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US 4,416,623 AGranted
Muffle furnace
AssigneeKanto Yakin Kogyo K.K.
InventorSusumu Takahashi
Life of this patent
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Abstract
Muffle furnace having an elongated metallic muffle extending through several heating zones of the furnace. Temperature of muffle is measured at different parts thereof. In order to minimize the difference of temperature which causes the deformation of muffle, heaters of furnace are controlled coincidentally so as to compensate said difference.
Claims4
In a muffle furnace in which a plurality of successive heating zones are provided along the length of an elongate, metallic muffle which extends longitudinally through said heating zones, the improvement comprising
- a pair of spaced, independently operable heaters provided in each of said heating zones adjacent the upper and lower sides, respectively, of said muffle,
- a pair of temperature sensors mounted on said upper and lower sides, respectively, of said muffle in each of said zones,
- means for operating one of said heaters in each of said zones until a predetermined temperature is detected by one of the corresponding pair of sensors in the associated zone, and
- means for controlling the operation of the other of said heaters in each zone to minimize the difference in temperatures detected by the corresponding pair of sensors in the associated zone.
1 more element
Dependencies are inferred from the claim text.