Dispensing – Molten metal dispensing – Flow controllers or assists
Patent
1996-09-24
1997-11-11
Kastler, Scott
Dispensing
Molten metal dispensing
Flow controllers or assists
266236, 222603, B22D 4114
Patent
active
056860080
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a closure and/or regulation apparatus for controlling the outflow from a metallurgical vessel, in particular for the close to final dimension casting of steel, and including a stator and a rotor rotatable relative thereto. The stator and rotor are provided with cooperating sealing surfaces and have through-passages or openings which terminate in the region of the sealing surfaces in an outflow channel, and which can be brought into and out of alignment by rotating the rotor.
DE 39 34 601 C1 discloses such a closure and/or regulation apparatus. Through a gas channel provided in the stator or in the rotor, insert gas can be supplied to a gas distribution chamber. This is said to decrease the wear of the sealing surfaces and through-passages or openings.
DE 38 10 302 C2 discloses a casting apparatus for the continuous manufacture of metal banding. A controlled gas pressure acts on the surface of a melt in a casting chamber in order to regular the height of the melt level. Such regulation is inert because it must act upon the entire volume of the melt. At the casting nozzle itself no further regulation capability is provided.
DE 38 05 071 C2 discloses a closure and/or regulation apparatus in which a rotor is rotatably supported in a stator transversely to the direction of flow of the melt. This design is especially suitable for continuous casting of banding or for thin slab casting.
In German Patent Application P 43 19 966, an immersion outlet is employed as a closure and/or regulation apparatus with a stator and a rotor. In an outflow channel is provided a sump chamber which broadens and makes uniform the melt flow for thin slab casting or band casting.
SUMMARY OF THE INVENTION
The invention provides a closure and/or regulation apparatus of the above type which, in addition to the mechanical capability of influencing the melt flow, also provides a further capability in order to be able to regulate responsively the melt flow near the outflow thereof.
According to the invention, the above achieved in an underpressure chamber is provided in the stator and/or the rotor. The underpressure chamber can be connected via a channel or conduit disposed in the stator and/or in the rotor with a vacuum generating unit, and is disposed above the through-passages or openings and is connected with the outflow channel.
Thereby, directly in the closure and/or regulation apparatus an underpressure is made effective. By controlling the underpressure, the rate at which the melt flows through the outflow channel is rapidly and responsively adapted to particular conditions, for example the bath level in the metallurgical vessel or the state of wear of the through-passages or openings. The underpressure counteracts the ferrostatic pressure of the melt in the vessel. By rotating the rotor, the melt flow additionally can be controlled.
BRIEF DESCRIPTION OF THE DRAWINGS
Further features and advantages of the invention are evident from the following description of exemplary embodiments, with reference to the drawings, wherein:
FIG. 1 is a cross section of a closure and/or regulation element wherein a rotor engages a stator from below;
FIG. 2 is a cross section of a closure and/or regulation element wherein a rotor extends from above a stator;
FIG. 3 is a cross section of the rotor according to FIG. 2;
FIG. 4 is a cross section of a further embodiment of a closure and/or regulation element wherein a rotor extends from above a stator;
FIG. 5 is a cross section of a closure and/or regulation element with a sump-forming chamber;
FIG. 6 is a cross section of a closure and/or regulation element wherein a rotor is supported in a stator rotatably about a transverse axis; and
FIG. 7 is a cross section of a closure and/or regulation element wherein a rotor extends from above and into a stator.
DETAILED DESCRIPTION OF THE INVENTION
Corresponding parts are provided with identical reference symbols in the various figures.
At the bottom of a metallurgical vessel is disposed a closure and/o
REFERENCES:
patent: 5025961 (1991-06-01), Hintzen et al.
patent: 5058784 (1991-10-01), Hintzen et al.
patent: 5160060 (1992-11-01), Hintzen et al.
patent: 5230813 (1993-07-01), Hintzen
Bruckner Raimund
Gimpera Jose
Lee Steve
Didier-Werke AG
Kastler Scott
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