Electric heating – Metal heating – By arc
Patent
1982-07-02
1984-02-14
Envall, Jr., Roy N.
Electric heating
Metal heating
By arc
219121PN, 219 1057, 219 1065, 219 1049R, B23K 500
Patent
active
044319010
ABSTRACT:
An induction plasma tube having a segmented, fluid-cooled internal radiation shield is disclosed. The individual segments are thick in cross-section such that the shield occupies a substantial fraction of the internal volume of the plasma enclosure, resulting in improved performance and higher sustainable plasma temperatures. The individual segments of the shield are preferably cooled by means of a counterflow fluid cooling system wherein each segment includes a central bore and a fluid supply tube extending into the bore. The counterflow cooling system results in improved cooling of the individual segments and also permits use of relatively larger shield segments which permit improved electromagnetic coupling between the induction coil and a plasma located inside the shield. Four embodiments of the invention, each having particular advantages, are disclosed.
REFERENCES:
patent: 3641308 (1972-02-01), Couch, Jr. et al.
patent: 3944778 (1976-03-01), Bykhovsky et al.
patent: 4247736 (1981-01-01), Grigorier et al.
"Induction Plasma Heating: System Performance, Hydrogen Operation and Gas Core Reactor Simulator Development," Thorpe, M. L.; NASA CR-1143 Aug. 1968.
"Induction Plasma Heater with High Velocity Sheath", TAFA Bulletin 26-D8; Jul. 1968.
"Induction-Coupled Plasma as a Chemical Reactor", Clump, C. L.; Huska, P. A.; Lehigh University; H-F Heating Review.
"Induction-Coupled Plasma Torch"; Reed, T. B.; MIT; High Frequency Heating Review, New York, N.Y.
Eklund William A.
Envall Jr. Roy N.
Gaetjens Paul D.
Lateef M. M.
The United States of America as represented by the United States
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