US 12,435,872 B2
High efficiency low NOx burner
David Scott Neff, Parsons, KS (US); Michael Ryan Martinie, McCune, KS (US); Michael Joseph Purdon, Independence, KS (US); Lee Edward Head, Parsons, KS (US); James Edward Clemens, McCune, KS (US); Ryan Matthew Pemberton, Parsons, KS (US); and Cody J. Maloney, Independence, KS (US)
Assigned to Power Flame Incorporated, Parsons, KS (US)
Filed by Power Flame Incorporated, Parsons, KS (US)
Filed on Jan. 17, 2025, as Appl. No. 19/028,963.
Claims priority of provisional application 63/622,292, filed on Jan. 18, 2024.
Prior Publication US 2025/0237380 A1, Jul. 24, 2025
Int. Cl. F23D 11/10 (2006.01); F23D 11/40 (2006.01)
CPC F23D 11/101 (2013.01) [F23D 11/408 (2013.01); F23D 2900/00003 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A blast tube comprising:
an external wall creating a hollow interior;
an inlet end;
a blast end;
a diffuser disposed within the hollow interior proximate the blast end and having a primary passage configured to allow fluids to pass through the diffuser;
an auxiliary passage disposed radially between the diffuser and the external wall; and
a shutter that is disposed within the hollow interior and is configured to be selectively moved between a plurality of selectable positions, including a first position and a second position,
wherein, when the shutter is in the first position, the primary passage and auxiliary passage are both open such that a fluid is permitted to flow through both the primary passage and auxiliary passage, and
wherein, when the shutter is in the second position, the primary passage is open but the auxiliary passage is closed such that the fluid is permitted to flow exclusively through the primary passage.