Nozzle end-piece for hot guniting

An end piece for a guniting nozzle adapted to project a refractory powder through a flame, said nozzle having a passage for a combustion-sustaining gas, and a passage for a fuel gas entraining the refractory powder, said end piece comprising:

• an axially extending cylindrical inner pipe communicating at one end with said passage for said combustion-sustaining gas and provided with means forming a closure at an opposite end of said inner pipe;
• at least one circular array of tubes extending the length of said inner pipe and surrounding same, said array being coaxial with said inner pipe and the tubes of said array communicating with said passage for the fuel gas and refractory powder, said tubes being open and lying in a common plane at respective ends of said tubes substantially flush with said opposite end of said inner pipe;
• and
• an outer pipe coaxially surrounding said inner pipe and defining with said inner pipe interstices between said tubes opening at said plane, said inner pipe being provided along its length with a plurality of through-going bores connecting the interior of said inner pipe with said interstices whereby said fuel gas and refractory powder emerge from said tubes at said plane while said combustion-sustaining gas is delivered to said interstices and emerges from between said tubes at said plane.