Cooking appliance

Abstract

Cooking appliance for cooking food with 1.1.a cooking chamber (1), 1.2.an inductively heated fan wheel (8) arranged in the cooking chamber (1) and 1.3.an induction element (7) for inductive heating of the fan wheel (8), 1.4.whereby the induction element (7) is arranged outside the cooking chamber (1), 1.5.whereby the fan wheel (8) can be removed from the cooking chamber (1) without tools.

Description

[0001] The invention relates to a cooking appliance for cooking food. The invention also relates to a cooking chamber for such a cooking appliance.

[0002] A cooking appliance with a fan wheel is known, for example, from WO 2018 / 116 059 A1.

[0003] EP 1 130 336 A2 discloses a highly efficient fluid heating device.

[0004] There is a continuous need to improve such a cooking appliance and a cooking chamber for such a cooking appliance.

[0005] These problems are solved by the present invention.

[0006] One aspect of the invention is to arrange the induction element for inductive heating of the fan wheel outside the cooking chamber in a cooking appliance with an inductively heated fan wheel.

[0007] The induction element, particularly in the form of an induction coil, is located outside the area within the cooking appliance where cooking fumes can enter. The induction element can, in particular, be located outside a so-called muffle.

[0008] The fan wheel can be removed from the cooking chamber without tools. It can be removed from the cooking chamber particularly for cleaning purposes. The fan wheel can be attached to a mounting bracket, in particular by locking it into place.

[0009] According to a further aspect of the invention, in particular the boundary wall of the cooking chamber, which is arranged between the induction element for inductive heating of the fan wheel and the fan wheel, is designed to be electrically non-conductive and / or non-magnetizable.

[0010] The cooking chamber may, in particular, have a rear wall made of a dielectric, non-conductive material. It may, in particular, have a rear wall made of a non-magnetizable material. The rear wall of the cooking chamber is, in particular, at least partially made of an electrically non-conductive and / or non-magnetizable material.

[0011] This aspect can be advantageous regardless of further details of the invention. It makes it possible to design the cooking chamber in such a way that it does not act as a Faraday cage. The cooking chamber can, in particular, be made of a dielectric material, such as Teflon, ceramic, or plastic. The cooking chamber can also have an insert made of dielectric material in at least one wall, especially in the rear wall. The insert is, in particular, tightly, and preferably vapor-impermeable, connected to the cooking chamber wall.

[0012] The partition is made of a heat-resistant, dishwasher-safe material. It may have a coating, particularly a catalytic one. This effectively prevents soiling of the partition. It may also have self-cleaning properties.

[0013] The fan wheel is made primarily of a ferromagnetic material. At least in some areas, it is made of a ferromagnetic material.

[0014] According to one aspect of the invention, the fan wheel has an area power density of more than 15 W / cm². 2 , in particular at least 20 W / cm² 2 , in particular at least 30 W / cm² 2 , in particular at least 50 W / cm² 2 . These specifications refer to the maximum surface power density with which the fan wheel can be heated.

[0015] The fan wheel allows a maximum heating output of at least 3 kW, in particular at least 5 kW, and in particular at least 7 kW to be introduced into the cooking chamber. This enables quick and flexible heating of the cooking chamber. Lower heating outputs are also possible. The heating output can be applied to the cooking chamber in a constant, non-pulsating manner, ensuring very even heating. This is particularly advantageous for low-temperature cooking.

[0016] According to another aspect of the invention, the fan wheel is provided with a grease filter and / or a catalytic coating.

[0017] This effectively prevents the fan wheel from becoming dirty.

[0018] According to another aspect, resistance heating elements, especially heating coils, can be completely dispensed with in the cooking chamber. The cooking chamber can, in particular, be designed without heating coils.

[0019] This makes cleaning the cooking chamber easier. It also prevents unpleasant odors caused by dirt buildup on the heating elements.

[0020] Another feature is the presence of a fresh water nozzle in the cooking chamber. This nozzle supplies fresh water to the chamber, which can be used for steam generation or cleaning.

[0021] In the case of steam generation, the fresh water can first be preheated in the cooking appliance. It can also be used, particularly before being supplied to the cooking chamber, as a cooling medium for a cooling device, especially for cooling the electrical components of the cooking appliance and / or for cooling the outer housing of the cooking appliance and / or for cooling an exhaust air stream.

[0022] The fresh water may pass through a cooling device, in particular a cooling circuit, especially before being fed into the cooking chamber.

[0023] Fresh water can be supplied to the cooking chamber in a controlled manner. This can be achieved using a supply system with a pump and / or a valve.

[0024] The cooking appliance may, in particular, have a single fresh water nozzle in the cooking chamber. This can serve both to supply water for steam generation in the cooking chamber and to supply water and / or cleaning fluid for cleaning the cooking chamber.

[0025] The water can be sprayed onto the fan wheel using the fresh water nozzle. It can be sprayed from the back of the cooking chamber towards the front of the fan wheel. Alternatively, the water can be sprayed onto the fan wheel from the front.

[0026] The sprayed water can evaporate on the heated fan wheel. It can also be carried along by the fan wheel and distributed throughout the cooking chamber. To improve water distribution within the cooking chamber, the fan wheel may have special water-distributing elements or features.

[0027] According to another aspect of the invention, the fan wheel and the attachment part are at least partially, in particular only partially or in particular completely, made of a ferromagnetic material.

[0028] This results in the fan wheel being particularly well suited for inductive heating.

[0029] According to one aspect of the invention, the fan wheel is arranged behind a partition wall located in the rear area of ​​the cooking chamber. The partition wall has a recess adapted to the fan wheel, particularly in the area of ​​the fan wheel. The partition wall ensures a circulating airflow within the cooking chamber. In particular, it ensures that no dead zones form within the cooking chamber. The cooking chamber is thus free of dead zones with regard to the circulating airflow.

[0030] According to a further aspect of the invention, the partition wall can be removed from the cooking chamber for cleaning purposes. It can be removed from the cooking chamber without tools. In particular, it can be removed from the cooking chamber reversibly.

[0031] Another objective of the invention is to improve a cooking chamber for a cooking appliance.

[0032] The problem is solved by a cooking chamber with walls that define the outer boundaries of the cooking chamber, wherein at least one of the walls is formed, at least partially, from a dielectric material. Preferably, the rear wall is formed, at least partially, from a dielectric material. Alternatively, at least one side wall, the bottom wall, and / or the ceiling wall is formed from a dielectric material. Alternatively, the entire cooking chamber can be formed from a dielectric material.

[0033] Alternatively, an insert made of dielectric material can be used. The insert can, for example, cover the entire surface, i.e., an entire wall of the cooking chamber. Alternatively, the insert can only cover a portion of a wall of the cooking chamber.

[0034] Examples of dielectric materials are Teflon, ceramics, or plastics.

[0035] A wall or insert made of a dielectric material is advantageous for inductively heating the fan wheel using an induction element. A direct connection to the fan wheel, such as an electrical connection, is not necessary.

[0036] Further aspects, details, and advantages of the invention will become apparent from the description of exemplary embodiments with reference to the figures. These show: Fig. 1 schematically a cooking chamber with an inductively heated fan wheel, Fig. 2 an exemplary top view of a fan wheel, Fig. 3 schematically a cross-section along lines III-III through the fan wheel according to Fig. 2,

[0037] The in Fig. The cooking chamber 1 shown in Figure 1 is bounded by a muffle 2. The muffle 2 comprises a rear wall 3, a ceiling wall 4, a bottom wall 5, a front wall 6, and two side walls (not shown). The front wall 6 includes a cooking chamber opening, which can be reversibly closed by a cooking chamber door and through which the cooking chamber 1 can be loaded and unloaded.

[0038] An induction element 7 is arranged on the rear wall 3. The induction element 7 is located on the side of the rear wall 3 facing away from the cooking chamber 1. Alternatively, the induction element 7 can be located on the side of the rear wall 3 facing the cooking chamber 1. In this case, the induction element 7 is designed as an induction coil.

[0039] A fan wheel 8 is arranged in the cooking chamber 1. The fan wheel 8 is arranged parallel to the rear wall 3. The fan wheel 8 is rotationally fixed to a drive shaft 9. The drive shaft 9 extends through the rear wall 3 and out of the cooking chamber 1. The drive shaft 9 can be supported in the rear wall 3 by a fixed or floating bearing. Alternatively, the drive shaft 9 can extend through an opening in the rear wall 3. In this case, the drive shaft 9 is not in operative contact with the rear wall 3. The opening can be sealed by a non-contact seal, such as a labyrinth seal. The fan wheel 8 is connected to the drive shaft 9 in a way that allows for tool-free detachment. The fan wheel 8 can be connected to the drive shaft 9 by a suitable connection, such as a screw connection, a plug connection, a flange connection, a bayonet connection, or similar.

[0040] The drive shaft 9 is rotationally fixed to a motor 10. The motor 10 transmits a rotational movement via the drive shaft 9 to the fan wheel 8. The motor 10 can be a DC motor. The motor 10 can be an AC motor. The motor 10 can have contact brushes. The motor 10 can be brushless. The motor 10 can be detachable from the drive shaft 9. The drive shaft 9 can be connected to the motor 10 via a suitable connection, such as a screw connection, a plug connection, a flange connection, a bayonet connection, or similar. Alternatively, the motor 10 can be permanently connected to the drive shaft 9, in particular by bonding, gluing, or welding.

[0041] The fan wheel 8 is ferromagnetic. It is heated by the induction element 7. The fan wheel 8 can thus be the sole heat source for the cooking appliance. This heating method eliminates the need for complex and difficult-to-clean heating elements in the muffle. The fan wheel 8 can generate a heat output with a surface power density of more than 15 W / cm². 2 to be placed in cooking chamber 1.

[0042] The back wall 3 is made of a dielectric material. The back wall 3 is preferably made of Teflon or ceramic. The back wall 3 can be made entirely of the dielectric material. The back wall 3 can also have an insert made of the dielectric material. The insert is preferably at least as large as the induction element 7. Alternatively, the entire muffle 2 can be made of the dielectric material.

[0043] A grease filter 11 is provided in the cooking chamber 1. The grease filter 11 is preferably arranged between the cooking chamber opening and the fan wheel 8. Preferably, the grease filter 11 is arranged at a minimal distance from the fan wheel 8. The distance between the grease filter 11 and the fan wheel 8 is preferably in the range of 10 cm and 0.1 mm, particularly in the range of 5 cm and 0.5 mm, and especially in the range of 3 cm to 1 cm. The grease filter 11 is preferably attached to an intermediate wall (not shown). Alternatively, the grease filter 11 can be attached to the muffle 2 via a fastening element. Alternatively, the grease filter 11 can be attached to the fan wheel 8 via a fastening element. The grease filter 11 is preferably designed to be replaceable, in particular replaceable without tools.

[0044] The grease filter 11 and / or the fan wheel 8 may have a catalytic coating. Alternatively, the grease filter 11 can be replaced by a pure catalyst.

[0045] A fresh water nozzle 12 is also arranged in the rear wall 3. The fresh water nozzle 12 is directed towards the fan wheel 8. Fresh water is introduced via the fresh water nozzle 12 to generate steam and / or to clean the cooking chamber 1. The fan wheel 8 can be designed such that the fresh water is distributed throughout the entire cooking chamber 1, preferably evenly.

[0046] In Fig. 2 and Fig.Figure 3 shows the fan wheel 8. The fan wheel 8 comprises an approximately cylindrical base element 13. The base element 13 has a through-hole 14. The through-hole 14 can be covered by a cover cap (not shown). The fan wheel 8 can be mounted onto the drive shaft 9 via the through-hole 14, particularly without tools. The fan wheel 8 is preferably reversibly detachable from the drive shaft 9. A base plate 15, preferably a fixed, circular one, is attached to the base element 13. The base plate 15 is preferably permanently connected to the base element 13. Alternatively, the base plate 15 can be detachably connected to the base element 13.

[0047] Fan blades 16 are mounted on the base plate 15. The fan blades 16 are preferably evenly distributed around the circumference of the fan 8. The fan blades 16 are preferably arranged perpendicularly on the base plate 15. Alternatively, the fan blades 16 can be arranged at an angle on the base plate 15. The angle between the fan blades 16 and the base plate 15 can be between 0° and 90°, in particular between 15° and 85°, in particular between 30° and 80°, and in particular between 45° and 75°. The fan blades 16 are connected to the base plate 15 by spot welds 17. The fan blades 16 can be detachably or permanently connected to the base plate 15. The fan wheel blades 16 can be connected to the base plate 15 in particular by gluing, welding, screwing, bolting or riveting.

[0048] An additional outer ring 18 is attached to the fan blades 16. The outer ring 18 is arranged offset from the base plate 15 in the axial direction of the drive shaft 9. The outer ring 18 is arranged closer to the cooking chamber opening than the base plate 15. The outer ring 18 and the base plate 15 are preferably arranged parallel to each other. The outer ring 18 may be arranged at an angle to the base plate 15. The outer ring 18 is connected to the fan blades 16 by means of spot welds 19. The outer ring 18 may be connected to the fan blades 16 either detachably or permanently. The outer ring 18 may be connected to the fan blades 16 by means of adhesive bonding, welding, screws, bolts, or rivets.

Claims

[1] Cooking appliance for cooking food with 1.1.a cooking chamber (1), 1.2.an inductively heated fan wheel (8) arranged in the cooking chamber (1) and 1.3.an induction element (7) for inductive heating of the fan wheel (8), 1.4.whereby the induction element (7) is arranged outside the cooking chamber (1), 1.5.whereby the fan wheel (8) can be removed from the cooking chamber (1) without tools. [2] Cooking appliance according to claim 1, characterized by , that the cooking chamber (1) has at least in an area adjacent to the fan wheel (8) a wall (3) made of a dielectric material. [3] Cooking appliance according to one of the preceding claims, characterized by , that the fan wheel (8) has an area power density of more than 15 W / cm² 2 It is heated. [4] Cooking appliance according to one of the preceding claims, characterized by, that the fan wheel (8) is provided with a grease filter (11) and / or a catalytic coating. [5] Cooking appliance according to one of the preceding claims, characterized by , that a fresh water nozzle (12) is arranged in the cooking chamber (1). [6] Cooking appliance according to one of the preceding claims, characterized in that the fan wheel is arranged behind a partition wall which is located in the rear area of ​​the cooking chamber. [7] Cooking appliance according to claim 6, characterized by that the partition wall can be removed from the cooking chamber without tools.

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