F - Mech Eng,Light,Heat,Weapons – 23 – L
Patent
F - Mech Eng,Light,Heat,Weapons
23
L
126/23
F23L 17/00 (2006.01) F24H 9/00 (2006.01)
Patent
CA 2003793
ABSTRACT To inhibit internal heat exchanger corrosion, the pro- ducts of combustion from a standing pilot flame in an induced draft, fuel-fired furnace are prevented from migrating through the heat exchanger during idle periods of the furnace by flowing the products of combustion upwardly through a small vent tube into the outlet section of the draft inducer fan, and then into an external exhaust stack, thereby bypassing the heat exchanger. During operation of the draft inducer fan a negative pressure is maintained within the vent tube, to prevent combustion gas outflow therethough which might otherwise snuff out the pilot flame, by a venturi structure positioned within the draft inducer fan outlet section adjacent its juncture with the vent tube.
Harrigill William T.
Shellenberger Timothy J.
Blake Cassels & Graydon Llp
Rheem Manufacturing Company
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