Patent ID: 9226378
Filing Date: 2015-12-29
Classification: H05H

Abstract:
1. A plasma torch of a cascade-type comprising a cathode, an anode, a cascade between the cathode and the anode, and a pilot member between the cathode and the cascade, the plasma torch generating a plasma jet by applying an electric voltage between the cathode and the anode, wherein: the cathode comprises a copper main body part comprising a channel structure including a water cooling structure, and a rod-shaped tungsten negative electrode inserted in the copper main body part; the pilot member is electrically insulated from the cathode and the anode, the pilot member comprising a channel structure including a water cooling structure; the cascade is between the pilot member and the anode; the cascade comprises either a single component having an interior shaped so as to expand in multiple steps towards a side of the anode, or a plurality of components being electrically insulated from each other, the cascade being electrically insulated from the cathode and the anode, wherein the cascade comprises a channel structure including a water cooling structure; the anode is a copper component comprising a channel structure including a water cooling structure; the plasma torch further comprises a forming nozzle being connected so as to be electrically insulated from the anode, an interior of the forming nozzle shaped so as to expand in multiple steps towards an opposite side of the anode, the forming nozzle comprising a channel structure including a water cooling structure; and the plasma torch further comprises a side shield module preventing a gas inflow from a surrounding environment by generating a coaxial, annular, and low-velocity gas shield jet, thereby preventing oxygen from entering the forming nozzle and the plasma jet ejected from the forming nozzle.