Heat injector gas burner

Claim 1

A gaseous fuel burner comprising the combination of an elongate tubular casing having an end wall at one end, an ignitor supported within said casing at a point intermediate its ends, an open-ended tubular flame holder disposed within the casing between the ignitor and the end wall, means for injecting gaseous fuel into the flame holder, duct means for directing a stream of air into said casing adjacent said end wall and substantially perpendicular to the axis of the casing, and regulating means spaced from said flame holder and disposed within the casing between said end wall and adjacent end of the flame holder for redirecting said air flow through both the casing and the flame holder and for regulating the quantity of air flowing respectively through and externally of the flame holder, said casing having an opening in a side thereof adjacent said end wall communicating with said duct means, and said regulating means being positioned opposite said opening, said regulating means being of a selected size and shape relative to the flame holder and having cup-shaped surface means dimensioned to receive therewithin from the duct means substantially all of the air entering the casing from the duct means and to redirect a major portion of the air from the duct means through the flame holder as primary combustion air and a minor amount through the casing along the outside of the flame holder as secondary combustion air.