EP0121892B1 - Four combiné à convection et à micro-ondes - Google Patents

Four combiné à convection et à micro-ondes Download PDF

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Publication number
EP0121892B1
EP0121892B1 EP84103652A EP84103652A EP0121892B1 EP 0121892 B1 EP0121892 B1 EP 0121892B1 EP 84103652 A EP84103652 A EP 84103652A EP 84103652 A EP84103652 A EP 84103652A EP 0121892 B1 EP0121892 B1 EP 0121892B1
Authority
EP
European Patent Office
Prior art keywords
oven
fan
oven cavity
microwave
microwaves
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
Application number
EP84103652A
Other languages
German (de)
English (en)
Other versions
EP0121892A2 (fr
EP0121892A3 (en
Inventor
Ruggero Roccari
Arturo Negretti
Walter Zanzani
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.)
Industrie Zanussi SpA
Original Assignee
Industrie Zanussi SpA
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 Industrie Zanussi SpA filed Critical Industrie Zanussi SpA
Priority to AT84103652T priority Critical patent/ATE32485T1/de
Publication of EP0121892A2 publication Critical patent/EP0121892A2/fr
Publication of EP0121892A3 publication Critical patent/EP0121892A3/en
Application granted granted Critical
Publication of EP0121892B1 publication Critical patent/EP0121892B1/fr
Expired legal-status Critical Current

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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
    • H05B6/72—Radiators or antennas
    • H05B6/725—Rotatable antennas
    • 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
    • H05B6/6473—Aspects related to microwave heating combined with other heating techniques combined with convection heating

Definitions

  • the present invention relates to a combination oven, particularly for domestic use, in which the heating and cooking of foods is carried out with the aid of conventional gas or electric heating means or by means of microwaves.
  • the oven is provided with a motor-driven fan effective to agitate the air within the oven cavity during operation of the oven.
  • Combination convection and microwave ovens present the problem of suitably positioning the elements for microwave generation and diffusion so as to ensure proper operation of the oven in both of its operating modes.
  • the microwave generator is disposed outside and on top of the oven cavity, and the microwaves are radiated into the oven cavity through the top wall thereof (FR-A-21 04 482).
  • the conventional heating elements have to be of a particular configuration and require special shielding, while the components of the microwave system require extensive provisions for ventilation and insulation. This leads to increased difficulties and costs in designing and manufacturing an oven of this type while reducing the efficiency thereof in the conventional cooking mode, as the increased ventilation carries away a substantial portion of the generated heat.
  • the microwave generator is located below the oven cavity, while the microwaves are radiated into the oven cavity through the top wall thereof.
  • the temperature problems are somewhat mitigated, but the efficiency is reduced in the microwave cooking mode due to increased losses resulting from the increased length of the waveguide conduit and the low quality thereof.
  • the microwave generator is located below the oven cavity and the microwaves are radiated thereinto through the bottom wall thereof, the foods to be cooked are partially shielded from the microwaves by the vessels containing them (EP-A-23 827).
  • the vessels containing them EP-A-23 827.
  • a combination convection and microwave oven comprising: an oven cavity having disposed therein conventional heater elements and a fan driven by an electric motor located outside said cavity, and a microwave generator disposed in a rear portion of said oven below said oven cavity and connected thereto through a waveguide conduit.
  • an oven of this type is characterized in that the end portion of the shaft of said motor driving said fan projects into the oven cavity and forms a rotating antenna for radiating microwaves, said shaft being mounted in a support of an insulating material permeable to microwaves and extending through said waveguide conduit disposed at the rear of the rear wall of the oven cavity.
  • the oven according to the invention comprises a housing 19 enclosing an oven cavity 17 surrounded by an insulating jacket 7 and provided with a door 18.
  • Door 18 is of the conventional double glass window type including seals for preventing the escape of microwaves and provided with a handle 16.
  • An opening of handle 16 communicates with an open space 15 between the door and the forward edge of the oven cavity, and with a conduit 8 disposed above the oven cavity and connected to a fan 19.
  • Located above the oven cavity 17 is a control panel 20. The air aspirated by fan 9 is thus effective to cool control panel 20 and handle 16 and ensures the extraction of the humidity resulting from the cooking of foods within oven cavity 17.
  • the lower portion of housing 19 is formed with a seat for mounting a microwave generator 3 and a transformer 4 associated therewith adjacent a rear portion of the oven.
  • a blower fan 2 accommodated by the same seat aspirates air through a front opening 1 and expells it at the back of the oven, thereby cooling the microwave generator and other components located at the rear portion of the oven as will be described.
  • the microwaves generated by generator 3 are conducted along a waveguide conduit 5 secured to the rear wall of oven cavity 17 and extending over a limited length to about half the height of the oven cavity.
  • a fan 11 Interiorly of oven cavity 17 and about at the center of its rear wall there is mounted a fan 11 the metal shaft 12 of which extends through waveguide 5 to be driven by an electric motor 6 supported by the rear wall of the oven.
  • a support 12 of an insulating material permeable to microwaves surrounds shaft 12 over a part of its length within waveguide conduit 5 so as to avoid any radiation losses.
  • fan 11 Within oven cavity 17 fan 11 is surrounded by conventional heater elements 10, for instance electric resistance heater elements, while an electric resistance grill rod 14 is mounted in the upper portion of cavity 17.
  • a panel 13 Fixedly secured in front of fan 11 and heater elements 10 is a panel 13 made of heat resistant material permeable to microwaves, for instance of a vitreous ceramic material, provided with central openings permitting air to be circulated within oven cavity 17 by the action of fan 11, such air being aspirated through said central openings and expelled in radial directions from behind panel 13.
  • the panel 13 is preferably detachable for facilitating cleaning and maintenance operations.
  • Motor 6 of fan 11 is adapted to operate at two different speeds, while the shaft 12 of fan 11 projects into the oven cavity for a length corresponding to one quarter of the wavelength of the microwave radiation generated by generator 3.
  • fan 11 As fan 11 is driven at low speed, its shaft 12 functions as a microwave radiating antenna, while fan 11 is effective to evenly distribute the radiation throughout oven cavity 17. In the conventional cooking mode, fan 11 is driven at higher speed, so that the oven functions as a convection oven.
  • the present invention thus effectively provides a structural and functional integration of the conventional cooking system with the microwave cooking system with optimum technical and economical results.
  • the described construction may of course be modified in various manners without leaving the scope of the present invention.
  • the fan 2 for cooling the microwave generating components may thus be mounted at a different location as dictated by the space available within housing 19. Further the electric resistance grill rod 14 may be fixedly or detachably mounted within the oven cavity 17.
  • the microwave generator in the lower rear portion of housing 19, and the emission of the microwaves into the oven cavity 17 through the rear wall thereof, the fan 11 used for circulating the air within oven cavity 17 and the end portion of fan shaft 12 forming the means for radiating the microwaves into the oven cavity.

Claims (3)

1. Four combiné à convection et micro-ondes, comprenant: une cavité de four (17) à l'intérieur de laquelle sont disposés des éléments chauffants conventionnels (14) et un ventilateur (11) entraîné par un moteur électrique (6) disposé à l'extérieur de la cavité (17), et un générateur de micro-ondes (3) disposé dans une portion arrière du four en-dessous de la cavité du four (17) et raccordé à αeIIe- ci par un conduit de guide d'ondes (5), caractérisé en ce que la portion terminale de l'arbre (12) du moteur (6) entraînant le ventilateur (11) se projette dans la cavité du four (17) et forme une antenne rotative pour le rayonnement des micro-ondes, cet arbre (12) étant monté dans un support (21) en un matériau isolant perméable aux micro-ondes et s'étendant à travers le conduit de guide d'ondes (5) disposé sur l'arrière de la paroi postérieure de la cavité du four (17).
2. Four combiné selon la revendication 1, caractérisé en ce que le moteur (6) est adapté pour fonctionner à deux vitesses différentes et en ce que l'arbre (12) du ventilateur (11) s'étend dans l'intérieur de la cavité de four (17) de façon à fonc- tionnner en tant qu'antenne rotative pour la diffusion des micro-ondes.
3. Four combiné selon la revendication 1, caractérisé en ce que le ventilateur (11) est entouré par un élément chauffant conventionnel (10), par exemple un élément chauffant à résistance électrique, le ventilateur (11) et cet élément chauffant (10) étant protégés par un panneau (13) en un matériau résistant à la chaleur, perméable aux micro-ondes et pourvu d'ouvertures centrales.
EP84103652A 1983-04-07 1984-04-03 Four combiné à convection et à micro-ondes Expired EP0121892B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84103652T ATE32485T1 (de) 1983-04-07 1984-04-03 Kombinierter konvektions- und mikrowellenofen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT45712/83A IT1174946B (it) 1983-04-07 1983-04-07 Forno combinato a convezione e a microonde
IT4571283 1983-04-07

Publications (3)

Publication Number Publication Date
EP0121892A2 EP0121892A2 (fr) 1984-10-17
EP0121892A3 EP0121892A3 (en) 1985-05-15
EP0121892B1 true EP0121892B1 (fr) 1988-02-10

Family

ID=11257530

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84103652A Expired EP0121892B1 (fr) 1983-04-07 1984-04-03 Four combiné à convection et à micro-ondes

Country Status (5)

Country Link
EP (1) EP0121892B1 (fr)
AT (1) ATE32485T1 (fr)
DE (1) DE3469337D1 (fr)
ES (1) ES8503425A1 (fr)
IT (1) IT1174946B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174876B (en) * 1985-03-14 1988-04-20 Toshiba Kk Microwave oven
FR2618529B1 (fr) * 1987-07-24 1989-12-29 Dietrich & Cie De Circuit de ventilation supplementaire pour four electro-domestique combine
FR2637053B1 (fr) * 1988-09-29 1990-11-16 Scholtes Ets Eugen Four de cuisson mixte
US5756974A (en) * 1995-06-09 1998-05-26 Samsung Electronics Co., Ltd. Convection microwave oven having improved hot air circulation
KR100402497B1 (ko) * 2000-11-30 2003-10-22 주식회사 엘지이아이 전자레인지의 가열장치
KR100988570B1 (ko) * 2003-04-10 2010-10-19 삼성전자주식회사 가열조리기
DE102012004080A1 (de) * 2012-02-28 2013-08-29 Holger Behrendt Plasma - Heisluftgerät zum Energie sparenden Betreiben eines Heisluftofens

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1249130A (fr) * 1959-02-25 1960-12-23 Miwag Mikrowellen Ag Cuisinière électrique avec dispositif complémentaire à micro-ondes
SE368269B (fr) * 1970-08-18 1974-06-24 Hirst Microwave Ind Ltd
DE2834335C2 (de) * 1978-08-04 1986-03-27 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Mikrowellenofen mit einem innerhalb der Heizkammer angeordneten Strahlungsheizkörper
US4337384A (en) * 1979-08-01 1982-06-29 Matsushita Electric Industrial Co., Ltd. Cooking appliance of the hot air circulating type
US4316069A (en) * 1979-12-03 1982-02-16 General Electric Company Microwave oven excitation system

Also Published As

Publication number Publication date
ATE32485T1 (de) 1988-02-15
IT8345712A1 (it) 1984-10-07
EP0121892A2 (fr) 1984-10-17
ES530610A0 (es) 1985-02-16
ES8503425A1 (es) 1985-02-16
IT1174946B (it) 1987-07-01
DE3469337D1 (en) 1988-03-17
EP0121892A3 (en) 1985-05-15
IT8345712A0 (it) 1983-04-07

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