EP1152641A2 - Four à micro-ondes destiné au chauffage de matières à chauffer - Google Patents

Four à micro-ondes destiné au chauffage de matières à chauffer Download PDF

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Publication number
EP1152641A2
EP1152641A2 EP01105940A EP01105940A EP1152641A2 EP 1152641 A2 EP1152641 A2 EP 1152641A2 EP 01105940 A EP01105940 A EP 01105940A EP 01105940 A EP01105940 A EP 01105940A EP 1152641 A2 EP1152641 A2 EP 1152641A2
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EP
European Patent Office
Prior art keywords
microwave
cavity resonator
microwave oven
oven according
coupling device
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
EP01105940A
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German (de)
English (en)
Other versions
EP1152641B1 (fr
EP1152641A3 (fr
Inventor
Friedrich Dr. Phys. Raether
Jens Dipl.-Ing. Baber
Peter-A. Dipl.-Ing. Püschner
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.)
PUESCHNER GMBH & CO. KG
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Pueschner & Co KG GmbH
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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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Application filed by Pueschner & Co KG GmbH, Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Pueschner & Co KG GmbH
Publication of EP1152641A2 publication Critical patent/EP1152641A2/fr
Publication of EP1152641A3 publication Critical patent/EP1152641A3/fr
Application granted granted Critical
Publication of EP1152641B1 publication Critical patent/EP1152641B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6491—Aspects related to microwave heating combined with other heating techniques combined with the use of susceptors
    • H05B6/6494—Aspects related to microwave heating combined with other heating techniques combined with the use of susceptors for cooking

Definitions

  • the invention relates to a microwave oven for heating fuel, with at least one microwave source, a cavity resonator, a coupling device for coupling and decoupling a microwave field into the cavity resonator.
  • Microwave heating is different from conventional oven heating the thermal energy is not on the surface of a component, but in Inside introduced.
  • Heating up quickly with heating rates of more than 200 k / min - as is required for many technical processes - are generated by the conventional furnace large temperature gradients between the hotter component surface and the colder interior. With rapid microwave heating temperature gradients also occur - but in the opposite direction.
  • the temperature differences are several hundred Kelvin and lead to Destruction of the components due to thermal stress. Through different Measures were attempted to eliminate these temperature gradients: additional absorbers for microwave energy - so-called susceptors - in the Microwave resonator introduced. These first heat up and give then thermal energy to the component. It will also be used for microwaves transparent insulation - so-called caskets - used, which the firing envelop.
  • the temperature gradients can be with the methods mentioned decrease, however, is a precise and quick control of the energy input over the component surface or the component volume is not possible.
  • hybrid ovens To reduce an undesirably large temperature gradient during heating Various types of hybrid ovens have already been developed for the kiln. They are heated with microwave energy and at the same time with other heating methods: e.g. through resistance heating, gas firing and Infrared radiation. The additional heating processes are used for controlled surface heating of the fired goods. There are numerous patent applications for this (see e.g. DE 196 33 247 C2). However, hybrid ovens are because of the combination two heating technologies per se more complex to manufacture, more complicated to manufacture Control and more error-prone in operation than pure microwave ovens.
  • the object of the invention is to provide a microwave oven of the type mentioned to develop in such a way that even when the fired material heats up very quickly undesirably large temperature gradients between the interior of the Kiln goods and their surface can be avoided.
  • the advantages of the invention are, in particular, that one or more microwave susceptor elements are provided in the cavity, and that the cavity resonator during an operating interval with a first microwave mode is excited at at the positions of the susceptor elements strong microwave field is generated, the volume of the susceptor elements heats up, which then heat energy as radiation energy against the Dispense the firing material and in this way heat the firing material on the surface.
  • the cavity resonator is then operated with a second one Microwave mode excited, which has its maximum in the range of the firing material, so that the volume is then heated by the microwave field while the thermal radiation emitted by the susceptor elements still continues and the Keeps the surface of the fired material at a high temperature.
  • the Resonance conditions changed so that either at the position of the firing material or there is a field strength maximum at the position of the susceptor elements.
  • the susceptors are warmed to a greater extent than the fired material, the dominant dominates the energy input through surface heating. (The susceptors are usually arranged geometrically so that the component surface (s) are even heat.) Conversely, the volume of the fired material can be warmed up more are called the susceptors, so that primarily volume heating takes place.
  • the temperatures of susceptors and firing stock can e.g. with pyrometers be monitored. It was surprisingly found that in this way a very quick and precise control of surface and volume heating possible is. Since only microwave energy is used, a corresponding one can be used Realize the furnace cheaply compared to complicated hybrid heating technologies. In contrast to microwave ovens, in which closed caskets are used the proposed furnace can be combined with in-situ measurement techniques. In this way, the microwave heating process can be constantly monitored and controlled precisely.
  • Another advantage of the invention is that a combination with an external radiant heating is possible - through additional windows Component surface are exposed to thermal energy. These windows can also be used to quickly change components in series production to ensure.
  • Fig. 1 shows a schematic diagram of a microwave oven 1, for fast Surface heating and volume heating of firing stock is used.
  • a cavity resonator 2 has a cylindrical shape and has on both ends 3 each have a coupling device 4, which is used to couple in and out Microwave energy is used.
  • the cavity resonator 2 is on in its interior its inner surface lined with insulating material 8 to prevent heat loss reduce to the outside.
  • susceptor elements 10 positioned, which is designed as disks in the illustrated embodiment are.
  • the peripheral wall 7 of the cavity resonator 2 has two windows 6, outside the window is a pyrometer 22 for measuring the temperature a susceptor element 10, and a second pyrometer 24, which on the Firing material 20 is directed and measures the temperature of the firing material.
  • the insulation material 8 has corresponding channels to the beam path of the pyrometer 22, 24 to release the fuel and the susceptor elements 10.
  • Fig. 2 shows a block diagram of the microwave circuit. This consists of the cavity resonator 2, on the one end side of which a coupling device 4 projects into the cavity resonator 2.
  • a phase shifter 30 is connected to the one coupling device 4 and is connected via a variable impedance 32 to the microwave source 34, for example a magnetron.
  • a coupling device 4 is also provided on the other end face of the cavity resonator 2 and is connected to a variable impedance 32 via a phase shifter 30.
  • One of the phase shifters 30 is designed to be electronically controllable. The resonator is operated in the E 01n mode, so that the microwave field has cylindrical symmetry .
  • phase shifter 30 and variable impedance 32 are referred to as adjusting means and act in the example shown on the coupling device 4 of the cavity resonator 2 in order to change the field configuration in the desired manner.
  • the actuating means can also act directly on the microwave source and / or on the geometric configuration of the cavity resonator 2 or on other elements which are provided in the cavity resonator 2 for the purpose of changing the field configuration.
  • the operating intervals, near which the susceptor elements 10 or the firing material 20 is heated, are timed so that the desired temperature difference is always is maintained between the susceptor elements 10 and the firing material 20.
  • the coupling devices 4 contain projecting into the cavity resonator 2 Antennas, which are preferably hollow on the inside and the feed or in their hollow channel Allow discharge of furnace gas or an in-situ measurement of properties of the firing material or susceptor elements during microwave heating allow. Additional process monitoring is possible, for example, through additional windows possible with CCD cameras.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Furnace Details (AREA)
EP01105940A 2000-05-03 2001-03-09 Four à micro-ondes destiné au chauffage de matières à chauffer Expired - Lifetime EP1152641B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10021528 2000-05-03
DE10021528A DE10021528A1 (de) 2000-05-03 2000-05-03 Mikrowellenofen zum Aufheizen von Brenngut

Publications (3)

Publication Number Publication Date
EP1152641A2 true EP1152641A2 (fr) 2001-11-07
EP1152641A3 EP1152641A3 (fr) 2003-11-26
EP1152641B1 EP1152641B1 (fr) 2006-02-01

Family

ID=7640641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01105940A Expired - Lifetime EP1152641B1 (fr) 2000-05-03 2001-03-09 Four à micro-ondes destiné au chauffage de matières à chauffer

Country Status (3)

Country Link
EP (1) EP1152641B1 (fr)
AT (1) ATE317209T1 (fr)
DE (2) DE10021528A1 (fr)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1775998A1 (fr) * 2005-10-17 2007-04-18 Püschner GmbH & Co. KG Four continu a micro-ondes
US9220576B2 (en) 2003-08-07 2015-12-29 Ivoclar Vivadent Ag Machining of ceramic materials
US9326835B2 (en) 2010-04-16 2016-05-03 Ivoclar Vivadent Ag Process for the preparation of dental restorations
US9371249B2 (en) 2012-05-04 2016-06-21 Ivoclar Vivadent Ag Lithium disilicate-apatite glass-ceramic
US9403714B2 (en) 2011-10-14 2016-08-02 Ivoclar Vivadent Ag Lithium silicate glass ceramic and lithium silicate glass comprising a hexavalent metal oxide
US9695082B2 (en) 2011-10-14 2017-07-04 Ivoclar Vivadent Ag Lithium silicate glass ceramic and lithium silicate glass comprising a tetravalent metal oxide
US9757217B2 (en) 2012-05-11 2017-09-12 Ivoclar Vivadent Ag Pre-sintered blank for dental purposes
US9776912B2 (en) 2011-10-14 2017-10-03 Ivoclar Vivadent Ag Lithium silicate glass ceramic and glass with divalent metal oxide
US9878939B2 (en) 2011-10-14 2018-01-30 Ivoclar Vivadent Ag Lithium silicate glass ceramic and glass with monovalent metal oxide
EP3346801A1 (fr) * 2017-01-04 2018-07-11 Miele & Cie. KG Procédé de traitement de marchandises et dispositifs destinés à la mise en uvre d'un tel procédé
US10064708B2 (en) 2013-02-12 2018-09-04 Ivoclar Vivadent Ag Blank for dental purposes
US10131569B2 (en) 2014-05-13 2018-11-20 Ivoclar Vivadent Ag Method for the preparation of lithium silicate glasses and lithium silicate glass ceramics
US10136973B2 (en) 2003-08-07 2018-11-27 Ivoclar Vivadent Ag Lithium silicate materials
US10214443B2 (en) 2005-02-08 2019-02-26 Ivoclar Vivadent Ag Lithium silicate materials
US10227255B2 (en) 2011-10-14 2019-03-12 Ivoclar Vivadent Ag Lithium silicate glass ceramic and lithium silicate glass comprising a pentavalent metal oxide
US10321980B2 (en) 2011-10-14 2019-06-18 Ivoclar Vivadent Ag Lithium silicate glass ceramic and glass with trivalent metal oxide
US10376343B2 (en) 2013-04-15 2019-08-13 Ivoclar Vivadent Ag Lithium silicate glass ceramic and glass with rubidium oxide content
US10457589B2 (en) 2015-01-30 2019-10-29 Ivoclar Vivadent Ag Lithium silicate diopside glass ceramics
US10470854B2 (en) 2012-05-11 2019-11-12 Ivoclar Vivadent Ag Pre-sintered blank for dental purposes

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008015483B4 (de) * 2008-03-25 2018-10-11 Ivoclar Vivadent Ag Ofen zur thermischen Behandlung eines dentalen Brennobjektes
EP2377830B1 (fr) 2010-04-16 2016-04-13 Ivoclar Vivadent AG Vitrocéramique et verre à base du silicate de lithium ayant d'oxyde de métal de transition

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1233030A (fr) * 1967-10-13 1971-05-26
WO1995005058A1 (fr) * 1993-08-10 1995-02-16 Ea Technology Limited Traitement de materiaux assiste par micro-ondes
DE19633247A1 (de) * 1996-08-17 1998-02-19 Karlsruhe Forschzent Mikrowellenofen zur Sinterung von Sintergut und Verfahren zur Temperaturgradientenreduzierung im Sintergut
DE19700140A1 (de) * 1997-01-04 1998-07-09 Gero Hochtemperaturoefen Gmbh Brennofen für die Hochtemperaturbehandlung von Materialien mit niedrigem dielektrischem Verlustfaktor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4446349A (en) * 1983-01-03 1984-05-01 General Electric Company Microwave phase shifting device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1233030A (fr) * 1967-10-13 1971-05-26
WO1995005058A1 (fr) * 1993-08-10 1995-02-16 Ea Technology Limited Traitement de materiaux assiste par micro-ondes
DE19633247A1 (de) * 1996-08-17 1998-02-19 Karlsruhe Forschzent Mikrowellenofen zur Sinterung von Sintergut und Verfahren zur Temperaturgradientenreduzierung im Sintergut
DE19700140A1 (de) * 1997-01-04 1998-07-09 Gero Hochtemperaturoefen Gmbh Brennofen für die Hochtemperaturbehandlung von Materialien mit niedrigem dielektrischem Verlustfaktor

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9220576B2 (en) 2003-08-07 2015-12-29 Ivoclar Vivadent Ag Machining of ceramic materials
US11744685B2 (en) 2003-08-07 2023-09-05 Ivoclar Vivadent Ag Lithium silicate materials
US11369460B2 (en) 2003-08-07 2022-06-28 Ivoclar Vivadent Ag Lithium silicate materials
US11109949B2 (en) 2003-08-07 2021-09-07 Ivoclar Vivadent Ag Lithium silicate materials
US10136973B2 (en) 2003-08-07 2018-11-27 Ivoclar Vivadent Ag Lithium silicate materials
US9918806B2 (en) 2003-08-07 2018-03-20 Ivoclar Vivadent Ag Machining of ceramic materials
US10981823B2 (en) 2005-02-08 2021-04-20 Ivoclar Vivadent Ag Lithium silicate materials
US10214443B2 (en) 2005-02-08 2019-02-26 Ivoclar Vivadent Ag Lithium silicate materials
EP1775998A1 (fr) * 2005-10-17 2007-04-18 Püschner GmbH & Co. KG Four continu a micro-ondes
US9956146B2 (en) 2010-04-16 2018-05-01 Ivoclar Vivadent Ag Process for the preparation of dental restorations
US9326835B2 (en) 2010-04-16 2016-05-03 Ivoclar Vivadent Ag Process for the preparation of dental restorations
US10321980B2 (en) 2011-10-14 2019-06-18 Ivoclar Vivadent Ag Lithium silicate glass ceramic and glass with trivalent metal oxide
US10227255B2 (en) 2011-10-14 2019-03-12 Ivoclar Vivadent Ag Lithium silicate glass ceramic and lithium silicate glass comprising a pentavalent metal oxide
US9403714B2 (en) 2011-10-14 2016-08-02 Ivoclar Vivadent Ag Lithium silicate glass ceramic and lithium silicate glass comprising a hexavalent metal oxide
US10098716B2 (en) 2011-10-14 2018-10-16 Ivoclar Vivadent Ag Lithium silicate glass ceramic and glass with hexavalent metal oxide
US9695082B2 (en) 2011-10-14 2017-07-04 Ivoclar Vivadent Ag Lithium silicate glass ceramic and lithium silicate glass comprising a tetravalent metal oxide
US9878939B2 (en) 2011-10-14 2018-01-30 Ivoclar Vivadent Ag Lithium silicate glass ceramic and glass with monovalent metal oxide
US10160687B2 (en) 2011-10-14 2018-12-25 Ivoclar Vivadent Ag Lithium silicate glass ceramic and glass with tetravalent metal oxide
US10358380B2 (en) 2011-10-14 2019-07-23 Ivoclar Vivadent Ag Lithium silicate glass ceramic and glass with divalent metal oxide
US9776912B2 (en) 2011-10-14 2017-10-03 Ivoclar Vivadent Ag Lithium silicate glass ceramic and glass with divalent metal oxide
US9764982B2 (en) 2012-05-04 2017-09-19 Ivoclar Vivadent Ag Lithium disilicate apatite glass-ceramic
US9371249B2 (en) 2012-05-04 2016-06-21 Ivoclar Vivadent Ag Lithium disilicate-apatite glass-ceramic
US10206761B2 (en) 2012-05-11 2019-02-19 Ivoclar Vivadent Ag Pre-sintered blank for dental purposes
US10470854B2 (en) 2012-05-11 2019-11-12 Ivoclar Vivadent Ag Pre-sintered blank for dental purposes
US9757217B2 (en) 2012-05-11 2017-09-12 Ivoclar Vivadent Ag Pre-sintered blank for dental purposes
US10064708B2 (en) 2013-02-12 2018-09-04 Ivoclar Vivadent Ag Blank for dental purposes
US10376343B2 (en) 2013-04-15 2019-08-13 Ivoclar Vivadent Ag Lithium silicate glass ceramic and glass with rubidium oxide content
US10737972B2 (en) 2014-05-13 2020-08-11 Ivoclar Vivadent Ag Method for the preparation of lithium silicate glasses and lithium silicate glass ceramics
US10131569B2 (en) 2014-05-13 2018-11-20 Ivoclar Vivadent Ag Method for the preparation of lithium silicate glasses and lithium silicate glass ceramics
US10457589B2 (en) 2015-01-30 2019-10-29 Ivoclar Vivadent Ag Lithium silicate diopside glass ceramics
EP3346801A1 (fr) * 2017-01-04 2018-07-11 Miele & Cie. KG Procédé de traitement de marchandises et dispositifs destinés à la mise en uvre d'un tel procédé

Also Published As

Publication number Publication date
EP1152641B1 (fr) 2006-02-01
DE10021528A1 (de) 2001-11-22
DE50108820D1 (de) 2006-04-13
EP1152641A3 (fr) 2003-11-26
ATE317209T1 (de) 2006-02-15

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