High temperature electric furnace with metallic resistances in the form of hollow vertical heating tubes
First Claim
1. A high temperature electric furnace having electric resistances therein which are vertical hollow heating tubes, electrically conductive bridge plates interconnecting the upper ends of each adjacent pair of tubes, electrically conductive bridge plates interconnecting the lower ends of each adjacent pair of tubes so as to complete a sinuous electrical path along the tubes, and hangers secured to the upper bridge plates and suspending the tubes within the furnace, each of said bridge plates being an obtuse angled dihedral whose obtuse angle opens toward the tubes to which it is connected.
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Abstract
A high temperature electric furnace has along its side walls vertical hollow electric resistance heating tubes (57) interconnected in serpentine fashion by conductive bridge plates (55). The tube ends and bridge plates are so contoured as to provide substantially uniform resistance along all possible current paths, thereby to avoid preferential current conduction with localized overheating. The bridge plates (55) and/or the tube ends are supported by air-cooled hollow hangers (28,45).
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Citations
10 Claims
- 1. A high temperature electric furnace having electric resistances therein which are vertical hollow heating tubes, electrically conductive bridge plates interconnecting the upper ends of each adjacent pair of tubes, electrically conductive bridge plates interconnecting the lower ends of each adjacent pair of tubes so as to complete a sinuous electrical path along the tubes, and hangers secured to the upper bridge plates and suspending the tubes within the furnace, each of said bridge plates being an obtuse angled dihedral whose obtuse angle opens toward the tubes to which it is connected.
- 5. A high temperature electric furnace having electric resistances therein which are vertical hollow heating tubes, electrically conductive bridge plates interconnecting the upper ends of each adjacent pair of tubes, electrically conductive bridge plates interconnecting the lower ends of each adjacent pair of tubes so as to complete a sinuous electrical path along the tubes, hangers secured to the upper bridge plates and suspending the tubes within the furnace, said hangers being hollow, and means to force a cooling fluid through said hollow hangers.
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10. A high temperature electric furnace having a roof and electric resistances within the furnace which are vertical hollow heating tubes, electrically conductive bridge plates interconnecting the upper ends of each adjacent pair of tubes, electrically conductive bridge plates interconnecting the lower ends of each adjacent pair of tubes so as to complete a sinuous electrical path along the tubes, and hangers secured to the upper bridge plates and suspending the tubes within the furnace, said hangers extending through said roof and suspending the tubes from the roof and constituting the sole support of the tubes within the furnace.
Specification