| 摘要 |
<p>1,236,972. Induction heating apparatus. AJAX MAGNETHERMIC CORP. 4 July, 1968 [20 March, 1968], No. 32061/68. Heading H5H. A multi-section cross-field induction coil 14 or 14<SP>11</SP>, for uniformly heating one or more elongated metal slabs 17 of differing widths, has means for separately applying voltage to each coil section, e.g. A, B, C, D, E, the voltage being substantially proportional to the number of turns in each section. The coaxial coil sections may have the same turns and dimensions, Fig. 4 (not shown), or comprise a large coil section B, a smaller bottom coil section A, and a plurality of smaller, upper coil sections C, D, E, for heating slabs 17c, 17d, 17e, of differing widths. The voltage for the end coil sections is increased slightly to compensate for heat losses. Coil sections may be independently energized or deenergized to allow for loads of differing widths being heated. The coil 14 is vertically disposed, and slab 17 is raised into position for heating by a support beam 50. Coil 14 is water-cooled via inlet 18 and outlet 19, and has shields 28, 29, to reduce heat losses from the top of the coil. By means of autotransformers 34-37 the voltage in coil sections A, C, D and E can be varied. Power factor control capacitances 32 are connected in parallel across each coil section. Specifications 1,207,522 and 1,227,003 are referred to.</p> |
