Heating apparatus for induction ladle and vacuum furnace

Details Heating apparatus for induction ladle and vacuum furnace Heating apparatus for induction ladle and vacuum furnace

F - Mech Eng,Light,Heat,Weapons

27

D

F27D 11/06 (2006.01) B22D 41/015 (2006.01) H05B 6/02 (2006.01) H05B 6/24 (2006.01) H05B 6/36 (2006.01)

Patent

CA 2105246

An induction heating furnace (10) is disclosed comprising an induction coil assembly (16) and a ladle (12) having a metallic shell (14) that supports a crucible holding metal to be heated by the furnace. The ladle (12) is readily separated from the induction coil assembly (10) so that the heated metal may be conveniently and reliably moved among operational stations. The induction coil assembly (10) has a preselected length which is less than the length of the shell (14). The induction coil assembly (10) surrounds, but does not touch the shell (14) and generates an electromagnetic induction field. The induction coil assembly (10) comprises a coil (20), upper and lower yokes (28 and 34) and an intermediate yoke (40) coextensive with the coil (20). The upper and lower yokes (28 and 34) are separated from each other and electromagnetically coupled together by the intermediate yoke (40). The upper, lower and intermediate yokes (28, 34 and 40) each comprise stacked laminates (72 and 74) formed of sheets of ferrous material.

Cette invention concerne un four à induction (10) comprenant un bloc d'induction (16) et une poche de coulée (12) à coquille métallique (14) supportant un creuset destiné à contenir le métal à chauffer. La poche de coulée (12) se sépare aisément du bloc d'induction (10) pour permettre le transfert commode et sans risque du métal chauffé entre postes de travail. Le bloc d'induction (10) présente une longueur prédéterminée inférieure à celle de la coquille (14). Il entoure ladite coquille (14) sans la toucher et produit un champ électromagnétique par induction. Il comprend une bobine (20), un collier supérieur (28), un collier inférieur (34) et un collier intermédiaire (40) faisant toute la hauteur de la bobine (20). Les colliers supérieur et inférieur (28, 34) sont séparés l'un de l'autre mais couplés électromagnétiquement par le collier intermédiaire (40). Les trois colliers (28, 34 et 40) sont tous des stratifiés (72 et 74)formés de tôles en métal ferreux.

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