Modulating burner

Abstract

A burner includes a diffuser in which first openings and second openings are provided for the passage of a mixture of fuel and air delivered to the burner. A distributing element is arranged inside the burner near the diffuser and is provided with further first openings and further second openings for the passage of the mixture. An ionization sensor is arranged near a zone of the surface of the diffuser in a direction substantially parallel to the surface of the diffuser. The first openings are shaped as holes and the second openings are shaped as slits. Two rows of slits are provided in the zone. The rows are separated by a surface portion of the diffuser devoid of openings. The ionization sensor is arranged above the surface portion of the diffuser between the two rows of slits.

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       19 . A burner, comprising a diffuser in which first openings and second openings are made for the passage of a mixture of fuel and air delivered to the burner, a distributing element arranged inside the burner near said diffuser, said distributing element being provided with further first openings and further second openings for the passage of said mixture, an ionization sensor arranged near a zone of the surface of said diffuser in a direction substantially parallel to the surface of the diffuser, said first openings having the shape of holes and said second openings having the shape of slits, in said zone two rows of slits being made that are separated by a surface portion of diffuser devoid of openings, wherein said ionization sensor is arranged above said surface portion of diffuser between said two rows of slits. 
   
   
       20 . A burner, as defined in  claim 19 , wherein said further second openings are arranged at said zone of said diffuser, said further second openings having a distribution other than the distribution of said further first openings and/or dimensions greater than the dimensions of said further first openings. 
   
   
       21 . A burner, as defined in  claim 20 , wherein said further second openings have a distribution density that is greater than the distribution density of said further first openings. 
   
   
       22 . A burner, as defined in  claim 19 , wherein said diffuser and said distributing element have a substantially cylindrical shape. 
   
   
       23 . A burner, as defined in  claim 21 , wherein said diffuser and said distributing element have a substantially flat shape. 
   
   
       24 . A burner, as defined in  claim 23 , wherein said diffuser comprises a plurality of diffuser elements that are arranged alongside one another. 
   
   
       25 . A burner, as defined in  claim 24 , wherein said distributing element comprises a plurality of distributing elements each of which is associated with a respective diffuser element. 
   
   
       26 . A burner, as defined in  claim 24 , wherein said zone comprises one of said diffuser elements. 
   
   
       27 . A burner, as defined in  claim 25 , wherein each of said distributing elements is provided with said further first openings. 
   
   
       28 . A burner, as defined in  claim 27 , wherein one of said distributing elements associated with said diffuser element is provided with said further second openings. 
   
   
       29 . A burner, as defined in  claim 19 , wherein said first hole-shaped openings have a diameter of at least 0.7 mm approximately. 
   
   
       30 . A burner, as defined in  claim 19 , wherein said second slit-shaped openings have a length comprised between 4 mm and 8 mm and a width comprised between 0.4 mm and 0.8 mm. 
   
   
       31 . A burner, as defined in  claim 30 , wherein said second slit-shaped openings are 6 mm long and 0.6 mm wide. 
   
   
       32 . A burner, as defined in  claim 19 , wherein said further first openings and said further second openings have a diameter between approximately 2.5 mm and approximately 5 mm.