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US 5,965,040 AGranted
Plasma arc torch
AssigneeLincoln Global, Inc.
InventorsLifeng Luo, William T. Matthews, David W. Perrin
Life of this patent
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AssigneeLincoln Global, Inc.
InventorsLifeng Luo, William T. Matthews, David W. Perrin
Estimating the term…
A plasma torch comprises a tubular nozzle having an end wall and an electrode in the nozzle having a nose end facing the end wall. The nose end and end wall provide a plasma gas chamber, and the end wall has a gas chamber outlet opening extending axially therethrough. The gas chamber has an entrance radially outwardly of the outlet opening and the end wall has a plurality of arcuate ribs thereon circumferentially spaced apart about said outlet opening and providing a plurality of arcuate gas directing channels for radially guiding the flow of plasma gas in a swirling flow pattern from the entrance to the outlet opening. The nozzle and nozzle mounting components provide an improved arrangement for cooling the torch tip and producing a gas shield about the plasma jet.
A plasma torch nozzle comprising a tubular body having an axis and axially opposite ends, an end wall at one of said ends, said body having a peripheral inner surface, said end wall having an axially inner side merging with said peripheral surface, a plasma gas outlet opening extending axially through said end wall, and rib means on said inner side of said end wall for radially guiding the flow of a plasma gas toward said outlet opening.
A plasma torch nozzle comprising a tubular body having an axis, an axially extending inner surface, axially opposite ends, and an end wall at one of said opposite ends, said end wall having an outlet opening extending axially therethrough, said nozzle having an outer side extending between said opposite ends and mounting flange means extending radially outwardly of said outer side intermediate said opposite ends, said flange means having axially opposite first and second sides respectively facing said one and the other of said opposite ends of said body, said outer side of said nozzle including coaxial, axially adjacent first cylindrical, conical and second cylindrical surface portions extending sequentially from said first side of said mounting flange means to said one of said opposite ends of said nozzle, said first and second cylindrical surface portions respectively having first and second diameters, said second diameter being greater than said first diameter, and said conical surface portion diverging from said first to said second surface portion.
Dependencies are inferred from the claim text.