Nicholas S Walker

US Patent:

51606933, Nov 3, 1992

Filed:

Sep 26, 1991

Appl. No.:

7/766624

Inventors:

Charles E. Eckert - New Kensington PA
Nicholas G. Walker - West Chester PA

International Classification:

C22B 2106

US Classification:

266235

Abstract:

An improved impeller head is provided for treating molten metals and other liquid systems with a gas. A multiple-vaned impeller head is adapted for mounting on a hollow impeller shaft for rotation within the liquid. The edges of the impeller vanes are extended by an axial groove which intercepts the hub and the vanes of the impeller head. Extension of the trailing edge of the vanes creates greater turbulence in the liquid as the impeller is rotated in the liquid and increases the impeller's efficiency. The impeller vanes may also have canted leading surfaces which create an upward axial flow of liquid to discourage formation of a surface vortex. Multiple impellers may also be mounted on a shaft in the vessel and the gas may be introduced remotely.

US Patent:

53145259, May 24, 1994

Filed:

Sep 23, 1992

Appl. No.:

7/950412

Inventors:

Charles E. Eckert - New Kensington PA
Nicholas G. Walker - West Chester PA

International Classification:

C22B 2106

US Classification:

75583

Abstract:

An improved impeller head is provided for treating molten metals and other liquid systems with a gas. A multiple-vaned impeller head is adapted for mounting on a hollow impeller shaft for rotation within the liquid The edges of the impeller vanes are extended by an axial groove which intercepts the hub and the vanes of the impeller head. Extension of the trailing edge of the vanes creates greater turbulence in the liquid as the impeller is rotated in the liquid and increases the impeller's efficiency. The impeller vanes may also have canted leading surfaces which create an upward axial flow of liquid to discourage formation of a surface vortex. Multiple impellers may also be mounted on a shaft in the vessel and the gas may be introduced remotely.