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WO2010073223A1 - Torche à plasma hautes performances - Google Patents

Torche à plasma hautes performances Download PDF

Info

Publication number
WO2010073223A1
WO2010073223A1 PCT/IB2009/055930 IB2009055930W WO2010073223A1 WO 2010073223 A1 WO2010073223 A1 WO 2010073223A1 IB 2009055930 W IB2009055930 W IB 2009055930W WO 2010073223 A1 WO2010073223 A1 WO 2010073223A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
torch
unit
nozzle
plasma
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.)
Ceased
Application number
PCT/IB2009/055930
Other languages
English (en)
Other versions
WO2010073223A4 (fr
Inventor
Silvano Dallavalle
Mauro Vancini
Vittorio Colombo
Emanuele Ghedini
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.)
Cebora SpA
Original Assignee
Cebora SpA
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 Cebora SpA filed Critical Cebora SpA
Priority to EP09818642A priority Critical patent/EP2368411A1/fr
Publication of WO2010073223A1 publication Critical patent/WO2010073223A1/fr
Publication of WO2010073223A4 publication Critical patent/WO2010073223A4/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H05H1/3442—Cathodes with inserted tip
    • 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
    • H05H1/3457—Nozzle protection devices
    • 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
    • H05H1/3484—Convergent-divergent nozzles

Definitions

  • This invention relates to a plasma cutting torch.
  • plasma cutting torches comprise:
  • a torch body which extends mainly in length and which houses a cylindrical electrode mounted centrally on the torch body; the electrode is connected by a lead to the negative pole of the power generator (cathode);
  • nozzle mounted on one end of the torch body and surrounding the tip of the electrode; the nozzle is electrically isolated from the electrode and can be connected by a second lead to the positive pole of the power generator (anode);
  • nozzle holder joined directly to the torch body and whose inside wall faces the outside wall of the nozzle in such a way as to form, together with said outside wall, a cooling chamber through which a cooling fluid passes;
  • the covering unit forms, together with the nozzle holder, a feed channel for the flow of a secondary fluid or gas.
  • the nozzle and the protective element enable the plasma to be discharged through respective coaxial holes in their proximal portions.
  • the covering unit is normally divided into two separate parts which are fitted together when the torch is assembled: - the first part is a supporting element, substantially cylindrical in shape, which, close to its distal end, can be screwed to the torch body where it is suitably isolated electrically;
  • the covering element proper consists of a second, cup- shaped element which can be coupled with the proximal end of the supporting element so as to totally cover the proximal area of the torch.
  • This second element is provided with the above mentioned central hole for the passage of the plasma arc and with a circular internal area shaped to accommodate a secondary gas ring or diffuser interposed between the second element itself and the outside surface of the nozzle holder.
  • this ring is provided with a plurality of openings distributed according to a well known pattern to enable the secondary gas to flow towards the plasma channel.
  • the flow of secondary fluid is used to prevent molten metal from entering the holes, to improve the directional accuracy of the plasma arc and to protect the arc itself from the atmosphere.
  • the prior art has proposed plasma torches comprising a nozzle fitted at the proximal end of the torch and surrounding the electrode in such a way as to form a channel for the passage of the plasma gas, a nozzle holder for supporting the nozzle and a shield for protecting the nozzle.
  • the shield is fixed to the nozzle with an interposed insulating ring and forms a single part with the nozzle.
  • the outside of the nozzle and shield assembly is surrounded by the above mentioned nozzle holder.
  • the nozzle holder is designed to support the above mentioned components in such a way that they can be separated from the torch body.
  • the shield is supported by the nozzle holder by means of a flange that abuts a part of the nozzle holder shaped to match it.
  • This type of torch also comprises a cooling water passage formed by the inside wall of the nozzle holder and the outside surface of the nozzle.
  • the flanged portion of the shield faces this channel: in other words, the channel is delimited by the nozzle holder and nozzle and ends at the flange of the shield abutting the nozzle holder.
  • the operating components of the torch shield, nozzle, nozzle holder
  • the parts most subject to wear during torch operation are effectively cooled only as long as the torch is used to cut materials of limited thickness, that is to say, up to limited torch operating power levels.
  • This invention therefore has for an aim to provide a plasma cutting torch that can cut very thick material and at the same time can guarantee effective protection of its covering unit and a high level of cooling of the components, thereby increasing the working life of the components themselves and of the torch.
  • FIG. 1 is a schematic cross section, with some parts cut away in order to better illustrate others, of a plasma cutting torch according to the invention
  • Figure 2 shows an enlarged detail from Figure 1 ;
  • - Figure 3 is a schematic cross section of the torch according to the invention
  • - Figure 4 is a cross section of the torch according to the invention through the line IV-IV of Figure 3.
  • the plasma torch according to the invention labelled 1 in its entirety, is used for cutting metals.
  • the torch 1 consists of a torch body 2 which extends mainly in length along an axis X and comprises: an electrode 3; a nozzle 4; a nozzle support or holder 5, a first unit 6 for covering the nozzle 4 and the nozzle holder 5 and a second unit 7 for partly covering the first unit 6.
  • the electrode 3 is mounted centrally in the torch body 2 and can be connected to the negative pole of a power generator (not illustrated).
  • proximal end denotes the end portion of each torch 1 component closest to the point O shown in Figures 1 and 2.
  • distal end denotes the end portion of each torch 1 component furthest from the point O, that is to say, the end opposite the proximal end.
  • the nozzle 4 is mounted on the proximal end of the torch body 2.
  • the nozzle 4 can be connected to the positive pole of the generator to define an anode. Further, the nozzle 4 surrounds the tip of the electrode 3 to form a chamber
  • the nozzle 4 has a first central through hole 9 for the passage of the plasma.
  • the nozzle holder 5 is associated with the torch body 2, and its truncated cone shaped inside surface 5a faces the truncated cone shaped outside surface 4a of the nozzle 4 in such a way as to form a first chamber 10 through which a cooling fluid flows in order to cool the nozzle 4 and the nozzle holder 5.
  • the first chamber 10 is in fluid communication with a cooling water supply conduit 11 connected to water supply means of known type and therefore not illustrated.
  • the above mentioned first unit 6 for covering the nozzle 4 and nozzle holder 5 comprises: - a first supporting element 12 which is substantially cylindrical in shape. Close to its distal end, the first element 12 can be associated with the torch body 2 by screwing and is electrically isolated by a suitable isolating ring 13.
  • a second, cup-shaped element 14 which at least partly matches the profile of the nozzle 4 and nozzle holder 5.
  • the annular edge 15 of the second element 14 can be associated with the proximal end (tapered) of the first supporting element 12.
  • the second element 14 is provided with a second central hole 16, coaxial with the first hole 9, to allow the passage of the plasma arc: thus, the second element 14 constitutes the part that actually covers and protects the front of the torch 1.
  • the covering unit 6 also forms a channel 17 through which a second cooling fluid F2 (indicated by the arrows F2, Figure 2) flows between the nozzle holder 5 and the covering unit 6 to reach the second hole 16: this secondary fluid
  • F2 (which may be air - or other fluid/gas) further cools the area close to the nozzle holder 5 and nozzle 4 and is discharged through the second hole 16.
  • a second chamber 18 for the passage of the cooling liquid.
  • the second chamber 18 for the passage of the cooling liquid is in fluid communication with the first chamber 10 and is mounted in series with the first chamber 10 in such a way that the liquid flow rate through both chambers is the same.
  • first chamber 10 there is an interposed chamber 19 for accumulating cooling water.
  • the accumulation chamber 19 is divided into two semicircular portions, namely, a first portion 20 and a second portion 21.
  • the two semicircular portions 20, 21 of the accumulation chamber 19 are separated by a pair of partitions 22 located in diametrically opposite positions inside the accumulation chamber 19.
  • the first portion 20 of the accumulation chamber 19 is in fluid communication, through a channel 23, with the first chamber 10 for the passage of water.
  • the first portion 20 of the accumulation chamber 19 is in fluid communication, through a channel 24, with the second chamber 18 for the passage of water.
  • the second semicircular portion 21 of the accumulation chamber 19 is in fluid communication, through a respective channel 25, with the second chamber 18.
  • the second portion 21 of the semicircular chamber 19 is in fluid communication, through a hole 26, with a cooling water outlet conduit 27 connected to the above mentioned supply means.
  • the first element 12 comprises a first member 28 and a second member 29.
  • first member 28 and the second 29 are concentric and each has a first portion 28a, 29a that is cylindrical, and second portion 28b, 29b that is tapered in the direction of the proximal end of the torch.
  • the first member 28 and the second member 29 are associated with each other in such a way that the outside surface 30 of the first member 28 faces the inside surface 31 of the second member 29.
  • the two surfaces 30, 31 define and delimit a first zone 32 of the above mentioned second chamber 18 for the passage of the cooling water.
  • the second element 14 also comprises a first member 33 and a second member 34.
  • first member 33 and the second 34 are concentric and are tapered in the direction of the proximal end of the torch 1.
  • the first member 33 and the second member 34 are associated with each other in such a way that the outside surface 35 of the first member 33 faces the inside surface 36 of the second member 34.
  • the two surfaces 35, 36 define and delimit a second zone 37 of the above mentioned second chamber 18 for the passage of the cooling water.
  • the partitions 38 are co-planar with the partitions 22, so as to allow the cooling liquid to flow in optimum manner from the first semicircular portion 20 of the chamber 19 to the second portion 21 through the second chamber 18.
  • the partitions 38 terminate at the end of the first zone 32 of the second chamber 18.
  • the above mentioned second unit 7 for partly covering the first unit 6 may be associated with the torch body 2 or with the first element 12, and forms, together with the outside surface of the first unit 6 facing the second unit 7, a second channel 39 for the passage of a third fluid F3 (for example air or other fluid/gas) leading in the direction of the second hole 16 and designed to permit cooling at least of the outside of the first unit 6 (as indicated by the arrows F3).
  • the second unit 7 has a cylindrical shape, tapering inwards at its proximal end in such a way as to substantially match a part of the first unit 6.
  • the second unit 7 is associated indirectly, in the embodiment illustrated by way of example, with the torch body 2 at its distal end.
  • the distal end of the second unit 7 may be fastened by screwing to (or permanently associated with) an outside portion of the distal end of the first element 12, and both may then be fastened to the torch body 2 through a supporting member 100, illustrated in Figure 1, screwed to the torch body.
  • the second unit 7 has openings 40 made in it at the second element 14 of the first unit 6 in such a way as to allow the third fluid F3 to flow out in the direction of the second element 14 itself, allowing the outside of the latter to be cooled.
  • the cooling water supply means are activated at the same time as the torch starts piercing and cutting a material.
  • the water flows along the conduit 11 until it reaches the first chamber 10.
  • the cooling water comes into contact with the entire truncated-cone shaped inside surface 5a of the nozzle holder 5 and with the entire truncated-cone shaped outside surface 4a of the nozzle. From the first chamber 10, the cooling water flows along the channel 23 and enters the first semicircular portion 20 of the accumulation chamber 19.
  • the water proceeds through the channel 24 until it reaches the first zone 32 of the second chamber 18.
  • the first zone 32 of the second chamber 18 contains the above mentioned partitions 38: that way, the water in the first zone 32 of the second chamber 18 flows only in half of the second chamber 18.
  • the water fills the second zone 37 of the second chamber 18, coming into full contact with the entire outside surface 35 of the first member 33 and with the entire inside surface 36 of the second member 34, allowing a high level of heat exchange.
  • the water flows out of the second chamber 18 through the channel 25 and enters the second semicircular portion 21 of the accumulation chamber 19.
  • the flow of the water along the path described is repeated for the entire duration of the piercing and cutting operations performed by the torch.
  • the first chamber allows the water to come into contact and hence exchange heat with the entire outside surface of the nozzle and with the entire inside surface of the nozzle holder.
  • the second chamber is dedicated exclusively to cooling the second unit.
  • the water comes into contact with the entire inside surface of the second member of the second element and with the entire outside surface of the first member of the second element. Thanks to the large heat exchange surface, the operating components of the torch receive a high degree of cooling and it is therefore possible to allow the torch to operate even at very high power levels in order to pierce materials of considerable thicknesses without reducing the efficiency and working of the torch components.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Arc Welding In General (AREA)
  • Plasma Technology (AREA)

Abstract

On décrit une torche de découpe à plasma comportant : un corps (2) de torche ; une électrode (3) montée dans le corps (2) de torche ; une buse(4) montée sur l'extrémité proximale du corps (2) de torche, entourant le bout de l'électrode (3) pour former une chambre (8) où un plasma est généré en y introduisant un premier fluide (Fl), et dotée d'un premier trou débouchant central (9) destiné au passage du plasma ; un porte-buse ou support (5) dont la paroi intérieure fait face à la paroi extérieure de la buse (4) de manière à former une première chambre (10) à travers laquelle s'écoule un fluide de refroidissement ; une première unité (6) servant à recouvrir et à protéger la buse (4) et le support (5) de buse ; un conduit (17) à travers lequel un deuxième fluide (F2) s'écoule en direction d'un deuxième trou (16) ; la torche comporte également une deuxième chambre (18) destinée au passage d'un liquide de refroidissement.
PCT/IB2009/055930 2008-12-24 2009-12-23 Torche à plasma hautes performances Ceased WO2010073223A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09818642A EP2368411A1 (fr) 2008-12-24 2009-12-23 Torche à plasma hautes performances

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO2008A000779 2008-12-24
ITBO2008A000779A IT1392379B1 (it) 2008-12-24 2008-12-24 Torcia al plasma ad elevate prestazioni.

Publications (2)

Publication Number Publication Date
WO2010073223A1 true WO2010073223A1 (fr) 2010-07-01
WO2010073223A4 WO2010073223A4 (fr) 2010-10-21

Family

ID=41278747

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/055930 Ceased WO2010073223A1 (fr) 2008-12-24 2009-12-23 Torche à plasma hautes performances

Country Status (3)

Country Link
EP (1) EP2368411A1 (fr)
IT (1) IT1392379B1 (fr)
WO (1) WO2010073223A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011018070A1 (fr) * 2009-08-11 2011-02-17 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Capot de protection de buse et porte-capot de protection de buse ainsi que torche à plasma équipée de l'un et/ou de l'autre
ITBO20120375A1 (it) * 2012-07-11 2014-01-12 Tec Mo S R L Dispositivo a torcia al plasma raffreddato
CN108127236A (zh) * 2018-02-05 2018-06-08 常州九圣焊割设备有限公司 高效散热式等离子弧割炬
US11889611B2 (en) 2020-12-15 2024-01-30 Lincoln Global, Inc. Plasma arc torch and cutting system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564740A (en) * 1978-01-09 1986-01-14 Institut Elektrosvarki Imeni E. O. Patona Akademii Nauk Ukrainskoi Ssr Method of generating plasma in a plasma-arc torch and an arrangement for effecting same
DE4030541A1 (de) * 1990-09-27 1992-04-09 Dilthey Ulrich Prof Dr Ing Brenner zur beschichtung von grundwerkstoffen mit pulverfoermigen zusatzwerkstoffen
US5206481A (en) * 1990-07-11 1993-04-27 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Plasma burner for transferred electric arc
US5340961A (en) * 1990-07-11 1994-08-23 Mannesmann Ag Plasma torch for transmitted arcs
US5362939A (en) * 1993-12-01 1994-11-08 Fluidyne Engineering Corporation Convertible plasma arc torch and method of use
WO2008062300A1 (fr) * 2006-11-22 2008-05-29 Cebora S.P.A. Chalumeau à plasma

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564740A (en) * 1978-01-09 1986-01-14 Institut Elektrosvarki Imeni E. O. Patona Akademii Nauk Ukrainskoi Ssr Method of generating plasma in a plasma-arc torch and an arrangement for effecting same
US5206481A (en) * 1990-07-11 1993-04-27 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Plasma burner for transferred electric arc
US5340961A (en) * 1990-07-11 1994-08-23 Mannesmann Ag Plasma torch for transmitted arcs
DE4030541A1 (de) * 1990-09-27 1992-04-09 Dilthey Ulrich Prof Dr Ing Brenner zur beschichtung von grundwerkstoffen mit pulverfoermigen zusatzwerkstoffen
US5362939A (en) * 1993-12-01 1994-11-08 Fluidyne Engineering Corporation Convertible plasma arc torch and method of use
WO2008062300A1 (fr) * 2006-11-22 2008-05-29 Cebora S.P.A. Chalumeau à plasma

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011018070A1 (fr) * 2009-08-11 2011-02-17 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Capot de protection de buse et porte-capot de protection de buse ainsi que torche à plasma équipée de l'un et/ou de l'autre
US8921731B2 (en) 2009-08-11 2014-12-30 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Protective nozzle cap, protective nozzle cap retainer, and arc plasma torch having said protective nozzle cap and or said protective nozzle cap retainer
ITBO20120375A1 (it) * 2012-07-11 2014-01-12 Tec Mo S R L Dispositivo a torcia al plasma raffreddato
CN108127236A (zh) * 2018-02-05 2018-06-08 常州九圣焊割设备有限公司 高效散热式等离子弧割炬
US11889611B2 (en) 2020-12-15 2024-01-30 Lincoln Global, Inc. Plasma arc torch and cutting system

Also Published As

Publication number Publication date
WO2010073223A4 (fr) 2010-10-21
IT1392379B1 (it) 2012-03-02
EP2368411A1 (fr) 2011-09-28
ITBO20080779A1 (it) 2010-06-25

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