EP1494506B1 - Résonateur micro-ondes à hyperfréquences destiné à un traitement thermique - Google Patents

Résonateur micro-ondes à hyperfréquences destiné à un traitement thermique Download PDF

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Publication number
EP1494506B1
EP1494506B1 EP04007895A EP04007895A EP1494506B1 EP 1494506 B1 EP1494506 B1 EP 1494506B1 EP 04007895 A EP04007895 A EP 04007895A EP 04007895 A EP04007895 A EP 04007895A EP 1494506 B1 EP1494506 B1 EP 1494506B1
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EP
European Patent Office
Prior art keywords
microwave
resonator
coupling
section
cross
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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.)
Expired - Lifetime
Application number
EP04007895A
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German (de)
English (en)
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EP1494506A3 (fr
EP1494506A2 (fr
Inventor
Lambert Dr. Feher
Guido Dr. Link
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Karlsruher Institut fuer Technologie KIT
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Karlsruher Institut fuer Technologie KIT
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6402—Aspects relating to the microwave cavity
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/04—Heating using microwaves
    • H05B2206/044—Microwave heating devices provided with two or more magnetrons or microwave sources of other kind

Definitions

  • the invention relates to a modular microwave resonator and a thermal region of a process line formed therefrom.
  • the microwave resonator is dimensioned geometrically such that, due to the coupled-in microwave, starting from the fundamental mode, a sufficient number of modes are formed which enable an overlay in such a way that the intensity effective in the resonator volume becomes sufficiently close to the uniformity required for industrial processing , Choice of frequency, geometry of the applicator, as well as the coupling determine the nature of the overlapping wave field.
  • a monomode resonator a sharp, pure geometric mode is excited, which generally has a very inhomogeneous distribution. To allow more modes, the applicator volume must be significantly increased.
  • the device consists of a heating chamber, through which the material to be processed is transported.
  • the heating chamber has a wall portion which is concavely curved. At this is the coupled microwave reflected and focused on the volume of material to be heated.
  • a comparable device shows the WO 90/03714 , There, the heating chamber is used for food heating in order to try to surround the food volume to be heated with a volume in which an electromagnetic field with still tolerable deviation from homogeneity exists, so that a more uniform temperature field is established.
  • the heating chamber is widened by a second reflection wall opposite the first reflection wall, with the aim of fulfilling the process volume with a reinforced, uniform field in order to achieve a uniform heating of the object.
  • a prismatic, with respect to its longitudinal axis symmetrical cavity with even polygonal cross section is described as a resonator. All surface segments of the resonator are flat.
  • the microwave beam is coupled through a coupling opening in one of the two end walls, its beam axis is inclined to the longitudinal axis, in such a way that at the first reflection, a symmetrical beam splitting takes place.
  • the theoretical Findings for the field division were confirmed mathematically as well as experimentally in good measure. Uniform processing of several bodies that are too glowing or burning can be carried out with reduced rejects.
  • the invention has for its object to enable heating, temperature control and processing of extended sheet materials in the mold for industrial application that, due to extraordinary field homogeneity, by the structural geometry, the type of source and waveguide coupling and tuning frequency and Size of the applicator even sensitive polymer structures can be thermally processed to high quality products with previously unattainable material properties and thus cured.
  • the charge should be possible in a stack-like manner, ie by full packing of the applicator, or in the other embodiment in the flow-through method.
  • the object is achieved by a high-mode microwave resonator according to the characterizing features of claim 1, in which, in addition to the fundamental mode sufficiently many higher modes can form, in particular.
  • the resonator has a prismatic columnar shape with a pentagonal, outwardly curved (convex) cross section.
  • the microwave is via Einkoppelö réelleen in one of the five Jacket sides coupled into the resonator.
  • These coupling openings are line radiators and lie parallel to the edge of the jacket wall.
  • a divergent microwave beam with a beam plane instead of the beam axis, a line beam emerges from each coupling-in opening.
  • the beam planes are directed so that the coupled-in microwave line beam bundles fan out in the resonator and superimpose themselves in a predetermined central volume around and along the longitudinal axis of the resonator to an at least largely homogeneous distribution of the electromagnetic field therein.
  • the frontal access to the resonator is highlighted. This can be from one end face, it is then loaded from there with process material and the same taken from it. However, the resonator can also be used in the pass if access is available via both end faces. A resonator used in this way will then generally stand on one of the five jacket walls, wherein the jacket wall with the coupling openings can be exposed as required. For example, if the resonator is seated on a rack, this casing wall could be the bottom wall at the same time. If required easy accessibility to the microwave equipment, this shell wall may also be exposed to the side or upwards. But this is ultimately determined by process conditions.
  • the entrance into the interior of the resonator is arranged via at least one of the remaining four shell walls except the jacket wall with the coupling openings, preferably via one of these shell wall with coupling openings opposite or both.
  • the resonator could then be placed on an end wall and be cabinet accessible. If he is in this way on wheels or a caster frame, he is also still mobile. In which direction, viewed from the resonator feed and removal, the lateral surface with the coupling openings is exposed, as noted above, depends on the other process conditions. An example is the access to a cabinet with hinged door or folding doors with the microwave equipment on the rear wall.
  • a different electromagnetic field distribution than that formed here about the central longitudinal axis of the resonator can in principle also be set.
  • the decoupled microwave / n reflect on the inner walls of the resonator expanding and not focusing. This is a fundamental prerequisite for a homogeneous field distribution, because focal field peaks, caustics, as in the case of a circular mantle wall, can not occur.
  • microwave components / sources ranging from 100 MHz up to the area of construction of 25 GHz standard.
  • the household microwave is a known device. It works with a magnetron as a microwave source and generates a high frequency of 2.45 GHz. In ceramic sintering, the thermal processing at this frequency but also at about 24.5 GHz makes sense.
  • the coupling property of the process substance plays an important role, which is also still temperature-dependent.
  • the diameter of the Resonatorquerites and the length of the resonator from the field calculations and considerations out to set the required degree of field homogeneity in necessary sub-volume is always greater than the wavelength ⁇ of the applied microwave, preferably 2 ⁇ .
  • the resonator with semi-hexagonal cross section is constructed in frame construction of aluminum profiles, such as FIG. 2 shows.
  • He is a laboratory setup.
  • the shell walls are made of aluminum sheet, which is attached to the frame from the inside.
  • the two end faces are here perforated sheets, which are pivotable on the bottom frame via a hinge.
  • the right coupling device has on its rear forehead, on the rear resonator end wall, the microwave source, a magnetron, sitting with tuning unit (slide sit) for adjustment.
  • FIG. 2 This is indicated by the hose feeders and visible rectangular parts.
  • the microwave source of the parallel opposite coupling device sits in front of the bottom left corner in the figure accordingly.
  • FIG. 1 shows its position in the resonator cross section.
  • the resonator cross section is convex pentagonal and can be completed by mirroring at the base edge to a regular hexagon, as in FIG. 1 shown.
  • FIG. 1 is on the left in the figure source of the beam path of the coupling-out microwave beam with its point-dashed beam axis, correct beam plane, indicated.
  • the left ray representation in the picture reflects twice, on the side wall and left roof wall, the right only at this Roof wall. More leads to confusion and is therefore omitted.
  • the technical data are exemplary.
  • this resonator plates and band-shaped green bodies were cured in homogeneous or composite form over the action of the coupled microwave depending on the extent in a short time for dimensional stability and optionally for mechanical stability.
  • a green sheet of CFRP material 3 mm thick and 20 cm 2, can thus over cross section and area in less than 20 minutes. evenly cured, fuel cell membranes in less than 5 minutes. This is only possible in several hours in a classic autoclave with purely thermal action over the surface of the article.
  • FIG. 3 shows the energy density distribution over the central cross section. In the upper half, in the central area, there is a relatively uniformly uniform distribution, which in this central area is characterized by only slight fluctuations. Strong also occur the two immediate Einkoppel Schemee with the respectively connected rectangular waveguide cross section.
  • FIG. 4 the distribution is shown perpendicular thereto in the center plane to the base plate along the longitudinal center. Process articles which are exposed in the partial volume of the resonator in which these useful, little fluctuating field conditions exist and are exposed to the microwave are uniformly shaped-solidified in the comparatively short process times. In both planes considered, the largest variation is less than 5%.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Drying Of Semiconductors (AREA)

Claims (10)

  1. Résonateur micro-ondes en mode élevé pour le traitement thermique de matériaux selon lequel,
    le résonateur a une forme de colonne prismatique à section pentagonale courbée vers l'extérieur,
    caractérisé en ce que
    a) parallèlement aux deux arêtes de l'enveloppe de l'une des cinq parois enveloppes, dans celle-ci il y a au moins deux dispositifs d'injection de forme linéaire analogue pour des micro-ondes par lesquels les micro-ondes sont injectées respectivement sous la forme d'un faisceau linéaire dans le résonateur,
    b) on utilise une source de micro-ondes respective par dispositif d'injection, et
    c) les deux sources de micro-ondes sont pulsées avec un rapport de largeur d'impulsion commandé de façon à pouvoir régler en continu une puissance de micro-ondes allant de zéro à un maximum nominal, et
    d) les micro-ondes injectées se combinent dans le résonateur.
  2. Résonateur micro-ondes selon la revendication 1,
    caractérisé en ce que
    la section du résonateur est à symétrie plane par rapport aux bissectrices des côtés de la ligne de base de la section.
  3. Résonateur micro-ondes selon la revendication 2,
    caractérisé en ce que
    les deux parois latérales adjacentes à la surface de base du résonateur, sont perpendiculaires à celui-ci.
  4. Résonateur micro-ondes selon la revendication 3,
    caractérisé en ce que
    la section du résonateur est la moitié symétrique d'une section hexagonale-semi-hexagonale.
  5. Résonateur micro-ondes selon la revendication 4,
    caractérisé en ce que
    la source respective de micro-ondes des deux dispositifs d'injection situés à l'extérieur est montée sur le même côté frontal ou sur des côtés frontaux opposés du résonateur.
  6. Résonateur micro-ondes selon la revendication 5,
    caractérisé en ce que
    les orifices d'injection des micro-ondes sont fermés/couverts par un diélectrique transparent aux micro-ondes internes au procédé et vis-à-vis de l'environnement.
  7. Résonateur micro-ondes selon la revendication 6,
    caractérisé en ce qu'
    il est accessible par au moins l'une de ses deux parois frontales.
  8. Résonateur micro-ondes selon la revendication 6,
    caractérisé en ce qu'
    il est accessible par au moins l'une des parois enveloppes qui font face à la paroi enveloppe munie des orifices d'injection.
  9. Résonateur micro-ondes selon l'une des revendications 7 et 8,
    caractérisé en ce qu'
    une autre parallèle se situe entre les deux orifices d'injection situés du côté extérieur et par laquelle au moins une micro-onde de puissance réglable peut être injectée pour adapter l'homogénéité du champ.
  10. Résonateur micro-ondes selon la revendication 9,
    caractérisé en ce que
    les parois intérieures du résonateur ont une ondulation w de l'ordre de : λ / 16 < w < λ / 2
    Figure imgb0006
EP04007895A 2003-07-01 2004-04-01 Résonateur micro-ondes à hyperfréquences destiné à un traitement thermique Expired - Lifetime EP1494506B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10329412A DE10329412B4 (de) 2003-07-01 2003-07-01 Hochmodiger Mikrowellenresonator zur thermischen Prozessierung
DE10329412 2003-07-01

Publications (3)

Publication Number Publication Date
EP1494506A2 EP1494506A2 (fr) 2005-01-05
EP1494506A3 EP1494506A3 (fr) 2008-01-23
EP1494506B1 true EP1494506B1 (fr) 2010-07-14

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EP04007895A Expired - Lifetime EP1494506B1 (fr) 2003-07-01 2004-04-01 Résonateur micro-ondes à hyperfréquences destiné à un traitement thermique

Country Status (4)

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EP (1) EP1494506B1 (fr)
AT (1) ATE474437T1 (fr)
DE (2) DE10329412B4 (fr)
ES (1) ES2348391T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021126661B4 (de) 2021-10-14 2024-03-14 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kraftfahrzeugstoßfänger

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4631380A (en) * 1983-08-23 1986-12-23 Durac Limited System for the microwave treatment of materials
NZ220550A (en) * 1986-06-05 1990-10-26 Nearctic Research Centre Austr Microwave drier cavity: configuration maximises energy in drying zone while minimising energy reflected back to source
GB8822703D0 (en) * 1988-09-28 1988-11-02 Core Consulting Group Microwave-powered heating chamber
JPH0754744B2 (ja) * 1990-09-26 1995-06-07 財団法人ファインセラミックスセンター マイクロ波加熱装置及びマイクロ波加熱方法
DE4313806A1 (de) * 1993-04-27 1994-11-03 Rene Salina Vorrichtung zum Erhitzen von Materialien in einer mit Mikrowellen bestrahlbaren Heizkammer und Verfahren zum Herstellen von keramischem Gut, bei dem das Rohgut mittels Mikrowellen getrocknet wird
US5532462A (en) * 1994-04-29 1996-07-02 Communications & Power Industries Method of and apparatus for heating a reaction vessel with microwave energy
KR100487733B1 (ko) * 1996-05-17 2005-08-09 테크놀러지 파이낸스 코퍼레이션(프로프리어터리) 리미티드 유전가열장치
GB2315654B (en) * 1996-07-25 2000-08-09 Ea Tech Ltd Radio-frequency and microwave-assisted processing of materials
DE19633245C1 (de) * 1996-08-17 1997-11-27 Karlsruhe Forschzent Hochmodiger Mikrowellenresonator für die Hochtemperaturbehandlung von Werkstoffen
SE517608C2 (sv) * 1999-03-22 2002-06-25 Leif Goesta Zettergren Förfarande för värmebehandling
DE20006527U1 (de) * 2000-04-08 2000-09-28 Prozesautomation Kohler Gmbh Schlitz-Hohlleiter
AUPR346001A0 (en) * 2001-03-01 2001-03-29 BKW Investments Pty Ltd An apparatus for heating a food product and a heating device and feed assembly therefor

Also Published As

Publication number Publication date
DE10329412B4 (de) 2005-09-22
ES2348391T3 (es) 2010-12-03
DE10329412A1 (de) 2005-02-03
DE502004011386D1 (de) 2010-08-26
ATE474437T1 (de) 2010-07-15
EP1494506A3 (fr) 2008-01-23
EP1494506A2 (fr) 2005-01-05

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