Rotary degasser

An impeller block for dispersing gas into molten metal, said block formed of heat resistant material, said block comprising at least one gas inlet, at least one metal-transfer recess and at least one gas-transfer opening formed in said recess, and in communication with said gas inlet, said block connectable to a degasser shaft whereby said shaft turns said block thereby substantially entirely radially displacing the molten metal and gas is introduced into said gas inlet and passes out of said gas-transfer opening where it is sheared by the molten metal being displaced by the recess.

A coupling for connecting a hollow degasser shaft to a drive device, said coupling comprising an annular flange with an inner surface defining an opening and a generally cylindrical collar connected to, and extending perpendicularly from said annular flange;

• said collar comprising at least a first coupling member and a second coupling member and said annular flange comprising at least a first flange section connected to the first coupling member, and a second flange section connected to the second member;
• said coupling device further comprising a retainer and an adjustment device, said retainer being connected to said retainer and having a first position wherein said coupling is in a closed position, and is able to retain the hollow degasser shaft within said opening, and said adjustment device having a second position wherein said coupling is not retained in a closed position and can be moved to an open position, where the hollow degasser shaft is not retained within said opening.

In combination, a degasser shaft connected to a coupling for connecting a hollow degasser shaft to a drive device, said coupling comprising an annular flange with an inner surface defining an opening, and a generally cylindrical collar connected to, and extending perpendicularly from said annular flange;

• said collar comprising at least a first coupling member and a second coupling member and said annular flange comprising at least a first flange section connected to the first coupling member, and a second flange section connected to the second coupling member;
• said coupling device further comprising a retainer and an adjustment device, said retainer being connected to said first coupling member, said adjustment device being connected to said retainer and having a first position wherein said coupling is in a closed position, and is able to retain the hollow degasser shaft within said opening, and said adjustment device having a second position wherein it does not contact said second coupling member and said coupling can be moved to an open position where the hollow degasser shaft is not retained within said opening.