Fan and fan module

Patent metadata

Field	Value
Publication number	US-10018204-B2
Application number	US-201514956566-A
Country	US
Kind code	B2
Filing date	Dec 2, 2015
Priority date	Dec 2, 2015
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

The invention relates to a fan and a fan module, wherein the fan comprises: a fan hub which comprises a fan rotation axis to rotate in a predetermined direction, a plurality of fan blades comprising a lower end and an upper end, wherein each fan blade is attached with its lower end to the fan hub and extends radially outwardly from the fan hub, wherein each fan blade comprises a lower back sweep portion and an upper forward sweep portion, wherein a maximum ratio r/R of the lower back sweep portion is at least 0.90, wherein r is the local radius of a point of the fan blade edge, and R is the radius of the upper end of the fan blade.

First claim

The invention claimed is:

1. A fan, the fan comprising:
a fan hub which comprises a fan rotation axis to rotate in a predetermined direction,
a plurality of fan blades comprising a lower end and an upper end, wherein each fan blade is attached with its lower end to the fan hub and extends radially outwardly from the fan hub, wherein each fan blade comprises a lower back sweep portion and an upper forward sweep portion, wherein a maximum ratio r/R of the lower back sweep portion is at least 0.90, wherein r is the local radius of a point of a fan blade edge, and R is the radius of the upper end of the fan blade, wherein the ratio of camber length/chord length of the fan blade decreases from 0.053 to 0.041 from the lower end to the upper end of the fan blade, wherein the camber length is the maximum distance between chord and mean line at the radial location (r).

2. The fan of claim 1 ,
wherein the maximum ratio r/R of the lower back sweep portion is less than or equal 0.95.

3. The fan of claim 2 ,
wherein a blade angle (θ) of the fan blade decreases with increasing ratio r/R, wherein the blade angle (θ) is at least −16° at the upper end of the fan blade or at least 16° at the lower end of the fan blade, wherein the blade angle (θ) is the angle between the mean line of the fan blade and a plane which is perpendicular to the rotation axis of the fan, wherein the mean line and the plane intersect at the point of the fan blade leading edge at the radial location (r).

4. The fan of claim 1 ,
wherein the ratio r/R of each fan blade is between 0.3 and 1.00.

5. The fan of claim 1 ,
wherein the maximum sweep angle (T) of the leading edge of the fan blade is at least 50° or the minimum sweep angle (T) of the leading edge of the fan blade is at least −2.0°, wherein the sweep angle (T) is the angle between a radial line (r 18 ) through a point of the fan blade leading edge at the radial location (r) and a tangent to the leading edge at said point.

6. The fan of claim 1 ,
wherein in the forward sweep region the sweep angle (T) of the leading edge of the fan blade ranges between T≤0° and T=−35.6°, and wherein the ratio r/R of the forward sweep region is between r/R≥0.956 and 1.00.

7. The fan of claim 1 ,
wherein the ratio of maximum blade thickness/chord length of the fan blade increases with increasing ratio r/R and ranges from 0.069 to 0.111, wherein the ratio of the maximum blade thickness/chord length of the fan blade is 0.111 at the upper end of the fan blade, wherein the chord length is the distance between the point of the fan blade leading edge and the point of the fan blade trailing edge at the radial location (r), and wherein the maximum blade thickness is the maximum thickness of the fan blade at the radial location (r).

8. The fan of claim 1 ,
wherein each blade has at least the parameters defined by

Blade

angle

r/R
θ

0.373
16.4

0.442
11.8

0.512
8.4

0.582
5.6

0.651
3.2

0.721
1.3

0.791
−0.2

0.861
−1.4

0.930
−1.9

0.956
−3.9

1.00
−16.2

wherein
r is the local radius of a point of the fan blade edge,
R is the radius of the upper end of the fan blade, and
θ is the blade angle between the mean line of the fan blade and a plane which is perpendicular to the rotation axis of the fan, wherein the mean line and the plane intersect at the point of the fan blade leading edge at the radial location r.

9. The fan of claim 1 ,
wherein each blade has at least the parameters defined by

Sweep

angle

r/R
T

0.373
−2.7

0.442
0.1

0.512
4.5

0.582
13.2

0.651
24.3

0.721
34.7

0.791
42.5

0.861
48.6

0.930
51.6

0.956
0

1.00
−35.6

wherein
r is the local radius of a point of the fan blade edge,
R is the radius of the upper end of the fan blade, and
T is the sweep angle between a radial line through the point of the fan blade leading edg

Assignees

• Brose Fahrzeugteile

Inventors

• Hong Tao
• Mudge Derek

Classifications

• F04D29/384 Primary

  characterised by form · CPC title