JP2001137376A - Fire-extinguisher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a foam fire extinguisher with nitrogen gas. SOLUTION: Nitrogen gas under a foam state is discharged from this fire- extinguisher by enclosing nitrogen gas which prevents fire from combusting, in foams generated by a foam fire-extinguisher.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a fire extinguisher,
In particular, it relates to a foam fire extinguisher in which nitrogen gas is confined inside the foam.

[0002]

2. Description of the Related Art A conventional foam fire extinguisher is a chemical foam fire extinguisher in which a foaming action is caused by a chemical reaction between an agent A and a agent B, and at the same time, carbon dioxide is generated and bubbles are emitted at the pressure of the carbon dioxide. And mechanical foam extinguishers using foam extinguishing agents such as water film foam and synthetic surfactant foam newly introduced by the revision of the Ordinance of the Ministry of Standards in 1973. In both of these fire extinguishers, the fire extinguishing action is performed by blocking oxygen with a foam film.

[0003]

According to the above-mentioned conventional chemical foam fire extinguisher, there is a problem that a large amount of carbon dioxide which causes global warming is released. In a mechanical foam fire extinguisher, since the inside of the foam is air, when the foam film bursts, oxygen is released, and this amount of oxygen assists combustion, thereby hindering fire extinguishing.

[0004] On the other hand, it has been known that nitrogen gas is effective for extinguishing fire, but nitrogen gas is slightly lighter than air and thus scatters before reaching a fire source. Therefore, it has not been used for fire extinguishers.

[0005]

Means for Solving the Problems The nitrogen gas is released together with the foam by confining the nitrogen gas that hinders the burning of fire inside the foam. As a result, nitrogen gas and the like that have been scattered in the past can be delivered to the fire source. When the bubbles disappear, the result is that nitrogen gas is sprayed on the fire source, so that combustion is prevented and a high fire extinguishing effect can be expected.

[0006]

FIG. 4 is a block diagram showing a basic configuration of a fire extinguisher according to the present invention. The fire extinguisher includes a medicine storage section 13 for storing a medicine, a nitrogen gas supply section 1 for supplying high-pressure nitrogen gas, and a high-pressure supply of the medicine stored in the medicine storage section 13 and the nitrogen gas supply section 1. It comprises a mixing section 12 for mixing nitrogen gas, and a discharge section 14 for discharging the medicine and nitrogen gas mixed by the mixing section 12 in the form of bubbles.

FIG. 1 shows an example of a fire extinguisher using the present invention. The nitrogen gas supply unit 1 includes a liquid nitrogen tank 9, a vaporizer 10 and a valve 8. When the valve 8 is opened, the liquid nitrogen in the liquid nitrogen tank 9 becomes the nitrogen gas 2 in the vaporizer 10. The nitrogen gas 2 is vigorously injected into the pipe 3 constituting the mixing section 12. At this time, since this pipe 3 has the same configuration as the Venturi pipe,
By the Venturi action, the medicine (surfactant) 4 stored in the container 7 forming the medicine storage section 13 is blown off by the nitrogen gas 2 and the net 5 forming the discharge section 14 is formed.
(See FIG. 3), it is released as a foam.

FIG. 2 is an example of another embodiment of a fire extinguisher using the present invention. The nitrogen gas supply unit 1 is the same as the embodiment shown in FIG. 1, but has a configuration in which the medicine storage unit 13 and the mixing unit 12 are integrated in this embodiment. In this embodiment, when the nitrogen gas 2 is sent from the pipe 3 to the medicine (surfactant) 4 stored in the container 7 through the net 5, nitrogen gas bubbles 6 are generated inside the container 7. After the foam 6 is filled in the container 7, the foam 6 is discharged to the outside from the discharge port 11.

[0009]

According to the present invention, nitrogen gas has been conventionally used as a pressurized material in a fire extinguisher, but according to the present invention, it can be directly used as a fire extinguisher. In addition, when nitrogen gas is used, a higher fire extinguishing effect can be expected as compared with a conventional mechanical foam extinguisher in which air is trapped inside foam. Since nitrogen gas is used instead of carbon dioxide, it can be said to be an excellent foam fire extinguisher in terms of the global environment.

[Brief description of the drawings]

FIG. 1 is a block diagram of a fire extinguisher according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a fire extinguisher according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a net 5;

FIG. 4 is a block diagram showing a basic configuration of a fire extinguisher according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nitrogen gas supply part 2 Nitrogen gas 3 Pipe 4 Fire extinguishing agent (surfactant) 5 Net 6 Foam 7 Container 8 Valve 9 Liquid nitrogen 10 Vaporizer 11 Discharge port 12 Mixing part 13 Chemical storage part 14 Discharge part

Claims (4)

[Claims] 1. A fire extinguisher characterized in that bubbles generated from a medicine are discharged in a state in which nitrogen gas is confined inside. 2. A drug storage unit for storing a drug, a nitrogen gas supply unit for supplying a high-pressure nitrogen gas, a drug stored in the drug storage unit, and a high-pressure nitrogen gas supplied from the nitrogen gas supply unit. A fire extinguisher, comprising: a mixing section that mixes the gas and nitrogen; and a discharge section that discharges the medicine and the nitrogen gas mixed by the mixing section in a foamed state. 3. The fire extinguisher according to claim 2, wherein the mixing section has a venturi mechanism. 4. The fire extinguisher according to claim 2, wherein the discharge section has a discharge port for discharging the medicine and the nitrogen gas mixed by the mixing section, and the discharge port has A fire extinguisher having an attached mesh member.