US 11,997,779 B2Granted

Liquid cooled plasma arc torch

AssigneeLincoln Global, Inc.

InventorsPraveen K. Namburu, Wayne S. Severance, Jr., Matthew E. Train

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Abstract

A plasma arc torch includes a cathode extending along an axis of the torch, a pilot arc conductor, and a nozzle body. A first fluid conduit and second fluid conduit extend parallel to the axis of the torch. A first offset fitting includes a first duct coupled to and in fluid communication with the first fluid conduit, and a second duct in fluid communication with the first duct and outwardly radially offset from the first duct and extending away from the first duct in a proximal direction. A second offset fitting includes a third duct coupled to and in fluid communication with the second fluid conduit, and a fourth duct in fluid communication with the third duct and outwardly radially offset from the third duct and extending away from the third duct in the proximal direction. A spring compression plug electrically connects the pilot arc conductor to the nozzle body.

Claims14

Dependent claims

A plasma arc torch, comprising:

a cathode extending along an axis of the torch in a distal direction toward an electrode attached to the cathode, and having a first plurality of cooling liquid apertures;
a nozzle;
a nozzle body having an internal cooling liquid channel that conveys cooling liquid toward the nozzle, wherein the nozzle body is an anode of the plasma arc torch;
an inner isolator having a second plurality of cooling liquid apertures in fluid communication with the first plurality of cooling liquid apertures;
an outer isolator radially offset from the inner isolator to form an interstitial space through which the cooling liquid is conveyed into nozzle body, wherein a distal terminal end of the outer isolator is radially offset from the inner isolator such that the interstitial space extends to the distal terminal end of the outer isolator and the inner isolator extends distal of the outer isolator and the outer isolator extends proximal of the inner isolator, and wherein the inner isolator and the outer isolator electrically insulate the nozzle body from the cathode;
a cooling liquid return conduit;
and
a cooling liquid return offset fitting including a first cooling liquid return duct in fluid communication with the cooling liquid return conduit, and a second cooling liquid return duct in fluid communication with the first cooling liquid return duct, wherein the first cooling liquid return duct is coupled to the cooling liquid return conduit, and the second cooling liquid return duct is outwardly radially offset from the first cooling liquid return duct and extends away from the first cooling liquid return duct in a proximal direction, parallel to the axis of the torch.

5 more elements

A plasma arc torch, comprising:

a cathode extending along an axis of the torch in a distal direction toward an electrode attached to the cathode;
a pilot arc conductor;
a nozzle body that is an anode of the plasma arc torch;
a plasma gas conduit;
a shield gas conduit;
a cooling liquid return conduit;
a plasma gas offset fitting including a first plasma gas duct in fluid communication with the plasma gas conduit, and a second plasma gas duct in fluid communication with the first plasma gas duct, wherein the second plasma gas duct is outwardly radially offset from the first plasma gas duct and extends away from the first plasma gas duct in a proximal direction away from the electrode, parallel to the axis of the torch;
a shield gas offset fitting including a first shield gas duct in fluid communication with the shield gas conduit, and a second shield gas duct in fluid communication with the first shield gas duct, wherein the second shield gas duct is outwardly radially offset from the first shield gas duct and extends away from the first shield gas duct in the proximal direction, parallel to the axis of the torch;
a cooling liquid return offset fitting including a first cooling liquid return duct in fluid communication with the cooling liquid return conduit, and a second cooling liquid return duct in fluid communication with the first cooling liquid return duct, wherein the second cooling liquid return duct is outwardly radially offset from the first cooling liquid return duct and extends away from the first cooling liquid return duct in the proximal direction, parallel to the axis of the torch;
and
a spring compression plug electrically connecting the pilot arc conductor to the nozzle body.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/060,203Filed 1 Oct 2020 · us provisional application
Priority: 8 Nov 2019
Published: US 2021/0144837 A113 May 2021
Granted: 28 May 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

H05H 1/34
Using an arc: details, e.g. electrodes, nozzles
B23K 10/006
Welding or cutting by means of a plasma: control circuits therefor
B23K 26/1435
Using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor: involving specially adapted flow-control means
B23K 31/10
Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups…:…