MULTIFUNCTIONAL FIREFIGHTING VEHICLE EQUIPPED WITH A SPRAYER FOR LIQUID NITROGEN AS A FIRE EXTINGUISHING AGENT Russian patent published in 2021 - IPC A62C27/00 A62C31/02 B05B7/04 A62C31/07 

FIELD: firefighting.

SUBSTANCE: multifunctional firefighting vehicle utilising the energy of liquid nitrogen, including a vehicle frame (1), a liquid nitrogen storage tank (2), a liquid nitrogen supply pipeline (9), a gasification apparatus (15), a spray gun for liquid nitrogen (13), a water supply unit (12) and a mixing spray gun (8); liquid nitrogen is mixed with water in the mixing spray gun (8), the liquid nitrogen quickly absorbs the heat of the water and is quickly gasified, the volume thereof increases by a factor of hundreds, while creating thrust; thus, water is ejected at a high speed in the form of sprayed liquid, and the sprayed liquid increases the area of contact of the fire extinguishing agent with the flames, thereby increasing the efficiency of fire extinguishing; and also provided is a mixing spray gun (8) containing a first input end, a second input end, a nozzle for liquid nitrogen (8-4) and a spraying pipe, wherein the compression section (8-1), the expansion section (8-2) and the acceleration section (8-3) are separated and connected in the inner cavity of the jet pipe in accordance with the direction of the flow of the "gas-liquid" mixture; the nozzle for liquid nitrogen (8-4) is connected with the first input end, and an output hole of the nozzle for liquid nitrogen is on the same level with the output of the compression section (8-1); the second input end is connected with the compression section (8-1), and the other end is connected with the water supply connection (12); using the mixing spray gun (8), the kinetic energy generated by changing the heat absorption phase can be utilised when liquid nitrogen is mixed with water, and water can be ejected at a high speed in the form of sprayed liquid, and can simultaneously prevent the occurrence of "air locking" due to the sharp increase in the volume when liquid nitrogen is gasified in the mixing spray gun (8).

EFFECT: provided possibility of extinguishing fires by utilising the energy of liquid nitrogen.

10 cl, 5 dwg