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US 9,903,383 B2Granted
Molten metal rotor with hardened top
AssigneeMolten Metal Equipment Innovations, LLC
InventorPaul V. Cooper
Life of this patent
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Abstract
Embodiments of the invention are directed to a rotor for a molten metal pump and a molten metal pump including the rotor. The rotor has a main body and a top comprised of a material that is at least twice as hard as the main body. The top, among other things, may form a first portion of each rotor blade wherein the first portion directs molten metal into a pump chamber or other structure in which the rotor is mounted.
Claims38
A rotor for use in a molten metal pump, the rotor comprising
- (a) a graphite body;
- (b) a plurality of blades, wherein each blade has a first portion and a second portion, wherein the first portion is above the second portion and is configured to push molten metal downwards towards the second portion, and the second portion is configured to push the molten metal outward;
- (c) a hardened top portion comprising material at least twice as hard as the graphite body;
- (d) wherein the hardened top portion forms at least part of the first portion and at least part of the second portion.
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A rotor that includes a top surface and a bottom;
- a plurality of imperforate rotor blades for displacing molten metal, wherein each of the plurality of rotor blades includes a horizontally-oriented first portion with a surface angled at 30 degrees to 60 degrees that is configured to push molten metal downward, and a second portion beneath the first portion that is configured to push molten metal outward, a trailing face, and a recess that reduces the area of the top surface to help permit molten metal to pass therethrough and into pump chamber;
- wherein the plurality of imperforate rotor blades are comprised of graphite;
- and
- the top surface is comprised of ceramic.
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Dependencies are inferred from the claim text.