EP1993331A2 - Dispositif de torche à plasma et procédé de réalisation d'une électrode pour ce dispositif - Google Patents

Dispositif de torche à plasma et procédé de réalisation d'une électrode pour ce dispositif Download PDF

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Publication number
EP1993331A2
EP1993331A2 EP08156329A EP08156329A EP1993331A2 EP 1993331 A2 EP1993331 A2 EP 1993331A2 EP 08156329 A EP08156329 A EP 08156329A EP 08156329 A EP08156329 A EP 08156329A EP 1993331 A2 EP1993331 A2 EP 1993331A2
Authority
EP
European Patent Office
Prior art keywords
electrode
cavity
shaped portion
insert
closed end
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Withdrawn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
EP08156329A
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German (de)
English (en)
Other versions
EP1993331A3 (fr
Inventor
Girogio Bassi
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.)
Tecmo SRL
Original Assignee
Tecmo SRL
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 Tecmo SRL filed Critical Tecmo SRL
Publication of EP1993331A2 publication Critical patent/EP1993331A2/fr
Publication of EP1993331A3 publication Critical patent/EP1993331A3/fr
Withdrawn legal-status Critical Current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
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles

Definitions

  • the present invention refers to cutting devices and in particular it refers to a plasma torch device and a method for carrying out an electrode thereof.
  • torch devices provided with an electrode made of copper alloy and inside provided with a cavity for the air-passage or for other cooling fluid passage and/or fit to form a plasma jet, whose top portion has an insert made of a proper material, as hafnium, having an elongated cylinder shape.
  • the insert may be inserted into a top blind hole of the electrode, having a diameter and a length respectively greater and lower than the diameter and the length of the insert.
  • a drawback of said known hollow electrodes consists in that they may be damaged and deformed by the high deforming pressure of the insert also in presence of a match inside the cavity because the pressure forces may be deflected towards the side surface of said electrode by the match.
  • Another drawback consists in that the known ends, having flat circular shape or conical extension, of the cavities of the electrode may reduce the cooling of the electrode top, probably due to stagnations of the cooling fluid adduced into the cavity of the electrode by a nozzle.
  • the cooling may be unhomogeneous, for instance excessive in some zones and insufficient in others, in particular in the zones nearer to the primer zone.
  • An object of the present invention is to propose a plasma torch device with an electrode whose inner terminal end, of the respective cavity, has a special shape for matching with a respective and complementary match in such a way to avoid deformations of the electrode during the deformation of the insert.
  • Further object is to propose a torch in which a terminal end of the cavity of the electrode has a special shape suitable to improve the cooling of the top portion of the electrode.
  • a further object is to propose a method for carrying out the electrode of said torch.
  • the numeral 1 indicates a plasma torch device object of the present invention.
  • the plasma torch device 1 comprises a nozzle 2 provided with an outlet for the plasma 3 and containing an electrode 4 with which defines an interspace 21 interposed between them.
  • the end portion of the electrode turned towards the outlet for the plasma 3 of the nozzle has a housing into which is blocked the insert 5 for instance made of hafnium or its alloys, tungsten or its alloys or other alloys.
  • the electrode is carried out in copper or its alloys, for instance in tellurium-copper, or in silver or its alloys or in other alloys, and is also provided with a longitudinal inner cavity 6 having a closed end 8 corresponding to the end portion having the insert 5 and the opposite opened end 7.
  • the plasma device comprises a lip means 11, duct shaped, having an end portion flowing into the longitudinal inner cavity 6 of the electrode 4 near a shaped portion 9 of the closed end 8 and fit to adduce a fluid for the cooling and for the plasma along said cavity 6.
  • the outlet end for the fluid or the end portion of the lip means 11 which flows into the cavity 6 of the electrode has optionally a set of grooves or recesses 12.
  • the lip end portion 11 opposite to the portion which flows into the cavity 6 is connected to a supply duct 20 connected to an outer source of the fluid for supplying the lip 11 and, against the stream, the cavity 6 with a cooling fluid flow and partially fit to form the fluid.
  • the closed end 8 of the electrode 4 has, opposite and aligned to the housing for the insert 5, a shaped portion 9 having shape almost conical and protruding inwardly the longitudinal cavity 6 and with the vertex 10 turned towards the open end 7 of said cavity 6.
  • the side wall 13 of the longitudinal inner cavity 6 is almost cylindrical and the base of the closed end 8 of the shaped portion 9 is linked to said cylindrical wall 13 by means of a connection surface 14 having annular torus portion that is an outer annular sector of a ring having circular or oval section.
  • the shaped portion 9 of the closed end 8 is fit at least to match with a concave end housing, having shape almost complementary to said shaped portion, of a match during the blocking by pressure deformation of the insert 5 in the respective housing.
  • the shaped portion 9 of the closed end 8 is fit to at least drive the fluid flow near the closed end 8 in order to improve the cooling of the closed end portion of the electrode avoiding the formation of fluid stagnations.
  • the useful section met by the fluid in passing in sequence the supply duct 20, the lip means 11, the outer portion to the latter in the cavity 6 of the electrode 4 and in passing in parallel the interspace 21 and the cooling ducts 22 up to the outside of the device 1, is almost constant or slightly increasing outward the device 1.
  • the invention further provides that in possible zone of possible overheating or immediately upstream them, the passage section of the fluid may be locally reduced for augmenting the velocity of the fluid in said zones or upstream them.
  • the method of the present invention for carrying out the hollow electrode 4 provides:
  • the operation of the device 1 provides that during the pressure blocking of the insert, thanks to the shape of the shaped portion 9 matching with the match having complementary shape, pressure forces discharge almost totally onto said match without deforming the cylindrical wall of the hollow electrode which, being made of copper or silver alloys, otherwise would be easy to be deformed.
  • the operating provides that the shape of the shaped portion 9 in cooperation with the connection surface 14, allows to the fluid flow to lap on the inner surface of the closed end portion of the cavity avoiding stationary vortexes and stagnations and thus improving the electrical exchange and the cooling of the hottest portion of the electrode.
  • An advantage of the present invention is to provide a plasma torch device with an electrode whose inner terminal end, of the respective cavity, has a special shape for matching with a respective and complementary match in such a way to avoid deformations of the electrode during the deformation of the insert.
  • a further advantage of the present invention is to guarantee a perfect fixing of the insert ant to guarantee the maximum possible thermal conduction and best thermal exchange between the insert and the electrode.
  • a further advantage is to provide a method for carrying out the electrode of said torch.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)
  • Arc Welding In General (AREA)
EP08156329A 2007-05-18 2008-05-16 Dispositif de torche à plasma et procédé de réalisation d'une électrode pour ce dispositif Withdrawn EP1993331A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000361A ITBO20070361A1 (it) 2007-05-18 2007-05-18 Dispositivo a torcia al plasma e metodo per realizzarne l'elettrodo

Publications (2)

Publication Number Publication Date
EP1993331A2 true EP1993331A2 (fr) 2008-11-19
EP1993331A3 EP1993331A3 (fr) 2012-01-04

Family

ID=39708820

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08156329A Withdrawn EP1993331A3 (fr) 2007-05-18 2008-05-16 Dispositif de torche à plasma et procédé de réalisation d'une électrode pour ce dispositif

Country Status (2)

Country Link
EP (1) EP1993331A3 (fr)
IT (1) ITBO20070361A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102851083A (zh) * 2012-09-12 2013-01-02 衢州市广源生活垃圾液化技术研究所 等离子体气化喷枪
CN105519239A (zh) * 2013-09-05 2016-04-20 特拉菲迈特股份公司 具有改进的冷却系统和相应冷却方法的等离子体焰炬

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4059743A (en) * 1974-10-28 1977-11-22 Eduard Migranovich Esibian Plasma arc cutting torch
US5023425A (en) * 1990-01-17 1991-06-11 Esab Welding Products, Inc. Electrode for plasma arc torch and method of fabricating same
US5124525A (en) * 1991-08-27 1992-06-23 Esab Welding Products, Inc. Plasma arc torch having improved nozzle assembly
EP0820216A1 (fr) * 1996-07-18 1998-01-21 TRAFIMET S.p.A. Torche à plasma dépourvue d'allumage à haute fréquence, à dispositifs de refroidissement à air des électrodes
US6114650A (en) * 1998-08-12 2000-09-05 The Esab Group, Inc. Electrode for plasma arc torch and method of making same
US20060102598A1 (en) * 2004-11-16 2006-05-18 Hypertherm, Inc. Plasma arc torch having an electrode with internal passages
WO2006122410A1 (fr) * 2005-05-17 2006-11-23 Huys Industries Limited Electrode et procede de soudage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4059743A (en) * 1974-10-28 1977-11-22 Eduard Migranovich Esibian Plasma arc cutting torch
US5023425A (en) * 1990-01-17 1991-06-11 Esab Welding Products, Inc. Electrode for plasma arc torch and method of fabricating same
US5124525A (en) * 1991-08-27 1992-06-23 Esab Welding Products, Inc. Plasma arc torch having improved nozzle assembly
EP0820216A1 (fr) * 1996-07-18 1998-01-21 TRAFIMET S.p.A. Torche à plasma dépourvue d'allumage à haute fréquence, à dispositifs de refroidissement à air des électrodes
US6114650A (en) * 1998-08-12 2000-09-05 The Esab Group, Inc. Electrode for plasma arc torch and method of making same
US20060102598A1 (en) * 2004-11-16 2006-05-18 Hypertherm, Inc. Plasma arc torch having an electrode with internal passages
WO2006122410A1 (fr) * 2005-05-17 2006-11-23 Huys Industries Limited Electrode et procede de soudage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102851083A (zh) * 2012-09-12 2013-01-02 衢州市广源生活垃圾液化技术研究所 等离子体气化喷枪
CN102851083B (zh) * 2012-09-12 2013-09-18 衢州市广源生活垃圾液化技术研究所 等离子体气化喷枪
CN105519239A (zh) * 2013-09-05 2016-04-20 特拉菲迈特股份公司 具有改进的冷却系统和相应冷却方法的等离子体焰炬
US10076019B2 (en) 2013-09-05 2018-09-11 Trafimet S.P.A. Plasma torch with improved cooling system and corresponding cooling method

Also Published As

Publication number Publication date
EP1993331A3 (fr) 2012-01-04
ITBO20070361A1 (it) 2008-11-19

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