U.S. patent application number 12/778477 was filed with the patent office on 2011-06-23 for fan device.
This patent application is currently assigned to Yen Sun Technology Corp.. Invention is credited to Chien-Jung Chen, Chih-Tsung Hsu, Hsin-Hsien Wu.
Application Number | 20110150639 12/778477 |
Document ID | / |
Family ID | 42575795 |
Filed Date | 2011-06-23 |
United States Patent
Application |
20110150639 |
Kind Code |
A1 |
Chen; Chien-Jung ; et
al. |
June 23, 2011 |
Fan Device
Abstract
A fan device includes: a fan housing configured with a receiving
space defined among opposite top and bottom walls, and a
surrounding side wall; and a fan impeller mounted in the receiving
space, disposed adjacent to an air outlet in the top wall and
operable to rotate about a central axis transverse to the top and
bottom walls of the fan housing. The fan impeller includes a hub
body disposed coaxially with the central axis, and a plurality of
angularly spaced apart fan blades extending outwardly and radially
from the hub body. An angular distance between each adjacent pair
of the fan blades is different from that of any other adjacent pair
of the fan blades.
Inventors: |
Chen; Chien-Jung; (Kaohsiung
County, TW) ; Hsu; Chih-Tsung; (Kaohsiung County,
TW) ; Wu; Hsin-Hsien; (Kaohsiung County, TW) |
Assignee: |
Yen Sun Technology Corp.
|
Family ID: |
42575795 |
Appl. No.: |
12/778477 |
Filed: |
May 12, 2010 |
Current U.S.
Class: |
415/182.1 |
Current CPC
Class: |
F04D 29/544 20130101;
F04D 29/666 20130101; F04D 25/08 20130101; F04D 29/667 20130101;
F04D 25/0613 20130101; F04D 29/328 20130101 |
Class at
Publication: |
415/182.1 |
International
Class: |
F04D 11/00 20060101
F04D011/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 18, 2009 |
TW |
098143619 |
Claims
1. A fan device comprising: a fan housing configured with a
receiving space, and having a bottom wall formed with an air inlet
in spatial communication with said receiving space, a top wall
formed with an air outlet in spatial communication with said
receiving space, and a surrounding side wall transverse to and
interconnecting said top and bottom walls, and cooperating with
said top and bottom walls to define said receiving space
thereamong; and a fan impeller mounted in said receiving space in
said fan housing, disposed adjacent to said air outlet in said top
wall of said fan housing, and operable to rotate about a central
axis that is transverse to said top and bottom walls of said fan
housing, said fan impeller including a hub body disposed coaxially
with the central axis, and a plurality of angularly spaced apart
fan blades extending outwardly and radially from said hub body, an
angular distance between each adjacent pair of said fan blades
being different from that of any other adjacent pair of said fan
blades.
2. The fan device as claimed in claim 1, further comprising an
air-guiding unit mounted fixedly in said receiving space in said
fan housing and disposed adjacent to said air inlet in said bottom
wall of said fan housing, said air-guiding unit including a center
connecting member disposed coaxially with the central axis, and a
plurality of air-guiding blades angularly spaced apart from each
other and interconnecting said central connecting member and said
surrounding side wall of said fan housing, an angular distance
between each adjacent pair of said air-guiding blades being
different from that of any other adjacent pair of said air-guiding
blades.
3. The fan device as claimed in claim 2, wherein said air-guiding
unit further includes a plurality of auxiliary air-guiding blades
extending inwardly and radially from said surrounding side wall of
said fan housing toward said central connecting member, each of
said auxiliary air-guiding blades being disposed between a
corresponding adjacent pair of said air-guiding blades and being
spaced apart from the corresponding adjacent pair of said
air-guiding blades and said central connecting member.
4. The fan device as claimed in claim 3, wherein said auxiliary
air-guiding blades of said air-guiding unit have the same
length.
5. The fan device as claimed in claim 3, wherein each of said
auxiliary air-guiding blades of said air-guiding unit has a length
different from that of any other one of said auxiliary air-guiding
blades.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority of Taiwanese Application
No. 098143619, filed on Dec. 18, 2009.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates to a fan device, and more particularly
to a fan device capable of reducing acoustic noise.
[0004] 2. Description of the Related Art
[0005] A conventional fan device includes a fan impeller mounted in
a fan housing. The fan impeller includes a hub body, and a
plurality of angularly spaced apart fan blades extending outwardly
and radially from the hub body. However, in such a configuration,
greater acoustic noise occurs during rotation of the fan impeller
at a speed within a certain speed range.
SUMMARY OF THE INVENTION
[0006] Therefore, an object of the present invention is to provide
a fan device that can overcome the aforesaid drawback of the prior
art.
[0007] According to the present invention, a fan device
comprises:
[0008] a fan housing configured with a receiving space, and having
a bottom wall formed with an air inlet in spatial communication
with the receiving space, a top wall formed with an air outlet in
spatial communication with the receiving space, and a surrounding
side wall transverse to and interconnecting the top and bottom
walls, and cooperating with the top and bottom walls to define the
receiving space thereamong; and
[0009] a fan impeller mounted in the receiving space in the fan
housing, disposed adjacent to the air outlet in the top wall of the
fan housing, and operable to rotate about a central axis that is
transverse to the top and bottom walls of the fan housing, the fan
impeller including a hub body disposed coaxially with the central
axis, and a plurality of angularly spaced apart fan blades
extending outwardly and radially from the hub body, an angular
distance between each adjacent pair of the fan blades being
different from that of any other adjacent pair of the fan
blades.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Other features and advantages of the present invention will
become apparent in the following detailed description of the
preferred embodiments with reference to the accompanying drawings,
of which:
[0011] FIG. 1 is a schematic top view showing the first preferred
embodiment of a fan device according to the present invention;
[0012] FIG. 2 is a schematic sectional view of the first preferred
embodiment taken along line II-II in FIG. 1;
[0013] FIG. 3 is a schematic bottom view showing the second
preferred embodiment of a fan device according to the present
invention;
[0014] FIG. 4 is a perspective view showing the second preferred
embodiment without a fan impeller;
[0015] FIG. 5 is a partly schematic sectional view showing the
second preferred embodiment;
[0016] FIG. 6 is a schematic top view showing the third preferred
embodiment of a fan device according to the present invention
without a fan impeller; and
[0017] FIG. 7 is a schematic top view showing a variation of the
third preferred embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0018] Before the present invention is described in greater detail,
it should be noted that like elements are denoted by the same
reference numerals throughout the disclosure.
[0019] Referring to FIGS. 1 and 2, the first preferred embodiment
of a fan device according to the present invention is shown to
include a fan housing 1, and a fan impeller 2.
[0020] The fan housing 1 is configured with a receiving space 10,
and has a bottom wall 11, a top wall 12 and a surrounding side wall
13. The bottom wall 11 is formed with an air inlet 111 in spatial
communication with the receiving space 10. The top wall 12 is
formed with an air outlet 121 in spatial communication with the
receiving space 10. The surrounding side wall 13 is transverse to
and interconnects the top and bottom walls 12, 11, and cooperates
with the top and bottom walls 12, 11 to define the receiving space
10 thereamong. In this embodiment, the fan housing 1 further
includes a connecting member 14 and a plurality of connecting ribs
15. The connecting member 14 is placed in the receiving space 10,
and is disposed adjacent to the air inlet 111. The connecting ribs
15 interconnect the connecting member 14 and the surrounding side
wall 131.
[0021] The fan impeller 2 is mounted in the receiving space 10 in
the fan housing 1, is disposed adjacent to the air outlet 121 in
the top wall 12 of the fan housing 1, and is operable to rotate
about a central axis (X) that is transverse to the top and bottom
walls 12, 11. The fan impeller 2 includes a hub body 21, and a
plurality of fan blades 22 extending outwardly and radially from
the hub body 21. It is noted that an angular distance (.PHI.)
between each adjacent pair of the fan blades 22 is different from
that of any other adjacent pair of the fan blades 22. An air
passage is formed between each adjacent pair of the fan blades
22.
[0022] In use, rotation of the fan impeller 2 draws air to flow
from the air inlet 111 toward the air outlet 121 through the air
passages, as indicated by solid-line arrows in FIG. 2.
[0023] Since the angular distances (.PHI.) are different from each
other, noise with different frequencies occurs when air flows
through the air passages, thereby avoiding accumulation of noise
with the same frequency. According to experimental measurement
results, acoustic noise about 25.1 dB caused by the fan device of
the present invention during operation is less than that (about
45.9 dB) of the conventional fan device with angularly equidistant
fan blades. Therefore, the fan device of the present invention can
be operated with reduced acoustic noise.
[0024] FIGS. 3 to 5 illustrate the second preferred embodiment of a
fan device according to this invention, which is a modification of
the first preferred embodiment. As composed to the first preferred
embodiment, the connecting member 14 and the connecting ribs 15 are
dispensed with. Furthermore, the fan device further includes an
air-guiding unit 3.
[0025] The air-guiding unit 3 is mounted fixedly in the receiving
space 10 in the fan housing 1, and is disposed adjacent to the air
inlet 111 in the bottom wall 11 of the fan housing 1. The
air-guiding unit 3 includes a center connecting member 31 disposed
coaxially with the central axis (X) , and a plurality of
air-guiding blades angularly spaced apart from each other and
interconnecting the central connecting member 31 and the
surrounding side wall 13 of the fan housing 1. An angular distance
(.theta.) between each adjacent pair of the air-guiding blades 32
is different from that of any other adjacent pair of the
air-guiding blades 32. In this embodiment, the center connecting
member 31 includes a circular cap body 312, and a tube body 311
extending integrally from the cap body 312 toward the hub body 21
and disposed coaxially with the central axis (X).
[0026] When the fan impeller 2 is driven to rotate, air flowing
from the air inlet 111 is guided by the air-guiding blades 32, and
then flows toward the air outlet 121 through the air passages, as
indicated by solid-line arrows in FIG. 5. Therefore, due to the
presence of the air-guiding unit 3, air pressure produced by the
fan device can be enhanced. Furthermore, since the angular
distances (.theta.) are different from each other, acoustic noise
caused by the fan device can be further reduced.
[0027] FIG. 6 illustrates the third preferred embodiment of a fan
device according to this invention, which is a modification of the
second preferred embodiment. As compared to the second preferred
embodiment, the air-guiding unit 3' further includes a plurality of
auxiliary air-guiding blades 33 extending inwardly and radially
from the surrounding side wall 13 of the fan housing 1 toward the
central connecting member 31. Each auxiliary air-guiding blade 33
is disposed between a corresponding adjacent pair of the
air-guiding blades 32, and is spaced apart from the corresponding
adjacent pair of the air-guiding blades 32 and the central
connecting member 31. In this embodiment, the auxiliary air-guiding
blades 33 have the same length.
[0028] FIG. 7 illustrates a variation of the third preferred
embodiment, wherein each of the auxiliary air-guiding blades 33 of
the air-guiding unit 3' has a length different from that of any
other one of the auxiliary air-guiding blades 33.
[0029] While the present invention has been described in connection
with what are considered the most practical and preferred
embodiments, it is understood that this invention is not limited to
the disclosed embodiments but is intended to cover various
arrangements included within the spirit and scope of the broadest
interpretation so as to encompass all such modifications and
equivalent arrangements.
* * * * *