Burner, specifically a premix burner

Abstract

A burner is provided and includes a cylindrical burner head housed in a combustion chamber of a heating apparatus, on which an air and gas mixture is burnt, the head including a cylindrical shell with through apertures, fixed at a first axial end by a connecting flange to a shutter element intended to seal the combustion chamber, while its opposite axial end has a solid end wall which seals the head, an element for distributing the air and gas mixture, positioned inside the burner head and intended to distribute the flow of combustible mixture reaching the burner on to the burner head. The distributor element includes a plate-like portion extending as a continuation of the connecting flange and extending substantially in an orthogonal direction to the axial direction of extension of the cylindrical head, the plate-like portion having through apertures for distributing the mixture to the burner head.

1 . A burner, comprising:
 a cylindrical burner head ( 3 ) designed to be housed in a combustion chamber ( 4 ) of a heating apparatus, on which an air and gas mixture supplied to the combustion chamber ( 4 ) is burnt,   said head ( 3 ) including a cylindrical shell ( 9 ) with through apertures, fixed at a first axial end by a connecting flange ( 8 ) to a shutter element ( 7 ) intended to seal the combustion chamber ( 4 ), while its opposite axial end has a solid end wall ( 3   a ) which seals said head ( 3 ),   an element ( 10 ) for distributing the air and gas mixture, positioned inside the burner head ( 3 ) and intended to distribute the flow of combustible mixture reaching the burner on to the burner head ( 3 ), wherein said distributor element comprises a platelike portion ( 11 ) extending as a continuation of said connecting flange ( 8 ) and extending substantially in an orthogonal direction to the axial direction of extension of the cylindrical head, said platelike portion ( 11 ) having through apertures ( 12 ) for distributing the mixture to the burner head ( 3 ).   
     
     
         2 . A burner according to  claim 1 , wherein said portion ( 11 ) of the distributor element extends into the connecting flange ( 8 ). 
     
     
         3 . A burner according to  claim 1 , wherein a total cross section of the through apertures ( 12 ) in said portion ( 11 ) of distributor forms not less than 70% of a predetermined cross section of distribution of the mixture towards the burner head ( 3 ). 
     
     
         4 . A burner according to  claim 1 , wherein said portion ( 11 ) of the distributor element ( 10 ) is coaxial with the burner head ( 3 ). 
     
     
         5 . A burner according to  claim 1 , wherein the positioning of said portion ( 11 ) of distributor with respect to the head ( 3 ) is chosen in such a way that the ratio between the axial distance (L 1 ) of the portion from a fastening base of the connecting flange ( 8 ) and the axial length (L) of the head measured from the fastening base of the flange is less than or equal to 0.5. 
     
     
         6 . A burner according to  claim 1 , wherein said portion ( 11 ) is made in one piece with said flange ( 8 ). 
     
     
         7 . A burner according to  claim 1 , wherein said portion ( 11 ) of distributor is disc-shaped. 
     
     
         8 . A burner according to  claim 7 , wherein said portion ( 11 ) of the distributor element is platelike with a flat profile. 
     
     
         9 . A burner according to  claim 1 , wherein said portion ( 11 ) of the distributor element is linked to the flange ( 8 ) by a sleeve formation ( 13 ) coaxial with it. 
     
     
         10 . A burner according to  claim 9 , wherein said sleeve formation ( 13 ) has a shell with a cylindrical profile having a predetermined axial extension towards the end wall of the burner head. 
     
     
         11 . A burner according to  claim 10 , wherein said sleeve formation ( 13 ) is integral with said flange ( 8 ) and with said portion ( 11 ) of the distributor element. 
     
     
         12 . A burner according to  claim 1 , wherein the distribution apertures ( 12 ) passing through said portion ( 11 ) of the distributor element are formed along a plurality of concentric rings and are distributed at regular intervals along each ring. 
     
     
         13 . A burner according to  claim 12 , wherein cross sections of the through apertures ( 12 ) of each ring are equal to each other. 
     
     
         14 . A burner according to  claim 13 , wherein the passage cross section of the apertures ( 12 ) of each ring increases from one ring to the next, towards the central axis of said portion. 
     
     
         15 . A burner according to  claim 1 , wherein said through apertures ( 12 ) are shaped in the form of circular holes. 
     
     
         16 . A burner according to  claim 12 , wherein a central through hole ( 14 ) coaxial with the principal axis of said portion ( 11 ) of distributor element ( 10 ) is provided, in addition to said plurality of concentric rings of through apertures. 
     
     
         17 . A burner according to  claim 12 , wherein the total cross sections of the apertures of each ring are equal to each other.