EP2840320A2 - Four doté de surface intérieure autonettoyante de son moufle de four - Google Patents

Four doté de surface intérieure autonettoyante de son moufle de four Download PDF

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Publication number
EP2840320A2
EP2840320A2 EP14177376.2A EP14177376A EP2840320A2 EP 2840320 A2 EP2840320 A2 EP 2840320A2 EP 14177376 A EP14177376 A EP 14177376A EP 2840320 A2 EP2840320 A2 EP 2840320A2
Authority
EP
European Patent Office
Prior art keywords
self
cleaning
oven
reduced
reduced self
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
EP14177376.2A
Other languages
German (de)
English (en)
Other versions
EP2840320A3 (fr
EP2840320B1 (fr
Inventor
Frank Dr. Jördens
Jürgen Salomon
Philipp Schaller
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
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
Priority to PL14177376T priority Critical patent/PL2840320T3/pl
Publication of EP2840320A2 publication Critical patent/EP2840320A2/fr
Publication of EP2840320A3 publication Critical patent/EP2840320A3/fr
Application granted granted Critical
Publication of EP2840320B1 publication Critical patent/EP2840320B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F24C15/005—Coatings for ovens
    • 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
    • F24C14/00—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning

Definitions

  • the invention relates to a furnace having a furnace muffle with a self-cleaning inner surface.
  • ovens of the type in question in which an inside of the oven muffle is provided with a self-cleaning coating.
  • This self-cleaning coating is porous, so that dirt, especially fats, can penetrate into the pores. In the pores, the fat is degraded at sufficiently high temperature as they occur during operation of the furnace. This can be done for example in the so-called.
  • "Ecolysis” characterized in that the self-cleaning coating contains by their porous structure numerous oxygen storage, which support the degradation. In the ecolysis, temperatures of about 270 ° C are sufficient to eliminate impurities in the oven muffle.
  • the self-cleaning layer takes up most of the soils, e.g. during the Ecolyse also including Wrasens, from the limited by the oven muffle cooking space. These contaminants are mostly degraded at normal operating temperatures. However, especially with very large amounts of fat, it can happen that the self-cleaning layer becomes oversaturated with fat and thus loses its function. In such a case, a separate cleaning cycle must be initiated by a consumer at a sufficiently high temperature. This allows the self-cleaning layer to reduce all pollution and thereby restore its self-cleaning ability. However, it is difficult for the end user to know when such a cleaning cycle is needed. Such recognition is made more difficult by the fact that the self-cleaning layers are deliberately color-adjusted so that soiling and its possible residues are difficult to see, e.g. black.
  • an oven comprising a furnace muffle with a self-cleaning inner surface, wherein at least one visible portion of the inner surface is at least reduced self-cleaning ability.
  • a fat layer remaining on a reduced self-cleaning portion may have a brownish-yellow color, while a fully self-cleaning portion absorbs the fat (though it can no longer fully decompose) and appears black, for example. Consequently, a customer, having clearly recognized a color change of the at least one less self-cleaning portion, can start a cleaning cycle. Unnecessarily carried out cleaning cycles can be omitted and otherwise corresponding energy can be saved. In addition, the presence of a supersaturated self-cleaning layer can be avoided by insufficient cleaning cycles. The customer is not burdened with extra effort by cleaning the entire inside of the oven muffle by hand. The oven can operate in a particularly energy-efficient manner thanks to the cleaning cycles performed at the right time.
  • the oven is an oven, a microwave oven or a combination thereof, in particular in conjunction with at least one further cooking function such as a steam cooking function.
  • the oven is in particular a household oven, so a household appliance with a furnace functionality.
  • the oven muffle typically has a front loading opening which is closable by an oven door.
  • the inner surfaces of the oven muffle and the oven door define or limit a cooking chamber.
  • the cooking chamber can also be referred to as a furnace room or as a treatment room for food.
  • the self-cleaning inner surface is or has a self-cleaning layer or layer which receives its self-cleaning ability by Ecolyse. It is still a further development that the self-cleaning inner surface is or has a self-cleaning layer or layer which receives its self-cleaning ability through catalysis. In catalysis, in particular, a catalyst used to reduce soils may be bound in the self-cleaning layer.
  • the self-cleaning layer or layer may, for example, comprise porous ceramic, e.g. as a catalytically coated base body. However, the self-cleaning layer or layer may also have inorganic particles bonded.
  • a partial area which can be viewed by a customer through a feed opening of the oven muffle can be understood as a visible partial area.
  • a visible partial area may in particular be arranged on at least one side wall of the oven muffle, since a particularly high level of fat accumulation is to be expected there. In this case, the visible partial area may be present in particular on a lower half, which facilitates its visibility for an operator or user.
  • baffle wall also called hot air baffle
  • the baffle can be regarded as an independent component of the furnace muffle or as part of a side wall of the cooking chamber, in particular as part of a rear side wall or rear wall.
  • That a partial area is reduced self-cleaning ability includes both the case that there continues to be a self-cleaning ability, as well as the case that there is no self-cleaning ability more, so the sub-area is not or no longer self-cleaning.
  • the self-cleaning inner surface has a self-cleaning layer with a first pore volume and the at least one reduced self-cleaning portion has a reduced self-cleaning layer with a second, reduced pore volume.
  • the lower pore volume reduces self-cleaning ability and tends to deposit e.g. of fat on the (outer or free) surface of the reduced self-cleaning portion reinforced.
  • an average pore volume per unit area of the partial area can be understood as a pore volume.
  • the reduced self-cleaning portion is a compacted portion, which thus has a lower porosity or pore density.
  • Such compaction can be achieved, for example, by means of a local pressure treatment and / or heat treatment of a previously unreduced self-cleaning starting material at the site of the reduced self-cleaning subregion to be produced. Due to the lower porosity, for example, the absorption capacity for oxygen, which allows for ecolysis, or a catalytically active surface sink. The compression can in particular lead to a compact partial area or a partial area with a negligible porosity.
  • the reduced self-cleaning portion is a portion with at least partially filled by means of a filling pores. This also causes a lower porosity or pore density.
  • the filler may be, for example, glass.
  • the self-cleaning layer may be locally infiltrated with liquid glass.
  • the reduced self-cleaning portion is a portion of reduced thickness.
  • the porosity or pore density is retained, the absolute pore volume decreases, in particular in relation to a reduction in the layer thickness. Also, it reduces the ability to degrade soils, especially grease or oil.
  • the reduced thickness may be e.g. be achieved by material removal processes.
  • the reduced self-cleaning partial area is a partial area with partially extensive or complete removal of the self-cleaning layer.
  • This subarea thus has at least one subarea without the self-cleaning layer and at least one subarea with an undiminished self-cleaning layer.
  • the absolute pore volume decreases as compared to an undiminished self-cleaning subregion by the partial removal of the self-cleaning layer.
  • the removal of the layer may be e.g. be achieved by material removal processes.
  • the regular pattern may be a line pattern of multiple lines.
  • the line pattern may be e.g. a stripe pattern with a plurality of mutually parallel lines or a grid pattern with a plurality of parallel and mutually perpendicular lines.
  • a hole pattern e.g. with matrix-like holes, or a checkerboard pattern used.
  • a resolution of the at least one of the subregions is so high that a viewer looking into the cooking chamber from outside the cooking chamber can no longer visually resolve the subregions and the subregion thus represents an optically uniform region.
  • one observer may, for example, create the visual impression of a different color of this subregion in comparison to the untreated surrounding layer.
  • the reduced self-cleaning portion is sealed against a cooking chamber enclosed by the oven muffle.
  • the porosity and the pore volume at least largely retained, but the impurities can no longer penetrate into this subregion.
  • the reduced self-cleaning portion can be provided by means of a laser machining of an undiminished self-cleaning starting material. Such a processing is particularly easy to carry out, especially on an initially fully self-cleaning inner surface, and also precise and flexible without great effort with respect to a form of at least one reduced self-cleaning portion.
  • At least one reduced self-cleaning subregion has a shape of at least one character string, e.g. each having at least one symbol, at least one letter and / or at least one number. This allows a customer a suitable time of a cleaning cycle are presented particularly catchy.
  • the at least one less self-cleaning subregion has a form of user information. This allows the customer to see a "speaking" message.
  • the user information may in particular represent a text, e.g. "clean now”.
  • At least one optical comparison surface is provided, in particular on the oven muffle, in particular next to the reduced self-cleaning portion.
  • the optical comparison surface makes it possible in a particularly simple manner to optically balance the degree of soiling of the reduced self-cleaning portion with a predetermined threshold value.
  • the optical comparison surface may in particular have a surface which has a predefined, non-changing color. This predetermined color may in particular correspond to a color of the reduced self-cleaning portion at a predetermined contamination threshold, from which a separate cleaning cycle is recommended. Achieving the pollution threshold is by this design particularly simple and accurate by color comparison of the reduced self-cleaning portion and the optical reference surface possible.
  • the optical reference surface need not have a self-cleaning ability.
  • the Fig. Shows in a view obliquely from the front of a household oven 1 with a furnace muffle 2, which front or front has a feed opening 3.
  • the feed opening 3 can be closed by a - not shown - oven door.
  • the oven muffle 2 defines, with the closed oven door, a cooking chamber 4.
  • the oven muffle 2 has a bottom 5, a left side wall 6, a right side wall 7, a rear side wall (rear wall) 8 and a ceiling 9.
  • the rear side wall 8 has here as part of a baffle 12, which serves as a cover of an attached behind fan and / or ring heating (o. Fig.) And as a baffle.
  • the oven muffle 2 has or the walls 5 to 9 have a self-cleaning inner surface 10.
  • the self-cleaning inner surface 10 is formed by a porous, catalytic or ecolysis-capable, self-cleaning layer with a first pore volume V1.
  • a customer section 11 of the inner surface 10 which are not or only slightly self-cleaning.
  • This reduced self-cleaning capability is here effected purely by way of example by a locally reduced, second pore volume V2 of less than V1, e.g. by means of laser processing, filling with glass, etc.
  • the subregions 11 may be e.g. be sealed against the cooking chamber 4 or be reduced in thickness.
  • the sections 11 are shaped in the form of letters which each form the message "CLEAN NOW".
  • a color-predetermined optical reference surface 13 is provided here, the one facilitates color matching with the sub-area 11 for determining a pollution threshold.
  • the liquid fat will penetrate into the pores of the self-cleaning-capable subareas of the inner surface 10, but can not be completely degraded there during this cooking process. There is a supersaturation.
  • the reduced self-cleaning portions 11 now forms a superficially clear brownish-yellow greasy film, which differs in color from the rest, self-cleaning inner surface 10, which is usually black. Consequently, a customer or user clearly recognizes the words "CLEAN NOW" and will then activate a separate cleaning cycle.
  • the detection of the appropriate time for performing the separate cleaning cycle is significantly facilitated by a color comparison of a portion 11 with the reference optical surface 13.
  • the optical comparison surface 13 may for example have a brownish-yellow color.
  • the cooking chamber 4 without food to be heated to a temperature which allows the self-cleaning (eg to 270 ° C or more), so that in the self-cleaning areas of the inner surface 10 residual fats are degraded.
  • a temperature which allows the self-cleaning eg to 270 ° C or more
  • a number may include exactly the specified number as well as a usual tolerance range, as long as this is not explicitly excluded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electric Stoves And Ranges (AREA)
  • Electric Ovens (AREA)
  • Cookers (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP14177376.2A 2013-07-30 2014-07-17 Four doté de surface intérieure autonettoyante dans son moufle Active EP2840320B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14177376T PL2840320T3 (pl) 2013-07-30 2014-07-17 Piec z samoczyszczącą się powierzchnią wewnętrzną mufli pieca

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013214858.5A DE102013214858A1 (de) 2013-07-30 2013-07-30 Ofen mit selbstreinigungsfähiger Innenfläche seiner Ofenmuffel

Publications (3)

Publication Number Publication Date
EP2840320A2 true EP2840320A2 (fr) 2015-02-25
EP2840320A3 EP2840320A3 (fr) 2015-09-02
EP2840320B1 EP2840320B1 (fr) 2017-04-05

Family

ID=51210314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14177376.2A Active EP2840320B1 (fr) 2013-07-30 2014-07-17 Four doté de surface intérieure autonettoyante dans son moufle

Country Status (3)

Country Link
EP (1) EP2840320B1 (fr)
DE (1) DE102013214858A1 (fr)
PL (1) PL2840320T3 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1177434A (en) * 1967-11-14 1970-01-14 Hoover Ltd Ovens
US3783853A (en) * 1972-05-30 1974-01-08 Gen Electric Textured continuous cleaning surface for cooking ovens
DE7318690U (de) * 1973-05-18 1973-08-30 Burger Eisenwerke Ag Back- und bratgerät
DE2507659A1 (de) * 1975-02-22 1976-09-02 Miele & Cie Herd mit einer katalytisch selbstreinigenden backmuffel
JPS5436320A (en) * 1977-08-24 1979-03-17 Matsushita Electric Industrial Co Ltd Articles having selffcleanable coated layer
DE8020039U1 (de) * 1980-07-25 1984-04-05 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Garbehaelter, vorzugsweise backofenmuffel
JPS589609U (ja) * 1981-07-14 1983-01-21 株式会社東芝 高周波加熱装置
US5094222A (en) * 1989-11-17 1992-03-10 Matsushita Electric Industrial Co., Ltd. Catalytic composite and a cooker having the same
DE102004003115B4 (de) * 2004-01-21 2024-10-24 BSH Hausgeräte GmbH Gargerät
DE102013215845A1 (de) * 2013-08-12 2015-02-12 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Herstellen eines Haushaltsgerätebauteils sowie Haushaltsgerätebauteil

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
PL2840320T3 (pl) 2017-08-31
EP2840320A3 (fr) 2015-09-02
DE102013214858A1 (de) 2015-02-05
EP2840320B1 (fr) 2017-04-05

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