B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/34
B23K 9/00 (2006.01) H05H 1/28 (2006.01) H05H 1/32 (2006.01) H05H 1/38 (2006.01) H05H 1/34 (2006.01)
Patent
CA 1324189
Abstract of the Disclosure In a plasma arc torch, an electrode is movable axially into and out of electrical connection with an anode, typically a nozzle secured to one end of a torch body. A flow of pressurized plasma gas is directed to a plasma chamber between the electrode and the nozzle, preferably through a replaceable swirl ring that closely surrounds and guides the electrode at a larger diameter shoulder portion of the electrode. A gas flow passage, preferably a spiral passage machined on the outer side surface of the shoulder portion, diverts a portion of the gas flow from the plasma chamber to a region above the electrode where it is vented to atmosphere. The passage is sufficiently constricted that a substantial pressure drop appears along the path, while at the same time allowing a sufficient flow to produce the desired cooling. The revolutions of the spiral are preferably closely spaced to enhance the surface area of the electrode in a heat transfer relationship with the cooling gas flow.
605319
Couch Richard W. Jr.
Sanders Nicholas A.
Hypertherm Inc.
Riches Mckenzie & Herbert Llp
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