EP4269880A1 - Four domestique et turbine de ventilateur pour four domestique - Google Patents

Four domestique et turbine de ventilateur pour four domestique Download PDF

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Publication number
EP4269880A1
EP4269880A1 EP22170737.5A EP22170737A EP4269880A1 EP 4269880 A1 EP4269880 A1 EP 4269880A1 EP 22170737 A EP22170737 A EP 22170737A EP 4269880 A1 EP4269880 A1 EP 4269880A1
Authority
EP
European Patent Office
Prior art keywords
air inlet
air
cavity
domestic oven
air outlet
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.)
Pending
Application number
EP22170737.5A
Other languages
German (de)
English (en)
Inventor
Trevor Specht
Michael MÜNZ
Dmytro SOKOVETS
Greg Funk
Ryan Blanchard
Ilona MACHOVSKA
Diego FLORES GALINDO
Marco Böckler
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.)
Electrolux Appliances AB
Original Assignee
Electrolux Appliances AB
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 Electrolux Appliances AB filed Critical Electrolux Appliances AB
Priority to EP22170737.5A priority Critical patent/EP4269880A1/fr
Priority to PCT/EP2023/059662 priority patent/WO2023208596A1/fr
Publication of EP4269880A1 publication Critical patent/EP4269880A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • 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
    • 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
    • F24C15/20—Removing cooking fumes
    • F24C15/2007—Removing cooking fumes from oven cavities
    • 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
    • F24C15/327—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation with air moisturising

Definitions

  • the present invention relates to a domestic oven and to a fan impeller for a domestic oven.
  • EP 3 029 382 A1 discloses a steam oven comprising a humidity flushing system.
  • a steam oven comprises a cavity, wherein said cavity comprises at least one outlet opening for exhaustion of vapor and/or steam out of the cavity into a first duct, wherein said first duct can be opened or closed by a first valve, and at least one inlet opening for influx of air into the cavity from a second duct, wherein said second duct can be opened or closed by a second valve.
  • Said outlet opening is positioned in an upper wall of said cavity.
  • the first duct is arranged such that its first end is in fluid communication with the cavity at said outlet opening, and its second end is in fluid communication with a cooling system, more particularly a cooling chamber, whereas the second duct is arranged such that its first end is in fluid communication with the cavity at said inlet opening, and its second end is in fluid communication with said cooling system, more particularly the cooling chamber. More particularly, the second end of the first duct is arrange in an under pressure region of said cooling system.
  • the object of the present invention is to provide a domestic oven with improved ventilation properties and/or improved convection properties.
  • a domestic oven according to the invention comprises:
  • a domestic oven In a domestic oven according to the invention ambient air is enabled to enter the cooking chamber and not air that has been subject to a cooling system.
  • a simplified ventilation system of the oven with increased efficiency is achieved.
  • Such a efficient ventilation system is particularly advantageous when operated within a domestic steam oven.
  • a desteaming process step for desteaming the cavity of the domestic oven can be accelerated.
  • the air inlet comprises one hole or a plurality of holes, in particular formed in a regular pattern, that is/are arranged, in particular concentrically, around an opening in a cavity wall, in particular a cavity rear wall, for receiving a drive shaft for driving a fan impeller arrangeable or arranged inside of the cavity, and/or in that the air outlet comprises one hole or a plurality of holes, in particular formed in a regular pattern, that is/are arranged in a cavity wall, in particular in a top wall, adjacent to a front end of the cavity, in particular adjacent to the front opening.
  • a plurality of holes formed in a pattern around a hole for receiving a drive shaft enables to suck in ambient our by a fan impeller attached to the drive shaft through the plurality of holes from outside of the cavity into the cavity.
  • a plurality of holes in a regular pattern in general allows to form an air inlet or air outlet that is adapted in its form to the form of a duct element attached thereto.
  • the domestic oven comprises an air inlet duct element that is attached to an exterior side of a cavity wall, in particular a cavity rear wall, in which the one hole or the plurality of holes of the air inlet is/are provided, wherein the air inlet duct element forms an air inlet duct for guiding ambient air to the one hole or the plurality of holes of the air inlet, and/or in that the domestic oven comprises an air outlet duct element that is attached to an exterior surface of a cavity wall, in particular a cavity top wall, in which the one hole or the plurality of holes of the air outlet is/are provided, wherein the air outlet duct element forms an air outlet duct for guiding an air-gas-mixture or an air-gas-steam mixture leaving the one hole or the plurality of holes of the air outlet away from the cavity wall.
  • An air outlet duct element By providing an air inlet duct element, it is possible to guide ambient air from a desired position towards the holes of the air inlet. E.g. it is possible to pass ambient air through an insulation layer of the domestic oven towards the air inlet.
  • An air outlet duct element enables to guide air-gas-mixture or an air-gas-steam mixture generated within the cavity towards a desired position distant from the cavity wall.
  • the size of a passage formed by the air inlet is controllable, in particular in that the domestic oven comprises an air inlet valve for partially and/or fully opening and/or for partially and/or fully closing the passage formed by the air inlet duct and/or formed by the one hole or plurality of holes of the air inlet, and/or in that the size of a passage formed by the air outlet is controllable, in particular in that the domestic oven comprises an air outlet valve for partially and/or fully opening and/or for partially and/or fully closing the passage formed by the air outlet duct and/or formed by the one hole or plurality of holes of the air outlet.
  • the amount or volume of ambient air entering the cavity per time unit is controllable and thus the atmosphere within the cavity can be controlled according to the requirements of a desired cooking process or according to a desired oven function.
  • the atmosphere can be controlled according to the requirements of a desired cooking process or according to a desired oven function.
  • the air inlet valve comprises a first valve element that is configured to partially and/or fully open and/or to partially and/or fully close the passage formed by the air inlet duct
  • the air inlet valve comprises an air inlet duct element that is attached to an exterior side of a cavity wall in which the air inlet is provided, such that the air inlet forms an outlet of the air duct
  • the air outlet valve comprises a second valve element that is configured to partially and/or fully open and/or to partially and/or fully close the passage formed by the air outlet duct
  • the air outlet valve comprises an air outlet duct element that is attached to an exterior side of a cavity wall in which the air outlet is provided, such that the air outlet forms an inlet of the air duct.
  • a domestic oven comprising a microwave function as the main heating function to be provided with an air inlet duct and/or and air outlet duct, but without an air inlet valve and/or an air outlet valve.
  • the air inlet duct and the air outlet duct may contribute to leakage prevention of microwave radiation.
  • a domestic oven comprising a steam cooking function and/or conventional convection and/or upper and/or lower heating function and/or with a pyrolytic cleaning function to have an air outlet duct element with an air outlet valve.
  • the air outlet valve can be fully closed in order to prevent energy losses.
  • the domestic oven may be configured to have the air outlet valve closed, but slightly open or with a passage of small cross-section, such that generation of an overpressure within the cavity is avoided.
  • a domestic oven comprising a steam cooking function and a microwave function and optionally further heating function and/or oven function such as a pyrolytic cleaning function to have an air inlet duct element with an air inlet valve and an air outlet duct element with an air outlet valve, so that the air inlet and the air inlet and the air outlet can be fully controlled.
  • a domestic oven comprising a microwave function or a drying function or any other function that requires an efficient moist air removal
  • the air inlet valve and the air outlet valve are fully open at the same time during the microwave function or the drying function or the other function requiring efficient moist air removal.
  • This reduces condensation inside the cavity and in an inner glass panel of an oven door for opening and closing the discharge opening and enables efficient drying of food within the cavity.
  • a domestic oven comprising a steam cooking, if the air outlet valve is slightly open, e.g. between 5% to 40 %, preferably between 10% and 30%, wherein the air inlet valve is fully closed at the same time.
  • air inlet valve and air outlet valve may be opened fully in order to perform efficient desteaming of the cavity.
  • Such a desteaming step allows to avoid large volumes of steam to come out of the cavity when the oven door is opened by a user.
  • the air inlet valve and the air outlet valve may be opened periodically for a short time, e.g. less than 15s or less than 30s or less than 60s. This may be beneficial for energy efficiency and cooking performance.
  • the air inlet duct element forms a shaft passage for the drive shaft of a fan impeller arrangeable or arranged inside of the cavity that allows the drive shaft to extend straight through the passage of the air inlet duct element and through the opening in the cavity wall, in particular the cavity rear wall, for receiving the drive shaft and wherein the air inlet duct element forms the air inlet duct passing from a first air inlet duct opening being vertically and/or horizontally offset from the shaft passage to a second air inlet duct opening being arranged around the shaft passage and being connected in flow communication with the holes forming the air inlet around the opening for receiving the drive shaft in the cavity rear wall.
  • the domestic oven comprises at least one microwave heating source and/or at least one steam heating source and/or at least one radiation heating source and comprising at least one controllable air inlet and at least one controllable air outlet, wherein the domestic oven is configured to substantially close the controllable air inlet and to partially, preferably slightly, open the controllable air outlet while the domestic oven carries out a function to generate steam and/or to supply steam to the cooking chamber in order to perform a steam cooking process within the cooking chamber.
  • the domestic oven is configured to substantially fully open the controllable air inlet and to substantially fully open the controllable air outlet while the domestic oven carries out a function to remove steam that has been generated and/or supplied to the cooking chamber in order to perform a steam cooking process within the cooking chamber,
  • the domestic oven is configured to fully open the controllable air inlet and to fully open the controllable air outlet while the domestic oven removes moist air that is or has been generated while the domestic oven performs a microwave cooking process
  • the domestic oven is configured to fully open the controllable air inlet and to fully open the controllable air outlet while the domestic oven removes moist air that is or has been generated while the domestic oven performs a drying process using the microwave heating source and/or the radiation heating source,
  • the domestic oven is configured to periodically open and close the controllable air inlet and/or the controllable air outlet while the domestic oven performs a cooking process using the radiation heating source.
  • a domestic oven can include one or more or all of the above described configurations.
  • the air inlet valve and the air outlet valve may be fully open at the same time during the microwave function or the drying function or the other function requiring efficient moist air removal. This reduces condensation inside the cavity and in an inner glass panel of an oven door for opening and closing the discharge opening and enables efficient drying of food within the cavity.
  • it is advantageous for a domestic oven comprising a steam cooking if the air outlet valve is slightly open, e.g. between 5% to 40 %, preferably between 10% and 30%, wherein the air inlet valve is fully closed at the same time.
  • air inlet valve and air outlet valve may be opened fully in order to perform efficient desteaming of the cavity.
  • Such a desteaming step allows to avoid large volumes of steam to come out of the cavity when the oven door is opened by a user.
  • the air inlet valve and the air outlet valve may be opened periodically for a short time, e.g. less thant 15s or less than 30s or less than 60s. This may be beneficial for energy efficiency and cooking performance.
  • the domestic oven comprises a convection fan including a fan impeller being arranged within the cavity at a cavity wall, in particular at a rear wall of the cavity, adjacent to the at least one air inlet, wherein the convection fan is configured to draw ambient through the at least one air inlet into the cavity.
  • Such an fan impeller arrangement is specifically advantageous, because the fan impeller can efficiently suck air into the cavity and convey the air inside the cavity.
  • the holes of the air inlet are concentrically arranged around the drive shaft of the fan impeller.
  • the fan impeller includes an impeller body that comprises a first type of impeller blades on an impeller side facing the cooking chamber and a second type of impeller blades different from the first type on an impeller side facing the cavity wall, in particular wherein the second type of impeller blades is configured to draw ambient air through the at least one air inlet into the cavity.
  • the size of the fan impeller can be reduced and the first and second types of impeller blades can be adopted to their respective functions.
  • the cavity wall, in particular the cavity rear wall, at which the fan impeller is arranged comprises an embossment extending towards the exterior side of the cavity and forming a clearance space on the interior side of the cavity,
  • embossment in the cavity wall that is adopted to the dimensions of the second type of impeller blades allows to create an air volume between the fan impeller and the cavity wall, thus, increasing the efficiency of drawing in air through the air inlet. Further, the embossment may be formed in a way that the ambient air sucked in through the air inlet is restricted from flowing in a vertical direction and is guided in a horizontal direction towards convection chamber outlets formed by the fan cover or between fan cover and cavity wall.
  • the domestic oven may comprise a fan cover within the cavity separating a convection chamber from the cooking chamber, wherein the fan impeller is arranged within the convection chamber, in particular wherein the fan cover comprises central openings for allowing air to be drawn from the cooking chamber into the convection chamber by the fan impeller and wherein the fan cover delimits or forms lateral and/or upper and/or lower openings for allowing air to be exhausted from the convection chamber into the cooking chamber by the fan impeller.
  • the fan impeller may be configured to generate or generates a convection air flow within the cavity and is configured to draw or draws in ambient air through the at least one air inlet and is configured to mix or mixes the drawn in ambient air into the convection air flow.
  • ambient way can be mixed directly into the air-gas-mixture or air-gas-steam mixture present in the cavity, thereby enabling control of the atmosphere within the cavity.
  • the air inlet duct element is embedded within insulation surrounding the cavity, such that ambient air from a region distant from the cavity can pass the air inlet duct element and enter into the cooking chamber through the air inlet duct element.
  • the inlet duct element prevents insulation fibres from being sucked into the cavity. Further, the inlet duct guides ambient air from a position where no insulation is present through the insulation to the air inlet.
  • a drive unit support for supporting a drive unit for driving the convection fan wherein the drive unit support may be arranged outside of the cavity at a distance to the cavity rear wall, wherein a drive unit support opening may be provided within the drive unit support and wherein the air inlet duct element may fludically couple the drive unit support opening with the air inlet, in particular wherein the drive unit support opening may be arranged horizontally and/or vertically offset from the opening for receiving the drive shaft.
  • Another object of the invention is to provide a fan that allows improved ventilation properties and/or improved convection properties within a domestic oven cavity.
  • a fan impeller defining an axis A of rotation and comprising a backing plate and at least two or three or a plurality of fan blades being attached to the backing plate, wherein the backing plate is formed as a substantially flat circular disc and wherein at least one or at least two or all of the fan blades comprise a first blade portion extending substantially from the backing plate and a second blade portion extending as a free end of the fan blade(s) from the first blade portion in an angle ⁇ such that the second blade portion extends non-parallel to a plane being drawn up perpendicular to the axis A of rotation.
  • the second blade portion may be bent or folded from the first blade portion. Further, the free end of the fan blades(s) may point in the direction of rotation, or in other words define the preferred direction of rotation, of the fan impeller. Such a fan impeller is able to properly distribute radially an air flow through passages formed between the separate blades, thus, increasing efficiency of air distribution and performance.
  • the second blade portion according to the invention channels air along the blades during fan impeller rotation.
  • the first blade portion and/or the second blade portion are planar and flat portions of the fan blades and wherein the angle ⁇ between the first blade portion and the second blade portion is in the range between 93° and 120°, in particular between 95° and 110°, preferably is 100°.
  • each first blade portion defines an radially outermost tip of the fan blade to which it belongs, wherein the outermost tip defines a circle upon rotation of the fan impeller, wherein a tangent to the circle and touching the outermost tip encloses an angle ⁇ with a main surface of the first blade portion that is directed radially outwards, wherein the angle ⁇ is in the range between 85° and 45°, in particular between 70° and 50°, preferably is 60°.
  • a main surface of the first blade portion oriented in this way contributes very efficiently to the radial push of air.
  • the fan impeller comprises main fan blades comprising the first and second blade portions and supplementary fan blades, wherein the supplementary fan blades are arranged on the side of the fan impeller that is opposite to the side of the fan impeller on which the main fan blades are arranged, wherein the supplementary fan blades are planar and flat fan blades and wherein the first blade portion of the main fan blades and the supplementary fan blades extend substantially the direction of rotation (R) of the fan impeller, and wherein the main surfaces first blade portions and the main surfaces of the supplementary fan blades are arranged non-parallel to each other.
  • R direction of rotation
  • the backing plate may prevent air on the pressure side to reach the suction side of the fan impeller.
  • the main fan blades and in particular also the supplementary fan blades are formed to a blade element, wherein the blade element may be attached to a backing plate, in particular by a clamp connection or a clinch connection or snap connection.
  • the supplementary fan blades are formed to the backing plate.
  • the backing plate may be formed as a circular and substantially flat disc having a diameter that is substantially equal to the diameter of the substantially wheel-shaped blade element.
  • the supplementary fan blades are planar and flat fan blades, wherein a main surface of the supplementary fan blade that is arranged radially outward and encloses an angle ⁇ with the tangent, wherein the angle ⁇ is in the range between 85° and 45°, in particular between 70° and 50°, preferably is 60°.
  • the main surface of a supplementary fan blade can be parallel to a main surface of an adjacent main fan blade or the main surface of a supplementary fan blade can be arranged in an angle in a range between -15° to 15 ° to a main surface of an adjacent main fan blade.
  • the main fan blades are adapted to be highly efficient in pushing air, wherein the supplemental fan blades are adapted to be highly efficient in drawing air, e.g. through the air inlet in the cavity wall into the cavity.
  • the backing plate and/or the blade element may comprise a hub in which a recess is arranged for receiving a drive shaft operable connected to a drive unit for driving the fan impeller.
  • Fig. 1 illustrates a cavity 10 of a domestic oven.
  • the cavity 10 comprises a top wall 12, side walls 14, 16, a rear wall 18 and a bottom wall 20.
  • the cavity 10 defines a cooking chamber enclosed by the walls 12 to 20 and by a door for selectively opening and closing a discharge opening of the cavity 10.
  • a front opening 22 forms the discharge opening.
  • an air inlet 24 is provided for allowing air to enter the cavity 10. Air may be actively sucked in or pushed through the air inlet 24, by an appropriate ventilation system or it may be sucked in due to an underpressure generated in the cooking chamber.
  • the air inlet 24 is provided with a plurality of holes arranged in a regular pattern in the central part of the rear wall 18.
  • the plurality of holes is arranged around an opening 28 for receiving a drive shaft 50 (not shown in Fig. 1 , but in Figs. 3 and 4 ).
  • the air inlet 24 and opening 28 are arranged within a portion of the rear wall 18 embossed towards the exterior side of the cavity 10, thus, forming an embossment 66.
  • an air outlet 26 is arranged that is located adjacent to a front end of the cavity 10 and adjacent to the right (if shown from a rear perspective) side wall 16. Also the air outlet 26 is provided as a plurality of holes arranged in a regular pattern. Also the air outlet 26 is arranged in a section of the top wall 12 that is embossed towards the exterior side of the cavity, thus, forming an air outlet embossment.
  • Fig. 2a illustrates the cavity 10 as shown in Fig. 1 , wherein additionally an air inlet duct element 30 and an air inlet valve 54, as well as an air outlet duct element 32 and an air outlet valve 56 are attached to the cavity 10. Details of air inlet duct element 3, air inlet valve 54, air outlet duct element 32 and an air outlet valve 56 are shown Fig. 2b to 2e and in Fig. 3 and 4 .
  • the air inlet duct element 30 comprises a duct body forming an air inlet duct 42 extending from a first air inlet duct opening 30a to a second air inlet duct opening 30b (shown in Fig. 4 ).
  • the air inlet duct element 30 is attached to the outside of the cavity rear wall 18 such that the second inlet duct opening 30b is matchingly arranged on the plurality of holes forming the air inlet 24.
  • the first opening 30a is located laterally and/or vertically offset from the second opening 30b, so that the air inlet duct element 30 forms the passage for air to pass from a position offset to the centrally arranged plurality holes of the air inlet 24 towards the centrally arranged plurality holes of the air inlet 24. In this way, ambient air can be guided to the centrally arranged air inlet 24.
  • the air inlet duct element 30 is screwed or otherwise attached to the cavity 10.
  • the first inlet duct opening 30a can be opened and closed by means of the air inlet valve 54. More specifically, the opening 30a can be selectively opened and closed in an infinite way by the first valve element 58.
  • the air inlet valve 54 may comprise a first valve element 58 which can be driven by a valve drive to selectively close, partially close or let the opening 30a fully open.
  • the air inlet valve 54 is fixed to the air inlet duct element 30.
  • the air outlet duct element 32 may be screwed or otherwise connected to the cavity 10.
  • the air outlet duct element 32 has an air outlet duct opening 70 and forms a duct or passage from the air outlet 26 to the air outlet duct opening 70.
  • a second valve element 56 is fixed to the air outlet duct element 32 such that the air outlet duct opening 70 can be selectively opened and closed in an infinite way by the second valve element 60.
  • the air outlet valve 56 may comprise a second valve element 60 which can be driven by a valve drive to selectively close, partially close or let the air outlet duct element 70 fully open.
  • the air outlet valve 56 is fixed to the air duct element 32 as illustrated in Fig. 3 and 4 .
  • a fan cover 34 is provided inside of the cavity 10 to delimit a convection chamber from the cooking chamber.
  • the fan cover 34 is arranged adjacent to the cavity rear wall 18, wherein a ring-shaped heating element 46 and a fan impeller 36 are arranged within the convection chamber.
  • the fan impeller 36 is attached to a drive shaft 50 operably coupled to a drive unit 40 located outside of the cavity 10.
  • the drive shaft 50 extends from outside of the cavity 10 to the opening 28 for receiving drive shaft into the convection chamber.
  • air gas mixture can be sucked from the cooking chamber into the convection chamber through central openings 52 which the fan cover 34 may comprise.
  • the fan cover 34 may be formed and dimensioned in a way that the hot air flow brought in motion by the fan impeller 36 can leave the convection chamber substantially only at lateral openings within the fan cover 34 or between fan cover 34 and cavity rear wall 18, so that a circulating hot air function is achieved.
  • the fan impeller 36 can be driven by the drive shaft 50 in a preferred direction of rotation R. Rotation of the fan impeller 36 in the preferred direction of rotation R causes air to be drawn into the convection chamber through the air inlet 24.
  • the fan impeller 36 can comprise supplementary blades 368 on a fan impeller side facing the air inlet 24.
  • the cavity rear wall 18 may comprise an embossment 66 directed towards the exterior of the cavity 10.
  • the embossment 66 is adapted in form and dimensions to the fan impeller 36 and specifically to the dimensions and position of the supplementary blades 368, such that the supplementary blades 368 can rotate within a space delimited by the embossment 66 and may create a suction air stream within the volume defined by the space formed by the embossment 66 flowing through the air inlet 26 into the convection chamber. Accordingly, the air inlet 26 is located on that part of the cavity rear wall 18 that is part of the embossment 66.
  • a drive unit support 38 is arranged outside of the cavity 10 at a distance to the cavity rear wall 18.
  • the drive unit 40 is fixed to the drive unit support 38.
  • the air inlet duct element 30 forms a shaft passage 64 extending from a shaft opening within the drive unit support 38 to the opening 28 for receiving the drive shaft 50 within the cavity rear wall 18.
  • Fig. 5 to 8 illustrate a fan impeller 360 that is advantageously adopted to be used within a cavity as shown in Fig. 1 to 4 , but also can be used in alternative cavities.
  • the fan impellers 36 and 360 are substantially identical.
  • the fan impeller 360 comprises a backing plate 362 and a blade element 364.
  • Main fan blades 366 are formed to the blade elements 364, wherein the blade element 364 is attached to the backing plate 362 by a clinch or clamping connection, more specifically by a bayonet mount.
  • the backing plate 362 is provided as a substantially flat and circular disc comprising a central opening for receiving the drive shaft 50. Accordingly, an axis A of rotation R is defined for the fan impeller 360.
  • Supplementary fan blades 368 are formed to the backing plate 362.
  • the supplementary fan blades 368 are cut out from the backing plate 362 and bent perpendicular to a main part of the disc forming the backing plate 362.
  • the supplementary fan blade 368 can be formed to the blade element 364.
  • the main fan blades 366 are arranged on a side of the fan impeller 360 opposite to the side comprising the supplementary blade 368.
  • the main fan blades 366 comprise a first blade portion 366a extending substantially perpendicular from the backing plate 362 and the second blade portion 366b that is bent relative to the first blade portion 366 in an angle ⁇ that is not a right angle.
  • the second blade portion 366 extends therefore non-parallel to a plane P drawn up or oriented perpendicular to the axis A of rotation R.
  • the form, position and orientation of the main fan blades 366 define the preferred direction of rotation R, wherein "preferred” shall be understood in that the fan impeller 360 is adopted and suitable to create an air flow very efficiently, when being driven in the preferred direction of rotation R. It is as well possible to drive the fan impeller 360 in the opposite direction and still an air flow would be created, but in a less efficient way.
  • the fan impeller 360 of the shown embodiment comprises eleven main fan blades 366 and nine supplementary fan blades 368, but also seven, fifteen or seventeen main fan blades 366 have been found to be advantageous.
  • a number of supplementary fan blades 368 of the fan impeller 360 that is smaller, e.g. by two less, than the number of main fan blades 366 and/or to provide the supplementary fan blades 368 smaller in their dimension than the main fan blade 366.
  • the first and second blade portions 366a, 366b are planar and flat portions of the main fan blades 366.
  • the angle ⁇ enclosed between the first and second blade portions 366a, 366b may be advantageously in the range between 93° and 120°.
  • Each first blade portion 366 defines a radially outermost tip.
  • a circular line may be defined to which a tangent t 1 can be determined.
  • the tangent t 1 touching the aforementioned circle line encloses an angle ⁇ with a main surface of the first blade portion 366a that is facing in the preferred direction of rotation R.
  • the angle ⁇ may be advantageously in the range between 85° and 45°.
  • each supplementary fan blade 368 may be provided as a flat and planar sheet portion.
  • the longitudinal extension of the sheet portion in a substantially radial direction allows to determine a second tangent t 2 to the outer circumference of the fan impeller 360, more specifically to the outer circumference of the backing plate 362.
  • the second tangent t 2 can enclose an angle ⁇ with a main surface of the corresponding supplementary fan blade 368 that faces the preferred direction of rotation R.
  • the angle ⁇ and the angle ⁇ may be equal or may have a difference in the range between 0° to 20°, in particular between 5° to 20°, preferably between 10° to 20°.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP22170737.5A 2022-04-29 2022-04-29 Four domestique et turbine de ventilateur pour four domestique Pending EP4269880A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22170737.5A EP4269880A1 (fr) 2022-04-29 2022-04-29 Four domestique et turbine de ventilateur pour four domestique
PCT/EP2023/059662 WO2023208596A1 (fr) 2022-04-29 2023-04-13 Four domestique et rotor de ventilateur pour four domestique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22170737.5A EP4269880A1 (fr) 2022-04-29 2022-04-29 Four domestique et turbine de ventilateur pour four domestique

Publications (1)

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EP4269880A1 true EP4269880A1 (fr) 2023-11-01

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EP22170737.5A Pending EP4269880A1 (fr) 2022-04-29 2022-04-29 Four domestique et turbine de ventilateur pour four domestique

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EP (1) EP4269880A1 (fr)
WO (1) WO2023208596A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020179588A1 (en) * 2000-12-15 2002-12-05 Yves Lubrina Oven and an oven control method
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EP3029382A1 (fr) 2014-12-01 2016-06-08 Electrolux Appliances Aktiebolag Appareil de cuisine comprenant un système d'évacuation de l'humidité
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US20020179588A1 (en) * 2000-12-15 2002-12-05 Yves Lubrina Oven and an oven control method
DE10351476A1 (de) * 2003-11-04 2005-06-16 Rational Ag Verfahren und Gargerät zur verbesserten Frischluftzufuhr
US6943322B1 (en) * 2004-04-15 2005-09-13 Maytag Corporation Pressure exhaust system for a convection cooking appliance
DE102005047455A1 (de) * 2004-10-01 2006-04-13 Wss Gmbh Vorrichtung zum Ansaugen von Frischluft in einem Dampf- und/oder Dampfheißluft- und/oder Heißluft- und/oder Mikrowellengerät
DE202011051026U1 (de) * 2011-08-18 2011-10-17 Rational Ag Gargerät mit absperrbaren Entfeuchtungsöffnungen
EP3029382A1 (fr) 2014-12-01 2016-06-08 Electrolux Appliances Aktiebolag Appareil de cuisine comprenant un système d'évacuation de l'humidité
DE102016215650A1 (de) * 2016-08-19 2018-02-22 BSH Hausgeräte GmbH Haushaltsgargerät

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