Pumps for pumping molten metal
First Claim
1. 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 a generally circular bore that can receive an impeller, a wall extending so as to form a spiral-shaped volute opening around the bore, and an egress channel that extends outwardly from said volute 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 a shell portion and a one-piece insert formed of nonmetallic heat-resistant material disposed in the impeller chamber. The insert includes a generally circular bore in which the impeller is disposed and a wall extending so as to form a spiral-shaped volute opening around the bore. An egress channel extends from the volute opening toward the molten metal outlet opening. Also included are methods for making the insert and base.
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Citations
29 Claims
- 1. 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 a generally circular bore that can receive an impeller, a wall extending so as to form a spiral-shaped volute opening around the bore, and an egress channel that extends outwardly from said volute opening.
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8. In a nonmetallic pump for pumping molten metal including a motor, a base with an impeller chamber, 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 the impeller chamber, the improvement wherein said base comprises a shell portion and a one-piece insert formed of nonmetallic heat-resistant material disposed in said impeller chamber, said insert comprising a generally circular bore in which the impeller is disposed, a wall extending so as to form a spiral-shaped volute opening around the bore and an egress channel that extends from said volute opening toward said molten metal outlet opening.
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16. A method of assembling a base of a nonmetallic pump for pumping molten metal comprising the steps of:
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positioning a one-piece insert of nonmetallic heat-resistant material into an impeller chamber of said base, said insert comprising a generally circular bore that can receive an impeller, a wall extending so as to form a spiral-shaped volute opening around the bore and an egress channel that extends outwardly from said volute opening; aligning said egress channel of said insert to extend toward a molten metal outlet opening from the base; and fastening said insert to said base. - View Dependent Claims (17, 18, 19)
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20. A method of fabricating a nonmetallic heat-resistant pump base for a pump for pumping molten metal comprising:
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forming a shell portion of nonmetallic heat-resistant material, said shell portion comprising a molten metal outlet opening, an impeller chamber, a lower opening of a size for receiving a one-piece insert and an impeller opening in an upper surface; positioning said one-piece insert into said lower opening of said shell portion and into said impeller chamber, said insert comprising a generally circular bore which can receive an impeller, a wall extending so as to form a spiral-shaped volute opening around the bore, and an egress channel extending outwardly from said volute opening; aligning said egress channel of said insert with said molten metal outlet opening of said shell portion; and fastening said insert to said shell portion. - View Dependent Claims (21, 22, 23)
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24. A method of fabricating a nonmetallic heat-resistant pump base for a pump for pumping molten metal comprising:
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forming a shell portion of nonmetallic heat-resistant material, said shell portion comprising a molten metal outlet opening, an impeller chamber, an upper opening of a size for receiving a one-piece insert and an impeller opening in a lower surface; positioning said insert into said upper opening of said shell portion and into said impeller chamber, said insert comprising a generally circular bore which can receive an impeller, a wall extending so as to form a spiral-shaped volute opening around the bore, and an egress channel extending outwardly from said volute opening; aligning said egress channel of said insert with said molten metal outlet opening of said shell portion; and fastening said insert to said shell portion. - View Dependent Claims (25, 26, 27, 28, 29)
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Specification