Hybrid shield device for a plasma arc torch
US7935909B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 2007 |
| Grant date | May 3, 2011 |
| Priority date | — |
| Expiry date | Jan 5, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0352
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Methods and devices for controlling the flow of gases through a plasma arc torch are provided. A flow of plasma gas is directed to a plasma chamber, a first flow of auxiliary gas is directed around a plasma stream that exits a tip in one of a swirling manner and a radial manner, and a second flow of auxiliary gas is directed around the first flow of auxiliary gas and the plasma stream in one of a coaxial manner, an angled manner, and a radial manner. The first flow of auxiliary gas functions to constrict and shape the plasma stream to improve cut quality and cut speed, and the second flow of auxiliary gas functions to protect the plasma arc torch during piercing and cutting and to cool components of the plasma arc torch such that thicker workpieces may be processed with a highly shaped plasma stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.