EP0482601B1 - Alimentation de micro-ondes dans des fours à micro-ondes - Google Patents
Alimentation de micro-ondes dans des fours à micro-ondes Download PDFInfo
- Publication number
- EP0482601B1 EP0482601B1 EP91118056A EP91118056A EP0482601B1 EP 0482601 B1 EP0482601 B1 EP 0482601B1 EP 91118056 A EP91118056 A EP 91118056A EP 91118056 A EP91118056 A EP 91118056A EP 0482601 B1 EP0482601 B1 EP 0482601B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- microwave
- household appliance
- appliance according
- reflector trough
- waveguide
- 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.)
- Expired - Lifetime
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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
- H05B6/74—Mode transformers or mode stirrers
Definitions
- the patent application relates to a microwave household appliance, in particular to a radiator unit for a microwave oven, with the features specified in the preamble of claim 1 (see DE-C-37 20 719).
- a microwave oven with a rotating antenna has become known, the antenna arm of which is a segment of a circular area with an opening angle that is between 1/3 Pi and Pi.
- the circular surface segment has projections on the lateral boundaries, the width of which is approximately 1/6 of the wavelength of the microwaves.
- DE-33 26 514 has proposed a microwave oven with a rotating antenna, the antenna arm of which is asymmetrical. This is intended to solve the problem of improving the uniformity of the microwave radiation and achieving a uniform heating of the food in the cooking space.
- a further improvement of microwave ovens equipped with rotary antennas has become known from DE 37 20 719.
- microwave-specific discontinuities are arranged.
- the invention is therefore based on the object of using a special radiator unit to bring about a further improvement in the energy density distribution in the cooking space and thus to improve the cooking results by means of more uniform energy distributions.
- the arrangement according to the invention for solving this problem is characterized in that a reflector trough arranged outside the oven top surface is connected to the waveguide and the cooking space top surface, and that the microwave coupling pin protruding into the reflector trough and connected to the field stirrer is connected at a passage point between the waveguide and the reflector trough is surrounded by at least two microwave-specific discontinuities, which are formed by screw connections and material thickening, that the field stirrer is a spiral, the total length of which is much greater than its thickness, and that the cover limits the reflector trough on the cooking space side.
- An advantageous embodiment of the invention consists in that the microwave-specific discontinuities ⁇ / 8 are long screw connections which mechanically connect the waveguide to the reflector trough at the same time. Such discontinuities represent blind elements from a microwave point of view and model the current density coating on the antenna arm, with the same effect on a field stirrer element.
- the rotary antenna or the field stirrer detects microwave-specific discontinuities as often as possible and thus part of the current density coating on the respective surface of the antenna or the field stirrer is constantly acted on by additional blind elements.
- the geometric design of the antenna arm configuration or the field stirrer also causes different current density coatings, which also result in a more even energy distribution in the cooking space.
- the field stirrer spiral 8 which is set in rotation by the stirrer drive 1, is firmly connected to the microwave decoupling pin 5, within the reflector trough 7
- Reflector trough 7 is arranged outside the oven top surface and is connected to the waveguide 4 and the oven top surface 10 via screw connections.
- the overall structural arrangement of waveguide 4 and the system of the field stirrer is thus centered on the waveguide leadthrough in the middle of the cooking space.
- the waveguide screw connections 6 represent microwave-specific discontinuities of the length ⁇ / 8 of the microwaves. However, it is also conceivable that the microwave-specific discontinuities are designed as ⁇ / 8 long weld thickenings.
- the reflector trough 7 will preferably have a circular cross section with a radius of approximately ⁇ / 2 of the microwave wavelength. A rectangular design of the reflector trough 7 is also possible.
- the waveguide through opening 11 from the waveguide 4 to the reflector trough 7 has at least a diameter of ⁇ / 4 of the microwave wavelength.
- the reflector trough 7 is provided with a cover 9 which consists of materials which are permeable to microwaves and have low dielectric losses.
- the material borosilicate glass is preferably used for the cover 9, but plastics with low E r can also be used.
- the field stirrer is designed as a stirrer spiral 8, the top view of which can be seen in FIG. 2.
- this embodiment results in a good energy density distribution in the cooking space.
- the total length of the stirrer spiral is much larger than the thickness.
- materials are preferably used that are very corrosion-resistant and have good long-term constancy of electrical properties, for example chrome-nickel alloys.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Constitution Of High-Frequency Heating (AREA)
Claims (10)
- Appareil ménager à micro-ondes, dont l'énergie HF, produite par un magnétron, est envoyée par l'intermédiaire d'un guide d'ondes (4) à une unité formant émetteur de rayonnement, qui est constituée par une tige (5) de découplage des micro-ondes et par un dispositif (8) d'agitation du champ et possède un capot réalisé en un matériau présentant de faibles pertes diélectriques, caractérisé en ce
qu'une cavité formant réflecteur (7), disposée à l'extérieur d'une surface (10) de fermeture de l'espace de cuisson, est reliée au guide d'ondes (4) et à la surface (10) de fermeture de l'espace de cuisson,
que la tige (5) de découplage des micro-ondes, qui pénètre dans la cavité formant réflecteur (7) et est reliée au dispositif (8) d'agitation du champ, est entourée, au niveau d'un point de traversée (11) entre le guide d'ondes (4) et la cavité formant réflecteur, par au moins deux discontinuités (6) spécifique pour les micro-ondes et qui sont formées par des dispositifs de vissage et des épaississements de matière,
que le dispositif d'agitation du champ est une spirale, dont la longueur totale (L) est nettement supérieure à son épaisseur, et
que le capot (9) limite, du côté de l'espace de cuisson, la cavité formant réflecteur (7). - Appareil ménager à micro-ondes selon les revendications 1 et 2, caractérisé en ce que le matériau du dispositif d'agitation du champ est de préférence un alliage chrome-nickel.
- Appareil ménager à micro-ondes selon les revendications 1, caractérisé en ce que les discontinuités (6), qui sont spécifiques aux micro-ondes, sont des systèmes de fixage, qui possèdent une longueur égale à 1/8 de la longueur d'onde λ des micro-ondes et qui simultanément relient mécaniquement le guide d'ondes (4) à la cavité formant réflecteur (7).
- Appareil ménager à micro-ondes selon la revendication 1, caractérisé en ce que les discontinuités (6), spécifiques aux micro-ondes, sont constituées par un épaississement en forme de cordon de soudure conformé, possédant une longueur égale à 1/8 de la longueur λ des micro-ondes et qui simultanément relient mécaniquement le guide d'ondes (4) à la cavité formant réflecteur (7).
- Appareil ménager à micro-ondes selon la revendication 1, caractérisé en ce que la cavité formant réflecteur (16) possède une section transversale circulaire, possédant un rayon égal à environ 1/2 de la longueur d'onde λ des micro-ondes.
- Appareil ménager à micro-ondes selon les revendications 1, 7, caractérisé en ce que la cavité formant réflecteur (7) possède une section transversale rectangulaire.
- Appareil ménager à micro-ondes selon la revendication 1, caractérisé en ce que l'ouverture (11) de traversée du guide d'ondes, qui débouche dans la cavité formant réflecteur (7), possède au moins un diamètre égal à 1/4.
- Appareil ménager à micro-ondes selon la revendication 1, caractérisé en ce que le capot (9) est aligné avec la surface (10) de fermeture du four de cuisson et est réalisé en verre, de préférence en verre au borosilicate.
- Appareil ménager à micro-ondes selon les revendications 1, 9, caractérisé en ce que le capot est réalisé en matière plastique.
- Appareil ménager à micro-ondes selon les revendications 1, 9, caractérisé en ce que le capot (9) est réalisé en mica.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4034161 | 1990-10-26 | ||
DE4034161A DE4034161A1 (de) | 1990-10-26 | 1990-10-26 | Mikrowelleneinspeisung in mikrowellen-backoefen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0482601A1 EP0482601A1 (fr) | 1992-04-29 |
EP0482601B1 true EP0482601B1 (fr) | 1995-06-14 |
Family
ID=6417144
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91118056A Expired - Lifetime EP0482601B1 (fr) | 1990-10-26 | 1991-10-23 | Alimentation de micro-ondes dans des fours à micro-ondes |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0482601B1 (fr) |
JP (1) | JPH04264387A (fr) |
DE (3) | DE4034161A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101448348B (zh) * | 2008-11-27 | 2011-06-15 | 电子科技大学 | 一种螺旋喇叭状微波馈能天线及其阵列微波加热装置 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2520133B1 (fr) | 2009-12-30 | 2016-06-29 | Arçelik Anonim Sirketi | Four |
EP2950616B1 (fr) * | 2014-05-26 | 2018-11-07 | Electrolux Appliances Aktiebolag | Four à micro-ondes avec un guide d'onde incluant un élément réflecteur |
CN104791858A (zh) * | 2015-03-23 | 2015-07-22 | 广东美的厨房电器制造有限公司 | 微波炉 |
CN105357790B (zh) * | 2015-12-21 | 2018-01-12 | 电子科技大学 | 一种采用圆极化螺旋天线作辐射器的双管微波炉 |
CN105509108B (zh) * | 2015-12-21 | 2018-01-12 | 电子科技大学 | 一种采用圆筒形炉腔及以螺旋天线作辐射器的微波炉 |
CN105392227B (zh) * | 2015-12-21 | 2017-12-15 | 电子科技大学 | 一种采用圆极化螺旋天线作为辐射器的微波炉 |
CN110191530B (zh) * | 2019-05-28 | 2021-10-29 | 中国电子科技集团公司第十二研究所 | 一种微波辐射加热装置 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3493709A (en) * | 1968-10-25 | 1970-02-03 | Gen Electric | Spiral antenna for electronic oven |
US3939320A (en) * | 1974-04-12 | 1976-02-17 | Micro-Tronics, Inc. | Beam stirrer |
US4335289A (en) * | 1978-12-21 | 1982-06-15 | Amana Refrigeration, Inc. | Microwave oven |
JPS5665487A (en) * | 1979-10-30 | 1981-06-03 | Matsushita Electric Ind Co Ltd | High frequency heating device |
US4316069A (en) * | 1979-12-03 | 1982-02-16 | General Electric Company | Microwave oven excitation system |
DE3029035C2 (de) * | 1980-07-31 | 1982-11-11 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Mikrowellenheizgerät |
DE3142633A1 (de) * | 1981-10-28 | 1983-05-11 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Kombinierter herd fuer mikrowellen- und elektrischen heizwiderstands-betrieb |
AU559648B2 (en) * | 1982-03-11 | 1987-03-19 | Matsushita Electric Industrial Co., Ltd. | Microwave oven with rotary antenna |
JPS5920992A (ja) * | 1982-07-23 | 1984-02-02 | 松下電器産業株式会社 | 高周波加熱装置 |
DE3331432A1 (de) * | 1982-08-31 | 1984-03-29 | Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart | Hochfrequenzheizgeraet |
JPS60130094A (ja) * | 1983-12-15 | 1985-07-11 | 松下電器産業株式会社 | 高周波加熱装置 |
JPS62158790U (fr) * | 1986-03-29 | 1987-10-08 | ||
DE3720719C1 (en) * | 1987-06-23 | 1989-01-12 | Bosch Siemens Hausgeraete | Microwave oven which has a more evenly distributed energy in the cooking space |
-
1990
- 1990-10-26 DE DE4034161A patent/DE4034161A1/de not_active Ceased
- 1990-10-26 DE DE9017953U patent/DE9017953U1/de not_active Expired - Lifetime
-
1991
- 1991-10-23 DE DE59105703T patent/DE59105703D1/de not_active Expired - Fee Related
- 1991-10-23 EP EP91118056A patent/EP0482601B1/fr not_active Expired - Lifetime
- 1991-10-25 JP JP3278208A patent/JPH04264387A/ja active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101448348B (zh) * | 2008-11-27 | 2011-06-15 | 电子科技大学 | 一种螺旋喇叭状微波馈能天线及其阵列微波加热装置 |
Also Published As
Publication number | Publication date |
---|---|
DE59105703D1 (de) | 1995-07-20 |
DE4034161A1 (de) | 1992-04-30 |
DE9017953U1 (fr) | 1993-01-28 |
EP0482601A1 (fr) | 1992-04-29 |
JPH04264387A (ja) | 1992-09-21 |
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