MOUTHPIECE FOR FIRE HOSE NOZZLE Russian patent published in 2015 - IPC A62C31/02 

FIELD: fire safety.

SUBSTANCE: mouthpiece for fire hose nozzle consists of a housing with a conical and a nozzle cylindrical parts. Inside the housing a bluff body is mounted. The mouthpiece is additionally provided with a cylindrical pipe - nozzle orifice attached to the end conical part of the housing at an angle of slope A equal to 120°-170°. The length of the pipe - nozzle orifice L=1.2-2D1, where D1 is the inner diameter of the nozzle orifice, which is greater than the inner diameter of the conical part of the mouthpiece D due to which a ledge - a specific "redan" is created, which height is h=0.5-2 mm. Along the perimeter of the pipe - nozzle orifice the through injection holes are made, having the diameter d, equal to 1.5-3 mm, in amount of n, determined by the ratio n=3.14×D1/4. The through holes along the perimeter of the pipe - nozzle orifice in amount of n pieces are arranged strictly along the diameter of the nozzle orifice near the ledge - "redan".

EFFECT: reduction of the wetted surface and reduction of friction of water against the walls of nozzle orifice to increase the flow rate and flying range of the jet.

2 cl, 2 dwg