Patent ID: 7002097
Filing Date: 2006-02-21
Classification: H05H

Abstract:
1. A switching device for a mode transition of DC plasma torches, comprising: a movable electrode unit, comprising a movable electrode, a conductive linking rod and a top output end-plate; a fixed electrode unit, comprising a fixed electrode and a bottom output end-plate; an insulating board with an end surface connected with an end of said conductive linking rod; a driver connected to another end surface of said insulating board; and an insulated chamber formed with an insulated top fixed sealing plate, a double-layer insulating sleeve and an insulated bottom fixed sealing plate, and sealed up with an O-ring; wherein said insulated chamber is filled with a non-combustible liquid inside and said non-combustible liquid is cooled down by being transferred by a pump to a heat exchanger and then being transferred back into said insulated chamber through said insulating sleeve; wherein, when said movable electrode is in touch with said fixed electrode, a current from an end of a DC power supplier is entered into a rear electrode of a plasma torch; then passes through a nozzle electrode of said plasma torch; then, through said top output end-plate, is transferred to said bottom output end-plate; and, is transferred to another end of said DC power supplier to form a circuit to make said plasma torch run in a non-transmitting mode; and wherein said current is detected by a current sensor and is transferred back to said DC power supplier; when said current reaches a setup value of a current level controller, said current level controller outputs a control signal to move said driver to separate said movable electrode and said fixed electrode by said non-combustible liquid to make said plasma torch run in a transmitting mode.