JPH04470Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improved fire alarm system, and more specifically, to a fire alarm system that accurately issues a fire alarm depending on the situation in a protected area.

[Prior Art] Fire alarm systems are required by law to be installed in department stores, hotels, hospitals, etc. where many people gather, and a large number of such systems are currently in operation. A fire alarm system is capable of quickly detecting the occurrence of a fire and alerting people such as building supervisors through a built-in annunciator device.
Further, some fire alarm devices have a function of driving fire extinguishing equipment such as sprinklers. FIG. 2 shows a block diagram of a conventional fire alarm system. The fire alarm system is constructed by setting a plurality of fire systems Ia, Ib, . . . In in each protected compartment. That is, at least one fire system I is required to monitor fires in each protected compartment. Each fire system I has a sensor 1 that detects smoke, an accumulation time type P-type 1st class receiver 2 (hereinafter referred to as receiver), and processes alarm signals by inputting signals output from the receiver 2. A logic circuit 3 that performs
and an annunciator device 4. Each fire system I performs the operations shown in the flowchart of FIG. First, when the sensor 1 detects smoke at a predetermined concentration or a predetermined temperature change, this sensor outputs a fire detection signal to the receiver 2 at the next stage. When the receiver 2 receives the fire detection signal, it outputs an alarm signal B that rises for a certain period of time and an alarm signal A that generates a one-shot pulse signal A' with a short H level time. Further, after a certain interval, when the receiver 2 detects that the fire detection signal is continuously being sent from the sensor 1, it generates the rising alarm signal A again. If there is no fire signal after a certain interval, the alarm signal A will not rise. The logic processing circuit 3 is internally cleared by the one-shot pulse A' and is in a standby state while the alarm signal B is rising, until the next rising edge A of the alarm signal A' occurs. In this case, a drive signal C is sent to the annunciator device 4. Such signal processing is effective in preventing malfunctions such as the sensor 1 outputting a fire detection signal due to cigarette smoke even though there is no fire, and takes into account variations in the sensitivity of the sensor 1. If you do, it is necessary. The annunciator device 4 is driven by the drive signal C and performs a buzzer operation or a flicker operation to arouse the observer's attention.

[Problems to be solved by the invention] However, the situations of protected compartments generally vary. That is, since a protected area such as a conference room is filled with cigarette smoke, the conventional fire alarm system having the above configuration is effective in preventing malfunctions caused by cigarette smoke. However, in protected areas where fire is not used or where few people come and go, such as hospital rooms or warehouses, it is not necessary to provide the logic processing circuit 3 in the fire alarm system.
It is more convenient to operate the annunciator device using the output signal from the receiver 2, as this allows for prompt fire alarm.

However, in conventional fire alarm systems, each fire system I is not installed individually in each protected compartment, but the receiver 2, logic processing circuit 3, and annunciator device 4 of each fire system I are integrated in, for example, a monitoring room. It has a structure in which the sensor 1 is individually attached to each protected compartment.
Therefore, for example, when this conventional fire alarm system is installed in a building having various protected compartments, such as a conference room or a warehouse, the fire system is installed equally in all the protected compartments.
In order to ensure prompt fire detection in protected areas such as warehouses of buildings, a new sensor and a detection signal output from the sensor are received and activated separately from the fire system I. This is uneconomical because it requires a receiver that outputs a signal and an annunciator device that issues a visual and audible alarm using this drive signal. However, since the diversity of protected compartments differs for each building, it is necessary to manufacture and install a specially designed fire alarm system with a fire system that omits the logic circuit 3 for specific protected compartments. becomes too costly,
From a cost-effectiveness perspective, it is unrealistic and no one would adopt it.

[Purpose of the invention] This invention was made based on the above circumstances. In other words, the purpose of this invention is to provide a fire alarm system with a simple structure and a variety of protection areas, without the need for a special fire alarm system such as a fire system that omits logic processing circuits for specific protection areas. To provide an inexpensive fire alarm device capable of accurately issuing a fire alarm for any building according to the situation of protected compartments.

[Means for Solving the Problems] In order to achieve the above object, the fire alarm device of the present invention includes a sensor that is placed in a protected area, detects a fire, and outputs a fire detection signal, and a sensor that detects a fire and outputs a fire detection signal. A fire system includes a receiver that outputs an alarm signal when the fire detection signal is input, and a logic processing circuit that outputs a drive signal to an annunciator device having a warning function when a plurality of the alarm signals are input within a certain period of time. In a fire alarm system provided in each protected compartment, the alarm signal output from the receiver is sent to the logic processing circuit or the annunciator device according to the usage status of each fire system by a switching circuit provided for each fire system. This is a fire alarm device characterized by having a configuration in which input is selectively made.

[Example] Hereinafter, the configuration of the present invention will be described in detail based on an example shown in the drawings. However, the same parts as the conventional technology,
The same reference numerals are given to the equipment, and detailed description thereof will be omitted. FIG. 1 shows a block diagram of a fire system forming the fire alarm system of the present invention. This fire alarm system is formed by accommodating a number of fire systems corresponding to the number of protected compartments. The fire system includes a sensor 1 that outputs a fire detection signal when it detects smoke at a predetermined concentration or temperature change, a P-type 1st class receiver 2 that generates alarm signals A and B in a predetermined format, and a logic processing circuit 3. , a toggle switch 5, which serves as a switching circuit in this embodiment, and an annunciator device 4. The switching circuit is operated by switching the toggle switch 5.
When switching to the contact a side in the figure, the alarm signals A and B from the receiver 2 are directly input to the annunciator device 4 without being input to the logic processing circuit 3. The annunciator device 4 is activated by the rising edge of the alarm signal A, and alerts the supervisor to the alarm that a fire has occurred by activating the flicker and the buzzer. In this embodiment, only the method of activating the annunciator device 4 by the rising edge of the alarm signal A has been described, but depending on the input circuit of the annunciator device 4, the alarm signals A and B may be activated.
It is also possible to use an AND method or a method in which activation is performed by the rising edge of the alarm signal B. When the toggle switch 5 is switched to the b contact side in the figure, the alarm signals A and B from the receiver 2 are processed by the logic processing circuit 3. That is, it is internally cleared by the one-shot pulse A' of alarm signal A, and is maintained in a standby state while alarm signal B is rising, and when the alarm signal A rises again during the standby state, the internal latch is cleared. and sends a drive signal C to the annunciator device 4. Normally, this internal latch of the logic processing circuit 3 is released as follows.
After the supervisor visually confirms, for example, the protected area where the fire is occurring in the annunciator device 4, he or she takes some kind of extinguishing means and then activates the reset device of the annunciator device 4. When the reset device (often a pushbutton switch) of the annunciator device 4 is activated, a reset signal D is sent to the logic processing circuit 3 and the internal latch is released.

In this embodiment, the bypass circuit is set to toggle switch 5.
Although we have explained the structure configured in , it is not limited to a bypass circuit with this structure in particular, but it can be configured with various switches, various relays, analog switches, etc. if matching with alarm signals A and B can be achieved. You can also do it. In particular, by using various relays, analog switches, etc., it is also possible to construct a bypass circuit that can be operated remotely.

Furthermore, instead of the receiver 2 and the logic processing circuit 3 in the embodiment shown in FIG. 1, a receiver that outputs only the alarm signal A shown in FIG. 3 when the fire detection signal output from the sensor 1 is inputted is used. When the alarm signal A output from this receiver is input, the standby signal B shown in FIG. 3 is generated simultaneously, and a predetermined number of alarm signals are input while the standby signal B is held. A logic circuit 3 that outputs a limited drive signal C may also be used.

As detailed above, according to this embodiment, for example, the toggle switch 5 is switched to the b contact side for protected areas such as conference rooms and work rooms where many people come and go, and for protected areas such as warehouses, archives, and reference rooms. For protected compartments, simply by switching the toggle switch 5 to the a contact side, fire can be detected reliably without malfunction in protected compartments where many people come and go, and quickly in protected compartments where few people come in and out. Can detect fire. Furthermore, fire detection according to the protected area can be performed simply by flipping a switch, and there is no need to separately provide a specially designed fire alarm device.

[Effects of the invention] As is clear from the above explanation, according to the invention,
Since the driving method of the annunciator device can be changed according to the nature and specification status of the protected compartment, it is easy to configure and allows for reliable and quick fire monitoring according to the nature and situation of the protected compartment. This makes it possible to provide a fire alarm system that is cheaper.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a fire system forming the fire alarm system of the present invention, FIG. 2 is a block diagram showing a conventional fire alarm system, and FIG. 3 is a flowchart thereof. 1...Sensor, 2...P type 1st class receiver, 3...
Annunciator, 5... Toggle switch,...
Fire system, A, B... Alarm signal, C... Drive signal.

Claims (1)

[Scope of utility model registration request] a sensor that is placed in a protected area and that detects fire and outputs a fire detection signal; a receiver that outputs an alarm signal when the fire detection signal of the sensor is input; and a receiver that inputs a plurality of the alarm signals within a certain period of time; Then, in a fire alarm system in which each protected compartment is equipped with a fire system consisting of a logic processing circuit that outputs a drive signal to an annunciator device having an alerting function, the alarm signal output from the receiver is transmitted to each fire system. A fire alarm device characterized in that a switching circuit provided selectively inputs the input to the logic processing circuit or the annunciator device according to the usage status of each fire system.