Water heater having a low NOx burner integrated with FVIR platform
First Claim
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1. A fuel-fired heating appliance comprising:
- a combustion chamber separated from a plenum area by a wall structure;
an inlet space for receiving combustion air from outside said appliance; and
a fuel burner having a hollow body with an outlet portion thereof projecting from said wall structure into said combustion chamber, and an inlet portion thereof projecting from said wall structure into said plenum area, said inlet portion having a venturi inlet structure associated therewith, communicated with said inlet space, and operative to flow combustion air from said inlet space into said inlet portion of said hollow body, said wall structure being defined by a peripheral portion of said fuel burner.
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Abstract
Various embodiments of fuel-fired low NOx water heaters are provided with burners having built-in venturi inlet sections for receiving fuel from a source thereof and combustion air from outside of the water heater. The burners are integrated in various manners with flammable vapor ignition resistance (FVIR) platforms to thereby reduce the tooling costs necessary to provide the water heaters with both lowered NOx emissions and flammable vapor ignition resistance.
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Citations
47 Claims
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1. A fuel-fired heating appliance comprising:
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a combustion chamber separated from a plenum area by a wall structure; an inlet space for receiving combustion air from outside said appliance; and a fuel burner having a hollow body with an outlet portion thereof projecting from said wall structure into said combustion chamber, and an inlet portion thereof projecting from said wall structure into said plenum area, said inlet portion having a venturi inlet structure associated therewith, communicated with said inlet space, and operative to flow combustion air from said inlet space into said inlet portion of said hollow body, said wall structure being defined by a peripheral portion of said fuel burner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A fuel-fired heating appliance comprising:
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a combustion chamber separated from a plenum area by a wall structure; an inlet space for receiving combustion air from outside said appliance; and a fuel burner having a hollow body with an outlet portion thereof projecting from said wall structure into said combustion chamber, and an inlet portion thereof projecting from said wall structure into said plenum area, said inlet portion having a venturi inlet structure associated therewith, communicated with said inlet space, and operative to flow combustion air from said inlet space into said inlet portion of said hollow body, said wall structure being separate from said fuel burner and having an opening through which said fuel burner extends between said combustion chamber and said plenum area.
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12. A fuel-fired heating appliance comprising:
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a combustion chamber separated from a plenum area by a wall structure; an inlet space for receiving combustion air from outside said appliance; and a fuel burner having a hollow body with an outlet portion thereof projecting from said wall structure into said combustion chamber, and an inlet portion thereof projecting from said wall structure into said plenum area, said inlet portion having a venturi inlet structure associated therewith, communicated with said inlet space, and operative to flow combustion air from said inlet space into said inlet portion of said hollow body, said venturi inlet structure including an inlet conduit structure extending outwardly from said inlet portion of said hollow fuel burner body, said inlet conduit structure having an outer inlet end opening disposed within said plenum area.
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13. A fuel-fired heating appliance comprising:
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a combustion chamber separated from a plenum area by a wall structure; an inlet space for receiving combustion air from outside said appliance; and a fuel burner having a hollow body with an outlet portion thereof projecting from said wall structure into said combustion chamber, and an inlet portion thereof projecting from said wall structure into said plenum area, said inlet portion having a venturi inlet structure associated therewith, communicated with said inlet space, and operative to flow combustion air from said inlet space into said inlet portion of said hollow body said wall structure being defined by a peripheral portion of said fuel burner; and a combustion shutoff system operative to terminate combustion in said fuel-fired heating appliance in response to the temperature in said combustion chamber reaching a predetermined unacceptably high temperature. - View Dependent Claims (14, 15)
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16. A fuel-fired heating appliance comprising:
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a combustion chamber separated from a plenum area by a wall structure; an inlet space for receiving combustion air from outside said appliance; and a fuel burner having a hollow body with an outlet portion thereof projecting from said wall structure into said combustion chamber, and an inlet portion thereof projecting from said wall structure into said plenum area, said inlet portion having a venturi inlet structure associated therewith, communicated with said inlet space, and operative to flow combustion air from said inlet space into said inlet portion of said hollow body; and a flammable vapor ignition resistance system operative to prevent flame outflow from said combustion chamber. - View Dependent Claims (17, 18)
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19. A fuel-fired water heater comprising:
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an inner wall structure defining a tank for holding water to be heated, a combustion chamber extending downwardly from a lower end of said tank and having a bottom wall structure, and a skirt wall depending from a bottom peripheral portion of said combustion chamber and circumscribing a plenum area separated from said combustion chamber by said bottom wall structure, said skirt wall having an opening therein; an outer wall structure outwardly circumscribing said inner wall structure and defining therewith an air inlet space at least partially circumscribing said skirt wall, said outer wall structure having a combustion air inlet opening area extending therethrough into said air inlet space; a fuel burner having a hollow body with an upper outlet portion thereof projecting from said bottom wall structure into said combustion chamber, and a lower inlet portion projecting from said bottom wall structure into said plenum area, said inlet portion having a venturi inlet structure associated therewith and having an inlet communicated with said air inlet space in a manner permitting combustion air entering said air inlet space through said combustion air inlet opening area from outside said water heater to be drawn into said inlet of said venturi inlet structure; and fuel delivery apparatus for delivering fuel from a source thereof to the interior of said lower inlet portion of said hollow body for mixture with combustion air flowed thereinto via said venturi inlet structure. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification