Burner port shield
View Patent ↗A shield for placement around burner ports in a hot air furnace for reducing turbulence in the flow of secondary combustion air entering a heat exchanger. The shield also provides for intercepting moisture that condenses along the walls of the vertically oriented heat exchanger. The heat exchanger is part of a furnace. The drip shield includes a plate having a longitudinal axis and a plurality of through-openings placed in the plate along and/or parallel to its longitudinal axis. The through-openings are spaced apart so as to be positioned between and aligned with burner ports and respective heat exchanger tube inlets of the heat exchanger. The plate is preferably profiled to have a peak to encourage condensate run-off with the plurality of through-openings being placed along or generally parallel to the peak of the plate.
1. A drip shield for intercepting condensates that form along interior walls of a vertically-oriented heat exchanger, comprising:
a plate having a longitudinal axis and having a peaked profile extending along the plate; a plurality of through-openings placed in the plate, the through-openings being spaced apart so as to be positioned in alignment with burner ports and within inlets of the heat exchanger, each of the plurality of through-openings having a collar extending upward from the plate, each collar having an outer diameter that is smaller than the inner diameter of its corresponding heat exchanger inlet so as to extend into said inlet for accommodating said condensates formed along the interior thereof; and
said plate extending from each of said through-openings to at least one channel running alongside of the plate for receiving said condensates that runs off of the peaked profile of the plate.
2. The drip shield of claim 1 , wherein the drip shield further comprises:
opposing ends; and
a shoulder positioned along each of the opposing ends for further diverting condensate toward the channel.
3. A drip shield of claim 1 wherein said collar is:
defined by an upwardly curved annular ring which is spaced from and extends into said inlet of said heat exchanger;
said curved annular ring causing less turbulent laminar flow of secondary combustion air entering said heat exchanger inlet.
4. A shield of claim 3 wherein said heat exchanger is a clam-shell heat exchanger.
5. A shield of claim 3 wherein said heat exchanger is a tubular heat exchanger.