Plasma torch with a microwave transmitter

Details Plasma torch with a microwave transmitter Plasma torch with a microwave transmitter

H - Electricity

05

H

H05H 1/30 (2006.01) H05H 1/46 (2006.01)

Patent

CA 2327093

The invention relates to a plasma torch with a microwave transmitter which, for example, is used to coat surfaces and to produce radicals. The inventive plasma torch is characterized by exhibiting a minimal energy loss during the transmission of microwaves to the produced plasma flame. The plasma torch comprises a waveguide for the transmitted microwaves and has a coaxial conductor. An electrode provided with a duct, and a nozzle provided on the end of the duct, said end facing away from the waveguide, are arranged in said coaxial conductor in an essentially axial manner. The plasma flame is produced at the nozzle. A coupling element is arranged between the waveguide and the coaxial conductor. The electrode is connected to the coupling element via a mounting plate and an electrically insulating intermediate element in a gas- tight, thermally insulated manner such that microwaves are permitted to pass through.

L'invention concerne un chalumeau à plasma comportant un émetteur hyperfréquence, servant par exemple à revêtir des surfaces et à produire des radicaux. Ce chalumeau à plasma se distingue par des pertes d'énergie minimales lors de la transmission des hyperfréquences à la flamme de plasma produite. Il présente un guide d'ondes pour les hyperfréquences émises et un conducteur coaxial dans lequel sont disposés de manière sensiblement axiale une électrode pourvue d'un passage et un ajutage prévu à l'extrémité du passage opposée au guide d'ondes, la flamme de plasma étant produite au niveau de l'ajutage. Un élément de couplage est placé entre le guide d'ondes et le conducteur coaxial. L'électrode est raccordée de manière étanche aux gaz, isolée thermiquement et perméable aux hyperfréquences, à l'élément de couplage par l'intermédiaire d'un disque de logement et d'un élément intermédiaire électro-isolant.

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