U.S. patent application number 11/334487 was filed with the patent office on 2007-07-19 for cooling fan for radiator.
Invention is credited to Yi Hsun Lee.
Application Number | 20070166166 11/334487 |
Document ID | / |
Family ID | 38263352 |
Filed Date | 2007-07-19 |
United States Patent
Application |
20070166166 |
Kind Code |
A1 |
Lee; Yi Hsun |
July 19, 2007 |
Cooling fan for radiator
Abstract
A cooling fan is disclosed to have a hollow hub, and a plurality
of blades respectively radially extending from and equiangularly
spaced around the periphery the periphery of the hollow hub, the
blades each having a distal end joined to one another to form a
rim.
Inventors: |
Lee; Yi Hsun; (Taipei,
TW) |
Correspondence
Address: |
ROSENBERG, KLEIN & LEE
3458 ELLICOTT CENTER DRIVE-SUITE 101
ELLICOTT CITY
MD
21043
US
|
Family ID: |
38263352 |
Appl. No.: |
11/334487 |
Filed: |
January 19, 2006 |
Current U.S.
Class: |
416/189 |
Current CPC
Class: |
F04D 29/384 20130101;
F04D 29/326 20130101 |
Class at
Publication: |
416/189 |
International
Class: |
B63H 1/16 20060101
B63H001/16 |
Claims
1. A cooling fan comprising a hollow hub, and a plurality of blades
respectively radially extending from the periphery of said hollow
hub and equiangularly spaced around the periphery of said hollow
hub, wherein said blades each have a distal end joined to one
another, forming a rim.
2. The cooling fan as claimed in claim 1, wherein the connection
area between the distal ends of each two adjacent blades is
chamfered.
3. The cooling fan as claimed in claim 1, which is installed in a
top side of a radiator of a motor vehicle.
4. The cooling fan as claimed in claim 1, which is installed in a
bottom side of a radiator of a motor vehicle.
5. The cooling fan as claimed in claim 1, which is coupled to a
motor and rotatable by said motor.
6. The cooling fan as claimed in claim 1, wherein hollow hub and
said blades are molded from plastics.
7. The cooling fan as claimed in claim 1, wherein said hollow hub
and said blades are made in integrity.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to electric fans and more
particularly, to a cooling fan for use in a motor vehicle to
dissipate heat from the radiator of the motor vehicle.
[0003] 2. Description of the Related Art
[0004] In a motor vehicle, a cooling fan is mounted on the radiator
and driven by a motor to induce currents of air toward the
radiator, thereby dissipating heat from the radiator into the
outside open air.
[0005] When selecting a cooling fan, it is necessary to consider
the performance of the cooling fan subject to the factors of air
volume, noise level, wind pressure, type of bearing, and service
life. The factor of air volume has a great concern with the
diameter, thickness, revolving speed and blade design. Normally, a
cooling fan of a relatively higher revolving speed provides a
relatively heat dissipation effect. Fan blade thickness also
determines the air volume. However, it is difficult to achieve a
satisfactory heat dissipation effect while keeping the cooling fan
in silence.
[0006] FIG. 1 shows a conventional cooling fan for this purpose.
The cooling fan is fixedly fastened to the radiator and rotated by
a motor to induce currents of air toward the radiator, carrying
heat away from the radiator. The necessary working voltage for the
motor is obtained from the car battery through the control of a
control panel. According to this design, the cooling fan 12
comprises a plurality blades 14 equiangularly spaced around the
hub. The blades 14 commonly have a smooth outer surface, and are
spaced from one another at a gap. The gap between each two blades
14 wastes much workable air. Further, current vehicle radiators are
made relatively finer than ever. Due to limited installation space,
the size of the cooling fan for use with a radiator in a motor
vehicle is limited. According to the aforesaid conventional design,
the smooth surface blades 14 of the cooling fan 12 cannot induce
sufficient air volume to dissipate heat from the radiator
efficiently.
[0007] Therefore, it is desirable to provide a cooling fan for
vehicle radiator that eliminates the aforesaid problem.
SUMMARY OF THE INVENTION
[0008] The present invention has been accomplished under the
circumstances in view. It is one object of the present invention to
provide a cooling fan for vehicle radiator, which causes a high
wind pressure during operation, thereby achieving a satisfactory
heat dissipation effect. It is another object of the present
invention to provide a cooling fan for vehicle radiator, which
produces little noise during operation.
[0009] To achieve these and other objects of the present invention,
the cooling fan comprises a hollow hub, and a plurality of blades
respectively radially extending from and equiangularly spaced
around the periphery of the hollow hub. The blades have the
respective distal end joined to one another, thereby forming a rim.
The rim that is formed of the distal ends of the blades enhances
the wind pressure when the blades catching air during rotation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is an elevational view of a cooling fan according to
the prior art.
[0011] FIG. 2 is a schematic elevational view of a cooling fan
according to the present invention.
[0012] FIG. 3 is a front view of the cooling fan according to the
present invention.
[0013] FIG. 4 is a side view of the cooling fan according to the
present invention.
[0014] FIG. 5 is a schematic drawing showing one installation
example of the present invention.
[0015] FIG. 6 is a schematic drawing showing another installation
example of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0016] Referring to FIGS. 2.about.4, a cooling fan 22 in accordance
with the present invention is shown comprising a hollow hub 24, and
a plurality of blades 26 radially extending from and equiangularly
arranged around the periphery of the hollow hub 24. The blades 26
each have the distal end respectively connected to one another,
forming a rim that reinforces the structural strength of the
cooling fan 22. Further, the connection between each two adjacent
blades 26 is chamfered. The connecting portion between each
adjacent blades 26 gives an extended fan blade area that increases
the wind pressure when the cooling fan 22 is being rotated by a
motor (not shown) to catch air, thereby enhancing heat exchange
action of intake air with the radiator (not shown). The design of
the invention also reduces noises. As it is well known that fan
noise level has a great concern with the friction force between the
blades and the air. Further, vibration of the cooling fan itself
results in a high noise. The invention eliminates these problems.
Because the distal ends of the blades 26 are joined together, the
cooling fan 22 does not vibration when rotating, thereby reducing
the noise level. Further, because the distal ends of the blades 26
are joined together, the distal ends of the blades 26 can catch air
during rotation of the blades 26 with the hollow hub 24, thereby
increasing the wind pressure and improving the performance.
[0017] According to fan affinity laws, the performance of a fan can
be calculated by changing the test parameters during rotation of
the fan. The change of the test parameters is applicable only to
the same type of fans on the same performance curve. The
relationship between wind pressure (P) and air density (.gamma.)
can be expressed as follows: P=.gamma.
[0018] According to the aforesaid equation, wind pressure is
indirectly proportional to air density Because the blades 26 of the
cooling fan 22 according to the present invention can catch air of
relatively higher density, the invention can obtain a relatively
higher air pressure.
[0019] The cooling fan 22 can be installed in the top side of the
radiator 32, as shown in FIG. 5. Alternatively, the cooling fan 22
can be installed in the bottom side of the radiator 32, as shown in
FIG. 6. When started, the cooling fan 22 induces a big volume of
air toward the radiator 32 to dissipate heat from the radiator 32
into the outside open air efficiently.
[0020] A prototype of cooling fan has been constructed with the
features of FIGS. 2.about.6. The cooling fan functions smoothly to
provide all of the features discussed earlier.
[0021] Although a particular embodiment of the invention has been
described in detail for purposes of illustration, various
modifications and enhancements may be made without departing from
the spirit and scope of the invention.
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