Microwave system with at least two megnetrons and method for...

H - Electricity – 05 – B

Patent

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H05B 6/78 (2006.01) B22D 41/00 (2006.01) H05B 6/00 (2006.01) H05B 6/70 (2006.01) H05B 6/74 (2006.01) H05B 6/80 (2006.01)

Patent

CA 2397137

Disclosed is a heating system or microwave processing system for a material or an object, comprising an applicator or oven (5) which is fed by two separate magnetrons (11, 12). The magnetrons are mounted on the combined branches (3, 4) of a magic T-coupler or directional coupler, forming a ring. The other combined branches (1, 2) irradiate the material (10). Impedance adapters (8,9) are disposed in the branches (3,4) and/or in front of the magnetrons (11, 12) for decoupling the operation of the magnetrons and transmission of the full amount of power emitted by the magnetrons to the material or object. According to the method described, it is possible to obtain a constant, homogeneous, maximum distribution on the object or material, or inversely, a distribution which is modulated according to the material or object, i.e. a maximum amount of central distribution and less distribution on the surface, by adjusting the impedance adapters with the aid of dual balanced mixers, for example.

On décrit une installation de chauffage ou de traitement micro-onde d'un matériau ou d'objet comprenant un applicateur ou four (5) alimenté par deux magnétrons (11, 12) séparés. Les magnétrons sont montés sur les branches (3, 4) conjuguées d'un Té magique ou d'un coupleur directif, formant un anneau. Les autres branches (1, 2) conjuguées irradient le matériau (10). On dispose des adaptateurs d'impédance (8, 9) dans les branches (3,4) et/ou devant les magnétrons (11, 12) pour découpler le fonctionnement des magnétrons et transmettre toute la puissance émise par les magnétrons au matériau ou à l'objet. Un procédé est décrit qui permet par réglages des adaptateurs d'impédance, par exemple à l'aide de doubles mélangeurs équilibrés, d'obtenir une distribution constante, homogène et maximale sur le matériau ou l'objet, ou au contraire d'obtenir une distribution modulée sur le matériau ou l'objet, notamment maximale au centre et moindre en surface.

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