Industrial electric heating furnaces – Induction furnace device – For charging or discharging
Patent
1999-06-04
2000-04-18
Hoang, Tu Ba
Industrial electric heating furnaces
Induction furnace device
For charging or discharging
373 59, 373 79, F27D 300
Patent
active
060524030
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an inductor for generating an electromagnetic AC field at a discharge element of a melt vessel through which, for the purpose of cooling, flows a cooling fluid.
2. State of the Prior Art
In DE 195 00 012 A1 is described an inductor in a regulation and closure device of a metallurgical vessel which comprises a stator disposed in the vessel wall and a rotor rotatable in the stator for choking or shutting off the melt flow (a pipe-in-pipe closure system). Cooling takes place uniformly by means of a single cooling fluid. For reasons of safety, compressed air is used as the cooling fluid so that in the event of leakage, for example through wear of the vessel wall, water vapor or oxyhydrogen gas cannot develop.
In an older patent application, 196 03 317.9-34, it is specified that the inductor, during an operating phase, is cooled with liquid gas, and with air during a stand-by phase. Cooling with water is also avoided here.
GB 22 79 543 A describes a two-part inductor with separate electrical connections at the discharge element of a melt vessel. Nothing is mentioned about cooling.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an inductor of the above described type so that it can be operated with differing cooling means for the purpose of being able to adapt to various cooling requirements.
According to the present invention, the above object is achieved through the following characteristics of the invention. An inductor is provided with different regions with separate conveyances for conveying the cooling fluid to and from the region. It is thereby possible to act upon the differing regions of the inductor simultaneously or successively with different cooling fluids. This permits the cooling in the individual regions to be adapted to the particular requirements obtaining at the regions. It is, in particular, possible to carry out cooling in a region in the proximity of a danger zone in which the use of water as a cooling means is dangerous, by means of a gas, and in particular by air. The danger zone is located where the inductor is closest to the melt disposed in the melt vessel because at this location, due to wear and/or the formation of cracks in the wall of the melt vessel, it is possible for the melt to come into contact with the inductor. In other regions, water or water vapor can be used for cooling.
For a particular region of the inductor, the cooling fluid is always used which, in each instance, is most suitable for cooling the region and its environment. The various cooling fluids are preferably liquid gas or dry ice or water or water vapor or gas or compressed air. When using gases as the cooling fluid, which is especially preferred in danger zones, it is also possible, in order to adapt to the cooling performance required in each instance, to use a variably adjustable ratio of several gases, for example compressed air and supercooled air or nitrogen or carbon dioxide or oxygen or the like. By using differing cooling fluids, and thus different cooling performances, in the individual regions of the inductor, the electromagnetic AC field generated by the inductor can be utilized for differing functions. These include, in particular, inductive heating and/or the generation of a reference field for temperature measurements and/or slag detection and/or generation of a directed electromagnetic field for the purpose of exerting a force component onto the melt, which, for example, can be used for gap sealing in the discharge element.
The regions of the inductor can preferably be acted upon with differing electric frequencies and/or differing electric powers depending on the purpose of the particular region.
BRIEF DESCRIPTION OF THE DRAWING
Further advantages and features of the present invention will become evident from the following description of a preferred embodiment with reference to the accompanying FIGURE.
The FIGURE depicts an inductor for a discharge element, implemented as a pipe-i
REFERENCES:
patent: 1681950 (1928-08-01), Northrup
patent: 2277223 (1942-03-01), Goodridge
patent: 3014255 (1961-12-01), Bussard et al.
patent: 4455014 (1984-06-01), Genies
patent: 4972899 (1990-11-01), Tungatt
patent: 5479438 (1995-12-01), Blum et al.
patent: 5901169 (1999-05-01), Kobayashi
Patent Abstract of Japan 60021170, Feb. 1985.
Bruckner Raimund
Grimm Daniel
Didier Werke AG
Hoang Tu Ba
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