JPS6060864A - Fire extinguishing apparatus of combustible liquid tank - 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 The present invention relates to a fire extinguishing system using a gaseous fire extinguishing agent such as carbon dioxide gas or halon, and particularly to a local fire extinguishing system for a liquid tank containing combustible materials such as electrical discharge machining materials.

In a machining fluid tank containing flammable materials such as insulating oil between electrodes in an electric discharge machine, there is always a risk of fire due to air discharge. However, since the machining liquid tank uses an overhead crane to take in and out the workpieces, it is not only very difficult to install a cover over the space above the liquid tank, but also allows the workpieces to be placed above the machining liquid tank. Since a supporting processing table and equipment for controlling the electrodes are usually arranged, the place where the extinguishing gas discharge nozzle can be installed is naturally limited. In other words, hanging a fire extinguishing gas discharge nozzle from the ceiling above the processing liquid tank will impede the use of an overhead crane, and arranging a large number of discharge nozzles surrounding the liquid tank will also make work easier. Not only does it get in the way, but it also increases the burden on the IiQ (1! The gas causes the machining fluid surface to ripple or the machining fluid to scatter,
There is a risk of damaging property or promoting the spread of flames.

Conventionally, as shown in FIG. 1, a discharge nozzle 4 is installed directly above the liquid 4, which is the object to be extinguished, or a processing table 6 that supports a workpiece 8 and equipment 7 is installed as shown in FIG. It is common to install the discharge nozzle 4 diagonally above. However, when extinguishing gas is released toward combustible materials from directly above or diagonally above the object to be extinguished, the combustible materials are scattered due to the gas pressure, and the control equipment and processing table located above the processing liquid tank 5 may be damaged. This may lead to damage such as

In order to suppress the scattering of such extinguishing gas, the discharge nozzle 4
If the discharge pressure is lowered, the extinguishing gas discharging force will be weakened, which will not only lengthen the extinguishing gas release time, but also cause the extinguishing gas to be blown up by the thermal updraft caused by the flame, significantly reducing the extinguishing ability. There is a problem with reducing it.

In view of these problems, the object of the present invention is to discharge a gaseous extinguishing agent with a small number of discharge nozzles that are easy to install, and at the same time,
To provide a fire extinguishing device such as a combustible material liquid liner capable of quickly forming a film of gas-based fire extinguishing agent around the combustible material and fully exhibiting its fire extinguishing ability.

For this reason, the configuration of the present invention is that in a fire extinguishing device for a liquid tank containing combustible materials, a pair of discharge nozzles for discharging extinguishing gas are disposed on one side of the liquid tank, and the ejection direction of the discharge nozzles is set to the The extinguishing gases are oriented so that they collide with each other in the center of the liquid tank and in the space above the liquid tank.

To explain the present invention based on an embodiment, as shown in FIG. Nozzle 4
This is connected to the extinguishing agent tank 2 with a conduit 3, and the control valve 10 attached to the extinguishing agent tank 2 is opened manually or automatically based on a signal from a fire detector to spray out the extinguishing agent. Configure. The discharge direction of the discharge nozzle 4 is horizontal, as shown in FIG. 3, and faces the upper part of one side wall 5a of the liquid tank 5.

In the present invention, the pair of discharge nozzles 4 are arranged opposite each other as described above, so that when a fire occurs, the extinguishing gas discharged from the pair of discharge nozzles 4 collides with each other in the space above the processing liquid tank 5. It spreads into the space above the machining liquid tank 5. Therefore, even if a predetermined processing device or the like is installed above the processing liquid tank 5, the extinguishing gas will be diffused by the III bump, so there will be areas where the extinguishing gas does not reach locally. does not occur.

This means that the extinguishing gas effectively covers the upper side of the machining liquid tank 5, and the jetting pressure of the extinguishing gas prevents air from entering from the outside, so that the machining liquid tank 5 is shielded by the extinguishing gas flow. Due to such vapors of extinguishing gas, processing liquid tank 5
Even if a fire occurs, it can be extinguished quickly.

The above embodiment is the simplest example, but the fifth and sixth embodiments
As shown in the figure, the nozzles 4 may be opposed to each other by arranging the pair of left and right nozzles 4 so as to protrude somewhat toward the inside of the machining liquid tank 5 from one side wall 5a.

Further, as shown in FIG. 7, nozzles 4 facing each other
If configured to use a long nozzle extending along the depth direction of the machining liquid tank 5, extinguishing gas! Due to the impact, a film of extinguishing gas is instantaneously formed on the front surface of the upper part of the extinguishing liquid 115.
It can shorten the fire extinguishing time.

In an actual example not shown in FIG. 8.9, the arrangement of the discharge nozzles 4 is shown when the processing table 6 is arranged in multiple stages. In this embodiment, a pair of elongated discharge nozzles 4 that are adjacent to the front surface of the processing shelf and extend vertically on both sides are disposed, and the collision of extinguishing gas discharged from the left and right pair of discharge nozzles 4 causes the processing table to A film of extinguishing gas can be formed in front of the

According to the present invention, since only one discharge nozzle is disposed, the piping is simple and does not obstruct the use of processing equipment or an overhead crane disposed in the space above the processing liquid tank 5. Not even. Furthermore, since the extinguishing gas is spread over the entire surface of the machining liquid tank by the processing equipment placed in the machining liquid tank, it is possible to eliminate the drawbacks of the conventional method, such as flames blowing out from the gaps in the extinguishing gas curtain. .

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional fire extinguishing system such as a combustible liquid tank, and Fig. 2 is a side view showing another example of a conventional fire extinguishing system.
FIG. 3 is a front view of a fire extinguishing device such as a combustible liquid tank according to the first embodiment of the present invention, FIG. 4 is a plan view of the same, and FIG. 5 is a combustible liquid tank according to the second embodiment of the present invention. Front view of fire extinguishing equipment, such as
FIG. 6 is a plan view of the same, FIG. 7 is a plan view of a fire extinguishing device such as a combustible liquid tank according to a third embodiment of the present invention, and FIG. 8 is a plan view of a combustible liquid tank according to a fourth embodiment of the present invention. Front view of fire extinguishing equipment, such as
FIG. 9 is a plan view of the same. 2: Extinguishing agent tank 3: Conduit 4: Discharge nozzle 5: Processing liquid tank 6: Processing table 8: Processed product patent applicant Nippon Fenol Co., Ltd. Representative Patent attorney Toshio Yamamoto Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] In a fire extinguishing system for a liquid tank containing combustible materials, a pair of discharge nozzles for discharging extinguishing gas are arranged on one side of the liquid tank, and the ejection direction of the discharge nozzles is directed toward the center of the liquid tank and toward the center of the liquid tank. A fire extinguishing device for a combustible liquid tank or the like, characterized in that the fire extinguishing gases are oriented so that they collide with each other in a space above the tank.