High temperature furnace heater

Details High temperature furnace heater High temperature furnace heater

1975-10-14

1976-10-05

Envall, Jr., R. N.

Electric heating

Microwave heating

Tunnel furnace

219406, 219532, 219542, 219552, 338280, 338283, 338282, H05B 306, F27D 1102

Patent

active

039846164

ABSTRACT:
A high temperature unitary electrical resistance heater which is mechanically supported throughout its active length but spaced from a refractory base with the heating element being substantially free of the supporting structure to provide an efficient heater having relatively low thermal inertia while being rigidly supported for high temperature operation. A flat continuous electrical resistor ribbon is folded in a multiple loop helix-like configuration formed of a plurality of straight segments and a repetitive array of folded, overlapped corner portions. A strut is interposed within each folded corner and welded therein, outwardly extending end portions of each strut being rigidly secured in a refractory base structure with the resistor ribbon being spaced along its active length from the base structure.

REFERENCES:
patent: 1928142 (1933-09-01), Trent et al.
patent: 2424780 (1947-07-01), Trent
patent: 2856496 (1958-10-01), Fisher
patent: 3118042 (1964-01-01), Parker

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