HOLLOW TYPE PLASMA TORCH APPLIED WITH MULTI-POLE MAGNETIC FIELD FOR CONTROLLING ARC COLUMN OSCILLATION

摘要

The present invention relates to a hollow type plasma torch which generates thermal plasma jet by arc discharge, and more specifically, to a hollow type plasma torch which can control a position of an arc column in a torch by using a multi-pole magnetic field. The hollow type plasma torch, according to the present invention, comprises: a first electrode having a first discharge space which is extended in one direction therein; a second electrode which is placed apart from the first electrode in a longitudinal direction, and has a second discharge space, connected to the first discharge space in a longitudinal direction, therein; and a magnetic field forming unit which is placed away from an outer surface of the first electrode or the second electrode, and forms a magnetic field by multi-pole, which is at least four poles, to apply the magnetic field to the first discharge space or the second discharge space. According to embodiments of the present invention, the multi-pole magnetic field is used to apply the magnetic field in a radial direction, as well as the magnetic field in an axial direction, so the shape and movement thereof across the entire area of the arc column can be electromagnetically controlled. Accordingly, the plasma jet can be stabilized.;COPYRIGHT KIPO 2017