Metallurgical apparatus – Means sealing or opening aperture in vessel – By means plugging aperture
Patent
1990-07-06
1991-06-18
Seidel, Richard K.
Metallurgical apparatus
Means sealing or opening aperture in vessel
By means plugging aperture
222597, 266271, 164415, 164337, 164437, B22D 1110
Patent
active
050244221
ABSTRACT:
A one-piece refractory stopper rod has an axial bore formed therein for the introduction of inert gas into molten steel within a tundish. A metal bushing insert is copressed into the refractory stopper rod and has a threaded bore which is positioned coaxially with the bore of the stopper rod body. A metal attachment rod having an axial bore therethrough and a threaded lower shank portion is secured within the threaded bore of the metal bushing insert. The metal attachment rod has an upper threaded shank which is adapted to be secured to a stopper rod lifting mechanism associated with the tundish. The metal rod further includes a flanged portion intermediate the upper and lower shank portions which carries an annular chamfered surface. The annular chamfered surface faces a like annular chamfered surface formed in the bore of the stopper rod to define a gas-tight seal at a sealing interface therebetween. The upper shank includes an internally threaded portion adapted to receive a threaded fitting for the introduction of a pressurized inert gas to the stopper rod bore. The attachment between the metal rod and the refractory stopper rod provides increased strength, while minimizing gas leakage and air infiltration compared to prior stopper rod attachment configurations.
REFERENCES:
patent: 712111 (1902-10-01), Allendorfer
patent: 852644 (1907-05-01), Bacon
patent: 4155492 (1979-05-01), Seaton
patent: 4691901 (1987-09-01), Dobner
patent: 4791978 (1988-12-01), Fishler
patent: 4946083 (1990-08-01), Fishler et al.
Dubois Pascal
Fishler Mark K.
Koten Jean-Marie
Brown Edward A.
Seidel Richard K.
Vesuvius Crucible Company
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