JPS6266875A - Fire extinguishing apparatus reduced in water loss - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Technical fields> This invention relates to a fire extinguishing system with little water damage.

<Prior Art> Conventionally, a fire extinguishing system as shown in FIG. 3 has been known. This device is equipped with a heat detector 31 and a closed splinter head 32 on the ceiling of the guarded area. The heat sensor 31 is connected to a receiving board 34 via an electric line 33, and a control valve 36 and a liquid pump 37 are connected to a piping 35 in which a closed sprinkler head 32 is installed. 38 is connected to the receiving board 34.

When the heat detector 31 is activated by the heat from the fire, the receiver board 34
The liquid feeding pump 37 operates via the 1i magnetic valve 3.
8 operates and the control valve 36 opens, and when the temperature rises further and the splinter head 32 is opened, extinguishing water is discharged from the head 32.

<Problems with the conventional technology> However, in the above-mentioned equipment, the detector and sprinkler head are low sensitive to prevent them from malfunctioning due to the heat of the heating system, so the fire can spread to some extent. The problem was that it took time to extinguish the fire, and a large amount of water had to be released to extinguish the fire, resulting in a large paddy field. In order to cover these drawbacks, it is also possible to install a smoke detector instead of a heat detector, but in this case, depending on the indoor structure, ventilation flow, etc., the installation of the smoke detector may be difficult. In some cases, smoke did not flow into the fire, or it took a long time to flow, and even when the sprinkler head was opened, the fire extinguishing water was not released.

Means for Solving the Problems> In view of the above points, the present invention provides the above-mentioned solution to the liquid supply side of a liquid supply pipe equipped with a highly sensitive closed type sprinkler head for manufacturing equipment in restricted areas. A device that constantly pressurizes the inside of the pipe to a predetermined air pressure, a device that supplies fire extinguishing water to the pipe via a normally closed control valve, and a smoke detection device that detects smoke via a normally closed pressure response valve. A control valve is opened by the output of the smoke detection device.

<Operation> The fire extinguishing system of the present invention opens a highly sensitive closed sprinkler head at a fire point to guide air or smoke at this point to a smoke detection device, and opens a control valve based on the output of the smoke detection device. This prevents accidental release due to heat from heating equipment, etc., and water loss is reduced because the extinguishing collection water is released at a time when the fire intensity is smaller than in the past, and the fire is extinguished immediately.

<Example> Hereinafter, a case will be described in which an example of the fire extinguishing system of the present invention is installed in a clean room such as a semiconductor factory.

In Fig. 1, l is a room with downflow ventilation, 2 is semiconductor manufacturing equipment, 3 is a liquid supply pipe with extinguishing value ff,
4 is a highly sensitive closed sprinkler head, for example 5
It operates at 0° C. and is provided corresponding to semiconductor manufacturing equipment 2 and the like.

Reference numeral 5 denotes a pressurizing device that constantly pressurizes the inside of the pipe to a predetermined air pressure, and is composed of a compressor 6, a check valve 7, and an orifice 8. Reference numeral 9 denotes a control valve, which is provided between the liquid supply pipe 3 and the liquid feeding device 12 consisting of a pump lO and a motor 11, and the opening and closing of this valve is controlled by a solenoid valve 13. Reference numeral 14 denotes a smoke detection device, which is composed of an optical smoke detection section 15 and a fan 16 that sucks air or smoke into the detection section, and is connected to the liquid supply pipe 3 via a solenoid valve 17 as a normally closed pressure-responsive valve. be done.

Reference numeral 18 denotes a pressure switch that operates upon detecting a pressure drop in the liquid supply pipe 3, and is connected to a receiver panel 19. The receiving board 19 also includes the output of the smoke detection device 14, the solenoid valve 13°17, and the motor 1.
1 and the fan 16 are also connected through an electric circuit.

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

When the semiconductor manufacturing equipment 2 in room 1 overheats and a fire occurs, the hot air flow A heats the highly sensitive sprinkler head 4 directly above it, as shown in Figure 2, and the metal melts immediately. Ru. Since the diameter of the sprinkler head 4 is larger than the diameter of the orifice 8, the air pressure in the liquid supply pipe 3 decreases and the pressure switch 18 is activated. And receiver board 19
The electromagnetic valve 17 is opened via the valve, and the suction fan 16 is operated. As a result, the smoke rising on the hot airflow of the fire is guided to the smoke detection section 15 through the opened sprinkler head 4, the liquid supply pipe 3, and the solenoid valve 17. In this case, when smoke of a predetermined concentration flows in, the light irradiated to the light receiving section also changes by a predetermined amount, and a fire detection output is sent to the receiving board 19. When the receiving board 19 confirms that there is a fire due to the generation of heat and smoke, the receiving board 19 releases the solenoid valve 1.
3 is operated to open the control valve 9, and the liquid supply device 12 is operated, and the fire extinguishing water is immediately discharged from the sprinkler head 4 which has been opened. Therefore, fires are extinguished with a small amount of extinguishing water in their early stages. At this time, the solenoid valve 17 is closed again so that the fire extinguishing water does not flow into the smoke detection device 14.

<Effects> The fire extinguishing system of the present invention guides the air or smoke near the fire point to the smoke detection device by opening the highly sensitive closed sprinkler head at the fire point, and after confirming the fire with the smoke detection device, Since the control valve is opened, there is no possibility of accidental discharge due to heat from heating equipment, etc., and the fire extinguishing system has the effect of being able to release fire extinguishing water when the fire intensity is small and extinguish the fire immediately, resulting in less water damage than in the past. .

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a fire extinguishing system according to the present invention installed in a clean room of a semiconductor factory, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a schematic diagram of a conventional fire extinguishing system. 1... Room, 2... Manufacturing equipment, 3... Liquid supply pipe, 4...
...Closed sprinkler head, 5...Pressure device, 9
...Control valve, 12...Liquid feeding device, 14...Smoke detection device, 17...Solenoid valve as pressure response valve, 19...
・Receiver board. Patent l) Mother Nomi Disaster Prevention Industry Co., Ltd. Company I Figure 2

Claims (1)

[Claims] 1. A device that constantly pressurizes the inside of the pipe to a predetermined air pressure, on the liquid feeding side of a liquid supply pipe equipped with a highly sensitive closed sprinkler head for manufacturing equipment in restricted areas. , a device for supplying extinguishing water to the pipe via a normally closed control valve, and a smoke detection device for detecting smoke via a normally closed pressure-responsive valve, and the output of the smoke detection device causes the above to be detected. A fire extinguishing system that causes little water damage and is characterized by a control valve that is opened. 2. The fire extinguishing system with little water damage as claimed in claim 1, wherein the suction fan of the smoke detection device operates when the air pressure of the liquid supply pipe decreases. 3. The fire extinguishing system with little water damage according to claim 1, wherein the pressure response valve is a solenoid valve that is energized when the pressure of the liquid supply pipe decreases and is de-energized when the pressure increases.