EP1064502A1 - Baking oven with a baking oven muffle - Google Patents

Baking oven with a baking oven muffle

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Publication number
EP1064502A1
EP1064502A1 EP99917868A EP99917868A EP1064502A1 EP 1064502 A1 EP1064502 A1 EP 1064502A1 EP 99917868 A EP99917868 A EP 99917868A EP 99917868 A EP99917868 A EP 99917868A EP 1064502 A1 EP1064502 A1 EP 1064502A1
Authority
EP
European Patent Office
Prior art keywords
muffle
oven
protective layer
layer
sol
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99917868A
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German (de)
French (fr)
Other versions
EP1064502B1 (en
Inventor
Gerhard Schmidmayer
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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Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Priority to EP02017745A priority Critical patent/EP1255083B1/en
Publication of EP1064502A1 publication Critical patent/EP1064502A1/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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/06—Arrangement or mounting of electric heating elements
    • 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
    • F24C15/005—Coatings for ovens

Definitions

  • the present invention relates to an oven with a metallic oven muffle that can be closed at the front by a door, the muffle walls of which are associated with heating elements for heating the cooking space to above about 180 ° C. or the items to be cooked therein, with a protective layer covering the muffle walls at least on the inside .
  • Such an oven is generally known, the oven muffle being provided with an enamel layer.
  • the enamel coating serves on the one hand as an anti-corrosion layer and on the other hand as an anti-oxidation layer. Furthermore, the enamel layer improves the cleanability of the oven muffle and increases the surface hardness. Finally, the look of the oven muffle is determined by the enamel.
  • the object of the present invention is therefore to improve the performance properties of the oven muffle in an oven according to the preamble of claim 1.
  • the thickness of the protective layer is less than about 30 microns, in particular less than 20 microns and preferably between about 5 and 10 microns.
  • the thickness of the protective layer is less than about 30 microns, in particular less than 20 microns and preferably between about 5 and 10 microns.
  • the sol-gel layer can, for example, be applied to the muffle walls in a simple immersion process.
  • the low baking temperatures of about 450 to 500 ° C. are favorable in the sol-gel technique compared to the enamel technique.
  • the applied sol-gel layers are also suitable for the temperatures typical for cooking processes.
  • the hard layer preferably has a thickness of 5 to 10 ⁇ m.
  • a sol-gel functional layer is provided on the hard sol-gel layer.
  • Different areas of the muffle walls can be equipped with special properties. These properties can be, for example, a particularly simple cleanability, a special sliding behavior or catalytic properties.
  • the functional layer is advantageously implemented as a layer approximately 10 ⁇ m, in particular approximately 2 to 3 ⁇ m thick. Due to the sol-gel technology, the applied layers, despite their small thickness, have great stability and great adhesion both on top of one another and on the metal.
  • the protective layer is transparent and the inside of the muffle wall serves as a reflector. This is particularly advantageous when cooking with the help of heat radiation in the infrared range or in the visible light range.
  • Such transparent layers can be easily represented as sol-gel layers.
  • the protective layer can be realized as an anodized, in particular hard anodized, aluminum oxide layer.
  • This oxide layer is particularly characterized by its excellent hardness and smoothness.
  • a particularly good heat transfer from the heating element to the muffle wall or to the cooking space and an excellent heat distribution in this respect can be achieved in that the muffle wall has an insulating protective layer in the ⁇ m range to which the heating element is applied directly by means of thick-film technology.
  • the heating element can also be implemented using more complex coating processes, for example thin-film technology. Due to the thin protective layers, only slight stresses occur in the oven muffle when the oven muffle is heated up, despite the different thermal expansion coefficients of the protective layer and the muffle wall. The thickness of the muffle wall can therefore also be reduced to, for example, approximately 0.4 mm.
  • the oven muffle is supported from the outside by a stabilizing frame. This is particularly important if the thickness of the muffle wall is only about 0.3 to 0.5 mm. This almost halving the wall thickness of the oven muffle compared to the previously known prior art further improves the heating-up times and the heat distribution. In addition, material can be saved due to the low material thickness. In addition, the weight of the oven muffle is significantly reduced.
  • the stabilizing frame is essentially formed by oven insulation. On the one hand, this must be sufficiently flexible to be able to participate in the spatial enlargement of the oven muffle when heating up, and on the other hand it must be stiff enough to be able to sufficiently stabilize the thin-walled oven muffle.
  • Fig. 4 in perspective views from the front of the oven muffle after various process steps for its manufacture.
  • Fig. 1 shows a rectangular oven muffle 1 made of stainless steel with five muffle walls 3. These are the two side walls, a bottom and a top wall and a rear wall.
  • the loading opening of the oven muffle 1 moves around a muffle flange 5.
  • the oven muffle 1 is produced in one piece using a hydroforming process. In this deep-drawing process, in contrast to conventional mechanically deep-drawn parts, the oven muffle does not have defects such as uneven and large changes in wall thickness, visible traces of drawing and a bead, as well as reduced surface quality and reduced shape accuracy.
  • sol-gel technology a muffle inside 7 and a muffle outside 9 are coated with a sol-gel layer 11 in a dipping or spraying process (FIG. 2).
  • a solution becomes a colloid by controlled condensation methods System created on the micrometer scale (gel).
  • This gel is compressed by drying as a result of solvent removal and then cured in a suitable manner or baked at a temperature of about 450 to 500 ° C.
  • the sol-gel layer is particularly firmly bonded to the substrate via chemical compounds.
  • the resulting sol-gel layer is about 10 ⁇ m thick and forms a hard surface with electrical insulation properties on both sides of the stainless steel muffle wall 3. Furthermore, it forms a tarnish and oxidation protection for the stainless steel.
  • functional layers are applied to the sol-gel hard layer on different areas of the inside of the socket 7.
  • the sol-gel functional layers in particular provide non-stick, sliding and catalytic properties.
  • the sol-gel functional layers have a thickness of approximately 3 ⁇ m.
  • the protective layer formed from the two sol-gel layers 11 is so transparent that the heat radiation relevant to the preparation of food can penetrate the protective layer in the infrared or visible light range and can be optimally reflected by the stainless steel surface into the interior of the muffle (Fig . 2). If necessary, a transparent or opaque coloring of the layers is also possible.
  • heating conductors 13 are applied to the sol-gel hard layer on the muffle outside using thick-film technology (FIG. 3). Due to the particularly thin insulation layer between the heating conductor 13 and the muffle wall 3, a particularly favorable and uniform heat transfer is possible.
  • the heating conductors 13 can be supplied with electrical voltage via conductor connections 15.
  • the oven muffle 1 is finally in a muffle insulation 17 made of fiber-free insulation material, e.g. Perlite, embedded.
  • the oven jacket 1 the wall thickness of which is only 0.4 mm, is stabilized by the insulation jacket.
  • the insulation shell 17 is designed to be sufficiently flexible so that it does not tear during the thermal expansion of the oven muffle 1 during heating during a baking process.

Abstract

The oven has a metal muffle which is closed at the front by a door. The walls of the muffle have heating elements for heating the cooking space to over 180 degrees C. The walls of the muffle are covered at least on the inside by a protective layer. The protective layer is less than 30 micrometer thick, and made of sol-gel resin.

Description

Backofen mit Backofenmuffel Oven with muffle
Die vorliegende Erfindung betrifft einen Backofen mit einer frontseitig durch eine Tür ver- schließbaren metallischen Backofenmuffel, deren Muffelwände Heizelemente zum Beheizen des Garraumes auf über etwa 180 °C bzw. des darin angeordneten Gargutes zugeordnet sind, mit einer die Muffelwände zumindest an der Innenseite bedeckenden Schutzschicht.The present invention relates to an oven with a metallic oven muffle that can be closed at the front by a door, the muffle walls of which are associated with heating elements for heating the cooking space to above about 180 ° C. or the items to be cooked therein, with a protective layer covering the muffle walls at least on the inside .
Ein derartiger Backofen ist allgemein bekannt, wobei die Backofenmuffel mit einer Emailschicht versehen ist. Die Emailbeschichtung dient zum einen als Antikorrosionsschicht und zum anderen als Antioxidationsschicht. Weiterhin wird durch die Emailschicht die Reinigbarkeit der Backofenmuffel verbessert und die Oberflächenhärte vergrößert. Zuletzt wird durch das Email die Optik der Backofenmuffel bestimmt. Diese Funktionen werden durch das Email bei Schichtstärken von typisch 100 bis 200 μm realisiert. Nachteilig an derartigen Schutzschichten aus Email sind insbesondere deren Sprödigkeit und die durch die unterschiedlichen Ausdehnungskoeffizienten von Email und Muffelmaterial entstehenden Zug- und Druckspannungen, die zu Bauteilverformungen, Rissen oder Abplatzern des Emails führen können.Such an oven is generally known, the oven muffle being provided with an enamel layer. The enamel coating serves on the one hand as an anti-corrosion layer and on the other hand as an anti-oxidation layer. Furthermore, the enamel layer improves the cleanability of the oven muffle and increases the surface hardness. Finally, the look of the oven muffle is determined by the enamel. These functions are realized by the email with layer thicknesses of typically 100 to 200 μm. Disadvantages of such protective layers made of enamel are, in particular, their brittleness and the tensile and compressive stresses which arise from the different expansion coefficients of enamel and muffle material, which can lead to component deformation, cracks or flaking of the enamel.
Aufgabe der vorliegenden Erfindung ist es deshalb, bei einem Backofen nach dem Oberbegriff des Patentanspruches 1 die Gebrauchseigenschaften der Backofenmuffel zu verbessern.The object of the present invention is therefore to improve the performance properties of the oven muffle in an oven according to the preamble of claim 1.
Erfindungsgemäß ist dies bei einem Backofen nach dem Oberbegriff des Patentanspruches 1 dadurch erreicht, daß die Stärke der Schutzschicht geringer als etwa 30 μm, insbesondere geringer als 20 μm und bevorzugter Weise zwischen etwa 5 und 10 μm ist. Infolge der geringen Schichtstärke treten in der Muffelwand nur geringe Spannungen auf. Weiterhin ist eine sehr gute Wärmeleitung von den Heizelementen bzw. der Muffelwand zum Muffelinneren sichergestellt und ist eine geringe Rißanfälligkeit der Schutzschicht bzw. eine geringe Wahrscheinlichkeit von Abplatzern realisiert. Diese dünne Schutzschicht stellt einen ausreichenden Korrosions- und Oxidationsschutz sowie einen harten Oberflächenschutz für das Metall dar. Derartig dünne Schutzschichten können verfahrenstechnisch einfach bevorzugterweise in Sol-Gel-Technik realisiert sein. Dabei ist die Sol-Gel-Schicht beispielsweise in einem einfachen Tauchverfahren auf die Muffelwände aufbringbar. Insbesondere sind bei der Sol- Gel-Technik die im Vergleich zur Emailierungstechnik niedrigen Einbrenntemperaturen von etwa 450 bis 500 °C günstig. Auch sind die aufgebrachten Sol-Gel-Schichten für die bei Garvorgängen typischen Temperaturen geeignet. Bevorzugter Weise besitzt die Hartschicht eine Stärke von 5 bis 10 μm.According to the invention this is achieved in an oven according to the preamble of claim 1 in that the thickness of the protective layer is less than about 30 microns, in particular less than 20 microns and preferably between about 5 and 10 microns. As a result of the low layer thickness, only slight stresses occur in the muffle wall. Furthermore, very good heat conduction from the heating elements or the muffle wall to the interior of the muffle is ensured and a low susceptibility to cracking of the protective layer or a low probability of chipping is realized. This thin protective layer provides adequate protection against corrosion and oxidation as well as a hard surface protection for the metal. Such thin protective layers can be implemented in a simple process, preferably using sol-gel technology. The sol-gel layer can, for example, be applied to the muffle walls in a simple immersion process. In particular, the low baking temperatures of about 450 to 500 ° C. are favorable in the sol-gel technique compared to the enamel technique. The applied sol-gel layers are also suitable for the temperatures typical for cooking processes. The hard layer preferably has a thickness of 5 to 10 μm.
Um die Gebrauchseigenschaften der Backofenmuffel weiter zu verbessern, ist auf der Sol-Gel-Hartschicht eine Sol-Gel-Funktionalschicht vorgesehen. Dadurch können verschiedene Bereiche der Muffelwände mit besonderen Eigenschaften ausgestattet werden. Diese Eigenschaften können beispielsweise sein, eine besonders einfache Reinigbarkeit, ein besonderes Gleitverhalten oder katalytische Eigenschaften. Vorteilhafterweise ist die Funktionalschicht als etwa 10 μm, insbesondere etwa 2 bis 3 μm starke Schicht realisiert. Aufgrund der Sol-Gel-Technik verfügen die aufgebrachten Schichten trotz ihrer geringen Dicke sowohl aufeinander als auch auf dem Metall über eine große Stabilität und ein großes Anhaftvermögen.In order to further improve the usage properties of the oven muffle, a sol-gel functional layer is provided on the hard sol-gel layer. Different areas of the muffle walls can be equipped with special properties. These properties can be, for example, a particularly simple cleanability, a special sliding behavior or catalytic properties. The functional layer is advantageously implemented as a layer approximately 10 μm, in particular approximately 2 to 3 μm thick. Due to the sol-gel technology, the applied layers, despite their small thickness, have great stability and great adhesion both on top of one another and on the metal.
Gemäß einer bevorzugten Ausführungsform ist die Schutzschicht transparent und dient die Innenseite der Muffelwand als Reflektor. Dies ist insbesondere dann günstig, wenn mit Hilfe von Wärmestrahlung im Infrarotbereich oder im sichtbaren Licht-Bereich gegart wird. Derartige Transparentschichten sind als Sol-Gel-Schichten problemlos darstellbar.According to a preferred embodiment, the protective layer is transparent and the inside of the muffle wall serves as a reflector. This is particularly advantageous when cooking with the help of heat radiation in the infrared range or in the visible light range. Such transparent layers can be easily represented as sol-gel layers.
Falls die Backofenmuffel aus Aluminium besteht, kann die Schutzschicht als anodisierte, insbesondere hartanodisierte Aluminiumoxidschicht realisiert sein. Diese Oxidschicht zeichnet sich insbesondere durch ihre ausgezeichnete Härte und Glätte aus.If the oven muffle is made of aluminum, the protective layer can be realized as an anodized, in particular hard anodized, aluminum oxide layer. This oxide layer is particularly characterized by its excellent hardness and smoothness.
Ein besonders guter Wärmeübergang vom Heizelement zur Muffelwand bzw. zum Gar- räum und eine diesbezüglich hervorragende Wärmeverteilung ist dadurch erreichbar, daß die Muffelwand eine isolierende Schutzschicht im μm-Bereich aufweist, auf der das Heizelement mittels Dickschichttechnik direkt aufgebracht ist. Gegebenenfalls kann das Heizelement auch mit aufwendigeren Beschichtungsverfahren, beispielsweise der Dünnschichttechnik, realisiert sein. Aufgrund der dünnen Schutzschichten treten beim Aufheizen der Backofenmuffel trotz der unterschiedlichen Wärmeausdehnungskoeffizienten der Schutzschicht und der Muffelwand lediglich geringe Spannungen in der Backofenmuffel auf. Deshalb kann die Stärke der Muffelwand auch auf beispielsweise etwa 0,4 mm verringert werden.A particularly good heat transfer from the heating element to the muffle wall or to the cooking space and an excellent heat distribution in this respect can be achieved in that the muffle wall has an insulating protective layer in the μm range to which the heating element is applied directly by means of thick-film technology. If necessary, the heating element can also be implemented using more complex coating processes, for example thin-film technology. Due to the thin protective layers, only slight stresses occur in the oven muffle when the oven muffle is heated up, despite the different thermal expansion coefficients of the protective layer and the muffle wall. The thickness of the muffle wall can therefore also be reduced to, for example, approximately 0.4 mm.
Gemäß einer bevorzugten Ausführungsform ist die Backofenmuffel durch einen Stabilisierungsrahmen von außen abgestützt. Dies ist insbesondere dann wichtig, wenn die Dicke der Muffelwand nur etwa 0,3 bis 0,5 mm beträgt. Durch diese nahezu Halbierung der Wandstärke der Backofenmuffel im Vergleich zum bisher bekannten Stand der Technik werden die Aufheizzeiten und die Wärmeverteilung weiterhin deutlich verbessert. Zudem kann durch die geringe Materialstärke Material eingespart werden. Außerdem wird das Gewicht der Backofenmuffel deutlich reduziert.According to a preferred embodiment, the oven muffle is supported from the outside by a stabilizing frame. This is particularly important if the thickness of the muffle wall is only about 0.3 to 0.5 mm. This almost halving the wall thickness of the oven muffle compared to the previously known prior art further improves the heating-up times and the heat distribution. In addition, material can be saved due to the low material thickness. In addition, the weight of the oven muffle is significantly reduced.
Gemäß einer bevorzugten Ausführungsform ist der Stabilisierungsrahmen im wesentli- chen durch eine Backofenisolation gebildet. Diese muß zum einen ausreichend nachgiebig sein, um die räumliche Vergrößerung der Backofenmuffel beim Aufheizen mitmachen zu können, und zum anderen steif genug sein, um die dünnwandige Backofenmuffel ausreichend stabilisieren zu können.According to a preferred embodiment, the stabilizing frame is essentially formed by oven insulation. On the one hand, this must be sufficiently flexible to be able to participate in the spatial enlargement of the oven muffle when heating up, and on the other hand it must be stiff enough to be able to sufficiently stabilize the thin-walled oven muffle.
Es zeigen:Show it:
Fig. 1 bis1 to
Fig. 4 in perspektivischen Ansichten von vorne die Backofenmuffel nach verschiedenen Verfahrensschritten zu deren Herstellung.Fig. 4 in perspective views from the front of the oven muffle after various process steps for its manufacture.
Fig. 1 zeigt eine quaderförmige Backofenmuffel 1 aus Edelstahl mit fünf Muffelwänden 3. Dies sind die beiden Seitenwände, eine Boden- und eine Deckwand sowie eine Rückwand. Die Beschickungsöffnung der Backofenmuffel 1 umzieht ein Muffelflansch 5. Die Backofenmuffel 1 ist einstückig in einem Hydrournformverfahren hergestellt. Bei diesem Tiefziehverfahren weist die Backofenmuffel im Unterschied zu herkömmlichen mechanisch tiefgezogenen Teilen Mängel, wie ungleichmäßige und große Wanddickenveränderungen, sichtbare Ziehspuren und einen Ziehwulst, sowie verminderte Oberflächenqualität und verminderte Formgenauigkeit nicht auf. Mit Hilfe der Sol-Gel- Technologie werden in einem Tauch- oder Spritzverfahren eine Muffelinnenseite 7 und eine Muffelaußenseite 9 mit einer Sol-Gel-Schicht 11 beschichtet (Fig. 2). Dabei wird aus einer Lösung (Sol) durch kontrollierte Kondensationsmethoden ein kolloides System im Mikrometer-Maßstab (Gel) erzeugt. Dieses Gel wird durch Trocknen infolge Lösungsmittelentzug verdichtet und anschließend in geeigneter Weise ausgehärtet bzw. bei einer Temperatur von etwa 450 bis 500CC eingebrannt. Während dieses Prozesses wird die Sol-Gel-Schicht über chemische Verbindungen mit dem Untergrund besonders fest verbunden. Die dabei entstehende Sol-Gel-Schicht ist etwa 10 μm dick und bildet auf der Muffelwand 3 aus Edelstahl beidseitig eine harte Oberfläche mit elektrischen Isolationseigenschaften. Weiterhin bildet sie einen Anlauf- und Oxida- tionsschutz für das Edelstahl. Auf die Sol-Gel-Hartschicht sind in zumindest einem weiteren Prozeßschritt in Sol-Gel-Technik Funktionalschichten auf verschiedene Bereiche der Muffeiinnenseite 7 aufgebracht. Abhängig vom Ort in der Backofenmuffel 1 sind durch die Sol-Gel-Funktionalschichten insbesondere Antihaft-, Gleit- und Katalyseeigenschaften bereitgestellt. Die Sol-Gel-Funktionalschichten haben dabei eine Dicke von etwa 3 μm. Die aus den beiden Sol-Gel-Schichten 11 gebildete Schutzschicht ist derart transparent, daß die zur Zubereitung von Speisen relevante Wärmestrahlung im Infrarot- bzw. im sichtbaren Licht-Bereich die Schutzschicht durchdringen kann und von der Edelstahloberfläche ins Muffelinnere optimal reflektiert werden kann (Fig. 2). Bei Bedarf ist auch eine transparente oder deckende Einfärbung der Schichten möglich.Fig. 1 shows a rectangular oven muffle 1 made of stainless steel with five muffle walls 3. These are the two side walls, a bottom and a top wall and a rear wall. The loading opening of the oven muffle 1 moves around a muffle flange 5. The oven muffle 1 is produced in one piece using a hydroforming process. In this deep-drawing process, in contrast to conventional mechanically deep-drawn parts, the oven muffle does not have defects such as uneven and large changes in wall thickness, visible traces of drawing and a bead, as well as reduced surface quality and reduced shape accuracy. With the help of sol-gel technology, a muffle inside 7 and a muffle outside 9 are coated with a sol-gel layer 11 in a dipping or spraying process (FIG. 2). Thereby, a solution (sol) becomes a colloid by controlled condensation methods System created on the micrometer scale (gel). This gel is compressed by drying as a result of solvent removal and then cured in a suitable manner or baked at a temperature of about 450 to 500 ° C. During this process, the sol-gel layer is particularly firmly bonded to the substrate via chemical compounds. The resulting sol-gel layer is about 10 μm thick and forms a hard surface with electrical insulation properties on both sides of the stainless steel muffle wall 3. Furthermore, it forms a tarnish and oxidation protection for the stainless steel. In at least one further process step using the sol-gel technique, functional layers are applied to the sol-gel hard layer on different areas of the inside of the socket 7. Depending on the location in the oven muffle 1, the sol-gel functional layers in particular provide non-stick, sliding and catalytic properties. The sol-gel functional layers have a thickness of approximately 3 μm. The protective layer formed from the two sol-gel layers 11 is so transparent that the heat radiation relevant to the preparation of food can penetrate the protective layer in the infrared or visible light range and can be optimally reflected by the stainless steel surface into the interior of the muffle (Fig . 2). If necessary, a transparent or opaque coloring of the layers is also possible.
Auf die Sol-Gel-Hartschicht sind in einem nachfolgenden Verfahrensschritt auf der Muffelaußenseite 9 mäanderförmige Heizleiter 13 in Dickschichttechnik aufgetragen (Fig. 3). Aufgrund der besonders dünnen Isolationsschicht zwischen dem Heizleiter 13 und der Muffelwand 3 ist ein besonders günstiger und gleichmäßiger Wärmeübergang möglich. Die Heizleiter 13 können über Leiteranschlüsse 15 mit elektrischer Spannung versorgt werden.In a subsequent process step, 9 meandering heating conductors 13 are applied to the sol-gel hard layer on the muffle outside using thick-film technology (FIG. 3). Due to the particularly thin insulation layer between the heating conductor 13 and the muffle wall 3, a particularly favorable and uniform heat transfer is possible. The heating conductors 13 can be supplied with electrical voltage via conductor connections 15.
Gemäß Fig. 4 ist die Backofenmuffel 1 schließlich in eine Muffelisolation 17 aus faserfreiem Isolationsmaterial, z.B. Perlite, eingebettet. Durch den Isolationsmantel ist die Backofenmuffel 1 , deren Wandstärke lediglich 0,4 mm beträgt, stabilisiert. Weiterhin ist die Isolationsschale 17 ausreichend nachgiebig gestaltet, um bei der thermischen Ausdehnung der Backofenmuffel 1 beim Aufheizen während eines Backvorgangs nicht zu reißen. 4, the oven muffle 1 is finally in a muffle insulation 17 made of fiber-free insulation material, e.g. Perlite, embedded. The oven jacket 1, the wall thickness of which is only 0.4 mm, is stabilized by the insulation jacket. Furthermore, the insulation shell 17 is designed to be sufficiently flexible so that it does not tear during the thermal expansion of the oven muffle 1 during heating during a baking process.

Claims

Patentansprüche claims
1. Backofen mit einer frontseitig durch eine Tür verschließbaren metallischen1. Oven with a metallic lockable on the front by a door
Backofenmuffel, deren Muffelwände Heizelemente zum Beheizen des Gar- raumes auf über etwa 180 °C bzw. des darin angeordneten Gargutes zugeordnet sind, mit einer die Muffelwände zumindest an der Innenseite bedek- kenden Schutzschicht, d a d u r c h g e k e n n z e i c h n e t , daß die Stärke der Schutzschicht (11) geringer als etwa 30 um ist.Oven muffle, the muffle walls of which are assigned heating elements for heating the cooking space to above about 180 ° C. or the items to be cooked therein, with a protective layer covering the muffle walls at least on the inside, characterized in that the thickness of the protective layer (11) is lower than about 30 µm.
2. Backofen nach Anspruch 1 , dadurch gekennzeichnet, daß die Schutzschicht als Sol-Gel-Hartschicht (11) realisiert ist.2. Oven according to claim 1, characterized in that the protective layer is realized as a hard sol-gel layer (11).
3. Backofen nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß auf der Sol-Gel-Hartschicht eine Sol-Gel-Funktionalschicht vorgesehen ist.3. Oven according to claim 1 or 2, characterized in that a sol-gel functional layer is provided on the sol-gel hard layer.
4. Backofen nach Anspruch 3, dadurch gekennzeichnet, daß unterschiedliche Flächenbereiche der Muffelwände (3) unterschiedliche Funktionalschichten aufweisen.4. Oven according to claim 3, characterized in that different surface areas of the muffle walls (3) have different functional layers.
5. Backofen nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Schutzschicht transparent ist, und daß die Innenseite der Muffelwand als Reflektor dient.5. Baking oven according to one of the preceding claims, characterized in that the protective layer is transparent, and that the inside of the muffle wall serves as a reflector.
6. Backofen nach Anspruch 1 , dadurch gekennzeichnet, daß die Backofen- muffel aus Aluminium besteht, und daß die Schutzschicht als anodisierte6. Oven according to claim 1, characterized in that the oven muffle consists of aluminum, and that the protective layer as anodized
Aluminiumoxidschicht realisiert ist.Aluminum oxide layer is realized.
7. Backofen nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Muffelwand zumindest zum Teil eine isolierende Schutz- schicht aufweist, auf der das Heizelement (13) mittels Dickschichttechnik aufgebracht ist. 7. Baking oven according to one of the preceding claims, characterized in that the muffle wall has at least in part an insulating protective layer on which the heating element (13) is applied by means of thick-film technology.
8. Backofen nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein Stabilisierungsrahmen die Backofenmuffel (1) von außen stützt, und daß der Stabilisierungsrahmen im wesentlichen durch eine Back- ofenmuffelisolation (17) gebildet ist.8. Oven according to one of the preceding claims, characterized in that a stabilizing frame supports the oven muffle (1) from the outside, and that the stabilizing frame is essentially formed by an oven muffle insulation (17).
9. Backofen nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Dicke der Muffelwand (3) etwa 0,3 bis 0,5 mm beträgt.9. Oven according to one of the preceding claims, characterized in that the thickness of the muffle wall (3) is approximately 0.3 to 0.5 mm.
10. Backofenmuffel nach einem der vorhergehenden Ansprüche. 10. Oven muffle according to one of the preceding claims.
EP99917868A 1998-03-27 1999-03-26 Baking oven with a baking oven muffle Revoked EP1064502B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02017745A EP1255083B1 (en) 1998-03-27 1999-03-26 Baking oven with a baking oven muffle

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19813787 1998-03-27
DE19813787A DE19813787A1 (en) 1998-03-27 1998-03-27 Oven with muffle
PCT/EP1999/002061 WO1999050601A1 (en) 1998-03-27 1999-03-26 Baking oven with a baking oven muffle

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP02017745A Division EP1255083B1 (en) 1998-03-27 1999-03-26 Baking oven with a baking oven muffle

Publications (2)

Publication Number Publication Date
EP1064502A1 true EP1064502A1 (en) 2001-01-03
EP1064502B1 EP1064502B1 (en) 2003-02-19

Family

ID=7862695

Family Applications (2)

Application Number Title Priority Date Filing Date
EP99917868A Revoked EP1064502B1 (en) 1998-03-27 1999-03-26 Baking oven with a baking oven muffle
EP02017745A Expired - Lifetime EP1255083B1 (en) 1998-03-27 1999-03-26 Baking oven with a baking oven muffle

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP02017745A Expired - Lifetime EP1255083B1 (en) 1998-03-27 1999-03-26 Baking oven with a baking oven muffle

Country Status (10)

Country Link
US (1) US6392203B1 (en)
EP (2) EP1064502B1 (en)
JP (1) JP2002510029A (en)
KR (1) KR20010034651A (en)
AT (1) ATE232952T1 (en)
DE (3) DE19813787A1 (en)
ES (2) ES2237637T3 (en)
PL (1) PL343159A1 (en)
TR (1) TR200002585T2 (en)
WO (1) WO1999050601A1 (en)

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US20030138661A1 (en) * 2003-02-19 2003-07-24 Ferro Corporation Sol-gel composition and method of making same
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Also Published As

Publication number Publication date
TR200002585T2 (en) 2000-11-21
ATE232952T1 (en) 2003-03-15
EP1064502B1 (en) 2003-02-19
KR20010034651A (en) 2001-04-25
JP2002510029A (en) 2002-04-02
ES2193696T3 (en) 2003-11-01
WO1999050601A1 (en) 1999-10-07
PL343159A1 (en) 2001-07-30
DE19813787A1 (en) 1999-09-30
EP1255083A1 (en) 2002-11-06
EP1255083B1 (en) 2005-02-09
US6392203B1 (en) 2002-05-21
DE59911624D1 (en) 2005-03-17
ES2237637T3 (en) 2005-08-01
DE59904331D1 (en) 2003-03-27

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