U.S. patent application number 12/778429 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 | 20110150638 12/778429 |
Document ID | / |
Family ID | 42542887 |
Filed Date | 2011-06-23 |
United States Patent
Application |
20110150638 |
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; 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; and an air-guiding unit mounted
fixedly in the receiving space and disposed adjacent to an air
inlet in the bottom wall. The air-guiding unit includes a central
connecting member disposed axially with the central axis, and a
plurality of angularly spaced apart air-guiding blades
interconnecting the central connecting member and the surrounding
sidewall. An angular distance between each adjacent pair of the
air-guiding blades is different from that of any other adjacent
pair of the air-guiding 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: |
42542887 |
Appl. No.: |
12/778429 |
Filed: |
May 12, 2010 |
Current U.S.
Class: |
415/182.1 |
Current CPC
Class: |
F04D 29/328 20130101;
F04D 25/08 20130101; F04D 29/666 20130101; F04D 29/667 20130101;
F04D 25/0613 20130101; F04D 29/544 20130101 |
Class at
Publication: |
415/182.1 |
International
Class: |
F01D 1/00 20060101
F01D001/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 18, 2009 |
TW |
098143618 |
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; 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; and 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.
2. The fan device as claimed in claim 1, 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.
3. The fan device as claimed in claim 2, wherein said auxiliary
air-guiding blades of said air-guiding unit have the same
length.
4. The fan device as claimed in claim 2, 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.
5. The fan device as claimed in claim 1, wherein said fan impeller
includes: a hub body disposed coaxially with the central axis; and
a plurality of fan blades extending outwardly and radially from
said hub body and angularly spaced apart from each other, an
angular distance between each adjacent pair of said fan blades
being different from that of any other adjacent pair of said fan
blades.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority of Taiwanese Application
No. 098143618, 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 producing enhanced air pressure.
[0004] 2. Description of the Related Art
[0005] In order to enhance air pressure, a stator impeller is
applied to a fan. The stator impeller is mounted to a fan housing
of the fan, and includes a plurality of angularly equidistant
stator blades. An air-guiding channel is formed between an adjacent
pair of the stator blades. When a fan impeller of the fan is driven
to rotate, air flowing from the air inlet is guided by the stator
impeller to flow toward the fan impeller through the air-guiding
channels, thereby enhancing air pressure produced by the fan. As a
result, increased airflow amount can be attained. 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 produce enhanced air pressure and increased
airflow amount with reduced acoustic noise.
[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;
[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; and
[0010] an air-guiding unit mounted fixedly in the receiving space
in the fan housing and disposed adjacent to the air inlet in the
bottom wall of the fan housing, the 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 the central connecting member and
the surrounding side wall of the fan housing, an angular distance
between each adjacent pair of the air-guiding blades being
different from that of any other adjacent pair of the air-guiding
blades.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] 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:
[0012] FIG. 1 is a schematic bottom view showing the first
preferred embodiment of a fan device according to the present
invention;
[0013] FIG. 2 is a perspective view showing the first preferred
embodiment without a fan impeller;
[0014] FIG. 3 is a partly schematic sectional view showing the
first preferred embodiment;
[0015] FIG. 4 is a plot illustrating experimental measurement
results of acoustic noise generated by the prior art and the first
preferred embodiment;
[0016] FIG. 5 is a schematic top view showing the second preferred
embodiment of a fan device according to the present invention
without a fan impeller;
[0017] FIG. 6 is a schematic top view showing a variation of the
second preferred embodiment; and
[0018] FIG. 7 is a schematic top view showing the third preferred
embodiment of a fan device according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0019] 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.
[0020] Referring to FIGS. 1 to 3, the first preferred embodiment of
a fan device according to the present invention is shown to include
a fan housing 1, a fan impeller 2, and an air-guiding unit 3.
[0021] 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.
[0022] 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 of the fan housing 1. In this embodiment, 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. In this
embodiment, the fan blades 22 are angularly equidistant.
[0023] 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).
[0024] In operation, 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, as indicated
by solid-line arrows in FIG. 3.
[0025] In sum, due to the presence of the air-guiding unit 3, the
fan device of the present invention can produce enhanced air
pressure, thereby resulting in increased airflow amount. It is
noted that, since the angular distances (.theta.) are different
from each other, the fan device of the present invention generates
reduced acoustic noise during operation as compared to the prior
art, as shown in FIG. 4.
[0026] FIG. 5 illustrates the second preferred embodiment of a fan
device according to this invention, which is a modification of the
first preferred embodiment. Unlike the first 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 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.
[0027] FIG. 6 illustrates a variation of the second 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.
[0028] FIG. 7 illustrates the third preferred embodiment of a fan
device according to this invention, which is a modification of the
first preferred embodiment. Unlike the first preferred embodiment,
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.
[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.
* * * * *