JPS631865B2 - - Google Patents

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 an electrical discharge machine.

In a machining liquid tank containing combustible materials such as insulating oil between electrodes in an electric discharge machine, there is always a risk of fire due to air discharge. However,
Because the machining liquid tank uses an overhead crane to take in and take out the workpieces, it is not only extremely difficult to provide a cover over the space above the liquid tank.
Since a processing table that supports the workpiece and equipment that controls the electrodes are usually placed above the processing liquid tank, the location 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 difficult. Not only does it get in the way, but it also has the disadvantage of increasing the burden on equipment as a fire extinguishing device. Furthermore, placing the discharge nozzle directly at the liquid surface of the machining liquid tank may cause the extinguishing gas to ripple the machining liquid surface or scatter the machining liquid when it is released, causing damage to equipment or spreading the flame. There is also a risk that it may encourage

Conventionally, as shown in FIG. 1, the discharge nozzle 4 is installed directly above the liquid tank 5 that is the object to be extinguished, or as shown in FIG. It is common to install the discharge nozzle 4 obliquely upward. 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 furthermore, the control equipment disposed above the processing liquid tank 5 and the This may cause damage to the table, etc.

If the discharge pressure from the discharge nozzle 4 is lowered in order to suppress the scattering of such extinguishing gas, the extinguishing gas discharging force will be weakened, which will not only lengthen the extinguishing gas discharge time, but also cause the extinguishing gas to be caused by the flame. There is a problem in that the extinguishing gas is also blown up by the rising heat current, significantly reducing the extinguishing ability.

In view of these problems, the purpose 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 quickly create an air curtain of gaseous extinguishing agent around combustible objects to improve fire extinguishing ability. It is an object of the present invention to provide a fire extinguishing device such as a combustible liquid tank which can be fully utilized.

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 examples, the third,
As shown in Fig. 4, a processing liquid tank 5 containing combustible materials
A pair of discharge nozzles 4 are disposed above the machining liquid tank 5 and facing each other on one side, and are connected to the extinguishing agent tank 2 through a conduit 3.
A control valve 10 attached to the fire extinguishing agent is opened manually or automatically based on a signal from a fire detector, and the extinguishing agent is spouted. The discharge direction of the discharge nozzle 4 is horizontal as shown in FIG.
It faces the top of a.

In the present invention, as described above, the pair of discharge nozzles 4 are arranged facing each other, so that when a fire occurs, the extinguishing gas discharged from the pair of discharge nozzles 4 is mutually transferred to the machining liquid tank 5.
They collide with each other in the upper space and spread into the upper space of 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 not be distributed locally because the extinguishing gas will be diffused by collision. Such parts do not occur.

This means that the upper side of the machining liquid tank 5 is effectively covered with extinguishing gas. In addition, the injection pressure of the extinguishing gas prevents air from entering from outside, so the machining liquid tank 5 is shielded by the extinguishing gas flow. Even if a fire occurs in the machining liquid tank 5, it can be quickly extinguished by such a film of extinguishing gas.

The above embodiment is the simplest example, but
As shown in FIGS. 5 and 6, the nozzles 4 may be opposed to each other by arranging the pair of left and right nozzles 4 so as to extend somewhat toward the inner side of the machining liquid tank 5 than the one side wall 5a.

Furthermore, as shown in FIG. 7, if the nozzles 4 facing each other are configured to be elongated nozzles extending along the depth direction of the processing liquid tank 5, the upper part of the extinguishing liquid tank 5 is A film of extinguishing gas instantly forms on the front, reducing the time it takes to extinguish the fire.

The embodiment shown in FIGS. 8 and 9 shows the arrangement of the discharge nozzles 4 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 processing is carried out by the collision of extinguishing gas discharged from the left and right pair of discharge nozzles 4. A gas film of extinguishing gas can be formed on the front surface of the table 6.

According to the present invention, since only one pair of discharge nozzles is provided, the piping is simple, and the machining liquid tank 5
It also does not interfere with the use of processing equipment or overhead cranes installed in the upper space. 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, the drawbacks of the conventional example in which flames blow out from the gaps in the air curtain of the extinguishing gas can be solved. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional fire extinguishing device such as a combustible liquid tank, FIG. 2 is a side view showing another example of the conventional fire extinguishing device, and FIG. 4 is a front view of a fire extinguishing device such as a liquid tank, FIG. 5 is a front view of a fire extinguishing device such as a flammable liquid tank according to the second embodiment of the present invention, and FIG. 6 is a plan view of the same. 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 front view of a fire extinguishing device such as a combustible liquid tank according to a fourth embodiment of the present invention. 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: Workpiece.

Claims (1)

[Claims] 1. 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 jetting direction of the discharge nozzles is set so that the extinguishing gas collides with each other in the center of the liquid tank and in a space above the liquid tank. A fire extinguishing device for a flammable liquid tank, etc., characterized by being oriented in the opposite direction.