WO1990008449A1 - Four a micro-ondes, aux infrarouges et a convection combine - Google Patents

Four a micro-ondes, aux infrarouges et a convection combine Download PDF

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Publication number
WO1990008449A1
WO1990008449A1 PCT/CH1990/000007 CH9000007W WO9008449A1 WO 1990008449 A1 WO1990008449 A1 WO 1990008449A1 CH 9000007 W CH9000007 W CH 9000007W WO 9008449 A1 WO9008449 A1 WO 9008449A1
Authority
WO
WIPO (PCT)
Prior art keywords
infrared
food
air
oven
microwave
Prior art date
Application number
PCT/CH1990/000007
Other languages
German (de)
English (en)
Inventor
Wolfgang Frech
Original Assignee
Wolfgang Frech
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 Wolfgang Frech filed Critical Wolfgang Frech
Publication of WO1990008449A1 publication Critical patent/WO1990008449A1/fr

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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
    • H05B6/647—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
    • H05B6/6485—Aspects related to microwave heating combined with other heating techniques combined with radiant heating, e.g. infrared heating further combined with convection heating
    • 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

Definitions

  • the present invention relates to a combined microwave, infrared and convection oven according to the preamble of claim 1.
  • Microwave ovens for kitchen use are widespread because they can save a lot of energy and time when heating and cooking food compared to conventional ovens or hot plates.
  • the pure microwave oven has the disadvantage that practically no frying or baking effect can be achieved with them and thus no crusts can be achieved in the case of foods which have not previously been fried in a conventional manner in the oven or pan.
  • crusts prepared in this way often become mushy in the microwave oven instead of crawling. This has led to the fact that most manufacturers of microwave ovens have started to install an infrared heating source in the devices in addition to the microwave source, which either through direct radiant heat or via the detour of hot air, in addition to the pure heating of the food by the microwaves, also a roast and Allow baking of the same.
  • infrared heating sources In the case of the use of pure radiant heat, electrical resistance elements in the form of heating coils are generally used as infrared heating sources. Since such infrared heating elements, however, require a heating phase and therefore only relatively low temperatures can be reached on the food surfaces in the short cooking time typical of the microwave oven, frying or baking of foods in the microwave oven often requires a preparation time that goes beyond the pure heating time by means of the microwaves, such that a baking and roasting phase must be connected upstream or downstream of the cooking of the food, during which the microwave source is not or with reduced power is in operation.
  • the present invention has for its object to provide a combined microwave, infrared and convection oven, which overcomes the disadvantages of the conventional microwave oven and which is also suitable for the preparation of potato dishes, pizzas, as well as grilled and fried dishes, etc. , resp. even with such problematic dishes "within a short preparation time of the order of a few minutes, gives good results.
  • FIG. 1 shows a schematic cross section through a first advantageous embodiment variant of a furnace according to the invention, without showing the component irrelevant to the invention
  • FIG. 2 shows a section through a conventional microwave oven in which the components relevant to the invention are inserted in the form of an insert
  • Fig. 3 is a front view of the insert according to Fig. 2, and
  • Fig. 4 is a schematic side view of a second advantageous embodiment of an oven according to the invention, without showing the components irrelevant to the invention.
  • FIG. 1 shows a simplified and schematic cross section of a first embodiment variant of a combined microwave, infrared and convection oven according to the invention.
  • a housing 1 and an advantageously transparent door 2 can be seen, so that a view of the food to be cooked is possible at any time.
  • the components required in a microwave oven such as the power supply unit, microwave transmitter, fan and timer, and security elements etc. are accommodated.
  • the furnace chamber 4 in the oven according to the invention is not separated from the rear part 3 by a continuous straight rear wall, but rather by a rear wall which is angled with respect to the depth of the device in such a way that two staggered wall parts 5 and 6 are formed serve as air guiding elements, the function of which is described below.
  • a advantageously arranged inclined grate 7, which can be connected to the door 2 or otherwise positioned using known means.
  • a second infrared heating element 9 of this type is arranged in the rear lower part of the oven space 4, advantageously in the area where the upper wall part 5 ends in front of the lower wall part 6.
  • An intermediate wall 10 is advantageously arranged above the rear part 3 of the furnace in such a way that an air duct 11 is formed, which is connected to the surroundings of the device via an air outlet opening 12, for example in the form of slots arranged next to one another in the housing 1.
  • the rear device part 3 is, as is customary in the case of a microwave oven, provided with an air inlet opening 13, for example likewise in the form of slots in the housing 1 arranged next to one another, through which a fan, not shown, sucks in cooling air for cooling the microwave transmitter, also not shown, as is shown in FIG Arrows is indicated. This air sucked into the interior of the device is guided to flow around the device components to be cooled and blown into the furnace chamber 4 via the passage 14 delimited by the two wall parts 5 and 6.
  • the infrared heating element 9 which advantageously extends over the entire length of the furnace space 4, and is strongly heated. It then flows past the items to be cooked, not shown here, located on the grate 7 and removes the moisture escaping from them in such a way that the formation of a steam shield around the items to be cooked, caused by the microwaves penetrating them, is prevented.
  • a support 15, which is advantageously part of the grill 7, ensures that the food, respectively. that this receiving dishes, not supported against the door 2 and thus can prevent the air flow from flowing around the food.
  • the hot and humid air exits the air duct 11 and the air outlet opening 12 from the combined microwave, infrared and convection oven according to the invention, as is also indicated by arrows.
  • the described arrangement of the air guiding elements in the form of the wall parts 5 and 6 and the intermediate wall 10, but also the infrared heating elements 8 and 9 and the grate 7 with the support 15 and the specifically coordinated functions of these elements have the effect that, as usual, of microwaves Diameter of the cooked food is simultaneously heated by the microwaves, ie cooked and baked and fried by the intense infrared rays that start practically instantaneously with full power when switched on.
  • the hot air stream flowing around the food to be cooked ensures that the infrared rays can act unhindered on the surfaces of the food to be cooked during the entire cooking time by continuously removing the steam shield that usually envelops the food to be cooked in the hot air. This prevents the food from being mushy due to excessive moisture on its surface, instead of being fried.
  • the optimal interaction of microwaves, infrared rays and hot air flow realized for the first time thanks to the invention enables foodstuffs such as potato dishes, breaded fish or breaded fish or breaded meat, pizzas, etc. with good, even unsuitable for preparation in microwave or combined microwave, infrared and convection ovens Prepare success in a microwave oven-typical short time with low energy consumption. It is generally no longer necessary to pre-fry the food for a long time using the conventional resistance heating elements or to subsequently grill after the microwave heating before switching on the microwave source.
  • the air guiding and infrared heating elements are not installed directly in the microwave oven as described above, but rather are housed in an insert which advantageously consists of ceramic elements and can be used essentially in an empty oven space designed as usual.
  • Fig. 2 illustrates schematically and in section a correspondingly equipped microwave oven.
  • the insert which is advantageously formed from ceramic plates 16 and inserted into the furnace chamber 4, the rear wall of which is specially designed to achieve optimal air flow and advantageously comprises mutually offset parts 5 'and 6' which partially overlap and a passage 14 for the air form. This results in a slightly smaller cooking chamber 4a than the oven chamber 4.
  • An intermediate wall 10 ′ adjoins the rear wall part 5 ′′, which merges into the rear ceramic plate 16 of the insert, which in turn delimits an air duct 11 ′ with a metal air duct boundary wall 10a.
  • the latter is connected to the appliance part 3 of the furnace via an opening 13a in such a way that a part of the cooling air drawn in through the air inlet opening 13 emerges from the device after flowing around the device components via this air duct 11 'and the air outlet opening 12.
  • the remaining part of the cooling air drawn into the furnace flows, similarly to the combination of the invention according to the invention 1, via a passageway 14a and the passageway 14 past the lower infrared heating element 9 as hot air into the cooking chamber 4a.
  • the hot air leaves the cooking chamber 4a via the air duct 11.
  • the infrared heating elements 8 and 9 which advantageously extend over the entire width of the insert, open out on both sides of the insert, advantageously in sockets 21.
  • the inclined grate 7, free-standing or by any type of suitable supporting elements positioned, is advantageously arranged removably in use.
  • Such an application is particularly useful and valuable if commercially available microwave ovens are to be converted into advantageous combined microwave, infrared and convection ovens according to the invention, which generally involves minimal effort, which essentially consists of the electrical connection of the infrared heating elements via a separate switch , can happen.
  • the use described also allows conventional new microwave ovens to be equipped with the parts relevant to the invention, which, due to the high number of such ovens, can be economically more interesting than the production of smaller series of combined microwave, infrared and convection ovens according to the invention.
  • Fig. 4 illustrates a second, advantageous embodiment of a combined microwave, infrared and convection oven according to the invention, in which the food can be arranged horizontally in the cooking space without risk of contamination of the infrared radiators.
  • This embodiment of the invention also has a housing 1 with an advantageously transparent door 2 and a rear part 3 which accommodates the various units such as power supply unit, magnetron, etc.
  • the oven or cooking chamber 4 is from this rear part 3 and generally from the housing 1 by an advantageously made of metallic material
  • This air flow heats up considerably at the infrared radiators 28 in such a way that it can absorb and remove the moisture escaping from the cooking or cooking product 31 around it.
  • the air flow then leaves the furnace chamber 4, for example through openings 32, and is led out of the housing 1, optionally mixed with the device cooling air, as described above.
  • the grate 33 receiving the food 31 can be arranged horizontally in this embodiment of a combined microwave, infrared and convection oven according to the invention become.
  • glass ceramic plates 24 and 26 as a cover for the infrared radiator 28 offers the possibility of shielding the latter from the negative effects of the microwaves by means of metal castings 34 and 35 which can be integrated in the glass ceramic plates 24 and 26 and which are indicated by dashed lines, in such a way that they are protected Service life significantly increased.
  • metal castings 34 and 35 which can be integrated in the glass ceramic plates 24 and 26 and which are indicated by dashed lines, in such a way that they are protected Service life significantly increased.
  • an outer jacket 23 made of ceramic material, for example of glass ceramic plates can also be provided, into which metal grids should also be inserted for the purpose of shielding the infrared radiators 28 from the microwaves.
  • Infrared radiators 28 are to be provided in the metal outer jacket 23 and / or in the metal grids or at least some of them, microwave passage channels 36, two of which are indicated in the drawing by dashed lines and through which the microwaves can enter the furnace chamber 4 unhindered.
  • This embodiment variant of a combined microwave, infrared and convection oven according to the invention is advantageous over the embodiment variant according to FIG. 1 and the insert according to FIGS. 2 and 3 in particular in all those oven applications where it is necessary to heat the food in a horizontal position and / or to cook and / or to cook. It is advantageously designed as a fully integrated kitchen appliance, but can also be used in existing microwave ovens if required.
  • the air flow can also be guided differently than described above, provided that it cooks the food around it or at least above and flows around under the grate 7 in a continuous flow principle and the air flowing into the furnace space is heated up.
  • halogen lights as infrared heating elements
  • other intensive infrared radiators can be used, provided they have extremely short heating times and wavelengths suitable for baking and roasting food. Quartz radiators, for example, are considered as such heating elements.
  • it can be provided in the combined microwave, infrared and convection oven according to the invention or in a conventional microwave oven which is equipped with an insert according to the invention that the infrared heating elements and the microwave transmitter are operated and switched independently of one another or together.
  • a circuit limits the total electrical power that can be absorbed by the furnace to, for example, 2000 watts, which can be used when the magnetron and / or fan is switched off for increased heating of the heating elements for the purpose of catalytically cleaning the Oven chamber and in particular the glass ceramic plates 24 to 26 in the embodiment variant according to FIG. 4.
  • Other modifications to the individual elements of the invention which are not familiar to the person skilled in the art and are not described above, are also conceivable and realizable.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Stoves And Ranges (AREA)
  • Baking, Grill, Roasting (AREA)

Abstract

Afin de multiplier les possibilités d'application d'un four à micro-ondes et de rendre les aliments qui y sont chauffés, notamment cuits et rôtis, plus digestes et d'une meilleure qualité, des éléments (23, 24, 25, 26; 27) de guidage d'air génèrent de manière appropriée un courant d'air sec et chaud dans la chambre (4a) du four ou chambre de cuisson, ce courant d'air circulant autour de l'aliment à cuire placé sur une grille (33). Une croûte peut ainsi se former rapidement à la surface de l'aliment à cuire, étant donné qu'un écran de vapeur qui absorberait les rayons infrarouges émis par des éléments de chauffage (28) ne peut pas se former. L'aliment à cuire devient ainsi croustillant à l'extérieur et reste juteux à l'intérieur, ce qui est impossible ou difficile à obtenir avec les fours à micro-ondes usuels, ou seulement après une durée de préparation trop longue pour des fours à micro-ondes. Par une conception appropriée on évite en outre que les sources de chaleur aux infrarouges situées au-dessous de l'aliment à cuire (31) ne soient salies par le liquide qui s'égoutte.
PCT/CH1990/000007 1989-01-12 1990-01-12 Four a micro-ondes, aux infrarouges et a convection combine WO1990008449A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH8789 1989-01-12
CH87/89-7 1989-01-12

Publications (1)

Publication Number Publication Date
WO1990008449A1 true WO1990008449A1 (fr) 1990-07-26

Family

ID=4178966

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1990/000007 WO1990008449A1 (fr) 1989-01-12 1990-01-12 Four a micro-ondes, aux infrarouges et a convection combine

Country Status (3)

Country Link
EP (1) EP0417214A1 (fr)
AU (1) AU4805590A (fr)
WO (1) WO1990008449A1 (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2036446A2 (es) * 1991-05-20 1993-05-16 Fagor S Coop Ltda Horno combinado de microondas con grill oculto.
GB2279856A (en) * 1993-06-25 1995-01-11 Merrychef Ltd Microwave heating
EP0747638A1 (fr) * 1995-06-09 1996-12-11 Samsung Electronics Co., Ltd. Four à micro-ondes et à convection
EP0917401A2 (fr) * 1997-11-15 1999-05-19 Lg Electronics Inc. Dispositif pour le refroidissement d'un four micro-ondes avec des lampes chauffantes additionnelles
EP0977467A2 (fr) * 1998-07-29 2000-02-02 Lg Electronics Inc. Dispositif de refroidissement pour lampes halogènes dans les fours à micro-ondes
EP1207721A2 (fr) * 2000-11-10 2002-05-22 Lg Electronics Inc. Dispositif de chauffage destiné aux fours à micro-ondes
WO2002056640A2 (fr) * 2001-01-11 2002-07-18 General Electric Company Four thermique/a convection comprenant des lampes halogenes
DE19908180C2 (de) * 1998-02-27 2003-07-03 Sanyo Electric Co Heizkochvorrichtung mit einem Heizteil, der aus einem Strahlungsheizelement und einem Isolator gebildet ist
DE10203607A1 (de) * 2002-01-30 2003-07-31 Bsh Bosch Siemens Hausgeraete Lichtwellenofen mit Kühlkanal
EP1334644A1 (fr) * 2000-10-24 2003-08-13 TurboChef Technologies, Inc. Four convection compact cuisson rapide
EP2016340A1 (fr) * 2006-05-05 2009-01-21 Electrolux Home Products Corporation N.V. Four de cuisson, en particulier four à utilisation ménagère
US8776675B1 (en) 2010-03-16 2014-07-15 Rom Meris Meat rotisserie and associated method
US20150020404A1 (en) * 2013-07-19 2015-01-22 Tae Hyung Kim Multifunctional microwave oven
US9874358B2 (en) 2015-05-05 2018-01-23 Appliance Innovation, Inc. Oven based on a combination of heated air and infrared heating element
US11009468B2 (en) 2011-08-31 2021-05-18 Goji Limited Object processing state sensing using RF radiation
US11639797B2 (en) 2015-05-05 2023-05-02 Ovention, Inc. Cooking oven having an active vent

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878350A (en) * 1971-07-15 1975-04-15 Sharp Kk Microwave cooking apparatus
US4096369A (en) * 1975-11-20 1978-06-20 Matsushita Electric Industrial Co., Ltd. Microwave oven
DE2755330A1 (de) * 1977-12-12 1979-06-13 Karl Dr Fritz Mikrowellen gar- und brattopf
FR2480412A1 (fr) * 1980-04-14 1981-10-16 Esswein Sa Four a micro-ondes a structure simplifiee
US4409453A (en) * 1976-05-19 1983-10-11 Smith Donald P Combined microwave and impingement heating apparatus
US4481395A (en) * 1982-09-13 1984-11-06 Smith Charles M Restrictive insert for microwave ovens
US4510362A (en) * 1984-05-21 1985-04-09 General Electric Company Microwave oven rack design
US4511779A (en) * 1983-03-07 1985-04-16 Amana Refrigeration, Inc. Microwave oven shelf
GB2152790A (en) * 1983-12-02 1985-08-07 Thorn Emi Domestic Appliances Additional heating in microwave ovens
EP0226407A2 (fr) * 1985-12-11 1987-06-24 THORN EMI Patents Limited Four

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878350A (en) * 1971-07-15 1975-04-15 Sharp Kk Microwave cooking apparatus
US4096369A (en) * 1975-11-20 1978-06-20 Matsushita Electric Industrial Co., Ltd. Microwave oven
US4409453A (en) * 1976-05-19 1983-10-11 Smith Donald P Combined microwave and impingement heating apparatus
DE2755330A1 (de) * 1977-12-12 1979-06-13 Karl Dr Fritz Mikrowellen gar- und brattopf
FR2480412A1 (fr) * 1980-04-14 1981-10-16 Esswein Sa Four a micro-ondes a structure simplifiee
US4481395A (en) * 1982-09-13 1984-11-06 Smith Charles M Restrictive insert for microwave ovens
US4511779A (en) * 1983-03-07 1985-04-16 Amana Refrigeration, Inc. Microwave oven shelf
GB2152790A (en) * 1983-12-02 1985-08-07 Thorn Emi Domestic Appliances Additional heating in microwave ovens
US4510362A (en) * 1984-05-21 1985-04-09 General Electric Company Microwave oven rack design
EP0226407A2 (fr) * 1985-12-11 1987-06-24 THORN EMI Patents Limited Four

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2036446A2 (es) * 1991-05-20 1993-05-16 Fagor S Coop Ltda Horno combinado de microondas con grill oculto.
GB2279856A (en) * 1993-06-25 1995-01-11 Merrychef Ltd Microwave heating
US5483044A (en) * 1993-06-25 1996-01-09 Merrychef Limited Microwave heating with hot and cold air streams
GB2279856B (en) * 1993-06-25 1997-03-05 Merrychef Ltd Microwave Heating
EP0747638A1 (fr) * 1995-06-09 1996-12-11 Samsung Electronics Co., Ltd. Four à micro-ondes et à convection
EP0917401A3 (fr) * 1997-11-15 2000-03-29 Lg Electronics Inc. Dispositif pour le refroidissement d'un four micro-ondes avec des lampes chauffantes additionnelles
EP0917401A2 (fr) * 1997-11-15 1999-05-19 Lg Electronics Inc. Dispositif pour le refroidissement d'un four micro-ondes avec des lampes chauffantes additionnelles
DE19908180C2 (de) * 1998-02-27 2003-07-03 Sanyo Electric Co Heizkochvorrichtung mit einem Heizteil, der aus einem Strahlungsheizelement und einem Isolator gebildet ist
EP0977467A2 (fr) * 1998-07-29 2000-02-02 Lg Electronics Inc. Dispositif de refroidissement pour lampes halogènes dans les fours à micro-ondes
EP0977467A3 (fr) * 1998-07-29 2000-03-29 Lg Electronics Inc. Dispositif de refroidissement pour lampes halogènes dans les fours à micro-ondes
EP1334644A4 (fr) * 2000-10-24 2008-07-23 Turbochef Tech Inc Four convection compact cuisson rapide
EP1334644A1 (fr) * 2000-10-24 2003-08-13 TurboChef Technologies, Inc. Four convection compact cuisson rapide
EP1207721A2 (fr) * 2000-11-10 2002-05-22 Lg Electronics Inc. Dispositif de chauffage destiné aux fours à micro-ondes
EP1207721A3 (fr) * 2000-11-10 2005-07-27 Lg Electronics Inc. Dispositif de chauffage destiné aux fours à micro-ondes
EP1788849A2 (fr) * 2000-11-10 2007-05-23 Lg Electronics Inc. Dispositif de chauffage pour fours à micro-ondes
EP1788849A3 (fr) * 2000-11-10 2007-09-19 Lg Electronics Inc. Dispositif de chauffage pour fours à micro-ondes
WO2002056640A2 (fr) * 2001-01-11 2002-07-18 General Electric Company Four thermique/a convection comprenant des lampes halogenes
WO2002056640A3 (fr) * 2001-01-11 2003-04-17 Gen Electric Four thermique/a convection comprenant des lampes halogenes
DE10203607A1 (de) * 2002-01-30 2003-07-31 Bsh Bosch Siemens Hausgeraete Lichtwellenofen mit Kühlkanal
EP2016340A1 (fr) * 2006-05-05 2009-01-21 Electrolux Home Products Corporation N.V. Four de cuisson, en particulier four à utilisation ménagère
US8776675B1 (en) 2010-03-16 2014-07-15 Rom Meris Meat rotisserie and associated method
US11009468B2 (en) 2011-08-31 2021-05-18 Goji Limited Object processing state sensing using RF radiation
US20150020404A1 (en) * 2013-07-19 2015-01-22 Tae Hyung Kim Multifunctional microwave oven
US9874358B2 (en) 2015-05-05 2018-01-23 Appliance Innovation, Inc. Oven based on a combination of heated air and infrared heating element
US11639797B2 (en) 2015-05-05 2023-05-02 Ovention, Inc. Cooking oven having an active vent

Also Published As

Publication number Publication date
AU4805590A (en) 1990-08-13
EP0417214A1 (fr) 1991-03-20

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