| 摘要 |
PROBLEM TO BE SOLVED: To provide a resistance heater and an electric resistance furnace using it with a high heat-resistant temperature like a zirconia-based heating element for an electric resistance furnace, strong against thermal deformation, and with a minimum damage upon a preheating element disposed around the resistance-heater. SOLUTION: The furnace has a pair of terminal portions 3a, 3b integrally formed on an outer periphery face of a cylindrical heating portion 2, and the terminal parts are coupled with thermal shields 4a1 to 4b2 for shielding radiant heat from the heating portion 2 with a clearance to the outer periphery face, the shields 4a1 to 4b2 with different polarities facing each other with insulating spaces 6a, 6b. The shields exist at portions except both ends of a linear line coupling the ends of outer periphery faces of the shields facing the spaces with the ends of the same and opposite polarity sides of inner periphery faces of the shields facing the spaces. The resistance heater having shields opposing on a linear line coupling the ends of the outer and inner periphery faces with the ends of the inner periphery faces of the shields facing at least either of the spaces is disposed at the center with the preheating element around it. COPYRIGHT: (C)2004,JPO
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