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EP1692922A1 - Plasma spraying device - Google Patents

Plasma spraying device

Info

Publication number
EP1692922A1
EP1692922A1 EP04761956A EP04761956A EP1692922A1 EP 1692922 A1 EP1692922 A1 EP 1692922A1 EP 04761956 A EP04761956 A EP 04761956A EP 04761956 A EP04761956 A EP 04761956A EP 1692922 A1 EP1692922 A1 EP 1692922A1
Authority
EP
European Patent Office
Prior art keywords
burner
spraying device
plasma spraying
burner head
lines
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
Application number
EP04761956A
Other languages
German (de)
French (fr)
Other versions
EP1692922B1 (en
Inventor
Silvano Keller
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.)
AMT AG
Original Assignee
AMT AG
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 AMT AG filed Critical AMT AG
Publication of EP1692922A1 publication Critical patent/EP1692922A1/en
Application granted granted Critical
Publication of EP1692922B1 publication Critical patent/EP1692922B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3423—Connecting means, e.g. electrical connecting means or fluid connections

Definitions

  • the invention relates to a plasma spray device designed according to the preamble of claim 1.
  • a plasma spraying device with an exchangeable burner head, which is connected to the burner shaft by means of plug connections, is known, for example, from EP 585 203.
  • the object of the invention is now to propose a plasma spray device designed according to the preamble of claim 1, in which the lines between the burner shaft and the burner head can be connected safely and reliably, in particular in the case of the lines receiving the cooling medium, a tight connection should be ensured , while the lowest possible contact resistance is in the foreground for the lines provided for the transmission of the electrical energy, and in particular the number of lines should also be optimized.
  • the basic idea of the invention is to provide tubular lines between the burner shaft and the burner head, by means of which Both the cooling medium required to cool the burner head and the electrical energy required to generate an arc can be transmitted, the said tubular lines each being provided with a mechanically separable interface which provides a positive and non-positive connection between the respective line of the burner shaft and the corresponding line section of the burner head guaranteed.
  • a mechanically separable interface which ensures a positive and non-positive connection between the respective lines, can on the one hand ensure a hydraulically sealed connection between the lines. On the other hand, this creates an interface with low electrical contact resistance, which ensures safe, permanent and reliable power transmission even under difficult conditions, such as oxidized or contaminated contact points.
  • FIG. 1 shows, in a partially schematic representation, the front part of the burner shaft 1 and the entire burner head 2 in a longitudinal section, the features which are essential in connection with the invention being dealt with below.
  • the burner shaft 1 serves to supply the operating resources necessary for the operation of the burner head 2.
  • the term operating equipment means both the media to be fed to the burner head, such as cooling liquid and plasma gas, but also the electrical energy, the coating powder and, if appropriate, protective gas, this list not to be regarded as exhaustive.
  • the burner head 2 essentially consists of a rear cathode body 3, a front anode body 4 and an interposed insulating washer 5, which projects radially beyond the cathode body 3 and the anode body 4 and electrically insulates the two bodies 3, 5 from one another.
  • An electrode acting as a cathode 6 is let into the cathode body 3, while the anode body 4 is provided with an electrode acting as an anode 7.
  • the cathode 6 is essentially cylindrical, while the anode 7 is hollow-cylindrical and at the same time forms the nozzle from which the plasma jet emerges.
  • Both the cathode body 3 and the anode body 4 consist of a metal with good electrical and good thermal conductivity.
  • An annular cooling channel 8, 9 is embedded in both the cathode body 3 and the anode body 4. These two cooling channels 8, 9 are each provided with an inlet and an outlet, to each of which a tubular line section 11, 12 is soldered.
  • the respective line section 11, 12 is provided at the end with a hollow cylindrical section 13, 14 which is enlarged in diameter and which serves as a stop for a union nut 15, 16.
  • the tubular line sections 11, 12 serve on the one hand to supply a cooling medium - cooling water - to the burner head. On the other hand, they serve as electrical conductors, by means of which the electrical energy required for generating the arc is transmitted from the burner shaft 1 to the burner head 2.
  • the burner shaft 1 is provided with a hollow cylindrical front part 1a facing the burner head 2, into which the lines provided for supplying the media and operating materials open.
  • 1 shows two of a total of four tubular lines 17, 18, which serve to supply the cooling medium and the electrical energy.
  • These tubular lines 17, 18 each have a sleeve 19, 20 provided with an external thread at the end.
  • the sleeves 19, 20 are preferably soldered to the corresponding lines 17, 18.
  • the respective union nut 15, 16 is screwed onto the thread of the respective sleeve 19, 20 and tightened, as a result of which there is a secure and tight connection between the respective line 17, 18 of the burner shaft 1 and the respective line section 11, 12 of the burner head 2.
  • the union nut 15, 16, which is preferably provided with flats for attaching a wrench, forms, together with the respective sleeve 19, 20, a mechanical interface S1, S2.
  • Both the enlarged, hollow-cylindrical section 13, 14 and the sleeve 19, 20 provided with an external thread are provided with flat end faces, the latter abutting one another.
  • the hollow cylindrical Sections 13, 14 as well as the sleeves 19, 20 each have an O-ring 21, 22, 23, 24 in the area adjacent to the end faces.
  • the four named line sections 11, 12 are dimensioned in such a way that, together with the screw connections, they enable the burner head 2 to be securely mechanically attached to the burner shaft 1 without additional mechanical connecting elements being necessary.
  • a line section 26 connected to the cathode body 3 which leads radially into the cathode body 3 and serves to supply plasma gas, while via a further line section 27, which runs below the anode body 4, wettable powder can be introduced radially into the plasma jet.
  • the two named line sections 26, 27 are connected in a conventional manner by means of a plug connection to the corresponding line 28, 29 of the burner shaft 1.
  • Three screws 30 are provided for connecting the parts of the burner head 1, namely the cathode body 3, the anode body 4 and the insulating disk 5 interposed, of which only one is visible.
  • a nut 31 made of an insulating material is screwed onto the end of the respective screw 30.
  • each screw 30 is radially surrounded by an insulating sleeve 32.
  • FIG. 2 which shows a plan view of the anode body 4 of the burner head, shows the two line sections 11, 11a leading into the anode body 4 for supplying the cooling medium.
  • the union nut 15, 15a fixed to the respective line section 11, 11a is shown in longitudinal section. Between the two line sections 11, 11a mentioned, the line section 26 leading radially into the cathode body 3 for supplying the plasma gas can be seen.
  • a screw connection has that Another advantage is that, in contrast to a plug connection, it forms an interface with good electrical contact, with low contact resistance and a large contact area. In addition, it is relatively insensitive to oxidation and soiling, since any protection when the union nut is tightened is displaced from the contact surfaces. In particular, this also reduces the risk of parasitic arcs. Finally, a screw connection also guarantees high mechanical stability, so that additional mechanical fastening elements can be dispensed with.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Nozzles (AREA)

Abstract

Disclosed is a plasma spraying device that is fitted with a burner shaft (1) and a burner head (2) to be fixed thereto. In order to rapidly and easily replace the burner head (2) and its wearing parts, the burner head (2) is releasably fixed to the burner shaft. The lines extending between the burner shaft (1) and the burner head (2) are separable. Electrically conductive tubular lines (17, 18) are provided for supplying the cooling fluid and at the same time conducting electric power. Said tubular lines (17, 18) are fitted with a mechanically separable interface (S1, S2) for producing an interlocking and non-positive connection between the line of the burner shaft (17, 18) and the corresponding line segment (11, 12) of the burner head (2). The mechanically separable interface (S1, S2) can be configured in the form of a screw connection or a bayonet socket.

Description

Plasmaspritzvorrichtung Plasma spray device
Die Erfindung betrifft eine gemäss dem Oberbegriff des Anspruchs 1 ausgebildete Plasmaspritzvorrichtung.The invention relates to a plasma spray device designed according to the preamble of claim 1.
Bekanntermassen unterliegen bei gattungsgemässen Plasmaspritzvorrichtungen gewisse Teile des Brennerkopfs, beispielsweise die Elektrode und die Brennerdüse, einem hohen Verschleiss. Um diese abgenutzten Teile einfach und bequem ersetzen zu können, finden vermehrt Plasmaspritzvorrichtungen mit auswechselbaren Brennerköpfen Verwendung. Eine Problematik auswechselbarer Brennerköpfe besteht darin, dass die zum Zuführen der Betriebsmittel, insbesondere der Kühlflüssigkeit, vorgesehenen Leitungen an der Schnittstelle zwischen Brennerschaft und Brennerkopf dicht miteinander verbunden werden müssen, was bei den bis anhin zumeist eingesetzten Steckverbindungen oft Schwierigkeiten bereitet. Ausserdem besteht die Gefahr, dass die zum Übertragen der elektrischen Energie vorgesehenen Leitungen an der Kupplungsstelle durch das Entstehen von parasitären Lichtbögen schnell verschleissen, zumal zum Erzeugen des Lichtbogens in der Regel Ströme von mehreren hundert Ampere übertragen werden müssen .As is known, certain parts of the burner head, for example the electrode and the burner nozzle, are subject to high wear in the case of generic plasma spraying devices. In order to be able to replace these worn parts easily and conveniently, plasma spraying devices with exchangeable burner heads are increasingly being used. One problem with exchangeable burner heads is that the lines provided for supplying the operating materials, in particular the coolant, must be tightly connected to one another at the interface between the burner shaft and the burner head, which often causes difficulties with the plug connections which have hitherto been used. In addition, there is a risk that the lines provided for the transmission of the electrical energy at the coupling point will quickly wear out due to the formation of parasitic arcs, especially since currents of several hundred amperes generally have to be transmitted in order to generate the arc.
Eine Plasmaspritzvorrichtung mit einem auswechselbaren Brennerkopf, der mittels Steckverbindungen mit dem Brennerschaft verbunden ist, ist beispielsweise aus der EP 585 203 bekannt.A plasma spraying device with an exchangeable burner head, which is connected to the burner shaft by means of plug connections, is known, for example, from EP 585 203.
Die Aufgabe der Erfindung besteht nun darin, eine nach dem Oberbegriff des Anspruchs 1 ausgebildete Plasmaspritzvorrichtung vorzuschlagen, bei der die Leitungen zwischen dem Brennerschaft und dem Brennerkopf sicher und zuverlässig verbunden werden können, wobei insbesondere bei den das Kühlmedium aufnehmenden Leitungen eine dichte Verbindung gewährleistet werden soll, während bei den für die Übertragung der elektrischen Energie vorgesehenen Leitungen ein möglichst geringer Übergangswiderstand im Vordergrund steht, und wobei insbesondere auch die Anzahl der Leitungen optimiert werden soll.The object of the invention is now to propose a plasma spray device designed according to the preamble of claim 1, in which the lines between the burner shaft and the burner head can be connected safely and reliably, in particular in the case of the lines receiving the cooling medium, a tight connection should be ensured , while the lowest possible contact resistance is in the foreground for the lines provided for the transmission of the electrical energy, and in particular the number of lines should also be optimized.
Diese Aufgabe wird durch eine Plasmaspritzvorrichtung gelöst, welche mit den im Kennzeichen des Anspruchs 1 aufgeführten Merkmalen versehen ist.This object is achieved by a plasma spraying device which is provided with the features listed in the characterizing part of claim 1.
Der grundsätzliche Erfindungsgedanke besteht darin, rohrförmige Leitungen zwischen dem Brennerschaft und dem Brennerkopf vorzusehen, mittels welchen sowohl das zum Kühlen des Brennerkopfs notwendige Kühlmedium wie auch die zum Erzeugen eines Lichtbogens notwendige elektrische Energie übertragen werden kann, wobei die genannten rohrförmigen Leitungen mit je einer mechanisch auftrennbaren Schnittstelle versehen sind, die eine form- und kraftschlüssige Verbindung zwischen der jeweiligen Leitung des Brennerschafts und dem korrespondierenden Leitungsabschnitt des Brennerkopfs gewährleistet. Durch eine mechanisch auftrennbare Schnittstelle, die eine form- und kraftschlüssige Verbindung zwischen den jeweiligen Leitungen sicherstellt, kann zum einen eine hydraulisch dichte Verbindung zwischen den Leitungen sichergestellt werden. Zum anderen wird dadurch eine Schnittstelle mit geringem elektrischen Übergangswiderstand geschaffen, die auch bei erschwerten Bedingungen, wie beispielsweise oxydierten oder verschmutzten Kontaktstellen, eine sichere, dauerhafte und zuverlässige Stromübertragung sicherstellt. Indem rohrförmige Leitungen vorgesehen werden, welche zum einen das Kühlmedium aufnehmen und zum anderen die elektrische Energie übertragen, kann zudem sowohl der Platzbedarf wie auch die Anzahl der Leitungen reduziert bzw. optimiert werden.The basic idea of the invention is to provide tubular lines between the burner shaft and the burner head, by means of which Both the cooling medium required to cool the burner head and the electrical energy required to generate an arc can be transmitted, the said tubular lines each being provided with a mechanically separable interface which provides a positive and non-positive connection between the respective line of the burner shaft and the corresponding line section of the burner head guaranteed. A mechanically separable interface, which ensures a positive and non-positive connection between the respective lines, can on the one hand ensure a hydraulically sealed connection between the lines. On the other hand, this creates an interface with low electrical contact resistance, which ensures safe, permanent and reliable power transmission even under difficult conditions, such as oxidized or contaminated contact points. By providing tubular lines which on the one hand hold the cooling medium and on the other hand transmit the electrical energy, both the space requirement and the number of lines can be reduced or optimized.
Bevorzugte Ausführungsformen der Plasmaspritzvorrichtung sind in den abhängigen Ansprüchen 2 bis 10 umschrieben.Preferred embodiments of the plasma spraying device are described in the dependent claims 2 to 10.
Nachfolgend wird ein bevorzugtes Ausführungsbeispiel der Erfindung anhand von Zeichnungen näher erläutert. In diesen Zeichnungen zeigt:A preferred exemplary embodiment of the invention is explained in more detail below with reference to drawings. In these drawings:
Fig. 1 einen Längsschnitt durch den Brennerkopf;1 shows a longitudinal section through the burner head.
Fig. 2 eine Draufsicht auf den Anodenkörper des Brennerkopfs;2 shows a plan view of the anode body of the burner head;
Die Figur 1 zeigt in teilweise schematischer Darstellung den vorderen Teil des Brennerschafts 1 sowie den gesamten Brennerkopf 2 in einem Längsschnitt, wobei nachfolgend insbesondere auf die im Zusammenhang mit der Erfindung wesentlichen Merkmale eingegangen wird. Der Brennerschaft 1 dient dem Zuführen der für den Betrieb des Brennerkopfs 2 notwendigen Betriebsmittel. Unter dem Begriff Betriebsmittel werden im vorliegenden Fall sowohl die dem Brennerkopf zuzuführenden Medien wie Kühlflüssigkeit und Plasmagas aber auch die elektrische Energie, das Beschichtungspulver sowie ggf. Schutzgas verstanden, wobei diese Aufzählung nicht als abschliessend zu betrachten ist. Der Brennerkopf 2 besteht im wesentlichen aus einem hinteren Kathodenkörper 3, einem vorderen Anodenkörper 4 und einer dazwischengefügten Isolierscheibe 5, welche den Kathodenkörper 3 und den Anodenkörper 4 radial überragt und die beiden Körper 3, 5 gegeneinander elektrisch isoliert. In den Kathodenkörper 3 ist eine als Kathode 6 wirkende Elektrode eingelassen, während der Anodenkörper 4 mit einer als Anode 7 wirkenden Elektrode versehen ist. Die Kathode 6 ist im wesentlichen zylindrisch ausgebildet während die Anode 7 hohlzylindrisch ausgebildet ist und gleichzeitig die Düse bildet, aus welcher der Plasmastrahl austritt. Sowohl der Kathodenkörper 3 wie auch der Anodenkörper 4 bestehen aus einem Metall mit guter elektrischer- sowie guter Wärmeleitfähigkeit. Als Metalle hierfür kommen beispielsweise Kupfer oder Messing in Frage. Sowohl in den Kathodenkörper 3 wie auch in den Anodenkörper 4 ist je ein ringförmiger Kühlkanal 8, 9 eingelassen. Diese beiden Kühlkanale 8, 9 sind mit je einem Ein- und Auslass versehen, an welchen jeweils ein rohrförmiger Leitungsabschnitt 11, 12 angelötet ist. Der jeweilige Leitungsabschnitt 11 , 12 ist endseitig mit einem im Durchmesser vergrösserten, hohlzylindrischen Abschnitt 13, 14 versehen, der als Anschlag für eine Überwurfmutter 15, 16 dient. Die rohrförmigen Leitungsabschnitte 11, 12 dienen einerseits dem Zuführen eines Kühlmediums - Kühlwasser- zum Brennerkopf. Andererseits dienen sie als elektrische Leiter, mittels welchen die zum Erzeugen des Lichtbogens notwendige elektrische Energie vom Brennerschaft 1 auf den Brennerkopf 2 übertragen wird.FIG. 1 shows, in a partially schematic representation, the front part of the burner shaft 1 and the entire burner head 2 in a longitudinal section, the features which are essential in connection with the invention being dealt with below. The burner shaft 1 serves to supply the operating resources necessary for the operation of the burner head 2. In the present case, the term operating equipment means both the media to be fed to the burner head, such as cooling liquid and plasma gas, but also the electrical energy, the coating powder and, if appropriate, protective gas, this list not to be regarded as exhaustive. The burner head 2 essentially consists of a rear cathode body 3, a front anode body 4 and an interposed insulating washer 5, which projects radially beyond the cathode body 3 and the anode body 4 and electrically insulates the two bodies 3, 5 from one another. An electrode acting as a cathode 6 is let into the cathode body 3, while the anode body 4 is provided with an electrode acting as an anode 7. The cathode 6 is essentially cylindrical, while the anode 7 is hollow-cylindrical and at the same time forms the nozzle from which the plasma jet emerges. Both the cathode body 3 and the anode body 4 consist of a metal with good electrical and good thermal conductivity. Copper or brass, for example, are suitable as metals for this. An annular cooling channel 8, 9 is embedded in both the cathode body 3 and the anode body 4. These two cooling channels 8, 9 are each provided with an inlet and an outlet, to each of which a tubular line section 11, 12 is soldered. The respective line section 11, 12 is provided at the end with a hollow cylindrical section 13, 14 which is enlarged in diameter and which serves as a stop for a union nut 15, 16. The tubular line sections 11, 12 serve on the one hand to supply a cooling medium - cooling water - to the burner head. On the other hand, they serve as electrical conductors, by means of which the electrical energy required for generating the arc is transmitted from the burner shaft 1 to the burner head 2.
Der Brennerschaft 1 ist mit einem hohlzylindrischen, dem Brennerkopf 2 zugewandten Vorderteil 1a versehen, in welchen die zum Zuführen der Medien und Betriebsmittel vorgesehenen Leitungen münden. Namentlich sind aus der Darstellung gemäss Fig. 1 zwei von insgesamt vier rohrförmigen Leitungen 17, 18 ersichtlich, welche dem Zuführen des Kühlmediums sowie der elektrischen Energie dienen. Diese rohrförmigen Leitungen 17, 18 weisen endseitig je eine mit einem Aussengewinde versehene Hülse 19, 20 auf. Die Hülsen 19, 20 sind vorzugsweise an den entsprechenden Leitungen 17, 18 angelötet. Die jeweilige Überwurfmutter 15, 16 ist auf das Gewinde der jeweiligen Hülse 19, 20 aufgeschraubt und festgezogen, wodurch eine sichere und dichte Verbindung zwischen der jeweiligen Leitung 17, 18 des Brennerschafts 1 und dem jeweiligen Leitungsabschnitt 11 , 12 des Brennerkopfs 2 besteht. Die vorzugsweise mit Abflachungen zum Ansetzen eines Schraubenschlüssels versehene Überwurfmutter 15, 16 bildet zusammen mit der jeweiligen Hülse 19, 20 eine mechanische Schnittstelle S1, S2. Sowohl der im Durchmesser vergrösserte, hohlzylindrische Abschnitt 13, 14 wie auch die mit einem Aussengewinde versehene Hülse 19, 20 sind mit planen Stirnflächen versehen, welche letztere sich aneinander anlegen. Zusätzlich weisen die hohlzylindrischen Abschnitte 13, 14 wie auch die Hülsen 19, 20 in dem an die Stirnflächen angrenzenden Bereich je einen O-Ring 21 , 22, 23, 24 auf. Die vier genannten Leitungsabschnitte 11 , 12 sind derart dimensioniert, dass sie zusammen mit den Schraubverbindungen ein sicheres mechanisches Befestigen des Brennerkopfs 2 am Brennerschaft 1 ermöglichen, ohne dass zusätzliche mechanische Verbindungselemente notwendig sind. Um den Brennerkopf 2 vom Brennerschaft 1 zu lösen, brauchen lediglich die Überwurfmuttern 15, 16 gelöst zu werden. Nach dem Lösen der Überwurfmuttern 15, 16 kann der Brennerkopf 2 nach links vom Brennerschaft abgezogen werden.The burner shaft 1 is provided with a hollow cylindrical front part 1a facing the burner head 2, into which the lines provided for supplying the media and operating materials open. 1 shows two of a total of four tubular lines 17, 18, which serve to supply the cooling medium and the electrical energy. These tubular lines 17, 18 each have a sleeve 19, 20 provided with an external thread at the end. The sleeves 19, 20 are preferably soldered to the corresponding lines 17, 18. The respective union nut 15, 16 is screwed onto the thread of the respective sleeve 19, 20 and tightened, as a result of which there is a secure and tight connection between the respective line 17, 18 of the burner shaft 1 and the respective line section 11, 12 of the burner head 2. The union nut 15, 16, which is preferably provided with flats for attaching a wrench, forms, together with the respective sleeve 19, 20, a mechanical interface S1, S2. Both the enlarged, hollow-cylindrical section 13, 14 and the sleeve 19, 20 provided with an external thread are provided with flat end faces, the latter abutting one another. In addition, the hollow cylindrical Sections 13, 14 as well as the sleeves 19, 20 each have an O-ring 21, 22, 23, 24 in the area adjacent to the end faces. The four named line sections 11, 12 are dimensioned in such a way that, together with the screw connections, they enable the burner head 2 to be securely mechanically attached to the burner shaft 1 without additional mechanical connecting elements being necessary. To loosen the burner head 2 from the burner shaft 1, only the union nuts 15, 16 need to be loosened. After loosening the union nuts 15, 16, the burner head 2 can be pulled off to the left of the burner shaft.
Nebst den vier Kühlwasserleitungen 17, 18 führen weitere Leitungen vom Brennerschaft 1 zum Brennerkopf 2. Diesbezüglich wird ein mit dem Kathodenkörper 3 verbundener Leitungsabschnitt 26 erwähnt, der radial in den Kathodenkörper 3 führt und dem Zuführen von Plasmagas dient, während über einen weiteren Leitungsabschnitt 27, der unterhalb des Anodenkörpers 4 verläuft, Spritzpulver radial in den Plasmastrahl eingebracht werden kann. Die beiden genannten Leitungsabschnitte 26, 27 werden in herkömmlicher Weise mittels einer Steckverbindung mit der entsprechenden Leitung 28, 29 des Brennerschafts 1 verbunden. Zum Verbinden der Teile des Brennerkopfs 1 , namentlich des Kathodenkörpers 3, des Anodenkörpers 4 und der dazwischengefügten Isolierscheibe 5, sind drei Schrauben 30 vorgesehen, von denen jedoch nur die eine ersichtlich ist. Auf die jeweilige Schraube 30 ist endseitig eine aus einem isoliermaterial bestehende Mutter 31 aufgeschraubt. Zusätzlich ist jede Schraube 30 radial von einer Isolierhülse 32 umgeben.In addition to the four cooling water lines 17, 18, further lines lead from the burner shaft 1 to the burner head 2. In this regard, a line section 26 connected to the cathode body 3 is mentioned which leads radially into the cathode body 3 and serves to supply plasma gas, while via a further line section 27, which runs below the anode body 4, wettable powder can be introduced radially into the plasma jet. The two named line sections 26, 27 are connected in a conventional manner by means of a plug connection to the corresponding line 28, 29 of the burner shaft 1. Three screws 30 are provided for connecting the parts of the burner head 1, namely the cathode body 3, the anode body 4 and the insulating disk 5 interposed, of which only one is visible. A nut 31 made of an insulating material is screwed onto the end of the respective screw 30. In addition, each screw 30 is radially surrounded by an insulating sleeve 32.
Aus der Fig. 2, welche eine Draufsicht auf den Anodenkörper 4 des Brennerkopfs zeigt, sind die beiden in den Anodenkörper 4 führenden Leitungsabschnitte 11 , 11a zum Zuführen des Kühlmediums ersichtlich. Die am jeweiligen Leitungsabschnitt 11, 11a fixierte Überwurfmutter 15, 15a ist im Längsschnitt dargestellt. Zwischen den beiden genannten Leitungsabschnitten 11, 11a ist der radial in den Kathodenkörper 3 führende Leitungsabschnitt 26 zum Zuführen des Plasmagases ersichtlich.2, which shows a plan view of the anode body 4 of the burner head, shows the two line sections 11, 11a leading into the anode body 4 for supplying the cooling medium. The union nut 15, 15a fixed to the respective line section 11, 11a is shown in longitudinal section. Between the two line sections 11, 11a mentioned, the line section 26 leading radially into the cathode body 3 for supplying the plasma gas can be seen.
Die Vorteile einer mechanisch auftrennbaren Schnittstelle S1, S2 in Form der vorgängig beschriebenen Schraubverbindung bestehen darin, dass sowohl eine sichere mechanische wie auch hydraulische Verbindung zwischen dem jeweiligen Leitungsabschnitt 11, 12 des Brennerkopfs 2 und der entsprechenden Leitung 17, 18 des Brennerschafts 1 hergestellt werden kann. Eine Schraubverbindung hat den weiteren Vorteil, dass durch sie, im Gegensatz zu einer Steckverbindung, eine Schnittstelle mit einem guten elektrischen Kontakt, mit geringem Übergangswiderstand und grosser Kontaktfläche gebildet wird. Ausserdem ist sie in Bezug auf Oxidation und Verschmutzung relativ unempfindlich, da allfälliger Schutz beim Festziehen der Überwurfmutter von den Kontaktflächen verdrängt wird. Dadurch wird insbesondere auch die Gefahr von parasitären Lichtbögen vermindert. Schliesslich garantiert eine Schraubverbindung auch eine hohe mechanische Stabilität, so dass auf zusätzliche mechanische Befestigungselemente verzichtet werden kann.The advantages of a mechanically separable interface S1, S2 in the form of the screw connection described above consist in the fact that both a secure mechanical and hydraulic connection can be established between the respective line section 11, 12 of the burner head 2 and the corresponding line 17, 18 of the burner shaft 1 , A screw connection has that Another advantage is that, in contrast to a plug connection, it forms an interface with good electrical contact, with low contact resistance and a large contact area. In addition, it is relatively insensitive to oxidation and soiling, since any protection when the union nut is tightened is displaced from the contact surfaces. In particular, this also reduces the risk of parasitic arcs. Finally, a screw connection also guarantees high mechanical stability, so that additional mechanical fastening elements can be dispensed with.
Anstelle der beschriebenen Schraubverbindung können natürlich auch andere mechanische Schnittstellen wie beispielsweise ein Bajonettverschluss vorgesehen werden. Instead of the screw connection described, other mechanical interfaces such as a bayonet lock can of course also be provided.

Claims

Patentansprüche claims
1. Plasmaspritzvorrichtung mit einem Brennerschaft (1) und einem lösbar daran fixierten Brennerkopf (2), wobei eine Vielzahl von auftrennbaren Leitungen (17, 18, 28, 29) zwischen dem Brennerschaft (1) und dem Brennerkopf (2) verlaufen, welche dem Zuführen der für den Betrieb des Brennerkopfs (2) notwendigen Betriebsmittel wie Plasmagas, Beschichtungspulver, elektrische Energie sowie Kühlflüssigkeit dienen, dadurch gekennzeichnet, dass elektrisch leitende, rohrförmige Leitungen (17, 18) zum Zuführen der Kühlflüssigkeit und zum gleichzeitigen Übertragen der elektrischen Energie vorgesehen sind, welche Leitungen (17, 18) mit je einer mechanisch auftrennbaren Schnittstelle (S1, S2) zum Herstellen einer form- und kraftschlüssigen Verbindung zwischen der jeweiligen Leitung des Brennerschafts (17, 18) und dem korrespondierenden Leitungsabschnitt (11, 12) des Brennerkopfs (2) versehen sind.1. Plasma spraying device with a burner shaft (1) and a burner head (2) detachably attached thereto, wherein a plurality of separable lines (17, 18, 28, 29) run between the burner shaft (1) and the burner head (2), which the The supply of the operating resources necessary for the operation of the burner head (2) such as plasma gas, coating powder, electrical energy and cooling liquid are used, characterized in that electrically conductive, tubular lines (17, 18) are provided for supplying the cooling liquid and for simultaneously transmitting the electrical energy Which lines (17, 18) each have a mechanically separable interface (S1, S2) for establishing a positive and non-positive connection between the respective line of the burner shaft (17, 18) and the corresponding line section (11, 12) of the burner head ( 2) are provided.
2. Plasmaspritzvorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die mechanisch auftrennbare Schnittstelle (S1, S2) in Form einer Schraubverbindung oder eines Bajonettverschlusses ausgebildet ist.2. Plasma spraying device according to claim 1, characterized in that the mechanically separable interface (S1, S2) is designed in the form of a screw connection or a bayonet catch.
3. Plasmaspritzvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die jeweilige mechanische Schnittstelle (S1, S2) durch eine am einen Leitungsende angeordnete, mit einem Gewinde (35, 36) versehene Überwurfmutter (15, 16) sowie ein am anderen Leitungsende angeordnetes, mit dem Gewinde der Überwurfmutter (15, 16) korrespondierendes Aussengewinde (33, 34) gebildet wird.3. A plasma spraying device according to claim 1 or 2, characterized in that the respective mechanical interface (S1, S2) is arranged by a union nut (15, 16) arranged at one end of the line and provided with a thread (35, 36) and by one at the other end of the line , with the thread of the union nut (15, 16) corresponding external thread (33, 34) is formed.
4. Plasmaspritzvorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass am einen Leitungsende eine Hülse (19, 20) angeordnet ist, die auf der Aussenseite mit dem genannten Aussengewinde (33, 34) versehen ist.4. Plasma spraying device according to claim 3, characterized in that a sleeve (19, 20) is arranged at one line end, which is provided on the outside with the said external thread (33, 34).
5. Plasmaspritzvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Brennerkopf (2) einen Kathodenkörper (3) und einen Anodenkörper (4) aufweist, welche beiden Körper (3, 4) von je einem Kühlkanal (8, 9) durchsetzt sind, wobei jeder Kühlkanal (8, 9) mit je einem Ein- und Auslass versehen ist, in den je ein Leitungsabschnitt (11, 12) mündet, und wobei an jedem Leitungsabschnitt (11 , 12) eine Überwurfmutter (15, 16) fixiert ist. 5. Plasma spraying device according to one of the preceding claims, characterized in that the burner head (2) has a cathode body (3) and an anode body (4), which two bodies (3, 4) are each penetrated by a cooling channel (8, 9) , Each cooling duct (8, 9) is provided with an inlet and an outlet, into each of which a line section (11, 12) opens, and a union nut (15, 16) is fixed on each line section (11, 12) ,
6. Plasmaspritzvorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass der jeweilige Leitungsabschnitt (11 , 12) endseitig mit einem im Durchmesser vergrösserten, hohlzylindrischen Abschnitt (13, 14) versehen ist, der als Anschlag für die Überwurfmutter (15, 16) dient.6. Plasma spraying device according to claim 5, characterized in that the respective line section (11, 12) is provided at the end with an enlarged-diameter, hollow cylindrical section (13, 14) which serves as a stop for the union nut (15, 16).
7. Plasmaspritzvorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass zwischen den Kathodenkörper (3) und den Anodenkörper (4) eine Isolierscheibe (5) eingefügt ist, welche die beiden Körper (3, 4) radial überragt.7. Plasma spraying device according to claim 5 or 6, characterized in that an insulating disk (5) is inserted between the cathode body (3) and the anode body (4), which radially projects beyond the two bodies (3, 4).
8. Plasmaspritzvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Brennerschaft (1) mit einem hohlzylindrischen, dem Brennerkopf (2) zugewandten Vorderteil (1a) versehen ist, in welchen die zum Zuführen der notwendigen Betriebsmittel vorgesehenen Leitungen (17, 18, 28, 29) münden.8. Plasma spraying device according to one of the preceding claims, characterized in that the burner shaft (1) is provided with a hollow cylindrical front part (1a) facing the burner head (2), in which the lines (17, 18,) 28, 29) open.
9. Plasmaspritzvorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass sowohl die Leitungsabschnitte (11, 12) wie auch die wesentlichen Bestandteile der jeweiligen mechanischen Schnittstelle (S1, S2) aus einem elektrisch leitenden Metall, insbesondere aus Kupfer oder Messing gefertigt sind, wobei der jeweilige Leitungsabschnitt (11 , 12) mit dem Kathodenkörper (3) bzw. dem Anodenkörper (4) verlötet ist.9. Plasma spraying device according to claim 3, characterized in that both the line sections (11, 12) and the essential components of the respective mechanical interface (S1, S2) are made of an electrically conductive metal, in particular of copper or brass, the respective Line section (11, 12) is soldered to the cathode body (3) or the anode body (4).
10. Plasmaspritzvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass für die zum Zuführen des Plasmagases und des Beschichtungspulvers vorgesehenen Leitungen (28, 29) eine Steckverbindung zwischen dem Brennerschaft (1) und dem Brennerkopf (2) vorgesehen ist. 10. Plasma spraying device according to one of the preceding claims, characterized in that a plug connection between the burner shaft (1) and the burner head (2) is provided for the lines (28, 29) provided for supplying the plasma gas and the coating powder.
EP04761956A 2003-12-09 2004-10-08 Plasma spraying device Expired - Lifetime EP1692922B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH20962003 2003-12-09
PCT/CH2004/000616 WO2005057994A1 (en) 2003-12-09 2004-10-08 Plasma spraying device

Publications (2)

Publication Number Publication Date
EP1692922A1 true EP1692922A1 (en) 2006-08-23
EP1692922B1 EP1692922B1 (en) 2007-04-25

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EP (1) EP1692922B1 (en)
JP (1) JP2007514283A (en)
AT (1) ATE360975T1 (en)
DE (1) DE502004003646D1 (en)
WO (1) WO2005057994A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102006038134B4 (en) 2006-08-16 2009-08-20 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Plasma burner head, plasma torch and plasma torch
DE102008018530B4 (en) 2008-04-08 2010-04-29 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh A nozzle for a liquid-cooled plasma torch, arrangement of the same and a nozzle cap and liquid-cooled plasma torch with such an arrangement
DE102012003306B4 (en) 2012-02-18 2024-03-21 Amt Ag Plasma coating device

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JPS5849306B2 (en) * 1980-03-12 1983-11-02 株式会社東芝 plasma spray torch
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Also Published As

Publication number Publication date
ATE360975T1 (en) 2007-05-15
JP2007514283A (en) 2007-05-31
WO2005057994A1 (en) 2005-06-23
DE502004003646D1 (en) 2007-06-06
EP1692922B1 (en) 2007-04-25

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