Cooking device

Abstract

The invention relates to a cooking device for preparing food, comprising a cooking chamber (1) designed to receive the food, and an installation space (2) separated from the cooking chamber (1) by a partition (3), the installation space (2) being delimited by the partition (3) and a plurality of outer walls, and comprising a ventilation module, wherein an electric motor (10) of the ventilation module is provided in the installation space (2), and a ventilation wheel (21) of the ventilation module is provided in the cooking chamber (1); a shaft (11) of the ventilation module extends from the installation space (2) into the cooking chamber (1) through the partition (3), the shaft supporting a rotor (13) of the electric motor (10) and the ventilation wheel (21); the electric motor (10) includes, as a self-ventilated electric motor (10), a cooling fan wheel (16), which rotates together with the shaft (11) and is held on the shaft, and a stator (14), which surrounds the rotor (13); and in order to cool the installation space (2), the cooling fan wheel (16) provides a fresh air flow (8) through the electric motor (10) and / or along an outer face thereof in such a way that the fresh air is supplied through a fresh air supply opening (7), which is provided in an outer wall of the installation space (2), then flows through the electric motor (10), then exits the electric motor (10) into the surrounding installation space (2), and escapes from at least one outlet opening (6). The invention further relates to the use of an open-circuit air-cooled BLDC motor for driving a ventilation wheel (21) of a commercial cooking device.

Description

[0001]

[0002] Applicant: Hanning Elektro-Werke GmbH & Co. KG

[0003] Holter Street 90

[0004] 33813 Oerlinghausen

[0005] Our reference HAN2502PCT

[0006] Date: November 13, 2025

[0007] Cooking appliance

[0008] The invention relates to a cooking appliance intended for commercial use for preparing food, comprising a cooking chamber designed to hold the food and an installation space separated from the cooking chamber by a partition wall, which serves to hold functional components of the cooking appliance.

[0009] A commercially used cooking appliance today typically includes several external fans. These fans are mounted on an exterior wall of the installation room and are independently driven by electric motors. They supply fresh air and cool the functional components located within the installation room. In this way, the temperature in the installation room, which is adjacent to the cooking chamber, can be maintained at a level of approximately 60 to 80 °C.

[0010] Within the installation space, an electric motor of a ventilation module is installed as a functional component of the cooking appliance. This motor drives a ventilation wheel located in the cooking chamber. Like all other functional components within the installation space, the electric motor is cooled by the fresh air supplied by the external fans.

[0011] The object of the present invention is to provide a cooking appliance with improved cooling capabilities.

[0012] To solve this problem, the invention has the features of claim 1. Accordingly, the cooking appliance for preparing food comprises a cooking chamber for receiving the food and an installation chamber separated from the cooking chamber by a partition wall, which is bounded by the partition wall and a plurality of external walls. The cooking appliance further comprises a ventilation module, wherein an electric motor of the ventilation module is provided in the installation chamber and a ventilation wheel of the ventilation module is provided in the cooking chamber, and wherein a shaft of the ventilation module, which carries a rotor of the electric motor and the ventilation wheel, extends from the installation chamber through the partition wall into the cooking chamber. The electric motor of the ventilation module, being a self-ventilated electric motor, includes a cooling fan wheel rotating with and held on the shaft, and a stator surrounding the rotor.To cool the installation space, the cooling fan wheel of the electric motor provides a fresh air flow such that the fresh air is supplied through a fresh air supply opening, which is provided on an outer wall of the installation space, then flows through the electric motor and / or along it, then exits the electric motor into the surrounding installation space and / or is deflected and escapes from the installation space via at least one outlet opening formed on at least one outer wall.

[0013] An electric motor is considered self-ventilated within the meaning of the invention if it has a cooling fan rotating with the motor shaft, which provides an airflow through the electric motor and / or along an outer surface of the electric motor. A self-ventilated electric motor can therefore be internally ventilated and / or surface-cooled. A forced-draft, and thus internally ventilated, electric motor is preferred, as this design provides particularly effective cooling.

[0014] The particular advantage of the invention lies in the fact that by using the cooling fan wheel, which is mounted on the shaft of the electric motor, to supply fresh air into the installation space of the cooking appliance, the external fans and their electric drives currently required for this purpose can be eliminated or their number reduced, without the temperature in the installation space rising above the permissible limit of approximately 80 °C. The cooling fan wheel of the electric motor in the ventilation module, which previously served solely to cool the electric motor using the fresh air supplied to the installation space via the external fans, now additionally assumes the function of supplying fresh air and also continues to serve for internal ventilation and cooling of the electric motor. Eliminating the external fans, or at least reducing their number, results in a significant cost advantage.Furthermore, less installation space is required for the functional components of the cooking appliance. Therefore, while maintaining the external dimensions of the cooking appliance, the cooking chamber can be enlarged at the expense of installation space, or, while maintaining the size of the cooking chamber, the installation space, and thus the cooking appliance as a whole, can be made smaller and more compact.

[0015] According to a preferred embodiment of the invention, the cooking appliance includes a fresh air duct that leads from the fresh air supply to the electric motor. Advantageously, the fresh air can be drawn into the electric motor through the fresh air duct in a targeted manner and with minimal loss. The fresh air cooling of the electric motor is thus designed to be highly effective, and flow losses can be avoided or reduced.

[0016] For example, the fresh air duct can be integrally formed with the exterior wall of the installation room, which contains the fresh air supply opening, or even be designed as part of it. In particular, the fresh air duct and the exterior wall with the fresh air supply opening can be manufactured in a single production step using sheet metal forming, deep drawing, or similar processes. This advantageously reduces the number of parts and the logistical effort. Furthermore, assembly is simplified, as there is no need for a spatial separation between the fresh air duct and the exterior wall or fresh air supply opening.

[0017] According to a further development of the invention, the electric motor of the ventilation module, which serves to drive the ventilation wheel, is designed as a BLDC motor.

[0018] A key advantage of BLDC motors is the relatively large spacing between adjacent stator coils, which allows for effective internal ventilation, making them particularly well-suited for this purpose. Furthermore, BLDC motors are ideal for driving the fan wheel of a cooking appliance, as the drive can be variable in speed and direction. This offers numerous advantages and greater flexibility in food preparation.

[0019] In a further development of the invention, fresh air is guided axially through the electric motor, then deflected and exited radially. Advantageously, the axial guidance of the fresh air through the electric motor results in very effective cooling of the motor. The subsequent deflection of the fresh air and its radial exit from the electric motor then ensure that the now partially warmed fresh air is distributed throughout the surrounding installation space, allowing for uniform cooling.

[0020] According to a further development of the invention, the electric motor of the ventilation module has a motor cap with fresh air passages on a rear side facing away from the cooking chamber and towards the fresh air supply opening. Preferably, the fresh air duct is routed from the fresh air supply openings to these fresh air passages in the motor cap. Advantageously, the fresh air thus effectively enters the interior of the electric motor. At the same time, the motor cap protects the internal functional components of the electric motor from damage, for example, by foreign objects that are carried in by the fresh air flow, as well as from unintentional contact.

[0021] In a further development of the invention, the fresh air duct is designed to also partially surround or accommodate the motor housing. This advantageously simplifies the connection of the fresh air duct to the electric motor. Furthermore, some of the fresh air can be directed from the outside along the housing of the electric motor, thus further improving cooling.

[0022] In a further development of the invention, the electric motor of the ventilation module is fixed to the partition wall provided between the installation space and the cooking chamber. The fan wheel is preferably located between the rotor of the electric motor and the partition wall, or directly adjacent to the partition wall. Advantageously, by positioning the cooling fan wheel between the rotor and the partition wall, a draft of air can be provided through the electric motor when fresh air is supplied from the rear. The cooling fan wheel draws the fresh air through the fresh air supply opening and the fresh air duct into the motor interior and then blows it radially out into the surrounding installation space.

[0023] In a further development of the invention, the installation space serves to accommodate additional functional components of the cooking appliance. These additional functional components can include, for example, control electronics for the cooking appliance and / or heating components for heating the cooking chamber. The additional functional components are installed in the space in such a way that the fresh air exiting the electric motor is guided along these components before escaping the space, thus cooling them. Advantageously, this method allows for particularly effective cooling of the additional functional components by means of the fresh air supplied by the cooling fan of the electric motor. The number of externally driven fans can therefore be further reduced, or even eliminated entirely.Optionally, guiding elements can be provided to direct the partially heated fresh air exiting the electric motor to the other functional components and / or the at least one outlet opening.

[0024] According to a further development of the invention, the at least one outlet opening and the fresh air supply opening are spaced apart from each other. Preferably, they are located on different outer walls of the installation space. For example, a rear wall of the installation space provides the fresh air supply opening, while a side wall of the installation space has the at least one outlet opening. Advantageously, by spaced apart the fresh air supply opening and the at least one outlet opening, it can be ensured that the fresh air exiting through the outlet opening, which has been heated after cooling the electric motor and / or the other functional components, is not drawn back in through the fresh air opening and thus reduces the cooling effect.

[0025] To solve this problem, the invention provides for the use of a forced-air-ventilated BLDC motor to drive a ventilation wheel of a commercial cooking appliance. The BLDC motor comprises a shaft and a cooling fan wheel rotatable with the shaft, which provides the fresh air flow through the BLDC motor. The fresh air flow is guided axially through the BLDC motor. A comparatively large distance between adjacent coils of the stator of the BLDC motor, defined in a circumferential direction, promotes effective internal ventilation and cooling.

[0026] Further advantages, features, and details of the cooking device according to the invention can be found in the dependent claims, the drawings, and the following description. Features mentioned therein can be essential to the invention individually or in any combination. Thus, the disclosure relating to the individual aspects of the invention can always be referenced reciprocally. The drawings serve only as examples to clarify the invention and are not intended to be limiting.

[0027] They show:

[0028] Fig. 1 shows a partial sectional view of a cooking appliance in a first embodiment variant,

[0029] Fig. 2 shows a partial sectional view of the cooking appliance in a second embodiment and

[0030] Fig. 3 shows a partial sectional view of the cooking appliance in a third design variant.

[0031] A cooking appliance designed for commercial use, as shown in Fig. 1, comprises a cooking chamber 1 for receiving and preparing food and an installation chamber 2 separated from the cooking chamber 1 by a thermally insulating partition 3. The installation chamber 2 is bounded by the partition 3 and several external walls. Of these external walls, a rear wall 4 and a side wall 5 are shown in Fig. 1. Not shown are, in particular, another side wall, a top wall, and a bottom wall. The installation chamber 2 serves to house functional components of the cooking appliance. An electric motor 10 and an electronic module 17, which, for example, serves to control the electric motor 10 and / or other functional components of the cooking appliance not shown here, are shown by way of example.

[0032] The electric motor 10 is part of a ventilation module of the cooking appliance. In addition to the electric motor 10, the ventilation module comprises a ventilation wheel 21 located in the cooking chamber 1 and a shaft 11, which carries a rotor 13 of the electric motor 10 and the ventilation wheel 21. The shaft 11 extends axially 12 from the installation space 2 through the partition 3 into the cooking chamber 1.

[0033] The electric motor 10 is designed as an internally ventilated electric motor 10 of the BLDC type. It includes a cooling fan wheel 16 rotating on and held on the shaft 11, a stator 14 encompassing the rotor 13, and a housing 15 encompassing the stator 14. Furthermore, the electric motor 10 provides a first bearing shield 19 and a second bearing shield 20 to support the shaft 11, each of which, for example, has a rolling bearing. Additionally, a motor cover 18 is provided on the rear side of the electric motor 10, facing away from the ventilation wheel 21. The motor cover 18 has fresh air passages.

[0034] Furthermore, the electric motor 10 provides mounting brackets 23, which are arm-like and serve to secure the electric motor 10 to the partition wall 3. The cooling fan wheel 16, which rotates with the shaft 11, is installed between the rotor 13 and the partition wall 3.

[0035] To cool the electric motor 10 and the other functional components of the cooking appliance and to achieve a temperature in installation space 2 significantly below the temperature in cooking chamber 1, cool fresh air from the environment is supplied to installation space 2. A fresh air inlet 7 is provided on the rear wall 4 of installation space 2 for this purpose. The electric motor 10 is positioned in installation space 2 such that the rear motor cover 18 faces the fresh air inlet 7. A fresh air duct 9 is formed between the fresh air inlet 7 and the motor cover 18. Fresh air is supplied to installation space 2 during operation of the electric motor 10. This is caused by the cooling fan 16 of the electric motor 10, which rotates with the shaft 11. The rotating cooling fan 16 creates a fresh air flow 8, which draws the fresh air in through the fresh air inlet 7.The fresh air then flows through the fresh air duct 9 and the electric motor 10 in the axial direction 12. From the electric motor 10, the now partially heated fresh air exits radially and thus enters the surrounding installation space 2. From there, it escapes through a plurality of outlet openings 6, which in this example are designed as slits and are provided on the side wall 5.

[0036] The cooling fan 16 of the electric motor 10 thus provides cooling air to the electric motor 10. At the same time, it deflects the fresh air flow 8 from the axial direction 12 into a radial direction 22. Due to the design of the electric motor 10, adjacent coils of the stator 14 are spaced apart from each other. Fresh air flows between the adjacent coils and cools the electrically active parts of the electric motor 10.

[0037] The partially heated fresh air exiting radially from the electric motor 10 serves not only to cool the electric motor 10 but also to cool the other functional components of the cooking appliance. The electronic module 17, which is surrounded and cooled by the fresh air flow 8, is shown here as an example. Depending on the performance of the electric motor 10 and the cooling fan wheel 16, the cooking appliance may not require additional electrically driven fans, or their number may be reduced.

[0038] In the first embodiment of the invention shown in Fig. 1, the fresh air duct 9 is directly integrated into the fresh air supply opening 7 and is implemented as part of the rear wall 4. It leads to the rear motor cap 18 provided in the electric motor 10. The fresh air flows into the interior of the electric motor 10 through the fresh air passages provided in the motor cap 18. While the fresh air duct 9 extends in the axial direction 12, the rear wall 4 extends perpendicular to this direction.

[0039] While in the first embodiment of the invention according to Fig. 1 a transition area formed between the fresh air duct 9 and the rear wall 4 is essentially rectangular or sharp-edged, the second embodiment of the cooking appliance shown in Fig. 2 provides a transition radius with which the fresh air duct 9 transitions into or opens into the rear wall 4.

[0040] The provision of the transition radius reduces turbulence during the intake of fresh air. Furthermore, the transition radius simplifies the one-piece manufacturing of the fresh air duct 9 and the rear wall 4 by means of sheet metal forming.

[0041] Apart from the different design of the fresh air duct 9, the construction of the cooking appliance according to the second and third versions corresponds to the first version.

[0042] Fig. 3 shows the cooking appliance in a third embodiment. The fresh air duct 9 has been modified again. In this third embodiment, the fresh air duct 9 is widened. The electric motor 10, with its end cap 18, projects into the fresh air duct 9. The fresh air supplied via the fresh air duct 9 thus enters the interior of the electric motor 10 as before. Furthermore, the electric motor 10, particularly in the area of ​​the end cap 18 and the motor housing 15, can be cooled by external airflow.

[0043] Identical components and component functions are identified by the same reference symbols.

[0044] marked. Reference list

[0045] 1 cooking chamber

[0046] 2 Installation space

[0047] 3 Partition wall

[0048] 4 Back panel

[0049] 5 side wall

[0050] 6 Outlet opening

[0051] 7 Fresh air supply opening 8 Fresh air flow 9 Fresh air duct

[0052] 10 Electric motor

[0053] 11th wave

[0054] 12 Axial direction

[0055] 13 Rotor

[0056] 14 Stator

[0057] 15 cases

[0058] 16 Cooling fan wheel

[0059] 17 Electronic module

[0060] 18 Engine cap

[0061] 19 Warehouse sign

[0062] 20 Storage sign

[0063] 21 Ventilation wheel

[0064] 22 Radial direction

[0065] 23 mounting brackets

Claims

Patent claims 1. Cooking appliance for preparing food comprising a cooking chamber (1) designed to hold the food and an installation chamber (2) separated from the cooking chamber (1) by a partition (3), wherein the installation chamber (2) is bounded by the partition (3) and a plurality of external walls, and comprising a ventilation module, wherein an electric motor (10) of the ventilation module is provided in the installation chamber (2) and a ventilation wheel (21) of the ventilation module is provided in the cooking chamber (1), and wherein a shaft (11) of the ventilation module, which carries a rotor (13) of the electric motor (10) and the ventilation wheel (21), extends from the installation chamber (2) through the partition (3) into the cooking chamber (1), wherein the electric motor (10) is a self-ventilated electric motor, and the electric motor (10) includes a cooling fan wheel (16) rotating with and held on the shaft (11) and a fan wheel (13) that drives the rotor (13). provides for a surrounding stator (14),wherein the cooling fan wheel (16) provides a fresh air flow (8) through the electric motor (10) and / or along an outer surface thereof for cooling the installation space (2) such that the fresh air is supplied through a fresh air supply opening (7) which is provided on an outer wall of the installation space (2), then flows through and / or around the electric motor (10), then exits from the electric motor (10) into the surrounding installation space (2) and / or is deflected and escapes through at least one outlet opening (6).

2. Cooking appliance according to claim 1, characterized in that a fresh air duct (9) is led from the fresh air supply opening (7) to the electric motor (10).

3. Cooking appliance according to claim 2, characterized in that the fresh air duct (9) is formed on the outer wall of the installation space (2) having the fresh air supply opening (7) and / or is designed as a part thereof.

4. Cooking appliance according to one of claims 1 to 3, characterized in that the electric motor (10) of the ventilation module is designed as a BLDC motor.

5. Cooking appliance according to one of claims 1 to 4, characterized in that the fresh air is guided axially through the electric motor (10) and / or exits radially from it.

6. Cooking appliance according to one of claims 1 to 3, characterized in that the electric motor (10) provides a motor cap (18) with fresh air passages on a rear side facing away from the cooking chamber (1) and / or towards the fresh air supply opening (7) and / or the fresh air duct (9).

7. Cooking appliance according to claim 6, characterized in that the fresh air duct (9) accommodates the motor cap (18) at least section by section.

8. Cooking appliance according to one of claims 1 to 7, characterized in that the outlet opening (6) is designed in a slotted shape and that preferably several slotted outlet openings (6) are provided.

9. Cooking appliance according to one of claims 1 to 8, characterized in that the partition wall (3) provided between the installation space (2) and the cooking chamber (1) is designed as a thermally insulating partition wall (3).

10. Cooking appliance according to one of claims 1 to 9, characterized in that the electric motor (10) is fixed to the partition (3).

11. Cooking appliance according to one of claims 1 to 10, characterized in that the cooling fan wheel (16) is provided between the rotor (13) of the electric motor (10) and the partition (3) and / or adjacent to the partition (3).

12. Cooking appliance according to any one of claims 1 to 11, characterized in that further functional components of the cooking appliance are installed in the installation space (2) such that the fresh air exiting and / or deflected from the electric motor (10) is guided along the further functional components before escaping from the installation space (2) and cools them.

13. Cooking appliance according to any one of claims 1 to 12, characterized in that the fresh air supply opening (7) and the at least one outlet opening (6) are spaced apart from each other and are preferably formed on different outer walls of the installation space (2), and that the fresh air supply opening (7) is particularly preferably provided on a rear wall (4) of the installation space (2) and the outlet opening (6) on a side wall (5) of the installation space (2).

14. Use of a forced-air BLDC motor comprising a shaft (11) and a cooling fan wheel (16) rotating with the shaft (11) and providing a fresh air flow (8) through the BLDC motor for driving a ventilation wheel (21) of a commercial cooking appliance.

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