JPS62139675A - Fire extinguisher - 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) The present invention relates to a fire extinguisher of the type that emits fire extinguishing foam from a nozzle.

(Conventional Technique #) As is well known, fire extinguishers that emit liquid extinguishing agents include water extinguishers, reinforced liquid extinguishers, and foam extinguishers.

A water fire extinguisher uses an aqueous solution of phosphates or water as an extinguishing agent, and emits this extinguishing agent in a rod shape from a nozzle.
It is effective against fires (ordinary fires in which solid combustible materials such as wood and paper burn), but cannot be used against B fires (oil fires).
In addition, since conductive extinguishing agent is emitted in a rod shape, C fire (
However, the above extinguishing agent that is sprayed in a mist form from a nozzle can be used for A and C fires, but cannot be used for B fires.

Reinforced liquid fire extinguishers use potassium carbonate aqueous solution as the extinguishing agent.
This extinguishing agent is emitted from a nozzle in the form of a rod or mist. Extinguishing extinguishers that emit extinguishing agent in the form of a stick are effective against fires for the same reason as the water extinguishers mentioned above, but B
On the other hand, those that emit extinguishing agents in the form of a mist can effectively extinguish B fires due to the negative catalytic effect (effect of suppressing the chain reaction of combustion) caused by the thermal decomposition reaction of potassium carbonate. It can also be used for C fires because it emits extinguishing agent onto the letter. Therefore, it can be used for all fires A, B, and C, but for fire B, even though it has the above-mentioned negative catalytic effect, the extinguishing agent does not have foaming properties, so it is necessary to gradually coat the oil surface. However, it has the disadvantage that it does not have the so-called covering property, which reduces the size of the burning surface and ultimately extinguishes the fire.

In addition, since the extinguishing agent is emitted in the form of a mist, the reach of the extinguishing agent is shortened, making it difficult for the user to approach the source of the fire in the event of a severe fire. In addition, the extinguishing agent is a concentrated aqueous solution of potassium carbonate, which is highly alkaline with a hydrogen ion concentration (pH value) of around 13, so if the extinguishing agent comes into contact with the human body, it can cause skin irritation. It is difficult to say that it is the most suitable fire extinguisher, as there is a danger in using it, such as damaging the mucous membranes of the eyes, nose, etc.

Foam fire extinguishers include chemical foam fire extinguishers and mechanical foam fire extinguishers. For chemical foam fire extinguishers, an aqueous solution of sodium bicarbonate (agent A) and an aqueous solution of aluminum sulfate (agent B) are separately filled in the outer and inner cylinders of the fire extinguisher, and when used, the two liquids are mixed and the chemical reaction takes place. This produces bubbles containing carbon dioxide. 1 Mechanical foam fire extinguishers are equipped with a foam nozzle with air suction holes in a pressure vessel filled with a fire extinguishing agent consisting of a fluorine-based surfactant, 2 a synthetic surfactant, and a phosphate, etc., and extinguish the fire with compressed air or nitrogen gas. In addition to pressurizing the drug, air is sucked in from the air suction hole during use to mechanically generate bubbles. Since these foam fire extinguishers have a fire-covering property that covers the object, which is the source of the fire, with foam, they can be safely used not only for A fires but also for relatively large fires, and can ensure reliable extinguishment. However, since the extinguishing agent is emitted in the form of a stick, it has a major drawback in that there is a risk of electric shock when used for C fires.

(Problems to be solved by the invention) In this way, conventional fire extinguishers include A fire, B fire, and C fire extinguisher.
There was no one that could be used safely for all types of fires and that could extinguish fires reliably, and each had its advantages and disadvantages. On the other hand, the reality is that the objects that are the sources of fires that have occurred in recent years are becoming more complex and diverse.

The present invention solves these problems.

It can be safely used for all A fires, B fires, and C fires.
Moreover, it is an object of the present invention to provide a fire extinguisher that can reliably extinguish a fire.

(Means for solving problems) In order to solve the above problems, the present invention provides a fire extinguisher.

It is characterized in that a fire extinguishing agent made of a neutral or nearly neutral foaming aqueous solution containing a fluorine-based surfactant is ejected from a nozzle that diffuses and emits the fire extinguishing agent in the form of particles.

(Function) The fire extinguisher with the above configuration is effective against A fire because the extinguishing agent has a cooling effect and the aqueous solution containing the fluorine-based surfactant has a lower surface tension than water and penetrates into paper and wood. Its rich properties work synergistically to exert great fire extinguishing ability. For B fires, the extinguishing agent emitted in granular form becomes foamy due to the impact when it hits the oil surface or the wall of the target object.
As in the case of the mechanical foam fire extinguisher described above, the foam quickly spreads over the oil surface and exerts a suffocation effect, promoting extinguishing the fire. For C fires, the extinguishing agent is dispersed into the air in the form of particles, similar to the case with the above-mentioned fire extinguishers that emit water or reinforcing liquid in the form of a mist. There is no risk of electric shock as it does not conduct electricity at voltage.

Furthermore, since the extinguishing agent is neutral or almost neutral, it is harmless even if it comes into contact with the human body.

(Example) DESCRIPTION OF THE PREFERRED EMBODIMENTS A fire extinguisher according to the present invention will be explained below with reference to the drawings.

The fire extinguisher illustrated in FIG. 1 has a pressure tank 1 filled with extinguishing agent 2, and when a lever 3 is operated, the extinguishing agent 2 that has passed through a hose 4 is diffused and emitted in granular form from a nozzle 5. . What is the pressure required to emit the extinguishing agent 2 from the nozzle 5?

Pressure tank! The method may be the well-known pressure accumulating method or the pressurizing method.
The fire extinguishing agent 2 consists of a neutral foaming aqueous solution containing a fluorine-based surfactant.

FIG. 2 illustrates a specific configuration of the nozzle 5. As shown in FIG.

The nozzle 5 shown in the figure has a large-diameter portion 51 in the middle of the internal passage, and an inlet 52 and an outlet 53 of the large-diameter portion 51 are formed to have small diameters. Then, from pose 4 to nozzle 5
While passing through the population 52, the extinguishing agent is adjusted to a constant flow rate and ejected to the large-diameter portion 51 at increased speed, and flows turbulently through the large-diameter portion 51 to the outside from the outlet 53. At this time, the extinguishing agent is dispersed in granular form. In order for the extinguishing agent to behave as described above, the population 52 should be smaller than the large diameter part 51, the outlet 53 should be smaller than the inlet 52, and the inlet 52 and the large diameter part 5 should be smaller.
It has been experimentally confirmed that the lengths of the inlet 52 and the outlet 53 are approximately the same, and the length of the large diameter portion 51 is longer than this. 52
By setting the ratio of the cross-sectional areas of the large-diameter portion 51 and the outlet 53 to 2:8:1, and setting the ratio of the lengths of the inlet 52, the large-diameter portion 51, and the outlet 53 to 1:10:1. It has been confirmed through experiments that the best results are obtained. The fire extinguishing agent emitted from the nozzle 5 spreads in granular form, increases its surface vegetation, becomes susceptible to foaming, and foams before or after reaching the object. In addition, since the resistance that the extinguishing agent receives within the nozzle 5 is very small, the kinetic moment given to the extinguishing agent dispersed and emitted from the nozzle 5 in granular form is not significantly reduced even after it exits the nozzle 5. The distance of the drug will be longer. As a result of the experiment, this range is 1.5 times greater than when the extinguishing agent is sprayed in a mist by using a nozzle with a spiral flow path in the conventional reinforced liquid fire extinguisher described in -. It has become ~2 times (5-8 m).

Note that the nozzle explained in FIG. 2 is an example, and any nozzle that can be employed in the fire extinguisher of the present invention may be used as long as it diffuses and emits the above-mentioned fire extinguishing agent in the form of particles.

(Effects of the Invention) As described above, the fire extinguisher of the present invention sprays a fire extinguishing agent made of a neutral or nearly neutral foaming aqueous solution containing a fluorine-based surfactant from a nozzle that diffuses and emits it in granular form. Therefore, it can be used for all fires A, B, and C, and the reach of the extinguishing agent is sufficiently long, so it can be used for fires such as fires in recent years, where the objects that are the source of fires have diversified. It can be used safely and has effective fire extinguishing ability. Moreover, the pressure tank of a ready-made accumulator type or pressurized type fire extinguisher can be used as is.

The extinguishing agent is a neutral or nearly neutral foaming aqueous solution containing a fluorine-based surfactant, and the nozzle is configured to diffuse and emit the extinguishing agent in granular form, making it easy to replace conventional fire extinguishers. It also has the advantage of being modifiable.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing a fire extinguisher of the present invention, and FIG. 2 is a sectional view showing an example of a nozzle. 2...Extinguishing agent 5...Nozzle patent applicant Agent of Yamato Fire Extinguisher Co., Ltd.
Patent attorney Takashi Suzue - Figure 1

Claims (1)

[Claims] (1) A fire extinguisher characterized in that a fire extinguishing agent made of a neutral or nearly neutral foaming aqueous solution containing a fluorine-based surfactant is ejected from a nozzle that diffuses and emits the fire extinguishing agent in the form of particles.