| 摘要 |
An apparatus for reducing the noise level of a stream of air exiting a tapping crucible in aluminum reduction operations. The air is used to create a vacuum in the tapping crucible, thereby promoting siphon removal of molten aluminum from the reduction cell. The apparatus of this invention, commonly referred to as a muffler, comprises an outer conduit having entrance and exit openings, an inner conduit centrally attached within said outer conduit, said inner conduit having an entrance opening, an exit opening enclosed with a cup welded to said inner conduit, and exhaust slots equally spaced around said inner conduit's circumference.
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