| 摘要 |
PURPOSE:To effectively prevent the local overheating of a tank as well as to enhance the reliability of the titled magnetic shielding device by a method wherein a plurality of high permeability magnetic shielding plates, which are laminated in the direction vertical to and in parallel with the inner wall surface, and disposed in tension and circumferential part of a through hole is curved along the circumferential direction of the through hole. CONSTITUTION:The direction of lamination of a silicon steel plate is different from that heretofore in use by 90 deg. so that each block of a plurality of the magnetic shielding plates 8 provides side by side on the wall surface of a tank can be curved easily in the width direction of the shielding plates, and they are arranged vertical to the tank surface. Moreover, said shielding plates are curvedly arranged riftlessly almost along the outer circumference of the through hole located in the midway of the tank wall. Besides, the titled device is constructed in such a manner that the degree of curvature of the shielding plates becomes gentle as going away from the through hole 7, and it comes near gradually to a linear arrangement.
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