EP3054749B1 - Nozzle for a plasma arc torch - Google Patents

Nozzle for a plasma arc torch Download PDF

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Publication number
EP3054749B1
EP3054749B1 EP15159816.6A EP15159816A EP3054749B1 EP 3054749 B1 EP3054749 B1 EP 3054749B1 EP 15159816 A EP15159816 A EP 15159816A EP 3054749 B1 EP3054749 B1 EP 3054749B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
section
groove
external diameter
rear end
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.)
Active
Application number
EP15159816.6A
Other languages
German (de)
French (fr)
Other versions
EP3054749A1 (en
Inventor
Frank Laurisch
Volker Krink
Timo Grundke
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.)
Kjellberg Stiftung
Original Assignee
Kjellberg Stiftung
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
Priority to SI201531661T priority Critical patent/SI3054749T1/en
Application filed by Kjellberg Stiftung filed Critical Kjellberg Stiftung
Priority to HRP20211108TT priority patent/HRP20211108T8/en
Priority to PL15159816T priority patent/PL3054749T3/en
Priority to PCT/EP2016/051689 priority patent/WO2016124463A1/en
Priority to CA2975533A priority patent/CA2975533A1/en
Priority to BR112017016526-0A priority patent/BR112017016526B1/en
Priority to CN201680019083.6A priority patent/CN107750475B/en
Priority to JP2017541023A priority patent/JP6727731B2/en
Priority to RU2017130947A priority patent/RU2707499C2/en
Priority to US15/548,434 priority patent/US10582606B2/en
Priority to MX2017010081A priority patent/MX2017010081A/en
Priority to KR1020177024734A priority patent/KR102528323B1/en
Priority to CA3194415A priority patent/CA3194415A1/en
Publication of EP3054749A1 publication Critical patent/EP3054749A1/en
Application granted granted Critical
Publication of EP3054749B1 publication Critical patent/EP3054749B1/en
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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
    • 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
    • H05H1/3478—Geometrical details
    • 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

Definitions

  • the present invention relates to nozzles for a liquid-cooled plasma arc torch head, an arrangement of a nozzle holder and a nozzle for a liquid-cooled plasma arc torch head, a plasma arc torch head and a plasma arc torch with the same.
  • a nozzle for a liquid cooled plasma arc torch having a body with an overall axial length, an inner surface and an outer surface, front and rear ends, and a nozzle opening at the front end.
  • the known nozzle has from the rear (from the rear end) first of all a receiving section for receiving the same in a nozzle holder and then a groove in which a round ring can be arranged or is arranged.
  • this can have the disadvantage that if the nozzle is built into a plasma torch head, the space for the cooling liquid, in particular cooling water, is limited towards the nozzle holder and thus the contact area between the cooling liquid and the nozzle is limited towards the rear.
  • Nozzles are also known in which a groove with a circular ring that can be arranged or arranged therein is located directly at the rear end thereof. This in turn has the Disadvantage that the O-ring can be damaged when it is inserted into a nozzle holder for plugging the nozzle into the nozzle holder, for example if, for example, elements such as projections in the nozzle holder, as shown in FIG DE 10 2007 005 316 B4 is described, are available for the defined guidance of the nozzle.
  • DE102008018530 A1 discloses a nozzle for a liquid cooled plasma torch.
  • the present invention is therefore based on the object of designing the known nozzle in such a way that damage to the round ring when inserting a nozzle into a nozzle holder is avoided, or at least reduced, and at the same time a larger area that can come into contact with cooling liquid is provided .
  • a nozzle for a liquid-cooled plasma arc torch head comprising a body with an overall axial length L, an inner surface and an outer surface, a front and a rear end and a nozzle opening at the front end, the outer surface of the body , starting from the rear end, a substantially cylindrical first section with an axial length L1, in which at the rear end of the body a preferably circumferential groove for or with a circular ring arranged in it extends to the rear end of the body a projection is limited which defines an outer diameter D11 of the body, and at the front end a centering surface for a nozzle holder is located, which defines an outer diameter D12 of the body, and has a second section adjoining it towards the front end with an axial length L2, the one ax ial stop surface for the nozzle holder at the boundary to the first section, which defines a third outer diameter D21 of the body, and tapers at least in a partial section to the front end
  • a conically or conically tapering section is meant in particular a section in which, if you connect the rearmost point (edge) of the section with the foremost point (edge) of the section, the line is parallel to the longitudinal axis of the nozzle or with a minimum Deviation of more than ⁇ 15 °.
  • a nozzle for a liquid-cooled plasma arc torch comprising a body with an overall axial length L, an inner surface and an outer surface, a front and a rear end of the body and a nozzle opening at the front end, the outer surface of the Body, starting from the rear end, a substantially cylindrical first section with an axial length L1, in which at the rear end of the body a preferably circumferential groove for or with a circular ring arranged therein, which leads to the rear end of the body is limited by a projection which defines an outer diameter D11 of the body, and a centering surface for a nozzle holder is located at a front end, which defines an outer diameter D12 of the body, and a second portion adjoining it toward the front end of the body with an axial one Length L2, which has an axial stop surface for the nozzle holder at the border to the first section, which defines a third outer diameter D21 of the body, and tapers at least in a partial section to the
  • this object is achieved by an arrangement comprising a nozzle holder and a nozzle according to one of Claims 1 to 16.
  • a liquid-cooled plasma arc torch head comprising a nozzle according to one of Claims 1 to 16 or an arrangement according to one of Claims 17 to 19.
  • the outer diameter D12 is the largest outer diameter of the first section.
  • the third outer diameter D21 is the largest outer diameter of the second section.
  • the largest outside diameter of the first section is advantageously smaller than the largest outside diameter of the second section.
  • At least one further groove is favorably located in the outer surface of the first section.
  • the at least one further groove has a cross-sectional area of at least 3 mm 2 .
  • cross-sectional area is intended to mean the area perpendicular to the longitudinal extent of the groove.
  • the further groove advantageously extends in the circumferential direction of the body.
  • the further groove extends in the circumferential direction of the body over an angle in the range from approximately 20 ° to approximately 360 °.
  • the further groove is limited in the direction of the front end of the body by a front projection running in the circumferential direction of the body, the outer surface of which is formed by the centering surface, and / or the further groove 2.11 in the direction of the rear end of the body through a rear projection extending in the circumferential direction of the body is formed.
  • the front projection defines an outside diameter or a local largest outside diameter of the body and the rear projection defines an outside diameter or a local largest outside diameter, the outside diameter or local largest outside diameter of the front and rear projections being the same or each other differ from each other by a maximum of about 0.2mm.
  • At least one groove and / or bore and / or recess and / or other opening and / or channel is / are advantageously located in the second section of the outer surface, which is / are in fluid connection with the further groove in the first section of the outer surface /stand.
  • a circumferential receiving area for connection to a nozzle holder is advantageously located on the outer surface of the body between the groove for a round ring or with a round ring arranged therein and the further groove.
  • a circumferential receiving area for connection to a nozzle holder is located on the outer surface of the body between the groove for a round ring or with a round ring arranged therein and the further groove,
  • the receiving area expediently has at least one radial projection and / or at least one radial depression.
  • the radial projections and / or Depressions can extend over only a limited angle in the circumferential direction and / or be arranged equidistantly.
  • the nozzle holder has on its connecting side a cylinder wall with an end ring surface that rests against the axial stop face of the nozzle, and with an inner face that rests against the centering face of the nozzle, preferably with little or no play.
  • the nozzle holder advantageously has, on the inner surface of the cylinder wall, a receiving area which is complementary to the receiving area of the nozzle.
  • the present invention provides both a liquid-cooled plasma arc torch head and a liquid-cooled plasma arc torch, each comprising a nozzle according to one of Claims 1 to 16 or an arrangement according to one of Claims 17 to 19.
  • the invention is based on the surprising finding that due to the special design of the outer surface of the nozzle, the groove with the round ring can be arranged as far as possible at the rear end of the nozzle without damaging the round ring, and at the same time a larger area that can come into contact with coolant is provided. In addition, the centering of the nozzle in the. Nozzle holder further improved.
  • the longest possible first section of the body of the nozzle enables good cooling of the transition point between a nozzle holder and the nozzle and good centering of the nozzle in the nozzle holder.
  • Good cooling of the transition point is necessary when igniting the pilot arc, which burns between the electrode and the nozzle of a plasma arc torch. It is also necessary if the plasma arc torch is operated indirectly. In the latter case, the plasma arc often burns with high electrical power or several kW between the electrode and the nozzle. Currents over 100 A can flow here.
  • the nozzle shown for a liquid-cooled plasma arc torch comprises a body 2 with an overall axial length L, i.e. along the longitudinal axis M1, an inner surface 2.20 and an outer surface 2.22, a front end 2.24 and a rear end 2.26 and a nozzle opening 2.28 at the front end 2.24.
  • the body 2 has a groove 2.38 at its front end 2.24.
  • the outer surface 2.22 of the body 2 starting from the rear end 2.26, has an essentially cylindrical first section 2.1 with an axial length L1, in which at the rear end 2.26 of the body 2 there is a circumferentially extending groove 2.10 for a circular ring (not shown), which is limited to the rear end 2.26 of the body 2 by a projection 2.30 which defines an outer diameter D11 of the body 2, and at the front end there is a centering surface A11 for a nozzle holder (not shown) which defines an outer diameter D12 of the body 2.
  • the outer surface has a second section 2.2, directly adjoining the first section 2.1 towards the front end 2.24, with an axial length L2, which has an axial stop surface B11 for a nozzle holder (not shown) at the border to the first section 2.1, which defines an outer diameter D21 of the body 2 and tapers at least in a partial section towards the front end 2.24 of the body in a substantially conical manner.
  • the first section 2.1 of the outer surface 2.22 thus has a particularly large outer surface A13 between the boundary between the first section 2.1 and the second section 2.2 and the groove 2.10, which, when the nozzle is installed in a plasma arc torch head (not shown), has a Cooling liquid can come into contact, whereby the cooling is improved.
  • the outside diameter D12 is the largest outside diameter of the first section 2.1 and the outside diameter D21 is the largest outside diameter of the second section 2.2, the largest outside diameter D12 of the first section 2.1 being smaller than the largest outside diameter D21 of the second section 2.2.
  • channel B13 in the second section 2.2 of the outer surface 2.22, which is in fluid connection with the first section 2.1 of the outer surface 2.22.
  • the channel B13 can also extend at least partially in the first section 2.1.
  • L12 8.2mm
  • L13 2.3mm
  • L1 10.5mm
  • Figure 2 shows a nozzle for a liquid-cooled plasma arc torch head (not shown), which has a body 2 with an overall axial length L, an inner surface 2.20 and an outer surface 2.22, a front end 2.24 and a rear end 2.26 and a nozzle opening 2.28 at the front end 2.24.
  • the body 2 has a groove 2.38 at its front end 2.24.
  • the outer surface 2.22 of the body 2 has an essentially cylindrical first section 2.1 with an axial length L1, in which at the rear end 2.26 of the body 2 there is a circumferentially extending groove 2.10 for a circular ring (not shown) which is limited to the rear end 2.26 of the body by a projection 2.30 which defines an outer diameter D11 of the body 2, and at the front end a centering surface A11 for a nozzle holder (not shown) which defines an outer diameter D12 of the body 2 .
  • the outer surface 2.22 has a second section 2.2, directly adjoining it towards the front end 2.24, with an axial length L2, which has an axial stop surface B11 for a nozzle holder at the border to the first section 2.1, which defines an outer diameter D21 of the body 2, and tapers substantially conically at least in a partial section towards the front end 2.24 of the body 2.
  • the dimensions D12 and D11 the same values and ratios or differences apply as with regard to those in FIG Figure 1 shown nozzle.
  • the further groove 2.11 is limited in the direction of the front end 2.24 of the body 2 by a front projection 2.34 extending in the circumferential direction of the body 2, the outer surface of which is formed by the centering surface A11, and is in The direction of the rear end 2.26 of the body 2 is limited by a rear projection 2.36 running in the circumferential direction of the body 2, the outer surface of which is formed by the surface or centering surface A12.
  • the nozzle shown are the same as for L12 / L13, L12 / L1 and D12 / L1.
  • the front projection 2.34 defines a local largest outer diameter D12 of the body 2 and the rear projection 2.36 defines a local largest outside diameter D12.
  • the local largest outer diameters of the front and rear projections 2.34 and 2.36 are of the same size.
  • the local largest outer diameters of the front and rear projections do not have to be of the same size.
  • the rear projection 2.36 should not be larger than the front projection 2.34. Due to the front and rear projections 2.34 and 2.36 with identical outer diameter D12, there are two contact surfaces in this nozzle which are in contact with a nozzle holder (not shown) when the nozzle is installed. These are the centering surface A11 and the surface or centering surface A12.
  • the second section 2.2 has a groove B12 which is in fluid connection with the further groove 2.11.
  • the groove B12 can also extend at least partially in the first section 2.1.
  • Figure 3 shows a nozzle for a liquid-cooled plasma arc torch with a body 2, which has an overall axial length L, i.e. along the longitudinal axis M1, an inner surface 2.20 and an outer surface 2.22, a front end 2.24 and a rear end 2.26 and a nozzle opening 2.28 at the front end 2.24 having.
  • the outer surface 2.22 of the body 2, starting from the rear end 2.26, has a first section 2.1 with the same features as the first section 2.1 in FIG Figure 2
  • the second section 2.2, in particular the front end 2.24, is designed differently by way of example.
  • the body 2 has 2.24 at the front end in contrast to the body of FIG Figure 2 no groove 2.38.
  • the nozzle built into a plasma arc torch head Figure 3 is in Figure 6 shown.
  • the space between the nozzle and the nozzle cap 3 is sealed by touching the metallic surfaces of the nozzle and the nozzle cap 3.
  • another inner contour of the nozzle or the body is shown by way of example. This nozzle can be used, for example, for indirect operation.
  • FIG. 12 shows a liquid-cooled plasma arc torch head with the nozzle of FIG Figure 1 .
  • the body 2 of the nozzle is fixed in a nozzle holder 7 and is supported by a Nozzle cap 3 fixed.
  • An electrode 1 is arranged in the inner cavity of the body 2.
  • the plasma arc torch head also has a nozzle protection cap 5, which is held by a nozzle protection cap holder 8.
  • a secondary gas duct 6 for secondary gas SG is arranged between the nozzle cap 3 and the nozzle protection cap 5.
  • the secondary gas SG flows through openings (not shown) in the secondary gas duct 6, then through the space between the nozzle cap 3 and nozzle protection cap 5 and finally out of the front opening 5.1 of the nozzle protection cap 5.
  • the nozzle and nozzle cap 3 from one part consist.
  • plasma arc torch heads that are operated without secondary gas. These then usually have no nozzle protection cap, no nozzle protection cap holder and no secondary gas duct.
  • the cooling liquid flows via the cooling liquid flow WV through the nozzle holder 7, flows through the space 10 between the nozzle holder 7 and nozzle, then flows through the channels B13 of the nozzle into the space between the nozzle and the nozzle cap 3 before it flows back through the cooling liquid return WR.
  • the first section 2.1 of the body 2 is inserted into the nozzle holder 7.
  • An axial stop surface B11 of the body 2 meets an axial stop surface B71 of the nozzle holder 7. This determines the positioning of the nozzle or the body 2 along the longitudinal axis M of the plasma arc torch head, the centering surface A11 of the body 2 and the centering surface A71 of the nozzle holder 7 determine the centering of the nozzle or the body 2 in the nozzle holder 7. This arrangement achieves good centering.
  • the cooling liquid flows through the space 10 between the nozzle holder 7 and nozzle or body 2.
  • FIG. 12 shows a liquid-cooled plasma arc torch head with the nozzle of FIG Figure 2 .
  • the body 2 of the nozzle is fastened in a nozzle holder 7 and is fixed by a nozzle cap 3.
  • An electrode 1 is arranged in the inner cavity of the body 2. Between the electrode 1 and the body 2 there is a plasma gas duct 4 for plasma gas PG, which flows through the plasma gas duct 4, then through the space between the electrode 1 and the nozzle and finally out of the nozzle opening 2.28.
  • the plasma arc torch head also has a nozzle protection cap 5, which is held by a nozzle protection cap holder 8.
  • a secondary gas duct 6 for secondary gas SG is arranged between the nozzle cap 3 and the nozzle protection cap 5.
  • the secondary gas SG flows through openings (not shown) in the secondary gas duct 6, then through the space between the nozzle cap 3 and nozzle protection cap 5 and finally out of the front opening 5.1 of the nozzle protection cap 5.
  • the nozzle and nozzle cap 3 from one part consist.
  • plasma arc torch heads that are operated without secondary gas. These then usually have no nozzle protection cap, no nozzle protection cap holder and no secondary gas duct.
  • the coolant flows via the coolant flow WV through the nozzle holder 7, flows through the space 10 between the nozzle holder 7 and the nozzle, through the groove 2.11 and the Centering surface A71 is formed, then flows through the groove B12 of the nozzle or of the body 2, which is in fluid connection with the groove 2.11, into the 2 space between the nozzle and nozzle cap 3, before it flows back through the cooling liquid return WR.
  • the centering is according to the arrangements Figures 5 and 6th even better than in Figure. 4th , since the centering of the nozzle takes place via the surfaces A11 and A12 with the surface A71 of the nozzle holder 7.
  • the contact surface formed in this way between nozzle or body 2 and nozzle holder 7 is larger, which also increases the heat transfer and current transfer between nozzle and nozzle holder 7. There is also no damage to the O-ring 2.42 in the groove 2.10 (see Figure 3 ).

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

Description

Die vorliegende Erfindung betrifft Düsen für einen flüssigkeitsgekühlten Plasmalichtbogenbrennerkopf, eine Anordnung aus einem Düsenhalter und einer Düse für einen flüssigkeitsgekühlten Plasmalichtbogenbrennerkopf, einen Plasmalichtbogenbrennerkopf sowie einen Plasmalichtbogenbrenner mit derselben.The present invention relates to nozzles for a liquid-cooled plasma arc torch head, an arrangement of a nozzle holder and a nozzle for a liquid-cooled plasma arc torch head, a plasma arc torch head and a plasma arc torch with the same.

Aus der DE 10 2009 006 132 B4 ist eine Düse für einen flüssigkeitsgekühlten Plasmalichtbogenbrenner bekannt, die einen Körper mit einer axialen Gesamtlänge, einer Innenfläche und einer Außenfläche, einem vorderen und einem hinteren Ende und einer Düsenöffnung am vorderen Ende aufweist. Die bekannte Düse weist von hinten (vom hinteren Ende) zunächst einen Aufnahmeabschnitt zur Aufnahme derselben in einem Düsenhalter und dann eine Nut, in der ein Rundring angeordnet werden kann bzw. angeordnet ist, auf. In gewissen Fällen kann dies den Nachteil haben, dass, wenn die Düse in einen Plasmabrennerkopf eingebaut ist, der Raum für die Kühlflüssigkeit, insbesondere Kühlwasser, zum Düsenhalter hin und damit der Kontaktbereich zwischen der Kühlflüssigkeit und der Düse nach hinten begrenzt wird.From the DE 10 2009 006 132 B4 There is known a nozzle for a liquid cooled plasma arc torch having a body with an overall axial length, an inner surface and an outer surface, front and rear ends, and a nozzle opening at the front end. The known nozzle has from the rear (from the rear end) first of all a receiving section for receiving the same in a nozzle holder and then a groove in which a round ring can be arranged or is arranged. In certain cases this can have the disadvantage that if the nozzle is built into a plasma torch head, the space for the cooling liquid, in particular cooling water, is limited towards the nozzle holder and thus the contact area between the cooling liquid and the nozzle is limited towards the rear.

Es sind auch Düsen bekannt, bei denen sich eine Nut mit einem darin anordbaren bzw. angeordneten Rundring direkt am hinteren Ende derselben befindet. Dies hat wiederum den Nachteil, dass der Rundring beim Einbringen in einen Düsenhalter zum Stecken der Düse in den Düsenhalter beschädigt werden kann, zum Beispiel wenn im Düsenhalter beispielsweise Elemente wie Vorsprünge, wie dies in der DE 10 2007 005 316 B4 beschrieben ist, zur definierten Führung der Düse vorhanden sind.Nozzles are also known in which a groove with a circular ring that can be arranged or arranged therein is located directly at the rear end thereof. This in turn has the Disadvantage that the O-ring can be damaged when it is inserted into a nozzle holder for plugging the nozzle into the nozzle holder, for example if, for example, elements such as projections in the nozzle holder, as shown in FIG DE 10 2007 005 316 B4 is described, are available for the defined guidance of the nozzle.

DE102008018530 A1 offenbart eine Düse für einen flüssigkeitsgekühlten Plasmabrenner. DE102008018530 A1 discloses a nozzle for a liquid cooled plasma torch.

Der vorliegenden Erfindung liegt somit die Aufgabe zu Grunde, die bekannte Düse derart auszugestalten, dass eine Beschädigung des Rundrings beim Einsetzen einer Düse in einen Düsenhalter vermieden, zumindest aber reduziert wird und gleichzeitig eine größere Fläche, die mit Kühlflüssigkeit in Berührung kommen kann, bereitgestellt wird.The present invention is therefore based on the object of designing the known nozzle in such a way that damage to the round ring when inserting a nozzle into a nozzle holder is avoided, or at least reduced, and at the same time a larger area that can come into contact with cooling liquid is provided .

Erfindungsgemäß wird diese Aufgabe gemäß einem ersten Aspekt gelöst durch eine Düse für einen flüssigkeitsgekühlten Plasmalichtbogenbrennerkopf, umfassend einen Körper mit einer axialen Gesamtlänge L, einer Innenfläche und einer Außenfläche, einem vorderen und einem hinteren Ende und einer Düsenöffnung am vorderen Ende, wobei die Außenfläche des Körpers, ausgehend von dem hinteren Ende, einen im Wesentlichen zylindrischen ersten Abschnitt mit einer axialen Länge L1, in dem sich am hinteren Ende des Körpers eine sich vorzugsweise in Umfangsrichtung erstreckende Nut für einen oder mit einem darin angeordneten Rundring, die zum hinteren Ende des Körpers durch einen Vorsprung begrenzt ist, der einen Außendurchmesser D11 des Körpers definiert, und am vorderen Ende eine Zentrierfläche für einen Düsenhalter befindet, die einen Außendurchmesser D12 des Körpers definiert, und einen sich daran zum vorderen Ende hin anschließenden zweiten Abschnitt mit einer axialen Länge L2 aufweist, der eine axiale Anschlagfläche fürden Düsenhalter an der Grenze zum ersten Abschnitt, die einen dritten Außendurchmesser D21 des Körpers definiert, aufweist und sich zumindest in einem Teilabschnitt zum vorderen Ende des Körpers im Wesentlichen kegelförmig verjüngt, wobei gilt D12 - D11 ≥ 1,5mm und/oder (D12 - D11)/D12≥0,07.According to the invention, this object is achieved according to a first aspect by a nozzle for a liquid-cooled plasma arc torch head, comprising a body with an overall axial length L, an inner surface and an outer surface, a front and a rear end and a nozzle opening at the front end, the outer surface of the body , starting from the rear end, a substantially cylindrical first section with an axial length L1, in which at the rear end of the body a preferably circumferential groove for or with a circular ring arranged in it extends to the rear end of the body a projection is limited which defines an outer diameter D11 of the body, and at the front end a centering surface for a nozzle holder is located, which defines an outer diameter D12 of the body, and has a second section adjoining it towards the front end with an axial length L2, the one ax ial stop surface for the nozzle holder at the boundary to the first section, which defines a third outer diameter D21 of the body, and tapers at least in a partial section to the front end of the body essentially conically, where D12 - D11 ≥ 1.5mm and / or ( D12 - D11) / D12≥0.07.

Mit einem sich kegelig oder konisch verjüngenden Abschnitt soll insbesondere ein Abschnitt gemeint sein, bei dem, wenn man den hintersten Punkt (Kante) des Abschnitts mit dem vordersten Punkt (Kante) des Abschnitts verbindet, die Linie parallel zur Längsachse der Düse oder mit einer minimalen Abweichung von mehr als ± 15° verläuft.With a conically or conically tapering section is meant in particular a section in which, if you connect the rearmost point (edge) of the section with the foremost point (edge) of the section, the line is parallel to the longitudinal axis of the nozzle or with a minimum Deviation of more than ± 15 °.

Weiterhin soll mit einem Außendurchmesser insbesondere folgendes gemeint sein:

  • Der Außendurchmesser, den ein virtueller Kreis mit dem Radius der in einer senkrecht zur Längsachse der Düse gebildeten Ebene zwischen dem Schnittpunkt der Ebene und der Längsachse und dem größten Abstand zur Außenfläche der Düse bilden würde.
  • Es besteht die Möglichkeit, dass in der Ebene eine vollständiger Kreis durch die Außenbegrenzung der Düse gebildet wird, aber auch die Möglichkeit, dass nur ein Teilbereich oder nur einzelne Abschnitte vorhanden sind und der Kreis und auch der Durchmesser nur virtuell bestehen.
  • Es können in der Oberfläche der Düse Nuten oder andere Vertiefungen oder Unterbrechungen vorgesehen sein.
Furthermore, an outside diameter should in particular mean the following:
  • The outer diameter that a virtual circle with the radius of the plane formed in a plane perpendicular to the longitudinal axis of the nozzle between the intersection of the plane and the longitudinal axis and the greatest distance from the outer surface of the nozzle would form.
  • There is the possibility that a complete circle is formed in the plane by the outer boundary of the nozzle, but there is also the possibility that only a partial area or only individual sections are present and the circle and also the diameter only exist virtually.
  • Grooves or other depressions or interruptions can be provided in the surface of the nozzle.

Gemäß einem weiteren Aspekt wird diese Aufgabe gelöst durch eine Düse für einen flüssigkeitsgekühlten Plasmalichtbogenbrenner, umfassend einen Körper mit einer axialen Gesamtlänge L, einer Innenfläche und einer Außenfläche, einem vorderen und einem hinteren Ende des Körpers und einer Düsenöffnung am vorderen Ende, wobei die Außenfläche des Körpers, ausgehend von dem hinteren Ende, einen im Wesentlichen zylindrischen ersten Abschnitt mit einer axialen Länge L1, in dem sich am hinteren Ende des Körpers eine sich vorzugsweise in Umfangsrichtung erstreckende Nut für einen oder mit einem darin angeordneten Rundring, die zum hinteren Ende des Körpers durch einen Vorsprung begrenzt ist, der einen Außendurchmesser D11 des Körpers definiert, und an einem vorderen Ende eine Zentrierfläche für einen Düsenhalter befindet, die einen Außendurchmesser D12 des Körpers definiert, und einen sich daran zum vorderen Ende des Körpers hin anschließenden zweiten Abschnitt mit einer axialen Länge L2 aufweist, der eine axiale Anschlagfläche für den Düsenhalter an der Grenze zum ersten Abschnitt, die einen dritten Außendurchmesser D21 des Körpers definiert, aufweist und sich zumindest in einem Teilabschnitt zum vorderen Ende des Körpers im Wesentlichen kegelförmig verjüngt, wobei für die Länge L12 des Abstands zwischen der axialen Anschlagfläche des zweiten Abschnitts und der nächstliegenden Kantenlinie der Nut und der Länge L13 des Abstands zwischen besagter Kantenlinie und dem hinteren Ende des Körpers gilt L12/L13≥3, bevorzugt ≥3,3 und/oder wobei für die Länge L12 des Abstands zwischen der axialen Anschlagfläche des zweiten Abschnitts und der nächstliegenden Kantenlinie der Nut und der Länge L des ersten Abschnitts gilt L12/L1≥0,75 und besonders bevorzugt L12/L1≥0,77, und/oder wobei gilt D12/L1≤2,3.According to a further aspect, this object is achieved by a nozzle for a liquid-cooled plasma arc torch, comprising a body with an overall axial length L, an inner surface and an outer surface, a front and a rear end of the body and a nozzle opening at the front end, the outer surface of the Body, starting from the rear end, a substantially cylindrical first section with an axial length L1, in which at the rear end of the body a preferably circumferential groove for or with a circular ring arranged therein, which leads to the rear end of the body is limited by a projection which defines an outer diameter D11 of the body, and a centering surface for a nozzle holder is located at a front end, which defines an outer diameter D12 of the body, and a second portion adjoining it toward the front end of the body with an axial one Length L2, which has an axial stop surface for the nozzle holder at the border to the first section, which defines a third outer diameter D21 of the body, and tapers at least in a partial section to the front end of the body essentially conically, for the length L12 of the distance between the axial Stop surface of the second section and the closest edge line of the groove and the length L13 of the distance between said edge line and the rear end of the body applies L12 / L13 3, preferably 3.3 and / or where for the The length L12 of the distance between the axial stop surface of the second section and the closest edge line of the groove and the length L of the first section applies L12 / L1≥0.75 and particularly preferably L12 / L1≥0.77, and / or where D12 / L1 2.3.

Gemäß einem weiteren Aspekt wird diese Aufgabe gelöst durch eine Anordnung aus einem Düsenhalter und einer Düse nach einem der Ansprüche 1 bis 16.According to a further aspect, this object is achieved by an arrangement comprising a nozzle holder and a nozzle according to one of Claims 1 to 16.

Schließlich wird diese Aufgabe auch gelöst durch einen flüssigkeitsgekühlten Plasmalichtbogenbrennerkopf, umfassend eine Düse nach einem der Ansprüche 1 bis 16 oder eine Anordnung nach einem der Ansprüche 17 bis 19.Finally, this object is also achieved by a liquid-cooled plasma arc torch head, comprising a nozzle according to one of Claims 1 to 16 or an arrangement according to one of Claims 17 to 19.

Bei den Düsen kann vorgesehen sein, dass der Außendurchmesser D12 der größte Außendurchmesser des ersten Abschnitts ist.In the case of the nozzles, it can be provided that the outer diameter D12 is the largest outer diameter of the first section.

Weiterhin kann vorgesehen sein, dass der dritte Außendurchmesser D21 der größte Außendurchmesser des zweiten Abschnitts ist.Furthermore, it can be provided that the third outer diameter D21 is the largest outer diameter of the second section.

Vorteilhafterweise ist der größte Außendurchmesser des ersten Abschnitts kleiner als der größte Außendurchmesser des zweiten Abschnitts.The largest outside diameter of the first section is advantageously smaller than the largest outside diameter of the second section.

Günstigerweise befindet sich in der Außenfläche des ersten Abschnitts mindestens eine weitere Nut.At least one further groove is favorably located in the outer surface of the first section.

Insbesondere kann dabei vorgesehen sein, dass die mindestens eine weitere Nut eine Querschnittsfläche von mindestens 3mm2 aufweist. Mit dem Begriff "Querschnittsfläche" soll die Fläche senkrecht zur Längserstreckung der Nut gemeint sein.In particular, it can be provided that the at least one further groove has a cross-sectional area of at least 3 mm 2 . The term "cross-sectional area" is intended to mean the area perpendicular to the longitudinal extent of the groove.

Außerdem erstreckt sich die weitere Nut vorteilhafterweise in der Umfangsrichtung des Körpers.In addition, the further groove advantageously extends in the circumferential direction of the body.

Insbesondere kann dabei vorgesehen sein, dass sich die weitere Nut in der Umfangsrichtung des Körpers über einen Winkel im Bereich von circa 20° bis circa 360° erstreckt.In particular, it can be provided that the further groove extends in the circumferential direction of the body over an angle in the range from approximately 20 ° to approximately 360 °.

Gemäß einer besonderen Ausführungsform ist die weitere Nut in Richtung zum vorderen Ende des Körpers durch einen in Umfangsrichtung des Körpers verlaufenden vorderen Vorsprung, dessen Außenfläche von der Zentrierfläche gebildet ist, begrenzt ist und/oder die weitere Nut 2.11 in Richtung des hinteren Endes des Körpers durch einen in Umfangsrichtung des Körpers verlaufenden hinteren Vorsprung gebildet ist, begrenzt ist.According to a particular embodiment, the further groove is limited in the direction of the front end of the body by a front projection running in the circumferential direction of the body, the outer surface of which is formed by the centering surface, and / or the further groove 2.11 in the direction of the rear end of the body through a rear projection extending in the circumferential direction of the body is formed.

Insbesondere kann dabei vorgesehen sein, dass der vordere Vorsprung einen Außendurchmesser oder einen lokalen größten Außendurchmesser des Körpers definiert und der hintere Vorsprung einen Außendurchmesser oder einen lokalen größten Außendurchmesser definiert, wobei die Außendurchmesser oder lokalen größten Außendurchmesser der vorderen und hinteren Vorsprünge gleich groß sind oder sich um maximal circa 0,2mm voneinander unterscheiden.In particular, it can be provided that the front projection defines an outside diameter or a local largest outside diameter of the body and the rear projection defines an outside diameter or a local largest outside diameter, the outside diameter or local largest outside diameter of the front and rear projections being the same or each other differ from each other by a maximum of about 0.2mm.

Gemäß einer weiteren besonderen Ausführungsform der vorliegenden Erfindung befindet/befinden sich im zweiten Abschnitt der Außenfläche mindestens eine Nut und/oder Bohrung und/oder Vertiefung und/oder andere Öffnung und/oder ein Kanal, die/der mit dem ersten Abschnitt der Außenfläche in Fluidverbindung steht/stehen.According to a further particular embodiment of the present invention, there is / are at least one groove and / or bore and / or recess and / or other opening and / or channel in the second section of the outer surface, which is in fluid connection with the first section of the outer surface stands / stand.

Vorteilhafterweise befindet/befinden sich im zweiten Abschnitt der Außenfläche mindestens eine Nut und/oder Bohrung und/oder Vertiefung und/oder andere Öffnung und/oder ein Kanal befindet/befinden, die/der mit der weiteren Nut im ersten Abschnitt der Außenfläche in Fluidverbindung steht/stehen.At least one groove and / or bore and / or recess and / or other opening and / or channel is / are advantageously located in the second section of the outer surface, which is / are in fluid connection with the further groove in the first section of the outer surface /stand.

Günstigerweise befindet sich auf der Außenfläche des Körpers zwischen der Nut für einen Rundring oder mit einem darin angeordneten Rundring und der weiteren Nut ein umlaufender Aufnahmebereich zur Verbindung mit einem Düsenhalter.A circumferential receiving area for connection to a nozzle holder is advantageously located on the outer surface of the body between the groove for a round ring or with a round ring arranged therein and the further groove.

Alternativ kann vorgesehen sein, dass sich auf der Außenfläche des Körpers zwischen der Nut für einen Rundring oder mit einem darin angeordneten Rundring und der weiteren Nut ein umlaufender Aufnahmebereich zur Verbindung mit einem Düsenhalter befindet,Alternatively, it can be provided that a circumferential receiving area for connection to a nozzle holder is located on the outer surface of the body between the groove for a round ring or with a round ring arranged therein and the further groove,

Zweckmäßigerweise weist der Aufnahmebereich mindestens einen radialen Vorsprung und/oder mindestens eine radiale Vertiefung auf. Die radialen Vorsprünge und/oder Vertiefungen können sich dabei über lediglich einen begrenzten Winkel in Umfangsrichtung erstrecken und/oder äquidistant angeordnet sein.The receiving area expediently has at least one radial projection and / or at least one radial depression. The radial projections and / or Depressions can extend over only a limited angle in the circumferential direction and / or be arranged equidistantly.

Gemäß einer besonderen Ausführungsform der Anordnung, weist der Düsenhalter auf seiner Verbindungsseite eine Zylinderwand mit einer Stirnringfläche, die an der axialen Anschlagfläche der Düse anliegt, und mit einer Innenfläche, die an der Zentrierfläche der Düse vorzugsweise ohne oder mit geringem Spiel anliegt, auf.According to a particular embodiment of the arrangement, the nozzle holder has on its connecting side a cylinder wall with an end ring surface that rests against the axial stop face of the nozzle, and with an inner face that rests against the centering face of the nozzle, preferably with little or no play.

Vorteilhafterweise weist der Düsenhalter auf der Innenfläche der Zylinderwand einen zum Aufnahmebereich der Düse komplementären Aufnahmebereich auf.The nozzle holder advantageously has, on the inner surface of the cylinder wall, a receiving area which is complementary to the receiving area of the nozzle.

Schließlich liefert die vorliegende Erfindung sowohl einen flüssigkeitsgekühlten Plasmalichtbogenbrennerkopf als auch einen flüssigkeitsgekühlten Plasmalichtbogenbrenner, jeweils umfassend eine Düse nach einem der Ansprüche 1 bis 16 oder eine Anordnung nach einem der Ansprüche 17 bis 19.Finally, the present invention provides both a liquid-cooled plasma arc torch head and a liquid-cooled plasma arc torch, each comprising a nozzle according to one of Claims 1 to 16 or an arrangement according to one of Claims 17 to 19.

Der Erfindung liegt die überraschende Erkenntnis zugrunde, dass durch die spezielle Gestaltung der Außenfläche der Düse die Nut mit dem Rundring so weit wie möglich am hinteren Ende der Düse angeordnet werden kann, ohne dass der Rundring dabei beschädigt wird, und gleichzeitig eine größere Fläche, die mit Kühlflüssigkeit in Berührung kommen kann, bereitgestellt wird. Zudem wird die Zentrierung der Düse im. Düsenhalter weiter verbessert.The invention is based on the surprising finding that due to the special design of the outer surface of the nozzle, the groove with the round ring can be arranged as far as possible at the rear end of the nozzle without damaging the round ring, and at the same time a larger area that can come into contact with coolant is provided. In addition, the centering of the nozzle in the. Nozzle holder further improved.

Zum Beispiel ermöglicht ein möglichst langer erster Abschnitt des Körpers der Düse eine gute Kühlung der Übergangsstelle zwischen einem Düsenhalter und der Düse sowie eine gute Zentrierung der Düse in dem Düsenhalter. Eine gute Kühlung der Übergangsstelle ist beim Zünden des Pilotlichtbogens, der zwischen der Elektrode und der Düse eines Plasmalichtbogenbrenners brennt, notwendig. Ebenso ist sie notwendig, wenn der P!asmalichtbogenbrenner indirekt betrieben wird. Im letztgenannten Fall brennt der Plasmalichtbogen oft mit hoher elektrischer Leistung bzw. mehreren kW zwischen der Elektrode und der Düse. Dabei können Ströme über 100 A fließen.For example, the longest possible first section of the body of the nozzle enables good cooling of the transition point between a nozzle holder and the nozzle and good centering of the nozzle in the nozzle holder. Good cooling of the transition point is necessary when igniting the pilot arc, which burns between the electrode and the nozzle of a plasma arc torch. It is also necessary if the plasma arc torch is operated indirectly. In the latter case, the plasma arc often burns with high electrical power or several kW between the electrode and the nozzle. Currents over 100 A can flow here.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus den beigefügten Ansprüchen und der nachfolgenden Beschreibung, in der zwei Ausführungsbeispiele anhand der schematischen Zeichnungen im Einzelnen erläutert werden. Dabei zeigt:

  • Figur 1 eine Schnittansicht (links) und eine Rückansicht (rechts) von einer Düse gemäß einer ersten besonderen Ausführungsform der vorliegenden Erfindung;
  • Figur 2 eine Schnittansicht (links) und eine Rückansicht (rechts) von einer Düse gemäß einer weiteren besonderen Ausführungsform der vorliegenden Erfindung;
  • Figur 3 eine Schnittansicht (links) und eine Rückansicht (rechts) von einer Düse gemäß einer weiteren besonderen Ausführungsform der vorliegenden Erfindung;
  • Figur 4 eine Schnittansicht eines Plasmalichtbogenbrennerkopfes mit der Düse von Figur 1.
  • Figur 5 eine Schnittansicht eines Plasmalichtbogenbrennerkopfes mit der Düse von Figur 2.
  • Figur 6 eine Schnittansicht eines Plasmalichtbogenbrennerkopfes mit der Düse von Figur 3.
Further features and advantages of the invention emerge from the appended claims and the following description, in which two exemplary embodiments are explained in detail with reference to the schematic drawings. It shows:
  • Figure 1 a sectional view (left) and a rear view (right) of a nozzle according to a first particular embodiment of the present invention;
  • Figure 2 a sectional view (left) and a rear view (right) of a nozzle according to a further particular embodiment of the present invention;
  • Figure 3 a sectional view (left) and a rear view (right) of a nozzle according to a further particular embodiment of the present invention;
  • Figure 4 FIG. 3 is a sectional view of a plasma arc torch head with the nozzle of FIG Figure 1 .
  • Figure 5 FIG. 3 is a sectional view of a plasma arc torch head with the nozzle of FIG Figure 2 .
  • Figure 6 FIG. 3 is a sectional view of a plasma arc torch head with the nozzle of FIG Figure 3 .

Die jeweiligen vergrößerten Zeichnungsausschnitte in den Figuren 4 bis 6 zeigen Einzelheiten der Anordnung der Düse und eines Düsenhalters.The respective enlarged drawing excerpts in the Figures 4 to 6 show details of the arrangement of the nozzle and a nozzle holder.

Die in der Figur 1 gezeigte Düse für einen flüssigkeitsgekühlten Plasmalichtbogenbrenner umfasst einen Körper 2 mit einer axialen Gesamtlänge L, das heißt entlang der Längsachse M1, einer Innenfläche 2.20 und einer Außenfläche 2.22, einem vorderen Ende 2.24 und einem hinteren Ende 2.26 und einer Düsenöffnung 2.28 am vorderen Ende 2.24. Zudem weist der Körper 2 an seinem vorderen Ende 2.24 eine Nut 2.38 auf. In der Nut 2.38 befindet sich, wenn die Düse in den Plasmalichtbogenbrenner eingebaut ist, ein Rundring 2.40 (siehe Figur 4 und 5) zur Abdichtung des Raumes zwischen Düse und Düsenkappe 3 (siehe Figur 4 und 5). Die Außenfläche 2.22 des Körpers 2 weist, ausgehend von dem hinteren Ende 2.26, einen im Wesentlichen zylindrischen ersten Abschnitt 2.1 mit einer axialen Länge L1 auf, in dem sich am hinteren Ende 2.26 des Körpers 2 eine sich in Umfangsrichtung erstreckende Nut 2.10 für einen Rundring (nicht gezeigt), die zum hinteren Ende 2.26 des Körpers 2 durch einen Vorsprung 2.30 begrenzt ist, der einen Außendurchmesser D11 des Körpers 2 definiert, und am vorderen Ende eine Zentrierfläche A11 für einen Düsenhalter (nicht gezeigt) befindet, die einen Außendurchmesser D12 des Körpers 2 definiert. Des Weiteren weist die Außenfläche einen sich an den ersten Abschnitt 2.1 zum vorderen Ende 2.24 hin direkt anschließenden zweiten Abschnitt 2.2 mit einer axialen Länge L2 auf, der eine axiale Anschlagfläche B11 für einen Düsenhalter (nicht gezeigt) an der Grenze zum ersten Abschnitt 2.1, die einen Außendurchmesser D21 des Körpers 2 definiert, aufweist und sich zumindest in einem Teilabschnitt zum vorderen Ende 2.24 des Körpers hin im Wesentlichen kegelig verjüngt. Der erste Abschnitt 2.1 der Außenfläche 2.22 weist somit zwischen der Grenze zwischen dem ersten Abschnitt 2.1 und dem zweiten Abschnitt 2.2 und der Nut 2.10 eine insbesondere große Außenfläche A13 auf, die, wenn die Düse in einen Plasmalichtbogenbrennerkopf (nicht gezeigt) eingebaut ist, mit einer Kühlflüssigkeit in Kontakt treten kann, wodurch die Kühlung verbessert wird.The one in the Figure 1 The nozzle shown for a liquid-cooled plasma arc torch comprises a body 2 with an overall axial length L, i.e. along the longitudinal axis M1, an inner surface 2.20 and an outer surface 2.22, a front end 2.24 and a rear end 2.26 and a nozzle opening 2.28 at the front end 2.24. In addition, the body 2 has a groove 2.38 at its front end 2.24. When the nozzle is installed in the plasma arc torch, there is an O-ring 2.40 in the groove 2.38 (see Figure 4 and 5 ) to seal the space between nozzle and nozzle cap 3 (see Figure 4 and 5 ). The outer surface 2.22 of the body 2, starting from the rear end 2.26, has an essentially cylindrical first section 2.1 with an axial length L1, in which at the rear end 2.26 of the body 2 there is a circumferentially extending groove 2.10 for a circular ring ( not shown), which is limited to the rear end 2.26 of the body 2 by a projection 2.30 which defines an outer diameter D11 of the body 2, and at the front end there is a centering surface A11 for a nozzle holder (not shown) which defines an outer diameter D12 of the body 2. Furthermore, the outer surface has a second section 2.2, directly adjoining the first section 2.1 towards the front end 2.24, with an axial length L2, which has an axial stop surface B11 for a nozzle holder (not shown) at the border to the first section 2.1, which defines an outer diameter D21 of the body 2 and tapers at least in a partial section towards the front end 2.24 of the body in a substantially conical manner. The first section 2.1 of the outer surface 2.22 thus has a particularly large outer surface A13 between the boundary between the first section 2.1 and the second section 2.2 and the groove 2.10, which, when the nozzle is installed in a plasma arc torch head (not shown), has a Cooling liquid can come into contact, whereby the cooling is improved.

Da der Durchmesser D12 in dieser Ausführungsform 22,8 mm beträgt und der Durchmesser D11 in dieser Ausführungsform 20,8 mm beträgt, beträgt die Differenz D12-D11=2mm. Zudem ergibt sich für (D12-D11)/(D12)=0,088.Since the diameter D12 in this embodiment is 22.8 mm and the diameter D11 in this embodiment is 20.8 mm, the difference D12-D11 = 2 mm. In addition, (D12-D11) / (D12) = 0.088.

Aus der Figur 1 ergibt sich ferner, dass der Außendurchmesser D12 der größte Außendurchmesser des ersten Abschnitts 2.1 ist und der Außendurchmesser D21 der größte Außendurchmesser des zweiten Abschnitts 2.2 ist, wobei der größte Außendurchmesser D12 des ersten Abschnitts 2.1 kleiner als der größte Außendurchmesser D21 des zweiten Abschnitts 2.2 ist. Zudem ist der Außendurchmesser des Körpers 2 in Figur 1 links (D11) und rechts (D12a) von der Nut 2.10 identisch, das heißt D11=D12a.From the Figure 1 it also results that the outside diameter D12 is the largest outside diameter of the first section 2.1 and the outside diameter D21 is the largest outside diameter of the second section 2.2, the largest outside diameter D12 of the first section 2.1 being smaller than the largest outside diameter D21 of the second section 2.2. In addition, the outer diameter of the body is 2 in Figure 1 the left (D11) and right (D12a) of the groove 2.10 are identical, i.e. D11 = D12a.

Außerdem befindet sich im zweiten Abschnitt 2.2 der Außenfläche 2.22 ein Kanal B13, der mit dem ersten Abschnitt 2.1 der Außenfläche 2.22 in Fluidverbindung steht. Der Kanal B13 kann sich auch zumindest teilweise im ersten Abschnitt 2.1 erstrecken.In addition, there is a channel B13 in the second section 2.2 of the outer surface 2.22, which is in fluid connection with the first section 2.1 of the outer surface 2.22. The channel B13 can also extend at least partially in the first section 2.1.

Mit L12=8,2mm, L13=2,3mm und L1=10,5mmergibt sich für L12/L13=8,2mm/2,3mm=3,565 und L12/L1=0,781 und für D12/L1=2,171.With L12 = 8.2mm, L13 = 2.3mm and L1 = 10.5mm, L12 / L13 = 8.2mm / 2.3mm = 3.565 and L12 / L1 = 0.781 and for D12 / L1 = 2.171.

Figur 2 zeigt eine Düse für einen flüssigkeitsgekühlten Plasmalichtbogenbrennerkopf (nicht gezeigt), die einen Körper 2 mit einer axialen Gesamtlänge L, einer Innenfläche 2.20 und einer Außenfläche 2.22, einem vorderen Ende 2.24 und einem hinteren Ende 2.26 und einer Düsenöffnung 2.28 am vorderen Ende 2.24 umfasst. Zudem weist der Körper 2 an seinem vorderen Ende 2.24 eine Nut 2.38 auf. In der Nut 2.38 befindet sich, wenn die Düse in den Plasmalichtbogenbrenner eingebaut ist, ein Rundring 2.40 (siehe Figur 4 und 5) zur Abdichtung des Raumes zwischen Düse und Düsenkappe 3 (siehe Figur 4 und 5). Die Außenfläche 2.22 des Körpers 2 weist, ausgehend von dem hinteren Ende 2.26, einen im Wesentlichen zylindrischen ersten Abschnitt 2.1 mit einer axialen Länge L1 auf, in dem sich am hinteren Ende 2.26 des Körpers 2 eine sich im Umfangsrichtung erstreckende Nut 2.10 für einen Rundring (nicht gezeigt) die zum hinteren Ende 2.26 des Körpers durch einen Vorsprung 2.30 begrenzt ist, der einen Außendurchmesser D11 des Körpers 2 definiert, und am vorderen Ende eine Zentrierfläche A11 für einen Düsenhalter (nicht gezeigt) befindet, die einen Außendurchmesser D12 des Körpers 2 definiert. Zudem weist die Außenfläche 2.22 einen sich daran zum vorderen Ende 2.24 hin direkt anschließenden zweiten Abschnitt 2.2 mit einer axialen Länge L2 auf, der eine axiale Anschlagfläche B11 für einen Düsenhalter an der Grenze zum ersten Abschnitt 2.1, die einen Außendurchmesser D21 des Körpers 2 definiert, aufweist, und sich zumindest in einem Teilabschnitt zum vorderen Ende 2.24 des Körpers 2 im Wesentlichen kegelig verjüngt. Hinsichtlich der Abmessungen D12 und D11 gelten dieselben Werte und Verhältnisse bzw. Differenzen wie hinsichtlich der in der Figur 1 gezeigten Düse. In der Außenfläche 2.22 des ersten Abschnitts 2.1 befindet sich jedoch eine weitere Nut 2.11. Diese weist vorzugsweise eine Querschnittsfläche von mindestens 3mm2 auf. Zudem erstreckt sie sich vorteilhafterweise in der Umfangsrichtung des Körpers 2. Die weitere Nut 2.11 ist in Richtung zum vorderen Ende 2.24 des Körpers 2 durch einen in Umfangsrichtung des Körpers 2 verlaufenden vorderen Vorsprung 2.34, dessen Außenfläche von der Zentrierfläche A11 gebildet ist, begrenzt und in Richtung des hinteren Endes 2.26 des Körpers 2 durch einen in Umfangsrichtung des Körpers 2 verlaufenden hinteren Vorsprung 2.36 begrenzt, dessen Außenfläche von der Fläche bzw. Zentrierfläche A12 gebildet ist. Für die in der Figur 2 gezeigte Düse gelten dieselben Werte wie für L12/L13, L12/L1 sowie D12/L1. Figure 2 shows a nozzle for a liquid-cooled plasma arc torch head (not shown), which has a body 2 with an overall axial length L, an inner surface 2.20 and an outer surface 2.22, a front end 2.24 and a rear end 2.26 and a nozzle opening 2.28 at the front end 2.24. In addition, the body 2 has a groove 2.38 at its front end 2.24. When the nozzle is installed in the plasma arc torch, there is an O-ring 2.40 in the groove 2.38 (see Figure 4 and 5 ) to seal the space between nozzle and nozzle cap 3 (see Figure 4 and 5 ). Starting from the rear end 2.26, the outer surface 2.22 of the body 2 has an essentially cylindrical first section 2.1 with an axial length L1, in which at the rear end 2.26 of the body 2 there is a circumferentially extending groove 2.10 for a circular ring ( not shown) which is limited to the rear end 2.26 of the body by a projection 2.30 which defines an outer diameter D11 of the body 2, and at the front end a centering surface A11 for a nozzle holder (not shown) which defines an outer diameter D12 of the body 2 . In addition, the outer surface 2.22 has a second section 2.2, directly adjoining it towards the front end 2.24, with an axial length L2, which has an axial stop surface B11 for a nozzle holder at the border to the first section 2.1, which defines an outer diameter D21 of the body 2, and tapers substantially conically at least in a partial section towards the front end 2.24 of the body 2. With regard to the dimensions D12 and D11, the same values and ratios or differences apply as with regard to those in FIG Figure 1 shown nozzle. However, there is another groove 2.11 in the outer surface 2.22 of the first section 2.1. This preferably has a cross-sectional area of at least 3mm 2 . In addition, it advantageously extends in the circumferential direction of the body 2. The further groove 2.11 is limited in the direction of the front end 2.24 of the body 2 by a front projection 2.34 extending in the circumferential direction of the body 2, the outer surface of which is formed by the centering surface A11, and is in The direction of the rear end 2.26 of the body 2 is limited by a rear projection 2.36 running in the circumferential direction of the body 2, the outer surface of which is formed by the surface or centering surface A12. For those in the Figure 2 The nozzle shown are the same as for L12 / L13, L12 / L1 and D12 / L1.

Wie sich ferner aus der Figur 2 ergibt, definiert der vordere Vorsprung 2.34 einen lokalen größten Außendurchmesser D12 des Körpers 2 und definiert der hintere Vorsprung 2.36 einen lokalen größten Außendurchmesser D12. Mit anderen Worten sind in diesem Beispiel die lokalen größten Außendurchmesser der vorderen und hinteren Vorsprünge 2.34 und 2,36 gleich groß. Die lokalen größten Außendurchmesser der vorderen und hinteren Vorsprünge müssen aber nicht gleichgroß sein. In der Regel sollte aber der hintere Vorsprung 2.36 nicht größer als der vordere Vorsprung 2.34 sein. Durch die vorderen und hinteren Vorsprünge 2.34 und 2.36 mit identischem Außendurchmesser D12 bestehen bei dieser Düse zwei Kontaktflächen, die mit einem Düsenhalter (nicht gezeigt) in Kontakt stehen, wenn die Düse eingebaut ist. Es handelt sich um die Zentrierfläche A11 und die Fläche bzw. Zentrierfläche A12.As can also be seen from the Figure 2 results, the front projection 2.34 defines a local largest outer diameter D12 of the body 2 and the rear projection 2.36 defines a local largest outside diameter D12. In other words, in this example, the local largest outer diameters of the front and rear projections 2.34 and 2.36 are of the same size. However, the local largest outer diameters of the front and rear projections do not have to be of the same size. As a rule, however, the rear projection 2.36 should not be larger than the front projection 2.34. Due to the front and rear projections 2.34 and 2.36 with identical outer diameter D12, there are two contact surfaces in this nozzle which are in contact with a nozzle holder (not shown) when the nozzle is installed. These are the centering surface A11 and the surface or centering surface A12.

Wie sich ebenfalls aus der Figur 2 ergibt, weist der zweite Abschnitt 2.2 eine Nut B12 auf, die mit der weiteren Nut 2.11 in Fluidverbindung steht. Die Nut B12 kann sich auch zumindest teilweise im ersten Abschnitt 2.1 erstrecken.As can also be seen from the Figure 2 results, the second section 2.2 has a groove B12 which is in fluid connection with the further groove 2.11. The groove B12 can also extend at least partially in the first section 2.1.

Figur 3 zeigt eine Düse für einen flüssigkeitsgekühlten Plasmalichtbogenbrenner mit einem Körper 2, der eine axiale Gesamtlänge L, das heißt entlang der Längsachse M1, eine Innenfläche 2.20 und eine Außenfläche 2.22, ein vorderes Ende 2.24 und ein hinteres Ende 2.26 sowie eine Düsenöffnung 2.28 am vorderen Ende 2.24 aufweist. Die Außenfläche 2.22 des Körpers 2 weist, ausgehend von dem hinteren Ende 2.26, einen ersten Abschnitt 2.1 mit den gleichen Merkmalen wie der erste Abschnitt 2.1 der in der Figur 2 gezeigten Düse und einen sich an den ersten Abschnitt 2.1 zum vorderen Ende 2.24 hin direkt anschließenden zweiten Abschnitt 2.2 mit einer axialen Länge L2 auf. Der zweite Abschnitt 2.2, insbesondere das vordere Ende 2.24 ist beispielhaft anders gestaltet. Der Körper 2 hat am vorderen Ende 2.24 im Gegensatz zum Körper von Figur 2 keine Nut 2.38. Die in einen Plasmalichtbogenbrennerkopf eingebaute Düse aus Figur 3 ist in Figur 6 gezeigt. Hier erfolgt die Abdichtung des Raumes zwischen Düse und Düsenkappe 3 durch eine Berührung der metallischen Oberflächen der Düse und der Düsenkappe 3. Weiterhin ist eine andere Innenkontur der Düse bzw. des Körpers beispielhaft gezeigt. Dies Düse kann beispielweise für die indirekte Betriebsweise eingesetzt werden. Figure 3 shows a nozzle for a liquid-cooled plasma arc torch with a body 2, which has an overall axial length L, i.e. along the longitudinal axis M1, an inner surface 2.20 and an outer surface 2.22, a front end 2.24 and a rear end 2.26 and a nozzle opening 2.28 at the front end 2.24 having. The outer surface 2.22 of the body 2, starting from the rear end 2.26, has a first section 2.1 with the same features as the first section 2.1 in FIG Figure 2 The nozzle shown and a second section 2.2 directly adjoining the first section 2.1 towards the front end 2.24 and having an axial length L2. The second section 2.2, in particular the front end 2.24, is designed differently by way of example. The body 2 has 2.24 at the front end in contrast to the body of FIG Figure 2 no groove 2.38. The nozzle built into a plasma arc torch head Figure 3 is in Figure 6 shown. Here, the space between the nozzle and the nozzle cap 3 is sealed by touching the metallic surfaces of the nozzle and the nozzle cap 3. Furthermore, another inner contour of the nozzle or the body is shown by way of example. This nozzle can be used, for example, for indirect operation.

Figur 4 zeigt einen flüssigkeitsgekühlten Plasmalichtbogenbrennerkopf mit der Düse von Figur 1. Der Körper 2 der Düse ist in einem Düsenhalter 7 befestigt und wird durch eine Düsenkappe 3 fixiert. Im inneren Hohlraum des Körpers 2 ist eine Elektrode 1 angeordnet. Zwischen der Elektrode 1 und dem Körper 2 befindet sich eine Plasmagasführung 4 für Plasmagas PG, das durch die Plasmagasführung 4, dann durch den Raum zwischen Elektrode 1 und Düse und letztlich aus der Düsenöffnung 2.28 strömt. Der Plasmalichtbogenbrennerkopf verfügt weiterhin über eine Düsenschutzkappe 5, die von einer Düsenschutzkappenhalterung 8 gehalten wird. Zwischen der Düsenkappe 3 und der Düsenschutzkappe 5 ist eine Sekundärgasführung 6 für Sekundärgas SG angeordnet. Das Sekundärgas SG strömt durch Öffnungen (nicht dargestellt) der Sekundärgasführung 6, dann durch den Raum zwischen Düsenkappe 3 und Düsenschutzkappe 5 und letztlich aus der vorderen Öffnung 5.1 der Düsenschutzkappe 5. Es gibt auch die Möglichkeit, dass die Düse und Düsenkappe 3 aus einem Teil bestehen. Ebenso gibt es Plasmalichtbogenbrennerköpfe, die ohne Sekundärgas betrieben werden. Diese haben dann in der Regel keine Düsenschutzkappe, keine Düsenschutzkappenhalterung und keine Sekundärgasführung. Figure 4 FIG. 12 shows a liquid-cooled plasma arc torch head with the nozzle of FIG Figure 1 . The body 2 of the nozzle is fixed in a nozzle holder 7 and is supported by a Nozzle cap 3 fixed. An electrode 1 is arranged in the inner cavity of the body 2. Between the electrode 1 and the body 2 there is a plasma gas duct 4 for plasma gas PG, which flows through the plasma gas duct 4, then through the space between the electrode 1 and the nozzle and finally out of the nozzle opening 2.28. The plasma arc torch head also has a nozzle protection cap 5, which is held by a nozzle protection cap holder 8. A secondary gas duct 6 for secondary gas SG is arranged between the nozzle cap 3 and the nozzle protection cap 5. The secondary gas SG flows through openings (not shown) in the secondary gas duct 6, then through the space between the nozzle cap 3 and nozzle protection cap 5 and finally out of the front opening 5.1 of the nozzle protection cap 5. There is also the option of the nozzle and nozzle cap 3 from one part consist. There are also plasma arc torch heads that are operated without secondary gas. These then usually have no nozzle protection cap, no nozzle protection cap holder and no secondary gas duct.

Die Kühlflüssigkeit strömt über den Kühlflüssigkeitsvorlauf WV durch den Düsenhalter 7, durchströmt den Raum 10 zwischen Düsenhalter 7 und Düse, strömt dann durch die Kanäle B13 der Düse in den Raum zwischen Düse und Düsenkappe 3, bevor sie durch den Kühlflüssigkeitsrücklauf WR wieder zurück strömt.The cooling liquid flows via the cooling liquid flow WV through the nozzle holder 7, flows through the space 10 between the nozzle holder 7 and nozzle, then flows through the channels B13 of the nozzle into the space between the nozzle and the nozzle cap 3 before it flows back through the cooling liquid return WR.

Der erste Abschnitt 2.1 des Körpers 2 ist in den Düsenhalter 7 eingesetzt. Dabei trifft eine axiale Anschlagfläche B11 des Körpers 2 auf eine axiale Anschlagfläche B71 des Düsenhalters 7. Damit wird die Positionierung der Düse bzw. des Körpers 2 entlang der Längsachse M des Plasmalichtbogenbrennerkopfes bestimmt, Die Zentrierfläche A11 des Körpers 2 und die Zentrierfläche A71 des Düsenhalter 7 bestimmen die Zentrierung der Düse bzw. des Körpers 2 im Düsenhalter 7. Durch diese Anordnung wird eine gute Zentrierung erreicht. Wie bereits beschrieben, durchströmt die Kühlflüssigkeit den Raum 10 zwischen Düsenhalter 7 und Düse bzw. Körpers 2. Dieser Raum wird hier durch die Flächen A71 des Düsenhalters 7 und A13 der Düse sowie den Rundring 2.42 in der Nut 2.10 und die Anschlagsflächen B11 und B71 begrenzt und umgibt hier den gesamten Außenumfang dieses Düsenabschnitts. Dadurch steht die große Außenfläche A13 der Düse mit der Kühlflüssigkeit in Kontakt, wodurch die Kühlung verbessert wird. Hier wird auch deutlich, dass durch die erfindungsgemäße Lösung eine Beschädigung des Rundringes 2.42 in Nut 2.10 vermieden wird. Dies ist insbesondere wichtig, wenn sich auf der Zentrierfläche A71 beispielsweise Vorsprünge befinden.The first section 2.1 of the body 2 is inserted into the nozzle holder 7. An axial stop surface B11 of the body 2 meets an axial stop surface B71 of the nozzle holder 7. This determines the positioning of the nozzle or the body 2 along the longitudinal axis M of the plasma arc torch head, the centering surface A11 of the body 2 and the centering surface A71 of the nozzle holder 7 determine the centering of the nozzle or the body 2 in the nozzle holder 7. This arrangement achieves good centering. As already described, the cooling liquid flows through the space 10 between the nozzle holder 7 and nozzle or body 2. This space is limited here by the surfaces A71 of the nozzle holder 7 and A13 of the nozzle and the O-ring 2.42 in the groove 2.10 and the stop surfaces B11 and B71 and here surrounds the entire outer circumference of this nozzle section. As a result, the large outer surface A13 of the nozzle is in contact with the cooling liquid, which improves cooling. It is also clear here that the solution according to the invention avoids damage to the circular ring 2.42 in the groove 2.10 becomes. This is particularly important if there are projections, for example, on the centering surface A71.

Figur 5 zeigt einen flüssigkeitsgekühlten Plasmalichtbogenbrennerkopf mit der Düse von Figur 2. Figure 5 FIG. 12 shows a liquid-cooled plasma arc torch head with the nozzle of FIG Figure 2 .

Der Körper 2 der Düse ist in einem Düsenhalter 7 befestigt und wird durch eine Düsenkappe 3 fixiert. Im inneren Hohlraum des Körpers 2 ist eine Elektrode 1 angeordnet. Zwischen der Elektrode 1 und dem Körper 2 befindet sich eine Plasmagasführung 4 für Plasmagas PG, das durch die Plasmagasführung 4, dann durch den Raum zwischen Elektrode 1 und Düse und letztlich aus der Düsenöffnung 2.28 strömt. Der Plasmalichtbogenbrennerkopf verfügt weiterhin über eine Düsenschutzkappe 5, die von einer Düsenschutzkappenhalterung 8 gehalten wird. Zwischen der Düsenkappe 3 und der Düsenschutzkappe 5 ist eine Sekundärgasführung 6 für Sekundärgas SG angeordnet. Das Sekundärgas SG strömt durch Öffnungen (nicht dargestellt) der Sekundärgasführung 6, dann durch den Raum zwischen Düsenkappe 3 und Düsenschutzkappe 5 und letztlich aus der vorderen Öffnung 5.1 der Düsenschutzkappe 5. Es gibt auch die Möglichkeit, dass die Düse und Düsenkappe 3 aus einem Teil bestehen. Ebenso gibt es Plasmalichtbogenbrennerköpfe, die ohne Sekundärgas betrieben werden. Diese haben dann in der Regel keine Düsenschutzkappe, keine Düsenschutzkappenhalterung und keine Sekundärgasführung.The body 2 of the nozzle is fastened in a nozzle holder 7 and is fixed by a nozzle cap 3. An electrode 1 is arranged in the inner cavity of the body 2. Between the electrode 1 and the body 2 there is a plasma gas duct 4 for plasma gas PG, which flows through the plasma gas duct 4, then through the space between the electrode 1 and the nozzle and finally out of the nozzle opening 2.28. The plasma arc torch head also has a nozzle protection cap 5, which is held by a nozzle protection cap holder 8. A secondary gas duct 6 for secondary gas SG is arranged between the nozzle cap 3 and the nozzle protection cap 5. The secondary gas SG flows through openings (not shown) in the secondary gas duct 6, then through the space between the nozzle cap 3 and nozzle protection cap 5 and finally out of the front opening 5.1 of the nozzle protection cap 5. There is also the option of the nozzle and nozzle cap 3 from one part consist. There are also plasma arc torch heads that are operated without secondary gas. These then usually have no nozzle protection cap, no nozzle protection cap holder and no secondary gas duct.

Wie auch im Zusammenhang mit der Figur 3 erörtert wurde, weist die in dem Plasmalichtbogenbrennerkopf der Figur 6 verwendete Düse Ähnlichkeit mit der Düse von Figur 2 auf, aber gibt es auch Unterschiede, und zwar in diesem Beispiel hinsichtlich der Dichtung im vorderen Bereich. Es gibt weder eine Nut 2.38 noch einen darin eingesetzten Rundring 2.40 wie bei der Düse von Figur 2 bzw. 5. Da auch eine indirekte Betriebsweise möglich ist, ist ein Strom- und Wärmeübergang im Kontaktbereich zwischen der Düse und der Düsenkappe besonders wichtig wegen möglicher hoher Ströme, die üblicherweise größer als 100A sind.As in connection with the Figure 3 has been discussed, has the in the plasma arc torch head of the Figure 6 used nozzle resemblance to the nozzle of Figure 2 but there are also differences, in this example with regard to the seal in the front area. There is neither a groove 2.38 nor an O-ring 2.40 inserted in it as in the nozzle from Figure 2 or 5. Since an indirect mode of operation is also possible, a current and heat transfer in the contact area between the nozzle and the nozzle cap is particularly important because of possible high currents, which are usually greater than 100A.

Die Kühlflüssigkeit strömt über den Kühlflüssigkeitsvorlauf WV durch den Düsenhalter 7, durchströmt den Raum 10 zwischen Düsenhalter 7 und Düse, der durch die Nut 2.11 und die Zentrierfläche A71 gebildet wird, strömt dann durch die Nut B12 der Düse bzw. des Körpers 2, die mit der Nut 2.11 in Fluidverbindung steht in den 2 Raum zwischen Düse und Düsenkappe 3, bevor es durch den Kühlflüssigkeitsrücklauf WR wieder zurück strömt.The coolant flows via the coolant flow WV through the nozzle holder 7, flows through the space 10 between the nozzle holder 7 and the nozzle, through the groove 2.11 and the Centering surface A71 is formed, then flows through the groove B12 of the nozzle or of the body 2, which is in fluid connection with the groove 2.11, into the 2 space between the nozzle and nozzle cap 3, before it flows back through the cooling liquid return WR.

Die Zentrierung ist bei den Anordnungen gemäß Figuren 5 und 6 noch besser als in Figur. 4, da die Zentrierung der Düse über die Flächen A11 und A12 mit der Fläche A71 des Düsenhalters 7 erfolgt. Die so gebildete Kontaktfläche zwischen Düse bzw. Körper 2 und Düsenhalter 7 ist größer, was zusätzlich auch den Wärmeübergang und auch Stromübergang zwischen Düse und Düsenhalter 7. Ebenso erfolgt keine Beschädigung des Rundrings 2.42 in der Nut 2.10 (siehe Figur 3).The centering is according to the arrangements Figures 5 and 6th even better than in Figure. 4th , since the centering of the nozzle takes place via the surfaces A11 and A12 with the surface A71 of the nozzle holder 7. The contact surface formed in this way between nozzle or body 2 and nozzle holder 7 is larger, which also increases the heat transfer and current transfer between nozzle and nozzle holder 7. There is also no damage to the O-ring 2.42 in the groove 2.10 (see Figure 3 ).

Der Umfang der Erfindung wird durch die Ansprüche definiert.The scope of the invention is defined by the claims.

BezugszeichenlisteList of reference symbols

11
Elektrodeelectrode
22
Körperbody
2.12.1
erster Abschnittfirst section
2.102.10
NutGroove
2.22.2
zweiter Abschnittsecond part
2.202.20
InnenflächeInner surface
2.222.22
AußenflächeExterior surface
2.242.24
vorderes Endefront end
2.262.26
hinteres Enderear end
2.282.28
DüsenöffnungNozzle opening
2.302.30
Vorsprunghead Start
2.322.32
KantenlinieEdge line
2.342.34
vorderer Vorsprungfront ledge
2.362.36
hinterer Vorsprungrear ledge
2.382.38
NutGroove
2.402.40
RundringRound ring
2.422.42
RundringRound ring
33
DüsenkappeNozzle cap
44th
PlasmagasführungPlasma gas supply
55
DüsenschutzkappeNozzle protection cap
66th
SekundärgasführungSecondary gas supply
77th
DüsenhalterNozzle holder
88th
DüsenschutzkappenhalterNozzle protection cap holder
1010
Raumroom
A11A11
ZentrierflächeCentering surface
A12A12
Flächesurface
A13A13
AußenflächeExterior surface
A71A71
ZentrierflächeCentering surface
B11B11
axiale Anschlagflächeaxial stop surface
B12B12
NutGroove
B13B13
Kanälechannels
B71B71
axiale Anschlagflächeaxial stop surface
D11D11
Außendurchmesserouter diameter
D12D12
Außendurchmesserouter diameter
D12aD12a
Außendurchmesserouter diameter
D13D13
Durchmesserdiameter
D21D21
Außendurchmesserouter diameter
LL.
axiale Gesamtlängetotal axial length
L1L1
axiale Längeaxial length
L2L2
axiale Längeaxial length
L12L12
Längelength
L13L13
Längelength
L14L14
Längelength
MM.
LängsachseLongitudinal axis
M1M1
LängsachseLongitudinal axis
WRWR
KühlflüssigkeitsrücklaufCoolant return
WVWV
KühlflüssigkehsvorlaufCoolant flow

Claims (21)

  1. Nozzle for a liquid-cooled plasma arc torch head, comprising:
    a body (2) with an axial overall length L, an inner surface (2.20) and an outer surface (2.22), a front (2.24) and a rear end (2.26) and a nozzle opening (2.28) at the front end (2.24),
    wherein the outer surface (2.22) of the body (2), starting from the rear end (2.26), has a substantially cylindrical first section (2.1) with an axial length L1, in which, at the rear end (2.26) of the body (2), a groove (2.10) preferably extending in the circumferential direction for an annular ring (2.42) or having one arranged therein, which is delimited towards the rear end (2.26) of the body (2) by a projection (2.30) which defines a first external diameter D11 of the body (2) and, at the front end, there is a centring surface (All) for a nozzle holder (7), which defines a second external diameter D12 of the body (2), and a second section (2.2) adjoining it towards the front end (2.24) has an axial length L2, which has an axial stop surface (B11) for the nozzle holder (7) at the boundary to the first section (2.1), which defines a third external diameter (D21) of the body (2) and, at least in a subsection, tapers substantially conically towards the front end (2.24) of the body (2),
    characterized in that D 12 − D 11 ≥ 1.5 mm ,
    Figure imgb0004
     and/or D 12 − D 11 / D 12 ≥ 0.07 .
    Figure imgb0005
  2. Nozzle for a liquid-cooled plasma arc torch head, comprising:
    a body (2) with an axial overall length L, an inner surface (2.20) and an outer surface (2.22), a front (2.24) and a rear end (2.26) and a nozzle opening (2.28) at the front end (2.24),
    wherein the outer surface (2.22) of the body (2), starting from the rear end (2.26) of the body (2), has a substantially cylindrical first section (2.1) with an axial length L1, in which, at the rear end (2.26) of the body (2), a groove (2.10) preferably extending in the circumferential direction for an annular ring (2.42) or having one arranged therein, which is delimited towards the rear end (2.26) of the body (2) by a projection (2.30) which defines a first external diameter D11 of the body (2) and, at the front end, there is a centring surface (All) for a nozzle holder (7), which defines a second external diameter D12 of the body (2), and a second section (2.2) adjoining it towards the front end (2.24) of the body (2) has an axial length L2, which has an axial stop surface (B11) for the nozzle holder (7) at the boundary to the first section (2.1), which defines a third external diameter (D21) of the body (2) and, at least in a subsection, tapers substantially conically towards the front end (2.26) of the body (2),
    characterized in that
    for the length L12 of the distance between the axial stop surface (B11) of the second section (2.2) and the closest edge line (2.32) of the groove (2.10) and the length L13 of the distance between the aforesaid edge line (2.32) and the rear end (2.26) of the body (2),
    L12/L13 ≥ 3, particularly preferably L12/L13 ≥ 3.3,
    and/or
    in that for the length L12 of the distance between the axial stop surface (B11) of the second section (2.2) and the closest edge line (2.32) of the groove (2.10) and the length L1 of the first section (2.1),
    L12/L1 ≥ 0.75 and particularly preferably L12/L1 ≥ 0.77,
    and/or
    where D12/L1 ≤ 2.3.
  3. Nozzle according to Claim 1 or 2, characterized in that the second external diameter D12 is the largest external diameter of the first section (2.1).
  4. Nozzle according to one of Claims 1 to 3, characterized in that the third external diameter (D21) is the largest external diameter of the second section (2.2) .
  5. Nozzle according to one of the preceding claims, characterized in that the largest external diameter of the first section (2.1) is smaller than the largest external diameter of the second section (2.2).
  6. Nozzle according to one of the preceding claims, characterized in that there is at least one further groove (2.11) in the outer surface (2.22) of the first section (2.1).
  7. Nozzle according to Claim 6, characterized in that the at least one further groove (2.11) has a cross-sectional area of at least 3 mm2.
  8. Nozzle according to Claim 6 or 7, characterized in that the further groove (2.11) extends in the circumferential direction of the body (2).
  9. Nozzle according to one of Claims 6 to 8, characterized in that the further groove (2.11) extends in the circumferential direction of the body (2) over an angle in the range from about 20° to about 360°.
  10. Nozzle according to one of Claims 6 to 9, characterized in that the further groove (2.11) is delimited in the direction of the front end (2.24) of the body (2) by a front projection (2.34) which extends in the circumferential direction of the body (2) and the outer surface of which is formed by the centring surface (A11), and/or the further groove (2.11) is delimited in the direction of the rear end (2.26) of the body (2) by a rear projection (2.36) which extends in the circumferential direction of the body (2).
  11. Nozzle according to Claim 10, characterized in that the front projection (2.34) defines an external diameter or local largest external diameter of the body (2), and the rear projection (2.36) defines an external diameter or a local largest external diameter, wherein the external diameters or local largest external diameters of the front (2.34) and rear projections (2.36) are equally large or differ from each other by a maximum of about 0.2 mm.
  12. Nozzle according to one of the preceding claims, characterized in that in the second section (2.2) of the outer surface (2.22) there is/are at least one groove and/or hole and/or depression and/or other opening and/or a channel, which has/have a fluid connection to the first section (2.1) of the outer surface (2.22).
  13. Nozzle according to one of Claims 6 to 12, characterized in that in the second section (2.2) of the outer surface (2.22) there is/are at least one groove and/or hole and/or depression and/or other opening and/or a channel, which has/have a fluid connection to the further groove (2.11) in the first section (2.1) of the outer surface (2.22).
  14. Nozzle according to one of Claims 1 to 5, characterized in that on the outer surface (2.22) of the body (2) between the groove (2.10) for an annular ring or having an annular ring arranged therein and the axial stop surface (B11), there is a circumferential holding region for connection to a nozzle holder.
  15. Nozzle according to one of Claims 6 to 13, characterized in that on the outer surface (2.22) of the body (2) between the groove (2.10) for an annular ring or having an annular ring arranged therein and the further groove (2.11), there is a circumferential holding region for connection to a nozzle holder.
  16. Nozzle according to Claim 14 or 15, characterized in that the holding region has at least one radial projection and/or at least one radial depression.
  17. Arrangement of a nozzle holder and a nozzle according to one of the preceding claims.
  18. Arrangement according to Claim 17, characterized in that the nozzle holder has on its connecting side a cylindrical wall with a front annular surface which rests on the axial stop surface (B11) of the nozzle, and with an inner surface which rests on the centring surface (All) of the nozzle, preferably without or with little play.
  19. Arrangement according to Claim 17 or 18, characterized in that on the inner surface of the cylindrical wall, the nozzle holder has a holding region that is complementary to the holding region of the nozzle.
  20. Liquid-cooled plasma arc torch head, comprising a nozzle according to one of Claims 1 to 16 or an arrangement according to one of Claims 17 to 19.
  21. Liquid-cooled plasma arc torch, comprising a nozzle according to one of Claims 1 to 16 or an arrangement according to one of Claims 17 to 19.
EP15159816.6A 2015-02-03 2015-03-19 Nozzle for a plasma arc torch Active EP3054749B1 (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
HRP20211108TT HRP20211108T8 (en) 2015-02-03 2015-03-19 Nozzle for a plasma arc torch
PL15159816T PL3054749T3 (en) 2015-02-03 2015-03-19 Nozzle for a plasma arc torch
SI201531661T SI3054749T1 (en) 2015-02-03 2015-03-19 Nozzle for a plasma arc torch
JP2017541023A JP6727731B2 (en) 2015-02-03 2016-01-27 Nozzle for plasma arc torch
BR112017016526-0A BR112017016526B1 (en) 2015-02-03 2016-01-27 NOZZLE FOR A LIQUID COOLED PLASMA ARC TORCH, ARRANGEMENT OF A NOZZLE HOLDER AND A NOZZLE, LIQUID COOLED PLASMA ARC TORCH HEAD AND LIQUID COOLED PLASMA ARC TORCH
CN201680019083.6A CN107750475B (en) 2015-02-03 2016-01-27 Nozzle for plasma arc burner
PCT/EP2016/051689 WO2016124463A1 (en) 2015-02-03 2016-01-27 Nozzle for a plasma arc torch
RU2017130947A RU2707499C2 (en) 2015-02-03 2016-01-27 Nozzle for plasma arc burner
US15/548,434 US10582606B2 (en) 2015-02-03 2016-01-27 Nozzle for a plasma arc torch
MX2017010081A MX2017010081A (en) 2015-02-03 2016-01-27 Nozzle for a plasma arc torch.
KR1020177024734A KR102528323B1 (en) 2015-02-03 2016-01-27 Nozzle for Plasma Arc Torch
CA3194415A CA3194415A1 (en) 2015-02-03 2016-01-27 Nozzle for a plasma arc torch
CA2975533A CA2975533A1 (en) 2015-02-03 2016-01-27 Nozzle for a plasma arc torch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015101532.3A DE102015101532A1 (en) 2015-02-03 2015-02-03 Nozzle for plasma arc torch

Publications (2)

Publication Number Publication Date
EP3054749A1 EP3054749A1 (en) 2016-08-10
EP3054749B1 true EP3054749B1 (en) 2021-04-21

Family

ID=52686241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15159816.6A Active EP3054749B1 (en) 2015-02-03 2015-03-19 Nozzle for a plasma arc torch

Country Status (18)

Country Link
US (1) US10582606B2 (en)
EP (1) EP3054749B1 (en)
JP (1) JP6727731B2 (en)
KR (1) KR102528323B1 (en)
CN (1) CN107750475B (en)
BR (1) BR112017016526B1 (en)
CA (2) CA2975533A1 (en)
DE (1) DE102015101532A1 (en)
DK (1) DK3054749T3 (en)
ES (1) ES2874902T3 (en)
HR (1) HRP20211108T8 (en)
HU (1) HUE055588T2 (en)
MX (1) MX2017010081A (en)
PL (1) PL3054749T3 (en)
PT (1) PT3054749T (en)
RU (1) RU2707499C2 (en)
SI (1) SI3054749T1 (en)
WO (1) WO2016124463A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ308964B6 (en) * 2018-09-30 2021-10-20 B&Bartoni, spol. s r.o. Nozzle assembly with adapter for use in a liquid-cooled two-gas plasma torch

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US6946617B2 (en) * 2003-04-11 2005-09-20 Hypertherm, Inc. Method and apparatus for alignment of components of a plasma arc torch
JP2005118816A (en) * 2003-10-16 2005-05-12 Koike Sanso Kogyo Co Ltd Nozzle for plasma torch
BRPI0610299B1 (en) * 2005-04-19 2018-01-30 Hypertherm, Inc. PLASMA BOW TURNER PROVIDING ANGULAR FLOW ANGLE INJECTION
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US9737954B2 (en) * 2012-04-04 2017-08-22 Hypertherm, Inc. Automatically sensing consumable components in thermal processing systems
CN102744507A (en) * 2012-08-13 2012-10-24 常州机电职业技术学院 Plasma cutting torch nozzle
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CN203316895U (en) * 2013-05-09 2013-12-04 上海瑞能焊割有限公司 Plasma cutting nozzle

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Also Published As

Publication number Publication date
BR112017016526A2 (en) 2018-04-10
SI3054749T1 (en) 2021-12-31
ES2874902T3 (en) 2021-11-05
CA3194415A1 (en) 2016-08-11
HRP20211108T1 (en) 2021-10-15
RU2017130947A (en) 2019-03-04
KR20170134347A (en) 2017-12-06
DK3054749T3 (en) 2021-06-28
PT3054749T (en) 2021-05-28
US10582606B2 (en) 2020-03-03
JP6727731B2 (en) 2020-07-22
CN107750475A (en) 2018-03-02
WO2016124463A1 (en) 2016-08-11
PL3054749T3 (en) 2021-10-25
HUE055588T2 (en) 2021-12-28
DE102015101532A1 (en) 2016-08-04
RU2017130947A3 (en) 2019-06-21
EP3054749A1 (en) 2016-08-10
CN107750475B (en) 2020-12-11
CA2975533A1 (en) 2016-08-11
US20180020533A1 (en) 2018-01-18
RU2707499C2 (en) 2019-11-27
BR112017016526B1 (en) 2023-11-14
KR102528323B1 (en) 2023-05-03
JP2018508949A (en) 2018-03-29
HRP20211108T8 (en) 2022-01-07
MX2017010081A (en) 2018-03-07

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