Apparatus for stirring glass melts
AssigneePlansee Tizit Aktiengesellschaft
InventorsHermann Walser, Hans-Peter Martinz
Life of this patent
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Abstract
The invention pertains to a stirrer apparatus for glass melts. A stirring element and a stirrer shaft are provided, each comprised of a metal or a metal alloy having a high melting point temperature. A drive shaft for the stirring element comprises a different metallic material, for example an ODS alloy on the basis of iron or nickel. The junction between the stirrer shaft and the drive shaft is located approximately in the region in which the level of the surface of the glass melt is located during use. The end portion of the drive shaft or the end portion of the stirrer shaft, which can be covered by the melt during use, are isolated by a platinum casing.
Claims9
A stirrer apparatus for stirring a glass melt comprising:
- a stirring element comprising an impeller and a shaft element, both made of a refractory metal or a refractory metal alloy as a first metal;
- a drive shaft constructed of a second non-refractory metal or alloy, said shaft element and said drive shaft each having an end portion, the end portion of the shaft element being adapted to mechanically attach to the end portion of the drive shaft;
- and
- a casing made of platinum and disposed over at least one of the end portions of the shaft element and the drive shaft over a length suitable to isolate at least one of said end portions against corrosive attack from the glass melt within a range of surface levels of the glass melt, said casing not extending substantially above a maximum level of the glass melt and not extending substantially below a minimum level of the glass melt.
Dependencies are inferred from the claim text.