WO2013021369A2 - Four à micro-ondes - Google Patents

Four à micro-ondes Download PDF

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Publication number
WO2013021369A2
WO2013021369A2 PCT/IB2012/057283 IB2012057283W WO2013021369A2 WO 2013021369 A2 WO2013021369 A2 WO 2013021369A2 IB 2012057283 W IB2012057283 W IB 2012057283W WO 2013021369 A2 WO2013021369 A2 WO 2013021369A2
Authority
WO
WIPO (PCT)
Prior art keywords
microwave oven
chamber
radiator
magnetron
power output
Prior art date
Application number
PCT/IB2012/057283
Other languages
English (en)
Other versions
WO2013021369A3 (fr
Inventor
Valerii Stepanovich ZHYLKOV
Original Assignee
Zhylkov Valerii Stepanovich
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 Zhylkov Valerii Stepanovich filed Critical Zhylkov Valerii Stepanovich
Priority to PCT/IB2012/057283 priority Critical patent/WO2013021369A2/fr
Publication of WO2013021369A2 publication Critical patent/WO2013021369A2/fr
Publication of WO2013021369A3 publication Critical patent/WO2013021369A3/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

Definitions

  • the present invention relates to electric heaters which employ microwave radiation energy and may be preferably practiced for a heat treatment of foodstuffs.
  • a device to supply microwave energy which is generated by a magnetron into a microwave oven chamber which device comprises a shortened pyramidal horn antenna connected through a communication opening in a wall of a processing chamber which has a rectangular shape.
  • uch devices are used in substantially all of the microwave oven models commercially available from Samsung Electronics, LG, and a number of other companies).
  • the main disadvantages of such a device include a nonuniform distribution of microwave field energy within the chamber cavity; the dependence of said distribution and oven operation efficiency on the volume, weight, and position in the chamber of a product processed this resulting in a nonuniform heating and a poor cooking of meals as well as in an increase in electricity consumption.
  • the coefficient of uniformity of heating sources distribution ⁇ is between 38 % and 40 % if no rotation and 64 % if a product processed is rotated on a dielectric platform (measured as specified in [7]).
  • the efficiency of power transfer from the magnetron to the processing chamber is reduced by (18 ⁇ 20) % due to both ohmic and reactive losses in a multilink transfer circuit.
  • the most similar to the microwave oven in accordance with the present invention are a microwave oven having a diagonal excitation of a circularly polarized electromagnetic field in the processing chamber [2] and a process installation which includes a resonance chamber for heating provided with a device to supply a magnetron power into a processing chamber through a reentrant rectangular resonator.
  • the power output of the magnetron is submerged into this resonator and an exiting stripline antenna of the resonance chamber for heating is connected using a coaxial to waveguide adapter [3].
  • the stripline antenna which excites the circularly polarized electromagnetic field in the processing chamber and forms a uniform distribution of microwave heating sources ( ⁇ >90%) in the equivalent load is the principal element [2, 3].
  • a two-element stripline antenna is composed of a radiator which has the shape of a “compressed figure eight” and is made of a high-conductivity metal sheet and a quasi-ellipsoidal screen also made of a high-conductivity metal sheet and secured rigidly physically through an opening at the center while providing a galvanic contact at an outer conductor of a coaxial length of a coaxial to waveguide adapter (CWA) each of the branches of the “figure-eight” radiator being connected, to ensure an in-phase feeding, physically and galvanically to the screen in characteristic points by means of bushes of a high-conductivity metal and the center of symmetry of the “figure eight” being connected to the center conductor of a coaxial length of CWA to the waveguide input of which energy from a microwave generator, magnetron, is applied.
  • CWA coaxial to waveguide adapter
  • the main disadvantages of the above devices include noticeable ohmic and reactive losses (10 to 12 %) of microwave energy in a multilink power transfer circuit from the magnetron to the microwave oven chamber; the complexity of matching individually the impedance of the stripline antenna impedance with that of the heating chamber (the resonator with a load) this resulting in an increase in efforts when designing microwave ovens with various dimensions of heating chambers; a low processability level of the stripline antenna design this being a material aspect when putting an article into production.
  • the device disclosed in [3] is used as an electromagnetic field exciter in resonance chambers for heating of process installations.
  • a microwave oven comprising: a chamber, a magnetron disposed outside the chamber whose power output is connected to a stripline antenna which is disposed inside the chamber and includes a radiator and a screen.
  • the radiator of the stripline antenna having an opening in which a metal sleeve is installed with the magnetron power output being located therein, the magnetron power output being located within the chamber.
  • microwave oven means both household and commercial microwave ovens which utilize microwave heating energy.
  • the radiator is connected physically and electrically to the screen by means of a set of metal bushes with the aid whereof the stripline antenna is also tuned with the resonance processing chamber of the microwave oven.
  • tuning results in matching the stripline antenna input with the magnetron power output, matching the antenna impedance with the heating chamber impedance, this in turn making it possible to achieve a substantial reduction in energy losses during energy channeling from the magnetron to the heating chamber as well as a highly uniform distribution of microwave heating sources in a load of the chamber.
  • At least a part of the wall of the microwave oven chamber constitutes the screen. This simplifies the device design and makes it cheaper.
  • the design in accordance with the present invention is characterized by a high processability at significantly lower manufacturing costs.
  • the microwave oven in accordance with the present invention is characterized by that the metal sleeve with the magnetron power output being located therein is installed in the opening of the radiator of the stripline antenna in an undetachable manner.
  • this connection may be made by welding.
  • the radiator of the stripline antenna is made in the form of a quasi-ellipsoidal disk of ⁇ long and ⁇ /2 wide where ⁇ is the free space wavelength.
  • the diameter of the opening of the radiator of the stripline antenna is equal to that of the magnetron power output, the diameter of the magnetron power output being equal to the inner diameter of the metal sleeve in which said output is disposed.
  • Fig. 1 is a schematic of a microwave oven in accordance with the present invention
  • Fig. 2 is a cross sectional view of a magnetron and a stripline antenna installed within the microwave oven chamber of Fig. 1;
  • Fig. 3 is a general view of a radiator of the stripline antenna of Fig. 2.
  • Fig. 1 is a schematic of a microwave oven which shows an oven housing 1 formed by walls, an oven processing chamber 2, a door 3, and opening 4 in the wall of the microwave oven chamber.
  • Fig. 2 is a cross sectional view of a magnetron and a stripline antenna installed within the chamber of the microwave oven showing a magnetron 5, a magnetron flange 6, the stripline antenna which consists of a radiator 7 and a screen 8 which comprises at least a part of the wall of the microwave oven chamber. Also, this figure shows metal bushes 9, screws 10 which connect the radiator 7 to the metal bushes 9, a metal sleeve 11, a ceramic enclosure 12.
  • Fig. 3 is a general view of radiator 7 of the stripline antenna of the microwave oven in accordance with the present invention.
  • the radiator 7 has an opening 13 formed therein for the installation of the metal sleeve 11 as well as openings 14, 15, 16 formed therein for connecting the radiator 7 and the metal bushes 9 to the chamber sidewall with screws 10.
  • the design of the microwave oven in accordance with the present invention is characterized by the standard set of basic components, namely: the oven housing 1 formed by the walls, the oven processing chamber 2, the door 3, and the controls (not shown) which are assembled in a conventional sequence and may be selected from the set of commercially available structural components.
  • the features of the device in accordance with the present invention in assembling are as follows. Three matching elements comprising the metal bushes 9 made of a high-conductivity metal are installed physically which ensuring a galvanic contact at the inner surface of the chamber 2 sidewall and are fixed with the screws 10. The magnetron 5 is then installed, the power output whereof being placed into the cavity of the oven processing chamber of the microwave oven through the opening 4 in the microwave oven wall. Thereafter, the radiator 7 is mounted: the radiator 7 is fastened to the metal bushes 9 through the respective opening 14, 15, 16 with the screws 10 and the metal sleeve 11 which has a collet connector (not shown in Fig. 2) is connected to the ceramic enclosure 12 of the magnetron power output 5. The metal sleeve 11 is disposed in the opening 13 of the radiator 7 and is secured thereto in an undetachable manner.
  • the assemblies and elements of the microwave oven in accordance with the present invention have a relatively simple design; their manufacture is widely established and does not require complex manufacturing equipment.
  • the optimal dimensions of the metal bushes 9 (diameter of 10 mm, length of 26 mm) as well as the location coordinates of the openings 14, 15, 16 of their connection to the radiator 7, respectively, a point 14 (-30, 12), a point 15 (40, 15), a point 16 (36, -22) (Fig. 3).
  • the two-element stripline antenna with the quasi-ellipsoidal radiator in the form of the thin disk 7 of ⁇ long, ⁇ /2 wide, and 1 mm thick was matched, in the free space radiation mode, to the voltage standing wave ratio (VSWR) of the input of 1.2 within a frequency band of between 2.4 GHz and 2.5 GHz and to VSWR of the input of 1.52 when installed within the chamber cavity of the microwave oven with the equipment cartridge load in accordance with [7].
  • VSWR voltage standing wave ratio
  • the coordinates of the antenna phase center coincide with those of the center of symmetry of the top wall surface of the processing chamber 2 of the microwave oven in accordance with the present invention.
  • the position of the radiator 7 in which the angle between its principal axis of symmetry and the horizontal axis of symmetry of the processing chamber 2 sidewall is ⁇ 6° corresponds to the optimal mode of operation of the device.
  • the coefficient of uniformity of microwave heating sources distribution ⁇ 94% was determined as well as the losses of microwave energy during its transfer from the magnetron to the microwave oven chamber were measured which losses were 4%.
  • a microwave oven which, thanks to its optimal configuration conditional upon the set of structural components and their interconnection to each other, makes it possible to ensure an increase in the efficiency of microwave energy transfer from the magnetron of the microwave oven to the processing chamber where heating occurs; the achievement of a highly uniform distribution of microwave field energy within the processing chamber cavity of the microwave oven; and the achievement of such a design processability level that meets the requirements for the organization of full-scale production as well as has the prospects of commercial applications.

Landscapes

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

Abstract

La présente invention concerne des dispositifs de chauffe électriques qui utilisent de l'énergie sous forme de rayonnement micro-onde et peuvent être de préférence utilisés pour chauffer des produits alimentaires. L'invention concerne un four à micro-ondes comprenant une chambre, un magnétron situé à l'extérieur de la chambre et dont la sortie de puissance est connectée à une antenne à ligne triplaque qui est agencée à l'intérieur de la chambre et qui comprend un radiateur et un écran, le radiateur de l'antenne à ligne triplaque présentant une ouverture dans laquelle un manchon métallique est monté, la sortie de puissance du magnétron étant située dans ledit manchon, à l'intérieur de ladite chambre.
PCT/IB2012/057283 2012-12-13 2012-12-13 Four à micro-ondes WO2013021369A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2012/057283 WO2013021369A2 (fr) 2012-12-13 2012-12-13 Four à micro-ondes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2012/057283 WO2013021369A2 (fr) 2012-12-13 2012-12-13 Four à micro-ondes

Publications (2)

Publication Number Publication Date
WO2013021369A2 true WO2013021369A2 (fr) 2013-02-14
WO2013021369A3 WO2013021369A3 (fr) 2013-12-27

Family

ID=47669028

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2012/057283 WO2013021369A2 (fr) 2012-12-13 2012-12-13 Four à micro-ondes

Country Status (1)

Country Link
WO (1) WO2013021369A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017035604A1 (fr) * 2015-09-03 2017-03-09 Commonwealth Scientific And Industrial Research Organisation Appareil de chauffage par micro-onde et procédé de chauffage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1083772A1 (fr) * 1999-09-10 2001-03-14 Brandt Cooking Antenne pour four à micro-ondes
RU2327305C2 (ru) * 2005-09-26 2008-06-20 Zhilkov Valerij Stepanovich Устройство для возбуждения кругополяризованного поля в камере микроволновой печи
US20100126987A1 (en) * 2008-11-25 2010-05-27 Zhylkov Valerie S Device for transfer of microwave energy into a defined volume
RU2393650C2 (ru) * 2008-09-22 2010-06-27 Валерий Степанович Жилков Микроволновая печь

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1083772A1 (fr) * 1999-09-10 2001-03-14 Brandt Cooking Antenne pour four à micro-ondes
RU2327305C2 (ru) * 2005-09-26 2008-06-20 Zhilkov Valerij Stepanovich Устройство для возбуждения кругополяризованного поля в камере микроволновой печи
RU2393650C2 (ru) * 2008-09-22 2010-06-27 Валерий Степанович Жилков Микроволновая печь
US20100126987A1 (en) * 2008-11-25 2010-05-27 Zhylkov Valerie S Device for transfer of microwave energy into a defined volume

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017035604A1 (fr) * 2015-09-03 2017-03-09 Commonwealth Scientific And Industrial Research Organisation Appareil de chauffage par micro-onde et procédé de chauffage

Also Published As

Publication number Publication date
WO2013021369A3 (fr) 2013-12-27

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