US3106629A - Microwave heating apparatus - Google Patents

Microwave heating apparatus Download PDF

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Publication number
US3106629A
US3106629A US55960A US5596060A US3106629A US 3106629 A US3106629 A US 3106629A US 55960 A US55960 A US 55960A US 5596060 A US5596060 A US 5596060A US 3106629 A US3106629 A US 3106629A
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US
United States
Prior art keywords
energy
cavity
enclosure
microwave
coupling
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.)
Expired - Lifetime
Application number
US55960A
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English (en)
Inventor
Louis H Schall
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.)
Raytheon Co
Original Assignee
Raytheon Co
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
Priority to NL265624D priority Critical patent/NL265624A/xx
Application filed by Raytheon Co filed Critical Raytheon Co
Priority to US55960A priority patent/US3106629A/en
Priority to GB16904/61A priority patent/GB984424A/en
Priority to FR865467A priority patent/FR1292654A/fr
Priority to BE606716A priority patent/BE606716A/fr
Application granted granted Critical
Publication of US3106629A publication Critical patent/US3106629A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B6/745—Rotatable stirrers
    • 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
    • H05B6/6426—Aspects relating to the exterior of the microwave heating apparatus, e.g. metal casing, power cord

Definitions

  • high ⁇ frequency energy generally in the microwave region
  • the materials to be heated which may be ioodstuifs, Vor Vother industrial materials, are placed in an enclosure which is sealed 4to prevent the escape of the high frequency energy.
  • the energy which is generated by .a known high frequency energy source, such as a magnetron, .is inserted either directly into the enclosure or indirectly through the use of wave guides or other suitable devices.
  • the magnetron is generally located at the top of the enclosure. It is advantageous that the power supplies and other electr-ical or mechanical equipment utilized in the apparatus be located below the enclosure, or oven cavity. In conventional coniigurations jwherein the magnetron is placed at the top of the oven and the power supplies located below the enclosure, extensive cabling and relatively complicated construction design is required in order to transmit energy trom the power supply to the magnetron and thence into the oven. Alternatively, the magnetron may be placed below the roven cavity and the energy inserted through the bottom of the oven enclosure in order to avoid these construction diiliculties.
  • the enclosure comprises a first main cavity region wherein the material to be heated is plad and a second coupling cavity located substantially at the rear of the enclosure.
  • the microwave energy is inserted through the bottom wall of the enclosure into the rear coupling cavity.
  • the coupling cavity is separated from the main cavity region by ⁇ a partition which may be fabri cated partially from a metallic material and partially from a dielectric material.
  • the metallic portion of the partition is located substantially adjacent the energy source to prevent the energy liront the source from immediately being directed toward and, thereby, overcoupling the load.
  • the dielectric portion is located generally at a region above the material to be heated.
  • the rear -cavity has reflective surfaces that cause the energy to be deflected in a general upward direction where it is ultimately coupled from the rear cavity through the dielectric portion of the partition and, thence, downward over the load to be heated.
  • a suitable stirring device may be located in the coupling cavity so that the energy is uniformly distributed throughout the main oven area. Such a configuration assures a uniform distribution of energy throughout the load.
  • FIG. l - shows a sectional, elevation view of one embodiment of the invention.
  • FIG. 2 shows a top sectional view of the embodiment of the invention shown in FIG. 1 taken along the line 2-2
  • FIG. 3 shows a sectional, elevation view yof -a second embodiment of the invention.
  • FIG. 4 shows ya top sectional view ot' the embodiment of the invention shown in FIG. 3 taken .along the line 4 4.
  • a microwave heating apparatus 10 having a bottom section 11 and an upper section l2.
  • Bottom sect-ion '1l houses power supplies, cooling devices, and other electrical or mechanical equipment that may be required for operation.
  • Upper section 12 comprises a metallic enclosure into Ia portion of which the material to be heated is placed.
  • the upper section 12 comprises a iirst oven cavity l5 'and a second coupling cavity 14 separated by a partition 16 having a metallic portion 17 and a dielectric portion 11S.
  • Dielectric portion i8 is held at one end by a iirst bracket Sii attached to the upper end of metallic portion i7 and at the other end by a second bracket 31 attached at the front wall of upper section 12.
  • a door 13 s-lidably mounted to provide an laccess opening for placing a material 19 to be heated in oven cavity 15 as shown.
  • Material 1'9 is placed on a suitable dielectric platform 20 he-ld within cavity i5 by mounting brackets 21.
  • the door is arranged so that when it is closed it provides ,an adequate seal to prevent the escape of high frequency energy.
  • a microwave energy generator such as a magnetron 22, is mounted at the bottom wall 23 of coupling cavity 14, the latter cavity Ibeing located in this embodiment lat the rear of enclosure 12.
  • the magnetron may, for example, have a dome-shaped portion 24 which functions as an electromagnetic radiator of energy conducted thereto from the magnetron cavity resonator.
  • magnetrons as well as other types of magnetrons which are also adaptable lfor use with apparatus 1li, are well known in the art, tand, therefore, are not described in detail here.
  • Other means such as 'a waveguide, for coupling energy lthrough the bottom wall into the enclosure, may also be used.
  • Coupling cavi-ty 14, into which the energy is inserted, has a 'corner reflecting surface 26, placed substantially in the path of the enengy from source 22.
  • the enorgy is directed generally into the upper region 28 ⁇ of enclosure 161.
  • a mode stirring device -27 operated by a motor (not sho-wn) is mounted at the top wall of enclosure l0.
  • the dielectric portion y18 provides a means for preventing cooking igreases and vapors from entering coupling cavity 14 and spattering stirrer 27, magnetron 22 fand the reflecting walls of cavity 14. It is within the scope of the invention to remove the dielect-ric portion 18 ⁇ if cooking greases and vapors are not eX- pected to be a source of diiculty.
  • Coupling cavity i4 has dimensions which are relatively greater than the wave length of the high frequency energy source 22.
  • the basic excitation for the entering energy is the TMm mode but, because of the relatively large cavity size, substantially all modes are propagated within coupling cavity 14.
  • the structure of the invention allows optimum coupling and stirring characteristics to be obtained. These characteristics may be determined by the stirrer position and the height of metallic portion 17 of partition 16, the latter dimension being shown as the distance X in the ligure. By empirically adjusting dimension X and the stirrer position, a satisfactory impedence match and energy pattern can be obtained for a load placed within the main oven heating cavity 15.
  • FIGS. 3 and 4 A second embodiment of the invention is shown in FIGS. 3 and 4 wherein a microwave heating apparatus includes an oven enclosure 35 having a door 36, said enclosure resting on a structure 37 housing electrical and mechanical equipment including a power supply for a magnetron energy source 3S mounted at the bottom wall 39 at the rear of oven enclosure 35.
  • the dome-shaped radiator 4t) of magnetron 38 is inserted into a coupling cavity 41 formed by a rst slanted partition 42 on one side, the slanted rear Wall 43 of enclosure 3S, and portions of the side, top and bottom walls o the enclosure.
  • Partition 42 comprises a metallic portion 44 having an opening 45 therein.
  • Opening 45 is covered by a dielectric piece 4.6 and a mode stirrer 47 is mounted at the rear wall 43 within coupling cavity 41.
  • a load 4g to be heated is placed within main oven heating cavity 49.
  • Material 48 may be mounted on a dielectric platform 50 held by suitable brackets 51. For clarity the blades of mode stirrer 47 are not shown in FIG. 4.
  • FIGS. 3 and 4 thereby directs the energy from source 33 to load 48 through opening 45 so that the energy which is inserted at the bottom wall 39 of enclosure 35 is transmitted to the load from a point above the load to be heated.
  • the configuration of FIGS. 3 and 4 provides the advantages of bottom-feed with the advantages of coupling the bottom-fed energy to the load from a region above the load.
  • the invention need not be limited to the use of a single energy source inasmuch as a plurality of magnetrons, or other high frequency sources, may be used to provide energy to the coupling cavity for transmittal to the main oven cavity.
  • the coupling cavity need not be located at the rear of the enclosure but may extend along the side walls, for example.
  • Other suitable variations in the basic structure of the invention may be devised by those in the art and, hence, the invention is not to be limited to the particular embodiment disclosed herein except as defined by the appended claims.
  • a microwave heating apparatus comprising an enclosure having at least a bottom wall and having a material-receiving cavity therein, an energy coupling cavity in the enclosure extending at one side and above the material-receiving cavity, a partition separating said cavities, means for generating and radiating microwave energy through the bottom wall of said enclosure into said energy coupling cavity, said partition having a dielectric portion located above said material-receiving cavity to provide a transmission path for said microwave energy from said energy coupling cavity into said materialreceiving cavity whereby microwave energy is directed at material in said material-receiving cavity from a location above said material.
  • a microwave heating apparatus comprising: substantially rectangular shaped enclosure having a bottom wall, a top wall and a front, baci; and two side walls, an L-shaped partition extending from said front wall to said bottom wall and dening a material-receiving cavity and an energy coupling cavity, an access door on said iront wall to provide access to said material-receiving cavity, means for generating and radiating microwave energy through the bottom wall of said enclosure into said energy coupling cavity, said L-shaped partition having a dielectric portion located parallel to said bottom Wall to provide a transmission path for said microwave energy from said coupling cavity into said material-receiving cavity from a location above said material-receiving cavity, and stirrer means disposed in said energy coupling cavity directly above said dielectric portion for circulating said microwave energy in said energy coupling cavity down through said dielectric portion.
  • a microwave heating apparatus comprising: a substantially rectangular shaped enclosure having a bottom wall, a top wall and a front, back and two side walls, an L-shaped partition extending from said front wall to said bottom wall and deiining a material-receiving cavity and an energy coupling cavity, an access door on said front wall to provide access to said material-receiving cavity, means for generating and radiating microwave energy through the bottom wall of said enclosure into said energy coupling cavity, said L-shaped partition having a dielectric portion located parallel to said bottom wall to provide a transmission path for said microwave energy from said coupling cavity into said materialreceiving cavity from a location above said materialreceiving cavity, and stirrer means disposed in said energy coupling cavity directly above said dielectric portion for circulating said microwave energy in said energy coupling cavity down through said dielectric portion, and corner reflector means disposed in the corner formed by the intersection of said top wall and said back wall.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Constitution Of High-Frequency Heating (AREA)
US55960A 1960-09-14 1960-09-14 Microwave heating apparatus Expired - Lifetime US3106629A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL265624D NL265624A (enrdf_load_stackoverflow) 1960-09-14
US55960A US3106629A (en) 1960-09-14 1960-09-14 Microwave heating apparatus
GB16904/61A GB984424A (en) 1960-09-14 1961-05-09 Microwave heating apparatus
FR865467A FR1292654A (fr) 1960-09-14 1961-06-20 Appareil de chauffage à micro-ondes
BE606716A BE606716A (fr) 1960-09-14 1961-07-28 Appareil de chauffage à micro-ondes.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US55960A US3106629A (en) 1960-09-14 1960-09-14 Microwave heating apparatus

Publications (1)

Publication Number Publication Date
US3106629A true US3106629A (en) 1963-10-08

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ID=22001245

Family Applications (1)

Application Number Title Priority Date Filing Date
US55960A Expired - Lifetime US3106629A (en) 1960-09-14 1960-09-14 Microwave heating apparatus

Country Status (4)

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US (1) US3106629A (enrdf_load_stackoverflow)
BE (1) BE606716A (enrdf_load_stackoverflow)
GB (1) GB984424A (enrdf_load_stackoverflow)
NL (1) NL265624A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196243A (en) * 1963-02-26 1965-07-20 Raytheon Co High frequency heating system
US3261959A (en) * 1962-02-20 1966-07-19 F H Peavey & Company Apparatus for treatment of ore
US3505491A (en) * 1968-01-24 1970-04-07 Royden R Freeland Stirrer for microwave ovens
JPS4734260U (enrdf_load_stackoverflow) * 1971-05-10 1972-12-16
US3753651A (en) * 1970-08-27 1973-08-21 Wave Energy Systems Method and apparatus for surface sterilization
US4105886A (en) * 1976-07-06 1978-08-08 Litton Systems, Inc. Microwave energy feed system for combination cooking apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5564005U (enrdf_load_stackoverflow) 1978-10-25 1980-05-01
AU653291B2 (en) * 1992-06-01 1994-09-22 Matsushita Electric Industrial Co., Ltd. Heating cooking device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748239A (en) * 1952-09-05 1956-05-29 Gen Motors Corp Domestic appliance
US2813185A (en) * 1954-03-08 1957-11-12 Raytheon Mfg Co Heating devices

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748239A (en) * 1952-09-05 1956-05-29 Gen Motors Corp Domestic appliance
US2813185A (en) * 1954-03-08 1957-11-12 Raytheon Mfg Co Heating devices

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3261959A (en) * 1962-02-20 1966-07-19 F H Peavey & Company Apparatus for treatment of ore
US3196243A (en) * 1963-02-26 1965-07-20 Raytheon Co High frequency heating system
US3505491A (en) * 1968-01-24 1970-04-07 Royden R Freeland Stirrer for microwave ovens
US3753651A (en) * 1970-08-27 1973-08-21 Wave Energy Systems Method and apparatus for surface sterilization
JPS4734260U (enrdf_load_stackoverflow) * 1971-05-10 1972-12-16
US4105886A (en) * 1976-07-06 1978-08-08 Litton Systems, Inc. Microwave energy feed system for combination cooking apparatus

Also Published As

Publication number Publication date
NL265624A (enrdf_load_stackoverflow)
BE606716A (fr) 1961-11-16
GB984424A (en) 1965-02-24

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