EP0110735B1 - Torche à plasma monogaz - Google Patents

Torche à plasma monogaz Download PDF

Info

Publication number
EP0110735B1
EP0110735B1 EP83401896A EP83401896A EP0110735B1 EP 0110735 B1 EP0110735 B1 EP 0110735B1 EP 83401896 A EP83401896 A EP 83401896A EP 83401896 A EP83401896 A EP 83401896A EP 0110735 B1 EP0110735 B1 EP 0110735B1
Authority
EP
European Patent Office
Prior art keywords
gas
plasma torch
orifices
electrode holder
torch according
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.)
Expired
Application number
EP83401896A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0110735A3 (en
EP0110735A2 (fr
Inventor
Gérard Marhic
Didier Schaff
Francis Remy
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.)
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Lincoln Electric Co France SA
Original Assignee
La Soudure Autogene Francaise
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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 La Soudure Autogene Francaise, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical La Soudure Autogene Francaise
Publication of EP0110735A2 publication Critical patent/EP0110735A2/fr
Publication of EP0110735A3 publication Critical patent/EP0110735A3/fr
Application granted granted Critical
Publication of EP0110735B1 publication Critical patent/EP0110735B1/fr
Expired 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
    • 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

Definitions

  • the present invention relates to a plasma torch of the type comprising a single gas supply conduit which opens into a metal electrode holder, and dividing means for dividing the gas stream into a first stream of plasma gas and into a second cooling gas flow.
  • a plasma torch of the type comprising a single gas supply conduit which opens into a metal electrode holder, and dividing means for dividing the gas stream into a first stream of plasma gas and into a second cooling gas flow.
  • torches will be designated by the expression “single gas plasma torches”.
  • the object of the invention is to provide a single gas plasma torch which is capable of operating satisfactorily under real conditions of use.
  • the subject of the invention is a plasma torch of the aforementioned type, characterized in that said dividing means comprise orifices all formed in the same metal part or in metal parts having similar coefficients of expansion, in particular in the electrode holder or in a metal nozzle holder.
  • a tubular baffle which directs the gas entering first on the active part of the electrode and then towards said orifices .
  • the latter can be guided between a nozzle holder and an annular skirt provided with at least one ambient air intake bore, and / or an additional passage can connect the gas inlet at a point in the cooling circuit located downstream of said baffle.
  • the plasma cutting torch shown in the drawing comprises a handle 1 and, at the end thereof, a cutting head 2 which is in the assembly of revolution about an axis X-X.
  • a cutting head 2 which is in the assembly of revolution about an axis X-X.
  • the vertical axis XX and the head 2 directed downwards.
  • the electrode holder 9 has an exterior stepped shape; its upper part, in the region of the gas inlet 11, ends in a horizontal shoulder 18 and is followed by an intermediate part of slightly smaller diameter; a second horizontal shoulder 19 connects the latter to a lower part of markedly smaller diameter, approximately equal to the outside diameter of the cup 13.
  • the second metal assembly 7 consists of two parts, namely a tubular nozzle holder 22 and a cup-shaped nozzle 23 whose upper edge is screwed to the lower end of the nozzle holder and whose bottom is pierced with an axial hole 24.
  • the insulator 8 made of an appropriate insulating material, has three parts: an upper part threaded on the intermediate part of the electrode holder 9 and abutting against the shoulder 18, an intermediate part of greater thickness which delimits with the shoulder 19 an annular chamber 25 and is pierced with a series of longitudinal passages 26, and a lower part which surrounds with an annular clearance the electrode holder in the region of the orifices 21.
  • the chamber 25 is also connected directly to the end upper part of the conduit 10 of the electrode holder by one or more additional passages 27.
  • the nozzle holder 22 comprises an upper part threaded on the intermediate and upper parts of the insulator 8, a thicker intermediate part threaded on the lower part of this insulator, and a lower part receiving the nozzle.
  • the intermediate part of the nozzle holder defines with that of the insulator an annular chamber 28 and is also pierced with a series of longitudinal passages 29. These latter open into a final annular chamber 30 delimited internally by the lower part of the nozzle holder 22 and by the nozzle and externally by an insulating skirt 31 screwed or fixed by another means on the upper part of the nozzle holder.
  • the skirt 31 is pierced with several suction holes 32 inclined inwards and downwards.
  • the torch is completed by an insulating coating 33 made of plastic which constitutes the external part of the handle 1 and of the head 2 up to the level of the upper edge of the skirt 31.
  • the assembly 6 is brought via the tube 3 to an appropriate potential with respect to the workpiece (not shown), the assembly 7 is brought to an intermediate potential by means of the cable 5, and a suitable gas, for example compressed air, is sent into tube 3.
  • a suitable gas for example compressed air
  • the gas enters through the inlet 11 in the conduit 10, descends through the baffle 17, passes over the projection 14 of the electrode and rises in the annular space 34 existing between the cup 13 and the baffle 17 , then between it and the wall of the duct 10.
  • a relatively small fraction (for example 10%) of the gas leaves the annular space 34 through the two holes 21 to form an injection of plasma gas in the annular gap provided at this level between the electrode holder 9 and the insulator 8, then in the annular chamber left free under the latter between the nozzle 23 and the cup 13.
  • This plasma gas leaves the head 2 through the central orifice 24.
  • the rest of the gas which has reached the annular space 34 is used to cool the head 2 and in particular the nozzle 23.
  • This gas leaves the electrode holder through the orifices 20 and passes successively into the annular chamber 25, in the passages 26, in the annular chamber 28, in the passages 29 and in the annular chamber 30, from where it is discharged down into the surrounding medium.
  • a certain flow of gas passes directly from the inlet 11 to the chamber 25 through the passages 27 of the electrode holder, and the flow of the cooling gas in the chamber 30 draws a significant quantity of ambient air through the holes 32 of the skirt 31.
  • the fraction of the outgoing flow through the orifices 21 can be adjusted precisely because all the orifices 20 and 21 are drilled in the same piece, which expands uniformly. This would also remain valid if the electrode holder consisted of several parts having similar expansion coefficients. In addition, these orifices, and in particular the orifices 21, can easily be produced with a very small diameter since they are drilled in a metal part. On the other hand, the passages 26 of the insulator 8, which have only a role of guiding the cooling gas, can have a diameter clearly greater than that of the orifices 20, because their diameter is not critical.
  • the fresh gas which enters the cooling circuit downstream of the orifices 20 through the passages 27 and the fresh air drawn in through the holes 32 make it possible to obtain, at each level, a cooling gas at a temperature low enough to play its role of effectively.
  • the gas leaving the passages 27 keeps the insulator 8 at a temperature below the softening temperature of certain plastics, which is very advantageous for mass production.
  • the fact of piercing passages 27 in the same metal part as the orifices 20 and 21 allows a good adjustment of the fraction of gas thus deflected.
  • the two series of orifices constituting the flow divider could be made in one or in two metal parts forming the nozzle holder.
  • the electrode holder would no longer have the orifices 21, and all the gas contained in the annular space 34 would come out through the orifices 20 to be partially reinjected into the plasma gas chamber.
  • This variant has been shown schematically, in principle, in FIG. 1, where there is indicated in phantom the conduits 21A connecting the chamber 28 to the plasma gas chamber and drilled in the nozzle holder 22, the lower part of the isolator 8 being removed to allow this connection.
  • the total gas flow is divided by the conduits 29 and 21A, which are all formed in the same metal part 22.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)
  • Arc Welding In General (AREA)
EP83401896A 1982-10-01 1983-09-28 Torche à plasma monogaz Expired EP0110735B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8216512 1982-10-01
FR8216512A FR2534106A1 (fr) 1982-10-01 1982-10-01 Torche a plasma monogaz

Publications (3)

Publication Number Publication Date
EP0110735A2 EP0110735A2 (fr) 1984-06-13
EP0110735A3 EP0110735A3 (en) 1984-10-24
EP0110735B1 true EP0110735B1 (fr) 1987-11-19

Family

ID=9277904

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401896A Expired EP0110735B1 (fr) 1982-10-01 1983-09-28 Torche à plasma monogaz

Country Status (11)

Country Link
US (1) US4625094A (es)
EP (1) EP0110735B1 (es)
JP (1) JPS5983400A (es)
AU (1) AU561117B2 (es)
BR (1) BR8305417A (es)
CA (1) CA1218118A (es)
DE (2) DE110735T1 (es)
ES (1) ES283176Y (es)
FR (1) FR2534106A1 (es)
PT (1) PT77416B (es)
ZA (1) ZA837071B (es)

Families Citing this family (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581516A (en) * 1983-07-20 1986-04-08 Thermal Dynamics Corporation Plasma torch with a common gas source for the plasma and for the secondary gas flows
FR2574614B1 (fr) * 1984-12-07 1987-01-30 Soudure Autogene Francaise Procede et dispositif de formation d'un arc plasma
GB8508758D0 (en) * 1985-04-03 1985-05-09 Goodwin Eng Developments Ltd D Plasma arc apparatus
JPS6296969U (es) * 1985-12-05 1987-06-20
JPH0329022Y2 (es) * 1986-03-12 1991-06-20
US4748312A (en) * 1986-04-10 1988-05-31 Thermal Dynamics Corporation Plasma-arc torch with gas cooled blow-out electrode
GB8615759D0 (en) * 1986-06-27 1986-08-06 W T C Holdings Ltd Air plasma arc torch
US4716269A (en) * 1986-10-01 1987-12-29 L-Tec Company Plasma arc torch having supplemental electrode cooling mechanisms
FR2609591B1 (fr) * 1987-01-13 1990-12-07 Soudure Autogene Francaise Coiffe pour torche de travail a l'arc et torche correspondante
US4902871A (en) * 1987-01-30 1990-02-20 Hypertherm, Inc. Apparatus and process for cooling a plasma arc electrode
US5041713A (en) * 1988-05-13 1991-08-20 Marinelon, Inc. Apparatus and method for applying plasma flame sprayed polymers
US4985610A (en) * 1988-05-26 1991-01-15 E. I. Du Pont De Nemours And Company Cutting torch
US5396043A (en) * 1988-06-07 1995-03-07 Hypertherm, Inc. Plasma arc cutting process and apparatus using an oxygen-rich gas shield
US5120930A (en) * 1988-06-07 1992-06-09 Hypertherm, Inc. Plasma arc torch with improved nozzle shield and step flow
US5695662A (en) * 1988-06-07 1997-12-09 Hypertherm, Inc. Plasma arc cutting process and apparatus using an oxygen-rich gas shield
US5070227A (en) * 1990-04-24 1991-12-03 Hypertherm, Inc. Proceses and apparatus for reducing electrode wear in a plasma arc torch
US5132512A (en) * 1988-06-07 1992-07-21 Hypertherm, Inc. Arc torch nozzle shield for plasma
IN180745B (es) * 1990-01-17 1998-03-14 Univ Sydney
US5039837A (en) * 1990-02-23 1991-08-13 Tescom Corporation Plasma torch head, body, handle and control circuitry
DE4022112C2 (de) * 1990-07-11 1996-03-14 Mannesmann Ag Plasmabrenner für übertragenen Lichtbogen
JPH0463599U (es) * 1990-10-11 1992-05-29
IT1243170B (it) * 1990-11-29 1994-05-24 Trafimet Trafilerie Metalliche Torcia per taglio al plasma con innesco per contatto
US5317126A (en) * 1992-01-14 1994-05-31 Hypertherm, Inc. Nozzle and method of operation for a plasma arc torch
US5214262A (en) * 1992-04-03 1993-05-25 Esab Welding Products, Inc. Electrode adaptor
USD384682S (en) * 1995-09-13 1997-10-07 The Esab Group, Inc. Electrode for a plasma arc torch
JPH10241625A (ja) * 1997-02-24 1998-09-11 Hitachi Ltd プラズマイオン源質量分析装置及び方法
US6130399A (en) * 1998-07-20 2000-10-10 Hypertherm, Inc. Electrode for a plasma arc torch having an improved insert configuration
US6677551B2 (en) * 1998-10-23 2004-01-13 Innerlogic, Inc. Process for operating a plasma arc torch
US6163009A (en) * 1998-10-23 2000-12-19 Innerlogic, Inc. Process for operating a plasma arc torch
US6498317B2 (en) 1998-10-23 2002-12-24 Innerlogic, Inc. Process for operating a plasma arc torch
US6326583B1 (en) 2000-03-31 2001-12-04 Innerlogic, Inc. Gas control system for a plasma arc torch
US6498316B1 (en) 1999-10-25 2002-12-24 Thermal Dynamics Corporation Plasma torch and method for underwater cutting
US6337460B2 (en) 2000-02-08 2002-01-08 Thermal Dynamics Corporation Plasma arc torch and method for cutting a workpiece
US6667459B1 (en) * 2000-11-21 2003-12-23 Hypertherm, Inc. Configurable nozzle baffle apparatus and method
EP1369000B1 (en) * 2001-03-09 2012-04-18 Hypertherm, Inc. Method of manufacturing a composite electrode for a plasma arc torch
US8338740B2 (en) * 2008-09-30 2012-12-25 Hypertherm, Inc. Nozzle with exposed vent passage
DE102009016932B4 (de) * 2009-04-08 2013-06-20 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Kühlrohre und Elektrodenaufnahme für einen Lichtbogenplasmabrenner sowie Anordnungen aus denselben und Lichtbogenplasmabrenner mit denselben
ITBO20090496A1 (it) * 2009-07-28 2011-01-29 Cebora Spa Torcia monogas per il taglio al plasma.
IT1401407B1 (it) * 2010-07-30 2013-07-26 Cebora Spa Torcia monogas per il taglio al plasma.
EP2734015B1 (de) * 2012-05-07 2016-10-19 Manfred Hollberg Kühlrohr für einen Plasma-Lichtbogenbrenner
US9949356B2 (en) 2012-07-11 2018-04-17 Lincoln Global, Inc. Electrode for a plasma arc cutting torch
ITVI20130220A1 (it) * 2013-09-05 2015-03-06 Trafimet Spa Torcia al plasma con sistema di raffreddamento perfezionato e relativo metodo di raffreddamento.

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US2960594A (en) * 1958-06-30 1960-11-15 Plasma Flame Corp Plasma flame generator
FR1322260A (fr) * 1962-02-14 1963-03-29 Saint Gobain Chalumeau à flamme de plasma
US3562486A (en) * 1969-05-29 1971-02-09 Thermal Dynamics Corp Electric arc torches
US3832513A (en) * 1973-04-09 1974-08-27 G Klasson Starting and stabilizing apparatus for a gas-tungsten arc welding system
SE376859B (es) * 1974-06-20 1975-06-16 Vni Pk T I Elektrosvarotschno
FR2275270A1 (fr) * 1974-06-21 1976-01-16 Inst Elektrosvarochnogo Oborud Dispositif pour le travail de materiaux conducteurs au plasma et procede d'utilisation dudit dispositif
JPS5112360A (en) * 1974-07-19 1976-01-30 Vni Pk T I Elektrosvarotschno Dendobutsushitsuno purazumakakosochioyobisono sadohoho
US4463245A (en) * 1981-11-27 1984-07-31 Weldtronic Limited Plasma cutting and welding torches with improved nozzle electrode cooling

Also Published As

Publication number Publication date
PT77416A (fr) 1983-10-01
CA1218118A (fr) 1987-02-17
JPH0226360B2 (es) 1990-06-08
EP0110735A3 (en) 1984-10-24
AU1933883A (en) 1984-04-05
PT77416B (fr) 1986-03-20
FR2534106B1 (es) 1985-04-19
FR2534106A1 (fr) 1984-04-06
BR8305417A (pt) 1984-05-15
US4625094A (en) 1986-11-25
DE110735T1 (de) 1986-02-13
JPS5983400A (ja) 1984-05-14
DE3374644D1 (en) 1987-12-23
EP0110735A2 (fr) 1984-06-13
ZA837071B (en) 1984-05-30
ES283176U (es) 1985-05-16
AU561117B2 (en) 1987-04-30
ES283176Y (es) 1985-12-16

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