EP2187701A1 - Dispositif d'alimentation en micro-ondes dans un appareil de cuisson, appareil de cuisson en étant doté et procédé correspondant - Google Patents

Dispositif d'alimentation en micro-ondes dans un appareil de cuisson, appareil de cuisson en étant doté et procédé correspondant Download PDF

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Publication number
EP2187701A1
EP2187701A1 EP08291075A EP08291075A EP2187701A1 EP 2187701 A1 EP2187701 A1 EP 2187701A1 EP 08291075 A EP08291075 A EP 08291075A EP 08291075 A EP08291075 A EP 08291075A EP 2187701 A1 EP2187701 A1 EP 2187701A1
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EP
European Patent Office
Prior art keywords
antenna
antennas
resonator
chamber
microwaves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08291075A
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German (de)
English (en)
Other versions
EP2187701B1 (fr
Inventor
Ralf Klukas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Topinox SARL
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Topinox SARL
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Publication date
Application filed by Topinox SARL filed Critical Topinox SARL
Priority to EP08291075.3A priority Critical patent/EP2187701B1/fr
Publication of EP2187701A1 publication Critical patent/EP2187701A1/fr
Application granted granted Critical
Publication of EP2187701B1 publication Critical patent/EP2187701B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/70Feed lines
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/70Feed lines
    • H05B6/704Feed lines using microwave polarisers
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/72Radiators or antennas

Definitions

  • the present invention relates to a device for feeding microwaves into an interior of a cooking appliance, comprising: at least one resonator chamber, at least two antennas associated with the resonator chamber, each having the radiation characteristic of a dipole antenna in which substantially no microwave power is emitted along an antenna axis, and means for Supplying microwaves of wavelength ⁇ to the antennas, the two antennas emitting radiation substantially orthogonal to each other.
  • the present invention also relates to a cooking appliance with such a device and a method for feeding microwaves into an interior of such a cooking appliance.
  • a generic device for feeding microwaves into the working space of a dielectric heating device for heating foodstuffs in which a plurality of coupling systems feeding microwaves into the working space, each of which is adapted to the working space, are provided With respect to each other, each system feeds the microwaves with a different polarity.
  • the ceiling of the work space is z. B. provided with two coupling systems, each having on edges of openings in the ceiling patch cylindrical tubes, where pipe sockets are arranged, have. For example, coaxial lines are supplied to these pipe sockets, which are supplied by magnetron tubes Apply microwave energy to the coupling systems.
  • the invention is therefore based on the object to develop the generic device such that the disadvantages of the prior art are at least partially overcome.
  • a simple, unobtrusive construction should be delivered.
  • each antenna is mounted on a wall of the resonator chamber, and the antenna axes are aligned in directions substantially perpendicular to each other.
  • each antenna is designed either as a rod antenna or slot antenna and / or represents a ⁇ / 4 antenna, wherein the two antennas are made the same or different.
  • Each wall of the resonator cavity may be substantially parallel to an opposite wall of the resonator cavity.
  • the resonator chamber is arranged separately from the interior of the cooking appliance, preferably in the form of a resonator box, in particular a cuboid, and a device for decoupling the microwaves from the resonator cavity is provided.
  • the decoupling device comprises at least one, in particular elongated window provided in an electrically conductive wall of the resonator chamber and / or at least one antenna element, in particular at least one for each of two orthogonal polarization directions, wherein preferably the antenna elements have two slots , in particular in pairs, form, preferably in the form of a cross, in particular Maltese cross, or a T.
  • the microwave supply means comprises at least one magnetron and / or at least one oscillator device which is connected via at least one waveguide to the resonator chamber or is mounted directly on the resonator chamber or are.
  • each waveguide is designed as a coaxial conductor or waveguide, wherein preferably in the case of a coaxial conductor each associated antenna is formed as a rod antenna in the form of a continuation of the inner conductor of the coaxial conductor and / or in the case of a waveguide each associated antenna as Slot antenna is formed in a wall.
  • the invention also provides a cooking appliance with an interior, comprising a cooking chamber, preferably with an interior and a flow guide, which divides the interior into a cooking chamber and a pressure chamber, and with at least one treatment device for food in the cooking chamber, which is characterized in that the treatment device comprises at least one device according to the invention.
  • the treatment device may comprise an electric or gas-operated heating device, a heat exchange device, a cooling device, a moisture supply device, a moisture removal device, a ventilation device, a venting device, at least one sensing device and / or a control or regulating device, wherein the control or regulating device preferably with all Components of the treatment device is in operative connection.
  • the invention provides a method for feeding microwaves into an interior of a cooking device, in particular with a device according to the invention, comprising: providing at least one resonator chamber and emitting microwaves via at least two antennas associated with the resonator chamber, which have the radiation characteristics of dipole antennas,
  • the invention is characterized in that orthogonal polarized microwaves are radiated directly into the resonator via the respective antennas.
  • the invention is based on the surprising finding that the use of at least two antennas ensures the delivery of a sufficiently large power, which is particularly important for a cooking appliance for large kitchen use.
  • the supplied microwave power can also be partially controlled by turning on and off the microwave supply from one of the two antennas.
  • the two antennas assigned to a resonator space have the radiation characteristics of dipole antennas according to the invention, they radiate microwaves with a linear polarization. Since the antenna axes are each aligned essentially parallel to two vertical spatial axes, one of the two antennas does not receive the microwaves emitted by the other antenna. This protects a microwave generator used for the supply or the microwave generators used for the supply, depending on the embodiment.
  • the fact that the antennas are mounted on a wall of the resonator space, no adjustments to a waveguide are required to ensure a vertical orientation of the microwaves.
  • each antenna is designed either as a rod antenna or slot antenna and / or represents a ⁇ / 4 antenna, wherein the antennas are struck the same or different.
  • One effect of a different design of the two antennas is that the installation of the device in a cooking appliance can be simplified. For example, a slot antenna occupies less space in the interior of the cooking appliance, but requires a waveguide and thus more space outside the Resonatorraums.
  • each wall of the resonator chamber runs substantially parallel to an opposite wall, this has the consequence that, with reflections in the resonator chamber, there is no change in the vertical alignment of the microwaves emitted by the respective antennas.
  • the resonator space has approximately the shape of a parallelepiped, in the simplest design of a cuboid, in which, ideally, the radiated from the two antennas microwaves propagate independently.
  • the resonator space is arranged separately from the interior of the cooking appliance, preferably in the form of a resonator box, in particular cuboidal, with means being provided for coupling the microwaves out of the resonator cavity, this means that no objects are present during use of the cooking appliance which reflections which would destroy the vertical orientation of the microwaves, could be placed in the resonator cavity. Also, microwave absorption can be substantially avoided.
  • the resonator can be made varied by its separation from the cooking chamber and optionally pressure chamber, in particular in the way that as little energy is fed back to the two transmitting antennas, while the oven can meet other requirements. However, it is not ruled out that the microwaves coupled from the resonator chamber are coupled into a pressure chamber arranged next to the actual cooking chamber and communicating with the cooking chamber at least thermally, preferably physically.
  • the decoupling means comprise elongated windows and / or antenna elements provided in an electrically conductive wall of the resonator chamber, at least one for each of two orthogonal polarization directions, wherein preferably the antenna elements form two slots, in particular in pairs, preferably in the shape of a cross, in particular a cross of Maltese , or a T, causes an antenna element, depending on its orientation, to respond only to the waves emitted by one of the two transmitting antennas.
  • crossed elongated antenna elements these are also located in one and the same area, so that the same amount of power, namely the substantially maximum possible power, can be coupled out of both.
  • the crossed antenna elements can For example, be arranged centrally on a wall of the resonator. If the decoupling means comprise elongated windows provided in an electrically conductive wall of the resonator chamber, it is easy to provide decoupling elements having a dipole characteristic which react only to microwaves having a specific polarization.
  • the microwave supply means comprise at least one magnetron and / or an oscillator device which is connected to the resonator chamber via a waveguide or is or are attached directly to the resonator chamber.
  • microwave sources are capable of delivering high power.
  • the waveguide is designed as a coaxial conductor or waveguide.
  • the respectively connected antenna is preferably designed as a rod antenna in the form of a continuation of the inner conductor of the coaxial conductor. If the rod antenna is designed in the form of a continuation of the inner conductor of the coaxial conductor, the number of components is reduced.
  • the respectively associated antenna is preferably formed as a slot antenna in a wall. Also this version with the slot antenna in the wall is easy to make.
  • the method according to the invention is characterized by simple feasibility and by the possibility of high power extraction without harmful feedback to the microwave source or sources.
  • FIG. 1 Is exemplary in the FIG. 1 a cooking appliance 1 in the form of a combination of a Schuumluftofen and a microwave oven shown.
  • the cooking appliance 1 has a technology room 2 and a further interior space 3.
  • the interior space 3 is divided by a flow-guiding element 4 into a pressure space 5 and an actual cooking space 6. The latter is used to hold food (not shown).
  • Air circulation is generated in a manner known per se by a radial fan 7, which is driven by a motor 8 arranged in the engine room 2 via a shaft.
  • the radial fan 7 sucks air from the cooking chamber 6 through a central opening 9 in the flow control member 4.
  • the air passes through column 10 between the flow guide 4 and the wall of the interior 3 back into the cooking chamber. 6
  • microwaves are emitted from a feed device 11, which is arranged on a rear wall 12 of the inner space 3, into the pressure chamber 5.
  • the microwaves pass from the pressure chamber 5 essentially through the gaps 10 into the cooking chamber 6.
  • microwaves can also pass directly through the flow-directing element 4.
  • a feed device 13 can be arranged in this way be that microwaves are fed directly into the cooking chamber 6, for example by attachment to a ceiling 14 of the interior.
  • the homogeneity of the microwave distribution in the internal space 3 is increased by reflecting microwaves on the radial fan 7.
  • an additional mode mixer 15 such as a rotating impeller, may be mounted in or on the interior 3, with two mode mixers 15 being provided in the case of two feed devices 11, 13.
  • microwaves fed to the feed device 11 are generated by two microwave generators 16, 17.
  • Magnetrons are usually used as microwave generators 16, 17 since they can be produced inexpensively in large series and can generate high powers.
  • the microwaves are guided via waveguides 18, 19 to a resonator box 20 of the feed device 11, see also FIGS Figures 2-4 , If the power of two magnetrons is not necessary or desirable, both waveguides 18, 19 can also be fed by a single magnetron. Alternatively, more than two magnetrons can be used.
  • the microwave generators 16, 17 are disposed in the vicinity of the resonator box 20; However, they can also be arranged at a greater distance from the interior 3, which simplifies the cooling.
  • the in the FIG. 1 feeding device 13 shown as an alternative can be fed via waveguides (not shown) from magnetrons arranged in the technology room 2.
  • waveguides 18, 19 are used in the form of coaxial waveguides.
  • Rod antennas 21, 22, which are arranged on respective side walls 23, 24 of the resonator box 20 and project into the resonator box 20, are supplied with microwaves by the waveguides 18, 19, so that the microwaves can be radiated via the antennas 21, 22.
  • waveguides it would be possible to use slot antennas mounted on the walls.
  • the rod antennas 21,22 in conjunction with the (electrically conductive) side walls 23,24 from which they protrude dipole antennas.
  • the antennas 21, 22 may be formed as ⁇ / 4 antennas. That is, the antennas 21, 22 have a length approximately equal to half the wavelength of the generated microwaves, so that they resonate. The exact length required depends on the diameter of the antennas 21, 22 in a manner known per se.
  • the antenna field is the field of a dipole antenna, so that substantially no energy is radiated along the longitudinal axis of the antennas 21, 22. The emitted waves are thus linearly polarized.
  • a slot antenna and a rod antenna can be used, in which case the longitudinal axes lie in mutually perpendicular surfaces and would have to be aligned parallel to mutually perpendicular spatial axes, so that the antennas emit essentially polarized radiation orthogonal to one another.
  • the microwaves radiated by the first rod antenna 21 reflect on a rear wall 25, on two further side walls 26, 27 and on a front wall 28 of the resonator box 20 facing the interior 3.
  • the microwaves radiated by the second rod antenna 22 reflect on other side walls 23, 27, the back wall 25 and the front wall 28. Due to the cuboid shape of the Resonatorbox 20 in the plane of the coupling out of the microwaves, the waves radiated by the respective antennas 21,22 retain their orthogonal polarization in comparison to each other.
  • a cross-slot antenna 29 is mounted in the front wall 28, a cross-slot antenna 29 is mounted.
  • the cross-slot antenna 29 is arranged substantially centrally in the front wall 28, because there the field strengths are highest, so that a relatively large amount of energy is coupled into the interior space 3.
  • further cross-slotted antennas are mounted on the front wall 28 with similar orientations.
  • the cross-slot antenna 29 comprises four antenna elements 30a, 30b, 31a, 31b, of which two are each arranged for coupling out polarized microwaves for each of two orthogonal directions of polarization.
  • Each antenna element pair 30, 31 has an overall length of approximately half the wavelength. Depending on the width of the antenna elements 30a, 30b, 31a, 31b and mode structure, the length is slightly less than half the microwave length.
  • the microwaves emitted by the first rod antenna 21 are decoupled.
  • the slot 31 formed by a second pair of antenna elements 31a and 31b the microwaves emitted by the second rod antenna 22 are decoupled.
  • the cross-slot antenna 29 has the shape of a Maltese cross. This shape increases the frequency bandwidth. As a result, the coupling is less sensitive to mechanical tolerances and different loads in the cooking chamber.
  • slot antennas in the side walls 23, 24 were used instead of the rod antennas 21, 22, then they would have to be arranged substantially parallel to the slots 30, 31 on the side walls 23, 24 which are perpendicular to the front wall 28.
  • microwave generators 32, 33 are arranged directly on the resonator box 34.
  • the generators 32, 33 each comprise an oscillator device for generating microwaves and a decoupling element, in this case an antenna 35, 36, which extends into a resonator structure of the oscillator device.
  • Each antenna 35,36 decouples microwaves generated in the respective oscillator device from the microwave source.
  • the antennas 35, 36 guide the coupled-out microwaves through a gate in a respective wall 37, 38 of the resonator box 34 and are spatially arranged so that radiation along a direct path into the resonator box 34 is ensured by protruding into the resonator box 34.
  • one microwave generator 32 has the smallest possible effect on the other microwave generator 33 and vice versa.
  • This property is enhanced by the fact that the resonator box 34, from which microwaves having different polarization directions are coupled via a cross-slot antenna 39 in a front wall 40 substantially perpendicular to the walls 37, 38, independently of each other, is accommodated in the interior 3, ie no microwave-absorbing load "is empty. Reflections on objects arranged in the inner space 3, in particular the goods to be eaten, have substantially no effect on the microwave generators 32, 33.
  • the walls of the resonator can be made of an electrically conductive material or provided with a conductive layer.
  • a third (not shown) embodiment can be dispensed with a resonator by the interior 3, ie the pressure chamber 5 and / or the cooking chamber 6, two antennas are assigned, each having an antenna axis, along in the Essentially no power is sent out.
  • Each of the two antennas is mounted on a wall of the resonator chamber formed by the cooking chamber 6 and / or pressure chamber 5, in such a way that the antenna axes are perpendicular to each other.
  • one antenna is mounted on the rear wall 12 and the other antenna is mounted on the ceiling 14 or one of two side walls.
  • one of the antennas is attached to the ceiling 14 and the other antenna is attached to one of the side walls.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
EP08291075.3A 2008-11-17 2008-11-17 Dispositif d'alimentation en micro-ondes dans un appareil de cuisson, appareil de cuisson en étant doté et procédé correspondant Expired - Fee Related EP2187701B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08291075.3A EP2187701B1 (fr) 2008-11-17 2008-11-17 Dispositif d'alimentation en micro-ondes dans un appareil de cuisson, appareil de cuisson en étant doté et procédé correspondant

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EP08291075.3A EP2187701B1 (fr) 2008-11-17 2008-11-17 Dispositif d'alimentation en micro-ondes dans un appareil de cuisson, appareil de cuisson en étant doté et procédé correspondant

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EP2187701A1 true EP2187701A1 (fr) 2010-05-19
EP2187701B1 EP2187701B1 (fr) 2016-08-24

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016221447A1 (de) 2016-11-02 2018-05-03 BSH Hausgeräte GmbH Haushalts-Gargerät
DE102015109685B4 (de) 2015-06-17 2024-05-23 Topinox Sarl Gargerät mit einer Mikrowellenquelle sowie Antenne für ein Gargerät

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1081987B (de) * 1959-05-16 1960-05-19 Philips Patentverwaltung Anordnung zur Einspeisung von Mikrowellenenergie in den Arbeitsraum einer dielektrischen Erwaermungsvorrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1081987B (de) * 1959-05-16 1960-05-19 Philips Patentverwaltung Anordnung zur Einspeisung von Mikrowellenenergie in den Arbeitsraum einer dielektrischen Erwaermungsvorrichtung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015109685B4 (de) 2015-06-17 2024-05-23 Topinox Sarl Gargerät mit einer Mikrowellenquelle sowie Antenne für ein Gargerät
DE102016221447A1 (de) 2016-11-02 2018-05-03 BSH Hausgeräte GmbH Haushalts-Gargerät
WO2018083006A1 (fr) 2016-11-02 2018-05-11 BSH Hausgeräte GmbH Appareil électroménager de cuisson
US10986704B2 (en) 2016-11-02 2021-04-20 BSH Hausgeräte GmbH Household cooking appliance

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Publication number Publication date
EP2187701B1 (fr) 2016-08-24

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