EP2465334A1 - Capot de protection de buse et porte-capot de protection de buse ainsi que torche à plasma équipée de l'un et/ou de l'autre - Google Patents

Capot de protection de buse et porte-capot de protection de buse ainsi que torche à plasma équipée de l'un et/ou de l'autre

Info

Publication number
EP2465334A1
EP2465334A1 EP10754676A EP10754676A EP2465334A1 EP 2465334 A1 EP2465334 A1 EP 2465334A1 EP 10754676 A EP10754676 A EP 10754676A EP 10754676 A EP10754676 A EP 10754676A EP 2465334 A1 EP2465334 A1 EP 2465334A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
arc plasma
protection cap
nozzle cap
plasma torch
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
EP10754676A
Other languages
German (de)
English (en)
Other versions
EP2465334B1 (fr
Inventor
Volker Krink
Frank Laurisch
Timo Grundke
Martin Kroschwald
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 Finsterwalde Plasma und Maschinen GmbH
Original Assignee
Kjellberg Finsterwalde Plasma und Maschinen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kjellberg Finsterwalde Plasma und Maschinen GmbH filed Critical Kjellberg Finsterwalde Plasma und Maschinen GmbH
Priority to SI201031273A priority Critical patent/SI2465334T1/sl
Publication of EP2465334A1 publication Critical patent/EP2465334A1/fr
Application granted granted Critical
Publication of EP2465334B1 publication Critical patent/EP2465334B1/fr
Priority to HRP20161097TT priority patent/HRP20161097T1/hr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/28—Cooling arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3457—Nozzle protection devices

Definitions

  • the present invention relates to a nozzle cap for an arc plasma torch.
  • the arc plasma torch can serve both for dry cutting and underwater cutting of various metal workpieces.
  • an arc In plasma cutting, an arc (pilot arc) is first ignited between a cathode (electrode) and anode (nozzle) and then transferred directly to a workpiece to make a cut.
  • Said arc generates a plasma, which is a thermally highly heated, electrically conductive gas (plasma gas), which consists of positive and negative ions, electrons and excited and neutral atoms and molecules.
  • plasma gas gases such as argon, hydrogen, nitrogen, oxygen or air are used. These gases are ionized and dissociated by the energy of the arc.
  • the resulting plasma jet is used to cut the workpiece.
  • a modern arc plasma burner roughly consists of basic components, such as torch body, electrode (cathode), nozzle, one or more caps, such as nozzle cap and Nozzle protection cap surrounding the nozzle and connections used to supply the arc plasma torch with power, gases and / or liquids.
  • Nozzle covers are used to protect a nozzle from the heat and spewing molten metal of the workpiece during the cutting process.
  • the nozzle may consist of one or more components.
  • the nozzle In direct water-cooled arc plasma torches, the nozzle is held by a nozzle cap. Cooling water flows between the nozzle and the nozzle cap. A secondary gas then flows between the nozzle cap and nozzle protection cap. This serves to create a defined atmosphere, to constrict the plasma jet and to protect against splashing during piercing.
  • the nozzle cap can be omitted. Then the secondary gas flows between the nozzle and nozzle protection cap.
  • the electrode and the nozzle are arranged in a certain spatial relationship to one another and delimit a space, the plasma chamber, in which this plasma jet is generated.
  • the plasma jet can in its parameters, such as. As diameter, temperature, energy density and flow rate of the plasma gas, are strongly influenced by the design of the nozzle and electrode.
  • the electrodes and nozzles are made of different materials and in different shapes.
  • Nozzles are usually made of copper and water cooled directly or indirectly. Depending on the cutting task and electrical power of the arc plasma burner nozzles are used, which have different inner contours and openings with different diameters and thus provide the optimum cutting results.
  • DE 10 2004 049 445 A1 shows an arc plasma burner with a water-cooled electrode and nozzle and a gas-cooled nozzle protection cap.
  • the secondary gas is fed through a nozzle protection cup holder inside a fferfacts Society between the Düsenschutzkappenhalter and a nozzle protection cap by a secondary gas channel formed between the nozzle cap and a nozzle cap a plasma jet.
  • EP 0 573 653 B1 relates to an arc plasma torch with water-cooled electrode and nozzle and water-cooled nozzle protection cap.
  • a secondary gas within a nozzle guard holder is internally supplied to a screw joint area between the nozzle guard holder and a nozzle guard past a plasma jet.
  • the known arc plasma torch for certain applications has insufficient cooling of the nozzle cap.
  • the known arc plasma torch is configured to form an annular cooling water chamber within the base end portion of the nozzle guard.
  • the cooling water flowing here cools the nozzle protection cap.
  • This construction has the added disadvantage that upon unscrewing the nozzle cap, the cooling water exits the cooling chamber and drips or runs on the outer surface of the nozzle cap and the inner surface of the nozzle cap. As a result, coolant residues occur in the secondary gas space formed by the nozzle cap and the nozzle protection cap, which on the one hand impairs the quality of cut and reliability, on the other hand leads to loss of coolant.
  • the invention is therefore based on the object to improve the cooling of the nozzle cap of an arc plasma burner.
  • a nozzle cap for an arc plasma torch comprising a front end portion and a rear end portion with a threaded portion on its inner surface for screwing to a burner body of an arc plasma torch, characterized in that at least one groove passes through the threaded portion on the inner surface.
  • a nozzle cap holder for an arc plasma torch comprising a portion having a threaded portion on its outer surface for screwing to a nozzle cap of an arc plasma torch, characterized in that at least one groove passes through the threaded portion on its outer surface.
  • an arc plasma torch comprising: a burner body and a nozzle cap screwed thereto in a screw connection region, in particular according to one of claims 1 to 6, characterized in that the burner body and / or the nozzle protection cap is / are designed such that between these at least one channel is formed, which traverses the erharms Scheme.
  • the threaded portion is designed for screwing to the burner body via a Düsenstoffkappenhalter.
  • the at least one groove or at least one of the grooves traverses the threaded portion parallel to the longitudinal axis of the nozzle protection cap.
  • the at least one groove or at least one of the grooves traverses the threaded portion obliquely to the longitudinal axis of the nozzle protection cap.
  • the at least one groove or at least one of the grooves traverses the threaded area helically.
  • the nozzle cap is designed in two parts. For example, this allows the only worn part to be replaced.
  • the at least one groove or at least one of the grooves passes through the threaded portion parallel to the longitudinal axis of the nozzle protection cap.
  • the at least one groove or at least one of the grooves traverses the threaded portion obliquely to the longitudinal axis of the nozzle protection cap.
  • the at least one groove or at least one of the grooves traverses the threaded area helically.
  • the nozzle cap is screwed in said rovtells Scheme via a nozzle guard holder, in particular according to one of claims 6 to 9, with the burner body.
  • the at least one channel or at least one of the channels is formed from a groove in the burner body or nozzle protection cap holder and / or a groove in the nozzle protection cap.
  • the channel is a secondary medium channel.
  • the secondary medium may be a liquid such as water and oil, a gas, or, for example, water vapor.
  • the secondary medium channel is a secondary gas channel.
  • a secondary medium inlet channel may be provided in the burner body, in particular in the nozzle protection cup holder, which communicates with the at least one secondary medium channel or at least one of the secondary medium channels.
  • the arc plasma torch may be both an arc plasma torch water- and gas-cooled with respect to the electrode and nozzle.
  • the nozzle cap may be water or gas cooled.
  • the invention is based on the surprising finding that, when used with, for example, a secondary gas, better cooling of the nozzle protection cap is achieved by guiding the secondary gas through the screw connection region. At the same time, the symmetry and thus the homogeneity of the secondary gas in the entire area are improved, which is shown in better cutting results. Sometimes even a secondary gas guide part can be omitted. In addition, the reliability is improved.
  • a secondary gas its advantages, such as constriction of the plasma jet, protection of the nozzle against high-injection metal at Piercing, creation of a defined atmosphere around the plasma jet and active participation of the secondary gas in the plasma process, continue to be used while ensuring the stability of the plasma jet.
  • Figure 1 is a longitudinal sectional view of an arc plasma torch according to a first particular embodiment of the invention
  • Figure 2 is a sectional view taken along the line A-A of Figure 1;
  • Figure 3 is a longitudinal sectional view of the nozzle cap of the arc plasma torch shown in Figure 1;
  • Figure 4 is a longitudinal sectional view of an arc plasma torch according to a second particular embodiment of the invention.
  • Figure 5 is a longitudinal sectional view of the upper part of the nozzle cap of
  • FIG. 6 shows an embodiment of a groove
  • FIG. 7 shows a further embodiment of a groove
  • FIG. 8 shows a further embodiment of a groove
  • Figure 9 is a longitudinal sectional view and a detail view of a
  • Arc plasma torch according to a third particular embodiment of the invention.
  • FIG. 10 is a longitudinal sectional view of a nozzle protection cap of FIG. 10
  • FIG. 1 shows an arc plasma torch according to a particular embodiment of the invention.
  • the arc plasma burner 1 has a burner body 2, which comprises a nozzle guard holder 2.1, a nozzle holder 2.2, an insulating piece 2.3 and an electrode holder 2.4.
  • an electrode 3 and a nozzle 4 are arranged coaxially with the longitudinal axis L of the burner body and at a spatial distance, thereby forming a plasma chamber 6 through which a plasma gas PG flows, which is supplied via a plasma gas channel 6a.
  • a nozzle cap 5 is arranged coaxially to the longitudinal axis L of the plasma torch 1 and holds the nozzle 4. Between the nozzle 4 and a nozzle cap 5 is a space 11, flows through the cooling water.
  • a nozzle cap 7 which is integrally formed here and consists of a rear portion 7a and a front portion 7b with an outlet opening 7c, is arranged coaxially to the longitudinal axis L of the plasma torch 1 and encloses the nozzle cap 5 and the nozzle 4. It is over a threaded portion with an internal thread 7.2 with an external thread 2.1.2 of the cap holder 2.1 connected to selbigem.
  • the nozzle cap 7 is preferably made of a good heat conducting material, such as copper, brass or aluminum.
  • a secondary gas SG flows through a secondary gas inlet channel 2.1.3 and a hole 2.1.4 vertically into an annular space 9a, which passes through the outer surface 2.1.1 of Nozzle protection cap holder 2.1 and the inner surface 7.1 of the nozzle cap 7 is formed and distributed. To the rear, this space 9a is sealed with a round ring 2.5.
  • the secondary gas SG then flows through the secondary gas channels 9b (see FIG. 2) in the screw connection region formed by the internal thread 7.2 and the external thread 2.1.2 into a space 9c formed by the protective cap 7 and the nozzle cap 5.
  • the space 9c tends to taper toward the tip of the plasma burner 1.
  • the secondary gas SG passes through a secondary gas guide part 8 through the openings 8a before it passes from a space 9d to the plasma jet (not shown) and exits the outlet opening 7c of the protective cap 7.
  • the secondary gas SG Since, in contrast to the prior art, the secondary gas SG is introduced into the space 9 with respect to the tip of the plasma torch 1 behind the erfacts Scheme, improves the cooling of the nozzle cap 7.
  • the secondary gas SG cools the inner surface of the nozzle cap 7 almost over the total length, on the other hand, in particular the ringtells Scheme is cooled with little effort by the secondary gas flow, which is particularly important because the nozzle guard holder 2.1 is made of plastic and is damaged in case of overheating.
  • the secondary gas SG flows faster than in the following space 9c, since the sum of the areas of the flow cross sections is smaller than the flow cross section of the space 9c. This high flow rate additionally improves the cooling effect.
  • the secondary gas can be set in rotation, thus increasing the flow velocity in the space 9c and improving the cooling.
  • Figure 2 shows the section along the line AA of the arc plasma torch 1 of Figure 1.
  • the thread 7.2 pass through three grooves, one of which is visible and denoted by reference numeral 7.3, here distributed at equal angles ⁇ 7 and thus symmetrically on the circumference are. They form with the outer surface of the external thread 2.1.2 of the Düsenschutzkappenhalters the Sekundärkaskanäle 9b, through which the secondary gas SG flows to the tip of the arc plasma burner 1 out.
  • Figure 3 shows the nozzle protection cap 7 of Figure 1. This is designed in one piece and consists essentially of the cylindrical, open at the top, rear portion 7a and the conically tapered front portion 7b and the outlet opening 7c.
  • section 7a is the thread 7.2 (internal thread), in which the grooves 7.3 are introduced, of which only one is visible and through which flows in the assembled state, the secondary gas SG.
  • the embodiment shown in Figure 4 differs from the embodiment shown in Figure 1 essentially in that the nozzle protection cap 7 consists of two components 7.10 and 7.11, which are inserted into one another. In this embodiment, these are not identical to the sections 7a and 7b of Figure 1, but they may well be.
  • the seal is made using a round ring (not marked).
  • Figure 5 shows the rear part 7.10 of Figure 4, which consists essentially of a cylindrical top open portion 7a and a part of the conically tapered portion 7b.
  • section 7a is a thread 7.2 (internal thread), are introduced in the grooves 7.3 through which flows in the assembled state, the secondary gas SG.
  • FIGS. 6 to 8 show different embodiments of the grooves 7.3 in the thread
  • FIG. 6 shows a groove lying parallel to the longitudinal axis L of the arc plasma burner 1
  • the groove 7.3 is inclined by 45 ° to the longitudinal axis L.
  • the secondary gas is set in rotation and flows at high speed through the space 9c which adjoins the tip of the arc plasma torch (see FIG. 1). This improves the cooling of the nozzle protection cap 7.
  • the grooves 7.3 are formed cross-shaped, resulting in a particularly strong turbulence of the secondary gas SG and thus to improve the cooling of the protective cap 7.
  • FIG. 9 shows a further particular embodiment.
  • the nozzle protection cap 7 here consists of two components, the rear component 7.10 and the front component 7.11.
  • the secondary gas SG flows through a channel 2.1.3 and a bore 2.1.4 of a Sekundärgaseinlasskanal perpendicular in an annular space 9a, which is formed by an outer surface 2.1.1 of Düsenschutzkappenhalters 2.1 and an inner surface 7.1 of the nozzle cap 7, and spreads.
  • This space 9a is sealed with a round ring 2.5.
  • the secondary gas SG then flows through a channel 9b in the screw connection region, which runs parallel to the threads, into the space 9c formed by the nozzle protection cap 7 and the nozzle cap 5. As a result, the rotation of the secondary gas flowing into the space 9c is increased again.
  • FIG. 10 shows a nozzle protection cap which can be used in the embodiment of FIG. 9 and which consists of a component.
  • the protective cap holder 2.1 can for the guidance of the secondary gas SG from the channel 2.1.3 instead of one also have several holes 2.1.4, which are distributed on the circumference of the cylindrical surface 2.1.1 and communicate with the channel 2.1.3. Furthermore, the bore (s) may be perpendicular or inclined to the surface of the nozzle guard holder 2.1.
  • the nozzle cap 7 may consist of one or more components (7.10, 7.11). These components do not have to be with the sections 7a and 7b can be identical, but it can be. For example, the rear component 7.10 can grout over the portion 7a and part of the portion 7b (see FIG. 4).
  • the external thread of the nozzle protection cap holder 2.1 is designed as a double-threaded thread with two parallel threaded grooves and consequently also two parallel threaded webs between the thread grooves.
  • the internal thread of the nozzle cap 7 is constructed with the same thread pitch only catchy by the normally existing in a double-threaded thread second threaded ridge is not present, but forms a wider groove. Through the wide groove in conjunction with the external thread of the nozzle protection cap holder 2.1, the medium can flow.

Landscapes

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

Abstract

L'invention concerne un capot de protection de buse pour une torche à plasma, comprenant une section terminale avant et une section terminale arrière avec une zone filetée sur sa surface intérieure pour le vissage sur un corps d'une torche à plasma, caractérisé en ce qu'au moins une rainure traverse la zone filetée sur la surface intérieure, un porte-capot de protection de buse pour une torche à plasma, comprenant une section avec une zone filetée sur sa surface extérieure pour le vissage sur un capot de protection de buse d'une torche à plasma, caractérisé en ce qu'au moins une rainure traverse la zone filetée sur sa surface extérieure, et une torche à plasma comprenant: un corps de torche et un capot de protection de buse vissé sur celui-ci dans une zone de raccordement filetée, caractérisée en ce que le corps de torche et/ou le capot de protection de buse est/sont conçu(s) de telle manière qu'au moins un canal qui traverse la zone de raccordement filetée est formé entre ceux-ci.
EP10754676.4A 2009-08-11 2010-08-04 Capot de protection de buse et porte-capot de protection de buse ainsi que torche à plasma équipée de l'un et/ou de l'autre Active EP2465334B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI201031273A SI2465334T1 (sl) 2009-08-11 2010-08-04 Zaščitni pokrov šobe in držalo zaščitnega pokrova šobe ter plazemski obločni gorilnik z le-to in/ali z le-tem
HRP20161097TT HRP20161097T1 (hr) 2009-08-11 2016-08-26 Zaštitni poklopac mlaznice, nosač zaštitnog poklopca mlaznice, te lučni plazmatski plamenik koji sadrži navedeni zaštitni poklopac mlaznice i nosač zaštitnog poklopca mlaznice

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009037376 2009-08-11
PCT/DE2010/000921 WO2011018070A1 (fr) 2009-08-11 2010-08-04 Capot de protection de buse et porte-capot de protection de buse ainsi que torche à plasma équipée de l'un et/ou de l'autre

Publications (2)

Publication Number Publication Date
EP2465334A1 true EP2465334A1 (fr) 2012-06-20
EP2465334B1 EP2465334B1 (fr) 2016-06-29

Family

ID=43223019

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10754676.4A Active EP2465334B1 (fr) 2009-08-11 2010-08-04 Capot de protection de buse et porte-capot de protection de buse ainsi que torche à plasma équipée de l'un et/ou de l'autre

Country Status (13)

Country Link
US (1) US8921731B2 (fr)
EP (1) EP2465334B1 (fr)
KR (1) KR200478396Y1 (fr)
CN (1) CN102474970B (fr)
BR (1) BR112012003073A2 (fr)
DE (1) DE202009018173U1 (fr)
ES (1) ES2593847T3 (fr)
HR (1) HRP20161097T1 (fr)
HU (1) HUE030967T2 (fr)
PL (1) PL2465334T3 (fr)
RU (1) RU118821U1 (fr)
SI (1) SI2465334T1 (fr)
WO (1) WO2011018070A1 (fr)

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US11178746B2 (en) 2016-10-06 2021-11-16 Kjellberg-Stiftung Protective nozzle cap, plasma arc torch comprising said protective nozzle cap, and use of the plasma arc torch

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US10456855B2 (en) 2013-11-13 2019-10-29 Hypertherm, Inc. Consumable cartridge for a plasma arc cutting system
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US11278983B2 (en) 2013-11-13 2022-03-22 Hypertherm, Inc. Consumable cartridge for a plasma arc cutting system
US11432393B2 (en) 2013-11-13 2022-08-30 Hypertherm, Inc. Cost effective cartridge for a plasma arc torch
EP2942144B1 (fr) * 2014-05-07 2024-07-03 Kjellberg-Stiftung Système de brûleur pour découpage au jet plasma et utilisation de pièces d'usure pour un système de brûleur pour découpage au jet de plasma
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US11178746B2 (en) 2016-10-06 2021-11-16 Kjellberg-Stiftung Protective nozzle cap, plasma arc torch comprising said protective nozzle cap, and use of the plasma arc torch

Also Published As

Publication number Publication date
EP2465334B1 (fr) 2016-06-29
ES2593847T3 (es) 2016-12-13
PL2465334T3 (pl) 2016-12-30
KR200478396Y1 (ko) 2015-10-01
RU118821U1 (ru) 2012-07-27
DE202009018173U1 (de) 2011-03-17
HRP20161097T1 (hr) 2016-10-21
KR20120004653U (ko) 2012-06-27
HUE030967T2 (en) 2017-06-28
SI2465334T1 (sl) 2016-10-28
US20120138580A1 (en) 2012-06-07
CN102474970A (zh) 2012-05-23
WO2011018070A1 (fr) 2011-02-17
BR112012003073A2 (pt) 2019-09-24
CN102474970B (zh) 2015-05-27
US8921731B2 (en) 2014-12-30

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