WO2018041567A1 - Four à micro-ondes ayant un agitateur de mode - Google Patents

Four à micro-ondes ayant un agitateur de mode Download PDF

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Publication number
WO2018041567A1
WO2018041567A1 PCT/EP2017/070195 EP2017070195W WO2018041567A1 WO 2018041567 A1 WO2018041567 A1 WO 2018041567A1 EP 2017070195 W EP2017070195 W EP 2017070195W WO 2018041567 A1 WO2018041567 A1 WO 2018041567A1
Authority
WO
WIPO (PCT)
Prior art keywords
edge
microwave oven
blade
cavity
slot
Prior art date
Application number
PCT/EP2017/070195
Other languages
English (en)
Inventor
Yasin Sedat Yirmili
Selim EKSIOGLU
Yalcin Yaman
Osman Eren OZDIL
Original Assignee
Arcelik Anonim Sirketi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Publication of WO2018041567A1 publication Critical patent/WO2018041567A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/72—Radiators or antennas
    • H05B6/725—Rotatable antennas

Definitions

  • the present invention relates to microwave ovens having mode stirrer, in particular to microwave ovens having mode stirrers of metallic blade structure, positioned behind a cavity.
  • a magnetron In ovens cooking directly by means of microwaves or those provided with microwave cooking facility, a magnetron is placed behind the cavity surrounding the cooking chamber, and the waves generated by the magnetron are fed to a wave guide and are transferred to the oven cavity through a wave guide opening.
  • Mode stirrers are used in order to create randomly distributed microwave zones in the cavity.
  • Mode stirrers modify the micro wave distribution in the cavity by way of modifying the entry point of micro wave energy into the cavity, modifying the effective shape of the cavity, or the oscillation frequency of the magnetron.
  • Patent publication no EP0151435 discloses a microwave oven comprising a cooking chamber, a microwave generator delivering the microwave energy to the cooking chamber by means of a wave guide arranged on it walls, a wave stirrer positioned on the orifice of said wave guide and a rotary shaft supporting a flange equipped with a set of metallic blades.
  • the shaft of the stirrer is mounted biased in vertical axis on the chamber wall.
  • the aim of the invention is to increase homogeneity of the electromagnetic wave distribution in the cooking chamber of an oven by means of a microwave mode stirrer.
  • the present invention is a microwave oven comprising a cavity defining a cooking chamber, and a mode stirrer having a metallic blade configured so as to propagate an electromagnetic wave scanning a cooking zone in the cavity by rotating substantially in parallel position to the cavity wall.
  • the blade comprises on its the periphery a curvilinear edge and a first lateral straight edge and a second lateral straight edge joining the curvilinear edge on its two mutual ends, and the blade has a dovetail shaped slot spaced with the curvilinear edge.
  • the dovetail shaped slot enables distribution of the electromagnetic waves propagating to the area scanned by the blade during rotation, so as to provide highly homogeneous cooking in the cooking zone.
  • the blade has a sheet structure with substantially quadrantal shape.
  • the sheet form allows producing the blade in a single piece, for example by cutting easily from a sheet plate.
  • the slot comprises a front corner form aligned so as to face the middle of the curvilinear edge.
  • the front corner facing the curvilinear edge allows decreasing the blade area so as to provide a compact structure.
  • the opening angle of the front corner is in the range of 90°-180°. In this case, it becomes possible to bring the slot having dovetail shape to the curvilinear edge so as to have a narrow and wide structure.
  • the electromagnetic waves are distributed in the cooking chamber so as to have minimal collision with each other thanks to the front corner having a wide angle.
  • the slot comprises a rear corner form arranged aligned with the front corner in the radial axis of the curvilinear edge, extending in parallel with the front corner.
  • the front and the rear corner being on the same axis generates electromagnetic waves propagating from the blade and entering the cooking chamber by being directed separately from each other. Electromagnetic waves having different entry direction helps the food products to interact with them at separate angles in the cooking chamber and to create a homogeneous cooking distribution.
  • a preferred embodiment of the invention comprises a rotation center passing through the front corner and the rear corner proximate to the ends of the first lateral straight edge and the second lateral straight edge joining each other.
  • the rotation center enables the curvilinear edge to scan a maximum area during rotation of the blade, and increases the influence area of the slot.
  • a preferred embodiment of the invention comprises a shaft being fixed to the rotation center, extending outwards perpendicularly to the blade. It becomes possible to continuously rotate the blade by means of an motor positioned on the blade and the shaft.
  • electromagnetic waves coming from for example a magnetron to the blade can be transmitted thanks to the shaft being made of a conductive material.
  • the slot comprises a first side edge and a second side edge extending in parallel with and corresponding spacedly to the first lateral straight edge and the second lateral straight edge.
  • the straight and parallel side edges of the slot help each side edge to act as an antenna.
  • Figure 1 is a frontal schematic view of the cavity and magnetron portions of a representative embodiment of the microwave cooker of the invention.
  • Figure 2 is a perspective view of a representative embodiment of a mode stirrer from the bottom propagating electromagnetic waves in connection with the magnetron.
  • Figure 3 is a perspective view from above of a blade provided in the mode stirrer of figure 2.
  • Figure 4 is an illustration of heat distribution of the cooking zone obtained by a mode stirrer without a slot.
  • Figure 5 is an illustration of heat distribution of a homogeneous cooking zone obtained by the microwave cooker of the invention.
  • Figure 1 is a representative frontal view of a cavity (1 ) of a domestic type microwave oven delimiting a cooking chamber, and a mode stirrer (10) connected thereon so as transmit electromagnetic waves.
  • the cavity (1 ) is of a metallic chamber structure whose front portion is closable with a hinged door (not shown).
  • the base of the cavity (1 ) defines an overall cooking zone (Z).
  • a metallic hollow magnetic protector (3) of frustoconical structure is adjacent to an upper wall of the cavity (1 ) at its wider base.
  • An opening (5) is formed on the upper wall of the magnetic protector (3).
  • a shaft (14) portion of the mode stirrer (10) can pass through the opening (5) in a rotatable manner.
  • a blade (20) of the mode stirrer (10) is fixed to the lower end of the shaft (14) so as to be in parallel and spaced with the upper wall.
  • the mode stirrer (10) is rotatably connected with an motor (4) at its upper portion, and with a magnetron (6) so as to conduct electromagnetic waves.
  • a housing (2) covers the upper portion of the magnetron (6), motor (4) and the mode stirrer (10), up to the magnetic protector (3).
  • FIG 2 shows a perspective view of the mode stirrer (10) from the bottom.
  • the mode stirrer (10) comprises a ceramic coupling arm (12) connected to the shaft (14) at its upper portion by means of a flange (13) which is an upper extension of the shaft (14).
  • the coupling arm (12) is mounted at its upper end (1 1 ) to the motor (4).
  • the blade (20) is attached to the lower end of the shaft (14) by means of a coupling screw (15) passing through the extension direction.
  • a slot (30) is opened on the blade (20).
  • FIG 3 shows a perspective view of the blade (20) from above.
  • the blade (20) has a substantially quadrantal outer periphery whose corners are rounded. To achieve this, the far ends of a first straight edge (24) and a second straight edge (25) extending at an angle of 90° to each other and forming a corner by joining from their ends, is joined with a curvilinear edge (22) shaped as a quadrantal bow.
  • the blade (20) is obtained by cutting an entirely planar flat metal sheet.
  • a rotation center (26) of an annular bore structure is formed on the blade (20) proximate to the corner portion where the first straight edge (24) and the second straight edge (25) join each other.
  • the coupling screw (15) attaches the blade (20) to the shaft (14) by passing through the rotation center (26).
  • the slot (30) is of dovetail shape having a structure extending to two sides in wide angle with respect to each other. To achieve this, the boundaries of the slot (30) form a front corner (33) proximate to the curvilinear edge (22), and a rear corner (38) in alignment with the front corner (33) with respect to the radial axis passing through the rotation center (26).
  • the front corner (33) is formed by connection of a first front edge (32) and a second front edge (34) extending near the curvilinear edge (22), from their ends.
  • the rear corner (38) is formed between a first rear edge (36) parallel spaced with the first front edge (32), and a second rear corner (37) parallel spaced with the second front edge (34).
  • the front corner (33) has a corner angle (a) of 120" facing the inner space of the slot (30).
  • the rear corner (38) scans an angle of 240° on its portion facing the slot (30).
  • the first front edge (32) and the first rear edge (36) have between their ends a first side edge (39) parallel to the second straight edge (25).
  • the second front edge (34) and the second rear edge (37) have between their ends a second side edge (35) parallel to the first straight edge (24).
  • FIG 4 a heat distribution illustration obtained with temperature variation values received by sensors placed on a cooking zone (Z) split into a matrix structure of 5x5, from a microwave oven in which microwave cooking is performed by using a mode stirrer (10) having a blade (20) without a slot (30) of the invention.
  • the below temperature values are obtained in the cooking tests performed with microwave cooking standards.
  • Table 1 Temperature variations obtained with a mode stirrer of predefined size, having blade without a slot.
  • the values of the above table are shown as heat distribution gradients in figure 4. As can be seen, heat distribution is not homogeneous according to the results of standard microwave cooking test.
  • the table below shows the results of the test performed with a mode stirrer (10) comprising the blade (20) having the slot (30) of the invention in equal test conditions. The result shows a remarkable homogeneous distribution.
  • a heat distribution gradient based on the values of table 2 is shown in figure 5.
  • the mode stirrer (10) of the invention is used on a single wall of the cavity (1 ) and in a single quantity, and a single mode stirrer (10) was sufficient to achieve desired homogeneous distribution values in domestic type cooking conditions, with a magnetron (6) for a domestic type oven capable of supplying power in the range of 90-900W.

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

Abstract

La présente invention concerne un four à micro-ondes comprenant une cavité (1) délimitant une chambre de cuisson, et un agitateur de mode (10) ayant une lame métallique (20) configurée de façon à propager une onde électromagnétique balayant une zone de cuisson (Z) dans la cavité (1) en tournant sensiblement en position parallèle à la paroi de la cavité (1).
PCT/EP2017/070195 2016-09-02 2017-08-09 Four à micro-ondes ayant un agitateur de mode WO2018041567A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2016/12497A TR201612497A1 (tr) 2016-09-02 2016-09-02 Mod kariştiriciya sahi̇p bi̇r mi̇krodalga firin
TRA2016/12497 2016-09-02

Publications (1)

Publication Number Publication Date
WO2018041567A1 true WO2018041567A1 (fr) 2018-03-08

Family

ID=59656041

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/070195 WO2018041567A1 (fr) 2016-09-02 2017-08-09 Four à micro-ondes ayant un agitateur de mode

Country Status (2)

Country Link
TR (1) TR201612497A1 (fr)
WO (1) WO2018041567A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0151435A2 (fr) 1984-01-26 1985-08-14 Moulinex S.A. Four à micro-ondes équipé d'un brasseur d'ondes
EP2393340A1 (fr) * 2010-06-04 2011-12-07 Whirlpool Corporation Appareil de chauffage par micro-ondes doté d'une antenne rotative et procédé correspondant
US20140197163A1 (en) * 2013-01-16 2014-07-17 Standex International Corporation Microwave mode stirrer apparatus
WO2016006249A1 (fr) * 2014-07-10 2016-01-14 パナソニックＩｐマネジメント株式会社 Dispositif de chauffage à micro-ondes
EP2988574A1 (fr) * 2013-04-19 2016-02-24 Panasonic Intellectual Property Management Co., Ltd. Dispositif chauffant à micro-ondes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0151435A2 (fr) 1984-01-26 1985-08-14 Moulinex S.A. Four à micro-ondes équipé d'un brasseur d'ondes
EP2393340A1 (fr) * 2010-06-04 2011-12-07 Whirlpool Corporation Appareil de chauffage par micro-ondes doté d'une antenne rotative et procédé correspondant
US20140197163A1 (en) * 2013-01-16 2014-07-17 Standex International Corporation Microwave mode stirrer apparatus
EP2988574A1 (fr) * 2013-04-19 2016-02-24 Panasonic Intellectual Property Management Co., Ltd. Dispositif chauffant à micro-ondes
WO2016006249A1 (fr) * 2014-07-10 2016-01-14 パナソニックＩｐマネジメント株式会社 Dispositif de chauffage à micro-ondes
US20170171922A1 (en) * 2014-07-10 2017-06-15 Panasonic Intellectual Property Management Co., Ltd. Microwave heating device

Also Published As

Publication number Publication date
TR201612497A1 (tr) 2018-03-21

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