| 摘要 |
The present invention relates to the field of electromagnetic induction and short circuit heating. The iron core in the heating device of present invention, which is in the form of EI, is completely made of multi-layered silicon steel sheets to form a closed three-phase magnetic loop; each of the three core legs of the EI-formed iron core is coiled with a winding, i.e. the three-phase primary winding; the iron core and the three-phase primary windings are all enclosed in a metal shell, which is the secondary side that surrounds the iron core and the primary winding of each phase along the closed three-phase magnetic loop to constitute the main heating body of this heating device, in addition to act as a protecting shell and a radiator for the iron core and the three-phase primary winding. During operation, high current is induced in each secondary metal ring of the metal shell; the secondary metal ring of each phase is conductively connected through the same metal shell so that high currents are generated from interphase and three-phase short-circuits; the two high currents heat the metal shell rapidly; and the metal shell is at zero potential for safety and reliability as well. <IMAGE>
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