JP2008119169A - High expansion foam extinguishing facility and its foaming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a foaming ratio from being degraded in a high expansion foam extinguishing facility used in a pit of an oil tank, a culvert of an oil industrial complex, a cabin or a boathouse or the like and its foaming method. <P>SOLUTION: The high expansion foam extinguishing facility comprises a foaming part 3 provided with a net 7 for foaming and radiation nozzles 9 and an air suction part 5 for supplying air in a discharge section 1 to the foaming part 3. The air suction part 5 is provided with a purification foam generator 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a high expansion foam fire extinguishing equipment and a foaming method thereof used in oil tank pits, oil complex culverts, cabins, holdhouses, and the like. The present invention relates to an expanded foam fire extinguishing equipment and a foaming method thereof.

  In the foam fire extinguishing equipment, the foam aqueous solution is discharged from the radiation nozzle, blown into the foaming net and blown in by sucking air, and the fire source is filled with the foam to extinguish the suffocation. The foam fire extinguishing equipment includes a low foaming fire extinguishing equipment and a high foaming (high expansion) fire extinguishing equipment.

  In both the fire extinguishing facilities, the expansion ratio is different, for example, the expansion ratio of the low expansion fire extinguishing facility is 20 or less, and the expansion expansion ratio of the high expansion fire extinguishing facility is 80 or more and less than 1000. Here, the expansion ratio refers to the volume ratio between the aqueous foam solution and the generated foam.

  In order to generate highly expanded bubbles, for example, bubbles with an expansion ratio of 500 or more, it is necessary to take in a large amount of air from the upstream side of the radiation nozzle. The method (called “outside air”) is generally used.

  However, in this outside air, since the air of the part is used, a duct is provided in the building, or a bubble generator is provided by making a hole in the partition wall. is there.

  Therefore, in order to solve the above problem, a high-expansion foam fire extinguishing equipment of a system (referred to as “inside air”) that sucks air in a compartment that discharges bubbles is used (for example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 6-165837

  In the inside air high expansion foam fire extinguishing equipment, the foaming ratio may not be as designed depending on the chamber and amount of smoke generated at the time of the fire. For example, when the designed foaming ratio is 500, the actual foaming ratio is 100. When the expansion ratio is reduced in this manner, it is impossible to completely cover the fire source with the bubbles, so that the suffocation can not be effectively performed. The reason why the expansion ratio is lowered will be described in detail later, but it is mainly the presence of smoke in the air.

  In view of the above circumstances, an object of the present invention is to prevent a reduction in expansion ratio.

  The present invention is a high expansion foam fire extinguishing equipment comprising a foaming part having a radiation nozzle and an air suction part for supplying air from the radiation section to the foaming part; A foam generator is provided. The purification bubble generator according to the present invention is a low expansion bubble generator.

  The present invention provides a high-expansion foam fire extinguishing equipment that discharges an aqueous foam solution from a radiation nozzle in the foaming part and collides with a foaming net while supplying air from the discharge section sucked from the air suction part to the foaming part. A foaming method is characterized in that a foam wall is formed by a purification foam generator provided in the air suction part, and suction air is supplied to the foaming part through the foam wall.

  The present invention is characterized in that an aqueous foam solution in which a foam wall is formed is collected and reused as an aqueous foam solution for a radiation nozzle of the foaming portion.

  Since this invention was comprised as mentioned above, clean air is supplied to a foaming part. Therefore, since a reduction in the expansion ratio can be prevented, stable foaming performance can be obtained and fire extinguishing can be performed effectively.

  The present inventor researched and experimented on the cause of the decrease in the expansion ratio of the high expansion foam fire extinguishing equipment, and found that "smoke" had the main cause. This smoke is generated in the chamber (foam discharge section) due to the occurrence of a fire, but floats in the room as liquid fine particles, for example, fine particles having a particle diameter of 0.1 μm. These fine particles are supplied to the foaming part together with the air when the indoor air is sucked by the air suction part, and the foaming ratio is lowered.

Therefore, the present inventor considered that the problem could be solved by supplying clean air from which smoke was removed to the foaming portion, and conducted research and experiments on the means and the like.
As a result, it is only necessary to provide a foam generator for purification in the air suction part that supplies the air in the discharge section to the foaming part to form a foam wall, and supply the suction air to the foaming part through the foam wall. I understood. The present invention has been made based on the above findings.

A first embodiment of the present invention will be described with reference to FIG.
A room (chamber) 1 which is a foam discharge section is provided with a highly expanded foam fire extinguishing equipment. This fire extinguishing equipment has, for example, a foaming ratio of 500, and includes a cylindrical foaming part 3 and an air suction part 5 that supplies air to the foaming part 3.

  A foaming net (net) 7 is stretched at the tip of the foaming portion 3, and a plurality of radiation nozzles 9 are provided at the center thereof. The radiating nozzle 9 is disposed to face the net 7 and is connected to a mixer (not shown) that generates an aqueous foam solution.

  The air suction part 5 is formed by a duct having the same diameter as the foaming part 3, and a purification foamer 10 is provided at the inlet thereof.

The purifying foam generator 10 is a low expansion foam generator having the same structure as the foaming unit 3, and is provided with a foaming net (net) 17 and a plurality of radiation nozzles 19.
The radiating nozzle 19 is disposed to face the net 7 and is connected to a mixer (not shown) that generates an aqueous foam solution. In the foam generator 10, for example, a foam foaming ratio of 10 is employed.

Next, the operation of this embodiment will be described.
When a fire occurs in the room 1, a fire detector (not shown) detects the fire and sends a fire signal to the control panel.
Then, since the control panel activates the high expansion foam fire extinguishing equipment, the indoor air K is sucked from the air suction section 5 and the foam aqueous solution w is discharged from the radiation nozzle 9, and the foam aqueous solution w While colliding with 7, the air is sucked and foamed while being refined. Since the bubbles fall toward the fire source and cover the fire source, suffocation fire extinguishing, cooling fire extinguishing and the like are performed.

  At this time, smoke H based on a fire is generated in the room 1, and this smoke H is sucked together with the indoor air K into the air suction unit 5. A purification foamer 10 is provided. Therefore, when the foaming device 10 is driven, the foam aqueous solution w is released from the radiation nozzle 19, the foam aqueous solution w collides with the foaming net 17, is refined, sucks the air K containing the smoke H, and foams. The cleaning foam 22 is obtained.

  Since this cleaning bubble 22 spreads in the air suction part 5 and becomes like a wall (bubble wall), the air K containing the smoke H passes while contacting the bubble wall, and the smoke H It is caught in the washing bubble 22. Therefore, the foaming part 3 does not contain liquid fine particles (smoke), or air K containing only a slight amount of smoke is supplied, so a reduction in the expansion ratio can be suppressed. Can be extinguished efficiently.

A second embodiment of the present invention will be described with reference to FIG. 2. The same reference numerals as those in FIG. 1 have the same names and functions.
The difference between this embodiment and the above-described embodiment is that the cleaning foam 22 is recovered to form a foam aqueous solution, which is supplied to the radiation nozzle 9 of the foaming portion 3 and reused.
That is, the lower part of the air suction part 5 is connected to the main pipe 30 via the pump P. The main pipe 30 is a pipe that supplies a foam solution to the radiation nozzle 9 of the foaming unit 3.

  According to experiments, it has been found that even when a foam aqueous solution containing smoke is supplied to the radiating nozzle 9, the expansion ratio is not lowered. By reusing the foam solution that has been once foamed in this manner, the amount of the aqueous foam solution used can be reduced, which is a great economic advantage.

It is a front view which shows 1st Example of this invention. It is a front view which shows 2nd Example of this invention.

Explanation of symbols

1 room 3 foaming part 5 air suction part 7 foaming net 9 radiation nozzle 10 purifying foamer K air H smoke

Claims (4)

A high expansion foam fire extinguishing equipment comprising a foaming part having a radiation nozzle and an air suction part for supplying air from the discharge section to the foaming part;
A high-expansion foam fire extinguishing system, wherein a purification foam generator is provided in the air suction part.   The high expansion foam fire extinguishing equipment according to claim 1, wherein the purification foam generator is a low expansion foam generator. This is a foaming method for a high expansion foam fire extinguishing equipment in which air in the discharge section sucked from the air suction part is supplied to the foaming part, and the foam aqueous solution is discharged from the radiation nozzle in the foaming part to collide with the foaming net. And
A foaming method for a high expansion foam fire extinguishing system, wherein a foam wall is formed by a purification foam generator provided in the air suction part, and suction air is supplied to the foaming part through the foam wall.   The foaming method for a high expansion foam fire-extinguishing equipment according to claim 3, wherein the foam aqueous solution forming the foam wall is collected and reused as a foam aqueous solution for a radiation nozzle of the foaming part.

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