EP1933607A1 - Plasma-Schneidbrenner mit Kühlkreislauf und adaptativem Steigrohr - Google Patents

Plasma-Schneidbrenner mit Kühlkreislauf und adaptativem Steigrohr Download PDF

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Publication number
EP1933607A1
EP1933607A1 EP07301591A EP07301591A EP1933607A1 EP 1933607 A1 EP1933607 A1 EP 1933607A1 EP 07301591 A EP07301591 A EP 07301591A EP 07301591 A EP07301591 A EP 07301591A EP 1933607 A1 EP1933607 A1 EP 1933607A1
Authority
EP
European Patent Office
Prior art keywords
electrode
tube
torch
support means
dip tube
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.)
Withdrawn
Application number
EP07301591A
Other languages
English (en)
French (fr)
Inventor
Michael Desclides
Benoit Barthélemy
Frédéric Richard
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Lincoln Electric Co France SA
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Air Liquide Welding France
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 Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude, Air Liquide Welding France filed Critical Air Liquide SA
Publication of EP1933607A1 publication Critical patent/EP1933607A1/de
Withdrawn legal-status Critical Current

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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
    • H05H1/28—Cooling arrangements
    • 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
    • H05H1/3436—Hollow cathodes with internal coolant flow

Definitions

  • the present invention relates to a plasma cutting torch with cooling circuit comprising a dip tube permanently maintained in contact with the electrode bottom, regardless of the length of the electrode used.
  • the plunger tube makes it possible to ensure the circulation and the contact of the cooling fluid, for example distilled water, with the bottom of the electrode carrying the emitting insert so as to ensure the most efficient cooling. possible effective said electrode bottom and especially the emissive insert heated to very high temperature during use of the torch.
  • the cooling fluid for example distilled water
  • the emissive insert of the electrode that clings the plasma arc foot and it is therefore essential to cool it effectively to minimize and / or slow down its erosion due to the vaporization of the material. which constitutes it, such as hafnium, zirconium, tungsten or a metal alloy containing one or more of these metals.
  • a dip tube generally has a tubular shape, that is to say the shape of an elongated tube of cylindrical section, and comprises a downstream end opening at the electrode bottom, when the dip tube is positioned in a torch .
  • the plunger tube makes it possible to ensure the arrival of the cooling fluid in contact with the said bottom of the electrode in order to ensure a thermal exchange allowing the cooling of the insert, and then the return, that is to say the evacuation of the heated cooling fluid in contact with the electrode bottom.
  • the cooling fluid is typically conveyed inside the dip tube and towards the electrode bottom. Then, the evacuation of the heated fluid in contact with the electrode bottom is between the outer wall of the dip tube and in particular the inner wall of the electrode in which it is positioned within the torch body. This is the commonly used direction of circulation, but one could consider circulating the coolant in the other direction.
  • the size, that is to say the length, of the electrodes used in the various plasma cutting processes is variable because the structure of the electrodes varies depending on the cutting conditions, the intensity of the cutting, the process to be implemented ...
  • the document US-2004/200810 discloses a plasma cutting torch in which the dip tube has an end which is held at a substantially constant distance from the blind bottom of the electrode by means of support means which exert on it a force tending to keep it in contact with of the electrode bottom.
  • a problem to be solved is therefore to be able to change the electrode of a plasma torch, in particular during a process change or the conditions of a given process, without having to also replace the tube torch torch and such that the dip tube is kept at a distance approximately constant from the bottom of the electrode regardless of the electrode used.
  • a plasma cutting torch comprising a torch body with a nozzle, a hollow electrode having a blind bottom and an emitting insert, and an internal cooling circuit comprising a dip tube arranged, at least in part, in the hollow electrode, the dip tube having a downstream end which is maintained at a substantially constant distance from the blind bottom of the electrode by means of support means coming to exert on the plunger tube a force tending to push the dip tube towards the bottom of the electrode, characterized in that the support means come to exert an elastic force on the dip tube.
  • the invention also relates to an automatic plasma cutting machine comprising a torch according to the invention, as well as a method of plasma cutting a metal part, in particular a carbon steel part, stainless steel, aluminum or an aluminum alloy, in which is implemented a torch and / or a machine according to the invention.
  • the body 1 of the plasma torch of the invention comprises a nozzle 4, a hollow electrode 2 having a blind bottom 2a and carrying an emitting insert 3, and an internal cooling circuit comprising a dip tube 5 arranged, at least in part, in the hollow electrode 2.
  • plasma cutting torch is understood to mean a torch designed to concentrate the energy in the form of an arc plasma jet at a very high temperature, typically between 15000 and 20000.degree. vs.
  • the pressurized plasma jet melts the metal at its point of impact with the workpiece and ejects the molten metal out of the groove below the workpiece.
  • the plasma jet is generated by an electric arc that is established between the electrode 2 of the torch and the workpiece.
  • the arc combines, in the plasmagene chamber located between the nozzle 4 and the electrode 2 with an emitting insert 3, in hafnium, zirconium or tungsten, with a flow of gas called a "plasma gas" to ensure the generation of the plasma and well said.
  • the plasma jet is constricted by the outlet orifice 8 of the nozzle 4 of the torch, which gives it fineness and rigidity.
  • a cooling fluid for example distilled water
  • This cooling fluid is conveyed in the torch body 1 by fluid passages arranged in said body 1 and also by the plunger tube 5, which partially enters the blind-bottom electrode 2 to convey the cooling water therein to near the insert 3.
  • the plunger tube 5 has a downstream end 5a which is held at a substantially constant distance from the blind bottom 2a of the electrode 2 by means of support means 6 coming to exert on the plunger tube 5 a force elastic tending to push the tube 5 towards the bottom 2a.
  • the downstream end 5a of the plunger tube 5 enters the electrode 2 and is maintained at a substantially constant distance from the bottom 2a of the electrode 2 (cf. Figure 3 ) thanks to a permanent and, preferably, centered contact of the dip tube 5 on the inner surface of the electrode 2 by a device or elastic support means 6, such as a spring for example, preferably pressing axially on the dip tube 2, as shown in Figure 2 .
  • the resilient spring bearing means may in particular come to bear axially on a lateral shoulder 7 arranged on the outer wall of the plunger tube 5 so as to push the plunger tube 5 towards the electrode 2.
  • a spring 6 can bear axially on the peripheral rim of the upstream end 5b of the dip tube 5, or even inside thereof.
  • the resilient spring means 6 press on the upper part of the plunger tube 5, that is to say its upstream portion 5b carrying the downstream orifice of the plunger tube.
  • the upstream orifice corresponds to the inlet for the cooling fluid in the plunger tube 5, while the downstream orifice corresponds to the outlet orifice of the cooling fluid in the plunger tube 5.
  • the elastic axial force is thus applied by the support means 6 to the dip tube 5 in the direction of the electrode 2 so as to maintain the dip tube 5 at an approximately constant distance from the bottom of the electrode 2 regardless of the electrode used.
  • such a configuration makes it possible to change the electrode 2 of the plasma torch, in particular during a process change or a variation of the process conditions, without having to replace the dip tube 5 of the torch since the support means 6 elastically push the plunger tube 6 towards the electrode so as to obtain effective cooling of the insert 3 of the electrode 2 since the flow of the cooling water is always closer to the insert.
  • the plunger tube 5 comes into direct abutment with the bottom of the electrode by being pushed towards said bottom by the elastic bearing means, preferably a spring.
  • resilient support means such as a spring
  • the plasma torch is of the single-flow or double-flow type, that is to say that it can be equipped with a single nozzle 4 or else two coaxial nozzles so as to deliver two streams of gas, namely a flow of plasma gas from the inner nozzle 2 and a peripheral flow from the outer nozzle and for effecting a gas cladding of the plasma gas flow.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)
  • Arc Welding In General (AREA)
EP07301591A 2006-12-13 2007-11-27 Plasma-Schneidbrenner mit Kühlkreislauf und adaptativem Steigrohr Withdrawn EP1933607A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0655488A FR2910224A1 (fr) 2006-12-13 2006-12-13 Torche de coupage plasma avec circuit de refroidissement a tube plongeur adaptatif

Publications (1)

Publication Number Publication Date
EP1933607A1 true EP1933607A1 (de) 2008-06-18

Family

ID=38198467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07301591A Withdrawn EP1933607A1 (de) 2006-12-13 2007-11-27 Plasma-Schneidbrenner mit Kühlkreislauf und adaptativem Steigrohr

Country Status (2)

Country Link
EP (1) EP1933607A1 (de)
FR (1) FR2910224A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009059108A1 (de) * 2009-12-18 2011-06-22 Holma Ag Elektrode mit Kühlrohr für eine Plasmaschneidvorrichtung
EP2640167A1 (de) * 2012-03-15 2013-09-18 Manfred Hollberg Plasmaelektrode für eine Plasma-Schneidvorrichtung
US9095037B2 (en) 2010-02-04 2015-07-28 Holma Ag Nozzle for a liquid-cooled plasma cutting torch with grooves
US9114475B2 (en) 2012-03-15 2015-08-25 Holma Ag Plasma electrode for a plasma cutting device
WO2017180550A1 (en) * 2016-04-11 2017-10-19 Hypertherm, Inc. Arc cutting system, including coolant tubes and other consumables, and related operational methods
WO2021155874A1 (en) * 2020-02-05 2021-08-12 B&Bartoni, spol. s r.o. Electrode assembly for plasma arc torch with the improved electric current transfer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009058831A1 (de) * 2009-12-18 2011-07-14 Holma Ag Elektrode für einen Plasmabrenner

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4481636A (en) * 1982-05-05 1984-11-06 Council For Mineral Technology Electrode assemblies for thermal plasma generating devices
WO1990010366A1 (en) 1989-03-03 1990-09-07 Tetronics Research & Development Company Limited Plasma arc torch
US5278388A (en) * 1993-06-07 1994-01-11 Huang Huang Nan Plasma welding and cutting gun for discharging plasma gas with constant outlet pressure
US20010007320A1 (en) 1998-03-06 2001-07-12 The Esab Group, Inc. Plasma arc torch
JP2003136247A (ja) * 2001-10-25 2003-05-14 Kohtaki Seiki Kk プラズマ自動切断機での型切断方法
US20040200810A1 (en) 2003-04-11 2004-10-14 Hypertherm, Inc. Method and apparatus for alignment of components of a plasma arc torch

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4481636A (en) * 1982-05-05 1984-11-06 Council For Mineral Technology Electrode assemblies for thermal plasma generating devices
WO1990010366A1 (en) 1989-03-03 1990-09-07 Tetronics Research & Development Company Limited Plasma arc torch
US5278388A (en) * 1993-06-07 1994-01-11 Huang Huang Nan Plasma welding and cutting gun for discharging plasma gas with constant outlet pressure
US20010007320A1 (en) 1998-03-06 2001-07-12 The Esab Group, Inc. Plasma arc torch
JP2003136247A (ja) * 2001-10-25 2003-05-14 Kohtaki Seiki Kk プラズマ自動切断機での型切断方法
US20040200810A1 (en) 2003-04-11 2004-10-14 Hypertherm, Inc. Method and apparatus for alignment of components of a plasma arc torch
WO2004093502A1 (en) 2003-04-11 2004-10-28 Hypertherm, Inc. Method and apparatus for alignment of components of a plasma arc torch

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009059108A1 (de) * 2009-12-18 2011-06-22 Holma Ag Elektrode mit Kühlrohr für eine Plasmaschneidvorrichtung
US9095037B2 (en) 2010-02-04 2015-07-28 Holma Ag Nozzle for a liquid-cooled plasma cutting torch with grooves
EP2640167A1 (de) * 2012-03-15 2013-09-18 Manfred Hollberg Plasmaelektrode für eine Plasma-Schneidvorrichtung
WO2013135384A1 (de) * 2012-03-15 2013-09-19 Manfred Hollberg Plasmaelektrode für eine plasma-schneidvorrichtung
US9114475B2 (en) 2012-03-15 2015-08-25 Holma Ag Plasma electrode for a plasma cutting device
WO2017180550A1 (en) * 2016-04-11 2017-10-19 Hypertherm, Inc. Arc cutting system, including coolant tubes and other consumables, and related operational methods
US10129969B2 (en) 2016-04-11 2018-11-13 Hypertherm, Inc. Arc cutting system, including coolant tubes and other consumables, and related operational methods
WO2021155874A1 (en) * 2020-02-05 2021-08-12 B&Bartoni, spol. s r.o. Electrode assembly for plasma arc torch with the improved electric current transfer

Also Published As

Publication number Publication date
FR2910224A1 (fr) 2008-06-20

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