U.S. patent application number 10/687114 was filed with the patent office on 2004-07-01 for structure of a cooling fan.
Invention is credited to Hsiao, Cheng-Fang.
Application Number | 20040126248 10/687114 |
Document ID | / |
Family ID | 29590870 |
Filed Date | 2004-07-01 |
United States Patent
Application |
20040126248 |
Kind Code |
A1 |
Hsiao, Cheng-Fang |
July 1, 2004 |
Structure of a cooling fan
Abstract
A cooling fan structure comprises a base and a ring stator
mounted in the center of the base such that a plurality of polar
claws are bent to form in the inner side of the ring stator in
conjunction with a plastic material. A coil is wound in the outer
side of the ring stator. A blade rotor seat is mounted in the base
such that the blade rotor seat circumvents the ring stator. A
magnetic ring rotor is mounted on an axis in the receiving space of
the ring stator such that the magnetic ring rotor is induced by the
coil of the ring stator to drive the blades.
Inventors: |
Hsiao, Cheng-Fang; (Hsichih
City, TW) |
Correspondence
Address: |
John S. Egbert
Harrison & Egbert
7th Floor
412 Main Street
Houston
TX
77002
US
|
Family ID: |
29590870 |
Appl. No.: |
10/687114 |
Filed: |
October 17, 2003 |
Current U.S.
Class: |
417/354 |
Current CPC
Class: |
F04D 25/0646
20130101 |
Class at
Publication: |
417/354 |
International
Class: |
F04B 017/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 27, 2002 |
CN |
02294186.X |
Claims
I claim:
1. A cooling fan structure comprising: a base; a ring stator
mounted in a center of the base and formed of a plurality of polar
claws and a coil, with said polar claws being disposed in an inner
side of said ring stator and being made integrally of a plastic
material with said ring stator, said coil being wound around an
outer side of said ring stator; a blade rotor seat provided with a
plurality of blades fastened therewith, said blade rotor seat being
mounted in said base such that said blade rotor seat circumvents
said ring stator; and a magnetic ring rotor mounted on an axis in a
receiving space of said ring stator such that said magnetic ring
rotor is induced by said coil of said ring stator to drive said
blades.
2. The cooling fan structure as defined in claim 1, wherein said
polar claws of said ring stator are arranged in a plurality of pole
numbers.
3. The cooling fan structure as defined in claim 1, wherein said
ring stator and said coil are arranged in two sets to form an upper
set and a lower set.
4. The cooling fan structure as defined in claim 3, wherein said
polar claws of each ring stator are made integrally of an
insulation plastic material as a ring seat for locating each coil.
Description
RELATED U.S. APPLICATIONS
[0001] Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
[0002] Not applicable.
REFERENCE TO MICROFICHE APPENDIX
[0003] Not applicable.
FIELD OF THE INVENTION
[0004] The present invention relates generally to a cooling device,
and more particularly to a cooling fan structure which is simple in
construction, and efficient in driving torque and ventilation.
BACKGROUND OF THE INVENTION
[0005] As shown in FIGS. 1-3, a prior art cooling fan structure
comprises a base 11, which is provided in the center with a stator
12. The stator 12 is formed of a plurality of coils 13 and polar
bars 14 on which the coils 13 are wound. A plurality of blades 16
are fastened with a rotor seat 17 which is provided in the inner
edge with a magnetic ring rotor 18. The magnetic ring rotor 18 is
induced by the coils 13 of the stator 12 to drive the blades 16.
The prior art cooling fan structure is defective in design in that
the winding is difficult and time-consuming, thereby resulting in
high rejection rate of the product.
[0006] As shown in FIGS. 4-6, another prior art cooling fan
structure comprises a base 21 and a stator 22 which is mounted in
the center of the base 21 and is formed of a coil 23. The coil 23
is circumvented by an upper polar piece 24 and a lower polar piece
25 in conjunction with a magnetically permeable tube 29. A
plurality of blades 26 are fastened with a rotor seat 27 which is
provided in the inner side with a magnetic ring rotor 28. The
magnetic ring rotor 28 is induced by the coil 23 of the stator 22
to drive the blades 26. The coil 23 is vulnerable to damage in the
course of mounting the upper polar piece 24 and the lower polar
piece 25, thereby resulting in high rejection rate of the
product.
[0007] These two prior art cooling fan structures share a common
limitation. The pole number and the phase number of the stators 12
and 22 cannot be easily increased. In addition, they have a dead
point problem, which prevents their operational stability from
being effectively enhanced.
BRIEF SUMMARY OF THE INVENTION
[0008] It is the primary objective of the present invention to
provide a cooling fan structure comprising a ring stator having a
coil and being mounted in the center of a base. The structure
further comprises a magnetic ring rotor which is mounted on an axis
of a blade rotor seat. As a result, the winding of the structure of
the present invention is simplified.
[0009] It is another objective of the present invention to provide
a cooling fan structure comprising a ring stator and a magnetic
ring rotor. The ring stator is mounted in the center of a base,
while the magnetic ring rotor is mounted on an axis of a blade
rotor seat. As a result, the pole number of the ring stator can be
easily increased to enhance the operating stability of the cooling
fan structure.
[0010] It is still another objective of the present invention to
provide a cooling fan structure comprising two sets of ring stators
and two sets of coil. The ring stator is provided with a plurality
of polar pieces, which are fastened with a ring seat along with an
insulation plastic material, so as to facilitate the winding of the
coil. As a result, the operational dead point of the structure of
this present invention is eliminated.
[0011] The features, functions, and advantages of the present
invention will be more readily understood upon a thoughtful
deliberation of the following detailed description of two preferred
embodiments of the present invention with reference to the
accompanying drawings.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0012] FIG. 1 shows an exploded view of a cooling fan structure of
the prior art.
[0013] FIG. 2 shows a top plan view of the prior art cooling fan
structure in combination.
[0014] FIG. 3 shows a sectional schematic view of the prior art
cooling fan structure in combination.
[0015] FIG. 4 shows an exploded view of another prior art cooling
fan structure.
[0016] FIG. 5 shows a top plan view of the another prior art
cooling fan structure in combination.
[0017] FIG. 6 shows a sectional schematic view of the another prior
art cooling fan structure in combination.
[0018] FIG. 7 shows a perspective view of a first preferred
embodiment of the present invention.
[0019] FIG. 8 shows an exploded view of the first preferred
embodiment of the present invention.
[0020] FIG. 9 shows a sectional schematic view of the first
preferred embodiment of the present invention in combination.
[0021] FIG. 10 show an exploded view of a second preferred
embodiment of the present invention.
[0022] FIG. 11 shows a sectional schematic view of the second
preferred embodiment of the present invention in combination.
DETAILED DESCRIPTION OF THE INVENTION
[0023] As shown in FIGS. 7-9, a cooling fan structure of the first
preferred embodiment of the present invention comprises a base 31,
a ring stator 32, a blade rotor seat 37, and a magnetic ring rotor
38.
[0024] The ring stator 32 is mounted in the center of the base 31
and is formed of a plurality of polar claws 34 and a coil 33. The
polar claws 34 are disposed in the inner side of the ring stator 32
and are integrally made of a plastic material with the ring stator
32. The coil 33 is wound around the outer side of the ring stator
32.
[0025] The blade rotor seat 37 is mounted in the base 31 such that
the blade rotor seat 37 circumvents the ring stator 32. The blade
rotor seat 37 is fastened with a plurality of blades 36.
[0026] The magnetic ring rotor 38 is disposed in a receiving space
of the ring stator 32 and is mounted on an axis 39. The magnetic
ring rotor 38 is induced by the coil 33 of the ring stator 32 to
drive the blades 36.
[0027] As shown in FIGS. 10 and 11, the ring stator 32 of the
second preferred embodiment of the present invention is formed of
two sets of polar claws 34 and two sets of coil 33, so as to
increase the pole number of the ring stator 32. As a result, the
operational stability of the cooling fan structure of the present
invention is enhanced. In light of alternate layout of the phase
number, the operational dead point of the present invention is
eliminated to enhance further the operational stability of the
present invention. The polar claws 34 are disposed in the inner
side of the ring stator 32, while the coils 33 are wound on the
outer side of the ring stator 32. As a result, the winding of the
present invention is simplified to reduce the rejection rate of the
product. In light of the structure of the present invention being
provided with a plural sets of the polar claws 34, the operational
stability of the present invention is further enhanced. In the
meantime, the dead point problem is eliminated.
[0028] The embodiments of the present invention described above are
to be regarded in all respects as being illustrative and
nonrestrictive. Accordingly, the present invention may be embodied
in other specific forms without deviating from the spirit thereof.
The present invention is therefore to be limited only by the scope
of the following claims.
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