EP2532214A1 - Hohltrichterförmiger plasmagenerator - Google Patents
Hohltrichterförmiger plasmageneratorInfo
- Publication number
- EP2532214A1 EP2532214A1 EP10788326A EP10788326A EP2532214A1 EP 2532214 A1 EP2532214 A1 EP 2532214A1 EP 10788326 A EP10788326 A EP 10788326A EP 10788326 A EP10788326 A EP 10788326A EP 2532214 A1 EP2532214 A1 EP 2532214A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- truncated cone
- plasma generator
- gas guide
- guide channel
- electrode
- 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
Links
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 61
- 239000013307 optical fiber Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000009832 plasma treatment Methods 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 2
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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
- H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
Definitions
- the invention relates to a plasma generator with the features of the preamble of independent claim 1.
- a plasma generator is to be understood here as a device with which a physical plasma, ie. H. an energetic excited state of a gas supplied to the plasma generator can be caused.
- a physical plasma exiting the plasma generator can be used, for example, to activate surfaces.
- Particulate or filamentary material can be treated with the plasma within the plasma generator.
- the gas supplied to the plasma generator itself may be the object of the plasma treatment.
- a plasma generator with the features of the preamble of independent claim 1 is known. It is a plasma spray gun having a tubular anode with partially truncated cone-shaped inner surfaces and a coaxially arranged in the tubular anode cathode.
- the cathode is solid and has at its free end behind a rounded tip on one of the truncated cone-shaped portions of the tubular cathode opposite truncated cone-shaped surface.
- In front of the free end of the cathode is a portion of the tubular anode of cylindrical free cross-section which is longer than any truncated cone-shaped portion of the tubular anode.
- This plasma generator is in DE 694 08 502 T2 as prior art specified.
- the portion of the tubular anode which is arranged around the truncated cone-shaped surface of the cathode, in the form of a cylinder jacket.
- a plasma generator having the features of the preamble of independent claim 1, with a solid electrode on the axis of the gas guide channel, which is here designed as an anode, and with a portion of the gas guide channel with a cylindrical free cross section, which adjoins the free end of the electrode also known from EP 0 342 388 A2.
- 6,986,471 B1 discloses a plasma spraying method in which a plasma is initially generated, which is then mixed in a nozzle arrangement with a carrier gas in which particles are dispersed.
- This nozzle arrangement has for the carrier gas to a hollow funnel, which tapers to the mouth of an expansion nozzle, from which the plasma exits.
- a plasma generator for producing a collimated plasma jet in which means for generating a turbulent flow around the axis of the gas guide channel are formed in a gas guide channel formed around a pin electrode.
- the gas guide channel Before the free end of the pin electrode, the gas guide channel has a portion with a truncated cone-shaped wall until it ends at an annular counter electrode.
- WO 2007/080102 A1 discloses a method for treating a surface, in particular in order to free it from impurities, the surface being exposed simultaneously to laser light and to a physical plasma induced by electrical high voltage.
- the laser light is directed together with a free working gas flow between two electrodes of the plasma source into the treatment area.
- the electrodes are rod-shaped and aligned parallel to each other and parallel to the surface.
- the plasma generator has an electrode plate with a central opening. This opening forms the output of the plasma generator for plasma and at the same time an exit for one high-energy beam, which is coupled upstream in the plasma generator and to shield the plasma in the radial direction.
- a plasma ejector is formed around the central opening, through which ejector gas flows.
- This plasma ejector has a gas guide channel between an outer truncated cone-shaped wall and an inner truncated cone-shaped wall, wherein both truncated cone-shaped walls are formed by the electrode plate and wherein the cone angle of the outer truncated cone-shaped wall is smaller than that of the inner truncated cone-shaped wall.
- the plasma serves to shield a high-energy beam, for example from a laser.
- the plasma itself is encased behind the plasma ejector in a vortex generator with a rotating vortex of another fluid.
- the invention has for its object to provide a plasma generator with the features of the preamble of independent claim 1, in which the area of the emerging from the mouth of the gas guide channel plasma is accessible without disturbing the plasma.
- the coaxially disposed within the truncated cone-shaped wall electrode extends annularly around the axis along which the gas guide channel extends in its end region and on which the gas guide channel ends.
- the truncated cone-shaped surface delimiting the gas guide channel within the truncated cone-shaped wall is the surface of an annular element, whereby this annular element can be the electrode.
- a working channel which is transparent at least for light of one wavelength extends on the axis through the electrode to the gas guide channel. About this working channel and the preceding section of the gas guide channel, the area in which the plasma exits the gas guide channel, accessible from behind at least for the light of this one wavelength.
- the light can be used simultaneously with the plasma to treat a surface. In the reverse direction, light of this wavelength can be registered from the plasma region to monitor the plasma or surface treatment with the plasma; or the light can give information about the material of the surface.
- the working channel is transparent not only to light of one wavelength, but to light in a wider range of wavelengths. It is even more preferable if the working channel has a free cross section up to the gas guide channel.
- gases or particles can also be injected into the gas guide channel or introduced into a plasma formed there via the working channel.
- the working channel has a free cross-section
- a cone angle of the frustoconical wall defining the gas guide channel a cone angle of the frustoconical surface disposed within the frustoconical wall, a distance of the frustoconical wall from the frustoconical surface and a free end cross section of the frustoconical wall
- Measures that contribute to avoiding or at least reducing such a stagnation point consist in a sufficiently small opening angle of the truncated cone-shaped wall and the truncated cone-shaped surface and in a sufficiently free end cross-section of the truncated cone-shaped wall.
- This free end cross section should not be smaller than the free cross section of the working channel.
- the truncated cone-shaped wall facing, in turn truncated cone-shaped surface may be at least partially formed by the annular electrode or arranged on the annular electrode dielectric.
- the electrode is provided at least at the free end of the truncated cone-shaped surface. see. However, it can also extend over the entire extent of the truncated-cone-shaped surface along the axis of the gas guide channel, possibly under a dielectric covering it.
- the truncated cone-shaped wall of the new plasma generator limiting the gas guide channel to the outside is preferably formed from a dielectric.
- a truncated cone-shaped counterelectrode can be arranged externally on at least part of the truncated-cone-shaped wall.
- the plasma in the new plasma generator may be formed between the electrode and the counter electrode and thus in the hollow funnel-shaped portion of the gas guide channel between the frustoconical surface and the truncated cone wall.
- the truncated cone-shaped wall and the truncated cone-shaped surface may have an at least approximately equal cone angle, so that the distance between the frustoconical wall and the frustoconical surface is substantially constant and correspondingly over the entire surface Form length of the gas guide channel in its hollow funnel-shaped portion about the same field strengths of the electric field between the electrodes.
- the course of the distance between the frustoconical wall and the frustoconical surface and its influence on the free cross section of the gas guide channel can be used selectively in order to specifically influence the flow through the gas guide channel.
- the cone angle of the frustoconical wall can be greater or smaller than the cone angle of the truncated cone-shaped surface, so that the distance between the wall and the surface in the direction of flow of the gas guide channel decreases or increases.
- the gas guide channel of the new plasma generator can end directly with the frustoconical wall.
- a stable free jet of the gas flowing through the gas guide channel then also sets in, in which the plasma is formed.
- the exit point of this free jet is only slightly removed from the place of generation of the plasma between the electrode and arranged in the region of the truncated cone-shaped wall counter electrode, so that many energetic received excited species of the plasma in the free jet and not previously undergo a Wiederabregung.
- At least one gas supply channel with a tangential component can lead into the gas guide channel, in order in this way to influence the flow conditions in the gas guide channel.
- the at least one gas supply channel can, for example, open directly into the end region of the gas guide channel designed according to the invention or else into an annular space arranged upstream thereof.
- gas guide elements may be provided which have a guide component in the circumferential direction about the axis of the Gas Installations- channel.
- the new plasma generator requires an AC high voltage generator to operate, which supplies the electrode with a high voltage alternating voltage.
- the alternating high voltage preferably has bipolar voltage pulses. Applying the AC high voltage generator voltage pulses for the electrode to earth, against a arranged in the region of the truncated cone-shaped wall of the gas guide channel counter electrode or against a surface to be treated with the plasma.
- Fig. 1 outlines a first embodiment of the new plasma generator in a first mode of operation.
- FIG. 2 outlines the embodiment of the plasma generator according to FIG. 1 in a second mode of operation.
- Fig. 3 outlines a second embodiment of the new plasma generator
- Fig. 4 outlines a third embodiment of the new plasma generator.
- Fig. 1 plasma generator 1 is shown without a necessary for its operation AC high voltage generator.
- This alternating high voltage generator applies a high alternating voltage between a funnel-shaped, ie more precisely truncated cone-shaped, electrode 2 and a likewise funnel-shaped, ie more precisely truncated cone-shaped, counter-electrode 3.
- a corresponding funnel-shaped dielectric 4 and a hollow funnel-shaped discharge space 5 are arranged between the electrodes 2 and 3, specifically in front of the counterelectrode 3.
- the alternating high voltage therefore causes a dielectrically impeded discharge in a gas 6 flowing through the discharge space 5.
- the discharge space 5 is at the same time a gas guide channel 7 for the gas 6, which starts here from an annular space 8, extends along an axis 9 and ends on this axis 9.
- the gas guide channel 7 is limited to the outside by the dielectric 4 as a truncated cone-shaped wall 10 and inwardly through this wall 10 opposite truncated cone-shaped surface 1 1 of the electrode 2.
- the electrode 2 is arranged annularly around the axis 9 around and leaves in the area This axis 9 a free working channel 12 which extends with free cross-section to the gas guide channel 7, specifically up to the end 13, at the free end of the truncated cone-shaped wall 10.
- a gas flow from the annular space 8 through the gas guide channel 7 forms before the end 13 of a free jet 14, which contains plasma-typical energetically excited species.
- a further gas to be treated or to be added to a plasma treatment particles and / or electromagnetic radiation can be supplied.
- electromagnetic radiation from the area of the free jet 14 can also be received and analyzed.
- a ring flow 16 of the gas 7 is formed in the annular space 8 in order to influence the flow of the gas guide channel 7 with the gas 6.
- the plasma generator 1 of FIG. 1 is used to treat a surface 17 of an object 18.
- one or more discharge filaments 19 are formed between the surface 17 and the electrode 2.
- the plasma-generating discharge can also be focused entirely on the area between the electrode 2 and the surface 17 by applying the alternating high voltage with the alternating high voltage generator in between and dispensing with connection of the counter electrode 3 to the alternating high voltage generator.
- the surface 1 7 can be treated simultaneously with the plasma with laser light, or with the optical fiber 20 light is received from the area of the treatment of the surface 17 with the plasma, for example, to monitor this treatment.
- FIG. 3 outlines a specific embodiment of the plasma generator 1.
- the frustoconical wall and the opposing frustoconical surface 1 1 of the electrode 2 each have a cone angle of 60 °.
- the free diameter of the working channel 12 at its free end is also the same size as the free inner diameter of the truncated cone-shaped wall 10 at its free end.
- the distance of the truncated cone-shaped wall 10 to the truncated cone-shaped surface 1 1 is tuned so that in the entire gas guide channel 7 to the end 13 no stagnation point is formed by the larger amounts of gas 6 would be pressed into the working channel 12.
- the embodiment of the plasma generator 1 according to FIG. 4 differs from that according to FIG. 3 in the detail that adjoins the frustoconical wall 10 is a mouth 21 of the gas guide channel 7 with a cylindrical free cross section.
- a free jet emerging from the plasma generator 1 can be further stabilized, which
- Such an orifice 21 of the gas guide channel 7 with a cylindrical free cross-section can also be useful for other reasons than beam stabilization, z. B. to provide security against contact with the internal electrode 2 or maintain a desired working distance.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Plasma Technology (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010001606A DE102010001606A1 (de) | 2010-02-04 | 2010-02-04 | Hohltrichterförmiger Plasmagenerator |
PCT/EP2010/069123 WO2011095245A1 (de) | 2010-02-04 | 2010-12-08 | Hohltrichterförmiger plasmagenerator |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2532214A1 true EP2532214A1 (de) | 2012-12-12 |
EP2532214B1 EP2532214B1 (de) | 2016-03-23 |
Family
ID=43827574
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10788326.6A Not-in-force EP2532214B1 (de) | 2010-02-04 | 2010-12-08 | Hohltrichterförmiger plasmagenerator |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2532214B1 (de) |
DE (1) | DE102010001606A1 (de) |
WO (1) | WO2011095245A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017118652A1 (de) | 2017-08-16 | 2019-02-21 | Hochschule Für Angewandte Wissenschaft Und Kunst Hildesheim/Holzminden/Göttingen | Plasmageneratormodul und dessen Verwendung |
WO2021235912A1 (ko) * | 2020-05-22 | 2021-11-25 | 이창훈 | 대기압 플라즈마 발생 장치를 이용한 원통형 및 환형 피처리물의 표면처리 시스템 및 방법 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3719829A (en) * | 1970-04-10 | 1973-03-06 | Versar Inc | Laser beam techniques |
US4841114A (en) | 1987-03-11 | 1989-06-20 | Browning James A | High-velocity controlled-temperature plasma spray method and apparatus |
US5444209A (en) | 1993-08-11 | 1995-08-22 | Miller Thermal, Inc. | Dimensionally stable subsonic plasma arc spray gun with long wearing electrodes |
US5705785A (en) * | 1994-12-30 | 1998-01-06 | Plasma-Laser Technologies Ltd | Combined laser and plasma arc welding torch |
DE10065629C1 (de) * | 2000-12-21 | 2002-08-29 | Fraunhofer Ges Forschung | Vorrichtung zur Beschichtung eines Substrates mit einem Plasmabrenner |
US7011790B2 (en) * | 2001-05-07 | 2006-03-14 | Regents Of The University Of Minnesota | Non-thermal disinfection of biological fluids using non-thermal plasma |
CA2353752A1 (en) * | 2001-07-25 | 2003-01-25 | Precisionh2 Inc. | Production of hydrogen and carbon from natural gas or methane using barrier discharge non-thermal plasma |
US6986471B1 (en) | 2002-01-08 | 2006-01-17 | Flame Spray Industries, Inc. | Rotary plasma spray method and apparatus for applying a coating utilizing particle kinetics |
KR101072792B1 (ko) * | 2003-01-31 | 2011-10-14 | 다우 코닝 아일랜드 리미티드 | 플라즈마 발생 전극 조립체 |
US7075030B2 (en) * | 2004-08-30 | 2006-07-11 | Brookhaven Science Associates, Llc | Shielded beam delivery apparatus and method |
DE102006001891B3 (de) | 2006-01-14 | 2007-12-20 | Fachhochschule Hildesheim/Holzminden/Göttingen | Verfahren und Vorrichtung zur Behandlung einer Oberfläche, insbesondere um diese von Verunreinigungen zu befreien |
DE202009000537U1 (de) | 2009-01-14 | 2009-04-02 | Reinhausen Plasma Gmbh | Strahlgenerator zur Erzeugung eines gebündelten Plasmastrahls |
-
2010
- 2010-02-04 DE DE102010001606A patent/DE102010001606A1/de not_active Withdrawn
- 2010-12-08 EP EP10788326.6A patent/EP2532214B1/de not_active Not-in-force
- 2010-12-08 WO PCT/EP2010/069123 patent/WO2011095245A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011095245A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102010001606A1 (de) | 2011-08-04 |
EP2532214B1 (de) | 2016-03-23 |
WO2011095245A1 (de) | 2011-08-11 |
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