Electric heating – Metal heating – Of cylinders
Patent
1978-12-13
1981-03-03
Grimley, Arthur T.
Electric heating
Metal heating
Of cylinders
174 35GC, 219 1055F, H05B 676
Patent
active
042543185
ABSTRACT:
A door seal arrangement for application to a high-frequency heating apparatus comprising a heating chamber having an access opening and an oven door for openably closing the access opening, for preventing leakage of electromagnetic wave energy through the peripheral area of the oven door. In this door seal arrangement, a plurality of reactance elements of a conductive metal material or a dielectric material having a high dielectric constant are disposed between the flat surfaces of the parallel plate transmission line constituted by the oven door and the heating chamber to extend along the access opening of the heating chamber thereby forming a series resonance circuit connected in parallel with the parallel plate transmission line provided by the oven door and the heating chamber. This series resonance circuit provides a high-frequency electromagnetical short-circuit plane at the disposed location of the reactance elements so that the electromagnetic wave energy emerging from within the heating chamber to be incident at an arbitrary incident angle upon the parallel plate transmission line and tending to leak toward the exterior of the high-frequency heating apparatus can be reflected back toward the heating chamber.
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Van Koughnett, Dunn, J. G. Doubly Corrugated Chokes For Microwave Systems, Journal of Microwave Power 8(1) 1973, pp. 101-109.
Kikuchi Itsuo
Ohkawa Shuji
Grimley Arthur T.
Hitachi Heating Appliances Co., Ltd.
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