JPH0348703Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a fire alarm system, and particularly to a display control means for an operation indicator of a fire detector.

[Conventional example]

The fire detector of a fire alarm system has traditionally been equipped with an indicator, such as an operation indicator light, that lights up when activated, and this indicator light is mainly used to identify the alarm detector in the event of a false alarm. Ta. (for example,
(Japanese Patent Publication No. 36-376) [Problems to be solved by the invention] As mentioned above, the operation indicator of a fire detector is rarely used other than when a false alarm is triggered, and is irrational and unreasonable. In addition, if a fire detector with such an operation indicator is connected to a storage-type fire receiver used to prevent false alarms, for example, such a receiver will be connected to the first detector. The fire detector is configured so that the main alarm will be emitted from the fire receiver when it is restored and the alarm is activated again after a predetermined period of time has elapsed. There were some problems with display etc.

[Means for solving problems]

The fire alarm system of this invention is supplied with power through a pair of district lines for both power and signal use, detects heat, smoke, etc. caused by a fire, and activates when the detection level exceeds a predetermined level. A fire detector is equipped with a fire detector that maintains continuity between the lines at a constant impedance and has an activation indicator that is driven by the current when conduction occurs, and a fire is detected by supplying power to the pair of district lines and detecting the activation current of the fire detector. In a fire alarm system comprising a fire receiver that determines the occurrence of a fire and displays an alarm, the fire receiver includes a display control circuit that outputs output signals in two or more different modes depending on processing conditions, etc. , further comprising a current supply unit that is driven when the output signal of the display control circuit and the activation of the fire detector is detected, and supplies a current to the district line to drive the display of the fire detector. That is.

〔Example〕

Next, the fire alarm system of this invention will be explained in detail based on the drawings showing one embodiment thereof.

FIG _. 1 shows an example of a schematic circuit of the main parts consisting of a partial block diagram of the device of this invention. District lines l ₁ and l ₂ to which fire detectors D are connected extend through lines d, respectively.

Furthermore, the fire receiver R includes a second power source _E2 ,
The normally open contact a- ₁ of the district relay A and resistors R ₁ and R ₂ are connected in series from the power source E 2 and connected in parallel to the district line l ₁ . Power supply E ₂ is power supply E ₁
However, the power supply E ₂ may be of relatively inferior quality compared to the power supply E ₁ .

The second normally open contact a-2 of district relay A is a resistor
District line l ₁ of district relay A connected in series with R ₃
It is connected between the side and negative line to form a self-holding circuit for district relay A.

Furthermore, a transistor is connected across the resistor _R2 .
An emitter-collector circuit is connected to Tr ₁ , and its base electrode is connected to the display control circuit 10 via a protective resistor R ₄ . Resistance R ₁ , R ₂ , R ₄ ,
A circuit consisting of a diode d and a transistor _Tr1 forms a current supply section that supplies a drive current for the display of the fire detector D. This display control circuit 1
0 is comprised of a plurality of pulse generators 1-3 and selection switches _S1 - _S4 . Selection switch S ₁
~ _S4 may be selectively controlled manually or, although not shown in the figure, in the case of a storage type fire receiver, for example, it may be configured to be turned on by the storage start signal, or it may be configured to be turned on by the storage start signal. If the device has a district line and uses an operation indicator to identify when another line is in operation, it may be configured to be turned on by another line operation signal. .

That is, this display control circuit 10 outputs a plurality of different types of output signals corresponding to the processing status of the fire receiver R, etc.

FIG. 2 shows time charts showing examples of output pulses from each of the pulse generators 1 to 3.

In such a configuration, when fire detector D is activated, district relay A is activated and sounds an alarm (not shown). Further, the contact a-1 is closed, and the indicator light of the fire detector D is continuously lit through the transistor _Tr1 and _the resistor _R1 , which are turned on via the previously closed switch S1. Further, by closing contact a-2 of district relay A, district relay A is self-maintained, and remains in an operating state until it is restored by operating a recovery switch (not shown).

When the fire alarm system is being inspected, by turning on the selection switch S2, the pulse generator ₁ is activated and generates a pulse as shown in Figure 2 I. At this time, the fire alarm is detected. When the fire detector D is activated, the operation indicator LED of the fire detector D flashes at the pulse cycle shown in FIG. 2I, and it can be identified that the fire detector D is being inspected. Note that the value of the resistor R ₂ is set to a value that is greater than or equal to the holding current of a relay such as an SCR of the fire detector D.

When a storage type fire receiver is used as a receiver and the fire detector D side indicates that the storage is in operation, the selection switch _S2 is turned on. In addition, when indicating that another line is in operation, turn on the selection switch S ₃ and perform the same operation as described above, respectively.
The operation indicator light LED of the fire detector D can be displayed blinking with the pulse shown in , and the status of the fire receiver R can be identified on the fire detector D side from these lighting states. Note that these are just examples, and other blinking cycles may be used.

Figure 3 shows another embodiment of a blinking current supply circuit to the indicator light LED of fire detector D, and the voltage regulator diode Z of this circuit is selected to be equal to or lower than the operating holding voltage of the SCR of detector D. The circuit shown in FIG. 1 is of the current variable type, whereas this circuit is of the voltage variable type, and its operation is substantially the same as that of FIG.

In this embodiment, an indicator light such as an LED is used as an operation indicator of the fire detector D, but a buzzer, a speaker, or the like may be used instead of the indicator light.

Further, semiconductor circuits can also be used for the district relay A and selection switches _S1 to _S4 .

[Effect of idea]

As mentioned above, the device of this invention is capable of identifying and displaying the status of various fire receivers without significantly changing the basic configuration of the conventional operation indicator installed in the fire detector. In particular, it has features such as being able to greatly streamline maintenance after installation in buildings, etc.

[Brief explanation of drawings]

Fig. 1 is a schematic circuit diagram of the main parts of the fire alarm system of this invention, Fig. 2 is a time chart for explaining the operation of Fig. 1, and Fig. 3 is a circuit diagram of the blinking current supply section to the indicator light LED. Examples are shown below. R...Fire receiver, D...Fire detector, 10...
...display control circuit, A...district relay.

Claims (1)

[Scope of claim for utility model registration] Power is supplied through a pair of district lines for both power and signal use, detects heat, smoke, etc. of fire phenomenon, and activates when the detection level exceeds a predetermined level, A fire detector is equipped with a fire detector that maintains continuity between the lines at a constant impedance and has an activation indicator that is driven by the current when conduction occurs, and a fire is detected by supplying power to the pair of district lines and detecting the activation current of the fire detector. In a fire alarm system consisting of a fire receiver that determines the occurrence of a fire and displays an alarm, the fire receiver has two
A display control circuit that outputs output signals of the above different modes, and a display control circuit that is driven when the output signal of the display control circuit and the activation of the fire detector is detected, and that drives the display of the fire detector on the district track. A fire alarm device comprising: a current supply unit that supplies a current.