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EP2060854B1 - Backofen mit verbesserter Heizanordnung - Google Patents

Backofen mit verbesserter Heizanordnung Download PDF

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Publication number
EP2060854B1
EP2060854B1 EP20070120942 EP07120942A EP2060854B1 EP 2060854 B1 EP2060854 B1 EP 2060854B1 EP 20070120942 EP20070120942 EP 20070120942 EP 07120942 A EP07120942 A EP 07120942A EP 2060854 B1 EP2060854 B1 EP 2060854B1
Authority
EP
European Patent Office
Prior art keywords
heating element
side portions
central portion
cooking oven
oven according
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.)
Ceased
Application number
EP20070120942
Other languages
English (en)
French (fr)
Other versions
EP2060854A1 (de
Inventor
Elvina Whirlpool Europe s.r.l. Finzi
Francesco Whirlpool Europe s.r.l. Farachi
Magnus A. Whirlpool Europe s.r.l. Juurikivi
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.)
Whirlpool Corp
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Whirlpool Corp
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Filing date
Publication date
Application filed by Whirlpool Corp filed Critical Whirlpool Corp
Priority to EP20070120942 priority Critical patent/EP2060854B1/de
Priority to ES07120942T priority patent/ES2379493T3/es
Publication of EP2060854A1 publication Critical patent/EP2060854A1/de
Application granted granted Critical
Publication of EP2060854B1 publication Critical patent/EP2060854B1/de
Ceased 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
    • F24C15/32—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 cooking oven with the characteristics of the preamble of claim 1.
  • Convection ovens comprising electrical heating elements and a fan to circulate hot air within an oven cavity or cooking chamber are known in the art.
  • US 2006/0027560 A1 discloses a cooking oven comprising an oven cavity equipped with upper and lower electric heaters and with a convection fan on the rear plate of the oven cavity to circulate hot air through the oven cavity.
  • the function of the convection fan is to keep the temperature in the oven cavity uniform.
  • No heating element associated directly with the convection fan or mounted in the vicinity thereof is disclosed.
  • US-A-20060272632 describes an airflow system for a convection oven comprising an air baffle presenting a rectangular shape and flow restrictions near the outlets for creating turbulence and, in combination with angled louvers, for redirecting the airflow along to a perpendicular direction. This document discloses the features of the preamble of claim 1.
  • DE-A198-31087 describes an air baffle for circulating air into an oven cavity.
  • the air baffle is provided with suction openings disposed in a central angled portion, and side outlet openings at different heights.
  • the baffle is designed for being coupled with an air heater encircles the blower rotor.
  • the baffle is designed to alternate turbulent and laminar air flows.
  • JP-A-58200935 describes a convection oven provided with a heating element surrounding a blower, provided with a central curved portion and elongated side portions.
  • the blower is located centrally on the back-wall of the oven cavity.
  • a rectangular cover extends over the entire back-wall.
  • US 6,872,926 B1 discloses a rapid cook oven with dual flow fan assembly comprising an oven air inlet, a fresh air inlet, a mixing chamber, and a combustion chamber in which an electric heating element is housed.
  • the heating element is a coiled wire that takes the form of a halo disposed about the periphery of a dual flow fan within the combustion chamber. Air discharge ports are provided at the bottom and upper portions of fan assembly.
  • the "halo" shape of the heating element disclosed in this document is such that heat is generated in a restricted zone of the combustion chamber, which makes difficult an efficient heat removal and precise control of the temperature of the cooking chamber over a wide temperature range.
  • said heating assembly has a butterfly-like shape, with a circular central portion and wing-like side portions extending from said central portion with respect to a central longitudinal axis.
  • said restrictions of side portions of said baffle are asymmetrical with respect to a longitudinal axis extending through the centre of said baffle.
  • a convection cooking chamber 10 of a cooking oven is schematically represented without front wall or front door.
  • a heating assembly generally designated with 14 is mounted on rear vertical wall 12 of chamber 10.
  • Heating assembly 14 comprises a baffle 16, behind which a fan (not shown) and at least an electrical heating element are located, as it will be discussed in the following description and shown in Figures 2-5 .
  • Baffle 16 is provided with air inlets 18 and air outlets 19, 19', in communication with cooking chamber 10. The combination of a fan and one or more electrical heating elements generates a forced flow of air from chamber 10 into assembly 14 and then back to chamber 10, whereby air re-introduced into chamber 10 is heated.
  • FIG. 2 shows a first embodiment of an electrical heating element according to the invention.
  • an electrical heating element 20 includes a curved central portion 22 having approximately a semi-circular shape, and two elongated and curved side portions 24, 26, extending laterally from said central portion 22.
  • the overall shape of element 20 is that of a serpentine with a larger central loop and smaller side loops.
  • End plates 23, 25 of heating element 20 are fixed to rear wall 12 of cooking chamber 10, to provide mechanical support and allow electrical connection to element 22.
  • heating element 20 When mounted on wall 12 of the cooking chamber, heating element 20 is associated to a fan, not shown, which is located in the area defined by the central loop, so that curved central portion 22 follows the outline of the corresponding portion of said fan, so that air sucked by the fan from the cooking chamber is directed first toward the central portion 22 of heating element 20, then toward side portions 24, 26, to maximise heat exchange.
  • the centre of the fan is also the centre of curved portion 22.
  • Fig. 3 shows a second embodiment of an electrical heating element according to the invention.
  • an electrical heating element 30 results from combining two elements 20 in a mirror-like fashion to form a closed structure consisting of a single elongated heating element whose ends are connected to one end plate 33.
  • the structure of heating element 30 includes a curved central portion 32 having approximately a circular shape and two elongated and curved side portions 34, 36, with narrow bends, extending laterally from central body.
  • the overall shape of element 30 is that of a butterfly with a large circular central body and smaller wings.
  • Plate 33 located in portion 34 of the heating element is fixed to rear wall 12 of cooking chamber 10, to provide mechanical support and allow for electrical connection to element 30. Bracket 35, 35' support side portion 36 of heating element 30.
  • Fig. 3A shows an alternative implementation of the heating element described in Fig. 3 .
  • an electrical heating element 30 results from combining two elements 20A, 20B in a mirror-like fashion to form a single structure consisting of an elongated heating element 30 whose ends are connected to two end plates 33A and 33B.
  • the overall shape of element 30 is that of a butterfly with a large circular central body and smaller wings. Plates 33A and 33B, located in portions 34 and 36 of the heating element, are fixed to the rear wall 12 of cooking chamber 10, to provide mechanical support and allow for electrical connection to element 30.
  • Each of the single heating elements 20A, 20B can be dimensioned to supply either the same or different power of the mirrored element (respectively 20B and 20A) or, driven to supply different power levels according to the heating performances that need to be obtained in the oven cavity 10.
  • Each of the single heating elements 20A, 20B can be activated separately or jointly with the mirrored element, respectively 20B or 20A, for a better control of the heating power and consequently of the temperature into the oven cavity.
  • heating element 30 When mounted on wall 12 of the cooking chamber, heating element 30 is associated to a fan, not shown, which is located in the area defmed by central body of the butterfly, so that curved central portion 32 follows the outline of said fan. Therefore, air sucked from the cooking chamber is directed first toward heating element 30, then to side portions 34, 36, to maximise heat exchange.
  • the centre of the fan is also the centre of curved portion 32.
  • a traditional tubular heating element provided with circular shape can be combined with the butterfly shaped element 30.
  • FIG. 4 and 5 show a third embodiment of an electrical heating element according to the invention.
  • an electrical heating element 40 results from combining a butterfly heating element with a ring 42, to form to a single-wire structure.
  • the butterfly part of heating element 40 comprises two elongated and curved side portions 44, 46, extending laterally from said central ring-portion 42 like the wings of a butterfly.
  • a plate 43 located in the central ring portion 42 of the heating element is fixed to rear wall 12 of cooking chamber 10, to provide mechanical support and allow for electrical connection to element 40.
  • Bracket 45, 45', 45" provide support to side portions 44, 46 and central portion 42 of heating element 40, respectively.
  • heating element 40 When mounted on wall 12 of the cooking chamber, heating element 40 is associated to a fan, not shown, which is located in the area defined by central ring-portion, so that central ring-portion 42 follows the outline of said fan. Therefore, air sucked from the cooking chamber is directed toward heating element 40, to maximise heat exchange.
  • the centre of the fan is also the centre of central ring-portion 42.
  • heating elements 20, 20A, 20B, 30, or 40 are electrical heating elements consisting of a tubular resistive material.
  • FIGS. 6-9 show an embodiment of a baffle designated generally with 16, which has the also the function to protect the heating element and the fan described above from particles of food, oil and the like present in the cooking chamber.
  • Baffle 16 is fixed to rear wall 12 of a cooking chamber 10 by fastening means such as screws (not shown) housed in holes 51 of a back plate portion 50.
  • Baffle 16 is shaped with a large portion raised from back plate portion 50, whose height is shown in particular in Fig. 7 and 8 , and that allows to house the fan and the heating element described above.
  • the raised portion has approximately a butterfly shape, and comprises a substantially circular central portion 52 and side portions 54, 56, formed with restrictions 53, 55 in the vicinity of central portion 52.
  • the overall shape of the raised portion of baffle 16 is that of a butterfly, with wings that widen from restrictions 53, 55 to external ends 57, 59.
  • Central portion 52 is designed to be operatively located over the fan and the central portion of the heating element described above in connection to Figures 2-5 .
  • Side portions 54, 56 of baffle 16 are designed to be located over the corresponding side portions 24, 26 of heating element 20; or the corresponding side portions 34, 36 of heating element 30; or the corresponding side portions 44, 46 of heating element 40.
  • Central portion 52 of baffle 16 is provided with air inlets 18, and side portions 54, 56 of baffle 16 are provided with air outlets 19, 19', located on said widened external ends 57, 59 of side portions 54, 56. Further, air outlets 60 are provided also in the peripheral edge of central portion 52.
  • restrictions 53, 55, of side portions 54, 56 join central portion 52, whose size is larger than that of restrictions 53, 55, with a profile that is asymmetrical with respect to a longitudinal axis Y extending through the centre of baffle 16.
  • restriction 53 of side portion 54 has a lower profile 53a substantially circular, and an upper profile 53b substantially linear.
  • restriction 55 of side portion 56 has a lower profile 55a substantially linear, and an upper profile 55b substantially circular.
  • heating assembly 14 is to generate a forced flow of air from chamber 10 into assembly 14 through holes 18 and then back to chamber 14 through holes 19, 19', whereby air re-introduced into chamber 10 is heated.
  • baffle 16 encircling heating element 20 or 30 or 40, or two associated but separate elements 20, is such that air is effectively circulated within assembly 14 from holes 18 to holes 19, 19'.
  • This feature allows to use heating elements of considerable length, which extends with elongated side portions from a central portion, thanks to their curved or serpentine shape.
  • the relative position of fan and heating elements and the superimposed position of baffle 16 is such that incoming air flows over the full extension of the heating element, which favours heat exchange.
  • restrictions 53, 55 of side portions define zones between baffle 16 and the rear wall 12 of the cooking chamber in which air flow is redirected to be distributed evenly, thereby avoiding unevenness in air velocity and allowing a more uniformly distributed heat exchange.
  • restrictions 53, 55 of side portions 54, 56 helps to optimize the air flow distribution since, on one side air is delivered to a zone in which the profile is linear and does not oppose obstacles to flow and, on the other side air flow, following the curvilinear profile, doesn't allow the air flow boundary layer to detach from the baffle wall, and consequently air is also distributed in the portion of the baffle next to the curvilinear profile, otherwise not possible.
  • the combination of restrictions 53, 55 and asymmetry of their profiles is highly effective in generating a forced air flow evenly distributed which maximizes heat exchange, thereby maximizing heating of the cooking chamber of the oven.
  • heating elements of different length and power helps to controlling the amount and speed of heating of the cooking chamber.
  • a single heating element like element 20, 20A, 20B can typically supply a power up to 700 W.
  • Elements like 30 or 40 can typically supply a power up to 2800 W.
  • the convection cooking oven according to the invention is thus capable to provide efficient and effective cooking of food items, combined with high versatility with respect to choice of desired power of the heating element.

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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)

Claims (15)

  1. Kochherd, umfassend einen Konvektionsgarraum (10), in dem eine Heizanordnung (14) montiert ist, wobei die Heizanordnung eine Ablenkplatte (16), ein Gebläse und mindestens ein elektrisches Heizelement (20; 20A; 20B; 30; 40) umfasst, wobei die Ablenkplatte (16) mit Lufteintrittsöffnungen (18) und Luftaustrittsöffnungen (19, 19') versehen ist, die mit dem Garraum (10) in Verbindung stehen;
    wobei das mindestens eine elektrische Heizelement (20; 20A; 20B; 30; 40) einen gekrümmten mittleren Abschnitt (22; 32; 42) und längliche Seitenabschnitte (24, 26; 34, 36; 44, 46), die sich von dem mittleren Abschnitt aus erstrecken, umfasst;
    wobei die Ablenkplatte (16) einen mittleren Abschnitt (52), der sich über dem Gebläse und dem mittleren Abschnitt (22; 32; 42) des mindestens einen elektrischen Heizelements (20; 20A; 30; 40) befindet, und Seitenabschnitte (54, 56), die sich über den länglichen Seitenabschnitten (24, 26; 34, 36; 44, 46) des mindestens einen elektrischen Heizelements (20; 20A; 30; 40) befinden, umfasst;
    wobei die Lufteintrittsöffnungen (18) in dem mittleren Abschnitt (52) der Ablenkplatte (16) bereitgestellt werden und die Luftaustrittsöffnungen (19, 19') in den Seitenabschnitten (54, 56) der Ablenkplatte (16) bereitgestellt werden;
    wodurch eine Umluftströmung von den Lufteintrittsöffnungen (18) zu den Luftaustrittsöffnungen (19, 19') erzeugt wird, um betriebsmäßig Wärme aus den mittleren (22; 32; 42) und seitlichen (24, 26; 34, 36; 44, 46) Abschnitten des Heizelements (20; 30; 40) zu entfernen, dadurch gekennzeichnet, dass die Seitenabschnitte (54, 56) der Ablenkplatte (16) mit Begrenzungen (53, 55) in der Nähe des mittleren Abschnitts (52) gebildet sind.
  2. Kochherd nach Anspruch 1, dadurch gekennzeichnet, dass die Ablenkplatte (16) der Heizanordnung (14) eine schmetterlingsartige Form aufweist, wobei sich ein im Wesentlichen kreisförmiger mittlerer Abschnitt (52) und flügelartige Seitenabschnitte (54, 56) von den Begrenzungen (53, 55) zu den erweiterten externen Enden (57, 59) erstrecken.
  3. Kochherd nach Anspruch 1, dadurch gekennzeichnet, dass der gekrümmte mittlere Abschnitt (22) des mindestens einen elektrischen Heizelements (20, 20A, 20B) eine im Wesentlichen halbkreisförmige Form aufweist.
  4. Kochherd nach Anspruch 1, dadurch gekennzeichnet, dass die Seitenabschnitte (24, 26) gekrümmt sind und sich seitlich von dem mittleren Abschnitt (22) des mindestens einen elektrischen Heizelements (20, 20A, 20B) erstrecken und mit Anschlussplatten (23, 25, 33A, 33B) versehen sind, von denen sich jede auf einer Seite des mittleren Abschnitts (22) befindet.
  5. Kochherd nach Anspruch 1, dadurch gekennzeichnet, dass der mittlere Abschnitt (32) des mindestens einen elektrischen Heizelements (30) im Wesentlichen kreisförmig ist.
  6. Kochherd nach Anspruch 1, dadurch gekennzeichnet, dass der mittlere Abschnitt des mindestens einen elektrischen Heizelements (40) einen Ring (42) umfasst und die Seitenabschnitte (44, 46) gekrümmt sind und sich seitlich von dem Ring (42) erstrecken.
  7. Kochherd nach Anspruch 1, dadurch gekennzeichnet, dass die Begrenzungen (53, 55) der Seitenabschnitte (54, 56) im Verhältnis zu einer Längsachse (Y), die sich durch die Mitte der Ablenkplatte (16) erstreckt, asymmetrisch sind.
  8. Kochherd nach Anspruch 2, dadurch gekennzeichnet, dass sich die Luftaustrittsöffnungen (19, 19') an den erweiterten externen Enden (57, 59) der Ablenkplatte (16) befinden.
  9. Kochherd nach Anspruch 3, dadurch gekennzeichnet, dass der gekrümmte mittlere Abschnitt mit einer im Wesentlichen halbkreisförmigen Form (22) des mindestens einen elektrischen Heizelements (20, 20A, 20B) koaxial zu dem Gebläse innerhalb der Heizanordnung (14) montiert ist.
  10. Kochherd nach Anspruch 5, dadurch gekennzeichnet, dass die Gesamtform des mindestens einen elektrischen Heizelements (30) im Wesentlichen die eines Schmetterlings ist, wobei sich die schmalen Krümmungen der Seitenabschnitte (34, 36) seitlich von dem mittleren Abschnitt (32) wie Schmetterlingsflügel erstrecken.
  11. Kochherd nach Anspruch 6, dadurch gekennzeichnet, dass die Enden des mindestens einen Heizelements (40) mit einer Anschlussplatte (43) versehen sind und entsprechend dem mittleren Ring (42) des mindestens einen elektrischen Heizelements (40) nahe aneinander liegen.
  12. Kochherd nach Anspruch 10, dadurch gekennzeichnet, dass die Enden der Seitenabschnitte (34, 36) gekrümmt sind und mit einer Anschlussplatte (33) versehen sind und auf einer Seite des mindestens einen elektrischen Heizelements (30) nahe aneinander liegen.
  13. Kochherd nach Anspruch 7, dadurch gekennzeichnet, dass das untere Profil (53a) einer Begrenzung (53) eines (54) der Seitenabschnitte (54, 56) im Wesentlichen kreisförmig ist, und das untere Profil (55a) der gegenüberliegenden Begrenzung (55) der Seitenabschnitte (54, 56) im Wesentlichen linear ist.
  14. Kochherd nach Anspruch 7, dadurch gekennzeichnet, dass das obere Profil (53b) einer Begrenzung (53) eines (54) der Seitenabschnitte (54, 56) im Wesentlichen linear ist, und das obere Profil (55b) der gegenüberliegenden Begrenzung (55) der Seitenabschnitte (54, 56) im Wesentlichen kreisförmig ist.
  15. Kochherd nach Anspruch 7, 13, 14, dadurch gekennzeichnet, dass das untere Profil (53a) der Begrenzung (53) eines der Seitenabschnitte (54) im Wesentlichen kreisförmig ist, das untere Profil (55a) der gegenüberliegenden Begrenzung (55) der Seitenabschnitte im Wesentlichen linear ist, wobei das obere Profil (53b) der Begrenzung (53) im Wesentlichen linear ist und das obere Profil (55b) der gegenüberliegenden Begrenzung (55) im Wesentlichen kreisförmig ist, wodurch die Luftströmung in einer vorherbestimmten Richtung (A, A') abgegeben wird.
EP20070120942 2007-11-19 2007-11-19 Backofen mit verbesserter Heizanordnung Ceased EP2060854B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20070120942 EP2060854B1 (de) 2007-11-19 2007-11-19 Backofen mit verbesserter Heizanordnung
ES07120942T ES2379493T3 (es) 2007-11-19 2007-11-19 Horno de cocina con conjunto de calentamiento mejorado

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070120942 EP2060854B1 (de) 2007-11-19 2007-11-19 Backofen mit verbesserter Heizanordnung

Publications (2)

Publication Number Publication Date
EP2060854A1 EP2060854A1 (de) 2009-05-20
EP2060854B1 true EP2060854B1 (de) 2012-02-01

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EP20070120942 Ceased EP2060854B1 (de) 2007-11-19 2007-11-19 Backofen mit verbesserter Heizanordnung

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EP (1) EP2060854B1 (de)
ES (1) ES2379493T3 (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

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Publication number Priority date Publication date Assignee Title
US10415836B2 (en) * 2015-02-06 2019-09-17 Michael James McIntyre Cooking apparatus and air delivery and circulation device therefore
EP3620722B1 (de) * 2018-09-04 2023-01-25 Whirlpool Corporation Umluftofen mit gasbeheizung
USD1033127S1 (en) 2022-02-02 2024-07-02 Whirlpool Corporation Circulation cover for a convection oven
US20230243519A1 (en) * 2022-02-02 2023-08-03 Whirlpool Corporation System and method for improved convection airflow in a cooking appliance

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Also Published As

Publication number Publication date
ES2379493T3 (es) 2012-04-26
EP2060854A1 (de) 2009-05-20

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