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US 4,793,800 AGranted
Gas water heater/boiler
AssigneeLochinvar Water Heater Corporation
InventorsWilliam L. Vallett, Mohsen Sarfehjoo
Life of this patent
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AssigneeLochinvar Water Heater Corporation
InventorsWilliam L. Vallett, Mohsen Sarfehjoo
Estimating the term…
There is disclosed a gas-fired water heater/boiler apparatus with a unique burner assembly that provides high levels of BTU/hour input making it suitable for commercial installations. The gas burner includes a pair of superimposed tubes, each having evenly distributed perforations of a different uniform size, that are rolled flush together and provide a thick walled burner with greatly increased strength and resistance to premature failure while furnishing an optimum flame pattern. The gas burner projects into the interior of a vertical, cylindrical array of finned heat exhanger tubes through which the fluid to be heated is circulated. The water heater/boiler apparatus is compact and thermally insulated by a pressurized forehearth and may be installed on combustible floors or in closets with zero clearance.
A gas-fired burner tube for a water heater/boiler apparatus comprising an inner tube having a plurality of first perforations and an outer tube superimposed over said inner tube, said outer tube having a plurality of second perforations which are substantially larger than said first perforations, with more than one of said first perforations at least partially underlying each second perforation, said superimposed inner and outer tubes arranged to increase the thickness of said burner tube and to cover a portion of said first perforations.
A metal, tubular gas-fired burner for a water heater/boiler apparatus comprising an inner perforated tube and an outer perforated tube superimposed on said inner perforated tube, said inner perforated tube including a plurality of first perforations of uniform size and distribution thereby giving said inner perforated tube an open area of a first amount, said outer perforated tube comprising a plurality of second perforations of uniform size and distribution that are substantially larger than said first perforations, with more than one of said first perforations at least partially underlying each second perforation, said outer perforated tube having an open area of a second amount which is substantially greater than said first amount, and said outer perforated tube is superimposed over said inner perforated tube such that a portion of said first perforations are covered and said burner portion has a net open area that is less than said first amount.
Dependencies are inferred from the claim text.