EP0174732A1 - Four à micro-ondes - Google Patents

Four à micro-ondes Download PDF

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Publication number
EP0174732A1
EP0174732A1 EP85305591A EP85305591A EP0174732A1 EP 0174732 A1 EP0174732 A1 EP 0174732A1 EP 85305591 A EP85305591 A EP 85305591A EP 85305591 A EP85305591 A EP 85305591A EP 0174732 A1 EP0174732 A1 EP 0174732A1
Authority
EP
European Patent Office
Prior art keywords
cavity
tray
oven
microwave oven
power
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
EP85305591A
Other languages
German (de)
English (en)
Other versions
EP0174732B1 (fr
Inventor
Kenneth Ian Eke
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.)
Microwave Ovens Ltd
Original Assignee
Microwave Ovens Ltd
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 claimed from GB848420608A external-priority patent/GB8420608D0/en
Priority claimed from GB858513537A external-priority patent/GB8513537D0/en
Application filed by Microwave Ovens Ltd filed Critical Microwave Ovens Ltd
Publication of EP0174732A1 publication Critical patent/EP0174732A1/fr
Application granted granted Critical
Publication of EP0174732B1 publication Critical patent/EP0174732B1/fr
Expired 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
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6473—Aspects related to microwave heating combined with other heating techniques combined with convection heating
    • 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
    • H05B6/6408—Supports or covers specially adapted for use in microwave heating apparatus
    • H05B6/6411—Supports or covers specially adapted for use in microwave heating apparatus the supports being rotated

Definitions

  • This invention relates to a microwave oven with means for launching microwave power into a cavity of the oven from a launch area in the base of the cavity.
  • microwave power is transferred from a magnetron to the oven cavity in dependence upon the effectiveness of the coupling between the load of the oven cavity and the magnetron.
  • microwave ovens have been designed to achieve optimum coupling for a wide range of loads corresponding to differing sizes and densities of food items placed in the cavity.
  • This optimisation of coupling means that for a given input power to the magnetron the power into the cavity is optimised over the range of loads placed in the oven cavity.
  • the invention adopts an entirely different approach by aiming to provide a microwave oven having a cavity which, when devoid of food, is a poor power match with the magnetron, with the result that the amount of power transferred from the magnetron to the food being cooked is dependent almost entirely on the load of the food item.
  • a microwave oven has a power rating within the power limitations of a domestic plug/socket, the oven comprising a magnetron for producing microwave power into a cavity of the oven, means for launching the microwave power into the cavity from a launch area in the base of the cavity, and a metal tray supported in the cavity above the launch area with the peripheral edge of the tray spaced from the cavity walls so that the oven when devoid of food provides an inefficient power match with the magnetron, whereby the dielectric load of food items placed on the tray determines the power coupled to the loaded oven from the magnetron.
  • the amount of microwave power coupled into a loaded oven is substantially proportional to the dielectric load. The result of this is that the microwave oven need not have selectable microwave power settings which the user must first preset, because the load of the food item itself determines the amount of power delivered by the magnetron to the loaded cavity.
  • the tray may be circular and may form a rotatable turntable on which the food items are supported during cooking.
  • the turntable is preferably driven by a rotatable drive member extending upwardly through the base of the cavity, and this drive member may be arranged concentrically with a further drive member which rotates a mode stirrer in the base.
  • the positioning and size of the tray in the cavity are important factors in ensuring that the tray presents a load which is a poor match for the magnetron in terms of effectiveness of power transfer from the magnetron to the oven cavity.
  • the tray is between 18 and 25 mm (preferably about 20 mm) above the base, and is between 350 and 380 mm in diameter, preferably about 360 mm.
  • the tray will normally be made of sheet metal, which may be stove enamelled.
  • the oven preferably has thermal heating means in addition to the magnetron, the thermal heating means providing a forced flow of hot air through the cavity, as a result of air being blown over an electrical resistance heating element by means of a fan.
  • the air flow pattern is preferably such that hot air is forced into the cavity through an inlet in a rear wall of the cavity, and leaves the cavity through an outlet in the rear wall.
  • the back wall may have two inlets for the entry of forced hot air and two outlets for the exit of forced hot air.
  • the oven may be a small, portable microwave oven.
  • the oven is a small table top own powered from a domestic plug/socket.
  • the oven is generally rectangular in shape and the cavity is defined by two side walls 2, 4, a back wall 6, a top panel 8 and a base panel 10.
  • Microwave power is launched into the cavity through a rectangular aperture 12 in the base panel 10.
  • a mode stirrer (not shown) is mounted in the aperture 12 and is rotatably driven about a vertical axis.
  • the cavity accommodates a removable turntable in the form of a metal tray 14.
  • the tray 14 has a circular base 360 mm in diameter, surrounded by an upstanding wall or rim 25 mm high.
  • the tray 14 is formed of sheet metal which may be stove enamelled.
  • the cavity may have a height of 230 mm, a width of 400 mm and a depth of 390 mm.
  • the tray 14 is spaced 20 mm above the base panel 10, and the underside of the tray 14 is engaged by rollers 16 which are mounted on the base panel 10.
  • Drive means for rotating the turntable extend upwardly through the aperture 12 and are shown diagramatically at 18.
  • Such drive means are coaxially arranged with the drive to the mode stirrer, for example by the turntable being rotatably driven by a central vertical shaft surrounded by a drive sleeve driving the mode stirrer.
  • the drive shaft and drive sleeve are driven at their appropriate speeds, eg by belt drives from a motor. It will be appreciated that all this structure, together with a magnetron for delivering the microwave power, will be positioned below the cavity but within the oven outer casing which is not shown in the drawings.
  • FIG. 2 shows the hot air inlet and outlet in the back wall 6, as the latter is viewed from the front of the oven.
  • the back wall 6 has a vertically elongated inlet 20 through which hot air is forced by a fan to enter the cavity. Having passed over the food items, the air leaves the cavity through the circular air outlet 22. The air is then forced over an electric resistance heating element (disposed in a compartment behind the rear wall 6) before being recirculated through the inlet 20 and the cavity.
  • the turntable rotates about a central vertical axis, the underside of the tray 14 engaging the rollers 16.
  • the oven walls may be made of a single thickness of metal, so reducing construction costs and weight.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
EP19850305591 1984-08-14 1985-08-06 Four à micro-ondes Expired EP0174732B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB848420608A GB8420608D0 (en) 1984-08-14 1984-08-14 Microwave oven
GB8420608 1984-08-14
GB8513537 1985-05-29
GB858513537A GB8513537D0 (en) 1985-05-29 1985-05-29 Microwave oven

Publications (2)

Publication Number Publication Date
EP0174732A1 true EP0174732A1 (fr) 1986-03-19
EP0174732B1 EP0174732B1 (fr) 1989-11-08

Family

ID=26288117

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850305591 Expired EP0174732B1 (fr) 1984-08-14 1985-08-06 Four à micro-ondes

Country Status (2)

Country Link
EP (1) EP0174732B1 (fr)
DE (1) DE3574220D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2651303A1 (fr) * 1989-08-31 1991-03-01 Gold Star Co Four a micro-ondes avec une fonction de secheur de vaisselle et son procede de commande.
GB2329814A (en) * 1997-09-29 1999-03-31 Samsung Electronics Co Ltd Microwave oven with tray and mode stirrer driven by a single motor
US11412584B2 (en) 2017-12-08 2022-08-09 Alkar-Rapidpak, Inc. Ovens with metallic belts and microwave launch box assemblies for processing food products

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1086867A (en) * 1964-07-08 1967-10-11 Zd Y Elektrotepelnych Zarizeni Device for heating non-conducting substances, employing microwave energy
FR2310058A1 (fr) * 1975-04-30 1976-11-26 Matsushita Electric Ind Co Ltd Dispositif de chauffage a micro-ondes
EP0023827A1 (fr) * 1979-08-01 1981-02-11 Matsushita Electric Industrial Co., Ltd. Appareil de cuisson du type à circulation d'air chaud
GB2074310A (en) * 1980-04-22 1981-10-28 Sharp Kk Cooking ovens
EP0099705A2 (fr) * 1982-07-17 1984-02-01 Microwave Ovens Limited Fours à micro-ondes et méthodes de cuisson pour aliments

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1086867A (en) * 1964-07-08 1967-10-11 Zd Y Elektrotepelnych Zarizeni Device for heating non-conducting substances, employing microwave energy
FR2310058A1 (fr) * 1975-04-30 1976-11-26 Matsushita Electric Ind Co Ltd Dispositif de chauffage a micro-ondes
EP0023827A1 (fr) * 1979-08-01 1981-02-11 Matsushita Electric Industrial Co., Ltd. Appareil de cuisson du type à circulation d'air chaud
GB2074310A (en) * 1980-04-22 1981-10-28 Sharp Kk Cooking ovens
EP0099705A2 (fr) * 1982-07-17 1984-02-01 Microwave Ovens Limited Fours à micro-ondes et méthodes de cuisson pour aliments

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2651303A1 (fr) * 1989-08-31 1991-03-01 Gold Star Co Four a micro-ondes avec une fonction de secheur de vaisselle et son procede de commande.
GB2329814A (en) * 1997-09-29 1999-03-31 Samsung Electronics Co Ltd Microwave oven with tray and mode stirrer driven by a single motor
US11412584B2 (en) 2017-12-08 2022-08-09 Alkar-Rapidpak, Inc. Ovens with metallic belts and microwave launch box assemblies for processing food products
US11751296B2 (en) 2017-12-08 2023-09-05 Alkar-Rapidpak, Inc. Ovens with metallic belts and microwave launch box assemblies for processing food products

Also Published As

Publication number Publication date
EP0174732B1 (fr) 1989-11-08
DE3574220D1 (en) 1989-12-14

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