EP4235039B1 - Küchenherd mit gegenläufigen ventilatoren - Google Patents

Küchenherd mit gegenläufigen ventilatoren

Info

Publication number
EP4235039B1
EP4235039B1 EP22425008.4A EP22425008A EP4235039B1 EP 4235039 B1 EP4235039 B1 EP 4235039B1 EP 22425008 A EP22425008 A EP 22425008A EP 4235039 B1 EP4235039 B1 EP 4235039B1
Authority
EP
European Patent Office
Prior art keywords
fans
outlet openings
kitchen oven
compartment
oven
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.)
Active
Application number
EP22425008.4A
Other languages
English (en)
French (fr)
Other versions
EP4235039A1 (de
Inventor
Auro Po
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.)
STEEL Srl
Original Assignee
Steel Srl
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 Steel Srl filed Critical Steel Srl
Priority to EP22425008.4A priority Critical patent/EP4235039B1/de
Publication of EP4235039A1 publication Critical patent/EP4235039A1/de
Application granted granted Critical
Publication of EP4235039B1 publication Critical patent/EP4235039B1/de
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
    • F24C15/32—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 the field of kitchen ovens of the type intended for cooking food, and in particular it relates to a cooking oven for domestic applications designed to allow cooking viands inserted in its cooking compartment.
  • the conventional oven cooks viands by irradiation, i.e. by letting the heat propagate without forcing air to move. Therefore, the conventional oven cooks more slowly and gradually.
  • ventilated ovens substantially meet the current needs of the sector, they can still be improved, in particular in terms of the homogeneous distribution of heat inside the oven compartment.
  • the Applicant has indeed made accurate measurements of the temperature reached in different points of the cooking compartment, thereby highlighting considerable differences even in double-fan ovens.
  • the Applicant hypothesized that such difficulties of uniform distribution of heat inside the oven depend on the parallelepiped geometry thereof, which is unlikely to be passed through in an uniform manner by the centrifugal motion with the same direction provided by the two - or more - fans. For this reason, in the peripheral areas of the oven the temperature is lower than that recorded in the central area.
  • the technical problem underlying the present invention is thus to produce a kitchen oven which solves the previously reported limits of the prior art, and in particular that can optimize the distribution of heat inside the oven, thereby allowing to reach a homogeneous temperature in every area of the oven.
  • the opposite motion of the two fans compensates for the flow asymmetries due to the direction of rotation.
  • the difference in extension between the inlet openings and the outlet openings produces an overpressure inside the ventilation compartment which causes a strong outlet flow, thereby conducting hot air so as to invade the cooking compartment in a homogeneous manner, diffusing heat even in the most peripheral areas.
  • the electrical resistor is entirely in an area between the two fans, preferably midway between the latter.
  • This expedient which differs from the typical use of a electrical resistor inside each fan, advantageously fits the proposed architecture thereby limiting the costs of production and operation, whilst ensuring the desired result of uniform heat distribution.
  • said electrical resistor has a circular shape and is centered on a parallel axis which is intermediate with respect to those of the two fans.
  • the electrical resistor may be slightly offset in the radial direction with respect to both fans.
  • said fans are horizontally aligned, or slightly offset from the horizontal.
  • alternative embodiments with overlapped or diagonally-arranged fans may be considered.
  • the two fans have blades which are shaped in an opposite manner, respectively designed for a clockwise and a counterclockwise direction.
  • the two fans are operated with speed of rotation equal to and between 1000 and 3000 rpm.
  • the speed of rotation is equal to 2000 rpm.
  • the fans have a diameter between 80 and 160 mm; more preferably equal to 120 mm.
  • the inlet openings may be entirely provided at each fan on the main face of the cover and define air inlet grids which directly face the fans.
  • said inlet grids may be embodied by a plurality of openings shaped as an arc of a circle which spread from a full center.
  • outlet openings are preferably located only at the perimeter of the cover. In other words, no outlet openings are provided at inner areas of the cover, and in particular in areas between the two fans. In this way, both fans contribute to the same air flow, and no differentiated circulations going to different portions of the cooking compartment are created.
  • the cover protrudes from the rear surface inside the cooking compartment and has a front main face and at least one perimetric edge, wherein the inlet openings are obtained on the main face and the outlet openings are obtained on the perimetric edge.
  • the outlet air flow is blown laterally towards the rear corners of the cooking compartment, and this may contribute to the whole volume of the compartment being passed through.
  • the outlet openings may be provided at least on two opposite lateral faces of the perimetric edge.
  • the outlet openings may be a plurality of holes linearly arranged along said lateral faces.
  • the holes may be slots longitudinally extended in the vertical direction, or they may be circular or of any other shape.
  • the outlet openings are equally distributed along the internal extension of the respective lateral face.
  • the outlet openings on the two opposite lateral faces are symmetrically arranged.
  • the motion of the left fan - as seen by an observer located in front of the oven - is counterclockwise, while the motion of the right fan is clockwise.
  • Such choice of the directions facilitates the homogeneous distribution, especially if it is combined with a grouping of the holes in the lower area.
  • the upper face of the perimetric edge is preferably free from openings.
  • the total surface of the inlet openings is between 2000 mm 2 and 4000 mm 2 , for example it is 3000 mm 2 .
  • the total surface of the outlet openings is between 1000 mm 2 and 3000 mm 2 , for example it is 2000 mm 2 .
  • the ratio of the surfaces of the inlet openings to those of the outlet openings is higher than 1 and equal to or lower than 2; again preferably, it is between 1.3 and 1.7. In a preferred embodiment, the ratio is 1.5: for example, as mentioned above, the surface of the inlet openings may be 3000 mm 2 and the surface of the outlet openings may be 2000 mm 2 .
  • the oven according to the present invention may further comprise a control unit, configured to simultaneously operate said fans in opposite directions of rotation.
  • the oven may also comprise, in a per se known manner, an electric thermostat which measures the temperature in at least one point inside the cooking compartment and sends in real time said piece of data to the control unit.
  • the control unit is operatively configured to control one or more cooking modes: in at least one of said cooking modes, the electrical resistor is activated and/or the two fans are operated in counter-rotation.
  • 100 generally identifies a kitchen oven according to the present invention.
  • kitchen oven is meant in particular in the present invention an oven intended for cooking or anyway for preparing food and viands, regardless of its industrial or domestic intended use.
  • domestic use is to be considered preferred and the specific embodiment described below refers thereto.
  • the kitchen oven as shown in Figure 2 , further has a muffle 1 provided with a cover 7 which divides a cooking compartment 2 from a rear ventilation compartment 10.
  • the overall kitchen oven 100 and the muffle 1 are illustrated in the figures in their normal configuration of use.
  • the relative and absolute positions and the orientations of the various elements which form the oven defined by means of terms such as “upper” and “lower”, “above” and “below”, “horizontal” and “vertical” or other equivalent terms, must always be interpreted with reference to this configuration.
  • Other terms, such as “front” and “rear”, “right” or “left”, “clockwise” or “counterclockwise” are to be interpreted from the viewpoint of a user facing the main opening of the kitchen oven in the operating position, the parts closest to the user being regarded as being at the front.
  • the muffle 1 defines inside itself a cooking compartment 2 intended for the introduction of the food to be heated or cooked.
  • the cooking compartment 2 substantially parallelepiped, is delimited on the bottom by a lower panel 3, from the rectangular perimeter thereof a first lateral panel 4a, a rear panel 60 and a second lateral panel 4b extend upwards, which connect to an upper panel 5.
  • the fourth lateral face of the cooking compartment 2 defines a front opening 8, closeable by means of a designated small door 80.
  • the rear panel 60 has a central depression surrounded by a peripheral portion which connects to the other panels. Said central depression is covered by a cover 7, slightly protruding the peripheral portion of the panel 60.
  • the ventilation compartment houses two fans 11a and 11b, horizontally aligned, and a electrical resistor 12 between them.
  • the fans may have a diameter of 120 mm and may be operated at a speed of 2000 rpm; obviously, said values are not limiting.
  • both the rear panel 60 and the cover 7 can be easily produced from a single plate using traditional forming techniques.
  • the rear end of the cooking compartment 2 closes therefore on a rear surface 6 peripherally defined by the flat portion of the rear panel 60 and centrally defined by the protruding cover 7, the latter defining the interface between the cooking compartment 2 and the ventilation compartment 10.
  • the cover 7 has a substantially box-like geometry, i.e. shaped as a rectangular parallelepiped, wherein a front main face 70 is connected to the rear panel 60 by faces of limited thickness, indicatively lower than 50 mm, which define a perimetric edge 71.
  • the perimetric edge 71 comprises two lateral faces, the right one 71a and the left one 71b, facing the respective lateral panels 4a, 4b; as well as a lower face 71c and a lower face 71d.
  • the cover 7 defines, together with the fans 11a and 11b, a ventilation system suitable for defining a convective current inside the oven, thanks to the opposite rotary motion of the fans 11a and 11b, wherein the left fan 11a rotates counterclockwise and simultaneously the right fan 11b rotates clockwise.
  • the cover 7 has therefore inlet openings 74a and 74b for air, which are obtained frontally for each fan 11a and 11b, so as to introduce air into the ventilation compartment.
  • the outlet openings 75a, 75b for air are respectively obtained on the lateral edges 71a, 71b, close to their lower vertex.
  • the opposite rotations of the fans 11a and 11b radially blow the air coming in from the inlet opening 74a and 74b toward the outlet openings 75a, 75b.
  • the air is centrally sucked by the fans 11a and 11b, thereby being introduced in the ventilation compartment 10 through the inlet openings 74a and 74b, and is heated by the electrical resistor 12, which is located centrally between the two fans.
  • the fans generate an air flow with circular motion which comes out heated from the outlet openings 75a and 75b, thereby going into the cooking compartment 2.
  • the inlet openings 74a and 74b are defined by inlet grids, each inlet grid facing the bodies of the fans 11a and 11b, respectively.
  • Said grids, which are specular to each other, are defined by a plurality of openings shaped as an arc of a circle which spread from a full center.
  • the electrical resistor 12 is placed beyond the diameter of said circular grids, i.e. it does not face the inlet openings 74a and 74b and is between the two fans 11a and 11b.
  • the outlet openings 75a, 75b are in particular a plurality of aligned longitudinal slots, fourteen for each side in the embodiment illustrated in the figure. Said slots are equally distributed along the respective lateral face 71a, 71b.
  • the total surface of the inlet openings 74a and 74b may be 3000 mm 2 and the total surface of the outlet openings 75a and 75b may be 2000 mm 2 ; obviously, said values are not limiting.
  • the total surface of the inlet openings 74a and 74b is larger than that of the outlet openings 75a and 75b.
  • said air flow allows the temperature set in the cooking compartment 2 to be maintained homogeneous.
  • Said uniformity was experimentally detected by the Applicant using a temperature probe, which measures through sensors the temperature at predetermined times.
  • the sensors are placed in predetermined points, for example in the three cooking levels of the oven or at the edges of the various panels.
  • the kitchen oven 100 has, as mentioned before, a control interface 21 connected to a control unit 20.
  • the control unit 20 is in turn operatively connected to the different functional units of the kitchen oven 1, namely the electrical resistor 12 and the fans 11a and 11b; it also collects the piece of data of temperature of the thermostat inside the cooking compartment 2.
  • the user can set different cooking modes, which the control unit 20 executes by operating said different functional units. At least one of said cooking modes involves operating both fans 11a, 11b in counter-rotation, possibly with simultaneous activation of the electrical resistor 12.

Landscapes

  • 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 (13)

  1. Ein Küchenofen (100), umfassend:
    einen Garraum (2), der durch eine untere Verkleidung (3), eine erste Seitenverkleidung (4a) und eine zweite, der ersten gegenüberliegenden Seitenverkleidung (4b), eine obere Verkleidung (5) und eine einer Frontöffnung (8) gegenüberliegende Rückseite (6) begrenzt ist;
    eine Belüftungskammer (10) hinter dem Garraum (2);
    eine Abdeckung (7), die den Garraum (2) und die Belüftungskammer (10) voneinander trennt, wobei die Abdeckung (7) Einlassöffnungen (74a; 74b) und Auslassöffnungen (75a; 75b) für Luft aufweist;
    mindestens einen elektrischen Widerstand (12), der innerhalb der Belüftungskammer (10) angeordnet ist;
    mindestens zwei Ventilatoren (11a; 11b), die innerhalb der Belüftungskammer (10) angeordnet sind und so ausgelegt sind, dass sie sich gleichzeitig mit entgegengesetzten Kreisbewegungen drehen, wodurch eine Strömung innerhalb der Belüftungskammer (10) zwischen den Einlassöffnungen (74a; 74b), die sich vor den Ventilatoren (11a; 11b) befinden, und den Auslassöffnungen (75a; 75b), die radial versetzt zu den Ventilatoren (11a; 11b) liegen, erzeugt wird;
    wobei die Belüftungskammer (10) ein zusammenhängender Raum ist;
    dadurch gekennzeichnet,
    dass die Gesamtfläche der Auslassöffnungen (75a; 75b) kleiner ist als die Gesamtfläche der Einlassöffnungen (74a; 74b), so dass die durch die entgegengesetzten Kreisbewegungen der Ventilatoren (11a; 11b) erzeugte Strömung einen Überdruck innerhalb der Belüftungskammer (10) erzeugt;
    dass sich der elektrische Widerstand (12) vollständig in einem Bereich zwischen den beiden Ventilatoren (11a; 11b) befindet; und
    dass der elektrische Widerstand (12) eine kreisförmige Form aufweist und auf einer parallelen Achse zentriert ist, die zwischen den beiden Ventilatoren (11a; 11b) angeordnet ist.
  2. Küchenofen (100) nach dem vorhergehenden Ansprüch, wobei die Ventilatoren horizontal ausgerichtet sind.
  3. Küchenofen (100) nach einem der vorhergehenden Ansprüche, wobei die beiden Ventilatoren (11a; 11b) Schaufeln aufweisen, die jeweils entgegengesetzt geformt sind und für eine Drehung im Uhrzeigersinn bzw. gegen den Uhrzeigersinn ausgelegt sind.
  4. Küchenofen (100) nach einem der vorhergehenden Ansprüche, wobei die Einlassöffnungen (74a; 74b) vollständig an jedem Ventilator (11a; 11b) auf der Hauptfläche (70) der Abdeckung (7) vorgesehen sind und Lufteinlassgitter bilden, die direkt auf die Ventilatoren (11a; 11b) ausgerichtet sind.
  5. Küchenofen (100) nach einem der vorhergehenden Ansprüche, wobei die Auslassöffnungen (75a; 75b) ausschließlich am Umfang der Abdeckung (7) angeordnet sind.
  6. Küchenofen (100) nach Anspruch 5, wobei die Abdeckung (7) von der Rückseite (6) in den Garraum (2) hineinragt und eine vordere Hauptfläche (70) sowie mindestens eine Umfangskante (71) aufweist, wobei die Einlassöffnungen (74a; 74b) auf der Hauptfläche (70) und die Auslassöffnungen (75a; 75b) auf der Umfangskante (71) vorgesehen sind.
  7. Küchenofen (100) nach Anspruch 6, wobei die Auslassöffnungen (75a; 75b) mindestens auf gegenüberliegenden Seitenflächen (71a; 71b) der Umfangskante (71) vorgesehen sind.
  8. Küchenofen (100) nach Anspruch 7, wobei die Auslassöffnungen (75a; 75b) eine Vielzahl von Löchern sind, die linear auf den Seitenflächen (71a; 71b) angeordnet sind.
  9. Küchenofen (100) nach Anspruch 8, wobei die Auslassöffnungen (75a; 75b) gleichmäßig über die gesamte Seitenfläche (71a; 71b) verteilt sind.
  10. Küchenofen (100) nach einem der Ansprüche 7-9, wobei die Auslassöffnungen (75a; 75b) auf den beiden gegenüberliegenden Seitenflächen (71a; 71b) symmetrisch sind.
  11. Küchenofen (100) nach einem der Ansprüche 7-10, wobei an der Unterfläche (71c) der Umfangskante (71) keine Auslassöffnungen (75a; 75b) vorgesehen sind.
  12. Küchenofen (100) nach einem der vorhergehenden Ansprüche, wobei das Verhältnis der Flächen der Einlassöffnungen (74a; 74b) zu denen der Auslassöffnungen (75a; 75b) größer als 1 und gleich oder kleiner als 2 ist.
  13. Küchenofen (100) nach einem der vorhergehenden Ansprüche, umfassend eine Steuereinheit (20), die so konfiguriert ist, dass sie die Ventilatoren (11a; 11b) gleichzeitig in entgegengesetzten Drehrichtungen betreibt.
EP22425008.4A 2022-02-25 2022-02-25 Küchenherd mit gegenläufigen ventilatoren Active EP4235039B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22425008.4A EP4235039B1 (de) 2022-02-25 2022-02-25 Küchenherd mit gegenläufigen ventilatoren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22425008.4A EP4235039B1 (de) 2022-02-25 2022-02-25 Küchenherd mit gegenläufigen ventilatoren

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EP4235039A1 EP4235039A1 (de) 2023-08-30
EP4235039B1 true EP4235039B1 (de) 2026-01-28

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EP (1) EP4235039B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025100270A1 (ja) * 2023-11-09 2025-05-15 パナソニックＩｐマネジメント株式会社 加熱調理器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1459311A (en) * 1973-02-17 1976-12-22 Neff Werke Hot gas baking oven-
US20180152996A1 (en) * 2016-11-30 2018-05-31 Illinois Tool Works Inc. Convection system for employment with an rf oven
US10132505B2 (en) * 2015-03-17 2018-11-20 Samsung Electronics Co., Ltd. Cooking appliance and method of controlling the same

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US6943321B2 (en) * 2002-08-30 2005-09-13 Wolf Appliance Company, Llc Convection oven with forced airflow circulation zones
DE10316503B3 (de) * 2003-04-09 2004-09-23 Miwe Michael Wenz Gmbh Backofen und Verfahren zum Betrieb eines Backofens
KR101249863B1 (ko) * 2005-10-31 2013-04-05 삼성전자주식회사 조리장치
EP2126473A4 (de) * 2007-01-17 2010-03-03 Lg Electronics Inc Ofen
WO2009012526A1 (en) * 2007-07-23 2009-01-29 Clara Appliances Pty Ltd An oven
US8138452B2 (en) * 2008-07-14 2012-03-20 Whirlpool Corporation Convection oven
WO2011022419A2 (en) * 2009-08-19 2011-02-24 Wolf Appliance, Inc. Convection system and baffle for oven
US11480343B2 (en) * 2019-10-10 2022-10-25 Haier Us Appliance Solutions, Inc. Oven appliance equipped with multiple fans for selecting convection air flow direction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1459311A (en) * 1973-02-17 1976-12-22 Neff Werke Hot gas baking oven-
US10132505B2 (en) * 2015-03-17 2018-11-20 Samsung Electronics Co., Ltd. Cooking appliance and method of controlling the same
US20180152996A1 (en) * 2016-11-30 2018-05-31 Illinois Tool Works Inc. Convection system for employment with an rf oven

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