EP0176004B1 - Plasmabrenner - Google Patents

Plasmabrenner Download PDF

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Publication number
EP0176004B1
EP0176004B1 EP85111482A EP85111482A EP0176004B1 EP 0176004 B1 EP0176004 B1 EP 0176004B1 EP 85111482 A EP85111482 A EP 85111482A EP 85111482 A EP85111482 A EP 85111482A EP 0176004 B1 EP0176004 B1 EP 0176004B1
Authority
EP
European Patent Office
Prior art keywords
wall part
insulating
head
end wall
plasma torch
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 - Lifetime
Application number
EP85111482A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0176004A2 (de
EP0176004A3 (en
Inventor
Hans Josef Dr. Rer. Nat. Bebber
Heinrich-Otto Dipl.-Ing. Rossner
Gebhard Dipl.-Ing. Tomalla
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Priority to AT85111482T priority Critical patent/ATE69133T1/de
Publication of EP0176004A2 publication Critical patent/EP0176004A2/de
Publication of EP0176004A3 publication Critical patent/EP0176004A3/de
Application granted granted Critical
Publication of EP0176004B1 publication Critical patent/EP0176004B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05H1/32—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 invention relates to a plasma torch according to the preamble of patent claim 1.
  • the central electrode unit surrounded by the nozzle, which can consist of a single electrode or a central auxiliary electrode and a main electrode concentrically surrounding it, and a counter electrode, e.g. can be given by a metallic bath melt, form a stable arc column.
  • a counter electrode e.g. can be given by a metallic bath melt.
  • parasitic arcs burn parallel to the main arc, in particular including the lower edge of the outer burner or nozzle jacket or the outer region of the nozzle end face in the current flow.
  • the first current path being formed by an inner secondary arc which electrically bridges the relatively short distance between the electrode and the nozzle
  • the second current path is the metallic conductor represented by the nozzle
  • the last one Current path is formed by a double arc, which is from the outside
  • the burner or nozzle jacket or the outer area of the nozzle face to the counter electrode burns.
  • Such parasitic arcs can occur especially when using powerful liquid-cooled plasma torches in hot furnaces, e.g. when melting scrap, and cause the premature failure of a plasma torch, mainly through melting of the front part of the nozzle shell or the end wall of the nozzle, but also due to excessive wear on the burner electrode.
  • the present invention has for its object to provide a plasma torch from which the damage caused by parasitic arcs can be effectively and sustainably kept away by simple means.
  • the nozzle 1 has a centrally arranged, water-cooled electrode 1, the tip 2 of which is formed with a conical outer surface 3 and a flat end surface 4.
  • the electrode 1 is surrounded by a likewise water-cooled burner nozzle 5 - hereinafter also referred to only as a nozzle - coaxial to the axis 1 'of the electrode 1.
  • the nozzle 5 has an essentially cylindrical passage bore 6 which narrows towards the end face 7 of the nozzle 5 via an inner cone 8.
  • the inside diameter of the passage bore 6 is in each case larger than the outside diameter of the electrode 1, which is why there is an annular passage channel 9 between the electrode 1 and the nozzle 5.
  • insulating pieces 10 are arranged to isolate the nozzle 5 from the electrode 1, as described for example in US Pat. No. 3,147,329.
  • the nozzle 5 has a rotationally symmetrical inner wall part 11, a rotationally symmetrical outer wall part 12 arranged concentrically therewith and an end wall part 13 connecting both wall parts 11, 12 on the end face. Between the inner wall part 11 and the outer wall part 12 there is also a partition 14 which forms the cooling water path.
  • a first rotationally symmetrical insulating piece 17 is arranged in the end wall part 13.
  • a second rotationally symmetrical insulating piece 18 is - seen from the end face 7 of the nozzle 5 - inserted into the beginning of the cylindrical section of the inner wall part 11.
  • the insulating piece or the insulating ring 17 is provided on its inside with an internal thread 21 which is in engagement with an external thread 22 on the inner section 13 ′ of the end wall part 13.
  • the insulating ring 17 also has an annular extension 23, through which a shoulder to the external thread 21 is formed.
  • a sealing ring 25 is pressed against a flange 26 arranged on the inner section 13 ′ of the end wall part 13.
  • the outer side 27 of the insulating ring 17 is cylindrical and is in engagement with a corresponding wall 28 of the outer section 13 ′′ of the end wall part 13.
  • the outer section 13 ′′ of the end wall part 13 is provided with a groove 29, in which a sealing ring 30 is inserted.
  • the first insulating ring 17a has a smooth cylindrical inner surface 31 with which it comes to bear against a corresponding cylindrical surface 32 of the inner end wall part 13 '.
  • the insulating ring 17a On its outside, has a flange 33 on the end face facing the partition 14, which flange is received by a corresponding recess 34 in the outer end wall part 13 ′′.
  • the insulating ring 17b consists essentially of a metallic material 36, e.g. Copper, which is from a self-contained surface layer 37 made of an electrically insulating material, e.g. Zirconia is surrounded.
  • the insulating ring 17c according to FIG. 5 is in turn surrounded by a self-contained electrically insulating coating 37. Inside, the insulating ring 17c is formed from a plurality of concentrically composed layers 38, 39, of which at least every second layer 39 represents an electrically non-conductive insulating layer.
  • the self-contained insulating coating is omitted from the insulating ring 17d according to FIG. 6.
  • This ring has only two metallic layers 38 ', 38' 'which are mechanically held together by an insulating layer 39' formed from a potting compound.
  • the insulating ring 17d designed in this way is overall more scratch-resistant and can be sealed well against the wall parts 13 ′ and 13 ′′ of the nozzle 5.
  • the inner section 13 'of the end wall part 13 and the section 13''of the end wall part 13 connected to the outer wall part each have a flange-like extension 40, 41, so that a coaxial connection with respect to the axis 1' two sections 13 ', 13''guaranteed is.
  • their mutually facing surface parts are each provided with an insulating layer 42 or 43, which can also extend to the adjacent parallel surface parts, cf. eg layer 42 'on section 13'.
  • the joined connection is made watertight by a sealing ring 44 clamped between the two shoulders 40, 41.
  • the connection of the sections 13 ', 13''of the end wall part 13 is shown in solid lines before assembly and after assembly - on the left-hand side - indicated by dash-dotted lines.
  • the inner wall part 11 of the nozzle 5 is formed by its outer wall part 12 by an insulating point with two insulating rings 17e, 17f arranged axially one behind the other.
  • the ring 17e which is arranged flush on the end face 7 of the nozzle 5, consists of an insulating material that is resistant to temperature changes, and the ring 17f located behind it consists of a water-impermeable insulating material.
  • the second insulating ring 18 - cf. 10 also has an external thread 46, 47 on its outside on each end face, which engages in a corresponding internal thread 48, 49 on the front and rear section 11 ′ and 11 ′′ of the inner wall part 11.
  • two flat seals 50 are provided, which correspond between a flange-like projection 51 of the insulating ring and end faces axial projections 52, 53 of the two sections 11 'and 11''of the inner wall part 11 are clamped.
  • a second insulating ring 18a which has a Z-shaped cross section. At one end, the insulating ring 18a has an external thread 54 which is offset towards the center and which engages with a corresponding internal thread 55 in the rear section 11 ′′. At the same end there is also a recessed cylindrical part 56 which engages in a corresponding recess 57 in the rear section 11 ′′. The cylindrical connection 56/57 is sealed by an O-ring 58. At the opposite end of the second insulating ring 18a there is an extension starting from the inner surface 60 with an internal thread 62 which is in engagement with a corresponding external thread 63 of the front section 11 ′ of the inner wall part 11.
  • an O-ring 64 is provided which is supported in a groove 65 in the front section 11' of the inner wall part 11 and presses against a cylindrical recess 66 of the insulating ring 18a.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
EP85111482A 1984-09-28 1985-09-11 Plasmabrenner Expired - Lifetime EP0176004B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85111482T ATE69133T1 (de) 1984-09-28 1985-09-11 Plasmabrenner.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843435680 DE3435680A1 (de) 1984-09-28 1984-09-28 Plasmabrenner
DE3435680 1984-09-28

Publications (3)

Publication Number Publication Date
EP0176004A2 EP0176004A2 (de) 1986-04-02
EP0176004A3 EP0176004A3 (en) 1988-05-25
EP0176004B1 true EP0176004B1 (de) 1991-10-30

Family

ID=6246632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85111482A Expired - Lifetime EP0176004B1 (de) 1984-09-28 1985-09-11 Plasmabrenner

Country Status (10)

Country Link
US (1) US4645899A (no)
EP (1) EP0176004B1 (no)
JP (1) JPH0695478B2 (no)
AT (1) ATE69133T1 (no)
CA (1) CA1241704A (no)
DD (1) DD238500A5 (no)
DE (1) DE3435680A1 (no)
ES (1) ES296059Y (no)
NO (1) NO167444C (no)
ZA (1) ZA857473B (no)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3642375A1 (de) * 1986-12-11 1988-06-23 Castolin Sa Verfahren zur aufbringung einer innenbeschichtung in rohre od. dgl. hohlraeume engen querschnittes sowie plasmaspritzbrenner dafuer
DE3840485A1 (de) * 1988-12-01 1990-06-07 Mannesmann Ag Fluessigkeitsgekuehlter plasmabrenner mit uebertragenem lichtbogen
US4967055A (en) * 1989-03-31 1990-10-30 Tweco Products Plasma torch
US5164568A (en) * 1989-10-20 1992-11-17 Hypertherm, Inc. Nozzle for a plasma arc torch having an angled inner surface to facilitate and control arc ignition
DE4022112C2 (de) * 1990-07-11 1996-03-14 Mannesmann Ag Plasmabrenner für übertragenen Lichtbogen
DE4022111A1 (de) * 1990-07-11 1992-01-23 Krupp Gmbh Plasmabrenner fuer uebertragenen lichtbogen
DE4034731A1 (de) * 1990-10-30 1992-05-07 Mannesmann Ag Plasmabrenner zum schmelzen und warmhalten von in gefaessen zu behandelnden materialien
GB9108891D0 (en) * 1991-04-25 1991-06-12 Tetronics Research & Dev Co Li Silica production
DE4440323A1 (de) * 1994-11-11 1996-05-15 Sulzer Metco Ag Düse für einen Brennerkopf eines Plasmaspritzgeräts
US5771818A (en) * 1996-05-20 1998-06-30 Prometron Technics Co., Ltd. Cooling system for waste disposal device
DE19828633B4 (de) * 1998-06-26 2004-07-29 Wirth, Aloisia Lichtbogenschweiß- oder -schneidbrenner sowie Kühlsystem, Plasmadüsen bzw. WIG-Elektrodenspannzangen, Spannsystem für Plasmaelektrodennadeln u. verfahrensübergreifendes Konstruktionsprinzip hierfür
US6677551B2 (en) * 1998-10-23 2004-01-13 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
US6498317B2 (en) 1998-10-23 2002-12-24 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
US7019254B2 (en) * 2002-04-19 2006-03-28 Thermal Dynamics Corporation Plasma arc torch
US9285066B2 (en) * 2009-01-15 2016-03-15 Cheminee Securite International Ltee Positive pressure pipe coupling
DE102009008250B4 (de) * 2009-02-03 2011-03-17 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Brenner für das Wolfram-Inertgas-Schweißen, Elektrodeneinheit für und Verfahren zum Betreiben des Brenners
US9949356B2 (en) 2012-07-11 2018-04-17 Lincoln Global, Inc. Electrode for a plasma arc cutting torch
WO2017180553A1 (en) * 2016-04-11 2017-10-19 Hypertherm, Inc. Plasma arc cutting system, including nozzles and other consumables, and related operational methods
US11007593B1 (en) 2017-06-27 2021-05-18 The United States Of America As Represented By The Secretary Of The Navy Vulcan fire torch
GB2568106B (en) * 2017-11-07 2022-09-21 Tetronics Tech Limited Plasma Torch Assembly
US11762139B2 (en) * 2020-08-07 2023-09-19 Optical Coatings Japan Ultraviolet ray transmissive filter and method for producing same

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Publication number Priority date Publication date Assignee Title
US2616017A (en) * 1949-09-07 1952-10-28 Air Reduction Electrode holder for use in inert gas-shielded arc welding
US3147329A (en) * 1955-07-26 1964-09-01 Union Carbide Corp Method and apparatus for heating metal melting furnaces
DE1440628B2 (de) * 1955-07-26 1971-04-22 Union Carbide Corp , New York, N Y (V St A) Lichtbogenbrenner fuer einen lichtbogenofen
US3204076A (en) * 1962-10-04 1965-08-31 Thermal Dynamics Corp Electric arc torch
US3471675A (en) * 1966-04-20 1969-10-07 Union Carbide Corp Arc torch
US3515839A (en) * 1967-04-07 1970-06-02 Hitachi Ltd Plasma torch
DE1615352B2 (de) * 1967-11-02 1971-09-02 VEB Mansfeld Kombinat Wilhelm Pieck, χ 4250 Lutherstadt Eisleben Schaltungsanordnung und vorrichtung fuer plasma handbrenner
DE2140241C3 (de) * 1971-08-26 1975-02-27 Ilja Samojlowitsch Schapiro Verfahren zur Regelung des Betriebszustandes einer Anlage zur Plasmalichtbogenbearbeitung von Werkstücken und Plasmalichtbogenbearbeitungsanlage
BE795236A (fr) * 1972-02-09 1973-05-29 Vysoka Skola Banska Ostrava Bruleur a plasma avec alimentation axiale du gaz stabilisant
DD97364A1 (no) * 1972-06-13 1973-05-14
DD132706A3 (de) * 1974-10-08 1978-10-25 Jochen Boehme Verfahren und einrichtung zum schutz der duesen von werkstueckgepolten plasmabrennern
JPS51105031U (no) * 1975-02-19 1976-08-23
JPS5250198U (no) * 1975-10-07 1977-04-09
CA1111913A (en) * 1977-03-30 1981-11-03 Naoyoshi Hosoda Plasma-arc welding and cutting machine
JPS5524737A (en) * 1978-08-11 1980-02-22 Hitachi Seiko Ltd Plasma welding torch
DD151248A1 (de) * 1978-12-21 1981-10-08 Wenzel Bernd Dieter Schutzvorrichtung fuer plasmatrone hoher leistung
JPS564351A (en) * 1979-06-25 1981-01-17 Sumitomo Electric Ind Ltd Tundish for continuous casting
US4311897A (en) * 1979-08-28 1982-01-19 Union Carbide Corporation Plasma arc torch and nozzle assembly
ZW5683A1 (en) * 1982-03-05 1983-06-01 Mineral Tech Council The protection of water cooled plasma generating devices
DE3241476A1 (de) * 1982-11-10 1984-05-10 Fried. Krupp Gmbh, 4300 Essen Verfahren zur einleitung von ionisierbarem gas in ein plasma eines lichtbogenbrenners und plasmabrenner zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
DD238500A5 (de) 1986-08-20
ZA857473B (en) 1986-05-28
ES296059Y (es) 1988-01-16
DE3435680C2 (no) 1990-02-01
DE3435680A1 (de) 1986-04-03
JPS6188500A (ja) 1986-05-06
ATE69133T1 (de) 1991-11-15
NO167444C (no) 1991-11-06
EP0176004A2 (de) 1986-04-02
NO167444B (no) 1991-07-29
CA1241704A (en) 1988-09-06
US4645899A (en) 1987-02-24
ES296059U (es) 1987-07-16
EP0176004A3 (en) 1988-05-25
NO853683L (no) 1986-04-01
JPH0695478B2 (ja) 1994-11-24

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