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Electromagnetic pumpRelated Patent Categories: Pumps, Electrical Or Getter Type, ElectromagneticElectromagnetic pump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080050247, Electromagnetic pump. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This is a divisional application of application Ser. No. 10/825,634, filed Apr. 15, 2004, which application claims the benefit of U.S. Provisional Application No. 60/464,317, filed Apr. 21, 2003, both of which applications are hereby incorporated herein by reference in their entireties. FIELD OF THE INVENTION [0002] The present invention relates to electromagnetic pumps that move an electrically conductive fluid by interaction with magnetic fields. BACKGROUND OF THE INVENTION [0003] Electromagnetic pumps can be used to pump electrically conductive fluids, such as an electrically conductive molten metal composition. An advantage of an electromagnetic pump is that the fluid can be magnetically induced to move through a tube or conduit without the use of mechanical pump components inside of the conduit. [0004] Known electromagnetic pumps are either submersed in, or integrally attached to, the source of the electrically conductive fluid, such as a metal melting and/or melt holding furnace. These pump installations are difficult to service and maintain. Therefore there is the need for an efficient and easily maintainable electromagnetic pump that is not integrally attached to the source of the electrically conductive fluid. BRIEF SUMMARY OF THE INVENTION [0005] In one aspect, the invention is apparatus for and method of pumping an electrically conductive material in a pump having a supply section or volume, and a magnetic force pumping section or volume. In one example of the invention the directional flow of the material through the supply section is opposite to the directional flow of the material through the magnetic force pumping section. Multiple coils surround the supply and magnetic force pumping sections. Current flowing through the multiple coils creates magnetic fields that magnetically couple with a magnetic material disposed between the supply and magnetic force pumping sections so that the fields penetrate the electrically conductive material in the magnetic force pumping section substantially perpendicular to the desired flow direction. This field orientation maximizes the magnitudes of the magnetic forces applied to the electrically conductive material in the magnetic force pumping section. [0006] These and other aspects of the invention are set forth in the specification and the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS [0007] The figures, in conjunction with the specification and claims, illustrate one or more non-limiting modes of practicing the invention. The invention is not limited to the illustrated layout and content of the drawings. [0008] FIG. 1 is a side perspective view of one example of an electromagnetic pump of the present invention. [0009] FIG. 2 is a side elevational view of one example of an electromagnetic pump of the present invention. [0010] FIG. 3(a) is a side sectional view through line A-A in FIG. 2 of one example of an electromagnetic pump of the present invention. [0011] FIG. 3(b) is a top sectional view through line B-B in FIG. 2 of one example of an electromagnetic pump of the present invention. [0012] FIG. 3(c) is a partial sectional view of the interface region for inner, mid and outer tubes, and magnetic material, used in one example of an electromagnetic pump of the present invention. [0013] FIG. 4(a) is a simplified schematic diagram of a power supply and power distribution to induction coils used with an electromagnetic pump of the present invention. [0014] FIG. 4(b) is a vector diagram illustrating one example of phase distribution of the output of a power supply to the induction coils used with an electromagnetic pump of the present invention. [0015] FIG. 5 is a side sectional view of another example of an electromagnetic pump of the present invention. DETAILED DESCRIPTION OF THE INVENTION [0016] Referring now to the drawings, wherein like numerals indicate like elements, there is shown in the figures one example of electromagnetic pump 10 of the present invention for pumping an electrically conductive material, such as an electrically conductive molten metal. In FIG. 1, twelve induction coils (12a through 12l) as further described below, are surrounded by a plurality of vertical magnetic shunts 14 held in place by shunt supports 16, which are attached to base 18 at one end, and to yoke 20 at the opposing end. The base and yoke may optionally be formed from a magnetic material to provide bottom and top magnetic field containment. Other shunt and outer support arrangements as known in the art may be used in lieu of the shunt and support arrangements shown in FIG. 1. Pump inlet 24 and pump outlet 22 in this non-limiting example of the invention, are cylindrically formed from a suitable heat-resistant material. [0017] Referring now to FIG. 3(a), which is a side sectional of electromagnetic pump 10 shown in FIG. 2, optional thermal insulator 26 separates the induction coils from the interior of the pump and provides a means for molten metal (melt) heat retention for melt in the pump. In this non-limiting example of the invention, the thermal insulator is substantially shaped as an open cylinder bounded by base 18 and yoke 20. Outer tube 28 in this non-limiting example of the invention, is a substantially cylindrically-shaped tube that has a closed rounded bottom and an opened top with a protruding lip around the opening. The outer tube's lip sits on top of yoke 20. First closing means 30 seats over yoke 20 and the protruding lip of the outer tube. Second closing means 32 seats over first closing means 30. Outlet 22 is disposed between the first and second closing means. Mid tube 34 in this non-limiting example of the invention is a substantially cylindrically-shaped tube that is opened at both ends with the upper end having a protruding lip around the opening. The mid tube's lip is seated in a recess in second closing means 32. The first and second closing means are arranged to form an outlet annular volume 42 that connects the interior passage of outlet 22 to riser annular volume 44 that is disposed between the outer wall of mid tube 34 and the inner wall of outer tube 28. Third closing means 36 seats over second closing means 32. Inner tube 40 in this non-limiting example of the invention is a substantially cylindrically-spaced tube that has an open bottom and a closed top. As best seen in FIG. 3(c) the perimeter of the inner tube's open bottom forms a fluid tight seal with the perimeter of the mid tube's open bottom. Magnetic material 46 is disposed in a volume between the outer wall of inner tube 40 and the inner wall of mid tube 34 as further described below. Fourth closing means 38 seats over third closing means 36 and the closed top of inner tube 40. Inlet 24 is disposed between the third and fourth closing means and its interior passage is connected to the interior passage of inner tube 40. FIG. 3(b) is a sectional view that illustrates the spatial relationship of components in a horizontal plane. [0018] The above non-limiting examples of the invention provide a convenient means for assembly or disassembly of pump 10. Removal of fourth closing means 38 allows inlet 24 and inner tube 40 to be raised out of the pump. Further removal of third closing means 36 allows magnetic material 46 and mid tube 34 to be raised out of the pump. Further removal of second closing means 32 allows removal of outlet 22. Further removal of first closing means 30 allows removal of outer tube 28. Continue reading about Electromagnetic pump... Full patent description for Electromagnetic pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Electromagnetic pump 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. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Electromagnetic pump or other areas of interest. ### Previous Patent Application: Fluid system with pump activation device Next Patent Application: Method for transportation of liquids by steam or compressed air and a device for realization of the method Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Electromagnetic pump patent info. 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