JP2005339032A - Residential fire alarm system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire alarm system that can give an alarm output as an intrinsic function while dispensing with a circuit in each fire alarm for generating self-driving power from commercial power supply and simplifying wiring for connecting each fire alarm. <P>SOLUTION: The fire alarms are at least one master alarm with a line power supply circuit and slave alarms without a line power supply circuit, and are interconnected parallel by a two-wire signal line. The slave alarms are each configured to operate on driving power from the line power supply circuit supplied from the master alarm to the two-wire signal line. The master and slave alarms each comprise a voltage level fluctuation control circuit for dropping the voltage level of the two-wire signal line to a predetermined report level when a fire detection part detects a fire factor such as smoke or heat, and a fire alarm control part for outputting an alarm when determining that the voltage level of the two-wire signal line has been dropped to the predetermined report level. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement in a residential fire alarm system configured by connecting a plurality of fire alarms each having a fire detection unit in parallel.

Recently, residential fire alarm systems have become widespread in houses and play a useful role in disaster prevention.
This is a power supply that connects multiple fire alarms that output alarms when a fire factor such as heat or smoke is detected in parallel to a 2-wire signal line and supplies commercial power to each fire alarm A line is derived.
In such a configuration, each fire alarm is driven by the supply of commercial power through the power line derived from it, and when a fire alarm detects a fire factor, it performs alarm processing from itself. At the same time, by sending a fire signal through a two-wire signal line, an alarm is also output from another fire alarm.
However, in such a system, a circuit for generating its own drive power supply is required for each fire alarm device, which causes a high cost of the alarm device. In addition, since the commercial power source and the two-wire signal line are connected from each fire alarm device, the installation work becomes troublesome and becomes a factor of high cost.
Therefore, recently, there is a technique as shown in Patent Document 1 below. In this device, each fire alarm is connected in parallel to both a two-wire signal line as a power supply line and a two-wire signal line as various signal transmission lines such as a fire detection signal. By sharing the power supply through the power supply line between them, each fire alarm does not need a circuit for generating its drive power from a commercial power supply.
However, even in such a system, it is necessary to wire both the power supply line and the signal transmission line, which causes a high cost.
JP 2003-44955 A

  Therefore, the present invention has been proposed to solve the above situation, and it is not necessary to provide each fire alarm with a circuit for generating its own drive power from a commercial power supply, and wiring for connecting each fire alarm is provided. It aims at providing the fire alarm system which can make the alarm output which is the original function after simplifying.

  In order to achieve the above object, according to claim 1 of the present invention, the fire alarm is composed of at least one or more parent alarm devices having a line power supply circuit and a child alarm device having no line power supply circuit. These are connected in parallel with each other via a two-wire signal line, and each of the child alarm devices operates by receiving a driving power from a line power supply circuit that is supplied from the parent alarm device to the two-wire signal line. Each of the parent and child alarm devices has a voltage level that lowers the voltage level of the 2-wire signal line to a predetermined notification level when the fire detection unit detects a fire factor such as smoke or heat. A variation control circuit and a fire alarm control unit that outputs an alarm when it is determined that the voltage level generated in the two-wire signal line has decreased to a predetermined notification level are provided.

  According to claim 2, the level fluctuation control circuit performs an operation to restore the voltage level lowered to the notification level to the original level when the fire factor detected by the fire detection unit is eliminated, and fire alarm control. The unit is configured to stop the alarm output when the voltage level generated in the two-wire signal line returns to a level higher than a predetermined notification level.

  According to claim 3, the fire alarm control unit holds the alarm output for a predetermined time after the voltage level fluctuation control circuit has dropped to a predetermined notification level when the voltage level generated in the two-wire signal line falls. It has a configuration.

  According to a fourth aspect of the present invention, the voltage level variation control circuit includes a Zener diode that conducts the two-wire signal line in response to a fire signal from the fire detection unit.

  Here, when the two-wire signal line is made conductive by the Zener diode, the decrease in the voltage level of the two-wire signal line is limited to the Zener voltage. For this reason, even if the alarm level is lowered, the level at which the parent and child alarm devices operate is maintained, so that the parent and child alarm devices can operate without any problem.

  According to a fifth aspect of the present invention, the fire alarm device has a multistage connection configuration in which two or more parent alarm devices are connected in parallel to a two-wire signal line to a plurality of child alarm devices. For this reason, even if one parent alarm device breaks down, other child alarm devices can be operated by receiving power supply from other parent alarm devices, and the reliability of the system can be improved.

  In claim 6, the fire alarm device has an alarm stop button, and the operation of the alarm stop button causes the fire alarm control unit to stop the alarm output only for a predetermined period. It is configured to hold.

According to the first aspect of the present invention, each of the child alarm devices operates by receiving drive power from a line power supply circuit that is supplied from the parent alarm device to the two-wire signal line. Therefore, a circuit that generates drive power for the child alarm device Therefore, the circuit configuration of the child alarm device can be simplified.
Each of the parent and child alarm devices, when detecting a fire factor such as smoke or heat, lowers the voltage level of the two-wire signal line to a predetermined notification level, Since each outputs a warning after being identified, there is no need to provide a dedicated signal line for sending a command signal to output an alarm from the alarm device that detects the fire factor to other alarm devices. It can be simplified.

  According to claim 2, the level fluctuation control circuit performs an operation to restore the voltage level lowered to the notification level to the original level when the fire factor detected by the fire detection unit is eliminated, and fire alarm control. The unit is configured to stop the alarm output when the voltage level generated in the two-wire signal line returns to a level higher than the predetermined notification level. Thus, there is no need to provide a dedicated signal line for sending a signal for stopping the alarm output, and the system wiring can be simplified.

  According to claim 3, the fire alarm control unit holds the alarm output for a predetermined time after the voltage level fluctuation control circuit has dropped to a predetermined notification level when the voltage level generated in the two-wire signal line falls. Therefore, it is possible to reliably notify the user that a fire factor has occurred.

  According to a fourth aspect of the present invention, the voltage level variation control circuit includes a Zener diode that conducts the two-wire signal line in response to a fire signal from the fire detection unit. For this reason, the two-wire signal line is made conductive by the Zener diode, so that the decrease in the voltage level of the two-wire signal line is limited to the Zener voltage. Since the level to be maintained is maintained, the parent and child alarm devices can operate without problems.

According to a fifth aspect of the present invention, the fire alarm device has a multistage connection configuration in which two or more parent alarm devices are connected in parallel to a two-wire signal line to a plurality of child alarm devices. For this reason, even if one parent alarm device breaks down, other child alarm devices can be operated by receiving power supply from other parent alarm devices, and the reliability of the system can be improved.
In claim 6, since the fire alarm device holds the fire alarm control unit in a state where the alarm output is stopped for a predetermined period by the operation of the alarm stop button, the user who has confirmed the alarm output outputs the alarm. By operating the alarm stop button of any of the alarm devices , the alarm output of all alarm devices or specified alarm devices can be stopped.

  Embodiments of the present invention will be described below.

  FIG. 1 is a diagram showing an example of a schematic configuration of a fire alarm system of the present invention. In this device, a plurality of fire alarms 1, 1 ′ are connected in parallel to the two-wire signal line L. The fire alarm device 1 is configured as a parent alarm device, and the fire alarm device 1 'is configured as a child alarm device. Each configuration will be described later. In FIG. 1, a multi-stage connection configuration in which two or more (three in this case) parent alarm devices 1 are connected in parallel to a plurality of child alarm devices 1 '.

  The main alarm device 1 is supplied with commercial power (100 V), and the commercial power source is set to a predetermined power level Ln, which is sent to the two-wire signal line L. 'Uses a voltage level generated in the two-wire signal line L as a drive power supply.

  As shown in FIG. 2, the parent alarm device 1 receives a commercial power source, generates a driving power source having a constant power level Ln, and sends it to the two-wire signal line L. A power supply circuit 10 having a predetermined internal impedance, which is a drive power source of ', and a control circuit 11 that controls the parent alarm device 1 and a two-wire signal line, and a parent alarm device 1 and a child. A signal circuit 12 for operating in conjunction with the alarm device 1, an acoustic circuit 13 for outputting an alarm from a speaker, etc., and a control circuit 11 while monitoring a fire factor such as heat and smoke and detecting the fire factor And a fire detection circuit 14 for outputting a fire signal to the operation circuit 15 and an operation circuit 15 including various operation buttons B. On the other hand, the child alarm device 1 ′, which is a child device, includes the constituent elements 11 to 15 described above except for the power supply circuit 10 as shown in FIG. 2.

  3 and 4 show more specific configuration examples of the parent and child alarm devices 1 and 1 'having such a configuration. FIG. 3 is a diagram illustrating a specific internal configuration example of the parent alarm device 1. In the parent alarm device 1, the control circuit 11 includes a fire alarm control unit 11A and a voltage level fluctuation control circuit 11B.

  Further, the power supply circuit 10 includes a line power supply circuit 10A. Furthermore, when the voltage level of the two-wire signal line L is lowered to the notification level L0 by the processing described later, which is included in the speaker 13A and the voltage level fluctuation control circuit 11B included in the acoustic circuit 13, the level reduction is Zener. A Zener diode 15 is provided for limiting the voltage.

  Further, a voltage detection circuit 16 that detects a voltage level generated in the two-wire signal line L, and a relay circuit 17 that is included in the voltage level fluctuation control circuit 11B and whose contacts are turned on / off under the control of the voltage level fluctuation control circuit 11B are provided. .

  The fire alarm control unit 11A monitors the voltage level generated in the two-wire signal line L detected by the voltage detection circuit 16, and outputs a warning from the speaker 13A when it is determined that the voltage level has decreased to a certain notification level L0. Further, when it is determined that the notification level L0 has returned to the original voltage level Ln, the alarm output from the speaker 13A is stopped.

  While receiving the fire signal from the fire detection circuit 14, the voltage level fluctuation control circuit 11 </ b> B controls the relay circuit 17 to be switched on so that the Zener diode 15 becomes the two-wire signal line L as will be described later. Electrically connected, the voltage level generated in the two-wire signal line L is set to the notification level L0 defined by the Zener voltage. When no fire signal is received from the fire detection circuit 14, the relay circuit 17 is controlled to switch off, and the voltage level generated in the two-wire signal line L is returned to the original power supply level Ln.

Here, the Zener diode 15, the relay circuit 17, and the voltage detection circuit 16 function as the signal circuit 12 shown in FIG. 2 in conjunction with other parent alarm devices 1 and child alarm devices 1. It is.
The operation button B may be configured as a reset button that short-circuits the signal lines of the two-wire signal line L. In this configuration, when the operation button B is switched on and further switched off, the respective parts of the parent alarm device 1 and the child alarm device 1 ′ are reset and initialized, and the alarm output is also stopped. In this case, the operation button B may be configured separately from the parent alarm device 1 and each child alarm device 1 ′, and may be disposed independently on the two-wire signal line L.
Further, the operation button B may be configured as an alarm stop button. In this configuration, when the operation of the operation button B is accepted, the voltage level variation control circuit 11B is connected to the two lines within a range in which all of the parent alarm device 1 and each child alarm device 1 ′ can operate normally, as will be described later. While the voltage level of the expression signal line L is further lowered to the alarm stop level Lr that is lower than the notification level L0, the alarm stop level Lr is detected by the voltage detection circuit 16, and the fire alarm control unit 11A detects the predetermined time. Only the alarm output may be stopped. This alarm stop level Lr can also be set to 0 V. In this case, all of the parent alarm device 1 and the child alarm device 1 ′ may have a backup power source.

  FIG. 4 shows a specific configuration example of the child alarm device 1 ', which is different from the parent alarm device 1 in that it does not have the line power supply circuit 10A. The child alarm device 1 ′ is driven by a line power source supplied from the parent alarm device 1.

Hereinafter, three types of more detailed configurations will be described below in order as examples of configurations possible in the residential fire alarm system of the embodiment.
First, in the first configuration, when the fire factor detected by the fire detection circuit 14 is eliminated, the voltage level fluctuation control circuit 11B returns the voltage level of the two-wire signal line L lowered to the notification level L0 to the original level. The fire alarm control unit 11A stops the alarm output when the voltage level of the two-wire signal line L returns to a level higher than the notification level L0. (See (a) to (c) of FIG. 6).

The flowchart of steps 100 to 104 in FIG. 5 and the time charts in FIGS. 6A to 6C explain the operation according to the first configuration.
In the flowchart of FIG. 5, each of the alarm devices 1 and 1 ′ monitors a fire factor by the fire detection circuit 14, and when a fire factor is detected, the voltage level variation control circuit 11 </ b> B causes a two-wire signal line. The relay circuit 17 is turned on to lower the voltage level of L to the notification level L0. On the other hand, when a fire factor is not detected, the relay circuit 17 is set to restore the voltage level of the two-wire signal line L to the original level Ln. Is switched off (steps 100 to 102).

  Next, each of the alarm devices 1 and 1 ′ monitors the voltage level of the two-wire signal line L by the voltage detection circuit 16, and determines that it has been lowered to the notification level L0 by the fire alarm control unit 11A. An alarm is output from the speaker 13A (steps 103 to 104).

Therefore, when any one of the alarm devices 1 and 1 ′ switches the relay circuit 17 on, the voltage level of the two-wire signal line L decreases to the notification level L0. Unless all of 'switch off the relay circuit 17, the voltage level of the two-wire signal line L does not return to the power supply level Ln.
That is, the voltage level of the two-wire signal line L is maintained at the notification level L0 while any one of the alarm devices 1 and 1 ′ detects the fire factor. While the notification level L0 is maintained, all of the alarm devices 1, 1 ′ output an alarm.
As an example of this, in the time charts (a) to (c) of FIG. 6, a fire factor is detected from time T1 to T2, and during this period, the voltage level of the two-wire signal line L is the notification level. Since it has fallen to L0, the case where the alarm is also output according to it is shown.

  On the other hand, in the second configuration, when the voltage level of the two-wire signal line L drops to the notification level L0, the fire alarm control unit 11A is configured to hold the alarm output for a predetermined time thereafter. Further, the operation button B is used as a reset button, and by the operation, the fire alarm control unit 11A is returned to a standby state where no alarm is output.

The flowchart of steps 200 to 208 in FIG. 7 and the time charts in FIGS. 8A to 8D explain the second configuration.
In the flowchart of FIG. 7, each of the alarm devices 1 and 1 ′ monitors the fire factor by the fire detection circuit 14, and when the fire factor is detected, the voltage level variation control circuit 11B causes the two-wire signal line. After switching on the relay circuit 17 to lower the L voltage level to the notification level, a timer (not shown) is started to measure a predetermined time. If the timer has already been started, no restart is performed (steps 200 to 203). On the other hand, when the fire factor is not detected, it is determined by the timer whether the predetermined time has already elapsed, and when the predetermined time has not elapsed, it is determined whether the operation button B has been operated. (Steps 204-205). Here, when it is determined whether the predetermined time has elapsed or the operation button B is operated, the relay circuit 17 is switched off to restore the voltage level of the two-wire signal line L to the power supply level Ln (step 206).

  Next, each of the alarm devices 1, 1 ′ monitors the voltage level of the two-wire signal line L by the voltage detection circuit 16, and determines that it has been lowered to the notification level L0 by the fire alarm control unit 11A. An alarm is output from the speaker 13A (steps 207 to 208).

Therefore, after any of the alarm devices 1 and 1 ′ detects the fire factor lastly and lowers the voltage level of the two-wire signal line L to the notification level L0, the fire factor in all the alarm devices 1 and 1 ′. The voltage level of the two-wire signal line L returns to the power supply voltage level Ln only when a predetermined time has passed without being detected or when the operation button B is operated in that state. That is, while any one of the alarm devices 1 and 1 ′ detects a fire factor, the voltage level of the two-wire signal line L is maintained at the notification level L0 and the alarm devices 1 and 1 ′. If any of the above has detected a fire factor for the last time, or if the operation button B is not operated, the voltage level of the two-wire signal line L is the notification level even if the fire factor has been eliminated. Held at L0.

This will be further described with reference to the time chart of FIG. 8. A fire factor has occurred during the period from time T3 to time T4, whereby the voltage level of the two-wire signal line is the notification level L0. Even after the fire factor is eliminated, the notification level L0 is maintained until the reset operation is performed by the operation button B at time T5. During the reset operation, the voltage level of the two-wire signal line is short-circuited to 0 V, whereby all the alarm devices 1, 1 'are reset and initialized. Accordingly, the alarm output of all the alarm devices 1, 1 'is immediately stopped, and the voltage level of the two-wire signal line L returns to the power supply level Ln. The broken line in the figure indicates the operation when the reset operation is not performed. In this case, the voltage level of the two-wire signal line L is changed from the notification level L0 to the power supply level at time T6 when a predetermined time elapses. Returning to Ln, the alarm output is also stopped.

Finally, in the third configuration, the operation button B is an alarm stop button, and the voltage level fluctuation control circuit 11B is lowered to the notification level L0 when the fire factor detected by the fire detection circuit 14 disappears. The operation of returning the voltage level of the two-wire signal line L to the original level Ln and the operation of the operation button B causes the fire alarm control unit 11A to stop the alarm output for a predetermined period. I have to. In this configuration, all alarms of the parent alarm device 1, 1 'may be stopped by the operation button B, or only the alarm device 1, 1' operated by the operation button B is designated. As an alarm device 1, 1 ', the alarm may be stopped.

  The flowchart in FIG. 9 and the time charts (a) to (d) in FIG. 10 explain the third configuration. In the flowchart of FIG. 9, each of the alarm devices 1 and 1 ′ monitors the fire factor by the fire detection circuit 14, and when the fire factor is detected, the voltage level variation control circuit 11B causes the two-wire signal line. The relay circuit 17 is turned on to lower the voltage level of L to the notification level L0. On the other hand, when a fire factor is not detected, the relay circuit 17 returns the voltage level of the two-wire signal line L to the original level Ln. Is switched off (steps 300 to 302).

Next, each of the alarm devices 1 and 1 ′ monitors the voltage level of the two-wire signal line L by the voltage detection circuit 16, and determines that it has been lowered to the notification level L0 by the fire alarm control unit 11A. An alarm is output from the speaker 13A and the operation of the operation button B is accepted (steps 303 to 305). If the operation of the operation button B is not accepted, the process returns to the detection of the fire factor again (step 300).

On the other hand, when the operation of the operation button B is accepted, the voltage level of the two-wire signal line is further lowered to the alarm stop level Lr, while a timer (not shown) is started and the alarm output is detected for the fire factor only for a predetermined time. Regardless of the condition, the machine will stand by in the alarm stop state. Here, when a predetermined time is counted by the timer, the alarm output is resumed (steps 306 to 308).

If these controls are further explained according to the time chart of FIG. 10, a fire factor occurs at time T7, and this is detected, the voltage level of the two-wire signal line becomes the alarm level L0, and the alarm output state is entered. Yes. When the operation button B is operated at time T8 in the alarm output state, the voltage level of the two-wire signal line becomes the alarm stop level Lr during the operation, and then returns to L0. Then, the alarm output stop state is continued only for a predetermined time until time T9. However, at time T9, the fire factor is still continued, so that the alarm output state is restored. At time T10, since the fire factor is not detected, the voltage level of the two-wire signal line returns to the power supply level Ln.

It is a figure which shows an example of schematic structure of this invention system. It is a figure which shows an example of an internal structure of this invention system. It is a figure which shows an example of the specific internal structure of a parent alarm device. It is a figure which shows an example of the specific internal structure of a child alarm device. It is a flowchart for demonstrating operation | movement of this invention. (A)-(c) is a time chart for demonstrating operation | movement of this invention. It is another flowchart for demonstrating operation | movement of this invention. (A)-(d) is another time chart for demonstrating operation | movement of this invention. It is another flowchart for demonstrating operation | movement of this invention. (A)-(d) is another time chart for demonstrating operation | movement of this invention.

Explanation of symbols

1 parent alarm device 1 'child alarm device 14 fire detection circuit 10A line power supply circuit 11A fire alarm control unit 11B voltage level fluctuation control circuit 15 Zener diode B operation button (alarm stop button)
L 2-wire signal line

Claims (6)

In a residential fire alarm system configured by connecting multiple fire alarms each having a fire detection unit in parallel,
The fire alarm is composed of at least one parent alarm device having a line power supply circuit and a child alarm device having no line power supply circuit, and these are connected in parallel by a two-wire signal line. And each of the child alarm devices is configured to operate by receiving a driving power from a line power supply circuit supplied from the parent alarm device to a two-wire signal line,
Each of the above parent and child alarms
A voltage level fluctuation control circuit that lowers the voltage level of the two-wire signal line to a predetermined notification level when the fire detection unit detects a fire factor such as smoke or heat;
A residential fire alarm system comprising a fire alarm control unit that outputs an alarm when it is determined that the voltage level generated in the two-wire signal line has dropped to a predetermined notification level. In claim 1,
The voltage level fluctuation control circuit operates to restore the voltage level lowered to the notification level to the original level when the fire factor detected by the fire detection unit is gone, and to perform the fire alarm control. The unit is configured to stop the alarm output when the voltage level generated in the two-wire signal line returns to a level higher than a predetermined notification level. In claim 1,
The fire alarm control unit is configured such that the voltage level fluctuation control circuit holds an alarm output for a predetermined time after the voltage level generated in the two-wire signal line falls to a predetermined notification level. Fire alarm system for residential use. In Claims 1-3,
The voltage level variation control circuit is a residential fire alarm system including a Zener diode that conducts the two-wire signal line in response to a fire signal from a fire detection unit. In claims 1 to 4,
The fire alarm system is a residential fire alarm system having a multistage connection configuration in which a plurality of child alarm devices and two or more parent alarm devices are connected in parallel to the two-wire signal line. In claims 1-5,
The fire alarm has an alarm stop button, and by operating the alarm stop button, the fire alarm control unit is configured to hold the alarm output in a state where the alarm output is stopped for a predetermined period. system.

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