EP3646672B1 - Mikrowellen-gargerät mit lambda-viertel-falle - Google Patents

Mikrowellen-gargerät mit lambda-viertel-falle Download PDF

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Publication number
EP3646672B1
EP3646672B1 EP18729969.8A EP18729969A EP3646672B1 EP 3646672 B1 EP3646672 B1 EP 3646672B1 EP 18729969 A EP18729969 A EP 18729969A EP 3646672 B1 EP3646672 B1 EP 3646672B1
Authority
EP
European Patent Office
Prior art keywords
microwave
door
cooking appliance
teeth
profile
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.)
Active
Application number
EP18729969.8A
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German (de)
English (en)
French (fr)
Other versions
EP3646672A1 (de
Inventor
Markus Kuchler
Kerstin RIGORTH
Sebastian Sterz
Matthias Vogt
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
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 BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Priority to PL18729969T priority Critical patent/PL3646672T3/pl
Publication of EP3646672A1 publication Critical patent/EP3646672A1/de
Application granted granted Critical
Publication of EP3646672B1 publication Critical patent/EP3646672B1/de
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Anticipated expiration legal-status Critical

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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
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • H05B6/763—Microwave radiation seals for doors

Definitions

  • the invention relates to a microwave cooking appliance, having a door which, when closed, covers a loading opening of a cooking chamber and which has a profile-like trap structure which, when closed, forms a quarter-wave trap around the loading opening with an electrically conductive door flange, wherein the latch structure has a metallic throttle profile with an open side opposite the door flange, an internal metal tongue projects into the open side laterally on the inside and an external metal tongue projects laterally on the outside, which are electrically connected to the throttle profile and are separated from one another by a microwave entry slot, and the microwave inlet slot is covered by a microwave-transparent cover.
  • the invention can be applied particularly advantageously to microwave household appliances, for example independent microwave cooking appliances or ovens and/or steam cooking appliances with a microwave function.
  • a cooking space can be charged with microwaves in order to heat foodstuffs located in the cooking space.
  • the cooking chamber is delimited by a cooking chamber wall or "muffle" which is fundamentally impermeable to microwave radiation.
  • the cooking chamber typically has a loading opening at the front, which can be closed by means of a door.
  • a closed door covers the loading opening and an associated peripheral area thereof, referred to as a door flange.
  • the door and a gap between the door and the door flange should not let any microwaves through to the outside and should therefore be sealed against escaping microwave radiation, even if there is no electrical contact in the overlapping area between the door flange and the door.
  • ⁇ /4 or quarter-wave traps are known, lambda designating a wavelength of the microwaves.
  • GB 2196520A , US 2004/0079751 A1 and DE 10 2014 224 053 A1 describe quarter-wave traps.
  • the lambda quarter traps are located behind a cover that protects them from dirt or mechanical damage.
  • the cover can be made of microwave transparent plastic.
  • the end DE 102 56 624 B4 , U.S. 2011/0290230 A1 , EP 2 775 794 A1 and DE 3536589 C2 it is known to position the quarter-wave trap behind a viewing window facing the cooking chamber.
  • Other microwave ovens with quarter-wave traps are from the documents DE 31 06 786 A1 , EP 0858247 A2 , DE 102006042992 A1 or DE 8606301 U1 famous.
  • a particularly high degree of insensitivity to an oblique incidence of microwave radiation should also be made possible.
  • a particularly compact dimensioning of the quarter-wave trap should be made possible.
  • a microwave cooking appliance having a door which, in the closed state, covers a loading opening of a cooking space that can be charged with microwaves.
  • the microwave cooking appliance is described below with the door in the closed state, unless an open state is expressly indicated.
  • the door has a profile-like latch structure.
  • the trap structure forms, with an electrically conductive door flange, a quarter-wave trap for microwaves surrounding the feed opening.
  • the latch structure has a metallic profile (hereinafter referred to as "choke profile" without loss of generality) with an open side opposite the door flange.
  • a metal tongue protrudes laterally into the open side on the inside (hereinafter referred to as “inner metal tongue” without loss of generality).
  • a laterally inward arrangement may also be referred to or viewed as a radially inward arrangement when viewed from the front or as a cooking cavity side arrangement.
  • a metal tongue protrudes laterally on the outside into the open side (hereinafter referred to as “external metal tongue” without loss of generality).
  • a laterally outside arrangement can also be referred to or regarded as a radially outside arrangement in a frontal view or as an arrangement facing away from the cooking chamber.
  • the metal tongues are electrically connected to the choke profile and spaced from each other in the open side. In other words, they are through a slit (hereinafter referred to without loss of generality as "microwave entry slot”) separated from each other.
  • the microwave entry slot is in particular covered by a microwave-transparent cover.
  • the throttling profile is surrounded laterally on the outside by a door area (referred to below as the “parallel overlapping area” without loss of generality) protruding from the throttling profile in the direction of the door flange.
  • the parallel overlap area has a door flange-facing surface (hereinafter referred to as "overlap surface”) of electrically conductive material, which is shaped similarly to the door flange overlapped area and is spaced apart from the door flange.
  • This microwave cooking appliance has the advantage that the latch structure forms a quarter-wave door latch whose throttling or shielding effect is particularly insensitive to changes, in particular increases in the door gap. This in turn results in greater stability against, among other things, thermal movements and against manufacturing tolerances, which has clear advantages for the production process.
  • the trap structure also enables particularly high insensitivity to an oblique incidence of microwave radiation. The smaller the shift in the ideal effective frequency when the angle of incidence of the microwave radiation emerging from the cooking chamber changes, the better the throttle profile can ensure low leakage radiation. In addition, a particularly compact dimensioning of the lambda quarter trap is made possible, which takes up less space inside the door than before.
  • the optional microwave-transparent cover prevents contamination or damage to the profile, especially contamination of the cavity of the throttle profile.
  • the microwave cooking appliance can be a household appliance, in particular a kitchen appliance.
  • the microwave cooking appliance can be a stand-alone microwave cooking appliance or another cooking appliance - e.g. an oven and/or a steamer - with a microwave function.
  • the door is microwave-proof against radiation and can also be referred to as a microwave door.
  • the fact that the door has a profile-like latch structure can include, in particular, that the latch structure has at least essentially the same cross-sectional shape along its longitudinal extension ("profile direction").
  • profile direction runs around the loading opening in front view.
  • the metal tongues attach in particular parallel to the open side.
  • the throttle profile is a throttle profile with a C-shaped cross section. This enables a particularly simple production with an effective throttling or shielding effect.
  • the metal tongues being electrically connected to the choke profile may include the metal tongues having been manufactured separately and then connected to the choke profile, for example by welding. It is an alternative development that the metal tongues are integrated areas of the throttling profile, in particular have been produced in one piece with the throttling profile.
  • the metal tongues, the choke profile and/or the overlap area can be made of aluminum, copper and/or steel, for example. In general, any other suitable electrically highly conductive material can also be used instead of metal.
  • the microwave entry slot has at least essentially the same width.
  • the metal tongues are set back in the direction of the inside of the door in relation to the overlapping surface in a cross-sectional view.
  • the parallel overlapping area can be attached directly to the metal tongue lying on the outside or to the throttle profile, in particular attached in a step-like manner.
  • the parallel overlapping area and the throttle profile can have been manufactured in one piece or alternatively have been manufactured separately and subsequently connected to one another.
  • the overlapping surface is shaped in the same way as the area of the door flange it covers results in an at least essentially equal distance between these two surfaces and thus a particularly uniform shielding effect.
  • the overlapping surface and the area of the door flange covered by it can in particular be flat or planar and arranged parallel to one another, which enables a particularly stable throttling effect.
  • At least one of the metal tongues extends into a cavity formed by the throttle profile. This achieves the advantage that the travel paths of the microwave radiation are lengthened and the volume of the cavity can be reduced as a result. As a result, the height and/or width of the cooking space—and thus the total volume that can be used for cooking food—can be increased without loss of a microwave-shielding property.
  • the fact that at least one of the metal tongues extends into the cavity can in particular include that this metal tongue is bent into the cavity or has one or more bends in cross section. At least one of the metal tongues thus runs behind the open side of the throttle profile.
  • only the metal tongue lying on the outside, only the metal tongue lying on the inside, or both metal tongues can run into the cavity or be bent accordingly.
  • At least one of the metal tongues is provided with a row of teeth or toothed in the profile direction, the teeth being separated from one another in the profile direction, in particular by interruptions such as slots (hereinafter also referred to as "separating slots” without loss of generality).
  • microwave radiation present in the cooking chamber of the microwave cooking appliance strikes the quarter-wave trap at different angles of incidence.
  • An exact prediction of the occurring angles of incidence is very complex, since the microwave radiation, after it has been generated, for example in a magnetron, can be reflected several times on the walls of the cooking appliance before it hits the quarter-wave trap.
  • the effectively effective trap length of a increases non-toothed trap by a factor of 1/cos( ⁇ ), where ⁇ describes an angle between a surface normal of a door plane and a propagation or propagation direction of the incident microwaves.
  • the effective frequency also varies with the effective trap length, so that the quarter-wave trap without teeth no longer works optimally at any angle of incidence.
  • This effect is particularly pronounced in microwave cooking appliances with large muffle or cooking chamber dimensions, since different angles of incidence can occur in a very broad spectrum.
  • the quarter-wave trap is not subdivided or serrated, surface currents can flow unhindered in the direction of wave propagation. Interruptions between the teeth, on the other hand, prevent this and deflect the currents in the direction of the interruptions, so that the associated microwaves have a noticeably smaller angle of incidence. This angle of incidence can be so small that the situation almost corresponds to a normal incoming microwave.
  • This refinement therefore enables a particularly high level of insensitivity to an oblique incidence of microwave radiation.
  • At least one of the metal tongues is slotted by means of a series of laterally aligned separating slots.
  • An arrangement of a metal comb has proven to be particularly effective, the teeth of which have a width of approximately 4 mm and the slots of which have a width of approximately 2 mm.
  • the teeth are bent towards the cavity on at least one side adjacent to a separating slot.
  • the teeth on a side adjacent to the microwave entry slot are bent in the direction of the cavity. Also these Configuration enables a significantly improved effect of the throttle profile or the quarter-wave trap compared to an oblique incidence of microwaves.
  • the lengths and/or the spacing of the interruptions, etc. can be changed in alternation.
  • separating slits in particular all separating slits—are rectilinear slits and at least some of the teeth—in particular all teeth—of at least one of the metal tongues have a rectangular basic shape. This configuration is particularly easy to produce.
  • the teeth have an annular shape. This enables an even better effect of the throttle profile or the quarter-wave trap compared to an oblique incidence of microwaves.
  • the ring shape may be a continuous curved shape such as a donut shape, an oval shape, an elliptical shape, etc., or a polyline-like shape such as a rectangular shape, etc.
  • a configuration of the teeth with an at least approximately elliptical basic shape (“elliptical teeth”) is particularly advantageous.
  • the ring-shaped teeth can be self-contained.
  • the ring-shaped teeth in particular all ring-shaped teeth—are interrupted.
  • the associated recesses prevent wave propagation along the ring shape, which further improves the throttling effect.
  • the recesses can be arranged symmetrically in the middle. However, the recesses can alternatively be in other segments or Angular directions of the annular teeth are located. Optionally, these positions can also be alternating.
  • the ring-shaped teeth can be connected to the throttle profile and/or to the overlapping area via a web that is separate for each tooth.
  • the ring-shaped teeth can be seated on a common, continuous web. However, they can also be connected seamlessly or via a direct connection to the throttle profile and/or to the overlapping area of the door.
  • the microwave-transparent cover is a self-supporting cover. Such a cover is particularly stable and also prevents the cover from forming ripples in a contact area with the throttle profile.
  • microwave-transparent cover is attached to the trap structure by means of a permanently elastic, temperature-resistant and grease-resistant sealing compound.
  • the sealing compound particularly reliably prevents steam or dirt from penetrating into the cavity of the throttle profile through a gap between the cover and the throttle profile. It is a further development that the sealing compound is or has temperature-resistant silicone.
  • the sealing compound is arranged in an area that is formed by the protruding parallel overlapping area, the metal tongue lying on the outside and an edge of the microwave-transparent cover.
  • the microwave-transparent cover has a pane made of glass, in particular hardened glass. Glass is particularly resistant to thermal and chemical influences and also - especially in the form of hardened glass - to mechanical loads.
  • the covering surface of the parallel overlapping region protrudes beyond the microwave-transparent covering.
  • the microwave-transparent cover can be protected particularly reliably against direct mechanical contact with the door flange. This also results in a particularly reliable and tolerant shielding effect.
  • the covering surface of the parallel overlapping area and the microwave-transparent cover can be arranged flush with one another on the flange side.
  • Fig.1 shows a sectional side view of a section of a microwave cooking appliance 1 according to a first exemplary embodiment, which is not part of the claimed invention, with a door 2 which, in the closed state shown, covers a charging opening 3 of a cooking chamber 4 .
  • the cooking space 4 is delimited by a cooking space wall or muffle 5 .
  • the door has a profile-like latch structure 6, which is shown here on an upper edge of the door 2.
  • the trap structure 6 forms a quarter-wave trap with an electrically conductive door flange 7 surrounding the charging opening 3 .
  • the latch structure 6 has a metal throttle profile 8 with a C-shaped cross section and an open side 9 opposite the door flange 7 .
  • An internal metal tongue 10 protrudes laterally inside the open side 9 and an external metal tongue 11 protrudes laterally outside.
  • the metal tongues 10 and/or 11 can be designed to be continuous or uninterrupted or in the form of a strip along a profile direction running perpendicularly to the plane of the page.
  • the metal tongues 10 and/or 11 can be formed in a comb-like or tooth-like manner along the profile direction.
  • the microwave entry slot 12 is covered by a microwave-transparent cover in the form of a glass pane 13 made of hardened glass, shown as an example. This prevents steam and dirt from penetrating into a cavity 14 formed by the throttle profile 8.
  • the throttling profile 8 is surrounded laterally on the outside by a parallel overlapping area 15 which protrudes in the direction of the door flange 7 and which, in one variant, is worked out in one piece with the throttling profile 8 here.
  • the parallel overlapping region 15 has a covering surface 16 made of electrically conductive material facing the door flange 7 , which is shaped in the same way as the region of the door flange covered by it (namely here vertically flat) and is arranged at a distance from the door flange 7 .
  • the door flange 7 and the overlapping surface 16 consequently form a door gap 17.
  • the glass pane 13 is designed flush with the covering surface 16 here.
  • the glass pane 13 has, in its area opposite the charging opening 3, a viewing grid 18 which is impermeable to microwaves and which can be formed, for example, in the form of a printed metal grid.
  • the glass pane 13 is attached to the latch structure 6 by means of a permanently elastic, temperature-resistant and grease-resistant adhesive (adhesive) or sealing compound 19 .
  • the sealing compound 19 is introduced here in a lateral intermediate space between an edge of the glass pane 13 and the parallel overlapping area 15 .
  • Fig.2 shows a sectional side view of a section of a microwave cooking appliance 21 according to a second embodiment, which is not part of the claimed invention, with a door 22.
  • the door 22 is designed similarly to the door 2, but now the metal tongue 23 on the outside is Case structure 26 is partially bent in cross-section into a cavity 25 formed by a throttle profile 24 .
  • the metal tongue 23 is thus kinked or bent over in cross section.
  • the choke profile 24 and consequently the cavity 25 can be made smaller with the same shielding effect, here: have a lower height than the cavity 14.
  • the metal tongues 10 and/or 23 can be designed to be continuous or uninterrupted along the profile direction running perpendicular to the plane of the page.
  • the metal tongues 10 and/or 23 can be formed in a comb-like or tooth-like manner along the profile direction.
  • Fig.3 shows a sectional side view of a section of a microwave cooking appliance 31 according to a third embodiment, which is not part of the claimed invention, with a door 32.
  • the door 32 is designed similarly to the door 2, but the metal tongue 33 on the inside Case structure 36 is partially bent in cross-section into a cavity 35 formed by a throttle profile 34 .
  • both metal tongues can be bent into the cavity.
  • Fig.4 shows a section of the microwave cooking appliance 1 according to its second variant in a view obliquely from below, with the glass pane 13 shown partially hidden are separated from each other by straight separating slots 45.
  • the teeth 44 each have a rectangular shape with a width in the profile direction P of 4 mm, while the separating slots 45 have a width of 2 mm.
  • Fig.5 shows in a view similar to Fig.4 the microwave cooking appliance 21 according to its second variant.
  • the door 22 has an external metal tongue 23 with teeth 54 which are separated from one another by separating slots 55 .
  • the teeth 54 are sectional bent in the direction of the cavity 25 of the throttle profile 24, specifically about a bending line B extending in the profile direction P. This can also be expressed in such a way that the teeth 54 on or along a side adjacent to the microwave entry slot 12 are bent in the direction of the cavity 25 are bent.
  • Fig.6 shows in a view similar to Fig.4 a microwave cooking appliance 61 according to a fourth embodiment.
  • a door 62 is designed similarly to the door 42, but the metal tongue 63 on the outside of a latch structure 67 now has teeth 64, which are bent in sections in the direction of a cavity 65 of a throttle profile 66, in each case by a direction perpendicular to the profile direction P Bending line C. This can also be expressed as the teeth 64 are bent towards the cavity 65 on at least one side adjacent to a separation slot 68 .
  • Fig.7 shows in a view similar to Fig.4 a microwave cooking apparatus 71 according to a fifth embodiment which is not part of the claimed invention.
  • a door 72 is similar to the door 42, but now the outboard metal tab 73 has teeth 74 that are elliptical in shape.
  • the teeth 74 here all have a respective interruption 76 at their end facing the microwave entry slot 75 .
  • the interruptions can be present at other points on the teeth, possibly at different points in the profile direction.
  • the ring-shaped teeth can be uninterrupted.
  • the teeth 74 can also be connected (Fig. via a common continuous web or also seamlessly in direct connection with the latch structure 77, in particular with the throttle profile 78 or with the Parallel overlap area 15.
  • Fig.8 shows a plot of an attenuation in dB on the y-axis against a frequency in GHz on the x-axis of a microwave cooking appliance with characteristic attenuation curves F1 and F2 for the prior art DE 102 56 624 B4 and with characteristic damping curves F3 and F4 for a quarter-wave trap according to the present invention, eg according to the exemplary embodiment according to FIG Fig.4 .
  • the attenuation curves F1 and F3 show the case of an "ideal" door gap of 1 mm, i.e. a door gap in which an effective frequency of the microwave trap or the trap structure has been brought into line with an operating frequency of a microwave cooking appliance.
  • the door gap will vary in size, with its widening representing the critical case.
  • the causes are varied and can be based, for example, on manufacturing tolerances or on thermal movements of the device during heating processes. In real use, this change in the door gap as well as different angles of incidence ⁇ of the microwave radiation contribute to an unwanted change in the shielding properties.
  • a quarter-wave trap shields microwave leakage radiation particularly reliably if, due to its structure, it is particularly insensitive to changes, in particular enlargements, of the door gap. Increased stability against changes is primarily reflected in a smaller change in the damping characteristics - in particular in a small shift in the frequency position of maximum damping.
  • the damping curves F2 and F4 show the case of a door gap that is 1 mm wider (i.e., a total width of 2 mm).
  • the damping characteristics are practically the same, as can be seen from the damping curves F1 and F3.
  • the positions of maximum attenuation are at the same microwave frequency of approximately 2.455 GHz.
  • the damping curves F2 and F4 show clear differences.
  • the attenuation curve F4 of the quarter-wave trap according to the present invention has a significantly smaller shift in the frequency position of maximum attenuation than the attenuation curve F2 of the prior art.
  • FIG.9 Figure 12 shows a plot of a frequency shift of the position of maximum attenuation in GHz on the y-axis versus an increase in door gap in mm on the x-axis for the prior art DE 102 56 624 B4 (Curve G1) and for the quarter-wave trap Fig.8 (Curve G2).
  • the fact that the quarter-wave trap according to the present invention is less sensitive to changes in the door gap means that a larger door opening is possible before the leakage radiation reaches an unacceptably high value. This gives greater stability to thermal movement and manufacturing tolerances, among other things, which has clear advantages for the production process, among other things.
  • Fig.10 shows a plot of an attenuation in dB on the y-axis against a frequency in GHz on the x-axis with characteristic attenuation curves H1 and H2 for the prior art DE 102 56 624 B4 and with characteristic attenuation curves H3 and H4 for a quarter-wave trap with a trap structure 77 according to FIG Fig.7 .
  • the trap structure 77 off Fig.7 with elliptical or generally ring-shaped teeth compensates the effect of an electromagnetic microwave that arrives at an angle much more effectively than the prior art. Due to the lower sensitivity to changes in the angle of incidence ⁇ , this embodiment has a particularly reliable damping function as a microwave trap.
  • elliptical teeth can also be bent into a cavity and/or different types of teeth can be present on a metal tongue, etc.
  • a numerical specification can also include exactly the specified number as well as a usual tolerance range, as long as this is not explicitly excluded.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)
EP18729969.8A 2017-06-26 2018-06-08 Mikrowellen-gargerät mit lambda-viertel-falle Active EP3646672B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18729969T PL3646672T3 (pl) 2017-06-26 2018-06-08 Mikrofalowe urządzenie do obróbki termicznej z pułapką ćwierćfalową

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017210730.8A DE102017210730A1 (de) 2017-06-26 2017-06-26 Mikrowellen-Gargerät mit Lambda-Viertel-Falle
PCT/EP2018/065184 WO2019001932A1 (de) 2017-06-26 2018-06-08 Mikrowellen-gargerät mit lambda-viertel-falle

Publications (2)

Publication Number Publication Date
EP3646672A1 EP3646672A1 (de) 2020-05-06
EP3646672B1 true EP3646672B1 (de) 2022-03-02

Family

ID=62563166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18729969.8A Active EP3646672B1 (de) 2017-06-26 2018-06-08 Mikrowellen-gargerät mit lambda-viertel-falle

Country Status (6)

Country Link
US (1) US11265976B2 (zh)
EP (1) EP3646672B1 (zh)
CN (1) CN110754138B (zh)
DE (1) DE102017210730A1 (zh)
PL (1) PL3646672T3 (zh)
WO (1) WO2019001932A1 (zh)

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50150942A (zh) * 1974-05-24 1975-12-04
DE3106786A1 (de) * 1981-02-24 1982-09-09 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Mikrowellenerhitzungsgeraet
US4475023A (en) * 1981-09-25 1984-10-02 Hitachi Heating Appliances Co., Ltd. Microwave heating apparatus with fundamental and second higher harmonic chokes
JPS6171805U (zh) 1984-10-15 1986-05-16
EP0184069B1 (en) * 1984-11-20 1992-04-29 Matsushita Electric Industrial Co., Ltd. Door assembly for microwave heating apparatus
DE8606301U1 (de) * 1986-03-07 1990-05-23 Bosch-Siemens Hausgeräte GmbH, 8000 München Mikrowellenofen
GB2196520B (en) 1986-08-07 1990-01-04 Hitachi Heating Appl Microwave heating apparatus
US5075525A (en) * 1990-06-25 1991-12-24 Goldstar Co., Ltd. Wave shielding device for microwave oven
GB2249245B (en) * 1990-10-24 1994-12-14 Gold Star Co Microwave shielding device for a door of a microwave oven
KR0148906B1 (ko) * 1995-04-03 1998-12-15 구자홍 전자레인지의 전파누설방지용 도어구조
KR100218957B1 (ko) * 1997-02-10 1999-09-01 윤종용 전자렌지의 고주파 누설방지장치
JP3492876B2 (ja) * 1997-03-05 2004-02-03 株式会社東芝 高周波加熱装置
KR100486588B1 (ko) 2002-10-24 2005-05-03 엘지전자 주식회사 전자레인지의 도어
DE10256624B4 (de) 2002-12-03 2005-12-08 Miele & Cie. Kg Mikrowellenherd
KR100662415B1 (ko) * 2005-08-22 2007-01-02 엘지전자 주식회사 전자기파를 이용한 가열 장치
DE102006042992A1 (de) * 2006-09-13 2008-04-03 BSH Bosch und Siemens Hausgeräte GmbH Mikrowellenfalle
JP2011174669A (ja) * 2010-02-25 2011-09-08 Panasonic Corp 高周波加熱調理装置
US9179506B2 (en) 2010-05-26 2015-11-03 Lg Electronics Inc. Door choke and cooking apparatus including the same
EP3490341B1 (en) 2013-03-04 2020-10-28 Electrolux Appliances Aktiebolag A door for a microwave appliance
DE102014224053A1 (de) 2014-11-25 2016-05-25 BSH Hausgeräte GmbH Haushaltsgargerät

Also Published As

Publication number Publication date
CN110754138A (zh) 2020-02-04
US20210092807A1 (en) 2021-03-25
PL3646672T3 (pl) 2022-05-09
EP3646672A1 (de) 2020-05-06
US11265976B2 (en) 2022-03-01
CN110754138B (zh) 2022-06-24
DE102017210730A1 (de) 2018-12-27
WO2019001932A1 (de) 2019-01-03

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