itself to another fire alarm. Some fire alarms that do not reach radio waves can be linked together. However, each fire alarm needs to be in a state where wireless communication is possible with at least one of the other fire alarms other than itself.

  In such a fire alarm system that relays radio signals, multiple fire alarms may relay and transmit at the same time, which may interfere with each other's radio waves and prevent normal communication between the fire alarms. It was. A fire alarm system that solves this problem is disclosed in Patent Document 1, for example. In the conventional example described in Patent Document 1, the relay delay time is calculated based on the product of the registration number individually assigned to each fire alarm and a predetermined unit time, and when the interlock control signal is received. The interlock alarm is started, and relay transmission is performed after the relay delay time calculated for the received interlock control signal has elapsed. Thus, since the interlock control signals are relayed and transmitted from the respective fire alarm devices after elapse of different relay delay times, it is possible to prevent the mutual radio waves from interfering with each other.

JP 2008-009480 A

  However, in the above conventional example, since each fire alarm performs relay transmission after the relay delay time elapses, the time required to transmit a radio signal to all the fire alarms is extra for the relay delay time. End up. For this reason, there was a problem that not all fire alarms could be notified of the occurrence of a fire quickly.

  The present invention has been made in view of the above points, and can prevent the occurrence of radio wave interference between the fire alarms and can promptly notify all fire alarms of the occurrence of a fire. The purpose is to provide a system.

In order to achieve the above object, the invention of claim 1 includes a plurality of fire alarms that transmit and receive radio signals using radio waves as media, and each fire alarm includes a fire detection unit that detects a fire, and a fire alarm. A fire for notifying the fire alarm to the fire alarm when the fire sensor detects a fire, and to notify the fire alarm to another fire alarm A control unit that causes an alarm message to be transmitted from a wireless transmission / reception unit, receives a radio signal transmitted from another fire alarm and receives a fire alarm message, and notifies a fire alarm to a notification unit, and a predetermined operation input. And a repeater setting unit that sets itself as a repeater when received, and the control unit of the fire alarm set in the repeater receives a radio signal transmitted from any of the fire alarms by the wireless transmission / reception unit The radio signal to transmit from the radio transceiver to another fire alarm relays a radio signal, the control unit of the fire alarm a radio signal transmitted from one of the fire alarm at the wireless transceiver When receiving, a response message notifying that the radio signal has been received is returned from the radio transmission / reception unit to the fire alarm device that transmitted the radio signal, and each repeater setting unit of any two or more fire alarm devices When a predetermined operation input is received, any one of the fire alarms is set as a transmission source, and another fire alarm is set as a transmission destination and a repeater, and the fire alarm set as the transmission source is set. The control unit causes the wireless signal to be transmitted only to the fire alarm set as the transmission destination from the wireless transmission / reception unit .

According to the invention of claim 1, since only any fire alarm can be set as a repeater among a plurality of fire alarms, it is compared with a case where all fire alarms have a function of relaying radio signals. Thus, it is possible to prevent radio wave interference between the fire alarms. In addition, since fire alarms set as repeaters perform relay transmission when a radio signal is received, all fire alarms are compared to the case where each fire alarm relays a wireless signal after the relay delay time has elapsed. The time required to transmit a radio signal to the device can be shortened. Therefore, it is possible to promptly notify all fire alarms of the occurrence of a fire . According to the invention of claim 1, since the fire alarm set as the transmission source transmits a radio signal only to the fire alarm set as the transmission destination, only from the fire alarm set as the transmission destination. A response message is transmitted, and it is possible to make the response messages less likely to interfere with each other as compared with a case where a fire alarm set as a transmission source transmits a wireless signal by multicast. In addition, to prevent a fire alarm that is not set as the transmission destination from transmitting the same radio signal from either the fire alarm set as the transmission source or the fire alarm set as the repeater Therefore, it is not necessary to return a response message to each, and wasteful power consumption can be prevented .

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of the fire alarm system which concerns on this invention, (a) is a block diagram of a fire alarm device, (b) is a system schematic. It is a frame format of the radio signal in the same as above. It is a figure which shows Embodiment 2 of the fire alarm system which concerns on this invention, (a) is a system schematic diagram which shows the case where there is one transmission source, (b) is a system schematic diagram which shows the case where there are a plurality of transmission sources. .

(Embodiment 1)
Hereinafter, a fire alarm system according to a first embodiment of the present invention will be described with reference to the drawings. However, in the following description, when the fire alarm devices TR1 to TR8 are collectively shown, they are expressed as the fire alarm device TR. As shown in FIG. 1 (b), the present embodiment includes a plurality (eight in this embodiment) of fire alarm devices TR1 to TR8, and wireless communication using radio waves as a medium between the plurality of fire alarm devices TR. A signal is transmitted.

  As shown in FIG. 1A, the fire alarm TR transmits a radio signal using radio waves as a medium via the antenna 3 and receives a radio signal transmitted by another fire alarm TR via the antenna 3. Wireless transmission / reception unit 2 that detects fire, fire detection unit 4 that detects a fire, notification unit 5 that notifies a user by sounding an alarm sound in the event of a fire or abnormality, a microcomputer or a rewritable nonvolatile memory (For example, EEPROM etc.) as a main component, when the fire detection unit 4 detects a fire, the alarm unit 5 sounds an alarm sound and also fires other fire alarms TR to notify the fire alarm A control unit 1 that transmits an alarm message from the wireless transmission / reception unit 2, a repeater setting unit 6 that sets itself as a repeater when a predetermined operation input is received, and supplies operation power to each unit using a battery such as a dry battery as a power source And it includes a power supply unit 7 that. A unique identification code is assigned to each of the fire alarm devices TR1 to TR8, and the transmission destination of the radio signal and the fire alarm device TR of the transmission source can be specified by the identification code.

  The radio transmission / reception unit 2 transmits / receives a radio signal using radio waves as a medium in accordance with “radio station of low power security system” defined in Article 6, Paragraph 4, Item 3 of the Radio Law Enforcement Regulations. In addition, the fire detection unit 4 detects fire by detecting smoke, heat, flames, and the like generated with a fire, for example. In addition, since the radio | wireless transmission / reception part 2 and the fire detection part 4 are conventionally well-known, detailed description is abbreviate | omitted here.

  The control part 1 implement | achieves the various functions mentioned later by running the program stored in memory with a microcomputer. When the fire detection unit 4 detects the occurrence of a fire, the control unit 1 drives a buzzer included in the notification unit 5 to sound an alarm sound, or an alarm voice message (for example, stored in a memory or the like in advance) The fire alarm message is transmitted from the wireless transmission / reception unit 2 in order to notify the fire alarm in the other fire alarm devices TR. Even when the wireless transmission / reception unit 2 receives a wireless signal transmitted from another fire alarm device TR, the control unit 1 controls the notification unit 5 to sound an alarm sound.

  The repeater setting unit 6 includes switches such as a push button and a dip switch, for example, and causes the control unit 1 to perform an operation of setting itself as a repeater when a predetermined operation input such as a push operation or a slide operation is received. When the control unit 1 of the fire alarm device TR set in the repeater receives a radio signal such as a fire alarm message from another fire alarm device TR, the control unit 1 transmits the radio signal from the radio transceiver unit 2 to the other fire alarm device TR. To transmit the radio signal.

  FIG. 2 shows a frame format of a radio signal transmitted and received by the fire alarm device TR. A synchronization bit (preamble: PA), a frame synchronization pattern (unique word: UW), a destination address DA, a source address SA, a message M, One frame is composed of a CRC code. Here, if the identification code of each fire alarm device TR is set as the destination address DA, only the fire alarm device TR of the identification code receives a radio signal and acquires a message. By setting a special bit sequence that is not assigned to the fire alarm device TR (for example, a bit sequence in which all bits are set to 1), all the fire alarm devices TR that are within the communication range by transmitting wireless signals by multicast Can get messages.

  Hereinafter, relay transmission of a radio signal according to the present embodiment will be described with reference to FIG. In FIG.1 (b), the arrow is filled in between the two fire alarms TR which can mutually communicate wirelessly, and wireless communication cannot be performed between the fire alarms TR without the arrow. Is shown. That is, only four fire alarm devices TR1, TR3, TR4, and TR5 can be directly wirelessly communicated with the fire alarm device TR2, and the fire alarm devices TR2, TR6, TR7, and the like can be directly wirelessly communicated with the fire alarm device TR5. There are only four units of TR8, and only one unit of the fire alarm device TR2 can directly wirelessly communicate with the fire alarm device TR4.

  Therefore, in the case of the fire alarm system shown in FIG. 1B, all the fire alarms can be obtained by performing predetermined operation inputs at the repeater setting unit 6 of the fire alarm devices TR2 and TR5 and setting the repeaters. Wireless communication is possible in the devices TR1 to TR8. For example, when a fire is detected by the fire alarm device TR4, a fire alarm message is transmitted from the fire alarm device TR4 by multicast, and only the fire alarm device TR2 capable of wireless communication with the fire alarm device TR4 receives the fire alarm message. . Then, the fire alarm device TR2 set in the relay device relays the fire alarm message and transmits it by multicast, so that the three fire alarm devices TR1, TR3, TR5 receive the fire alarm message. Furthermore, when the fire alarm device TR5 set as the repeater transmits the fire alarm message by multicast, the three fire alarm devices TR6, TR7, and TR8 receive the fire alarm message. Thus, when the fire alarm message is delivered to all the fire alarm devices TR1 to TR8, not only the fire alarm device TR4 that senses the fire but also the fire alarm devices TR1 to TR3, TR5 to TR8 other than the fire source. All the fire alarm devices TR1 to TR8 included can be linked to notify a fire alarm.

  As described above, since only an arbitrary fire alarm device TR can be set as a repeater among a plurality of fire alarm devices TR, compared with a case where all the fire alarm devices TR have a function of relaying a radio signal. Thus, it is possible to prevent radio wave interference between the fire alarm devices TR. In addition, since the fire alarm device TR set in the repeater performs relay transmission when a radio signal is received, all the fire alarm devices TR transmit all radio signals after the relay delay time elapses. The time required to transmit a radio signal to the fire alarm device TR can be shortened. Therefore, it is possible to promptly notify all fire alarms TR of the occurrence of a fire.

  Here, all fire alarms TR have a function of relaying radio signals, and relays are performed by the control unit 1 of each fire alarm TR so that radio interference does not occur between the fire alarms TR during relay transmission. A configuration for controlling to automatically set the route is also conceivable. However, in this case, there is a problem that the manufacturing cost increases because the control unit 1 has a function of automatically setting a relay route. On the other hand, in the present embodiment, since the repeater is only manually set, it is only necessary to provide the repeater setting unit 6, and the manufacturing cost can be reduced.

  In addition, it is desirable that the fire alarm device TR set in the repeater can cancel the setting of the repeater by receiving a predetermined operation input. For example, if the repeater setting unit 6 includes a push button, the setting of the repeater of the fire alarm device TR may be canceled by pressing the push button for a predetermined time (for example, several seconds). In addition, in the fire alarm device TR set in the relay device, a light emitting unit (not shown) made of a light emitting element such as a light emitting diode is changed to a light emission color different from that of other fire alarm devices TR, or other fires. If the flashing pattern is changed to a different flashing pattern from that of the alarm device TR, it is desirable that the user can easily visually recognize the fire alarm device TR set in the relay device.

(Embodiment 2)
Hereinafter, Embodiment 2 of the fire alarm system according to the present invention will be described with reference to the drawings. Since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted.

  In a general fire alarm system, the radio signal is received from the fire alarm device TR that has received the radio signal to the fire alarm device TR that has transmitted the radio signal in consideration of the case where the radio signal cannot be transmitted due to noise or the like. A response message informing that is sent back. Here, in the first embodiment, the fire alarm device TR that has detected a fire is configured to transmit the fire alarm message by multicast. However, when a large number of fire alarm devices TR receive the fire alarm message, these fire alarm devices TR There is a possibility that the response messages returned by the fire alarm device TR may interfere with each other and cannot communicate normally. In addition, there may be a fire alarm TR that transmits a fire alarm message from both the fire alarm TR that has detected a fire and the fire alarm TR that is set in the repeater. The device TR must return a response message to each of them, and there is a possibility that power is wasted.

  Therefore, in the present embodiment, when a predetermined operation input is received in each repeater setting unit 6 of any two or more fire alarm devices TR, one of the fire alarm devices TR is set as a transmission source, The other fire alarm device TR is set as the transmission destination and the relay device, and the control unit 1 of the fire alarm device TR set as the transmission source is wirelessly transmitted only from the wireless transmission / reception unit 2 to the fire alarm device TR set as the transmission destination. A signal is transmitted.

  For example, as shown in FIG. 3 (a), when the repeater setting unit 6 is composed of push buttons, within a certain time (for example, 5 minutes) after the repeater setting unit 6 of the fire alarm device TR1 is pressed. When the repeater setting units 6 of the fire alarm devices TR2 and TR3 are sequentially pressed, the fire alarm device TR1 is set as the transmission source, and the fire alarm devices TR2 and TR3 are set as the transmission destination and the relay device. In this case, when a fire is detected by the fire alarm device TR1, the fire alarm device TR1 transmits a fire alarm message only to the fire alarm devices TR2 and TR3, not by multicast.

  As described above, since the fire alarm device TR set as the transmission source transmits a radio signal only to the fire alarm device TR set as the transmission destination, a response message is received only from the fire alarm device TR set as the transmission destination. The response messages can be made less likely to interfere with each other as compared with the case where the fire alarm device TR transmitted and set as the transmission source transmits the radio signal by multicast. Further, in the fire alarm device TR that is not set as the transmission destination, the same radio signal (for example, fire alarm) is transmitted from both the fire alarm device TR set as the transmission source and the fire alarm device TR set as the relay device. Message) can be prevented from being transmitted, so that it is not necessary to return a response message to each, and power consumption can be prevented from being wasted.

  As described above, after the fire alarm device TR1 is set as the transmission source and the fire alarm devices TR2 and TR3 are set as the transmission destination and the relay device, that is, after the predetermined time has elapsed, the fire alarm devices TR2 and TR4 are further relayed in this order. It is possible to set the fire alarm device TR2 as a transmission source and to set the fire alarm device TR4 as a transmission destination and a repeater by pushing the alarm setting unit 6 within a certain time (FIG. 3B). )reference). In this way, by sequentially operating the repeater setting unit 6 of each fire alarm device TR according to a predetermined condition, it is possible to set a transmission source, a transmission destination, and a repeater for a plurality of fire alarm devices TR. .

DESCRIPTION OF SYMBOLS 1 Control part 2 Wireless transmission / reception part 4 Fire detection part 5 Notification part 6 Repeater setting part TR1-TR8 Fire alarm

Claims (1)

Provided with a plurality of fire alarms that transmit and receive radio signals using radio waves as a medium, each fire alarm includes a fire detection unit that detects a fire, a notification unit that notifies a fire alarm, and a radio transmission and reception unit that transmits and receives a radio signal When a fire is detected by the fire detection unit, the notification unit notifies the fire alarm and the other fire alarm device transmits a fire alarm message from the wireless transmission / reception unit, and other fire alarms. A control unit that notifies a fire alarm to a notification unit when a fire alarm message is received by receiving a radio signal transmitted from the device, and a repeater setting unit that sets itself as a repeater when a predetermined operation input is received. When the control unit of the fire alarm set in the repeater receives a wireless signal transmitted from any of the fire alarms by the wireless transmission / reception unit, the wireless signal is transmitted from the wireless transmission / reception unit to another fire alarm. By sending to the relay radio signals,
When the control unit of each fire alarm receives a wireless signal transmitted from any of the fire alarms, the wireless transmitter / receiver transmits a response message notifying that the wireless signal has been received from the wireless transmitter / receiver. When a predetermined operation input is received at each repeater setting unit of any two or more fire alarm devices, any one of the fire alarm devices is set as a transmission source. At the same time, another fire alarm is set as the transmission destination and repeater, and the control unit of the fire alarm set as the transmission source transmits a radio signal only to the fire alarm set as the transmission destination from the wireless transmission / reception unit fire alarm system characterized in that it makes.

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