CA2127887A1 - Nozzle for providing a uniform gas flow in a plasma arc torch - Google Patents

Nozzle for providing a uniform gas flow in a plasma arc torch

Info

Publication number
CA2127887A1
CA2127887A1 CA 2127887 CA2127887A CA2127887A1 CA 2127887 A1 CA2127887 A1 CA 2127887A1 CA 2127887 CA2127887 CA 2127887 CA 2127887 A CA2127887 A CA 2127887A CA 2127887 A1 CA2127887 A1 CA 2127887A1
Authority
CA
Canada
Prior art keywords
nozzle
orifice
flow
plasma
plasma chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2127887
Other languages
French (fr)
Other versions
CA2127887C (en
Inventor
Richard W. Couch, Jr.
Nicholas A. Sanders
Lifeng Luo
John Sobr
Patrik Backander
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hypertherm Inc
Original Assignee
Richard W. Couch, Jr.
Nicholas A. Sanders
Lifeng Luo
John Sobr
Patrik Backander
Hypertherm, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Richard W. Couch, Jr., Nicholas A. Sanders, Lifeng Luo, John Sobr, Patrik Backander, Hypertherm, Inc. filed Critical Richard W. Couch, Jr.
Publication of CA2127887A1 publication Critical patent/CA2127887A1/en
Application granted granted Critical
Publication of CA2127887C publication Critical patent/CA2127887C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3421—Transferred arc or pilot arc mode
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3442—Cathodes with inserted tip
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3457—Nozzle protection devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3468—Vortex generators
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3436—Hollow cathodes with internal coolant flow

Abstract

In a plasma arc cutting torch (10), a flow of plasma gas is bypassed out of a plasma chamber (14) preferably at an annular gap between a pre-orifice in an inner nozzle piece (36) and an exit nozzle orifice in an outer nozzle piece (38). A bypass channel (20) formed between the inner and outer nozzle pieces directs the bypass flow to atmosphere. A metering valve (22) 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 (14) 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 (30). The gas flow in the plasma chamber (14) is highly uniform and very steady.
CA002127887A 1992-01-14 1992-05-08 Nozzle for providing a uniform gas flow in a plasma arc torch Expired - Lifetime CA2127887C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US820,278 1992-01-14
US07/820,278 US5317126A (en) 1992-01-14 1992-01-14 Nozzle and method of operation for a plasma arc torch

Publications (2)

Publication Number Publication Date
CA2127887A1 true CA2127887A1 (en) 1993-07-22
CA2127887C CA2127887C (en) 1998-07-14

Family

ID=25230371

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002127887A Expired - Lifetime CA2127887C (en) 1992-01-14 1992-05-08 Nozzle for providing a uniform gas flow in a plasma arc torch

Country Status (7)

Country Link
US (1) US5317126A (en)
EP (1) EP0621815B1 (en)
JP (1) JP3157164B2 (en)
AU (1) AU660032B2 (en)
CA (1) CA2127887C (en)
DE (1) DE69223805T2 (en)
WO (1) WO1993013905A1 (en)

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Also Published As

Publication number Publication date
AU660032B2 (en) 1995-06-08
WO1993013905A1 (en) 1993-07-22
DE69223805T2 (en) 1998-04-23
EP0621815B1 (en) 1997-12-29
US5317126A (en) 1994-05-31
EP0621815A4 (en) 1994-11-09
JP3157164B2 (en) 2001-04-16
AU1995892A (en) 1993-08-03
CA2127887C (en) 1998-07-14
DE69223805D1 (en) 1998-02-05
EP0621815A1 (en) 1994-11-02
JPH07506052A (en) 1995-07-06

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