| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable a plasma torch to use a large current by increasing the cooling capacity of an indirect water cooling system nozzle tip. <P>SOLUTION: The plasma torch provided with a nozzle tip 14 having an electrode rod 11, double cylindrical nozzle rests 5, 6 arranged with the electrode rod in a central position, and a nozzle 15 facing the pointed end of the electrode rod and a cooling medium flow passage for making a cooling medium flow in the front end side of the nozzle rest is provided with the nozzle tip 14 having a tapered male screw in an outer peripheral surface and tightened and coupled to the nozzle rest by the tapered male screw of the outer peripheral surface screwed into the female screw at the front end of the nozzle rest. There is a silver plating on the screw surface of at least either of the tapered male screw of the nozzle tip and the female screw at the front end of the nozzle rest. An inner tube 5 of the nozzle rest has a projected rim which bisects the circular cylindrical space for flowing of the cooling medium up to an annular space w2 of a nozzle tip coupling section of cooling medium flow passages 19-w1 to w4-20 to a lateral supply channel w1 and a drainage canal w3. <P>COPYRIGHT: (C)2008,JPO&INPIT |
