VENTILATOR WHEEL AND VENTILATOR

Abstract

The invention relates to a ventilator wheel which is produced in the form of a radial or a diagonal ventilator wheel, and comprises a bottom disc and a plurality of ventilator blades arranged, on said bottom disc, so as to be distributed about an axial rotational axis, said bottom disc comprising a circumferential radial outer edge section that, when viewed in cross-section, extends in a curved shape in at least some sections and thus forms an elliptical transition of said bottom disc from a radial extension into an axial extension.

Claims

1. A ventilator wheel designed as a radial ventilator wheel or diagonal ventilator wheel, with a bottom disk and a plurality of ventilator blades arranged and distributed about an axial axis of rotation on the bottom disk, whose axial height dimension runs between an intake side and the bottom disk, wherein the bottom disk has a circumferential radial outer rim section which runs at least for a portion as a curved shape, looking in the cross section, and thereby forms an elliptical transition of the bottom disk from a radial extension to an axial extension, the ventilator blades having a radial outer edge, each forming a transition point on a side with the bottom disk, and an imaginary ring joining the transition points in the circumferential direction forms a boundary line to which the elliptical transition of the bottom disk is adjacent immediately or with a spacing in the radial direction.

2. The ventilator wheel according to claim 1, wherein the elliptical transition in the circumferential radial outer rim section of the bottom disk has a half-axis length ratio (a)/(b) in a range of 1 to 10, especially 2 to 5, where (a) corresponds to a half-axis length in the radial direction and (b) to a half-axis length in the axial direction of the ventilator wheel.

3. The ventilator wheel according to claim 1, wherein an axial prolongation is formed in the axial direction on the elliptical transition as a single piece.

4. The ventilator wheel according to claim 1, wherein the bottom disk has an axial step in the center region lying outside the axis of rotation.

5. The ventilator wheel according to claim 4, wherein the axial step is substantially Z-shaped, looking in the cross section, with a web extending partly in the radial and axial direction.

6. The ventilator wheel according to claim 5, wherein the web runs at an angle of 20 to 60 degrees with respect to the radial direction of the ventilator wheel.

7. The ventilator wheel according to claim 4, wherein a hub is formed on the bottom disk, adjoining the step in the radial direction.

8. The ventilator wheel according to claim 4, wherein the step has an axial height corresponding to 20% of the half-axis length (b) of the elliptical transition in the axial direction.

9. The ventilator wheel according to claim 1, wherein it has a cover disk opposite the bottom disk and covering at least partly the ventilator blades on the intake side, forming an inlet opening extending about the axis of rotation.

10. The ventilator wheel according to claim 9, wherein the ventilator blades each have a marginal segment pointing toward the intake side, extending separately from the cover disk.

11. The ventilator wheel according to claim 1, wherein an imaginary envelope curve runs around the ventilator blades in the circumferential direction at an oblique angle of 60 to 80 degrees with respect to a radial extension of the bottom disk.

12. The ventilator wheel according to claim 1, wherein a ratio (d)/(h) of an the outer diameter (d) of the bottom disk to a total axial height (h) of the bottom disk lies in a range of 20 to 25.

13. The ventilator wheel according to claim 1, wherein a ratio (d)/(a) of the outer diameter (d) of the bottom disk to the half-axis length (a) of the elliptical transition is in a range of 10 to 15, preferably 11 to 12.

14. A ventilator with a ventilator wheel according to claim 1, wherein the ventilator is arranged in a volume flow conducting component with a square flow cross section with an edge length, and a ratio of the edge length to an outer diameter of the ventilator wheel is in a range of 1.1 to 3.0, preferably 1.5 to 2.5.

Description

[0020] Other advantageous modifications of the invention are characterized in the subclaims or shall be presented more closely below together with the description of the preferred embodiment of the invention with the aid of the figures. There are shown:

[0021] FIG. 1, a lateral sectional view of a ventilator wheel;

[0022] FIG. 2, a schematic representation of a ventilator in a volume flow conducting element;

[0023] FIG. 3, a representation of the flow in a volume flow conducting element;

[0024] FIG. 4, a representation of the flow in a room test stand.

[0025] FIG. 1 shows a lateral sectional view of a radial ventilator wheel 1 with a bottom disk 2 and a cover disk 13 provided on the intake side 4 and forming an air inlet opening 14, between which there are provided a plurality of ventilator blades 3 arranged distributed about the axial axis of rotation. The ventilator blades 3 extend on the bottom disk 2 from a center region 10 radially and in part diagonally outward and form a radial air outlet region at their outer radial edge 8. The ventilator blades 3 are each curved in shape, so that they run in an arc in a top view and have an upper marginal segment 15 free of the cover disk 13 in a region toward the axial center. The radial outer edges 8 of the ventilator blades 3 end on the bottom disk 2 each time at a transition point 9. The axially slanting extension of the outer edges 8 of the ventilator blades 3 from the bottom disk 2 to the cover disk 13 occurs in the embodiment depicted with an angle of around 70 degrees, while the ventilator blades 3 form with the cover disk 13 a substantially flush radially outer edge closure. If the transition points 9 are joined into a ring, an imaginary boundary line is formed, to which the elliptical transition 6 of the bottom disk 2 is immediately adjacent in the radial direction or, as in the depicted embodiment, with a slight spacing. The starting point of the elliptical transition 6 in the radial direction is defined as the beginning of the curvature of the bottom disk 2 in the axial direction.

[0026] The bottom disk 2 has a circumferential radial outer margin section 5, which in the lateral cross section shown runs in an arc and forms the elliptical transition 6 of the bottom disk 2 from its radial extension outwardly to an axial extension on a side opposite the ventilator blades 3. The elliptical transition 6 is determined by the half-axis lengths a and b, whose ratio a/b in the embodiment shown has a value of around 3.0. Once the extension of the bottom disk 2 is parallel to the axis of rotation, the elliptical transition 6 is considered to be completed. Thereafter, the axial prolongation 7 is formed as a single piece in the axial direction.

[0027] Around the axis of rotation of the bottom disk 2 there is provided a central opening 19 at a center 10 about the axis of rotation, on whose radially outer rim is formed the hub 12. In a central region 10 extending about its center 10 the bottom disk 2 has an axial, substantially Z-shaped step 11, while the slanting web 12 of the Z extending partly in the radial and partly in the axial direction runs at an angle of around 40 degrees with respect to the radial direction of the ventilator wheel 1, i.e., in a plane parallel to the bottom disk 2. The step 11 in the embodiment shown has an axial height Z which is around 15% larger than the half-axis length b of the elliptical transition 6 in the axial direction. The ratio d/h between the outer diameter d of the bottom disk 2 and its total axial height h is set at a value of around 23 in the embodiment shown.

[0028] FIG. 2 shows a schematic representation of a ventilator 20 with the ventilator wheel 1 in a state installed centrally to the axis of a volume flow conducting element 21. The volume flow conducting element 21 in the embodiment shown has a square cross section with an edge length G, which is larger by a factor of 1.3 than the outer diameter D of the ventilator wheel 1.

[0029] The layout represented in FIG. 2 corresponds to a realistic installation situation of the ventilator 20 as well as the ventilator wheel 1. This generates a flow 16 with a variation as shown in FIG. 3. After being taken in through the intake opening 14, the air is at first blown out radially from the ventilator wheel 1. After this, the major portion of the flow 16 lies against the inner wall of the volume flow conducting element 21 in the axial direction and has undergone a directional change from radial to axial. The flow 26 achieved in the room test stand lies against a wall 31 continuing in the radial direction of the ventilator wheel 1, as shown for example in FIG. 4. There is no deflection of the flow here.

[0030] The invention is not limited in its embodiment to the preferred sample embodiments indicated above. Instead, a number of variants are conceivable, making use of the presented solution even with fundamentally different embodiments. For example, the axial prolongation 7 may also be slanting or curved in configuration. Furthermore, a change can be provided in the material thickness of the bottom disk, for example, with a tapering in the direction of the axial prolongation.