High-frequency heating apparatus with wave guide switching means

Details High-frequency heating apparatus with wave guide switching means High-frequency heating apparatus with wave guide switching means

1993-01-22

1995-09-19

Leung, Philip H.

Electric heating

Microwave heating

Field modification

219754, 219687, 219717, H05B 672, H05B 678

Patent

active

054517516

ABSTRACT:
A high-frequency heating apparatus capable of heating uniformly a liquid load, having an economical wave guide switching unit and having a compact-sized and economical power circuit to drive a plurality of magnetrons. The high-frequency heating apparatus includes an excitation opening, provided at the bottom of a heating chamber for radiating microwaves to heat the liquid load in a container, a magnetron for generating the microwave to heat the object and a wave guide connected to a magnetron. The apparatus further includes a wave guide switching unity for switching the propagation of the microwave to one of plural wave guides. The switching unit includes a pair of circular conductive plates and a conductor disposed in the vicinity of a circumference of the circular conductive plate so as to shut off the microwave, wherein there is constructed a choke structure on the wave guide containing the circular conductive plates. The apparatus further includes a magnetron drive circuit including a filament heating power supply connected to each filament of the magnetrons, a high voltage generating element and a switching element for selectively supplying a high voltage from the high voltage generating element to an anode of the magnetrons.

REFERENCES:
patent: 2909635 (1959-10-01), Haagensen
patent: 3810248 (1974-05-01), Risman et al.
patent: 4458126 (1984-07-01), Dills et al.
patent: 4499356 (1985-02-01), Hatagawa
patent: 4501944 (1985-02-01), Matsushima
patent: 4591682 (1986-05-01), Takeuji
patent: 4800246 (1989-01-01), Lee et al.
patent: 4939331 (1990-07-01), Berggren et al.
patent: 5034587 (1991-07-01), Takagi
patent: 5155317 (1992-10-01), Lee

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