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Electromagnetic Pump ^ ^ ^ ^ I ^ ^ ^ ^ ^ ^ II ^ II ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ I ^ European Patent Office Office europeen des brevets EP 0 711 025 A2 EUROPEAN PATENT APPLICATION (43) Date of publication: (51) |nt Cl.e: H02K 44/06 08.05.1996 Bulletin 1996/19 (21) Application number: 95307404.4 (22) Date of filing: 18.10.1995 (84) Designated Contracting States: • Dahl, Leslie Roy DE FR GB IT Livermore, California 94450 (US) • Patel, Mahadeo Ratilal (30) Priority: 04.11.1994 US 334644 San Jose, California 95111 (US) (71) Applicant: GENERAL ELECTRIC COMPANY (74) Representative: Pratt, Richard Wilson et al Schenectady, NY 12345 (US) London Patent Operation G.E. International Inc., (72) Inventors: Essex House, • Fanning, Alan Wayne 1 2/1 3 Essex Street San Jose, California 95112 (US) London WC2R 3AA (GB) • Olich, Eugene Ellsworth Aptos, California 95003 (US) (54) Electromagnetic pump (57) A support structure for clamping the inner coils and inner lamination rings of an inner stator column of an electromagnetic induction pump to prevent damag- ing vibration. A spine assembly, including a base plate, a center post and a plurality of ribs, serves as the struc- tural frame for the inner stator. Stacked alignment rings provide structure to the lamination rings and locate them concentrically around the spine assembly central axis. The alignment rings are made of a material having a high thermal expansion coefficient to compensate for the lower expansion of the lamination rings and, overall, provide an approximate match to the expansion of the inner flow duct. The net result is that the radial clamping provided by the duct around the stator iron is maintained (approximately) over a range of temperatures and op- erating conditions. Axial clamping of the inner stator structure is achieved via tie rods which run through grooves in the ribs and engage the base plate at the bottom of the inner stator and engage a clamping plate at the top. Slender tie rods and a flexible clamping plate are used to provide compliance in the axial clamping system to accommodate differential thermal growth (ax- CM ially) between the tie rods and lamination ring elements < without losing clamping force. CM O O Q_ LU Printed by Jouve, 75001 PARIS (FR) 1 EP0 711 025 A2 2 Description outer flow duct expands radially outward more than the lamination rings expand, causing the outer flow duct to The Government of the United States of America exert a radially outward clamping force on the lamination has rights in this invention in accordance with Contract rings. No. DE-AC03-89SF17445 awarded by the Department 5 However, when the lamination rings are radially in- of Energy. ward of the inner flow duct, as is the case for the double- stator design, the tendency - in the absence of remedial Related Patent Application measures - is for radial clamping by the inner flow duct to be lost as the inner stator is brought up to operating This application is a continuation-in-part application 10 temperature. In addition to radial clamping, means for of U.S. Patent Appln. Ser. No. 08/003,944 filed on Jan- axially and circumferentially clamping the coils and lam- uary 15, 1993, new US Patent 5382860 which is a con- ination rings of the inner stator structure must be pro- tinuation-in-part application of U.S. Patent Appln. Ser. vided. No. 07/836,475 filed on February 18, 1992, now issued as U.S. Patent No. 5,195,231. is Summary of the Invention Field of the Invention The present invention is a support structure for clamping the inner coils and inner lamination rings of an This invention is generally related to improvements inner stator column of an electromagnetic induction in annular linear-flow electromagnetic induction pumps 20 pump to prevent damaging vibration. In accordance with such as the type commonly used to circulate electrically the invention, clamping is provided in the axial, radial conducting liquid metal coolant through a liquid metal- and circumferential directions. cooled nuclear fission reactor plant. In accordance with the preferred embodiment of the invention, a spine assembly comprising a base plate, a Background of the Invention 25 center post and a plurality of ribs serves as the structural frame for an inner stator. This frame provides lateral ri- Annular linear flow electromagnetic induction gidity against seismic loading and a means of hanging pumps for impelling liquid metals generally comprise an the inner stator from above. annular flow channel or duct which is surrounded by a Further, a plurality of stacked alignment rings are stator column composed of a multiplicity of alternating 30 used to provide structure to the lamination rings and lo- annular coils and magnetic iron rings. This type of elec- cate them concentrically around the spine assembly tromagnetic pump, commonly known as a single-stator, central axis. The spine assembly is machined to provide annular linear-flow induction pump, and its use in a liquid a true cylindrical form over which the lamination rings metal-cooled nuclear fission reactor, are disclosed in U. are installed. S. Patent Nos. 4,859,885 and 4,882,514. 35 A further aspect of the invention is that the align- However, a more versatile linear-flow electromag- ment rings are made of a material having a high thermal netic induction pump design than those shown in the expansion coefficient (such as Type 304 stainless above patents comprises a double-stator system. This steel). This choice of material, in combination with the electromagnetic pump system comprises an outer sta- higher operating temperature at the interior of the inner tor arrangement surrounding the outer flow duct of an 40 stator, compensates for the lower expansion of the car- annular flow channel and an inner stator arrangement bon steel of the lamination rings and, overall, provides concentric with the outer stator and enclosed within the an approximate match to the expansion of the Type 304 inner duct of the annular flow channel. The inner and stainless steel inner flow duct. The net result, then, is outer stator columns are each composed of a multiplicity that the radial clamping provided by the duct around the of alternating annular coils and iron lamination rings. In 45 stator iron is maintained (approximately) over a range combination, the outer and inner, or double, stators act of temperatures and operating conditions. upon the liquid metal flowing linearly through the annular Each lamination ring comprises a plurality of lami- flow duct. nation packages which are attached to an associated This double-stator pump design provides greater alignment ring by mechanical fasteners. Registration of pumping capacity per pump unit size, or alternatively so the lamination packages to the alignment rings is equal capacity provided by a smaller pump unit. Accord- achieved via interlocking geometry. Additional radial ingly, among the advantages of the double-stator pump clamping of the lamination packages is achieved by cap- are greater efficiency and versatility. turing them between the alignment rings and the shrink- In the single-stator design, the stator column sur- fitted inner flow duct. rounds the outer flow duct of the annular flow channel. 55 Axial clamping of the inner stator structure is Because the outer flow duct is made of metal having a achieved via tie rods which run through grooves in the thermal expansion coefficient greater than that of the ribs and engage the base plate at the bottom of the inner carbon steel of the lamination rings therearound, the stator and engage a clamping plate at the top. Alloy 600 2 3 EP0 711 025 A2 4 is used for the tie rods to match the thermal expansion Detailed Description of the Preferred Embodiments coefficient of the carbon steel elements of the lamination rings while providing high-temperature structural stabil- Referring to FIG. 1, a double stator annular linear ity (i.e. creep resistance). flow, electromagnetic induction pump 10 for service in In accordance with another aspect of the invention, 5 electrically conductive liquid metal systems typically slender tie rods and a flexible clamping plate are used comprises the following assemblage of components. A to provide compliance in the axial clamping system to pump housing 1 2, commonly a cylindrical unit, encloses accommodate differential thermal growth (axially) be- the electromagnetic induction system and provides the tween the tie rods and lamination ring elements without necessary protection to enable the pump to operate losing clamping force. Additional axial clamping is 10 submerged within the aggressive environment of liquid achieved as a result of shrink fitting the inner flow duct sodium, which is commonly utilized as the coolant me- onto the inner stator column, so that duct shrinkage in dium in liquid metal cooled nuclear fission reactors. An the axial direction during cooling puts the inner stator inner stator 14 is secured and supported by means of a structure in axial compression. central support post or spine 32, to be described in detail Finally, the geometries of the spine, ribs and align- is below. ment rings create a plurality of coil-to-coil connection The double-stator electromagnetic pump 10 con- "bays". The number of these bays must be at least equal tains an annular flow channel 1 6 for magnetically impel- to (could be greater than) the number of power phases ling the passage of liquid metal therethrough. Annular being used in the pump, with one power phase per bay. flow channel 1 6 is defined by an outer flow duct 1 8 and Furthermore, the number of ribs/bays should be divisi- 20 an inner flow duct 20 concentric therewith. An inlet 22 ble into the numberof lamination packages by an integer provides entry to the annular flow channel 1 6, and outlet number to avoid interferences.
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