EP3646672A1 - Appareil de cuisson à micro-ondes comprenant un piège quart d'onde - Google Patents

Appareil de cuisson à micro-ondes comprenant un piège quart d'onde

Info

Publication number
EP3646672A1
EP3646672A1 EP18729969.8A EP18729969A EP3646672A1 EP 3646672 A1 EP3646672 A1 EP 3646672A1 EP 18729969 A EP18729969 A EP 18729969A EP 3646672 A1 EP3646672 A1 EP 3646672A1
Authority
EP
European Patent Office
Prior art keywords
microwave
door
cooking appliance
teeth
door flange
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
EP18729969.8A
Other languages
German (de)
English (en)
Other versions
EP3646672B1 (fr
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/fr
Application granted granted Critical
Publication of EP3646672B1 publication Critical patent/EP3646672B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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, comprising a door which in the closed state covers a charging opening of a cooking chamber and which has a profile-like latching structure which forms in the closed state with an electrically conductive door flange surrounding the charging opening lambda quarter case, wherein the trap structure has a metallic throttle profile with an open side opposite the door flange, in the open side laterally inside an inner metal tongue protrudes and laterally outside an outer metal tongue protrudes, which are electrically connected to the throttle profile and separated by a microwave entrance slot, and the microwave entry slot is covered by a microwave-transparent cover.
  • the invention is particularly advantageously applicable to microwave household appliances, such as stand-alone microwave cooking appliances or ovens and / or Dampfgar margarered with microwave function.
  • a cooking chamber can be supplied with microwaves to heat food in the cooking chamber.
  • the cooking chamber is limited by a cooking chamber wall or "muffle", which is basically impermeable to microwave radiation.
  • the cooking chamber typically has a front-side charging opening, which can be closed by means of a door.
  • a closed door covers the loading opening and an associated edge area thereof, referred to as a door flange.
  • the door and a gap between the door and the door flange should not transmit microwaves to the outside and thus be leak-tight against leaking microwave radiation, even if there is no electrical contact in the overlapping area between door flange and door.
  • ⁇ / 4 or lambda quarter traps where Lambda is a wavelength of the microwaves.
  • GB 2196520 A, US 2004/0079751 A1 and DE 10 2014 224 053 A1 describe lambda quarter traps.
  • the quarter-wave traps are behind a cover that protects them from dirt or mechanical damage.
  • the cover can be made of microwave-transparent plastic.
  • DE 102 56 624 B4, US 201 1/0290230 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.
  • a microwave cooking appliance comprising a door which, in the closed state, covers a charging opening of a cooking chamber which can be acted upon by microwaves.
  • the microwave cooking appliance is described with the door in the closed state, unless it is expressly referred to an open state.
  • the door has a profile-like trap structure.
  • the trap structure forms in the closed state of the door with an electrically conductive door flange surrounding the feed opening lambda quarter trap for microwaves.
  • the trap structure has a metallic profile (hereinafter referred to as "throttle profile” without limitation of generality) with an open side opposite the door flange. In the open side protrudes laterally inside a metal tongue (hereinafter referred to as "internal metal tongue” without limitation of generality).
  • a laterally inward arrangement may also be referred to or viewed as a radially inward arrangement in frontal view or as a garnish-side arrangement.
  • a metal tongue protrudes into the open side (hereinafter referred to as "external metal tongue” without restricting generality).
  • a laterally outboard arrangement may also be referred to or viewed as a radially outboard arrangement in frontal view, or as an off-garrisoned arrangement.
  • the metal tabs are electrically connected to the throttle profile and spaced from each other in the open side. They are in other words through a slot (hereafter without limitation to the general public as "microwave entry slot") separated from each other.
  • the microwave entry slot is covered in particular by a microwave-transparent cover.
  • the throttle profile is laterally on the outside of a door region protruding from the throttle profile in the direction of the door flange (hereinafter referred to as "parallel overlap region” without restriction of generality).
  • the parallel overlapping area has a surface facing the door flange (hereinafter referred to as “overlay area” hereinafter) of electrically conductive material which is similarly formed to the covered area of the door flange and spaced from the door flange.
  • This microwave cooking appliance has the advantage that the trap structure forms a lambda quarter-door trap, the throttling or screening effect against changes, especially enlargements, of the door gap is particularly insensitive. This in turn gives greater stability to u.a. thermal movements and manufacturing tolerances, which has significant advantages for the production process. Also, the trap structure allows a particularly high insensitivity to an oblique incidence of microwave radiation. The smaller the displacement of the ideal reaction frequency with a change in the angle of incidence of the microwave radiation emerging from the cooking chamber, the better the throttle profile can ensure a low leakage radiation. In addition, a particularly compact dimensioning of the Lambda quarter trap is made possible, which requires less space inside the door than before.
  • a height and width of the cooking chamber - and thus the total volume usable for food treatment - can be increased.
  • the optional microwave-transparent cover prevents contamination or damage to the profile, in particular a contamination of the cavity of the throttle profile.
  • the microwave cooking appliance may be a household appliance, in particular a kitchen appliance.
  • the microwave cooking appliance can be a self-contained microwave cooking appliance or another cooking appliance - e.g. an oven and / or a steam cooker - be with microwave function.
  • the door is microwave-tight against radiation and can also be called a microwave door.
  • the fact that the door has a profile-like trap structure may in particular include that the trap structure has an at least substantially identical cross-sectional shape along its longitudinal extent ("profile direction").
  • profile direction runs in front view around the feed opening.
  • the metal tongues start in particular parallel to the open side.
  • the throttle profile is a cross-sectionally C-shaped throttle profile. This allows a particularly simple production with effective throttling or shielding effect.
  • That the metal tongues are electrically connected to the throttle profile may include that the metal tongues have been manufactured separately and then connected to the throttle profile, e.g. through a weld. It is an alternative development that the metal tongues are integrated areas of the throttle profile, in particular have been made in one piece with the throttle profile.
  • the metal tongues, the throttle profile and / or the overlap area may be e.g. made of aluminum, copper and / or steel. Generally, any other suitable electrically highly conductive material may be used instead of metal.
  • the microwave entry slot has an at least substantially equal width.
  • the metal tongues are set back in cross-sectional view in relation to the covering surface in the direction of the door interior.
  • the parallel overlap region can be applied directly to the outer metal tongue or to the throttle profile, in particular starting stepwise.
  • the parallel overlap region and the throttle profile may be made in one piece or, alternatively, manufactured separately and subsequently joined together.
  • the fact that the covering surface is shaped identically to the region of the door flange covered by this results in an at least substantially equal spacing of these two surfaces and thus a particularly uniform shielding effect.
  • the overlapping surface and the region of the door flange covered therewith may in particular be flat or planar and arranged parallel to one another, which allows a particularly stable throttling action.
  • At least one of the metal tongues extends into a cavity formed by the throttle profile.
  • the advantage is achieved that the paths of the microwave radiation can be extended and thereby the volume of the cavity can be reduced. Consequently, without loss of a microwave shielding property, a height and / or a width of the cooking chamber - and thus the total volume usable for food treatment - can be increased.
  • the fact that at least one of the metal tongues extends into the cavity may 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. In general, only the outer metal tongue, only the inner metal tongue or both metal tongues can extend into the cavity or be bent accordingly.
  • At least one of the metal tongues in the profile direction is equipped or serrated with a row of teeth, wherein the teeth are separated from each other in the profile direction, in particular by interruptions such as slots (hereinafter also without limitation of generality as “separating slots” designated).
  • microwave radiation present in the cooking chamber of the microwave cooking appliance strikes the quarter-wave trap at different angles of incidence.
  • An accurate prediction of the incidence angles occurring is very complicated, since the microwave radiation after its generation, for example in a magnetron, can be reflected several times on the walls of the cooking appliance before it encounters the quarter-wave trap.
  • the effectively effective trap length is increased not toothed trap by a factor of 1 / cos (9), where ⁇ describes an angle between a surface normal of a door plane and a propagation or propagation direction of the incident microwaves. Accordingly, with the effective trap length, the effective frequency also varies, so that the quarter-wave trap without teeth at any angle of incidence no longer acts optimally.
  • the teeth have a width of about 4 mm and the slots have a width of about 2 mm.
  • the teeth are bent on at least one side adjacent to a separating slot in the direction of the cavity. This refinement allows a further clearly improved effect of the throttle profile or the quarter-wave trap compared to an oblique incidence of microwaves.
  • the teeth are bent on a side adjacent to the microwave entrance slot side in the direction of the cavity.
  • the lengths and / or the distances of the interruptions, etc. can be changed alternately.
  • At least some of the separating slots - in particular all separating slots - straight-line slots and at least some of the teeth - in particular all teeth - at least one of the metal tongues have a rectangular basic shape. This embodiment is particularly easy to produce.
  • the teeth have a ring shape.
  • the ring shape may be a continuous curved shape such as a circular ring shape, an oval shape, an elliptic shape, etc., or a polygonal shape such as a rectangular shape, etc.
  • Particularly advantageous is an embodiment of the teeth with an at least approximately elliptical basic shape ("elliptical teeth").
  • the annular teeth may be self-contained.
  • annular teeth - in particular all annular teeth - are interrupted.
  • the associated recesses prevent wave propagation along the ring shape, which further improves the throttling effect.
  • the recesses may be arranged symmetrically in the middle.
  • the recesses may alternatively be in other segments or Angular directions of the annular toothing are located. Optionally, these positions may also be alternating.
  • the annular teeth may be connected to the throttle profile and / or to the overlap region via a separate web for each tooth.
  • the annular teeth can sit on a common, continuous web.
  • they can also be connected without any contact or via a direct connection with the throttle profile and / or with the overlapping region of the door.
  • the microwave-transparent cover is a self-supporting cover. Such a cover is particularly stable and also prevents formation of ripples of the cover at a contact region to the throttle profile.
  • the microwave-transparent cover is fixed by means of a permanently elastic, temperature-resistant and grease-resistant sealant to the trap structure. The sealant prevents particularly reliable penetration of steam or dirt into the cavity of the throttle profile through a gap between the cover and the throttle profile. It is a development that the sealant is or has temperature-resistant silicone.
  • the sealing compound is arranged in a region which is formed by the above parallel overlapping region, the outer metal tongue and an edge of the microwave-transparent cover.
  • the microwave-transparent cover has a pane of glass, in particular of tempered glass.
  • Glass is particularly resistant to thermal and chemical influences and also - especially in the form of tempered glass - against mechanical stress.
  • the overlapping area of the parallel overlapping area projects beyond the microwave-transparent cover.
  • the microwave-transparent cover can be particularly reliably protected against direct mechanical contact with the door flange. Also, this results in a particularly reliable ge and tolerant shielding effect.
  • the overlapping surface of the parallel overlapping region and the microwave-transparent cover can be arranged flush with each other on the flange side.
  • FIG. 1 shows a sectional side view of a detail of a microwave cooking appliance 1 according to a first embodiment with a door 2, which covers a feed opening 3 of a cooking chamber 4 in the closed state shown.
  • the cooking chamber 4 is limited by a cooking chamber or muffle 5.
  • the door has a profile-like latch structure 6, which is shown here at an upper edge of the door 2.
  • the trap structure 6 In the closed state of the door 2 with an electrically conductive door flange 7, the trap structure 6 forms a lambda quarter trap circulating around the feed opening 3.
  • the trap structure 6 has a metallic, in cross-section C-shaped throttle profile 8 with an open side 9 opposite the door flange 7. In the open side 9 laterally inside an inner metal tongue 10 and laterally on the outside an external metal tongue 1 1 protrudes.
  • the metal tongues 10 and 1 1 are here designed in one piece with the throttle profile 8 and separated by a microwave inlet slot 12.
  • the metal tongues 10 and / or 11 may be continuous or uninterrupted or band-shaped along a profile direction running perpendicular to the plane of the page.
  • the metal cords 10 and / or 1 1 may be comb-like or tooth-like along the profile direction.
  • the microwave entry slot 12 is covered by a microwave-transparent cover in the form of an exemplified glass plate 13 made of tempered glass. This prevents penetration of steam and dirt into a cavity 14 formed by the throttle profile 8.
  • the throttle profile 8 is laterally on the outside of a projecting in the direction of the door flange 7 parallel overlap region 15, which is designed here in one variant in one piece with the throttle profile 8.
  • the parallel overlap region 15 has an overlapping surface 16, which faces the door flange 7, of electrically conductive material which is similarly shaped (namely, is vertically vertical here) to the region of the door flange covered therefrom and is arranged at a distance from the door flange 7.
  • the door flange 7 and the covering surface 16 thus form a door gap 17.
  • the glass pane 13 is here formed flush with the surface of the covering 16.
  • the glass pane 13 has, at its region opposite the feed opening 3, a microwave-impermeable viewing grid 18, which can be shaped, for example, in the form of a printed metal grid.
  • the glass pane 13 is attached to the trap structure 6 by means of a permanently elastic, temperature-resistant and grease-resistant adhesive bond or sealant 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.
  • 2 shows a sectional side view of a section of a microwave cooking appliance 21 according to a second embodiment with a door 22.
  • the door 22 is formed similar to the door 2, but now the outer metal tongue 23 of a trap structure 26 in cross section partially in a cavity 25 formed by a throttle profile 24 is bent into it.
  • the metal tongue 23 is thus bent or bent in cross section.
  • the throttle 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 continuous along the direction perpendicular to the sheet plane profile direction or be formed not interrupted.
  • the metal tongues 10 and / or 23 may be comb-like or tooth-like along the profile direction.
  • 3 shows a sectional side view of a section of a microwave cooking appliance 31 according to a third embodiment with a door 32.
  • the door 32 is similar to the door 2 formed, but now the inner metal tongue 33 of a trap structure 36 in cross section partially in a formed by a throttle profile 34 cavity 35 is bent into it.
  • both metal tongues can be bent into the cavity.
  • the outer metal tongue 1 1 of the trap structure 6 is toothed in a profile direction P with a series of teeth 44 or provided, which are separated by rectilinear separation slots 45.
  • the teeth 44 each have a rectangular shape with a width in the profile direction P of 4 mm, while the separation slots 45 have a width of 2 mm.
  • FIG. 5 shows in a view similar to Figure 4, the microwave cooking device 21 according to its second variant.
  • the door 22 has for this purpose an outer metal tongue 23 with teeth 54, which are separated by separating slots 55 from each other.
  • the teeth 54 are off bent in the direction of the cavity 25 of the throttle profile 24, namely around a profile direction P extending bending line B. This can also be expressed so that the teeth 54 on or along a side adjacent to the microwave entrance slot 12 side 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 exemplary embodiment.
  • a door 62 is formed similar to the door 42, but now the outer metal tongue 63 of a latch structure 67 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 perpendicular to the profile direction P extending Bending line C. This may also be expressed as the teeth 64 are bent towards the cavity 65 at at least one side adjacent a separating slot 68.
  • FIG. 7 shows, in a view similar to FIG. 4, a microwave cooking appliance 71 according to a fifth exemplary embodiment.
  • a door 72 is formed similarly to the door 42, but now the outer metal tongue 73 has teeth 74 which have an elliptical ring shape. The teeth 74 here all have a respective interruption 76 at their end facing the microwave entry slot 75.
  • the interruptions may be present in other variants at other locations of the teeth, possibly at profile different direction.
  • the annular teeth may be uninterrupted in one variant. Except for the connection of the elliptical teeth 74 with the rest of the trap structure 77 via respective webs shown in Fig. 7, the teeth 74 may e.g. be connected (Fig. Via a common continuous web or even seamlessly in direct connection with the trap structure 77 are, in particular with the throttle profile 78 or with the parallel overlap region 15th
  • the trap structure 77 with elliptical teeth 74 compensates the effect of an obliquely incident electromagnetic wave even more effectively than the non-annular trap structures 6, 26, 36, 46, 56 and 67.
  • 8 shows a plot of attenuation in dB on the y-axis against a frequency in GHz on the x-axis of a microwave oven with characteristic attenuation curves F1 and F2 for the prior art DE 102 56 624 B4 and with characteristic attenuation curves F3 and F4 for a quarter-wave trap according to the present invention, eg according to the embodiment according to FIG.
  • the damping 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 matched to an operating frequency of a microwave cooking appliance.
  • the door gap will assume different sizes, the broadening of which represents the critical case.
  • the causes are manifold and can be based, for example, on manufacturing tolerances or on thermal movements of the device during heating processes. In real use, above all, this change in the door gap as well as different angles of incidence ⁇ of the microwave radiation contribute to an undesired change in the shielding properties.
  • a lambda-quarter trap then particularly reliably shields microwave leakage radiation if, owing to its structure, it is particularly insensitive to changes, in particular enlargements, in the door gap.
  • An increased stability to changes is primarily due to a smaller change in the damping characteristic - in particular a small shift in the frequency position of the maximum damping.
  • the damping curves F2 and F4 show the case of a 1 mm wider (i.e., a total of 2 mm wide) door gap.
  • the damping properties are practically the same.
  • the positions of maximum attenuation are at the same microwave frequency of about 2.455 GHz.
  • the damping curve F4 of the quarter-wave trap according to the present invention advantageously has a noticeably smaller shift of the frequency position of the maximum damping than the damping curve F2 according to the prior art.
  • 9 shows a plot of a frequency shift of the position of the maximum attenuation in GHz on the y-axis against an enlargement of the door gap in mm on the x-axis for the prior art DE 102 56 624 B4 (curve G1) and for the lambda - Quarter-trap from Fig.8 (curve G2).
  • the ideal frequency of action shifts significantly more with enlargement of the door gap than in the quarter-wave trap according to the present invention.
  • the fact that the quarter-wave trap according to the present invention responds less to changes in the door gap means that a larger door opening is possible before the leakage radiation reaches an inadmissibly high value.
  • greater stability against u.a. given thermal movement and manufacturing tolerances which, among other things, has significant advantages for the production process.
  • the trap structure 77 of FIG. 7 with elliptical or generally ring-shaped toothing compensates the effect of an obliquely incident electromagnetic microwave 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 may also be bent into a cavity and / or different types of teeth may be present on a metal tongue, etc.
  • on may be taken to mean a singular or a plurality, in particular in the sense of “at least one” or “one or more”, etc., as long as this is not explicitly excluded, eg by the expression “exactly a ", etc. Also, a number can include exactly the specified number as well as a usual tolerance range, as long as this is not explicitly excluded.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

Appareil de cuisson à micro-ondes (71) comprenant une porte (72) qui, dans l'état fermé, recouvre l'ouverture de chargement (3) d'une chambre de cuisson (4) et une structure de piège profilée (77), laquelle forme avec une bride de porte (7) électriquement conductrice un piège quart d'onde sur la périphérie de l'ouverture de chargement (3), la structure de piège comprenant un profilé de bobine d'arrêt (78) métallique comprenant un côté ouvert (9) opposé à la bride de porte, une languette métallique (10) interne faisant saillie latéralement vers l'intérieur dans le côté ouvert et une languette métallique (73) externe faisant saillie latéralement vers l'extérieur étant connectées électriquement au profilé de bobine d'arrêt et étant séparées l'une de l'autre par une fente d'entrée de micro-ondes (75), le profilé de bobine d'arrêt étant compris dans une zone de chevauchement parallèle (15) saillante en direction de la bride de porte, laquelle comprend une surface de recouvrement (16) en matériau électriquement conducteur faisant face à la bride de porte, de forme similaire à celle de la zone recouverte de la bride de porte et espacée par rapport à la bride de porte. L'invention est en particulier applicable à des appareils ménagers à micro-ondes, par exemple à des appareils de cuisson ou fours à micro-ondes autonomes et/ou à des appareils de cuisson à vapeur comprenant une fonction micro-ondes.
EP18729969.8A 2017-06-26 2018-06-08 Appareil de cuisson à micro-ondes comprenant un piège quart d'onde Active EP3646672B1 (fr)

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 (fr) 2017-06-26 2018-06-08 Appareil de cuisson à micro-ondes comprenant un piège quart d'onde

Publications (2)

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

Family

ID=62563166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18729969.8A Active EP3646672B1 (fr) 2017-06-26 2018-06-08 Appareil de cuisson à micro-ondes comprenant un piège quart d'onde

Country Status (6)

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

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JPS50150942A (fr) 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 (fr) 1984-10-15 1986-05-16
US4742201A (en) * 1984-11-20 1988-05-03 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
EP2775794B1 (fr) 2013-03-04 2018-12-26 Electrolux Appliances Aktiebolag Porte pour appareil à micro-ondes
DE102014224053A1 (de) 2014-11-25 2016-05-25 BSH Hausgeräte GmbH Haushaltsgargerät

Also Published As

Publication number Publication date
US11265976B2 (en) 2022-03-01
WO2019001932A1 (fr) 2019-01-03
CN110754138A (zh) 2020-02-04
EP3646672B1 (fr) 2022-03-02
CN110754138B (zh) 2022-06-24
US20210092807A1 (en) 2021-03-25
DE102017210730A1 (de) 2018-12-27
PL3646672T3 (pl) 2022-05-09

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