JPS63277068A - Fire extinguishing and fire spreading preventing method - 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 FIELD OF INDUSTRIAL APPLICATION This invention relates to a method for extinguishing the source of a fire or for preventing the spread of fire to adjacent buildings.

Conventional technology Conventionally, when a fire extinguisher containing nonflammable gas is used to extinguish a house fire in a relatively small space, it is suitable for localized extinguishing because the spray range is narrow, but it is not suitable for fires that have spread indoors. Unable to respond, the fire was extinguished by cooling with water. Additionally, as a measure to prevent the spread of fire to neighboring houses, it was common practice to cool the exterior walls with water.

Problems that the invention aims to solve However, in such fires, water is sprayed from outside to cool and extinguish the indoor area, but the area of water sprayed from the nozzle is small, so it is equivalent to extinguishing the burning part that has ignited over a wide area. It was taking time. In addition, modern houses still have very few openings, so it is not easy to spray water in the desired location because the outer wall becomes an obstacle.Furthermore, after the fire has been extinguished, the remaining fixtures become soaked with water, causing serious damage. there were. As mentioned above, the small number of openings can be an obstacle to extinguishing fires with water, but it also has the advantage of being able to extinguish fires by suffocation by simply blocking a few openings.

Measures to solve the problem In view of this, it is recommended to cover the fire source or the opening of the house where the fire is likely to spread by layering sheets or coating it with adhesive so that it will not break even if the glass breaks. Non-flammable gas is released in a plane to create a partition between the outdoors and indoors to cut off ventilation, and the indoor space is filled with non-flammable gas such as gas or carbon dioxide generated from liquid nitrogen released into the room by any means. Use non-flammable gas to make indoor air pressure higher than outdoor atmospheric pressure.

The conditions for ignition to ignite are the simultaneous presence of a combustible substance, a heat source, and oxygen to support combustion. It is said. In other words, there are flammable materials and heat sources indoors at the same time.
Even if oxygen is present, if the oxygen is diluted below a certain level or is in an oxygen-deficient state, the exterior walls will be scorched, but ignition indoors can be avoided and the coating of the house can be kept to a minimum. I can do it. In addition, by pressurizing the indoor space with nonflammable gas, oxygen, which is a combustible substance, is removed from the indoor space, and air is prevented from entering from the outside due to convection, making fire extinguishing by suffocation more effective. .

As described above, by pressurizing the indoor area with nonflammable gas, air from outside is prevented from entering, and the IIF combustible materials in the indoor area are also covered with gas, so the combustible materials are not temporary. The flash phenomenon can be prevented even if the temperature is higher than the ignition temperature (ECI) due to the continuous disconnection. In addition, the fire can be extinguished more quickly than the conventional cooling fire extinguishing method using water spray, and the enormous amount of water exposure caused by water spray can be eliminated.

Because no flash phenomenon occurs, rescuing people inside a house during a fire, which was previously considered difficult, becomes possible by using the Kamisha Speed C2, which is equipped with heat and respiratory protection personnel.

In other words, if you move around the area in the direction of travel while discharging liquid nitrogen from the nozzle, you can move forward while cooling it one by one, making it possible not only to fight suffocation and extinguish the fire by cooling, but also to create a rescue route and open the way to rescue measures.

Claims (1)

[Claims] A fire extinguishing or prevention method characterized by sealing the source of the fire or openings in adjacent buildings, and then filling or pressurizing the interior with nonflammable gas.