Boiler with a combustion head cooling system

Abstract

An embodiment of a boiler comprises a fan, an air-gas premixing burner, a combustion chamber faced by a combustion head of the burner and a heat exchanger comprising a plurality of tubes in which the water of a heating system runs. The heat exchanger comprises cooling tubes arranged in contact either directly or with the interposition of an element formed by high heat conducting material, with a diffuser of the burner.

1 . A boiler, comprising a burner, a combustion chamber faced by a combustion head of said burner and a heat exchanger comprising a plurality of tubes in which the water of a heating system runs; said boiler being characterized in that said heat exchanger comprises a plurality of cooling tubes arranged in contact either directly, or with the interposition of an element formed by heat-conducting material, with an element of said combustion head of the burner. 
   
   
       2 . A boiler according to  claim 1 , wherein said element of the combustion head with which the cooling tubes are in contact is a diffuser. 
   
   
       3 . A boiler according to  claim 2 , wherein said diffuser presents a plurality of seats adapted to accommodate corresponding cooling tubes. 
   
   
       4 . A boiler according to  claim 3 , wherein the diffuser element comprises a perforated plate, in which there are obtained a plurality of longitudinal grooves, having a substantially semicircular profile; said grooves being the seats adapted to accommodate said plurality of cooling tubes. 
   
   
       5 . A boiler according to  claim 4 , further comprising a distributor element comprising a perforated plate the holes of which have a total passage section smaller than that of the holes of the diffuser; said plate also presenting longitudinal grooves and being coupled to the said diffuser at said grooves. 
   
   
       6 . A boiler according to  claim 1 , wherein the burner, the combustion chamber and the heat exchanger are accommodated inside a containing structure; said burner being reversibly coupled to said containing structure so as to be easily extracted. 
   
   
       7 . A boiler according to  claim 1 , wherein said heat exchanger comprises in addition to said plurality of cooling tubes, a second plurality of tubes having equal or reciprocally different dimensions and adapted to exploit the heat coming directly from the flame and from the fumes and the latent condensation heat of the fumes. 
   
   
       8 . A boiler according to  claim 7 , wherein said plurality of tubes is coupled to a plurality of fins. 
   
   
       9 . A boiler according to  claim 7 , further comprising a third plurality of tubes arranged downstream of said second plurality of cooling tubes; said third plurality of tubes being designed to further exploit the latent condensation heat of the combustion fumes. 
   
   
       10 . A boiler according to  claim 1 , wherein said burner is a total air-gas premixing burner.