(19)
(11)EP 3 109 558 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
04.12.2019 Bulletin 2019/49

(21)Application number: 16175624.2

(22)Date of filing:  22.06.2016
(51)Int. Cl.: 
F24C 15/32  (2006.01)
F24C 15/36  (2006.01)

(54)

CONVECTION HEATING DEVICE FOR A COOKING OVEN

KONVEKTIONSHEIZUNGSVORRICHTUNG FÜR ÖFEN

DISPOSITIF DE CHAUFFAGE PAR CONVECTION POUR UN 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: 24.06.2015 EP 15173600

(43)Date of publication of application:
28.12.2016 Bulletin 2016/52

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

(72)Inventors:
  • SPECHT, Trevor
    91541 Rothenburg ob der Tauber (DE)
  • CATALOGNE, Cedric
    33080 Porcia (IT)

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


(56)References cited: : 
EP-A2- 1 970 635
EP-A2- 2 716 990
DE-A1- 2 557 867
DE-A1-102010 029 308
EP-A2- 2 235 446
WO-A1-2006/000702
DE-A1-102009 026 644
US-A1- 2006 272 632
  
      
    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 convection heating device for an oven cavity of a cooking oven according to the preamble of claim 1. Moreover, the present invention relates to a cooking oven with a convection heating device.

    [0002] In the convection heating mode, forced convection plays a significant part in the cooking process. A radial fan driven by a motor rotates and generates an air flow taken from the oven cavity through an inlet of a fan cover arranged in front of the rear wall of the oven cavity. Said fan cover is a separating wall between a convection heating device and the proper oven cavity. Thus, the convection heating device forms the rear portion of the oven cavity. Usually, the radial fan is arranged at the centre of the rear wall of the oven cavity. Then, the air flow is heated up by a heating element arranged between the fan cover and the rear wall of the oven cavity. At last, the air flow enters the proper oven cavity again through opening in an outer portion of the fan cover or through a gap between the border of the fan cover and the rear wall of the oven cavity. The structure of the fan cover determines the geometric distribution of the air flow into the proper oven cavity.

    [0003] FIG 5 illustrates a schematic front view of the convection heating device in the oven cavity of the cooking oven according to the prior art. Said convection heating device is arranged in a rear portion of the oven cavity 10 and directly in front of the rear wall 12 of said oven cavity 10. The convection heating device comprises the fan cover 14, the radial fan 16 and the heating element 18. The fan cover 14 is substantially formed as a sheet and arranged parallel to the rear wall 12 of the oven cavity 10. The radial fan 16 is arranged between the fan cover 14 and the rear wall 12. Further, the radial fan 16 is arranged in the central portion of the rear wall 12. The rotation axis of the radial fan 16 extends perpendicular to the planes of the fan cover 14 and the rear wall 12. The heating element 18 encloses the radial fan 16. The fan cover 14 comprises the inlet section 20 and the outlet section 22. The inlet section 20 is arranged in the central portion of the fan cover 14 and in front of the radial fan 16. The outlet section 22 is formed between the border of the fan cover 16 and the rear wall 12 of the oven cavity 10.

    [0004] The radial fan 16 sucks the airflow 26 from the centre of the oven cavity 10 through the inlet section 20. The airflow 26 to the radial fan 16 streams parallel to the rotation axis of the radial fan 16. From the radial fan 16 the airflow 26 streams radially to the rotation axis of the radial fan 16 and then through the outlet section 22 into the oven cavity 10.

    [0005] FIG 6 illustrates a schematic top view of the convection heating device in the oven cavity 10 of the cooking oven according to the prior art. The radial fan 16 sucks the airflow 26 from the centre of the oven cavity 10 through the inlet section 20, wherein said airflow 26 streams parallel to the rotation axis of the radial fan 16. Afterwards the air flow 26 from the radial fan 16 radially to the rotation axis of the radial fan 16 and between the fan cover 14 and the rear wall 12 of the oven cavity 10 and then through the outlet section 22 into the oven cavity 10. Thereby a substantial part of the air flow 26 streams along the side walls of the oven cavity 10 and towards an oven door and is then redirected to the central portion of the oven cavity 10. The fan cover 14 avoids that the air flow 26 is directly blown from the heating element to the food stuff in the centre of the oven cavity 10.

    [0006] However, the side walls of the oven cavity 10 are heated up strongly, since a substantial part of the air flow 26 streams along said side walls. The side walls form a large thermal mass, so that the energy losses to the ambient increase and therefore energy consumption increases. It would be advantageous, if the heating-up of the side walls of the oven cavity 10 could be reduced.

    [0007] US 2006/0272632 A1 discloses a convection cooking appliance including a radial fan, a heating element and a fan cover. The radial fan is arranged in front of a rear wall of the oven cavity. The main plane of the fan cover includes an outlet portion for directing convectional airflow into the oven cavity. The outlet portion includes an angled louver and a trip edge portion, so that the airflow into the oven cavity runs perpendicular to the main plane of the fan cover. The outlet portion includes two rectangular grids arranged in the lateral portions of the main plane of the fan cover. An inlet portion is arranged in the centre of the main plane of the fan cover and between said grids.

    [0008] DE 25 57 867 A1 discloses a convection cooking oven including a radial fan and a fan cover. The radial fan is arranged in front of a rear wall of the oven cavity. The main plane of the fan cover includes an outlet portion for directing convectional airflow into the oven cavity. The outlet portion includes two rectangular slots arranged in the lateral portions of the main plane of the fan cover. An inlet portion is arranged in the centre of the main plane of the fan cover and between said slots. WO 2006/000702 A1 discloses a convector oven including a radial fan and a fan cover. The radial fan is arranged in front of a rear wall of the oven cavity. The main plane of the fan cover includes an outlet portion for directing convectional airflow into the oven cavity. The outlet portion includes four groups of holes arranged in the outer portion of the main plane of the fan cover. An inlet portion is arranged in the centre of the main plane of the fan cover and between said four groups of holes.

    [0009] EP 2 716 990 A2 discloses a device for inserting cooled or heated air into a room. The device is arrangeable at a side wall or ceiling of said room. The device includes a casing and a fan inside said casing. An air inlet is arranged in a central portion, while an annular air outlet encloses said air inlet. The air outlet has a structure that the air stream flows helically in the room.

    [0010] EP 1 970 635 A2 discloses a convection cooking oven. A radial fan is arranged at the rear wall of the oven cavity. A fan cover is arranged in front of said fan. An outlet section of said fan cover includes curved longitudinal cut-outs. Two deflecting plates extend rearwards from each cut-out. A portion of the curved longitudinal cut-out extends radially with respect to the centre of the fan cover.

    [0011] A further prior art convection heating device is described in EP2 235 446 B1.

    [0012] It is an object of the present invention to provide a convection heating device for an oven cavity of a cooking oven, wherein said fan cover avoids a strong heating-up of the said walls of the oven cavity.

    [0013] The object is achieved by the convection heating device according to claim 1.

    [0014] According to the present invention the at least one curved longitudinal side of the cut-out of the outlet section is concave to the centre of the fan cover, wherein the at least one deflecting plate is curved, and wherein said curved deflecting plate has the same curvature as the corresponding curved longitudinal side of the cut-out.

    [0015] The core of the present invention is the orientation of the cut-outs of the outlet section with respect to the directions of air flows from the radial fan on the one hand and the deflecting plate extending rearwards on the other hand. The air flows from the radial fan have radial components, but also tangential components. The orientation of the cut-out of the outlet section allows that a maximum part of the air flow reaches perpendicularly the longitudinal side of said cut-out. The deflecting plate extending rearwards is preferably placed upstream respect to the incoming flow, and generates favoured turbulences, preferably which guide the air flow into said cut out so air flow emerge perpendicular to the fan cover. The airflow from the convection heating device into the oven cavity removes away from the side walls of the oven cavity on the one hand and passes by the food stuff arranged in the centre of said oven cavity on the other hand. The heating-up of the side walls of the oven cavity is reduced and the heat distribution inside the oven cavity is substantially even. The inventive convection heating device avoids energy losses in the environment of the side walls of the oven cavity.

    [0016] For example, the angles between the longitudinal axes of the cut-outs of the outlet section and the corresponding reference axes are between 30° and 60°, in particular between 40° and 50°. The angles are adapted to the direction of the airflow from the radial fan. Said airflow from the radial fan has a radial and a tangential component.

    [0017] Preferably, the deflecting plate has the same size as the corresponding cut-out.

    [0018] In particular, the deflecting plate extends perpendicular to the main plane of the fan cover.

    [0019] According to one embodiment of the present invention, at least one longitudinal side of the cut-outs of the outlet section is linear.

    [0020] In this case, at least one deflecting plate may be plane.

    [0021] According to the present invention, at least one longitudinal side of the cut-outs of the outlet section is curved.

    [0022] Further, the at least one curved longitudinal side of the cut-out of the outlet section is concave to the centre of the fan cover.

    [0023] Also the at least one deflecting plate is curved.

    [0024] The curved deflecting plate has the same curvature as the corresponding curved longitudinal side of the cut-out.

    [0025] Moreover, the size of the inlet section of the fan cover may be adapted to the size of the radial fan. This optimizes the air flow from the oven cavity into the convection heating device.

    [0026] Further, the present invention relates to a fan cover for a convection heating device in an oven cavity of a cooking oven, wherein
    the fan cover is provided for the convection heating device mentioned above.

    [0027] Preferably, the at least one heating element encloses the radial fan.

    [0028] For example, the at least one heating element is a ring heating element.

    [0029] Moreover, the present invention relates to a cooking oven with a convection heating device, wherein the cooking oven comprises a convection heating device and/or a fan cover mentioned above.

    [0030] In particular, the width and/or the height of the fan cover are marginally smaller than the width and the height, respectively, of the rear wall of the oven cavity.

    [0031] Preferably, a space between the fan cover, the side wall of said fan cover and the rear wall of the oven cavity is closed, without regard to the inlet section and outlet section.

    [0032] Novel and inventive features of the present invention are set forth in the appended claims.

    [0033] The present invention will be described in further detail with reference to the drawing, in which
    FIG 1
    illustrates a schematic front view and top view of an example of a convection heating device not forming part of the invention in an oven cavity of a cooking oven,
    FIG 2
    illustrates a schematic front view and top view of the convection heating device in the oven cavity of the cooking oven according to the present invention,
    FIG 3
    illustrates a schematic top view of the convection heating device in the oven cavity of the cooking oven according to the present invention,
    FIG 4
    illustrates a detailed schematic top view of the convection heating device in the oven cavity of the cooking oven according to the present invention,
    FIG 5
    illustrates a schematic front view of the convection heating device in the oven cavity of the cooking oven according to the prior art, and
    FIG 6
    illustrates a schematic top view of the convection heating device in the oven cavity of the cooking oven according to the prior art.


    [0034] FIG 1 illustrates a schematic front view and top view of a convection heating device in an oven cavity 10 of a cooking oven according to an example not forming part of the present invention. The front view of the convection heating device is shown in the upper picture in FIG 1, while the top view of said convection heating device is shown in the lower picture therein.

    [0035] The convection heating device is arranged in a rear portion of the oven cavity 10. The convection heating device comprises a fan cover 14, a radial fan 16, a heating element 18, and the rear wall 12 of said oven cavity. The fan cover 14 is substantially formed as a sheet and arranged parallel to the rear wall 12 of the oven cavity 10. The radial fan 16 is arranged between the fan cover 14 and the rear wall 12. The radial fan 16 is arranged in a central portion of the rear wall 12. The rotation axis of the radial fan 16 extends perpendicular to the planes of the fan cover 14 and the rear wall 12. In this example, the heating element 18 encloses the radial fan 16. The fan cover 14 comprises an inlet section 20 and an outlet section 22. The inlet section 20 is arranged in a central portion of the fan cover 14. The inlet section 20 includes a plurality of holes. Said plurality of holes is substantially arranged in front of the radial fan 16. The outlet section 22 includes a number of cut-outs arranged in an outer portion of the fan cover 16. In this example, the outlet section 22 of the fan cover 14 includes four cut-outs. In this embodiment, each cut-out has a rectangular shape and hence four edges. The longitudinal sides of the rectangular cut-outs are arranged substantially perpendicular to the direction of the airflow from the radial fan 16.

    [0036] A side wall 28 encloses the border of said fan cover 14. The side wall 28 extends perpendicular to the fan cover 14. In this example, the fan cover 14 and the side wall 28 are formed as a single-piece part. The side wall 28 extends rearwards from the border of the fan cover 14 to the rear wall 12 of the oven cavity 10. The rear wall 12, the fan cover 14 and the side wall 28 form a space. Without regard to the inlet section 20 and outlet section 22, said space is a closed space.

    [0037] Further, each cut-out includes a deflecting plate 24 at one edge. The deflecting plate 24 is arranged at that edge, which is the closest to the radial fan 16 and to the centre of the fan cover 14. The deflecting plates 24 are bent rearward. The planes of the deflecting plates 24 extend substantially perpendicular to the planes of the rear wall 12 and fan cover 14. In this example, the area of each deflecting plate 24 is the same as the corresponding cut-out. Thus, the deflecting plate 24 may be obtained by a U-shaped cut in the fan cover 14, wherein the resulting flap is subsequently bended rearwards.

    [0038] The deflecting plates 24 generate favoured turbulences. Said turbulence contribute that the airflow from the convection heating device into the oven cavity, preferably emerging perpendicularly to the fan cover 14, and therefore removes away from the side walls of the oven cavity on the one hand and passes by the food stuff arranged in the centre of said oven cavity on the other hand.

    [0039] The radial fan 16 sucks the airflow 26 from the centre of the oven cavity 10 through the inlet section 20. The airflow 26 to the radial fan 16 streams parallel to the rotation axis of the radial fan 16. In contrast, the airflow 26 from the radial fan 16 streams radial to the rotation axis of the radial fan 16. However, the airflow 26 from the radial fan 16 has also a component tangential to the rotation axis of the radial fan 16. Initially, the radial fan 16 blows the airflow 26 between the rear wall 12 and the fan cover 14 and parallel to planes of the rear wall 12 and fan cover 14. Then, the airflow 26 from the radial fan 16 is deflected by the deflecting plates 24, streams through the cut-outs of the outlet section 22 and substantially forwards into a central portion of the oven cavity 10.

    [0040] The airflow 26 from the radial fan 16 has also a component tangential to the rotation axis of the radial fan 16. The orientation of the rectangular cut-outs are arranged substantially perpendicular to the direction of the airflow 26 from the radial fan 16.

    [0041] FIG 2 illustrates a schematic front view and top view of the convection heating device in the oven cavity 10 of the cooking oven according to the present invention.

    [0042] The front view of the convection heating device is shown in the upper picture in FIG 2, while the top view of said convection heating device is shown in the lower picture therein.

    [0043] The convection heating device according to the embodiment has substantially the same structure as the convection heating device of FIG 1. The example not forming part of the invention and the embodiment of the invention differ in the shapes of the cut-outs of the outlet section 22. In the embodiment of the invention the longitudinal sides of the cut-outs are curved. The longitudinal sides of the cut-outs are concave in relation to the incident air flow 26. The directions of the incident air flow 26 are perpendicular to the corresponding sections of the longitudinal side. The deflecting plates 24 are similarly curved as the corresponding longitudinal sides.

    [0044] The convection heating devices according to the example not forming part of the invention and the embodiment of the invention may be combined. The fan cover 14 may include one or more cut-outs with linear longitudinal sides as well as one or more cut-outs with curved longitudinal sides.

    [0045] FIG 3 illustrates a schematic top view of the convection heating device in the oven cavity 10 of the cooking oven according to the embodiment of the present invention. FIG 3 clarifies the distribution of the airflow 26.

    [0046] The airflow 26 is sucked by the radial fan 16 from the centre of the oven cavity 10 through the inlet section 20, wherein the airflow 26 to the radial fan 16 streams substantially parallel to the rotation axis of the radial fan 16. Then, the airflow 26 leaves the radial fan 16 radial to the rotation axis of said radial fan 16, wherein the airflow 26 is blown by the radial fan 16 between the rear wall 12 and the fan cover 14 and parallel to planes of said rear wall 12 and fan cover 14. Afterwards, the airflow 26 from the radial fan 16 is deflected by the deflecting plates 24, streams through the cut-outs of the outlet section 22 and substantially forwards into the oven cavity 10. Thereby, the distance between the airflow 26 and the side wall of the oven cavity 10 increases. Thus, the hot airflow 26 does not directly impact onto the side walls of the oven cavity 10. Otherwise, the hot airflow 26 does not directly impact onto food stuff in the centre of the oven cavity 10. These properties effect reduced heating-up of the side walls of the oven cavity 10 as well as a substantially even heat distribution inside said oven cavity 10. The inventive fan cover 14 avoids energy losses in the environment of the side walls of the oven cavity 10.

    [0047] FIG 4 illustrates a detailed schematic top view of the convection heating device in the oven cavity 10 of the cooking oven according to the embodiment of the present invention. FIG 4 shows the environment around a cut-out of the outlet section 22.

    [0048] Turbulences 30 are formed downstream the deflecting plate 24. Said turbulences 30 allow the deflection of the air flow 26. Without the deflecting plate 24, the air flow 26 would stream lineally through the cut-out into the oven cavity 10 and then towards to the side wall of said oven cavity.

    [0049] FIG 5 illustrates a schematic front view of the convection heating device in the oven cavity of the cooking oven according to the prior art.

    [0050] The convection heating device of the prior art is arranged in a rear portion of the oven cavity 10 and directly in front of the rear wall 12 of said oven cavity 10. The convection heating device comprises the fan cover 14, the radial fan 16 and the heating element 18. The fan cover 14 is substantially formed as a sheet and arranged parallel to the rear wall 12 of the oven cavity 10. The radial fan 16 is arranged between the fan cover 14 and the rear wall 12. The radial fan 16 is arranged in a central portion of the rear wall 12. The rotation axis of the radial fan 16 extends perpendicular to the planes of the fan cover 14 and the rear wall 12. The heating element 18 encloses the radial fan 16.

    [0051] The fan cover 14 comprises the inlet section 20 and the outlet section 22. The inlet section 20 is arranged in a central portion of the fan cover 14 and in front of the radial fan 16. The outlet section 22 is formed between the border of the fan cover 16 and the rear wall 12 of the oven cavity 10.

    [0052] The radial fan 16 sucks the airflow 26 from the centre of the oven cavity 10 through the inlet section 20. The airflow 26 to the radial fan 16 streams parallel to the rotation axis of the radial fan 16. From the radial fan 16 the airflow 26 streams radially to the rotation axis of the radial fan 16 and then through the outlet section 22 into the oven cavity 10.

    [0053] FIG 6 illustrates a schematic top view of the convection heating device in the oven cavity 10 of the cooking oven according to the prior art. The radial fan 16 sucks the airflow 26 from the centre of the oven cavity 10 through the inlet section 20, wherein said airflow 26 streams parallel to the rotation axis of the radial fan 16. Afterwards the air flow 26 from the radial fan 16 radially to the rotation axis of the radial fan 16 and between the fan cover 14 and the rear wall 12 of the oven cavity 10 and then through the outlet section 22 into the oven cavity 10. Thereby a substantial part of the air flow 26 streams along a side wall of the oven cavity 10, so that the side walls of the oven cavity 10 are heated up strongly. The side walls form a large thermal mass resulting in large energy consumption.

    [0054] The large energy consumption on grounds of the heating-up of the side walls of the oven cavity 10 is overcome by the fan cover 14 according to the present invention. Additionally, the fan cover 14 of the present invention allows a substantially even heat distribution inside the oven cavity 10.

    List of reference numerals



    [0055] 
    10
    oven cavity
    12
    rear wall
    14
    fan cover
    16
    radial fan
    18
    heating element
    20
    inlet section
    22
    outlet section
    24
    deflecting plate
    26
    airflow
    28
    side wall
    30
    turbulences



    Claims

    1. A convection heating device for an oven cavity (10) of a cooking oven, wherein:

    - the convection heating device comprises a radial fan (16), at least one heating element (18), a fan cover (14) and the rear wall (12) of the oven cavity (10),

    - the radial fan (16) and the heating element (18) are arrangeable or arranged between the fan cover (14) and the rear wall (12) of the oven cavity (10),

    - at least one main plane of the fan cover (14) extends parallel to the rear wall (12) in the mounted state of said fan cover (14),

    - the fan cover (14) comprises an inlet section (20) arranged in a central portion of said fan cover (14),

    - the inlet section (20) includes a plurality of holes and/or slots,

    - the fan cover (14) comprises an outlet section (22) arranged in an outer portion of said fan cover (14),

    - the outlet section (22) includes a number of cut-outs,

    - the inlet section (20) and outlet section (22) are arranged in the main plane of the fan cover (14),

    - the fan cover (14) comprises a side wall (28) enclosing a border of said fan cover (14) and extending rearwards from the main plane of said fan cover (14),

    - the cut-outs of the outlet section (22) have longitudinal shapes,

    - the longitudinal axes of the cut-outs of the outlet section (22) are inclined with respect to corresponding reference axes perpendicular to radial directions originating from the centre of the fan cover (14) and passing the centres of the cut-outs, and wherein said reference axes extend within the main plane of the fan cover (14), - at least one cut-out of the outlet section (22) comprises a deflecting plate (24) extending rearwards from that longitudinal side of said cut-out, which is the closest longitudinal side to the centre of the fan cover (14), in particular wherein said deflecting plate (24) is placed upstream to the flow direction, and

    - at least one longitudinal side of the cut-outs of the outlet section (22) is curved,

    - the at least one deflecting plate (24) is curved,

    - and wherein said curved deflecting plate (24) has the same curvature as the corresponding curved longitudinal side of the cut-out,

    characterised in that
    the at least one curved longitudinal side of the cut-out of the outlet
    section (22) is concave to the centre of the fan cover (14).
     
    2. The convection heating device according to claim 1,
    characterised in that
    the angles between the longitudinal axes of the cut-outs of the outlet section (22) and the corresponding reference axes are between 30° and 60°, in particular between 40° and 50°.
     
    3. The convection heating device according to claim 1 or 2,
    characterised in that
    the deflecting plate (24) has the same size as the corresponding cut-out.
     
    4. The convection heating device according to any one of the preceding claims,
    characterised in that
    the deflecting plate (24) extends perpendicular to the main plane of the fan cover (14).
     
    5. The convection heating device according to any one of the preceding claims,
    characterised in that
    at least one longitudinal side of the cut-outs of the outlet section (22) is linear, wherein at least one deflecting plate (24) is plane.
     
    6. The convection heating device according to any one of the preceding claims,
    characterised in that
    the size of the inlet section (20) of the fan cover (14) is adapted to the size of the radial fan (16).
     
    7. The convection heating device according to any one of the preceding claims,
    characterised in that
    the at least one heating element (18) encloses the radial fan (16), wherein preferably the at least one heating element is a ring heating element (18).
     
    8. A cooking oven comprising a convection heating device,
    characterised in that
    the cooking oven comprises a convection heating device according to any one of the claims 1 to 7.
     
    9. A cooking oven according to claim 8,
    characterised in that
    the width and/or the height of the fan cover (14) are marginally smaller than the width and the height, respectively, of the rear wall (12) of the oven cavity (10).
     
    10. A cooking oven according to claim 8 or 9,
    characterised in that
    a space between the fan cover (14), the side wall (28) of said fan cover (14) and the rear wall (12) of the oven cavity (10) is closed, without regard to the inlet section (20) and outlet section (22).
     


    Ansprüche

    1. Konvektionsheizungsvorrichtung für einen Ofenhohlraum (10) eines Kochofens, wobei:

    - die Konvektionsheizungsvorrichtung ein radiales Gebläse (16), zumindest ein Heizelement (18), eine Gebläseabdeckung (14) und die Rückwand (12) des Ofenhohlraums (10) umfasst,

    - das radiale Gebläse (16) und das Heizelement (18) zwischen der Gebläseabdeckung (14) und der Rückwand (12) des Ofenhohlraums (10) anordenbar oder angeordnet sind,

    - zumindest eine Hauptebene der Gebläseabdeckung (14) sich im montierten Zustand der Gebläseabdeckung (14) parallel zur Rückwand (12) erstreckt,

    - die Gebläseabdeckung (14) einen Einlassabschnitt (20) umfasst, der in einem zentralen Teil der Gebläseabdeckung (14) angeordnet ist,

    - der Einlassabschnitt (20) mehrere Löcher und/oder Schlitze umfasst,

    - die Gebläseabdeckung (14) einen Auslassabschnitt (22) umfasst, der in einem äußeren Teil der Gebläseabdeckung (14) angeordnet ist,

    - der Auslassabschnitt (22) eine Anzahl von Ausschnitten umfasst,

    - der Einlassabschnitt (20) und der Auslassabschnitt (22) in der Hauptebene der Gebläseabdeckung (14) angeordnet sind,

    - die Gebläseabdeckung (14) eine Seitenwand (28) umfasst, die einen Rand der Gebläseabdeckung (14) einschließt und sich rückwärts von der Hauptebene der Gebläseabdeckung (14) erstreckt,

    - die Ausschnitte des Auslassabschnitts (22) längliche Formen haben,

    - die Längsachsen der Ausschnitte des Auslassabschnitts (22) geneigt sind bezüglich der entsprechenden Bezugsachsen senkrecht zu den radialen Richtungen, die von der Mitte der Gebläseabdeckung (14) ausgehen und durch die Mitten der Ausschnitte verlaufen, und wobei sich die Bezugsachsen innerhalb der Hauptebene der Gebläseabdeckung (14) erstrecken, wobei zumindest ein Ausschnitt des Auslassabschnitts (22) eine Ablenkplatte (24) umfasst, die sich rückwärts von der Längsseite des Ausschnitts erstreckt, die die nächste Längsseite zur Mitte der Gebläseabdeckung (14) ist, wobei insbesondere die Ablenkplatte (24) stromaufwärts der Strömungsrichtung platziert wird, und

    - zumindest eine Längsseite der Ausschnitte des Auslassabschnitts (22) gekrümmt ist,

    - die zumindest eine Ablenkplatte (24) gekrümmt ist,

    - und wobei die gekrümmte Ablenkplatte (24) die gleiche Krümmung wie die entsprechende gekrümmte Längsseite des Ausschnitts hat,

    dadurch gekennzeichnet, dass
    die zumindest eine gekrümmte Längsseite des Ausschnitts des Auslassabschnitts (22) konkav zur Mitte der Gebläseabdeckung (14) ist.
     
    2. Konvektionsheizungsvorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass
    die Winkel zwischen den Längsachsen der Ausschnitte des Auslassabschnitts (22) und den entsprechenden Bezugsachsen zwischen 30° und 60° sind, insbesondere zwischen 40° und 50°.
     
    3. Konvektionsheizungsvorrichtung nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass
    die Ablenkplatte (24) die gleiche Größe wie der entsprechende Ausschnitt hat.
     
    4. Konvektionsheizungsvorrichtung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    sich die Ablenkplatte (24) senkrecht zur Hauptebene der Gebläseabdeckung (14) erstreckt.
     
    5. Konvektionsheizungsvorrichtung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    zumindest eine Längsseite der Ausschnitte des Auslassabschnitts (22) linear ist, wobei zumindest eine Ablenkplatte (24) eben ist.
     
    6. Konvektionsheizungsvorrichtung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    die Größe des Einlassabschnitts (20) der Gebläseabdeckung (14) an die Größe des radialen Gebläses (16) angepasst ist.
     
    7. Konvektionsheizungsvorrichtung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass
    das zumindest eine Heizelement (18) das radiale Gebläse (16) einschließt, wobei das zumindest eine Heizelement vorzugsweise ein Ringheizelement (18) ist.
     
    8. Kochofen, umfassend eine Konvektionsheizungsvorrichtung,
    dadurch gekennzeichnet, dass
    der Kochofen eine Konvektionsheizungsvorrichtung nach einem der Ansprüche 1 bis 7 umfasst.
     
    9. Kochofen nach Anspruch 8,
    dadurch gekennzeichnet, dass
    die Breite und/oder die Höhe der Gebläseabdeckung (14) geringfügig kleiner als die Breite bzw. die Höhe der Rückwand (12) des Ofenhohlraums (10) sind.
     
    10. Kochofen nach Anspruch 8 oder 9,
    dadurch gekennzeichnet, dass
    ein Raum zwischen der Gebläseabdeckung (14), der Seitenwand (28) der Gebläseabdeckung (14) und der Rückwand (12) des Ofenhohlraums (10) geschlossen ist, ungeachtet des Einlassabschnitts (20) und des Auslassabschnitts (22).
     


    Revendications

    1. Dispositif de chauffage par convection pour une cavité de four (10) d'un four de cuisson, dans lequel:

    le dispositif de chauffage par convection comprend un ventilateur radial (16), au moins un élément chauffant (18), un couvercle de ventilateur (14) et la paroi arrière (12) de la cavité de four (10),

    le ventilateur radial (16) et l'élément chauffant (18) peuvent être agencés ou sont agencés entre le couvercle de ventilateur (14) et la paroi arrière (12) de la cavité de four (10),

    au moins un plan principal du couvercle de ventilateur (14) s'étend parallèlement à la paroi arrière (12) à l'état monté dudit couvercle de ventilateur (14),

    le couvercle de ventilateur (14) comprend une section d'entrée (20) agencée dans une partie centrale dudit couvercle de ventilateur (14),

    la section d'entrée (20) comporte une pluralité de trous et/ou de fentes,

    le couvercle de ventilateur (14) comprend une section de sortie (22) agencée dans une partie extérieure dudit couvercle de ventilateur (14),

    le section de sortie (22) comporte un certain nombre de découpes,

    la section d'entrée (20) et la section de sortie (22) sont agencées dans le plan principal du couvercle de ventilateur (14),

    le couvercle de ventilateur (14) comprend une paroi latérale (28) qui délimite une bordure dudit couvercle de ventilateur (14) et qui s'étend vers l'arrière à partir du plan principal dudit couvercle de ventilateur (14),

    les découpes de la section de sortie (22) présentent des formes longitudinales,

    les axes longitudinaux des découpes de la section de sortie (22) sont inclinés par rapport à des axes de référence correspondants perpendiculaires à des directions radiales partant du centre du couvercle de ventilateur (14) et passant par les centres des découpes, et dans lequel lesdits axes de référence s'étendent à l'intérieur du plan principal du couvercle de ventilateur(14),

    au moins une découpe de la section de sortie (22) comprend une plaque déflectrice (24) qui s'étend vers l'arrière à partir de ce côté longitudinal de ladite découpe qui est le côté longitudinal le plus proche du centre du couvercle de ventilateur (14), en particulier dans lequel ladite plaque déflectrice (24) est placée en amont de la direction d'écoulement, et

    au moins un côté longitudinal des découpes de la section de sortie (22) est courbe,

    ladite au moins une plaque déflectrice (24) est courbe, et

    dans lequel ladite plaque déflectrice courbe (24) présente la même courbure que le côté longitudinal courbe correspondant de la découpe,

    caractérisé en ce que ledit au moins un côté longitudinal courbe de la découpe de la section de sortie (22) est concave par rapport au centre du couvercle de ventilateur (14).


     
    2. Dispositif de chauffage par convection selon la revendication 1, caractérisé en ce que les angles entre les axes longitudinaux des découpes de la section de sortie (22) et les axes de référence correspondants sont compris entre 30° et 60°, en particulier entre 40° et 50°.
     
    3. Dispositif de chauffage par convection selon la revendication 1 ou 2, caractérisé en ce que la plaque déflectrice (24) a la même taille que la découpe correspondante.
     
    4. Dispositif de chauffage par convection selon l'une quelconque des revendications précédentes, caractérisé en ce que la plaque déflectrice (24) s'étend perpendiculairement au plan principal du couvercle de ventilateur (14).
     
    5. Dispositif de chauffage par convection selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins un côté longitudinal des découpes de la section de sortie (22) est linéaire, dans lequel au moins une plaque déflectrice (24) est plane.
     
    6. Dispositif de chauffage par convection selon l'une quelconque des revendications précédentes, caractérisé en ce que la taille de la section d'entrée (20) du couvercle de ventilateur (14) est adaptée à la taille du ventilateur radial (16).
     
    7. Dispositif de chauffage par convection selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit au moins un élément chauffant (18) entoure le ventilateur radial (16), dans lequel de préférence ledit au moins un élément chauffant est un élément chauffant annulaire (18).
     
    8. Four de cuisson comprenant un dispositif de chauffage par convection, caractérisé en ce que le four de cuisson comprend un dispositif de chauffage par convection selon l'une quelconque des revendications 1 à 7.
     
    9. Four de cuisson selon la revendication 8, caractérisé en ce que la largeur et/ou la hauteur du couvercle de ventilateur (14) est/sont marginalement inférieure(s) à la largeur et la hauteur, respectivement, de la paroi arrière (12) de la cavité de four (10).
     
    10. Four de cuisson selon la revendication 8 ou 9, caractérisé en ce qu'un espace entre le couvercle de ventilateur (14), la paroi latérale (28) dudit couvercle de ventilateur (14) et la paroi arrière (12) de la cavité de four (10) est fermé, sans considération de la section d'entrée (20) et de la section de sortie (22).
     




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    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description