EP0861576A1 - Generateur de flux de plasma d'arc de configuration fermee - Google Patents
Generateur de flux de plasma d'arc de configuration fermeeInfo
- Publication number
- EP0861576A1 EP0861576A1 EP96934315A EP96934315A EP0861576A1 EP 0861576 A1 EP0861576 A1 EP 0861576A1 EP 96934315 A EP96934315 A EP 96934315A EP 96934315 A EP96934315 A EP 96934315A EP 0861576 A1 EP0861576 A1 EP 0861576A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chambers
- plasma
- jets
- generator according
- generator
- 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
- 239000004020 conductor Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 238000004157 plasmatron Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 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
- H05H1/26—Plasma torches
- H05H1/32—Plasma torches using an arc
- H05H1/44—Plasma torches using an arc using more than one torch
Definitions
- the present invention relates to an arc plasma generator of closed configuration.
- Plasma technology and particularly devices allowing the creation of a closed configuration flow can be used in surface treatment processes (sterilization, cleaning, pickling, modification, depositing coatings and films) of monolithic and dispersed materials , as well as for obtaining and processing chemicals, in the fields of electronics, automotive, metallurgy, chemistry, food industry, medicine and many others areas again.
- Such a device for creating an arc plasma flow of closed configuration having a central zone, of uniform or lowered temperature.
- This device illustrated in the document "Bases of the realization of the method of dynamic plasma treatment of solid surfaces", Koulik P. P. and others, “Plasmokhimia 1987", Moscow 1987, part 2, pp. 58 to 96.
- the document cited above describes a device which contains two pairs of electrode chambers (cathodes and anodes), connected in pairs to direct current sources.
- the parameters of the plasma channels of the electrode chambers correspond to data published in the document "The two-jet plasmatron Frounze", Genbaiev G. G. and V. S. Enguelsht, 1983.
- two arcs light up and form four jets of plasma through which the current flows.
- the orientation in space of the plasma jets is effected by means of external magnetic fields directed relative to the electrode chambers in such a way that the plasma jets coming from the electrode chambers converge and form a common axially symmetrical plasma flow, crossed by the currents (plasma funnel) whose cross section, perpendicular to the axis of symmetry of the flow, has a uniform or lowered temperature zone with respect to the peripheral part of the flow .
- this known plasma generator has the shape of a plasma funnel, which allows the introduction and treatment (transformation) by plasma of different products in different forms (gaseous, liquid or solid) and allows to use this generator with high efficiency for the sterilization of surfaces, their cleaning, pickling, modification and also the deposit of film covering.
- the disadvantage of the generator according to the prior art is that the plasma flow always has a reduced size, determined by the diameter of the resulting plasma flow.
- a larger plasma flow would be useful, provided of course that the closed configuration of the flow is retained because it allows a central zone of uniform or lowered temperature.
- the object of the present invention is to provide an arc flow generator of closed configuration, the cross section of which, perpendicular to the direction of the flow, has an elongated shape (plasma curtain) having a central zone of uniform or lowered temperature.
- the invention relates to an arc plasma flow generator, of closed configuration, comprising electrode chambers working in pairs, each pair having an anode and a cathode and being connected to a direct current source, the generated plasma jets being traversed by the current and oriented in space using an external magnetic field directed so that the plasma jets coming from the chambers converge and form a common plasma flow having a central temperature zone uniform or lowered, said generator comprising at least three pairs of electrode chambers as above, and in that said chambers are arranged with respect to one another so that the assembly has symmetry without, however, all of the rooms are placed on the same circle.
- the generator further comprises one or more orientation magnetic devices (jet) Outside of all the electrode chambers, the generator generating a common plasma stream of closed configuration, having an elongated shape having a central zone of uniform or lowered temperature with respect to the peripheral zone resulting from the convergence of at least six plasma jets.
- orientation magnetic devices jet
- the magnetic device determining the orientation of the plasma jets can be composed, for each electrode chamber, of three sections of magnetic conductor, two of which are arranged perpendicular to the plasma jets and the third between the plasma jets.
- the electrode chambers can be arranged in two groups, the two groups of chambers being able to be arranged in parallel rows, and the rows being able to be rectilinear.
- the electrodes of the same group, respectively of the same row, of chambers are all of the same polarity
- the electrode chambers of a single group, respectively of the same row which can be made in one piece, in one piece
- the same group, respectively the same row, of chambers contains electrodes, of opposite polarities, the electrodes of the same group or of the same row being able to be arranged so as to respect, at least partially, a alternating polarities.
- the solution proposed by the present invention consists roughly in providing the generator with at least one pair of electrode chambers (anodes and cathodes) in addition to the two pairs of electrode chambers (anodes and cathodes) of the known generator according to the document " Koulik ", cited above
- Figure 1 illustrates the generator according to the invention, made so that the electrode chambers are arranged in two parallel and straight rows, the references relating to Figure 1 are as follows
- FIG. 2 shows an electrode chamber in the shape of a parallelepiped of small width of the generator according to the invention, and more particularly the following details, 2a general view; 2b. in 2d sections; the references relating to FIG. 2 are as follows:
- Figure 3 is a schematic view illustrating the orientation of the magnetic control device of the plasma jets, in the plane of the jets, according to the invention, the references relating to Figure 3 are as follows
- Electrode chamber (anode, cathode)
- the electrode chambers are connected, in pairs (formed from an anode with a cathode) to current sources.
- the proposed plasma generator consists of at least six electrode chambers generating six nets of plasma through which the current flows.
- the orientation of the electrode chambers aims to create a plasma curtain and not, as according to the prior art, to form only a plasma funnel.
- the arrangement of the electrode chambers in detx rows can be carried out either so that, in each row, the anode and cathode chambers succeed one another, or that the electrodes of the same row are all of the same type, c ' that is to say all anodes or all cathodes.
- the channels of the electrode chambers through which the current flows are formed by copper diaphragms with dielectric seals.
- the electrodes themselves (copper anode, tungsten cathode) are arranged at the input of the current channels. All parts of the electrode chambers are water cooled.
- the current channels are traversed by the gas forming the plasma.
- the diameter of the electrodes and the diaphragms, as well as their thickness and their number are optimized to obtain jets of plasma of high stability.
- the spatial orientation of the plasma jets is controlled by magnetic field. This orientation control aims to force the plasma jets to keep the direction given by the current channel.
- the plasma jets repel each other when they are of opposite polarities, and they attract in the opposite case.
- the mutual attraction of the jets in the absence of external magnetic fields
- the external magnetic field must, in such a case, act so as to compensate for this attraction and to restore the direction given to the plasma jets by the current channel.
- the plasma jets repel each other, which causes a change in the distances between the different jets downstream of the electrode chambers, or slight differences in gas flow and of inevitable current between the different plasma jets.
- the magnetic device for controlling the jets which contains, in the plane of the jets, three sections of magnetic conductors with winding coils.
- the direction of the current in the coils is given in accordance with the direction of action on the plasma jets.
- the size of the field can be chosen individually for each plasma jet, by varying the current in the coils.
- the magnetic device is installed separately for each pair of electrode chambers (anode and cathode).
- the magnetic conductor, located between the plasma jets, can coincide with the system for introducing the chemical or the treated product into the plasma curtain.
- this arrangement has the advantage that the electrode chambers can be placed one against the other, which reduces the distance between the jets and allows their junction in the high temperature region of the plasma. in this case it is possible to produce the electrode chambers in a single block and the diaphragms in a single body. This also reduces the distance between the jets.
- the electrode chambers have a width of 2 cm and are placed one after the other. They are thus arranged in two parallel rectilinear rows of constant polarity.
- the generator comprises 50 pairs of electrode chamber. The current passing through each pair of chambers is 50 A, the voltage is 100 V, the power of each jet was 5 kW, and the efficiency of the heating of the gas by 50%.
- the plasma curtain, after the junction of the jets has a length of 1 m, a width of 1 cm and a total power of 125 kW.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Plasma Technology (AREA)
Abstract
Description
Claims
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH3210/95 | 1995-11-13 | ||
| CH321095 | 1995-11-13 | ||
| CH321095 | 1995-11-13 | ||
| PCT/CH1996/000403 WO1997018693A1 (fr) | 1995-11-13 | 1996-11-12 | Generateur de flux de plasma d'arc de configuration fermee |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0861576A1 true EP0861576A1 (fr) | 1998-09-02 |
| EP0861576B1 EP0861576B1 (fr) | 2000-09-06 |
Family
ID=4251042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96934315A Expired - Lifetime EP0861576B1 (fr) | 1995-11-13 | 1996-11-12 | Generateur de flux de plasma d'arc de configuration fermee |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6050215A (fr) |
| EP (1) | EP0861576B1 (fr) |
| JP (1) | JP2000500273A (fr) |
| DE (1) | DE69610221T2 (fr) |
| ES (1) | ES2152043T3 (fr) |
| WO (1) | WO1997018693A1 (fr) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2002212616A1 (en) | 2000-11-10 | 2002-05-21 | Apit Corp. Sa | Atmospheric plasma method for treating sheet electricity conducting materials and device therefor |
| FR2897748B1 (fr) * | 2006-02-20 | 2008-05-16 | Snecma Services Sa | Procede de depot de barriere thermique par torche plasma |
| DE102007019981B4 (de) * | 2007-04-23 | 2011-04-14 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Anode für die Bildung eines Plasmas durch Ausbildung elektrischer Bogenentladungen |
| CN114567959A (zh) * | 2022-02-15 | 2022-05-31 | 中科等离子体科技(合肥)有限公司 | 一种电弧等离子体发生器 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2039566A5 (fr) * | 1969-03-31 | 1971-01-15 | Soudure Autogene Elect | |
| BE763709A (fr) * | 1971-03-03 | 1971-08-02 | Soudure Autogene Elect | Plasma en rideau. |
| US3940641A (en) * | 1974-04-05 | 1976-02-24 | Reynolds Metals Company | Plasma jet electrode for magnetohydrodynamic generators |
| JPS5546266A (en) * | 1978-09-28 | 1980-03-31 | Daido Steel Co Ltd | Plasma torch |
| GB2271124B (en) * | 1990-12-26 | 1995-09-27 | Opa | Method and apparatus for plasma treatment of a material |
-
1996
- 1996-11-12 DE DE69610221T patent/DE69610221T2/de not_active Expired - Fee Related
- 1996-11-12 WO PCT/CH1996/000403 patent/WO1997018693A1/fr not_active Ceased
- 1996-11-12 JP JP9518474A patent/JP2000500273A/ja active Pending
- 1996-11-12 EP EP96934315A patent/EP0861576B1/fr not_active Expired - Lifetime
- 1996-11-12 ES ES96934315T patent/ES2152043T3/es not_active Expired - Lifetime
- 1996-11-12 US US09/068,415 patent/US6050215A/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9718693A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000500273A (ja) | 2000-01-11 |
| ES2152043T3 (es) | 2001-01-16 |
| WO1997018693A1 (fr) | 1997-05-22 |
| EP0861576B1 (fr) | 2000-09-06 |
| DE69610221D1 (de) | 2000-10-12 |
| DE69610221T2 (de) | 2001-04-26 |
| US6050215A (en) | 2000-04-18 |
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