EP0277342A2 - Procédé et dispositif pour homogénéiser l'échauffement d'aliments dans un appareil de cuisson chauffant à micro-ondes - Google Patents

Procédé et dispositif pour homogénéiser l'échauffement d'aliments dans un appareil de cuisson chauffant à micro-ondes Download PDF

Info

Publication number
EP0277342A2
EP0277342A2 EP87118985A EP87118985A EP0277342A2 EP 0277342 A2 EP0277342 A2 EP 0277342A2 EP 87118985 A EP87118985 A EP 87118985A EP 87118985 A EP87118985 A EP 87118985A EP 0277342 A2 EP0277342 A2 EP 0277342A2
Authority
EP
European Patent Office
Prior art keywords
waveguide
rotating body
rear wall
microwaves
cooking
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
EP87118985A
Other languages
German (de)
English (en)
Other versions
EP0277342A3 (en
EP0277342B1 (fr
Inventor
Gerd Dr. Naumann
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.)
Electrolux Juno Kuchentechnik GmbH
Original Assignee
Electrolux Juno Kuchentechnik GmbH
Buderus Kuechentechnik 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 Electrolux Juno Kuchentechnik GmbH, Buderus Kuechentechnik GmbH filed Critical Electrolux Juno Kuchentechnik GmbH
Priority to AT87118985T priority Critical patent/ATE91375T1/de
Publication of EP0277342A2 publication Critical patent/EP0277342A2/fr
Publication of EP0277342A3 publication Critical patent/EP0277342A3/de
Application granted granted Critical
Publication of EP0277342B1 publication Critical patent/EP0277342B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H05B6/70—Feed lines
    • H05B6/707—Feed lines using waveguides
    • 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
    • H05B6/74—Mode transformers or mode stirrers
    • H05B6/745—Rotatable stirrers

Definitions

  • the invention relates to a method for equalizing the heating of food in a microwave oven heated cooking device and an apparatus for performing this method.
  • the microwaves generated by a magnetron are fed into a cooking chamber which acts as a resonance chamber and which is enclosed by the metallic walls of the cooking muffle. It is possible to feed the magnetron output probe directly into the cooking space.
  • a cooking chamber which acts as a resonance chamber and which is enclosed by the metallic walls of the cooking muffle. It is possible to feed the magnetron output probe directly into the cooking space.
  • rotating antennas which move the microwave field relative to the food at rest.
  • the direct feeding of the microwaves into the cooking space entails great difficulties in adapting the magnetron to different loads in the cooking space, such a construction is very complex. Because of the different resonance structure of the cooking chamber, the heating remains uneven.
  • the object of the invention is to remedy the disadvantage of microwave ovens, namely that the material to be heated is inhomogeneously heated due to an uneven field distribution, by a simple measure.
  • the undesirable change in the load impedance of the magnetron under different loading conditions is used to bring about a change in frequency of the magnetron and thereby achieve a uniform heating of the food.
  • the periodic change in the wave resistance results in a periodic change in the output frequency of the magnetron and this change in frequency causes the excitation of different forms of resonance in the cooking chamber serving as a resonator.
  • the superimposition of different resonance forms leads to an overall uniform heating result.
  • the waveguide 3 is arranged between the magentron 1 generating the microwaves and the cooking chamber 2.
  • the rotating body 5 In front of the rear wall 4 of the end of the waveguide 3 facing away from the magnetron, the rotating body 5 is arranged, which consists of a plate running parallel to the rear wall and rotatable about its central longitudinal axis.
  • the wave resistance of the magnetron 1 through the waveguide 3 via the coupling opening 6 into the cooking space can be changed periodically by the rotating body 5.
  • This change in the input resistance of the furnace affects the magnetron 1 by periodically changing its output frequency.
  • the change at an output frequency of 2.450 GHz can be up to ⁇ 10 MHz, which results in a superposition of different resonance forms. This leads to an even heating of the food.
  • the effect of the device according to the invention is not based on the deflection of the microwaves by a complicated "wave stirrer", but on the "change in length" of the waveguide, which couples the microwaves into the cooking space. This is done by a simple sheet metal part. While the waveguide is shortened in the position of the plate of the rotating body shown, this plate is practically ineffective in the dashed position. When the plate rotates in the direction of the arrow, the wave resistance changes constantly and periodically.
  • the coupling opening 6 is covered in a known manner by a wall 7 which is permeable to microwaves and which prevents harmful influences from acting on the magnetron from the cooking space. High-temperature resistant dielectric materials such as ceramics or borosilicate glass are common for this.
  • the rotating body 5 has a good effect if it is located at a distance between ⁇ / 4 and ⁇ / 2 from the rear wall 4 and above the coupling opening 6.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Ovens (AREA)
  • General Preparation And Processing Of Foods (AREA)
EP87118985A 1987-02-03 1987-12-21 Procédé et dispositif pour homogénéiser l'échauffement d'aliments dans un appareil de cuisson chauffant à micro-ondes Expired - Lifetime EP0277342B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87118985T ATE91375T1 (de) 1987-02-03 1987-12-21 Verfahren u. vorrichtung zur vergleichmaessigung der erwaermung von speisen in einem mit mikrowellenenergie beheizten gargeraet.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873703133 DE3703133A1 (de) 1987-02-03 1987-02-03 Verfahren und vorrichtung zur vergleichmaessigung der erwaermung von speisen in einem mit mikrowellenenergie beheizten gargeraet
DE3703133 1987-02-03

Publications (3)

Publication Number Publication Date
EP0277342A2 true EP0277342A2 (fr) 1988-08-10
EP0277342A3 EP0277342A3 (en) 1988-08-31
EP0277342B1 EP0277342B1 (fr) 1993-07-07

Family

ID=6320098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87118985A Expired - Lifetime EP0277342B1 (fr) 1987-02-03 1987-12-21 Procédé et dispositif pour homogénéiser l'échauffement d'aliments dans un appareil de cuisson chauffant à micro-ondes

Country Status (3)

Country Link
EP (1) EP0277342B1 (fr)
AT (1) ATE91375T1 (fr)
DE (2) DE3703133A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0344438A1 (fr) * 1988-05-31 1989-12-06 Bosch-Siemens HausgerÀ¤te GmbH Appareil domestique à micro-ondes
WO1997047161A3 (fr) * 1996-06-03 1998-02-05 Matsushita Electric Industrial Co Ltd Appareil de chauffage a micro-ondes
EP2187702A1 (fr) * 2008-11-17 2010-05-19 Topinox Sarl Appareil de cuisson doté d'un chauffage à micro-ondes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3843039A1 (de) * 1988-12-21 1990-06-28 Bosch Siemens Hausgeraete Haushaltgeraet

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761942A (en) * 1952-06-06 1956-09-04 Raytheon Mfg Co Heating apparatus
GB752206A (en) * 1953-11-12 1956-07-04 Raytheon Mfg Co Improvements in or relating to high frequency dielectric heating apparatus
FR1208182A (fr) * 1957-12-10 1960-02-22 Miwag Mikrowellen A G Dispositif pour engendrer une distribution primaire définie de champ dans une cavité en vue de chauffer des substances organiques au moyen d'hyperfréquences
CH393577A (de) * 1961-12-13 1965-06-15 Patelhold Patentverwertung Vorrichtung zum dielektrischen Erwärmen von Stoffen
US3521019A (en) * 1968-02-19 1970-07-21 Varian Associates Microwave heating cavity with a venetian blind mode stirrer
SE345903B (fr) * 1970-12-21 1972-06-12 Philips Svenska Ab
US4301347A (en) * 1980-08-14 1981-11-17 General Electric Company Feed system for microwave oven
US4336434A (en) * 1980-08-15 1982-06-22 General Electric Company Microwave oven cavity excitation system employing circularly polarized beam steering for uniformity of energy distribution and improved impedance matching

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0344438A1 (fr) * 1988-05-31 1989-12-06 Bosch-Siemens HausgerÀ¤te GmbH Appareil domestique à micro-ondes
WO1997047161A3 (fr) * 1996-06-03 1998-02-05 Matsushita Electric Industrial Co Ltd Appareil de chauffage a micro-ondes
US6114677A (en) * 1996-06-03 2000-09-05 Matsushita Electric Industrial Co., Ltd. Microwave heating apparatus having a metal plate rotatably disposed in a wave guide
EP2187702A1 (fr) * 2008-11-17 2010-05-19 Topinox Sarl Appareil de cuisson doté d'un chauffage à micro-ondes

Also Published As

Publication number Publication date
DE3703133A1 (de) 1988-08-11
EP0277342A3 (en) 1988-08-31
DE3786451D1 (de) 1993-08-12
ATE91375T1 (de) 1993-07-15
EP0277342B1 (fr) 1993-07-07

Similar Documents

Publication Publication Date Title
DE2622173C3 (de) Vorrichtung zum Erhitzen eines in eine Heizkammer eingebrachten Gegenstandes
DE2504860C3 (fr)
DE2650681C3 (de) Mikrowellenofen
DE69322017T2 (de) Wellenleitersystem von einem Mikrowellenofen
DE2516622C3 (de) Mikrowellenofen
DE2432488A1 (de) Vorrichtung zur abstuetzung von mittels mikrowellenenergie zu behandelnden gegenstaenden, insbesondere von in einem mikrowellenofen zu erhitzendem brat- oder backgut
DE3310703A1 (de) Mikrowellenkochgeraet
DE2058901C3 (de) Hochfrequenzheizgerät
DE112015000981T5 (de) Mikrowellen-Behandlungsvorrichtung
DE2232065C3 (de) Mikrowellen-Erhitzungseinrichtung
DE2400021A1 (de) Mikrowellenherd mit wellentyperreger und abstimmvorrichtung
EP0277342B1 (fr) Procédé et dispositif pour homogénéiser l'échauffement d'aliments dans un appareil de cuisson chauffant à micro-ondes
DE3308732A1 (de) Hochfrequnezheizgeraet mit einer rotierenden antenne
DE3711184A1 (de) Vorrichtung zur einbringung von mikrowellenenergie mit einem offenen mikrowellenleiter
DE1051337B (de) Wanderfeldroehre mit einer Wendel als Verzoegerungsleitung
DE2417577C2 (de) Hochfrequenz-Erhitzungsvorrichtung zur Erhitzung eines dielektrischen Materials von langgestreckter Form und geringen Querschnitts
EP0049817B1 (fr) Appareil de chauffage à micro-ondes ayant un dispositif d'étanchéité à la porte servant à éviter la fuite de micro-ondes
DE3331432A1 (de) Hochfrequenzheizgeraet
DE3818490C2 (fr)
DE69408022T2 (de) Vorrichtung mit grosser Blende zur Überwachung der Dicke einer leitenden Beschichtung auf optischen Fasern
DE1523101A1 (de) Mikrowellen-Hohlraumresonator
DE2636633C3 (de) Verzögerungsleitung für Wanderfeldröhren, insbesondere zur Verstärkung von mm-Wellen
DE1615463C3 (de) Ofen mit Abstrahlung von Mikrowellenenergie und mit einem widerstandsbeheizten Metallelement
DE1565259C3 (fr)
DE2450131C3 (de) Stehwellen-Linear-Beschleuniger

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE FR GB IT LI NL

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE FR GB IT LI NL

17P Request for examination filed

Effective date: 19881010

17Q First examination report despatched

Effective date: 19910208

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ELECTROLUX-JUNO KUECHENTECHNIK GMBH

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI NL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19930707

Ref country code: BE

Effective date: 19930707

REF Corresponds to:

Ref document number: 91375

Country of ref document: AT

Date of ref document: 19930715

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3786451

Country of ref document: DE

Date of ref document: 19930812

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19930728

ITF It: translation for a ep patent filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19931206

Year of fee payment: 7

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19931217

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19931221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19931231

Ref country code: CH

Effective date: 19931231

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19940225

Year of fee payment: 7

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19941221

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19941221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19950831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19950901

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051221