Cylindrical gas premix burner

Abstract

A cylindrical gas premix burner comprises a cylindrical burner deck onto which the flames are stabilized when the burner is in use; a mixing chamber inside the cylindrical burner deck; an inlet device mounted perpendicularly to the axial direction of the cylindrical burner deck for the supply of premix gas into the mixing chamber; and an end cap closing off the mixing chamber at the side opposite to the side where the inlet device is provided. The inlet device comprises a perforated metal plate. The perforations in the perforated metal plate are provided for the supply of premix gas into the mixing chamber. The perforated metal plate is dome shaped; such that perforations in the perforated metal plate are located at different height levels from the base of the cylindrical burner deck.

1 - 15 . (canceled) 
     
     
         16 . Cylindrical gas premix burner, comprising
 a cylindrical burner deck onto which the flames are stabilized when the burner is in use;   a mixing chamber inside the cylindrical burner deck;   an inlet device mounted perpendicularly to the axial direction of the cylindrical burner deck, for the supply of premix gas into the mixing chamber; and   an end cap closing off the mixing chamber at the side opposite to the side where the inlet device is provided;   wherein the inlet device comprises a perforated metal plate; wherein the perforations in the perforated metal plate are provided for the supply of premix gas into the mixing chamber;   wherein the perforated metal plate is dome shaped;   such that perforations in the perforated metal plate are located at different height levels from the base of the cylindrical burner deck.   
     
     
         17 . Cylindrical gas premix burner as in  claim 16 , wherein the dome shape of the perforated metal plate is provided by deep drawing of a perforated metal plate. 
     
     
         18 . Cylindrical gas premix burner as in  claim 16 , wherein the inlet device comprises a flange for mounting the inlet device into the burner. 
     
     
         19 . Cylindrical gas premix burner as in  claim 16 , wherein the part of the perforated metal plate at the central axis of the cylindrical burner deck is double curved. 
     
     
         20 . Cylindrical gas premix burner as in  claim 16 , wherein the perforated metal plate comprises a flat central section provided with perforations. 
     
     
         21 . Cylindrical gas premix burner as in  claim 16 , wherein the perforated metal plate comprises a spherical segment. 
     
     
         22 . Gas premix burner as in  claim 16 ,
 wherein the inlet device comprises a surface for mounting the burner into a heating appliance;   wherein the dome shape of the perforated metal plate extends into the inside of the mixing chamber;   wherein the largest distance P from the surface of the dome shape of the perforated metal plate to the plane of the surface of the inlet device for mounting the burner into a heating appliance is at least 0.25 times the internal diameter D of the cylindrical burner deck.   
     
     
         23 . Gas premix burner as in  claim 16 ,
 wherein the cylindrical burner deck comprises at its end where the inlet device is provided a blind zone onto which no combustion occurs when the burner is in use;   wherein the blind zone has a length L 1  measured from the end of the cylindrical burner deck where the inlet device is provided;   wherein the inlet device comprises a surface for mounting the burner into a heating appliance;   wherein the dome shape of the perforated metal plate extends into the inside of the mixing chamber;   wherein the largest distance P from the surface of the dome shape of the perforated metal plate to the plane of the surface of the inlet device for mounting the burner into a heating appliance is at least 0.75 times, even more preferably at least 0.9 times the length L 1  of the blind zone.   
     
     
         24 . Cylindrical gas premix burner as in  claim 16 , wherein the cylindrical burner deck has an L/D ratio of more than 3; wherein L is the axial length of the burner deck and D is the internal diameter of the cylindrical burner deck. 
     
     
         25 . Cylindrical gas premix burner as in  claim 16 , wherein the cylindrical burner deck comprises a perforated metal sheet or a steel wire mesh. 
     
     
         26 . Cylindrical gas premix burner as in  claim 25 ,
 wherein the cylindrical burner deck comprises a perforated metal sheet or a steel wire mesh onto which the flames are stabilized when the burner is in use.   
     
     
         27 . Cylindrical gas premix burner as in  claim 16 , wherein the cylindrical burner deck comprises a fiber based burner deck onto which flames are stabilized when the burner is in use. 
     
     
         28 . Cylindrical gas premix burner as in  claim 16 , wherein the burner is provided so that in use of the burner, the premix gas flows from the inlet device through the cylindrical burner deck without further passing a gas diffusing device. 
     
     
         29 . Cylindrical gas premix burner as in  claim 16 , wherein the mixing chamber comprises a diffuser, wherein the diffuser is an open pore cylindrical object. 
     
     
         30 . Cylindrical gas premix burner as in  claim 16 , wherein an ignition pen and/or a flame sensing pen is provided; and wherein the ignition pen and/or the flame sensing pen are provided at the side of the burner where the inlet device is provided.