U.S. patent application number 11/407099 was filed with the patent office on 2007-06-28 for fan and fan housing thereof.
This patent application is currently assigned to DELTA ELECTRONICS, INC.. Invention is credited to Wen-Shi Huang, Po-Hao Yu.
Application Number | 20070147992 11/407099 |
Document ID | / |
Family ID | 38193964 |
Filed Date | 2007-06-28 |
United States Patent
Application |
20070147992 |
Kind Code |
A1 |
Yu; Po-Hao ; et al. |
June 28, 2007 |
Fan and fan housing thereof
Abstract
A fan includes an impeller, a fan housing and a motor. The fan
housing includes a frame, a base and a plurality of stationary
blade sets. The base is disposed inside the frame. Each of the
stationary blade sets includes a plurality of stationary blades
disposed between the frame and the base. The motor is disposed onto
the base to drive the impeller to rotate. At least one stationary
blade of one stationary blade set has a different shape, dimension
or inclined angle from that of at least one stationary blade of
another stationary blade set.
Inventors: |
Yu; Po-Hao; (Taoyuan Hsien,
TW) ; Huang; Wen-Shi; (Taoyuan Hsien, TW) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Assignee: |
DELTA ELECTRONICS, INC.
|
Family ID: |
38193964 |
Appl. No.: |
11/407099 |
Filed: |
April 20, 2006 |
Current U.S.
Class: |
415/191 |
Current CPC
Class: |
F04D 29/544 20130101;
F04D 25/0613 20130101 |
Class at
Publication: |
415/191 |
International
Class: |
F01D 9/00 20060101
F01D009/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 23, 2005 |
TW |
094145985 |
Claims
1. A fan housing comprising: a frame; a base disposed inside the
frame; and a plurality of stationary blade sets, each of which
comprises a plurality of stationary blades disposed between the
frame and the base; wherein at least one stationary blade of one
stationary blade set has a different shape, dimension or inclined
angle from that of at least one stationary blade of another
stationary blade set.
2. The fan housing according to claim 1, wherein the stationary
blades of each stationary blade set are different from each
other.
3. The fan housing according to claim 1, wherein the intervals
between the stationary blades of the stationary blade sets are not
all the same.
4. The fan housing according to claim 1, wherein each stationary
blade set has the same number of the stationary blades.
5. The fan housing according to claim 1, wherein the shapes,
dimensions or inclined angles of other stationary blades of one
stationary blade set are the same as those of other stationary
blades of another stationary blade set.
6. The fan housing according to claim 1, wherein the stationary
blades of each stationary blade set have different chord lengths
thereof.
7. The fan housing according to claim 6, wherein the shortest chord
length is less than or equal to 80% of the longest chord
length.
8. The fan housing according to claim 1, wherein the stationary
blades of each stationary blade set has different inclined angles
thereof.
9. The fan housing according to claim 8, wherein the inclined
angles range from -30 degrees to 30 degrees.
10. The fan housing according to claim 1, wherein the stationary
blades of each stationary blade set have different aerofoils
thereof.
11. The fan housing according to claim 1, wherein the stationary
blades of each stationary blade set are all the same.
12. The fan housing according to claim 1, wherein the stationary
blades of one stationary blade set are arbitrarily or regularly
arranged with the stationary blades of another stationary blade
set.
13. A fan comprising: an impeller, a fan housing comprising a
frame, a base and a plurality of stationary blade sets, wherein the
base is disposed inside the frame, and each of the stationary blade
sets comprises a plurality of stationary blades disposed between
the frame and the base; and a motor disposed onto the base to drive
the impeller to rotate; wherein at least one stationary blade of
one stationary blade set has a different shape, dimension or
inclined angle from that of at least one stationary blade of
another stationary blade set.
14. The fan according to claim 13, wherein the stationary blades of
one stationary blade set are arbitrarily or regularly arranged with
the stationary blades of another stationary blade set.
15. The fan according to claim 13, wherein the intervals between
the stationary blades of the stationary blade sets are not all the
same.
16. The fan according to claim 13, wherein the chord lengths of the
stationary blades of one stationary blade set are different from
those of the stationary blades of another stationary blade set.
17. The fan according to claim 16, wherein the shortest chord
lengths are less than or equal to 80% of the longest chord
lengths.
18. The fan according to claim 13, wherein the inclined angles of
the stationary blades of one stationary blade set are different
from those of the stationary blades of another stationary blade
set.
19. The fan according to claim 18, wherein the inclined angles
range from -30 degrees to 30 degrees.
20. The fan according to claim 13, wherein the aerofoils of the
stationary blade of one stationary blade set is different from
those of the stationary blade of another stationary blade set.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of Invention
[0002] The present invention relates to a fan and a fan housing
thereof, and more particularly to a fan and a fan housing thereof
capable of eliminating noise.
[0003] 2. Related Art
[0004] Accompanying with the rapid development of the electronic
products which tend to high functionality, high frequency, and fast
response, much more heat is generated by the electronic products.
The heat can result in instable operation and, therefore, affect
the reliability of the electronic products. In general, a fan is
often used as a heat-dissipating device for the electronic
product.
[0005] As shown in FIG. 1, a conventional fan 1 includes an
impeller 11, a motor 12 and a fan housing 13. The fan housing 13
includes a frame 131, a plurality of stationary blades 132 and a
base 133. Two ends of the stationary blade 132 are respectively
connected with the frame 131 and the base 133. The motor 12 is
disposed onto the base 133 to drive the impeller 11 to rotate. FIG.
2a is a schematic diagram of the fan housing 13, and FIG. 2b is a
schematic diagram of the aerofoil of the stationary blades 132. The
aerofoils, as well as the intervals, of the stationary blades 132
are the same.
[0006] The thermal dissipating efficiency of the fan can be raised
by guiding the airflow through the stationary blades. However, a
high-frequency noise is unpleasantly generated due to the high
rotation of the fan. One of the causes is that the aerofoils and
the intervals of the stationary blades are the same, which causes
the same pressure variation on the surfaces of the stationary
blades during the air flowing through the stationary blades. The
pressure variation on the surface of the stationary blade is one of
the sources of noise, and the same pressure variation on each
stationary blade will result in the noise accumulation. Lessening
stationary blades or replacing stationary blades with ribs just can
slightly eliminate the noise accumulation, but is disadvantageous
to the thermal dissipating efficiency.
[0007] It is thus imperative to provide a fan and a fan housing
thereof capable of solving high-frequency noise caused from the
noise accumulation without affecting thermal dissipating efficiency
thereof.
SUMMARY OF THE INVENTION
[0008] In view of the foregoing, the present invention provides a
fan and a fan housing thereof capable of eliminating high-frequency
noise without affecting thermal dissipating efficiency thereof.
[0009] To achieve the above, a fan housing according to the present
invention includes a frame, a base and a plurality of stationary
blade sets. The base is disposed inside the frame. Each of the
stationary blade sets includes a plurality of stationary blades
disposed between the frame and the base. At least one stationary
blade of one stationary blade set has a different shape, dimension
or inclined angle from that of at least one stationary blade of
another stationary blade set.
[0010] To achieve the above, a fan according to the present
invention includes an impeller, a fan housing and a motor. The fan
housing includes a frame, a base and a plurality of stationary
blade sets. The base is disposed inside the frame. Each of the
stationary blade sets includes a plurality of stationary blades
disposed between the frame and the base. The motor is disposed onto
the base to drive the impeller to rotate. At least one stationary
blade of one stationary blade set has a different shape, dimension
or inclined angle from that of at least one stationary blade of
another stationary blade set.
[0011] As mentioned above, a fan and a fan housing thereof
according to the present invention utilizes at least two sets of
stationary blades with different shape, dimension or inclined angle
from each other. The intervals between the stationary blades can
also be different such that different pressure variations are
formed on the surfaces of the stationary blades during the air
flowing through the stationary blades. Compared with the prior art,
the accumulation noise according to the present invention can be
reduced, i.e. high-frequency noise can be eliminated, and thermal
dissipating efficiency of the fan will not be affected.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The present invention will become more fully understood from
the detailed description given herein below illustration only, and
thus are not limitative of the present invention, and wherein:
[0013] FIG. 1 is a three-dimensional exploded diagram showing a
conventional fan;
[0014] FIG. 2a is a schematic diagram showing the conventional fan
housing;
[0015] FIG. 2b is a schematic diagram showing the aerofoil and
arrangement of the conventional stationary blades;
[0016] FIG. 3 is a three-dimensional exploded diagram showing a fan
according to a preferred embodiment of the present invention;
[0017] FIG. 4 is a back view showing the fan housing in FIG. 3;
[0018] FIG. 5 is a cross-sectional diagram showing the fan housing
in FIG. 3;
[0019] FIG. 6 is a schematic diagram showing the stationary blades
according to the present invention with different aerofoils;
[0020] FIG. 7 is a schematic diagram showing the stationary blades
according to the present invention with different chord
lengths;
[0021] FIG. 8 is a schematic diagram showing the stationary blades
according to the present invention with different aerofoils in
arbitrary arrangement; and
[0022] FIG. 9 is a schematic diagram showing the stationary blades
according to the present invention with different chord lengths in
regular arrangement.
DETAILED DESCRIPTION OF THE INVENTION
[0023] The present invention will be apparent from the following
detailed description, which proceeds with reference to the
accompanying drawings, wherein the same references relate to the
same elements.
[0024] As shown in FIG. 3, a fan 2 according to a preferred
embodiment of the present invention includes an impeller 21, a
motor 22 and a fan housing 23. In this embodiment, the fan 2 is an
axial fan. The fan housing 23 includes a frame 231, three
stationary blade sets 232, and a base 233 disposed inside the frame
231. In this embodiment, each of the stationary blade sets 232 has
two different stationary blades 2321 and 2322, and the total number
of the stationary blades 2321 and 2322 is six. The stationary
blades 2321 and 2322 of each stationary blade set 232 are disposed
between the frame 231 and the base 233. That is, two ends of the
stationary blade are respectively connected with the frame 231 and
the base 233. The frame 231, the base 233 and the stationary blade
sets 232 can be integrally formed. The motor 22 is disposed onto
the base 233, which drives the impeller 21 to rotate by magnetic
interaction.
[0025] FIG. 4 is a back view of the fan housing 23, and FIG. 5 is a
cross-sectional diagram of the fan housing 23. As shown in FIG. 4,
the stationary blade sets 232 are arranged in order such that the
stationary blades 2321 and 2322 are alternately arranged. In
addition, the stationary blades 2321 and 2322 are connected with
the base 233 in different inclined angles. In this embodiment, the
inclined angle .angle.1 of the stationary blades 2321 is different
from the inclined angle .angle.2 of the stationary blades 2322.
Preferably, the inclined angles range from -30 degrees to 30
degrees. The interval angles .angle.S of two adjacent stationary
blades can also be different; however, the minimum interval angle
is preferably not less than 45 degrees. As shown in FIG. 5, the
aerofoils of the stationary blades 2321 and 2322 are different, and
the chord lengths thereof are also different. The shortest chord
length S2 of the stationary blades 2322 is not greater than 80% of
the longest chord length S1 of the stationary blades 2321.
[0026] Of course, as shown in FIG. 6, the stationary blades 2321
and 2322 of each stationary blade set 232 can be merely different
in aerofoils. Alternately, the stationary blades 2321 and 2322 of
each stationary blade set 232 can be merely different in chord
lengths as shown in FIG. 7.
[0027] In addition, the same stationary blades can be grouped as
one stationary blade set. As shown in FIG. 8, the stationary blade
set 234 has a plurality of same stationary blades 2341 and the
stationary blade set 235 has a plurality of another same stationary
blades 2351. The aerofoils of the stationary blades 2341 and 2351
are different, and the stationary blades 2341 and 2351 are
arbitrarily arranged with one another. The stationary blades 2341
and 2351 can also have different inclined angles or chord lengths
thereof. In addition, the intervals between the stationary blades
2341 and 2351 can further be different. As shown in FIG. 9, the
chord lengths of the stationary blades 2341 and the stationary
blades 2351 are different. The major difference from FIG. 8 is that
the stationary blades 2341 and 2351 are regularly arranged with one
another. Similarly, the stationary blades 2341 and 2351 can have
different inclined angles or chord lengths except the aerofoil, and
the intervals between the stationary blades 2341 and 2351 can also
be different.
[0028] In summary, a fan and a fan housing thereof according to the
present invention utilizes at least two sets of stationary blades
with different shape, dimension or inclined angle from each other.
The intervals between the stationary blades can also be different
such that different pressure variations are formed on the surfaces
of the stationary blades during the air flowing through the
stationary blades. Compared with the prior art, the accumulation
noise according to the present invention can be reduced, i.e.
high-frequency noise can be eliminated, and thermal dissipating
efficiency of the fan will not be affected.
[0029] Although the present invention has been described with
reference to specific embodiments, this description is not meant to
be construed in a limiting sense. Various modifications of the
disclosed embodiments, as well as alternative embodiments, will be
apparent to persons skilled in the art. It is, therefore,
contemplated that the appended claims will cover all modifications
that fall within the true scope of the present invention.
* * * * *