JPH08279088A - Fire alarm facility - Google Patents

Abstract

PURPOSE: To obtain the fire alarm facilities where a delay time from fire occurrence to alarming can be set. CONSTITUTION: Of the fire alarm facilities where plural fire sensors 2 arranged at respective parts in a building are connected to a fire receiver 10 through signal lines, the fire receiver 10 has a fire detecting circuit 11 which monitors the states of the respective fire sensors 2 and decides whether or not a fire is detected, an alarm output circuit 12 which actuates an alarm device 3 according to the fire detection output, and a delay circuit 13 which can be connected and disconnected with a changeover switch 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire alarm system capable of easily switching the timing of alarms when detecting a fire.

[0002]

2. Description of the Related Art Conventionally, in a fire alarm system, in a fire receiver serving as a fire receiver, when a fire signal is received from a fire detector, a main sound and a district sound sound. If this fire alarm is a non-fire alarm, not only the manager of the disaster prevention center or the like will deal with the useless alarm, but also the hotel or the like will bother the customer. When a fire occurs, it is necessary to sound the main sound and district sound, but as a measure for the administrator, first stop the sound and go to the site, after confirming the fire, cancel the stop state and perform the district sound. Sometimes.

[0003]

However, there is no problem in stopping the sound if the sound can be confirmed immediately and it takes a long time to ring again. It may be delayed for some reason. Further, it is troublesome to immediately perform a stop operation when a fire occurs and to perform a release operation on the receiver again when a fire is confirmed.

It is an object of the present invention to provide a fire alarm system capable of setting a delay time from the occurrence of a fire to an alarm.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a fire alarm system in which a plurality of fire detectors arranged in various parts of a building are connected to a fire receiver via signal lines. Between the alarm detection means and the alarm output means for activating the alarm device based on the fire detection output of the fire detection means for monitoring the state of the fire detector and discriminating the detection of the fire. And an alarm delaying unit which is provided and whose connection and disconnection can be switched by a changeover switch.

[0006]

According to the present invention, it is possible to switch whether the alarm is issued at the same time as the detection of the fire or the alarm is issued after a predetermined delay time in the fire receiving section. If a fire can be confirmed, the fire can be confirmed during the delay time, and in the case of a non-fire alarm, the ringing can be stopped. Further, in the case of a system in which the number of managers is small and the user often leaves his seat, the alarm can be issued at the same time as the fire without taking the above delay time.

[0007]

EXAMPLE An example of the present invention will be described below.

FIG. 1 shows a fire receiver R to which the present invention is applied.
It is a circuit diagram of E.

In the figure, a fire receiver 10 is connected to a plurality of fire detectors 2 and a plurality of district bells 3 which are shown in a simplified manner, and these devices are typically devices provided in each part of a building. Then, one is shown in a block. Then, in the fire receiver 10, a comparator and a divider for monitoring the states of the plurality of fire detectors 2 and detecting a fire signal due to a short-circuit state between two signal lines L by a common line and individual signal lines A fire detection circuit 11 as a fire detection means configured by a resistor and the like, and an alarm output means configured by a transistor, a relay, etc. for controlling the activation of the district bell 3 based on the fire detection output from the fire detection circuit 11. An alarm output circuit 12, a delay circuit 13 configured by a timer or the like for delaying the start control output from the alarm output circuit 12, and an output to the district bell are performed via the delay circuit 12 or from the alarm output circuit 12. It has a changeover switch 14 for changing over directly. These delay circuits 1
An alarm delay unit is constituted by 3 and the changeover switch 14.

Next, the operation of the above embodiment will be described.

First, when the fire detector 2 detects a fire, the signal lines L are short-circuited and a fire signal is output. The fire detection circuit 11 detects a short circuit between the signal lines L and detects that the fire detector 2 has detected a fire. Here, the fire detection circuit 11 may be provided with a storage function.
This accumulation function is a function of recognizing a fire only when the detection state continues for a predetermined time, for example, 30 seconds, when a fire detector detects a fire. It is intended, but it is not necessary on the receiver side if the fire detector is a storage type. When the fire detection circuit 11 detects a fire signal, the alarm output circuit 12
Fire detection output to. Here, the output of the fire detection circuit 11 is output not only to the alarm output circuit 12 but also to a display circuit or a transfer circuit (not shown), and may be output to each unit as necessary.

The alarm output circuit 12, which receives the fire detection output, outputs a start control to the district bell 3 via the changeover switch 14. This activation control output may be a ringing sound for a plurality of district bells 3, but when performing a ringing sound as equipment, an interlocking matrix in which diodes are combined may be output only to the required district bells 3. .

When the contact of the changeover switch 14 is switched, the start control output of the alarm output circuit 12 is not immediately transmitted to the district bell 3. That is, the start control output is transmitted via the delay circuit 13 and the changeover switch 14 to the district bell 3
Is output to This delay circuit 13 has a predetermined delay time of 2 minutes to 5 minutes, for example, 2 minutes, and while the alarm is being delayed, the fire receiver 10
The administrator who saw the fire display (not shown) heads to the site for confirmation, and in the case of no fire, a stop input can be made to the alarm output circuit 12. Even if the administrator takes time to confirm whether or not there is a fire, an alarm will be issued after 2 minutes and there will be no delay.

In this embodiment, the district bell 3 simultaneously determines whether or not there is a delay, but it may be set for each district bell 3. For example, a delay is applied to the guest room part of the hotel and a delay is applied to the work part. You may comprise so that it may not apply.

Further, although the above embodiment shows the so-called P type fire alarm equipment, it may be used for so-called R type equipment. At that time, the fire detector and the district bell are addressably monitored and controlled, the fire detector signals the fire signal with its own address to the fire receiver, and the district bell is addressed from the fire receiver and transmits a start command signal. Start when And the fire detection means comprises a reception circuit and a microprocessor for recognizing the fire signal by receiving the signal of the sensor, and the alarm output means comprises a transmission circuit and a microprocessor for outputting an activation command to the district bell, The alarm delay means for switching between connection and disconnection by the changeover switch may be composed of an operation unit for inputting a changeover and a timer for delaying the start of signal transmission.

[0016]

As described above, in the fire alarm system according to the present invention,
The fire receiving unit monitors the state of each fire detector and judges the detection of a fire, and a fire detection unit that activates an alarm device based on the fire detection output of the fire detection unit.
Since it has an alarm delay means which is provided between the alarm output means and the alarm device and which can be switched between connection and disconnection by a changeover switch, it is possible to switch the presence or absence of a predetermined delay time of the alarm. The optimum alarm timing can be set based on the above.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a fire receiver showing an embodiment of the present invention.

[Explanation of symbols]

 11 Fire detection circuit 12 Alarm output circuit 13 Delay circuit 14 Changeover switch

Claims (1)

[Claims] 1. A fire alarm facility in which a plurality of fire detectors arranged in each part of a building are connected to a fire receiver via a signal line, wherein the fire receiver monitors the state of each fire detector. Fire detection means for determining the detection of a fire, an alarm output means for activating an alarm device based on the fire detection output of the fire detection means, and a switching device provided between the fire detection means and the alarm device. A fire alarm facility, comprising: an alarm delaying unit that can be switched between connection and disconnection by a switch.