Electric heating – Metal heating – By arc
Patent
1974-09-03
1976-04-27
Grimley, Arthur T.
Electric heating
Metal heating
By arc
219383, B23K 500
Patent
active
039537056
ABSTRACT:
An arc gas heater includes an injector unit having a chamber into which high pressure gas is introduced in a swirl and a constrictor passage leading from the chamber so that the swirling gas flows downstream through the constrictor passage. A rear tubular electrode opens into the chamber with its hollow interior axially aligned with the constrictor passage. The injector unit is separated from a tubular front electrode by interelectrode segments having axially aligned tubular inserts which define a continuation of the constrictor passage beyond the injector unit. Located downstream from the front electrode is a convergent-divergent nozzle. Air flowing subsonically through the constrictor passage assumes a relatively high constant pressure therein, and this high pressure demands a greater difference in electrical potential between the two electrodes to maintain an arc in the passage. This arc elevates the energy of the gas in the constrictor passage to extremely high values. The interelectrode segments are separated by dielectric discs. Adjacent ends of the tubular inserts overlap, yet are separated by air spaces through which secondary air is introduced tangentially to prevent arc-over between segments and to maintain the swirl through the constrictor passage. The swirling air envelopes the arc and confines it to the center of the constrictor passage. The overlap of the insert ends further shields the dielectric discs from arc radiation in the constrictor passage.
REFERENCES:
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patent: 3301995 (1967-01-01), Eschenbach et al.
patent: 3309550 (1967-03-01), Wolf et al.
patent: 3360988 (1968-01-01), Stine et al.
patent: 3368397 (1968-02-01), Wochna
patent: 3403277 (1968-09-01), Way et al.
patent: 3533756 (1970-10-01), Houseman
patent: 3585434 (1971-06-01), Kato et al.
patent: 3663792 (1972-05-01), Fey
patent: 3832519 (1974-08-01), Wolf et al.
Grimley Arthur T.
McDonnell Douglas Corporation
Peterson G. R.
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