EP0284958A1 - Device for coupling a micro-wave field to a micro-wave oven - Google Patents

Device for coupling a micro-wave field to a micro-wave oven Download PDF

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Publication number
EP0284958A1
EP0284958A1 EP88104551A EP88104551A EP0284958A1 EP 0284958 A1 EP0284958 A1 EP 0284958A1 EP 88104551 A EP88104551 A EP 88104551A EP 88104551 A EP88104551 A EP 88104551A EP 0284958 A1 EP0284958 A1 EP 0284958A1
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EP
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Prior art keywords
coupling
microwave
waveguide
chamber
cooking
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Granted
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EP88104551A
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German (de)
French (fr)
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EP0284958B1 (en
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Jakob Heierli
Edwin Schär
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GIGATHERM AG
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GIGATHERM AG
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    • 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
    • H05B6/72—Radiators or antennas
    • 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
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/04—Heating using microwaves
    • H05B2206/044—Microwave heating devices provided with two or more magnetrons or microwave sources of other kind

Definitions

  • the invention relates to a device for coupling a microwave field to a microwave oven, the microwave field generated by at least one microwave transmitter reaching the cooking chamber of the oven via at least one waveguide, a metallically closed resonator chamber being provided between the cooking chamber and the waveguide, to which the Waveguide is connected and is connected to the cooking space via coupling openings.
  • a device for coupling a microwave field to a microwave oven, the microwave field generated by at least one microwave transmitter reaching the cooking chamber of the oven via at least one waveguide, a metallically closed resonator chamber being provided between the cooking chamber and the waveguide, to which the Waveguide is connected and is connected to the cooking space via coupling openings.
  • a field distributor (propeller or rotating antenna), which is also installed, ensures that the entire microwave field is in motion, ie that the forced the hot and cold spots that occur in the cooking space due to the physical spread of the microwave are shifted against each other and the temperature is increased to the same extent at every point.
  • Solutions are also known in which a box is built onto the cooking space, which is separated from the cooking space by a ceramic cover, possibly by a glass or plastic cover.
  • the waveguide is in each case blocked from the front of the box and the field distributor is usually mounted in this box, which is part of the cooking space with regard to the microwave field.
  • This object is achieved in that stationary coupling elements are arranged in the resonator space in order to also couple the voltage vector from the coupling direction (E z ) into the other two dimensions (E x , E y ).
  • the desired isotropic field distribution can thus be achieved even in the resonator space itself.
  • the resonator space is preferably separated from the cooking space by a metallic partition wall which has coupling openings whose dimensions are smaller than those of the partition wall and which are shaped such that the resulting voltage vectors of the microwave field are evenly coupled into the cooking space.
  • a movable field distributor is also advantageously arranged in the closed resonator space.
  • the intended resonator chamber decouples the cooking chamber from the microwave transmitter, which thus remains unaffected by the respective load in the cooking chamber and can thus be operated with optimum efficiency, with a uniform alignment of the resulting voltage vectors of the microwave field and thus uniform heating being achieved in the cooking chamber.
  • FIG. 1 shows a microwave transmitter 1 with a magnetron 4 which projects into a rectangular waveguide 2.
  • the magnetron 4 generates a microwave field, which is fed via the waveguide 2 to a cooking space 3, which is designed to receive the food.
  • the rectangular waveguide 2 is dimensioned such that the resulting voltage vector E z of the microwave field in the waveguide is perpendicular to its broad side, as indicated in FIG. 2.
  • a thin, long, electrically poorly conductive rod held parallel to the above voltage vector in the waveguide, it absorbs energy, i.e. he warms up. If it is held perpendicular to the voltage vector in the waveguide, it does not absorb any energy because the extension of the rod in the direction of the voltage vector is too small.
  • the cooking chamber 3 forms a cavity in which, in conventional arrangements, a voltage vector prevails in the direction in which it is coupled.
  • the waveguide 2 is connected to a resonator chamber 5 which is box-shaped. This is metallically sealed and connected to the cooking space 3 by coupling openings 6.
  • the coupling openings are arranged in a partition 8, which is common to the resonator chamber 5 and the cooking chamber 3.
  • the coupling openings 6, which are smaller in their dimensions than the partition 8, serve to effect the alignment of the microwave field in several directions. This can be done in several ways.
  • the slot-shaped design of the coupling openings 6 causes voltage vectors E x and E y to be coupled in, which are each perpendicular to the slot extension.
  • the coupling openings 6 can also have other shapes (round, square) and e.g. be arranged transversely in space 5 in order to influence the field in such a way that the most uniform possible distribution of microwave energy in all three dimensions is achieved in cooking space 3.
  • each coupling pin 9 is fastened to the edges of the upper cover surface of the resonator chamber 5 and project into the resonator chamber in the manner shown.
  • a movable field distributor 7 (propeller or rotary antenna) is arranged in the resonator chamber 5.
  • the multi-dimensionally distributed microwave field configured in the manner described is additionally moved in this way.
  • the field distributor 7 can also be arranged in the cooking space 3 itself.
  • FIG. 4 shows a correspondingly designed coupling device, in which two transmitters 1, 1 'are connected to a common resonator chamber 5 by means of a waveguide 2, 2', which in turn is coupled to cooking chamber 3 via coupling openings 11, 11 '.
  • the remaining parts, such as coupling elements and field distributors, are not shown in the drawing for the sake of simplicity.
  • the coupling resonator described can optionally be attached to the top or base surface of the cooking space or to one of its side surfaces.
  • the waveguide 2 opens in each case on one side 10 of the box-shaped resonator chamber 5, which abuts the partition 8 to the cooking chamber.
  • a coupling system is described with which, in addition to the better decoupling of the transmitter and the cooking space, there are also various possibilities for aligning the microwave field in all three dimensions before and during the coupling into the cooking space.
  • the field distributor also moves the microwave field in all three dimensions. This results in optimal heat distribution in the cooking space.

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

Abstract

In order to achieve better decoupling between the microwave transmitter (1) and the cooking chamber (3) in a microwave oven, the microwave field is guided by a waveguide (2) into a resonator cavity (5), which is connected to the cooking chamber (3) via injection openings (6). The resonator cavity (5) forms a metallically sealed box. As a result of the design of the injection openings (6) and the arrangement of coupling pins (9) in the resonator cavity, it is possible to direct the microwave field in all dimensions, before and during injection into the cooking chamber. In addition, a field distributor can move the microwave field in all three dimensions. An optimum heat distribution in the cooking chamber can be achieved overall. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Einkoppelung eines Mikrowellenfeldes an einem Mikro­wellenherd, wobei das von mindestens einem Mikrowellen­sender erzeugte Mikrowellenfeld über mindestens einen Hohlleiter zum Garraum des Herds gelangt, wobei zwischen dem Garraum und dem Hohlleiter ein metallisch geschlos­sener Resonatorraum vorgesehen ist, an den der Hohlleiter angeschlossen ist und der über Koppelöffnungen mit dem Garraum verbunden ist. Eine solche Vorrichtung ist aus der Publikation DE-A-3028009 bekannt. Wichtig ist bei solchen Vorrichtungen insbesondere der Uebergang vom Hohlleiter in den Garraum. Dieser Uebergang bestimmt weitgehend die optimale Feldverteilung im Garraum. Dabei möchte man möglichst erreichen, dass im Garraum an jedem Punkt genau dieselbe Erwärmung stattfindet. Diese An­kopplung des Garraumes geschieht bekannterweise mittels Durchbrüchen zwischen Resonatorraum und Garraum. Ein Feldverteiler (Propeller oder Drehantenne), der zu­sätzlich eingebaut ist, sorgt dafür, dass das ganze Mikrowellenfeld in Bewegung ist, d.h. dass die zwangs­ mässig durch die physikalische Ausbreitung der Mikrowelle im Garraum entstehenden heissen und kalten Punkte gegeneinander verschoben werden und somit an jeder Stelle gleich starke Erwärmung stattfindet.The invention relates to a device for coupling a microwave field to a microwave oven, the microwave field generated by at least one microwave transmitter reaching the cooking chamber of the oven via at least one waveguide, a metallically closed resonator chamber being provided between the cooking chamber and the waveguide, to which the Waveguide is connected and is connected to the cooking space via coupling openings. Such a device is known from publication DE-A-3028009. With such devices, the transition from the waveguide into the cooking chamber is particularly important. This transition largely determines the optimal field distribution in the cooking space. The aim here is to ensure that exactly the same heating takes place at every point in the cooking space. As is known, this coupling of the cooking space takes place by means of openings between the resonator space and the cooking space. A field distributor (propeller or rotating antenna), which is also installed, ensures that the entire microwave field is in motion, ie that the forced the hot and cold spots that occur in the cooking space due to the physical spread of the microwave are shifted against each other and the temperature is increased to the same extent at every point.

Bekannt sind auch Einrichtungen, bei welchen der Hohlleiter frontal direkt an den Garraum angeschlos­sen ist. Somit geschieht die Einkopplung direkt vom Hohlleiter in den Garraum. Die ganze Feldverteilung im Garraum kann dann nur durch den Feldverteiler optimiert werden.Devices are also known in which the waveguide is connected frontally directly to the cooking space. Thus the coupling takes place directly from the waveguide into the cooking space. The entire field distribution in the cooking space can then only be optimized by the field distributor.

Es sind ferner Lösungen bekannt, bei denen eine Kiste auf den Garraum aufgebaut ist, die durch eine Keramikabdeckung, eventuell durch eine Glas- oder Pla­stikabdeckung, vom Garraum getrennt ist. Der Hohlleiter ist jeweils frontal an die Kiste angeblockt und der Feldverteiler ist üblicherweise in dieser Kiste ange­bracht, welche im Hinblick auf das Mikrowellenfeld ein Teil des Garraums darstellt.Solutions are also known in which a box is built onto the cooking space, which is separated from the cooking space by a ceramic cover, possibly by a glass or plastic cover. The waveguide is in each case blocked from the front of the box and the field distributor is usually mounted in this box, which is part of the cooking space with regard to the microwave field.

Bei all diesen Lösungen besteht neben dem Problem der schlechten Entkopplung des Senders vom Garraum das Problem, dass der resultierende Spannungs­vektor des Mikrowellenfeldes ausgehend von der Vektor­richtung im Hohlleiter gewisse Vorzugsrichtungen besitzt. Die erwähnten Feldverteler bewirken zwar in beschränktem Mass, dass sich dieser Spannungsvektor auch in die andern beiden Dimensionen ausbreitet. Dies ist jedoch oft ungenügend, indem weiterhin der Spannungsvektor in der eingekoppelten Richtung überwiegt, womit die Erwärmung nicht optimal erfolgt.In all of these solutions, in addition to the problem of poor decoupling of the transmitter from the cooking space, there is the problem that the resulting voltage vector of the microwave field has certain preferred directions starting from the vector direction in the waveguide. The field switches mentioned have a limited effect in that this voltage vector also spreads in the other two dimensions. However, this is often insufficient in that the voltage vector continues to predominate in the coupled direction, so that the heating does not take place optimally.

Es stellt sich damit die Aufgabe, die eingangs erwähnte Einkopplungsvorrichtung so auszugestalten, dass einerseits die Entkopplung von Sender und Garraum. ver­bessert wird und gleichzeitig im Garraum keine bevor­zugten Feldrichtungen auftreten.It is therefore the task of designing the coupling device mentioned at the outset in such a way that on the one hand, the decoupling of the transmitter and the cooking space. is improved and at the same time no preferred field directions occur in the cooking space.

Diese Aufgabe wird dadurch gelöst, dass im Resonatorraum stationäre Kopplungsgelmente angeordnet sind, um den Spannungsvektor aus der Einkoppelrichtung (Ez) auch in die zwei übrigen Dimensionen (Ex, Ey) zu koppeln.
Damit kann bereits im Resonatorraum selbst die ge­wünschte, isotrope Feldverteilung erzielt werden.This object is achieved in that stationary coupling elements are arranged in the resonator space in order to also couple the voltage vector from the coupling direction (E z ) into the other two dimensions (E x , E y ).
The desired isotropic field distribution can thus be achieved even in the resonator space itself.

Vorzugsweise ist der Resonatoraum durch eine metallische Trennwand vom Garraum getrennt, welche Einkopplungsöffnungen aufweist, deren Abmessungen kleiner sind, als diejenigen der Trennwand und die derart geformt sind, dass die resultierenden Spannungsvektoren des Mikrowellenfeldes gleichmässig in den Garraum eingekoppelt werden.The resonator space is preferably separated from the cooking space by a metallic partition wall which has coupling openings whose dimensions are smaller than those of the partition wall and which are shaped such that the resulting voltage vectors of the microwave field are evenly coupled into the cooking space.

Um das Mikrowellenfeld im Garraum zu bewegen, ist zusätzlich mit Vorteil ein beweglicher Feldverteiler im geschlossenen Resonatorraum angeordnet.In order to move the microwave field in the cooking space, a movable field distributor is also advantageously arranged in the closed resonator space.

Der vorgesehene Resonatorraum entkoppelt den Garraum vom Mikrowellensender, welcher damit von der jeweiligen Last im Garraum unbeeinflusst bleibt und damit bei optimalem Wirkungsgrad betrieben werden kann, wobei im Garraum eine gleichmässige Ausrichtung der resultie­renden Spannungsvektoren des Mikrowellenfelds und damit eine gleichmässige Erwärmung erzielt wird.The intended resonator chamber decouples the cooking chamber from the microwave transmitter, which thus remains unaffected by the respective load in the cooking chamber and can thus be operated with optimum efficiency, with a uniform alignment of the resulting voltage vectors of the microwave field and thus uniform heating being achieved in the cooking chamber.

Nachfolgend wird anhand der beiliegenden Ausführungsbeispiele die Erfindung näher beschrieben. Es zeigen:

  • Fig. 1 eine perspektivische Gesamtansicht einer ersten Ausführung der Vorrichtung, wobei die Kopp­lungselemente darin nicht eingezeichnet sind,
  • Fig. 2 eine schematische Darstellung der Ausrichtung des Spannungsvektors im Hohlleiter;
  • Fig. 3 eine Detailansicht des Resonatorraums mit den Kopplungselementen, und
  • Fig. 4 eine perspektivische Ansicht einer Ausführung mit zwei Sendern, wobei die Kopplungselemente ebenfalls nicht eingezeichnet sind.
The invention is described in more detail below on the basis of the enclosed exemplary embodiments. Show it:
  • Fig. 1 is an overall perspective view of a first Implementation of the device, the coupling elements not being shown therein,
  • Figure 2 is a schematic representation of the orientation of the voltage vector in the waveguide.
  • Fig. 3 is a detailed view of the resonator room with the coupling elements, and
  • Fig. 4 is a perspective view of an embodiment with two transmitters, wherein the coupling elements are also not shown.

In Fig. 1 ist ein Mikrowellensender 1 mit einem Magnetron 4 ersichtlich, das in einen Rechteck-Hohlleiter 2 hineinragt. Das Magnetron 4 erzeugt in bekannter Weise ein Mikrowellenfeld, das über den Hohlleiter 2 einem Garraum 3 zugeführt wird, der zur Aufnahme des Kochguts ausgestaltet ist. Der Rechteckhohlleiter 2 ist so dimen­sioniert, dass der resultierende Spannungsvektor Ez des Mikrowellenfelds im Hohlleiter senkrecht zu dessen Breitseite steht, wie in Fig. 2 angedeutet.1 shows a microwave transmitter 1 with a magnetron 4 which projects into a rectangular waveguide 2. In a known manner, the magnetron 4 generates a microwave field, which is fed via the waveguide 2 to a cooking space 3, which is designed to receive the food. The rectangular waveguide 2 is dimensioned such that the resulting voltage vector E z of the microwave field in the waveguide is perpendicular to its broad side, as indicated in FIG. 2.

Wird z.B. ein dünner, langer, elektrisch schlecht leitender Stab parallel zum obigen Spannungs­vektor in den Hohlleiter gehalten, nimmt er Energie auf, d.h. er erwärmt sich. Wird er senkrecht zum Spannungs­vektor in den Hohlleiter gehalten, so nimmt er keine Energie auf, weil die Ausdehnung des Stabes in die Richtung des Spannungsvektors zu klein ist.E.g. a thin, long, electrically poorly conductive rod held parallel to the above voltage vector in the waveguide, it absorbs energy, i.e. he warms up. If it is held perpendicular to the voltage vector in the waveguide, it does not absorb any energy because the extension of the rod in the direction of the voltage vector is too small.

Sind in einem Hohlraum Spannungsvektoren in alle drei Richtungen (Dimensionen) vorhanden, so wird der Stab immer aufgeheizt, unabhängig in welcher Richtung er im Hohlraum steht. Dieses illustriert, auf das Kochgut übertragen, die Bedeutung der Spannungsvektoren-Ausrich­ tung im Garraum 3. Der Garraum 3 bildet einen Hohlraum, in welchem bei herkömmlichen Anordnungen ein Spannungs­vektor in der Richtung, in welcher er eingekoppelt wird, vorherrscht.If there are tension vectors in all three directions (dimensions) in a cavity, the rod is always heated, regardless of the direction in which it is in the cavity. Applied to the food to be cooked, this illustrates the importance of voltage vector alignment device in the cooking chamber 3. The cooking chamber 3 forms a cavity in which, in conventional arrangements, a voltage vector prevails in the direction in which it is coupled.

Der Hohlleiter 2 ist gemäss Fig. 1 an einen Resonatorraum 5 angeschlossen, der kastenförmig ausge­staltet ist. Dieser ist metallisch abgeschlossen und durch Koppelöffnungen 6 mit dem Garraum 3 verbunden. Die Koppelöffnungen sind in einer Trennwand 8 angeordnet, die dem Resonatorraum 5 und dem Garraum 3 gemeinsam ist. Die Koppelöffnungen 6, welche in ihren Abmessungen kleiner sind als die Trennwand 8 dienen dazu, die Ausrichtung des Mikrowellenfeldes in mehrere Richtungen zu bewirken. Dies kann auf verschiedene Arten erfolgen. Gemäss Fig. 1 wird durch die schlitzförmige Ausgestaltung der Koppel­öffnungen 6 bewirkt, dass Spannungsvektoren Ex und Ey eingekoppelt werden, welche je senkrecht zur Schlitz­ausdehnung verlaufen.According to FIG. 1, the waveguide 2 is connected to a resonator chamber 5 which is box-shaped. This is metallically sealed and connected to the cooking space 3 by coupling openings 6. The coupling openings are arranged in a partition 8, which is common to the resonator chamber 5 and the cooking chamber 3. The coupling openings 6, which are smaller in their dimensions than the partition 8, serve to effect the alignment of the microwave field in several directions. This can be done in several ways. According to FIG. 1, the slot-shaped design of the coupling openings 6 causes voltage vectors E x and E y to be coupled in, which are each perpendicular to the slot extension.

Die Koppelöffnungen 6 können aber auch andere Formen (rund, quadratisch) aufweisen und z.B. quer im Raum 5 angeordnet sein, um das Feld so zu beeinflussen, dass im Garraum 3 eine möglichst gleichmässige Verteilung der Mikrowellenenergie in allen drei Dimensionen erreicht wird.The coupling openings 6 can also have other shapes (round, square) and e.g. be arranged transversely in space 5 in order to influence the field in such a way that the most uniform possible distribution of microwave energy in all three dimensions is achieved in cooking space 3.

Erfindungsgemäss sind nun in diesem Resonator­raum 5 besondere Koppelelemente 9 in Form von Koppel­stiften angeordnet, wie dies in Fig. 3 dargestellt ist. Mit diesen Koppelstiften kann erreicht werden, dass der Spannungsvektor Ez bereits im Resonatorraum 5 aus der Einkoppelrichtung auch in die übrigen zwei Richtungen Ex und Ey gekoppelt wird. Solche Koppelelemente, welche als hohle oder volle Metallstifte ausgebildet sind, können mit unterschiedlichen Koppelöffnungen 6 kombiniert werden wie vorstehend erwähnt. In Fig. 3 ist eine kreisförmige Koppelöffnung 11 gezeigt.According to the invention, special coupling elements 9 in the form of coupling pins are now arranged in this resonator space 5, as is shown in FIG. 3. With these coupling pins it can be achieved that the voltage vector E z already in the resonator space 5 from the coupling direction also in the remaining two directions E x and E y is coupled. Such coupling elements, which are designed as hollow or solid metal pins, can be combined with different coupling openings 6, as mentioned above. A circular coupling opening 11 is shown in FIG. 3.

Wie sich aus Fig. 3 ergibt sind die Koppel­stifte 9 an den Kanten der oberen Deckfläche des Resona­torraums 5 befestigt und ragen in der gezeigten Weise in den Resonatorraum. Die Koppelstifte 9 sind dabei so angeordnet, dass sie etwa in einem Winkel = 45° zur Einkopplungsrichtung z verlaufen. Jeder Koppelstift 9 definiert mit dieser Einkopplungsrichtung z eine Ebene, welche eine x-(bzw. y-) Achse festlegt, in welcher eine Spannungsvektorkomponente Ex (bzw.Ey) erzeugt wird.As can be seen from FIG. 3, the coupling pins 9 are fastened to the edges of the upper cover surface of the resonator chamber 5 and project into the resonator chamber in the manner shown. The coupling pins 9 are arranged such that they run approximately at an angle = 45 ° to the coupling direction z. With this coupling direction z, each coupling pin 9 defines a plane which defines an x (or y) axis in which a voltage vector component E x (or E y ) is generated.

Damit wird bereits im Resonatorraum die ange­strebte Gleichverteilung der Mikrowellenenergie in den drei Dimensonen erzeugt, welche durch die Koppelöff­nungen 6 in den Garraum übertragen wird.The desired uniform distribution of the microwave energy in the three dimension zones, which is transmitted through the coupling openings 6 into the cooking chamber, is thus generated in the resonator chamber.

Während die bisher beschriebenen Massnahmen also die statische Gleichverteilung der Mikrowellenener­gie in den drei Dimensionen anstreben, ist ferner auch erwünscht, das Mikrowellenfeld im Garraum 3 zu bewegen, um die im Garraum entstehenden heissen und kalten Punkte gegeneinanander zu verschieben und an jeder Stelle eine gleichmässige Erwärmung des Kochguts zu ermöglichen. Hierfür ist gemäss Fig. 1 ein beweglicher Feldverteiler 7 (Propeller oder Drehantenne) im Resonatorraum 5 angeord­net. Das in der beschriebenen Weise ausgestaltete, mehrdimensional verteilte Mikrowellenfeld wird auf diese Weise zusätzlich bewegt. Der Feldverteiler 7 kann dazu auch im Garraum 3 selbst angeordnet sein.So while the measures described so far aim for the static uniform distribution of the microwave energy in the three dimensions, it is also desirable to move the microwave field in the cooking space 3 in order to shift the hot and cold points arising in the cooking space against one another and to uniformly heat the cooking space at every point To enable cookware. 1, a movable field distributor 7 (propeller or rotary antenna) is arranged in the resonator chamber 5. The multi-dimensionally distributed microwave field configured in the manner described is additionally moved in this way. For this purpose, the field distributor 7 can also be arranged in the cooking space 3 itself.

Schliesslich ist in Fig. 4 eine entsprechend ausgebildete Einkoppelungsvorrichtung gezeigt, bei welcher zwei Sender 1,1ʹ mittels je einem Hohlleiter 2,2ʹ an einen gemeinsamen Resonatorraum 5 angeschlossen sind, der seinerseits über Koppelöffnungen 11,11ʹ an den Garraum 3 gekoppelt ist. Die übrigen Teile, wie Koppel­elemente und Feldverteiler, sind zur Vereinfachung in der Zeichnung nicht dargestellt.Finally, FIG. 4 shows a correspondingly designed coupling device, in which two transmitters 1, 1 'are connected to a common resonator chamber 5 by means of a waveguide 2, 2', which in turn is coupled to cooking chamber 3 via coupling openings 11, 11 '. The remaining parts, such as coupling elements and field distributors, are not shown in the drawing for the sake of simplicity.

Der beschriebene Einkopplungsresonator kann wahlweise an der Deck- oder Grundfläche des Garraums oder an einer seiner Seitenflächen angesetzt sein. Der Hohl­leiter 2 mündet dabei jeweils an einer Seite 10 des kastenförmigen Resonatorraums 5, welche an die Trennwand 8 zum Garraum anstösst.The coupling resonator described can optionally be attached to the top or base surface of the cooking space or to one of its side surfaces. The waveguide 2 opens in each case on one side 10 of the box-shaped resonator chamber 5, which abuts the partition 8 to the cooking chamber.

Mit der beschriebenen Vorrichtung wird ein Einkoppelsystem beschrieben, mit dem nebst der besseren Entkopplung von Sender und Garraum auch verschiedene Möglichkeiten gegeben sind, das Mikrowellenfeld vor und während der Einkopplung in den Garraum in allen drei Dimensionen auszurichten. Der Feldverteiler bewegt zusätzlich das Mikrowellenfeld in allen drei Dimensionen. Daraus erfolgt eine optimale Wärmeverteilung im Garraum.With the device described, a coupling system is described with which, in addition to the better decoupling of the transmitter and the cooking space, there are also various possibilities for aligning the microwave field in all three dimensions before and during the coupling into the cooking space. The field distributor also moves the microwave field in all three dimensions. This results in optimal heat distribution in the cooking space.

Claims (9)

1. Vorrichtung zur Einkoppelung eines Mikro­wellenfeldes an einem Mikrowellenherd, wobei das von mindestens einem Mikrowellensender (1) erzeugte Mikro­wellenfeld über mindestens einen Hohlleiter (2) zum Garraum (3) des Herds gelangt, wobei zwischen dem Garraum (3) und dem Hohlleiter (2) ein metallisch geschlossener Resonatorraum (5) vorgesehen ist, an den der Hohlleiter angeschlossen ist und der über Koppelöffnungen (6) mit dem Garraum (3) verbunden ist, dadurch gekennzeichnet, dass im Resonatorraum (5) stationäre Kopplungselemente (9) angeordnet sind, um den Spannungsvektor aus der Einkoppelrichtung (Ez) auch in die zwei übrigen Dimensi­onen (Ex, Ey ) zu koppeln.1. Device for coupling a microwave field to a microwave oven, the microwave field generated by at least one microwave transmitter (1) reaching the cooking chamber (3) of the oven via at least one waveguide (2), with the cooking chamber (3) and the waveguide (2 ) a metallically closed resonator chamber (5) is provided, to which the waveguide is connected and which is connected to the cooking chamber (3) via coupling openings (6), characterized in that stationary coupling elements (9) are arranged in the resonator chamber (5), to also couple the voltage vector from the coupling direction (E z ) into the other two dimensions (E x , E y ). 2. Vorrichtung nach Anspruch 1, dadurch ge­kennzeichnet, dass als Kopplungselemente (9) zwei Kop­pelstifte (9) vorgesehen sind, die etwa unter einem Winkel von 45° zur Einkopplungsrichtung verlaufen und mit dieser je eine Ebene definieren, welche etwa senkrecht zueinander stehen.2. Device according to claim 1, characterized in that two coupling pins (9) are provided as coupling elements (9), which extend approximately at an angle of 45 ° to the coupling direction and each define a plane which is approximately perpendicular to one another. 3. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Resonatorraum durch eine metallische Trennwand (8) vom Garraum (3) getrennt ist, welche mindestens eine Einkoppelungsöffnung (6) aufweist, deren Abmessungen kleiner sind als dieje­nigen der Trennwand.3. Device according to one of the preceding claims, characterized in that the resonator chamber is separated from the cooking chamber (3) by a metallic partition (8) which has at least one coupling opening (6), the dimensions of which are smaller than those of the partition. 4. Vorrichtung nach Anspruch 3, dadurch ge­kennzeichnet, dass die Einkoppelungsöffnungen (6) derart geformt sind, dass die resultierenden Spannungsvektoren des Mikrowellenfeldes im Garraum gleichmässig in den Garraum eingekoppelt werden.4. The device according to claim 3, characterized in that the coupling openings (6) are shaped such that the resulting voltage vectors of the microwave field in the cooking space are evenly coupled into the cooking space. 5. Vorrichtung nach einem der vorangehenden Ansprüche 2 bis 4, dadurch gekennzeichnet, dass der Resonatorraum (5) im wesentlichen kastenförmig ausge­staltet ist, wobei der Hohlleiter an einer Wand (10) mündet, die an die Trennwand (8) anstösst und wobei die Koppelstifte (9) im Bereich der der Trennwand gegenüber­liegenden Deckwand befestigt sind.5. Device according to one of the preceding claims 2 to 4, characterized in that the resonator chamber (5) is substantially box-shaped, the waveguide opening onto a wall (10) which abuts the partition (8) and wherein the coupling pins (9) are fastened in the region of the top wall opposite the partition. 6. Vorrichtung nach Anspruch 5, dadurch ge­kennzeichnet, dass die Koppelstifte etwa in der Mitte zweier aneinanderstossender Seiten der Deckwand befestigt sind.6. The device according to claim 5, characterized in that the coupling pins are attached approximately in the middle of two abutting sides of the top wall. 7. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass im abgeschlos­senen Resonatorraum (5) ein beweglicher Feldverteiler (7) angeordnet ist.7. Device according to one of the preceding claims, characterized in that a movable field distributor (7) is arranged in the closed resonator chamber (5). 8. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass im Garraum ein Feldverteiler vorgesehen ist.8. Device according to one of the preceding claims, characterized in that a field distributor is provided in the cooking space. 9. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass mehrere Mikro­wellensender (1,1ʹ) vorgesehen sind, die über Hohlleiter (2,2ʹ) an den Resonatorraum (5) angeschlossen sind.9. Device according to one of the preceding claims, characterized in that a plurality of microwave transmitters (1,1ʹ) are provided, which are connected via waveguides (2,2ʹ) to the resonator chamber (5).
EP19880104551 1987-03-24 1988-03-22 Device for coupling a micro-wave field to a micro-wave oven Expired - Lifetime EP0284958B1 (en)

Applications Claiming Priority (2)

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CH1137/87 1987-03-24
CH113787A CH674563A5 (en) 1987-03-24 1987-03-24

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EP0284958B1 EP0284958B1 (en) 1992-06-03

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2751055A1 (en) * 1996-07-15 1998-01-16 Moulinex Sa ELECTRIC COOKING OVEN
EP0949847A2 (en) * 1998-04-06 1999-10-13 Lg Electronics Inc. Waveguide for microwave oven
EP3448121A1 (en) 2017-08-23 2019-02-27 Vorwerk & Co. Interholding GmbH Microwave feed-in device on a microwave oven

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1081987B (en) * 1959-05-16 1960-05-19 Philips Patentverwaltung Arrangement for feeding microwave energy into the working space of a dielectric heating device
FR2241179A1 (en) * 1973-08-17 1975-03-14 Philips Nv
DE3022235A1 (en) * 1980-06-13 1981-12-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Microwave oven with antenna - which forms extension to feed guide and its sited for max. usable volume of cooking chamber
DE3028009A1 (en) * 1980-07-24 1982-02-18 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Microwave oven with even heat cooking distribution - has radiator in front of apertured microwave distribution plate incorporated in oven wall

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1081987B (en) * 1959-05-16 1960-05-19 Philips Patentverwaltung Arrangement for feeding microwave energy into the working space of a dielectric heating device
FR2241179A1 (en) * 1973-08-17 1975-03-14 Philips Nv
DE3022235A1 (en) * 1980-06-13 1981-12-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Microwave oven with antenna - which forms extension to feed guide and its sited for max. usable volume of cooking chamber
DE3028009A1 (en) * 1980-07-24 1982-02-18 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Microwave oven with even heat cooking distribution - has radiator in front of apertured microwave distribution plate incorporated in oven wall

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2751055A1 (en) * 1996-07-15 1998-01-16 Moulinex Sa ELECTRIC COOKING OVEN
WO1998003041A1 (en) * 1996-07-15 1998-01-22 Moulinex S.A. Electric cooking oven
US6057535A (en) * 1996-07-15 2000-05-02 Moulinex S.A. Electric cooking oven with improved energy distribution
EP0949847A2 (en) * 1998-04-06 1999-10-13 Lg Electronics Inc. Waveguide for microwave oven
EP0949847A3 (en) * 1998-04-06 2000-04-26 Lg Electronics Inc. Waveguide for microwave oven
EP3448121A1 (en) 2017-08-23 2019-02-27 Vorwerk & Co. Interholding GmbH Microwave feed-in device on a microwave oven

Also Published As

Publication number Publication date
CH674563A5 (en) 1990-06-15
DE3871587D1 (en) 1992-07-09
EP0284958B1 (en) 1992-06-03

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