EP1470371B1 - Elektroherd - Google Patents

Elektroherd Download PDF

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Publication number
EP1470371B1
EP1470371B1 EP03715064A EP03715064A EP1470371B1 EP 1470371 B1 EP1470371 B1 EP 1470371B1 EP 03715064 A EP03715064 A EP 03715064A EP 03715064 A EP03715064 A EP 03715064A EP 1470371 B1 EP1470371 B1 EP 1470371B1
Authority
EP
European Patent Office
Prior art keywords
enclosure
oven
cabinet
domestic electric
electric cooking
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.)
Expired - Lifetime
Application number
EP03715064A
Other languages
English (en)
French (fr)
Other versions
EP1470371A1 (de
Inventor
Michel Klinger
Alain Didier-Laurent
Dominique Antoine
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.)
SEB SA
Original Assignee
SEB SA
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 SEB SA filed Critical SEB SA
Publication of EP1470371A1 publication Critical patent/EP1470371A1/de
Application granted granted Critical
Publication of EP1470371B1 publication Critical patent/EP1470371B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F24C15/08—Foundations or supports plates; Legs or pillars; Casings; Wheels
    • 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
    • F24C15/36—Protective guards, e.g. for preventing access to heated parts

Definitions

  • the present invention relates to electric oven-type cooking appliances enclosing a cooking chamber inside which are arranged radiant type heating means, essentially in the infrared.
  • the present invention relates in particular to ovens that can be placed on a table, as opposed to so-called "built-in” ovens.
  • the ovens are kilns of very variable capacity, ranging from about 10 liters to nearly 40 liters, but all generally have cooking temperatures of up to 250 ° C inside the cooking chamber .
  • the present invention relates to furnaces comprising means for heating the air of the enclosure and food therein by heating elements radiating in the infrared, which can be completed by means of stirring the air . Such furnaces thus see the temperature of their walls rise, as opposed to microwave ovens in particular.
  • This temperature constraint frequently causes the cooking chamber to be clad with a metal structure consisting of steel sheets that can be lacquered or enamelled externally and that constitute the outer casing of the oven. These plates becoming heated in turn represent a burn hazard for the user.
  • the document FR 2 732 097 describes in particular a baking oven door comprising a frame on which are mounted a glass inner wall and a plastic outer wall, said door comprising ventilation means between the two walls in order to reduce the temperature. of the outer wall.
  • the present invention aims to reduce the risk of burn by contact of the outer parts of a household appliance operating by radiation and convection, using simple and inexpensive means.
  • the present invention is achieved with the aid of an electric cooking appliance having the characteristics of the characterizing part of claim 1.
  • the lowering of the temperature of the furnace cladding makes it possible to use a material that is not very resistant to heat, a material that is generally of low cost.
  • the covering also covers most of the rear face of the cooking chamber. Indeed, although the rear face of the oven is less accessible than the side faces and the upper face, it is interesting that the covering also covers a significant portion of the rear face of the enclosure to minimize the risk of burns.
  • the means limiting the heating of the cladding of the furnace comprise a confinement by partitioning the space separating the vault of the enclosure from the upper part of the cladding.
  • This confinement can be obtained in different ways, including performing no ventilation opening in the cladding, especially at the roof and parts of the side walls located at and above the vault of the enclosure, thus minimizing air circulation.
  • a flow of air in the volume between the vault of the enclosure and the roof of the casing causes an increase in the temperature of said roof, by mixing the air produced.
  • hot spots are then generated at the openings of the cladding, locally increasing the temperature, and may lead to a degradation of the material used to achieve the cladding.
  • This closure of the space is however not waterproof but qualitatively means a maximum limitation of air exchanges with the outside.
  • the residual openings of construction do not participate significantly in the heat exchange with the outside.
  • An improvement of this confinement of the space above the vault consists in providing a peripheral rim to the vault face of the enclosure.
  • a heat shield is disposed in the confinement space, between the upper part of the casing and the vault of the enclosure, making it possible to further reduce the temperature of the roof of the casing.
  • the heat shield covers at least the entire surface of the vault of the enclosure.
  • the heat shield has vertical walls inclined downwards and extending, at the side faces and the rear face, to the cladding of the oven, thus creating a double partitioning of the air , on the one hand between the vault of the enclosure and the heat shield, and on the other hand between the heat shield and the cladding of the oven.
  • a spacer made of a material of low thermal conductivity (for example less than 1 W m -1 K -1 ) is arranged substantially in the middle of the heat shield extending from both sides. other of said screen, perpendicular to it, on the one hand to near the vault of the enclosure, and other by up to the dressing.
  • This spacer thus makes it possible to keep a minimum distance between, on the one hand, the vault of the enclosure and the heat shield, but also between the roof of the covering and the said heat shield.
  • a metal strip is disposed substantially vertically above the door, on at least the length of the cooking chamber, said strip being connected to the casing by an insulating ring.
  • a simple solution may be to replace locally and on a shallow depth, the dressing by a metal wall which will allow to dissipate calories by acting as a safety valve since the calories will preferentially be exchanged with the outside by this headband, and without mixing air.
  • This aspect is particularly important when the cooking is carried out with the door open, generating a significant heat flow upwards, directly above the door.
  • the metal strip has thin openings to promote the exchange of calories between the inside of the enclosure and the outside and thus increase the thermal brake effect.
  • These thin openings in the upper part and the front of the oven are however sufficiently thin and eccentric not to cause a consequent air mixing or air circulation.
  • the insulating rod has a local thermal brake function between the metal zone and the cladding.
  • this ring is made of heat-resistant plastic, such as poly (butanediol-1,4 terephthalate), more commonly known as PBT.
  • Heat-resistant means a material with good mechanical properties, when its temperature increases, over a wide temperature range.
  • the term technical plastic is commonly used to characterize such materials.
  • One of the advantages of using PBT, from this point of view, is to keep a high Young's modulus up to temperatures close to its melting point. Moreover, PBT has a high rigidity.
  • the cladding of the oven is thermoplastic plastic type.
  • thermoplastic material such as for example polypropylene (PP)
  • PP polypropylene
  • the use of a plastic material also brings the advantage of having a contact temperature between the skin and this material lower than it would be with a conventional enamelled or coated sheet cladding, for the same temperature. dressing. This is due to the difference between the effusivities PP and metal materials such as steel.
  • the contact of the skin with this coating will be established at a lower temperature if the covering is made of PP rather than enamelled sheet or coated for example.
  • plastic allows easily automated molding operations that allow greater freedom in the design of the product.
  • the oven 1 comprises, as is known, a cooking chamber 2 composed of five sheets defining faces 4a to 4e, said sheets being assembled forming an open parallelepipedal volume. in part before.
  • a door is disposed at this opening and closes the volume of the enclosure.
  • the lateral faces 4a, 4b comprise grooves 6 for the positioning of a cooking grate.
  • the control portion of the oven, not shown, is adjacent to the face 4b, outside the enclosure.
  • the horizontal faces of the arch 4c and sole 4e respectively comprise embossed bosses 8 and 10 which make it possible to maintain heating resistors 32, visible in FIGS. 2, 4 and 5, at a distance from the surface of said faces.
  • the sole bosses 10 further comprise hooks 12 for fixing the resistance.
  • the arch face 4c is bordered by a peripheral rim 14, derived from either of said faces by folding or lateral faces.
  • This enclosure is arranged on a base, not shown, which may be metal or high temperature resistant PBT type plastic as previously explained.
  • the base can be in PP with PBT supports.
  • the oven comprises a casing 16 of the enclosure consisting of four walls 18a to 18d.
  • This dressing has no openings or ears, as it is frequently encountered in the ovens trade.
  • the face 18c forming the roof of the casing creates, with the rim 14 and the beginning of the vertical faces, a partition which creates a confinement of the space above the vault 4c of the enclosure.
  • the walls 18a and 18b have a return 19 to the front face of the oven, to hide the inner edges of the metal carcass while giving the oven a homogeneous shape.
  • This furnace covering is disposed on the base supporting the enclosure, by means of locking clips 40 which are positioned in suitable housings made in said base.
  • locking clips 40 which are positioned in suitable housings made in said base.
  • the areas of contact between the enclosure and the base are spaced as far as possible from the fixing zones of the clips.
  • the plate of the enclosure is cut at the contacts with the base to minimize thermal bridges between the enclosure and the base.
  • the base has significant vertical walls, further limiting the heat transfer from the base to the cladding.
  • a heat shield 20 is disposed between the roof 4c of the enclosure and the roof 18c of the casing.
  • This heat shield covers the entire surface of the vault of the cooking chamber and extends even beyond the wall 4b above the oven control part.
  • This heat shield 20 also has parts folded at the ends of its four edges, and folded down.
  • the lateral portions 22a and 22b, as well as the rear portion 22d, visible in FIGS. 2 and 3, are rather long and extend as far as the cladding, coming to be positioned on locking lugs 34. This enables them to protect effectively the respective walls 18a, 18b and 18d of the cladding by closing the hottest space at the upper part of the enclosure, while ensuring the correct positioning of the screen relative to the dressing.
  • the front portion 22c is shorter and is positioned against the rim 14 before, which allows a predetermined distance between the vault 4c of the enclosure and the heat shield 20 and reinforces the partitioning of the space between the reflector and speaker.
  • a cylindrical spacer 24 is positioned in an opening 26 of the heat shield, substantially in the middle thereof.
  • This spacer 24 has a recess in its diameter so as to have a bearing surface for its positioning on said heat shield.
  • the spacer 24 thus extends on both sides of the heat shield 20, in particular to come into contact with the roof 18c of the covering.
  • a game is left with the vault 4c of the enclosure, essentially to avoid creating a thermal bridge with this surface which is raised to high temperature during operation of the oven.
  • this game makes it possible to overcome the differences in tolerances on the parts, in order to ensure assembly of the cladding without deformation of said cladding and / or the heat shield.
  • this spacer serves to mechanically reinforce the roof 18c of the cladding and prevents a heavy object placed on the roof does not come to create a significant deformation of the dressing.
  • this spacer is made of a material having a low thermal conductivity.
  • a material such as plastic fulfills these conditions, having a thermal conductivity of the order of 0.2 - 0.3 W m -1 K -1 .
  • this plastic will have to withstand high temperatures, since the contact with the vault of the enclosure is possible.
  • the reduction of heat exchange and the arrangement of the screen can significantly reduce the temperature of the coating, so that plastics, such as polypropylene (PP) can be used.
  • plastics such as polypropylene (PP)
  • the realization of such a dressing, by molding, is then possible, its monobloc form facilitating the mounting of the oven.
  • thermoplastic or thermosetting material compatible with these temperatures and having a low thermal conductivity, for example less than 1 W m -1 K -1 .
  • the heat shield descends sufficiently low along the enclosure so that it is not necessary to use a heat-resistant plastic, in particular for the realization of the support tabs 34 of the screen, made also in PP.
  • the cladding of the oven comprises a strip 28 at the base of the oven door.
  • This strip is metallic and is connected to the plastic covering by two rods 30, 31 insulating.
  • the temperature can increase suddenly and reach high values when the door is between open or when the seal is defective, or in the absence of seal.
  • the limitation of the rise in temperature of the covering can then be achieved by multiplying the heat shields and increasing their quality.
  • the links between the ring and the strip and between the ring and the plastic covering are such that the number of contact points is limited to the number necessary to ensure the mechanical positioning without local creep of the materials at the points of contact, and thus limit the transfer by thermal conduction. Particular care should be taken to keep the points of contact between the strip and the ring of the points of contact between the ring and the covering as far as possible in order to minimize the heat transfer from the strip to the cover via the ring.
  • the strip bears on and under the rim 14 on the front face of the oven, producing a recess 36 on which the door is pressed in the closed position. In this way, the calories escaping through the front face of the cooking chamber, not shown, are inevitably collected by said strip.
  • FIG 4 clearly shows that the spacer is used to maintain the heat shield 20 substantially midway between the vault 4c of the cooking chamber and the roof 18c of the cabinet.
  • the roof 18c of the cladding is curved, which ensures a better mechanical stability of said cladding when it is brought to a certain temperature.
  • the wall of the reflector and the walls of the enclosure facing the cladding may be treated to minimize radiation emission, either by a mechanical treatment and / or a specific coating, as known in the art. field. It will be ensured that the thermal emissivity coefficient is less than 0.3 for the faces considered and for temperatures between 150 ° C and 300 ° C.
  • the heat generated by the heating resistors 32 is essentially reflected by the heat shield 20, or even partially absorbed by the metal strip 28 when it is present.
  • the confinement of air at above the vault of the enclosure, significantly limiting air movement, including the reduction of air intake assembly leaks, can significantly reduce the temperature of the cabinet 16 of the oven.
  • the latter being made of plastic, whose effusivity is much lower than that of steel, the contact temperature with the skin is considerably reduced, which further limits the risk of burns.
  • the thermal effusivity of the steel is of the order of 14000 W m 2 K -1 s 1/2 .
  • the PP has an effusivity of the order of 400 W m 2 K -1 s 1/2 , while that of the skin is close to 1800 W m 2 K -1 s 1/2 .
  • T T 1 ⁇ 1 + T two ⁇ two ⁇ 1 + ⁇ two
  • T 1 and ⁇ 1 are the temperature and the thermal effusivity of the solid 1 (respectively solid 2).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
  • Glass Compositions (AREA)
  • Surgical Instruments (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Vending Machines For Individual Products (AREA)
  • Disintegrating Or Milling (AREA)

Claims (11)

  1. Elektrohaushaltsbackofen (1) mit einem von zwei Seitenflächen (4a, 4b), einer Gewölbefläche (4c), einer Sohlenfläche (4e) und einer Rückseitenfläche (4d) begrenzten Garraum, mit Hauptheizmitteln (32) vom strahlenden Typ, die im Wesentlichen im Infrarot ausstrahlen und im Garraum (2) angeordnet sind, wobei der Backofen (1) eine Verkleidung (16) aufweist, die den Garraum (2) zum größten Teil an den Seitenflächen (4a, 4b) und der Gewölbefläche (4c) umgibt, wobei die Frontseite des Backofens mit einer Tür und einem Bedienfeld ausgestattet ist, wobei der Backofen (1) Mittel aufweist, die das Erhitzen der Verkleidung (16) begrenzen, dadurch gekennzeichnet, dass diese Mittel eine Einschließung durch Abschottung des Raums umfassen, der das Gewölbe (4c) des Garraums (2) vom oberen Teil (18c) der Verkleidung (16) trennt, und dass die Verkleidung (16) keine Belüftungsöffnung aufweist.
  2. Elektrohaushaltsbackofen (1) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die Verkleidung (16) auch den größten Teil der Rückseite (4d) des Garraums (2) abdeckt.
  3. Elektrohaushaltsbackofen (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Gewölbefläche (4c) des Garraums (2) einen Rand (14) aufweist, der zur Einschließung des Raums beiträgt, der das Gewölbe (4c) von der Verkleidung (16) trennt.
  4. Elektrohaushaltsbackofen (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine thermische Abschirmung (20) im Einschließungsraum zwischen dem oberen Teil der Verkleidung (18c) und dem Gewölbe (4c) des Garraums (2) angeordnet ist.
  5. Elektrohaushaltsbackofen (1) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die thermische Abschirmung (20) mindestens die ganze Fläche des Gewölbes (4c) des Garraums (2) abdeckt.
  6. Elektrohaushaltsbackofen (1) nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, dass die thermische Abschirmung (20) vertikale, nach unten geneigte Wände (22a, 22b, 22c, 22d) aufweist, die sich auf der Höhe der Seitenwände (22a, 22b) und der Rückseite (22d) bis zur Verkleidung (16) des Backofens erstrecken.
  7. Elektrohaushaltsbackofen (1) nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass ein Steg (24) aus schwach wärmeleitendem Material im Wesentlichen in der Mitte der Abschirmung (20) angeordnet ist und sich auf der einen und anderen Seite der Abschirmung senkrecht zu dieser einerseits bis in die Nähe des Gewölbes (4c) des Garraums (2) und andererseits bis zur Verkleidung erstreckt.
  8. Elektrohaushaltsbackofen (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Metallband (28) im Wesentlichen lotrecht zur Tür auf mindestens der Länge der Garraums (2) angeordnet ist, wobei das Band (28) mit der Verkleidung (16) über einen Isolierring (30) verbunden ist.
  9. Elektrohaushaltsbackofen (1) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der Isolierring (30) aus einem hitzebeständigen Kunststoff wie PBT besteht.
  10. Elektrohaushaltsbackofen (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verkleidung (16) aus einem thermoplastischen Kunststoff wie PP besteht.
  11. Elektrohaushaltsbackofen (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Metallband (28) dünne Öffnungen aufweist.
EP03715064A 2002-01-30 2003-01-29 Elektroherd Expired - Lifetime EP1470371B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0201101A FR2835310B1 (fr) 2002-01-30 2002-01-30 Four electromenager
FR0201101 2002-01-30
PCT/FR2003/000272 WO2003064930A1 (fr) 2002-01-30 2003-01-29 Four electromenager

Publications (2)

Publication Number Publication Date
EP1470371A1 EP1470371A1 (de) 2004-10-27
EP1470371B1 true EP1470371B1 (de) 2006-11-08

Family

ID=27619754

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03715064A Expired - Lifetime EP1470371B1 (de) 2002-01-30 2003-01-29 Elektroherd

Country Status (8)

Country Link
US (1) US20050072770A1 (de)
EP (1) EP1470371B1 (de)
AT (1) ATE344909T1 (de)
DE (1) DE60309563T2 (de)
ES (1) ES2272964T3 (de)
FR (1) FR2835310B1 (de)
RU (1) RU2003131891A (de)
WO (1) WO2003064930A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080145595A1 (en) * 2006-12-14 2008-06-19 Pratt Charles F Composite pedestal base assembly
TR200910136A2 (tr) * 2009-12-31 2011-07-21 Bsh Ev Aletleri̇ San. Ve Ti̇c. A.Ş. Pişirme cihazları için tasarlanmış ısı kalkanı tertibatı
CN112656244B (zh) * 2020-12-25 2022-07-08 浙江大坤电器科技有限公司 一种集成灶用烤箱内胆及其安装方法

Family Cites Families (16)

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Publication number Priority date Publication date Assignee Title
US3215816A (en) * 1962-03-20 1965-11-02 Tappan Co Oven
US3313917A (en) * 1963-11-21 1967-04-11 Litton Prec Products Inc Doorless infrared oven
US3626155A (en) * 1970-11-30 1971-12-07 Irex Corp Electric oven
JPS4881142A (de) * 1972-01-31 1973-10-30
US4238669A (en) * 1978-04-03 1980-12-09 Huntley James H Oven having dual heating means
US4829158A (en) * 1988-01-06 1989-05-09 Sunbeam Corporation Portable electric oven utilizing recirculating high speed air for cooking
US5620624A (en) * 1988-05-19 1997-04-15 Quadlux, Inc. Cooking method and apparatus controlling cooking cycle
DE4105845C1 (de) * 1991-02-25 1992-09-24 Heraeus Kulzer Gmbh, 6450 Hanau, De
US5215073A (en) * 1992-05-29 1993-06-01 General Electric Company Insulation system for domestic ranges
FR2732097B1 (fr) 1995-03-24 1997-05-23 Seb Sa Porte de four simplifiee avec module amovible
US6114664A (en) * 1998-07-08 2000-09-05 Amana Company, L.P. Oven with combined convection and low mass, high power density heating
DE19842247A1 (de) * 1998-09-15 2000-03-16 Bsh Bosch Siemens Hausgeraete Backofenmuffel mit thermischer Isolierung
US6204482B1 (en) * 1999-05-22 2001-03-20 American Permanent Ware Company Method and apparatus for cooling the exterior of a toaster oven
US6444954B1 (en) * 1999-11-10 2002-09-03 Hamilton Beach/Proctor-Silex, Inc. Toaster ovens
US6288369B1 (en) * 2000-12-15 2001-09-11 Victor L. Sherman Cooking apparatus
KR100556504B1 (ko) * 2002-12-18 2006-03-03 엘지전자 주식회사 전기 오븐 레인지의 안전 장치

Also Published As

Publication number Publication date
RU2003131891A (ru) 2005-03-27
FR2835310B1 (fr) 2004-05-28
FR2835310A1 (fr) 2003-08-01
WO2003064930A1 (fr) 2003-08-07
ATE344909T1 (de) 2006-11-15
ES2272964T3 (es) 2007-05-01
US20050072770A1 (en) 2005-04-07
EP1470371A1 (de) 2004-10-27
DE60309563T2 (de) 2007-09-13
DE60309563D1 (de) 2006-12-21

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