| 摘要 |
<p>A plasma torch appropriate for the use in cutting or welding metallic material, which prevents breakage of an insulating cylindrical body and consequent melting of the contact part between an electrode table and electrode, and permits easy removal of a swirler from a nozzle when disassembling the plasma torch. For this purpose, the contact surface (61) between the nozzle (6) and the swirler (5), that (4b) between the swirler (5) and the insulating cylindrical body (4), that (3a) between the insulating cylindrical body (4) and the electrode (3), and that (3a) between the electrode (3) and the electrode table (2) are arranged on a line running from the nozzle (6) to the torch proper (1). Regarding the insulating cylindrical body (4), the inner diameter (d1) on the surface in contact with the flange (31) of the electrode (3) is smaller than that (d2) on the surface in contact with the swirler (5). The inside of the cylindrical part (62) of the nozzle (6) is stepped or tapered for enlarging the diameter of the upper part thereof above the swirler except the whole or a part of the seat for the swirler (5).</p> |
