HIGHLY-DURABLE ARC GENERATOR OF LOW-TEMPERATURE PLASMA PROTECTIVE NANOSTRUCTURED CARBONACEOUS COATING OF ELECTRODES Russian patent published in 2015 - IPC H05H1/24 H05B7/18 B82B3/00 

FIELD: electricity.

SUBSTANCE: plasma gun contains an outer electrode, an inner electrode holding the cathode and placed coaxially, a vortex chamber feeding plasma-generating gas. The electrodes are insulated and placed in induction coils. The inner electrode holding the cathode is made hollow. Methane hydrocarbons are fed to curved channel of the outer electrode through outlet channels and circular cavity. To near-cathode area methane hydrocarbons are fed through a tube placed at the axis of the inner electrode holding the cathode and cavity formed by location of the cathode in the hollow electrode holding the cathode. The plasma gun has at least four channels for hydrocarbon gas delivery to the near-cathode area of arc discharge. The channels are placed evenly in circumferential direction. Total area of the channels open flow area provides gas velocity of about 0.3-0.5 of sound speed at the preset complete pressure and temperature of the feed gas. Delivery of hydrocarbon gas to the near-cathode area of arc discharge is designed in three versions.

EFFECT: improved resource of the electrode operation due to sustainable renewal of the protective nanostructured carbonaceous layer.

4 cl, 5 dwg