Molten metal pump with filter
First Claim
Patent Images
1. A molten metal pump, comprising:
- a base member, the base member having a fluid inlet; and
a filter secured to the base member and defininga cavity therebetween, the filter completely surrounding the inlet, wherein the filter is made from bonded or sintered refractory material.
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Abstract
A molten metal pump includes a filter that prevents ingestion of foreign material such as dross from molten metal within which the pump is immersed. The filter is a large structure that is secured to the base of the pump surrounding the pump'"'"'s inlet. The filter forms a cavity adjacent the pump'"'"'s inlet. The ratio of the surface area of the filter to the inlet area of the pump is very large; the filter has a low porosity while maintaining a high flow rate for the pump.
128 Citations
19 Claims
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1. A molten metal pump, comprising:
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a base member, the base member having a fluid inlet; and a filter secured to the base member and defining a cavity therebetween, the filter completely surrounding the inlet, wherein the filter is made from bonded or sintered refractory material. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A molten metal pump, comprising:
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a base member, the base member having a bottom surface defining a circular shoulder portion and including a fluid inlet circumscribed by the shoulder portion; and a filter secured to the base member by means of a cemented connection with the shoulder portion, the filter and the bottom surface of the base member defining a cavity therebetween, the filter being formed of a bonded or sintered refractory material having a porosity within the range of about 35-38%. - View Dependent Claims (8, 9, 10)
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11. A method of filtering molten metal passed through a molten metal pump having a fluid inlet, comprising the steps of:
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providing a cup-like filter of bonded or sintered refractory material having a pre-determined porosity; attaching the filter to the pump such that the filter surrounds the fluid inlet; and drawing molten metal through the filter into the fluid inlet. - View Dependent Claims (12, 13, 14, 15)
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16. A filter for a molten metal pump, comprising:
a porous, refractory, cup-like member, the member being defined by a side wall and an end wall that closes the side wall, the side wall and the end wall creating a cavity. - View Dependent Claims (17, 18, 19)
Specification