Pumps for pumping molten metal
First Claim
1. In a pump for pumping molten metal comprising a motor, a base, at least one molten metal inlet opening to said base, a molten metal outlet opening from the base, a shaft having a first end connected to the motor, and an impeller connected to a second end of the shaft and rotatable in an interior of said base, wherein said base, said shaft and said impeller are comprised of refractory material, the improvement wherein said base comprises an impeller opening in which said impeller is rotatably disposed, said impeller opening extending toward an end face of said base, a wall extending in the interior of said base so as to form a spiral shaped opening around said impeller opening, a recess disposed around said impeller opening and formed by a first surface which extends to and is integrally formed with said wall and a second surface which extends between said first surface and said end face, and a bearing ring disposed in said recess and disposed around said impeller opening.
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Accused Products
Abstract
A nonmetallic pump for pumping molten metal includes a base with an impeller chamber, at least one molten metal inlet opening to the base, at least one molten metal outlet opening from the base, and an impeller connected to one end of a motor driven shaft and rotatable in the impeller chamber. The base includes an impeller opening in which the impeller is disposed and a wall extending so as to form a spiral-shaped opening around the impeller opening. An egress channel extends from the spiral-shaped opening toward the molten metal outlet opening.
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Citations
28 Claims
- 1. In a pump for pumping molten metal comprising a motor, a base, at least one molten metal inlet opening to said base, a molten metal outlet opening from the base, a shaft having a first end connected to the motor, and an impeller connected to a second end of the shaft and rotatable in an interior of said base, wherein said base, said shaft and said impeller are comprised of refractory material, the improvement wherein said base comprises an impeller opening in which said impeller is rotatably disposed, said impeller opening extending toward an end face of said base, a wall extending in the interior of said base so as to form a spiral shaped opening around said impeller opening, a recess disposed around said impeller opening and formed by a first surface which extends to and is integrally formed with said wall and a second surface which extends between said first surface and said end face, and a bearing ring disposed in said recess and disposed around said impeller opening.
- 8. A base for a pump for pumping molten metal comprised of refractory material, said base comprising at least one molten metal inlet opening and a molten metal outlet opening, said inlet opening and said outlet opening communicating with an interior of said base, an impeller opening in which an impeller can be rotatably disposed, said impeller opening extending toward an end face of said base, a wall extending in the interior of said base so as to form a spiral shaped opening around said impeller opening, a recess disposed around said impeller opening and formed by a first surface which extends to and is integrally formed with said wall and a second surface which extends between said first surface and said end face, and a bearing ring disposed in said recess and disposed around said impeller opening.
- 14. A one-piece insert for a base of a pump for pumping molten metal, said insert being formed of nonmetallic heat-resistant material and comprising an impeller opening that can receive an impeller, a wall extending so as to form a spiral-shaped opening around said impeller opening, and an egress channel that extends outwardly from said spiral-shaped opening.
- 21. In a pump for pumping molten metal including a motor, a base, at least one molten metal inlet opening to the base, a molten metal outlet opening from the base, a shaft connected to the motor at one end, and an impeller connected to the other end of the shaft and rotatable in an interior of said base, said base, said impeller and said shaft being comprised of refractory material, the improvement wherein said base comprises a one-piece insert formed of nonmetallic heat-resistant material disposed in the interior of said base, said insert comprising an impeller opening in which the impeller is disposed, a wall extending so as to form a spiral-shaped opening around said impeller opening and an egress channel that extends from said spiral-shaped opening toward said molten metal outlet opening.
Specification