Title:
【発明の名称】プラズマアークトーチのための改良ノズル及び改良運転方法
Document Type and Number:
Japanese Patent JP3157164
Kind Code:
B2
Abstract:
In a plasma arc cutting torch a flow of plasma gas is bypassed out of a plasma chamber, preferably at an annular gap between a pre-orifice in an inner nozzle piece and an exit nozzle orifice in an outer nozzle piece. A bypass channel formed between the inner and outer nozzle pieces directs the bypass flow to atmosphere. A metering valve or restricting orifice remote from the gap controls the amount of the bypass flow and delays the response of changes in the flow parameters in the plasma chamber to changes in the bypass flow. The pre-orifice and nozzle orifice are positioned and dimensioned to optimize the mass flow velocity and the strength of a vortex-type flow at the pre-orifice, thereby creating a virtual nozzle immediately below the electrode. The gas flow in the plasma chamber is highly uniform and very steady.
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Inventors:
Couch, Richard W.
Thunders, Nicholas A.
Luau, rephen
Soble, john
Bukkander, Patrick
Thunders, Nicholas A.
Luau, rephen
Soble, john
Bukkander, Patrick
Application Number:
JP51239693A
Publication Date:
April 16, 2001
Filing Date:
May 08, 1992
Export Citation:
Assignee:
Hypertherm Incorporated
International Classes:
B23K10/00; H05H1/34; (IPC1-7): B23K10/00; H05H1/34
Domestic Patent References:
| JP4367377A | ||||
| JP6340299A | ||||
| JP4879593A | ||||
| JP60223668A | ||||
| JP63180378A | ||||
| JP3920307B1 |
Attorney, Agent or Firm:
Motohiro Kurauchi (1 outside)