EP1464898B1 - Cooking device - Google Patents

Cooking device Download PDF

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Publication number
EP1464898B1
EP1464898B1 EP04005707A EP04005707A EP1464898B1 EP 1464898 B1 EP1464898 B1 EP 1464898B1 EP 04005707 A EP04005707 A EP 04005707A EP 04005707 A EP04005707 A EP 04005707A EP 1464898 B1 EP1464898 B1 EP 1464898B1
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EP
European Patent Office
Prior art keywords
cooking appliance
muffle
guide plate
air guide
wall
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 - Lifetime
Application number
EP04005707A
Other languages
German (de)
French (fr)
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EP1464898A1 (en
Inventor
Werner Fleischhauer
Nikolaus Haberstetter
Peter Mallinger
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1464898A1 publication Critical patent/EP1464898A1/en
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Publication of EP1464898B1 publication Critical patent/EP1464898B1/en
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Classifications

    • 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
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation

Definitions

  • the invention relates to a cooking appliance having a cooking appliance muffle delimiting a cooking chamber, a circulating air fan with a fan wheel, and an air baffle plate which forms a blower chamber between itself and a muffle wall, in which a fan wheel is arranged, and which has a mounting flange which moves the fan chamber Plant with the muffle wall is.
  • Out DE 198 31 087 A1 is a generic oven with a baking oven known.
  • An air baffle is mounted in the oven muffle parallel to a rear wall. This subdivides the oven muffle into a cooking chamber located in front of the air guide plate and a receiving space provided between the rear wall and the air guide plate for an impeller.
  • the air guide plate has suction openings and exhaust openings.
  • the air guide plate has in its upper and lower end portion over its entire width extending mounting flange. In this four fixing holes for attaching the air baffle are provided on the rear wall of the oven muffle.
  • Out DE 196 40 237 is another oven with a baking oven known in which an air baffle is arranged.
  • the air baffle has a mounting flange which lies peripherally on the rear wall of the oven muffle.
  • Another oven with a baking oven muffle is from the GB 2 054 833 A known, having an impeller in a provided behind a wall and outside the oven muffle blower chamber.
  • the wall is provided with a protection in which numerous openings are provided, so that air can flow from the oven muffle to the area of air circulation, and the inflowing air is guided to the impeller.
  • An auxiliary heater is installed within the air circulation area and adjacent to the openings to heat the circulating air.
  • an oven which comprises a box-like housing for defining a boiler room.
  • a cover is provided which is fixed to the outer surface of a side plate, and in cooperation with the one side plate with a suction ports and outlet openings in communication
  • Recording room determines. Further, in the receiving space facing the suction openings arranged blower for sucking air from the heating chamber into the receiving space via the intake ports and for blowing the air over the upper and lower outlet openings comprises. In addition, the oven has a arranged in the receiving space heating element for heating the air and a drive device for rotating the fan.
  • the object of the invention is to provide a cooking appliance with a cooking appliance muffle, in which an air baffle is sufficiently airtight system with a muffle wall.
  • an embossment is formed in the muffle wall, which is provided in the region of the fan chamber.
  • the embossing according to the invention leads to a stiffening of the muffle wall.
  • distortion of the muffle wall during heat stress of the cooking appliance muffle as occurs in particular with cooking appliance muffles with a small sheet thickness, is reduced.
  • the embossing or ring embossing formed in the muffle wall is itself in contact with the fastening flange.
  • the ring embossing not only serves to stiffen the muffle wall, but also as a sealing element formed on the muffle wall. It is particularly preferred if the embossing at least partially moves the fan chamber.
  • the fan chamber moving contact surfaces of the embossing and the mounting flange of the baffle plate is particularly narrow.
  • a line contact between the embossment and the mounting flange So that the adhesion of the enamel layer on the embossment of the muffle wall and on the air guide plate is not affected by small radii, a width of the contact surface of 1 to 2 mm is particularly preferred.
  • the muffle wall-side embossing is arranged offset with respect to a peripheral edge of the air guide plate inwardly.
  • the embossment is visible behind the air baffle.
  • damage to the muffler inside enamel layer is to be avoided in any case. It is therefore particularly advantageous if the peripheral edge of the air baffle spaced over a gap and therefore is non-contact of the muffle wall.
  • the space between the air baffle and the muffle wall also allows the peripheral edge of the air baffle to be bent toward the muffle wall. As a result, a clean-friendly and visually smooth transition between the muffle wall and the baffle plate is achieved.
  • FIG. 1 a cooking appliance with a cooking chamber 1 is shown, which is bounded by a cuboid cooking appliance muffle 3, which is coated on the inside with an enamel layer 4.
  • the cooking appliance muffle 3 comprises a vertically extending rear wall 5, two vertically and vertically extending side walls 7, a horizontally extending top wall 9 and a likewise horizontally extending bottom wall 11.
  • the cooking chamber 1 is closed in a conventional manner by the oven door 13 ,
  • Immediately below the ceiling wall 9 is an unillustrated top heat radiator arranged.
  • a not shown lower heat radiator is arranged outside the cooking chamber.
  • On the two side walls 7 corresponding guide ribs 17 are formed at different heights, can be supported on the different heights food support.
  • the air guide plate 21 has a substantially flat quadrangular trough bottom 22, from which a side edge of the tub 23 extends at an angle on the circumference. At an upper peripheral edge of the side edge of the tub 23, an approximately parallel to the tub bottom 22 extending peripheral mounting flange 25 connects.
  • the baffle limited on the one hand, the cooking chamber 1 and forms the other together with the rear wall 5, a fan chamber 27. In this case, the mounting flange 25 of the baffle plate 21 is circumferentially substantially airtight to the rear wall 5 of the cooking appliance muffle 3.
  • an impeller 29 of a radial blower is arranged, which is driven in a conventional manner by a drive unit, not shown, arranged outside the oven muffle 3.
  • the impeller 29 is surrounded by a ring heater 30, as shown in the FIG. 2 is indicated.
  • the ring heater 30 is arranged together with the impeller 29 in a recessed wall portion 31 of the rear wall 5.
  • the impeller 29 is located immediately behind suction openings 32 which are arranged in a circular area in the tub bottom 22.
  • numerous individual rectangular exhaust openings 33 are arranged one above the other and separated by narrow webs from each other, as shown in the FIG. 1 is indicated.
  • the recessed wall region 31 has a side surface parallel to the rear wall 5 and an angled transition surface between the parallel side surface and the rear wall 5.
  • the wall region 31 is surrounded by a ring embossment 35 formed in the rear wall 5.
  • the mounting flange 25 is in airtight contact with the annular embossing 35.
  • the contact surfaces of the annular embossment 35 with the mounting flange 25 here has a width of about 1 to 2 mm.
  • the annular embossing 35 causes the rear wall 5 made of a thin sheet material to warp only slightly under thermal stress. The contact surface of the ring embossing 35 thus remains in thermal contact with the
  • a peripheral edge 37 of the air guide plate 21 is spaced from the muffle back wall 5 over a gap z. This ensures that the most sharp-edged peripheral edge 37 of the air guide plate 21 is mounted without contact in any case to the muffle back wall.
  • the peripheral edge 37 of the air guide plate 21 is further set back or bent back in the direction of the muffle back wall 5, whereby a clean-friendly transition between the rear wall 5 and the baffle plate is achieved.
  • the annular embossing 35 extends like a peripheral edge of the air guide plate 21 at right angles to the fan chamber 27. At its corner regions, the narrow contact surface of the annular embossment is widened from the width b 1 to a width b 2 to form a planar mounting surface for a screw connection between the air guide plate 21 and Rear wall 5 provide.
  • FIGS. 3a to 3c Variants of the screw 43 are in the FIGS. 3a to 3c shown.
  • the enamel layers of the air baffle 21 and the muffle back wall 5 are not shown for reasons of clarity.
  • an attachment opening 45 in the annular embossment 35 is aligned with a corresponding attachment opening 47 in the attachment flange 25 of the air guide plate 21.
  • 47 hollow-cylindrical projections are deep-drawn, which protrude in opposite directions.
  • an internal thread is formed, into which a screw 49 is screwed.
  • a screw head 51 of the screw 49 presses against the edge of the hollow cylindrical projection of the air baffle 21.
  • annular projection 53 is formed on the screw head 51, which protrudes contactlessly through the fastening opening 47 of the air guide plate 21 and is in contact with the annular embossing 35 of the rear wall 5 at the end.
  • annular shoulder 53 a screwing depth of the screw 49 is limited. Consequently, the pressure exerted by the screw 49 from the mounting flange 25 of the air guide plate 21 to the rear wall pressure is limited. An excessive pressure load between the mounting flange 25 of the air guide plate and the annular embossing 35 of the rear wall 5 is prevented.
  • a plate-like spring element is provided, which is inserted on the annular shoulder 53. The spring element presses with a spring end against an end face of the screw head 51 and with another spring end against the hollow cylindrical projection of the mounting opening 45 of the air baffle 21. The spring element can absorb high thermal or mechanical loads between the air baffle 21 and the muffle back 5.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Baking, Grill, Roasting (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Cookers (AREA)

Abstract

The device has a muffle, a circulation fan with a fan wheel (29) and an air guide plate (21) forming a fan chamber (27) with a muffle wall (5) in which the fan wheel is arranged. The plate has an attachment flange (25) enclosing the fan chamber in contact with the muffle wall. An impression (35) is formed in the muffle wall in the fan chamber region.

Description

Die Erfindung betrifft ein Gargerät mit einer einen Garraum eingrenzenden Gargerätemuffel, einem Umluftgebläse mit einem Lüfterrad, und einer Luftleitplatte, die zwischen sich und einer Muffelwand eine Gebläsekammer bildet, in der ein Lüfterrad angeordnet ist, und die einen die Gebläsekammer umziehenden Befestigungsflansch aufweist, der in Anlage mit der Muffelwand ist.The invention relates to a cooking appliance having a cooking appliance muffle delimiting a cooking chamber, a circulating air fan with a fan wheel, and an air baffle plate which forms a blower chamber between itself and a muffle wall, in which a fan wheel is arranged, and which has a mounting flange which moves the fan chamber Plant with the muffle wall is.

Aus DE 198 31 087 A1 ist ein gattungsgemäßer Backofen mit einer Backofenmuffel bekannt. In der Backofenmuffel ist parallel zu einer Rückwand ein Luftleitblech gehaltert. Dieses unterteilt die Backofenmuffel in einen vor dem Luftleitblech liegenden Garraum und einen zwischen der Rückwand und dem Luftleitblech vorgesehenen Aufnahmeraum für ein Gebläserad. Das Luftleitblech weist Ansaugöffnungen und Ausblasöffnungen auf. Das Luftleitblech besitzt in seinem oberen und unteren Endabschnitt einen sich über dessen gesamte Breite erstreckenden Befestigungsflansch. In diesem sind insgesamt vier Befestigungsöffnungen zum Befestigen des Luftleitbleches an der Rückwand der Backofenmuffel vorgesehen.Out DE 198 31 087 A1 is a generic oven with a baking oven known. An air baffle is mounted in the oven muffle parallel to a rear wall. This subdivides the oven muffle into a cooking chamber located in front of the air guide plate and a receiving space provided between the rear wall and the air guide plate for an impeller. The air guide plate has suction openings and exhaust openings. The air guide plate has in its upper and lower end portion over its entire width extending mounting flange. In this four fixing holes for attaching the air baffle are provided on the rear wall of the oven muffle.

Aus DE 196 40 237 ist ein weiterer Backofen mit einer Backofenmuffel bekannt, in der eine Luftleitplatte angeordnet ist. Die Luftleitplatte weist einen Befestigungsflansch auf, der umfangsseitig an der Rückwand der Backofenmuffel liegt.Out DE 196 40 237 is another oven with a baking oven known in which an air baffle is arranged. The air baffle has a mounting flange which lies peripherally on the rear wall of the oven muffle.

Ein weiterer Backofen mit einer Backofenmuffel ist aus der GB 2 054 833 A bekannt, der ein Gebläserad in einer hinter einer Wand und außerhalb der Backofenmuffel vorgesehenen Gebläsekammer aufweist. Die Wand ist ausgestattet mit einem Schutz, in dem zahlreiche Öffnungen vorgesehen sind, so dass Luft von der Backofenmuffel zum Bereich der Luftzirkulation strömen kann, und die eingeströmte Luft zu dem Gebläserad geführt wird. Eine Zusatzheizung ist innerhalb des Luftzirkulationsbereichs und benachbart zu den Öffnungen eingebaut, um die zirkulierende Luft zu erwärmen.Another oven with a baking oven muffle is from the GB 2 054 833 A known, having an impeller in a provided behind a wall and outside the oven muffle blower chamber. The wall is provided with a protection in which numerous openings are provided, so that air can flow from the oven muffle to the area of air circulation, and the inflowing air is guided to the impeller. An auxiliary heater is installed within the air circulation area and adjacent to the openings to heat the circulating air.

Aus der EP 0 245 617 ist ein Backofen bekannt, der ein kastenartiges Gehäuse zur Festlegung eines Heizraum umfasst. Darüber hinaus ist eine Abdeckung vorgesehen, die an der Außenfläche einer Seitenplatte befestigt ist, und im Zusammenwirken mit der einen Seitenplatte einen mit Ansaugöffnungen und Auslassöffnungen in Verbindung stehendenFrom the EP 0 245 617 an oven is known which comprises a box-like housing for defining a boiler room. In addition, a cover is provided which is fixed to the outer surface of a side plate, and in cooperation with the one side plate with a suction ports and outlet openings in communication

Aufnahmeraum festlegt. Ferner ist ein im Aufnahmeraum den Ansaugöffnungen zugewandt angeordnetes Gebläse zum Ansaugen von Luft aus dem Heizraum in den Aufnahmeraum über die Ansaugöffnungen und zum Ausblasen der Luft über die oberen und unteren Auslassöffnungen umfasst. Außerdem weist der Backofen ein im Aufnahmeraum angeordnetes Heizelement zum Erwärmen der Luft und eine Antriebseinrichtung zum Drehen des Gebläses auf.Recording room determines. Further, in the receiving space facing the suction openings arranged blower for sucking air from the heating chamber into the receiving space via the intake ports and for blowing the air over the upper and lower outlet openings comprises. In addition, the oven has a arranged in the receiving space heating element for heating the air and a drive device for rotating the fan.

Die Aufgabe der Erfindung besteht darin, ein Gargerät mit einer Gargerätemuffel bereitzustellen, bei der eine Luftleitplatte in ausreichend luftdichter Anlage mit einer Muffelwand ist.The object of the invention is to provide a cooking appliance with a cooking appliance muffle, in which an air baffle is sufficiently airtight system with a muffle wall.

Die Aufgabe ist durch ein Gargerät mit den Merkmalen des Patentanspruches 1 gelöst. Gemäß dem kennzeichnenden Teil des Patentanspruches 1 ist in der Muffelwand eine Prägung ausgebildet, die im Bereich der Gebläsekammer vorgesehen ist. Die erfindungsgemäße Prägung führt zu einer Versteifung der Muffelwand. Dadurch ist ein Verziehen der Muffelwand während einer Wärmebeanspruchung der Gargerätemuffel, wie es insbesondere bei Gargerätemuffeln mit einer geringen Blechdicke auftritt, reduziert. Trotz hoher Wärmebelastung wird in der Muffelwand eine plane Kontaktfläche aufrechterhalten, die ausreichend luftdicht in Anlage mit der Luftleitplatte ist. Die in der Muffelwand ausgebildete Prägung bzw. Ringprägung ist selbst in Anlage mit dem Befestigungsflansch. In diesem Fall dient die Ringprägung nicht nur der Versteifung der Muffelwand, sondern auch als ein an der Muffelwand ausgebildetes Dichtelement. Besonders bevorzugt ist es, wenn die Prägung die Gebläsekammer zumindest teilweise umzieht.The object is achieved by a cooking appliance with the features of claim 1. According to the characterizing part of claim 1, an embossment is formed in the muffle wall, which is provided in the region of the fan chamber. The embossing according to the invention leads to a stiffening of the muffle wall. As a result, distortion of the muffle wall during heat stress of the cooking appliance muffle, as occurs in particular with cooking appliance muffles with a small sheet thickness, is reduced. Despite high heat load in the muffle wall a flat contact surface is maintained, which is sufficiently airtight in contact with the baffle plate. The embossing or ring embossing formed in the muffle wall is itself in contact with the fastening flange. In this case, the ring embossing not only serves to stiffen the muffle wall, but also as a sealing element formed on the muffle wall. It is particularly preferred if the embossing at least partially moves the fan chamber.

Hier ist es besonders bevorzugt, wenn die, die Gebläsekammer umziehenden Kontaktflächen der Prägung und des Befestigungsflansches der Luftleitplatte besonders schmal ist. Bevorzugt ist ein Linienkontakt zwischen der Prägung und dem Befestigungsflansch. Damit das Haftvermögen der Emailschicht auf der Prägung der Muffelwand sowie auf der Luftleitplatte nicht durch kleine Radien beeinträchtigt wird, ist eine Breite der Kontaktfläche von 1 bis 2 mm besonders bevorzugt.Here it is particularly preferred if the, the fan chamber moving contact surfaces of the embossing and the mounting flange of the baffle plate is particularly narrow. Preferred is a line contact between the embossment and the mounting flange. So that the adhesion of the enamel layer on the embossment of the muffle wall and on the air guide plate is not affected by small radii, a width of the contact surface of 1 to 2 mm is particularly preferred.

Aus optischen Gründen ist es von Vorteil, wenn die muffelwandseitige Prägung mit Bezug auf eine Umfangskante der Luftleitplatte nach innen versetzt angeordnet ist. In diesemFor optical reasons, it is advantageous if the muffle wall-side embossing is arranged offset with respect to a peripheral edge of the air guide plate inwardly. In this

Fall befindet sich die Prägung sichtgeschützt hinter der Luftleitplatte. Bei der Montage der Luftleitplatte an der Muffelwand ist eine Beschädigung der muffelinnenseitigen Emailschicht in jedem Falle zu vermeiden. Es ist daher besonders vorteilhaft, wenn die Umfangskante der Luftleitplatte über einen Zwischenraum beabstandet und daher berührungsfrei von der Muffelwand ist.Case, the embossment is visible behind the air baffle. When installing the baffle plate on the muffle wall damage to the muffler inside enamel layer is to be avoided in any case. It is therefore particularly advantageous if the peripheral edge of the air baffle spaced over a gap and therefore is non-contact of the muffle wall.

Der Zwischenraum zwischen der Luftleitplatte und der Muffelwand ermöglicht es darüber hinaus, dass die Umfangskante der Luftleitplatte in Richtung auf die Muffelwand umgebogen ist. Dadurch ist ein reinigungsfreundlicher und optisch glatter Übergang zwischen der Muffelwand und der Luftleitplatte erreicht.The space between the air baffle and the muffle wall also allows the peripheral edge of the air baffle to be bent toward the muffle wall. As a result, a clean-friendly and visually smooth transition between the muffle wall and the baffle plate is achieved.

Besonders bevorzugt ist es, wenn zwischen der in der Muffelrückwand ausgebildeten Prägung und dem Befestigungsflansch der Luftleitplatte eine feste Verbindung ausgebildet ist, wodurch ein besonders dichter Kontakt zwischen der Prägung und der Luftleitplatte herstellbar ist.It is particularly preferred if a firm connection is formed between the embossing formed in the muffle back wall and the fastening flange of the air guiding plate, whereby a particularly close contact between the embossing and the air guiding plate can be produced.

Ein Ausführungsbeispiel der Erfindung ist nachfolgend anhand der beigefügten Figuren beschrieben. Es zeigen:

Figur 1
in einer perspektivischen Ansicht ein Gargerät mit geöffneter Gargerätetür;
Figur 2
eine Schnittansicht in Pfeilrichtung von einer Schnittebene A aus der Figur 1;
Figuren 3a bis 3c
Varianten einer Schraubverbindung zwischen der Luftleitplatte und der Muffelwand.
An embodiment of the invention is described below with reference to the accompanying figures. Show it:
FIG. 1
in a perspective view of a cooking appliance with open cooking appliance door;
FIG. 2
a sectional view in the arrow direction from a sectional plane A of the FIG. 1 ;
FIGS. 3a to 3c
Variants of a screw connection between the air guide plate and the muffle wall.

In der Figur 1 ist ein Gargerät mit einem Garraum 1 gezeigt, der durch eine quaderförmige Gargerätemuffel 3 begrenzt ist, die innenseitig mit einer Emailleschicht 4 überzogen ist. Die Gargerätemuffel 3 umfasst eine sich vertikal erstreckende Rückwand 5, zwei sich vertikal und senkrecht dazu erstreckende Seitenwände 7, eine sich horizontal erstreckende Deckwand 9 sowie eine sich ebenso horizontal erstreckende Bodenwand 11. Der Garraum 1 ist in an sich bekannter Weise durch die Ofentür 13 verschließbar. Unmittelbar unterhalb der Deckenwand 9 ist ein nicht dargestellter Oberhitze-Heizkörper angeordnet. Unmittelbar unterhalb der Bodenwand 11 ist außerhalb des Garraums ein nicht gezeigter Unterhitze-Heizkörper angeordnet. An den beiden Seitenwänden 7 sind in unterschiedlichen Höhen entsprechende Führungsrippen 17 ausgebildet, auf die in unterschiedlichen Höhen Gargutträger gehaltert werden können.In the FIG. 1 a cooking appliance with a cooking chamber 1 is shown, which is bounded by a cuboid cooking appliance muffle 3, which is coated on the inside with an enamel layer 4. The cooking appliance muffle 3 comprises a vertically extending rear wall 5, two vertically and vertically extending side walls 7, a horizontally extending top wall 9 and a likewise horizontally extending bottom wall 11. The cooking chamber 1 is closed in a conventional manner by the oven door 13 , Immediately below the ceiling wall 9 is an unillustrated top heat radiator arranged. Immediately below the bottom wall 11 a not shown lower heat radiator is arranged outside the cooking chamber. On the two side walls 7 corresponding guide ribs 17 are formed at different heights, can be supported on the different heights food support.

An der Rückwand 5 der Gargerätemuffel 3 ist eine wannenförmig ausgebildete emaillierte Luftleitplatte 21 befestigt. Die Luftleitplatte 21 weist einen im wesentlichen flachen viereckigen Wannenboden 22 auf, von dem sich umfangsseitig abgewinkelt ein seitlicher Wannenrand 23 erstreckt. An einem oberen Umfangsrand des seitlichen Wannenrandes 23 schließt sich ein etwa parallel zum Wannenboden 22 verlaufender umfangsseitiger Befestigungsflansch 25 an. Die Luftleitplatte begrenzt zum einen den Garraum 1 und bildet zum anderen zusammen mit der Rückwand 5 eine Gebläsekammer 27. Dabei liegt der Befestigungsflansch 25 der Luftleitplatte 21 umfangsseitig im wesentlichen luftdicht an der Rückwand 5 der Gargerätemuffel 3 an. In der Gebläsekammer 27 ist ein Gebläserad 29 eines Radialgebläses angeordnet, das in an sich bekannter Weise von einer außerhalb der Backofenmuffel 3 angeordneten nicht gezeigten Antriebseinheit angetrieben wird. Das Gebläserad 29 ist von einem Ringheizkörper 30 umgeben, wie es in der Figur 2 angedeutet ist. Dabei ist der Ringheizkörper 30 zusammen mit dem Gebläserad 29 in einem rückspringenden Wandbereich 31 der Rückwand 5 angeordnet. Das Gebläserad 29 befindet sich unmittelbar hinter Ansaugöffnungen 32, die in einem kreisförmigen Bereich in dem Wannenboden 22 angeordnet sind. Über im wesentlichen die gesamte Höhe der seitlichen vertikalen Wannenränder 23 sind zahlreiche einzelne rechteckige Ausblasöffnungen 33 übereinander angeordnet und durch schmale Stege voneinander getrennt, wie es in der Figur 1 angedeutet ist.On the rear wall 5 of the Gargerätemuffel 3 a trough-shaped enameled air baffle 21 is attached. The air guide plate 21 has a substantially flat quadrangular trough bottom 22, from which a side edge of the tub 23 extends at an angle on the circumference. At an upper peripheral edge of the side edge of the tub 23, an approximately parallel to the tub bottom 22 extending peripheral mounting flange 25 connects. The baffle limited on the one hand, the cooking chamber 1 and forms the other together with the rear wall 5, a fan chamber 27. In this case, the mounting flange 25 of the baffle plate 21 is circumferentially substantially airtight to the rear wall 5 of the cooking appliance muffle 3. In the blower chamber 27, an impeller 29 of a radial blower is arranged, which is driven in a conventional manner by a drive unit, not shown, arranged outside the oven muffle 3. The impeller 29 is surrounded by a ring heater 30, as shown in the FIG. 2 is indicated. In this case, the ring heater 30 is arranged together with the impeller 29 in a recessed wall portion 31 of the rear wall 5. The impeller 29 is located immediately behind suction openings 32 which are arranged in a circular area in the tub bottom 22. About substantially the entire height of the lateral vertical tub edges 23 numerous individual rectangular exhaust openings 33 are arranged one above the other and separated by narrow webs from each other, as shown in the FIG. 1 is indicated.

Der rückspringende Wandbereich 31 weist eine zur Rückwand 5 parallele Seitenfläche sowie eine abgewinkelte Übergangsfläche zwischen der parallelen Seitenfläche und der Rückwand 5 auf. Der Wandbereich 31 ist von einer in der Rückwand 5 ausgebildeten Ringprägung 35 umzogen. Der Befestigungsflansch 25 ist dabei in luftdichter Anlage mit der Ringprägung 35. Die Kontaktflächen der Ringprägung 35 mit dem Befestigungsflansch 25 weist hier eine Breite von etwa 1 bis 2 mm auf. Die Ringprägung 35 bewirkt zum einen, dass die aus einem Dünnblechmaterial gefertigte Rückwand 5 auch bei thermischer Beanspruchung sich nur geringfügig verzieht. Die Kontaktfläche der Ringprägung 35 bleibt somit auch bei thermischer Beanspruchung in enger Anlage mit derThe recessed wall region 31 has a side surface parallel to the rear wall 5 and an angled transition surface between the parallel side surface and the rear wall 5. The wall region 31 is surrounded by a ring embossment 35 formed in the rear wall 5. The mounting flange 25 is in airtight contact with the annular embossing 35. The contact surfaces of the annular embossment 35 with the mounting flange 25 here has a width of about 1 to 2 mm. On the one hand, the annular embossing 35 causes the rear wall 5 made of a thin sheet material to warp only slightly under thermal stress. The contact surface of the ring embossing 35 thus remains in thermal contact with the

Kontaktfläche der Luftleitplatte 21. Zum anderen wird durch die Ringprägung 35 nahezu ein Linienkontakt zwischen der Luftleitplatte 21 und der Rückwand 5 geschaffen, wodurch die luftdichte Anlage dazwischen weiter verbessert ist.On the other hand, by the ring embossing 35 almost a line contact between the air guide plate 21 and the rear wall 5 is created, whereby the air-tight system between them is further improved.

Wie aus der Figur 2 hervorgeht, ist eine Umfangskante 37 der Luftleitplatte 21 von der Muffelrückwand 5 über einen Zwischenraum z beabstandet. Dadurch ist gewährleistet, dass die meist scharfkantige Umfangskante 37 der Luftleitplatte 21 in jedem Falle berührungsfrei zur Muffelrückwand montiert wird. Die Umfangskante 37 der Luftleitplatte 21 ist weiterhin in Richtung auf die Muffelrückwand 5 zurückgesetzt oder zurückgebogen, wodurch ein reinigungsfreundlicher Übergang zwischen der Rückwand 5 und der Luftleitplatte erreicht ist.Like from the FIG. 2 As can be seen, a peripheral edge 37 of the air guide plate 21 is spaced from the muffle back wall 5 over a gap z. This ensures that the most sharp-edged peripheral edge 37 of the air guide plate 21 is mounted without contact in any case to the muffle back wall. The peripheral edge 37 of the air guide plate 21 is further set back or bent back in the direction of the muffle back wall 5, whereby a clean-friendly transition between the rear wall 5 and the baffle plate is achieved.

Die Ringprägung 35 verläuft wie ein Umfangsrand der Luftleitplatte 21 rechtwinklig um die Gebläsekammer 27. An ihren Eckbereichen ist die schmale Kontaktfläche der Ringprägung von der Breite b1 auf eine Breite b2 ausgeweitet, um eine plane Montagefläche für eine Schraubverbindung zwischen der Luftleitplatte 21 und der Rückwand 5 bereitzustellen.The annular embossing 35 extends like a peripheral edge of the air guide plate 21 at right angles to the fan chamber 27. At its corner regions, the narrow contact surface of the annular embossment is widened from the width b 1 to a width b 2 to form a planar mounting surface for a screw connection between the air guide plate 21 and Rear wall 5 provide.

Varianten der Schraubverbindung 43 sind in den Figuren 3a bis 3c dargestellt. In diesen Figuren sind aus Gründen der Übersichtlichkeit die Emailschichten der Luftleitplatte 21 und der Muffelrückwand 5 nicht dargestellt. Gemäß der Figur 3a ist eine Befestigungsöffnung 45 in der Ringprägung 35 mit einer entsprechenden Befestigungsöffnung 47 in dem Befestigungsflansch 25 der Luftleitplatte 21 ausgerichtet. An beiden Befestigungsöffnungen 45, 47 sind hohlzylinderförmige Ansätze tiefgezogen, die in entgegengesetzte Richtungen ragen. In dem hohlzylinderförmigen Ansatz der Ringprägung 35 ist ein Innengewinde ausgebildet, in das eine Schraube 49 geschraubt ist. Die Schraube 49 ragt berührungsfrei durch den hohlzylinderförmigen Ansatz der Luftleitplatte 21. Ein Schraubenkopf 51 der Schraube 49 drückt gegen den Rand des hohlzylinderförmigen Ansatz der Luftleitplatte 21. Durch den kragenförmigen hohlzylinderförmigen Ansatz der Befestigungsöffnung 45 des Befestigungsflansches wird eine vom Befertigungsflansch beabstandete Berührungsfläche für den Schraubenkopf bereitgestellt. Dadurch entsteht keinerlei flächiger Druckkontakt zwischen einer Stirnseite des Schraubenkopfes 51 und der Emailschicht auf der Luftleitplatte 21.Variants of the screw 43 are in the FIGS. 3a to 3c shown. In these figures, the enamel layers of the air baffle 21 and the muffle back wall 5 are not shown for reasons of clarity. According to the FIG. 3a an attachment opening 45 in the annular embossment 35 is aligned with a corresponding attachment opening 47 in the attachment flange 25 of the air guide plate 21. At both mounting holes 45, 47 hollow-cylindrical projections are deep-drawn, which protrude in opposite directions. In the hollow cylindrical projection of the ring embossment 35, an internal thread is formed, into which a screw 49 is screwed. A screw head 51 of the screw 49 presses against the edge of the hollow cylindrical projection of the air baffle 21. The collar-shaped hollow cylindrical projection of the mounting opening 45 of the mounting flange a spaced from the Befertigungsflansch contact surface for the screw head is provided , As a result, no two-dimensional pressure contact between an end face of the screw head 51 and the enamel layer on the air guide plate 21.

Gemäß der Befestigungsvariante aus der Figur 3b ist am Schraubenkopf 51 ein zusätzlicher Ringansatz 53 ausgebildet, der berührungsfrei durch die Befestigungsöffnung 47 der Luftleitplatte 21 ragt und stimseitig in Anlage mit der Ringprägung 35 der Rückwand 5 ist. Durch den Ringansatz 53 ist eine Einschraubtiefe der Schraube 49 begrenzt. Folglich ist auch der mittels der Schraube 49 von dem Befestigungsflansch 25 der Luftleitplatte 21 auf die Rückwand ausgeübte Druck begrenzt. Eine übermäßige Druckbelastung zwischen dem Befestigungsflansch 25 der Luftleitplatte und der Ringprägung 35 der Rückwand 5 ist dadurch verhindert. Gemäß der Befestigungsvariante aus der Figur 3c ist zusätzlich ein tellerartiges Federelement vorgesehen, das auf den Ringansatz 53 gesteckt ist. Das Federelement drückt mit einem Federende gegen eine Stirnseite des Schraubenkopfes 51 und mit einem weiteren Federende gegen den hohlzylinderförmigen Ansatz der Befestigungsöffnung 45 der Luftleitplatte 21. Das Federelement kann hohe thermische oder mechanische Belastungen zwischen der Luftleitplatte 21 und der Muffelrückwand 5 aufnehmen.According to the mounting variant of the FIG. 3b An additional annular projection 53 is formed on the screw head 51, which protrudes contactlessly through the fastening opening 47 of the air guide plate 21 and is in contact with the annular embossing 35 of the rear wall 5 at the end. Through the annular shoulder 53 a screwing depth of the screw 49 is limited. Consequently, the pressure exerted by the screw 49 from the mounting flange 25 of the air guide plate 21 to the rear wall pressure is limited. An excessive pressure load between the mounting flange 25 of the air guide plate and the annular embossing 35 of the rear wall 5 is prevented. According to the mounting variant of the Figure 3c In addition, a plate-like spring element is provided, which is inserted on the annular shoulder 53. The spring element presses with a spring end against an end face of the screw head 51 and with another spring end against the hollow cylindrical projection of the mounting opening 45 of the air baffle 21. The spring element can absorb high thermal or mechanical loads between the air baffle 21 and the muffle back 5.

Claims (10)

  1. Cooking appliance with a cooking appliance muffle (3), a circulating fan with a fan wheel (29) and an air guide plate (21), which forms, between itself and a muffle wall (5), a fan chamber (27) in which the fan wheel (29) is arranged, which air guide plate (21) has a fastening flange (25) which encircles the fan chamber (27) and is contact with the muffle wall (5), and in which muffle wall (5) a stamping (35), which is provided in the region of the fan chamber (27), is formed, characterised in that the fastening flange (25) is in contact with the stamping (35).
  2. Cooking appliance according to claim 1, characterised in that the stamping (35) at least partly surrounds the fan chamber (27).
  3. Cooking appliance according to claim 1 or 2, characterised in that the stamping (35) formed in the muffle wall (5) is in contact with the fastening flange (25) of the air guide plate by a narrow contact surface, which is, in particular, approximately 1 to 2 millimetres wide.
  4. Cooking appliance according to any one of the preceding claims, characterised in that the stamping (35) is in a lineal contact with the fastening flange (25) of the air guide plate (21).
  5. Cooking appliance according to any one of the preceding claims, characterised in that the stamping (35) is arranged to be offset inwardly with respect to a circumferential edge (27) of the air guide plate (21).
  6. Cooking appliance according to claim 5, characterised in that the circumferential edge (37) of the air guide plate (21) and the muffle wall (5) are spaced by way of an intermediate space (z).
  7. Cooking appliance according to claim 5 or 6, characterised in that the circumferential edge (37) of the air guide plate (21) is bent over in direction towards the muffle wall (5).
  8. Cooking appliance according to any one of the preceding claims, characterised in that the stamping (35) formed in the muffle wall (5) is in fixed connection with the fastening flange (25) of the air guide plate (21).
  9. Cooking appliance according to any one of the preceding claims, characterised in that the fastening flange is fastened to the muffle wall by way of a screw connection (51).
  10. Cooking appliance according to claim 9, characterised in that a screw opening (45) of the fastening flange (25) is formed to be collar-shaped.
EP04005707A 2003-03-31 2004-03-10 Cooking device Expired - Lifetime EP1464898B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10314571A DE10314571A1 (en) 2003-03-31 2003-03-31 Cooking appliance
DE10314571 2003-03-31

Publications (2)

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EP1464898A1 EP1464898A1 (en) 2004-10-06
EP1464898B1 true EP1464898B1 (en) 2009-01-07

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EP04005707A Expired - Lifetime EP1464898B1 (en) 2003-03-31 2004-03-10 Cooking device

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EP (1) EP1464898B1 (en)
AT (1) ATE420324T1 (en)
DE (2) DE10314571A1 (en)
ES (1) ES2319284T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4062109A4 (en) * 2020-01-29 2023-08-02 Femas Metal San. Ve Tic. A.S. Domestic oven comprising a rear wall cover on muffle

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
DE102007061285A1 (en) * 2007-12-19 2009-06-25 BSH Bosch und Siemens Hausgeräte GmbH Hot air or convection oven
EP2372256B1 (en) * 2010-03-31 2016-09-07 Electrolux Home Products Corporation N.V. Oven muffle and oven comprising such muffle
DE102012223677A1 (en) * 2012-12-19 2014-06-26 BSH Bosch und Siemens Hausgeräte GmbH Illuminated cooking appliance
US20220034516A1 (en) * 2020-07-29 2022-02-03 Electrolux Home Products, Inc. Oven cavity wrapper having a structural embossment and associated convection features

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Publication number Priority date Publication date Assignee Title
DE2557867C3 (en) * 1975-12-22 1979-11-08 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart Convection oven
JPS5950890B2 (en) * 1979-06-25 1984-12-11 株式会社東芝 heating device
DE2950946C2 (en) * 1979-12-18 1984-08-09 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Oven with fan and grill element
DE3506760A1 (en) * 1985-02-26 1986-09-04 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Baking and roasting oven
US4780596A (en) * 1986-05-15 1988-10-25 Kabushiki Kaisha Toshiba Hot-air circulation cooking oven
DE4105300C2 (en) * 1991-02-20 1997-02-13 Bosch Siemens Hausgeraete Fan for a convection oven
DE19640237A1 (en) * 1996-09-30 1998-04-02 Bosch Siemens Hausgeraete Oven with fan
DE19831087A1 (en) * 1998-07-10 2000-01-13 Bsh Bosch Siemens Hausgeraete Oven with blower assisted circulation promoting more uniform heating and browning even at lower air flow rates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4062109A4 (en) * 2020-01-29 2023-08-02 Femas Metal San. Ve Tic. A.S. Domestic oven comprising a rear wall cover on muffle

Also Published As

Publication number Publication date
EP1464898A1 (en) 2004-10-06
ATE420324T1 (en) 2009-01-15
DE502004008806D1 (en) 2009-02-26
DE10314571A1 (en) 2004-10-14
ES2319284T3 (en) 2009-05-06

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