| 摘要 |
A rotary degasser for removing impurities from molten metal is disclosed that includes a degasser shaft, an impeller block and a coupling. The shaft is preferably hollow to allow for the passage of gas therethrough. The impeller block is connected to the degasser shaft, is formed of heat resistant material and has at least one metal-transfer recess, which displaces molten metal when the block is rotated. The block preferably includes at least one gas inlet in communication with the hollow portion of the degasser shaft and a gas-release opening formed in each metal-transfer recess. Each gas-release opening communicates with one of the gas inlets. The coupling connects the degasser shaft to a drive shaft and is formed of two or more coupling members. The coupling has a closed position in which it retains the degasser shaft and an open position in which it does not retain the degasser shaft. The coupling also includes a retainer that is connected to one of the coupling members and an adjustment device connected to the retainer. The adjustment device has a first position in which the coupling is retained in its closed position and a second position in which the coupling is not retained in its closed position and can be moved to its open position.
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