EP0049817A1 - 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 PDFInfo
- Publication number
- EP0049817A1 EP0049817A1 EP81107757A EP81107757A EP0049817A1 EP 0049817 A1 EP0049817 A1 EP 0049817A1 EP 81107757 A EP81107757 A EP 81107757A EP 81107757 A EP81107757 A EP 81107757A EP 0049817 A1 EP0049817 A1 EP 0049817A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- door
- damping chamber
- boiler room
- width
- chamber
- 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
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 title claims description 7
- 238000013016 damping Methods 0.000 claims abstract description 31
- 238000007373 indentation Methods 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
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 seal for preventing the escape of microwaves at one of the edges of a door on a microwave heater.
- the aim of the present invention is to provide a better microwave seal with a reduction in manufacturing costs and a saving in weight by reducing the thickness of a door that has a damping chamber forming at its edge with the inner wall of the boiler room and for this purpose with the door closed in the boiler room Protrudes into the heater.
- the internal temperature must be brought up to about 500 ° C. This requires a thicker door on the device compared to conventional heaters in order to guarantee adequate heat insulation.
- the object of the invention is to provide a door construction for microwave heaters with a smaller thickness than the sum of heat insulation and coordinated damping chamber, which can be manufactured easily and cheaply, has a reduced weight and nevertheless guarantees an increased seal against microwave leakage.
- the width of the indentation in the area of the door is kept wider than that Width of the damping chamber that remains in the boiler room.
- the invention makes it possible to keep the door for a microwave heating device thinner with a good microwave seal if the indentation is kept wider than the width of the damping chamber (which penetrates into the heating chamber) + the distance of the damping chamber from the inner wall of the heating chamber.
- 1, 1 denotes the interior of a microwave oven, in which microwaves are fed in by 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 ver through this be closed.
- 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 engages in 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 according to the depth the indentation 13.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Electric Ovens (AREA)
Abstract
Die Erfindung bezieht sich auf eine Abdichtung an der Türe eines Mikrowellenheizgerätes zur dielektrischen Aufheizung eines Gutes durch Hochfrequenzenergie mit einer Dämpfungskammer (6) an der Türe zur Dämpfung des Austrittes von Mikrowellen, wobei die Dämpfungskammer in dem Heizraum zu liegen kommt, wenn die Ofentüre geschlossen ist. Ein Bereich der Dämpfungskammer wird durch eine innerhalb der Ofentüre angeordnete Einbuchtung (13) gebildet, so daß die in den Heizraum eindringende Dämpfungskammer schmäler gehalten werden kann, in einem den Abmessungen der Einbuchtung in der Türe entsprechendem Verhältnis. Die Breite W' der innerhalb der Türe gebildeten Einbuchtung ist breiter als die Breite der Dämpfungskammer, die in den Heizraum eindringt.The invention relates to a seal on the door of a microwave heating device for the dielectric heating of a good by radio frequency energy with a damping chamber (6) on the door for damping the exit of microwaves, the damping chamber coming to rest in the heating chamber when the furnace door is closed . A region of the damping chamber is formed by an indentation (13) arranged inside the furnace door, so that the damping chamber penetrating into the heating chamber can be kept narrower, in a ratio corresponding to the dimensions of the indentation in the door. The width W 'of the indentation formed inside the door is wider than the width of the damping chamber which penetrates into the boiler room.
Description
Die vorliegende Erfindung bezieht sich auf eine Abdichtung zum Verhindern des Austrittes von Mikrowellen an einer der Kanten einer Türe an einem Mikrowellenheizgerät. Ziel der vorliegenden Erfindung ist es dabei, eine bessere Mikrowellenabdichtung bei einer Reduktion der Herstellkosten und einer Einsparung des Gewichtes durch Verringern der Dicke einer Türe, die an ihrem Rand eine mit der Innenwandung des Heizraumes bildende Dämpfungskammer aufweist und hierzu bei geschlossener Türe in den Heizraum des Heizgerätes hineinragt, zu erreichen.The present invention relates to a seal for preventing the escape of microwaves at one of the edges of a door on a microwave heater. The aim of the present invention is to provide a better microwave seal with a reduction in manufacturing costs and a saving in weight by reducing the thickness of a door that has a damping chamber forming at its edge with the inner wall of the boiler room and for this purpose with the door closed in the boiler room Protrudes into the heater.
Bei üblichen Mikrowellenheizgeräten, mit zusätzlichen elektrischen Heizelementen,über die auch eine pyrolytische Selbstreinigung durchgeführt wird, muß die Innentemperatur bis auf etwa 500°C gebracht werden. Dies erfordert eine dickere Türe am Gerät im Vergleich bei üblichen Heizgeräten, um eine ausreichende Hitzeisolierung zu garantieren.In conventional microwave heating devices with additional electrical heating elements, via which pyrolytic self-cleaning is also carried out, the internal temperature must be brought up to about 500 ° C. This requires a thicker door on the device compared to conventional heaters in order to guarantee adequate heat insulation.
Der Einsatz einer heute üblichen Mikrowellenabdichtungskonstruktion, wie oben erwähnt und in Fig. 1 im Grundaufbau mit einer Dämpfungskammer, die in den Heizraum hineinragt, bedeutet einen zusätzlichen Raumbedarf und Verkleinerung des ausnutzbaren Innenraumes des Heizgerätes, da die Dämpfungskammer ein Viertel der Wellenlänge der verwendeten Hochfrequenzenergie oder ungefähr 30mm benötigt. Durch die Kombination dieser Maßnahmen muß die Dicke der Türe beträchtlich erhöht werden, was die Türe selbst relativ schwer und deshalb die Türe und die Türträgerkonstruktion relativ teuer macht. Eine Reduzierung der Länge der Dämpfungskammer würde eine Verringerung der Türdicke ermöglichen, aber dies würde zu einem erhöhten Austreten von Mikrowellen führen.The use of a microwave sealing construction which is customary today, as mentioned above and in FIG. 1 in the basic construction with a damping chamber which projects into the boiler room, means an additional space requirement and a reduction in the usable interior space of the heater, because the attenuation chamber needs a quarter of the wavelength of the radio frequency energy used or about 30mm. By combining these measures, the thickness of the door must be increased considerably, which makes the door itself relatively heavy and therefore makes the door and the door support structure relatively expensive. Reducing the length of the damping chamber would allow door thickness to be reduced, but this would result in increased microwave leakage.
Aufgabe der Erfindung ist es, eine Türkonstruktion für Mikrowellenheizgeräte mit einer geringeren Dicke als durch die Summe von Hitzeisolierung und abgestimmter Dämpfungskammer bedingt, anzugeben, die einfach und billig gefertigt werden kann, ein reduziertes Gewicht aufweist und trotzdem eine erhöhte Abdichtung gegen Mikrowellenaustritt garantiert.The object of the invention is to provide a door construction for microwave heaters with a smaller thickness than the sum of heat insulation and coordinated damping chamber, which can be manufactured easily and cheaply, has a reduced weight and nevertheless guarantees an increased seal against microwave leakage.
Diese Aufgabe wird mit einer Abdichtung für die Türe eines Mikrowellenheizgerätes mit den Merkmalen des Anspruches 1 gelöst. Vorteilhafte Dimensionierungen und Weiterbildungen sind Gegenstand der Unteransprüche.This object is achieved with a seal for the door of a microwave heater with the features of claim 1. Advantageous dimensions and further developments are the subject of the dependent claims.
Eine Abdichtung entsprechend der Erfindung für die Türe eines Heizraumes für ein Mikrowellenheizgerät mit einem Hochfrequenzozsillator zur Speisung von Hochfrequenzenergie in den Heizraum, wobei die Türe zum öffnen und Schließen der Vorderseite des Heizraumes eine Dämpfungskammer aufweist, die mit der Innenwandung des Heizraumes zusammenwirkt, weist also im Bereich der Dämpfungskammer eine Einbuchtung innerhalb der Türe auf, so daß die Tiefe der Dämpfungskammer, die in dem Heizraum wirksam ist, entsprechend reduziert ist. Die Breite der Einbuchtung im Bereich der Türe ist dabei breiter gehalten als die Breite der Dämpfungskammer, die im Heizraum verbleibt.A seal according to the invention for the door of a boiler room for a microwave heating device with a high-frequency oscillator for supplying high-frequency energy into the boiler room, the door for opening and closing the front of the boiler room having a damping chamber which interacts with the inner wall of the boiler room, so indicates Area of the damping chamber an indentation within the door, so that the depth of the damping chamber, which is effective in the boiler room, is reduced accordingly. The width of the indentation in the area of the door is kept wider than that Width of the damping chamber that remains in the boiler room.
Durch diese Maßnahmenermöglicht die Erfindung die Türe für ein Mikrowellenheizgerät bei guter Mikrowellenabdichtung dünner zu halten, wenn die Einbuchtung breiter gehalten ist als die Breite der Dämpfungskammer (die in den Heizraum eindringt) + dem Abstand der Dämpfungskammer von der Heizrauminnenwand.By means of these measures, the invention makes it possible to keep the door for a microwave heating device thinner with a good microwave seal if the indentation is kept wider than the width of the damping chamber (which penetrates into the heating chamber) + the distance of the damping chamber from the inner wall of the heating chamber.
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.
- 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 is 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 Hochfrequenzozsillator 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 by a
Die Bezugszeichen 7 und 8 bezeichnen elektrische Heizelemente, 9 einen Lüfter zum Umwälzen der heißen Luft und 10 einen Motor zum Antreiben des Lüfters.
In Fig. 2 ist in einer vergrößerten Teil-Schnittdarstellung 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
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 Dämpfmgskammer 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
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
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 according to FIG. 4 shows measurement results between comparable structures with W '= 10 mm and W' = 12mm with 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. The graphic shows that the emission of microwave energy at W '= 12 mm is only about half to a third as large as at W' = 10 mm.
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55138942A JPS6047716B2 (en) | 1980-10-03 | 1980-10-03 | High frequency heating device |
| JP138942/80 | 1980-10-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0049817A1 true EP0049817A1 (en) | 1982-04-21 |
| EP0049817B1 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4584447A (en) * | 1982-08-25 | 1986-04-22 | Matsushita Electric Industrial Co., Ltd. | 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4102041A (en) * | 1977-03-28 | 1978-07-25 | Amana Refrigeration, Inc. | Method of making microwave oven seal structure |
| DE2833040A1 (en) * | 1977-08-01 | 1979-02-22 | Bosch Siemens Hausgeraete | MICROWAVE OVEN WITH DRAWER-LIKE DOOR |
| DE2844535A1 (en) * | 1977-10-14 | 1979-04-19 | Bosch Siemens Hausgeraete | HF heated oven with microwave trap - which is near edge of oven and covered by flexible seal acting as radiation screen |
Family Cites Families (7)
| 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 |
| 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 |
-
1980
- 1980-10-03 JP JP55138942A patent/JPS6047716B2/en not_active Expired
-
1981
- 1981-09-28 AU AU75716/81A patent/AU547983B2/en not_active Ceased
- 1981-09-30 US US06/307,361 patent/US4449025A/en not_active Expired - Fee Related
- 1981-09-30 EP EP81107757A patent/EP0049817B1/en not_active Expired
- 1981-09-30 DE DE8181107757T patent/DE3174510D1/en not_active Expired
- 1981-10-02 CA CA000387173A patent/CA1174288A/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4102041A (en) * | 1977-03-28 | 1978-07-25 | Amana Refrigeration, Inc. | Method of making microwave oven seal structure |
| DE2813312A1 (en) * | 1977-03-28 | 1978-10-05 | Amana Refrigeration Inc | METHOD FOR PRODUCING A RESONANCE THROTTLE MICROWAVE TRAP AND IN PARTICULAR RESONANCE THROTTLE MICROWAVE TRAP MANUFACTURED BY SUCH A PROCESS, PRIORLY FOR MICROWAVE OVENS |
| DE2833040A1 (en) * | 1977-08-01 | 1979-02-22 | Bosch Siemens Hausgeraete | MICROWAVE OVEN WITH DRAWER-LIKE DOOR |
| FR2399780A1 (en) * | 1977-08-01 | 1979-03-02 | Bosch Siemens Hausgeraete | MICROWAVE OVEN WITH A DRAWER TYPE DOOR |
| DE2844535A1 (en) * | 1977-10-14 | 1979-04-19 | Bosch Siemens Hausgeraete | HF heated oven with microwave trap - which is near edge of oven and covered by flexible seal acting as radiation screen |
Also Published As
| Publication number | Publication date |
|---|---|
| US4449025A (en) | 1984-05-15 |
| JPS6047716B2 (en) | 1985-10-23 |
| AU7571681A (en) | 1982-04-08 |
| JPS5763795A (en) | 1982-04-17 |
| AU547983B2 (en) | 1985-11-14 |
| DE3174510D1 (en) | 1986-06-05 |
| EP0049817B1 (en) | 1986-04-30 |
| CA1174288A (en) | 1984-09-11 |
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