Variable delivery pump for molten metal
Patent 5509791 Issued on April 23, 1996. Estimated Expiration Date: 
May 27, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 27, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2468704 3010402 3291473 3612715 3776660 3836280 Centrifugal slurry pump Dual volute molten metal pump and selective outlet discriminating means Molten metal pump Submerisble molten metal pump Patent #: 5203681 InventorApplicationNo. 250622 filed on 05/27/1994US Classes:417/238, CHANGEABLE BY ASSEMBLY OR DISASSEMBLY415/88, PUMP HAVING ROTATING INLET END OR SCOOP IMMERSED IN LIQUID415/131, Axially adjusted417/424.1, Supported for rotation on vertical axis417/430INCLUDING MEANS TO (1) AGITATE PUMP FLUID, OR (2) PREVENT FOREIGN MATERIAL SETTLING FROM PUMP FLUIDExaminersPrimary: Bertsch, Richard A.Assistant: Wicker, William Attorney, Agent or FirmInternational ClassesF04B 039/14F04D 001/14 AbstractA pump for use in a bath of reactive molten metal such as zinc has a graphite rotor, driven at constant speed, and capable of pumping molten metal at selective rates from the bath. The pump includes an internal delivery flow path and protected drive shaft, so that the liquid metal of the bath is not turbulated by the rotating shaft, and the temperature of the metal within the pump, during semi-quiescent periods is maintained substantially constant. The pump has a robust structure and yet can handle rates as low as 10 to 15 pounds per minute, in contrast to usual types of pumps that require pumping about 80 pounds per minute, and being speed controlled, are less accurate in their delivery rates. An adjustable control for regulating flow rate during operation also is provided.Field of SearchCHANGEABLE BY ASSEMBLY OR DISASSEMBLYSupported for rotation on vertical axis INCLUDING MEANS TO (1) AGITATE PUMP FLUID, OR (2) PREVENT FOREIGN MATERIAL SETTLING FROM PUMP FLUID PUMP HAVING ROTATING INLET END OR SCOOP IMMERSED IN LIQUID CENTRIFUGAL BOWL PUMP RUNNER OR BLADE SELECTIVELY ADJUSTABLE RELATIVE TO CASING Axially adjusted Specific casing or vane material Downstream of runner With runner shaft of specific shape or material | |
