EP2828582A1 - Porte comportant une cavité non ventilée pour un appareil de traitement thermique ménager - Google Patents

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

Info

Publication number
EP2828582A1
EP2828582A1 EP13710990.6A EP13710990A EP2828582A1 EP 2828582 A1 EP2828582 A1 EP 2828582A1 EP 13710990 A EP13710990 A EP 13710990A EP 2828582 A1 EP2828582 A1 EP 2828582A1
Authority
EP
European Patent Office
Prior art keywords
door
compensation element
pressure compensation
cavity
airgel
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
EP13710990.6A
Other languages
German (de)
English (en)
Other versions
EP2828582B1 (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
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2828582A1 publication Critical patent/EP2828582A1/fr
Application granted granted Critical
Publication of EP2828582B1 publication Critical patent/EP2828582B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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 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 non-ventilated cavity can be hermetically sealed, in which case due to thermal expansion and contraction of a fluid in the cavity, in particular gas, during operation of the heat treatment device, high mechanical alternating stresses can occur on the door, 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. It is the object of the present invention to at least partially overcome the disadvantages of the prior art and, in particular, to provide an improved door for a domestic heat treatment appliance with at least one unvented cavity. This object is achieved according to the features of the independent claims. Preferred embodiments are in particular the dependent claims.
  • 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 unventilated cavity in particular a cavity understood, which is not intended to be flowed through by an air flow to 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, and 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 insulating ausgestaltbar.
  • Another advantage of the airgel is that
  • Melting point is so high (with silica airgel eg 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 appreciably elastic 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.
  • the airgel may only be translucent. This may be sufficient, for example, in domestic heat treatment appliances which do not require monitoring or evaluation of the object heat-treated in the heat treatment room, for example so-called sterilizers.
  • 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.
  • the "semipermeability" of the pressure compensation element is thus generally understood to be functional in this sense and is not limited to the use of a semipermeable membrane or a semipermeable filter.
  • the non-ventilated cavity may in particular be leak-tight, except for the at least one semipermeable pressure compensation element, which may result in undesired penetration of dust, liquid, etc. by gaps or the like. prevented.
  • the door may, in particular, be a cooking chamber door, since cooking rooms can typically be exposed to particularly high temperatures and consequently the cooking appliance doors have hitherto been designed in a particularly complex manner, 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 particularly simple, inexpensive and can be used with a small space requirement.
  • the membrane is preferably exchangeable.
  • the at least one semipermeable pressure compensation element has at least one combination of a valve and a filter unit.
  • a valve 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.
  • the (functional) semipermeable pressure compensation element comprises a plurality of filters and at least one filter in the form of a desiccant.
  • the semipermeable pressure compensation element may comprise two oppositely-acting valves, of which, for example, a first valve opens outward with respect to the cavity so that overpressure from the cavity through the first valve can be vented, and the second valve opens inwardly with respect to the cavity, so that sub - Pressure in the cavity is compensated by opening the second valve.
  • the 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 second valve may cooperate with a filter equipped with desiccant as filter material, 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 permeable to air and liquid impermeable.
  • 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 at least one semipermeable pressure compensation element is vapor-permeable. This allows the use of a comparatively simple and inexpensive pressure compensation element. Although it can get moisture from the environment into the cavity (eg when the door is cooled), however, this amount is relatively low due to the retention of droplets and can also be easily evaporated again in a heating of the cavity. It is also an embodiment that the at least one semipermeable pressure compensation element is arranged in a cold region of the cooking chamber door. This results in the advantage that the pressure compensation element is thermally loaded comparatively low. A cold region of the door may, in particular, be understood as meaning an area which does not directly cover a charging opening of the heat treatment space and consequently is not exposed to direct heat radiation from the heat treatment space.
  • the at least one semipermeable pressure equalization 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 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 direct heat conduction through contact between the inner pane and the adjacent airgel pane is thus prevented 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. Also, 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 in an analogous manner.
  • 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 1 1 for an oven 12.
  • the oven door 1 1 is shown in a view obliquely from the front with a left-sided portion 14 of a frame 13 shown offset.
  • the oven door 1 1 closes in the illustrated upright position indicated by dashed lines heat treatment space in the form of a furnace chamber O.
  • the oven door 1 1 is in a horizontal open position pivoted (and back) and has to Hinge 21 on.
  • the oven space O and the oven door 1 1 represent parts of the oven 12.
  • the frame 13 is laterally configured circumferentially and covered on the front side (facing away from the oven space O) by means of 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 plate 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 1 1 is made possible in the oven O space.
  • the oven door 1 1 has a corresponding semi-permeable 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 1. 1.
  • 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 during heating gas and possibly moisture present in moisture can escape from the pressure compensation element 20, so that a pressure-induced mechanical stress on the oven door 1 1 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 1 1 can be prevented, since the airgel discs 18, 19 are highly thermally insulating. Due to heating of the airgel disks 18, 19, it is possible to remove any moisture held in them.
  • the front cover and / or the inner cover may at least partially be integrated with the frame.

Landscapes

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

Abstract

L'invention concerne une porte (11), destinée à un appareil de traitement thermique ménager (12), en particulier à une rôtissoire, comportant au moins un cadre enveloppant latéral (13) qui est recouvert à l'avant d'un cache frontal (15) transparent à la vue au moins par endroits et recouvert à l'intérieur d'un cache intérieur (16) transparent à la vue au moins par endroits. Le cadre (13), le cache frontal (15) et le cache intérieur (16) délimitent une cavité (17) non ventilée. La cavité (17) est remplie au moins en partie d'un aérogel transparent et la porte (11) comporte au moins un élément égalisateur de pression semi-perméable (20) servant à égaliser la pression entre la cavité (17) et l'environnement (U). Un appareil de traitement thermique ménager (12), en particulier une rôtissoire, est équipé au moins d'un espace de traitement thermique (O) qui peut être fermé par une porte (11).
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 true EP2828582A1 (fr) 2015-01-28
EP2828582B1 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, 55122 Mainz Sichtfenster für einen von der Umgebung abgeschlossenen Heißraum
DE20009546U1 (de) * 2000-05-27 2000-08-10 Bayer Isolierglas- und Maschinentechnik GmbH, 79215 Elzach Verschluß für Geräte mit hoher Innentemperatur
US7635411B2 (en) * 2004-12-15 2009-12-22 Cabot Corporation Aerogel containing blanket
WO2008028128A1 (fr) * 2006-09-01 2008-03-06 Pleotint, L.L.C. Systèmes thermochromes d'échange de ligands, (letc)
DE102007028911A1 (de) * 2007-06-22 2009-01-02 Solan Gmbh Vorrichtung zum Druckausgleich für ein Gasvolumen beinhaltende Isolierglaseinheiten

Also Published As

Publication number Publication date
WO2013139638A1 (fr) 2013-09-26
EP2828582B1 (fr) 2017-08-09
DE102012204544A1 (de) 2013-09-26

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