Burner for a heater with improved heat shield

Abstract

A burner ( 10 ) for a heater, especially for use in motor vehicles, with a burner nozzle ( 12 ) for supplying of fuel and primary air, a combustion chamber ( 22 ), and a heat shield ( 24 ) between the burner nozzle and the combustion chamber, the heat shield having openings ( 26 ) for supplying secondary air to the combustion chamber. The openings ( 26 ) are equipped with air guide elements ( 28, 30 ).

1 - 14 . (canceled) 
   
   
       15 . Burner for a heater for use in motor vehicles, comprising:
 a burner nozzle for supplying of fuel and primary air,   a combustion chamber and   a heat shield between the burner nozzle and the combustion chamber, the heat shield having openings for supplying secondary air to the combustion chamber,   wherein the openings are equipped with air guide elements.   
   
   
       16 . Burner as claimed in  claim 15 , wherein the air guide elements are formed by tabs which are made integrally with the heat shield and which project in a direction toward the combustion chamber. 
   
   
       17 . Burner as claimed in  claim 16 , wherein at least some of the tabs are arranged at a different angle than other of the tabs with respect to at least one of the surface of the heat shield and the radius of the heat shield. 
   
   
       18 . Burner as claimed in  claim 16 , wherein the tabs are arranged in groups, the tabs of each group being arranged at an essentially identical angle relative to at least one of the surface of the heat shield and the radius of the heat shield, the angle at which the tabs of one of the groups is arranged being different from that at which the tabs of another of the groups is arranged. 
   
   
       19 . Burner as claimed in  claim 15 , wherein
 the burner has a starting zone and burnout zone and   wherein the secondary air is supplied to the burnout zone with a lower angular momentum than secondary air which is supplied to the starting zone.   
   
   
       20 . Burner as claimed in  claim 15 , wherein the heat shield has an opening through which an ignition element is routed. 
   
   
       21 . Burner as claimed in  claim 15 , wherein
 the burner nozzle has a fuel needle for supplying fuel to the burner and a primary air supply for supplying combustion air to the burner and   wherein the inside diameter of the fuel needle is set to produce a predetermined exit speed of the fuel such that fuel in essentially unatomized form reaches the starting zone during a starting phase of the burner.   
   
   
       22 . Burner as claimed in  claim 21 , wherein the inside diameter of the fuel needle is between 0.5 mm and 0.7 mm. 
   
   
       23 . Burner as claimed in  claim 21 , wherein the inside diameter of the fuel needle is about 0.6 mm. 
   
   
       24 . Burner as claimed in  claim 19 , wherein the starting zone is a starting chamber into which an ignition element projects. 
   
   
       25 . Burner as claimed in  claim 15 , wherein
 the combustion chamber is essentially axially symmetrical,   wherein a baffle plate is located in the combustion chamber, and   wherein the baffle plate has a curvature in an axial direction.   
   
   
       26 . Burner as claimed in  claim 25 , wherein the curvature is in a direction toward a burnout zone. 
   
   
       27 . Burner as claimed in  claim 26 , wherein
 an outer periphery of the baffle plate defines a plane and   a ratio between a maximum axial distance of the baffle plate from said plane and the diameter of the baffle plate is between 0.07 and 0.21.   
   
   
       28 . Burner as claimed in  claim 27 , wherein the ratio between the maximum axial distance of the baffle plate from the plane and the diameter of the baffle plate is about 0.14.