F - Mech Eng,Light,Heat,Weapons – 23 – N
Patent
F - Mech Eng,Light,Heat,Weapons
23
N
F23N 1/00 (2006.01) F23D 14/12 (2006.01) F23D 14/46 (2006.01) F23N 5/24 (2006.01) F23Q 3/00 (2006.01)
Patent
CA 2298717
A unique system for implementing gas burners, particularly for gas range tops used in cooking. The design permits a number of improvements which are not feasible with conventional burners. Improved aeration over a wider range of firing rates is achieved with a novel orifice design. The primary orifice from which the gas exits into ambient air may contain a coaxially-located tapered pin. By adjusting the relative positions of the pin and orifice along their mutual axis, the effective cross-sectional area of the orifice changes, with a proportional change in gas flow. The relatively constant exit velocity of the gas throughout the operating range assures proper aeration at all flow rates, and permits a higher turn- down ratio than is feasible with conventional burners. To extend the turndown range even further, a secondary, non-adjustable orifice may be provided that is sized for proper aeration at very low flow rates. When the primary orifice is closed by the pin, the secondary orifice continues to operate, providing proper aeration for a very low flame. A separate but mechanically linked variable opening may be used to completely shutoff the gas supply when no flame is desired. This valve design also permits the valve to be co-located with the burner, which in turn enables the use of a combination valve-burner cartridge for ease of assembly and replacement. A flexible valve control coupling permits the valve and control knob to be remotely located from each other, and permits the relative positions of valve and control knob to be varied without changing parts. The use of a conventional flexible cable/housing for this control linkage eliminates the need for a separate wiring cable for a spark ignition system, since the metal control cable may also serve as the ignition wire. The smaller burner head permitted by improved aeration creates batter heat transfer characteristics over conventional burner heads. A dome-shaped burner cap may use directional radiant heat to provide more even heat transfer at low flame levels. An automatic valve shutoff may close the gas valve in the event of a runaway fire at the burner by melting a critical component in the control linkage.
Adams Joseph T.
Cimba David F.
Dursa Matthew J.
Ginther Brian B.
Grassi Michael J.
Adams Joseph T.
Borden Ladner Gervais Llp
Cimba David F.
Dursa Matthew J.
Ginther Brian B.
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