Furnace heating assembly and method of making the same

A heating assembly for a furnace comprising:

• (a) a burner tube from which heat is transferred for heating the furnace;
• and
• (b) a burner disposed within the burner tube for directing a gaseous fuel and air mixture along and about a line disposed in the direction of extent of the burner tube to maintain a flame within the burner tube;
• (c) said burner comprising:
• a tubular body connectable to a source of fuel and air mixture;
• and defining:
• (i) a primary mixture flow passage defined at least in part by a flow restricting throat section;
• (ii) a discharge section downstream from said throat section, said discharge section having a larger flow area than said throat section, extending around and along said line and terminating in a discharge opening;
• (iii) a plurality of secondary mixture flow passages spaced radially from said line for bypassing secondary flows of mixture around said primary passage and discharging said secondary flows at relatively high velocities into said discharge section, said secondary flow passages oriented for directing the secondary mixture flows into said discharge section along secondary flow paths which are skewed at relatively small skew angles with respect to said line, said secondary mixture flows interacting with the primary mixture flow in said discharge section to impart a helical swirling motion to the mixture issuing from said discharge opening.

A high temperature burner connectable to a source of fluent fuel and air mixture comprising:

• (a) a first tubular body member communicating with the source and defining a reduced flow throat section forming a primary mixture flow passage opening through a first body member wall at its downstream end, and a plurality of secondary mixture passages opening in said wall radially outwardly from said primary flow passage opening, said throat section formed about a central axis extending in the direction of flow and said secondary flow passages disposed about said axis, said secondary passages diverging obliquely from said axis in the direction of flow and extending at relatively small skew angles with respect to said axis;
• and,
• (b) a second tubular burner body member projecting beyond said first body member wall to define a discharge section into which the mixture is directed by said flow passages, and a discharge opening;
• (c) said first and second members heat shrunk together and maintained assembled by resiliently engaged conforming surfaces on the respective members which are spaced outwardly from said first body member wall, said members remaining assembled together so long as said members remain at similar temperatures.