U.S. patent application number 13/467221 was filed with the patent office on 2012-11-15 for heat-dissipation fan.
This patent application is currently assigned to ADDA CORP.. Invention is credited to Yu-Cheng Chen, Cheng-Chun Chou, Yen-Min Su.
Application Number | 20120288384 13/467221 |
Document ID | / |
Family ID | 47141998 |
Filed Date | 2012-11-15 |
United States Patent
Application |
20120288384 |
Kind Code |
A1 |
Chou; Cheng-Chun ; et
al. |
November 15, 2012 |
HEAT-DISSIPATION FAN
Abstract
A heat-dissipation fan includes a first plate, a second plate, a
ring wall, a spacing rib, a stator and a fan wheel. The first plate
comprises a vent, and an accommodating space can be defined by the
first plate, the second plate and the ring wall. The spacing rib is
disposed at the accommodating space. A passage is formed between
the spacing rib and the ring wall, and an end portion of the
spacing rib and the ring wall are spaced apart to form an opening.
The passage is in communication with the vent, and the opening is
in communication with the passage and the accommodating space. The
fan wheel can be driven by the stator, and the dust adhered to the
accommodating space may be discharged through the opening, the
passage and the vent via airflow generated by rotating fan
wheel.
Inventors: |
Chou; Cheng-Chun; (Pingtung
County, TW) ; Chen; Yu-Cheng; (Pingtung County,
TW) ; Su; Yen-Min; (Pingtung County, TW) |
Assignee: |
ADDA CORP.
Pingtung County
TW
|
Family ID: |
47141998 |
Appl. No.: |
13/467221 |
Filed: |
May 9, 2012 |
Current U.S.
Class: |
417/410.1 |
Current CPC
Class: |
F04D 27/004 20130101;
F04D 17/162 20130101; F04D 25/0633 20130101; F04D 29/703
20130101 |
Class at
Publication: |
417/410.1 |
International
Class: |
F04B 35/04 20060101
F04B035/04 |
Foreign Application Data
Date |
Code |
Application Number |
May 12, 2011 |
TW |
100116616 |
Claims
1. A heat-dissipation fan comprising: a first plate having a first
top surface, a first bottom surface, a first aperture and a vent; a
second plate having a second top surface, a second bottom surface
and a second aperture; a ring wall having an inner surface, an
outer surface and a first opening, wherein the ring wall is
disposed between the first plate and the second plate, and an
accommodating space can be defined by the first plate, the second
plate and the ring wall; a spacing rib disposed at the
accommodating space, wherein a passage is formed between the ring
wall and the spacing rib, the spacing rib comprises a first end
portion and a second end portion, the second end portion and the
ring wall are spaced apart to form a second opening, the passage is
in communication with the vent, and the second opening is in
communication with the passage and the accommodating space; a
stator disposed at the accommodating space; a circuit board having
a forward/reverse control unit, wherein the circuit board is
electrically connected with the stator; and a fan wheel coupled to
the stator, wherein the fan wheel comprises a hub and a plurality
of blades, the rotation direction of the fan wheel is controllable
by the forward/reverse control unit.
2. The heat-dissipation fan in accordance with claim 1, wherein the
first end portion of the spacing rib is in contact with the inner
surface of the ring wall.
3. The heat-dissipation fan in accordance with claim 2, wherein the
first end portion of the spacing rib is formed as one piece with
the inner surface.
4. The heat-dissipation fan in accordance with claim 1, wherein the
first end portion of the spacing rib and the inner surface of the
ring wall are spaced apart by a first spacing, the second end
portion of the spacing rib and the inner surface of the ring wall
are spaced apart by a second spacing, and the second spacing is
larger than the first spacing.
5. The heat-dissipation fan in accordance with claim 4, wherein the
first spacing has a first width, the second spacing has a second
width, and the passage between the spacing rib and the inner
surface of the ring wall is tapered from the second width to the
first width.
6. The heat-dissipation fan in accordance with claim 5, wherein the
spacing rib can be an arc-shaped plate.
7. The heat-dissipation fan in accordance with claim 2, wherein the
spacing rib is formed as one piece with the first top surface of
the first plate.
8. The heat-dissipation fan in accordance with claim 2, wherein the
spacing rib is formed as one piece with the second bottom surface
of the second plate.
9. The heat-dissipation fan in accordance with claim 2 further
includes an active spacing rib disposed at the second opening.
10. The heat-dissipation fan in accordance with claim 9, wherein
the active spacing rib comprises a pivoted portion and a swing
portion in connection with the pivoted portion, the pivoted portion
is pivotally connected with the first top surface of the first
plate.
11. The heat-dissipation fan in accordance with claim 10, wherein
the pivoted portion is pivotally connected with the second bottom
surface of the second plate.
12. The heat-dissipation fan in accordance with claim 9 further
includes a pillar disposed between the active spacing rib and the
blades of the fan wheel.
13. The heat-dissipation fan in accordance with claim 12, wherein
the pillar is formed as one piece with the first top surface of the
first plate.
14. The heat-dissipation fan in accordance with claim 12, wherein
the pillar is formed as one piece with the second bottom surface of
the second plate.
15. The heat-dissipation fan in accordance with claim 9 further
includes a resilient member, wherein the resilient member comprises
a first end and a second end, the first end is fixed at the spacing
rib, and the second end is fixed at the active spacing rib.
16. A heat-dissipation fan comprising: a first plate having a first
top surface and a first bottom surface; a second plate having a
second top surface and a second bottom surface; a ring wall having
an inner surface, an outer surface and a first opening, wherein the
ring wall is disposed between the first plate and the second plate,
and an accommodating space can be defined by the first plate, the
second plate and the ring wall; a spacing rib disposed at the
accommodating space, wherein a passage is formed between the ring
wall and the spacing rib, the spacing rib comprises a first end
portion and a second end portion, the second end portion and the
ring wall are spaced apart to form a second opening, the passage
comprises a vent in communication with an edge of the first plate,
the second opening is in communication with the passage and the
accommodating space; a stator disposed at the accommodating space;
a circuit board having a forward/reverse control unit, wherein the
circuit board is electrically connected with the stator; and a fan
wheel coupled to the stator, wherein the fan wheel comprises a hub
and a plurality of blades, the rotation direction of the fan wheel
is controllable by the forward/reverse control unit.
17. The heat-dissipation fan in accordance with claim 16, wherein
the first end portion of the spacing rib is in contact with the
inner surface of the ring wall.
18. The heat-dissipation fan in accordance with claim 17, wherein
the first end portion of the spacing rib is formed as one piece
with the inner surface.
19. The heat-dissipation fan in accordance with claim 16, wherein
the first end portion of the spacing rib and the inner surface of
the ring wall are spaced apart by a first spacing, the second end
portion of the spacing rib and the inner surface of the ring wall
are spaced apart by a second spacing, and the second spacing is
larger than the first spacing.
20. The heat-dissipation fan in accordance with claim 19, wherein
the first spacing has a first width, the second spacing has a
second width, and the passage between the spacing rib and the inner
surface of the ring wall is tapered from the second width to the
first width.
21. The heat-dissipation fan in accordance with claim 17 further
includes an active spacing rib disposed at the second opening, and
the active spacing rib comprises a pivoted portion and a swing
portion in connection with the pivoted portion.
22. A heat-dissipation fan comprising: a plate having a top
surface, a bottom surface and a vent; a ring wall having an inner
surface, an outer surface and a first opening, wherein the ring
wall is disposed at the plate, and an accommodating space can be
defined by the plate and the ring wall; a spacing rib disposed at
the accommodating space, wherein a passage is formed between the
ring wall and the spacing rib, the spacing rib comprises a first
end portion and a second end portion, the second end portion and
the ring wall are spaced apart to form a second opening, the
passage is in communication with the vent, the second opening is in
communication with the passage and the accommodating space; a
stator disposed at the accommodating space; a circuit board
electrically connected with the stator; and a fan wheel coupled to
the stator, wherein the fan wheel comprises a hub and a plurality
of blades, the rotation direction of the fan wheel is controllable
by the circuit board.
23. The heat-dissipation fan in accordance with claim 22, wherein
the first end portion of the spacing rib is in contact with the
inner surface of the ring wall.
24. The heat-dissipation fan in accordance with claim 23, wherein
the first end portion of the spacing rib is formed as one piece
with the inner surface.
25. The heat-dissipation fan in accordance with claim 22, wherein
the first end portion of the spacing rib and the inner surface of
the ring wall are spaced apart by a first spacing, the second end
portion of the spacing rib and the inner surface of the ring wall
are spaced apart by a second spacing, and the second spacing is
larger than the first spacing.
26. The heat-dissipation fan in accordance with claim 25, wherein
the first spacing has a first width, the second spacing has a
second width, and the passage between the spacing rib and the inner
surface of the ring wall is tapered from the second width to the
first width.
27. The heat-dissipation fan in accordance with claim 26, wherein
the spacing rib can be an arc-shaped plate.
28. The heat-dissipation fan in accordance with claim 23, wherein
the spacing rib is formed as one piece with the first top surface
of the first plate.
29. The heat-dissipation fan in accordance with claim 23, wherein
the spacing rib is formed as one piece with the second bottom
surface of the second plate.
Description
FIELD OF THE INVENTION
[0001] The present invention is generally related to a
heat-dissipation fan, which particularly relates to the
heat-dissipation fan with dust exhaustion function.
BACKGROUND OF THE INVENTION
[0002] A conventional heat-dissipation fan 10 as indicated in FIGS.
19 and 20 includes a bottom plate 11, a ring wall 12, a stator 13,
a circuit board 14, a fan wheel 15 and a lid 16. The bottom plate
11 comprises a first vent 11a, the ring wall 12 comprises a second
vent 12a, and the ring wall 12 is disposed at the bottom plate 11
so as to define an accommodating slot 17. The stator 13, the
circuit board 14 and the fan wheel 15 are disposed within the
accommodating slot 17, wherein the circuit board 14 is electrically
connected with the stator 13 to drive the fan wheel 15 into
rotation counterclockwise. The lid 16 is coupled to the ring wall
12 and comprises a third vent 16a. When the fan wheel 15 rotates
counterclockwise, the air outside the heat-dissipation fan 10 is
exhausted into the accommodating slot 17 through the first vent 11
a and the third vent 16a, and the air is eventually discharged from
the second vent 12a. However, for the reason that the dust is
adhered to the fan wheel 15, the stator 13, the circuit board 14,
an inner surface of the ring wall 12, a peripheral of the first
vent 11a and a peripheral of the third vent 16a, long-term
accumulated dusts may lower the rotation speed of the fan wheel 15
therefore lowering effectiveness of heat dissipation. Or, the
heat-dissipation fan 10 fails to operate normally.
SUMMARY
[0003] A rotating fan wheel of a conventional heat-dissipation fan
may gather the dust within the conventional heat-dissipation fan to
lead a slower rotation speed of the fan wheel or a destruction of
the heat-dissipation fan. The primary object of the present
invention is to overcome mentioned issue of the conventional
heat-dissipation fan. A heat-dissipation fan in this invention
includes a first plate, a second plate, a ring wall, a spacing rib,
a stator, a circuit board and a fan wheel. The first plate
comprises a first top surface, a first bottom surface, a first
aperture and a vent, and a second plate comprises a second top
surface, a second bottom surface and a second aperture. The ring
wall comprises an inner surface, an outer surface and a first
opening, wherein the ring wall is disposed between the first plate
and the second plate, and an accommodating space can be defined by
the first plate, the second plate and the ring wall. The spacing
rib is disposed at the accommodating space. A passage is formed
between the spacing rib and the ring wall, the spacing rib
comprises a first end portion and a second end portion, wherein the
second end portion and the ring wall are spaced apart to form a
second opening. The passage is in communication with the vent, and
the second opening is in communication with the passage and the
accommodating space. The stator is disposed at the accommodating
space. The circuit board is electrically connected with the stator
and includes a forward/reverse control unit. The fan wheel is
coupled to the stator and comprises a hub and a plurality of
blades. The rotation direction of the fan wheel is controllable by
the forward/reverse control unit. When the fan wheel is rotated in
a certain direction, the air inside the accommodating space may be
discharged through the second opening, the passage and the vent,
which may push forward the dust that is adhered to the
accommodating space to be discharged. Therefore, the cleaning of
the heat-dissipation fan and dust exhaustion can be achieved
simultaneously.
[0004] Besides, the first end portion of the spacing rib and the
inner surface of the ring wall are spaced apart by a first spacing,
the second end portion of the spacing rib and the inner surface of
the ring wall are spaced apart by a second spacing, the first
spacing has a first width, the second spacing has a second width,
and the passage between the spacing rib and the inner surface of
the ring wall is tapered from the second width to the first width
so that the passage can be regarded as a pressure accumulation
passage. When the air inside the accommodating space passes through
the second opening and the passage, a pressure difference is
generated for increasing the pressure of the air that is penetrated
through the vent. A relative large air pressure may prevent the
dust from gathering around the vent, and an obstruction of the vent
can be avoidable.
DESCRIPTION OF THE DRAWINGS
[0005] FIG. 1 is a perspective exploded diagram illustrating a
heat-dissipation fan in accordance with a first embodiment of the
present invention.
[0006] FIG. 2 is a partial assembly diagram illustrating a
heat-dissipation fan in accordance with a first embodiment of the
present invention.
[0007] FIG. 3 is an action diagram illustrating a heat-dissipation
fan in accordance with a first embodiment of the present
invention.
[0008] FIG. 4 is an action diagram illustrating a heat-dissipation
fan in accordance with a first embodiment of the present
invention.
[0009] FIG. 5 is a perspective exploded diagram illustrating a
heat-dissipation fan in accordance with a second embodiment of the
present invention.
[0010] FIG. 6 is a partial assembly diagram illustrating a
heat-dissipation fan in accordance with a second embodiment of the
present invention.
[0011] FIG. 7 is a perspective exploded diagram illustrating a
heat-dissipation fan in accordance with a third embodiment of the
present invention.
[0012] FIG. 8 is a partial assembly diagram illustrating a
heat-dissipation fan in accordance with a third embodiment of the
present invention.
[0013] FIG. 9 is an action diagram illustrating a heat-dissipation
fan in accordance with a third embodiment of the present
invention.
[0014] FIG. 10 is a perspective exploded diagram illustrating a
heat-dissipation fan in accordance with a fourth embodiment of the
present invention.
[0015] FIG. 11 is a partial assembly diagram illustrating a
heat-dissipation fan in accordance with a fourth embodiment of the
present invention.
[0016] FIG. 12 is an action diagram illustrating a heat-dissipation
fan in accordance with a fourth embodiment of the present
invention.
[0017] FIG. 13 is a perspective exploded diagram illustrating a
heat-dissipation fan in accordance with a fifth embodiment of the
present invention.
[0018] FIG. 14 is a partial assembly diagram illustrating a
heat-dissipation fan in accordance with a fifth embodiment of the
present invention.
[0019] FIG. 15 is an action diagram illustrating a heat-dissipation
fan in accordance with a fifth embodiment of the present
invention.
[0020] FIG. 16 is an action diagram illustrating a heat-dissipation
fan in accordance with a fifth embodiment of the present
invention.
[0021] FIG. 17 is a perspective exploded diagram illustrating a
heat-dissipation fan in accordance with a sixth embodiment of the
present invention.
[0022] FIG. 18 is an action diagram illustrating a heat-dissipation
fan in accordance with a sixth embodiment of the present
invention.
[0023] FIG. 19 is a perspective exploded diagram of a conventional
heat-dissipation fan.
[0024] FIG. 20 is a perspective assembly diagram of a conventional
heat-dissipation fan.
DETAILED DESCRIPTION OF THE INVENTION
[0025] With reference to FIGS. 1, 2, 3 and 4, a heat-dissipation
fan 100 in accordance with a first preferred embodiment of the
present invention includes a first plate 110, a second plate 120, a
ring wall 130, a spacing rib 150, a stator 170, a circuit board 180
and a fan wheel 190. The first plate 110 comprises a first top
surface 111, a first bottom surface 112, a first aperture 113 and a
vent 114, wherein the first aperture 113 and the vent 114 are
penetrated through the first top surface 111 and the first bottom
surface 112. Referring to FIG. 1, in this embodiment, the first
plate 110 further comprises a supporting base 115 disposed at the
first aperture 113. The second plate 120 comprises a second top
surface 121, a second bottom surface 122, and a second aperture 123
penetrated through the second top surface 121 and the second bottom
surface 122. The ring wall 130 comprises an inner surface 131, an
outer surface 132 and a first opening 133. With reference to FIG.
2, the ring wall 130 is coupled to the first top surface 111 of the
first plate 110, and the ring wall 130 is disposed between the
first plate 110 and the second plate 120. The second bottom surface
122 of the second plate 120 is coupled to the ring wall 130 and
faces toward the first top surface 111 of the first plate 110,
wherein an accommodating space 140 can be defined by the first
plate 110, the second plate 120 and the ring wall 130. The spacing
rib 150 is located between the first plate 110 and the second plate
120 and is disposed at the accommodating space 140. In this
embodiment, a passage 160 is formed between the spacing rib 150 and
the ring wall 130. The spacing rib 150 comprises a first end
portion 151 and a second end portion 152, wherein the second end
portion 152 and the ring wall 130 are spaced apart to form a second
opening 161. The passage 160 is in communication with the vent 114,
and the second opening 161 is in communication with the passage 160
and the accommodating space 140. The first end portion 151 of the
spacing rib 150 is in contact against the inner surface 131 of the
ring wall 130. In this embodiment, the first end portion 151 of the
spacing rib 150 is formed as one piece with the inner surface 131
of the ring wall 130. With reference to FIGS. 1 and 3, the first
end portion 151 of the spacing rib 150 and the inner surface 131 of
the ring wall 130 are spaced apart by a first spacing 162, the
second end portion 152 of the spacing rib 150 and the inner surface
131 of the ring wall 130 are spaced apart by a second spacing 163,
in this embodiment, the second spacing 163 is larger than the first
spacing 162. The first spacing 162 has a first width, and the
second spacing 163 has a second width. The passage 160 between the
spacing rib 150 and the inner surface 131 of the ring wall 130 is
tapered from the second width to the first width so that the
passage 160 can be regarded as a pressure accumulation passage. The
spacing rib 150 can be an arc-shaped plate. The stator 170 is
disposed at the accommodating space 140, and the stator 170 is
located between the first plate 110 and the second plate 120.
Besides, the stator 170 and the circuit board 180 are coupled to
the supporting base 115 of the first plate 110, wherein the circuit
board 180 includes a forward/reverse control unit 181, and the
forward/reverse control unit 181 can be a micro controller unit or
an analog circuit. The forward/reverse control unit 181 is
electrically connected with the circuit board 180, and the circuit
board 180 is electrically connected with the stator 170. The fan
wheel 190 is coupled to the stator 170 and can be driven to rotate
by the stator 170. The fan wheel 190 comprises a hub 191 and a
plurality of blades 192. The rotation direction of the fan wheel
190 is controllable by the forward/reverse control unit 181.
Therefore, the fan wheel 190 can be driven to rotate in a first
direction or in a second direction opposite to the first direction,
wherein the first direction can be clockwise or counterclockwise.
In this embodiment, the first direction is clockwise, and the
second direction is counterclockwise.
[0026] With reference to FIGS. 1, 2 and 3, when the fan wheel 190
is rotated in the second direction controlled by the
forward/reverse control unit 181, the rotating blades 192 of the
fan wheel 190 enable the air inside the accommodating space 140 to
generate airflow A1. The air outside the heat-dissipation fan 100
may pass through the first aperture 113 of the first plate 110 and
the second aperture 123 of the second plate 120, and the air is
eventually exhausted into the accommodating space 140 via airflow
A1. In the mean time, the air inside the accommodating space 140
may be discharged from the first opening 133 of the ring wall 130
via airflow A1 therefore forming a gas circulation to achieve heat
dissipation function.
[0027] With reference to FIGS. 1, 2 and 4, when the fan wheel 190
is rotated in the first direction controlled by the forward/reverse
control unit 181, the rotating blades 192 of the fan wheel 190
enable the air within the accommodating space 140 to generate
airflow A2. The air outside the heat-dissipation fan 100 may pass
through the first opening 133 of the ring wall 130 and is exhausted
into the accommodating space 140 via airflow A2. In the mean time,
the air inside the accommodating space 140 may be discharged
through the second opening 161, the passage 160 and the vent 114
via airflow A2, which may push forward the dust adhered to the
accommodating space 140 to be discharged from the vent 114 of the
heat-dissipation fan 100 as well. Accordingly, the cleaning of the
heat-dissipation fan 100 and dust exhaustion can be achieved
simultaneously.
[0028] With reference to FIG. 4 again, for the reason that the
passage 160 between the spacing rib 150 and the inner surface 131
of the ring wall 130 is tapered from the second width to the first
width so that the passage 160 can be regarded as a pressure
accumulation passage. Under the same airflow pressure, when the air
within the accommodating space 140 passes through the second
opening 161 and the passage 160, a pressure difference is generated
for increasing the pressure of the air that is penetrated through
the vent 114. A relative large air pressure may prevent the dust
from gathering around the vent 114, and an obstruction of the vent
114 can be avoidable. It is beneficial for exhausting the dust of
the heat-dissipation fan 100.
[0029] A second embodiment of this invention can be referred to
FIGS. 5 and 6. The difference between the second embodiment and the
first embodiment is that a vent 124 is disposed at the second plate
120, and the vent 124 is penetrated through the second top surface
121 and the second bottom surface 122. When the fan wheel 190 is
rotated in the first direction controlled by the forward/reverse
control unit 181, the dust within the accommodating space 140 may
be discharged through the second opening 161, the passage 160 and
the vent 124. Accordingly, the cleaning of the heat-dissipation fan
100 and dust exhaustion can be achieved simultaneously.
[0030] A third embodiment of this invention can be referred to
FIGS. 7-9, the difference between the third embodiment and the
first embodiment is that the spacing rib 150 is formed as one piece
with the first top surface 111 of the first plate 110. Referring to
FIGS. 7, 8 and 9 again, the ring wall 130 is coupled to the first
top surface 111 of the first plate 110, the second plate 120 is
coupled to the ring wall 130, and the passage 160 is formed between
the spacing rib 150 and the ring wall 130. In this embodiment, the
first end portion 151 of the spacing rib 150 is in contact against
the inner surface 131 of the ring wall 130. With reference to FIG.
9, when the fan wheel 190 is rotated in the first direction
controlled by the forward/reverse control unit 181, the air inside
the accommodating space 140 may be discharged through the second
opening 161, the passage 160 and the vent 114 via airflow A2, which
may push forward the dust adhered to the accommodating space 140 to
be discharged from the heat-dissipation fan 100 as well.
Accordingly, the cleaning of the heat-dissipation fan 100 and dust
exhaustion can be achieved simultaneously.
[0031] A fourth embodiment of this invention can be referred to
FIGS. 10, 11 and 12. The difference between the fourth embodiment
and the first embodiment is that the spacing rib 150 is formed as
one piece with the second bottom surface 122 of the second plate
120. Referring to FIGS. 10, 11 and 12 again, the ring wall 130 is
coupled to the second bottom surface 122 of the second plate 120,
and the passage 160 is formed between the spacing rib 150 and the
ring wall 130. In this embodiment, the first end portion 151 of the
spacing rib 150 is in contact against the inner surface 131 of the
ring wall 130, and the second end portion 152 and the ring wall 130
are spaced apart to form the second opening 161. The passage 160 is
in communication with the vent 114 of the first plate 110. With
reference to FIG. 12, when the fan wheel 190 is rotated in the
first direction controlled by the forward/reverse control unit 181,
the air inside the accommodating space 140 may be discharged
through the second opening 161, the passage 160 and the vent 114
via airflow A2, which may push forward the dust adhered to the
accommodating space 140 to be discharged from the heat-dissipation
fan 100 as well. Accordingly, the cleaning of the heat-dissipation
fan 100 and dust exhaustion can be achieved simultaneously.
[0032] A fifth embodiment of this invention can be referred to
FIGS. 13-16. The difference between the fifth embodiment and the
first embodiment is that the heat-dissipation fan 100 further
includes an active spacing rib 150a disposed at the second opening
161. Referring to FIGS. 13 and 14, the active spacing rib 150a
comprises a pivoted portion 150b and a swing portion 150c in
connection with the pivoted portion 150b. In this embodiment, the
pivoted portion 150b is pivotally connected with the first top
surface 111 of the first plate 110 and the second bottom surface
122 of the second plate 120. The ring wall 130 is coupled to the
first top surface 111 of the first plate 110, the second plate 120
is coupled to the ring wall 130, the pivoted portion 150b is
adjacent to the second end portion 152 of the spacing rib 150, and
the swing portion 150c is swingable in the accommodating space 140.
In this embodiment, the heat-dissipation fan 100 further includes a
resilient member S having a first end S1 and a second end S2,
wherein the resilient member S can be chosen from a leaf spring or
a conventional spring. With reference to FIGS. 13, 14, 15 and 16,
in this embodiment, the resilient member S can be a leaf spring,
the first end S1 of the resilient member S is fixed at the spacing
rib 150, and the second end S2 is fixed at the active spacing rib
150a. Preferably, the heat-dissipation fan 100 further includes a
pillar P disposed between the active spacing rib 150a and the
blades 192 of the fan wheel 190. In this embodiment, the pillar P
is formed as one piece with the first top surface 111 of the first
plate 110. Or, in another embodiment, the pillar P is formed as one
piece with the second bottom surface 122 of the second plate
120.
[0033] Referring to FIGS. 13, 14 and 15 again, in this embodiment,
when the fan wheel 190 is rotated in the second direction
controlled by the forward/reverse control unit 181, the rotating
blades 192 of the fan wheel 190 enable the air within the
accommodating space 140 to generate airflow A1. The swing portion
150c is to utilize the pivoted portion 150b as a rotation axis and
can be driven by airflow A1 so as to swing toward the inner surface
131 of the ring wall 130. The second opening 161 can be sealed by
the swing portion 150c to prevent the air outside the
heat-dissipation fan 100 from exhausting through the vent 114, the
passage 160 and the second opening 161 to the accommodating space
140 to avoid a dust obstruction in the vent 114 of the
heat-dissipation fan 100.
[0034] With reference to FIGS. 13, 14 and 16 again, when the fan
wheel 190 is rotated in the first direction controlled by the
forward/reverse control unit 181, the first end S1 of the resilient
member S is fixed at the spacing rib 150, and the second end S2 is
fixed at the active spacing rib 150a. Therefore, the resilient
member S provides an elastic force to enable the swing portion 150c
to utilize the pivoted portion 150b as a rotation axis and swings
toward the fan wheel 190, and the swing portion 150c is in contact
against the pillar P to prevent the swing portion 150c of the
active spacing rib 150 from colliding with the blades 192 of the
fan wheel 190 to avoid a destruction of the heat-dissipation fan
100. Referring to FIG. 16, when the swing portion 150c swings
toward the fan wheel 190, the passage 160 communicates with the
accommodating space 140. The air inside the accommodating space 140
may be discharged through the second opening 161, the passage 160
and the vent 114 via airflow A2, which may push forward the dust
adhered to the accommodating space 140 to be discharged from the
heat-dissipation fan 100.
[0035] A sixth embodiment of this invention can be referred to
FIGS. 17 and 18. The difference between the sixth embodiment and
the first embodiment is that a vent is not disposed at the first
plate 110. When the spacing rib 150 is disposed at the
accommodating space 140, the passage 160 formed between the spacing
rib 150 and the ring wall 130 is in communication with an edge 116
of the first plate 110. Referring to FIG. 16, in this embodiment,
the passage 160 comprises a vent 164 in communication with the edge
116 of the first plate 110. When the fan wheel 190 is rotated in
the first direction controlled by the forward/reverse control unit
181, the air inside the accommodating space 140 may be discharged
through the second opening 161, the passage 160 and the vent 164 of
the passage 160 via airflow A2, which may push forward the dust
adhered to the accommodating space 140 to be discharged from the
heat-dissipation fan 100 as well. Accordingly, the cleaning of the
heat-dissipation fan 100 and dust exhaustion can be achieved
simultaneously.
[0036] In each embodiment, when the fan wheel 190 is rotated in the
second direction, the air outside the heat-dissipation fan 100 may
be exhausted through the first aperture 113 of the first plate 110
and the second aperture 123 of the second plate 120. In the mean
time, the air inside the accommodating space 140 may be discharged
from the first opening 133 of the ring wall 130 therefore forming a
gas circulation for achieving heat dissipation function.
Oppositely, when the fan wheel 190 is rotated in the first
direction, the air inside the accommodating space 140 may be
discharged through the second opening 161, the passage 160 and the
vent 114, 124, 164. By discharging the air inside the accommodating
space 140, the dust adhered to the accommodating space 140 can be
discharged from the heat-dissipation fan 100 as well. Accordingly,
the cleaning of the heat-dissipation fan 100 and dust exhaustion
can be achieved simultaneously.
[0037] While this invention has been particularly illustrated and
described in detail with respect to the preferred embodiments
thereof, it will be clearly understood by those skilled in the art
that it is not limited to the specific features and describes and
various modifications and changes in form and details may be made
without departing from the spirit and scope of this invention.
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