EP2828582B1 - Porte comportant une cavité non ventilée pour un appareil ménager de traitement thermique. - Google Patents

Porte comportant une cavité non ventilée pour un appareil ménager de traitement thermique. Download PDF

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Publication number
EP2828582B1
EP2828582B1 EP13710990.6A EP13710990A EP2828582B1 EP 2828582 B1 EP2828582 B1 EP 2828582B1 EP 13710990 A EP13710990 A EP 13710990A EP 2828582 B1 EP2828582 B1 EP 2828582B1
Authority
EP
European Patent Office
Prior art keywords
door
cavity
pressure equalisation
heat treatment
semipermeable
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.)
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Application number
EP13710990.6A
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German (de)
English (en)
Other versions
EP2828582A1 (fr
Inventor
Joschka BARZ
Robert KÜHN
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
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BSH Hausgeraete GmbH
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Publication of EP2828582A1 publication Critical patent/EP2828582A1/fr
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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
    • F24C15/02—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 door for a household heat treatment device, in particular cooking chamber, at least comprising a laterally encircling frame, which is front covered by an at least partially opaque front cover and the inside is covered by an at least partially opaque inner cover, wherein the frame, the front cover and the Inner cover enclose an unvented cavity.
  • the unvented cavity may be hermetically sealed, in which case due to a thermal expansion and contraction of a fluid in the cavity, in particular gas, during operation of the heat treatment device high mechanical stresses on the door may occur, which can lead to their damage.
  • the cavity may be evacuated, but a long-term stable maintenance of the vacuum is very complex and expensive.
  • the non-ventilated cavity may have a simple vent for pressure equalization, through which, however, dust, vapor etc. can penetrate into the cavity.
  • WO 2008/028099 A2 discloses an energy efficient, thermochromic device that can be used to let sunlight into a building or structure when there is no sunlight or a high angle of sunshine, and substantially block sunlight when it is directly irradiated to the window. Such a device can also be used in an oven door according to this document.
  • DE 42 40 096 A1 discloses a pressure compensating device with filter action for a device or article for balancing pressure differences between two atmospheres having different and fluctuating pressures, the atmospheres in particular having different temperatures and being differently composed.
  • the composition relates not only to gaseous but also to liquid and solid constituents, the latter essentially in the form of droplets (for example aerosols) and liquid films or dust-like particles.
  • a filter effect is achieved at the same time during pressure equalization such that impairments of the function of the device or the object can be avoided, the filter effect depending on the requirements down to the molecular filter range (molecular sieve) can go down.
  • EP 0 475 285 A2 discloses an oven with a thermal insulated baking muffle equipped with an insulating layer of an airgel.
  • a door for a household heat treatment device at least comprising a laterally encircling frame, which is covered at the front by means of an at least partially opaque front cover and the inside is covered by an at least partially opaque inner cover, wherein the frame, the front cover and the inner cover enclose an unvented cavity.
  • An unvented cavity is understood in particular to mean a cavity which is not intended to be flowed through by an air stream for its cooling.
  • the frame may be a one-piece frame or a multi-part frame.
  • the frame may serve as a door profile.
  • the cavity is at least partially filled with translucent airgel
  • the door has at least one semipermeable pressure compensation element for pressure equalization between the cavity and an environment.
  • the translucent airgel ensures a sufficient view through the door and thus insight into a heat treatment space to be closed by the door.
  • Airgel is also highly thermally insulating (thermal conductivity of only between 0.014 and 0.05 W / (m ⁇ K)), so that a heat flow from the heat treatment room in the outdoor area can be significantly reduced and the door is therefore very good heat insulation réellestbar.
  • Another advantage of the airgel is that Melting point is so high (with silica airgel, for example, at about 1200 ° C), that it at temperatures, as they occur in household appliances (up to 500 ° C in a cooking chamber of a baking oven during a pyrolysis operation), neither melts nor worth mentioning elastically or plastically deformed.
  • airgel is non-flammable and non-toxic.
  • airgel is transparent or practically transparent (quasi-transparent).
  • an airgel thickness-dependent insight into a heat treatment space is made possible, for example for monitoring food to be cooked. Occurring in individual cases material haze by moisture is typically reversible up to a material-dependent limit by heating (energy input from the outside) of the airgel on its Desorptionsenthalpie.
  • this is not mandatory and the airgel may only be translucent. This may be sufficient, for example, in household heat treatment appliances which do not require monitoring or evaluation of the object heat-treated in the heat treatment room, e.g. in so-called sterilizers.
  • airgel In addition to absorbing moisture, airgel can also trap fine dust particles or oil droplets, etc.
  • the (functional) semipermeable pressure compensation element at least holds solids (dust) and liquid (oil droplets, water droplets, etc.). back, but lets air through. This allows pressure equalization to take place, but prevents penetration of significantly detrimental liquids. Overall, this provides a mechanically less loaded, inexpensive door which can be cleaned with little effort.
  • the airgel in particular provides a narrow and lightweight door.
  • the "semipermeability" of the pressure compensation element is therefore generally functional in this sense and is not limited to the use of a semipermeable membrane or a semi-permeable filter.
  • the at least one semipermeable pressure compensation element is permeable to air and impermeable to liquids.
  • air permeability By means of the air permeability, a pressure equalization is made possible by means of the impermeability to liquid (for substances in the liquid state, including droplets) prevents penetration of oil, water, etc.
  • the (functional) semipermeable pressure compensator has two oppositely-acting valves of which a first valve opens outwardly with respect to the cavity so that excess pressure from the cavity is vented through the first valve and a second valve opens inwardly with respect to the cavity that negative pressure in the cavity can be compensated by opening the second valve.
  • the second valve cooperates with a filter equipped with desiccant as filter material. It can e.g. be upstream of this flow or downstream.
  • This filter is thus a general filter in the sense that it can retain certain substances when passing through a fluid, here in particular water.
  • the at least one semipermeable pressure compensation element is further vapor permeable. This allows the use of a comparatively simple and inexpensive pressure compensation element. While moisture from the environment may enter the cavity (e.g., as the door cools), this amount is relatively low due to the retention of droplets and may also be readily re-evaporated upon heating of the cavity.
  • the non-ventilated cavity may in particular be leak-tight, except for the at least one semipermeable pressure compensation element, which may cause unwanted intrusion of dust, liquid, etc. through gaps or the like. prevented.
  • the door may be a cooking chamber door, since cooking rooms can typically experience particularly high temperatures and their cooking appliance doors have thus hitherto been designed to be particularly expensive, e.g. equipped with a ventilation.
  • the cooking appliance door may in particular be a baking-oven door, in particular a baking-oven door of a pyrolysis-capable baking oven.
  • the type of door is not limited and may e.g. include a door of a bakery, a hinged door or a revolving door.
  • the at least one semipermeable pressure compensation element has or is at least one membrane. This is very simple, inexpensive and with a low requirement for space can be used.
  • the membrane is preferably exchangeable.
  • the at least one semipermeable pressure compensation element has at least one combination of the inwardly opening valve and the filter unit cooperating therewith. Through the valve, a volume of a compensating air flow is minimized, allowing a long-lasting filter capability of the filter unit.
  • the filter unit is preferably exchangeable.
  • valves can be arranged spatially close, in particular in a structural unit, or can be arranged spatially separated.
  • the valves may in particular be check valves.
  • the valves may be designed so that one or more valves are open or closed at normal pressure (without pressure difference).
  • the at least one semipermeable pressure compensation element is arranged in a cold region of the cooking chamber door.
  • a cold region of the door may, in particular, be understood to mean a region which does not directly cover a charging opening of the heat treatment chamber and consequently is not exposed to direct heat radiation from the heat treatment chamber.
  • the at least one semipermeable pressure compensation element is arranged in the frame.
  • the pressure compensation element is positioned in a region in which it is opposite a flange in a closed position of the door and thus protected against external stress.
  • the frame is relatively cold.
  • the at least one semipermeable pressure compensation element may, in particular, be located in a left-side and / or right-side section of the frame.
  • the at least one semipermeable pressure compensation element is on the underside portion of the frame.
  • any condensate accumulating in the cavity can be dissipated particularly effectively.
  • a water film can form more difficult on the pressure compensation element.
  • Particularly preferred is a slightly inclined mounting.
  • the at least one semipermeable pressure compensation element is covered by a permeable protective cover, e.g. a grid or perforated screen.
  • the front cover is a front glass panel and the inner cover is an inner glass panel. This allows a particularly large viewing surface.
  • the front cover and / or the inner cover may have a frame in which a viewing window is inserted.
  • the airgel is in the form of at least one airgel disc.
  • pane is understood to mean a general transparent molded body or monolith, which in particular also has a mechanical appearance Be sensible plate-shaped or disc-shaped.
  • the airgel disc can thus be designed in particular as a plate.
  • the door then has at least one intermediate disc (between the windscreen and the inner pane) in the form of an airgel disc.
  • a very steep temperature gradient can occur on the airgel disk during operation of a household heat treatment device, so that a surface temperature on the inside (facing the heat treatment chamber) of the airgel disk is high, which results in heat removal from the heat treatment space (eg by air cooling and / or or thermal radiation) low, but a surface temperature on the (the heat treatment space facing away) outside or front side is very low, so that here a high contact safety is possible.
  • a waiver of a door ventilation is also possible for very high temperatures, which in turn creates new space and thus allows more freedom of design.
  • at least one conventional glass pane can be replaced by the at least one airgel pane, which results in considerable weight savings.
  • a single-piece airgel disc (or airgel plate) has a thickness between about 5 mm to 40 mm, preferably between about 10 mm and 20 mm, more preferably between about 12 mm and 16 mm ,
  • the at least one airgel disc is separated at least with respect to the inner pane by a gap.
  • This gap further improves thermal insulation, since such direct heat conduction is prevented by contact between the inner pane and the adjacent airgel pane and heat transfer can only be generated by radiant heat and by gas movement or convection in the gap.
  • the gap not more than 4 mm, in particular not more than 2 mm, in particular not more than about 1 mm, measures. It is an advantageous for avoiding unwanted contacting development that the gap is at least 0.1 mm wide.
  • the at least one airgel disc is also separated from the front screen by a gap, in particular to avoid contact with the windscreen.
  • a plurality of spaced-apart airgel disks may be housed in the cavity.
  • the at least one airgel disc is made of silica airgel.
  • the object is also achieved by a household heat treatment device having at least one heat treatment space that can be closed by a door, wherein the door is a door as described above. This gives the same benefits to the door, and the household heat treatment device can be designed analogously.
  • the household heat treatment device may preferably be a cooking appliance, in particular having an oven, in particular with a pyrolysis capability.
  • the Fig. Shows a door for a household heat treatment device in the form of a oven door 11 for an oven 12.
  • the oven door 11 is shown in a view obliquely from the front with a left-sided portion 14 of a frame 13 shown offset.
  • the oven door 11 closes in the illustrated upright position indicated by dashed lines heat treatment space in the form of a furnace chamber O.
  • the oven door 11 is pivotable in a horizontal opening position (and back) and has to Hinge 21 on.
  • the oven space O and the oven door 11 represent parts of the oven 12.
  • the frame 13 is laterally configured circumferentially and front side (the furnace chamber O facing away) covered by a front cover in the form of a front glass pane 15.
  • a front cover in the form of a front glass pane 15 On the inside (facing the furnace chamber O), the frame is covered by means of an inner cover in the form of an inner glass pane 16.
  • the frame 13, the front glass pane 15 and the inner glass pane 16 enclose an unvented cavity 17 tightly.
  • Within the cavity 17 are two superimposed, plate-shaped airgel discs 18, 19 of a respective thickness between about 12 mm and 16 mm.
  • the inner airgel disc 18 is separated from the inner glass panel 16 by a gap d of more than 0.1 mm, but not more than 1 mm.
  • the outer airgel disc 19 is opposite the front glass pane 15 is separated by a gap. Since the airgel discs 18, 19 are translucent and translucent, a large field of view through the oven door 11 in the oven space O is possible.
  • the oven door 11 has a corresponding semipermeable pressure compensation element 20.
  • the pressure compensation element 20 is arranged here in a lower region of the left-side portion 14 of the frame 13 and thus in a cold region of the oven door 11.
  • the pressure compensation element 20 comprises at least one membrane.
  • the pressure compensation element 20 is permeable to air and permeable to vapor, but liquid impermeable.
  • the pressure compensation element 20 is surrounded by a permeable protective cover 22, e.g. a grid, covered.
  • the oven space O is heated, which in turn heats the cavity 17.
  • the expanding in the cavity 17 in a heating gas and possibly vapor present moisture can escape from the pressure compensation element 20, so that a pressure-induced mechanical load on the oven door 11 can be prevented.
  • the airgel discs 18, 19 By means of the airgel discs 18, 19, a stronger heating of the front glass pane 15 and the non-ventilated oven door 11 can be prevented because the airgel discs 18, 19 are highly thermally insulating. Due to a heating of the airgel disks 18, 19, if necessary, moisture held in them can be removed.
  • the front cover and / or the inner cover may at least partially be integrated with the frame.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)

Claims (10)

  1. Porte (11) pour appareil de traitement thermique ménager (12), en particulier porte d'enceinte de cuisson, comportant au moins un cadre entourant latéral (13), recouvert à l'avant d'un panneau avant (15) transparent à la vue au moins par endroits et recouvert à l'intérieur d'un panneau intérieur (16) transparent à la vue au moins par endroits, le cadre (13), le panneau avant (15) et le panneau intérieur (16) enfermant une cavité (17) non ventilée,
    - ladite porte (11) comportant au moins un élément de compensation de pression semi-perméable (20) servant à compenser la pression entre la cavité (17) et un environnement (U), lequel élément (20) est perméable à l'air et imperméable au liquide,
    - ledit au moins un élément de compensation de pression semi-perméable (20) comportant une soupape ouvrant vers l'intérieur et une soupape ouvrant en sens inverse vers l'extérieur,
    - ladite soupape ouvrant vers l'intérieur coopérant avec une unité de filtration comportant un agent dessiccateur comme matériau filtrant,
    caractérisée en ce que
    - la cavité (17) est remplie au moins partiellement d'un aérogel transparent (18, 19) et
    - le au moins un élément de compensation de pression semi-perméable (20) est perméable à la vapeur.
  2. Porte (11) selon la revendication 1, caractérisée en ce que le au moins un élément de compensation de pression semi-perméable (20) est agencé dans une zone froide (13, 14) de la porte (11).
  3. Porte (11) selon l'une des revendications précédentes, caractérisée en ce que le au moins un élément de compensation de pression semi-perméable est agencé dans le cadre (13).
  4. Porte (11) selon la revendication 3, caractérisée en ce que le au moins un élément de compensation de pression semi-perméable est situé sur une partie inférieure du cadre.
  5. Porte (11) selon la revendication 4, caractérisée en ce que le au moins un élément de compensation de pression semi-perméable est monté de manière légèrement inclinée.
  6. Porte (11) selon l'une des revendications précédentes, caractérisée en ce que le au moins un élément de compensation de pression semi-perméable (20) est recouvert d'un cache de protection perméable (22).
  7. Porte (11) selon l'une des revendications précédentes, caractérisée en ce que le panneau avant est une vitre avant (15) et le panneau intérieur une vitre intérieure (16).
  8. Porte (11) selon l'une des revendications précédentes, caractérisée en ce que l'aérogel se présente sous la forme d'au moins un panneau d'aérogel (18, 19).
  9. Porte (11) selon l'une des revendications précédentes, caractérisée en ce que le au moins un élément de compensation de pression semi-perméable (20) comporte au moins une combinaison composée de la soupape ouvrant vers l'intérieur et de l'unité de filtration coopérant avec ladite soupape.
  10. Appareil de traitement thermique ménager (12), en particulier appareil de cuisson, comportant au moins une enceinte de traitement thermique (O) pouvant être fermée par une porte, caractérisé en ce que ladite porte est une porte (11) selon l'une des revendications précédentes.
EP13710990.6A 2012-03-21 2013-03-12 Porte comportant une cavité non ventilée pour un appareil ménager de traitement thermique. Active EP2828582B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012204544A DE102012204544A1 (de) 2012-03-21 2012-03-21 Tür mit unbelüftetem Hohlraum für ein Haushalts-Wärmebehandlungsgerät
PCT/EP2013/054935 WO2013139638A1 (fr) 2012-03-21 2013-03-12 Porte comportant une cavité non ventilée pour un appareil de traitement thermique ménager

Publications (2)

Publication Number Publication Date
EP2828582A1 EP2828582A1 (fr) 2015-01-28
EP2828582B1 true EP2828582B1 (fr) 2017-08-09

Family

ID=47913383

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13710990.6A Active EP2828582B1 (fr) 2012-03-21 2013-03-12 Porte comportant une cavité non ventilée pour un appareil ménager de traitement thermique.

Country Status (3)

Country Link
EP (1) EP2828582B1 (fr)
DE (1) DE102012204544A1 (fr)
WO (1) WO2013139638A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4028743A1 (de) * 1990-09-11 1992-03-12 Miele & Cie Backofen mit einer backmuffel
DE4240096A1 (de) * 1992-11-28 1994-06-01 Juno Groskuechen Gmbh Druckausgleichsvorrichtung
DE4333033C1 (de) * 1993-09-29 1995-05-24 Schott Glas Temperaturdämmendes Sichtfenster oder -türe für ein Gerät mit von seiner Umgebungstemperatur abweichender Innentemperatur
DE20022402U1 (de) * 2000-03-15 2001-08-02 Schott Glas Sichtfenster für einen von der Umgebung abgeschlossenen Heißraum
DE20009546U1 (de) * 2000-05-27 2000-08-10 Bayer Isolierglas & Maschtech Verschluß für Geräte mit hoher Innentemperatur
US7635411B2 (en) * 2004-12-15 2009-12-22 Cabot Corporation Aerogel containing blanket
EP2436750A3 (fr) * 2006-09-01 2014-08-20 Pleotint, L.L.C. Systèmes thermochromiques à échange de ligands (LETC)
DE102007028911A1 (de) * 2007-06-22 2009-01-02 Solan Gmbh Vorrichtung zum Druckausgleich für ein Gasvolumen beinhaltende Isolierglaseinheiten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2828582A1 (fr) 2015-01-28
WO2013139638A1 (fr) 2013-09-26
DE102012204544A1 (de) 2013-09-26

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