EP2829162A1 - Plasmaelektrode für einen plasma-lichtbogenbrenner mit auswechselbarer elektrodenspitze - Google Patents
Plasmaelektrode für einen plasma-lichtbogenbrenner mit auswechselbarer elektrodenspitzeInfo
- Publication number
- EP2829162A1 EP2829162A1 EP13714852.4A EP13714852A EP2829162A1 EP 2829162 A1 EP2829162 A1 EP 2829162A1 EP 13714852 A EP13714852 A EP 13714852A EP 2829162 A1 EP2829162 A1 EP 2829162A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- plasma
- tip
- electrode tip
- plasma electrode
- 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.)
- Granted
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
- H05H1/32—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
- H05H1/28—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
- H05H1/3423—Connecting means, e.g. electrical connecting means or fluid connections
-
- 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 invention relates to a plasma electrode for a plasma arc torch, comprising an electrode body having at least one electrode core arranged on the electrode tip.
- Such plasma electrodes for use in plasma arc torches have become known in various embodiments.
- EP 2 408 274 A2 JP 2007-180028 A or EP 1 765 046 B1 or DE000069937323T2.
- the wear of the plasma electrode during operation is considerable.
- the electrode core inserted into the front side of the plasma electrode in the region of the electrode tip in a bore generates a plasma arc at temperatures in the range between 1,000 to 2,000 degrees Celsius and consists of an electrically conductive, highly emissive material, e.g. Hafnium or zirconium.
- the electrode tip is heavily stressed by the high firing temperatures.
- material erosion occurs on the electrode core which deposit as splashes of material on the electrode tip and its surroundings, which leads to undesirable wear and a limitation of the service life.
- EP 1 633 172 A2 proposes that the electrode core, which consists of a hafnium material, in an insert made of silver on the
- CONFIRMATION COPY Hold electrode tip This insert part (see FIG. 7) is soldered into the front region of the electrode tip.
- the invention is therefore based on the object, a plasma electrode for a plasma arc burner of the type mentioned in such a way that a more easy and cost-effective replacement of the electrode is possible during wear.
- the invention is characterized by the technical teaching of claim 1.
- the invention is based on the assumption that the electrode consisting of a high-grade material (eg AG) has at least two parts and only the front, exchangeable tip part consists of a high-quality material (such as AG), whereas the rear electrode part consists of one less high quality material, such as Cu or a Cu alloy or a comparable material may exist.
- a high-grade material eg AG
- the front, exchangeable tip part consists of a high-quality material (such as AG)
- the rear electrode part consists of one less high quality material, such as Cu or a Cu alloy or a comparable material may exist.
- the division of the electrode according to the invention is particularly useful for electrodes from a total length of more than 10-12 mm.
- the division into two is such that the replaceable tip has a length of, for example, 6 mm, while the remaining, rear electrode part makes up the remaining length.
- a bipartition is especially for longer electrodes with a total length of eg 40 mm or more.
- it makes sense to form the exchangeable tip with a length of 10 mm, while the remaining length of the electrode part may consist of a less noble material.
- the plasma electrode is formed at least in two parts and at least consists of the front electrode tip and a rear electrode part and that the electrode tip is replaceably held on the electrode part.
- the invention provides for a multi-part plasma electrode, wherein the simpler description is assumed in the following description of only two parts of this plasma electrode, although the plasma electrode may also consist of more than two parts.
- the description of a bipartite plasma electrode is therefore not intended to limit the scope of the invention.
- An essential feature of the invention is that in a two-part design of the plasma electrode is now possible to solve the front part of the rear part, because these two parts are preferably releasably connected to each other.
- the front electrode tip can be removed with the electrode core introduced there from the rear electrode portion of the plasma electrode, provided that wear on the electrode tip occurs.
- the detachable connection between the two parts of the plasma electrode is designed as a screw connection, as a plug-in connection or as a combined screw-type connector.
- the screw consists of two interlocking threads.
- At the electrode tip can be an internal thread be arranged, which can be screwed into an associated external thread in the region of the rear electrode portion of the plasma electrode.
- the electrode tip has an external thread which can be screwed onto an associated internal thread of the rear electrode part of the plasma electrode.
- a plug connection is used, such.
- a bayonet connector that can be solved and fixed by a rotary-plug movement.
- the detachable connection between the two parts of the plasma electrode consists of a sealed flange, wherein two oppositely disposed flanges on the two parts associated with each other and are liquid-tightly sealed from each other.
- a flange connection is secured by a union nut in conjunction with a thread on the opposite part.
- clamping connections are also provided.
- Such a clamp connection is z.
- the rear electrode portion of the plasma electrode is made of inexpensive copper material or copper alloy, while the front portion of the electrode tip subjected to wear is made of a silver material or a silver alloy.
- the electrode tip is made of high-quality silver or a silver alloy.
- the use of silver as a highly conductive material has been given by way of example only. Of course, other highly conductive, readily processable materials can be used which have the properties of silver. In particular tin alloys come into consideration or copper-tin alloys (bronze).
- the abovementioned materials can be used in the same abovementioned material pairings as have been specified above using the example of the material Ag.
- the invention is not limited to hollow cylindrical plasma electrodes, in the interior of which a cooling tube is arranged, with which a cooling medium - preferably water - introduced into the interior of the plasma electrode, is diverted at the front end, in the vicinity of the electrode tip, and then out again the plasma electrode is led out.
- a cooling medium - preferably water - introduced into the interior of the plasma electrode is diverted at the front end, in the vicinity of the electrode tip, and then out again the plasma electrode is led out.
- the function of such a water-cooled plasma electrode results from one of the aforementioned publications.
- the invention also claims uncooled hollow cylindrical or also consisting of solid material plasma electrodes, which are at least two parts and the front part subject to wear is easily detachably connected to the rear part.
- Figure 1 section through a first embodiment of a two-part ⁇
- FIG. 2 shows a detail section through the screw connection according to FIG. 1
- FIG. 3 shows a section through the plasma electrode according to FIG. 1
- FIG 4 the screw according to Figure 2 in
- Figure 5 section through a second embodiment of a
- Figure 7 the plasma electrode of Figure 5 in the disassembled state
- FIG 8 the threaded screw connection of Figure 7 in detail
- FIG. 9 shows a third embodiment of a plasma electrode in FIG.
- FIG. 0 shows a detail of the threaded screw connection according to FIG. 9 in FIG
- FIG. 11 shows the plasma electrode according to FIG. 9 in the assembled state
- FIG. 12 shows the threaded screw connection according to FIG. 10 in the screwed-in state
- FIG. 13 shows a plasma arc burner according to the prior art according to DE000069937323T2.
- FIG. 14 Plasma arc burner according to the prior art according to EP 1 765 046 B1.
- plasma electrode 1 is constructed in two parts and consists of the front, replaceable electrode tip 2 and a rear electrode part 3, which is centered with a radially outer mounting flange 7 on the inside of a fastening body (electrode holder) not shown in detail Incidentally, with a thread 8 can be screwed into such a fastening body.
- the entire plasma electrode 1 can be inserted sealed in a fastening body, not shown.
- a cooling tube 6 is arranged centrally, which engages with its front end in a receiving space 5 in the region of the electrode tip 2.
- An electrode core 4 is inserted in a bore of the electrode tip 2 is made of a highly-emissive material, such. A hafnium or zirconium material.
- the cooling of the plasma electrode takes place in such a way that a coolant flow is introduced into the interior 10 of the cooling tube 6, which is deflected in the region of the receiving space 5 in the electrode tip 2 and is then recirculated via the radially outer inner bore 9.
- the connecting portion 11 of the detachable connection consists of a screw thread.
- a screw thread 12 is formed.
- opposing and rectified conical surfaces 13, 14 are arranged on associated flanges of the electrode tip 2 and the electrode member 3 and that further engages a preferably encircling annular flange 5 on the electrode member 3 in an associated annular groove 16 and there centered.
- the horizontal projections 17, 18 can lie sealingly on one another. In this area, additional sealing such. B. a sealing ring 19 may be arranged.
- FIG. 3 shows the assembled structure of the plasma electrode shown in the disassembled state in FIG. 1, where it can be seen that the front, exchangeable electrode tip 2 has a relatively short length 24 which is many times shorter than comparatively the non-replaceable electrode part 3 with a much longer length 25.
- the aspect ratios of these two lengths 24, 25 can range from 1: 1 to 1: 6.
- the electrode tip 2 is easily detachably mounted on the electrode-side electrode part 3 and therefore is easily replaceable when it is worn. It is kept short to keep material consumption low during replacement.
- FIGS. 5 to 8 show the kinematic reversal of a screw thread represented by numeral 12 in FIGS. 1 to 4.
- the screw thread 12 from a on the inside of the electrode tip. 2 arranged internal thread, which is screwed into an associated, radially outwardly directed external thread on the electrode part 3.
- the threaded screw connection is sealed by a sealing ring 19 liquid-tight.
- FIGS. 7 and 8 show another embodiment of the screw connection, and moreover, in the area of the electrode tip 2, a key surface 20 can also be provided for the engagement of a suitable tool with which the electrode tip 2 can be unscrewed from the electrode part 3.
- an external thread is arranged on the rear side of the electrode tip 2, which cooperates with an internal thread in the interior of the electrode member 3 and the entire threaded connection is sealed liquid-tight by a sealing ring 19 which is inserted in an associated annular groove 23 on the vertical flange of the electrode tip 2 ,
- the external thread 21 on the electrode tip 2 thus cooperates with the internal thread 22 on the electrode part 3 as a screw thread 12.
- FIGS. 9 to 12 show, as a further exemplary embodiment, a plasma electrode in which the sealing ring 19 is integrally formed in the electrode part 3 in the region of an outwardly open annular groove 23 at the foot of the vertical flange.
- the electrode tip 2 has an internal thread 22, which with the associated external thread 21 results in the sealed screw connection in the region of the connection part 11.
- Figures 11 and 12 show the Gewindeschraubtress shown in Figures 9 to 10 in the screwed state.
- Fig. 13 shows the prior art of DE000069937323T2 and Figure 2 of this document shows a screwed into a holder electrode 16, which is integrally formed and must be replaced when worn as an entire part.
- the electrode 16 is screwed with an upper screw thread 19 in a holder.
- the invention is now compared to this prior art is to form the known electrode 16 in two parts and form the front tip as easily replaceable electrode tip 2 and the rear part of the electrode 16 as an electrode part of the electrode body of the plasma electrode.
- the subdivision would be according to the invention in the amount of the lowest edge of the electrode 16 shown in Figure 2 of this document.
- the adjoining the hexagon, the lower portion of the electrode is thus formed replaceable according to the invention and forms a removably held there, replaceable electrode tip. This is indicated by the dashed line a.
- Another possibility is the separation of the two electrode parts according to the upper line b.
- FIG. 14 shows a replaceable, one-piece electrode 2 of considerable length, which in principle corresponds to the embodiment of the electrode according to the invention.
- the matching features are the upper thread and two annular grooves, in each of which an O-ring is inserted in order to screw the electrode sealed in an electrode holder can.
- the invention now provides that the electrode shown in FIG. 14 is subdivided at the lowest point-approximately at the level of the reference numeral 3 -and forms the replaceable electrode tip there.
- the electrode tip thus formed only needs to be formed so long that the mounting surfaces to be arranged there and the electrode core can be arranged.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Plasma Technology (AREA)
- Arc Welding In General (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13714852.4A EP2829162B1 (de) | 2012-03-23 | 2013-03-22 | Plasmaelektrode für einen plasma-lichtbogenbrenner mit auswechselbarer elektrodenspitze |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12002077.1A EP2642832A1 (de) | 2012-03-23 | 2012-03-23 | Plasma-Elektrode für einen Plasmalichtbogenbrenner mit auswechselbarer Elektrodenspitze |
EP13714852.4A EP2829162B1 (de) | 2012-03-23 | 2013-03-22 | Plasmaelektrode für einen plasma-lichtbogenbrenner mit auswechselbarer elektrodenspitze |
PCT/EP2013/000876 WO2013139484A1 (de) | 2012-03-23 | 2013-03-22 | Plasmaelektrode für einen plasma-lichtbogenbrenner mit auswechselbarer elektrodenspitze |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2829162A1 true EP2829162A1 (de) | 2015-01-28 |
EP2829162B1 EP2829162B1 (de) | 2017-05-17 |
Family
ID=48050654
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12002077.1A Withdrawn EP2642832A1 (de) | 2012-03-23 | 2012-03-23 | Plasma-Elektrode für einen Plasmalichtbogenbrenner mit auswechselbarer Elektrodenspitze |
EP13714852.4A Active EP2829162B1 (de) | 2012-03-23 | 2013-03-22 | Plasmaelektrode für einen plasma-lichtbogenbrenner mit auswechselbarer elektrodenspitze |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12002077.1A Withdrawn EP2642832A1 (de) | 2012-03-23 | 2012-03-23 | Plasma-Elektrode für einen Plasmalichtbogenbrenner mit auswechselbarer Elektrodenspitze |
Country Status (3)
Country | Link |
---|---|
US (1) | US9736916B2 (de) |
EP (2) | EP2642832A1 (de) |
WO (1) | WO2013139484A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109079294B (zh) * | 2018-10-31 | 2023-08-11 | 浙江巨化装备制造有限公司 | 全自动管板焊机枪头连续自动钨棒更换装置及更换方法 |
EP3949695A1 (de) * | 2019-04-04 | 2022-02-09 | Hypertherm, INC. | Verbrauchsmaterial mit einstellbarer länge für einen flüssigkeitsgekühlten plasmalichtbogenbrenner |
CZ308703B6 (cs) * | 2020-02-05 | 2021-03-03 | B&Bartoni, spol. s r.o. | Sestava elektrody pro plazmový obloukový hořák se zlepšeným přenosem elektrického proudu |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5216221A (en) * | 1992-01-17 | 1993-06-01 | Esab Welding Products, Inc. | Plasma arc torch power disabling mechanism |
US5440094A (en) * | 1994-04-07 | 1995-08-08 | Douglas G. Carroll | Plasma arc torch with removable anode ring |
US6020572A (en) | 1998-08-12 | 2000-02-01 | The Esab Group, Inc. | Electrode for plasma arc torch and method of making same |
US6498316B1 (en) * | 1999-10-25 | 2002-12-24 | Thermal Dynamics Corporation | Plasma torch and method for underwater cutting |
US7081597B2 (en) | 2004-09-03 | 2006-07-25 | The Esab Group, Inc. | Electrode and electrode holder with threaded connection |
US8101882B2 (en) | 2005-09-07 | 2012-01-24 | Hypertherm, Inc. | Plasma torch electrode with improved insert configurations |
US7256366B2 (en) | 2005-12-21 | 2007-08-14 | The Esab Group, Inc. | Plasma arc torch, and methods of assembling and disassembling a plasma arc torch |
US9662747B2 (en) * | 2006-09-13 | 2017-05-30 | Hypertherm, Inc. | Composite consumables for a plasma arc torch |
DE102008062731C5 (de) * | 2008-12-18 | 2012-06-14 | Kjellberg Finsterwalde Plasma Und Maschinen Gmbh | Elektrode für einen Plasmabrenner |
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 |
US8884179B2 (en) | 2010-07-16 | 2014-11-11 | Hypertherm, Inc. | Torch flow regulation using nozzle features |
US9211603B2 (en) * | 2012-01-31 | 2015-12-15 | The Esab Group, Inc. | Plasma gouging torch and angled nozzle therefor |
-
2012
- 2012-03-23 EP EP12002077.1A patent/EP2642832A1/de not_active Withdrawn
-
2013
- 2013-03-22 EP EP13714852.4A patent/EP2829162B1/de active Active
- 2013-03-22 WO PCT/EP2013/000876 patent/WO2013139484A1/de active Application Filing
- 2013-03-22 US US14/361,903 patent/US9736916B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2013139484A4 (de) | 2013-11-21 |
US9736916B2 (en) | 2017-08-15 |
EP2642832A1 (de) | 2013-09-25 |
EP2829162B1 (de) | 2017-05-17 |
US20140291303A1 (en) | 2014-10-02 |
WO2013139484A1 (de) | 2013-09-26 |
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