EP2642832A1 - Plasma electrode for a plasma arc torch with exchangeable electrode tip - Google Patents
Plasma electrode for a plasma arc torch with exchangeable electrode tip Download PDFInfo
- Publication number
- EP2642832A1 EP2642832A1 EP12002077.1A EP12002077A EP2642832A1 EP 2642832 A1 EP2642832 A1 EP 2642832A1 EP 12002077 A EP12002077 A EP 12002077A EP 2642832 A1 EP2642832 A1 EP 2642832A1
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- European Patent Office
- Prior art keywords
- electrode
- plasma
- plasma electrode
- electrode tip
- tip
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- 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 burner, comprising an electrode body which has 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.
- the JP 2007-180028 A or the EP 1 765 046 B1 directed.
- the wear of the plasma electrode during operation is considerable.
- the electrode core inserted into the front of the plasma electrode in the region of the electrode tip in a bore produces the plasma arc at temperatures in the range between 1000 to 2000 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.
- the EP 1 633 172 A2 Proposes to keep the electrode core, which consists of a hafnium material, in a silver insert on the electrode tip. This insert (see FIG. 7 ) is soldered into the front area 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 plasma electrode is formed at least in two parts and at least consists of the front electrode tip and a rear fastening part and that the electrode tip is replaceably held on the fastening part.
- the invention provides for a multi-part plasma electrode, wherein the simpler description is based in the following description of only two parts of this plasma electrode, although the plasma electrode can 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 inserted there from the rear attachment part 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.
- an internal thread can be arranged, which can be screwed into an associated external thread in the region of the rear attachment part of the plasma electrode.
- the electrode tip has an external thread which can be screwed onto an associated internal thread of the rear attachment 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 connection with a thread on the opposite part.
- clamping connections are also provided.
- Such a clamp connection is z. B. a flange, with two sealingly opposite and abutting flanges, of a Eccentric clamping ring to be held sealingly on mutual contact pressure.
- the rear fixing part of the plasma electrode is made of a low-cost copper material or a copper alloy
- the front part of the electrode tip, which is subject 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.
- 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 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.
- plasma electrode 1 is constructed in two parts and consists of the front, replaceable electrode tip 2 and a rear attachment part 3, which is centered with a radially outer mounting flange 7 on the inside of an electrode body not shown in detail and with a thread 8 in a more such electrode body can be screwed.
- the entire plasma electrode 1 can also be plugged sealed into an electrode 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 introduced from a highly-emissive material, such as. 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.
- connection portion 11 of the detachable connection consists of a screw thread.
- the electrode tip 2 on a vertical flange on an external thread which in an associated internal thread a likewise integrally formed on the fastening part 3 flange attacks.
- 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 fastening part 3 and that further engages a preferably encircling annular flange 15 on the fastening part 3 in an associated annular groove 16 and there centered.
- FIG. 3 shows the composite structure of in FIG. 1 in the disassembled state shown plasma electrode, where it can be seen that the front, replaceable electrode tip 2 has a relatively short length 24 which is many times shorter than comparatively the non-replaceable attachment member 3 with a much greater length 25th
- 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 fixing 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 numeral 12 in the FIGS. 1 to 4 shown screw thread.
- the screw thread 12 consists of a arranged on the inside of the electrode tip 2 internal thread, which is screwed into an associated, radially outwardly directed external thread on the mounting 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, and the rest, that in the area of the electrode tip 2 also a key surface 20 may be provided for the attack of a suitable tool with which the electrode tip 2 can be unscrewed from the mounting 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 fastening part 3 and the entire threaded screw 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 fastening part 3 as a screw thread 12.
- FIGS. 9 to 12 show as a further embodiment, a plasma electrode in which the sealing ring 19 is integrally formed in the region of an outwardly open annular groove 23 at the foot of the vertical flange in the fastening part 3.
- 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.
- FIGS. 11 and 12 show the in FIGS. 9 to 10 Threaded connection shown in the screwed state.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Plasma Technology (AREA)
- Arc Welding In General (AREA)
Abstract
Description
Die Erfindung betrifft eine Plasma-Elektrode für einen Plasma-Lichtbogenbrenner, bestehend aus einem Elektrodenkörper, der mindestens einen an der Elektrodenspitze angeordneten Elektrodenkern aufweist.The invention relates to a plasma electrode for a plasma arc burner, comprising an electrode body which has at least one electrode core arranged on the electrode tip.
Derartige Plasmaelektroden für die Verwendung bei Plasma-Lichtbogenbrenner sind in vielfältigen Ausführungsformen bekannt geworden.Such plasma electrodes for use in plasma arc torches have become known in various embodiments.
Als Beispiel wird auf die
Hinsichtlich der Funktion und des Aufbaus eines Plasma-Lichtbogenbrenners wird auf die letztgenannte Druckschrift
Der Verschleiß der Plasmaelektrode während des Betriebs ist beträchtlich. Der in die Vorderseite der Plasmaelektrode im Bereich der Elektrodenspitze in einer Bohrung eingesetzte Elektrodenkern erzeugt den Plasma-Lichtbogen bei Temperaturen im Bereich zwischen 1.000 bis 2.000 Grad Celsius und besteht aus einem elektrisch leitfähigen, hoch-emissiven Material, z.B. Hafnium oder Zirkonium. Die Elektrodenspitze wird durch die hohen Brenntemperaturen stark beansprucht. Darüber hinaus entstehen Materialabtragungen am Elektrodenkern die sich als Materialspritzer auf der Elektrodenspitze und deren Umgebung ablagern, was zu einem unerwünschten Verschleiß und einer Begrenzung der Lebensdauer führt.The wear of the plasma electrode during operation is considerable. The electrode core inserted into the front of the plasma electrode in the region of the electrode tip in a bore produces the plasma arc at temperatures in the range between 1000 to 2000 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. In addition, 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.
Die
Es ist deshalb nicht möglich, die Elektrodenspitze als separates Teil auszutauschen. Vielmehr muss bei Verschleiß die gesamte Elektrode ausgetauscht werden, was mit hohen Kosten verbunden ist.It is therefore not possible to replace the electrode tip as a separate part. Rather, the entire electrode must be replaced when worn, which is associated with high costs.
Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Plasma-Elektrode für einen Plasma-Lichtbogenbrenner der eingangs genannten Art so weiterzubilden, dass ein leichter und kostengünstiger Austausch der Elektrode bei Verschleiß möglich ist.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.
Zur Lösung der gestellten Aufgabe ist die Erfindung durch die technische Lehre des Anspruches 1 gekennzeichnet.To solve the problem, the invention is characterized by the technical teaching of claim 1.
Wesentliches Merkmal der Erfindung ist, dass die Plasma-Elektrode mindestens zweiteilig ausgebildet ist und mindestens aus der vorderen Elektrodenspitze und einem hinteren Befestigungsteil besteht und dass die Elektrodenspitze auswechselbar am Befestigungsteil gehalten ist.An essential feature of the invention is that the plasma electrode is formed at least in two parts and at least consists of the front electrode tip and a rear fastening part and that the electrode tip is replaceably held on the fastening part.
Die Erfindung sieht also eine mehrteilige Plasma-Elektrode vor, wobei der einfacheren Beschreibung wegen in der folgenden Beschreibung lediglich von zwei Teilen dieser Plasma-Elektrode ausgegangen wird, obwohl die Plasma-Elektrode auch aus mehr als zwei Teilen bestehen kann. Die Beschreibung einer zweiteiligen Plasmaelektrode soll deshalb den Schutzumfang der Erfindung nicht beschränken.Thus, the invention provides for a multi-part plasma electrode, wherein the simpler description is based in the following description of only two parts of this plasma electrode, although the plasma electrode can 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.
Wesentliches Merkmal der Erfindung ist, dass bei einer zweiteiligen Ausbildung der Plasma-Elektrode nunmehr die Möglichkeit besteht, den vorderen Teil vom hinteren Teil zu lösen, weil diese beiden Teile bevorzugt lösbar miteinander verbunden sind.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.
Auf diese Weise kann die vordere Elektrodenspitze mit dem dort eingebrachten Elektrodenkern von dem hinteren Befestigungsteil der Plasma-Elektrode entfernt werden, sofern ein Verschleiß an der Elektrodenspitze auftritt.In this way, the front electrode tip can be removed with the electrode core inserted there from the rear attachment part of the plasma electrode, provided that wear on the electrode tip occurs.
Somit ist ein schnelles Auswechseln der Elektrodenspitze möglich, ohne dass damit die gesamte Plasma-Elektrode ausgewechselt werden müsste.Thus, a quick replacement of the electrode tip is possible without the entire plasma electrode would have to be replaced.
In einer bevorzugten Ausgestaltung der Erfindung ist die lösbare Verbindung zwischen den beiden Teilen der Plasma-Elektrode als Schraubverbindung, als Steckverbindung oder als kombinierte Schraub-Steckverbindung ausgebildet.In a preferred embodiment of the invention, 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.
Im einfachsten Fall besteht die Schraubverbindung aus zwei ineinander greifenden Gewinden. An der Elektrodenspitze kann ein Innengewinde angeordnet sein, welches in ein zugeordnetes Außengewinde im Bereich des hinteren Befestigungsteils der Plasma-Elektrode einschraubbar ist.In the simplest case, the screw consists of two interlocking threads. At the electrode tip, an internal thread can be arranged, which can be screwed into an associated external thread in the region of the rear attachment part of the plasma electrode.
In einer anderen Ausgestaltung kann es auch vorgesehen sein, dass die Elektrodenspitze ein Außengewinde aufweist, welches auf ein zugeordnetes Innengewinde des hinteren Befestigungsteils der Plasma-Elektrode einschraubbar ist.In another embodiment, it can also be provided that the electrode tip has an external thread which can be screwed onto an associated internal thread of the rear attachment part of the plasma electrode.
In einer dritten Ausgestaltung kann es vorgesehen sein, dass statt der Schraubverbindung eine Steckverbindung verwendet wird, wie z. B. eine Bajonett-Steckverbindung, die durch eine Dreh-Steck-Bewegung gelöst und befestigt werden kann.In a third embodiment, it may be provided that instead of the screw connection, a plug connection is used, such. As a bayonet connector that can be solved and fixed by a rotary-plug movement.
In einer anderen Ausgestaltung ist es vorgesehen, dass die lösbare Verbindung zwischen den beiden Teilen der Plasma-Elektrode aus einer abgedichteten Flanschverbindung besteht, wobei zwei gegenüberliegend angeordnete Flansche an den beiden einander zugeordneten Teilen sich berühren und flüssigkeitsdicht gegeneinander abgedichtet sind. Eine solche FlanschVerbindung ist durch eine Überwurfmutter in Verbindung mit einem Gewinde am gegenüberliegenden Teil gesichert.In another embodiment, it is provided that 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. Such a flange connection is secured by a union nut in connection with a thread on the opposite part.
Neben den genannten Steck- oder Schraubverbindungen oder Flanschverbindungen oder Kombinationen aus Steck-Schraub-Verbindungen mit Flanschverbindungen sind auch Klemmverbindungen vorgesehen. Eine solche Klemmverbindung ist z. B. eine Flanschverbindung, mit zwei abdichtend gegenüberliegend und aneinander anliegenden Flanschen, die von einem Exzenter-Klemmring auf gegenseitigem Anpressdruck abdichtend gehalten werden.In addition to the aforementioned plug or screw connections or flange connections or combinations of plug-and-screw connections with flange connections, clamping connections are also provided. Such a clamp connection is z. B. a flange, with two sealingly opposite and abutting flanges, of a Eccentric clamping ring to be held sealingly on mutual contact pressure.
Bei allen genannten Verbindungen ist es wichtig, dass, wenn es sich um eine wassergekühlte Plasma-Elektrode handelt, dann die genannte lösbare Verbindung zwischen den mindestens beiden Teilen der Plasma-Elektrode auch flüssigkeitsdicht ausgebildet ist.For all the compounds mentioned, it is important that, if it is a water-cooled plasma electrode, then said releasable connection between the at least two parts of the plasma electrode is also liquid-tight.
Mit der gegebenen technischen Lehre ergibt sich der Vorteil, dass auch hochwertige Materialien in materialschonender Weise verwendet werden können, denn es sind sämtliche Materialpaarungen zwischen dem Material der Elektrodenspitze und dem Material des hinteren Befestigungsteils der Plasma-Elektrode möglich.With the given technical teaching has the advantage that even high-quality materials can be used in a material-friendly manner, because all material combinations between the material of the electrode tip and the material of the rear attachment part of the plasma electrode are possible.
So kann es vorgesehen sein, dass der hintere Befestigungsteil der Plasma-Elektrode aus einem kostengünstigen Kupfer-Material oder einer Kupferlegierung besteht, während der vordere Teil der Elektrodenspitze, der dem Verschleiß unterworfen ist, aus einem Silbermaterial oder einer Silberlegierung besteht.Thus, it may be provided that the rear fixing part of the plasma electrode is made of a low-cost copper material or a copper alloy, while the front part of the electrode tip, which is subject to wear, is made of a silver material or a silver alloy.
Weil nur ein relativ kurzer Bereich der Plasma-Elektrode ausgetauscht werden muss, nämlich nur die kurz ausgebildete Elektrodenspitze, ergibt sich ein besonders materialschonender Einsatz teurer Materialien, wenn z. B. die Elektrodenspitze aus dem hochwertigen Silber oder einer Silberlegierung besteht.Because only a relatively short area of the plasma electrode has to be replaced, namely only the short electrode tip, results in a particularly material-friendly use of expensive materials, if z. B. the electrode tip is made of high-quality silver or a silver alloy.
Bezüglich der Materialpaarungen zwischen dem Material des Befestigungsteils und der Elektrodenspitze gibt es folgende Kombinationen, wobei an erster Stelle stets das Material des Befestigungsteils steht und an zweiter Stelle das Material der Elektrodenspitze:
- Cu-Cu
- Cu-Ag
- Ag-Cu
- Ag-AG
- Cu-Cu
- Cu-Ag
- Ag-Cu
- Ag AG
Die Verwendung von Silber als hochleitfähiges Material wurde nur beispielhaft angegeben. Es können selbstverständlich auch andere hochleitfähige, gut verarbeitbare Materialien verwendet werden, welche die Eigenschaften von Silber aufweisen. Insbesondere kommen hier Zinn-Legierungen in Betracht oder Kupfer-Zinn-Legierungen (Bronze).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).
Die vorgenannten Materialien können in den gleichen vorgenannten Materialpaarungen eingesetzt werden, wie sie am Beispiel des Materials Ag vorstehend angegeben wurden.The abovementioned materials can be used in the same abovementioned material pairings as have been specified above using the example of the material Ag.
Die Erfindung ist nicht auf hohlzylindrische Plasma-Elektroden beschränkt, in deren Innenraum ein Kühlrohr angeordnet ist, mit dem ein Kühlmedium-bevorzugt Wasser - in den Innenraum der Plasmaelektrode eingeleitet, am vorderen Ende, in der Nähe der Elektrodenspitze umgeleitet wird, und danach wieder aus der Plasma-Elektrode herausgeleitet wird. Die Funktion einer derartigen wassergekühlten Plasma-Elektrode ergibt sich aus einer der vorgenannten Druckschriften.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. The function of such a water-cooled plasma electrode results from one of the aforementioned publications.
Die Erfindung beansprucht auch ungekühlte hohlzylindrische oder auch aus Vollmaterial bestehende Plasma-Elektroden, die mindestens zweiteilig sind und der vordere, dem Verschleiß unterworfene Teil leicht lösbar mit dem hinteren Teil verbunden ist.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.
Der Erfindungsgegenstand der vorliegenden Erfindung ergibt sich nicht nur aus dem Gegenstand der einzelnen Patentansprüche, sondern auch aus der Kombination der einzelnen Patentansprüche untereinander.The subject of the present invention results not only from the subject matter of the individual claims, but also from the combination of the individual claims with each other.
Alle in den Unterlagen, einschließlich der Zusammenfassung offenbarten Angaben und Merkmale, insbesondere die in den Zeichnungen dargestellte räumliche Ausbildung, werden als erfindungswesentlich beansprucht, soweit sie einzeln oder in Kombination gegenüber dem Stand der Technik neu sind.All information and features disclosed in the documents, including the abstract, in particular the spatial design shown in the drawings, are claimed to be essential to the invention insofar as they are novel individually or in combination with respect to the prior art.
Im Folgenden wird die Erfindung anhand von mehrere Ausführungswege darstellenden Zeichnungen näher erläutert. Hierbei gehen aus den Zeichnungen und ihrer Beschreibung weitere erfindungswesentliche Merkmale und Vorteile der Erfindung hervor.In the following, the invention will be explained in more detail with reference to drawings illustrating several execution paths. Here are from the drawings and their description further features essential to the invention and advantages of the invention.
Es zeigen:
- Figur 1:
- Schnitt durch eine erste Ausführungsform einer zweiteiligen Plasma-Elektrode in zerlegtem Zustand
- Figur 2:
- Detailschnitt durch die Schraubverbindung nach
Figur 1 - Figur 3:
- Schnitt durch die Plasma-Elektrode nach
Figur 1 im zusammengesetzten Zustand - Figur 4:
- die Schraubverbindung nach
im zusammengesetzten ZustandFigur 2 - Figur 5:
- Schnitt durch eine zweite Ausführungsform einer zweiteiligen Plasma-Elektrode
- Figur 6:
- Schnitt durch die abgedichtete Schraubverbindung
- Figur 7:
- die Plasma-Elektrode nach
Figur 5 im zerlegten Zustand - Figur 8:
- die
Gewindeschraubverbindung nach Figur 7 in Detaildarstellung - Figur 9:
- eine dritte Ausführungsform einer Plasma-Elektrode in zerlegtem Zustand
- Figur 10:
- ein Detail der Gewindeschraubverbindung nach
Figur 9 im zerlegten Zustand - Figur 11:
- die Plasma-
Elektrode nach Figur 9 im zusammengesetzten Zustand - Figur 12:
- die
Gewindeschraubverbindung nach Figur 10 im eingeschraubten Zustand
- FIG. 1:
- Section through a first embodiment of a two-part plasma electrode in disassembled state
- FIG. 2:
- Detail section through the screw connection after
FIG. 1 - FIG. 3:
- Cut through the plasma electrode after
FIG. 1 in the assembled state - FIG. 4:
- the screw connection after
FIG. 2 in the assembled state - FIG. 5:
- Section through a second embodiment of a two-part plasma electrode
- FIG. 6:
- Section through the sealed screw connection
- FIG. 7:
- the plasma electrode after
FIG. 5 in disassembled condition - FIG. 8:
- the threaded connection after
FIG. 7 in detail - FIG. 9:
- a third embodiment of a plasma electrode in disassembled state
- FIG. 10:
- a detail of the threaded connection after
FIG. 9 in disassembled condition - FIG. 11:
- the plasma electrode after
FIG. 9 in the assembled state - FIG. 12:
- the threaded connection after
FIG. 10 in the screwed state
Die in
Statt einer Schraubbefestigung über das Gewinde 8 kann die gesamte Plasma-Elektrode 1 auch in einen nicht näher dargestellten Elektrodenkörper abgedichtet eingesteckt werden. Im Innenraum 10 der Plasma-Elektrode 1 ist ein Kühlrohr 6 zentrisch angeordnet, welches mit seinem vorderen Ende in einen Aufnahmeraum 5 im Bereich der Elektrodenspitze 2 eingreift.Instead of a screw fastening via the
In einer Bohrung der Elektrodenspitze 2 ist ein Elektrodenkern 4 aus einem hoch-emissiven Material eingebracht, wie z. B. einem Hafnium- oder Zirkoniummaterial.In a bore of the
Die Kühlung der Plasma-Elektrode erfolgt dergestalt, dass ein Kühlmittelstrom in den Innenraum 10 des Kühlrohrs 6 eingeleitet wird, der im Bereich des Aufnahmeraums 5 in der Elektrodenspitze 2 umgelenkt wird und dann über die radial außen liegende Innenbohrung 9 wieder zurückgeführt wird.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
Wichtig ist, dass die beiden Teile (Elektrodenspitze 2 und Befestigungsteil 3) lösbar miteinander verbunden sind. Im gezeigten Ausführungsbeispiel nach
Zur selbsttätigen Zentrierung dieses Schraubgewindes ist es vorgesehen, dass einander gegenüberliegende und gleichgerichtete Konusflächen 13, 14 an zugeordneten Flanschen der Elektrodenspitze 2 und des Befestigungsteils 3 angeordnet sind und dass ferner ein bevorzugt ringsumlaufender Ringflansch 15 am Befestigungsteil 3 in eine zugeordnete Ringnut 16 eingreift und sich dort zentriert.For automatic centering of this screw thread, it is provided that opposing and rectified
Durch das Eingreifen von Ringflansch 15 und Ringnut 16 in Verbindung mit den schräg gerichteten Konusflächen 13, 14 kommt es zu einer selbsttätigen Zentrierung der Schraubverbindung.By the engagement of
Zusätzlich können bei vollständiger Verfestigung der Schraubverbindung (siehe
Die
Die Längenverhältnisse dieser beiden Längen 24, 25 können sich im Bereich zwischen 1 : 1 bis 1 : 6 bewegen.The aspect ratios of these two
Wichtig ist bei allen Ausführungsbeispielen, dass die Elektrodenspitze 2 leicht lösbar auf dem elektrodenseitigen Befestigungsteil 3 befestigt ist und deshalb leicht austauschbar ist, wenn sie verschlissen ist. Sie ist kurz gehalten, um den Materialverbrauch beim Austausch niedrig zu halten.It is important in all embodiments that the
Die
Die Gewindeschraubverbindung ist durch einen Dichtring 19 flüssigkeitsdicht abgedichtet.The threaded screw connection is sealed by a sealing
Es kann noch ein weiterer Dichtring 19 im Bereich der einander zugewandten Ansätze 17, 18 angeordnet sein.There may be another sealing
Die
Auch hier ist an der hinteren Seite der Elektrodenspitze 2 ein Außengewinde angeordnet, welches mit einem Innengewinde im Innenraum des Befestigungsteils 3 zusammenwirkt und die gesamte Gewindeschraubverbindung durch einen Dichtring 19 flüssigkeitsdicht abgedichtet ist, der in einer zugeordneten Ringnut 23 am vertikalen Flansch der Elektrodenspitze 2 eingesetzt ist.Again, an external thread is arranged on the rear side of the
Das Außengewinde 21 an der Elektrodenspitze 2 wirkt also mit dem Innengewinde 22 am Befestigungsteil 3 als Schraubgewinde 12 zusammen.The
Die
Hier weist die Elektrodenspitze 2 ein Innengewinde 22 auf, welches mit dem zugeordneten Außengewinde 21 die abgedichtete Schraubverbindung im Bereich des Verbindungsteils 11 ergibt.Here, the
Die
- 11
- Plasma-ElektrodePlasma electrode
- 22
- Elektrodenspitzeelectrode tip
- 33
- Befestigungsteilattachment portion
- 44
- Elektrodenkernelectrode core
- 55
- Aufnahmeraumaccommodation space
- 66
- Kühlrohrcooling pipe
- 77
- Befestigungsflanschmounting flange
- 88th
- Gewindethread
- 99
- Innenbohrunginternal bore
- 1010
- Innenrauminner space
- 1111
- Verbindungsteilconnecting part
- 1212
- Schraubgewindescrew thread
- 1313
- Konusflächencone surfaces
- 1414
- Konusflächencone surfaces
- 1515
- Ringflanschannular flange
- 1616
- Ringnutring groove
- 1717
- Ansatzapproach
- 1818
- Ansatzapproach
- 1919
- Dichtringseal
- 2020
- Schlüsselflächekey area
- 2121
- Außengewindeexternal thread
- 2222
- Innengewindeinner thread
- 2323
- Ringnut (für 19)Ring groove (for 19)
- 2424
- Länge (von 2)Length (from 2)
- 2525
- Länge (von 3)Length (from 3)
Claims (10)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12002077.1A EP2642832A1 (en) | 2012-03-23 | 2012-03-23 | Plasma electrode for a plasma arc torch with exchangeable electrode tip |
PCT/EP2013/000876 WO2013139484A1 (en) | 2012-03-23 | 2013-03-22 | Plasma electrode for a plasma arc torch with a replaceable electrode tip |
EP13714852.4A EP2829162B1 (en) | 2012-03-23 | 2013-03-22 | Plasma electrode for a plasma arc torch with exchangeable electrode tip |
US14/361,903 US9736916B2 (en) | 2012-03-23 | 2013-03-22 | Plasma electrode for a plasma arc torch with replaceable electrode tip |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12002077.1A EP2642832A1 (en) | 2012-03-23 | 2012-03-23 | Plasma electrode for a plasma arc torch with exchangeable electrode tip |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2642832A1 true EP2642832A1 (en) | 2013-09-25 |
Family
ID=48050654
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12002077.1A Withdrawn EP2642832A1 (en) | 2012-03-23 | 2012-03-23 | Plasma electrode for a plasma arc torch with exchangeable electrode tip |
EP13714852.4A Not-in-force EP2829162B1 (en) | 2012-03-23 | 2013-03-22 | Plasma electrode for a plasma arc torch with exchangeable electrode tip |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13714852.4A Not-in-force EP2829162B1 (en) | 2012-03-23 | 2013-03-22 | Plasma electrode for a plasma arc torch with exchangeable electrode tip |
Country Status (3)
Country | Link |
---|---|
US (1) | US9736916B2 (en) |
EP (2) | EP2642832A1 (en) |
WO (1) | WO2013139484A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CZ308703B6 (en) * | 2020-02-05 | 2021-03-03 | B&Bartoni, spol. s r.o. | Electrode set for plasma arc torch with improved electric current transfer |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109079294B (en) * | 2018-10-31 | 2023-08-11 | 浙江巨化装备制造有限公司 | Automatic continuous tungsten rod replacement device and method for gun head of full-automatic tube plate welding machine |
WO2020206429A1 (en) * | 2019-04-04 | 2020-10-08 | Hypertherm, Inc. | Adjustable length consumables for a liquid-cooled plasma arc torch |
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US5440094A (en) * | 1994-04-07 | 1995-08-08 | Douglas G. Carroll | Plasma arc torch with removable anode ring |
US6114650A (en) * | 1998-08-12 | 2000-09-05 | The Esab Group, Inc. | Electrode for plasma arc torch and method of making same |
EP1633172A2 (en) | 2004-09-03 | 2006-03-08 | The Esab Group, Inc. | Electrode and electrode holder with threaded connection |
JP2007180028A (en) | 2005-12-21 | 2007-07-12 | Esab Group Inc | Plasma arc torch, and methods of assembling and disassembling plasma arc torch |
EP1765046B1 (en) | 2005-09-07 | 2010-08-25 | Hypertherm, Inc. | Plasma torch electrode with improved insert configurations |
US20110240609A1 (en) * | 2008-12-18 | 2011-10-06 | Katrin Jehnert | Electrode for a Plasma Torch |
EP2408274A2 (en) | 2010-07-16 | 2012-01-18 | Hypertherm, Inc. | Torch flow regulation using nozzle features. |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US5216221A (en) * | 1992-01-17 | 1993-06-01 | Esab Welding Products, Inc. | Plasma arc torch power disabling mechanism |
US6498316B1 (en) * | 1999-10-25 | 2002-12-24 | Thermal Dynamics Corporation | Plasma torch and method for underwater cutting |
US9662747B2 (en) * | 2006-09-13 | 2017-05-30 | Hypertherm, Inc. | Composite consumables for a plasma arc torch |
DE102009016932B4 (en) * | 2009-04-08 | 2013-06-20 | Kjellberg Finsterwalde Plasma Und Maschinen Gmbh | Cooling tubes and electrode holder for an arc plasma torch and arrangements of the same and arc plasma torch with the same |
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/en not_active Withdrawn
-
2013
- 2013-03-22 EP EP13714852.4A patent/EP2829162B1/en not_active Not-in-force
- 2013-03-22 US US14/361,903 patent/US9736916B2/en active Active
- 2013-03-22 WO PCT/EP2013/000876 patent/WO2013139484A1/en active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5440094A (en) * | 1994-04-07 | 1995-08-08 | Douglas G. Carroll | Plasma arc torch with removable anode ring |
US6114650A (en) * | 1998-08-12 | 2000-09-05 | The Esab Group, Inc. | Electrode for plasma arc torch and method of making same |
EP1633172A2 (en) | 2004-09-03 | 2006-03-08 | The Esab Group, Inc. | Electrode and electrode holder with threaded connection |
US20060049150A1 (en) * | 2004-09-03 | 2006-03-09 | The Esab Group, Inc. | Electrode and electrode holder with threaded connection |
EP1765046B1 (en) | 2005-09-07 | 2010-08-25 | Hypertherm, Inc. | Plasma torch electrode with improved insert configurations |
JP2007180028A (en) | 2005-12-21 | 2007-07-12 | Esab Group Inc | Plasma arc torch, and methods of assembling and disassembling plasma arc torch |
US20110240609A1 (en) * | 2008-12-18 | 2011-10-06 | Katrin Jehnert | Electrode for a Plasma Torch |
EP2408274A2 (en) | 2010-07-16 | 2012-01-18 | Hypertherm, Inc. | Torch flow regulation using nozzle features. |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CZ308703B6 (en) * | 2020-02-05 | 2021-03-03 | B&Bartoni, spol. s r.o. | Electrode set for plasma arc torch with improved electric current transfer |
WO2021155874A1 (en) | 2020-02-05 | 2021-08-12 | B&Bartoni, spol. s r.o. | Electrode assembly for plasma arc torch with the improved electric current transfer |
Also Published As
Publication number | Publication date |
---|---|
EP2829162A1 (en) | 2015-01-28 |
US20140291303A1 (en) | 2014-10-02 |
US9736916B2 (en) | 2017-08-15 |
WO2013139484A1 (en) | 2013-09-26 |
WO2013139484A4 (en) | 2013-11-21 |
EP2829162B1 (en) | 2017-05-17 |
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