EP2187703B1 - Cooking device with microwave feed - Google Patents

Cooking device with microwave feed Download PDF

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Publication number
EP2187703B1
EP2187703B1 EP08291070A EP08291070A EP2187703B1 EP 2187703 B1 EP2187703 B1 EP 2187703B1 EP 08291070 A EP08291070 A EP 08291070A EP 08291070 A EP08291070 A EP 08291070A EP 2187703 B1 EP2187703 B1 EP 2187703B1
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EP
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Prior art keywords
wall
interior space
aerial
interior
cooking device
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German (de)
French (fr)
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EP2187703A1 (en
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Topinox SARL
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Topinox SARL
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Priority to AT08291070T priority Critical patent/ATE524950T1/en
Priority to EP08291070A priority patent/EP2187703B1/en
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    • 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

Definitions

  • the invention relates to a cooking appliance, comprising: an interior comprising a cooking chamber for receiving food to be cooked; and means for generating microwaves and guiding the microwaves to at least one circularly or elliptically polarized antenna arranged to radiate the microwaves along a direct path into the interior space.
  • the cooking appliance with a microwave antenna and means for exciting the antenna for the purpose of emitting circularly polarized radiation known.
  • the cooking appliance further comprises means for moving the antenna in the form of a turbine driven by an air flow with vertical blades, which leads to a large space requirement and a costly construction.
  • the air flow is generated by a fan located in a space next to the cooking chamber.
  • the microwave energy is coupled via a probe in the antenna, wherein the probe freely rotatable through an opening in a Garraumdecke protrudes into a waveguide. This opening is not hermetically sealed.
  • a generic cooking appliance is from the KR 10 0290708 B known.
  • the known cooking appliance comprises a magnetron connected to a helix antenna.
  • the helical antenna is arranged in a waveguide open to the cooking chamber and has a longitudinal axis which is directed into the cooking chamber.
  • the waveguide is designed in the form of a blunt pyramid.
  • the food to be heated is to be placed on a turntable.
  • the cooking chamber design is not very flexible because, for example, no rack racks or racks can be used for food support.
  • the invention has for its object to overcome the disadvantages of the prior art, at least partially.
  • a cooking appliance with a very good microwave energy distribution which is flexible to use and inexpensive to manufacture, can be delivered without requiring a large amount of space.
  • This object is achieved in that in the interior of a separate from the antenna, at least partially reflecting microwave fan wheel for circulation of atmosphere in the interior and for equalization of the microwave energy distribution in the interior is rotatably arranged.
  • the interior is delimited by at least one wall and / or at least one wall part, and on an interior facing the front of one of the walls or the wall parts, the antenna is arranged, in particular at least a first wall via a wall part in a second Wall passes, extending extensions of the two walls on a side facing away from the interior rear side of the wall part and the antenna is attached to an interior facing front of the wall part.
  • the fan is disposed on the first or the second wall, and / or at least one of the first and the second wall forms a rear wall or side wall of the interior, and / or represent the extensions of the two walls imaginary extensions.
  • At least two antennas are arranged at different levels, preferably one below the other, in the cooking appliance, in particular one antenna, above the axis of rotation of the fan and the other antenna below the axis of rotation of the fan, and / or the fan as Radial fan is formed.
  • each antenna comprises a conductor with at least one turn, in particular a helical antenna, which extends around a longitudinal axis oriented or alignable in the direction of the interior.
  • Embodiments of the invention are preferably, characterized in that the interior is at least partially divided by a flow guide into a pressure chamber and the cooking chamber, the fan and each antenna are in the pressure chamber, and the flow control in a suction of the fan one, in particular centrally, opening has and at least one edge, at least one, in particular slit-shaped, air-permeable opening leaves free.
  • the means for guiding the microwaves comprise at least one microwave guide structure located substantially outside the interior, with a section extending to at least one opening in the wall or the wall part, wherein in particular the section has a fixed, conductive outer wall having a round, in particular circular, cross-sectional shape and / or a coaxial waveguide with an inner conductor which is connectable or connected to a conductor of the arranged at the front of the wall or the wall part antenna comprises.
  • the inner conductor extends to a waveguide encompassed by the microwave guide structure, in which, in particular, at least one antenna extends at least one magnetron.
  • the invention proposes that at least one further device for the treatment of food to be cooked is provided, the further device in particular comprising an electric or gas-operated heater, a heat exchanger, a moisture removal device and / or a moisture supply device.
  • the invention is based on the surprising finding that with at least one circularly or elliptically polarized antenna in a cooking appliance, which is arranged such that it emits microwaves along a direct path into the interior of the cooking appliance, and arranged in the interior of the antennas separate, at least partially reflecting microwave fan impeller a very uniform microwave energy distribution in the interior for cooking on reproducible high quality can be realized.
  • Circular or elliptically polarized radiation (hereinafter only circularly polarized radiation will be mentioned) is to be regarded as radiation with two orthogonal components which are independent of one another and therefore do not interfere.
  • each individual component could still form standing waves, which would lead to different Garzonen in the interior, so a turbulence of the microwaves is forced by means of moving reflecting surfaces of the fan.
  • the combination of circularly polarized microwaves with moving reflecting surfaces is very effective because the orthogonal components of the microwaves are reflected differently, and it is also structurally simpler, movable reflecting surfaces and a stationary Antenna use, since in the case of a moving antenna for an equally good dispersion would need an irregular wall surface.
  • the application of the cooking appliance according to the invention is relatively large in two respects. On the one hand, the use of the fan wheel opens up the possibility of circulating the atmosphere.
  • the fan thus fulfills at least two functions, which saves costs and space.
  • the use of the antenna which emits microwaves along a direct path into the interior, and arranged in the interior, at least partially microwave reflecting fan wheel also means that the cooking appliance can be made more compact, as is the case when in one in addition to the interior waveguide arranged a mode mixture is made.
  • the interior is delimited by at least one wall and / or at least one wall part and the antenna is arranged on an interior of the front wall or the wall part, eliminating the need to guide the microwave waveguide through the interior. Rather, the means for generating microwaves from outside the interior of the antenna to the antenna may be made relatively short and with little lossy transients or angles.
  • At least one first wall merges with the second wall via the wall part, extensions of the two walls intersect at least imaginarily on a rear side of the wall part facing away from the interior, and the antenna is attached to a front side of the wall part facing the interior, then the cooking appliance is made possible even more compact.
  • the wall part leads to a shortening of the two walls and is arranged obliquely to the same, so that outside the interior, namely in the space between the rear side of the wall portion and behind the wall portion intersecting, at least imaginary extensions of the two walls, the means for generating microwaves and at least partially disposable for guiding the microwaves.
  • the first and second walls are walls that extend in at least two, preferably mutually perpendicular, directions over much of the corresponding dimension of the interior so as to substantially define the depth, width or height of the interior.
  • the fan wheel is arranged on the first or the second wall, only an installation space is to be provided adjacent to the interior, in which drive means for the fan wheel and the means for generating microwaves and for guiding the microwaves to the antenna can be arranged.
  • the first or the second wall forms a rear wall or side wall of the interior, the installation space is not located in the bottom area or ceiling area of the cooking appliance. This reduces the overall height of the cooking appliance so that it can be stackable and simplifies the sealing of the wall openings required to connect the antennas to the microwave generating means and the fan to its drive means.
  • At least two antennas are arranged at different levels in the cooking appliance, in particular at levels on opposite sides of the axis of rotation of the fan, it is easier to avoid that the microwave energy is concentrated predominantly in one half of the interior, for example because the fan wheel the interior in two Parts parts. This would otherwise be possible in particular if the fan is designed as a radial fan.
  • the use of a radial fan is quite advantageous because its blades have a relatively large lateral reflecting surface, which reflect well the emitted from the side of the radial fan antennas microwaves.
  • a radial fan is also more efficient in promoting the atmosphere.
  • each antenna comprises a conductor with at least one winding, in particular a helical antenna, which extends around an aligned or alignable longitudinal axis in the direction of the interior, the microwaves are also radiated directly in the direction of the interior. With several turns more energy can be radiated. If the diameter of the turns is not quite equal, microwave energy is delivered with a certain bandwidth.
  • the fan and each antenna in the pressure chamber and the flow guide in an intake of the fan has an opening and at least one edge at least one, in particular slit-shaped, air-permeable opening leaves free, a pressure difference comes about, which allows a circulation of the cooking chamber atmosphere, and each antenna from the cooking chamber and thus, for example. Garagutresten deposited in it is reasonably shielded.
  • the means for guiding the microwaves comprise at least one microwave guide structure substantially outside the interior, with a section extending to at least one opening in the wall or wall part, and the section comprises a solid, conductive outer wall with a round, in particular circular, comprises cross-sectional shape, less heat passes through heat conduction from the interior.
  • a reduction in heat conduction can not be easily achieved by reducing the diameter, because it is essentially determined by the microwave length.
  • the round shape gives the smallest possible cross-sectional area of the conductive outer wall.
  • the means for guiding the microwaves comprises at least one microwave guide structure located substantially outside the interior with a portion extending at least to an opening in the wall portion, and the portion comprises a coaxial waveguide having an inner conductor and a conductor at the front the antenna arranged in the wall part, then the microwave energy can be conducted into the antenna with little loss. Means for coupling microwave energy from the waveguide into the antenna are not required. Another effect of using a coaxial waveguide is that the diameter of this waveguide may be smaller compared to a waveguide without compromising the propagation capability of the microwaves in the waveguide.
  • the inner conductor extends to a waveguide encompassed by the microwave guide structure, it additionally acts as a receiving antenna for microwaves propagating in the waveguide.
  • the use of a waveguide simplifies the coupling of a microwave generator or magnetron.
  • At least one further device for treating food to be cooked may be provided, for example an electric or gas-operated heater, a heat exchanger, a moisture supply device and / or a moisture removal device.
  • an electric or gas-operated heater for example an electric or gas-operated heater, a heat exchanger, a moisture supply device and / or a moisture removal device.
  • the fan thus ensures not only a more even distribution of microwave energy, but also a more uniform temperature distribution and / or moisture distribution, so a substantially homogeneous cooking space climate, so that can be cooked at any point of the oven under the same conditions. This is special for commercial kitchens Importance, because only so reproducible high cooking qualities can be achieved in large quantities.
  • One in the Figures 1 and 2 exemplified cooking appliance 1 comprises an interior whose height is determined essentially by the distance between a ceiling 2 and a bottom surface 3. The depth of the interior is determined by the distance between a cooking chamber door 4 and a rear wall 5.
  • the cooking chamber door 4 closes a framed by a front wall (not shown) opening for placing and removing food (not shown) from.
  • the width of the interior is determined by the distance between parallel left and right side walls 6, 7.
  • the interior is at least partially subdivided by a flow-guiding element 8 into a cooking chamber 9 and a pressure chamber 10.
  • a flow-guiding element 8 In the cooking chamber 9, the food is placeable. It can be provided in the cooking chamber 9, for example, a frame with slots for food support (not shown).
  • the left side wall 6 delimits the interior space from an installation space 11.
  • the installation space can also be arranged behind the rear wall. In the illustrated configuration, however, it is easier to provide an electronic operating device on the front of the cooking appliance 1 next to the cooking chamber door 4, namely in the region of the installation space 11.
  • the side walls 6, 7 and the rear wall 5 extend in the vertical direction over the entire height of the interior. Likewise extend the ceiling 2, floor space 3 and side walls 6,7 over much of the depth of the interior. However, the left side wall 6 does not extend over the entire depth of the interior, because it passes over side wall parts 12, 13 in the rear wall 5 and the front wall with the cooking chamber 4.
  • the side wall parts 12, 13 form bevels. They extend vertically over the entire height of the interior. In an alternative variant, bevels can also be arranged at the vertical ends of the side wall parts 12, 13.
  • two helical antennas 14, 15 are attached or fastened.
  • microwaves are generated by respective magnetrons 16, 17 and guided via waveguide structures 18, 19 through the rear side wall part 12 to the helix antennas 14, 15.
  • the upper helix antenna 14 is shown in more detail. It comprises a helical conductor 20 of approximately three turns about an imaginary longitudinal axis extending vertically from the front of the rear side wall portion 12. In alternative embodiments, more or fewer turns may be provided.
  • a helical conductor 20 of approximately three turns about an imaginary longitudinal axis extending vertically from the front of the rear side wall portion 12. In alternative embodiments, more or fewer turns may be provided.
  • circularly or at least elliptically polarized microwaves are emitted by the helical antenna 14. The radiation energy is mostly aligned along the longitudinal axis of the helical antenna 14.
  • the rear side wall portion 12 By making or coating the rear side wall portion 12 of a microwave reflective material, the majority of the microwave energy is emitted into the pressure space 10.
  • microwave energy is fed into the pressure chamber 10 in all planes.
  • the helix antenna 14 may alternatively be provided to a rod-shaped antenna part 21 which extends parallel to the longitudinal axis of the helical antenna 14.
  • Cooking device shown is optionally the rod-shaped antenna part 21 or the helical antenna 14 by means of a screw detachably fastened to an arranged in the microwave guide structure 18 inner conductor 22.
  • the rod-shaped antenna part 21 or the helix antenna 14 could also be designed as an integral continuation of the inner conductor 22.
  • the inner conductor 22 forms with a round, solid, electrically conductive and cylindrical wall 23 and a likewise round coupling 24, a first portion 25 of the microwave guide structure 18 in the form of a coaxial waveguide.
  • the circular, substantially circular, cross-sectional shape of the coupling 24 and the cylindrical wall 23 minimize thermal bridges between the pressure chamber 10 and the magnetron 16 connected to the microwave guide structure 18.
  • microwaves in the coaxial waveguide are propagatable in the TEM mode. This fashion requires the smallest diameter for spreading. A further reduction of the diameter could be achieved in an alternative embodiment in that between a part of the inner conductor 22 and on the other hand the circular wall 23 and / or the inside of the coupling 24 is a substrate of dielectric material having a higher permittivity than air.
  • the first section 25 merges via a threaded bush 26 into a rectangular waveguide 27.
  • the (in the FIG. 4 not shown) magnetron 16 are fastened by means of a thread 29.
  • an antenna of the magnetron 16 projects into the rectangular waveguide 27.
  • the emitted microwaves are received by the inner conductor 22 and coupled into the first section 25.
  • the inner conductor 22 extends into the rectangular waveguide 27.
  • the inner conductor 22 is fastened to a second flat wall 30 of the rectangular waveguide 27.
  • the inner conductor 22 is bent in the interior of the rectangular waveguide 27. This also ensures that the part of the inner conductor 22 functioning as a receiving antenna absorbs more microwave energy.
  • a disc 34 of dielectric material e.g. steatite, Teflon or glass (such as Pyrex).
  • the disc 34 has a groove 35 in which a (not shown) round seal can be arranged, on.
  • a radial fan 36 is arranged in the pressure chamber 10.
  • the radial fan 36 is driven by a drive shaft 37 from a motor 38 located in the installation space 11.
  • the radial fan 36 sucks through an opening 39 in the flow guide 8 atmosphere, in particular air, steam and vapor, from the cooking chamber 9 and blows it off radially.
  • the flow guide 8 leaves on at least one of its edges more openings 40 free. About these openings 40 in the edge region, the atmosphere passes back into the cooking chamber 9. From an injection device 41, steam, fat or flavorings in the promoted by the radial fan 36 atmosphere can be injected.
  • a heater 42 having heating elements 43 disposed around the centrifugal fan 36 heats the atmosphere conveyed by the radial fan 36.
  • yet another heater 42 is provided.
  • This can, depending on the embodiment, be electric or gas-powered. It can also be designed in the form of a heat exchange device.
  • the flow guide 8 is made of microwave reflective material or coated with such a material. It may be provided in the flow guide 8 for microwave permeable, but airtight window. In any case, the microwave energy can reach the cooking chamber 9 via the openings 40 in the edge region of the flow-guiding member 8 from the pressure chamber 10. With this configuration, the pressure chamber 10 and the cooking chamber 9 form coupled resonators. Therefore, even with only two helical antennas 14, 15, a good distribution of the microwave energy, in particular during operation of the radial fan 36, can be achieved.
  • the distribution of the microwave energy is also improved by making the radial fan 36 at least partially made of microwave reflective material. It therefore acts as a mode mixer, so that the formation of standing waves in the pressure chamber 10 suppressed becomes. Due to the arrangement of the helical antennas 14, 15 laterally of the radial fan 36 on the front side of the side wall portion 12, which is oblique to the rear wall 5, the emitted microwave energy is directed mainly to the central region of the pressure chamber 10.
  • helix antennas 14, 15 are arranged.
  • antennas could also be arranged on the front side wall part 13.
  • the installation space 11 is increased, without affecting the function of the pressure chamber 10 and the radial fan 36 and without the width of the To reduce cooking space 9.
  • the magnetrons 16, 17 and waveguide structures 18, 19 find space in addition to several other facilities for the treatment of food in the installation room 11.
  • the geometry of the cooking appliance regardless of the type of antennas used and the presence of the radial fan, independent meaning, namely, when the cooking appliance an interior, which includes a cooking chamber for receiving food and by at least one wall and / or at least one Wall part is delimited, and comprises means for generating microwaves and for guiding the microwaves to at least one antenna, wherein at least a first wall passes over a wall part in a second wall, at least imaginary extensions of the two walls on the side facing away from the interior rear side of the wall part cut, and at least one of the antennas attached to the interior facing the front of the wall part or attachable.
  • This geometry leads to a particularly compact design.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

The cooking appliance (1) has an interior that includes a cooking chamber (9) for receiving food to be cooked, and elements for generating microwaves, and for guiding the microwaves to a circularly or elliptically polarized antenna (14). A reflective microwave fan (36) is arranged to circulate the atmosphere in the interior and for the homogenization of microwave energy distribution in the interior rotation.

Description

Die Erfindung betrifft ein GargerƤt, umfassend: einen Innenraum, der einen Garraum zur Aufnahme von Gargut umfasst; und Mittel zum Generieren von Mikrowellen und zum FĆ¼hren der Mikrowellen zu zumindest einer zirkular oder elliptisch polarisierten Antenne, die derart angeordnet ist, dass sie die Mikrowellen entlang einem direkten Weg in den Innenraum abstrahlt.The invention relates to a cooking appliance, comprising: an interior comprising a cooking chamber for receiving food to be cooked; and means for generating microwaves and guiding the microwaves to at least one circularly or elliptically polarized antenna arranged to radiate the microwaves along a direct path into the interior space.

Aus der US 4,596,915 ist ein GargerƤt mit einer Mikrowellenantenne und Mitteln zum Anregen der Antenne zwecks Abstrahlung zirkular polarisierter Strahlung bekannt. Das GargerƤt umfasst zudem Mittel zum Bewegen der Antenne in Form einer von einer Luftstrƶmung angetriebenen Turbine mit vertikalen Schaufeln, was zu einem groƟen Platzbedarf und einer auf wƤndigen Konstruktion fĆ¼hrt. Die Luftstrƶmung wird von einem sich in einem neben dem Garraum angeordneten Raum befindenden GeblƤse erzeugt. Die Mikrowellenergie wird Ć¼ber eine Sonde in die Antenne gekoppelt, wobei die Sonde frei drehbar durch eine Ɩffnung in einer Garraumdecke in einen Wellenleiter hineinragt. Diese Ɩffnung ist nicht luftdicht abgedichtet.From the US 4,596,915 is a cooking appliance with a microwave antenna and means for exciting the antenna for the purpose of emitting circularly polarized radiation known. The cooking appliance further comprises means for moving the antenna in the form of a turbine driven by an air flow with vertical blades, which leads to a large space requirement and a costly construction. The air flow is generated by a fan located in a space next to the cooking chamber. The microwave energy is coupled via a probe in the antenna, wherein the probe freely rotatable through an opening in a Garraumdecke protrudes into a waveguide. This opening is not hermetically sealed.

Ein gattungsgemƤƟes GargerƤt ist aus der KR 10 0290708 B bekannt. Das bekannte GargerƤt umfasst ein mit einer Helixantenne verbundenes Magnetron. Die Helixantenne ist in einem zum Garraum offenen Wellenleiter angeordnet und weist eine LƤngsachse auf, die in den Garraum gerichtet ist. Der Wellenleiter ist in Form einer stumpfen Pyramide ausgestaltet. Das zu erwƤrmende Gargut ist auf einen Drehteller zu platzieren. Somit ist die Garraumgestaltung wenig flexibel, weil zum Beispiel keine Hordengestelle oder Gestelle fĆ¼r GarguttrƤger eingesetzt werden kƶnnen.A generic cooking appliance is from the KR 10 0290708 B known. The known cooking appliance comprises a magnetron connected to a helix antenna. The helical antenna is arranged in a waveguide open to the cooking chamber and has a longitudinal axis which is directed into the cooking chamber. The waveguide is designed in the form of a blunt pyramid. The food to be heated is to be placed on a turntable. Thus, the cooking chamber design is not very flexible because, for example, no rack racks or racks can be used for food support.

Der Erfindung liegt die Aufgabe zugrunde, die Nachteile des Stands der Technik zumindest teilweise zu Ć¼berwinden. Insbesondere soll ein GargerƤt mit einer sehr guten Mikrowellenenergieverteilung, das flexibel einzusetzen und gĆ¼nstig herzustellen ist, geliefert werden, ohne einen groƟen Platzbedarf zu fordern.The invention has for its object to overcome the disadvantages of the prior art, at least partially. In particular, a cooking appliance with a very good microwave energy distribution, which is flexible to use and inexpensive to manufacture, can be delivered without requiring a large amount of space.

Diese Aufgabe wird erfindungsgemƤƟ dadurch gelƶst, dass im Innenraum ein von der Antenne getrenntes, zumindest teilweise Mikrowellen reflektierendes LĆ¼fterrad zur Zirkulierung von AtmosphƤre im Innenraum und zur VergleichmƤƟigung der Mikrowellenenergieverteilung im Innenraum drehbar angeordnet ist.This object is achieved in that in the interior of a separate from the antenna, at least partially reflecting microwave fan wheel for circulation of atmosphere in the interior and for equalization of the microwave energy distribution in the interior is rotatably arranged.

Bevorzugt ist dabei, dass der Innenraum durch zumindest eine Wand und/oder zumindest ein Wandteil abgegrenzt ist, und an einer zum Innenraum gewandten Vorderseite einer der WƤnde oder der Wandteile die Antenne angeordnet ist, wobei insbesondere zumindest eine erste Wand Ć¼ber ein Wandteil in eine zweite Wand Ć¼bergeht, sich VerlƤngerungen der beiden WƤnde auf einer vom Innenraum abgewandten Hinterseite des Wandteils schneiden und die Antenne an einer zum Innenraum gewandten Vorderseite des Wandteils angebracht ist.It is preferred that the interior is delimited by at least one wall and / or at least one wall part, and on an interior facing the front of one of the walls or the wall parts, the antenna is arranged, in particular at least a first wall via a wall part in a second Wall passes, extending extensions of the two walls on a side facing away from the interior rear side of the wall part and the antenna is attached to an interior facing front of the wall part.

Dabei kann auch vorgesehen sein, dass das LĆ¼fterrad an der ersten oder der zweiten Wand angeordnet ist, und/oder zumindest eine der ersten und der zweiten Wand eine RĆ¼ckwand oder Seitenwand des Innenraums bildet, und/oder die VerlƤngerungen der beiden WƤnde gedachte VerlƤngerungen darstellen.It can also be provided that the fan is disposed on the first or the second wall, and / or at least one of the first and the second wall forms a rear wall or side wall of the interior, and / or represent the extensions of the two walls imaginary extensions.

Mit der Erfindung wird ferner vorgeschlagen, dass zumindest zwei Antennen auf verschiedenen Ebenen, vorzugsweise untereinander, im GargerƤt angeordnet sind, sich insbesondere eine Antenne, oberhalb der Rotationsachse des LĆ¼fterrads und die andere Antenne unterhalb der Rotationsachse des LĆ¼fterrads befindet, und/oder das LĆ¼fterrad als RadiallĆ¼fterrad ausgebildet ist.With the invention it is further proposed that at least two antennas are arranged at different levels, preferably one below the other, in the cooking appliance, in particular one antenna, above the axis of rotation of the fan and the other antenna below the axis of rotation of the fan, and / or the fan as Radial fan is formed.

Zudem kann vorgesehen sein, dass jede Antenne einen Leiter mit zumindest einer um eine in Richtung des Innenraums ausgerichtete oder ausrichtbare LƤngsachse verlaufenden Windung, insbesondere eine Helixantenne, umfasst.In addition, it may be provided that each antenna comprises a conductor with at least one turn, in particular a helical antenna, which extends around a longitudinal axis oriented or alignable in the direction of the interior.

AusfĆ¼hrungsformen der Erfindung sind vorzugsweise, dadurch gekennzeichnet, dass der Innenraum zumindest teilweise durch ein Strƶmungsleitglied in einen Druckraum und den Garraum aufgeteilt wird, sich das LĆ¼fterrad und jede Antenne im Druckraum befinden, und das Strƶmungsleitglied in einem Ansaugbereich des LĆ¼fterrads eine, insbesondere mittig, Ɩffnung aufweist und an zumindest einem Rand zumindest eine, insbesondere schlitzfƶrmige, luftdurchlƤssige Ɩffnung freilƤsst.Embodiments of the invention are preferably, characterized in that the interior is at least partially divided by a flow guide into a pressure chamber and the cooking chamber, the fan and each antenna are in the pressure chamber, and the flow control in a suction of the fan one, in particular centrally, opening has and at least one edge, at least one, in particular slit-shaped, air-permeable opening leaves free.

Auch kann vorgesehen sein, dass die Mittel zum FĆ¼hren der Mikrowellen zumindest eine im Wesentlichen auƟerhalb des Innenraums gelegene Mikrowellenleitstruktur mit einem Abschnitt, der sich bis mindestens zu einer Ɩffnung in der Wand oder dem Wandteil erstreckt, umfassen, wobei insbesondere der Abschnitt eine feste, leitende ƤuƟere Wand mit einer runden, insbesondere kreisrunden, Querschnittsform und/oder einen koaxialen Wellenleiter mit einem Innenleiter, der mit einem Leiter der an der Vorderseite der Wand oder des Wandteils angeordneten Antenne verbindbar oder verbunden ist, umfasst.It can also be provided that the means for guiding the microwaves comprise at least one microwave guide structure located substantially outside the interior, with a section extending to at least one opening in the wall or the wall part, wherein in particular the section has a fixed, conductive outer wall having a round, in particular circular, cross-sectional shape and / or a coaxial waveguide with an inner conductor which is connectable or connected to a conductor of the arranged at the front of the wall or the wall part antenna comprises.

Dabei wird vorgeschlagen, dass der Innenleiter sich bis zu einem von der Mikrowellenleitstruktur umfassten Hohlleiter erstreckt, in dem sich insbesondere zumindest eine Antenne zumindest eines Magnetrons erstreckt.In this case, it is proposed that the inner conductor extends to a waveguide encompassed by the microwave guide structure, in which, in particular, at least one antenna extends at least one magnetron.

SchlieƟlich wird erfindungsgemƤƟ vorgeschlagen, dass zumindest eine weitere Einrichtung zur Behandlung von Gargut vorgesehen ist, wobei die weitere Einrichtung insbesondere eine elektrische oder gasbetriebene Heizung, einen WƤrmetauscher, eine FeuchtigkeitsabfĆ¼hreinrichtung und/oder eine FeuchtigkeitszufĆ¼hreinrichtung umfasst.Finally, the invention proposes that at least one further device for the treatment of food to be cooked is provided, the further device in particular comprising an electric or gas-operated heater, a heat exchanger, a moisture removal device and / or a moisture supply device.

Der Erfindung liegt die Ć¼berraschende Erkenntnis zugrunde, dass mit zumindest einer zirkular oder elliptisch polarisierten Antenne in einem GargerƤt, die derart angeordnet ist, dass sie Mikrowellen entlang einem direkten Weg in den Innenraum des GargerƤts abstrahlt, und mit einem im Innenraum angeordneten, von der Antennen separaten, zumindest teilweise Mikrowellen reflektierenden LĆ¼fterrad eine sehr gleichmƤƟige Mikrowellenenergieverteilung im Innenraum zum Garen auf reproduzierbar hoher QualitƤt realisiert werden kann. Zirkular oder elliptisch polarisierte Strahlung (im Folgenden wird nur noch von zirkular polarisierter Strahlung die Rede sein) ist als Strahlung mit zwei orthogonalen Komponenten anzusehen, die voneinander unabhƤngig sind und deshalb nicht interferieren. Jede einzelne Komponente kƶnnte aber noch stehende Wellen bilden, die zu unterschiedlichen Garzonen in dem Innenraum fĆ¼hren wĆ¼rden, weshalb eine Verwirbelung der Mikrowellen mittels sich bewegender reflektierender FlƤchen des LĆ¼fterrads erzwungen wird. Die Kombination von zirkular polarisierten Mikrowellen mit sich bewegenden reflektierenden FlƤchen ist dabei sehr effektiv, weil die orthogonalen Komponenten der Mikrowellen unterschiedlich reflektiert werden, wobei es zudem konstruktiv einfacher ist, bewegliche reflektierende FlƤchen und eine stationƤre Antenne einzusetzen, da man im Falle einer sich bewegenden Antenne fĆ¼r eine gleich gute Zerstreuung eine unregelmƤƟige WandoberflƤche brƤuchte. Der Einsatzbereich des erfindungsgemƤƟen GargerƤts ist in zweierlei Hinsicht verhƤltnismƤƟig groƟ. Einerseits wird durch den Einsatz des LĆ¼fterrads die Mƶglichkeit erƶffnet, AtmosphƤre umzuwƤlzen. Andererseits kann durch die Verwirbelung der Mikrowellenenergie in dem GargerƤt, in dem der Innenraum und/oder TeilrƤume des Innenraums ResonatorrƤume bilden, Gargut auf verschiedenen Weisen angeordnet werden. Das LĆ¼fterrad erfĆ¼llt somit zumindest zwei Funktionen, was Kosten und Platz spart. Ferner hat der Einsatz der Antenne, die Mikrowellen entlang einem direkten Weg in den Innenraum abstrahlt, und des im Innenraum angeordneten, zumindest teilweise Mikrowellen reflektierenden LĆ¼fterrads auch zur Folge, dass das GargerƤt kompakter gestaltet werden kann, als es der Fall ist, wenn in einem neben dem Innenraum angeordneten Wellenleiter eine Modenmischung vorgenommen wird.The invention is based on the surprising finding that with at least one circularly or elliptically polarized antenna in a cooking appliance, which is arranged such that it emits microwaves along a direct path into the interior of the cooking appliance, and arranged in the interior of the antennas separate, at least partially reflecting microwave fan impeller a very uniform microwave energy distribution in the interior for cooking on reproducible high quality can be realized. Circular or elliptically polarized radiation (hereinafter only circularly polarized radiation will be mentioned) is to be regarded as radiation with two orthogonal components which are independent of one another and therefore do not interfere. However, each individual component could still form standing waves, which would lead to different Garzonen in the interior, so a turbulence of the microwaves is forced by means of moving reflecting surfaces of the fan. The combination of circularly polarized microwaves with moving reflecting surfaces is very effective because the orthogonal components of the microwaves are reflected differently, and it is also structurally simpler, movable reflecting surfaces and a stationary Antenna use, since in the case of a moving antenna for an equally good dispersion would need an irregular wall surface. The application of the cooking appliance according to the invention is relatively large in two respects. On the one hand, the use of the fan wheel opens up the possibility of circulating the atmosphere. On the other hand, due to the swirling of the microwave energy in the cooking appliance, in which the interior and / or partial spaces of the interior space form resonator chambers, food can be arranged in various ways. The fan thus fulfills at least two functions, which saves costs and space. Furthermore, the use of the antenna which emits microwaves along a direct path into the interior, and arranged in the interior, at least partially microwave reflecting fan wheel also means that the cooking appliance can be made more compact, as is the case when in one in addition to the interior waveguide arranged a mode mixture is made.

Wenn der Innenraum durch zumindest eine Wand und/oder zumindest ein Wandteil abgegrenzt ist und an einer zum Innenraum gewandten Vorderseite der Wand oder des Wandteils die Antenne angeordnet ist, entfƤllt die Notwendigkeit, die Mikrowellen Ć¼ber Wellenleiter durch den Innenraum zu fĆ¼hren. Der Weg von auƟerhalb des Innenraums angeordneten Mitteln zum Generieren von Mikrowellen zu der Antenne kann vielmehr relativ kurz und mit wenig verlustbehafteten ƜbergƤngen oder Winkeln ausgestaltet werden.If the interior is delimited by at least one wall and / or at least one wall part and the antenna is arranged on an interior of the front wall or the wall part, eliminating the need to guide the microwave waveguide through the interior. Rather, the means for generating microwaves from outside the interior of the antenna to the antenna may be made relatively short and with little lossy transients or angles.

Wenn zudem zumindest eine erste Wand Ć¼ber das Wandteil in eine zweite Wand Ć¼bergeht, sich VerlƤngerungen der beiden WƤnde auf einer vom Innenraum abgewandten Hinterseite des Wandteils zumindest imaginƤr schneiden und die Antenne an einer zum Innenraum gewandten Vorderseite des Wandteils angebracht ist, wird ermƶglicht, das GargerƤt noch kompakter zu gestalten. Das Wandteil fĆ¼hrt zu einer VerkĆ¼rzung der beiden WƤnden und ist schrƤg zu denselben angeordnet, so dass auƟerhalb des Innenraum, nƤmlich in dem Raum zwischen der Hinterseite des Wandteils und sich hinter dem Wandteil schneidenden, zumindest imaginƤre VerlƤngerungen der beiden WƤnde die Mittel zum Generieren von Mikrowellen und zum FĆ¼hren der Mikrowellen zumindest zum Teil anordbar sind. Es handelt sich bei der ersten und der zweiten Wand um WƤnde, die sich in zumindest zwei, vorzugsweise senkrecht zueinander stehenden Richtungen Ć¼ber einen GroƟteil der entsprechenden Abmessung des Innenraums erstrecken, so dass sie im Wesentlichen die Tiefe, Breite oder Hƶhe des Innenraums festlegen.If, in addition, at least one first wall merges with the second wall via the wall part, extensions of the two walls intersect at least imaginarily on a rear side of the wall part facing away from the interior, and the antenna is attached to a front side of the wall part facing the interior, then the cooking appliance is made possible even more compact. The wall part leads to a shortening of the two walls and is arranged obliquely to the same, so that outside the interior, namely in the space between the rear side of the wall portion and behind the wall portion intersecting, at least imaginary extensions of the two walls, the means for generating microwaves and at least partially disposable for guiding the microwaves. The first and second walls are walls that extend in at least two, preferably mutually perpendicular, directions over much of the corresponding dimension of the interior so as to substantially define the depth, width or height of the interior.

Wenn das LĆ¼fterrad an der ersten oder der zweiten Wand angeordnet ist, ist nur ein Installationsraum neben dem Innenraum vorzusehen, in dem Antriebsmittel fĆ¼r das LĆ¼fterrad und die Mittel zum Generieren von Mikrowellen und zum FĆ¼hren der Mikrowellen zu der Antenne anordbar sind. Wenn die erste oder die zweite Wand eine RĆ¼ckwand oder Seitenwand des Innenraums bildet, befindet sich der Installationsraum nicht im Bodenbereich oder Deckenbereich des GargerƤts. Dies verringert die Gesamthƶhe des GargerƤts, so dass es stapelbar sein kann, und es vereinfacht die Abdichtung der Wandƶffnungen, die zur Anbindung der Antennen an die Mikrowellengeneriermittel und des LĆ¼fterrads an seine Antriebsmittel erforderlich sind.If the fan wheel is arranged on the first or the second wall, only an installation space is to be provided adjacent to the interior, in which drive means for the fan wheel and the means for generating microwaves and for guiding the microwaves to the antenna can be arranged. If the first or the second wall forms a rear wall or side wall of the interior, the installation space is not located in the bottom area or ceiling area of the cooking appliance. This reduces the overall height of the cooking appliance so that it can be stackable and simplifies the sealing of the wall openings required to connect the antennas to the microwave generating means and the fan to its drive means.

Wenn zumindest zwei Antennen auf verschiedenen Ebenen im GargerƤt angeordnet sind, insbesondere auf Ebenen auf sich gegenĆ¼berliegenden Seiten der Rotationsachse des LĆ¼fterrads, ist es leichter zu vermeiden, dass die Mikrowellenenergie vorwiegend in einer HƤlfte des Innenraums konzentriert ist, etwa weil das LĆ¼fterrad den Innenraum in zwei Teile aufteilt. Dies wƤre sonst insbesondere mƶglich, wenn das LĆ¼fterrad als RadiallĆ¼fterrad ausgebildet ist. Andererseits ist der Einsatz eines RadiallĆ¼fterrads geradezu vorteilhaft, weil seine Schaufeln eine relative groƟe seitliche, reflektierende OberflƤche aufweisen, die die von seitlich des RadiallĆ¼fterrads angeordneten Antennen ausgesandten Mikrowellen gut reflektieren. Ein RadiallĆ¼fterrad ist auch effizienter bei der Fƶrderung der AtmosphƤre.If at least two antennas are arranged at different levels in the cooking appliance, in particular at levels on opposite sides of the axis of rotation of the fan, it is easier to avoid that the microwave energy is concentrated predominantly in one half of the interior, for example because the fan wheel the interior in two Parts parts. This would otherwise be possible in particular if the fan is designed as a radial fan. On the other hand, the use of a radial fan is quite advantageous because its blades have a relatively large lateral reflecting surface, which reflect well the emitted from the side of the radial fan antennas microwaves. A radial fan is also more efficient in promoting the atmosphere.

Wenn jede Antenne einen Leiter mit zumindest einer um eine in Richtung des Innenraums ausgerichteten oder ausrichtbaren LƤngsachse verlaufenden Windung, insbesondere eine Helixantenne, umfasst, werden die Mikrowellen auch direkt in Richtung des Innenraums abgestrahlt. Bei mehreren Windungen kann mehr Energie abgestrahlt werden. Wenn der Durchmesser der Windungen nicht ganz gleich ist, wird Mikrowellenenergie mit einer gewissen Bandbreite abgegeben.If each antenna comprises a conductor with at least one winding, in particular a helical antenna, which extends around an aligned or alignable longitudinal axis in the direction of the interior, the microwaves are also radiated directly in the direction of the interior. With several turns more energy can be radiated. If the diameter of the turns is not quite equal, microwave energy is delivered with a certain bandwidth.

Wenn der Innenraum zumindest teilweise durch ein Strƶmungsleitglied in einen Druckraum und einen Garraum aufgeteilt wird, sich das LĆ¼fterrad und jede Antenne im Druckraum befinden und das Strƶmungsleitglied in einem Ansaugbereich des LĆ¼fterrads eine Ɩffnung aufweist und an zumindest einem Rand zumindest eine, insbesondere schlitzfƶrmige, luftdurchlƤssige Ɩffnung freilƤsst, kommt eine Druckdifferenz zustande, die eine UmwƤlzung der GarraumatmosphƤre ermƶglicht, und wird jede Antenne vom Garraum und somit bspw. sich darin ablagernden Gargutresten einigermaƟen abgeschirmt.If the interior is at least partially divided by a flow guide into a pressure chamber and a cooking chamber, the fan and each antenna in the pressure chamber and the flow guide in an intake of the fan has an opening and at least one edge at least one, in particular slit-shaped, air-permeable opening leaves free, a pressure difference comes about, which allows a circulation of the cooking chamber atmosphere, and each antenna from the cooking chamber and thus, for example. Garagutresten deposited in it is reasonably shielded.

Wenn die Mittel zum FĆ¼hren der Mikrowellen zumindest eine im Wesentlichen auƟerhalb des Innenraums gelegene Mikrowellenleitstruktur mit einem Abschnitt, der sich bis mindestens zu einer Ɩffnung in der Wand oder dem Wandteil erstreckt, umfassen und der Abschnitt eine feste, leitende ƤuƟere Wand mit einer runden, insbesondere kreisrunden, Querschnittsform umfasst, gelangt weniger WƤrme durch WƤrmeleitung aus dem Innenraum. Eine solche Verringerung der WƤrmeleitung kann nicht ohne Weiteres Ć¼ber eine Verringerung des Durchmessers erreicht werden, weil er im Wesentlichen durch die MikrowellenlƤnge bestimmt wird. Die runde Form ergibt bei vorgegebenem Durchmesser die kleinstmƶgliche QuerschnittsflƤche der leitenden ƤuƟeren Wand.If the means for guiding the microwaves comprise at least one microwave guide structure substantially outside the interior, with a section extending to at least one opening in the wall or wall part, and the section comprises a solid, conductive outer wall with a round, in particular circular, comprises cross-sectional shape, less heat passes through heat conduction from the interior. Such a reduction in heat conduction can not be easily achieved by reducing the diameter, because it is essentially determined by the microwave length. For a given diameter, the round shape gives the smallest possible cross-sectional area of the conductive outer wall.

Wenn die Mittel zum FĆ¼hren der Mikrowellen zumindest eine im Wesentlichen auƟerhalb des Innenraums gelegene Mikrowellenleitstruktur mit einem Abschnitt, der sich mindestens bis zu einer Ɩffnung im Wandteil erstreckt, umfassen und der Abschnitt einen koaxialen Wellenleiter mit einem Innenleiter, der mit einem Leiter einer an der Vorderseite des Wandteils angeordneten Antenne verbunden ist, umfasst, dann kann die Mikrowellenenergie mit wenig Verlusten in die Antenne gefĆ¼hrt werden. Einrichtungen zum Auskoppeln von Mikrowellenenergie aus dem Wellenleiter in die Antenne sind nicht erforderlich. Ein weiterer Effekt des Einsatzes eines koaxialen Wellenleiters besteht darin, dass der Durchmesser dieses Wellenleiters im Vergleich zu einem Hohlleiter geringer sein kann, ohne dass die AusbreitungsfƤhigkeit der Mikrowellen im Wellenleiter beeintrƤchtigt wird.When the means for guiding the microwaves comprises at least one microwave guide structure located substantially outside the interior with a portion extending at least to an opening in the wall portion, and the portion comprises a coaxial waveguide having an inner conductor and a conductor at the front the antenna arranged in the wall part, then the microwave energy can be conducted into the antenna with little loss. Means for coupling microwave energy from the waveguide into the antenna are not required. Another effect of using a coaxial waveguide is that the diameter of this waveguide may be smaller compared to a waveguide without compromising the propagation capability of the microwaves in the waveguide.

Wenn sich der Innenleiter bis zu einem von der Mikrowellenleitstruktur umfassten Hohlleiter erstreckt, fungiert er zusƤtzlich als Empfangsantenne fĆ¼r sich im Hohlleiter ausbreitende Mikrowellen. Die Verwendung eines Hohlleiters vereinfacht die Ankopplung eines Mikrowellengenerators bzw. Magnetrons.If the inner conductor extends to a waveguide encompassed by the microwave guide structure, it additionally acts as a receiving antenna for microwaves propagating in the waveguide. The use of a waveguide simplifies the coupling of a microwave generator or magnetron.

Zur weiteren VergrĆ¶ĆŸerung des Einsatzbereichs des GargerƤts kann zumindest eine weitere Einrichtung zur Behandlung von Gargut vorgesehen sein, zum Beispiel eine elektrische oder gasbetriebene Heizung, ein WƤrmetauscher, eine FeuchtigkeitszufĆ¼hreinrichtung und/oder eine FeuchtigkeitsabfĆ¼hreinrichtung. Somit werden die durch die Anwesenheit des LĆ¼fterrads gebotenen Mƶglichkeiten, das Garraumklima zu beeinflussen, weiter ausgenutzt. Das LĆ¼fterrad gewƤhrleistet also nicht nur eine gleichmƤƟigere Verteilung der Mikrowellenenergie, sondern auch eine gleichmƤƟigere Temperaturverteilung und/oder Feuchteverteilung, also ein im Wesentlichen homogenes Garraumklima, so dass an jeder Stelle des Garraums unter den selben Bedingungen gegart werden kann. Dies ist bei GroƟkĆ¼chengargerƤten von besonderer Wichtigkeit, da nur so reproduzierbar hohe GarqualitƤten bei groƟer StĆ¼ckzahl erreicht werden kann.To further increase the range of application of the cooking appliance, at least one further device for treating food to be cooked may be provided, for example an electric or gas-operated heater, a heat exchanger, a moisture supply device and / or a moisture removal device. Thus, the opportunities offered by the presence of the fan to affect the cooking chamber climate, further exploited. The fan thus ensures not only a more even distribution of microwave energy, but also a more uniform temperature distribution and / or moisture distribution, so a substantially homogeneous cooking space climate, so that can be cooked at any point of the oven under the same conditions. This is special for commercial kitchens Importance, because only so reproducible high cooking qualities can be achieved in large quantities.

Weitere Merkmale und Vorteile der Erfindung ergeben sich beispielhaft aus der nachfolgenden detaillierten Beschreibung einer AusfĆ¼hrungsform der Erfindung anhand schematischer Zeichnungen. Dabei zeigt:

Figur 1:
eine Querschnittansicht eines erfindungsgemƤƟen GargerƤts von oben;
Figur 2:
eine LƤngsschnittansicht des GargerƤts der Figur 1;
Figur 3:
eine detaillierte perspektivische Ansicht eines hinteren Eckbereichs eines In- nenraums des GargerƤts der Figuren 1 und 2 von oben; und
Figur 4:
eine Querschnittansicht einer Mikrowellenleitstruktur aus dem GargerƤt der Figuren 1-3.
Further features and advantages of the invention will become apparent from the following detailed description of an embodiment of the invention with reference to schematic drawings. Showing:
FIG. 1:
a cross-sectional view of a cooking appliance according to the invention from above;
FIG. 2:
a longitudinal sectional view of the cooking appliance of FIG. 1 ;
FIG. 3:
a detailed perspective view of a rear corner portion of an interior of the cooking appliance of Figures 1 and 2 from above; and
FIG. 4:
a cross-sectional view of a Mikrowellenleitstruktur from the cooking appliance of Figures 1-3 ,

Ein in den Figuren 1 und 2 beispielhaft dargestelltes GargerƤt 1 umfasst einen Innenraum, dessen Hƶhe im Wesentlichen durch den Abstand zwischen einer Decke 2 und einer BodenflƤche 3 bestimmt wird. Die Tiefe des Innenraums wird durch den Abstand zwischen einer GarraumtĆ¼r 4 und einer RĆ¼ckwand 5 bestimmt. Die GarraumtĆ¼r 4 schlieƟt eine von einer (nicht nƤher dargestellte) Vorderwand umrahmte Ɩffnung zum Platzieren und Entnehmen von Gargut (nicht dargestellt) ab. Die Breite des Innenraums wird durch den Abstand zwischen parallelen linken und rechten SeitenwƤnden 6, 7 bestimmt.One in the Figures 1 and 2 exemplified cooking appliance 1 comprises an interior whose height is determined essentially by the distance between a ceiling 2 and a bottom surface 3. The depth of the interior is determined by the distance between a cooking chamber door 4 and a rear wall 5. The cooking chamber door 4 closes a framed by a front wall (not shown) opening for placing and removing food (not shown) from. The width of the interior is determined by the distance between parallel left and right side walls 6, 7.

Der Innenraum wird von einem Strƶmungsleitglied 8 zumindest teilweise in einen Garraum 9 und einen Druckraum 10 unterteilt. Im Garraum 9 ist das Gargut platzierbar. Es kann im Garraum 9 zum Beispiel auch ein Gestell mit EinschĆ¼ben fĆ¼r GarguttrƤger (nicht gezeigt) vorgesehen sein.The interior is at least partially subdivided by a flow-guiding element 8 into a cooking chamber 9 and a pressure chamber 10. In the cooking chamber 9, the food is placeable. It can be provided in the cooking chamber 9, for example, a frame with slots for food support (not shown).

Die linke Seitenwand 6 grenzt den Innenraum von einem Installationsraum 11 ab. Alternativ kann der Installationsraum auch hinter der RĆ¼ckwand angeordnet sein. In der dargestellten Konfiguration ist es jedoch leichter, eine elektronische Bedieneinrichtung an der Vorderseite des GargerƤts 1 neben der GarraumtĆ¼r 4 vorzusehen, nƤmlich im Bereich des Installationsraums 11.The left side wall 6 delimits the interior space from an installation space 11. Alternatively, the installation space can also be arranged behind the rear wall. In the illustrated configuration, however, it is easier to provide an electronic operating device on the front of the cooking appliance 1 next to the cooking chamber door 4, namely in the region of the installation space 11.

Wie aus den Figuren 1 und 2 ersichtlich, erstrecken sich die SeitenwƤnde 6, 7 und die RĆ¼ckwand 5 in vertikaler Richtung Ć¼ber die gesamte Hƶhe des Innenraums. Ebenso erstrecken sich die Decke 2, BodenflƤche 3 und SeitenwƤnde 6,7 Ć¼ber einen GroƟteil der Tiefe des Innenraums. Die linke Seitenwand 6 erstreckt sich jedoch nicht Ć¼ber die ganze Tiefe des Innenraums, weil sie Ć¼ber Seitenwandteile 12, 13 in die RĆ¼ckwand 5 bzw. die Vorderwand mit der GarraumtĆ¼r 4 Ć¼bergeht. Die Seitenwandteile 12, 13 bilden SchrƤgen. Sie erstrecken sich vertikal Ć¼ber die gesamte Hƶhe des Innenraums. In einer alternativen Variante kƶnnen an den vertikalen Enden der Seitenwandteile 12, 13 auch SchrƤgen angeordnet sein.Like from the Figures 1 and 2 As can be seen, the side walls 6, 7 and the rear wall 5 extend in the vertical direction over the entire height of the interior. Likewise extend the ceiling 2, floor space 3 and side walls 6,7 over much of the depth of the interior. However, the left side wall 6 does not extend over the entire depth of the interior, because it passes over side wall parts 12, 13 in the rear wall 5 and the front wall with the cooking chamber 4. The side wall parts 12, 13 form bevels. They extend vertically over the entire height of the interior. In an alternative variant, bevels can also be arranged at the vertical ends of the side wall parts 12, 13.

An einer zum Innenraum hin gerichteten Seite des hinteren Seitenwandteils 12, die hier als Vorderseite bezeichnet wird, sind zwei Helixantennen 14, 15 befestigt oder befestigbar. Bei eingeschalteter Mikrowellenheizung werden Mikrowellen von jeweiligen Magnetrons 16, 17 erzeugt und Ć¼ber Wellenleitstrukturen 18, 19 durch das hintere Seitenwandteil 12 zu den Helixantennen 14, 15 gefĆ¼hrt.At a side facing the interior of the rear side wall portion 12, which is referred to here as the front, two helical antennas 14, 15 are attached or fastened. When the microwave heating is switched on, microwaves are generated by respective magnetrons 16, 17 and guided via waveguide structures 18, 19 through the rear side wall part 12 to the helix antennas 14, 15.

Aus der Figur 1 geht hervor, dass sich die RĆ¼ckwand 5 und die linke Seitenwand 6 in jeweiligen, gedachten VerlƤngerungen hinter dem hinteren Seitenwandteil 12 schneiden. Der von den VerlƤngerungen und dem hinteren Seitenwandteil 12 definierte Raum, mit in etwa der Form eines Zylinders mit einer dreieckigen Querschnittsform, gehƶrt zum Installationsraum 11. Er verschafft zusƤtzlichen Platz fĆ¼r die Wellenleitstrukturen 18, 19.From the FIG. 1 It can be seen that the rear wall 5 and the left side wall 6 intersect in respective, imaginary extensions behind the rear side wall portion 12. The space defined by the extensions and the rear side wall part 12, with approximately the shape of a cylinder having a triangular cross-sectional shape, belongs to the installation space 11. It provides additional space for the waveguide structures 18, 19.

In der Figur 3 ist die obere Helixantenne 14 nƤher dargestellt. Sie umfasst einen spiralfƶrmigen Leiter 20 mit ungefƤhr drei Windungen um eine sich von der Vorderseite des hinteren Seitenwandteils 12 senkrecht erstreckende, gedachte LƤngsachse. In alternativen AusfĆ¼hrungsformen kƶnnen mehr oder weniger Windungen vorgesehen sein. Durch diese Konfiguration werden von der Helixantenne 14 zirkular oder zumindest elliptisch polarisierte Mikrowellen ausgesendet. Die Strahlungsenergie ist mehrheitlich entlang der LƤngsachse der Helixantenne 14 ausgerichtet. Dadurch, dass das hintere Seitenwandteil 12 aus einem Mikrowellen reflektierenden Material hergestellt oder mit einem solchen Material beschichtet ist, wird die Mehrheit der Mikrowellenenergie in den Druckraum 10 hinein emittiert.In the FIG. 3 the upper helix antenna 14 is shown in more detail. It comprises a helical conductor 20 of approximately three turns about an imaginary longitudinal axis extending vertically from the front of the rear side wall portion 12. In alternative embodiments, more or fewer turns may be provided. By this configuration, circularly or at least elliptically polarized microwaves are emitted by the helical antenna 14. The radiation energy is mostly aligned along the longitudinal axis of the helical antenna 14. By making or coating the rear side wall portion 12 of a microwave reflective material, the majority of the microwave energy is emitted into the pressure space 10.

Aufgrund dieser Strahlungscharakteristik ist es nĆ¼tzlich, dass mehrere Helixantennen 14, 15 vorgesehen sind und dass sie auf unterschiedlichen Hƶhen angeordnet sind. So wird in allen Ebenen Mikrowellenenergie in den Druckraum 10 eingespeist.Because of this radiation characteristic, it is useful to have a plurality of helical antennas 14, 15 and to be arranged at different heights. Thus, microwave energy is fed into the pressure chamber 10 in all planes.

Die Helixantenne 14 kann alternativ zu einem stabfƶrmigen Antennenteil 21, das sich parallel zu der LƤngsachse der Helixantenne 14 erstreckt, vorgesehen sein.The helix antenna 14 may alternatively be provided to a rod-shaped antenna part 21 which extends parallel to the longitudinal axis of the helical antenna 14.

Bei dem in Figur 3 und 4 dargestellten GargerƤt ist wahlweise das stabfƶrmige Antennenteil 21 oder die Helixantenne 14 mittels einer Schraubverbindung lƶsbar an einem in der Mikrowellenleitstruktur 18 angeordneten Innenleiter 22 befestigbar. In einer (nicht dargestellten) alternativen AusfĆ¼hrungsform kƶnnte das stabfƶrmige Antennenteil 21 oder die Helixantenne 14 auch als integrale Fortsetzung des Innenleiters 22 ausgestaltet sein. Der Innenleiter 22 bildet mit einer runden, festen, elektrisch leitenden und zylindrischen Wand 23 und einer ebenfalls runden Kupplung 24 einen ersten Abschnitt 25 der Mikrowellenleitstruktur 18 in Form eines koaxialen Wellenleiters. Die runde, im Wesentlichen kreisrunde, Querschnittsform der Kupplung 24 und der zylindrischen Wand 23 minimieren WƤrmebrĆ¼cken zwischen dem Druckraum 10 und dem mit der Mikrowellenleitstruktur 18 verbundenen Magnetron 16. Zudem sind in dem koaxialen Wellenleiter Mikrowellen in der TEM-Mode ausbreitungsfƤhig. Diese Mode benƶtigt den kleinsten Durchmesser zum Ausbreiten. Eine weitere Verringerung des Durchmessers kƶnnte in einer alternativen AusfĆ¼hrungsform dadurch erreicht werden, dass sich zwischen einerseits dem Innenleiter 22 und andererseits der runden Wand 23 und/oder der Innenseite der Kupplung 24 ein Substrat aus dielektrischem Material mit einer hƶheren PermittivitƤt als Luft befindet.At the in FIG. 3 and 4 Cooking device shown is optionally the rod-shaped antenna part 21 or the helical antenna 14 by means of a screw detachably fastened to an arranged in the microwave guide structure 18 inner conductor 22. In an alternative embodiment (not shown), the rod-shaped antenna part 21 or the helix antenna 14 could also be designed as an integral continuation of the inner conductor 22. The inner conductor 22 forms with a round, solid, electrically conductive and cylindrical wall 23 and a likewise round coupling 24, a first portion 25 of the microwave guide structure 18 in the form of a coaxial waveguide. The circular, substantially circular, cross-sectional shape of the coupling 24 and the cylindrical wall 23 minimize thermal bridges between the pressure chamber 10 and the magnetron 16 connected to the microwave guide structure 18. In addition, microwaves in the coaxial waveguide are propagatable in the TEM mode. This fashion requires the smallest diameter for spreading. A further reduction of the diameter could be achieved in an alternative embodiment in that between a part of the inner conductor 22 and on the other hand the circular wall 23 and / or the inside of the coupling 24 is a substrate of dielectric material having a higher permittivity than air.

Der erste Abschnitt 25 geht Ć¼ber eine Gewindebuchse 26 in einen Rechteckhohlleiter 27 Ć¼ber. An einer ersten flachen Wand 28 des Rechteckhohlleiters 27 kann das (in der Figur 4 nicht dargestellte) Magnetron 16 mittels eines Gewindes 29 befestigt werden. Dabei ragt eine Antenne des Magnetrons 16 in den Rechteckhohlleiter 27 hinein. Die emittierten Mikrowellen werden von dem Innenleiter 22 empfangen und in den ersten Abschnitt 25 hineingekoppelt. Dazu erstreckt sich der Innenleiter 22 bis in den Rechteckhohlleiter 27 hinein. An seinem sich im Rechteckhohlleiter 27 befindenden Ende ist der Innenleiter 22 an einer zweiten flachen Wand 30 des Rechteckhohlleiters 27 befestigt. Um dies zu ermƶglichen, ist der Innenleiter 22 im Inneren des Rechteckhohlleiters 27 gebogen. Dies sorgt auch dafĆ¼r, dass der als Empfangsantenne fungierende Teil des Innenleiters 22 mehr Mikrowellenenergie auffƤngt.The first section 25 merges via a threaded bush 26 into a rectangular waveguide 27. On a first flat wall 28 of the rectangular waveguide 27, the (in the FIG. 4 not shown) magnetron 16 are fastened by means of a thread 29. In this case, an antenna of the magnetron 16 projects into the rectangular waveguide 27. The emitted microwaves are received by the inner conductor 22 and coupled into the first section 25. For this purpose, the inner conductor 22 extends into the rectangular waveguide 27. At its end located in the rectangular waveguide 27, the inner conductor 22 is fastened to a second flat wall 30 of the rectangular waveguide 27. In order to make this possible, the inner conductor 22 is bent in the interior of the rectangular waveguide 27. This also ensures that the part of the inner conductor 22 functioning as a receiving antenna absorbs more microwave energy.

Wie aus den Figuren 3 und 4 hervorgeht, sind in einem flachen mittleren Bereich des hinteren Seitenwandteils 12 runde Ɩffnungen, durch die die Mikrowellen in den Innenraum gefĆ¼hrt werden, angebracht. Insbesondere ist die Kupplung 24 in einer solchen Ɩffnung festgeklemmt. Dazu weist die Kupplung 24 einen Flansch 31 auf, der sich in befestigtem Zustand an der Installationsraumseite bzw. Hinterseite des hinteren Seitenwandteils 12 befindet. An der Vorderseite des hinteren Seitenwandteils 12 befinden sich eine Ɯberwurfmutter 32 und eine Flachdichtung 33. So entsteht eine im Wesentlichen gasdichte Verbindung zwischen der Mikrowellenleitstruktur 18 und dem hinteren Seitenwandteil 12. Alternativerweise kann eine gasdichte Verbindung auch in Form einer SchweiƟverbindung realisiert werden.Like from the Figures 3 and 4 As can be seen, 12 round openings through which the microwaves are guided into the interior, mounted in a flat central region of the rear side wall portion. In particular, the coupling 24 is clamped in such an opening. For this purpose, the coupling 24 has a flange 31, which is in the fastened state on the installation space side or rear side of the rear side wall part 12. At the front of the rear side wall portion 12 are a union nut 32 and a flat gasket 33. This creates a substantially gas-tight connection between the Alternatively, a gas-tight connection can also be realized in the form of a welded joint.

Zum Fixieren des Innenleiters 22 und zur Abdichtung des Inneren des ersten Abschnitts 25 der Mikrowellenleitstruktur 18 ist eine Scheibe 34 aus dielektrischem Material, z.B: Steatit, Teflon oder Glas (wie Pyrex), vorgesehen. Die Scheibe 34 weist eine Nut 35, in der eine (nicht dargestellte) Runddichtung anordbar ist, auf. Dadurch, dass die Helixantenne 14 stationƤr am hinteren Seitenwandteil 12 befestigt ist, ist diese Dichtung einfacher vorzunehmen, als es bei einer drehbaren Antenne der Fall wƤre.For fixing the inner conductor 22 and sealing the interior of the first portion 25 of the microwave guide structure 18, a disc 34 of dielectric material, e.g. steatite, Teflon or glass (such as Pyrex), is provided. The disc 34 has a groove 35 in which a (not shown) round seal can be arranged, on. The fact that the helical antenna 14 is fixedly attached to the rear side wall portion 12, this seal is easier to make than would be the case with a rotatable antenna.

Wie aus den Figuren 1 und 2 hervorgeht, ist im Druckraum 10 ein RadiallĆ¼fterrad 36 angeordnet. Das RadiallĆ¼fterrad 36 wird Ć¼ber eine Antriebswelle 37 von einem sich im Installationsraum 11 befindenden Motor 38 angetrieben. Das RadiallĆ¼fterrad 36 saugt durch eine Ɩffnung 39 im Strƶmungsleitglied 8 AtmosphƤre, insbesondere Luft, Dampf und Wrasen, aus dem Garraum 9 an und blƤst sie radial ab. Das Strƶmungsleitglied 8 lƤsst an zumindest einem seiner RƤnder weitere Ɩffnungen 40 frei. Ɯber diese Ɩffnungen 40 im Randbereich gelangt die AtmosphƤre wieder zurĆ¼ck in den Garraum 9. Von einer Einspritzeinrichtung 41 kƶnnen Dampf, Fett oder Aromastoffe in die vom RadiallĆ¼fterrad 36 gefƶrderte AtmosphƤre eingespritzt werden. Eine Heizeinrichtung 42 mit um das RadiallĆ¼fterrad 36 herum angeordneten Heizelementen 43 erhitzt die von dem RadiallĆ¼fterrad 36 gefƶrderte AtmosphƤre. Somit ist neben der Mikrowellenheizung noch eine weitere Heizeinrichtung 42 vorgesehen. Diese kann, je nach AusfĆ¼hrungsform, elektrisch oder gasbetrieben sein. Sie kann auch in Form einer WƤrmetauscheinrichtung ausgefĆ¼hrt sein.Like from the Figures 1 and 2 shows, in the pressure chamber 10, a radial fan 36 is arranged. The radial fan 36 is driven by a drive shaft 37 from a motor 38 located in the installation space 11. The radial fan 36 sucks through an opening 39 in the flow guide 8 atmosphere, in particular air, steam and vapor, from the cooking chamber 9 and blows it off radially. The flow guide 8 leaves on at least one of its edges more openings 40 free. About these openings 40 in the edge region, the atmosphere passes back into the cooking chamber 9. From an injection device 41, steam, fat or flavorings in the promoted by the radial fan 36 atmosphere can be injected. A heater 42 having heating elements 43 disposed around the centrifugal fan 36 heats the atmosphere conveyed by the radial fan 36. Thus, in addition to the microwave heating yet another heater 42 is provided. This can, depending on the embodiment, be electric or gas-powered. It can also be designed in the form of a heat exchange device.

Das Strƶmungsleitglied 8 ist aus Mikrowellen reflektierendem Material gefertigt oder mit einem solchen Material beschichtet. Es kƶnnen fĆ¼r Mikrowellen durchlƤssige, aber luftdichte Fenster im Strƶmungsleitglied 8 vorgesehen sein. Die Mikrowellenenergie kann auf jeden Fall Ć¼ber die Ɩffnungen 40 im Randbereich des Strƶmungsleitglieds 8 vom Druckraum 10 in den Garraum 9 gelangen. Durch diese Gestaltung bilden der Druckraum 10 und der Garraum 9 gekoppelte Resonatoren. Daher ist auch mit nur zwei Helixantennen 14, 15 eine gute Verteilung der Mikrowellenenergie, insbesondere im Betrieb des RadiallĆ¼fterrads 36, erreichbar.The flow guide 8 is made of microwave reflective material or coated with such a material. It may be provided in the flow guide 8 for microwave permeable, but airtight window. In any case, the microwave energy can reach the cooking chamber 9 via the openings 40 in the edge region of the flow-guiding member 8 from the pressure chamber 10. With this configuration, the pressure chamber 10 and the cooking chamber 9 form coupled resonators. Therefore, even with only two helical antennas 14, 15, a good distribution of the microwave energy, in particular during operation of the radial fan 36, can be achieved.

Die Verteilung der Mikrowellenenergie wird auch dadurch verbessert, dass das RadiallĆ¼fterrad 36 zumindest teilweise aus Mikrowellen reflektierendem Material hergestellt ist. Es fungiert deshalb als Modenmischer, so dass die Bildung stehender Wellen im Druckraum 10 unterdrĆ¼ckt wird. Durch die Anordnung der Helixantennen 14, 15 seitlich des RadiallĆ¼fterrads 36 an der Vorderseite des Seitenwandteils 12, das schrƤg zur RĆ¼ckwand 5 steht, ist die emittierte Mikrowellenenergie vorwiegend auf den zentralen Bereich des Druckraums 10 gerichtet.The distribution of the microwave energy is also improved by making the radial fan 36 at least partially made of microwave reflective material. It therefore acts as a mode mixer, so that the formation of standing waves in the pressure chamber 10 suppressed becomes. Due to the arrangement of the helical antennas 14, 15 laterally of the radial fan 36 on the front side of the side wall portion 12, which is oblique to the rear wall 5, the emitted microwave energy is directed mainly to the central region of the pressure chamber 10.

Dank der oben erwƤhnten MaƟnahmen zur besseren Verteilung der Mikrowellenergie genĆ¼gt es, dass nur am hinteren Seitenwandteil 12 Helixantennen 14, 15 angeordnet sind. In einer alternativen AusfĆ¼hrungsform kƶnnten jedoch auch am vorderen Seitenwandteil 13 Antennen angeordnet sein.Thanks to the above-mentioned measures for better distribution of the microwave energy, it is sufficient that only at the rear side wall portion 12 helix antennas 14, 15 are arranged. In an alternative embodiment, however, antennas could also be arranged on the front side wall part 13.

Durch die Anordnung der Helixantennen 14, 15 an dem hinteren Seitenwandteil 12, das schrƤg zur linken Seitenwand 6 und zur RĆ¼ckwand 5 steht, wird der Installationsraum 11 vergrĆ¶ĆŸert, ohne dass dies die Funktion des Druckraums 10 und des RadiallĆ¼fterrads 36 beeintrƤchtigt und ohne die Breite des Garraums 9 zu reduzieren. Die Gesamtbreite des GargerƤts 1 bleibt jedoch verhƤltnismƤƟig gering. Die Magnetrons 16, 17 und Wellenleitstrukturen 18, 19 finden neben mehreren weiteren Einrichtungen zur Behandlung von Gargut im Installationsraum 11 Platz.By arranging the helical antennas 14, 15 on the rear side wall portion 12, which is oblique to the left side wall 6 and the rear wall 5, the installation space 11 is increased, without affecting the function of the pressure chamber 10 and the radial fan 36 and without the width of the To reduce cooking space 9. The overall width of the cooking appliance 1, however, remains relatively low. The magnetrons 16, 17 and waveguide structures 18, 19 find space in addition to several other facilities for the treatment of food in the installation room 11.

Es steht auch der Geometrie des GargerƤts, unabhƤngig von der Art der verwendeten Antennen und des Vorhandenseins des RadiallĆ¼fterrads, selbstƤndige Bedeutung zu, nƤmlich wenn das GargerƤt einen Innenraum, der einen Garraum zur Aufnahme von Gargut umfasst und durch zumindest eine Wand und/oder zumindest ein Wandteil abgegrenzt ist, und Mittel zum Generieren von Mikrowellen und zum FĆ¼hren der Mikrowellen zu zumindest einer Antenne umfasst, wobei zumindest eine erste Wand Ć¼ber ein Wandteil in eine zweite Wand Ć¼bergeht, sich zumindest imaginƤre VerlƤngerungen der beiden WƤnde auf der vom Innenraum abgewandten Hinterseite des Wandteils schneiden, und zumindest eine der Antennen an der dem Innenraum zugewandten Vorderseite des Wandteils angebracht oder anbringbar ist. Diese Geometrie fĆ¼hrt nƤmlich zu einem besonders kompakten Aufbau.It is also the geometry of the cooking appliance, regardless of the type of antennas used and the presence of the radial fan, independent meaning, namely, when the cooking appliance an interior, which includes a cooking chamber for receiving food and by at least one wall and / or at least one Wall part is delimited, and comprises means for generating microwaves and for guiding the microwaves to at least one antenna, wherein at least a first wall passes over a wall part in a second wall, at least imaginary extensions of the two walls on the side facing away from the interior rear side of the wall part cut, and at least one of the antennas attached to the interior facing the front of the wall part or attachable. This geometry leads to a particularly compact design.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
GargerƤtCooking appliance
22
Deckeblanket
33
BodenflƤchefloor area
44
GarraumtĆ¼roven door
55
RĆ¼ckwandrear wall
66
Linke SeitenwandLeft sidewall
77
Rechte SeitenwandRight side wall
88th
Strƶmungsleitgliedflow directing
99
Garraumoven
1010
Druckraumpressure chamber
1111
Installationsrauminstallation space
1212
Hinteres SeitenwandteilRear side wall part
1313
Vorderes SeitenwandteilFront side wall part
1414
Obere HelixantenneUpper helix antenna
1515
Untere HelixantenneLower helical antenna
1616
Oberes MagnetronUpper magnetron
1717
Unteres MagnetronLower magnetron
1818
Obere WellenleitstrukturUpper waveguide structure
1919
Untere WellenleitstrukturLower waveguide structure
2020
Spiralfƶrmiger LeiterSpiral-shaped conductor
2121
Stabfƶrmiges AntennenteilRod-shaped antenna part
2222
Innenleiterinner conductor
2323
Runde WandRound wall
2424
Kupplungclutch
2525
1. Abschnitt1st section
2626
Gewindebuchsethreaded bushing
2727
RechteckhohlleiterRectangular waveguide
2828
1. Wand des Rechteckhohlleiters1. Wall of the rectangular waveguide
2929
Gewindethread
3030
2. Wand des Rechteckhohlleiters2. Wall of the rectangular waveguide
3131
Flanschflange
3232
ƜberwurfmutterNut
3333
Flachdichtunggasket
3434
Scheibedisc
3535
Nutgroove
3636
RadiallĆ¼fterradradial fan
3737
Antriebswelledrive shaft
3838
Motorengine
3939
Ɩffnungopening
4040
Ɩffnungen im RandbereichOpenings in the edge area
4141
EinspritzeinrichtungInjector
4242
Heizeinrichtungheater
4343
Heizelementeheating elements

Claims (9)

  1. A cooking device (1) comprising:
    an interior space which comprises a cooking chamber (9) for receiving items to be cooked; and means (16, 17, 18, 19) for generating microwaves and for guiding said microwaves to at least one aerial (14, 15) that is circularly or elliptically polarized and is arranged to emit the microwaves into the interior space along a direct path, characterized in that
    a fan wheel (36) which is separated from the aerial (14, 15) and at least partially reflects microwaves is arranged so as to be rotatable in the interior space and serves to circulate the atmosphere in the interior space and to uniform the microwave power distribution in the interior space.
  2. A cooking device according to claim 1, characterized in that
    the interior space is delimited by at least one wall (2, 3, 5, 6, 7) and/or at least one wall part (12, 13), and
    the aerial (14, 15) is arranged on a front side of one of the walls (2, 3, 5, 6, 7) or one of the wall parts (12, 13), which front side faces the interior space, wherein
    in particular at least one first wall (5) changes to a second wall (6) via a wall part (12), extensions of the two walls (5, 6) intersect on a rear side of the wall part (12), which rear side faces away from the interior space, and
    the aerial (14, 15) is mounted to a front side of the wall part (12), which front side faces the interior space.
  3. A cooking device according to claim 2, characterized in that
    the fan wheel (36) is arranged on the first or the second wall (5, 6), and/or
    at least one of the first and second walls (5, 6) forms a rear wall or side wall of the interior space, and/or
    the extensions of the two walls (5, 6) are imaginary extensions.
  4. A cooking device according to any one of the preceding claims, characterized in that
    at least two aerials (14, 15) are arranged in the cooking device (1) on different levels, preferably one below the other, in particular one aerial (14) is located above the axis of rotation of the fan wheel (36) and the other aerial (15) is located below the axis of rotation of the fan wheel (36), and/or
    the fan wheel (36) is designed as a centrifugal fan wheel.
  5. A cooking device according to any one of the preceding claims, characterized in that
    each aerial (14, 15) comprises a conductor (20) including at least one winding which extends about a longitudinal axis that is aligned or can be aligned in the direction of the interior space, in particular a helical aerial.
  6. A cooking device according to any one of the preceding claims, characterized in that
    the interior space is at least partially divided into a pressure chamber (10) and the cooking chamber (9) by a flow guide member (8),
    the fan wheel (36) and each aerial (14, 15) are located in the pressure chamber (10), and
    the flow guide member (8) has an opening (39), which is in particular arranged centrally, in a suction area of the fan wheel (36) and leaves at least one air-permeable opening, which is in particular slit-shaped, on at least one edge.
  7. A cooking device according to any one of claims 2 to 6, characterized in that
    the means for guiding the microwaves comprise at least one microwave guide structure (18, 19) which is substantially located outside the interior space and includes a portion (25) extending at least to an opening in the wall (2, 3, 5, 6, 7) or the wall part (12), wherein
    in particular the portion (25) comprises a solid, conductive outer wall (23, 24) having a round, in particular circular, cross-sectional shape and/or a coaxial wave conductor including an inner conductor (22) which can be connected or is connected to a conductor (20) of the aerial (14, 15) that is arranged on the front side of the wall or the wall part (12).
  8. A cooking device according to claim 7, characterized in that
    the inner conductor (22) extends to a hollow conductor which is comprised by the microwave guide structure (18, 19) and in which in particular at least one aerial of at least one magnetron (16, 17) extends.
  9. A cooking device according to any one of the preceding claims, characterized in that
    at least one further device (41, 42, 43) for the treatment of items to be cooked is provided, wherein
    the further device is in particular an electric or gas-fired heater (42, 43), a heat exchanger, a device for removing humidity and/or a device for supplying humidity.
EP08291070A 2008-11-17 2008-11-17 Cooking device with microwave feed Active EP2187703B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT08291070T ATE524950T1 (en) 2008-11-17 2008-11-17 COOKING APPARATUS WITH MICROWAVE POWER
EP08291070A EP2187703B1 (en) 2008-11-17 2008-11-17 Cooking device with microwave feed

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08291070A EP2187703B1 (en) 2008-11-17 2008-11-17 Cooking device with microwave feed

Publications (2)

Publication Number Publication Date
EP2187703A1 EP2187703A1 (en) 2010-05-19
EP2187703B1 true EP2187703B1 (en) 2011-09-14

Family

ID=40640262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08291070A Active EP2187703B1 (en) 2008-11-17 2008-11-17 Cooking device with microwave feed

Country Status (2)

Country Link
EP (1) EP2187703B1 (en)
AT (1) ATE524950T1 (en)

Families Citing this family (2)

* Cited by examiner, ā€  Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017105320A1 (en) * 2017-03-14 2018-09-20 Vorwerk & Co. Interholding Gmbh System for preparing at least one food
DE102022109511A1 (en) 2022-04-20 2023-10-26 Muegge Gmbh Device for supplying microwaves into a treatment room

Family Cites Families (2)

* Cited by examiner, ā€  Cited by third party
Publication number Priority date Publication date Assignee Title
US4596915A (en) 1985-05-07 1986-06-24 Amana Refrigeration, Inc. Microwave oven having resonant antenna
KR100290708B1 (en) 1997-10-09 2001-09-22 źµ¬ģžķ™ Uniform heating assembly of microwave oven

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ATE524950T1 (en) 2011-09-15

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