Patent ID: 6923385

Claim:
Nozzle for mixing at least two fluid substances together for coating a surface with the mixture of said fluid substances or with their reaction product or, optionally, with a reaction product of the aforesaid substances and the surface to be coated with them, said nozzle ( 1 ) comprising substantially concentric inner and outer channels ( 4 , 8 ) each for one of said at least two fluid substances, at least one channel ( 6 , 10 ) for gaseous medium, and orifices ( 4 ′, 8 ′) of channels ( 4 , 8 ) which are disposed close to each other at the end of the nozzle ( 1 ), characterized in that between the concentric channels ( 4 , 8 ) for fluid substances to be mixed with each other, one of said at least one channel ( 6 , 10 ) for gaseous medium is arranged as a substantially concentric intermediate channel ( 6 ), connected to a pressure source ( 12 ) for the gaseous medium, and the end of the intermediate channel ( 6 ) connected to the pressure source ( 12 ) for the gaseous medium has a conically or curvedly tapering form and a sharp edge and is directed obliquely towards the center axis of the nozzle ( 1 ), and that the diameter of an orifice ( 6 ′) of the intermediate channel ( 6 ) is smaller or equal to the inner diameter of said intermediate channel ( 6 ) before the tapering point, and the orifice ( 6 ′) of the intermediate channel ( 6 ) extends father than the orifice ( 4 ′) of the inner channel ( 4 ).