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US 4,898,367 AGranted
Dispersing gas into molten metal
AssigneeStemcor Corporation
InventorPaul V. Cooper
Life of this patent
Estimating the term…
Abstract
Gas is dispersed into molten metal by immersing a shaft-supported impeller into the molten metal and by pumping gas through the shaft and out of the impeller. The impeller is in the form of a rectangular prism having sharp-edged corners that shear the gaas into finely divided bubbles. The particular shape of the impeller provides an especially effective bubble-shearing and bubble-dispersing action.
Claims10
Apparatus for dispersing gas into molten metal, comprising:
- an impeller in the form of a rectangular prism having upper and lower faces, a width (A), a depth (B), and a height (C), with (A) being equal to (B), the impeller having a gas discharge outlet opening through the lower face of the prism;
- an elongate, rotatable shaft rigidly connected to the impeller and projecting from the upper face of the impeller;
- and
- means for conveying gas to the gas discharge outlet, whereby gas to be dispersed into molten metal can be pumped along the lower face of the impeller.
1 more element
Apparatus for dispersing gas into molten metal, comprising:
- an impeller in the form of a rectangular prism having upper and lower faces, a width (A), a depth (B), and a height (C), with (A) being equal to (B) and (C) being equal to about 1/3 (A), the impeller having a threaded opening extending through the center of the upper and lower faces of the prism;
- and
- an elongate shaft having first and second ends, the first end adapted to be connected to a source of gas and the second end being threaded for connection to the opening in the impeller, the shaft having a longitudinally extending bore in fluid communication with the opening in the impeller, whereby gas to be dispersed into molten metal can be pumped through the shaft and out of the impeller along the lower face of the impeller.
Dependencies are inferred from the claim text.