Gas micro burner
AssigneeR.J. Reynolds Tobacco Company
InventorsFrank Kelley St. Charles, Kayyani C. Adiga
Life of this patent
Estimating the term…
Abstract
A micro gas burner is provided that generates a stable, pre-mixed flame that produces little to no soot or unburned hydrocarbons. The gas burner includes a fuel inlet, nozzle, oxygenation chamber with at least one air inlet, a mixing chamber having a frustoconical inner wall, at least one permeable barrier and a flame holder. The gas burner thoroughly mixes fuel and entrained air to form a nearly stoichiometric mixture prior to combustion. The gas burner mixes the fuel and air so thoroughly that it requires a lower fuel flow rate than would otherwise be necessary to produce a stable, pre-mixed flame. The gas burner may include an optional flame tube with an optional exhaust port in which a flame is contained and sequestered from diffusing air.
Claims35
A gas burner, adapted to be integrally combined with a smoking article, comprising:
- a venturi having a nozzle and an oxygenation chamber in flow communication with said nozzle, said oxygenation chamber having at least one air inlet;
- a mixing chamber in flow communication with said oxygenation chamber and having a frustoconical portion of an inner wall that diverges from said oxygenation chamber;
- at least one permeable barrier in flow communication with said mixing chamber and being disposed opposite said oxygenation chamber;
- and
- a flame holder in flow communication with said permeable barrier, said flame holder including a flame tube in flow communication with said flame holder, said flame tube having an exhaust port and being adapted to hold said smoking article.
A gas burner for use with a smoking article comprising:
- a nozzle;
- an oxygenation chamber in flow communication with said nozzle;
- at least one air inlet in flow communication with said oxygenation chamber;
- a mixing chamber in flow communication with said oxygenation chamber, said
- mixing chamber having a frustoconical inner wall;
- and,
- a flame holder in flow communication with said mixing chamber, said flame holder having at least one opening therein;
- and a flame tube in flow communication with said flame holder, said flame tube being open at one end to receive said smoking article and having an exhaust port remote from said one end.
A gas burner, integrally combined with a smoking article, comprising:
- a venturi having a nozzle and an oxygenation chamber in flow communication with said nozzle, said oxygenation chamber having at least one air inlet;
- a mixing chamber in flow communication with said oxygenation chamber and having a frustoconical portion of an inner wall that diverges from said oxygenation chamber;
- at least one permeable barrier in flow communication with said mixing chamber and being disposed opposite said oxygenation chamber;
- a flame holder in flow communication with said permeable barrier:
- a flame tube in flow communication with said flame holder;
- and
- at least one exhaust port in said flame tube.
Dependencies are inferred from the claim text.