| 摘要 |
PURPOSE:To fix a heating element firmly, to prevent deformation such as the sag of the heating element on heat generation and to keep a heat-generating temperature constant by gripping the heating element by a furnace casing and a holding piece and mounting the heating element by a bolt penetrating the furnace casing and the holding piece. CONSTITUTION:A heat-generating strand 4 as a heating element is arranged on the inner wall surface of a furnace casing 2, and a holding piece 8 with recessed sections 6 at positions such as two positions is brought into contact with the strand 4. That is, the heat-generating strand 4 is gripped by the furnace casing 2 and the holding piece 8. Fixing bolts 18 are penetrated to through-holes 12, 14, 16, and washers 22 and heat-insulating rings 24 are fitted while nuts 25 are set up to screw sections for the fixing bolts 18. Since a thick shape in approximately 6.5mm can be used as the heat-generating strand 4, the strand can be fastened tightly into the furnace casings 2A, 2B positively by a fixing means, and deformation by a furnace temperature can be prevented. Accordingly, temperature distribution can be maintained uniformly while the stable state of heating can be held, and the life of heating can be lengthened.
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