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EP0933981A1 - Nozzle/nozzle holder arrangement for a plasma torch - Google Patents

Nozzle/nozzle holder arrangement for a plasma torch Download PDF

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Publication number
EP0933981A1
EP0933981A1 EP99400198A EP99400198A EP0933981A1 EP 0933981 A1 EP0933981 A1 EP 0933981A1 EP 99400198 A EP99400198 A EP 99400198A EP 99400198 A EP99400198 A EP 99400198A EP 0933981 A1 EP0933981 A1 EP 0933981A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
male
female
nozzle holder
holder
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
EP99400198A
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German (de)
French (fr)
Other versions
EP0933981B1 (en
Inventor
Gérard Marhic
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.)
Lincoln Electric Company France SA
Original Assignee
La Soudure Autogene Francaise
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.)
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Publication date
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Publication of EP0933981A1 publication Critical patent/EP0933981A1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • 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

Definitions

  • the present invention relates to a set nozzle / nozzle holder for plasma torch, single torch plasma provided with such an assembly and a method of plasma arc welding, cutting or marking likely to use such a torch or together according to the invention.
  • plasma torches consist of a torch body with, in its rear part, connections to supply pipes in fluid, especially in plasma gas, and in current electric and, in its front part, means of mounting / fixing of the electrode body and the the torch.
  • the torch can be provided with means assembly / disassembly, as described in EP-A-599709, which is incorporated here by reference.
  • the nozzle is fixed to a support element called nozzle holder.
  • the aim of the present invention is therefore to alleviate the aforementioned problems by proposing a set nozzle / nozzle holder for plasma torch whose structure allows in particular to solve this problem of seizure, while improving the centering of the nozzle on the nozzle holder, and which is quick to assemble / disassemble.
  • the invention also relates to a nozzle likely to constitute the male part of a set male / female according to the invention and a nozzle holder likely to constitute the female part of such together.
  • the invention relates also a plasma torch, an automatic machine or any similar mechanized device comprising a nozzle and / or a nozzle holder capable of constituting at least one of the parts of a male / female assembly according to the invention.
  • the invention relates to a cutting, welding or arc marking process plasma capable of using a torch plasma according to the invention.
  • Figure 1 shows a sectional diagram longitudinal of part of a nozzle holder 2 according to the prior art, which comprises at its downstream end 22c, a thread 4.
  • Figure 2 shows, for its part, a nozzle 1 according to the prior art, which comprises an upstream part comprising on its external periphery a thread 3, intended to be screwed into the internal thread 4 of the nozzle holder 2 of Figure 1.
  • nozzle 1 and nozzle holder 2 structures are conventionally found in plasma torches of prior art.
  • Figures 3 to 11 show nozzles and nozzle holders in accordance with this invention.
  • Figure 3 shows the diagram a nozzle holder 2, in longitudinal section, capable of to constitute the female part of a set male / female for plasma torch according to the invention, which nozzle holder 2 comprises, on its periphery internal, near its downstream end 22c, one or several bosses 21, here three in number. These bosses 21 appear more clearly in FIG. 5, which represents a view from below, i.e. side downstream end 22c, of the nozzle holder 2 of FIG. 3.
  • FIG. 4 represents a side view of a nozzle 1 capable of constituting the male part of a male / female assembly for a plasma torch according to the invention. More precisely, it can be seen in this FIG. 4 that the nozzle 1 comprises an upstream part 11a having a diameter D1, an intermediate part 11b having a diameter D2 and a part 11c having, in the immediate vicinity of the intermediate part 11b, a diameter D3, said diameters D1, D2 and D3 being such that: D3>D1> D2.
  • the terminal end 11d of the nozzle 1 is substantially conical; however, such a form is not limiting of the invention.
  • the nozzle 1 comprises on the outer periphery of the upstream part 11a, one or more several helical ramps 14, here three in number.
  • a axial recess 15 has been made over the entire length axial L of the upstream part 11a and was, in this case, extended over the entire length of the intermediate part 11b.
  • the number of recesses 15 is also three, as well as the confirms Figure 8 which is a top view of the nozzle 1 of figure 4.
  • FIG. 6 represents a diagram in longitudinal section of the nozzle 1 according to the invention, on which we see appear the structure of the nozzle 1 and, in particular, the outlet pipe or orifice 16 through which releases the plasma flow during operation of a plasma torch in a cutting operation plasma for example.
  • the profile of the upstream part 11a of the nozzle 1, comprising the recesses 15, corresponds substantially to the internal profile of the downstream end 22c of the nozzle holder 2, which downstream end 22c carries the bosses 21, as shown in FIG. 5.
  • Figure 7 shows schematically a nozzle 1 identical to that of FIG. 4, but angularly offset by one angle of about 60 °.
  • Figures 9 to 11 show a second mode of embodiment of the invention, in which the ramps helical 14 of the nozzle 1 carry a thread 18; the other parts of the nozzle 1 remain unchanged.
  • Figure 9 shows a view of side of a nozzle 1 with helical ramps 14 threaded 18
  • FIG. 10 represents the nozzle 1 of FIG. 9 according to an angularly offset view of approximately 60 °
  • the figure 11 shows a top view, that is to say on the part side upstream 11a, of the nozzle 1 of FIGS. 9 and 10.
  • the establishment, i.e. the mounting and fixing operation, of the nozzle 1 on the nozzle holder 2 is carried out by successively carrying out an insertion in translation of the nozzle 1 into the nozzle holder 2 by passing the bosses 21 of the nozzle holder 2 in the recesses 15 of the nozzle 1, then a fixing by rotation of the nozzle 1 in the nozzle holder 2, so that the bosses 21 come to cooperate with the helical ramps 14 for maintain said nozzle 1 in position in said nozzle holder 2.
  • the fixing by rotation is continued until the wall circular 11c 'of the downstream part 11c of the nozzle 1 come into support, that is to say in abutment, against the circular end 22c 'of the end 22c of the nozzle holder 2.
  • the nozzle / nozzle holder assembly for plasma torch according to the invention can be used in any operation welding, cutting or plasma marking requiring the use of a manual plasma torch or automatic capable of being fitted with such an assembly nozzle / nozzle holder or one of these elements taken isolation.

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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)
  • Brushes (AREA)
  • Catching Or Destruction (AREA)

Abstract

Ensemble mâle/femelle pour torche à plasma comprenant : une tuyère (1) formant la partie mâle, un porte-tuyère (2) formant la partie femelle pour recevoir ladite tuyère (1), caractérisé en ce que la tuyère (1) comprend, sur sa périphérie externe, au moins une rampe hélicoïdale (14) et au moins un évidement (15) se poursuivant sur toute la longueur axiale (L) de la rampe, et en ce que le porte-tuyère (2) comprend, sur sa surface périphérique interne, au moins un bossage (21) susceptible de coopérer avec au moins une rampe hélicoïdale (14) de la tuyère (1), de manière à pouvoir assurer un maintien en position de la tuyère (1) dans le porte-tuyère (2). <IMAGE>Male / female assembly for a plasma torch comprising: a nozzle (1) forming the male part, a nozzle holder (2) forming the female part for receiving said nozzle (1), characterized in that the nozzle (1) comprises, on its outer periphery, at least one helical ramp (14) and at least one recess (15) continuing over the entire axial length (L) of the ramp, and in that the nozzle holder (2) comprises, on its internal peripheral surface, at least one boss (21) capable of cooperating with at least one helical ramp (14) of the nozzle (1), so as to be able to maintain the nozzle (1) in position in the nozzle holder (2). <IMAGE>

Description

La présente invention se rapporte à un ensemble tuyère/porte-tuyère pour torche à plasma, à une torche à plasma munie d'un tel ensemble et à un procédé de soudage, de coupage ou de marquage à l'arc plasma susceptible de mettre en oeuvre une telle torche ou un ensemble selon l'invention.The present invention relates to a set nozzle / nozzle holder for plasma torch, single torch plasma provided with such an assembly and a method of plasma arc welding, cutting or marking likely to use such a torch or together according to the invention.

Habituellement, les torches plasma se composent d'un corps de torche avec, dans sa partie arrière, des raccordements à des canalisations d'alimentation en fluide, notamment en gaz plasmagène, et en courant électrique et, dans sa partie avant, des moyens de montage/fixation du corps d'électrode et de la tuyère de la torche.Usually plasma torches consist of a torch body with, in its rear part, connections to supply pipes in fluid, especially in plasma gas, and in current electric and, in its front part, means of mounting / fixing of the electrode body and the the torch.

Dans certains cas, afin notamment de faciliter l'entretien et/ou le remplacement des pièces usagées ou défectueuses, la torche peut être dotée de moyens d'assemblage/désassemblage rapides, ainsi que décrit dans le document EP-A-599709, lequel est incorporé ici par référence.In some cases, in particular to facilitate maintenance and / or replacement of used parts or defective, the torch can be provided with means assembly / disassembly, as described in EP-A-599709, which is incorporated here by reference.

Ainsi que détaillé ci-après, dans les torches à plasma classiques, la tuyère est fixée à un élément-support appelé porte-tuyère.As detailed below, in the torches at conventional plasma, the nozzle is fixed to a support element called nozzle holder.

Dans ce type de montage, la fixation et le centrage de la tuyère sur le porte-tuyère sont, en général, principalement assurés par un filetage porté par une partie de la paroi périphérique externe de la tuyère. In this type of mounting, fixing and centering of the nozzle on the nozzle holder are, in general, mainly provided by a thread carried by a part of the outer peripheral wall of the nozzle.

Or, il a été constaté qu'en cas de surchauffe accidentelle, d'usage intensif de la torche et/ou d'encrassage de ces éléments, il apparaít des problèmes de grippage conduisant à une détérioration accélérée du porte-tuyère, et donc à un remplacement plus fréquent dudit porte-tuyère et/ou de ladite tuyère et, par là-même, à une augmentation des coûts.However, it has been found that in the event of overheating accidental, heavy use of the torch and / or fouling of these elements, problems appear seizure leading to accelerated deterioration of the nozzle holder, and therefore more frequent replacement of said nozzle holder and / or of said nozzle and, thereby, increased costs.

Le but de la présente invention est donc de pallier les problèmes précités en proposant un ensemble tuyère/porte-tuyère pour torche à plasma dont la structure permette notamment de résoudre ce problème de grippage, tout en améliorant le centrage de la tuyère sur le porte-tuyère, et qui soit de montage/démontage rapide.The aim of the present invention is therefore to alleviate the aforementioned problems by proposing a set nozzle / nozzle holder for plasma torch whose structure allows in particular to solve this problem of seizure, while improving the centering of the nozzle on the nozzle holder, and which is quick to assemble / disassemble.

La présente invention concerne alors un ensemble mâle/femelle pour torche à plasma comprenant:

  • une tuyère formant la partie mâle et comportant au moins une partie amont présentant un diamètre D1, au moins une partie intermédiaire présentant un diamètre D2 et au moins une partie aval présentant, à proximité immédiate de la partie intermédiaire, un diamètre D3, ladite partie intermédiaire étant située entre lesdites partie amont et partie aval, lesdits diamètres D1, D2 et D3 étant tels que D3>D1>D2, et
  • un porte-tuyère formant la partie femelle, lequel est susceptible de recevoir ladite tuyère, ledit ensemble mâle/femelle étant caractérisé:
  • en ce que la tuyère comprend, sur la périphérie externe de ladite partie amont, au moins une rampe hélicoïdale et au moins un évidement se poursuivant sur au moins toute la longueur axiale (L) de ladite rampe hélicoïdale, et
  • en ce que le porte-tuyère comprend, sur sa surface périphérique interne et à proximité de son extrémité aval, au moins un bossage susceptible de coopérer avec au moins une rampe hélicoïdale de la tuyère, de manière à pouvoir assurer un maintien en position de la tuyère dans le porte-tuyère par l'intermédiaire d'au moins ledit bossage et d'au moins ladite rampe, après fixation au moins par rotation de ladite tuyère dans ledit porte-tuyère.
The present invention therefore relates to a male / female assembly for a plasma torch comprising:
  • a nozzle forming the male part and comprising at least one upstream part having a diameter D1, at least one intermediate part having a diameter D2 and at least one downstream part having, in the immediate vicinity of the intermediate part, a diameter D3, said intermediate part being located between said upstream part and downstream part, said diameters D1, D2 and D3 being such that D3>D1> D2, and
  • a nozzle holder forming the female part, which is capable of receiving said nozzle, said male / female assembly being characterized:
  • in that the nozzle comprises, on the external periphery of said upstream part, at least one helical ramp and at least one recess continuing over at least the entire axial length (L) of said helical ramp, and
  • in that the nozzle holder comprises, on its internal peripheral surface and close to its downstream end, at least one boss capable of cooperating with at least one helical ramp of the nozzle, so as to be able to maintain the position in position nozzle in the nozzle holder by means of at least said boss and at least said ramp, after fixing at least by rotation of said nozzle in said nozzle holder.

Selon le cas, l'ensemble mâle/femelle selon l'invention peut comprendre l'une ou plusieurs des caractéristiques suivantes:

  • la tuyère porte plusieurs rampes hélicoïdales, de préférence au moins trois rampes hélicoïdales;
  • le porte-tuyère comprend plusieurs bossages, de préférence au moins trois bossages;
  • un évidement est pratiqué entre chaque rampe hélicoïdale et/ou poursuivi sur au moins une partie de la partie intermédiaire de la tuyère;
  • le profil interne du porte-tuyère, au niveau de son extrémité aval, correspond sensiblement au profil externe de la tuyère, au niveau de sa partie amont.
Depending on the case, the male / female assembly according to the invention may include one or more of the following characteristics:
  • the nozzle carries several helical ramps, preferably at least three helical ramps;
  • the nozzle holder comprises several bosses, preferably at least three bosses;
  • a recess is made between each helical ramp and / or continued on at least part of the intermediate part of the nozzle;
  • the internal profile of the nozzle holder, at its downstream end, corresponds substantially to the external profile of the nozzle, at its upstream part.

L'invention concerne également une tuyère susceptible de constituer la partie mâle d'un ensemble mâle/femelle selon l'invention et un porte-tuyère susceptible de constituer la partie femelle d'un tel ensemble.The invention also relates to a nozzle likely to constitute the male part of a set male / female according to the invention and a nozzle holder likely to constitute the female part of such together.

Selon un autre aspect, l'invention concerne également une torche à plasma, une machine automatique ou tout dispositif mécanisé analogue comportant une tuyère et/ou un porte-tuyère susceptible de constituer au moins l'une des parties d'un ensemble mâle/femelle selon l'invention.According to another aspect, the invention relates also a plasma torch, an automatic machine or any similar mechanized device comprising a nozzle and / or a nozzle holder capable of constituting at least one of the parts of a male / female assembly according to the invention.

Selon encore un autre aspect, l'invention a trait à un procédé de coupage, de soudage ou de marquage à l'arc plasma susceptible de mettre en oeuvre une torche à plasma selon l'invention.According to yet another aspect, the invention relates to a cutting, welding or arc marking process plasma capable of using a torch plasma according to the invention.

La présente invention va maintenant être décrite plus en détail et en référence aux figures annexées, lesquelles sont données à titre illustratif, mais non limitatif. The present invention will now be described. in more detail and with reference to the appended figures, which are given by way of illustration, but not limiting.

La figure 1 représente un schéma en coupe longitudinale d'une partie d'un porte-tuyère 2 selon l'art antérieur, lequel comprend à son extrémité aval 22c, un taraudage 4.Figure 1 shows a sectional diagram longitudinal of part of a nozzle holder 2 according to the prior art, which comprises at its downstream end 22c, a thread 4.

La figure 2 représente, quant à elle, une tuyère 1 selon l'art antérieur, laquelle comporte une partie amont comportant sur sa périphérie externe un filetage 3, destiné à venir se visser dans le taraudage 4 du porte-tuyère 2 de la figure 1.Figure 2 shows, for its part, a nozzle 1 according to the prior art, which comprises an upstream part comprising on its external periphery a thread 3, intended to be screwed into the internal thread 4 of the nozzle holder 2 of Figure 1.

Ces structures de tuyère 1 et de porte-tuyère 2 se retrouvent classiquement dans les torches à plasma de l'art antérieur.These nozzle 1 and nozzle holder 2 structures are conventionally found in plasma torches of prior art.

A l'inverse, les figures 3 à 11 représentent des tuyères et porte-tuyères conformes à la présente invention.Conversely, Figures 3 to 11 show nozzles and nozzle holders in accordance with this invention.

Plus précisément, la figure 3 représente le schéma d'un porte-tuyère 2, en coupe longitudinale, susceptible de constituer la partie femelle d'un ensemble mâle/femelle pour torche à plasma selon l'invention, lequel porte-tuyère 2 comprend, sur sa périphérie interne, à proximité de son extrémité avale 22c, un ou plusieurs bossages 21, ici au nombre de trois. Ces bossages 21 apparaissent plus nettement sur la figure 5, qui représente une vue par dessous, c'est-à-dire côté extrémité aval 22c, du porte-tuyère 2 de la figure 3.More specifically, Figure 3 shows the diagram a nozzle holder 2, in longitudinal section, capable of to constitute the female part of a set male / female for plasma torch according to the invention, which nozzle holder 2 comprises, on its periphery internal, near its downstream end 22c, one or several bosses 21, here three in number. These bosses 21 appear more clearly in FIG. 5, which represents a view from below, i.e. side downstream end 22c, of the nozzle holder 2 of FIG. 3.

Par ailleurs, la figure 4 représente une vue de côté d'une tuyère 1 susceptible de constituer la partie mâle d'un ensemble mâle/femelle pour torche à plasma selon l'invention. Plus précisément, on voit sur cette figure 4 que la tuyère 1 comprend une partie amont 11a présentant un diamètre D1, une partie intermédiaire 11b présentant un diamètre D2 et une partie 11c présentant, à proximité immédiate de la partie intermédiaire 11b, un diamètre D3, lesdits diamètres D1, D2 et D3 étant tels que: D3 > D1 > D2. Furthermore, FIG. 4 represents a side view of a nozzle 1 capable of constituting the male part of a male / female assembly for a plasma torch according to the invention. More precisely, it can be seen in this FIG. 4 that the nozzle 1 comprises an upstream part 11a having a diameter D1, an intermediate part 11b having a diameter D2 and a part 11c having, in the immediate vicinity of the intermediate part 11b, a diameter D3, said diameters D1, D2 and D3 being such that: D3>D1> D2.

Dans le mode de réalisation représenté ici, l'extrémité terminale 11d de la tuyère 1 est sensiblement conique; toutefois, une telle forme n'est pas limitative de l'invention.In the embodiment shown here, the terminal end 11d of the nozzle 1 is substantially conical; however, such a form is not limiting of the invention.

On voit, en outre, que la tuyère 1 comprend sur la périphérie externe de la partie amont 11a, une ou plusieurs rampes hélicoïdales 14, ici au nombre de trois.We see, moreover, that the nozzle 1 comprises on the outer periphery of the upstream part 11a, one or more several helical ramps 14, here three in number.

Par ailleurs, entre chacune de ces rampes 14, un évidement axial 15 a été pratiqué sur toute la longueur axiale L de la partie amont 11a et a été, dans ce cas, prolongé sur toute la longueur de la partie intermédiaire 11b. Dans le mode de la réalisation de la figure 4, le nombre des évidements 15 est aussi de trois, ainsi que le confirme la figure 8 qui est une vue du dessus de la tuyère 1 de la figure 4.Furthermore, between each of these ramps 14, a axial recess 15 has been made over the entire length axial L of the upstream part 11a and was, in this case, extended over the entire length of the intermediate part 11b. In the embodiment of Figure 4, the number of recesses 15 is also three, as well as the confirms Figure 8 which is a top view of the nozzle 1 of figure 4.

La figure 6 représente, quant à elle, un schéma en coupe longitudinale de la tuyère 1 selon l'invention, sur lequel on voit apparaítre la structure de la tuyère 1 et, en particulier, le conduit ou orifice de sortie 16 par lequel sort le flux plasmagène, lors du fonctionnement d'une torche à plasma dans une opération de coupage plasma par exemple.FIG. 6 represents a diagram in longitudinal section of the nozzle 1 according to the invention, on which we see appear the structure of the nozzle 1 and, in particular, the outlet pipe or orifice 16 through which releases the plasma flow during operation of a plasma torch in a cutting operation plasma for example.

De préférence, le profil de la partie amont 11a de la tuyère 1, comprenant les évidements 15, correspond sensiblement au profil interne de l'extrémité aval 22c du porte-tuyère 2, laquelle extrémité aval 22c porte les bossages 21, ainsi que représenté sur la figure 5.Preferably, the profile of the upstream part 11a of the nozzle 1, comprising the recesses 15, corresponds substantially to the internal profile of the downstream end 22c of the nozzle holder 2, which downstream end 22c carries the bosses 21, as shown in FIG. 5.

La figure 7 schématise une tuyère 1 identique à celle de la figure 4, mais angulairement décalée d'un angle d'environ 60°.Figure 7 shows schematically a nozzle 1 identical to that of FIG. 4, but angularly offset by one angle of about 60 °.

Les figures 9 à 11 représentent un second mode de réalisation de l'invention, dans lequel les rampes hélicoïdales 14 de la tuyère 1 portent un filetage 18; les autres parties de la tuyère 1 restent inchangées.Figures 9 to 11 show a second mode of embodiment of the invention, in which the ramps helical 14 of the nozzle 1 carry a thread 18; the other parts of the nozzle 1 remain unchanged.

Plus précisément, la figure 9 représente une vue de côté d'une tuyère 1 à rampes hélicoïdales 14 filetées 18, la figure 10 représente la tuyère 1 de la figure 9 selon une vue angulairement décalée d'environ 60°, et la figure 11 représente une vue du dessus, c'est-à-dire côté partie amont 11a, de la tuyère 1 des figures 9 et 10.More specifically, Figure 9 shows a view of side of a nozzle 1 with helical ramps 14 threaded 18, FIG. 10 represents the nozzle 1 of FIG. 9 according to an angularly offset view of approximately 60 °, and the figure 11 shows a top view, that is to say on the part side upstream 11a, of the nozzle 1 of FIGS. 9 and 10.

De manière générale, la mise en place, c'est-à-dire l'opération de montage et fixation, de la tuyère 1 sur le porte-tuyère 2 est effectuée en réalisant successivement une insertion en translation de la tuyère 1 dans le porte-tuyère 2 en faisant passer les bossages 21 du porte-tuyère 2 dans les évidements 15 de la tuyère 1, puis une fixation par rotation de la tuyère 1 dans le porte-tuyère 2, de manière à ce que les bossages 21 viennent coopérer avec les rampes hélicoïdales 14 pour assurer un maintien en position de ladite tuyère 1 dans ledit porte-tuyère 2.Generally speaking, the establishment, i.e. the mounting and fixing operation, of the nozzle 1 on the nozzle holder 2 is carried out by successively carrying out an insertion in translation of the nozzle 1 into the nozzle holder 2 by passing the bosses 21 of the nozzle holder 2 in the recesses 15 of the nozzle 1, then a fixing by rotation of the nozzle 1 in the nozzle holder 2, so that the bosses 21 come to cooperate with the helical ramps 14 for maintain said nozzle 1 in position in said nozzle holder 2.

Avantageusement, la fixation par rotation, c'est-à-dire par vissage, est poursuivie jusqu'à ce que la paroi circulaire 11c' de la partie aval 11c de la tuyère 1 vienne en appui, c'est-à-dire en butée, contre l'extrémité circulaire 22c' de l'extrémité 22c du porte-tuyère 2.Advantageously, the fixing by rotation, that is to say by screwing, is continued until the wall circular 11c 'of the downstream part 11c of the nozzle 1 come into support, that is to say in abutment, against the circular end 22c 'of the end 22c of the nozzle holder 2.

L'ensemble tuyère/porte-tuyère pour torche à plasma selon l'invention peut être utilisé dans toute opération de soudage, de coupage ou de marquage plasma nécessitant l'utilisation d'une torche à plasma manuelle ou automatique susceptible d'être équipée d'un tel ensemble tuyère/porte-tuyère ou d'un de ces éléments pris isolément.The nozzle / nozzle holder assembly for plasma torch according to the invention can be used in any operation welding, cutting or plasma marking requiring the use of a manual plasma torch or automatic capable of being fitted with such an assembly nozzle / nozzle holder or one of these elements taken isolation.

Claims (10)

Ensemble mâle/femelle pour torche à plasma comprenant : une tuyère (1) formant la partie mâle et comportant au moins une partie amont (11a) présentant un diamètre D1, au moins une partie intermédiaire (11b) présentant un diamètre D2 et au moins une partie aval (11c) présentant, à proximité immédiate de la partie intermédiaire (11b), un diamètre D3, ladite partie intermédiaire (11b) étant située entre lesdites partie amont (11a) et partie aval (11c), lesdits diamètres D1, D2 et D3 étant tels que D3>D1>D2, et un porte-tuyère (2) formant la partie femelle, lequel est susceptible de recevoir ladite tuyère (1), ledit ensemble mâle/femelle étant caractérisé: en ce que la tuyère (1) comprend, sur la périphérie externe de ladite partie amont (11a), au moins une rampe hélicoïdale (14) et au moins un évidement (15) se poursuivant sur au moins toute la longueur axiale (L) de ladite rampe hélicoïdale (14), et en ce que le porte-tuyère (2) comprend, sur sa surface périphérique interne et à proximité de son extrémité aval (22c) , au moins un bossage (21) susceptible de coopérer avec au moins une rampe hélicoïdale (14) de la tuyère (1), de manière à pouvoir assurer un maintien en position de la tuyère (1) dans le porte-tuyère (2) par l'intermédiaire d'au moins ledit bossage (21) et d'au moins ladite rampe (14), après fixation au moins par rotation de ladite tuyère (1) dans ledit porte-tuyère (2). Male / female set for plasma torch comprising: a nozzle (1) forming the male part and comprising at least one upstream part (11a) having a diameter D1, at least one intermediate part (11b) having a diameter D2 and at least one downstream part (11c) having, in the immediate vicinity of the intermediate part (11b), a diameter D3, said intermediate part (11b) being located between said upstream part (11a) and downstream part (11c), said diameters D1, D2 and D3 being such that D3>D1> D2, and a nozzle holder (2) forming the female part, which is capable of receiving said nozzle (1), said male / female assembly being characterized: in that the nozzle (1) comprises, on the external periphery of said upstream part (11a), at least one helical ramp (14) and at least one recess (15) continuing over at least the entire axial length (L) of said helical ramp (14), and in that the nozzle holder (2) comprises, on its internal peripheral surface and close to its downstream end (22c), at least one boss (21) capable of cooperating with at least one helical ramp (14) of the nozzle (1), so as to be able to maintain the nozzle (1) in position in the nozzle holder (2) by means of at least said boss (21) and at least said ramp (14) , after fixing at least by rotation of said nozzle (1) in said nozzle holder (2). Ensemble mâle/femelle selon la revendication 1, caractérisé en ce que la tuyère (1) porte plusieurs rampes hélicoïdales (14), de préférence au moins 3 rampes hélicoïdales (14). Male / female assembly according to claim 1, characterized in that the nozzle (1) carries several helical ramps (14), preferably at least 3 ramps helical (14). Ensemble mâle/femelle selon l'une des revendications 1 ou 2, caractérisé en ce que le porte-tuyère (2) comprend plusieurs bossages (21), de préférence au moins 3 bossages (21).Male / female set according to one of claims 1 or 2, characterized in that the nozzle holder (2) comprises several bosses (21), of preferably at least 3 bosses (21). Ensemble mâle/femelle selon l'une des revendications 1 ou 2, caractérisé en ce qu'un évidement (15) est pratiqué entre chaque rampe hélicoïdale (14) et/ou poursuivi sur au moins une partie de la partie intermédiaire (11b) de la tuyère (1).Male / female set according to one of claims 1 or 2, characterized in that a recess (15) is made between each helical ramp (14) and / or continued on at least part of the game intermediate (11b) of the nozzle (1). Ensemble mâle/femelle selon l'une des revendications 1 à 4, caractérisé en ce que le profil interne du porte-tuyère (2), au niveau de son extrémité aval (22c), correspond sensiblement au profil externe de la tuyère (1), au niveau de sa partie amont (11a).Male / female set according to one of Claims 1 to 4, characterized in that the profile internal of the nozzle holder (2), at its end downstream (22c), corresponds substantially to the external profile of the nozzle (1), at its upstream part (11a). Tuyère (1) susceptible de constituer la partie mâle d'un ensemble mâle/femelle selon l'une des revendications 1 à 5, caractérisée en ce qu'elle comporte, sur la périphérie externe de sa partie amont (11a), au moins une rampe hélicoïdale (14) et au moins un évidement (15) se poursuivant sur au moins toute la longueur axiale (L) de ladite rampe hélicoïdale (14).Nozzle (1) likely to constitute the part male of a male / female set according to one of claims 1 to 5, characterized in that it has, on the outer periphery of its upstream part (11a), at least one helical ramp (14) and at least one recess (15) continuing over at least the entire axial length (L) of said helical ramp (14). Porte-tuyère (2) susceptible de constituer la partie femelle d'un ensemble mâle/femelle selon l'une des revendications 1 à 5, caractérisée en ce qu'elle comporte, sur sa surface périphérique interne et à proximité de son extrémité aval (22c), au moins un bossage (21) susceptible de coopérer avec au moins une rampe hélicoïdale (14) d'une tuyère (1) selon la revendication 6.Nozzle holder (2) capable of constituting the female part of a male / female assembly according to one of claims 1 to 5, characterized in that it has, on its internal peripheral surface and near its downstream end (22c), at least one boss (21) capable of cooperating with at least one helical ramp (14) of a nozzle (1) according to the claim 6. Torche à plasma, caractérisée en ce qu'elle est équipée d'un ensemble mâle/femelle selon l'une des revendications 1 à 5, d'une tuyère selon la revendication 6 et/ou d'un porte-tuyère selon la revendication 7.Plasma torch, characterized in that it is equipped with a male / female assembly according to one of claims 1 to 5 of a nozzle according to claim 6 and / or a nozzle holder according to claim 7. Machine automatique de soudage, de coupage ou de marquage à l'arc plasma, caractérisée en ce qu'elle est équipée d'un ensemble mâle/femelle selon l'une des revendications 1 à 5, d'une tuyère (1) selon la revendication 6, d'un porte-tuyère selon la revendication 7 et/ou d'une torche à plasma selon la revendication 8.Automatic welding, cutting or plasma arc marking, characterized in that it is equipped with a male / female assembly according to one of claims 1 to 5, of a nozzle (1) according to the claim 6, of a nozzle holder according to claim 7 and / or a plasma torch according to claim 8. Procédé de soudage, de coupage ou de marquage à l'arc plasma, caractérisé en ce qu'on utilise une torche à plasma selon la revendication 8 ou une machine automatique selon la revendication 9.Welding, cutting or marking process plasma arc, characterized in that a torch is used plasma according to claim 8 or a machine automatic according to claim 9.
EP99400198A 1998-02-02 1999-01-28 Nozzle/nozzle holder arrangement for a plasma torch Expired - Lifetime EP0933981B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9801146 1998-02-02
FR9801146A FR2774548B1 (en) 1998-02-02 1998-02-02 NOZZLE / NOZZLE HOLDER ASSEMBLY FOR PLASMA TORCH
US09/443,048 US6169264B1 (en) 1998-02-02 1999-11-18 Nozzle/nozzle carrier assembly for a plasma torch
CA002290146A CA2290146A1 (en) 1998-02-02 1999-11-22 Nozzle/nozzle holder set for plasma torch

Publications (2)

Publication Number Publication Date
EP0933981A1 true EP0933981A1 (en) 1999-08-04
EP0933981B1 EP0933981B1 (en) 2001-10-17

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Family Applications (1)

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EP99400198A Expired - Lifetime EP0933981B1 (en) 1998-02-02 1999-01-28 Nozzle/nozzle holder arrangement for a plasma torch

Country Status (7)

Country Link
US (1) US6169264B1 (en)
EP (1) EP0933981B1 (en)
CA (1) CA2290146A1 (en)
DE (1) DE69900348T2 (en)
ES (1) ES2165224T3 (en)
FR (1) FR2774548B1 (en)
PT (1) PT933981E (en)

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Also Published As

Publication number Publication date
EP0933981B1 (en) 2001-10-17
FR2774548A1 (en) 1999-08-06
DE69900348D1 (en) 2001-11-22
FR2774548B1 (en) 2000-03-03
DE69900348T2 (en) 2002-09-05
CA2290146A1 (en) 2001-05-22
PT933981E (en) 2002-02-28
US6169264B1 (en) 2001-01-02
ES2165224T3 (en) 2002-03-01

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