Refractoriless liquid fuel burner

Claim 1

A liquid fuel burner head comprising: A. a generally annular burner head housing spacedly enveloping a generally cylindrical primary air assembly, the head and assembly each having corresponding forward and rearward ends, (a) the primary air assembly having a plurality of internal primary air supply passage means extending in a generally forwardly direction in the assembly and emerging through annularly disposed primary air port means at the forward end of the primary air assembly, (b) means effective to produce a swirl of primary air in one direction about the axis of the primary air assembly as said air emerges from the primary air port means, (c) means associated with the primary air port means for adjusting the location of flame origin forward of and relative to the primary air port means, (d) the primary air assembly including a liquid fuel supply passage and a nozzle, the nozzle being centrally disposed at the forward end of the primary air assembly and encompassed by the primary air port means, the liquid fuel nozzle being effective to discharge a substantially fan-like spray of liquid fuel just forward of and across the primary air port means, (e) the primary air assembly and the nozzle together being axially moveable relative to the housing between forwardmost and rearwardmost positions respectively responsive to change in burner firing rate between a minimum and a maximum; B. secondary air supply passage means disposed in the space between the housing and the primary air assembly, (a) the secondary air supply passage means emerging through secondary air port means encompassing the forward end of the primary air assembly; (b) secondary air directional means rearwardly of the secondary air port means effective to produce a swirl of secondary air either in said direction or in the opposite direction about said axis as said air emerges from the secondary air port means; and C. means rearwardly of the secondary air directional means and port means effective to meter the amount of secondary air supplied to the secondary air port means from a lesser quantity when the primary air assembly and nozzle are in their forwardmost position to a greater quantity when the primary air assembly and nozzle are in their rearwardmost position.