Combustion – Burner having electrical heater or igniter – Spark electrode in front of or adjacent fuel discharger
Reexamination Certificate
2000-05-31
2001-07-03
Clarke, Sara (Department: 3743)
Combustion
Burner having electrical heater or igniter
Spark electrode in front of or adjacent fuel discharger
C126S0390BA
Reexamination Certificate
active
06254381
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention pertains to the art of cooking appliances and, more particularly, to a spark igniting gas burner assembly which provides for an air/gas mixture flow through an insulating support member for an ignition electrode.
2. Discussion of the Prior Art
The use of spark ignition for burners has become extremely common in gas cooking appliances. In general, spark ignition is utilized to avoid the unnecessary energy consumption required by a standing igniter pilot flame that has also been used to ignite gas range top burners. In general, it is known in the art to provide an electrically conductive gas burner including a side wall portion provided with a plurality of circumferentially spaced gas burner ports, as well as an igniter electrode having an end which terminates adjacent one of the burner ports. The electrode generally takes the form of a wire extending through the burner head, while being electrically insulated therefrom through the use of at least one insulating support member. Typically, the insulating support is sealed to the burner head such that the air/gas mixture is directed solely through the burner ports. Sending an electric current through the electrode creates a spark between the terminal end of the electrode and the burner head in order to ignite the air/gas mixture at the burner ports about the burner head.
In another known configuration, U.S. Pat. No. 4,810,188 discloses a spark ignited gas burner assembly incorporating an insulating, electrode support member formed with an elongated groove in an outer peripheral surface thereof. With this arrangement, a gas passageway is defined between the support member and a side wall of the burner, radially offset from a terminal end of the electrode. Even though varying designs have been proposed for delivering a required flow of the air/gas mixture to the terminal end of the electrode for proper ignition as discussed above, there still exists a need for an improved flow system which is not only efficient, but extremely effective, so as to assure consistent and prompt ignition.
It is also known in the art of gas cooking appliances to seal the burner assembly around an opening formed in a range top so that any spillage of food during cooking cannot pass between the burner assembly and range top. Since the terminal end of the electrode in the sealed burner assembly projects a fair distance from the side wall of the burner head, the electrode is subjected to potential damage during cleaning. Therefore, it would be desirable to recess or shorten the terminal end of an electrode to protect the electrode. However, with such an electrode mounting reconfiguration, the ignition characteristics of the overall bunner assembly is altered since the spacial relationship between the electrode and the air/gas mixture flow supplied for ignition is modified.
Based on the above, there exists a need in the art for an ignition gas flow configuration for use in connection with a gas burner assembly wherein the flow of gas directly to a terminal end of an electrode is assured, thereby guaranteeing the performance of effective and reliable ignition operations. In addition, there exists a need in the art for an improved gas burner assembly incorporating an electrode having a terminal end which is further recessed relative to a side wall of a burner head in order to protect the electrode during handling, cleaning and the like.
SUMMARY OF THE INVENTION
The present invention is directed to the mounting and configuration of an electrode assembly used in spark igniting a sealed gas buner assembly. More specifically, the gas bupper includes a head having an annular side wall provided with a plurality of burner ports and an enlarged aperture. An electrode or igniter element extends within the burner head and includes an end portion which extends through a central bore formed in an insulating support member supported by the burner head, with a terminal end of the electrode being exposed to the side wall of the burner head in a generally recessed fashion as compared to conventional sealed gas burner assemblies.
In order to assure reliable ignition, the insulating support member also defines at least one passage for directing an air/gas mixture flow through the insulating support member to the terminal end of the electrode. More specifically, the insulating support member includes an outer peripheral surface and the passage is formed within the support member at a position diametrically spaced from the outer peripheral surface. In accordance with the most preferred embodiments of the invention, multiple, annularly spaced passages are provided about the electrode. Most preferably, each of the passages opens into the bore such that an outer section of the electrode actually defines a portion of each passage.
With this arrangement, the air/gas mixture flows directly to the terminal end of the electrode when the burner is activated such that consistent and reliable ignitions are assured. In addition, by generally recessing the terminal end of the electrode, the electrode is further protected from potential damage during handling and cleaning. In any event, additional objects, features and advantages of the invention will become more readily apparent from the following detailed description of a preferred embodiment wherein like reference numerals refer to corresponding parts in the several views.
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Baynham James
Roden Jimmy C.
Clarke Sara
Diederiks & Whitelaw PLC
Maytag Corporation
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