(19)
(11)EP 3 134 684 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
18.07.2018 Bulletin 2018/29

(21)Application number: 16721774.4

(22)Date of filing:  03.05.2016
(51)Int. Cl.: 
F24C 15/00  (2006.01)
H05B 6/64  (2006.01)
F24C 15/02  (2006.01)
(86)International application number:
PCT/EP2016/059922
(87)International publication number:
WO 2016/180684 (17.11.2016 Gazette  2016/46)

(54)

A COOKING OVEN WITH AN OVEN CAVITY AND AN OVEN DOOR

BACKOFEN MIT EINEM HERDINNENRAUM UND OFENTÜR

FOUR DE CUISSON AVEC UNE CAVITÉ DE FOUR ET UNE PORTE DE FOUR


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 08.05.2015 EP 15166866

(43)Date of publication of application:
01.03.2017 Bulletin 2017/09

(73)Proprietor: Electrolux Appliances Aktiebolag
105 45 Stockholm (SE)

(72)Inventor:
  • VERDOLIVA, Valerio
    47122 Forli (IT)

(74)Representative: Electrolux Group Patents 
AB Electrolux Group Patents
105 45 Stockholm
105 45 Stockholm (SE)


(56)References cited: : 
EP-A1- 1 566 594
EP-A2- 1 120 607
DE-A1-102010 007 286
US-A1- 2007 158 330
EP-A1- 2 180 259
DE-A1- 3 839 657
GB-A- 2 176 378
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description


    [0001] The present invention relates to a cooking oven including an oven cavity and an oven door for opening and closing a front opening of said oven cavity according to the preamble of claim 1.

    [0002] A conventional cooking oven requires some time to obtain the necessary temperature inside the oven cavity. When the oven door is opened by the user, then a temperature drop is occurred in the oven cavity. Said temperature drop disturbs the cooking process. Further, the temperature drop increases the cooking time and the energy consumption.

    [0003] EP 2 180 259 A1 discloses a cooking oven with airflow control devices. An air duct encloses the oven cavity. An air inlet of said air duct is arranged below a front opening of the oven cavity. An air outlet of the air duct is arranged above the front opening of the oven cavity. When the front opening of the oven cavity is closed by an oven door, then the air from the air duct is blown out through the air outlet. However, when the oven door is opened, then the air from the air duct is deflected downwards, so that an airflow thermal barrier is formed in the area in front of the opened oven cavity.

    [0004] US 2007/0158330 A1 discloses a cooking oven with an oven cavity. A fan with a suction duct and an exhaust duct is located above said oven cavity, wherein the suction duct is arranged above the exhaust duct. External air is introduced through an intake into the suction duct, wherein said intake is arranged above an oven door. The air from the exhaust duct is directed downwardly when is oven door is opened, so that an air curtain is formed in front of the oven cavity. When the oven door is closed, then the air from the exhaust duct flows through said oven door.

    [0005] GB 2 176 378 A discloses a cooking appliance, wherein a heating equipment is arranged above an oven cavity. The heat is transferred from the heating equipment to the oven cavity by an air stream. Said air stream is generated by a fan. The air stream is controlled by a ventilation flap. Said ventilation flap selects, if the air stream from the heating equipment is directed to the environment via an outflow channel or into the oven cavity via a flow channel.

    [0006] EP 1 120 607 A2 discloses a cooking appliance with an oven cavity. At least one vent is formed in the top wall, in the rear wall and/or in the bottom wall of the oven cavity. Primary, the vents are provided for discharging vapours. In another operation mode, an air curtain is formed between the vents in the top wall and in the bottom wall.

    [0007] It is an object of the present invention to provide a cooking oven with an improved air curtain, which allows a reduced temperature drop within the oven cavity, when the oven door is opened.

    [0008] The object of the present invention is achieved by the cooking oven according to claim 1.

    [0009] According to the present invention the opening is formed as a cut-out between the oven cavity and the air duct, wherein the ventilation flap covers directly said cut-out in the closed state of the opening, while the ventilation flap acts as a deflecting plate for the air stream in the opened state of said opening, so that said air stream leaves the air duct through the opening and streams vertically downwards within the front portion of the oven cavity.

    [0010] The core of the present invention is the opening in the horizontal front portion of the top wall of the oven cavity, which is openable and closable in dependence of the opened and closed states, respectively, of the oven door. The opening connects the air duct to the oven cavity, so that the air curtain is formed inside the oven cavity in the opened state of the oven door. Since the air curtain is formed inside the oven cavity, a relative big thermal barrier between the oven cavity and the front area of said oven cavity is obtained by a relative small flow rate of the air stream. The ventilation flap has a double function. On the one hand the ventilation flap closes the opening in the closed state. On the other hand the ventilation flap deflects downwardly the air stream from the air duct into the oven cavity in the opened state.

    [0011] In particular, the air duct includes at least one air outlet connecting said air duct to the surroundings of the cooking oven. The air outlet of the air duct is especially used, if the air curtain is deactivated.

    [0012] Preferably, the air outlet is arranged above the front opening of the oven cavity and at a front side of the cooking oven. A conventional air channel for cooling the oven cavity may be used for generating the air curtain.

    [0013] According to a preferred embodiment of the present invention the air outlet is at least partially closed by the ventilation flap in the opened state of the oven door and opened by the ventilation flap in the closed state of the oven door. In this case, the ventilation flap has a triple function. Besides the closing of the opening in the top wall and the deflecting of the air stream, the ventilation flap closes and opens the air outlet of the air duct.

    [0014] Further, the air duct may include at least one air inlet connecting said air duct to the surroundings of the cooking oven.

    [0015] For example, the air inlet is arranged below the front opening of the oven cavity and at a front side of the cooking oven.

    [0016] Moreover, at least one further opening may be formed in a front portion of a bottom wall of the oven cavity, wherein said further opening connects the air duct to the oven cavity.

    [0017] In particular, the further opening is closed by a further ventilation flap in the closed state of the oven door and opened by said further ventilation flap in the opened state of the oven door, so that the air curtain is sucked through the further opening into the air duct.

    [0018] Alternatively or additionally, the air curtain or at least a part of said air curtain exhausts through a gap between the opened oven door and the front opening of the oven cavity.

    [0019] According to the preferred embodiment of the present invention the air stream in the air duct and the air curtain within the front portion of the oven cavity form a closed air circuit in the opened state of the oven door.

    [0020] In contrast, the air stream in the air duct may form an open air circuit in the closed state of the oven door.

    [0021] Further, at least one fan may be arranged within the air duct and above the top wall of the oven cavity. The conventional air channel for cooling the oven cavity may be used for the present invention.

    [0022] Moreover, at least one electronic circuit may be arranged within the air duct and above the top wall of the oven cavity, wherein preferably said electronic circuit forms a control unit of the cooking oven or a part of said control unit of the cooking oven. The electronic circuit may be cooled down directly by the air stream in the air duct.

    [0023] In particular, the oven door includes at least one further air duct formed inside said oven door, wherein said further air duct extends vertically in the closed state of the oven door, and wherein preferably a further air stream is generated by a Venturi effect and moves bottom-up inside the oven door. The further air duct and the Venturi effect allow a passive cooling of the oven door.

    [0024] Preferably, the actuation of the ventilation flap and/or the further ventilation flap is automatically controlled by the opening and closing of the oven door.

    [0025] For example, the actuation of the ventilation flap and/or the further ventilation flap may be mechanically performed by at least one spring element.

    [0026] According to another example, the actuation of the ventilation flap and/or the further ventilation flap may be performed by an electric and/or electromagnetic drive unit.

    [0027] Novel and inventive features of the present invention are set forth in the appended claims.

    [0028] The present invention will be described in further detail with reference to the drawing, in which
    FIG 1
    illustrates a schematic sectional side view of a cooking oven according to a preferred embodiment of the present invention, wherein an oven door is in a closed state,
    FIG 2
    illustrates a schematic sectional side view of the cooking oven according to the preferred embodiment of the present invention, wherein the oven door is in an opened state,
    FIG 3
    illustrates a schematic sectional side view of the cooking oven according to a further embodiment of the present invention, wherein the oven door is in the closed state, and
    FIG 4
    illustrates a schematic detailed sectional side view of an upper front part of the cooking oven according to the further embodiment of the present invention, wherein the oven door is in the closed state.


    [0029] FIG 1 illustrates a schematic sectional side view of a cooking oven 10 according to a preferred embodiment of the present invention, wherein an oven door 14 is in a closed state.

    [0030] The cooking oven 10 includes an oven cavity 12. A front opening of said oven cavity 12 is closable by the oven door 14. In FIG 1 the oven door 14 is in the closed state. A fan 16 is arranged inside an air duct 18. In this example, the fan 16 is arranged above the oven cavity 12. The air duct 18 encloses at least partially the oven cavity 12. In this example, the air duct 18 extends below a bottom wall of the oven cavity 12, behind a rear wall of the oven cavity 12 and above a top wall 30 of the oven cavity 12. The cross-section of the air duct 18 extends substantially over the whole width of the oven cavity 12, at least above the top wall 30 in the front portion of the oven cavity 12. Alternatively, the cooking oven 10 includes two or more parallel air ducts 18. The air duct 18 includes an air outlet 20 arranged above the front opening of the oven cavity 12. In the closed state of the oven door 14 the air outlet 20 is arranged above said oven door 14.

    [0031] At least one opening 24 is formed in the top wall 30 of the oven cavity 12. The air duct 18 and the oven cavity 12 are connected via said opening 24. The at least one opening 24 is openable and closable by at least one ventilation flap 22. The opening 24 is formed as a cut-out between the oven cavity 12 and the air duct 18, wherein the ventilation flap 22 covers directly said cut-out in the closed state of the opening 24. A pivoting axis of the ventilation flap 22 is arranged directly in front of the opening 24. The opening 24 is closed by the ventilation flap 22, when the oven door 14 is in the closed state. The one or more openings 24 extend substantially over the whole width of the top wall 30 of the oven cavity 12.

    [0032] The fan 16 generates an air stream 26 inside the air duct 18. The air stream 26 is provided for cooling down the environment of the oven cavity 12. The air stream 26 enters the air duct 18 through one or more air inlets. For example, the air inlet may be arranged below the oven door 14 and at the front side of the cooking oven 10. Alternatively or additionally, the air inlet may be arranged at the rear side of the cooking oven 10. The air stream 26 leaves the air duct 18 through the air outlet 20.

    [0033] FIG 2 illustrates a schematic sectional side view of the cooking oven 10 according to the preferred embodiment of the present invention, wherein the oven door 14 is in an opened state.

    [0034] When the oven door 14 is in the opened state, then the opening 24 is opened by the ventilation flap 22. Further, the air outlet 20 is partially or completely closed by said ventilation flap 22, when the oven door 14 is in the opened state. Moreover, the ventilation flap 22 acts as a deflecting plate for the air stream 26, so that said air stream leaves the air duct 18 through the opening 24 and streams vertically downwards within a front portion of the oven cavity 12. Thereby, an air curtain 28 is formed within the front portion of the oven cavity 12, when the oven door 14 is opened. The air curtain 28 insulates the thermal state of the oven cavity 12, when the oven door 14 is opened. The air curtain 28 provides a shield for the oven cavity 12.

    [0035] Optionally, one or more further openings are formed in the bottom wall of the oven cavity 12. Preferably, the at least one further opening in the bottom wall of the oven cavity 12 is arranged vertically below the at least one opening 24 formed in the top wall 30 of said oven cavity 12. The one or more further openings are provided that the air curtain 28 enters the air duct 18 again. Thus, the air stream 26 including the air curtain 28 forms a closed cycle, when the oven door 14 is opened. Alternatively, the air curtain 28 may leave the cooking oven 10 through a gap between the oven door 14 and the front opening of said oven cavity 12.

    [0036] The air curtain 28 inside the oven cavity 12 has the advantage that the temperature inside the oven cavity 12 is maintained, when the oven door 14 is opened. Thereby energy and cooking time are saved. Another advantage of the air curtain 28 inside the oven cavity 12 is that a sudden temperature drop is prevented, which would have a bad impact for same cooking recipes. A further advantage is that the air curtain 28 inside the oven cavity 12 avoids that the user is exposed to the hot vapour when the oven door 14 is opened.

    [0037] FIG 3 illustrates a schematic sectional side view of the cooking oven 10 according to a further embodiment of the present invention, wherein the oven door 14 is in the closed state.

    [0038] The cooking oven 10 includes the oven cavity 12 with the front opening closed by the oven door 14. The fan 16 is arranged inside the air duct 18. In this example, the fan 16 is arranged above the oven cavity 12. The air duct 18 encloses at least partially the oven cavity 12. In this example, the air duct 18 extends beneath the bottom wall of the oven cavity 12, behind the rear wall of the oven cavity 12 and directly above the top wall 30 of the oven cavity 12. Preferably, the cross-section of the air duct 18 extends substantially over the whole width of the oven cavity 12, at least above the top wall 30 in the front portion of the oven cavity 12. Alternatively, the cooking oven 10 may include two or more parallel air ducts 18. The air duct 18 includes an air outlet 20 arranged above the front opening of the oven cavity 12. An operator control panel may be arranged above said air outlet 20. In the closed state of the oven door 14 the air outlet 20 is arranged above said oven door 14.

    [0039] At least one opening 24 is formed in the top wall 30 of the oven cavity 12. The air duct 18 and the oven cavity 12 are connected via said opening 24. The opening 24 is openable and closable by the ventilation flap 22. The opening 24 is formed as a cut-out between the oven cavity 12 and the air duct 18, wherein the ventilation flap 22 covers directly said cut-out in the closed state of the opening 24. The pivoting axis of the ventilation flap 22 is arranged directly in front of the opening 24. The opening 24 is closed by the ventilation flap 22, when the oven door 14 is in the closed state. However, when the oven door 14 is in the opened state, then the opening 24 is opened by the ventilation flap 22. For example, the one or more openings 24 extend substantially over the whole width of the top wall 30 of the oven cavity 12.

    [0040] The fan 16 generates the air stream 26 inside the air duct 18 provided for cooling down the environment of the oven cavity 12. An electronic circuit 32 is arranged inside the air duct 18. In this example, the electronic circuit 32 is arranged above the top wall 30 of the oven cavity 12. In particular, the electronic circuit 32 forms the control unit of the cooking oven 10 or a part of said control unit. The air stream 26 is also provided for cooling down the electronic circuit 32. The air stream 26 enters the air duct 18 through one or more air inlets. For example, the air inlet may be arranged below the oven door 14 and at the front side of the cooking oven 10. Alternatively or additionally, the air inlet may be arranged at the rear side of the cooking oven 10. The air stream 26 leaves the air duct 18 through the air outlet 20.

    [0041] When the oven door 14 is in the opened state, then the opening 24 is opened by the ventilation flap 22, wherein the air outlet 20 is partially or completely closed by said ventilation flap 22. Further, the ventilation flap 22 may act as a deflecting plate for the air stream 26, so that said air stream 26 leaves the air duct 18 through the opening 24 and streams vertically downwards within the front portion of the oven cavity 12. Thereby, the air curtain 28 shown in FIG 2 is formed within the front portion of the oven cavity 12, when the oven door 14 is opened. The air curtain 28 insulates the thermal state of the oven cavity 12 and provides the shield for the oven cavity 12, when the oven door 14 is opened.

    [0042] The air curtain 28 inside the oven cavity 12 maintains the temperature inside the oven cavity 12, when the oven door 14 is opened, so that energy and cooking time are saved and the sudden temperature drop is prevented, which would have a bad impact for same cooking recipes. Further, the air curtain 28 inside the oven cavity 12 avoids that the user is exposed to the hot vapour when the oven door 14 is opened.
    A further air stream 34 is generated inside the oven door 14. Said further air stream 34 moves bottom-up inside the oven door 14. The further air stream 34 inside the oven door 14 is generated by the Venturi effect. A Venturi pipe is formed by a door outlet 36 at an upper end of the oven door 14 and by the air outlet 20. The further air stream 34 is sucked from the kitchen into the interior of the oven door 14 through an inlet at a lower end of said oven door 14. The further air stream 34 is blown out from the interior of the oven door 14 through the door outlet 36 at the upper end of said oven door 14. The further air stream 34 provides a cooling of the oven door 14.
    FIG 4 illustrates a schematic detailed sectional side view of an upper front part of the cooking oven 10 according to the further embodiment of the present invention, wherein the oven door 14 is in the closed state.
    The Venturi pipe is formed by the door outlet 36 at the upper end of the oven door 14 and by the air outlet 20. The further air stream 34 is blown out from the interior of the oven door 14 through the door outlet 36 at the upper end of said oven door 14. The further air stream 34 provides the cooling of the oven door 14.

    List of reference numerals



    [0043] 
    10
    cooking oven
    12
    oven cavity
    14
    oven door
    16
    fan
    18
    air duct
    20
    air outlet
    22
    ventilation flap
    24
    opening
    26
    air stream
    28
    air curtain
    30
    top wall
    32
    electronic circuit
    34
    further air stream
    36
    door outlet
    38
    further air duct



    Claims

    1. A cooking oven (10) including an oven cavity (12) and an oven door (14) for opening and closing a front opening of said oven cavity (12), wherein:

    - the cooking oven (10) comprises at least one air duct (18) enclosing at least partially the oven cavity (12),

    - at least a part of the air duct (18) extends directly above a top wall (30) of the oven cavity (12),

    - the cooking oven (10) comprises at least one fan (16) for generating an air stream (26) within the air duct (18) or at the air duct (18),

    - the cooking oven (10) comprises at least one ventilation flap (22) for deflecting downwards the air stream (26) leaving the air duct (18) above the oven cavity (12),

    - at least one opening (24) is formed in a horizontal front portion of the top wall (30) of the oven cavity (12) and connects the air duct (18) to the oven cavity (12), and

    - the opening (24) is closed by the ventilation flap (22) in the closed state of the oven door (14) and opened by the ventilation flap (22) in the opened state of the oven door (14), so that an air curtain (28) is formed within a front portion of the oven cavity (12) in the opened state of the oven door (14),

    characterised in that
    the opening (24) is formed as a cut-out between the oven cavity (12) and the air duct (18), wherein the ventilation flap (22) covers directly said cut-out in the closed state of the opening (24), while the ventilation flap (22) acts as a deflecting plate for the air stream (26) in the opened state of the opening, so that said air stream leaves the air duct (18) through the opening (24) and streams vertically downwards within the front portion of the oven cavity (12).
     
    2. The cooking oven (10) according to claim 1,
    characterised in that
    the air duct (18) includes at least one air outlet (20) connecting said air duct (18) to the surroundings of the cooking oven (10), wherein preferably said air outlet (18) is arranged above the front opening of the oven cavity (12) and at a front side if the cooking oven (10).
     
    3. The cooking oven (10) according to claim 2,
    characterised in that
    the air outlet (18) is at least partially closed by the ventilation flap (22) in the opened state of the oven door (14) and opened by the ventilation flap (22) in the closed state of the oven door (14).
     
    4. The cooking oven (10) according to any one of the preceding claims,
    characterised in that
    the air duct (18) includes at least one air inlet connecting said air duct (18) to the surroundings of the cooking oven (10), wherein preferably said air inlet is arranged below the front opening of the oven cavity (12) and at a front side of the cooking oven (10).
     
    5. The cooking oven (10) according to any one of the preceding claims,
    characterised in that
    at least one further opening is formed in a front portion of a bottom wall (30) of the oven cavity (12), wherein said further opening connects the air duct (18) to the oven cavity (12).
     
    6. The cooking oven (10) according to any one of the preceding claims,
    characterised in that
    the further opening is closed by a further ventilation flap in the closed state of the oven door (14) and opened by said further ventilation flap in the opened state of the oven door (14), so that the air curtain (28) is sucked through the further opening into the air duct (18).
     
    7. The cooking oven (10) according to any one of the preceding claims,
    characterised in that
    the air curtain (28) or at least a part of said air curtain (28) exhausts through a gap between the opened oven door (14) and the front opening of the oven cavity (12).
     
    8. The cooking oven (10) according to any one of the claims 1 to 6,
    characterised in that
    the air stream (26) in the air duct (18) and the air curtain (28) within the front portion of the oven cavity (12) form a closed air circuit in the opened state of the oven door (14).
     
    9. The cooking oven (10) according to any one of the claims 1 to 6,
    characterised in that
    the air stream (26) in the air duct (18) forms an open air circuit in the closed state of the oven door (14).
     
    10. The cooking oven (10) according to any one of the preceding claims,
    characterised in that
    at least one fan (16) is arranged within the air duct (18) and above the top wall (30) of the oven cavity (12).
     
    11. The cooking oven (10) according to any one of the preceding claims,
    characterised in that
    at least one electronic circuit (32) is arranged within the air duct (18) and above the top wall (30) of the oven cavity (12), wherein preferably said electronic circuit (32) forms a control unit of the cooking oven (10) or a part of said control unit of the cooking oven (10).
     
    12. The cooking oven (10) according to any one of the preceding claims,
    characterised in that
    the oven door (14) includes at least one further air duct (38) formed inside said oven door (14), wherein said further air duct (38) extends vertically in the closed state of the oven door (14), and wherein preferably a further air stream (34) is generated by a Venturi effect and moves bottom-up inside the oven door (14).
     
    13. The cooking oven (10) according to any one of the preceding claims,
    characterised in that
    the actuation of the ventilation flap (22) and/or the further ventilation flap is automatically controlled by the opening and closing of the oven door (14).
     
    14. The cooking oven (10) according to any one of the preceding claims,
    characterised in that
    the actuation of the ventilation flap (22) and/or the further ventilation flap is mechanically performed by at least one spring element.
     
    15. The cooking oven (10) according to any one of the preceding claims,
    characterised in that
    the actuation of the ventilation flap (22) and/or the further ventilation flap is performed by an electric and/or electromagnetic drive unit.
     


    Ansprüche

    1. Backofen (10), der einen Herdinnenraum (12) und eine Ofentür (14) zum Öffnen und Schließen einer vorderen Öffnung des Herdinnenraums (12) aufweist, wobei:

    - der Backofen (10) mindestens einen Luftkanal (18) aufweist, der den Herdinnenraum (12) mindestens teilweise umschließt,

    - sich mindestens ein Teil des Luftkanals (18) direkt über einer oberen Wand (30) des Herdinnenraums (12) erstreckt,

    - der Backofen (10) mindestens ein Gebläse (16) zum Erzeugen eines Luftstroms (26) in dem Luftkanal (18) oder an dem Luftkanal (18) aufweist,

    - der Backofen (10) mindestens eine Lüftungsklappe (22) zum Ablenken des Luftstroms (26), der den Luftkanal (18) über dem Herdinnenraum (12) verlässt, nach unten aufweist,

    - mindestens eine Öffnung (24) in einem horizontalen Vorderabschnitt der oberen Wand (30) des Herdinnenraums (12) gebildet ist und den Luftkanal (18) mit dem Herdinnenraum (12) verbindet, und

    - die Öffnung (24) in dem geschlossenen Zustand der Ofentür (14) durch die Lüftungsklappe (22) verschlossen wird und in dem geöffneten Zustand der Ofentür (14) durch die Lüftungsklappe (22) derart geöffnet wird, dass in dem geöffneten Zustand der Ofentür (14) ein Luftvorhang (28) innerhalb eines Vorderabschnitts des Herdinnenraums (12) gebildet wird,

    dadurch gekennzeichnet, dass
    die Öffnung (24) als eine Aussparung zwischen dem Herdinnenraum (12) und dem Luftkanal (18) gebildet ist, wobei die Lüftungsklappe (22) die Aussparung in dem geschlossenen Zustand der Öffnung (24) direkt abdeckt, wohingegen die Lüftungsklappe (22) in dem geöffneten Zustand der Öffnung derart als eine Ablenkplatte für den Luftstrom (26) fungiert, dass der Luftstrom den Luftkanal (18) durch die Öffnung (24) verlässt und innerhalb des Vorderabschnitts des Herdinnenraums (12) in vertikaler Richtung nach unten strömt.
     
    2. Backofen (10) nach Anspruch 1,
    dadurch gekennzeichnet, dass
    der Luftkanal (18) mindestens einen Luftauslass (20) aufweist, der den Luftkanal (18) mit der Umgebung des Backofens (10) verbindet, wobei der Luftauslass (18) vorzugsweise über der vorderen Öffnung des Herdinnenraums (12) und an einer Vorderseite des Backofens (10) angeordnet ist.
     
    3. Backofen (10) nach Anspruch 2,
    dadurch gekennzeichnet, dass
    der Luftauslass (18) mindestens teilweise in dem geöffneten Zustand der Ofentür (14) durch die Lüftungsklappe (22) verschlossen wird und in dem geschlossenen Zustand der Ofentür (14) durch die Lüftungsklappe (22) geöffnet wird.
     
    4. Backofen (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    der Luftkanal (18) mindestens einen Lufteinlass aufweist, der den Luftkanal (18) mit der Umgebung des Backofens (10) verbindet, wobei der Lufteinlass vorzugsweise unter der vorderen Öffnung des Herdinnenraums (12) und an einer Vorderseite des Backofens (10) angeordnet ist.
     
    5. Backofen (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    mindestens eine weitere Öffnung in einem Vorderabschnitt einer unteren Wand (30) des Herdinnenraums (12) gebildet ist, wobei die weitere Öffnung den Luftkanal (18) mit dem Herdinnenraum (12) verbindet.
     
    6. Backofen (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    die weitere Öffnung in dem geschlossenen Zustand der Ofentür (14) durch eine weitere Lüftungsklappe verschlossen wird und in dem geöffneten Zustand der Ofentür (14) durch die weitere Lüftungsklappe derart geöffnet wird, dass der Luftvorhang (28) durch die weitere Öffnung hindurch in den Luftkanal (18) gesaugt wird.
     
    7. Backofen (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    der Luftvorhang (28) oder mindestens ein Teil des Luftvorhangs (28) durch einen Spalt zwischen der geöffneten Ofentür (14) und der vorderen Öffnung des Herdinnenraums (12) ausströmt.
     
    8. Backofen (10) nach einem der Ansprüche 1 bis 6,
    dadurch gekennzeichnet, dass
    der Luftstrom (26) in dem Luftkanal (18) und der Luftvorhang (28) innerhalb des Vorderabschnitts des Herdinnenraums (12) in dem geöffneten Zustand der Ofentür (14) einen geschlossenen Luftkreislauf bilden.
     
    9. Backofen (10) nach einem der Ansprüche 1 bis 6,
    dadurch gekennzeichnet, dass
    der Luftstrom (26) in dem Luftkanal (18) in dem geschlossenen Zustand der Ofentür (14) einen offenen Luftkreislauf bildet.
     
    10. Backofen (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    mindestens ein Gebläse (16) in dem Luftkanal (18) und über der oberen Wand (30) des Herdinnenraums (12) angeordnet ist.
     
    11. Backofen (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    mindestens eine elektronische Schaltung (32) in dem Luftkanal (18) und über der oberen Wand (30) des Herdinnenraums (12) angeordnet ist, wobei die elektronische Schaltung (32) vorzugsweise eine Steuereinheit des Backofens (10) oder einen Teil der Steuereinheit des Backofens (10) bildet.
     
    12. Backofen (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    die Ofentür (14) mindestens einen weiteren Luftkanal (38) aufweist, der in der Ofentür (14) gebildet ist, wobei sich der weitere Luftkanal (38) in dem geschlossenen Zustand der Ofentür (14) in vertikaler Richtung erstreckt, und wobei vorzugsweise ein weiterer Luftstrom (34) durch einen Venturi-Effekt erzeugt wird und sich in der Ofentür (14) von unten nach oben bewegt.
     
    13. Backofen (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    die Betätigung der Lüftungsklappe (22) und/oder der weiteren Lüftungsklappe automatisch durch das Öffnen und Schließen der Ofentür (14) gesteuert wird.
     
    14. Backofen (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    die Betätigung der Lüftungsklappe (22) und/oder der weiteren Lüftungsklappe durch mindestens ein Federelement mechanisch durchgeführt wird.
     
    15. Backofen (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    die Betätigung der Lüftungsklappe (22) und/oder der weiteren Lüftungsklappe durch eine elektrische und/oder elektromagnetische Antriebseinheit durchgeführt wird.
     


    Revendications

    1. Four de cuisson (10) comprenant une cavité de four (12) et une porte de four (14) pour ouvrir et fermer une ouverture avant de ladite cavité de four (12),

    - le four de cuisson (10) comprenant au moins un conduit d'air (18) entourant au moins partiellement la cavité de four (12),

    - au moins une partie du conduit d'air (18) s'étendant directement au-dessus d'une paroi supérieure (30) de la cavité de four (12),

    - le four de cuisson (10) comprenant au moins un ventilateur (16) pour générer un flux d'air (26) à l'intérieur du conduit d'air (18) ou au niveau du conduit d'air (18),

    - le four de cuisson (10) comprenant au moins un volet de ventilation (22) pour dévier vers le bas le flux d'air (26) sortant du conduit d'air (18) au-dessus de la cavité de four (12),

    - au moins une ouverture (24) étant formée dans une partie avant horizontale de la paroi supérieure (30) de la cavité de four (12) et raccordant le conduit d'air (18) à la cavité de four (12), et

    - l'ouverture (24) étant fermée par le volet de ventilation (22) dans l'état fermé de la porte de four (14) et ouverte par le volet de ventilation (22) dans l'état ouvert de la porte de four (14), de telle sorte qu'un rideau d'air (28) est formé à l'intérieur d'une partie avant de la cavité de four (12) dans l'état ouvert de la porte de four (14),

    caractérisé en ce que
    l'ouverture (24) est formée sous la forme d'une découpe entre la cavité de four (12) et le conduit d'air (18), le volet de ventilation (22) recouvrant directement ladite découpe dans l'état fermé de l'ouverture (24), tandis que le volet de ventilation (22) agit comme une plaque déflectrice pour le flux d'air (26) dans l'état ouvert de l'ouverture, de telle sorte que ledit flux d'air quitte le conduit d'air (18) à travers l'ouverture (24) et s'écoule verticalement vers le bas à l'intérieur de la partie avant de la cavité de four (12).
     
    2. Four de cuisson (10) selon la revendication 1,
    caractérisé en ce que
    le conduit d'air (18) comprend au moins une sortie d'air (20) raccordant ledit conduit d'air (18) à l'environnement du four de cuisson (10), de préférence ladite sortie d'air (18) étant disposée au-dessus de l'ouverture avant de la cavité de four (12) et au niveau d'un côté avant du four de cuisson (10).
     
    3. Four de cuisson (10) selon la revendication 2,
    caractérisé en ce que
    la sortie d'air (18) est au moins partiellement fermée par le volet de ventilation (22) dans l'état ouvert de la porte de four (14) et ouverte par le volet de ventilation (22) dans l'état fermé de la porte de four (14).
     
    4. Four de cuisson (10) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le conduit d'air (18) comprend au moins une entrée d'air raccordant ledit conduit d'air (18) à l'environnement du four de cuisson (10), de préférence ladite entrée d'air étant disposée au-dessous de l'ouverture avant de la cavité de four (12) et au niveau d'un côté avant du four de cuisson (10).
     
    5. Four de cuisson (10) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    au moins une autre ouverture est formée dans une partie avant d'une paroi inférieure (30) de la cavité de four (12), ladite autre ouverture raccordant le conduit d'air (18) à la cavité de four (12).
     
    6. Four de cuisson (10) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'autre ouverture est fermée par un autre volet de ventilation dans l'état fermé de la porte du four (14) et ouverte par ledit autre volet de ventilation dans l'état ouvert de la porte de four (14), de telle sorte que le rideau d'air (28) est aspiré à travers l'autre ouverture dans le conduit d'air (18).
     
    7. Four de cuisson (10) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le rideau d'air (28) ou au moins une partie dudit rideau d'air (28) s'échappe par un espace entre la porte de four ouverte (14) et l'ouverture avant de la cavité de four (12).
     
    8. Four de cuisson (10) selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    le flux d'air (26) dans le conduit d'air (18) et le rideau d'air (28) à l'intérieur de la partie avant de la cavité de four (12) forment un circuit d'air fermé dans l'état ouvert de la porte de four (14).
     
    9. Four de cuisson (10) selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    le flux d'air (26) dans le conduit d'air (18) forme un circuit d'air libre dans l'état fermé de la porte de four (14).
     
    10. Four de cuisson (10) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    au moins un ventilateur (16) est disposé à l'intérieur du conduit d'air (18) et au-dessus de la paroi supérieure (30) de la cavité de four (12).
     
    11. Four de cuisson (10) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    au moins un circuit électronique (32) est disposé à l'intérieur du conduit d'air (18) et au-dessus de la paroi supérieure (30) de la cavité de four (12), ledit circuit électronique (32) formant de préférence une unité de commande du four de cuisson (10) ou une partie de ladite unité de commande du four de cuisson (10).
     
    12. Four de cuisson (10) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la porte de four (14) comprend au moins un autre conduit d'air (38) formé à l'intérieur de ladite porte de four (14), ledit autre conduit d'air (38) s'étendant verticalement dans l'état fermé de la porte de four (14), et de préférence un autre flux d'air (34) étant généré par un effet Venturi et se déplaçant du bas vers le haut à l'intérieur de la porte de four (14).
     
    13. Four de cuisson (10) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'actionnement du volet de ventilation (22) et/ou de l'autre volet de ventilation est commandé automatiquement par l'ouverture et la fermeture de la porte de four (14).
     
    14. Four de cuisson (10) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'actionnement du volet de ventilation (22) et/ou de l'autre volet de ventilation est effectué mécaniquement par au moins un élément ressort.
     
    15. Four de cuisson (10) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'actionnement du volet de ventilation (22) et/ou de l'autre volet de ventilation est effectué par une unité d'entraînement électrique et/ou électromagnétique.
     




    Drawing












    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description