EP0632678A1 - Dispositif pour chauffage par micro-ondes - Google Patents

Dispositif pour chauffage par micro-ondes Download PDF

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Publication number
EP0632678A1
EP0632678A1 EP94105278A EP94105278A EP0632678A1 EP 0632678 A1 EP0632678 A1 EP 0632678A1 EP 94105278 A EP94105278 A EP 94105278A EP 94105278 A EP94105278 A EP 94105278A EP 0632678 A1 EP0632678 A1 EP 0632678A1
Authority
EP
European Patent Office
Prior art keywords
microwave
distributor
cavity
microwaves
microwave distributor
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
EP94105278A
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German (de)
English (en)
Other versions
EP0632678B1 (fr
Inventor
Anders C/O Whirlpool Italia S.R.L. Ekstrom
Sven-Olof C/O Whirlpool Italia S.R.L. Johansson
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.)
Whirlpool Europe BV
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Whirlpool Europe BV
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Filing date
Publication date
Application filed by Whirlpool Europe BV filed Critical Whirlpool Europe BV
Publication of EP0632678A1 publication Critical patent/EP0632678A1/fr
Application granted granted Critical
Publication of EP0632678B1 publication Critical patent/EP0632678B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6402—Aspects relating to the microwave cavity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • 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
    • H05B6/70—Feed lines
    • H05B6/707—Feed lines using waveguides
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/74—Mode transformers or mode stirrers

Definitions

  • the present invention relates to a method for feeding microwaves to a microwave heating device, and to a microwave heating device comprising a microwave source for generating microwaves, a cavity in which a load is placed during a heating procedure and means for feeding microwaves into the cavity via feed points.
  • microwave heating devices for example microwave ovens
  • the microwaves which are generated by a microwave source or magnetron, are supplied in various ways to the cavity of the microwave heating device via one or more feed points.
  • US 4,336,434 discloses such a microwave oven.
  • the oven is provided with a waveguide lying outside the cavity and two feed points. Additionally, a stirrer or antenna is disposed within the waveguide.
  • a microwave field is formed having energy maxima and minima (also known as peaks and nodes) at certain positions. This phenonomen is well known in the technical field and results in the load (for example a food item which is to be cooked) receiving an uneven heating result.
  • the stirrer in the waveguide, the positions of these peaks and nodes can be shifted during the heating procedure.
  • the principle of operation is that the stirrer is set into rotation, for example by letting an airflow pass through the waveguide or with an electric motor, which results in a more even microwave field being produced in the cavity.
  • the above patent is silent as to how the stirrer should be driven aside from that it is accomplished with an airflow or an electric motor.
  • the prior art ovens are constructed to give the most even microwave field possible in the cavity, i.e. an even power distribution.
  • an even power distribution does not provide the desired even heat distribution in a load which requires an uneven power distribution to become uniformly warm, e.g. a spread out, non-homogeneous load.
  • the object of the present invention is to provide a method for feeding microwave energy into a cavity, and a microwave heating device for use therefor, which do not exhibit the abovementioned limitations and which enable control of the microwave field depending on the load which is to be processed.
  • the method is characterized in that the microwaves are supplied to a microwave distributor which is common to the feed points, controllable and located outside the cavity; the microwaves are conducted through the microwave distributor to the feed points; the microwaves are distributed to the respective feed points by a coupling factor between the microwave distributor and each of the feed points which is varied whereby each feed point is made, during a time segment of the heating procedure, to feed an individually determinable amount of microwave energy; and the heating operation is carried out by controlling the microwave distribution in accordance with parameter values specifying a desired heating procedure for the load.
  • One way to provide the abovementioned control in the method is characterized in that the microwave distributor is controlled by predetermined parameter values which are stored in a memory, the parameter values being collected from a table in accordance with a time function which specifies the heating procedure.
  • a further way to provide the abovementioned control in the method is characterized in that measurements are continuously or intermittently sensed during the heating procedure by sensing means; the measurements are processed in a processor to obtain the relevant parameter values for the current state of the load; and the microwave distributor is controlled in accordance with the thus obtained parameter values.
  • a microwave heating device in accordance with the invention is characterized by a feed device incorporated in the means for feeding microwaves into the cavity, which feed device comprises an entry port for receiving microwaves from the microwave source, a microwave distributor which is common to the feed points and to which microwaves are conducted from the entry port, and microwave distributor means for distributing the microwaves to the feed points by variation of a coupling factor between the microwave distributor and the feed points.
  • Preferred embodiments of the microwave heating device of the invention may display one or more of the following characteristics: that the microwave heating device comprises waveguide means arranged to connect the microwave distributor with each feed point to conduct microwave energy into the cavity, the microwave distributor comprising a microwave distributor housing and the microwave distributor means; that the feed device is entirely located outside the cavity; that the microwave distributor means comprises a microwave distribution member which is rotatably disposed in the microwave distributor housing, a drive mechanism being arranged to move the microwave distributor member in accordance with control signals from the control means.
  • a microwave heating device in which an individually controllable amount of microwave energy can be fed to the cavity from a plurality of feed points.
  • the feed device in its entirety is located outside the cavity, it may advantageously be combined with a grilling element located in the roof of the cavity.
  • the control may include that the member is rotated with a variable speed during an individual revolution or alternatively the member is positioned with a stepping motor.
  • the microwave field, its phase, the amplitudes of the peaks and nodes, and their position in the cavity may be varied over time, as desired, during a heating procedure. In certain cases it is desirable to obtain as even a distribution of microwave energy as possible, while in other cases it is desirable to direct more energy toward certain positions in the cavity. This is determined by a number of different factors such as, for example, the nature and size of the load which influences how much of the microwave energy supplied to the load is respectively constituted by directly transmitted microwaves, and by microwaves which have been reflected from the walls, roof and floor of the cavity. With the abovementioned method and microwave heating device of the invention, these factors can be taken into account.
  • a feed device is depicted in Fig. 1 which may advantageously be used in a microwave oven.
  • the microwaves generated by a magnetron (not depicted) are supplied to the feed device at an entry port 1 which is connected to a microwave distributor 2.
  • the microwave distributor in this example comprises a microwave distributor housing 3 and a microwave distributor means or member 4.
  • the microwave distributor means in this example is driven in a rotating movement by a drive device (not depicted).
  • the microwaves are subsequently conducted via waveguide 5 to the various feed points which are disposed in the walls of the cavity.
  • Figure 1 depicts four waveguides, each of which is disposed at right angles to the adjacent waveguides. This is clearly not obligatory, rather the feed device can be provided with an arbitrary number of waveguides which may assume any desired angle relative to each other and the microwave distributor.
  • the position of the microwave distributor means determines how large a fraction of the total amount of microwave power will be distributed to the respective waveguides. This is effected through the coupling factor between the respective waveguides and microwave distributor housing, which may equally be expressed between the respective feed points and the microwave distributor housing, being varied as a function of time as the microwave distributor means rotates.
  • the coupling factor may, for example, be expressed as a percentage of the total microwave power which is distributed to the respective waveguides or as a function of the phase difference resulting between the waveguides. This gives rise to the above described capability to control the microwave field in the cavity.
  • the microwave field obtained in the cavity is determined, inter alia, by how the distributor means rotates as a function of time.
  • the shape of the microwave distributer means or member may be executed in many different ways and is not limited to the depicted example.
  • FIG. 2 An alternative embodiment of the feeding device shown in Fig. 1 is depicted in Fig. 2.
  • the upper portion of the microwave distributor 2 is depicted separated from the microwave distributor for the sake of clarity.
  • the microwave distributor housing is provided with exit ports 6 which are disposed directly in front of the feed points disposed in a wall of the oven cavity (see below).
  • the microwave distributor in Fig. 2 fulfills the dual roles of distributing the microwaves and conducting them to the respective feed points.
  • the waveguides in Fig. 1 are not required and their function can be said to have been integrated in the microwave distributor.
  • Fig. 3 depicts an alternative embodiment of the feed device of the invention.
  • the microwave distributor means is constituted by a plate 7 which is secured to a pivotable axle 8.
  • the microwaves are supplied to the microwave distributor housing via the entry port 9, from which they are subsequently distributed to the waveguides 10 and the feed points in the cavity.
  • the plate can execute a movement between two end positions, so that the coupling factor between the respective waveguides and the microwave distributor housing may be varied in a corresponding fashion to that described above.
  • This movement may, for example, be provided by a motor 11 whose drive axle constitutes the axle 8.
  • Figs. 3a and 3b schematically depict a further development of the feed device of Fig. 3, respectively in a partial sectional view from the feeding side of the waveguide 10, and a partially sectional side view.
  • the waveguide 10 is provided with a feed portion 19 on which a magnetron 12 is secured for the supply of microwaves.
  • Located in the feed portion is a plate 7 which is pivotable on an axle 8, arranged in a fashion corresponding to Fig. 3, to distribute microwave power between upper and lower branches of the waveguide 10 which have respective exit ports 17, 18 intended to communicate with corresponding feed points in the cavity of a microwave oven.
  • the breadth of the waveguide branches expands in the direction towards the outlet ports 17, 18.
  • a vane 15 is located in the waveguide and is pivotable around an axle 16 disposed coplanar with, and transverse to, the axle 7. Rotating the vane 15 alters the effective breadth of the respective waveguide branch and thus their electrical length. Different electrical lengths give a corresonding phase difference between the microwaves which exit from exit ports 17, 18. This phase difference affects the microwave field distribution in the cavity which can thus be controlled by rotation of the vane, for example with a stepping motor in accordance with the control parameters.
  • the microwave distributor is partially integrated in the waveguide 10 itself by constituting the vane 15 secured therein, the feed portion 19 and the plate 7. In accordance with the invention, the microwave distributor means is driven in a controlled fashion.
  • parameter values which in turn determine the food preparation results for different types of food items.
  • These parameter values may, for example, be preparation time, power as a function of time and how the microwave distributor means should be driven (i.e. the position of the microwave distribution means as a function of time).
  • This drive information for the microwave distributor means may be specified as a time function and collected from a table stored in a memory.
  • the drive information may be obtained empirically by a testing process where the manufacturer of the microwave oven picks out the optimal parameter values for different preparation situations, these being then stored in the memory. In this fashion, the desired microwave field is subsequently provided.
  • the drive information may be generated during the heating procedure with sensors located in the cavity, the sensors measuring different physical quantities such as, for example, temperature and weight. These quantities are processed in a processor for conversion to suitable parameter values, which are then used to control the heating process as described above.
  • control may be provided by varying the speed of rotation during a revolution or by stepwise translating movements.
  • the plate 7 and vane 15 may be pivoted with a variable speed or stepwise.
  • a cavity to a microwave oven is schematically depicted in Fig. 4 and is provided with the feed device shown in Fig. 1.
  • the magnetron 12 generates microwaves and these are then distributed in the described manner to the waveguides.
  • the placement of the magnetron is clearly not limited to that shown in the figure, but can be disposed at a suitable place, as desired, a waveguide being disposed between the magnetron and the entry port 1 on the feed device.
  • the exit ports of the waveguides are located over feed points 13 in the roof of the cavity so that the microwave feed in this case is effected from four different feed points.
  • the microwave distributor means is driven by a drive device, schematically depicted here, such as an electric motor.
  • the motor is controlled by the drive information which is stored in the memory, as is described above.
  • a user of the oven may, for example, input information via a button panel (not depicted) which selects the relevant parameter values for the current processing procedure. If the microwave oven is equipped with sensors, the measurements of physical quantities from the sensors is used as in-signals to the processor, the measured values being converted to relevant parameter values and supplied to the motor as drive information.
  • Fig. 5 depicts a cavity to a microwave oven provided with the feed device shown in Fig. 3.
  • this embodiment may be dimensioned so that it functions as a resonant feed system in accordance with SE 9003012-3 which has been additionally fitted with a microwave distributor, as described above.
  • SE 9003012-3 which has been additionally fitted with a microwave distributor, as described above.
  • the feed system is depicted with a vertical placement on one of the side walls of the cavity.
  • the feed device can be located in any desired orientation on any of the walls of the cavity.
  • Figs. 6A-6D depict two examples of how a complete feed system can be constructed.
  • Fig. 6A depicts a feed device with three feed points. Feed points I2 and I3, if so desired, may be arranged so that they provide resonant input as described above, and the feed point I1 may be fitted with a stirrer.
  • the microwave distributor D is controlled during the processing procedure to distribute the energy between these feed points, whereby it is possible to select, to varying degrees, between resonant feed through feed points I2 and I3, and feed point I1.
  • Fig. 6B is, in principle, a feed device in accordance with Fig.
  • FIG. 6A where one feed point I2 is disposed on one of the side walls of the cavity and the second feed point I2 is disposed on the roof of the cavity, where a stirrer in front of the feed point can be arranged in a corresponding fashion as in Fig. 6A.
  • Figures 6C and 6D are simplified explanatory sketches of Fig. 6A and 6B respectively.
  • Figs. 7A-7C show three examples of how a microwave system may be configured.
  • Fig. 7A shows a microwave distributor D1 which has N individual waveguides which lead to N individual feed points I1,...,I N .
  • Figure 7B shows a configuration where N-1 individual microwave distributors D1,...,D N-1 effect feeding through N individual feed points.
  • Figure 7C is a further example where feeding is effected through N individual feed points.
  • the number of microwave distributors D1, D2,... with this configuration is given by the formula:

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
EP94105278A 1993-07-02 1994-04-05 Dispositif pour chauffage par micro-ondes Expired - Lifetime EP0632678B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9302302 1993-07-02
SE9302302A SE501494C2 (sv) 1993-07-02 1993-07-02 Förfarande för mikrovågsinmatning vid en mikrovågsvärmningsanordning samt mikrovågsvärmningsanordning

Publications (2)

Publication Number Publication Date
EP0632678A1 true EP0632678A1 (fr) 1995-01-04
EP0632678B1 EP0632678B1 (fr) 2002-07-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94105278A Expired - Lifetime EP0632678B1 (fr) 1993-07-02 1994-04-05 Dispositif pour chauffage par micro-ondes

Country Status (5)

Country Link
EP (1) EP0632678B1 (fr)
JP (1) JPH07147188A (fr)
KR (1) KR100369091B1 (fr)
DE (1) DE69430885T2 (fr)
SE (1) SE501494C2 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997019576A1 (fr) * 1995-11-17 1997-05-29 Gordon Thomas Andrews Appareil de cuisson a micro-ondes
FR2751055A1 (fr) * 1996-07-15 1998-01-16 Moulinex Sa Four electrique de cuisson
FR2753039A1 (fr) * 1996-08-31 1998-03-06 Daewoo Electronics Co Ltd Systeme de guide d'ondes pour four a micro-ondes
US5874706A (en) * 1996-09-26 1999-02-23 Tokyo Electron Limited Microwave plasma processing apparatus using a hybrid microwave having two different modes of oscillation or branched microwaves forming a concentric electric field
US6649890B1 (en) * 2002-11-20 2003-11-18 Maytag Corporation Microwave cooking appliance incorporating electric heating element
US6657171B1 (en) * 2002-11-20 2003-12-02 Maytag Corporation Toroidal waveguide for a microwave cooking appliance
US6667466B1 (en) * 2002-11-20 2003-12-23 Maytag Corporation Microwave delivery system for a cooking appliance
US6900424B2 (en) 2002-11-20 2005-05-31 Maytag Corporation Microwave delivery system for a cooking appliance
WO2008133810A1 (fr) * 2007-04-24 2008-11-06 Eastman Kodak Company Diviseur de puissance pour fixeur a micro-ondes
EP2499505B1 (fr) 2009-11-10 2017-08-23 Goji Limited Dispositif et procédé de régulation énergétique
WO2018093376A1 (fr) 2016-11-18 2018-05-24 Whirlpool Corporation Guide d'ondes de fours à micro-ondes à orifices d'alimentation multiples et système et procédé de commande de puissance rf associés

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100365589B1 (ko) * 1998-05-27 2003-04-10 삼성전자 주식회사 전자렌지
DE102012004204A1 (de) * 2012-03-01 2013-09-05 Topinox Sarl Gargerät und Verfahren zur Steuerung eines Gargeräts

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4140888A (en) * 1976-12-01 1979-02-20 Litton Systems, Inc. Dual-feed microwave oven
US4336434A (en) * 1980-08-15 1982-06-22 General Electric Company Microwave oven cavity excitation system employing circularly polarized beam steering for uniformity of energy distribution and improved impedance matching
DE3029035C2 (de) * 1980-07-31 1982-11-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Mikrowellenheizgerät
EP0344438A1 (fr) * 1988-05-31 1989-12-06 Bosch-Siemens HausgerÀ¤te GmbH Appareil domestique à micro-ondes
US5015813A (en) * 1988-12-14 1991-05-14 Mitsubishi Denki Kabushiki Kaisha Power feeding port arrangement for a microwave heating apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4140888A (en) * 1976-12-01 1979-02-20 Litton Systems, Inc. Dual-feed microwave oven
DE3029035C2 (de) * 1980-07-31 1982-11-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Mikrowellenheizgerät
US4336434A (en) * 1980-08-15 1982-06-22 General Electric Company Microwave oven cavity excitation system employing circularly polarized beam steering for uniformity of energy distribution and improved impedance matching
EP0344438A1 (fr) * 1988-05-31 1989-12-06 Bosch-Siemens HausgerÀ¤te GmbH Appareil domestique à micro-ondes
US5015813A (en) * 1988-12-14 1991-05-14 Mitsubishi Denki Kabushiki Kaisha Power feeding port arrangement for a microwave heating apparatus

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997019576A1 (fr) * 1995-11-17 1997-05-29 Gordon Thomas Andrews Appareil de cuisson a micro-ondes
FR2751055A1 (fr) * 1996-07-15 1998-01-16 Moulinex Sa Four electrique de cuisson
WO1998003041A1 (fr) * 1996-07-15 1998-01-22 Moulinex S.A. Four electrique de cuisson
US6057535A (en) * 1996-07-15 2000-05-02 Moulinex S.A. Electric cooking oven with improved energy distribution
FR2753039A1 (fr) * 1996-08-31 1998-03-06 Daewoo Electronics Co Ltd Systeme de guide d'ondes pour four a micro-ondes
US5874706A (en) * 1996-09-26 1999-02-23 Tokyo Electron Limited Microwave plasma processing apparatus using a hybrid microwave having two different modes of oscillation or branched microwaves forming a concentric electric field
US6649890B1 (en) * 2002-11-20 2003-11-18 Maytag Corporation Microwave cooking appliance incorporating electric heating element
US6657171B1 (en) * 2002-11-20 2003-12-02 Maytag Corporation Toroidal waveguide for a microwave cooking appliance
US6667466B1 (en) * 2002-11-20 2003-12-23 Maytag Corporation Microwave delivery system for a cooking appliance
US6900424B2 (en) 2002-11-20 2005-05-31 Maytag Corporation Microwave delivery system for a cooking appliance
WO2008133810A1 (fr) * 2007-04-24 2008-11-06 Eastman Kodak Company Diviseur de puissance pour fixeur a micro-ondes
US7515859B2 (en) 2007-04-24 2009-04-07 Eastman Kodak Company Power splitter for a microwave fuser of a reproduction apparatus
EP2499505B1 (fr) 2009-11-10 2017-08-23 Goji Limited Dispositif et procédé de régulation énergétique
US10999901B2 (en) 2009-11-10 2021-05-04 Goji Limited Device and method for controlling energy
EP2499505B2 (fr) † 2009-11-10 2021-05-05 Goji Limited Dispositif et procédé de régulation énergétique
WO2018093376A1 (fr) 2016-11-18 2018-05-24 Whirlpool Corporation Guide d'ondes de fours à micro-ondes à orifices d'alimentation multiples et système et procédé de commande de puissance rf associés
CN109417840A (zh) * 2016-11-18 2019-03-01 惠而浦有限公司 具有多个馈送端口的微波炉的波导的rf功率控制系统及其方法
EP3542594A4 (fr) * 2016-11-18 2020-07-22 Whirlpool Corporation Guide d'ondes de fours à micro-ondes à orifices d'alimentation multiples et système et procédé de commande de puissance rf associés
US11109454B2 (en) 2016-11-18 2021-08-31 Whirlpool Corporation Waveguide for microwave ovens with multiple feeding ports RF power control system and method thereof
CN109417840B (zh) * 2016-11-18 2022-04-08 惠而浦有限公司 具有多个馈送端口的微波炉的波导的rf功率控制系统及其方法

Also Published As

Publication number Publication date
KR950003707A (ko) 1995-02-17
DE69430885D1 (de) 2002-08-08
KR100369091B1 (ko) 2003-03-19
DE69430885T2 (de) 2003-01-30
SE501494C2 (sv) 1995-02-27
JPH07147188A (ja) 1995-06-06
EP0632678B1 (fr) 2002-07-03
SE9302302L (sv) 1995-01-03
SE9302302D0 (sv) 1993-07-02

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