Nozzle for spraying liquid fuel

Abstract

A nozzle for atomization of liquid fuel by air flowing through the nozzle ( 20 ), with an air entry area ( 50 ), an air exit area ( 52 ) and a flow path ( 54 ) which connects the air entry area ( 50 ) to the air exit area ( 52 ), the nozzle ( 20 ) being made of ceramic material, an air guidance device ( 56 ) being provided in the air entry area ( 50 ) which imparts a swirl to the inflowing air, and the air guidance device ( 56 ) being an integral part of the nozzle ( 20 ). Furthermore, there is a heater ( 10 ) equipped with such a nozzle ( 20 ) for mobile applications.

1 . Nozzle for atomization of liquid fuel by means of air flowing through a nozzle ( 20 ) with 
 an air entry area ( 50 ),    an air exit area ( 52 ) and    a flow path ( 54 ) which connects the air entry area ( 50 ) to the air exit area ( 52 ), characterized in that    the nozzle ( 20 ) formed of ceramic material,    that, in the air entry area ( 50 ), there are air guidance elements ( 56 ) which are adapted to impart a swirl to the inflowing air, and    that the air guidance elements ( 56 ) are formed as an integral part of the nozzle ( 20 ).    
   
   
       2 . Nozzle as claimed in  claim 1 , wherein the nozzle ( 20 ) has means ( 58 ) for holding a glow plug ( 62 ).  
   
   
       3 . Nozzle as claimed in  claim 1 , wherein 
 the nozzle ( 20 ) has, at least in part, an essentially cylindrical shape and    wherein the air guidance elements ( 56 ) form channels ( 60 ) which are offset with respect to radial directions.    
   
   
       4 . Nozzle as claimed in  claim 1 , wherein the air guidance elements ( 56 ) have essentially triangular base surfaces and rounded corners.  
   
   
       5 . Nozzle as claimed in  1 , wherein the air guidance elements ( 56 ) are blades.  
   
   
       6 . Nozzle as claimed in  claim 2 , wherein the means for holding the glow plug ( 62 ) is a hole ( 58 ) which runs obliquely to a center axis of the nozzle.  
   
   
       7 . Nozzle as claimed in  claim 2 , wherein 
 an at least essentially cylindrical part of the nozzle ( 20 ) has an essentially cylindrical shoulder ( 64 ) with an increased diameter and    wherein the means for holding the glow plug ( 62 ) is a hole ( 58 ) which penetrates the shoulder ( 64 ) and which runs obliquely to a center axis of the cylindrical part.    
   
   
       8 . Nozzle as claimed in  1 , wherein 
 an at least essentially cylindrical part of the nozzle ( 20 ) has an essentially cylindrical shoulder ( 64 ) with an increased diameter and    wherein the cylindrical shoulder ( 64 ) has recesses ( 66 ) for holding mounting pins ( 68 ).    
   
   
       9 . Nozzle as claimed in  claim 1 , wherein the nozzle ( 20 ) is a Venturi nozzle.  
   
   
       10 . Heater ( 10 ) for mobile applications, especially motor vehicles, with a burner ( 12 ) for combustion of a fuel/air mixture, the burner ( 12 ) having a nozzle comprising: 
 an air entry area,    an air exit area and    a flow path which connects the air entry area to the air exit area, wherein    the nozzle is formed of ceramic material,    in the air entry area, there are air guidance elements which are adapted to impart a swirl to the inflowing air, and    the air guidance elements are formed as an integral part of the nozzle.    
   
   
       11 . Heater as claimed in  claim 10 , wherein the nozzle has means for holding a glow plug.  
   
   
       12 . Heater as claimed in  claim 10 , wherein 
 the nozzle has, at least in part, an essentially cylindrical shape and    wherein the air guidance elements form channels which are offset with respect to radial directions.    
   
   
       13 . Heater as claimed in  claim 10 , wherein the air guidance elements have essentially triangular base surfaces and rounded comers.  
   
   
       14 . Heater as claimed in  claim 10 , wherein the air guidance elements are blades.  
   
   
       15 . Heater as claimed in  claim 11 , wherein the means for holding the glow plug is a hole which runs obliquely to a center axis of the nozzle.  
   
   
       16 . Heater as claimed in  claim 11 , wherein 
 an at least essentially cylindrical part of the nozzle has an essentially cylindrical shoulder with an increased diameter and    wherein the means for holding the glow plug is a hole which penetrates the shoulder and which runs obliquely to a center axis of the cylindrical part.    
   
   
       17 . Heater as claimed in  claim 10 , wherein 
 an at least essentially cylindrical part of the nozzle has an essentially cylindrical shoulder with an increased diameter and    wherein the cylindrical shoulder has recesses holding mounting pins.    
   
   
       18 . Heater as claimed in  claim 10 , wherein the nozzle is a Venturi nozzle.