US3436507A - Device for heating nonmetallic materials,more particularly food-stuffs,by microwave energy in a cavity resonator - Google Patents
Device for heating nonmetallic materials,more particularly food-stuffs,by microwave energy in a cavity resonator Download PDFInfo
- Publication number
- US3436507A US3436507A US556734A US3436507DA US3436507A US 3436507 A US3436507 A US 3436507A US 556734 A US556734 A US 556734A US 3436507D A US3436507D A US 3436507DA US 3436507 A US3436507 A US 3436507A
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- United States
- Prior art keywords
- heating
- cavity resonator
- microwave energy
- stuffs
- nonmetallic materials
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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
- H05B6/74—Mode transformers or mode stirrers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Constitution Of High-Frequency Heating (AREA)
Description
April 1, 1969 H. A. PUSCHNER 3,436,507
DEVICE FOR HEATING NONMETALLIC MATERIALS, MORE PARTICULARLY FOODSTUFF-S BY MICROWAVE ENERGY IN A CAVITY RESONATOR Filed June 10. 1966 9%WAM United States Patent US. Cl. 219-1055 5 Claims ABSTRACT OF THE DISCLOSURE A microwave oven is fed from the top through an input coupling system connecting the heating chamber with the microwave generator. A sealed stirrer is in the heating chamber supported for rotation coaxially to the input coupling system and has a primary radiator and an array of secondary radiators so that rotation of the stirrer keeps the field in the oven essentially uniform.
The invention relates to a device for heating nonmetallic materials, more particularly foodstufis, by microwave energy in a cavity resonator.
In such devices the cavity resonator serves as the heating chamber and a coupling system is provided which connects the heating chamber with the microwave generator, an oscillation-type converter being provided which rotates in the heating chamber. Hitherto, the converter has been provided apart from the coupling system, on the assumption that by this an especially uniform field distribution and uniform heating of the material would be achieved. Practice has shown however that with such an arrangement, undesirably high field strength differences occur in the heating chamber which cause nonuniform heating and necessitate correspondingly longer heating times in order to bring the entire material to the desired final temperature.
The present invention is based on the consideration that an arrangement of the converter apart from the coupling system results in an operative mechanism which is difiicult to supervise and is independent of the otherwise usual geometric relationships. Starting from this consideration, in a device constructed according to the invention, the converter is arranged to rotate coaxially to the input coupling system. As a result of this, by suitably distributing the secondary radiators of the oscillation-type converter relative to the coupling system, it is possible to produce a desired field distribution and to achieve excitation of only such oscillation modes which result in superimpositions of the desired field distribution in the chamber.
A particularly advantageous utilisation of the coaxial arrangement of the input coupling system and oscillationtype converter is achieved if the wave coming from the coaxial input is coupled to the oscillation-type converter through a coaxial conical transition. The oscillation-type converter can consist of a number of secondary radiators and the polarisation of the secondary radiators can be distributed over all three space coordinates of the cavity resonator. I 1
3,436,507 Patented Apr. 1, 1969 In order to make the invention clearly understood, reference will now be made to the accompanying diagrammatic drawings which are given by way of example and in which:
FIG. 1 illustrates a cavity resonator with an input coupling system and an oscillation-type converter; and
FIG. 2 is a plan view of FIG. 1.
The illustrated device comprises a heating chamber 1 in which foodstuff to be heated can be placed. The heating chamber has a door 2 at its front side.
The heating chamber 1 is formed as a cavity resonator for the microwave energy which is used, and for this purpose is provided with a wall 2 which consists of metal or which is provided with a metallic cladding. In the centre of the top, as an input coupling system, a coaxial line with an outer conductor 4 and an inner conductor 5 is provided. In the chamber 1, a conical transition 6 of metal is connected to the inner conductor 5, its base surface carrying a circular plate 7 with a plurality of secondary radiators '8 which are in the form of narrow metal strips. The plate 7 which consists of nonmetallic material, with the metal transition cone 6 connected to the inner conductor 5, serves as an oscillation-type converter and is arranged for rotation.
I claim:
1. A device for heating nonmetallic materials, such as foodstuffs, by microwave energy, comprising a cavity resonator serving as a heating chamber, a microwave generator, an input coupling system connecting the heating chamber with the microwave generator, and field stirring means rotatably disposed in the heating chamber, means for supporting said field stirring means for rotation coaxially to the said input coupling system, said field stirring means including a primary radiator and an array of secondary radiators.
2. A device according to claim 1, wherein said primary radiator includes a conical transition member disposed coaxially to the input coupling system and arranged for coupling a wave from the input coupling system to said primary and secondary radiators.
3. A device according to claim 1, wherein the secondary radiators are carried by a nonmetallic and circular plate carried by said conical transmission memher.
4. A device according to claim 1, wherein the polarisation of the secondary radiators is distributed over all three space coordinates of the cavity resonator.
5. A device according to claim 3, wherein the secondary radiators are in the form of narrow metal strips.
References Cited UNITED STATES PATENTS 2,748,239 5/1956 Long et a1 219-10.55 2,961,520 11/1960 Long 219--10.55 3,364,332 1/1968 Sven-Olov Reftmark FOREIGN PATENTS 1,482,777 5/1967 France.
RICHARD M. WOOD, Primary Examiner. L. H. BENDER, Assistant Examiner.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA0049462 | 1965-06-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3436507A true US3436507A (en) | 1969-04-01 |
Family
ID=6936886
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US556734A Expired - Lifetime US3436507A (en) | 1965-06-12 | 1966-06-10 | Device for heating nonmetallic materials,more particularly food-stuffs,by microwave energy in a cavity resonator |
Country Status (7)
Country | Link |
---|---|
US (1) | US3436507A (en) |
AT (1) | AT270021B (en) |
CH (1) | CH455975A (en) |
DE (1) | DE1565261C3 (en) |
GB (1) | GB1128387A (en) |
NL (2) | NL6607728A (en) |
SE (1) | SE324625B (en) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3643055A (en) * | 1969-12-01 | 1972-02-15 | Matsushita Electric Ind Co Ltd | High-frequency heating apparatus |
DE2622173A1 (en) * | 1975-05-19 | 1976-12-02 | Matsushita Electric Ind Co Ltd | DEVICE FOR HEATING AN OBJECT WITH HIGH FREQUENCY RADIATION, IN PARTICULAR MICROWAVE OVEN |
DE2844128A1 (en) | 1977-10-14 | 1979-04-19 | Bosch Siemens Hausgeraete | MICROWAVE OVEN |
US4176266A (en) * | 1976-02-02 | 1979-11-27 | Hitachi, Ltd. | Microwave heating apparatus |
US4185182A (en) * | 1978-07-03 | 1980-01-22 | Armstrong Cork Company | Microwave oven apparatus |
FR2443025A1 (en) * | 1978-12-01 | 1980-06-27 | Raytheon Co | MICROWAVE OVEN WITH ROTATING RADIANT ELEMENTS |
US4284868A (en) * | 1978-12-21 | 1981-08-18 | Amana Refrigeration, Inc. | Microwave oven |
US4335289A (en) * | 1978-12-21 | 1982-06-15 | Amana Refrigeration, Inc. | Microwave oven |
DE2857841C1 (en) * | 1977-10-14 | 1982-07-15 | Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart | Microwave oven |
US4358653A (en) * | 1977-11-25 | 1982-11-09 | Raytheon Company | Combination microwave oven |
US4410779A (en) * | 1978-04-03 | 1983-10-18 | Raytheon Company | Combination microwave oven control system |
US4414453A (en) * | 1978-12-21 | 1983-11-08 | Raytheon Company | Microwave oven feed apparatus |
US4421968A (en) * | 1978-12-01 | 1983-12-20 | Raytheon Company | Microwave oven having rotating conductive radiators |
US4430538A (en) | 1980-08-28 | 1984-02-07 | Tokyo Shibaura Denki Kabushiki Kaisha | High-frequency heating device |
US4431888A (en) * | 1978-12-21 | 1984-02-14 | Amana Refrigeration, Inc. | Microwave oven with improved feed structure |
US4463239A (en) * | 1982-12-06 | 1984-07-31 | General Electric Company | Rotating slot antenna arrangement for microwave oven |
US4629849A (en) * | 1984-06-28 | 1986-12-16 | Ngk Insulators Ltd. | Microwave heating device having a rotary reflector means in a heating chamber |
US5438183A (en) * | 1993-06-30 | 1995-08-01 | Sanyo Electric Co., Ltd. | Microwave oven including antenna for radiating microwave |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1125378A (en) * | 1978-04-03 | 1982-06-08 | Bernard J. Weiss | Combination microwave oven control system |
SE416696B (en) * | 1979-03-19 | 1981-01-26 | Philips Svenska Ab | MICROWAG OVEN DEVICES FOR ENERGY INPUT |
KR890001581Y1 (en) * | 1986-07-21 | 1989-04-06 | 삼성전자주식회사 | Electronic range |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2748239A (en) * | 1952-09-05 | 1956-05-29 | Gen Motors Corp | Domestic appliance |
US2961520A (en) * | 1957-04-02 | 1960-11-22 | Gen Motors Corp | Domestic appliance |
FR1482777A (en) * | 1965-06-12 | 1967-05-26 | Atlas Werke Gmbh | Apparatus for heating non-metallic materials, in particular foodstuffs, by means of microwave energy |
US3364332A (en) * | 1964-03-20 | 1968-01-16 | Philips Corp | Arrangement in microwave stoves |
-
0
- NL NL136572D patent/NL136572C/xx active
-
1965
- 1965-06-12 DE DE1565261A patent/DE1565261C3/en not_active Expired
-
1966
- 1966-05-31 AT AT514266A patent/AT270021B/en active
- 1966-06-02 CH CH802066A patent/CH455975A/en unknown
- 1966-06-03 NL NL6607728A patent/NL6607728A/xx unknown
- 1966-06-10 US US556734A patent/US3436507A/en not_active Expired - Lifetime
- 1966-06-10 SE SE7958/66A patent/SE324625B/xx unknown
- 1966-06-13 GB GB26289/66A patent/GB1128387A/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2748239A (en) * | 1952-09-05 | 1956-05-29 | Gen Motors Corp | Domestic appliance |
US2961520A (en) * | 1957-04-02 | 1960-11-22 | Gen Motors Corp | Domestic appliance |
US3364332A (en) * | 1964-03-20 | 1968-01-16 | Philips Corp | Arrangement in microwave stoves |
FR1482777A (en) * | 1965-06-12 | 1967-05-26 | Atlas Werke Gmbh | Apparatus for heating non-metallic materials, in particular foodstuffs, by means of microwave energy |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3643055A (en) * | 1969-12-01 | 1972-02-15 | Matsushita Electric Ind Co Ltd | High-frequency heating apparatus |
DE2622173A1 (en) * | 1975-05-19 | 1976-12-02 | Matsushita Electric Ind Co Ltd | DEVICE FOR HEATING AN OBJECT WITH HIGH FREQUENCY RADIATION, IN PARTICULAR MICROWAVE OVEN |
US4476362A (en) * | 1975-05-19 | 1984-10-09 | Matsushita Electric Industrial Co., Ltd. | High frequency heating apparatus |
US4176266A (en) * | 1976-02-02 | 1979-11-27 | Hitachi, Ltd. | Microwave heating apparatus |
DE2844128A1 (en) | 1977-10-14 | 1979-04-19 | Bosch Siemens Hausgeraete | MICROWAVE OVEN |
DE2857841C1 (en) * | 1977-10-14 | 1982-07-15 | Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart | Microwave oven |
US4358653A (en) * | 1977-11-25 | 1982-11-09 | Raytheon Company | Combination microwave oven |
US4410779A (en) * | 1978-04-03 | 1983-10-18 | Raytheon Company | Combination microwave oven control system |
US4185182A (en) * | 1978-07-03 | 1980-01-22 | Armstrong Cork Company | Microwave oven apparatus |
FR2443025A1 (en) * | 1978-12-01 | 1980-06-27 | Raytheon Co | MICROWAVE OVEN WITH ROTATING RADIANT ELEMENTS |
US4421968A (en) * | 1978-12-01 | 1983-12-20 | Raytheon Company | Microwave oven having rotating conductive radiators |
US4335289A (en) * | 1978-12-21 | 1982-06-15 | Amana Refrigeration, Inc. | Microwave oven |
US4414453A (en) * | 1978-12-21 | 1983-11-08 | Raytheon Company | Microwave oven feed apparatus |
US4431888A (en) * | 1978-12-21 | 1984-02-14 | Amana Refrigeration, Inc. | Microwave oven with improved feed structure |
US4284868A (en) * | 1978-12-21 | 1981-08-18 | Amana Refrigeration, Inc. | Microwave oven |
US4430538A (en) | 1980-08-28 | 1984-02-07 | Tokyo Shibaura Denki Kabushiki Kaisha | High-frequency heating device |
US4463239A (en) * | 1982-12-06 | 1984-07-31 | General Electric Company | Rotating slot antenna arrangement for microwave oven |
US4629849A (en) * | 1984-06-28 | 1986-12-16 | Ngk Insulators Ltd. | Microwave heating device having a rotary reflector means in a heating chamber |
US5438183A (en) * | 1993-06-30 | 1995-08-01 | Sanyo Electric Co., Ltd. | Microwave oven including antenna for radiating microwave |
AU666616B2 (en) * | 1993-06-30 | 1996-02-15 | Sanyo Electric Co., Ltd. | Microwave oven including antenna for radiating microwave |
Also Published As
Publication number | Publication date |
---|---|
DE1565261C3 (en) | 1974-01-24 |
NL136572C (en) | |
NL6607728A (en) | 1966-12-13 |
GB1128387A (en) | 1968-09-25 |
DE1565261A1 (en) | 1970-02-05 |
SE324625B (en) | 1970-06-08 |
DE1565261B2 (en) | 1973-06-28 |
CH455975A (en) | 1968-05-15 |
AT270021B (en) | 1969-04-10 |
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