Burner and method for its production

Abstract

A burner having a combustion space and a multiplicity of swirl channels. each having a fuel nozzle for introducing fuel into the respective swirl channel. and The swirl channels extend from an inflow side to an outflow side leading into the fuel space. The swirl channels can each be flowed through by a fuel-air mixture consisting of the fuel and air flowing into the swirl channel. The burner has a centre axis running through the combustion space and the swirl channels, emanating from the outflow side, are helically wound about the centre axis in portions, so that the fuel-air mixture flowing from the inflow side along the flow path to the outflow side flows through the swirl channels in each case is subjected to a swirl and flows into the combustion space in a swirl-subjected manner.

1 .- 13 . (canceled) 
     
     
         14 . A burner comprising:
 a combustion space;   a multiplicity of swirl channels, wherein each swirl channel has at least one fuel nozzle that introduces fuel into each respective swirl channel;   wherein the multiplicity of swirl channels each extend from an inflow side, where the fuel from the respective fuel nozzle can be introduced into each respective swirl channel to an outflow side leading into the combustion space;   a flow path of each respective swirl channel extending from the inflow side to the outflow side that is flowed through by a fuel-air mixture of the fuel and air flowing into each swirl channel,   a centre axis running through the combustion space,   wherein the multiplicity of swirl channels, emanating from the outflow side, are helically wound about the centre axis at least in portions, so that the fuel-air mixture flowing from the inflow side along the flow path to the outflow side is subjected to a swirl by the multiplicity of swirl channels and flows into the combustion space in a swirl-subjected manner.   
     
     
         15 . The burner according to  claim 14 ,
 wherein in the portion of the multiplicity of swirl channels running helically about the centre axis, the flow paths and/or centre lines of the multiplicity of swirl channels each comprise a turn angle α of at least one of:
 greater than 0° and smaller than 90°; 
 greater than 60° and smaller than 90°; and 
 exactly 60° 
   
     
     
         16 . The burner according to  claim 14 ,
 wherein the multiplicity of swirl channels each comprise, on the outflow side, the portion wound helically about the centre axis and on the inflow side a portion running parallel to the centre axis,   wherein a respective transition between the helically wound portion and the portion running parallel to the centre axis is smooth.   
     
     
         17 . The burner according to  claim 14 ,
 wherein the multiplicity of swirl channels each have an annular cross-section and are formed as swirl tubes.   
     
     
         18 . The burner according to  claim 14 ,
 wherein each of the fuel nozzles on the inflow side extends into each respective swirl channel.   
     
     
         19 . The burner according to  claim 14 ,
 wherein the multiplicity of swirl channels on the inflow side each comprise a funnel-shaped inflow portion, into which the respective fuel nozzle extends,   wherein between an outer surface of the respective fuel nozzle and an inner surface of the respective swirl channel an air passage running in a cross-section annularly about the fuel nozzle is defined in its inflow portion, through which air can flow into the respective swirl channel.   
     
     
         20 . The burner according to  claim 14 ,
 wherein fluid guiding elements for flow optimisation are provided in the multiplicity of swirl channels and/or on the fuel nozzles.   
     
     
         21 . The burner according to  claim 14 ,
 wherein the multiplicity of swirl channels are arranged on at least one annular course that is coaxial to the centre axis.   
     
     
         22 . The burner according to  claim 14 ,
 wherein the multiplicity of swirl channels of the multiplicity of swirl channels lie against one another.   
     
     
         23 . The burner according to  claim 22 ,
 wherein the multiplicity of swirl channels each comprise a wall delimiting the respective swirl channel in a radial direction and the walls of swirl channels lying against one another are formed integrally and/or in one piece.   
     
     
         24 . The burner according to  claim 14 ,
 wherein the fuel nozzles inject the fuel on the inflow side substantially transversely into the respective swirl channel.   
     
     
         25 . The burner according to  claim 14 ,
 wherein the multiplicity of swirl channels are produced from metal by selective laser melting.   
     
     
         26 . A method for producing a burner having a combustion space; a multiplicity of swirl channels,
 wherein each swirl channel has at least one fuel nozzle that introduces fuel into each respective swirl channel; wherein the swirl channels each extend from an inflow side, where fuel from the respective fuel nozzle can be introduced into the swirl channel to an outflow side leading into the combustion space; a flow path of each swirl channel extending from the inflow side to the outflow side that is flowed through by a fuel-air mixture of the fuel and air flowing into the swirl channel; a centre axis running through the combustion space, wherein the swirl channels, emanating from the outflow side, are helically wound about the centre axis at least in portions, so that the fuel-air mixture flowing from the inflow side along the flow path to the outflow side is subjected to a swirl by the swirl channels and flows into the combustion space in a swirl-subjected manner, comprising one of:
 producing the swirl channels from a metal powder by selective laser melting; and 
 individually producing the swirl channels and arranging the swirl channels about the centre axis; 
 or 
 producing the swirl channels in groups joined integrally and/or in one piece; and 
 arranging the groups of the swirl channels joined to one another about the centre axis; 
 or 
 producing all swirl channels joined integrally and/or in one piece and arranged about the centre axis.