Laminar flow jets

Abstract

A burner head is constructed with adjacent gas delivery tubes of different geometric cross-section shapes which are mechanically held in place radially. The tubes touch in a longitudinal direction at points along their respective inner and outer circumferences so that precise axial alignment whether coaxial or axially offset, is achieved while preserving the necessary laminar gas flow. This configuration greatly speeds the production time which allows economical burners to be produced even when a greater number of faceplate jets is desired. The tube-to-tube contact is also beneficial to the operation of the burner by providing a heat transfer path away from the innermost tube, which prevents overheating. Examples of the simplest geometric tube shapes employed are, for example, a square within a circle, or conversely, a circle within a square.

1 . A gas burner for producing a flame comprising:
 a head portion including a faceplate being the terminus of a plurality of elongate axially aligned gas delivery conduits, at least two of said conduits delivering at least two different types of fuel to said faceplate; and   a first conduit having a first cross-sectional shape and a second conduit having a second cross-sectional shape wherein longitudinal points along faceplate inside wall defining at least a portion of the first conduit are in direct contact with longitudinal points along an outside wall of the second conduit for maintaining the axial alignment of said conduits along their length and wherein the cross-sectional shape of said first conduit is a teardrop.   
     
     
         2 . The burner of  claim 1  wherein the cross-sectional shape of said second conduit is a circle. 
     
     
         3 . The burner of  claim 1  further including a third conduit which lies within said second conduit and has a circular cross-section. 
     
     
         4 . The burner of  claim 1  wherein both of said types of fuels are gases. 
     
     
         5 . The burner of  claim 3  wherein said third conduit has a polygonal cross-sectional shape. 
     
     
         6 . A gas burner for producing a flame comprising:
 a head portion including a faceplate being the terminus of a plurality of elongate axially aligned gas delivery conduits, at least two of said conduits delivering at least two different types of fuel flush with a top surface of the faceplate; and   a first conduit in said faceplate having a first cross-sectional shape and a second conduit having a second cross-sectional shape wherein longitudinal points along an inside wall of the first conduit are in direct contact with longitudinal points along an outside wall of the second conduit for maintaining the axial alignment of said conduits along their length.   
     
     
         7 . The gas burner of  claim 6  wherein said third conduit has a circular cross-sectional shape. 
     
     
         8 . The gas burner of  claim 6  wherein the cross-sectional shape of the first conduit is a teardrop. 
     
     
         9 . The gas burner of  claim 6  further including a third conduit coaxially aligned with and located within said second conduit which in turn lies within said first conduit.