Compressed air foam extinguishing agent spraying gun and method thereof

A technology of compressed air foam and foam fire extinguishing agent, which is applied in fire rescue and other fields, can solve problems such as difficult to realize, foam fire extinguishing device and cart-type foam fire extinguisher, etc. high speed effect

Active Publication Date: 2013-04-03
中国人民解放军海军装备技术研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, currently fixed on the foam fire extinguishing agent spray guns and fire extinguishing agent delivery pipelines in various areas such as ships, ships, and aircrafts, and on the cart-type aqueous film-forming foam fire extinguisher spray guns, a complex structure of compressed air controlled by a computer is installed. Proportional mixer and foaming device with foam fire extinguishing fluid will make the structure of foam fire extinguishing device and cart-type foam fire extinguisher bulky and difficult to realize

Method used

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  • Compressed air foam extinguishing agent spraying gun and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] When the compressed air foam fire extinguishing agent spray gun of the present invention is used on a trolley-type non-pressurized water film-forming foam fire extinguisher, the hose for outputting the foam extinguishing agent on the fire extinguisher tank is connected to the foam extinguishing agent input connector 1 of the spray gun. The output hose of the air tank is connected with the air inlet connector 12 after being decompressed by the pressure reducer. Turn on the trigger 3 with the transmission gear. After the high-pressure air from the compressed gas cylinder is reduced to 0.8-1.0 MPa by the pressure reducer, a route air inlet connector 12 enters the ball valve 11 with the transmission gear and the air pipeline 8 and flows When passing the convergent nozzle 5, the rate of fire is increased, but the outlet diameter of the convergent nozzle 5 is small, which limits the gas flow to 15-20 liters / sec. Another compressed air is input into the foam fire extinguisher ta...

Embodiment 2

[0029] The compressed air foam fire extinguishing agent spray gun of the present invention, when used as a hand-held fire extinguishing agent spray gun for firefighters, supplies compressed air with a pressure of 0.8 to 1.0 MPa from a vehicle-mounted or ship-borne air compressor and enters it into the air inlet connector 12; The diluted aqueous film-forming foam fire extinguishing agent with a pressure of 0.8-1.0 MPa is input into the foam fire-extinguishing agent connector 1, and the trigger 3 with the transmission gear is turned on. The diluted aqueous film-forming foam fire extinguishing agent flows through the "Laval tube" The gap of the spray channel formed between the barrel 7 and the convergent nozzle 5, when the gap of the spray channel is 4.5 mm, the flow rate of the aqueous film-forming foam fire extinguishing liquid is maintained at about 2.0 kg / sec; the convergent nozzle 5 compresses The air flow rate is maintained at 60 to 70 liters per second, and the spray distanc...

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PUM

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Abstract

The invention discloses a compressed air foam extinguishing agent spraying gun and a method thereof. Foam extinguishing agent liquid is sprayed out of an annular spraying channel which is positioned at an inlet of an extinguishing agent spraying gun pipe and is tightly attached to the wall surface to form a flowing liquid film attached to the wall; under impact and cutting of high-speed air flow injected by a convergence-shaped nozzle in the center of the inlet of the extinguishing agent spraying gun pipe, the liquid film is damaged; under the action of surface tension, the liquid film is contracted and wraps compressed air for cutting the liquid film, so that a plurality of air foam balls are generated, and foam extinguishing agent liquid becomes high-speed flowing compressed air foams; and the compressed air foams are accelerated in a 'laval nozzle' type gun pipe and then sprayed at high speed. By the compressed air foam extinguishing agent spraying gun and the method thereof, the compressed air and the foam extinguishing agent are mixed in a gun body to generate the compressed air foam which is sprayed at high speed; fuel fire can be quickly extinguished, and reignition is avoided; fire with the same intensity can be extinguished; and a large number of foam extinguishing agents can be saved.

Description

Technical field [0001] The invention belongs to the technical field of fire fighting, and particularly relates to a spray gun for compressed air foam fire extinguishing agent. Background technique [0002] Aqueous film-forming foam fire extinguishing agent (AFFF) is sprayed from the fire squirt and spread on the oil surface to form a water film that floats on the oil surface and is lighter than fuel (gasoline, diesel, aviation kerosene), and isolates the fuel from the air The flame goes out, so it is also called "light water foam fire extinguishing agent". The multi-purpose fire water gun has a good effect of dispersing the aqueous film-forming foam fire extinguishing agent into a water film. In view of its excellent characteristics, the navies of various countries use multi-purpose water guns and embedded extinguishing agent nozzles to spray aqueous film-forming foam fire extinguishing agents when fighting ships and carrier aircraft fires. However, the water film after injecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62C31/02A62C5/02
Inventor 王戈姬永兴袁晓芳
Owner 中国人民解放军海军装备技术研究所
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