DIRE-EXTINGUISHING PLANT Russian patent published in 2007 - IPC A62C13/00 

FIELD: fire-fighting, particularly fire-extinguishing means using fire-extinguisher generated as two-phase gas-and-droplet flow.

SUBSTANCE: fire-extinguishing device comprises at least one fire-extinguishing liquid vessel, at least one compressed gas cylinder, gas pressure regulator, connection hose system and directed gas-and-droplet flow generation means. The gas-and-droplet flow generation means includes body, controlled liquid and gas delivery valves, mixing chamber for gas and liquid mixing made as cylindrical channel and gas-dynamic nozzle. Cylindrical bush is installed in the mixing chamber. Cylindrical bush is arranged in the body so that annular liquid delivery gap is created between the bush and body wall. The annular gap provides tangential liquid inlet. Inner bush surface defines cylindrical mixing chamber channel. Slot-like injection orifices are created in the bush. The slot-like orifices are directed transversely to axis of symmetry defined in cylindrical channel of mixing chamber. Slot-like orifice widths are not more than 0.07D, where D is inner bush diameter. Bush section provided with injection orifices has length L₀ measured along cylindrical channel, wherein the length L₀ is selected from the following condition: D≤L₀≤2D. Summary throat area of slot-like orifices S_or is not less than 0.01S_in, where S_in is inner bush surface area. The slot-like orifices are spaced equal distances along axis of cylindrical channel symmetry.

EFFECT: decreased fire-extinguishing liquid losses, increased spatial uniformity and stability of generated fine gas-and-droplet flow.

7 cl, 2 dwg