Drag cup for plasma arc torch

B - Operations – Transporting – 23 – K

Patent

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Details

B23K 10/00 (2006.01) H05H 1/34 (2006.01)

Patent

CA 2230520

A drag cup for a plasma arc torch is mounted on a sleeve member of the torch tip having a conical outer surface portion converging toward the torch nozzle and electrode assembly. The drag cup includes a mounting end, a conical portion extending along the conical portion of the sleeve member, and an end radially spaced from and surrounding the torch nozzle and including an end wall spaced axially outwardly of the end of the nozzle and having an opening therethrough coaxial with the plasma jet outlet orifice in the nozzle. The opening through the end wall of the drag cup is 3 to 6 times the size of the nozzle orifice and is large enough to provide a shielding gas flow about the plasma jet without disturbing the jet and, at the same time is small enough to protect the nozzle against molten metal blow-back through the opening.

Embout traînant de torche à plasma monté sur un élément de raccord du bec de la torche. Une partie de sa surface extérieure conique converge vers la buse de la torche et l'électrode. L'embout traînant comprend une extrémité de montage, une partie conique qui s'étend sur la partie conique de l'élément de raccord, et une extrémité espacée radialement de la buse de la torche qui entoure cette dernière, qui inclut une paroi d'extrémité espacée axialement vers l'extérieur de l'extrémité de la buse et qui comporte une ouverture coaxiale avec l'orifice pour le jet de plasma dans la buse. L'orifice dans la paroi d'extrémité de l'embout traînant est de 3 à 6 fois plus grand que l'orifice de la buse et il est suffisamment important pour permettre l'écoulement d'un gaz de protection près du jet de plasma sans nuire au jet, tout en étant, en même temps, assez petit pour protéger la buse contre le retour de métal liquide par l'ouverture.

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