Cooling system for a cooking oven The present invention relates to a cooling system for a cooking oven. Further, the present invention relates to a cooking oven with a cooling system.

Pyrolytic cleaning is often used in modern cooking ovens. During pyrolytic cleaning the oven cavity is heated up to about 500°C. At such high temperatures remains of dirt on the inner surfaces of the oven cavity are burnt. After the pyrolytic cleaning the remaining organic substances can easily be swept out by a cloth. There are steamer ovens and microwaves ovens suitable for pyro ^¬ lytic cleaning. However, the most cooking ovens comprise temperature-sensitive components. It would be advantageous to cool sufficiently the entire cooking oven. It is an object of the present invention to provide a cooling system for a cooking oven, which allows a sufficient cooling of the entire cooking oven by low complexity.

The object is achieved by the cooling system according to claim 1.

According to the present invention a cooling system for a cooking oven is provided, wherein

the cooling system comprises a first air path including a first suction area, at least one first fan and a first air guidance of a blowing-out area connected in series,

the cooling system comprises a second air path including a second suction area, at least one second fan and a second air guidance of the blowing-out area connected in series, the first suction area is connected to an oven cavity of the cooking oven via an vapour outlet, so that the first air path is provided for conveying moist air, and

the second suction area is connected to the environment of the cooking oven, so that the second air path is provided for conveying dry air.

The core of the present invention is the cooling system with two separate air paths. Moist air is conveyed by one air path, while dry air is conveyed by the other air path. The separation of moist and dry air allows that moisture-sensitive components to be cooled are treated from moist air and cooled by dry air only.

Preferably, the cooling system is provided for a microwave oven or a cooking oven with microwave heating function.

Further, the cooling system may be provided for a cooking oven with pyrolytic cleaning function.

In particular, the cooling system is arranged or arrangeable above the oven cavity of the cooking oven, wherein preferably the cooling system is arranged or arrangeable close to a heating element inside the oven cavity of the cooking oven.

Further, the blowing-out area may be subdivided into the first air guidance and the second air guidance.

Preferably the cross-sections of the blowing-out area, the first air guidance, the second air guidance increase in direction of the air flow.

For example, the first suction area is connected or connectable to a cooling channel inside an oven door of the cooking oven. In particular, at least one of the fans is a radial fan.

Furthermore, a first fan wheel of the first fan and a second fan wheel of the second fan may comprise a common axis of rotation, wherein preferably said axis of rotation is vertical.

Moreover, the first fan and second fan may be arranged one upon the other, wherein preferably the second fan is arranged above the first fan.

For example, the cooling system comprises at least one front outlet opening connected to the blowing-out area, wherein pref ^¬ erably said front outlet opening is arranged or arrangeable at the front side of the cooking oven.

Additionally, the cooling system comprises at least one front inlet opening connected to the first suction area, wherein pref ^¬ erably said front inlet opening is arranged or arrangeable at a front frame enclosing the oven cavity of the cooking oven.

Further, the present invention relates to a cooking oven with a cooling system mentioned above.

The cooking oven may be a microwave oven or a cooking oven with microwave heating function.

Moreover, the cooking oven may include a pyrolytic cleaning function . Novel and inventive features of the present invention are set forth in the appended claims.

The present invention will be described in further detail with reference to the drawings, in which FIG 1 illustrates a schematic sectional side view of a cooking oven including a cooling system according to a preferred embodiment of the present invention, and

FIG 2 illustrates a schematic sectional top view of the cooking oven including the cooling system according to the preferred embodiment of the present invention. FIG 1 illustrates a schematic sectional side view of a cooking oven 10 including a cooling system 12 according to a preferred embodiment of the present invention.

The cooking oven 10 includes an oven cavity 14 and an oven door 18 at the front side of said oven cavity 14. A loading opening of the oven cavity 14 is closable by the oven door 18. A heating element 16 is arranged within an upper portion of the oven cavity 14. The cooling system 12 is arranged above the oven cavity 14.

The cooling system 12 comprises a first fan wheel 20 and a sec ^¬ ond fan wheel 22. In this example, the second fan wheel 22 is arranged above the first fan wheel 20. The first fan wheel 20 is driven by a first motor 24, while the second fan wheel 22 is driven by a second motor 26. Alternatively, the first fan wheel 20 and the second fan wheel 22 may be driven by a common motor. The first fan wheel 20 forms a first fan 20, while the second fan wheel 22 forms a second fan 22. In this example, the fans 20 and 22 are radial fans.

Further, the cooling system 12 comprises a first suction area 28 and a blowing-out area 30. The blowing-out area 30 is arranged above the first suction area 28. The first fan wheel 20 and the second fan wheel 22 are arranged inside the blowing-out area 30. A vapour outlet 32 is interconnected between the oven cavity 14 and the first suction area 28. The first suction area 28 is in ^¬ terconnected between an inlet of the first fan 20 and a front inlet opening 38. Said front inlet opening 38 is arranged in a front frame enclosing a front opening of the oven cavity 14. Further, a front outlet opening 40 is arranged in said front frame and above the front inlet opening 38. In a closed state of the oven door 18, the front inlet opening 38 is connected to a cooling channel 36 extending inside the oven door 18. The cool- ing channel 36 of the oven door 18 is connected to a door inlet opening 34. In this example, the door inlet opening 34 extends over the bottom side of the oven door 18. Alternatively or addi ^¬ tionally, the door inlet opening 34 may extend at least par ^¬ tially over the side walls of said oven door 18. A first air path extends from the door inlet opening 34, through the cooling channel 36, the front inlet opening 38, the first suction area 28, the first fan 20 and the blowing-out area 30 to the front outlet opening 40. Since the vapour outlet 32 is connected to the first suction area 28, moist air is conveyed along the last portion of the first air path.

FIG 2 illustrates a schematic sectional top view of the cooking oven 10 including the cooling system 12 according to the preferred embodiment of the present invention. The cooling system 12 is arranged above the oven cavity 14.

The blowing-out area 30 is subdivided into a first air guidance 48 and a second air guidance 50. The first fan 20 includes a first fan outlet opening 44. In a similar way, the second fan 22 includes a second fan outlet opening 42. The first fan outlet opening 44 corresponds with the first air guidance 50, while the second fan outlet opening 42 corresponds with the second air guidance 48. The first air path extends through the first air guidance 50 of the blowing-out area 30. A second air path extends from inlet slots 46, through a second suction area 28, the second fan 20, and the second air guidance 48 of the blowing-out area 30 to the front outlet opening 40. Said inlet slots 46 may be formed in a side wall of a casing of the cooking oven 10. The second suction area 28 is not explic ^¬ itly shown in FIG 1 and 2. Dry air is conveyed along the second air path.

The cooling system 12 according to the present invention in- eludes two air paths, wherein moist air is conveyed by the first air path, while dry air is conveyed by the second air path. The separation of moist and dry air allows that moisture-sensitive components to be cooled are treated from moist air and cooled by dry air only.

For example, the cooling system 12 of the present invention is provided for a microwave oven or a cooking oven with microwave heating function. Further, the cooling system 12 of the present invention may be provided for a cooking oven with pyrolytic cleaning function.

Although an illustrative embodiment of the present invention has been described herein with reference to the accompanying drawings, it is to be understood that the present invention is not limited to that precise embodiment, and that various other changes and modifications may be affected therein by one skilled in the art without departing from the scope or spirit of the in ^¬ vention. All such changes and modifications are intended to be included within the scope of the invention as defined by the ap- pended claims. List of reference numerals

10 cooking oven

12 cooling system

14 oven cavity

16 heating element

18 oven door

20 first fan wheel, first fan

22 second fan wheel, second fan

24 first fan motor

26 second fan motor

28 first suction area

30 blowing-out area

32 vapour outlet

34 door inlet opening

36 cooling channel

38 front inlet opening

40 front outlet opening

44 first fan outlet opening

42 second fan outlet opening

46 inlet slots

50 first air guidance

48 second air guidance