EP0049817B1 - Microwave heating apparatus with door sealing for preventing leakage of microwaves - Google Patents

Microwave heating apparatus with door sealing for preventing leakage of microwaves Download PDF

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Publication number
EP0049817B1
EP0049817B1 EP81107757A EP81107757A EP0049817B1 EP 0049817 B1 EP0049817 B1 EP 0049817B1 EP 81107757 A EP81107757 A EP 81107757A EP 81107757 A EP81107757 A EP 81107757A EP 0049817 B1 EP0049817 B1 EP 0049817B1
Authority
EP
European Patent Office
Prior art keywords
door
chamber
heating
choke
width
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.)
Expired
Application number
EP81107757A
Other languages
German (de)
French (fr)
Other versions
EP0049817A1 (en
Inventor
Nobuo Ikeda
Hirofumi Yoshimura
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.)
BOSCH-SIEMENS HAUSGERAETE GMBH
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0049817A1 publication Critical patent/EP0049817A1/en
Application granted granted Critical
Publication of EP0049817B1 publication Critical patent/EP0049817B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • H05B6/763—Microwave radiation seals for doors

Definitions

  • the invention relates to a microwave heater with a seal on the door consisting of a boiler room, a high-frequency oscillator for feeding high-frequency energy into the boiler room, a door for opening and closing the front opening of the boiler room and a damping chamber in the door, the damping chamber being designed in this way that it extends into the boiler room and is delimited by an outer surface, between which and the inner wall of the door a gap remains parallel to which the elongated damping chamber extends, with the damping chamber having the door part projecting into the boiler room an outside of the boiler room connected door part, which lies on the inside of the door at the front opening of the boiler room.
  • the appliance door has a so-called microwave shield which projects into the heating chamber when the door is closed and which has a damping chamber with a length of a quarter of the wavelength of the high-frequency energy used or approximately 30 mm. This reduces the usable heating chamber space.
  • This damping chamber is adjoined by a door seal which, particularly in the presence of resistance heating elements in the heating chamber, but especially when pyrolytic self-cleaning agents are present, must be of considerable strength. This results in a considerable thickness of the door and a relatively large weight.
  • the damping chamber extends parallel to a gap between the circumference of the microwave shield and the heating chamber wall.
  • the invention has for its object to reduce the thickness of the door structure including the door part having the damping chamber without reducing the microwave tightness.
  • the indentation protrudes into the interior of the outer door part and protrudes beyond the inside of the door, it is possible to reduce the overall thickness of the door, a good microwave seal being obtained by the width of the indentation being greater than the inside width of the damping chamber perpendicular to the Longitudinal direction plus the clear width of the gap.
  • 1, 1 denotes the interior of a microwave oven, in which microwaves are fed in from a magnetron 2 as a high-frequency oscillator via a waveguide 3.
  • the radiation and distribution of the microwaves within the boiler room 1 takes place by means of a rotating antenna 4, which is provided at the top in the central region of the boiler room.
  • the front of the boiler room is accessible via an oven door 5 and can be closed by this.
  • the oven door 5 is provided with a damping chamber 6, which is designed such that it comes to rest in the boiler room when the door 5 is closed.
  • Reference numerals 7 and 8 denote electrical heating elements, 9 a fan for circulating the hot air and 10 a motor for driving the fan.
  • Fig. 2 the essential portion of the improvement of the seal according to the invention is shown in an enlarged partial sectional view, 11 denotes the inner wall surface of the boiler room and 12 the front wall.
  • FIG. 3 The usual structure of a damping chamber 6 on the door 5 is shown in FIG. 3. The full depth of the damping chamber reaches into the boiler room when the door is closed.
  • an area of the damping chamber is formed by an indentation 13 in the inside of the door, as a result of which the part of the damping chamber located in the heating chamber can be reduced and thus the thickness of the door can be reduced in accordance with the depth the indentation 13.

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

Description

Die Erfindung bezieht sich auf ein Mikrowellenheizgerät mit Abdichtung an der Tür bestehend aus einem Heizraum, einem Hochfrequenzoszillator zur Einspeisung von Hochfrequenzenergie in den Heizraum, einer Tür zum Öffnen und Schließen der Frontöffnung des Heizraumes und einer Dämpfungskammer in der Tür, wobei die Dämpfungskammer so ausgebildet ist, daß sie in den Heizraum hineinreicht und durch eine Außenfläche begrenzt ist, zwischen der und der Innenwandung der Tür ein Spalt verbleibt parallel zu dem sich die langgestreckte Dämpfungskammer erstreckt, wobei sich an den die Dämpfungskammer aufweisenden, in den Heizraum hineinragenden Türteil ein außerhalb des Heizraumes liegender Türteil anschließt, der mit einer Tür-Innenseite an der Frontöffnung des Heizraumes anliegt.The invention relates to a microwave heater with a seal on the door consisting of a boiler room, a high-frequency oscillator for feeding high-frequency energy into the boiler room, a door for opening and closing the front opening of the boiler room and a damping chamber in the door, the damping chamber being designed in this way that it extends into the boiler room and is delimited by an outer surface, between which and the inner wall of the door a gap remains parallel to which the elongated damping chamber extends, with the damping chamber having the door part projecting into the boiler room an outside of the boiler room connected door part, which lies on the inside of the door at the front opening of the boiler room.

Bei einem bekannten Mikrowellenheizgerät (DE-A-28 44 535) besitzt die Gerätetür einen sogenannten Mikrowellenschild, der bei geschlossener Tür in die Heizkammer hineinragt und der eine Dämpfungskammer aufweist mit einer Länge von einem Viertel der Wellenlänge der verwendeten Hochfrequenzenergie oder ungefähr 30mm. Dadurch wird der nutzbare Heizkammerraum reduziert. An diese Dämpfungskammer schließt sich an eine Türdichtung, die insb. bei Vorhandensein von Widerstandsheizelementen in der Heizkammer, insb. aber bei Vorhandensein von Mitteln zur pyrolytischen Selbstreinigung, eine beträchtliche Stärke aufweisen muß. Hieraus ergibt sich eine beträchtliche Dicke der Tür und damit verbunden ein relativ großes Gewicht. Bei diesem bekannten Mikrowellenheizgerät erstreckt sich die Dämpfungskammer parallel zu einem Spalt zwischen dem Umfang des Mikrowellenschildes und der Heizkammerwand.In a known microwave heating device (DE-A-28 44 535), the appliance door has a so-called microwave shield which projects into the heating chamber when the door is closed and which has a damping chamber with a length of a quarter of the wavelength of the high-frequency energy used or approximately 30 mm. This reduces the usable heating chamber space. This damping chamber is adjoined by a door seal which, particularly in the presence of resistance heating elements in the heating chamber, but especially when pyrolytic self-cleaning agents are present, must be of considerable strength. This results in a considerable thickness of the door and a relatively large weight. In this known microwave heating device, the damping chamber extends parallel to a gap between the circumference of the microwave shield and the heating chamber wall.

Der Erfindung liegt die Aufgabe zugrunde, die Dicke der Türkonstruktion einschließlich dem die Dämpfungskammer aufweisenden Türteil zu reduzieren ohne Verminderung der Mikrowellendichtheit.The invention has for its object to reduce the thickness of the door structure including the door part having the damping chamber without reducing the microwave tightness.

Diese Aufgabe wird gelöst durch die im Kennzeichnungsteil des Patentanspruches 1 angegebenen Maßnahmen. Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Patentansprüchen.This object is achieved by the measures specified in the characterizing part of patent claim 1. Advantageous developments of the invention result from the following patent claims.

Dadurch, daß die Einbuchtung in das Innere des äußeren Türteils hineinragt und die Türinnenseite hinterragt besteht die Möglichkeit, die Dicke der Tür insgesamt zu reduzieren, wobei eine gute Mikrowellenabdichtung erhalten wird, indem die Breite der Einbuchtung größer ist als die lichte Weite der Dämpfungskammer senkrecht zur Längsrichtung zuzüglich der lichten Weite des Spaltes.Characterized in that the indentation protrudes into the interior of the outer door part and protrudes beyond the inside of the door, it is possible to reduce the overall thickness of the door, a good microwave seal being obtained by the width of the indentation being greater than the inside width of the damping chamber perpendicular to the Longitudinal direction plus the clear width of the gap.

Einzelheiten der Erfindung werden im folgenden in Verbindung mit den anliegenden Zeichnungen erläutert. In diesen Zeichnungen zeigen:

  • Fig. 1 einen Längsschnitt durch einen Mikrowellenherd mit zusätzlichen elektrischen Heizelementen, mit einer Türabdichtkonstruktion gemäß der Erfindung,
  • Fig. 2 in einer vergrößerten Teil- Schnittansicht den Grundaufbau der Türabdichtungskonstruktion,
  • Fig. 3 in einer vergrößerten Teil-Schnittansicht eine herkömmliche Türabdichtkonstruktion und
  • Fig. 4 eine Grafik zur Erläuterung der erreichten Ergebnisse.
Details of the invention are explained below in conjunction with the accompanying drawings. In these drawings:
  • 1 shows a longitudinal section through a microwave oven with additional electrical heating elements, with a door sealing construction according to the invention,
  • 2 is an enlarged partial sectional view of the basic structure of the door sealing structure,
  • Fig. 3 in an enlarged partial sectional view of a conventional door sealing structure and
  • Fig. 4 is a graph to explain the results achieved.

In der Darstellung nach Fig. 1 ist mit 1 der Innenraum eines Mikrowellenherdes bezeichnet, in welchem Mikrowellen von einem Magnetron 2 als Hochfrequenzoszillator über einen Wellenleiter 3 eingespeist werden. Die Abstrahlung und Verteilung der Mikrowellen innerhalb des Heizraumes 1 erfolgt mittels einer rotierenden Antenne 4, welche oben im mittleren Bereich des Heizraumes vorgesehen ist. Die Vorderseite des Heizraumes ist über eine Ofentüre 5 zugänglich und kann durch diese verschlossen werden. Die Ofentüre 5 ist mit einer Dämpfungskammer 6 vorgesehen, die derart ausgebildet ist, daß sie in den Heizraum zu liegen kommt, wenn die Türe 5 geschlossen ist.1, 1 denotes the interior of a microwave oven, in which microwaves are fed in from a magnetron 2 as a high-frequency oscillator via a waveguide 3. The radiation and distribution of the microwaves within the boiler room 1 takes place by means of a rotating antenna 4, which is provided at the top in the central region of the boiler room. The front of the boiler room is accessible via an oven door 5 and can be closed by this. The oven door 5 is provided with a damping chamber 6, which is designed such that it comes to rest in the boiler room when the door 5 is closed.

Die Bezugszeichen 7 und 8 bezeichnen elektrische Heizelemente, 9 einen Lüfter zum Umwälzen der heißen Luft und 10 einen Motor zum Antreiben des Lüfters.Reference numerals 7 and 8 denote electrical heating elements, 9 a fan for circulating the hot air and 10 a motor for driving the fan.

In Fig. 2 ist in einer vergrößerten TeilSchnittdarstellung der wesentliche Abschnitt der Verbesserung der Abdichtung nach der Erfindung dargestellt, wobei mit 11 die innere Wandfläche des Heizraumes und mit 12 die Vorderwand bezeichnet ist.In Fig. 2, the essential portion of the improvement of the seal according to the invention is shown in an enlarged partial sectional view, 11 denotes the inner wall surface of the boiler room and 12 the front wall.

Der übliche Aufbau einer Dämpfungskammer 6 an der Türe 5 ist in Fig. 3 gezeigt. Die Dämpfungskammer greift in ihrer vollen Tiefe in den Heizraum ein, wenn die Türe geschlossen ist.The usual structure of a damping chamber 6 on the door 5 is shown in FIG. 3. The full depth of the damping chamber reaches into the boiler room when the door is closed.

Bei dem in Fig. 2 dargestellten Ausführungsfall der Erfindung wird ein Bereich der Dämpfungskammer durch eine Einbuchtung 13, in der Innenseite der Türe gebildet, wodurch der in dem Heizraum befindliche Teil der Dämpfungskammer verkleinert und damit die Dicke der Türe reduziert werden kann, entsprechend der Tiefe der Einbuchtung 13.In the embodiment of the invention shown in FIG. 2, an area of the damping chamber is formed by an indentation 13 in the inside of the door, as a result of which the part of the damping chamber located in the heating chamber can be reduced and thus the thickness of the door can be reduced in accordance with the depth the indentation 13.

Obwohl eine einfache Reduzierung der Dicke der Türe den Grad des Austretens von Mikrowellen erhöhen würde, wurde gefunden, daß die Dichtwirkung gegen Austritt von Mikrowellen verbessert werden kann auch bei einer Türe mit reduzierter Dicke, wenn die Beziehung zwischen der Breite W' der Einbuchtung 13, der Breite W der Dämpfungskammer und einem lichten Abstand G zwischen der Dämpfungskammer und der inneren Wandoberfläche des Heizraumes so gewählt wird, daß W' > W + G ist.Although a simple reduction in the thickness of the door would increase the degree of microwave leakage, it has been found that the sealing effect against microwave leakage can also be improved for a door with reduced thickness if the relationship between the width W 'of the indentation 13, the width W of the damping chamber and a clear distance G between the damping chamber and the inner wall surface of the boiler room is chosen so that W '> W + G.

Die Grafik nach Fig. 4 gibt Meßergebnisse wieder, die von vergleichbaren Aufbauten mit W' = 10 mm und W' = 12mm bei W = 8 mm und G = 2,5 mm mit einer lichten Weite von etwa 4,5 bis 6 mm zwischen der Türe und der Vorderwandoberfläche des Ofens, durchgeführt wurden. Die Grafik zeigt, daß der Austritt von Mikrowellenenergie bei W' = 12 mm nur etwa Halb bis ein Drittel so groß ist wie bei W' = 10 mm.The graph of FIG. 4 shows measurement results between comparable structures with W '= 10 mm and W' = 12mm at W = 8 mm and G = 2.5 mm with a clear width of about 4.5 to 6 mm between the door and the front wall surface of the furnace were. The graphic shows that the emission of microwave energy at W '= 12 mm is only about half to one third as large as at W' = 10 mm.

Claims (2)

1. Micro-wave-heating-appliance with a sealing device on the ovendoor consisting of a heating chamber (1), a high-frequency-oscillator (2) for providing high-frequency-energy into the heatingchamber (1), a door (5) for opening and closing the front side of the heating-chamber and a choke chamber (6) in the door, whereby the choke chamber is formed in that manner, that it projects into the heating chamber and is bounded by an outsurface, between which and the inner wall of the door a gap exists to which the choke chamber elongated extends parallel, whereby on the part of the door having the choke chamber and projecting into the heating-chamber joins a part of the door being located outside of the heating-chamber, which borders with a door inner surface on the front opening of the heating chamber, characterized in that the choke chamber is elongated in longitudinal direction as a recess (13) projecting into the interior of the outer part of the door and behind the inner surface of the door, which recess has a width (W') larger as the inside width (W) of the choke chamber vertical to the lonitudinal direction with the addition of theinside width (G) of the gap.
2. Micro-wave-heating-appliance according to claim 1, characterized in that at a width W = 8 mm of the choke chamber and a distance G = 2,5 mm between the choke chamber and the heating- chamber inside wall, the recess is chosen in a width W' = 12 mm."Fr
EP81107757A 1980-10-03 1981-09-30 Microwave heating apparatus with door sealing for preventing leakage of microwaves Expired EP0049817B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP138942/80 1980-10-03
JP55138942A JPS6047716B2 (en) 1980-10-03 1980-10-03 High frequency heating device

Publications (2)

Publication Number Publication Date
EP0049817A1 EP0049817A1 (en) 1982-04-21
EP0049817B1 true EP0049817B1 (en) 1986-04-30

Family

ID=15233746

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107757A Expired EP0049817B1 (en) 1980-10-03 1981-09-30 Microwave heating apparatus with door sealing for preventing leakage of microwaves

Country Status (6)

Country Link
US (1) US4449025A (en)
EP (1) EP0049817B1 (en)
JP (1) JPS6047716B2 (en)
AU (1) AU547983B2 (en)
CA (1) CA1174288A (en)
DE (1) DE3174510D1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE33657E (en) * 1982-08-25 1991-08-06 Matsushita Electric Industrial Co. Electromagnetic wave energy seal arrangement
US4523069A (en) * 1983-10-24 1985-06-11 General Electric Company Microwave oven door seal
DE3644920A1 (en) * 1986-03-07 1987-12-23 Bosch Siemens Hausgeraete Microwave oven
KR950000247B1 (en) * 1989-04-06 1995-01-12 주식회사 금성사 Apparatus for shielding microwave for electronic range
GB0511459D0 (en) * 2005-06-06 2005-07-13 Glen Dimplex Home Appliances L Choke system and oven
EP2031939B1 (en) * 2007-09-03 2013-02-27 Electrolux Home Products Corporation N.V. A wave choke device for a microwave oven door
US20130228568A1 (en) * 2012-03-02 2013-09-05 Illinois Tool Works Inc. Multiple choke system for containing wide frequency band rf leakage

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668357A (en) * 1969-10-23 1972-06-06 Mitsubishi Electric Corp Microwave seal for electronic range
BE757877A (en) * 1969-10-24 1971-04-01 Amana Refrigeration Inc HYPERFREQUENCY OVEN
JPS4939571B1 (en) * 1970-04-23 1974-10-26
US3629537A (en) * 1970-09-09 1971-12-21 Matsushita Electric Ind Co Ltd Microwave oven door seal having dual cavities fed by a biplanar transmission line
US4081647A (en) * 1976-05-10 1978-03-28 Roper Corporation Energy seal for a microwave oven
US4102041A (en) * 1977-03-28 1978-07-25 Amana Refrigeration, Inc. Method of making microwave oven seal structure
CA1111505A (en) * 1977-08-01 1981-10-27 Junzo Tanaka Microwave oven having a radiation leak-proof drawer type door
JPS5463541U (en) * 1977-10-14 1979-05-04
US4358653A (en) * 1977-11-25 1982-11-09 Raytheon Company Combination microwave oven
JPS5948517B2 (en) * 1979-09-11 1984-11-27 松下電器産業株式会社 High frequency heating device

Also Published As

Publication number Publication date
DE3174510D1 (en) 1986-06-05
AU7571681A (en) 1982-04-08
JPS6047716B2 (en) 1985-10-23
JPS5763795A (en) 1982-04-17
EP0049817A1 (en) 1982-04-21
AU547983B2 (en) 1985-11-14
US4449025A (en) 1984-05-15
CA1174288A (en) 1984-09-11

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