Stoves and furnaces – Stoves – Cooking
Reexamination Certificate
2000-09-13
2001-11-20
Lazarus, Ira S. (Department: 3743)
Stoves and furnaces
Stoves
Cooking
C126S0390BA, C431S284000, C137S625120, C137S905000
Reexamination Certificate
active
06318357
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a gas burner configuration for cooking areas. The configuration includes a multi-ring gas burner equipped with an inner burner having lateral gas/air mixture outlet openings and low combustion power. The configuration also includes an annular outer burner, disposed spaced from the inner burner, with gas/air mixture outlet openings, and a hand-operated gas fitting for directing, metering, and shutting off the combustion gas, which can be fed to the multi-ring burner through separate pipelines.
Such gas burner configurations are usually applied in heating, warming, and preparing meals, especially where there is a requirement for high heating power. Heating powers of up to 5 kW and above can be achieved with multi-ring burners so constructed. In particular, such burners are suitable as wok burners. Multi-ring gas burners are also used for achieving a greater control bandwidth by switching on and off individual burner rings having a variable heating power.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a gas burner configuration for cooking areas that overcomes the hereinafore-mentioned disadvantages of the heretofore-known devices of this general type and that has a high functional reliability, is easily operable, and has a simple structure, as well as having a heating power that is suitable, in particular, for use as a wok burner. Wok burners used, for example, in Chinese households most commonly have a nominal heating power, that is to say a maximum heating power of 4 to 6 kW.
With the foregoing and other objects in view there is provided, in accordance with the invention, a gas burner configuration for cooking areas, having a multi-ring gas burner including an inner burner with lateral gas/air mixture outlet openings and low combustion power, and an annular outer burner disposed at a spacing from the inner burner and having gas/air mixture outlet openings, a hand-operated gas fitting for directing, metering, and shutting off combustion gas to be fed to the multi-ring burner through separate pipelines, the hand-operated gas fitting having valves, an operating member with an actuating path adjustable to a plurality of setting positions and intermediate positions for the valves, and three gas duct branches to be opened and closed by the valves with the operating member, two of the three gas duct branches each opening for a permanently prescribed gas throughput, and a further one of the three gas duct branches constructed for a variable gas throughput to be influenced by the operating member and an associated one of the valves, one of the two gas duct branches having a permanently prescribed gas throughput associated with the inner burner and opened by an associated one of the valves over the entire actuating path starting from a zero position, possibly after a preliminary path of an operating member setting, and another two of the three gas duct branches associated with the outer burner and activated by the valves associated therewith through a segment of the actuating path keeping the first of the two gas duct branches open.
In accordance with another feature of the invention, the gas duct branches associated with the outer burner are activated through a final segment of the actuating path of the operating member, keeping one of the two gas duct branches open through its valves, and in an initial position of the final segment, the valve for the gas duct branch with the variable gas throughput is fully opened and has a final position in which the valve for the gas duct branch with variable gas throughput is closed.
The gas burner configuration according to the invention is, therefore, distinguished by a simple structure that can be operated in a user-friendly way in conjunction with a high maximum combustion power and a relatively low minimum combustion power. The inner burner, which is to be operated at constant power, can be constructed, for example, for a power of between 300 W and 500 W, and serves both as a burner for the lowest combustion power and, preferably, as an ignition burner.
In accordance with a further feature of the invention, an ignition element is disposed in the vicinity of the inner burner, and it is possible to actuate the ignition element by a piezoelectric current-voltage sensor or by an electronic current-voltage sensor, depending on the form of the gas burner configuration (according to the invention) used. The use of a piezoelectric current-voltage sensor is preferred more readily in portable gas burner units in which an external power supply is not ensured.
In accordance with an added feature of the invention, there is provided a thermocouple in the vicinity of the inner burner which serves, if appropriate, as a flame monitoring element and acts on a closure element in the gas fitting to interrupt the gas feed to the burner when the flame at the inner burner extinguishes.
The outer burner can be constructed, for example, for a maximum power of 5,000 W. It is possible for the maximum power of the outer burner to be controlled downward by approximately 1,000 W by gas feed throttling. Through gas duct branches in the gas fitting, both the gas feed for powering the inner burner and the gas feed for minimally powering the outer burner are metered as given values. The configuration ensures high combustion reliability in the overall structure of the burner even when having low power values. The maximum burner power is achieved by using an additional third duct branch in the fitting, which can be variably set up to the maximum value depending on the wishes of the operator.
In accordance with an additional feature of the invention, the required gas injector nozzle configuration, in the vicinity of which the combustion gas is mixed with the primary air, for the inner burner, is disposed directly in the burner head, while the corresponding gas injector nozzle configuration for the outer burner is disposed in the vicinity of the gas fitting. In the example of the inner burner having relatively low heating power, the mixing path between the lower part of the burner head, in which the gas injector nozzle configuration is provided, to the combustion site, suffices for good flame formation. In contrast, for a very high maximum power of the outer burner, in order to arrive at a good and uniformly-distributed mixing ratio of gas and primary air, it is advantageous and necessary for thorough mixing of the strong gas current from the injector nozzle with the air drawn in thereby from the surroundings to provide a longer path between the gas injector nozzle configuration and the combustion site. Preferably, thorough mixing can be realized by virtue of the fact that the gas injector nozzle is further constructed as a component of the gas fitting, which is aligned with the open inlet of the feed duct for the gas/air mixture of the outer burner. The configuration also leads to an expedient mechanical decoupling of the burner unit and fitting in this region.
Other features that are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a gas burner configuration for cooking areas, it is nevertheless not intended to be limited to the details shown because various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
REFERENCES:
patent: 2146660 (1939-02-01), Swartz
patent: 2162233 (1939-06-01), Schoenberger
patent: 2201077 (1940-05-01), Browning
patent: 2298771 (1942-10-01), Lamar
patent: 2509679 (1950-05-01), Evans
patent: 2781779 (1957-02-01), Kindl
patent: 2871930 (1959-02-01), Drow
patent: 36066
Gronnenberg Werner
Muhle Bernd
Naumann Jorn
BSH Bosch und Siemens Haus-geraete GmbH
Clarke Sara
Greenberg Laurence A.
Lazarus Ira S.
Lerner Herbert L.
LandOfFree
Gas burner configuration for cooking areas does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gas burner configuration for cooking areas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas burner configuration for cooking areas will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2599068