Rotary degassers and components therefor

摘要

Disclosed are degassers, couplings, impeller shafts and impellers for use in molten metal. One such coupling transfers gas into an impeller shaft, the coupling having a smooth, tapered internal surface to align with a corresponding surface on the impeller shaft and help prevent gas leakage and to assist in preventing damage to the impeller shaft. Improved impellers for shearing and mixing gas are also disclosed, as is a degasser including one or more of these components.

主权项

1. An impeller having a top surface and a bottom surface, the impeller for dispersing gas into molten metal and comprising:
a continuous, axially aligned passage through the impeller, and through which gas can be transferred from the top surface to the bottom surface; the passage terminating at an opening in the bottom surface through which gas can be released; and at least one open channel on the bottom surface of the impeller in communication with the opening in the bottom surface of the impeller, the at least one open channel for directing the gas; and at least one cavity comprising a top surface and at least one curved side surface defined by a radius and terminating at an edge, and the at least one channel extending from the center of the impeller through the center of the at least one curved side surface of the cavity to direct gas therein; wherein the edge is a shearing structure that shears gas existing the at least one cavity.