Nozzle assembly for plasma spray gun.

摘要

A nozzle assembly for a plasma gun is disclosed, containing an annular coolant passage for extended nozzle life, providing for convenient and low cost replacement of the nozzle member and for improved gun operation. To form the assembly a jacket is disposed about the nozzle member in a predetermined coaxial position. An inner surface of the jacket cooperates with the cylindrical exteriority of the nozzle to define an annular coolant passage. The jacket and the nozzle are in relative slidable relationship such that the jacket is removable and replaceable forwardly with respect to the nozzle member, forwardly being in respect to the direction of the plasma flame. Threading means and pilot surfaces engaged between the nozzle member and the jacket at the rearward end of the nozzle assembly cooperate to retain the jacket in its predetermined position relative to the nozzle member. The jacket has coolant ports for the coolant connecting with the annular passage. A seal such as an O-ring is interposed between the forward portion of the nozzle and the jacket. A rear O-ring seal is set in a groove formed cooperatively between a rear annular surface of the jacket and a rim on the nozzle member.