EP0003764B1 - Double baking oven, particularly built-in baking oven - Google Patents

Double baking oven, particularly built-in baking oven Download PDF

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Publication number
EP0003764B1
EP0003764B1 EP79100334A EP79100334A EP0003764B1 EP 0003764 B1 EP0003764 B1 EP 0003764B1 EP 79100334 A EP79100334 A EP 79100334A EP 79100334 A EP79100334 A EP 79100334A EP 0003764 B1 EP0003764 B1 EP 0003764B1
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EP
European Patent Office
Prior art keywords
baking oven
housing
double
oven
further characterized
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP79100334A
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German (de)
French (fr)
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EP0003764A1 (en
Inventor
Julius Dipl.-Ing. Husslein
Johann Klement
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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Filing date
Publication date
Priority claimed from DE19782806158 external-priority patent/DE2806158C2/en
Priority claimed from DE19782825461 external-priority patent/DE2825461A1/en
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0003764A1 publication Critical patent/EP0003764A1/en
Application granted granted Critical
Publication of EP0003764B1 publication Critical patent/EP0003764B1/en
Expired 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
    • H05B6/647—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/006—Arrangements for circulation of cooling air

Definitions

  • the invention relates to a double oven according to the preamble of claim 1.
  • the present invention is based on the object of designing a double oven in accordance with the preamble of patent claim 1 in such a way that, in particular in view of the limited thermal load capacity of electrical or electronic components, strong heat development in the upper housing area is avoided.
  • the air duct channels open above the upper screen plate into an air duct space delimited by the upper oven on the one hand and by the housing on the other hand.
  • the cooling air flowing in on the underside of the device thus flows around the upper oven and the control and regulating devices arranged above this oven at a relatively low temperature and is discharged directly via the blower and exhaust duct.
  • an exhaust duct connected to the cooking chamber of the upper oven opens into the exhaust duct.
  • the main air flow caused by the blower exerts a suction effect on the exhaust air coming from the cooking space, which favors the removal of this exhaust air.
  • a further advantageous embodiment of the invention is given in that in the lower housing area the side and rear walls form a frame to which the lower oven is attached and which has slide rails in the upper area on which the microwave oven is a complete unit in the frame can be inserted and fastened by means of preferably adjustable fastening means.
  • the fastening means being adjustable so that the front surfaces of the two ovens can be exactly aligned.
  • the fan associated with the microwave generator is located with its suction side in the immediate vicinity of a cooling air inlet opening in the housing. In this way it is prevented that this blower sucks in the heated air flowing around the two ovens or it is ensured that this blower can take its cooling air directly from the outside.
  • a horizontal ventilation bar is arranged on the upper baking oven, which is connected to a largely closed warm air outlet duct with part, preferably over two thirds of its length, and forms the cooling air inlet opening with its remaining length.
  • the thermally highly stressed or heat-sensitive electrical and electronic components are placed in the cooling air flow path between the suction side of the blower assigned to the microwave generator and preferably arranged on the housing rear wall and housing side wall.
  • the blower associated with the microwave generator is additionally used for the intensive cooling of particularly stressed or particularly sensitive components, the cooling of which would not be as intensive due to the general warm air flow rising in the housing.
  • the double oven shown in the figures is e.g. Built-in built-in furniture made of wooden panels, which consists of side panels 1 and 2, a cover panel 3 and a base panel 4 and forms an installation space for the double oven.
  • a lower oven 11 is installed, which has a front door 12 with glass front panel 13 and handle 14 and conventional heating elements, e.g. has a grill heater 15, and top and bottom heat, and above it an upper oven 16, which is designed as a microwave oven and a cooking chamber 17 and a microwave generator, microwave guide and microwave antenna, e.g.
  • the microwave oven 16 has its own ventilation system with a blower 24, an air duct 25 in which the magnetron or cooling surfaces are located, with injection openings 26, with outlet openings 27 in the rear wall of the muffle, and with an L-shaped one attached to the rear wall of the muffle Exhaust duct 28 rectangular cross-section. Both ovens are framed with thermal insulation layers e.g. 29.
  • the lower oven 11 is attached to the rear wall 8 and to the side walls 6, 7 by means of oven holders 30 and oven support 31 attached to the rear wall 8, which are attached to the side walls 6, 7.
  • oven holders 30 and oven support 31 attached to the rear wall 8, which are attached to the side walls 6, 7.
  • horizontal slide rails 32 on which the microwave oven as a complete unit in the upper installation space of the Housing or frame can be inserted and locked by means of bearing brackets 33.
  • the bearing brackets 33 e.g. by means of an elongated hole guide, adjustably attached to the oven 16 and the bearing brackets 33 are also similarly opposite or with the associated slide rails 32, e.g. by means of screws, adjustable and connectable.
  • the two ovens belonging, generally designated 34, electrical or electronic control, regulating and operating devices are accommodated.
  • a blow-out duct 35 which is only open on two opposite sides is fastened, one open side of which opens into front-side, upwardly directed outlet openings 36 and in the other open side the blow-out side of one also fastened to the lid 10 Blower 37 opens.
  • the blow-out duct 35 has a further opening 38 which, when the cover is placed on the fully equipped housing, is flush with the free end of the exhaust duct 28 of the microwave oven 16 and is connected therewith.
  • the outer structure of the double oven also consists of a front-side, all-round and over the boundary plates of the built-in furniture Lisene 39 made of profile material, which has 40 cooling air inlet openings 41 on the lowest pilast crossbar and the already mentioned outlet openings 36 on the pilast crossbar.
  • the cooling air sucked in at the inlet openings 41 thus enters the cooling air channels 45, 44, 43 bypassing the lower oven 11, rises as a result of natural convection and as a result of the suction of the fan 37, flows through the ventilation space 48 and the control and regulating devices 34 and is guided from the suction side of the fan 37 into the blow-out duct 35 and from there into the open.
  • the forced flow exerts a suction effect on the exhaust duct 28, which favors the removal of the exhaust air coming from the cooking space of the oven 16.
  • the double oven shown in FIGS. 4 to 6 is installed in a built-in piece of furniture, not shown, for example made of wooden plates, which can consist of side plates, a cover plate and a base plate and forms an installation space for the double oven.
  • the outer boundary of the double oven inserted into the installation space of the built-in furniture is formed by a housing 101, by opposite side walls 102 and 103, by a rear wall 104, by a base 105 and by a cover 106.
  • a lower oven 107 is installed, which can have a folding door on the front with glass front plate 109 and handle 110 as well as conventional heating elements, e.g.
  • a horizontal cooling air shaft 116 runs between the lower screen base 115 and the housing base 105, which opens into cooling air inlet openings 117 of a lower ventilation strip 118.
  • the upper housing area with the upper oven 111 is shown as a detail in FIG. 6.
  • a switch panel 119 placed above the upper oven 111 on the front of the housing and assigned to both ovens is shown shifted upward.
  • the switch panel 119 which has a time switch 120 and controls 121, is limited at the top by a ventilation strip 122 which has a warm air outlet opening which in the exemplary embodiment extends over two thirds of the strip length and which has a cooling air inlet opening 124 which extends approximately over extends a third of the length of the last.
  • Connected to the warm air outlet opening 123 is a largely closed warm air outlet duct 125, into which the blower side of a crossflow fan 126 and an exhaust duct 127 connected to the interior of the oven 111 open on the side opposite the ventilation strip.
  • a microwave generator with transformer 129 is arranged within the ventilation space in the uppermost housing area, which is delimited by the upper limit of the oven 11 at the bottom and by the housing cover 106, and which is arranged in the flow path of a cooling air shaft 130, which cooling air shaft 130 on the one hand the blow side of a special fan 131 is connected and on the other hand opens into the cooking space of the upper oven 111.
  • the blower 131 is placed in such a way that its suction side is immediately behind the cooling air inlet opening 124 of the ventilation strip 122, so that the blower 131 can suck in cooling air directly from the outside, as indicated by arrows. This flow of cooling air flows through the cooling air shaft 130 and thereby intensively cools the microwave generator 128.
  • the warm or hot exhaust air from the interior of the oven is conducted via the exhaust air shaft 127 into the exhaust duct 125 and together with the air flowing around and into the two ovens the upper housing area by natural convection and by suction (fan 126) warm air flowing in through the outlet opening 123 to the outside.
  • FIG. 6 shows that the suction side of the fan 131 is arranged off-center in the ventilation space in the vicinity of the housing side wall 102, as are electrical or electronic components or components which are thermally highly stressed or are very heat-sensitive.
  • the latter side wall 102 has significantly more cooling air inlet openings 132 compared to the opposite side wall 103, which are arranged in addition to the lower inlet openings 133 arranged in both side walls in the vicinity of the uppermost boundary of the side wall 102.
  • Such inlet openings can additionally be provided in the rear wall 104 of the housing.

Description

Die Erfindung geht aus von einem Doppelbackofen gemäss dem Oberbegriff des Patentanspruches 1.The invention relates to a double oven according to the preamble of claim 1.

Bei einem bekannten Doppelbackofen (DE-U-70 27 952) sind zwei durch konventionelle Heizeinrichtungen beheizbare Backöfen übereinander in einem beiden Backöfen gemeinsamen Gehäuse untergebracht. Oberhalb des oberen Backofens befindet sich eine Absaugvorrichtung, welche die von beiden Backöfen aus nach oben aufsteigende erhitzte Luft ansaugt und nach aussen abführt. Dadurch, dass die beim Betrieb der Backöfen entstehende Wärme im gemeinsamen Gehäuse frei aufsteigen kann, ist im oberen Gehäusebereich die Bildung eines Wärmestaues zu befürchten, welcher die Funktionsweise der ebenfalls im oberen Gehäusebereich untergebrachten Schalt-und Regeleinrichtungen beeinträchtigen kann.In a known double oven (DE-U-70 27 952), two ovens that can be heated by conventional heating devices are accommodated one above the other in a housing common to both ovens. Above the upper oven there is a suction device which sucks in the heated air rising from both ovens and removes it to the outside. The fact that the heat generated during operation of the ovens can rise freely in the common housing means that there is a risk of heat build-up in the upper housing area, which can impair the functioning of the switching and control devices which are also housed in the upper housing area.

Es ist bei Einzelbacköfen (DE-B-2310290) bekannt, zwischen der Backofenmuffel und einem Aussengehäuse Luftführungskanäle vorzusehen, wobei am unteren Gehäusebereich Einlassöffnungen für Kühlluft vorgesehen sind, während im oberen Gehäusebereich ein Gebläse angeordnet ist, das blasseitig in einen im wesentlichen geschlossenen, ins Freie führenden Ausblaskanal einmündet. Es hat sich nun gezeigt, dass bei einem Einzelbackofen ein derartiges Kühlluftsystem ausreichend ist, nicht jedoch bei einem Doppelbackofen mit zwei übereinander angeordneten Backöfen, bei welchem sich die Wärmeentwicklung der beiden Backöfen addiert und im oberen Gehäusebereich, in welchem üblicherweise die elektrischen oder elektronischen Schalt- und Regeleinrichtungen untergebracht sind, zu einer Wärmeentwicklung führt, welche die Funktionsweise insbesondere der elektronischen Einrichtungen beeinträchtigt.It is known in single ovens (DE-B-2310290) to provide air guide channels between the oven muffle and an outer housing, with inlet openings for cooling air being provided on the lower housing area, while a fan is arranged in the upper housing area, which blows into an essentially closed, ins Free leading exhaust duct opens. It has now been shown that such a cooling air system is sufficient for a single oven, but not for a double oven with two ovens arranged one above the other, in which the heat development of the two ovens is added and in the upper housing area, in which usually the electrical or electronic switching and control devices are housed, leads to heat development, which affects the functioning of the electronic devices in particular.

Bei einem anderen bekannten Doppelbackofen (US-A-3 430 023) sind in einem gemeinsamen Ofengehäuse ein unten liegender konventioneller Backofen mit elektrischen oder durch Gas betriebenen Heizelementen und darüber ein Mikrowellenofen angeordnet. Hierbei besteht das Problem, dass durch den konventionellen Backofen insbesondere der oberste Gehäuseraum, in dem die elektrischen oder elektronischen Einrichtungen untergebracht sind, so stark aufgeheizt wird, dass die vorgenannten Einrichtungen Schaden erleiden.In another known double oven (US-A-3 430 023), a conventional oven located at the bottom with electric or gas-operated heating elements and a microwave oven are arranged in a common oven housing. The problem here is that the conventional oven, in particular the top housing space in which the electrical or electronic devices are housed, is heated up to such an extent that the aforementioned devices suffer damage.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Doppelbackofen gemäss dem Oberbegriff des Patentanspruches 1 so auszugestalten, dass insbesondere im Hinblick auf die begrenzte thermische Belastbarkeit von elektrischen oder elektronischen Bauelementen eine starke Wärmeentwicklung im oberen Gehäusebereich vermieden wird.The present invention is based on the object of designing a double oven in accordance with the preamble of patent claim 1 in such a way that, in particular in view of the limited thermal load capacity of electrical or electronic components, strong heat development in the upper housing area is avoided.

Diese Aufgabe wird gemäss der Erfindung gelöst durch die im Kennzeichnungsteil des Patentanspruches 1 aufgeführten Merkmale. Durch die besondere Art der Luftführung in Verbindung mit der Anordnung der Einlass- und Auslassöffnungen wird erreicht, dass die an der unteren Gehäusebegrenzung angesaugte Kühlluft bei weitgehender Umgebung des unteren Backofens unmittelbar und mit einer relativ niedrigen Temperatur in den oberen Gehäusebereich strömen kann und mit Sicherheit eine unzuträgliche Erwärmung der in diesem oberen Gehäusebereich angeordneten Steuer- und Regeleinrichtungen verhindert. Dies ist besonders wichtig bei Verwendung von elektronischen Bauelementen, bei denen eine Umgebungstemperatur von ca. 70°C nicht überschritten werden soll.This object is achieved according to the invention by the features listed in the characterizing part of claim 1. Due to the special type of air flow in connection with the arrangement of the inlet and outlet openings, the cooling air sucked in at the lower housing limit can flow into the upper housing area directly and with a relatively low temperature and with certainty if the lower oven is largely in the vicinity prevents undue heating of the control and regulating devices arranged in this upper housing area. This is particularly important when using electronic components where an ambient temperature of approx. 70 ° C should not be exceeded.

Gemäss einer weiteren Ausgestaltung der Erfindung münden die Luftführungskanäle oberhalb der oberen Schirmplatte in einen durch den oberen Backofen einerseits und durch das Gehäuse andererseits begrenzten Luftführungsraum ein. Die an der Geräteunterseite einströmende Kühlluft-umströmt damit mit relativ niedriger Temperatur sehr intensiv den oberen Backofen sowie die oberhalb dieses Backofens angeordneten Steuer- und Regeleinrichtungen und wird unmittelbar über Gebläse und Ausblaskanal abgeführt.According to a further embodiment of the invention, the air duct channels open above the upper screen plate into an air duct space delimited by the upper oven on the one hand and by the housing on the other hand. The cooling air flowing in on the underside of the device thus flows around the upper oven and the control and regulating devices arranged above this oven at a relatively low temperature and is discharged directly via the blower and exhaust duct.

Gemäss einer Weiterbildung der Erfindung mündet in den Ausblaskanal ein mit dem Garraum des oberen Backofens in Verbindung stehender Abluftschacht ein. Hierbei übt der durch das Gebläse zur Strömung veranlasste Hauptluftstrom auf die vom Garraum herkommende Abluft eine Saugwirkung aus, welche die Abführung dieser Abluft begünstigt.According to a development of the invention, an exhaust duct connected to the cooking chamber of the upper oven opens into the exhaust duct. The main air flow caused by the blower exerts a suction effect on the exhaust air coming from the cooking space, which favors the removal of this exhaust air.

Eine weitere vorteilhafte Ausgestaltung der Erfindung ist dadurch gegeben, dass im unteren Gehäusebereich die Seiten- und Rückwände einen Rahmen bilden, an welchem der untere Backofen befestigt ist und welcher im oberen Bereich Gleitschienen besitzt, auf denen der Mikrowellen-Backofen als komplette Baueinheit in den Rahmen einschiebbar und mittels vorzugsweise justierbarer Befestigungsmittel befestigbar ist. In besonders einfacher und wirtschaftlicher Weise ergibt sich somit die Möglichkeit, den Mikrowellen-Backofen in getrennter Fertigung komplett zu erstellen und mit wenigen Handgriffen in das Gehäuse einzusetzen, wobei durch die Justierbarkeit der Befestigungsmittel eine exakte Fluchtung der Frontflächen der beiden Backöfen erzielt werden kann.A further advantageous embodiment of the invention is given in that in the lower housing area the side and rear walls form a frame to which the lower oven is attached and which has slide rails in the upper area on which the microwave oven is a complete unit in the frame can be inserted and fastened by means of preferably adjustable fastening means. In a particularly simple and economical manner, there is thus the possibility of producing the microwave oven completely in separate production and inserting it into the housing in a few simple steps, with the fastening means being adjustable so that the front surfaces of the two ovens can be exactly aligned.

Gemäss einer weiteren vorteilhaften Ausgestaltung der Erfindung befindet sich das dem Mikrowellengenerator zugeordnete Gebläse mit seiner Saugseite in unmittelbarer Nähe einer Kühlluft-Einlassöffnung im Gehäuse. Auf diese Weise wird verhindert, dass dieses Gebläse die die beiden Backöfen umströmende erwärmte Luft ansaugt bzw. es wird sichergestellt, dass dieses Gebläse seine Kühlluft unmittelbar von aussen her entnehmen kann.According to a further advantageous embodiment of the invention, the fan associated with the microwave generator is located with its suction side in the immediate vicinity of a cooling air inlet opening in the housing. In this way it is prevented that this blower sucks in the heated air flowing around the two ovens or it is ensured that this blower can take its cooling air directly from the outside.

Hierbei ist es besonders vorteilhaft, wenn an der Gehäusefrontseite oberhalb des Schaltertableaus des oberen Backofens eine horizontale Lüftungsleiste angeordnet ist, die mit einem Teil, vorzugsweise über zwei Drittel ihrer Länge, an einen weitgehend geschlossenen Warmluft-Ausblaskanal angeschlossen ist und mit ihrer Restlänge die Kühlluft-Einlassöffnung bildet.It is particularly advantageous here if on the housing front above the switch a horizontal ventilation bar is arranged on the upper baking oven, which is connected to a largely closed warm air outlet duct with part, preferably over two thirds of its length, and forms the cooling air inlet opening with its remaining length.

Gemäss einer weiteren vorteilhaften Ausgestaltung der Erfindung sind im Kühlluftströmungsweg zwischen der Saugseite des dem Mikrowellengenerator zugeordneten Gebläses und vorzugsweise an Gehäuse-Rückwand und Gehäuse-Seitenwand angeordneten Kühlluft-Einlassöffnungen die thermisch hochbelasteten bzw. wärmeempfindlichen elektrischen und elektronischen Bauteile plaziert. Auf diese Weise wird das dem Mikrowellengenerator zugeordnete Gebläse zusätzlich noch ausgenützt für die intensive Kühlung besonders belasteter bzw. besonders empfindlicher Bauteile, deren Kühlung durch den allgemeinen, im Gehäuse hochsteigenden Warmluftstrom nicht so intensiv wäre.According to a further advantageous embodiment of the invention, the thermally highly stressed or heat-sensitive electrical and electronic components are placed in the cooling air flow path between the suction side of the blower assigned to the microwave generator and preferably arranged on the housing rear wall and housing side wall. In this way, the blower associated with the microwave generator is additionally used for the intensive cooling of particularly stressed or particularly sensitive components, the cooling of which would not be as intensive due to the general warm air flow rising in the housing.

Die Erfindung ist anhand von in der Zeichnung dargestellten Ausführungsbeispielen nachstehend erläutert.The invention is explained below with reference to exemplary embodiments shown in the drawing.

Es zeigt:

  • Fig. 1 eine Schnittansicht des erfindungsgemässen Doppelbackofens gemäss der Schnittlinie I-I in Fig. 2,
  • Fig. 2 eine Draufsicht auf den nach oben hin geöffneten Doppelbackofen gemäss Fig. 1,
  • Fig. 3 eine Vorderansicht des Doppelbackofens mit in der einen Hälfte geschlossener und in der anderen Hälfte geöffneter Gehäusefrontseite,
  • Fig. 4 und 5 eine andere Ausführungsform des erfindungsgemässen Doppelbackofens in zwei unterschiedlichen perspektivischen Ansichten,
  • Fig. 6 die Explosionsdarstellung einer Einzelheit des Doppelbackofens gemäss den Figuren 4 und 5.
It shows:
  • 1 is a sectional view of the double oven according to the invention along the section line II in Fig. 2,
  • 2 shows a top view of the double oven according to FIG. 1 which is open towards the top,
  • 3 shows a front view of the double oven with the front of the housing closed in one half and open in the other half,
  • 4 and 5 another embodiment of the double oven according to the invention in two different perspective views,
  • 6 shows the exploded view of a detail of the double oven according to FIGS. 4 and 5.

Der in den Figuren dargestellte Doppelbackofen ist in ein z.B. aus Holzplatten gebildetes Einbaumöbel eingebaut, das aus Seitenplatten 1 und 2, einer Deckplatte 3 und einer Bodenplatte 4 besteht und einen Einbauraum für den Doppelbackofen bildet.The double oven shown in the figures is e.g. Built-in built-in furniture made of wooden panels, which consists of side panels 1 and 2, a cover panel 3 and a base panel 4 and forms an installation space for the double oven.

Mit 5 ist die Küchenanstellwand bezeichnet. Die äussere Begrenzung des in den Einbauraum des Einbaumöbels eingesetzten Doppelbackofens ist gebildet durch gegenüberliegende Seitenwände 6 und 7, durch eine Rückwand 8, durch eine untere Schirmplatte 9 sowie durch einen oberen Deckel 10 (Fig. 1). In dieses durch die genannten Teile gebildetes Gehäuse oder Rahmen eingebaut ist ein unterer Backofen 11, der eine frontseitige Klapptür 12 mit Glasfrontplatte 13 und Handgriff 14 sowie konventionelle Heizelemente, z.B. einen Grillheizkörper 15, sowie Ober-und Unterhitze besitzt, sowie darüberliegend ein oberer Backofen 16, der als Mikrowellenbackofen ausgeführt ist und einen Garraum 17 sowie einen Mikrowellengenerator, Mikrowellenleiter und Mikrowellenantenne, z.B. ein Magnetron 18, einen an sich bekannten luftangetriebenen Feldrührer 19 innerhalb einer dielektrischen Abdeckung 20, einen Drehteller 21 und dergleichen aufweist und der an der Frontseite ebenfalls durch eine Klapptür 22 mit Glasfrontplatte 23 und Handgriff 14verschliessbar ist. Der Mikrowellen-Backofen 16 besitzt ein eigenes Lüftungssystem mit einem Gebläse 24, einem Luftkanal 25, in welchem das Magnetron bzw. Kühlflächen desselben liegen, mit Einblasöffnungen 26, mit Ausblasöffnungen 27 in der Muffelrückwand, sowie mit einem an der Muffelrückwand befestigten, L-förmigen Abluftschacht 28 rechteckigen Querschnitts. Beide Backöfen sind eingefasst mit Wärmedämmschichten z.B. 29.With 5 the kitchen wall is indicated. The outer boundary of the double oven used in the installation space of the built-in furniture is formed by opposite side walls 6 and 7, by a rear wall 8, by a lower screen plate 9 and by an upper cover 10 (FIG. 1). In this housing or frame formed by the mentioned parts, a lower oven 11 is installed, which has a front door 12 with glass front panel 13 and handle 14 and conventional heating elements, e.g. has a grill heater 15, and top and bottom heat, and above it an upper oven 16, which is designed as a microwave oven and a cooking chamber 17 and a microwave generator, microwave guide and microwave antenna, e.g. a magnetron 18, a known air-driven field stirrer 19 within a dielectric cover 20, a turntable 21 and the like and which can also be closed at the front by a hinged door 22 with a glass front plate 23 and handle 14. The microwave oven 16 has its own ventilation system with a blower 24, an air duct 25 in which the magnetron or cooling surfaces are located, with injection openings 26, with outlet openings 27 in the rear wall of the muffle, and with an L-shaped one attached to the rear wall of the muffle Exhaust duct 28 rectangular cross-section. Both ovens are framed with thermal insulation layers e.g. 29.

Der untere Backofen 11 ist an der Rückwand 8 sowie an den Seitenwänden 6, 7 befestigt mittels an der Rückwand 8 befestigten Backofenhaltern 30 und Backrohrträgern 31, die an den Seitenwänden 6, 7 befestigt sind. Zur Befestigung des Mikrowellenbackofens 16 dienen ebenfalls Backrohrträger 31 an den Seitenwänden 6 und 7, rückwärtige Backofenhalter 30 sowie beidseitig des Backofens 16 an den Teilen 30 und 31 befestigte, horizontale Gleitschienen 32, auf welchen der Mikrowellen-Backofen als komplette Baueinheit in den oberen Einbauraum des Gehäuses oder Rahmens mittels Lagerwinkeln 33 einschiebbar und arretierbar ist. Um eine exakte ebene Fluchtung der Glasfrontseiten 13 und 23 der beiden Backöfen 11, 16 zu erhalten, sind die Lagerwinkel 33, z.B. durch Langlochführung, am Backofen 16 verstellbar angesetzt und die Lagerwinkel 33 sind ferner in ähnlicher Weise gegenüber bzw. mit den zugeordneten Gleitschienen 32, z.B. mittels Schrauben, justier- und verbindbar.The lower oven 11 is attached to the rear wall 8 and to the side walls 6, 7 by means of oven holders 30 and oven support 31 attached to the rear wall 8, which are attached to the side walls 6, 7. To attach the microwave oven 16 also serve oven support 31 on the side walls 6 and 7, rear oven holder 30 and on both sides of the oven 16 on the parts 30 and 31 attached, horizontal slide rails 32 on which the microwave oven as a complete unit in the upper installation space of the Housing or frame can be inserted and locked by means of bearing brackets 33. In order to obtain an exact, level alignment of the glass front sides 13 and 23 of the two ovens 11, 16, the bearing brackets 33, e.g. by means of an elongated hole guide, adjustably attached to the oven 16 and the bearing brackets 33 are also similarly opposite or with the associated slide rails 32, e.g. by means of screws, adjustable and connectable.

In einem Gehäuseraum oberhalb des oberen Backofens 16 sind die beiden Backöfen zugehörigen, allgemein mit 34 bezeichneten elektrischen bzw. elektronischen Steuer-, Regel- und Bedienungseinrichtungen untergebracht. An der Unterseite des den Doppelbackofen nach oben begrenzenden Deckels 10 ist ein nur an zwei gegenüberliegenden Seiten offener Ausblaskanal 35 befestigt, dessen eine offene Seite in frontseitige, nach oben gerichtete Auslassöffnungen 36 einmündet und in dessen andere offene Seite die Ausblasseite eines ebenfalls am Deckel 10 befestigten Gebläses 37 einmündet. Der Ausblaskanal 35 besitzt eine weitere Öffnung 38, welche beim Aufsetzen des Deckels auf das fertigbestückte Gehäuse mit dem freien Ende des Abluftschachtes 28 des Mikrowellen-Backofens 16 fluchtet und damit in Verbindung steht.In a housing space above the upper oven 16, the two ovens belonging, generally designated 34, electrical or electronic control, regulating and operating devices are accommodated. On the underside of the lid 10 which delimits the top of the double oven, a blow-out duct 35 which is only open on two opposite sides is fastened, one open side of which opens into front-side, upwardly directed outlet openings 36 and in the other open side the blow-out side of one also fastened to the lid 10 Blower 37 opens. The blow-out duct 35 has a further opening 38 which, when the cover is placed on the fully equipped housing, is flush with the free end of the exhaust duct 28 of the microwave oven 16 and is connected therewith.

Der äussere Aufbau des Doppelbackofens besteht ferner aus einer frontseitigen, umlaufenden und die Begrenzungsplatten des Einbaumöbels übergreifenden Lisene 39 aus Profilmaterial, die am untersten Lisenenquerholm 40 Kühlluft-einlassöffnungen 41 und am obersten Lisenenquerholm die schon genannten Auslassöffnungen 36 aufweist.The outer structure of the double oven also consists of a front-side, all-round and over the boundary plates of the built-in furniture Lisene 39 made of profile material, which has 40 cooling air inlet openings 41 on the lowest pilast crossbar and the already mentioned outlet openings 36 on the pilast crossbar.

Unmittelbar unterhalb des unteren Backofens 11 bzw. seiner Wärmedämmung ist zwischen den Seitenwänden 6, 7 und der Rückwand 8 eine die untere Begrenzung des Doppelbackofens bildende geschlossene Schirmplatte 9 und unmittelbar oberhalb dieses Backofens 11 eine weitere solche Schirmplatte 42, z.B. aus Stahlblech, angeordnet. Das erläuterte Aussengehäuse, also die Seiten-und Rückwände besitzen einen solchen Abstand von den Innenflächen des Einbaumöbels, dass rings um das Gehäuse Kühlkanäle 43, 44 und 45 gebildet werden, die miteinander in Verbindung stehen, aber die durch die Schirmplatten die Rück- und Seitenwände vom unteren Backofen 11 getrennt und thermisch weitgehend entkoppelt sind. Erst oberhalb der oberen Schirmplatte 42 sind in der Rückwand 8 sowie in den Seitenwänden 6, 7 Öffnungen 46 bzw. Aussparungen 47 vorhanden, die einen Zutritt der Kühlluft in den Einbauraum oder Lüftungsraum 48 für den oberen Backofen 16 gestatten. Die an den Einlassöffnungen 41 angesaugte Kühlluft tritt also in die Kühlluftkanäle 45,44,43 ein unter Umgehung des unteren Backofens 11, steigt infolge natürlicher Konvektion und infolge des Soges des Gebläses 37 nach oben, durchströmt den Lüftungsraum 48 sowie die Steuer- und Regeleinrichtungen 34 und wird von der Ansaugseite des Gebläses 37 in den Ausblaskanal 35 und von dort aus ins Freie geführt. Dabei wird durch den Zwangsstrom auf den Abluftschacht 28 eine Saugwirkung ausgeübt, welche die Abführung der aus dem Garraum des Backofens 16 stammenden Abluft begünstigt.Immediately below the lower oven 11 or its thermal insulation is between the side walls 6, 7 and the rear wall 8 form the lower boundary of the double oven de closed screen plate 9 and another such screen plate 42, for example made of sheet steel, arranged immediately above this oven 11. The outer housing explained, that is to say the side and rear walls, are spaced from the inner surfaces of the built-in furniture in such a way that cooling channels 43, 44 and 45 are formed all around the housing, which are connected to one another, but the rear and side walls through the shield plates are separated from the lower oven 11 and largely thermally decoupled. Only above the upper screen plate 42 are openings 46 or recesses 47 present in the rear wall 8 and in the side walls 6, 7, which allow the cooling air to enter the installation space or ventilation space 48 for the upper oven 16. The cooling air sucked in at the inlet openings 41 thus enters the cooling air channels 45, 44, 43 bypassing the lower oven 11, rises as a result of natural convection and as a result of the suction of the fan 37, flows through the ventilation space 48 and the control and regulating devices 34 and is guided from the suction side of the fan 37 into the blow-out duct 35 and from there into the open. In this case, the forced flow exerts a suction effect on the exhaust duct 28, which favors the removal of the exhaust air coming from the cooking space of the oven 16.

Der in den Figuren 4 bis 6 dargestellte Doppelbackofen ist in ein nicht weiter dargestelltes, z.B. aus Holzplatten gebildetes Einbaumöbel eingebaut, das aus Seitenplatten, einer Deckplatte und einer Bodenplatte bestehen kann und einen Einbauraum für den Doppelbackofen bildet. Die äussere Begrenzung des in den Einbauraum des Einbaumöbels eingesetzten Doppelbackofens wird gebildet durch ein Gehäuse 101, durch gegenüberliegende Seitenwände 102 und 103, durch eine Rückwand 104, durch einen Boden 105 sowie durch einen Deckel 106. In dieses durch die genannten Teile gebildete Gehäuse oder Rahmen eingebaut ist ein unterer Backofen 107, der eine frontseitige Klapptür mit Glasfrontplatte 109 und Handgriff 110 sowie konventionelle Heizelemente, z.B. einen Grillheizkörper sowie Ober- und Unterhitze besitzen kann, sowie darüberliegend ein oberer Backofen 11, der als Mikrowellenbackofen ausgeführt ist und ebenfalls eine Klapptür 112 mit Handgriff 113 besitzt. Zwischen dem oberen und dem unteren Backofen befindet sich ein Schirmboden 114, sowie unterhalb des unteren Backofens 102 ein unterer Schirmboden 115, welche Schirmböden 114 und 115 den Einbauraum des unteren Backofens 107 vom übrigen Gehäuseraum strömungstechnisch abschliessen. Zwischen dem unteren Schirmboden 115 und dem Gehäuseboden 105 verläuft ein horizontaler Kühlluftschacht 116, welcher in Kühlluft-Einlassöffnungen 117 einer unteren Lüftungsleiste 118 einmündet. Der obere Gehäusebereich mit oberem Backofen 111 ist als Einzelheit in Figur 6 gezeigt. Dabei ist der besseren Übersichtlichkeit halber ein oberhalb des oberen Backofens 111 an der Gehäusefrontseite plaziertes, beiden Backöfen zugeordnetes Schaltertableau 119 nach oben verschoben gezeichnet. Das eine Schaltuhr 120 sowie Bedienungselemente 121 aufweisende Schaltertableau 119 wird nach oben hin begrenzt durch eine Lüftungsleiste 122, die eine Warmluft-Auslassöffnung besitzt, die sich im Ausführungsbeispiel über zwei Drittel der Leistenlänge erstreckt und die eine Kühlluft-Einlassöffnung 124 besitzt, die sich etwa über ein Drittel der Leistenlänge erstreckt. An die Warmluft-Auslassöffnung 123 angeschlossen ist ein weitgehend geschlossener Warmluft-Ausblaskanal 125, in den an der der Lüftungsleiste gegenüberliegenden Seite die Blasseite eines Querstromgebläses 126 sowie ein mit dem Ofeninnenraum des Backofens 111 in Verbindung stehender Abluftschacht 127 einmündet. Innerhalb des durch die obere Begrenzung des Backofens 11 nach unten und durch den Gehäusedeckel 106 nach oben hin begrenzten Lüftungsraumes im obersten Gehäusebereich ist ein allgemein mit 128 bezeichneter Mikrowellengenerator mit Transformator 129 angeordnet, der im Strömungsweg eines Kühlluftschachtes 130 angeordnet ist, welcher Kühlluftschacht 130 einerseits mit der Blasseite eines besonderen Gebläses 131 verbunden ist und andererseits in den Garraum des oberen Backofens 111 einmündet. Das Gebläse 131 ist so plaziert, dass dessen Saugseite sich unmittelbar hinter der Kühlluft-Einlassöffnung 124 der Lüftungsleiste 122 befindet, so dass das Gebläse 131 unmittelbar Kühlraumluft von aussen her ansaugen kann, wie durch Pfeile verdeutlicht. Dieser Kühlluftstrom strömt durch den Kühlluftschacht 130 hindurch und kühlt dabei intensiv den Mikrowellengenerator 128. Wie ebenfalls durch Pfeile verdeutlicht, wird die warme oder heisse Abluft aus dem Ofeninnenraum über den Abluftschacht 127 in den Ausblaskanal 125 geleitet und zusammen mit der die beiden Backöfen umströmenden und in den oberen Gehäusebereich durch natürliche Konvektion sowie durch Saugwirkung (Gebläse 126) einströmenden Warmluft durch die Auslassöffnung 123 hindurch nach aussen abgegeben. In Figur 6 ist gezeigt, dass die Saugseite des Gebläses 131 aussermittig in dem Lüftungsraum in Nähe der Gehäuse-Seitenwand 102 angeordnet ist, ebenso wie nicht weiter dargestellte thermisch hochbelastete oder sehr wärmeempfindliche elektrische oder elektronische Bauteile oder Bauelemente. Die letztgenannte Seitenwand 102 besitzt im Vergleich zur gegenüberliegenden Seitenwand 103 wesentlich mehr Kühlluft-Einlassöffnungen 132, die zusätzlich zu den in beiden Seitenwänden angeordneten unteren Einlassöffnungen 133 in Nähe der obersten Begrenzung der Seitenwand 102 angeordnet sind. Auf diese Weise entsteht zwischen der Saugseite des Gebläses 131 und dessen Einlassöffnungen 132 eine gezielte Kühlluftströmung, wie in Figur 4 durch Pfeile angedeutet, welche die vorgenannten Bauteile, Schaltelemente, Transformator 129 und dergleichen umstreicht und sich weitgehend nicht mehr mit der allgemeinen Warmluftströmung vermischt. Derartige Einlassöffnungen können zusätzlich noch in der Gehäuserückwand 104 vorgesehen sein.The double oven shown in FIGS. 4 to 6 is installed in a built-in piece of furniture, not shown, for example made of wooden plates, which can consist of side plates, a cover plate and a base plate and forms an installation space for the double oven. The outer boundary of the double oven inserted into the installation space of the built-in furniture is formed by a housing 101, by opposite side walls 102 and 103, by a rear wall 104, by a base 105 and by a cover 106. In this housing or frame formed by the parts mentioned A lower oven 107 is installed, which can have a folding door on the front with glass front plate 109 and handle 110 as well as conventional heating elements, e.g. a grill radiator and top and bottom heat, as well as an upper oven 11 above, which is designed as a microwave oven and also a folding door 112 with Has handle 113. There is a screen base 114 between the upper and the lower oven, and a lower screen base 115 below the lower oven 102, which screen floors 114 and 115 fluidically seal the installation space of the lower oven 107 from the rest of the housing space. A horizontal cooling air shaft 116 runs between the lower screen base 115 and the housing base 105, which opens into cooling air inlet openings 117 of a lower ventilation strip 118. The upper housing area with the upper oven 111 is shown as a detail in FIG. 6. For the sake of clarity, a switch panel 119 placed above the upper oven 111 on the front of the housing and assigned to both ovens is shown shifted upward. The switch panel 119, which has a time switch 120 and controls 121, is limited at the top by a ventilation strip 122 which has a warm air outlet opening which in the exemplary embodiment extends over two thirds of the strip length and which has a cooling air inlet opening 124 which extends approximately over extends a third of the length of the last. Connected to the warm air outlet opening 123 is a largely closed warm air outlet duct 125, into which the blower side of a crossflow fan 126 and an exhaust duct 127 connected to the interior of the oven 111 open on the side opposite the ventilation strip. A microwave generator with transformer 129, generally designated 128, is arranged within the ventilation space in the uppermost housing area, which is delimited by the upper limit of the oven 11 at the bottom and by the housing cover 106, and which is arranged in the flow path of a cooling air shaft 130, which cooling air shaft 130 on the one hand the blow side of a special fan 131 is connected and on the other hand opens into the cooking space of the upper oven 111. The blower 131 is placed in such a way that its suction side is immediately behind the cooling air inlet opening 124 of the ventilation strip 122, so that the blower 131 can suck in cooling air directly from the outside, as indicated by arrows. This flow of cooling air flows through the cooling air shaft 130 and thereby intensively cools the microwave generator 128. As is also illustrated by arrows, the warm or hot exhaust air from the interior of the oven is conducted via the exhaust air shaft 127 into the exhaust duct 125 and together with the air flowing around and into the two ovens the upper housing area by natural convection and by suction (fan 126) warm air flowing in through the outlet opening 123 to the outside. FIG. 6 shows that the suction side of the fan 131 is arranged off-center in the ventilation space in the vicinity of the housing side wall 102, as are electrical or electronic components or components which are thermally highly stressed or are very heat-sensitive. The latter side wall 102 has significantly more cooling air inlet openings 132 compared to the opposite side wall 103, which are arranged in addition to the lower inlet openings 133 arranged in both side walls in the vicinity of the uppermost boundary of the side wall 102. In this way, between the suction side of the blower 131 and its inlet openings 132, there is a targeted cooling air flow, as indicated by arrows in FIG. 4, which circumscribes the aforementioned components, switching elements, transformer 129 and the like and is largely no longer linked to the general warm air flow mixes. Such inlet openings can additionally be provided in the rear wall 104 of the housing.

Claims (12)

1. Double baking oven, especially built-in oven with two superimposed baking ovens (11, 16) enclosed by a common housing, one of said baking ovens (16) being a micro-wave baking oven, with switching, regulating and servicing means (34) for both baking ovens (11, 16) being accomodat- ed in the upper part of the housing and cooling air ducts (43,44,45) being provided in the interior of the housing with inlet openings (41) at the lower side of the oven and outlet openings (36) at the upper side of the oven, characterized in that the lower baking oven (11) is screened thermally against the upper oven (16) and against said cooling air ducts (43, 44, 45) by means of shielding plates (9, 42) and in that said inlet openings (41) for the cooling air are provided beneath said shielding plate (9) forming the lower limit of the lower baking oven (11).
2. Double baking oven according to claim 1 further characterized in that said shielding plates (9,42) are in connection with the rear wall and the side walls (6, 7, 8) of the housing, these walls forming cooling air ducts (43, 44, 45) up to the top-end of the upper shielding plate (42).
3. Double baking oven according to claim 2 further characterized in that the cooling air ducts lead above the upper shielding plate (42) into a ventilating space (48) which is limited on one side by the upper baking oven (16) and on the other side by the housing.
4. Double baking oven according to claim 3 further characterized that in the upper portion of the ventilating space (48) there is provided a blower (37) with its suction side, whose blowout-side leads into a closed blowout duct (35), the latter leading especially to the front-side of the housing.
5. Double baking oven according to claim 4 further characterized in that an used-air duct (28) being connected with the heating chamber (17) of the upper baking oven (16) leads into the blowout duct (35).
6. Double baking oven according to one or more of the preceding claims further characterized in that the side walls and the rear wall (6, 7, 8) form a frame in the lower portion of the housing, onto which is fixed the lower baking oven (11) and which has slide rails (32) on which said microwave baking oven can be inserted as a complete unit and can be fixed by especially adjustable fixing means.
7. Double baking oven according to claim 6 further characterized that said frame is arranged in such a manner within a built-in furniture, that between the side walls and the rear wall (6, 7, 8) and the inner surfaces of the furniture or a wall of a room (5) respectively remain free cooling channels.
8. Double baking oven according to claim 6 further characterized in that a cover can be put on the frame, while on said cover the upper blowout duct (35) and the blower (37) are fixed.
9. Double baking oven according to one or more of the preceding claims, the uppermost housing portion being provided with switching and regulating means, a microwave generator (128) with its own blower and a blower (131), which is connected with ducts surrounding the ovens, further characterized in that said blower (131) is arranged with its suction side in immediate vicinity of an inlet opening (124) for cooling air in the housing (101).
10. Double baking oven according to claim 9 further characterized that on the front-side of the housing above the switching board (119) of the upper oven (111) there is provided a horizontal cooling slit (122), which is partly connected, especially with about two thirds of its length, with an essentially closed hot-air blowout duct (125) and which forms with its residual length the cooling-air inlet opening (124).
11. Double baking oven according to claim 9 and/or 10 further characterized that in the flow-passage of the cooling air between the suction-side of the blower (131) provided for the micro-wave generator (128) and the inlet cooling air openings (132, 133) especially arranged at the rear wall (104) and at the side walls (102, 103) of the housing there are placed the thermally highly exposed and heat-sensitive electrical and electronic components.
12. Double baking oven according to one or more of the preceding claims 9 to 11, further characterized in that the suction side of the blower (131) for the micro-wave generator and said thermally highly exposed and heat-sensitive components are arranged outside the center of the ventilating space being located above the upper oven (111) in the vicinity of the side wall (102) of the housing, said side wall having more cooling air inlet openings (132) than the opposite side wall (103).
EP79100334A 1978-02-14 1979-02-05 Double baking oven, particularly built-in baking oven Expired EP0003764B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2806158 1978-02-14
DE19782806158 DE2806158C2 (en) 1978-02-14 1978-02-14 Double oven
DE19782825461 DE2825461A1 (en) 1978-06-09 1978-06-09 DOUBLE OVEN, IN PARTICULAR BUILT-IN OVEN
DE2825461 1978-06-09

Publications (2)

Publication Number Publication Date
EP0003764A1 EP0003764A1 (en) 1979-09-05
EP0003764B1 true EP0003764B1 (en) 1981-10-07

Family

ID=25773826

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79100334A Expired EP0003764B1 (en) 1978-02-14 1979-02-05 Double baking oven, particularly built-in baking oven

Country Status (10)

Country Link
EP (1) EP0003764B1 (en)
AT (1) AT363408B (en)
DK (1) DK39779A (en)
ES (1) ES477478A1 (en)
FI (1) FI61348C (en)
GR (1) GR72818B (en)
HU (1) HU177957B (en)
NO (1) NO147282C (en)
PL (1) PL121237B1 (en)
YU (1) YU40735B (en)

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Publication number Priority date Publication date Assignee Title
CN108167883A (en) * 2017-12-19 2018-06-15 广东美的厨房电器制造有限公司 Heating appliance for cooking

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GB8402757D0 (en) * 1984-02-02 1984-03-07 Microwave Ovens Ltd Oven systems
IT209172Z2 (en) * 1985-11-28 1988-09-16 Zanussi Elettrodomestici BUILT-IN MICROWAVE OVEN.
KR0140461B1 (en) * 1994-07-12 1998-06-01 김광호 Microwawe oven
US20120152224A1 (en) * 2010-12-15 2012-06-21 General Electric Company Venting system for cooking appliance
CN114631547B (en) * 2022-04-19 2022-09-13 广州回味源蛋类食品有限公司 Tunnel type oven and baking method of salted egg yolk moon cake

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US2883978A (en) * 1954-05-19 1959-04-28 Preway Inc Bake and broil unit
US3150655A (en) * 1962-09-11 1964-09-29 Caloric Corp Ventilated stove
FR1466866A (en) * 1966-02-02 1967-01-20 Atlas Werke Apparatus for heating non-metallic products, especially food products, by means of microwave energy
US3430023A (en) * 1967-09-11 1969-02-25 Roper Corp Geo D Door construction and ventilating system for microwave oven
DE2615604C3 (en) * 1976-04-09 1979-02-01 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart Oven, in particular with means for pyrolytic cleaning with a cooling air fan

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108167883A (en) * 2017-12-19 2018-06-15 广东美的厨房电器制造有限公司 Heating appliance for cooking

Also Published As

Publication number Publication date
DK39779A (en) 1979-08-15
NO790244L (en) 1979-08-15
EP0003764A1 (en) 1979-09-05
FI61348B (en) 1982-03-31
NO147282C (en) 1983-03-09
ATA77279A (en) 1981-01-15
YU40735B (en) 1986-04-30
FI790399A (en) 1979-08-15
HU177957B (en) 1982-02-28
ES477478A1 (en) 1980-06-16
FI61348C (en) 1982-07-12
NO147282B (en) 1982-11-29
PL212965A1 (en) 1979-09-24
YU31879A (en) 1983-01-21
PL121237B1 (en) 1982-04-30
GR72818B (en) 1983-12-06
AT363408B (en) 1981-08-10

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