RISERLESS TRANSFER PUMP AND MIXER/PRE-MELTER FOR MOLTEN METAL APPLICATIONS
First Claim
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1. A molten metal pump comprising:
- an elongated body having a vertical straight tube having an internal cavity defined by an inner wall which tapers down and terminates in a parabolically-shaped bottom end; and
a centrifugal impeller seated in an opening formed in the center of said bottom end, wherein molten metal ejected from the impeller is received by the parabolically-shaped bottom end;
whereby rotation of the impeller results in the ejected flow of molten metal to create a vortex which climbs the inner wall to an outlet opening passing through an upper portion of said body.
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Abstract
A pump for processing molten metal having an enlarged tubular body which houses a centrifugal pump at its bottom end. The bottom end has a parabolic shape which receives the ejected molten metal from the impeller and forms a vortex within the tubular body. The pump is controlled to cause the vortex to climb up the inner wall of the body up to and out of an outlet formed in the upper end of the body. A radial vane impeller is formed in the back plate of the impeller. When the impeller is rotated, solid particles introduced into the body are accelerated radially by the back plate impeller into the vortex.
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Citations
17 Claims
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1. A molten metal pump comprising:
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an elongated body having a vertical straight tube having an internal cavity defined by an inner wall which tapers down and terminates in a parabolically-shaped bottom end; and a centrifugal impeller seated in an opening formed in the center of said bottom end, wherein molten metal ejected from the impeller is received by the parabolically-shaped bottom end; whereby rotation of the impeller results in the ejected flow of molten metal to create a vortex which climbs the inner wall to an outlet opening passing through an upper portion of said body. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A pump which is immersible in a bath of molten metal, comprising:
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a vertical riser tube having an inner wall which defines an internal cavity and having outlet means formed at an upper end of the tube which fluidly connects the internal cavity to transfer means external to said riser tube; a centrifugal impeller rotatably seated coaxially within an opening formed in the center of a bottom end of said riser tube, wherein molten metal ejected from the impeller is received by said inner wall; whereby rotation of the impeller results in the ejected molten metal to create a vortex within said riser tube and along said inner wall, said vortex climbs the inner wall to said outlet means. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of processing molten metal, comprising the steps of:
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providing a pump including a vertical riser tube and a centrifugal impeller rotatably seated coaxially within an opening formed through a bottom end of said riser tube, wherein said impeller has liquid inlets facing downwardly out of riser tube; immersing said bottom end of said pump within a bath of molten metal; rotating said impeller within said riser tube to pull molten metal into said liquid inlets and accelerate said molten metal both radially and tangentially within said riser tube such that molten metal ejected from the impeller forms a vortex along an inner wall of said riser tube; and controlling the speed of said impeller to cause said vortex to climb said inner wall up to and out of an outlet formed in an upper end of said riser tube above a metal line of said molten metal bath. - View Dependent Claims (15, 16, 17)
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Specification