EP1264144A1 - Window for a hot chamber that is sealed off from the surroundings - Google Patents

Window for a hot chamber that is sealed off from the surroundings

Info

Publication number
EP1264144A1
EP1264144A1 EP01905762A EP01905762A EP1264144A1 EP 1264144 A1 EP1264144 A1 EP 1264144A1 EP 01905762 A EP01905762 A EP 01905762A EP 01905762 A EP01905762 A EP 01905762A EP 1264144 A1 EP1264144 A1 EP 1264144A1
Authority
EP
European Patent Office
Prior art keywords
panes
viewing window
spacers
window according
glass
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
EP01905762A
Other languages
German (de)
French (fr)
Other versions
EP1264144B1 (en
Inventor
Oliver Gros
Kurt Leutner
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.)
Schott AG
Original Assignee
Carl Zeiss AG
Schott Glaswerke AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Carl Zeiss AG, Schott Glaswerke AG filed Critical Carl Zeiss AG
Publication of EP1264144A1 publication Critical patent/EP1264144A1/en
Application granted granted Critical
Publication of EP1264144B1 publication Critical patent/EP1264144B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F24C15/02—Doors specially adapted for stoves or ranges
    • F24C15/04—Doors specially adapted for stoves or ranges with transparent panels

Definitions

  • the invention relates to a viewing window for a closed from the environment hot space, designed as a multi-pane module with at least two spaced by transparent spacers, which are gas-tightly connected to the spacers.
  • Hot rooms which are closed from the surroundings and have high operating temperatures typically have a viewing window in order to allow a view into the hot room from the outside.
  • the viewing window can be permanently installed in the wall delimiting the hot room.
  • the viewing window can also be integrated in a door of the wall delimiting the hot room in a typical form of application.
  • Typical examples are oven doors, such as oven doors, especially those with pyrolytic self-cleaning or microwave ovens.
  • Viewing windows can also be provided in fire protection doors that close off a room that only becomes a hot room in the event of a fire.
  • Viewing windows for the aforementioned purposes are typically designed as a multi-pane module, with at least two glass panes spaced apart by spacers in a composite frame.
  • the known viewing window has a window assembly with two glass panes arranged in a composite frame, which form a glass pane assembly, this window assembly being arranged in the door with a free air gap to the front glass pane, with which it forms the multi-pane module.
  • the glass pane assembly is formed in a vapor-tight manner by a circumferential seal which is also effective under the influence of heat, in particular a glass silk seal, in order to prevent vapors or vapors from the oven muffle from getting into the space between the two glass panes of the window assembly and contaminating the panes.
  • a circumferential flow barrier is provided in the free space between the front pane and the window assembly.
  • the disks separated by the spacer are hermetically sealed together with the spacer by means of a temperature-resistant adhesive, in particular a silicone adhesive.
  • the glass pane exposed to the interior temperature of the device typically consists of THERMAX 5000 ® , a tempered, heat-reflective coated soda-lime float glass, and the glass pane exposed to the ambient temperature and, if necessary, another inner one
  • the intermediate disc is made of DURAX ® , a toughened soda-lime float glass.
  • the distance between the glass panes depends on the temperature, which places special design requirements on the construction for the mechanical holding of the glass panes, the composite frame. Furthermore, the spacer is constantly exposed to deformation, which does not have a favorable effect on material fatigue.
  • a viewing window for fire protection glazing with a multi-pane module has become known, in which the panes are held at a distance by a sealing compound and are connected to one another in a sealing manner.
  • This multi-disc module has a very complex pressure compensation system with valves that open in the event of a fire and release the gas pressure that builds up as a result of the temperature increase before it causes the discs to burst.
  • Such a multi-pane module can also only be provided with a metallic frame at great expense in terms of production technology, and it has become known from DE 39 15 687 C 2 to provide this module with an edge surround made of a flexible, gas-permeable band.
  • an evacuated insulating glass consisting of two panes with intermediate spacers, for example cylindrical spacers, which are distributed according to a specific grid.
  • the edges of the glass panes are hermetically sealed by either glass solder or metal solder to prevent air from entering.
  • the distance between the disks is approx. 100 ⁇ m.
  • This multi-pane module has a number of disadvantages. For example, the use of thermally or chemically toughened glass is not possible, since the soldering temperatures are typically above the relaxation temperature of the toughened glass. Thermally toughened glasses also show deviations in flatness, which make the extremely small distances no longer possible. Relaxed glasses must either have a thickness of min.
  • the invention is based on the object of designing the viewing window for a hot space sealed off from the surroundings, designed as a multi-pane module with at least two transparent panes which are spaced apart by circumferential spacers and which are gas-tightly connected to the spacers, in such a way that despite the gas-tight ones Connection between the spacers and the disks a pressure equalization between the space between the disks and the environment without contamination of the disks is possible with simple means.
  • At least one opening is formed in the spacers, which is closed with a permeable filter which allows gases to pass through to equalize the pressure, but prevents the entry of vapors and vapors. If an increased pressure builds up in the space between the panes due to an increase in temperature, air can escape from the interior through the filter. If the space between the panes cools down again, filtered ambient air flows into the space. Any vapors and vapors that are deposited in the filter are filtered out.
  • the filter is therefore expediently designed to be exchangeable.
  • the filter is preferably designed as a filter cartridge.
  • the panes are preferably made from a glass with high thermal resistance, for example a thermally or chemically toughened borosilicate glass.
  • the panes consist of a glass ceramic which is highly temperature-resistant.
  • the spacers preferably consist of stainless steel or aluminum or a sufficiently temperature-resistant plastic.
  • the spacers are glued to the panes according to an embodiment of the invention using a temperature-resistant adhesive, preferably a silicone adhesive.
  • the viewing window according to the invention is expediently designed such that at least one of the panes is provided with a heat radiation-reflecting layer on at least one side.
  • Fig. 1 in a schematic perspective front view
  • Embodiment of a multi-disc module with filters in the disc spacers Embodiment of a multi-disc module with filters in the disc spacers
  • FIG. 2 shows a cross-sectional view of the module according to FIG. 1.
  • FIGS. 1 and 2 of the multi-pane module according to the invention of a viewing window for a hot room closed off from the surroundings has two transparent panes 1 and 2 which are held in a frame (not shown).
  • the panes 1 and 2 consist of glass with high thermal resistance, typically from a chemically or thermally toughened borosilicate flat glass, or from a transparent glass ceramic.
  • Both disks are held at a predetermined distance all around by spacers 3.
  • the spacers are typically made of stainless steel, aluminum or a sufficiently temperature-resistant plastic.
  • the spacers 3 are bonded to the glass or glass ceramic panes 1 and 2 using a temperature-stable adhesive, typically a silicone adhesive, to form a composite, which is indicated in FIG. 2 by the adhesive seam 4.
  • the spacers 3 also have bores 5 on at least one side of the module, according to FIG. 1 on the upper side and according to FIG. 2 also on the lateral spacer. These holes 5 are filled with a filter material 6, which on the one hand brakes the gas exchange rate, but prevents a build-up of pressure in the space between the two disks 1, 2 and on the other hand also prevents the penetration of vapors in the form of greases, oils and other dirt particles that prevent the space between the disks could pollute.
  • a filter material 6 which on the one hand brakes the gas exchange rate, but prevents a build-up of pressure in the space between the two disks 1, 2 and on the other hand also prevents the penetration of vapors in the form of greases, oils and other dirt particles that prevent the space between the disks could pollute
  • the multi-disc module "breathes" through the filter unit, so to speak.
  • the panes 1, 2 are preferably coated in a heat-reflecting manner, which is symbolically represented in FIG. 2 by the position 7, the layers facing one another in the case of panes coated on one side. Disks coated on both sides can also be used.
  • the essential heat transfer mechanisms radiation (through an IR reflection layer), convection (through the reduced gas exchange) and conduction (through the use of poor heat conductors such as glass, ceramic, wood, plastics) can be switched off in a simple manner, the disadvantages being known Systems do not come into play.
  • the filter 6 is preferably designed as a filter cartridge in order to enable the filter to be replaced. Therefore, the openings in the spacers, which are closed by a filter, are preferably formed in the area of the spacers that is easy to grip.
  • the multi-pane module according to the invention is used in connection with a spaced-apart front pane, preferably as a door assembly for an oven door, the free space between the module and The windshield is advantageously ventilated in order to keep the temperature of the windshield as low as possible, even during the phase of pyrolytic self-cleaning.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Securing Of Glass Panes Or The Like (AREA)
  • Joining Of Glass To Other Materials (AREA)

Abstract

According to prior art, such windows are typically configured as a multiple glass pane module which is provided with at least two transparent glass panes (1, 2) that are held by means of distance pieces (3) in such a way that said panes are spaced apart. Said distance pieces are glued together with said panes (1, 2) in a gas-tight manner. The aim of the invention is to provide a gas pressure compensation between the inner chamber between the two panes (1, 2) and the surroundings without said panes getting dirty. According to the invention, the window is designed in such a way that at least one opening (5) is embodied in the distance pieces (3). Said opening is closed by means of a permeable filter (6) that enables gas to penetrate for pressure compensation but prevents steam and vapours to enter.

Description

Sichtfenster für einen von der Umgebung abgeschlossenen Heißraum Viewing window for a hot room isolated from the surroundings
Beschreibung:Description:
Die Erfindung bezieht sich auf ein Sichtfenster für einen von der Umgebung abgeschlossenen Heiß räum, ausgebildet als Mehrscheiben-Modul mit mindestens zwei durch umlaufende Abstandshalter beabstandet gehaltene transparente Scheiben, die gasdicht mit den Abstandshaltern verbunden sind.The invention relates to a viewing window for a closed from the environment hot space, designed as a multi-pane module with at least two spaced by transparent spacers, which are gas-tightly connected to the spacers.
Von der Umgebung abgeschlossene, betriebsmäßig hohe Temperaturen aufweisende Heißräume besitzen typischerweise ein Sichtfenster, um einen Blick von außen in den Heißraum zu ermöglichen. Das Sichtfenster kann, je nach Anwendung, fest in der den Heißraum begrenzenden Wandung eingebaut sein. Das Sichtfenster kann jedoch auch bei einer typischen Anwendungsform in einer Tür der den Heißraum begrenzenden Wandung integriert sein. Typische Beispiele dafür sind Herdtüren, wie Türen von Backöfen, insbesondere solche mit pyrolytischer Selbstreinigung oder von Mikrowellenherden.Hot rooms which are closed from the surroundings and have high operating temperatures typically have a viewing window in order to allow a view into the hot room from the outside. Depending on the application, the viewing window can be permanently installed in the wall delimiting the hot room. However, the viewing window can also be integrated in a door of the wall delimiting the hot room in a typical form of application. Typical examples are oven doors, such as oven doors, especially those with pyrolytic self-cleaning or microwave ovens.
Sichtfenster können auch in Brandschutztüren vorgesehen sein, die einen Raum abschließen, der erst im Brandfall zu einem Heißraum wird.Viewing windows can also be provided in fire protection doors that close off a room that only becomes a hot room in the event of a fire.
Sichtfenster für die vorgenannten Zwecke sind typischerweise als Mehrscheiben-Modul ausgebildet, mit mindestens zwei durch Abstandshalter in einem Verbundrahmen beabstandet gehalterte Glasscheiben. Ein derartiges Sichtfenster für eine Backofentür zeigt beispielsweise die DE 44 07 084 A 1 (= EP 0 731 318 B 1). Das bekannte Sichtfenster besitzt eine Fensterbaugruppe mit zwei in einem Verbundrahmen angeordneten Glasscheiben, die einen Glasscheibenverbund bilden, wobei diese Fensterbaugruppe mit freiem Luftabstand zur frontseitigen Glasscheibe, mit dieser den Mehrscheiben-Modul bildend, in der Tür angeordnet ist. Der Glasscheibenverbund ist dabei durch eine umlaufende, auch unter Hitzeeinfluß wirksame Dichtung, insbesondere eine Glasseidendichtung in sich dampfdicht ausgebildet, um zu verhindern, daß Wrasen oder Dämpfe aus der Ofenmuffel in den Raum zwischen die beiden Glasscheiben der Fensterbaugruppe gelangen und die Scheiben verschmutzen können. Um derartige Wrasen und Dämpfe auch von der frontseitigen Scheibe des Sichtfensters abzuhalten, ist in dem freien Raum zwischen der Frontscheibe und der Fensterbaugruppe eine umlaufende Strömungsbarriere vorgesehen. Diese bekannte Konstruktion hat insbesondere den Nachteil, daß sich durch den hermetisch abgedichteten freien Raum zwischen den Glasscheiben der Fensterbaugruppe durch Temperaturerhöhung ein Druck aufbaut, der die Lebensdauer des Mehrscheiben-Moduls signifikant verkürzt.Viewing windows for the aforementioned purposes are typically designed as a multi-pane module, with at least two glass panes spaced apart by spacers in a composite frame. Such a viewing window for an oven door is shown, for example, in DE 44 07 084 A 1 (= EP 0 731 318 B 1). The known viewing window has a window assembly with two glass panes arranged in a composite frame, which form a glass pane assembly, this window assembly being arranged in the door with a free air gap to the front glass pane, with which it forms the multi-pane module. The glass pane assembly is formed in a vapor-tight manner by a circumferential seal which is also effective under the influence of heat, in particular a glass silk seal, in order to prevent vapors or vapors from the oven muffle from getting into the space between the two glass panes of the window assembly and contaminating the panes. In order to keep such vapors and vapors from the front pane of the viewing window, a circumferential flow barrier is provided in the free space between the front pane and the window assembly. This known construction has the particular disadvantage that a pressure builds up due to the hermetically sealed free space between the glass panes of the window assembly due to an increase in temperature, which significantly shortens the service life of the multi-pane module.
Um diese Druckerhöhung zu kompensieren, sieht die bekannte Konstruktion nach der DE 43 33 033 C 1 (= EP 0 646 753 B 1) einen als kompressiblen Silikonschlauch ausgebildeten Abstandshalter vor, wobei das Schlauchvolumen den Druckausgleich bei Temperaturveränderungen ermöglicht. Die durch den Abstandshalter getrennten Scheiben sind dabei zusammen mit dem Abstandshalter mittels eines temperaturbeständigen Klebers, insbesondere eines Silikonklebers, hermetisch abgeschlossenen miteinander verbunden.In order to compensate for this increase in pressure, the known construction according to DE 43 33 033 C 1 (= EP 0 646 753 B 1) provides a spacer designed as a compressible silicone hose, the hose volume allowing pressure compensation in the event of temperature changes. The disks separated by the spacer are hermetically sealed together with the spacer by means of a temperature-resistant adhesive, in particular a silicone adhesive.
Die der Innenraumtemperatur des Gerätes ausgesetzte Glasscheibe besteht typischerweise aus THERMAX 5000®, einem vorgespannten wärmereflektierend beschichteten Kalk-Natron-Float-Glas, und die der Umgebungstemperatur ausgesetzte Glasscheibe sowie ggf. eine weitere innere Zwischenscheibe bestehen aus DURAX®, einem vorgespannten Kalk-Natron- Float-Glas.The glass pane exposed to the interior temperature of the device typically consists of THERMAX 5000 ® , a tempered, heat-reflective coated soda-lime float glass, and the glass pane exposed to the ambient temperature and, if necessary, another inner one The intermediate disc is made of DURAX ® , a toughened soda-lime float glass.
Durch den kompressiblen Abstandshalter ist der Abstand zwischen den Glasscheiben von der Temperatur abhängig, wodurch an die Konstruktion für das mechanische Haltern der Glasscheiben, den Verbundrahmen, besondere konstruktive Anforderungen gestellt werden. Ferner ist der Abstandshalter ständig Verformungen ausgesetzt, was sich nicht günstig hinsichtlich der Materialermüdung auswirkt.Due to the compressible spacer, the distance between the glass panes depends on the temperature, which places special design requirements on the construction for the mechanical holding of the glass panes, the composite frame. Furthermore, the spacer is constantly exposed to deformation, which does not have a favorable effect on material fatigue.
Durch die DE 36 37 064 C 2 ist ein Sichtfenster für Brandschutzverglasungen mit einem Mehrscheiben-Modul bekannt geworden, bei dem die Scheiben durch eine Dichtmasse einmal auf Abstand gehalten und zum anderen dichtend miteinander verbunden werden. Dieser Mehrscheiben-Modul besitzt ein sehr aufwendiges Druckausgleichssystem mit Ventilen, welche sich im Brandfall öffnen und den sich durch die Temperaturerhöhung aufbauenden Gasdruck ablassen, bevor dieser die Scheiben zum Bersten bringt. Ein solcher Mehrscheiben-Modul kann zudem nur mit einem großen produktionsstechnischen Aufwand mit einem metallischen Rahmen versehen werden, wobei es durch die DE 39 15 687 C 2 bekannt geworden ist, diesen Modul mit einer Randumfassung aus einem flexiblen, gasdurchlässigen Band zu versehen.From DE 36 37 064 C 2, a viewing window for fire protection glazing with a multi-pane module has become known, in which the panes are held at a distance by a sealing compound and are connected to one another in a sealing manner. This multi-disc module has a very complex pressure compensation system with valves that open in the event of a fire and release the gas pressure that builds up as a result of the temperature increase before it causes the discs to burst. Such a multi-pane module can also only be provided with a metallic frame at great expense in terms of production technology, and it has become known from DE 39 15 687 C 2 to provide this module with an edge surround made of a flexible, gas-permeable band.
Es ist auch ein evakuiertes Isolierglas, bestehend aus zwei Scheiben mit dazwischenliegenden, nach einem bestimmten Raster verteilten, z.B. zylinderförmigen Abstandshaltern, bekannt. Die Kanten der Glasscheiben werden entweder durch Glaslot oder Metalllot hermetisch versiegelt, um den Lufteintritt zu verhindern. Der Abstand der Scheiben beträgt ca. 100 μm. Dieser Mehrscheiben-Modul besitzt eine Reihe von Nachteilen. So ist die Verwendung von thermisch bzw. chemisch vorgespanntem Glas nicht möglich, da die Löttemperaturen typischerweise oberhalb der Relaxationstemperatur des vorgespannten Glases liegen. Thermisch vorgespannte Gläser weisen ferner Ebenheitsabweichungen auf, die die extrem geringen Abstände nicht mehr möglich machen. Entspannte Gläser müssen entweder eine Dicke von min. 6 mm aufweisen, um dem Vakuum standzuhalten, wodurch der Modul extrem schwer wird, oder das Abstandshalter-Raster wird sehr dicht gestaltet, so daß die Durchsicht erschwert wird. Bei der Verwendung spezieller Lote für geringe Löttemperaturen besteht im Einsatz die Gefahr, daß die Versiegelung aufbricht. Außerdem ist damit zu rechnen, daß sich die Scheiben unter Temperaturlast verbiegen und dabei einander berühren; die Unterbrechung der Wärmeleitung wäre damit nicht mehr gegeben.Also known is an evacuated insulating glass, consisting of two panes with intermediate spacers, for example cylindrical spacers, which are distributed according to a specific grid. The edges of the glass panes are hermetically sealed by either glass solder or metal solder to prevent air from entering. The distance between the disks is approx. 100 μm. This multi-pane module has a number of disadvantages. For example, the use of thermally or chemically toughened glass is not possible, since the soldering temperatures are typically above the relaxation temperature of the toughened glass. Thermally toughened glasses also show deviations in flatness, which make the extremely small distances no longer possible. Relaxed glasses must either have a thickness of min. 6 mm to withstand the vacuum, which makes the module extremely heavy, or the spacer grid is made very dense, so that the view is difficult. When using special solders for low soldering temperatures there is a risk that the seal will break open. In addition, it can be expected that the panes will bend under temperature load and touch each other; the interruption of heat conduction would no longer exist.
Der Erfindung liegt die Aufgabe zugrunde, das eingangs bezeichnete Sichtfenster für einen von der Umgebung abgeschlossenen Heißraum, ausgebildet als Mehrscheiben-Modul mit mindestens zwei durch umlaufende Abstandshalter beabstandet gehalterte transparente Scheiben, die gasdicht mit den Abstandshaltern verbunden sind, so auszubilden, daß trotz der gasdichten Verbindung zwischen den Abstandshaltern und den Scheiben ein Druckausgleich zwischen dem Raum zwischen den Scheiben und der Umgebung, ohne daß eine Verschmutzung der Scheiben eintritt, mit einfachen Mitteln möglich ist.The invention is based on the object of designing the viewing window for a hot space sealed off from the surroundings, designed as a multi-pane module with at least two transparent panes which are spaced apart by circumferential spacers and which are gas-tightly connected to the spacers, in such a way that despite the gas-tight ones Connection between the spacers and the disks a pressure equalization between the space between the disks and the environment without contamination of the disks is possible with simple means.
Die Lösung dieser Aufgabe gelingt gemäß der Erfindung dadurch, daß in den Abstandshaltern mindestens eine Öffnung ausgebildet ist, die mit einem permeablen Filter verschlossen ist, der einen Durchtritt von Gasen zum Druckausgleich ermöglicht, jedoch den Eintritt von Dämpfen und Wrasen verhindert. Wenn sich daher im Scheiben-Zwischenraum durch eine Temperamrerhöhung ein erhöhter Druck aufbaut, kann Luft aus dem Innenraum über den Filter entweichen. Kühlt der Scheiben-Zwischenraum wieder ab, strömt Umgebungsluft gefiltert in den Zwischenraum nach. Dabei werden etwaige Dämpfe und Wrasen herausgefiltert, die sich in dem Filter ablagern.This object is achieved according to the invention in that at least one opening is formed in the spacers, which is closed with a permeable filter which allows gases to pass through to equalize the pressure, but prevents the entry of vapors and vapors. If an increased pressure builds up in the space between the panes due to an increase in temperature, air can escape from the interior through the filter. If the space between the panes cools down again, filtered ambient air flows into the space. Any vapors and vapors that are deposited in the filter are filtered out.
Gemäß einer Ausgestaltung der Erfindung ist daher der Filter zweckmäßig auswechselbar ausgebildet. Dazu ist der Filter vorzugsweise als Filterpatrone ausgebildet.According to one embodiment of the invention, the filter is therefore expediently designed to be exchangeable. For this purpose, the filter is preferably designed as a filter cartridge.
Die Scheiben werden gemäß einer ersten Weiterbildung vorzugsweise aus einem Glas mit hoher thermischer Beständigkeit, beispielsweise einem thermisch bzw. chemisch vorgespanntem Borosilicatglas, hergestellt.According to a first further development, the panes are preferably made from a glass with high thermal resistance, for example a thermally or chemically toughened borosilicate glass.
Gemäß einer alternativen Weiterbildung bestehen die Scheiben aus einer Glaskeramik, die im hohen Maße temperaturbeständig ist.According to an alternative development, the panes consist of a glass ceramic which is highly temperature-resistant.
Die Abstandshalter bestehen gemäß einer vorteilhaften Ausgestaltung der Erfindung vorzugsweise aus Edelstahl, oder Aluminium oder einem genügend temperaturbeständigen Kunststoff.According to an advantageous embodiment of the invention, the spacers preferably consist of stainless steel or aluminum or a sufficiently temperature-resistant plastic.
Zur Erzielung einer Verbundbaugruppe sind die Abstandshalter gemäß einer Ausgestaltung der Erfindung unter Verwendung eines temperaturbeständigen Klebers, vorzugsweise eines Silikonklebers, mit den Scheiben verklebt.To achieve a composite assembly, the spacers are glued to the panes according to an embodiment of the invention using a temperature-resistant adhesive, preferably a silicone adhesive.
Um eine weitere Temperaturabsenkung in der dem Heißraum abgewandten Scheibe zu erzielen, ist das erfindungsgemäße Sichtfenster zweckmäßig so ausgebildet, daß mindestens eine der Scheiben auf mindestens einer Seite mit einer Wärmestrahlungsreflektierenden Schicht versehen ist. Im folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieles beschrieben.In order to achieve a further temperature reduction in the pane facing away from the hot room, the viewing window according to the invention is expediently designed such that at least one of the panes is provided with a heat radiation-reflecting layer on at least one side. The invention is described below with reference to an embodiment shown in the drawing.
Es zeigen:Show it:
Fig. 1 in einer schematischen perspektivischen Frontdarstellung eineFig. 1 in a schematic perspective front view
Ausführungsform eines Mehrscheiben-Moduls mit Filtern in den Scheiben-Abstandshaltern, undEmbodiment of a multi-disc module with filters in the disc spacers, and
Fig. 2 eine querschnittliche Ansicht des Moduls nach Fig. 1.FIG. 2 shows a cross-sectional view of the module according to FIG. 1.
Die in den Figuren 1 und 2 dargestellte Ausführungsform des erfindungsgemäßen Mehrscheiben-Moduls eines Sichtfensters für einen von der Umgebung abgeschlossenen Heißraum weist zwei transparente Scheiben 1 und 2 auf, die in einem nicht dargestellten Rahmen gehaltert sind.The embodiment shown in FIGS. 1 and 2 of the multi-pane module according to the invention of a viewing window for a hot room closed off from the surroundings has two transparent panes 1 and 2 which are held in a frame (not shown).
Die Scheiben 1 und 2 bestehen aus Glas mit hoher thermischer Beständigkeit, typischerweise aus einem chemisch oder thermisch vorgespannten Borosilicat- Flachglas, oder aus einer transparenten Glaskeramik.The panes 1 and 2 consist of glass with high thermal resistance, typically from a chemically or thermally toughened borosilicate flat glass, or from a transparent glass ceramic.
Beide Scheiben werden umlaufend durch Abstandshalter 3 auf einem vorgegebenen Abstand gehalten. Die Abstandshalter bestehen typischerweise aus Edelstahl, Aluminium oder einem genügend temperaturbeständigen Kunststoff.Both disks are held at a predetermined distance all around by spacers 3. The spacers are typically made of stainless steel, aluminum or a sufficiently temperature-resistant plastic.
Die Abstandshalter 3 sind unter Verwendung eines temperaturstabilen Klebers, typischerweise einem Silikonkleber, mit den Glas- bzw. Glaskeramikscheiben 1 und 2 zu einem Verbund verklebt, was in der Fig. 2 durch die Klebenaht 4 angedeutet wird. Die Abstandshalter 3 besitzen ferner an mindestens einer Seite des Moduls Bohrungen 5, gemäß Fig. 1 an der oberen Seite und gemäß Fig. 2 auch an dem seitlichen Abstandshalter. Diese Bohrungen 5 sind mit einem Filtermaterial 6 gefüllt, das einerseits die Gasaustauschgeschwindigkeit bremst, aber einen Druckaufbau in dem Raum zwischen beiden Scheiben 1 , 2 verhindert und andererseits auch das Eindringen von Wrasen in Form von Fetten, Ölen und anderen Schmutzpartikeln verhindert, die den Scheibenzwischenraum verschmutzen könnten.The spacers 3 are bonded to the glass or glass ceramic panes 1 and 2 using a temperature-stable adhesive, typically a silicone adhesive, to form a composite, which is indicated in FIG. 2 by the adhesive seam 4. The spacers 3 also have bores 5 on at least one side of the module, according to FIG. 1 on the upper side and according to FIG. 2 also on the lateral spacer. These holes 5 are filled with a filter material 6, which on the one hand brakes the gas exchange rate, but prevents a build-up of pressure in the space between the two disks 1, 2 and on the other hand also prevents the penetration of vapors in the form of greases, oils and other dirt particles that prevent the space between the disks could pollute.
Der Mehrscheiben-Modul "atmet" sozusagen über die Filtereinheit.The multi-disc module "breathes" through the filter unit, so to speak.
Die Scheiben 1, 2 sind vorzugsweise wärmereflektierend beschichtet, was in Fig. 2 symbolhaft durch die Position 7 dargestellt ist, wobei bei einseitig beschichteten Scheiben die Schichten zueinander weisen. Es können auch beidseitig beschichtete Scheiben zum Einsatz kommen.The panes 1, 2 are preferably coated in a heat-reflecting manner, which is symbolically represented in FIG. 2 by the position 7, the layers facing one another in the case of panes coated on one side. Disks coated on both sides can also be used.
Durch die Erfindung kann man auf einfache Weise die wesentlichen Wärmeübertragungsmechanismen: Strahlung (durch eine IR- Reflektionsschicht), Konvektion (durch den verminderten Gasaustausch) und Leitung (durch Verwendung schlechter Wärmeleiter wie Glas, Keramik, Holz, Kunststoffe) ausschalten, wobei die Nachteile bekannter Systeme nicht zum Tragen kommen.By means of the invention, the essential heat transfer mechanisms: radiation (through an IR reflection layer), convection (through the reduced gas exchange) and conduction (through the use of poor heat conductors such as glass, ceramic, wood, plastics) can be switched off in a simple manner, the disadvantages being known Systems do not come into play.
Der Filter 6 ist vorzugsweise als Filterpatrone ausgebildet, um eine Auswechselbarkeit des Filters zu ermöglichen. Daher sind die Öffnungen in den Abstandshaltern, die durch einen Filter verschlossen sind, vorzugsweise im grifffreundlichen Bereich der Abstandshalter ausgebildet.The filter 6 is preferably designed as a filter cartridge in order to enable the filter to be replaced. Therefore, the openings in the spacers, which are closed by a filter, are preferably formed in the area of the spacers that is easy to grip.
Der erfindungsgemäße Mehrscheiben-Modul findet in Verbindung mit einer beabstandet angebrachten frontseitigen Scheibe, vorzugsweise als Türbaugruppe bei einer Backofentür Anwendung, wobei der freie Raum zwischen Modul und Frontscheibe vorteilhaft durchlüftet wird, um die Temperatur der Frontscheibe möglichst niedrig zu halten, auch während der Phase einer pyrolytischen Selbstreinigung. The multi-pane module according to the invention is used in connection with a spaced-apart front pane, preferably as a door assembly for an oven door, the free space between the module and The windshield is advantageously ventilated in order to keep the temperature of the windshield as low as possible, even during the phase of pyrolytic self-cleaning.

Claims

Patentansprüche claims
1. Sichtfenster für einen von der Umgebung abgeschlossenen Heißraum, ausgebildet als Mehrscheiben-Modul mit mindestens zwei durch umlaufende Abstandshalter (3) beabstandet gehaltene transparente Scheiben (1, 2), die gasdicht mit den Abstandshaltern verbunden sind, dadurch gekennzeichnet, daß in den Abstandshaltern (3) mindestens eine Öffnung (5) ausgebildet ist, die mit einem permeablen Filter (6) verschlossen ist, der einen Durchtritt von Gasen zum Druckausgleich ermöglicht, jedoch den Eintritt von Dämpfen und Wrasen verhindert.1. Viewing window for a hot room sealed off from the surroundings, designed as a multi-pane module with at least two transparent panes (1, 2) which are spaced apart by circumferential spacers (3) and are gas-tightly connected to the spacers, characterized in that in the spacers (3) at least one opening (5) is formed, which is closed with a permeable filter (6) which allows gases to pass through to equalize the pressure, but prevents the entry of vapors and vapors.
2. Sichtfenster nach Anspruch 1, dadurch gekennzeichnet, daß der Filter (6) auswechselbar ausgebildet ist.2. Viewing window according to claim 1, characterized in that the filter (6) is designed to be replaceable.
3. Sichtfenster nach Anspruch 2, dadurch gekennzeichnet, daß der Filter (6) als Filterpatrone ausgebildet ist.3. Viewing window according to claim 2, characterized in that the filter (6) is designed as a filter cartridge.
4. Sichtfenster nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Scheiben (1, 2) aus Glas mit hoher thermischer Beständigkeit bestehen.4. Viewing window according to one of claims 1 to 3, characterized in that the panes (1, 2) consist of glass with high thermal resistance.
5. Sichtfenster nach Anspruch 4, dadurch gekennzeichnet, daß das Glas ein thermisch bzw. chemisch vorgespanntes Borosilicatflachglas ist.5. Viewing window according to claim 4, characterized in that the glass is a thermally or chemically toughened flat borosilicate glass.
6. Sichtfenster nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Scheiben (1, 2) aus transparenter Glaskeramik bestehen.6. Viewing window according to one of claims 1 to 3, characterized in that the panes (1, 2) consist of transparent glass ceramic.
7. Sichtfenster nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Abstandshalter (3) aus Edelstahl, Aluminium oder einem genügend temperaturbeständigen Kunststoff bestehen. 7. Viewing window according to one of claims 1 to 6, characterized in that the spacers (3) consist of stainless steel, aluminum or a sufficiently temperature-resistant plastic.
8. Sichtfenster nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Abstandshalter (3) unter Verwendung eines temperaturbeständigen Klebers, vorzugsweise eines Silikonklebers, mit den Scheiben (1, 2) verklebt sind.8. Viewing window according to one of claims 1 to 7, characterized in that the spacers (3) are glued to the panes (1, 2) using a temperature-resistant adhesive, preferably a silicone adhesive.
9. Sichtfenster nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß mindestens eine der Scheiben (1, 2) auf mindestens einer Seite mit einer Wärmestrahlungsreflektierenden Schicht (7) versehen ist. 9. Viewing window according to one of claims 1 to 8, characterized in that at least one of the panes (1, 2) is provided on at least one side with a heat radiation reflecting layer (7).
EP01905762A 2000-03-15 2001-02-10 Window for a hot chamber that is sealed off from the surroundings Expired - Lifetime EP1264144B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10012577 2000-03-15
DE10012577A DE10012577A1 (en) 2000-03-15 2000-03-15 Viewing window for a hot room isolated from the surroundings
PCT/EP2001/001475 WO2001069137A1 (en) 2000-03-15 2001-02-10 Window for a hot chamber that is sealed off from the surroundings

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EP1264144A1 true EP1264144A1 (en) 2002-12-11
EP1264144B1 EP1264144B1 (en) 2004-09-15

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US (1) US6601575B2 (en)
EP (1) EP1264144B1 (en)
AU (1) AU2001233756A1 (en)
DE (2) DE10012577A1 (en)
WO (1) WO2001069137A1 (en)

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Also Published As

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EP1264144B1 (en) 2004-09-15
US6601575B2 (en) 2003-08-05
WO2001069137A1 (en) 2001-09-20
DE50103624D1 (en) 2004-10-21
DE10012577A1 (en) 2001-10-04
US20030029440A1 (en) 2003-02-13
AU2001233756A1 (en) 2001-09-24

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