EP1113707A2 - Heizungsvorrichtung für Mikrowellenofen - Google Patents

Heizungsvorrichtung für Mikrowellenofen Download PDF

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Publication number
EP1113707A2
EP1113707A2 EP00121054A EP00121054A EP1113707A2 EP 1113707 A2 EP1113707 A2 EP 1113707A2 EP 00121054 A EP00121054 A EP 00121054A EP 00121054 A EP00121054 A EP 00121054A EP 1113707 A2 EP1113707 A2 EP 1113707A2
Authority
EP
European Patent Office
Prior art keywords
heater
heat
food
microwave oven
reflecting plate
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.)
Withdrawn
Application number
EP00121054A
Other languages
English (en)
French (fr)
Other versions
EP1113707A3 (de
Inventor
Jong-Woog Lee
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP1113707A2 publication Critical patent/EP1113707A2/de
Publication of EP1113707A3 publication Critical patent/EP1113707A3/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/02—Stoves or ranges heated by electric energy using microwaves
    • 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
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • H05B6/766—Microwave radiation screens for windows
    • 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
    • H05B6/6402—Aspects relating to the microwave cavity

Definitions

  • the present invention relates generally to microwave ovens, and more particularly to a heating device for microwave ovens, which generates heat by a heater and deflects improperly directed heat by heat reflecting means.
  • a general microwave oven cooks food by heating the food positioned in its cavity using microwaves generated by the oscillations of its magnetron.
  • the heater is generally fixed at a specific position in the cavity of the microwave oven, such as the upper or lower portion of the cavity, so that the heater is operated at a specific position regardless of the quantity or volume of the food. Accordingly, the heater is not utilized optimally and the food is not cooked sufficiently and uniformly.
  • a moving heater type microwave oven In order to overcome the shortcomings of the stationary heater type microwave oven, a moving heater type microwave oven has been proposed.
  • the moving heater type microwave oven its moving heater is rotated within a certain rotation angle according to the quantity or volume of food, so that the heater is caused to generate heat near food. Accordingly, the microwave oven is provided with the moving heater, so that the heater is capable of approaching the food and applying uniform heat to the food. As a result, the food is cooked sufficiently and uniformly. Since the construction and operation of the moving heater type microwave oven are well known, the detailed description of those is omitted herein.
  • Fig. 1 is a horizontal cross section of the conventional moving heater type microwave oven showing the moving heater.
  • Fig. 2 is a vertical cross section of the conventional moving heater type microwave oven showing the moving heater.
  • the main body of the conventional moving heater type microwave oven is provided with a cavity 1 in which food to be cooked is situated and cooked.
  • a moving heater 2 that is capable of being rotated is mounted on the surrounding wall of the cavity 1.
  • the moving heater 2 In the moving heater type microwave oven, when a user applies power to the microwave oven, its magnetron (not shown) is oscillated and simultaneously the moving heater 2 is operated. Consequently, the moving heater 2 radiates heat in all directions. In particular, the moving heater 2 radiates a relatively large amount of heat toward the top of the cavity 1 and a tray 3 positioned on the bottom of the cavity 1.
  • the moving heater 2 is a heat radiation type heating source that directly applies heat to food, differently from the magnetron. For this reason, when sufficient heat does not reach food, the food is not cooked sufficiently.
  • the top of the cavity 1 Since the top of the cavity 1 has low reflectivity and the distance between the top and bottom of the cavity 1 is too great for reflected heat to reach, all the heat radiated to the top of the cavity 1 cannot reach the tray 3 that supports food and is positioned on the bottom of the cavity 1. Accordingly, in the conventional moving heater type microwave oven, heating through reflection does not play a great role in heating food.
  • the reflecting plate does not perform the function of heat reflection sufficiently because the distance between the reflecting plate and the tray mounted on the bottom of the cavity is too great and heat is not reflected sufficiently by the reflecting plate due to the tilt of the moving heater by the rotation of the moving heater.
  • the amount of heat transmitted to the food on the tray is small in comparison with the amount of heat radiated by the heater, so that the heater is not utilized efficiently.
  • the cooking period of time is lengthened and the power consumption is increased, due to the inefficiency of the conventional heating device.
  • an object of the present invention is to provide a heating device for microwave ovens, which is capable of optimally utilizing heat generated by its heater.
  • Another object of the present invention is to provide a heating device for microwave ovens, which is capable of reducing power consumption.
  • the present invention provides a heating device for microwave oven, comprising: a heater for generating heat to cook food, the heater being mounted in the cavity of the microwave oven; heat reflecting means for reflecting heat radiated by the heater to the food, the heat reflecting means being fixedly mounted to the heater while being upwardly spaced apart from the heater; and clamping supports for fixedly mounting the heat reflecting means to the heater.
  • the heat reflecting means is a reflecting plate made of metallic material having superior thermal reflectivity.
  • a heat collecting surface is formed on the peripheral portion of the reflecting plate to concentrate heat radiated by the heater on the food that is positioned on the tray of the microwave oven.
  • each of the clamping supports is provided with an engagement hole for securing the upper portion of the clamping support to the heater and a ring portion for tightly accommodating a portion of the heater in the clamping support.
  • the clamping supports are made of nonmetallic material having thermal resistance.
  • the heater is a moving heater that is rotatably mounted in the cavity.
  • Fig. 3 is a horizontal cross section showing a heating device in accordance with a preferred embodiment of the present invention.
  • Fig. 4 is a vertical cross section showing the heating device of the present invention.
  • the main body of a moving heater type microwave oven is provided with a cavity 11 in which food to be cooked is situated and cooked.
  • a tray 12 for supporting food is mounted on the bottom of the cavity 11 to be rotated during the operation of the microwave oven.
  • a magnetron for generating microwaves is mounted on the surrounding wall of the cavity 11.
  • a moving heater 13 is rotatably disposed in the cavity 11 to radiate heat for the cooking of food.
  • the moving heater 13 is formed by bending a rod-shaped heating element a plurality of times in a single plane.
  • the moving heater 13 is fixed to the surrounding wall of the cavity 11 by means of a hinge 13a to be rotated around the hinge 13a.
  • a reflecting plate 14 is fixedly mounted to the moving heater 13 to reflect toward the tray 12 heat radiated by the moving heater 13.
  • a heat collecting surface 14a is formed along the peripheral portion of the reflecting plate 14 to concentrate heat that is not reflected toward the tray 12 but is undesirably dissipated in other directions, onto the tray 12.
  • the construction and material of the reflecting plate 14 must be designed to fulfill the above-described function. That is, the reflecting plate 14 is sized to cover the moving heater 13 and is made of a metallic material having superior thermal reflectivity. Otherwise, the surface of the reflecting plate 14 facing the moving heater 13 is preferably surface-treated with metallic material having superior thermal reflectivity. If the reflecting plate 14 is mounted near the moving heater 13, a distance through which the heat reflected by the reflecting plate 14 must travel to reach food on the tray 12 can be shortened, thereby improving the efficiency of heat transfer by the reflection of the reflecting plate 14.
  • the heat collecting surface 14a is preferably formed by bending the peripheral portion of the reflecting plate 14 while being integrated with the reflecting plate 14.
  • the reflecting plate 14 is fixedly mounted to the moving heater 13 by means of clamping supports 15, with the portions of the reflecting plate 14 secured to the clamping supports 15 by means of screws and the portions of the moving heater 13 secured to the clamping supports 15 by tight fitting of the moving heater 13 into the ring portions of the clamping supports 15. Accordingly, when the moving heater 13 is rotated around the hinge 13a, the reflecting plate 14 is rotated together with the moving heater 13.
  • the clamping supports 15 are preferably made of ceramic. This is because the moving heater 13 and the reflecting plate 14 are heated to high temperatures and accordingly sparks occur to cause a fire in case that the moving heater 13 and the reflecting plate 14 are made of metal and are connected through a metallic clamping supports.
  • the magnetron When a user applies electric power to the microwave oven while food is positioned on the tray 12, the magnetron is oscillated and at the same time the moving heater 13 is operated to radiate heat. At this time, the heat radiated by the moving heater 13 travels in all directions. In detail, a relatively large amount of heat is radiated in a direction toward the tray 12 and a direction away from the tray 12.
  • the heat radiated in the direction toward the tray 12 heats the food positioned on the tray 12, and the heat radiated in the direction away from the tray 12 is intercepted by the reflecting plate 14, is reflected by the reflecting plate 14 toward the tray 12 and heats the food positioned on the tray 12.
  • the remaining heat except for the heat directly radiated toward the tray 12 and reflected by the reflecting plate 14 to the tray 12, comes into contact with the heat collecting surface 14a and is reflected by the heat collecting surface 14a toward the tray 12.
  • the reflecting plate 14 is upwardly spaced apart from the moving heater 13 by the clamping supports 15 of ceramic, so that the occurrence of sparks between the moving heater 13 and the reflecting plate 14 can be prevented, thereby eliminating the danger of fire in the microwave oven.
  • the present invention is chiefly characterized in that the reflecting plate 14 is mounted to the moving heater 13 so that heat radiated by the moving heater 13 can be concentrated on food positioned on the tray 12.
  • the reflecting plate 14 is described as an example of heat reflecting means in the embodiment, the heat reflecting means is not limited to the reflecting plate 14.
  • the function of the heat reflecting means is to direct heat radiated by the heater to the tray 12 as completely as possible
  • the construction of the heat reflecting means is desirably designed according to a rotation angle within which the moving heater 13 can be rotated. For example, when the rotation angle is relatively large, heat reflected by the reflecting plate 14 may be reflected away from the tray 12. In this case, if the reflecting plate 14 is formed to have a curved surface, the heat reflected by the reflecting plate 14 can be concentrated on the tray 12 notwithstanding the rotation angle of the moving heater 12 being relatively large.
  • clamping supports 15 are described to be made of ceramic, any nonmetallic material having thermal resistance can be used as the material of the clamping supports 15. Otherwise, it is possible that the clamping supports may be made of metal and the portions of the moving heater 13 and the reflecting plate 14 in contact with the clamping supports may be coated with ceramic.
  • the present invention provides a heating device for microwave oven, which is capable of concentrating most of heat radiated by a heater on food positioned on a tray and utilizing the heat to cook the food, thereby improving the efficiency of the microwave oven.
  • the heating device since heat reflecting means is mounted not on the top of its cavity but to the heater, the distance between the reflecting means and the tray can be shortened, thereby maximizing the effect of heat reflection.
  • the heat reflecting means can be rotated together with the moving heater, the heat reflecting means can provide an optimal effect of heat reflection regardless of the rotation of the moving heater, thereby maximizing the effect of heat reflection.
  • the heating device for microwave ovens can concentrate most of the heat radiated by the heater on the food, so that the cooking period of time can be considerably shortened and the power consumption can be considerably reduced to save the cost of electricity.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)
  • Electric Stoves And Ranges (AREA)
EP00121054A 1999-12-31 2000-09-27 Heizungsvorrichtung für Mikrowellenofen Withdrawn EP1113707A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1019990068443A KR20010066585A (ko) 1999-12-31 1999-12-31 전자레인지 히터의 반사장치
KR9968443 1999-12-31

Publications (2)

Publication Number Publication Date
EP1113707A2 true EP1113707A2 (de) 2001-07-04
EP1113707A3 EP1113707A3 (de) 2005-07-06

Family

ID=19635525

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00121054A Withdrawn EP1113707A3 (de) 1999-12-31 2000-09-27 Heizungsvorrichtung für Mikrowellenofen

Country Status (4)

Country Link
EP (1) EP1113707A3 (de)
KR (1) KR20010066585A (de)
CN (1) CN1158477C (de)
BR (1) BR0004774B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100432541C (zh) * 2004-11-26 2008-11-12 乐金电子(天津)电器有限公司 电子微波炉

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070008043A (ko) * 2005-07-12 2007-01-17 엘지전자 주식회사 전자레인지의 마이크로웨이브 누설방지구조
CN101464013B (zh) * 2007-12-20 2011-07-06 乐金电子(天津)电器有限公司 具有烧烤功能的微波炉
CN107174138B (zh) * 2017-06-30 2019-05-10 浙江海迪森胶丸有限公司 食物加工组合件

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2089630A (en) * 1980-12-13 1982-06-23 Bauknecht Gmbh G An electric oven
DE4004130A1 (de) * 1990-02-10 1991-08-14 Miele & Cie Mikrowellenherd mit schwenkbarem strahlungsheizkoerper

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2089630A (en) * 1980-12-13 1982-06-23 Bauknecht Gmbh G An electric oven
DE4004130A1 (de) * 1990-02-10 1991-08-14 Miele & Cie Mikrowellenherd mit schwenkbarem strahlungsheizkoerper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100432541C (zh) * 2004-11-26 2008-11-12 乐金电子(天津)电器有限公司 电子微波炉

Also Published As

Publication number Publication date
EP1113707A3 (de) 2005-07-06
CN1302978A (zh) 2001-07-11
CN1158477C (zh) 2004-07-21
KR20010066585A (ko) 2001-07-11
BR0004774A (pt) 2001-09-25
BR0004774B1 (pt) 2011-03-22

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