EP2271176B1 - Système de support à ondes pour porte de four d'un four à micro-ondes - Google Patents

Système de support à ondes pour porte de four d'un four à micro-ondes Download PDF

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Publication number
EP2271176B1
EP2271176B1 EP09008660A EP09008660A EP2271176B1 EP 2271176 B1 EP2271176 B1 EP 2271176B1 EP 09008660 A EP09008660 A EP 09008660A EP 09008660 A EP09008660 A EP 09008660A EP 2271176 B1 EP2271176 B1 EP 2271176B1
Authority
EP
European Patent Office
Prior art keywords
choke
wave
recess
wave choke
cross
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.)
Not-in-force
Application number
EP09008660A
Other languages
German (de)
English (en)
Other versions
EP2271176A1 (fr
Inventor
Abdel-Ilah Zbat
Arnd Dr.-Ing. Hofmann
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to PL09008660T priority Critical patent/PL2271176T3/pl
Priority to EP09008660A priority patent/EP2271176B1/fr
Publication of EP2271176A1 publication Critical patent/EP2271176A1/fr
Application granted granted Critical
Publication of EP2271176B1 publication Critical patent/EP2271176B1/fr
Not-in-force legal-status Critical Current
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 present invention relates to a wave choke system for an oven door of a microwave oven according to the preamble of claim 1. Further, the present invention relates to an oven door for a microwave oven. Additionally, the present invention relates to a corresponding microwave oven.
  • microwave ovens are often used in order to heat food stuff and beverages.
  • the microwave ovens generate strong electromagnetic fields. Said electromagnetic fields are a potential threat to the health of the user, if the electromagnetic fields or parts of them leave the cavity of the microwave oven.
  • the oven door of the microwave oven is the most critical part. In particular, microwaves may leave the cavity through the gap between the door frame and the front frame of the cavity.
  • the gap between the oven door and the cavity is sealed with respect to microwaves by integrating wave chokes into the door frame and/or onto the cavity frame.
  • wave choke systems base on a ⁇ /4 transformation, in which the impedance at the short circuit wall can be transformed to the space at the opening situated between the wave choke part and the cavity front frame. In this way, the leakage of the microwave is prevented.
  • a wave choke recess has usually a length of ⁇ /4, wherein X is the length of the microwaves propagating into the recess.
  • Another type of microwave filter bases on an LC-resonant circuit. This kind of microwave filter is formed by the connection of inductance and capacitance. Mechanical tolerances of the cavity frame and the frame of the oven door can evoke local areas of an increased leakage.
  • the document US 4,523,069 discloses a microwave oven door seal arrangement for inhibiting microwave energy leakage.
  • An energy splitting and phase shifting device initially splits the energy between two intersecting transmission paths. The paths differ in their effective electrical lengths in a half wavelength in order to generate destructive interference.
  • the cross-section of the choke portion encloses a free end part of the cross-section of the wave choke recess
  • the choke portion comprises a plurality of open slots and lamellae arranged alternating along the longitudinal axis of the choke portion, the slots and lamellae are arranged in a free end part of the cross-section of said choke portion, said free part extends at least partially into an inner space of the wave choke recess, and another part of the choke portion is arranged outside the wave choke recess.
  • the main idea of the present invention is the two-part wave choke system, wherein two pieces are made of a conductive material and are electrically isolated from each other. This structure allows a reduced leakage and a higher bandwidth.
  • the functionality of this wave choke system is more robust against mechanical tolerances of the cavity walls and the cavity frame. The required space for the wave choke system within the door frame is relatively small.
  • the cross-section of the choke portion encloses a free end part of the cross-section of the wave choke recess.
  • the choke portion comprises a plurality of open slots and lamellae arranged alternating along the longitudinal axis of the choke portion, wherein the slots and the lamellae extend perpendicularly to said longitudinal axis of the choke portion.
  • the slots and the lamellae are arranged in a free end part of the cross-section of the choke portion.
  • the free end part with the slots and the lamellae is arranged at least partially within an inner space of the wave choke recess.
  • the choke portion is formed as a U-shaped profile part.
  • the choke portion may be formed as an L-shaped profile part. According to a further embodiment the choke portion may be formed as a C-shaped profile part.
  • the wave choke recess is formed as a U-shaped profile part enclosing a door panel.
  • the open side of the U-shaped wave choke recess may be arranged at an inner side of the oven door.
  • the wave choke recess and the door panel may be formed as a single-piece part.
  • the wave choke recess may be attached at the door panel.
  • the cover element may be formed as a C-shaped profile part, wherein the cross-section of the cover element encloses completely the cross-section of the choke portion and partially the cross-section of the wave choke recess.
  • the cover element covers the open side of the wave choke recess.
  • the cover element prevents accession of non-desirable substances into the wave choke recess.
  • the present invention relates to an oven door comprising at least one wave choke system as described above.
  • the present invention relates to a microwave oven comprising at least one wave choke system and/or one oven door as described above.
  • FIG 1 illustrates a sectional view of a wave choke system for an oven door of a microwave oven according to a preferred embodiment of the present invention.
  • FIG 1 shows a part of the oven door and a part of the oven cavity in a closed state of the oven door.
  • the wave choke system comprises a wave choke recess 10, a choke portion 12 and a cover element 14.
  • the wave choke recess 10, the choke portion 12 and the cover element 14 are formed as profile parts.
  • the wave choke system is attached at the outer portions of the oven door.
  • the wave choke system is arranged inside the door frame or forms the door frame of the oven door.
  • the oven door comprises a door panel 16 and a viewing glass 18.
  • the wave choke system is arranged in front of a cavity front frame 20.
  • the cavity front frame 20 has a Z-shaped cross-section and encloses circumferentially the frontier portion of the oven cavity.
  • the wave choke recess 10 has a substantially rectangular cross section.
  • the wave choke recess 10 is the appendix of the door panel 16 and forms the border of said door panel 16.
  • the wave choke recess 10 encloses partially or completely the door panel 16.
  • the door panel 16 and the wave choke recess 10 form a single-piece part.
  • the door panel 16 with the wave choke recess 10 is made by bending a sheet.
  • An inner recess wall 22 extends from the door panel 16 perpendicularly to the plane of said door panel 16.
  • a central recess wall 24 extends from the inner recess wall 22 perpendicularly to said inner recess wall 22 and parallel to the door panel 16.
  • An outer recess wall 26 extends from the central recess wall 24 perpendicularly to said central recess wall 24 and parallel to the inner recess wall 22.
  • the wave choke recess 10 consists of one or more separate parts being attached at the door panel 16.
  • the cross-section of the wave choke recess 10 has three closed sides 22, 24 and 26 and one open side.
  • the open side of the wave choke recess 10 is partially covered by the choke portion 12 and completely covered by the cover element 14.
  • the choke portion 12 is formed as a U-shaped profile part and encloses the outer recess wall 26 of the wave choke recess 10, wherein the open side of the U-shaped profile part faces to outer side of the oven door. In this example the choke portion 12 covers about the half width of the open side of the wave choke recess 10.
  • the cover element 14 is formed as a C-shaped profile part and encloses the central recess wall 26 and the open side of the wave choke recess 10 as well as the outer and upper portions of the choke portion 12.
  • the launch opening 28 extends parallel to the wave choke recess 10.
  • the microwaves from the oven cavity which propagates through a gap 30 between the cavity front frame 20 and the wave choke system, can intrude through the launch opening 28 into the wave choke recess 10.
  • the launch opening 28 is permeable for the microwaves.
  • the wave choke recess 10 and the choke portion 12 are made of an electrically conductive material, in particular metal.
  • the cover element 14 is made of a dielectric material, in particular plastics.
  • the wave choke recess 10 and the choke portion 12 are electrically insulated from each other. There is not any galvanic contact between the wave choke recess 10 and the choke portion 12.
  • the wave choke recess 10 is in contact with the cover element 14 at the outer side of the inner recess wall 22 and at the bottom side of the central recess wall 24.
  • the choke portion 12 is in contact with the cover element 14 at its outer side and its top side.
  • the choke portion 12 is attached within the cover element 14.
  • the cover element 14 is attached at the wave choke recess 10.
  • the wave choke recess 10 can be an extension of or adhered to the door panel 16.
  • the viewing glass 18 is attached on the door panel 16. In its central portion the door panel 16 comprises a cutout or a plurality of holes. Thus, the viewing glass 18 allows a view inside the oven cavity.
  • the viewing glass 30 is made of plastics or glass.
  • FIG 2 shows a perspective sectional view of the wave choke system according the preferred embodiment of the present invention.
  • the wave choke system includes the wave choke recess 10, the choke portion 12 and the cover element 14.
  • the oven door comprises a door panel 16 and a viewing glass 18. In the closed state of the oven door the wave choke system is arranged in front of a cavity front frame 20.
  • the choke portion 12 includes a plurality of slots 32 und lamellae 34 arranged alternating in series.
  • the slots 32 und lamellae 34 are arranged in that leg of the U-shaped choke portion 12, which extends into the wave choke recess 10.
  • the slots 32 are equally spaced apart from each other.
  • the lamellae 34 are equally spaced apart from each other.

Landscapes

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

Claims (12)

  1. Système de piège à ondes pour une porte de four d'un four à micro-ondes, ledit système de piège à ondes est réalisé pour un châssis de porte de la porte du four et comprend:
    - un évidement de piège à ondes oblong (10) réalisé en un matériau conducteur,
    - une portion de piège oblong (12) réalisée en matériau conducteur et agencée parallèlement à l'évidement de piège à ondes (10), et
    - au moins un élément de recouvrement oblong (14) réalisé en matériau diélectrique et agencé parallèlement à l'évidement de piège à ondes (10) et à la portion de piège (12), où
    - l'évidement de piège à ondes (10), la portion de piège (12) et l'élément de recouvrement (14) sont réalisés comme des parties profilées,
    - la section transversale de l'élément de recouvrement (14) renferme au moins partiellement les sections transversales de l'évidement de piège à ondes (10) et de la portion de piège (12),
    - la section transversale de la portion de piège (12) renferme une partie de la section transversale de l'évidement de piège à ondes (10), et
    - l'évidement de piège à ondes (10) et la portion de piège (12) sont isolées électriquement l'un de l'autre,
    caractérisé en ce que
    à section transversale de la portion de piège (12) renferme une partie d'extrémité libre de la section transversale de l'évidement de piège à ondes (10), la portion de piège (12) comprend une pluralité de fentes ouvertes (32) et de lamelles (34) agencées en alternance le long de l'axe longitudinal de la portion de piège (12), les fentes (32) et lamelles (34) sont agencées dans une partie d'extrémité libre de la section transversale de ladite portion de piège (12), ladite partie libre s'étend au moins partiellement dans un espace intérieur de l'évidement de piège à ondes (10), et une autre partie de la portion de piège (12) est agencée à l'extérieur de l'évidement de piège à ondes (10).
  2. Système de piège à ondes selon la revendication 1, caractérisé en ce que les fentes (32) et les lamelles (34) s'étendent perpendiculairement audit axe longitudinal de la portion de piège (12).
  3. Système de piège à ondes selon la revendication 1 ou 2, caractérisé en ce que la portion de piège (12) est réalisée comme une pièce profilée en forme de U.
  4. Système de piège à ondes selon la revendication 1 ou 2, caractérisé en ce que la portion de piège (12) est réalisée comme une pièce profilée en forme de L.
  5. Système de piège à ondes selon la revendication 1 ou 2, caractérisé en ce que la portion de piège (12) est réalisée comme une pièce profilée en forme de C.
  6. Système de piège à ondes selon l'une quelconque des revendications précédentes, caractérisé en ce que l'évidement de pièges à ondes (10) est réalisé comme une pièce profilée en forme de U renfermant un panneau de porte (16).
  7. Système de piège à ondes selon la revendication 6, caractérisé en ce que le côté ouvert de l'évidement de piège à ondes en forme de U (10) est agencé à un côté intérieur de la porte du four.
  8. Système de piège à ondes selon la revendication 6 ou 7, caractérisé en ce que l'évidement de piège à ondes (10) et le panneau de porte (16) sont réalisés comme une partie en une seule pièce ou bien l'évidement de piège à ondes (10) est fixé au panneau de porte (16).
  9. Système de piège à ondes selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément de recouvrement (14) est réalisé comme une pièce profilée en forme de C, où la section transversale de l'élément de recouvrement (14) renferme complètement la section transversale de la portion de piège (12) et partiellement la section transversale de l'évidement de piège à ondes (10).
  10. Système de piège à ondes selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément de recouvrement (14) couvre le côté ouvert de l'évidement de piège à ondes (10).
  11. Porte de four pour un four à micro-ondes, caractérisé en ce que la porte du four comprend au moins un système de piège à ondes selon l'une quelconque des revendications 1 à 10.
  12. Porte de four à micro-ondes avec au moins une porte de fours et au moins un système de piège à ondes, caractérisée en ce que le four à micro-ondes comprend au moins un système de piège à ondes selon l'une quelconque des revendications 1 à 10 et/ou une porte de four selon la revendication 11.
EP09008660A 2009-07-02 2009-07-02 Système de support à ondes pour porte de four d'un four à micro-ondes Not-in-force EP2271176B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL09008660T PL2271176T3 (pl) 2009-07-02 2009-07-02 System dławika falowego do drzwiczek kuchenki mikrofalowej
EP09008660A EP2271176B1 (fr) 2009-07-02 2009-07-02 Système de support à ondes pour porte de four d'un four à micro-ondes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09008660A EP2271176B1 (fr) 2009-07-02 2009-07-02 Système de support à ondes pour porte de four d'un four à micro-ondes

Publications (2)

Publication Number Publication Date
EP2271176A1 EP2271176A1 (fr) 2011-01-05
EP2271176B1 true EP2271176B1 (fr) 2012-06-27

Family

ID=41065977

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09008660A Not-in-force EP2271176B1 (fr) 2009-07-02 2009-07-02 Système de support à ondes pour porte de four d'un four à micro-ondes

Country Status (2)

Country Link
EP (1) EP2271176B1 (fr)
PL (1) PL2271176T3 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523069A (en) * 1983-10-24 1985-06-11 General Electric Company Microwave oven door seal
FR2653211B1 (fr) * 1989-10-13 1992-01-03 Bonnet Sa Porte pour four de cuisson d'aliments et four equipe d'une telle porte.
KR20050031286A (ko) * 2003-09-29 2005-04-06 삼성전자주식회사 전자렌지

Also Published As

Publication number Publication date
EP2271176A1 (fr) 2011-01-05
PL2271176T3 (pl) 2012-11-30

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