Patent ID: 7258831

Claim:
Injector-burner comprising a cylindrical body ( 3 ) defining a first longitudinal axis ( 6 ), the cylindrical body comprising a first central duct ( 8 ) arranged along said first axis ( 6 ), at least one second ring-shaped duct ( 10 ), arranged around said first central duct ( 8 ), a third ring-shaped duct ( 9 ), arranged around said second ring-shaped ducts ( 8 ), a head ( 2 ), fixed to one end of said body and provided with at least one first central hole ( 7 ), coaxial to the first longitudinal axis ( 6 ) and connecting said first central duct ( 8 ) with the outside of the cylindrical body ( 3 ), the head ( 2 ) being provided with second and third through holes ( 5 ) connecting respectively said second and third ring-shaped ducts ( 9 , 10 , 11 ) with the outside of the injector-burner, the second through holes ( 5 ) defining respective second axes, wherein each second respective axis forms a first angle with a plane passing through the first axis ( 6 ) and an intersection point of said second respective axis with an external surface of the head ( 2 ) and wherein each second respective axis defines a projection on said plane forming a second angle with said first axis ( 6 ), characterised in that the second and third through holes are divided into several groups, the groups being reciprocally separated by circular sectors of the external surface of the head without holes, whereby the circular sectors have their apexes on the first axis ( 6 ) and their angles are greater than the angular distance between two adjacent second through holes.