Burner for a heater device with improved fuel supply

Abstract

A burner for a heater, especially for use in motor vehicles, with a burner nozzle ( 12 ) for supplying and atomizing of fuel, which has a fuel needle ( 14 ) for supplying fuel to the burner ( 10 ) and a combustion air supply ( 16 ) for supplying combustion air to the burner, and a starting zone ( 18 ) in which ignition of the fuel to start the burner takes place. It is provided that, by choosing the inside diameter of the fuel needle ( 14 ) the exit speed of the fuel is predetermined such that, during the starting phase of the burner ( 10 ), fuel in essentially unatomized form reaches the starting zone ( 18 ).

1 - 14 . (canceled) 
   
   
       15 . Burner for a heater for use in motor vehicles, comprising:
 a combustion chamber   a burner nozzle for supplying and atomizing of fuel having a fuel needle for supplying fuel to the combustion chamber and a combustion air supply for supplying combustion air to the combustion chamber, and   a starting zone in which ignition of the fuel to start the burner takes place,   wherein the inside diameter of the fuel needle produces a predetermined exit speed of the fuel such that, during a starting phase of the burner, fuel in essentially unatomized form reaches the starting zone.   
   
   
       16 . Burner as claimed in  claim 15 , wherein the inside diameter of the fuel needle is between 0.5 mm and 0.7 mm. 
   
   
       17 . Burner as claimed in  claim 15 , wherein the inside diameter of the fuel needle is about 0.6 mm. 
   
   
       18 . Burner as claimed in  claim 15 , wherein the starting zone is a starting chamber into which an ignition element projects. 
   
   
       19 . Burner as claimed in  claim 15 , further comprising a heat shield having a generally centrally located passage therethrough that is surrounded by a ring openings in the heat shield;
 wherein:
 the heat shield is located between the burner nozzle and the combustion chamber, 
 the combustion air supply comprises a primary air supply directed from the burner nozzle through the passage in the heat shield and a secondary air supply directed to the combustion chamber through said openings in the heat shield, and 
 said openings are provided with air guide elements. 
   
   
   
       20 . Burner as claimed in  claim 19 , wherein the air guide elements are formed by tabs which are integral with the heat shield and which project toward the combustion chamber. 
   
   
       21 . Burner as claimed in  claim 20 , wherein the tabs are made at different angles relative to at least one of the radius and surface of the heat shield. 
   
   
       22 . Burner as claimed in  claim 21 , wherein the tabs are formed of groups of tabs, the tabs of each group being of essentially the same angle relative to said at least one of the radius and surface of the heat shield. 
   
   
       23 . Burner as claimed in  claim 19 , wherein:
 the combustion chamber has a burnout zone and   secondary air is supplied to the burnout zone with a higher angular momentum than secondary air which is supplied to the starting zone.   
   
   
       24 . Burner as claimed in  claim 19 , wherein the heat shield has an opening for routing and ignition element through. 
   
   
       25 . Burner as claimed in  claim 15 , wherein:
 the combustion chamber is essentially axially symmetrical,   there is a baffle plate in the combustion chamber, and   wherein the baffle plate has a defined curvature in a downstream axial direction into the combustion chamber.   
   
   
       26 . Burner as claimed in  claim 23 , further comprising a baffle plate in the combustion chamber, the baffle plate having a defined curvature there in a direction toward the burnout zone. 
   
   
       27 . Burner as claimed in  claim 26 , wherein
 an outer periphery of the baffle plate defines a plane and   wherein a ratio between a maximum axial distance of a portion of the baffle plate from this 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 said plane and the diameter of the baffle plate is about 0.14. 
   
   
       29 . Burner as claimed in  claim 25 , wherein
 an outer periphery of the baffle plate defines a plane and   wherein a ratio between a maximum axial distance of a portion of the baffle plate from this plane and the diameter of the baffle plate is between 0.07 and 0.21.   
   
   
       30 . Burner as claimed in  claim 29 , wherein the ratio between the maximum axial distance of the baffle plate from said plane and the diameter of the baffle plate is about 0.14.