Nozzle for a liquid-cooled plasma torch, nozzle cap for a liquid-cooled plasma torch and plasma torch head with the same

摘要

A nozzle (4) for a liquid cooled plasma torch comprising a nozzle bore (4.10) for exit of a jet of plasma at a nozzle tip (4.11), a first portion (4.1) whose outer surface (4.4) is substantially cylindrical and adjoins the nozzle tip (4.11) subsequent second section (4.2) whose outer surface (4.5) tapers towards the nozzle tip (4.11) substantially conically, wherein at least one Flüssigkeitszulaufnut (4.20; 4.21) is provided and over a portion of the first section (4.1) and extending over the second section (4.2) in the outer surface (4.5) of the nozzle (4) towards the nozzle tip (4.11), precisely one liquid return groove (4.22) separate from the liquid inlet groove (s) (4.20; 4.21) is provided, and extends over the second section (4.2) and in the first section (4.1) of the nozzle (4) has a further groove (4.6), which communicates with the Flüssigkeitszulaufnut (4.20) in connection and extending in the circumferential direction of the first section (4.1) of the nozzle (4) over the entire circumference or over an angle in the range of 60 ° to 300 °, in particular in the range of 90 ° to 270 °.