EP4271943A1 - Four à multiples ventilateurs et son procédé de commande - Google Patents

Four à multiples ventilateurs et son procédé de commande

Info

Publication number
EP4271943A1
EP4271943A1 EP21911694.4A EP21911694A EP4271943A1 EP 4271943 A1 EP4271943 A1 EP 4271943A1 EP 21911694 A EP21911694 A EP 21911694A EP 4271943 A1 EP4271943 A1 EP 4271943A1
Authority
EP
European Patent Office
Prior art keywords
air blow
blow opening
fan
air
oven according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21911694.4A
Other languages
German (de)
English (en)
Inventor
Mehmet Baris Gocer
Erdem EROGLU
Ethem TEKE
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.)
Femas Metal Sanayi ve Ticaret AS
Original Assignee
Femas Metal Sanayi ve Ticaret AS
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 Femas Metal Sanayi ve Ticaret AS filed Critical Femas Metal Sanayi ve Ticaret AS
Publication of EP4271943A1 publication Critical patent/EP4271943A1/fr
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F24C15/325—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation electrically-heated
    • 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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat

Definitions

  • the invention relates to an oven equipped with multiple fans for air circulation in a cavity during the cooking operation and control method thereof.
  • One or more hot air circulation fan is provided in a cavity delimiting a cooking chamber to increase the heat transfer efficiency of electric heaters in cooking operation in baking ovens.
  • the air circulation fan which is in the structure of an axial fan, spreads the heat provided by the electric heaters adapted to the cavity to the food products on the tray disposed in the cooking chamber allowing heat transfer by forced convection.
  • Electric heaters are mounted on a base and/or top of the cavity. Additionally, electric heater in a ring structure is adapted to the cavity back wall surrounding the air circulation fan.
  • the hot air in the oven with air circulation fan is discharged through multiple openings, ensuring a uniform air flow on the tray.
  • ensuring uniform air distribution on the tray is a major design challenge, as the airflow generated by the axial blown fans discharged tangential from the impeller blades. Air flows in the cavity create turbulence by colliding with the inner wall of the cooking chamber and each other. Turbulence causes uneven cooking of food products placed in the muffle on a tray or grill. Therefore, the consequent chaotic result makes it difficult to predict the design parameters for a uniform air flow.
  • EP1780471 B1 discloses a cooking chamber to cook food therein, a driving fan arranged at a wall of the cooking chamber, and one or more driven fans arranged on a circumference of the driving fan, wherein the driving fan is connected with the drive motor which is installed at an outside of the rear wall of the cooking chamber, to rotate in accordance with an operation of the drive motor, and the driven fans are supported at the rear wall of the cooking chamber by use of bearing members, respectively, to rotate by air streams generated when the driving fan rotates.
  • the driving fan is located at a center of a rear wall of the cooking chamber, and the driven fans can be spaced apart from the driving fan by a predetermined distance.
  • the object of the invention is to provide homogeneous hot air distribution on the baking tray in ovens with more than one blowing fan.
  • the invention is an oven comprising a muffle confining a cooking chamber with two opposing lateral walls, an upper wall and an opposite lower wall, a partition wall provided therebetween; a blower provided behind the partition wall and a control unit connected to a motor of the blower with rotatably arranged multiple blades so as to drive in a cooking mode.
  • the oven further comprising a first air blow opening provided on the partition wall and allowing transfer of hot air from the blower, and a second air blow opening having a second center aligned asymmetrically with respect the horizontal axis passing through an imaginary a first center in the middle of the first air blow opening and disposed at a distance at the horizontal axis from the first air blow opening.
  • the second fan which has an asymmetrical alignment with respect to the horizontal axis passing through the first center, which is the geometric center of the first air blow opening, contributes to the homogeneous distribution of hot air in the cavity.
  • Asymmetrical alignment refers to an unequal placement of the second air blow opening in the plate.
  • the second air blow opening can be either partially above or below the horizontal axis, or it can be formed completely away from the horizontal axis so that it does not cross it.
  • the first air blow opening and the second air blow opening are provided at a distance from each other on the horizontal axis.
  • the first air blow opening and the second air blow opening may partially overlap or are preferably in the form of completely independent holes.
  • the blower has a corresponding first fan and a second fan adapted behind the partition wall such that transmitting hot air directly to the corresponding first air blow opening and the second air blow opening.
  • each air blow opening comprises dedicated motor and fan containing blades, and it is possible to blow air from the selected opening only by the control unit selectively activating the relevant fan motor.
  • the control of blowing hot air inside the muffle is simplified.
  • the first fan and the second fan are in the axial fan structure.
  • the axial fan occupies a small space behind the partition wall and is resistant to cooking temperatures, making it possible to perform the cooking operation.
  • a preferred embodiment of the invention a third air blow opening having an imaginary third center provided the partition wall asymmetrically in the horizontal axis against the first air blow opening and the second air blow opening.
  • blower is having a second and third air blow openings provided at the either side of the first air blow opening on the horizontal axis, and therefore first, second and third air blow opening apertures arrayed on or near a slope line in the partition wall. It has been monitored that this allocation enables the hot air conveyed by the blower to show laminar flow in the muffle.
  • blower is having a corresponding third fan adapted behind the partition wall so as to provide direct hot air transmission to the third air blow opening.
  • each opening of the blower assembly is equipped with a corresponding fan of its own.
  • Control unit to is able to operate each air blow opening jointly or independently in the blower.
  • the third center is substantially aligned on a center axis crossing between the first center and the second center. Alignment can be interpreted as being located directly on the center axis, as well as small deviations at acute angles are included in this expression.
  • the center axis ensures that the blower is arranged with a declination on the partition wall. This facilitates the distribution of hot air in the muffle both horizontally and vertically.
  • the blower is adjusted to rotate the blown air, and a deviation angle between the central axis with the horizontal axis is set essentially perpendicular to the tangential component of the outlet air. It has been observed that such an embodiment improves the laminar hot air distribution during baking, especially in the muffle containing a partition wall with a blower structure that rotates the blades of the motor in the blower and extracts the hot air from the opening in a rotary manner.
  • the second air blow opening and the third air blow opening are at a vicinity of both the first air blow opening on the one hand, and to the corresponding lateral wall on the other. In this way, the homogeneity of the air distribution of the blower in the transverse direction is improved.
  • the third fan is in the form of an axial fan.
  • the third air blow opening is controlled independently with the control unit and a compact blower is obtained.
  • the third fan is arranged to rotate in the same direction as the first and second fans.
  • the first, second and third air blow openings are a circular through hole cut-out from the partition wall, and the corresponding air blow openings of the first, second and third centers, respectively, are set as the radial center. Circular air blow openings provide radial outward distribution of air from the partition wall into the muffle.
  • the first, second and third air blow openings are in a grid structure.
  • the grill structure not only allows the passage of hot air, but also largely prevents the access of oil or similar foreign substances splashing from the oven to the blower.
  • the first air blow opening is arranged close to the upper wall and the third air blow opening is close to the lower wall. In this way, homogeneous air distribution is improved both above and below a tray or grill that is provided in the muffle transversely.
  • only the first air blow opening, the second air blow opening and the third air blow opening are disposed in the partition wall. Three air blow openings are placed in the muffle, one in the center, and the others in an asymmetrical arrangement accordingly, and a homogeneous distribution of hot air is obtained in the muffle.
  • a preferred embodiment of the invention includes a holding element is provided on one lateral wall of the muffle in opposite directions extending through the horizontal axis such that removably secure a baking tray by separating the muffle transversely extending from length to length.
  • the holder part may be a rib structure on the lateral wall of the muffle or a telescopic carrier structure attached to it with mounting elements. With the tray lying on the horizontal axis, homogeneous hot air distribution is optimized for a food cooked on the tray.
  • the first air blow opening is arranged in the middle of the partition wall. In this way, it is possible to circulate hot air in all directions inside the muffle with the first air blow opening.
  • the second air blow opening helps to obtain a homogeneous air flow by creating asymmetrical air movement by compensating the movement of the hot air moving in all directions from the first air blow opening, especially in the rotary direction.
  • a preferred embodiment of the invention includes the control method for an oven described above.
  • the control method includes the process step of driving a predetermined motor to operate an active blower selected from the group consisting of the first fan, the second fan and the third fan in a cooking operation when the cooking mode is enabled. Regardless of which fan is activated by the control unit a vacuum concurs, allowing air to enter from neighboring air blow openings. Thus, even in a cooking mode where only one fan operates, additional air inlets occur from the partition wall and the homogeneity of the hot air is improved.
  • Figure 1 is a front view of a representative embodiment of the oven according to the subject matter of the invention.
  • Figure 2 is the schematic representation of the hot air distribution in the muffle of the oven given in Figure 1 , wherein a cooking operation with all fans are activated, right and left single fan is activated and middle fan is activated, respectively.
  • a 90 cm wide oven is shown from the front in the open position in Figure 1.
  • the oven comprises a muffle (20) with a rim on a housing (1).
  • the muffle (20) is covered in the housing (1) by a hinged door (2) with air exhaust outlets (not shown).
  • the muffle (20) has a planar lower wall (27) delimiting a cooking chamber and a parallel upper wall (21 ), and lateral walls (23) covering them from the sides.
  • a flat partition wall (28) from end to end is provided in the rear part of the muffle (20) opposite the rim.
  • a first air blow opening (22) is formed in the middle of the partition wall (28) in the form of a circular hole.
  • a first center (m-i) with the first air blow opening (22) is the radial center is also the geometric center of the partition wall (28).
  • a holder part (25) is formed on the lateral walls (23) in the form of protrusions opposite to each other.
  • a tray (40) from its outer edge is disposed on the holding element (25) on a horizontal axis (x).
  • the horizontal axis (x) is an imaginary axis and also passes through the first center (m-i).
  • a second air blow opening (24) is in the same shape with the first blow opening (22) and is cut-out on the partition wall (28) in close proximity to a lateral wall (23).
  • a second center (m2) which is the radial center of the second air blow opening (24) passes through a center axis (m) which together with the first center (m-i) makes a incline angle (a) with the horizontal axis (x).
  • the second air blow opening (24) is aligned at the top on the horizontal axis (x) with respect to the first air blow opening (22).
  • a third air blow opening (26) is in the same shape with both the first and second air blow openings (22, 24) and is disposed in the partition wall (28) adjacent the first air blow opening (22) to be on the opposite side from the second air blow opening (24).
  • a third center (m3) which is the radial center of the third air blow opening (26) is located on the center axis (m) together with the first and second centers (mi, m2). In this way, the third air blow opening (26) remains below the first air blow opening (22) on the horizontal axis (x).
  • All three air blow openings (22, 24, 26) are in a grid structure, which is formed by arranging the openings extending towards the center in the radial direction and allowing air passage between them.
  • the flat tray (40) extends end to end between the lateral walls (23) of the muffle (20) dividing the cooking chamber. Food products are placed on the tray (40). When the tray (40) is viewed from a front section (42), it cuts the circular first air blow opening (22) from its middle approximately, the second air blow opening (24) from its upper part, and the third air blow opening (26) from its lower part.
  • a blower (30) comprises a motor (33) for the axial fan and radial blades (31) secured on the rotating shaft of each motor (33).
  • a first fan (32) is connected to the first air blow opening (22), a second fan (34) to the second air blow opening (24) and a third fan (36) to the third air blow opening (26) of the partition wall (28) wherein each fan of the blower (30) is identical to each other and provided behind the partition wall (28).
  • the first fan (32) rotates the motor (33) corresponding to the first air blow opening (22), the second fan (34) the second air blow opening (24) and the third air blow opening (36) to the third air blow opening (26) over with blades (31 ) in a rotary manner to directly supply air.
  • the motor (33) is driven by a connected control unit (10) in a printed circuit structure provided behind a control panel (3) on the oven housing (1) over an electrical cable.
  • the control unit (10) includes a central processor (12).
  • the operating mode of the oven is selected by the user with the help of an adjustment element (4) on the control panel (3). Accordingly, the processor (12) selects and runs the cooking algorithm from a memory module on the control unit (10).
  • the control unit (10) operates the first fan (32), the second fan (34) and/or the third fan (36) together or in different combinations according to the cooking algorithm. In this case, the control unit (10) simply supplies the relevant motor (33) with electricity and causes the blade (31) to be rotated.
  • the blade (31 ) rotates clockwise when viewed from the muffle (20) from the opposite side.
  • the central axis (m) has a 30-degree incline angle (a) to the left when viewed from the opposite side of the muffle (20) so as to form a component perpendicular to the tangential flow produced by the wing (31 ) component rotating clockwise.
  • the resistance against the tangential component is formed by the effect of the hot air supplied from the openings adjacent to the air blow opening (22, 24, 26) corresponding to the active fan (32, 34, 36) and the air distribution forced into the muffle (20) becomes homogeneous. This is illustrated in the heat dissipation graphs in Figure 2. In the graph in the left-hand direction, the blower (30) actively operates all the fans (32, 34, 36).
  • the hot air blown by rotating clockwise by the first air blow opening (22) is distributed on the tray (40) at a temperature that provides active cooking.
  • the air flow exiting the adjacent second air blow opening (24) and rotating in the same direction and the air flow exiting the third air blow opening (26) and rotating in the same direction form an interference pattern, preventing the formation of turbulence.
  • the hot air flow over the tray (40) is substantially laminar.
  • the second fan (34) and the third fan (36) are active.
  • the corresponding second air blow opening (24) and third air blow openings (26) are rotating in the same direction to inject air.
  • the first fan (32) does not operate due to the negative pressure created, air also enters through the first air blow opening (22). Thus, although it is not as homogeneous as the activation of all fans (32, 34, 36), a double-sided air flow is created and a distribution of hot air condensed in the direction of the arrow and suitable for cooking is obtained.
  • the graphic below only the first fan (32) is operating. In this case, the second air blow opening (24) adjacent to the first air blow opening (22) and the third air blow opening (26) supply air to the muffle (20) with the negative pressure formed.
  • passive areas are formed as a result of the interference of this air with the accelerated air transmitted from the first air blow opening (22), an improved homogeneous air distribution is obtained compared to a muffle with a single air inlet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Baking, Grill, Roasting (AREA)

Abstract

L'invention concerne un four comprenant un moufle (20) confinant une chambre de cuisson ayant deux parois latérales opposées (23), une paroi supérieure (21) et une paroi inférieure opposée (27), une paroi de séparation (28) étant disposée entre celles-ci ; un souffleur (30) disposé derrière la paroi de séparation (28), et une unité de commande (10) reliée à un moteur (33) du souffleur (30) avec de multiples pales (31) agencées de manière rotative de façon à entraîner dans un mode de cuisson. Le four comprend en outre une première ouverture de soufflage d'air (22) disposée sur la paroi de séparation (28) et permettant un transfert d'air chaud à partir du souffleur (30), et une seconde ouverture de soufflage d'air (24) ayant un second centre (m2) aligné de manière asymétrique par rapport à l'axe horizontal (x) passant par un premier centre imaginaire (m1) au milieu de la première ouverture de soufflage d'air (22) et disposée à distance au niveau de l'axe horizontal (x) par rapport à la première ouverture de soufflage d'air (22).
EP21911694.4A 2020-12-03 2021-01-22 Four à multiples ventilateurs et son procédé de commande Pending EP4271943A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2020/19677A TR202019677A2 (tr) 2020-12-03 2020-12-03 Çoklu fana sahip bir fırın ve bunun kontrol metodu
PCT/TR2021/050056 WO2022139712A1 (fr) 2020-12-03 2021-01-22 Four à multiples ventilateurs et son procédé de commande

Publications (1)

Publication Number Publication Date
EP4271943A1 true EP4271943A1 (fr) 2023-11-08

Family

ID=82160012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21911694.4A Pending EP4271943A1 (fr) 2020-12-03 2021-01-22 Four à multiples ventilateurs et son procédé de commande

Country Status (3)

Country Link
EP (1) EP4271943A1 (fr)
TR (1) TR202019677A2 (fr)
WO (1) WO2022139712A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200179867Y1 (ko) * 1999-11-17 2000-04-15 삼성전자주식회사 전자렌지
KR101249863B1 (ko) * 2005-10-31 2013-04-05 삼성전자주식회사 조리장치
US8138452B2 (en) * 2008-07-14 2012-03-20 Whirlpool Corporation Convection oven
CN108433572A (zh) * 2018-05-31 2018-08-24 福建工程学院 温度可控式电烤炉及其工作方法

Also Published As

Publication number Publication date
TR202019677A2 (tr) 2022-06-21
WO2022139712A1 (fr) 2022-06-30

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