JPH0530472B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a pre-acting sprinkler fire extinguishing system.

<Prior art> In places such as semiconductor factories where water damage is a concern, instead of wet sprinkler fire extinguishing systems that are always filled with pressurized water up to the closed sprinkler heads at the terminals, pre-activated sprinkler fire extinguishing systems that are always filled with slightly pressurized air are used. Sprinkler fire extinguishing systems are preferred.

This pre-activation sprinkler fire extinguishing system is equipped with a closed type sprinkler head filled with low-pressure air in each warning area, as well as a fire detector. Fire extinguishing agent is released from the sprinkler head.

Therefore, since the fire detector and the sprinkler head mutually confirm the presence of a fire and then release the extinguishing agent, the device operates stably.

<Problems with the prior art> By the way, pressurizing the pipe in which the head is installed with weak air pressure makes it difficult to detect from the drop in pressure that the sprinkler head has been opened due to an impact, even though there is no fire. However, this required an expensive compressor.

<Means for Solving the Problems> In view of the above points, the present invention provides a closed sprinkler head and a fire detector in a restricted area, and a pipe equipped with a closed sprinkler head is equipped with a sprinkler head. In a pre-activation sprinkler fire extinguishing system in which air is constantly filled at a low pressure between the head and the on-off control valve in order to detect erroneous opening, the air in the piping is removed from one of the on-off control valves.
This is done using an air pressurization device that uses pressurized water on the next side.

<Function> In the fire extinguishing system of the present invention, the air in the pipe provided with the closed sprinkler head is pressurized by pressurized water from a water supply device such as a pump, and the air in the pressure vessel is compressed to a predetermined level. The air pressure is maintained at .

<Example> An apparatus according to an embodiment of the present invention will be described in detail below with reference to the drawings.

In the figure, reference numeral 1 denotes a differential or constant temperature fire detector installed in a warning area, which is connected to a receiving panel 3 through an electric line 2.

Similar to fire detector 1, 4 is a closed sprinkler head installed on the ceiling of the warning area, and piping 5
The opening/closing control valve 6 is connected through the opening/closing control valve 6.

The opening/closing control valve 6 is provided with an electromagnetic valve 7 for controlling its opening/closing, and is connected to the receiving board 3 through an electric line 8 . Also, on the primary side of the valve 6, there is a pump 9 and an electric line 1.
It is connected to a water supply device 12 consisting of a motor 11 connected to a receiving panel 3 through 0, and a pressurized air tank 13 that maintains the pressure on the primary side.

Reference numeral 14 denotes an air pressurizing device using pressurized water on the primary side, which is the gist of the present invention, and is composed of a pressurizing container 15 and a rubber bag 16 provided therein. rubber bag 16
is connected to the water supply device 12 and to the drain valve 20 through an electromagnetic valve 18 connected to the receiver panel 3 through an electric line 17 and a pipe 19. Container 15 is pressure regulating valve 2
1. Connected to piping 5 through orifice 22 and check valve 23.

24 and 25 are gate valves provided to bypass the pressurizing device 14 and the check valve 23, 26, 27, and 28 are pressure switches, 26 is a predetermined pressure drop in the pipe 5, and 27 is a primary valve of the valve 6. 28 operates when the air pressure of the pressurizing device 14 decreases by a predetermined value, and is connected to the receiver panel 3 through electric lines 29, 30, and 31, respectively.

Next, the operation of the above device will be explained.

The on-off control valve 6 is closed, the electromagnetic valve 18 is opened, the water supply device 12 is operated, and the primary side of the on-off control valve 6 is pressurized to a predetermined pressure, for example, 7 kgf/cm ² .

At this time, pressure is injected into the rubber bag 16 of the air pressurizing device 14 through the water electromagnetic valve 18, and the air outside the rubber bag 16 is pressurized. The pressurized air is reduced in pressure by the pressure regulating valve 21 to a low pressure, for example, 2 Kgf/cm ² necessary for monitoring erroneous head opening, and the pipe 5 is pressurized with weak air through the gate valve 25, and then the solenoid valve 18 and The gate valve 25 is closed and the device enters the monitoring state.

In addition, if a slight pressure drop occurs in the piping 5 other than when the head 4 is opened, the air pressurization device 14
Air is supplied to the piping 5 through the orifice 22 and the check valve 23 and maintained at a predetermined pressure.

When a fire occurs in this state and the fire detector 1 is activated, a fire signal is transmitted to the receiving panel 3.

In the receiver panel 3, this signal operates the electromagnetic valve 7 and opens the on-off control valve 6, so the pressure water on the primary side flows to the pipe 5, the pressure switch 27 is operated, and the water supply device 12 is activated.

Therefore, the pressurized water is released from the head 4, which is opened due to the heat generated by the fire at the fire location, and the water continues to be discharged until the fire is extinguished.

On the other hand, when the sprinkler head 4 is opened by a mechanical shock, the diameter of the orifice 22 is selected to be sufficiently smaller than the diameter of the head 4, so the pressure in the pipe 5 drops rapidly and the pressure switch 26 is turned off. The signal is activated and transmitted to the receiving board 3 through the electric line 29.

The receiver panel 3 detects that the fire detector 1 does not operate and only the pressure in the pipe 5 has decreased, and displays that an abnormality has occurred in the pipe 5 without opening the on-off control valve 6.

In addition, if a slight leak continues in the piping 5 and the air pressurizing device 14 is unable to replenish it, the pressure switch 28 of the pressurizing device 14 detects the decrease, and the solenoid valve is activated via the receiver panel 3. 18, inject pressure water into the rubber bag 16, and then put the container 1 back in.
5 and piping 5 to a predetermined pressure.

In the above embodiment, the air pressurization device is constructed by providing a rubber bag inside the pressurization container, but it is also possible to simply inject pressurized water from the bottom of the pressurization container.

In addition, the container of the air pressurization device does not consider pressurizing the piping 5 to a predetermined pressure all at once, but opens the gate valve 24 and the drain valve 20 to drain the water in the rubber bag 16, and then drains them again. By repeating closing and pressurizing, the capacity can be made sufficiently small compared to the pipe volume.

<Effects> In the fire extinguishing system of the present invention, the air in the piping equipped with the closed sprinkler head is pressurized by the pressure water on the primary side of the on-off control valve, so it is an inexpensive fire extinguisher that does not require the use of a compressor. This has the effect of providing an actuated sprinkler fire extinguishing system.

[Brief explanation of the drawing]

The drawing is a block diagram of an embodiment of the pre-acting sprinkler fire extinguishing system of the present invention. 1...Fire detector, 4...Closed sprinkler head, 5...Piping, 6...Opening/closing control valve, 14...
...Air pressurization device.

Claims (1)

[Scope of Claims] 1. A closed sprinkler head and a fire detector are installed in a restricted area, and piping equipped with a closed sprinkler head is equipped with these heads in order to detect accidental opening of the sprinkler head. In a pre-activated sprinkler fire extinguishing system that is constantly filled with slightly pressurized air between the on-off control valve, the air pressurization device pressurizes the air in the piping with pressurized water on the primary side of the on-off control valve. A pre-acting sprinkler fire extinguishing system characterized by: 2. The pre-activated sprinkler fire extinguishing device according to claim 1, wherein the air pressurization device is comprised of a pressurized container and a rubber bag provided inside the pressurized container and into which pressurized water is injected. 3. The pre-activation sprinkler fire extinguishing system according to claim 1, wherein the air pressurization device is constituted by a pressurized container into which pressurized water is injected from the bottom.