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PumpingRelated Patent Categories: Pumps, Electrical Or Getter TypePumping description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070140868, Pumping. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This invention concerns improvements in and relating to pumping, particularly of molten metal. [0002] A variety of prior art systems for pumping or otherwise moving molten metal from one location to another exist. These systems are based around a layout which includes a conduit leading into the pump from one side, the pumping location and a further conduit leading away from the pump on another side. The conduit and further conduit are separate from one another and separately connected to the location or locations from which the pump receives the metal to be pumped and to which the pump pumps the metal. [0003] Such systems take up significant space and require two sets of appropriate connections and conduits. [0004] The present invention has amongst its aims to provide an alternative molten metal mover. The present invention has amongst its aims to provide a pump for molten metal which requires less space to operate and/or requires less connections to operate. [0005] According to a first aspect of the invention we provide a pump for molten metal, the pump comprising a tube, the tube being open at one end and closed at the other end, one or more side walls extending between the open and closed ends, an electrical conductor being wrapped around the tube, a secondary tube being provided within the tube, the secondary tube having a through aperture extending from a first end to a second end and being spaced from at least a part of the side wall of the tube and at least a part of the closed end of the tube. [0006] The internal profile of the tube may be configured to promote flow into the tube at the periphery of the tube and/or to promote flow out of the tube at the centre of the tube, preferably at the same time. [0007] According to a second aspect of the invention we provide a pump for molten metal, the pump comprising a tube, the tube being open at one end and closed at the other end, one or more side walls extending between the open and closed ends, an electrical conductor being wrapped around the tube. [0008] The internal profile of the tube may be configured to promote flow into the tube at the periphery of the tube and/or to promote flow out of the tube at the centre of the tube, preferably at the same time. [0009] Preferably a secondary tube is provided within the tube. The secondary tube may have a through aperture extending from a first end to a second end. The secondary tube may be spaced from at least a part of the side wall of the tube and at least a part of the closed end of the tube. [0010] The first and/or second aspects may further include the following features, options or possibilities. [0011] The tube may be of refractory, for instance silicon carbide. The tube may extend along an axis. The tube may be of circular cross-section. Preferably the tube is of constant cross-section between the open end and the start of the closed end. [0012] The open end of the tube may be of circular cross-section, preferably perpendicular to its axis. The open end of the tube may be connected to a vessel, for instance a furnace, holding furnace or the like. A mounting element provided around at least a part of the open end may be used to mount the pump on the vessel. The open end of the tube may abut a part of the vessel, for instance a refractory lining. The open end of the tube may have a diameter of between 10 to 50 cm. [0013] The closed end of the tube may be formed by a tapering of the side walls and/or cross-sectional shape of the tube. The closed end may be formed of a series of circular cross-sections of decreasing diameter. The closed end of the tube may be dome shaped, particularly a dome in which the internal profile of the dome is exposed to the inside of the tube. The closed end of the tube may initially dome inwards, and preferably has a middle portion which extends back towards the open end of the tube. The middle portion may be dome shaped, particularly a dome in which the external profile of the dome is exposed to the outside of the tube. [0014] Preferably the tube has a single side wall. [0015] The electrical conductor is preferably wrapped around the tube in a single coil. The electrical conductor may be spaced from the tube, for instance by an insulator and/or magnetic field enhancing material. The electrical conductor may be clamped in position, preferably relative to the tube. The clamping may be provided by a framework which encloses the tube and conductor. Locations for mounting the pump on a vessel may also be provided on the framework. [0016] Preferably connections are provided for attaching the electrical conductor to a power supply. [0017] The secondary tube may be of refractory material, for instance silicon carbide. The secondary tube may extend along an axis, preferably the same axis as the tube. The secondary tube may be of circular cross-section. Preferably the secondary tube is of constant cross-section between its open ends. [0018] The first and/or second open ends of the secondary tube may be of circular cross-section, preferably perpendicular to its axis. The first open end of the tube may be in fluid connection with a vessel, for instance a furnace, holding furnace or the like, and particularly the same vessel as the tube is in fluid location with. Preferably both the open end of the tube and the first open end of the secondary tube are in fluid connection with the vessel through a single opening in the vessel. The first and/or second open ends of the secondary tube may have a diameter of between 5 to 25 cm. Preferably the first and/or second open ends of the secondary tube have a diameter half the diameter of the tube. Preferably the open end of the tube has a cross-sectional area which is between 3 and 5 times the cross-sectional area of the first and/or second open ends of the secondary tube. [0019] Preferably the secondary tube has a central axis and ideally a central axis which corresponds with the central axis of the tube. Preferably the first end of the secondary tube is flush with or recessed relative to the open end of the tube. [0020] Preferably the through aperture is of circular cross-section. Preferably the through aperture is of consistent cross-section throughout. Preferably the through aperture extends from proximate the open end of the tube to proximate the closed end of the tube. The through aperture may start within 5 to 30 cm of the closest part of the closed end of the tube to it. The through aperture may extend to or within 10 cm of a plane defined by the end surface of the open end of the tube. [0021] The secondary tube may be spaced from the tube by one or more spanning portions. The one or more spanning portions may span the gap between the outside of the secondary tube and the inside of the tube. Preferably at least three spanning portions are provided. Preferably the spanning portions are evenly spaced around the secondary tube. The spanning portions may be separate from one another and/or separate from the tube and secondary tube or may be an integral part of the tube or are preferably an integral part of the secondary tube. The spanning portions may be provided along part of the length of the tube and/or secondary tube. The spanning portions may be provided for between 50% and 90% of the length of the secondary tube. The spanning portions may have an outer surface at least a part of which has a profile configured to match the internal profile of at least a part of the tube. The part may have a profile configured to match the side wall of the tube. The part may have a profile configured to match at least a part of the closed end of the tube. The spanning portions may be in the form of pillars provided on the secondary tube. [0022] Preferably the secondary tube is spaced from the tube at all locations other than those of the spanning portions. Preferably the spacing defines one or more passageways between the inside of the tube and the outside of the secondary tube. A passageway may be defined between each pair of spanning portions. Preferably the secondary tube is spaced from the tube equally in all radial directions. The spacing between the side of the secondary tube and the side of the tube may be between 15 cm and 50 cm. Preferably the second end of the secondary tube is spaced from the closed end of the tube in all directions. The second end of the secondary tube may have a spacing of between 5 cm and 30 cm relative to the closed end of the tube. [0023] According to a third aspect of the invention we provide a method of moving molten metal, the method comprising [0024] providing a pump in fluid communication with a volume of molten metal, the pump comprising a tube, the tube being open at one end to the molten metal and closed at the other end, one or more side walls extending between the open and closed ends of the tube; Continue reading about Pumping... Full patent description for Pumping Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Pumping patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. 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