EP0420319A1 - Electric oven - Google Patents

Electric oven Download PDF

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Publication number
EP0420319A1
EP0420319A1 EP90202450A EP90202450A EP0420319A1 EP 0420319 A1 EP0420319 A1 EP 0420319A1 EP 90202450 A EP90202450 A EP 90202450A EP 90202450 A EP90202450 A EP 90202450A EP 0420319 A1 EP0420319 A1 EP 0420319A1
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EP
European Patent Office
Prior art keywords
housing
reflector
hood
electric cooker
cooker according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90202450A
Other languages
German (de)
French (fr)
Other versions
EP0420319B1 (en
Inventor
Walter Braun
Günter Bopp
Dieter Grimm
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.)
Bauknecht Hausgeraete GmbH
Whirlpool Europe BV
Original Assignee
Bauknecht Hausgeraete GmbH
Whirlpool Europe BV
Whirlpool International BV
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Publication date
Application filed by Bauknecht Hausgeraete GmbH, Whirlpool Europe BV, Whirlpool International BV filed Critical Bauknecht Hausgeraete GmbH
Publication of EP0420319A1 publication Critical patent/EP0420319A1/en
Application granted granted Critical
Publication of EP0420319B1 publication Critical patent/EP0420319B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • H05B6/766—Microwave radiation screens for windows
    • 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
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6482—Aspects related to microwave heating combined with other heating techniques combined with radiant heating, e.g. infrared heating

Definitions

  • the invention relates to an electric cooker with a cooking space for cooking food by supplying heat and / or microwave energy, the heat energy source, for. B. is fixed in an upper region of the cooking space, which has a reflector and is separated from the cooking space by a metallic grid which is electrically conductively connected to the reflector.
  • An electrical appliance of the type mentioned is a so-called combination cooker.
  • Radiant heaters e.g. B. halogen lamps, the z. B. are arranged in the upper region of the cooking space and are generally separated from the cooking space by a glass plate.
  • the glass plate has a high permeability to heat radiation.
  • the microwave energy propagating in the cooking space is fed into another part of the oven.
  • the reflector arranged above each heat energy source ensures an even distribution of the heat radiation. If a halogen lamp is used as the heat energy source and is introduced into a microwave field without protective measures, gas discharge processes occur between the incandescent filament and its fastening webs. This leads to a reduction in the Efficiency, undesirable optical phenomena (bluish glow) and a reduction in the life of the lamps.
  • a metallic grating that is conductively connected to the reflector.
  • a grid e.g. B. expanded metal grid
  • the grating also causes the electric field lines to align perpendicular to the grating, so that the microwave absorption of the glass plate is reduced.
  • An electric cooker of the type mentioned is such. B. made known by US-PS 40 96 369.
  • the heat energy source is located in the upper part of the cooking space, which is separated from the lower part of the cooking space by a grating angled on two sides, in which the microwave energy spreads.
  • a reflector arranged above the heat energy source is intended to prevent microwave leakage radiation guided by the leads of the heat energy source from escaping.
  • the supply lines of the heat energy source are led to the outside via bushings of the housing.
  • the invention has for its object to design a combination cooker of the type mentioned in such a way that there is a compact structure with a clear separation between the cooking chamber and the space for receiving the heat energy source (boiler room) and that of the cooking chamber in the boiler room mentioned escaping microwave radiation is reduced to a minimum or made harmless.
  • This object is achieved according to the invention in that the upper region of the cooking space is designed as a hood formed from the housing, that the reflector drawn into the hood, leaving a cavity to the hood, in the attachment region of the hood over a flat edge region with the plan Grid is connected and that the reflector with its grating is insulated from the housing to form a capacitive microwave seal between the housing and the flat edge region.
  • the reflector is attached to the flat grid by flanging its edge region. Furthermore, the top of the housing in the attachment area of the hood is provided with a circumferential elevation to accommodate the flat reflector edge area with the grating.
  • a simple assembly of the reflector and a secure mounting preferably results from the fact that the reflector with grating is pressed with its flat edge regions against the step-like elevation of the housing by means of a ceramic bolt which engages on the inside of the reflector and is resiliently supported on the outside of the hood.
  • This ceramic holder is resistant to high temperatures and high electrical field strengths.
  • a more or less large, penetrating through the grating in the boiler room residual radiation has the consequence that the microwaves along the heating energy source, for. B. a heating coil.
  • the spread along a coiled part of the heat energy source can be prevented in that this heating coil in the embodiment of the invention has a high impedance for the residual radiation penetrating through the grating.
  • the non-coiled leads of the heating wire act as an antenna and enable the formation of a coaxial TEM wave. This leads to lighting phenomena and to a relatively high microwave leakage radiation through the bushings for the heat energy source arranged in the walls of the hood.
  • these disadvantages can be avoided in that the housing on the outside in the area of a passage of the heat energy source with a Housing electrically insulated, angled shielding plate is provided, one leg of which runs perpendicularly to the supply line of the heat energy source and is electrically conductively connected to the supply line, and whose other leg running parallel to the supply line is fastened to the top of the hood.
  • the leg of the shielding plate arranged at right angles to the feed line causes a short circuit in the coaxial TEM wave and leads to a mismatch or reflection of the microwave energy.
  • the other, horizontally extending leg of the shielding plate is used for additional microwave shielding.
  • the vertical leg of the shielding plate is insulated from the front side by a U-shaped insulating piece and the horizontal leg is insulated from the enamelled housing by an insulating film.
  • the housing and shielding plate form a capacitor of low capacitance. This blocks the mains voltage applied to the housing and short-circuits high-frequency electrical potentials. This prevents static charges that could lead to lighting effects in the area of the lamp leadthrough.
  • the relatively high leakage radiation in the area of the bushings mentioned above is based on the fact that the bushing and the feed line form a coaxial conductor for the microwave, in which a wave propagates.
  • the part of the shielding plate which is arranged near this feed-through and runs at right angles to the feed line and is electrically conductively connected to the feed line forms a low-impedance termination for the coaxial line, that is to say a short circuit for the shaft.
  • leg of the shielding plate which is at right angles to the feed line has a dimension which is at least equal to a quarter of the wavelength of the microwave in free space.
  • the electric cooker according to the invention has a housing 10 made of sheet iron, which is enamelled on both sides and has a hood 11 formed on the upper side from the upper housing wall for receiving and storing a halogen lamp 12 in a heating chamber 13.
  • the halogen lamp 12 has a coiled heating conductor 14 and uncoiled supply lines 15 and is mounted in bushings 11a of the hood 11.
  • the heating chamber 13 with the halogen lamp 12 is separated from the cooking chamber 17 of the electric oven by a glass plate 16.
  • an expanded metal grill 18, which is flanged with a reflector 19 by a flanged edge areas 20 is electrically connected.
  • the flat edge regions 20 of the reflector lie in a circumferential step-shaped elevation 21 of the top of the housing 10.
  • the unit consisting of the reflector 19 and the grating 18 is fastened via a ceramic sleeve 22, which on the one hand has a collar 22a on the inside of the reflector 19 abuts and on the other hand is supported by a spring 23 on the outside of the hood 11.
  • the flat edge regions 20 are pulled against the elevation 21 by spring pressure.
  • the flat edge regions 20, together with the enamelled wall regions of the elevation 21, form a capacitive microwave seal which, together with the high impedance of the cavity 13a between the rear of the reflector 19 and the wall of the hood 11, prevent high wall currents.
  • the non-coiled supply lines 15 of the halogen lamp 12 act as an antenna for the residual radiation penetrating through the grating 18 and enable the formation of a coaxial TEM wave along the supply line 15. This can result in static charges in the lamp which increase in the area of the lamp leadthrough 11a Lead lighting effects.
  • This is avoided by an angled shielding plate 24 with a leg 24a perpendicular to the feed line 15 and a leg 24b running parallel to the feed line.
  • the leg 24a is electrically conductively connected to the feed line 15.
  • the leg 24a is insulated from the housing 10 or the hood 11 by a U-shaped insulating piece 25 and the leg 24b by an insulating disk 26.
  • the hood 11 and the leg 24b form a capacitor of low capacitance, which blocks the mains voltage applied to the housing, and high-frequency electrical potentials shorts. This prevents the build-up of the above-mentioned charges and thus the appearance of lighting effects.
  • the leg 24a running at right angles to the feed line 15 thus reflects the microwave emerging in the form of a coaxial wave into the hood 11, while the leg 24b running horizontally to the feed line enables a further reduction in the leakage radiation due to its shielding effect.
  • the angular shielding plate 24 is shown, the leg width of which is designated by 27.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)

Abstract

A compact, space-saving and microwave-proof construction is achieved for an electric oven having combined heating by microwave energy and/or thermal energy in that the thermal energy source is arranged in a microwave-proof cap which is formed on the top of the cooking space, a reflector allocated to the heating energy source in the transition region between the heating space and the cooking space being electrically conductively connected to a metal grid and insulated on the housing. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Elektroherd mit einem Garraum zum Garen von Speisen durch Zufuhr von Wärme- und/oder Mikrowellenenergie, wobei die Wärmeenergiequelle z. B. in einem oberen Bereich des Garraumes befestigt ist, der einen Reflektor aufweist und durch ein metallisches, mit dem Reflektor elektrisch leitend verbundenes Gitter vom Garraum abgetrennt ist.The invention relates to an electric cooker with a cooking space for cooking food by supplying heat and / or microwave energy, the heat energy source, for. B. is fixed in an upper region of the cooking space, which has a reflector and is separated from the cooking space by a metallic grid which is electrically conductively connected to the reflector.

Bei einem Elektrogerät der eingangs genannten Art handelt es sich um einen sogenannten Kombinationsherd. Als Wärme­energiequellen dienen vorzugsweise Strahlungsheizkörper, z. B. Halogenlampen, die z. B. im oberen Bereich des Gar­raumes angeordnet sind und im allgemeinen durch eine Glas­platte vom Garraum getrennt sind. Die Glasplatte besitzt eine hohe Durchlässigkeit für Wärmestrahlung. Die Einspeisung der sich im Garraum ausbreitenden Mikrowellen­energie erfolgt in einem anderen Teil des Herdes. Der oberhalb einer jeden Wärmeenergiequelle angeordnete Reflektor sorgt für eine gleichmäßige Verteilung der Wärmestrahlung. Wenn als Wärmeenergiequelle eine Halogen­lampe verwendet wird, die ohne Schutzmaßnahmen in ein Mikrowellenfeld eingebracht wird, so kommt es zu Gas­entladungsvorgängen zwischen der Glühwendel und deren Befestigungsstegen. Dies führt zu einer Verminderung des Wirkungsgrades, zu unerwünschten optischen Erscheinungen (bläuliches Glimmen) und zu einer Minderung der Lebens­dauer der Lampen. Diese Erscheinungen können insbesondere weitgehend durch ein leitend mit dem Reflektor verbundenes metallisches Gitter verhindert werden. Ein derartiges Gitter, z. B. Streckmetallgitter, beeinträchtigt die Verteilung der Wärmestrahlung nicht und bewirkt eine beträchtliche Reflexion der aus dem Garraum kommenden Mikrowellenenergie. Ein solches Metallgitter besitzt eine hohe elektrische Leitfähigkeit, um die auftretenden Ströme verlustarm transportieren zu können. Das Gitter bewirkt ferner, daß sich die elektrischen Feldlinien senkrecht zum Gitter ausrichten, so daß die Mikrowellenabsoption der Glasplatte reduziert wird. Durch ein derartiges Gitter wird zwar der größte Teil der Mikrowellenstrahlung reflektiert, eine Reststrahlung gelangt jedoch immer noch in den die Wärmequelle aufnehmenden Raum (Heizraum) und bewirkt dort die genannten Nachteile in abgeschwächter Form.An electrical appliance of the type mentioned is a so-called combination cooker. Radiant heaters, e.g. B. halogen lamps, the z. B. are arranged in the upper region of the cooking space and are generally separated from the cooking space by a glass plate. The glass plate has a high permeability to heat radiation. The microwave energy propagating in the cooking space is fed into another part of the oven. The reflector arranged above each heat energy source ensures an even distribution of the heat radiation. If a halogen lamp is used as the heat energy source and is introduced into a microwave field without protective measures, gas discharge processes occur between the incandescent filament and its fastening webs. This leads to a reduction in the Efficiency, undesirable optical phenomena (bluish glow) and a reduction in the life of the lamps. In particular, these phenomena can be largely prevented by a metallic grating that is conductively connected to the reflector. Such a grid, e.g. B. expanded metal grid, does not affect the distribution of heat radiation and causes a considerable reflection of the microwave energy coming from the cooking space. Such a metal grid has a high electrical conductivity in order to be able to transport the occurring currents with little loss. The grating also causes the electric field lines to align perpendicular to the grating, so that the microwave absorption of the glass plate is reduced. Although the majority of the microwave radiation is reflected by such a grating, residual radiation still reaches the space receiving the heat source (boiler room) and there, in a weakened form, causes the disadvantages mentioned.

Ein Elektroherd der eingangs genannten Art ist z. B. durch die US-PS 40 96 369 bekannt geworden. Bei der bekannten Bauart befindet sich die Wärmeenergiequelle im oberen Teil des Garraumes, der durch ein an zwei Seiten abgewinkeltes Gitter vom unteren Teil des Garraumes getrennt ist, in dem sich die Mikrowellenenergie ausbreitet. Ein oberhalb der Wärmeenergiequelle angeordneter Reflektor soll verhindern, daß von den Zuleitungen der Wärmeenergiequelle geführte Mikrowellen-Leckstrahlung austritt. Die Zuleitungen der Wärmeenergiequelle werden über Durchführungen des Gehäuses nach außen geleitet.An electric cooker of the type mentioned is such. B. made known by US-PS 40 96 369. In the known design, the heat energy source is located in the upper part of the cooking space, which is separated from the lower part of the cooking space by a grating angled on two sides, in which the microwave energy spreads. A reflector arranged above the heat energy source is intended to prevent microwave leakage radiation guided by the leads of the heat energy source from escaping. The supply lines of the heat energy source are led to the outside via bushings of the housing.

Der Erfindung liegt die Aufgabe zugrunde, einen Kombinationsherd der eingangs genannten Art derart zu gestalten, daß sich ein kompakter Aufbau mit einer klaren Trennung zwischen dem Garraum und dem Raum zur Aufnahme der Wärmeenergiequelle (Heizraum) ergibt und daß die von dem Garraum in den genannten Heizraum austretende Mikrowellenstrahlung auf ein Minimum herabgesetzt wird bzw. unschädlich gemacht wird. Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß der obere Bereich des Garraumes als eine aus dem Gehäuse ausgeformte Haube ausgebildet ist, daß der in die Haube eingezogene Reflektor unter Belassung eines Hohlraumes zur Haube hin im Ansatzbereich der Haube über einen ebenen Randbereich mit dem planen Gitter verbunden ist und daß der Reflektor mit seinem Gitter unter Bildung einer kapazitiven Mikrowellendichtung zwischen dem Gehäuse und dem ebenen Randbereich isoliert an dem Gehäuse befestigt ist. Damit ergibt ein sich kompakter Aufbau des Herdes, wobei der eigentliche Garraum durch das Gitter von dem in der Haube befindlichen Heizraum mit der Wärmeenergiequelle getrennt ist. Die Verbindung zwischen dem mit dem Gitter verbundenen Reflektor und dem Gehäuse erfolgt in der Trennungsebene zwischen dem Garraum einerseits und dem Heizraum andererseits unter Bildung einer kapazitiven Mikrowellendichtung zwischen dem Reflektor und dem Gehäuses da der Reflektor im Anlagebereich vom Gehäuse isoliert ist, und zwar vorzugsweise durch die auf das Blechgehäuse aufgebrachte Emailleschicht. Damit ergibt sich mit einfachen Mitteln eine wirkungsvolle Mikrowellendichtung im Übergangsbereich zwischen dem Garraum und dem Heizraum. Diese Dichtung sowie eine hohe Impedanz des zwischen der Reflektorrückseite und dem Gehäuse gebildeten Hohlraumes verhindern hohe Wandströme.The invention has for its object to design a combination cooker of the type mentioned in such a way that there is a compact structure with a clear separation between the cooking chamber and the space for receiving the heat energy source (boiler room) and that of the cooking chamber in the boiler room mentioned escaping microwave radiation is reduced to a minimum or made harmless. This object is achieved according to the invention in that the upper region of the cooking space is designed as a hood formed from the housing, that the reflector drawn into the hood, leaving a cavity to the hood, in the attachment region of the hood over a flat edge region with the plan Grid is connected and that the reflector with its grating is insulated from the housing to form a capacitive microwave seal between the housing and the flat edge region. This results in a compact construction of the cooker, the actual cooking space being separated from the heating space in the hood with the heat energy source by the grill. The connection between the reflector connected to the grating and the housing takes place in the parting plane between the cooking space on the one hand and the heating space on the other hand, forming a capacitive microwave seal between the reflector and the housing since the reflector is insulated from the housing in the contact area, preferably by the enamel layer applied to the sheet metal housing. With simple means, this results in an effective microwave seal in the transition area between the cooking space and the heating space. This seal and a high impedance of the cavity formed between the back of the reflector and the housing prevent high wall currents.

In Ausgestaltung der Erfindung ist der Reflektor durch Umbördelung seines Randbereiches an dem plan ausgeführten Gitter befestigt. Ferner ist das Gehäuse an seiner Ober­seite im Ansatzbereich der Haube mit einer umlaufenden Erhöhung zur Aufnahme des ebenen Reflektorrandbereiches mit dem Gitter versehen.In an embodiment of the invention, the reflector is attached to the flat grid by flanging its edge region. Furthermore, the top of the housing in the attachment area of the hood is provided with a circumferential elevation to accommodate the flat reflector edge area with the grating.

Eine einfache Montage des Reflektors und eine sichere Halterung ergibt sich vorzugsweise dadurch, daß der Reflektor mit Gitter über einen an der Innenseite des Reflektors angreifenden, federnd an der Außenseite der Haube abgestützten Keramikbolzen mit seinen ebenen Rand­bereichen gegen die stufenförmige Erhöhung des Gehäuses gedrückt ist. Diese Keramikhalterung ist beständig gegen hohe Temperaturen und hohe elektrische Feldstärken.A simple assembly of the reflector and a secure mounting preferably results from the fact that the reflector with grating is pressed with its flat edge regions against the step-like elevation of the housing by means of a ceramic bolt which engages on the inside of the reflector and is resiliently supported on the outside of the hood. This ceramic holder is resistant to high temperatures and high electrical field strengths.

Eine mehr oder weniger große, durch das Gitter in den Heizraum eindringende Reststrahlung hat zur Folge, daß sich die Mikrowellen längs der Heizenergiequelle, z. B. einer Heizwendel, ausbreiten. Die Ausbreitung längs eines gewendelten Teiles der Wärmeenergiequelle kann dadurch verhinderet werden, daß diese Heizwendel in Ausgestaltung der Erfindung eine hohe Impedanz für die durch das Gitter eindringende Reststrahlung besitzt. Die nicht gewendelten Zuleitungen des Heizdrahtes wirken jedoch als Antenne und ermöglichen die Ausbildung einer Koaxial-TEM-Welle. Dies führt zu Leuchterscheinungen und zu einer relativ hohen Mikrowellen-Leckstrahlung durch die in den Wänden der Haube angeordneten Durchführungen für die Wärmeenergie­quelle. Diese Nachteile können gemäß einer weiteren Ausgestaltung der Erfindung dadurch vermieden werden, daß das Gehäuse an seiner Außenseite im Bereich einer Durch­führung der Wärmeenergiequelle mit einem gegenüber dem Gehäuse elektrisch isolierten, winkelförmigen Abschirm­blech versehen ist, dessen einer Schenkel senkrecht zur Zuleitung der Wärmeenergiequelle verläuft und mit der Zuleitung elektrisch leitend verbunden ist, und dessen anderer, parallel zur Zuleitung verlaufender Schenkel an der Oberseite der Haube befestigt ist. Der rechtwinklig zur Zuleitung angeordnete Schenkel des Abschirmbleches verursacht einen Kurzschluß der Koaxial-TEM-Welle und führt zu einer Fehlanpassung bzw. zur Reflexion der Mikrowellenenergie. Der andere, horizontal verlaufende Schenkel des Abschirmbleches dient der zusätzlichen Mikrowellenabschirmung.A more or less large, penetrating through the grating in the boiler room residual radiation has the consequence that the microwaves along the heating energy source, for. B. a heating coil. The spread along a coiled part of the heat energy source can be prevented in that this heating coil in the embodiment of the invention has a high impedance for the residual radiation penetrating through the grating. However, the non-coiled leads of the heating wire act as an antenna and enable the formation of a coaxial TEM wave. This leads to lighting phenomena and to a relatively high microwave leakage radiation through the bushings for the heat energy source arranged in the walls of the hood. According to a further embodiment of the invention, these disadvantages can be avoided in that the housing on the outside in the area of a passage of the heat energy source with a Housing electrically insulated, angled shielding plate is provided, one leg of which runs perpendicularly to the supply line of the heat energy source and is electrically conductively connected to the supply line, and whose other leg running parallel to the supply line is fastened to the top of the hood. The leg of the shielding plate arranged at right angles to the feed line causes a short circuit in the coaxial TEM wave and leads to a mismatch or reflection of the microwave energy. The other, horizontally extending leg of the shielding plate is used for additional microwave shielding.

In einer weiteren Ausgestaltung ist der vertikale Schenkel des Abschirmbleches stirnseitig über ein U-förmiges Isolierstück und der horizontale Schenkel über eine isolierende Folie gegenüber dem emaillierten Gehäuse isoliert. Gehäuse und Abschirmblech bilden hier einen Kondensator geringer Kapazität. Dieser sperrt die anliegende Netzspannung gegenüber dem Gehäuse und schließt hochfrequente elektrische Potentiale kurz. Dadurch werden statische Aufladungen verhindert, die im Bereich der Lampendurchführung zu Leuchterscheinungen führen könnten.In a further embodiment, the vertical leg of the shielding plate is insulated from the front side by a U-shaped insulating piece and the horizontal leg is insulated from the enamelled housing by an insulating film. The housing and shielding plate form a capacitor of low capacitance. This blocks the mains voltage applied to the housing and short-circuits high-frequency electrical potentials. This prevents static charges that could lead to lighting effects in the area of the lamp leadthrough.

Die oben erwähnte, relativ hohe Leckstrahlung im Bereich der Durchführungen beruht darauf, daß die Durchführung und die Zuleitung einen Koaxialleiter für die Mikrowelle bilden, in dem sich eine Welle ausbreitet. Der nahe dieser Durchführung angebrachte, rechtwinklig zur Zuleitung verlaufende Teil des Abschirmbleches, das mit der Zuleitung elektrisch leitend verbunden ist, bildet einen niedrig-impedanten Abschluß für die Koaxialleitung, d. h. es entsteht ein Kurzschluß für die Welle. Eine derartigeThe relatively high leakage radiation in the area of the bushings mentioned above is based on the fact that the bushing and the feed line form a coaxial conductor for the microwave, in which a wave propagates. The part of the shielding plate which is arranged near this feed-through and runs at right angles to the feed line and is electrically conductively connected to the feed line forms a low-impedance termination for the coaxial line, that is to say a short circuit for the shaft. Such one

Fehlanpassung führt zur Reflexion der koaxialen Welle zurück ins Gehäuse. Dies wird vorzugsweise dadurch erreicht, daß der rechtwinklig zur Zuleitung stehende Schenkel des Abschirmbleches eine Abmessung besitzt, die mindestens gleich einem Viertel der Wellenlänge der Mikrowelle im freien Raum beträgt.Mismatch leads to reflection of the coaxial shaft back into the housing. This is preferably achieved in that the leg of the shielding plate which is at right angles to the feed line has a dimension which is at least equal to a quarter of the wavelength of the microwave in free space.

In der Zeichnung ist in den Fig. 1 bis 4 ein Ausführungs­beispiel des Gegenstandes gemäß der Erfindung schematisch dargestellt.

  • Fig. 1 zeigt in einer Draufsicht, zum Teil geschnitten, einen Teil eines Elektroherdes,
  • Fig. 2 zeigt einen Schnitt II-II gemäß Fig. 1,
  • Fig. 3 zeigt in einem anderen Maßstab einen Querschnitt III-III gemäß Fig. 2, und
  • Fig. 4 zeigt eine Einzelheit.
In the drawing, an embodiment of the object according to the invention is shown schematically in FIGS. 1 to 4.
  • 1 shows a top view, partly in section, of part of an electric cooker,
  • FIG. 2 shows a section II-II according to FIG. 1,
  • Fig. 3 shows on a different scale a cross section III-III according to FIG. 2, and
  • Fig. 4 shows a detail.

Der Elektroherd gemäß der Erfindung besitzt ein beidseitig emailliertes Gehäuse 10 aus Eisenblech, das an seiner Oberseite eine aus der oberen Gehäusewand ausgeformte Haube 11 zur Aufnahme und Lagerung einer Halogenlampe 12 in einem Heizraum 13 aufweist. Die Halogenlampe 12 besitzt einen gewendelten Heizleiter 14 und ungewendelte Zuleitun­gen 15 und ist in Durchführungen 11a der Haube 11 gelagert. Der Heizraum 13 mit der Halogenlampe 12 ist durch eine Glasplatte 16 vom Garraum 17 des Elektroherdes getrennt. In der Begrenzungsebene zwischen dem Garraum 17 und dem Heizraum 13 liegt ein Streckmetallgitter 18, das mit einem Reflektor 19 durch umgebördelte ebene Rand­ bereiche 20 elektrisch leitend verbunden ist. Die ebenen Randbereiche 20 des Reflektors liegen in einer umlaufenden stufenförmigen Erhöhung 21 der Oberseite des Gehäuses 10. Die Befestigung der aus dem Reflektor 19 und dem Gitter 18 bestehenden Einheit erfolgt über eine Keramikhülse 22, die einerseits mit einem Kragen 22a an der Innenseite des Reflektors 19 anliegt und andererseits über eine Feder 23 an der Außenseite der Haube 11 abgestützt ist. Dadurch werden die ebenen Randbereiche 20 durch Federdruck gegen die Erhöhung 21 gezogen. Die ebenen Randbereiche 20 bilden mit den emaillierten Wandbereichen der Erhöhung 21 eine kapazitive Mikrowellen-Dichtung, die zusammen mit der hohen Impedanz des Hohlraumes 13a zwischen der Rückseite des Reflektors 19 und der Wand der Haube 11 hohe Wandströme verhindern.The electric cooker according to the invention has a housing 10 made of sheet iron, which is enamelled on both sides and has a hood 11 formed on the upper side from the upper housing wall for receiving and storing a halogen lamp 12 in a heating chamber 13. The halogen lamp 12 has a coiled heating conductor 14 and uncoiled supply lines 15 and is mounted in bushings 11a of the hood 11. The heating chamber 13 with the halogen lamp 12 is separated from the cooking chamber 17 of the electric oven by a glass plate 16. In the boundary plane between the cooking chamber 17 and the heating chamber 13 there is an expanded metal grill 18, which is flanged with a reflector 19 by a flanged edge areas 20 is electrically connected. The flat edge regions 20 of the reflector lie in a circumferential step-shaped elevation 21 of the top of the housing 10. The unit consisting of the reflector 19 and the grating 18 is fastened via a ceramic sleeve 22, which on the one hand has a collar 22a on the inside of the reflector 19 abuts and on the other hand is supported by a spring 23 on the outside of the hood 11. As a result, the flat edge regions 20 are pulled against the elevation 21 by spring pressure. The flat edge regions 20, together with the enamelled wall regions of the elevation 21, form a capacitive microwave seal which, together with the high impedance of the cavity 13a between the rear of the reflector 19 and the wall of the hood 11, prevent high wall currents.

Die nicht gewendelten Zuleitungen 15 der Halogenlampe 12 wirken für die durch das Gitter 18 dringende Reststrahlung als Antenne und ermöglichen die Ausbildung einer Koaxial-­TEM-Welle entlang der Zuleitung 15. Dadurch können statische Aufladungen in der Lampe entstehen, die im Bereich der Lampendurchführung 11a zu Leuchterscheinungen führen. Dies wird durch ein winkelförmiges Abschirmblech 24 mit einem rechtwinklig zur Zuleitung 15 stehenden Schenkel 24a und einem parallel zur Zuleitung verlaufenden Schenkel 24b vermieden. Der Schenkel 24a ist mit der Zuleitung 15 elektrisch leitend verbunden. Der Schenkel 24a ist durch ein U-förmiges Isolierstück 25 und der Schenkel 24b durch eine isolierende Scheibe 26 gegenüber dem Gehäuse 10 bzw. der Haube 11 isoliert. Die Haube 11 und der Schenkel 24b bilden einen Kondensator geringer Kapazität, der die anliegende Netzspannung gegenüber dem Gehäuse sperrt und hochfrequente elektrische Potentiale kurzschließt. Dadurch wird das Entstehen der oben genannten Aufladungen und damit das Entstehen von Leuchterscheinungen verhindert.The non-coiled supply lines 15 of the halogen lamp 12 act as an antenna for the residual radiation penetrating through the grating 18 and enable the formation of a coaxial TEM wave along the supply line 15. This can result in static charges in the lamp which increase in the area of the lamp leadthrough 11a Lead lighting effects. This is avoided by an angled shielding plate 24 with a leg 24a perpendicular to the feed line 15 and a leg 24b running parallel to the feed line. The leg 24a is electrically conductively connected to the feed line 15. The leg 24a is insulated from the housing 10 or the hood 11 by a U-shaped insulating piece 25 and the leg 24b by an insulating disk 26. The hood 11 and the leg 24b form a capacitor of low capacitance, which blocks the mains voltage applied to the housing, and high-frequency electrical potentials shorts. This prevents the build-up of the above-mentioned charges and thus the appearance of lighting effects.

Durch den rechtwinklig zur Zuleitung 15 verlaufenden Schenkel 24a wird somit die in Form einer koaxialen Welle austretende Mikrowelle in die Haube 11 reflektiert, während der horizontal zur Zuleitung verlaufende Schenkel 24b durch seine abschirmende Wirkung eine weitere Verringerung der Leckstrahlung ermöglicht.The leg 24a running at right angles to the feed line 15 thus reflects the microwave emerging in the form of a coaxial wave into the hood 11, while the leg 24b running horizontally to the feed line enables a further reduction in the leakage radiation due to its shielding effect.

In Fig. 4 ist das winkelförmige Abschirmblech 24 dargestellt, dessen Schenkelbreite mit 27 bezeichnet ist.4, the angular shielding plate 24 is shown, the leg width of which is designated by 27.

Claims (10)

1. Elektroherd mit einem Garraum zum Garen von Speisen durch Zuführen von Wärme- und/oder Mikrowellenenergie, wobei die Wärmeenergiequelle z. B. in einem oberen Bereich des Garraumes befestigt ist, der einen Reflektor aufweist und durch ein metallisches, mit dem Reflektor elektrisch leitend verbundenes Gitter vom Garraum abgetrennt ist, dadurch gekennzeichnet, daß der obere Bereich des Gar­raumes als eine aus dem Gehäuse (10) ausgeformte Haube (11) ausgebildet ist, daß der in die Haube (11) eingezogene Reflektor (19) unter Belassung eines Hohl­raumes (13a) zur Haube (11) hin im Ansatzbereich der Haube (11) über einen ebenen Randbereich (20) mit dem planen Gitter (18) verbunden ist und daß der Reflektor (19) mit seinem Gitter (18) unter Bildung einer kapazitiven Mikro­wellendichtung zwischen dem Gehäuse (10, 21) und dem ebenen Randbereich (20) isoliert am Gehäuse (10, 21) befestigt ist.1. Electric stove with a cooking space for cooking food by supplying heat and / or microwave energy, the heat energy source z. B. is fixed in an upper region of the cooking chamber, which has a reflector and is separated from the cooking chamber by a metallic grid which is electrically conductively connected to the reflector, characterized in that the upper region of the cooking chamber is shaped as a housing (10) Hood (11) is designed so that the reflector (19) drawn into the hood (11) leaves a cavity (13a) towards the hood (11) in the attachment area of the hood (11) over a flat edge area (20) with the plan Grid (18) is connected and that the reflector (19) with its grating (18) is insulated on the housing (10, 21) with the formation of a capacitive microwave seal between the housing (10, 21) and the flat edge region (20). 2. Elektroherd nach Anspruch 1, dadurch gekennzeichnet, daß das Gehäuse (10) außen und innen mit einer isolieren­den Schicht, z. B. aus Emaille, versehen ist.2. Electric cooker according to claim 1, characterized in that the housing (10) outside and inside with an insulating layer, for. B. is made of enamel. 3. Elektroherd nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, daß der Reflektor (19) durch Umbördelung seines Randbereiches (20) am Gitter (18) befestigt ist.3. Electric cooker according to claim 1 or 2, characterized in that the reflector (19) is fixed to the grid (18) by flanging its edge region (20). 4. Elektroherd nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Gehäuse (10) im Ansatzbereich der Haube (11) mit einer umlaufenden Erhöhung (21) versehen ist.4. Electric cooker according to one of claims 1 to 3, characterized in that the housing (10) in the attachment region of the hood (11) is provided with a circumferential elevation (21). 5. Elektroherd nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet. daß der Reflektor (19) über einen an der Innenseite des Reflektors (19) angreifenden, federnd an der Außenseite der Haube (11) abgestützten Keramikbolzen (22) mit seinen ebenen Randbereichen (20) gegen die stufenförmige Erhöhung (21) des Gehäuses (10) gedrückt ist.5. Electric cooker according to one of claims 1 to 4, characterized . that the reflector (19) engages on the inside of the reflector (19), resiliently supported on the outside of the hood (11) ceramic bolt (22) with its flat edge areas (20) against the step-like elevation (21) of the housing (10 ) is pressed. 6. Elektroherd nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Gehäuse (10, 11) an seiner Außen­seite im Bereich einer Durchführung (11a) der Wärme­energiequelle (12) mit einem gegenüber dem Gehäuse (10, 11) elektrisch isolierten winkelförmigen Abschirmblech (24) versehen ist, dessen einer Schenkel (24a) rechtwink­lig zur Zuleitung (15) der Wärmeenergiequelle (12) verläuft und mit dieser (15) elektrisch leitend verbunden ist (24c). und dessen anderer, parallel zur Zuleitung (15) verlaufender Schenkel (24b) an der Oberseite der Haube (11) befestigt ist.6. Electric cooker according to one of claims 1 to 5, characterized in that the housing (10, 11) on its outside in the region of a passage (11a) of the heat energy source (12) with an angularly electrically insulated from the housing (10, 11) Shielding plate (24) is provided, one leg (24a) of which runs at right angles to the feed line (15) of the heat energy source (12) and is electrically conductively connected to this (15) (24c). and the other leg (24b), which runs parallel to the feed line (15), is fastened to the top of the hood (11). 7. Elektroherd nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der die Wärmeenergiequelle (12) aufnehmende Heizraum (13) durch eine Glasplatte (16) vom Garraum (17) getrennt ist.7. Electric stove according to one of claims 1 to 6, characterized in that the heat energy source (12) receiving the heating chamber (13) by a glass plate (16) from the cooking chamber (17) is separated. 8. Elektroherd nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß als Wärmeenergiequelle (12) eine Halogenlampe vorgesehen ist, deren gewendelte Heizwicklung (14) eine durch Fehlanpassung bewirkte hohe Impedanz aufweist.8. Electric cooker according to one of claims 1 to 7, characterized in that as a heat energy source (12) Halogen lamp is provided, the coiled heating winding (14) of which has a high impedance caused by mismatching. 9. Elektroherd nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der vertikale Schenkel (24a) des Abschirmbleches (24) stirnseitig über ein U-förmiges Isolierstück (25) und der horizontale Schenkel (24b) über eine Isolierfolie (24) gegenüber der emaillierten Ober­fläche des Gehäuses (10, 11) isoliert ist.9. Electric cooker according to one of claims 1 to 8, characterized in that the vertical leg (24a) of the shielding plate (24) on the end face via a U-shaped insulating piece (25) and the horizontal leg (24b) via an insulating film (24) opposite the enamelled surface of the housing (10, 11) is insulated. 10. Elektroherd nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der rechtwinklig zur Zuleitung (15) stehende Schenkel (24a) eine Breite (27) aufweist, die mindestens gleich ist einem Viertel der Wellenlänge im freien Raum der über die Zuleitung (15) aus der Haube (11) austretenden Mikrowelle.10. Electric cooker according to one of claims 1 to 9, characterized in that the leg (24a) perpendicular to the feed line (15) has a width (27) which is at least equal to a quarter of the wavelength in the free space via the feed line ( 15) microwave emerging from the hood (11).
EP90202450A 1989-09-23 1990-09-17 Electric oven Expired - Lifetime EP0420319B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3931859 1989-09-23
DE3931859A DE3931859A1 (en) 1989-09-23 1989-09-23 ELECTRIC COOKER

Publications (2)

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EP0420319A1 true EP0420319A1 (en) 1991-04-03
EP0420319B1 EP0420319B1 (en) 1993-09-29

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ID=6390086

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EP90202450A Expired - Lifetime EP0420319B1 (en) 1989-09-23 1990-09-17 Electric oven

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US (1) US5147993A (en)
EP (1) EP0420319B1 (en)
DE (2) DE3931859A1 (en)

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US6263830B1 (en) 1999-04-12 2001-07-24 Matrix Integrated Systems, Inc. Microwave choke for remote plasma generator
GB2353897B (en) * 1999-08-31 2002-02-20 Lg Electronics Inc Microwave lighting apparatus
DE10048158A1 (en) 2000-09-28 2002-04-11 Bsh Bosch Siemens Hausgeraete Microwave oven with microwave source and screened IR radiant, has microwave screening grid reflecting IR into oven.
US6521870B2 (en) 2001-01-11 2003-02-18 General Electric Company Thermal/convection oven including halogen lamps
DE10114021B4 (en) * 2001-03-22 2005-09-08 Forschungszentrum Karlsruhe Gmbh Thermal radiation device for additional targeted thermal processing of an object in a microwave oven
US6867399B2 (en) * 2003-03-14 2005-03-15 General Electric Company Methods and apparatus for operating a speedcooking oven

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Also Published As

Publication number Publication date
DE3931859A1 (en) 1991-04-04
DE59002914D1 (en) 1993-11-04
EP0420319B1 (en) 1993-09-29
US5147993A (en) 1992-09-15

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