EP0380158A2 - Enceinte à micro-ondes - Google Patents

Enceinte à micro-ondes Download PDF

Info

Publication number: EP0380158A2
Authority: EP; European Patent Office
Prior art keywords: microwave; housing; metallic conductor; impedance; designed
Prior art date: 1989-01-21
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

EP90200107A

Other languages

German (de)

English (en)

Other versions

EP0380158B1 (fr

EP0380158A3 (fr

Inventor

Walter Braun

Günter Bopp

Dieter Grimm

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.)

Bauknecht Hausgeraete GmbH

Whirlpool Europe BV

Original Assignee

Bauknecht Hausgeraete GmbH

Whirlpool Europe BV

Whirlpool International BV

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.)

1989-01-21

Filing date

1990-01-16

Publication date

1990-08-01

1990-01-16 Application filed by Bauknecht Hausgeraete GmbH, Whirlpool Europe BV, Whirlpool International BV filed Critical Bauknecht Hausgeraete GmbH

1990-08-01 Publication of EP0380158A2 publication Critical patent/EP0380158A2/fr

1991-12-27 Publication of EP0380158A3 publication Critical patent/EP0380158A3/fr

1993-09-29 Application granted granted Critical

1993-09-29 Publication of EP0380158B1 publication Critical patent/EP0380158B1/fr

2010-01-16 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

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
- H05B6/647—Aspects related to microwave heating combined with other heating techniques
- H05B6/6482—Aspects related to microwave heating combined with other heating techniques combined with radiant heating, e.g. infrared heating

Definitions

the invention relates to microwave housings with a characteristic cavity impedance for microwaves that can be fed into the housing and with at least one metallic conductor arranged in the housing, e.g. B. cooking chamber of a microwave oven with a radiant heater arranged in the cooking chamber, precautions being taken to prevent microwaves from escaping through the feeds of the radiant heater.
a characteristic cavity impedance for microwaves that can be fed into the housing and with at least one metallic conductor arranged in the housing, e.g. B. cooking chamber of a microwave oven with a radiant heater arranged in the cooking chamber, precautions being taken to prevent microwaves from escaping through the feeds of the radiant heater.
Metallic conductors act as an antenna in the microwave field. If such conductors are electrically insulated in a room into which microwave energy is fed in, they interfere with the field distribution, absorb some of the microwave energy and heat up very strongly in the process. In the vicinity of other metallic parts or the edges of microwave devices, there are high electrical field strengths and arcing. If metallic conductors are passed through the metal walls of a microwave oven, strong microwave scattered radiation can occur on the passage.
a metallic Surround shield which is conductively connected to the housing, so high currents occur within the shield and between the housing and shield. With increased contact resistance, e.g. B. due to corrosion, the function of the shield is impaired. Sparking and microwave radiation can occur.
the invention has for its object to prevent in a simple and reliable manner that energy from the metallic conductors located in a microwave field is undesirably absorbed and conducted to the outside.
This object is prevented in a microwave housing of the type mentioned in the introduction in that the metallic conductor is designed in such a way that the effect caused by its special geometric design Impedance in the microwave field formed in the housing leads to a mismatch. Due to the mismatch of the metallic conductor, the microwave is largely reflected without loss.
the impedance of the metallic conductor is preferably so much greater than the characteristic impedance of the housing containing the microwave that the induction of currents in the conductor is largely prevented.
the mismatched metallic conductor designed according to the invention can thus be attached in the microwave field without shielding.
B. can be a single-layer cylindrical coil. Methods for calculating the impedance of single-layer coils are known. In the microwave devices used in the household, the characteristic impedance of an empty cooking space is e.g. B. 200 to 500 ohms, with load about 1,000 to 2,000 ohms.
a conductor designed in this way heats up hardly in the microwave field and has little influence on the field distribution. The wave propagation along the conductor is low, a microwave-tight implementation can thus be carried out with little effort.
a microwave oven for. B. at least one radiant heater may be provided as a metallic conductor, e.g. B. a halogen tube or an infrared heater, the filament is also mismatched by winding.
a metallic conductor e.g. B. a halogen tube or an infrared heater
the filament is also mismatched by winding.
a metallic conductor z.
a measuring element (sensor) with mismatched, helical conductors serving as measuring line may be provided.
the spiral design of thermocouples or resistance wire makes it possible to carry out temperature measurements within the microwave field without significantly influencing it. This z. B. the use of a temperature sensor for regulating the supply of microwave energy in the cooking space possible.
a metallic conductor which is mismatched in the microwave field is used as the measurement line.
a moisture sensor or a sensor for measuring the intensity distribution of a microwave field can be provided.
the figure shows a household microwave oven 10 with a microwave-tight housing or cooking space 11.
microwave energy is fed into the cooking space 11 by a microwave generator 12 via an antenna 13, so that a microwave field is formed within the cooking space.
two infrared heating elements 14 are provided as metallic conductors, the heating wire of which is designed as a coiled coil in the area of the entire cooking space 11 and in the area of the bushings 15. According to the invention, this coiled conductor can be arranged within the cooking space without a microwave shielding.
the power supply in the area of the bushings 15 (z. B. with 50 Hz alternating current) is also for the microwave frequency, for. B.

Landscapes

Physics & Mathematics (AREA)
Electromagnetism (AREA)
Control Of High-Frequency Heating Circuits (AREA)
Non-Reversible Transmitting Devices (AREA)
Constitution Of High-Frequency Heating (AREA)
Resistance Heating (AREA)

EP90200107A 1989-01-21 1990-01-16 Enceinte à micro-ondes Expired - Lifetime EP0380158B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE3901676A DE3901676A1 (de)	1989-01-21	1989-01-21	Mikrowellengehaeuse
DE3901676		1989-01-21

Publications (3)

Publication Number	Publication Date
EP0380158A2 true EP0380158A2 (fr)	1990-08-01
EP0380158A3 EP0380158A3 (fr)	1991-12-27
EP0380158B1 EP0380158B1 (fr)	1993-09-29

Family

ID=6372486

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP90200107A Expired - Lifetime EP0380158B1 (fr)	1989-01-21	1990-01-16	Enceinte à micro-ondes

Country Status (2)

Country	Link
EP (1)	EP0380158B1 (fr)
DE (2)	DE3901676A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0573750A3 (fr) *	1992-06-10	1994-03-09	Whirlpool Europ
WO1997023756A1 (fr) *	1995-12-22	1997-07-03	Daewoo Electronics Co., Ltd.	Four a micro-ondes possedant un dispositif de chauffage
WO1998034436A1 (fr) *	1997-01-30	1998-08-06	Whirlpool Corporation	Element de gril

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE3245033C2 (de) *	1981-12-05	2003-05-28	Papst Licensing Gmbh & Co Kg	Kollektorloser Gleichstrommotor
DE4322946A1 (de) *	1993-07-09	1995-01-12	Miele & Cie	Mikrowellengerät mit Strahlungsheizkörper außerhalb des Garraumes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4096369A (en) *	1975-11-20	1978-06-20	Matsushita Electric Industrial Co., Ltd.	Microwave oven
DE2909243C2 (de) *	1979-03-09	1981-03-12	Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt	Kombinationsherd zum Garen von Speisen mit Wärmeenergie und/oder Mikrowellenenergie und mit einer Einrichtung zum pyrolytischen Reinigen
WO1981003536A1 (fr) *	1980-06-04	1981-12-10	Matsushita Electric Industrial Co Ltd	Four de cuisson
US4486639A (en) *	1982-07-19	1984-12-04	Control Data Corporation	Microwave oven quartz lamp heaters

1989
- 1989-01-21 DE DE3901676A patent/DE3901676A1/de not_active Withdrawn
1990
- 1990-01-16 EP EP90200107A patent/EP0380158B1/fr not_active Expired - Lifetime
- 1990-01-16 DE DE90200107T patent/DE59002869D1/de not_active Expired - Fee Related

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0573750A3 (fr) *	1992-06-10	1994-03-09	Whirlpool Europ
US5352873A (en) *	1992-06-10	1994-10-04	Whirlpool Europe B.V.	Microwave oven cavity including a grill element
WO1997023756A1 (fr) *	1995-12-22	1997-07-03	Daewoo Electronics Co., Ltd.	Four a micro-ondes possedant un dispositif de chauffage
WO1998034436A1 (fr) *	1997-01-30	1998-08-06	Whirlpool Corporation	Element de gril
US6153866A (en) *	1997-01-30	2000-11-28	Whirlpool Corporation	Microwave oven with a grilling device

Also Published As

Publication number	Publication date
EP0380158B1 (fr)	1993-09-29
EP0380158A3 (fr)	1991-12-27
DE59002869D1 (de)	1993-11-04
DE3901676A1 (de)	1990-07-26

Publication	Publication Date	Title
DE2721802C2 (de)	1982-06-09	Vorrichtung zur Temperaturüberwachung in einem Mikrowellenherd
DE2622173C3 (de)	1986-02-13	Vorrichtung zum Erhitzen eines in eine Heizkammer eingebrachten Gegenstandes
EP3338515B1 (fr)	2020-04-08	Sonde de température à coeur, dispositif de cuisson à microondes et système
DE69533647T2 (de)	2006-02-23	Vorrichtung und verfahren zur mikrowellenbearbeitung von materialien
EP0657733A2 (fr)	1995-06-14	Méthode et appareil pour mesurer la constante diélectrique d'échantillons
DE2657499A1 (de)	1977-06-30	Temperaturfuehlsonde fuer mikrowellenherde
DE102020104743A1 (de)	2021-08-26	Lastsensor-Baugruppe, Kerntemperaturfühler, Gargerät und Verfahren zur Ermittlung einer dielektrischen Last im Garraum eines Gargeräts
DE69511663T2 (de)	2000-03-02	Induktionskochgerät mit reduzierter Störstrahlung
EP0380158B1 (fr)	1993-09-29	Enceinte à micro-ondes
DE19853780A1 (de)	2000-01-05	Garofen mit induktiv beheiztem Heizkörper und Verfahren zum Beheizen einer Ofenmuffel eines Garofens
DE2507175A1 (de)	1975-08-28	Temperaturueberwachungsvorrichtung fuer mikrowellenherde
EP1063678A2 (fr)	2000-12-27	Dispositif de production d'un plasma excité par microondes dans une cavité
CH629054A5 (de)	1982-03-31	Hochfrequenzheizgeraet.
DE10122337A1 (de)	2002-12-12	Wasserkocher aus Glas mit induktiver Heizung
EP0420319B1 (fr)	1993-09-29	Cuisinière électrique
DE2229743A1 (de)	1973-02-15	Magnetronfilterkasten
DE69119986T2 (de)	1996-11-14	Hochfrequenzheizgerät und elektromagnetischer Wellendetektor zum Gebrauch im Hochfrequenzheizgerät
DE102015109685B4 (de)	2024-05-23	Gargerät mit einer Mikrowellenquelle sowie Antenne für ein Gargerät
DE60128210T2 (de)	2008-01-10	Temperaturmessgerät und zugehörige verbesserungen
EP3997961B1 (fr)	2023-07-05	Four à micro-ondes domestique avec dispositif de variation de mode
EP3425356A1 (fr)	2019-01-09	Sonde de mesure
DE2834335C2 (de)	1986-03-27	Mikrowellenofen mit einem innerhalb der Heizkammer angeordneten Strahlungsheizkörper
DE60305701T2 (de)	2007-05-31	Kondensator für das Magnetron eines Mikrowellenofens
DE102016206342A1 (de)	2017-10-19	Gargerät mit einer Flächenantenne und Verfahren zum Betreiben eines Gargeräts
DE7833977U1 (de)	1980-06-12	Herd oder ofen fuer verbundbetrieb mit mikrowellenenergie und widerstandsheizung

Legal Events

Date	Code	Title	Description
1990-06-16	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
1990-08-01	AK	Designated contracting states	Kind code of ref document: A2 Designated state(s): DE FR GB IT SE
1991-11-07	PUAL	Search report despatched	Free format text: ORIGINAL CODE: 0009013
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1992-06-24	17P	Request for examination filed	Effective date: 19920416
1993-02-03	17Q	First examination report despatched	Effective date: 19921221
1993-02-17	RAP1	Party data changed (applicant data changed or rights of an application transferred)	Owner name: WHIRLPOOL EUROPE B.V. Owner name: BAUKNECHT HAUSGERAETE GMBH
1993-08-12	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
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1994-02-04	ET	Fr: translation filed
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