JPH07111B2 - Automatic fire extinguisher - Google Patents

Description

TECHNICAL FIELD The present invention relates to an automatic fire extinguisher for detecting a fire in a building or the like and automatically extinguishing the fire.

[Conventional technology]

2. Description of the Related Art In recent years, automatic fire extinguishing devices that automatically detect and extinguish a fire have been used as fire extinguishing equipment in buildings and the like.

Conventionally used automatic fire extinguishers usually apply water pressure to the sprinkler head installed on the ceiling by piping from an elevated water tank or pressure tank etc.When a fire occurs, the heat of the fire causes the head to reach the operating temperature. It has a structure that reaches and is released and starts watering. In this structure, when water sprinkling is started, water flows in the pipe between the head and a pressurized water source such as an elevated water tank, and an automatic alarm valve provided in the middle of the pipe is activated by the action of running water,
At the same time that an alarm is issued electrically or mechanically, the sprinkler pump is activated via the electric control panel to extinguish the fire.

In the above structure, a pressure switch is activated to start the pressurized water supply device when the pressure in the pressure tank decreases due to the start of sprinkling, and a smoke detector and a heat detector are used as fire detection means. Some are used together.

[Problems to be Solved by the Invention]

However, the conventional automatic fire extinguishing apparatus as described above has a drawback in that a malfunction is likely to occur due to a false alarm or a false recognition from the fire detection means, and the malfunction causes a considerable amount of water jet damage.

Further, even when a fire actually occurs, the water injection does not automatically stop due to extinguishing the fire, which causes a problem of so-called overwater damage.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an automatic fire extinguisher capable of minimizing malfunctions due to false alarms or misidentifications and damage due to flooding.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides a smoke detector, a heat detector, and a water jet nozzle provided for each room to be monitored for fire occurrence in a building; and a water jet nozzle and a pressurized water source. An electromagnetic on-off valve for opening and closing a pipe line between the smoke detector and the heat detector, and the output signal from the heat detector is determined by itself or at the same time as the output signal from the smoke detector. When it is true fire information when it continues for more than a time, at that time, the electromagnetic on-off valve connected to the water injection nozzle of the room with the heat detector is opened to inject pressurized water from the water injection nozzle,
When the output signal of the heat sensor was turned off by this water injection, the electromagnetic on-off valve was closed after continuing the water injection for a predetermined time from that moment, and then the output signal from the smoke sensor or the heat sensor was input. If you want to open the water injection nozzle again,
A control unit that repeats the operation of closing the water injection nozzle after a predetermined time from the disappearance of those output signals by the water injection until the output signals of the smoke detector and the heat detector are not generated at all. The control unit is equipped with a switching function that switches the opening / closing operation of the electromagnetic on-off valve between manual and automatic control.

[Action]

In the above configuration, in the case of only the output signal of the smoke detector,
Alternatively, if the output signal of the heat detector stops within a predetermined time, it is determined as misidentification information and the pressurized water is not jetted from the water jet nozzle.

When the output signal of the heat detector continues for more than a predetermined time, it is determined that a fire has occurred, and water is jetted from the water jet nozzle to extinguish the fire. When the temperature inside the room decreases due to this fire extinguishing and the output signal of the heat detector is turned off, water injection is continued for a predetermined time thereafter to complete the fire extinguishing.

Further, after the water injection, if the fire does not extinguish and burns up again, it is determined that a fire has occurred by the output signal of either the smoke sensor or the heat sensor, and the water is immediately injected. Then, the above operation is repeated until the output signals from both the sensors disappear, and the fire is completely extinguished.

On the other hand, if the discoverer who knew of the fire occurrence based on the output signal of the smoke detector or the heat detector determines that the fire can be extinguished manually at the initial stage of the fire, the control of the control unit is switched to manual, Extinguish the fire with a portable fire extinguisher. As a result, it is possible to prevent the flood damage in the room due to the injection of the pressurized water from the water injection nozzle.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in the figure, a smoke detector 2, a heat detector 3, and a water injection nozzle 4 are provided in each room 1 to be monitored for fire occurrence, and each water injection nozzle 4 includes an electromagnetic opening / closing valve 5. A pressure pump 6 and a pressurized water source 7 such as an elevated water tank are connected via.

The control unit for controlling the electromagnetic on-off valve 5 by inputting the output signal of the smoke sensor 2 or the heat sensor 3 includes a microcomputer (CPU) 8 and the electromagnetic on-off valve 5 to be operated according to a command from the CPU 8. It is composed of a solenoid valve selection drive circuit 9 for selecting and driving.

The CPU 8 is provided with a control switching function for switching an automatic control mode in which a command to the solenoid valve selection drive circuit 9 is automatically executed by a predetermined program to a manual control. For this changeover, a changeover switch is provided on the control operation panel or the like, and the control mode can be changed over by operating the changeover switch.

The control box indicated by reference numeral 10 is provided with its automatic-manual switch 13, an alarm light (PL) 11, an alarm buzzer (BZ) 12, a fire occurrence location display 14, and the like.
Also, an alarm bell (BL) 15 is installed as an outdoor installation.

The automatic fire extinguisher of this embodiment has the structure as described above, and its operation will be described below.

The following Table 1 is a summary of various sensing modes that the CPU 8 receives and the operation contents thereof, and the operation of the fire extinguisher will be described based on Table 1.

The smoke sensor 2 emits smoke having a predetermined concentration or more for a predetermined time (for example,
When it senses for more than 30 seconds (sensing mode I), CPU8 responds to its output signal by buzzer 12 and outdoor installation buzzer 15
The alarm lamp 11 is operated, and the room number indicator lamp corresponding to the fire occurrence location indicator 14 blinks.

When the above output signal disappears within a predetermined cancel time, it is determined to be a false alarm, the above operation is stopped, and the state returns to the first alert standby state. In this case, the electromagnetic on-off valve 5 remains closed and the water injection nozzle 4 does not inject water.

When the heat sensor 3 senses heat above a predetermined temperature (for example, 70 ° C.) (sensing mode II), the CPU 8 responds to the output signal thereof and causes the buzzer 12 and the outdoor installation buzzer 15 to ring,
The alarm lamp 11 is operated and the room number indicator lamp corresponding to the fire occurrence location indicator 14 is turned on.

When the output signal of the heat detector 3 disappears within a predetermined cancellation time (for example, 5 seconds), the CPU 8 determines that it is a false alarm, stops the above operation, and returns to the first alert standby state.

When the output signal of the smoke sensor 2 continues and the output signal from the heat sensor 3 is input to the CPU 8 due to the temperature rise (sensing mode III), the CPU 8 performs the same operation as above.

When a fire occurs due to a combustible substance that emits less smoke, the heat sensor 3 first reacts, and then the smoke sensor 2 delays.
When the output signal of is input to CPU8 (sensing mode IV),
The CPU 8 executes the same operation as above.

In the above (sensing modes II, III, IV), if the output signal from the heat detector 3 continues for more than the above cancellation time, the CPU 8 determines that a fire has occurred, and a predetermined time ( After 15 seconds in the sensing mode II where the heat detector operates independently, after 10 seconds in the sensing modes III and IV where both the heat detector 3 and the smoke detector 2 operate)
Then, the solenoid on-off valve 5 is opened via the solenoid valve selection drive circuit 9, and the pressurized water is jetted from the water jet nozzle 4.

As a result of the above execution, when the room temperature drops to room temperature and the output signal from the heat detector 3 is turned off, the CPU 8 closes the electromagnetic opening / closing valve 5 and stops the pressurizing pump 6 after a predetermined time 180 seconds from that point, Stop water injection.

In this way, the water injection is continued for a predetermined time even after the output signal of the heat sensor 3 is turned off. This is to completely extinguish the fire when there is embers after extinguishing by the water injection, and to prevent overwater damage. This is to keep it to a minimum.

After performing the above operation, the smoke sensor 2 or the heat sensor 3
When the output signal of is turned on again, the CPU 8 determines that reignition has occurred, and immediately executes the above operation. Then, the operations of and are repeatedly executed until these output signals are no longer turned on.

As a result, the fire that has occurred can be extinguished completely.

On the other hand, in the above, when the finder who saw the fire occurrence location display section 14 by the sound of the buzzer 12 or the bell 15 judges that it is possible to extinguish manually because it is the initial stage of only smoke generation by blinking the room number indicator light Switches the automatic-manual switch 13 to manual and extinguishes the fire with a fire extinguisher installed in the room. As a result, it is possible to avoid water injection in the automatic mode and prevent damage to the interior of the room due to water injection.

〔The invention's effect〕

As described above, according to the automatic fire extinguisher of the present invention, it is possible to extinguish an actual fire early and surely while significantly reducing the risk of water injection due to a malfunction, and to prevent overwater damage. It can be kept to a minimum. Therefore, there is an effect that disaster prevention of various facilities and equipment can be done efficiently and accurately without causing unnecessary damage.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of an embodiment of an automatic fire extinguisher according to the present invention. 2 ... smoke detector, 3 ... heat detector, 4 ... water injection nozzle, 5 ... solenoid on-off valve, 8 ... microcomputer (CPU), 9 ... solenoid valve selection drive circuit.

Claims (1)

[Claims] 1. A smoke sensor, a heat sensor, and a water injection nozzle provided in each room of a building fire monitoring target; and a pipe line between the water injection nozzle and a pressurized water source is opened and closed. When the output signal of the smoke detector or the heat detector is input and the output signal from the heat detector continues for a predetermined time or more independently or simultaneously with the output signal from the smoke detector. When it is judged as true fire information, at that time, the electromagnetic on-off valve connected to the water injection nozzle in the room with the heat detector is opened to inject pressurized water from the water injection nozzle, and the output of the heat detector is output by this water injection. When the signal is turned off, the electromagnetic on-off valve is closed after continuing the water injection for a predetermined time from that moment, and then the water injection nozzle is opened again when the output signal from the smoke sensor or the heat sensor is input. , Their output signals disappear due to the water injection And a control unit for repeating the operation of closing the water injection nozzle after a predetermined time until the output signals of the smoke detector and the heat detector are not generated at all; the control unit manually opens and closes the electromagnetic opening / closing valve. An automatic fire extinguisher equipped with a switching function for switching between automatic control and automatic control.