EP0750451A1 - Torche à plasma à bobine électromagnétique de déplacement du pied d'arc indépendante et intégrée - Google Patents

Torche à plasma à bobine électromagnétique de déplacement du pied d'arc indépendante et intégrée Download PDF

Info

Publication number
EP0750451A1
EP0750451A1 EP96450015A EP96450015A EP0750451A1 EP 0750451 A1 EP0750451 A1 EP 0750451A1 EP 96450015 A EP96450015 A EP 96450015A EP 96450015 A EP96450015 A EP 96450015A EP 0750451 A1 EP0750451 A1 EP 0750451A1
Authority
EP
European Patent Office
Prior art keywords
torch
coil
support
electrode
upstream
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Withdrawn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
EP96450015A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-Marie Jacques Spariat
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.)
Airbus Group SAS
Original Assignee
Airbus Group SAS
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 Airbus Group SAS filed Critical Airbus Group SAS
Publication of EP0750451A1 publication Critical patent/EP0750451A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • H05H1/40—Details, e.g. electrodes, nozzles using applied magnetic fields, e.g. for focusing or rotating the arc

Definitions

  • the present invention relates generally to industrial plasma torches and more particularly to an electromagnetic coil for displacement of the arc foot of such torches.
  • field coil The principle of such a coil, called field coil, is well known. It aims to constrain the base of the electric arc to the right of the upstream electrode, whether it is a plasma torch of an arc transferred with a single electrode, called upstream, the other electrode, called downstream, being outside the torch, or a plasma torch of non-transferred arc, the two electrodes, upstream and downstream, being arranged inside the torch, to move in order to reduce and distribute the 'erosion wear due to the arc of the electrode.
  • the field coil is independent of the plasma torch and threaded externally on the envelope of the torch enclosing the upstream electrode. Such an embodiment turns out to be bulky and expensive.
  • the field coil is squarely integrated into the upstream electrode which it wraps tightly so that it is totally dependent on this electrode both diameter, in axial position and with regard to the electrical connection which is of the series type.
  • the present invention aims to overcome these various drawbacks and contingencies by proposing a new design of field coil ensuring both independence and integration with respect to the upstream electrode and a modularity which, associated with the removable nature of the coil , allows to equip the same torch with field coils of different characteristics.
  • the subject of the invention is a plasma torch with an independent and integrated electromagnetic coil for displacement of the arc foot, said torch comprising a part, known as a naked torch, in which a single so-called upstream electrode or a pair are arranged. of so-called upstream and downstream coaxial electrodes, the electrodes being tubular and cooled by an appropriate cooling circuit, a so-called field of displacement arc foot coil and means for injecting a plasma gas downstream of the upstream electrode or between the upstream electrode and the downstream electrode, means being further provided for ensuring the starting of the torch, characterized in that said field coil has a generally cylindrical shape and consists of a set of three supports made of material electrically insulating in the form of coaxial cylindrical tubes connected, at one end of said assembly, to a crown provided with electrical connection means connected to the m oins a helical winding formed on at least one of the faces of one of the above three cylindrical supports, said assembly being removable and insertable in the naked torch around said upstream electrode.
  • a torch of the type comprising a naked torch whose supporting structure is formed of three coaxial envelopes overlapping at least partially, namely an external envelope, an intermediate envelope defining with the external envelope the circuit of return of the coolant from the hot part of the torch and an internal envelope defining with the intermediate envelope the intake circuit for the plasma gas and channeling by its internal face the incoming flow of the coolant towards the upstream electrode , from the coil field and possibly of the downstream electrode, characterized in that the coil is inserted between the upstream electrode and a part or an extension of the internal envelope and in that the means of electrical connection of the coil consist of two pins of connection integral with said crown, arranged parallel to the axis of the torch and capable of receiving, by plugging in, electrical connection rods extending inside the internal envelope and connected, at their other end, to electrical terminals provided on said external structure.
  • the central cylindrical support of said assembly is arranged so as to establish communication, on the side of its end facing said crown, between the spaces delimited between the central support and the two adjacent supports, the coil being inserted into the torch or arranged so that the fluid having cooled the external face of the upstream electrode, enters between the central support and the internal support then between the central support and the external support.
  • the coil comprises two helical windings placed respectively on the two opposite faces of the central cylindrical support.
  • the coil comprises four helical windings, placed respectively on the two opposite faces of the central cylindrical support and on the two opposite faces of the two other cylindrical supports.
  • Such a design of the field coil makes it possible to make it independent of the upstream electrode, to change the coil to possibly put another one of different electrical configuration, that is to say with different windings in number, in spatial arrangement. , in power.
  • the coil has a remarkable compactness and is easily integrated in the torch and in particular in the cooling circuit of the electrode (s).
  • the coil can optionally be positioned axially with respect to the upstream electrode, for example by adapting the length of the electrical connection rods.
  • FIG. 1 represents a plasma torch with non-transferred arc of the type described in a patent application filed parallel to the present application.
  • This torch which can be used in particular in vitrification furnaces for waste, comprises a part known as a naked torch 1, formed of three coaxial envelopes partially overlapping, connected at its rear end to an external structure 2 ensuring in particular the connections, that is to say -to say the fluidic and electrical connections with the outside of the torch.
  • an electrode is arranged in the naked torch 1, comprising an external cylindrical metallic envelope 3, an intermediate cylindrical metallic envelope 4 and an electrically insulating cylindrical envelope 5, an electrode is arranged.
  • the upstream electrode 6 can be moved in the direction of the downstream electrode 7, for the purpose of starting the torch, by means of a choke cylinder 10 disposed outside the cylindrical body 11 of the external structure 2.
  • the jack 10 acts on the upstream electrode 6 by a set of rods 12, 13 coaxial with the torch, passing through the body 11 and extending inside the internal envelope 5.
  • the cooling of the hot parts of the torch is carried out by a fluid, demineralized water for example, penetrating into the body 11 by an inlet symbolized by 14 opening into a space delimited by the body 11 and the internal envelope 5 and in which bathes the set of rods 12.13.
  • the cooling fluid then flows by licking the external face of the upstream electrode 6 while being laminated by an annular separator 15, interposed between the electrode 6 and the field coil 9, then crosses, through passages 16, a annular part 17 of the plasma gas injection device 8, licks the external face of the downstream electrode 7 and finally returns to the body 11 through the annular space defined between the external 3 and intermediate envelopes 4.
  • the fluid emerges from the body 11 by an exit symbolized in 18.
  • the injector device 8 is supplied with plasma gas, for example air, introduced into the body 11 by an inlet symbolized at 19 and conveyed to the injector via the annular space delimited between the intermediate envelope 4 and the inner envelope 5.
  • plasma gas for example air
  • the field coil 9 is made up of a cylindrical annular assembly formed of three coaxial cylindrical tubes, joined together with a determined spacing between the central tube 20, and the external 21 and internal 22 tubes.
  • the tubes 20,21,22 are made of electrical insulating material, with the same interval between the central tube 20 and the lateral tubes 21,22.
  • connection between the tubes is made for example by insulating spacers 23.
  • the central tube 20 protrudes by a certain length 24 from the adjacent tubes 21, 22 at the distal end of the coil, while the proximal end of the tube 20 is located at a distance from a crown. 25 connecting the two external 21 and internal 22 tubes.
  • the interval between the central tube 20 and the external tube 21 communicates with the interval between the central tube 20 and the internal tube 22 by an annular passage 26 in the bottom of coil 9.
  • the crown 25 is provided with two pins 27 for electrical connection, arranged diametrically opposite and facing the internal structure 2.
  • the pins 27 are connected to two helical windings in series, namely an internal winding 28a placed on the internal face of the central tube 20 and an external winding 28b placed on the external face of said tube 20
  • an arrangement of the windings which are of small section and therefore give off heat, allows their cooling, as will be emphasized below.
  • the pins 27 ' are connected to four helical windings in series 29a, 29b, 29c, 29d distributed respectively on the external face of the internal tube 21, the internal and external faces of the central tube 20 and the inner face of the outer tube 22.
  • the number, extent and arrangement of the winding (s) on the coil 9 can vary so as to have a great flexibility of adaptation of the magnetic field that is desired get.
  • each pin 27 is capable of being connected, by plugging in, to an electrical connection rod 30, parallel to the axis of the torch, extending inside the internal envelope 5 , passing through the body 11 and connected to a connection terminal 32 accessible outside of said body.
  • another electrical connection terminal 33 accessible outside the body 11 is connected to a rod 34 similar to the rod 30, extending inside the internal envelope 5, being located outside the plane defined by the two rods 30, for example by being angularly offset by 90 ° relative to these two rods 30.
  • the rod 34 is connected to a conductive sleeve 35 slidably mounted on the rod 13 for moving the upstream electrode 6, which rod 13 provides electrical conduction with said electrode 6.
  • the coil is supplied by the two terminals 32 connected to the two pins 27 of the coil.
  • the upstream electrode 6 is supplied from the terminal 33, by the rods 13, 34 and the part 35, the current return from the downstream electrode 7 being effected by the external casing 3, the body 11 and the terminal 36 of the structure 2.
  • the three rods 30, 34 will be angularly offset between them by 120 °, the two pins 27 not being more then diametrically opposite as illustrated in FIGS. 2 to 4.
  • one of the pins 27 is connected to the part 35 as illustrated in FIG. 6 by means of a screw. connection V, the rod 34 not being mounted.
  • one of the terminals 32 is connected to one of the pins 27 and the terminal 33 is connected both to the upstream electrode 6 and to the 'other pin (27) by an auxiliary connection rod T extending the rod 34 and crossing the part 35, as illustrated in Figure 7.
  • the advantage of this connection is to put the coil 9 at the same potential as the upstream electrode 6, so as to avoid breakdowns while keeping separate control of the coil and the arc as in the independent connection.
  • the spacing between the tubes 20, 21, 22 of the coil 9 is determined so as to have the desired cooling characteristics.
  • the support of the extension 24 on the part 17 is sliding and allows the free sliding of the coil 9 in its annular housing defined by the separator 15 and an annular extension 17a of the part 17, itself arranged in the extension of the inner envelope 5.
  • the device of the invention it is also possible to axially modify the relative position of the coil 9 relative to the upstream electrode 6 by replacing the rods 30 with rods of different length, or even by arranging, at the external end of the rods, a device (not shown in the drawings) ensuring a controlled axial displacement of said rods according, for example, to a determined program, the coil 9 being able, as indicated above, to slide freely between the separator 15 and part 17a.
  • the separator 15 can, during the movement of the upstream electrode 6 towards the downstream electrode 7 at the time of starting, freely slide inside the coil 9 which remains stationary.
  • the invention is obviously not limited to the embodiments shown and described above, but on the contrary covers all the variants thereof, in particular with regard to the shapes, dimensions and arrangement of the three tubular parts 20,21, 22 of the coil support, the arrangement, the number and the mounting of the windings, the coil connection means.
  • the invention applies to all types of plasma torch, non-transferred arc or transferred arc, regardless of the type of starting device used, in particular whether the upstream electrode 6 is mobile or not.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)
EP96450015A 1995-06-23 1996-06-19 Torche à plasma à bobine électromagnétique de déplacement du pied d'arc indépendante et intégrée Withdrawn EP0750451A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9507791 1995-06-23
FR9507791A FR2735941B1 (fr) 1995-06-23 1995-06-23 Torche a plasma a bobine electromagnetique de deplacement du pied d'arc independante et integree

Publications (1)

Publication Number Publication Date
EP0750451A1 true EP0750451A1 (fr) 1996-12-27

Family

ID=9480483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96450015A Withdrawn EP0750451A1 (fr) 1995-06-23 1996-06-19 Torche à plasma à bobine électromagnétique de déplacement du pied d'arc indépendante et intégrée

Country Status (6)

Country Link
US (1) US5719371A (xx)
EP (1) EP0750451A1 (xx)
JP (1) JPH09115690A (xx)
CA (1) CA2179654A1 (xx)
FR (1) FR2735941B1 (xx)
ZA (1) ZA965304B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010070051A1 (fr) * 2008-12-19 2010-06-24 Europlasma Procédé de contrôle de l'usure d'au moins une des électrodes d'une torche à plasma

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2763466B1 (fr) * 1997-05-14 1999-08-06 Aerospatiale Systeme de regulation et de pilotage d'une torche a plasma
US8852693B2 (en) 2011-05-19 2014-10-07 Liquipel Ip Llc Coated electronic devices and associated methods

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663792A (en) * 1970-03-02 1972-05-16 Westinghouse Electric Corp Apparatus and method of increasing arc voltage and gas enthalpy in a self-stabilizing arc heater
US3832519A (en) * 1972-08-11 1974-08-27 Westinghouse Electric Corp Arc heater with integral fluid and electrical ducting and quick disconnect facility
FR2609358A1 (fr) * 1987-01-07 1988-07-08 Electricite De France Torche a plasma a pied d'arc amont mobile longitudinalement et procede pour maitriser son deplacement
EP0427590A1 (fr) * 1989-11-08 1991-05-15 AEROSPATIALE Société Nationale Industrielle Torche à plasma pourvue d'une bobine électromagnétique de rotation de pieds d'arc

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4668853A (en) * 1985-10-31 1987-05-26 Westinghouse Electric Corp. Arc-heated plasma lance
US5262616A (en) * 1989-11-08 1993-11-16 Societe Nationale Industrielle Et Aerospatiale Plasma torch for noncooled injection of plasmagene gas
FR2654294B1 (fr) * 1989-11-08 1992-02-14 Aerospatiale Torche a plasma a amorcage par court-circuit.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663792A (en) * 1970-03-02 1972-05-16 Westinghouse Electric Corp Apparatus and method of increasing arc voltage and gas enthalpy in a self-stabilizing arc heater
US3832519A (en) * 1972-08-11 1974-08-27 Westinghouse Electric Corp Arc heater with integral fluid and electrical ducting and quick disconnect facility
FR2609358A1 (fr) * 1987-01-07 1988-07-08 Electricite De France Torche a plasma a pied d'arc amont mobile longitudinalement et procede pour maitriser son deplacement
EP0427590A1 (fr) * 1989-11-08 1991-05-15 AEROSPATIALE Société Nationale Industrielle Torche à plasma pourvue d'une bobine électromagnétique de rotation de pieds d'arc

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010070051A1 (fr) * 2008-12-19 2010-06-24 Europlasma Procédé de contrôle de l'usure d'au moins une des électrodes d'une torche à plasma
FR2940584A1 (fr) * 2008-12-19 2010-06-25 Europlasma Procede de controle de l'usure d'au moins une des electrodes d'une torche a plasma
US8502109B2 (en) 2008-12-19 2013-08-06 Europlasma Method of monitoring the wear of at least one of the electrodes of a plasma torch

Also Published As

Publication number Publication date
US5719371A (en) 1998-02-17
FR2735941A1 (fr) 1996-12-27
ZA965304B (en) 1997-02-26
CA2179654A1 (fr) 1996-12-24
FR2735941B1 (fr) 1997-09-19
JPH09115690A (ja) 1997-05-02

Similar Documents

Publication Publication Date Title
EP0933981A1 (fr) Ensemble tuyère/porte-tuyère pour torche à plasma
FR2831243A1 (fr) Bougie de prechauffage pour un moteur diesel et procede de fabrication associe
CA2029507C (fr) Torche a plasma a amorcage par court-circuit
EP0750451A1 (fr) Torche à plasma à bobine électromagnétique de déplacement du pied d'arc indépendante et intégrée
FR2772547A1 (fr) Ensemble corps d'electrode/porte-electrode pour torche plasma
FR2929045A1 (fr) Magnetron
EP0750450B1 (fr) Torche à plasme à structure générale sensiblement axi-symétrique
FR2532718A1 (fr) Chalumeau du type a allumage par etincelles
EP0427590B1 (fr) Torche à plasma pourvue d'une bobine électromagnétique de rotation de pieds d'arc
EP0099274B1 (fr) Transformateur, notamment abaisseur de tension pour machine à souder électrique
EP0227543A1 (fr) Vérin bi-pression
FR2810789A1 (fr) Cathode a rendement thermique optimise
FR2833423A1 (fr) Moteur electrique a collecteur equipe d'un dispositif de reduction des perturbations electromagnetiques
FR2785335A1 (fr) Dispositif d'allumage pour moteur a combustion interne
EP0438366A1 (fr) Inducteur pour un four à induction, comportant un tube parcouru par un liquide de refroidissement
WO1995030992A1 (fr) Bobine d'allumage destinee a etre montee sur une bougie pour l'alimentation electrique individuelle de cette bougie
FR2622745A1 (fr) Bougie d'allumage pour turboreacteur, a positionnement flottant
US7259348B2 (en) Welding torch having integral gas lens and collet and method of operating same
FR2718281A1 (fr) Disjoncteur à haute ou moyenne tension à bobine de soufflage.
FR3132409A1 (fr) Tuyère améliorée pour une torche de coupage plasma
FR3132411A1 (fr) Torche de coupage plasma munie d'un empilement de consommables
FR3132410A1 (fr) Tuyère aval pour une torche de coupage plasma
EP2903090A1 (fr) Conducteur électrique
EP0802600B1 (fr) Cable électrique à isolation gazeuse
EP0072764A2 (fr) Buse d'allumage pour chalumeau

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE GB IT NL SE

17P Request for examination filed

Effective date: 19970612

17Q First examination report despatched

Effective date: 19981221

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20010103