EP2284401B1 - Ventilator wheel and cooking device - Google Patents

Description

The present invention relates to a fan with a rotatable about a rotation axis first fan blade, the first fan blade is arranged so relative to the axis of rotation and is formed so that upon rotation of the fan independently of a direction of rotation with respect to the axis of rotation by means of the fan a fluid in a radial direction is conveyed away from the axis of rotation, on a first surface of the first fan blade at least a first deposition element having at least one extending away from the first surface first elevation, is arranged, and on a first surface opposite the second surface of the first surface Fan blade at least a second separation element, which has at least one extending away from the second surface second elevation, is arranged, and a cooking appliance comprising at least one fan with a fan impeller according to the invention and a method for depositing iden of particles from a pumped by a fan fluid.

From the prior art, a plurality of fan wheels, in particular in cooking appliances, such as in so-called combi steamers, with which a treatment of a food with hot air or steam, as well as a combined treatment with hot air and steam is possible, are known.

For example, the DE 102 39 246 C1 discloses a fan with integrated grease separation, especially for a cooking appliance. It is proposed that a fan wheel having a base plate on which a plurality of fan blades are mounted has a grease deposit such that on an outer surface of at least a part of the fan blades An increase is appropriate, this increase is welded as an additional element on the outer surface of the Lüfterradschaufeln.

This fan has proven itself in principle, but it has been shown that it is given for a promotion of a fluid radially outward relative to a rotational axis of the fan a sense of rotation of the fan. Due to this direction of rotation of the fan wheel, when the fan wheel is used in a cooking appliance, an uneven flow of a fluid circulated through the fan wheel, such as a cooking chamber atmosphere, may occur. This can also result in a one-sided loading of the drive elements of the fan wheel, which can lead to increased wear.

The DE 103 15 341 A1 discloses a cooking appliance with a fan with a generic fan in the form of a radial impeller and a separator. The radial impeller has a base plate on which a plurality of blades are arranged perpendicular to the base plate radially to a rotational axis. On the blades of the radial impeller corresponding separation elements are pushed, which provide a respective edge on both sides of the blades. By the separation elements, a groove is formed between the blades and the edge at which particles entrained in the fluid to be circulated are separated and deflected. A disadvantage of this generic fan is, however, that also separate elements are provided on the fan blades to ensure a separation of entrained in the fluid fluid particles, which represents an increased manufacturing and thus cost of the fan. In addition, the fan blades must be comparatively large, in particular have a comparatively large thickness, to ensure retention of the separation elements and at the same time to avoid bending or twisting of the fan wheel. However, this results in a comparatively large inertia of the fan wheel, so that precise control of a speed of an atmosphere or fluid circulated by the fan wheel can not be ensured.

Object of the present invention is therefore to further develop the generic fan in such a way that the disadvantages of the prior art are overcome, in particular a fan is provided, which does not have a direction of rotation for conveying a fluid is bound in a radially outward direction, has a structurally simple construction and at the same time has improved separation properties in order to reliably ensure a separation or diversion of fluid particles entrained in the conveyed fluid.

This object is achieved in that the first increase and the second increase are formed integrally with the first fan blade.

It is further proposed that the fan wheel comprises a plurality of fan blades, in particular first fan blades, wherein the fan blades are preferably arranged on a base plate encompassed by the fan, wherein, in particular, the axis of rotation extends substantially parallel to a normal direction of the base plate.

In this case, it is proposed that a first depression complementary to the first elevation is formed on the second surface and / or a second depression complementary to the second elevation is / are formed on the first surface, wherein preferably the first precipitation element comprises the second depression and / or the second separation element comprises the first recess.

It is particularly preferred that the first surface and / or the second surface on the one hand substantially parallel to the normal direction of the base plate and / or the axis of rotation and on the other hand substantially in a radial direction of the axis of rotation and / or extends parallel to the base plate extend.

Furthermore, it is proposed with the invention that the first surface and / or the second surface extends from the base plate to at least one support element or extend, preferably a support member at least one cover ring, which is arranged on the side facing away from the base plate of the first Lüfterradschaufel , and / or the first elevation, the second elevation, the first depression and / or the second depression are formed by means of forming, embossing, compression, folding, laser forming, punching and / or bending.

Furthermore, the invention provides that the first fan blade in the region of the first separation element and / or the second separation element at least partially a substantially S-shaped, Z-shaped, triangular, step-shaped, ramp-shaped and / or sawtooth-shaped cross-sectional shape perpendicular to the first and second Preferably, a first end of the S or Z comprises at least partially the first elevation and / or the second recess and a second end of the S or Z at least partially encompasses the second elevation and / or the first recess or.

A fan impeller according to the invention may be characterized in that the first fan blade in particular the first surface and / or the second surface, an inner edge facing the axis of rotation and an outer edge facing away from the axis of rotation comprises, preferably the first separation element and / or the second separation element, in particular the first elevation, the second elevation, the first depression and / or the second depression extending diagonally from the inner edge in the direction of the outer edge, and / or a distance between the first deposition element and / or the second deposition element on the one hand and the base plate on the other hand Inner edge to the outer edge decreases.

It is furthermore proposed that the first separation element and / or the second separation element, in particular the first elevation, the second elevation, the first depression and / or the second depression, is or are arcuate and / or curved at least in regions, in particular in FIG Direction of the base plate is bent or are.

The invention further provides that the first elevation and / or the first recess has at least one of the base plate and / or the inner edge facing the first flank and at least one of the base plate and / or the inner edge facing away from the second flank, and / or the second elevation and / or the second recess has at least one of the base plate and / or the inner edge facing third edge and at least one of the base plate and / or the inner edge facing away fourth edge, wherein preferably the first edge has a greater or equal slope, in particular relative to the first surface and or the second surface, when the second flank and / or the third flank has a greater or equal slope, in particular relative to the first surface and / or the second surface, as the fourth flank.

It is particularly preferred that the first edge relative to the first surface and / or the third edge relative to the second surface at an angle of more than about 70 °, preferably more than about 80 °, in particular about 90 °, more than about 90 ° or more than about 120 °.

Furthermore, it is proposed that a first geometric extension of the first elevation and / or the second elevation perpendicular to the first surface or the second surface, in particular a height of the first elevation and / or the second elevation, in a direction away from the base plate at least in regions Preferably, the first geometric extent is at least partially about 1mm to 10mm, preferably about 2mm to 7mm, more preferably about 3mm to 6mm, most preferably about 4mm to 5mm, and / or a second geometric dimension of the first deposition element and / or the second separation element, in particular the first elevation, the second elevation, the first depression and / or the second depression, along the first surface and / or the second surface, in particular a width of the first separation element and / or the second separation element, at least be approximately 6mm to 10mm, preferably about 7mm to 9mm, most preferably about 8mm, and / or a third geometric dimension of the first deposition element and the second separation element, in particular a total width of the first separation element and the second separation element, about 12mm to 25mm, more preferably about 14mm to 22mm, more preferably about 16mm to 20mm, and most preferably about 18mm.

It is also proposed with the invention that a distance between on the one hand the first separation element and / or the second separation element, in particular the first elevation and / or the second elevation, and on the other hand, the base plate, in particular in the region of the outer edge, about 5mm to 25mm, preferably about 10mm to 20mm.

Finally, it is proposed for the fan that the first fan blade includes a plurality of first Abscheidelementen and / or second Abscheidelementen.

Furthermore, the invention provides a cooking appliance with a fan according to the invention, wherein preferably by means of the blower, an atmosphere within a cooking chamber of the cooking appliance can be conveyed.

Furthermore, the invention provides a method for separating particles from the fluid dispersed in a fluid conveyed by a fan wheel, in particular a fan impeller according to the invention, the fluid being independent of the direction of rotation of the fan wheel about a rotation axis in a radial direction from the rotation axis is conveyed away, wherein the particles during rotation of the fan in a first rotational direction about the axis of rotation at least partially by at least a first separation element, which is at least partially formed by a formed on at least a first surface of a first Lüfterradschaufel integral with the first Lüfterradschaufel first increase, are deposited and the particles upon rotation of the fan in a first rotational direction opposite, second direction of rotation at least partially by at least a second deposition element, at least partially by a on at least a second Oberfläc He, the first surface of the first fan blade is formed integrally with the first fan blade formed second elevation, are deposited.

Finally, it is preferred for the method that a first depression is formed by the first elevation on the second surface and / or a second depression is formed by the second elevation on the first surface, wherein preferably the first precipitation element also extends through the second depression and Furthermore, the second deposition element may also be formed by the first depression and / or the first elevation, the second elevation, the first depression and / or the second depression by forming, embossing, compression, folding, laser forming, punching and / or bending is trained or become.

The invention is thus based on the surprising finding that a fan wheel can be provided by the one-piece design or integral formation of a separation element in a fan blade, in particular by forming the Lüfterradschaufel, which constructively simple design and thus inexpensive and easy to manufacture is at the same time a more efficient separation of liquid particles entrained in a fluid allows no rotation specification for a promotion of a fluid radially outwards relative to a rotation axis and has a lower carrier moment, since the fan blades can have a smaller geometric dimension, in particular thinner, and thus a more sensitive control of a delivery of a fluid is made possible. By the separation elements entrained in a funded fluid or a cooking medium, in particular bound particles and liquids directed at turning the impeller targeted to a planned ejection point, in particular led around the fan arranged heating elements.

Here, the particles are dispersed in the pumped fluid, so the fluid may in particular represent an aerosol, in which solid and / or liquid particles are present in a gaseous fluid.

Two effects play a role here. First, the increase in itself act as guide elements, where occurring on the fan wheel liquid particles are guided along and thus liquid-separating effect. Due to the integral formation of the elevation, a depression, which has a corresponding edge formation, also forms on the opposite side of the fan blade and through which the liquid impinging on the fan blade is additionally channeled and guided to a discharge point. Due to the two-sided design of the increase forms an increase and depression combination on both sides, which is effective in both directions of rotation of the fan. In this way, moreover, a higher liquid separation efficiency is achieved because particles passing over the depression are "intercepted" at the elevation, and vice versa, particles that pass beyond the elevation are trapped in the depression.

The core idea of the invention is thus that a deformation of the fan blades of the fan wheel causes the known from the prior art increase is caused by deformation in one direction of rotation and in the opposite direction an additional recess is used. The increase as well as the depression caused by transformations and are equal according to the invention in their effect, meet both in particular the effect a liquid separation element. At the same time, however, an improvement in the rigidity of the impeller is achieved by an increased degree of deformation, so that a material thickness reduction can be achieved and thus the weight of the fan and thus the moment of inertia can be reduced.

Also, a more cost-effective production is possible because no welding must be made and no separate parts must be attached to the fan blades. In addition, this results in an increased quality of the fan wheel, since there is no gap formation in the fan blade and thus a better cleaning of the fan wheel is made possible, which is particularly important from a hygiene point of view when using the fan in a cooking appliance of high importance.

Figur 1

eine schematische Querschnittsansicht eines erfindungsgemäßen Lüfterrades;

Figur 2a

eine schematische Aufsicht auf eine Lüfterradschaufel eines Lüfterrades gemäß einer ersten Ausführungsform;

Figur 2b

eine schematische Querschnittsansicht der Lüfterradschaufel der Figur 2a aus Richtung A;

Figur 2c

eine schematische Querschnittsansicht einer ersten alternativen Ausgestaltung der Lüfterradschaufel der Figur 2a aus Richtung A;

Figur 2d

eine schematische Querschnittansicht einer zweiten alternativen Ausgestaltung der Lüfterradschaufel der Figur 2a aus Richtung A;

Figur 3a

eine schematische Aufsicht auf eine Lüfterradschaufel eines Lüfterrads gemäß einer zweiten Ausführungsform der Erfindung;

Figur 3b

eine schematische Seitenansicht der Lüfterradschaufel der Figur 3a aus Rich- tung B;

Figur 3c

eine schematische Querschnittsansicht der Lüfterradschaufel der Figur 3a aus Richtung C;

Figur 4a

eine schematische Aufsicht auf eine Lüfterradschaufel eines Lüfterrads gemäß einer dritten Ausführungsform der Erfindung;

Figur 4b

eine schematische Seitenansicht auf die Lüfterradschaufel der Figur 4a aus Richtung D; und

Figur 4c

eine schematische Querschnittsansicht der Lüfterradschaufel der Figur 4a aus Richtung E.

Further advantages and features of the invention will become apparent from the following description, are explained in the preferred embodiments of the invention with reference to schematic drawings. Showing:

FIG. 1

a schematic cross-sectional view of a fan according to the invention;

FIG. 2a

a schematic plan view of a Lüfterradschaufel a fan wheel according to a first embodiment;

FIG. 2b

a schematic cross-sectional view of the Lüfterradschaufel the FIG. 2a from direction A;

Figure 2c

a schematic cross-sectional view of a first alternative embodiment of the Lüfterradschaufel the FIG. 2a from direction A;

Figure 2d

a schematic cross-sectional view of a second alternative embodiment of the Lüfterradschaufel the FIG. 2a from direction A;

FIG. 3a

a schematic plan view of a fan blade of a fan according to a second embodiment of the invention;

FIG. 3b

a schematic side view of the Lüfterradschaufel the FIG. 3a from direction B;

Figure 3c

a schematic cross-sectional view of the Lüfterradschaufel the FIG. 3a from direction C;

FIG. 4a

a schematic plan view of a fan blade of a fan according to a third embodiment of the invention;

FIG. 4b

a schematic side view of the fan blade of the FIG. 4a from direction D; and

Figure 4c

a schematic cross-sectional view of the Lüfterradschaufel the FIG. 4a from direction E.

In FIG. 1 is a schematic cross-sectional view of a fan wheel 1 according to the invention shown. The fan 1 has a base plate 3, which is rotatably supported about a shaft 5 about a rotation axis d on. The fan 1 is driven via the shaft 5 by means of a drive device, not shown, such as a motor. On the base plate 3, a plurality of Lüfterradschaufeln is arranged, of which fan blades 7, 9 are shown. On the side facing away from the base plate 3 of the Lüfterradschaufeln 7, 9, an annular support member 11 is arranged.

The fan 1 is in particular of a fan, not shown, which is arranged in a fan room, not shown, or a cooking chamber, not shown, a cooking appliance, in particular a combi steamer, comprises. By means of the fan wheel 1, a fluid in the form of a cooking chamber atmosphere is circulated within the cooking chamber for equalization of the cooking chamber climate within the cooking chamber. For this purpose, the fan wheel 1 is rotated about the axis of rotation d, wherein the fan blades 7, 9 are arranged in particular radially outwardly from the axis of rotation d, so that by rotation of the fan 1 about the axis of rotation d, regardless of a direction of rotation, one by arrows 13 indicated flow arises. Radially around the fan 1 heating elements 15 are arranged, by means of which the funded by the fan 1 fluid is heated.

In order to avoid that liquid particles entrained in the fluid, such as fat droplets, strike the heating elements 15 and are burned there, which leads to an impairment of the cooking chamber atmosphere, the fan blades 7, 9 comprise separating devices 17, 19. These separating devices 17, 19 cause liquid droplets entrained in the fluid to be guided along the separating devices 17, 19 towards the base plate 3, in particular due to the centrifugal forces acting on the particles, and then over a gap 21, 23 between the separating device 17, 19 and the base plate 3 is formed to leave the fan 1, in particular the fan blades 7, 9, in an area that is outside of the heating elements 15.

In FIG. 2a is a schematic plan view of the Lüfterradschaufel 7 shown. The Lüfterradschaufel 7 has an inner edge 25 and an outer edge 27, wherein the inner edge 25 of the axis of rotation d faces, while the outer edge 27 of the axis of rotation d faces away. As FIG. 2a Furthermore, it can be seen, the separation device 17 extends diagonally from the inner edge 25 to the outer edge 27, in particular, the distance of the separating device 17 to the base plate 3 from the inner edge 25 to the outer edge 27 decreases. In addition, the separation device 17 is arcuate or curved.

In FIG. 2b is a schematic cross-sectional view of the Lüfterradschaufel 7 shown from direction A. As FIG. 2b can be seen, the Lüfterradschaufel 7 has a first surface 29 and a second surface 31. The separation device 17 comprises a first separation element 33, which comprises a first elevation 35. In addition, the separation device 17 comprises a second separation element 37, which comprises a second elevation 39. In this case, the elevations 35, 39 are integrally formed in the Lüfterradschaufel 7, in particular, the elevations 35, 39 were formed by forming, preferably embossing, in the Lüfterradschaufel 7.

The course of the separation device 17 and the integral formation of the elevation 35, 39 or separation elements 33, 37 in the fan blade 7 lead to an additional Reinforcement of the fan blade 7 is achieved, so that in comparison to known from the prior art Lüfterradschaufeln a thinner base material can be selected and so a material savings can be made. In addition, due to this stiffening of the fan blade 7 in principle, the support element 11 can be dispensed with in terms of the stability of the fan wheel 1.

By this formation of the elevations 35, 39 7 complementary recesses 41, 43 are formed on the respective opposite surface 29, 31 of the Lüfterradschaufel. In this case, a first recess 41 forms a further element of the second separation element 37, while the second recess 43 forms a further element of the first separation element 33.

The first elevation 35 has a first flank 45 and a second flank 47, while the second flare 39 has a third flank 49 and a fourth flank 51. In this case, the first edge 45 and the third edge 49 of the base plate 3 and inner edge 25 facing, while the second edge 47 and the fourth edge 51 facing away from the base plate or inner edge 25 and the outer edge 27 are facing.

In the in FIG. 2b In particular, the third flank 49 extends almost perpendicular to the surface 31. This causes, with a rotation of the fan wheel 1 and thus the fan blade 7 due to the centrifugal force liquid particles move in the direction of the edge 49, there are collected and the direction of the base plate 3 are discharged. Preferably, the flank 49, as already mentioned, is perpendicular to the second surface 31, thus preferably enclosing with this an angle of approximately 90 °.

The elevation 39 is substantially sawtooth-shaped, i. the fourth flank 51 has a smaller pitch than the third flank 49. Thus, the second separation element 37 causes liquid to be collected at the flank 49.

If it happens that liquid can pass over the flank 49, then it is then collected in the recess 41 included according to the invention by the second separating element 41. Since the flank 47 of the first elevation 33 and thus the complementary inner wall of the recess 41 is also perpendicular to the first surface 29, the liquid is finally collected in the recess 41 and discharged in the recess 41 in the direction of the base plate 3.

At the in FIG. 2b The separating elements 33, 37 essentially form an S or Z shape.

In the Figures 2c and 2d are alternative embodiments of in FIG. 2a shown Lüfterradschaufel 7 in the form of fan blades 107 and 207 shown. In particular, the fan blade 107 and the fan blade 207 have compared to that in FIG FIG. 2b illustrated cross-section different cross-sectional shapes having separating device 117 and 217 on. Those elements of the Lüfterradschaufel 107, which correspond to those of the Lüfterradschaufel 7, carry the same reference numerals, however, increased by a factor of 100, while those elements of the Lüfterradschaufel 207, which correspond to those of the Lüfterradschaufel 7, the same reference numerals, but by a factor of 200 elevated. In order to increase a separation effect of the respective separation device, the separation device 117 has a substantially rectangular cross-sectional shape compared to the separation device 17; in particular, the elevations 135 and 139 are substantially rectangular in shape.

In contrast, the separation device 217 has tapered elevations 235 and 239 to achieve a higher separation efficiency.

In both alternative embodiments, the base plate facing edge 145, 245 and third edge 148, 249, the respective Abscheideelements 133, 137, 233, 237 and the respective increase 135, 139, 235, 239 has a greater or an equal slope as the second edge 147, 247 and fourth edge 151, 251, in order to achieve the greatest possible degree of separation through the elevations 135, 139, 235, 239. By the in Figure 2c illustrated embodiment is further achieved that also the flanks of the recesses, which face the base plate or inner edge, have a comparatively large pitch to achieve the greatest possible degree of separation in the recess.

In the FIGS. 3a to 3c a second embodiment of a fan blade according to the invention 7 'is shown. Elements of the Lüfterradschaufel 7 ', those of the Lüfterradschaufel 1 of Figures 1 to 2b correspond, bear the same reference numerals, but simply deleted.

As if from a comparison of FIGS. 2a and 3b recognizable, is the separation device 17 ', in particular the separation elements 33', 37 'and their elevations 35', 39 ', also arcuately formed from the inner edge 25' to the outer edge 27 'of the Lüfterradschaufel 7', however, the curvature to the Base plate 3 'curved towards.

As well as beyond FIG. 3b can be seen, takes a height h ₁ 'of the increase 35' from the direction of the support member 11 'in the direction of the base plate 3', for example from 2mm to 4mm, as well as a height h ₂ 'of the increase 39'. Also, the height h ₁ 'and / or h ₂ ' 8mm to 10mm amount. This ensures that even larger amounts of liquid that collect to the base plate 3 ', can be reliably guided along the elevations 35', 39 ', without excessively increase a flow resistance.

Moreover, from a comparison of Figures 3c and 2 B results, the elevations 35 ', 39' in comparison to the elevations 35, 39 a different cross-sectional shape. Thus, both the first and the second flank 45 ', 47' and the third flank 49 'and fourth flank 51' are each formed perpendicularly relative to the surfaces 29 ', 31' of the fan blade 7 '. By this choice of the flank shape, in particular a substantially rectangular cross-sectional shape, the elevations 35 ', 39', a best possible collection of liquid on the flanks 45 ', 49' and in the recesses 41 ', 43' is achieved.

In the FIGS. 4a to 4c Finally, there is shown a third embodiment of a fan blade 7 "according to the invention The elements of the fan blade 7" which correspond to those of the fan blade 7 or 7 'bear the same reference numerals, but painted twice.

As can be seen from a comparison of FIGS. 4a and 2a the separation device 17 "is rectilinearly formed FIGS. 4b and 3b . the elevations 35 ", 39" along the extent from the inner edge 25 "to the outer edge 27" have a constant height h ₁ "or h ₂ ", for example 4.5 mm. As it turned out Figure 4c Thus, the first flank 45 "and the third flank 49" have a higher pitch than the second flank 47 "and the fourth flank 51", respectively the flanks 49 "and 45" is collected and is guided along these flanks to the gap 21 ".

It should be noted, however, that for this purpose the liquid first flows into the depression 43 "in the case of the first precipitation element and is collected on the flank 45" only in the event that it emerges from the recess 43 "due to the centrifugal forces at the second separation element 37 "collected the liquid at the third edge 49" and only in the case where it goes beyond the increase 39 "out into the recess 41" where they then along the recess 41 "in the direction of the gap 21st A width b ₁ "of the first deposition element 33" is 7.5 mm, for example, similar to a width b ₂ "of the second separation element 37". For example, a total width b ₃ "of the separation device 17" is 18.4 mm.

reference numeral

1

fan

3, 3 ', 3 "

baseplate

5

wave

7, 7 ', 7 ", 107, 207

fan impeller blade

9

fan impeller blade

11, 11 ', 11 "

support element

13

arrow

15

heating element

17, 17 ', 17 ", 117, 217

separating

19

separating

21, 21 ', 21 "

gap

23

gap

25,25 ', 25 "

inner edge

27, 27 ', 27 "

outer edge

29, 29 ', 29 ", 129, 229

surface

31, 31 ', 31 ", 131, 231

surface

33, 33 ', 33 ", 133, 233

separating element

35, 35 ', 35 ", 135, 235

increase

37, 37 ', 37 ", 137, 237

separating element

39, 39 ', 39 ", 139, 239

increase

41, 41 ', 41 ", 141, 241

deepening

43, 43 ', 43 ", 143, 243

deepening

45, 45 ', 45 ", 145, 245

flank

47, 47 ', 47 ", 147, 247

flank

49, 49 ', 49 ", 149, 249

flank

51, 51 ', 51 ", 151, 251

flank

h ₁ ', h ₂ ', h ₁ ", h ₂ "

height

b ₁ ", b ₂ ", b ₃ "

width

d

axis of rotation

A, B, C, D, E

direction

Claims (15)

1. A ventilator wheel (1) with at least one first ventilator wheel blade (7, 7', 7", 9), said first ventilator wheel blade being rotatable about an axis of rotation (d), wherein
   the first ventilator wheel blade (7, 7', 7", 9) is arranged relative to the axis of rotation (d) in such a manner and shaped in such a manner that a fluid is conveyed by means of the ventilator wheel (1) in a radial direction away from the axis of rotation (d) independently of a sense of rotation with respect to the axis of rotation (d) when the ventilator wheel (1) rotates,
   at least one first separating element (33, 33', 33") is arranged on a first surface (29, 29', 29") of the first ventilator wheel blade (7, 7', 7", 9), said first separating element having at least one first raised part (35, 35', 35") that extends away from the first surface (29, 29', 29"), and
   at least one second separating element (37, 37', 37") is arranged on a second surface (31, 31', 31") of the first ventilator wheel blade (7, 7', 7", 9), said second separating element having at least one second raised part (39, 39', 39") that extends away from the second surface (31, 31', 31"), said second surface being arranged opposite the first surface (29, 29', 29"),
   characterized in that
   the first raised part (35, 35', 35") and the second raised part (39, 39', 39") are formed integrally with the first ventilator wheel blade (7, 7', 7", 9).
2. The ventilator wheel according to claim 1, characterized in that
   the ventilator wheel (1) comprises a plurality of ventilator wheel blades (7, 7', 7", 9), particularly of first ventilator wheel blades (7, 7', 7", 9), wherein the ventilator wheel blades (7, 7', 7", 9) are preferably arranged on a base plate (3, 3', 3") comprised by the ventilator wheel, wherein further particularly the axis of rotation (d) extends essentially parallel to a normal direction of the base plate (3, 3', 3 ").
3. The ventilator wheel according to claim 1 or 2, characterized in that
   a first recess (41, 41', 41") that is complementary to the first raised part (35, 35', 35") is formed on the second surface (31, 31', 31 ") and/or a second recess (43, 43', 43 ") that is complementary to the second raised part (39, 39', 39") is formed on the first surface (29, 29', 29"), wherein preferably
   the first separating element (33, 33', 33") comprises the second recess (43, 43', 43") and/or the second separating element (37, 37', 37") comprises the first recess (41, 41', 41 ").
4. The ventilator wheel according to any one of the preceding claims, characterized in that
   the first surface (29, 29', 29") and/or the second surface (31, 31', 31") extend/extends from the base plate (3, 3', 3") to at least one supporting element (11, 11', 11"), wherein preferably the supporting element (11, 11', 11") comprises at least one covering ring arranged on that side of the first ventilator wheel blade (7, 7', 7", 9) which faces away from the base plate (3, 3', 3 "), and/or the first raised part (35, 35', 35 "), the second raised part (39, 39', 39"), the first recess (41, 41', 41") and/or the second recess (43, 43', 43") are/is formed by means of forming, embossing, upsetting, crimping, laser forming, pressing and/or bending.
5. The ventilator wheel according to any one of the preceding claims, characterized in that
   in the region of the first separating element (33, 33', 33") and/or of the second separating element (37, 37', 37"), the first ventilator wheel blade (7, 7', 7", 9) has, at least in sections, an essentially S-shaped, Z-shaped, triangle-shaped, step-shaped, ramp-shaped and/or sawtooth-shaped cross-section perpendicular to the first and second surfaces (29, 29', 29", 31, 31', 31"), wherein preferably
   a first end of the S or of the Z comprises, at least in sections, the first raised part (35, 35', 35") and/or the second recess (43, 43', 43") and a second end of the S or of the Z comprises, at least in sections, the second raised part (39, 39', 39") and/or the first recess (41, 41', 41").
6. The ventilator wheel according to any one of the preceding claims, characterized in that
   the first ventilator wheel blade (7, 7', 7", 9), particularly the first surface (29, 29', 29") and/or the second surface (31, 31', 31 "), comprises an inner edge (25, 25', 25 ") facing the axis of rotation (d) and an outer edge (27, 27', 27") facing away from the axis of rotation (d), wherein preferably the first separating element (33, 33', 33") and/or the second separating element (37, 37', 37"), particularly the first raised part (35, 35', 35"), the second raised part (39, 39', 39"), the first recess (41, 41', 41 ") and/or the second recess (43, 43', 43 "), extend/extends diagonally from the inner edge (25, 25', 25") toward the outer edge (27, 27', 27"), and/or a distance between the first separating element (33, 33', 33") and/or the second separating element (37, 37', 37") on the one hand and the base plate (3, 3', 3") on the other hand decreases from the inner edge (25, 25', 25") to the outer edge (27, 27', 27").
7. The ventilator wheel according to any one of the preceding claims, characterized in that
   the first separating element (33, 33', 33") and/or the second separating element (37, 37', 37"), particularly the first raised part (35, 35', 35 "), the second raised part (39, 39', 39"), the first recess (41, 41', 41") and/or the second recess (43, 43', 43 "), are/is, at least in sections, bent and/or curved, in particular curved toward the base plate (3, 3', 3 ").
8. The ventilator wheel according to any one of the preceding claims, characterized in that
   the first raised part (35, 35', 35 ") and/or the first recess (41, 41', 41 ") have/has at least one first flank (45, 45', 45") facing the base plate (3, 3', 3") and/or the inner edge (25, 25', 25") and at least one second flank (47, 47', 47 ") facing away from the base plate (3, 3', 3 ") and/or the inner edge (25, 25', 25 "), and/or the second raised part (39, 39', 39") and/or the second recess (43, 43', 43 ") have/has at least one third flank (49, 49', 49") facing the base plate (3, 3', 3 ") and/or the inner edge (25, 25', 25 ") and at least one fourth flank (51, 51', 51 ") facing away from the base plate (3, 3', 3 ") and/or the inner edge (25, 25', 25"), wherein preferably
   the first flank (45, 45', 45 ") has a gradient greater than or equal to the gradient of the second flank (47, 47', 47"), in particular relative to the first surface (29, 29', 29") and/or the second surface (31, 31', 31 "), and/or the third flank (49, 49', 49") has a gradient greater than or equal to the gradient of the fourth flank (51, 51', 51"), in particular relative to the first surface (29, 29', 29") and/or the second surface (31, 31', 31").
9. The ventilator wheel according to claim 8, characterized in that
   the angle between the first flank (45, 45', 45") and the first surface (29, 29', 29") and/or the angle between the third flank (49, 49', 49") and the second surface (31, 31', 31") are/is greater than approximately 70°, preferably greater than approximately 80°, in particular approximately 90°, greater than approximately 90° or greater than approximately 120°.
10. The ventilator wheel according to any one of the preceding claims, characterized in that
    a first geometrical dimension of the first raised part (35, 35', 35") and/or of the second raised part (39, 39', 39") perpendicular to the first surface (29, 29', 29")/the second surface (31, 31', 31"), in particular a height (h₁', h₂') of the first raised part (35, 35', 35") and/or of the second raised part (39, 39', 39"), decreases, at least in sections, in a direction away from the base plate (3, 3', 3 "), said decrease preferably being a continuous decrease,
    wherein preferably the first geometrical dimension (h₁', h₂', h₁", h₂") is, at least in sections, approximately 1 mm to 10 mm, preferably approximately 2 mm to 7 mm, more preferably approximately 3 mm to 6 mm, and most preferably approximately 4 mm to 5 mm, and/or a second geometrical dimension of the first separating element (33, 33', 33") and/or of the second separating element (37, 37', 37"), in particular of the first raised part (35, 35', 35"), of the second raised part (39, 39', 39"), of the first recess (41, 41', 41") and/or of the second recess (43, 43', 43"), along the first surface (29, 29', 29") and/or the second surface (31, 31', 31"), in particular a width (b₁", b₂") of the first separating element (33, 33', 33") and/or of the second separating element (37, 37', 37"), is, at least in sections, approximately 6 mm to 10 mm, preferably approximately 7 mm to 9 mm, and most preferably approximately 8 mm, and/or
    a third geometrical dimension of the first separating element (33, 33', 33 ") and of the second separating element (37, 37', 37"), in particular an overall width (b₃") of the first separating element (33, 33', 33") and of the second separating element (37, 37', 37"), is approximately 12 mm to 25 mm, more preferably approximately 14 mm to 22 mm, still more preferably approximately 16 mm to 20 mm, and most preferably approximately 18 mm.
11. The ventilator wheel according to any one of the preceding claims, characterized in that
    a distance (21, 21', 21 ") between, on the one hand, the first separating element (33, 33', 33 ") and/or the second separating element (37, 37', 37"), particularly the first raised part (35, 35', 35") and/or the second raised part (39, 39', 39"), and, on the other hand, the base plate (3, 3', 3"), particularly in the region of the outer edge (27, 27', 27"), is approximately 5 mm to 25 mm and preferably approximately 10 mm to 20 mm.
12. The ventilator wheel according to any one of the preceding claims, characterized in that
    the first ventilator wheel blade (7, 7', 7", 9) comprises a plurality of first separating elements (33, 33', 33") and/or second separating elements (37, 37', 37").
13. A cooking device, in particular a hot-air/steam cooking device, comprising at least one fan with a ventilator wheel (1) according to any one of the preceding claims, wherein preferably an atmosphere can be conveyed within a cooking chamber of the cooking device by means of the fan.
14. A method for separating particles from a fluid that is conveyed by a ventilator wheel, in particular by a ventilator wheel according to any one of claims 1 to 12, said particles being disperse in said conveyed fluid, wherein said fluid is conveyed, independently of the sense of rotation of the ventilator wheel about an axis of rotation (d), in a radial direction away from the axis of rotation (d), characterized in that
    the particles are at least partially separated by at least one first separating element when the ventilator wheel rotates in a first direction of rotation about the axis of rotation (d), said first separating element being at least partially formed by a first raised part that is formed on at least one first surface of a first ventilator wheel blade and formed integrally with the first ventilator wheel blade, and the particles are at least partially separated by at least one second separating element when the ventilator wheel rotates in a second direction of rotation opposite to the first direction of rotation, said second separating element being at least partially formed by a second raised part that is formed on at least one second surface of the first ventilator wheel blade and formed integrally with the first ventilator wheel blade, said second surface being arranged opposite the first surface.
15. The method according to claim 14, characterized in that
    a first recess is formed on the second surface by the first raised part and/or a second recess is formed on the first surface by the second raised part, wherein preferably the first separating element is further also formed by the second recess and/or the second separating element is further also formed by the first recess, and/or the first raised part, the second raised part, the first recess and/or the second recess are/is formed by means of forming, embossing, upsetting, crimping, laser forming, pressing and/or bending.

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