A converged magnetic flux type electro-magnetic pump in which plural circular conductor plates provided with slits reaching peripheries from central holes in the plates and plural exciting spiral coils are alternately stacked with respect to each other and individually surrounded by magnetic frames.In-line pumps A high density traveling magnetic flux is generated by eddy currents concentrated around the central holes of the circular conductor plates in response to the application of a multiphase alternating voltage in a non-magnetic pipe passing through the central holes with a cylindrical iron core inserted in the pipe, so as to convey high temperature molten metal such as molten sodium used for refrigerating a high speed breeder reactor. The thickness of the central portions of the circular conductor plates is greater than the remainder of the plates,Magnetic pumps so as to form a radial T-shaped cross-section. Eddy currents concentrated in the central portions of the circular conductor plates are dispersed in the axial direction by increasing the thickness thereof, so as to prevent local overheating and to increase the applied voltage, effective magnetic flux and output thrust and hence improve the efficiency and molten metal conveyance.

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2011-12-22

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