Fan wheel and radiator fan module with the fan wheel

Patent metadata

Field	Value
Publication number	US-11022139-B2
Application number	US-201816122148-A
Country	US
Kind code	B2
Filing date	Sep 5, 2018
Priority date	Sep 5, 2017
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

A fan wheel has a hub cup and a plurality of blades extending radially outward from an outer wall of the hub cup, which is in particular at least substantially cylindrical. Each blade has a leading edge and a trailing edge, wherein for at least one blade, the progression of a relative position of the blade's leading edge and/or the progression of a relative position of the blade's trailing edge has an aperiodically wave-like shape. There is also described a radiator fan module with a fan wheel of the type described above, and a motor vehicle with such a radiator fan module.

First claim

The invention claimed is:

1. A fan wheel, comprising:
a hub cup; and
a plurality of blades arranged on said hub cup and extending radially outward from an outer wall of said hub cup;
each of said blades having a leading edge and a trailing edge;
wherein the following applies for at least one of said blades, or for some of said blades, or for all of said blades:
a reference line is defined by:
a first point on an axis of rotation of the fan wheel;
a radial extent through the first point and perpendicular to the axis of rotation; and
a second point that bisects an arcuate edge into two equal sections at a transition from said hub cup to said blade,

a reference plane is defined by a line displaced parallel to the axis of rotation and a line displaced parallel to said reference line, a displacement, as viewed in a direction of rotation of the fan wheel, being located entirely in front of said blade,
wherein an orthogonal projection of said leading edge of said at least one blade and an orthogonal projection of said trailing edge of said at least one blade are mapped in the reference plane;
wherein a z-axis is defined in the reference plane by an orthogonal projection of the axis of rotation in the reference plane, which is displaced parallel outward in a radial direction in the reference plane from the orthogonal projection of the axis of rotation around an outer radius of said hub cup;
wherein a y-axis is defined in the reference plane by an orthogonal projection of the radial extent in the reference plane;
wherein a relative unit radius t(r) is plotted on the y-axis, and is defined as follows:

t
⁡

(
r
)

=

r
-

R
i

R
a

-

R
i

wherein
R i is an outer radius of said hub cup;
R a is an outer radius of said at least one blade; and
r is a distance between the axis of rotation and a sectional plane under consideration, which is at distance r perpendicular from the axis of rotation on the associated reference line, wherein r∈[R i ;R a ]

wherein a relative position of said leading edge POS rel_VK and/or a relative position of said trailing edge POS rel_HK is plotted on the z-axis;
wherein a progression of the relative position of said leading edge POS rel_VK (t) and/or a progression of the relative position of said trailing edge POS rel_HK (t) has an aperiodically wave-like shape;
wherein the progression of the relative position of said leading edge POS rel_VK (t) and the progression of the relative position of said trailing edge POS rel_HK (t) are axisymmetric to each other; and
wherein said trailing edge POS rel_HK (t) extends in a range around a geometrically determined progression of a reflected curve that is +/−20% of a value of the relative position of said leading edge POS rel_VK (t).

2. The fan wheel according to claim 1 , wherein:
said hub cup is at least substantially cylindrical and rotationally symmetrical around an axis of rotation of the fan wheel; and
R i is the outer radius of said hub cup and an inner radius of said at least one blade.

3. The fan wheel according to claim 1 , wherein
the relative position of said leading edge POS rel_VK (t) is referenced to a third point that is a forward-most point in the direction of rotation of the fan wheel at a transition from said hub cup to said blade; and/or
the relative position of said trailing edge POS rel_HK (t) is referenced to a fourth point, which is a rearward-most point in the direction of rotation of the fan wheel at the transition from the hub cup to said blade.

4. The fan wheel according to claim 1 , wherein said blade, viewed in the direction of rotation, is a backward-swept blade.

5. The fan wheel according to claim 1 , further comprising a substantially circular outer ring disposed to link respective tips of said plurality of blades together.

6. The fan wheel according to claim 1 , wherein:
the progression of the relative position of said trailing edge POS rel_HK (t) has a maximum in a range of 80% to 100% of the relative unit radius t(r) of said blade;
and/or the progression of the relative position of said leading edge POS rel_VK (t) has a minimum in a range of 80% to 100% of the relative unit radius t(r) of said blade.

7. The fan wheel according to claim 6 , wherein:
the progression of the relative position of said trailing edge POS rel_HK (t) has the maximum in a range of 90% to 100% of the relative unit radius t(r) of said blade;
and/or the progression of the relative position of said leading edge POS rel_VK (t) has the minimum in a range of 90% to 100% of the relative unit radius t(r) of said blade.

8. The fan wheel according to claim 7 , wherein:
the progression of the relative position of said trailing edge POS rel_HK (t) has a local maximum in a range of 92.5% to 97.5% of the relative unit radius t(r) of said blade; and/or
the progression of the relative position of said leading edge POS rel_VK (t) has a local minimum in a range of 92.5% to 97.5% of the relative unit radius t(r) of said blade.

9. The fan wheel according to claim 6 , wherein:
the progression of the relative position of said trailing edge POS rel_HK (t) has no low points or at most one low point in the y-direction after maximum in a radial direction; and/or
the progression of the relative position of said leading edge POS rel_VK (t) has no high points or at most one high point in the y-direction after the minimum in the radial direction.

10. The fan wheel according to claim 1 , wherein said trailing edge POS rel_HK (t) extends in a range around the geometrically determined progression of the reflected curve that is +/−10% of the value of the relative position of said leading edge POS rel_VK (t).

11. The fan wheel according to claim 1 , wherein the progression of the relative position of said leading edge POS rel_VK (t), as a function of the relative unit radius t(r), satisfies the following condition:

POS

rel
⁢

⁢
_
⁢

⁢
VK

⁡

(
t
)

=

-

(

A
1

⁢

t
2

Assignees

• Brose Fahrzeugteile

Inventors

• Froh Christian
• Mauss Michael

Classifications

• F04D29/384

  characterised by form · CPC title

• F01P5/06

  Guiding or ducting air to, or from, ducted fans · CPC title

• F01P5/02

  Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers · CPC title

• F04D29/663

  Sound attenuation · CPC title

• F04D29/324

  Blades · CPC title