EP1559959B1 - Backofen mit einer Heizungs / Lüfter - Baueinheit - Google Patents

Backofen mit einer Heizungs / Lüfter - Baueinheit Download PDF

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Publication number
EP1559959B1
EP1559959B1 EP04380262A EP04380262A EP1559959B1 EP 1559959 B1 EP1559959 B1 EP 1559959B1 EP 04380262 A EP04380262 A EP 04380262A EP 04380262 A EP04380262 A EP 04380262A EP 1559959 B1 EP1559959 B1 EP 1559959B1
Authority
EP
European Patent Office
Prior art keywords
rear wall
panel
heater
fan
chamber
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
EP04380262A
Other languages
English (en)
French (fr)
Other versions
EP1559959A2 (de
EP1559959A3 (de
Inventor
Daniel De Los Toyos
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.)
Eika SCL
Original Assignee
Eika SCL
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 Eika SCL filed Critical Eika SCL
Publication of EP1559959A2 publication Critical patent/EP1559959A2/de
Publication of EP1559959A3 publication Critical patent/EP1559959A3/de
Application granted granted Critical
Publication of EP1559959B1 publication Critical patent/EP1559959B1/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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/06—Arrangement or mounting of electric heating elements
    • 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
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F24C15/325—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation electrically-heated

Definitions

  • the present invention relates to a domestic baking oven incorporating a convection assembly with an electric heater, which is provided with a flat support for the electric heater resistor assembled in combination with an air fan for the heat distribution in the baking chamber.
  • Domestic baking ovens fitted with an electric heater assembly in the baking chamber, of the type for the convection of the heat generated by a circular-shaped electrical heating resistor, which is associated with a fan mounted at the centre of the rear wall of the chamber, are already known.
  • the fan distributes the air heated by the resistor all round the baking chamber, for which purpose additional walls in the chamber form a cooled air intake duct towards the resistor and one or more ducts for impelling the air heated in its flow towards the chamber by the resistor.
  • heater assemblies are fitted in the oven chamber by means of the separate individual fixing of component of the heater assembly, the fan, the resistor and its electrical connector, a support bracket for the resistor insulated electrically from the metallic casing of the oven, and the additional walls forming the forced air ducts.
  • this type of baking oven are those disclosed in WO-02/39021-A1 , EP-319373-A1 and in GB 1598333 A .
  • a domestic baking oven that incorporates a forced air heater, as that disclosed in EP-852317-A1 , whose electrical heating resistor is the type with a thick film deposited on several flat panels, which are arranged in the baking chamber in front of the convector fan and, in addition, form the forced hot air flow delivering and distribution ducts.
  • This construction of the convection ducts needs various flat supports for the resistors, which have to be installed in a succession in the oven carrying out a mounting operation separate from that of the fan.
  • the components comprised in the convection heater are supplied separately for assembly of the oven, being further fixed individually to the metal structure of the oven, and special means are required for fixing each component, such as for the fan and the resistor panels as well as for the electrical connectors.
  • the object of the present invention is a domestic baking oven according to claim 1.
  • the heater assembly according to the invention is formed as a separate supply unit, including the convection fan, one or more flat resistors in thermal contact with a panel supporting the resistors which is traversed by the air flow generated from the baking chamber by the fan, and the electrical connection means, so that for its installation it is handled as a single sub-assembly separate from the oven structure, which permits its installation in different domestic baking oven models by means of a single connection device between the fan and the heater panel, which in turn acts as a support for the single heater assembly, fixed directly to the rear wall of the chamber by means of quick-fixing accessories and without the use of additional walls for forming the forced hot air flow force and distribution ducts.
  • the heater assembly of the invention has the advantage of being provided with a single resistor substrate-panel, which is completely flat and economical to manufacture, besides providing efficient heating as the circulating air is heated against the two opposing faces of the flat substrate-panel.
  • one embodiment of the baking oven 1 comprises a baking chamber 3 formed by means of a vertical rear oven wall 2 and a number of adjacent metallic walls 2a, and a heater assembly 4 fixed on said rear wall 2 in order to generate a flow of forced hot air distributed all round chamber 3.
  • the heater assembly 4 comprises a radial blade fan 8 driven by a motor 9 a rotary fan shaft 10 forcing the hot air delivery flow 6, a heater support panel 11, 12 in the form of a flat plate with two sides, a front one 11a and a rear one 11b, bearing on one of them a flat heating resistor 12 in thermal contact with the respective face 11a, 11b, and a single connecting and support device 7 fixed to the rear wall 2, all of them installed as a single sub-assembly 7-12, including the means for electrical connection 16 as well.
  • the heater panel 11, 12 carrying the heating resistor 12 is preferably structured as a substantially flat substrate strip 11, on either the front face 11a or rear face 11b of which there is placed in thermal contact a flat resistor or preferably deposited a thick film heating resistor 12, in order to improved thermal transmission to the substrate-panel 11, which is made of a metal sheet coated with an electrical insulating layer which is at the same time a good thermal conductor.
  • the heater assembly 4 is mounted on the rear wall 2 of the oven solely by means of the connecting device 7, which is fixed directly to the rear wall 2 of the chamber by means of screws or quick-fastening accessories of the turn-and-lock type, not shown in the drawings.
  • the connecting device 7 is made up of a circular central plate 7a which is placed in contact with the rear wall 2, and from its periphery there project a number of radial arms 13 extended in the form of a funnel widening in the direction of the chamber 3, leaving air flow openings 14 between them.
  • the central plate 7a is crossed by the rotary shaft 10 of the fan securing it, for purposes of supporting the fan 8 and its motor 9 in the heater assembly.
  • the substrate-panel 11 carrying the heating resistor 12 is substantially ring-shaped with an outside diameter referred to in figure 1 as "De", and it is made of a metal sheet, such as of stainless steel having a high strength for coupling to the connecting device 7.
  • the annular substrate 11 has a central opening 11c with a diameter "D1" on the edge of which it is supported, connected to the radial arm ends 13a of said coupling device 7, the substrate 11 positioned on a plane parallel to that of rotation of the blades 8 and separated from the rear wall 2 by a space of width "W".
  • the length of the fan shaft 10 crossing the space "W" determines an equivalent separation distance between the plane of the blades 8 and the rear wall 2.
  • the force flow ducts for a part of the hot air flow supply which is first directed at the baking chamber 3 by way of the hollows 14 between two radial support arms 13, on the rear face 11b of the heating panel 11,12, and then distributed by way of the peripheral space between the heater assembly 4 and the adjacent walls 2a of the oven.
  • the circular periphery of the rotary blades 8 is substantially interposed inside the heater panel 11,12, so that a portion of the hot air flow 6 is due to the central intake air flow 5 sucked by the fan 8, which runs over the front face 11a of the heater panel.
  • the heater assembly 4 is installed as a single supply sub-assembly on the rear wall 2 of the oven by means of a single operation for fitting the whole heater assembly 4, including the fan motor 9 and its thermal insulation from the oven walls.
  • the opening 15 in the rear wall 2 required for this operation has a diameter larger than the diameter "Dm" of motor 9.
  • the central support plate 7a has a diameter "Ds" larger than the through-hole opening 15 in the wall, so it is placed in contact with the rear wall 2 internally.
  • the electrical connection cables 16 of the heating resistor are run to the outside of the oven by way of the intermediate space "W", guided on the radial arms 13 of the support, thus terminating the heater assembly 4 installation operation in the chamber 3 of the oven.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Baking, Grill, Roasting (AREA)
  • Electric Stoves And Ranges (AREA)
  • Electric Ovens (AREA)

Claims (6)

  1. Haushaltsbackofen, ausgestattet mit einer elektrischen Heizanordnung (4) zum Beheizen der Ofenkammer (3), von Art, welche die Konvektion eines warmen Luftstroms (6) verwendet, der anhand eines flachen elektrischen Widerstands (12) generiert wird, wobei der Backofen (1) eine Rückwand (2) und eine Reihe von angrenzenden Kammerwänden (2a), einen Konvektionsventilator (8, 9, 10), der einen Motor (9) und eine Drehwelle (10) aufweist, mindestens ein Feld (11) zum Tragen des Heizwiderstands (12), und Mittel (7a, 13a) zum Verbinden des Ventilators (8, 9, 10) und des mindestens einen Felds (11) mit den Wänden (2, 2a) aufweist, wobei ein heißer Luftstrom (6) umgewälzt und anhand eines Kanals, der aus den Wänden (2, 2a) und dem mindestens einen Feld (11) besteht, über die Ofenkammer (3) verteilt wird, wobei die Heizanordnung (4) mit einem einzigen Feld (11) zum Tragen des elektrischen Widerstands (12) versehen ist, der im Wesentlichen flach ist und parallel zu der Rückwand (2) angeordnet ist, wobei er davon um eine gegebene Abstandsbreite W getrennt ist, dadurch gekennzeichnet, dass der elektrische Widerstand (12) ringförmig ist, wobei der Konvektionsventilator (8, 9, 10) in der Mitte der Rückwand (2) montiert ist, die Heizanordnung (4) mit einer Vorrichtung (7) versehen ist, um sowohl den Ventilator (8) und seinen Motor (9) als auch das mindestens eine Feld (11) als einziges Trägermittel der Heizanordnung (4) an der Rückwand (2) zu koppeln, wodurch die Heizanordnung (4) als Baugruppe (7 bis 10) aufgebaut ist, die insgesamt in einem einzigen Arbeitsgang direkt an der Rückwand (2) der Kammer montiert werden kann.
  2. Backofen nach Anspruch 1, wobei die Vorrichtung (7) zum Koppeln und Tragen der Heizanordnung (4) mit einer mittleren Platte (7a), die an der Rückwand (2) der Kammer befestigt ist, und mit Mitteln (13, 14) zum Koppeln des mindestens einen Feldes (11) mit der mittleren Platte (7a), die von diesem um die Abstandsbreite "W" beabstandet ist, versehen ist, wodurch sie einen Kanal bilden, um einen Luftstrom zwischen der Rückwand (2) und dem mindestens einen Feld (11, 12) umzuwälzen.
  3. Backofen nach Anspruch 1, wobei die Vorrichtung (7), welche die Heizanordnung (4) koppelt und trägt, mit einer mittleren Platte (7a), die an der Rückwand (2) der Kammer befestigt ist, und mit einer gewissen Anzahl von radialen Armen (13), die sich in der Richtung der Kammer (3) erstrecken und das mindestens eine Feld (11, 12) tragen, das um die Abstandsbreite "W" von der Rückwand entfernt ist, versehen ist, wodurch ein Kanal gebildet wird, um den Luftstrom (6) zwischen der Rückwand (2) und dem mindestens einen Feld (11, 12) umzuwälzen.
  4. Backofen nach Anspruch 1, wobei das mindestens eine Feld (11, 12) eine mittlere Öffnung (11c) aufweist, in der die Drehebene der radialen Schaufeln des Konvektionsventilators (8) eingeschoben ist, getrennt von der Rückwand (2) durch seine Drehwelle (10), um den Luftstrom (6) gegen die beiden Seiten des mindestens einen Feldes (11, 12) umzuwälzen.
  5. Backofen nach Anspruch 1, wobei das mindestens eine Feld (11, 12) die Form einer flachen Platte annimmt, die mit einer mittleren Öffnung (11c) zum Einschieben der Drehschaufeln des Ventilators (8) und mit einem umlaufenden Rand (13a) zum Tragen derselben anhand der Vorrichtung (7) zum Koppeln der Heizanordnung versehen ist.
  6. Backofen nach Anspruch 1, wobei das mindestens eine Feld (11, 12), das den elektrischen Widerstand (12) trägt, die Form einer metallischen Substratfolie (11) mit zwei vorderen (11a) und hinteren (11 b) Heizflächen annimmt, und der elektrische Widerstand (12) von der Art ist, die einen dicken Film aufweist, der auf einer Oberfläche (11a, 11b) aufgetragen ist, und mit einer mittleren Öffnung (11c) in dem Heizsubstrat, in dem die Drehebene der Schaufeln des Ventilators (8) eingeschoben ist, so dass der Luftstrom (5, 6), der von dem Ventilator (8) erzeugt wird, auf den beiden Oberflächen (11a, 11b) der Substratfolie erhitzt wird.
EP04380262A 2004-01-30 2004-12-16 Backofen mit einer Heizungs / Lüfter - Baueinheit Expired - Lifetime EP1559959B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200400194A ES2242521B1 (es) 2004-01-30 2004-01-30 Horno de coccion domestico con un grupo calefactor de conveccion.
ES200400194P 2004-01-30

Publications (3)

Publication Number Publication Date
EP1559959A2 EP1559959A2 (de) 2005-08-03
EP1559959A3 EP1559959A3 (de) 2006-05-31
EP1559959B1 true EP1559959B1 (de) 2012-07-04

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Application Number Title Priority Date Filing Date
EP04380262A Expired - Lifetime EP1559959B1 (de) 2004-01-30 2004-12-16 Backofen mit einer Heizungs / Lüfter - Baueinheit

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EP (1) EP1559959B1 (de)
ES (2) ES2242521B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11852349B2 (en) 2021-03-11 2023-12-26 Electrolux Home Products, Inc. Convection heating element

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2008219092A1 (en) * 2007-02-20 2008-08-28 Thermoceramix Inc. Gas heating apparatus and methods
DE102009026645B4 (de) * 2009-06-02 2015-03-12 BSH Bosch und Siemens Hausgeräte GmbH Gargerät
ES2408508B1 (es) * 2011-10-25 2014-04-15 BSH Electrodomésticos España S.A. Dispositivo de aparato doméstico
CN111449095A (zh) * 2020-04-17 2020-07-28 杭州佐帕斯工业有限公司 一种大功率烤箱加热器

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3529582A (en) * 1968-12-09 1970-09-22 Gen Electric Self-cleaning forced convection oven
GB1598333A (en) * 1977-12-09 1981-09-16 Moffat R Electrical heating device for a food-containing unit
JPS6016244A (ja) * 1984-06-07 1985-01-28 Matsushita Electric Ind Co Ltd 加熱調理器
IT1220754B (it) * 1988-06-01 1990-06-21 Zanussi Grandi Impianti Spa Forno di cottura a gas a convezione forzata
US4928663A (en) * 1989-01-31 1990-05-29 Bakers Pride Oven Co. Enhanced air-flow convection oven
US5404420A (en) * 1993-08-10 1995-04-04 Song; Eugene Cooking oven using far-infrared tube heater
EP0852317B1 (de) * 1998-03-27 2003-10-29 Electrolux AG Backrohr mit einem Lufteinlass und einer Heizelementanordung
AU1367802A (en) * 2000-11-08 2002-05-21 Ron Wilson Domestic oven heating element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11852349B2 (en) 2021-03-11 2023-12-26 Electrolux Home Products, Inc. Convection heating element

Also Published As

Publication number Publication date
EP1559959A2 (de) 2005-08-03
ES2386281T3 (es) 2012-08-16
ES2242521B1 (es) 2006-10-01
ES2242521A1 (es) 2005-11-01
EP1559959A3 (de) 2006-05-31

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