U.S. patent application number 17/216684 was filed with the patent office on 2021-10-14 for centrifugal heat dissipation fan and heat dissipation system of electronic device.
This patent application is currently assigned to Acer Incorporated. The applicant listed for this patent is Acer Incorporated. Invention is credited to Sheng-Yan Chen, Tsung-Ting Chen, Wei-Chin Chen, Cheng-Wen Hsieh, Wen-Neng Liao, Kuang-Hua Lin, Yu-Ming Lin.
Application Number | 20210321533 17/216684 |
Document ID | / |
Family ID | 1000005503808 |
Filed Date | 2021-10-14 |
United States Patent
Application |
20210321533 |
Kind Code |
A1 |
Chen; Tsung-Ting ; et
al. |
October 14, 2021 |
CENTRIFUGAL HEAT DISSIPATION FAN AND HEAT DISSIPATION SYSTEM OF
ELECTRONIC DEVICE
Abstract
A centrifugal heat dissipation fan including a housing and an
impeller is provided. The housing has at least one inlet disposed
along an axis and at least one first outlet and a second outlet
located in different radial directions, wherein the first outlet
and the second outlet are opposite to and separated from each
other. The impeller is disposed in the housing along the axis. A
heat dissipation system of an electronic device is also
provided.
Inventors: |
Chen; Tsung-Ting; (New
Taipei City, TW) ; Liao; Wen-Neng; (New Taipei City,
TW) ; Hsieh; Cheng-Wen; (New Taipei City, TW)
; Lin; Yu-Ming; (New Taipei City, TW) ; Chen;
Wei-Chin; (New Taipei City, TW) ; Lin; Kuang-Hua;
(New Taipei City, TW) ; Chen; Sheng-Yan; (New
Taipei City, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Acer Incorporated |
New Taipei City |
|
TW |
|
|
Assignee: |
Acer Incorporated
New Taipei City
TW
|
Family ID: |
1000005503808 |
Appl. No.: |
17/216684 |
Filed: |
March 30, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H05K 7/20154 20130101;
H05K 7/20172 20130101; H05K 7/20145 20130101 |
International
Class: |
H05K 7/20 20060101
H05K007/20 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 10, 2020 |
TW |
109112202 |
Claims
1. A centrifugal heat dissipation fan, comprising: a housing,
having at least one inlet disposed along an axis and at least one
first outlet and a second outlet located in different radial
directions, wherein the first outlet and the second outlet are
opposite to and separated from each other; and an impeller,
disposed in the housing along the axis.
2. The centrifugal heat dissipation fan according to claim 1,
wherein the impeller and the housing form at least one divergent
channel, the first outlet is located at a middle section of the
divergent channel, and the second outlet is located at an end of
the divergent channel.
3. The centrifugal heat dissipation fan according to claim 2,
wherein an inner wall of the housing has a tongue end, located at a
starting point of the divergent channel, the tongue end is adjacent
to the second outlet, and a diverging direction of the divergent
channel is the same as a rotational direction of the impeller.
4. The centrifugal heat dissipation fan according to claim 1,
wherein the impeller and the housing form a first channel and a
second channel, the first channel, the first outlet, the second
channel, and the second outlet are cyclically and adjacently
connected to one other in sequence.
5. The centrifugal heat dissipation fan according to claim 4,
wherein a channel width of the first channel is less than a channel
width of the second channel.
6. The centrifugal heat dissipation fan according to claim 1,
wherein there is a non-90-degree included angle between an air
output radial direction of the first outlet and an air output
radial direction of the second outlet.
7. The centrifugal heat dissipation fan according to claim 1,
wherein the second outlet is a planar outlet.
8. The centrifugal heat dissipation fan according to claim 1,
wherein a radial direction range of the first outlet has a central
angle of 200 degrees relative to the axis.
9. The centrifugal heat dissipation fan according to claim 1,
wherein the housing has a reference radial direction relative to
the axis and parallel to a plane where the second outlet is
located, and based on the reference radial direction and along a
rotational direction of the impeller, a starting point of the first
outlet is located at a position with a central angle of -20 degrees
relative to the reference radial direction and an end point of the
first outlet is located at a position with a central angle of 180
degrees relative to the reference radial direction.
10. The centrifugal heat dissipation fan according to claim 1,
wherein an air output of the second outlet is greater than an air
output of the first outlet.
11. The centrifugal heat dissipation fan according to claim 1,
wherein an orthographic projection size of the first outlet on the
axis is smaller than an orthographic projection size of the housing
on the axis.
12. The centrifugal heat dissipation fan according to claim 1,
wherein the housing has a plurality of first outlets located in
different radial directions.
13. The centrifugal heat dissipation fan according to claim 1,
wherein the housing further has at least one guiding structure,
located at the first outlet and extending away from the axis.
14. A heat dissipation system of an electronic device, comprising:
a body; a plurality of heat sources, disposed in the body; and at
least one centrifugal heat dissipation fan, disposed in the body,
the centrifugal heat dissipation fan comprising: a housing, having
at least one inlet disposed along an axis and at least one first
outlet and a second outlet located in different radial directions,
wherein the first outlet and the second outlet are opposite to and
separated from each other, and the first outlet and the second
outlet respectively correspond to the plurality of heat sources;
and an impeller, disposed in the housing along the axis.
15. The heat dissipation system of an electronic device according
to claim 14, the plurality of heat sources comprises at least one
electronic chip, the heat dissipation system of the electronic
device further comprises a heat conduction element and a heat
dissipation fin, the electronic chip conducts heat to the heat
dissipation fin via the heat conduction element, the first outlet
corresponds to the electronic chip, and the second outlet
corresponds to the heat dissipation fin.
16. The heat dissipation system of an electronic device according
to claim 14, wherein the plurality of heat sources comprises an
electronic chip corresponding to the first outlet and another
electronic chip corresponding to the second outlet, the heat
dissipation system of the electronic device further comprises a
heat conduction element, a heat dissipation fin, another heat
conduction element, and another heat dissipation fin, the
electronic chip conducts heat to the heat dissipation fin via the
heat conduction element, and the another electronic chip conducts
heat to the another heat dissipation fin via the another heat
conduction element.
17. The heat dissipation system of an electronic device according
to claim 14, wherein the impeller and the housing form at least one
divergent channel, the first outlet is located at a middle section
of the divergent channel, and the second outlet is located at an
end of the divergent channel.
18. The heat dissipation system of an electronic device according
to claim 17, wherein an inner wall of the housing has a tongue end,
located at a starting point of the divergent channel, the tongue
end is adjacent to the second outlet, and a diverging direction of
the divergent channel is the same as a rotational direction of the
impeller.
19. The heat dissipation system of an electronic device according
to claim 14, wherein the impeller and the housing form a first
channel and a second channel, the first channel, the first outlet,
the second channel, and the second outlet are cyclically and
adjacently connected to one another in sequence, and a channel
width of the first channel is less than a channel width of the
second channel.
20. The heat dissipation system of an electronic device according
to claim 14, wherein the second outlet is a planar outlet, a radial
direction range of the first outlet has a central angle of 200
degrees relative to the axis, and there is a non-90-degree included
angle between an air output radial direction of the first outlet
and an air output radial direction of the second outlet.
21. The heat dissipation system of an electronic device according
to claim 14, wherein the housing has a reference radial direction
relative to the axis and parallel to a plane where the second
outlet is located, and based on the reference radial direction and
along a rotational direction of the impeller, a starting point of
the first outlet is located at a position with a central angle of
-20 degrees relative to the reference radial direction and an end
point of the first outlet is located at a position with a central
angle of 180 degrees relative to the reference radial
direction.
22. The heat dissipation system of an electronic device according
to claim 14, wherein an air output of the second outlet is greater
than an air output of the first outlet.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the priority benefit of Taiwan
application serial no. 109112202, filed on Apr. 10, 2020. The
entirety of the above-mentioned patent application is hereby
incorporated by reference herein and made a part of this
specification.
BACKGROUND
Technical Field
[0002] The disclosure relates to a heat dissipation fan and a heat
dissipation system, and in particular to a centrifugal heat
dissipation fan and a heat dissipation system of an electronic
device.
Description of Related Art
[0003] Generally speaking, in order to improve the heat dissipation
effect in a notebook computer, the heat resistance of the system
may be reduced or the performance of the internal heat dissipation
fan may be improved. However, since notebook computers are trending
toward lighter and thinner appearances without too many heat
dissipation holes, the heat resistance of the system is relatively
high, thereby reducing the air intake of the heat dissipation fan,
so that air from the external environment does not readily enter
the system to generate the heat convection required for heat
dissipation.
[0004] At the same time, the air gap between the blades of the
conventional centrifugal fan is relatively large, so the air flow
may not be easily controlled and backflow may readily occur, so
that the wind pressure is insufficient, thereby affecting the heat
dissipation efficiency. Moreover, when the inlet is enlarged to
increase the air intake, if the fan blades do not provide a
corresponding structure, situations such as air leakage may readily
occur.
[0005] In addition, since electronic devices (such as notebook
computer or tablet computer) are gradually trending toward lighter
and thinner designs, in the case of extremely limited internal
space, the heat dissipation fan installed therein is also required
to be thinner as the goal. As a result, under the condition of
limited space, the air flow of the heat dissipation fan cannot
smoothly enter and exit the heat dissipation fan, thereby affecting
the heat dissipation efficiency thereof.
[0006] Based on the above, in the case where the heat resistance of
the conventional system is present, the above issue can be
effectively solved by providing effective means for increasing the
wind pressure and air volume of the heat dissipation fan.
SUMMARY
[0007] The disclosure provides a centrifugal heat dissipation fan
and a heat dissipation system of an electronic device, wherein the
centrifugal heat dissipation fan has two outlets located in
different radial directions and opposite to each other, so as to
satisfy both heat dissipation performance and system
configuration.
[0008] The centrifugal heat dissipation fan of the disclosure
includes a housing and an impeller. The housing has at least one
inlet disposed along an axis and at least one first outlet and a
second outlet located in different radial directions, wherein the
first outlet and the second outlet are opposite to and separated
from each other. The impeller is disposed in the housing along the
axis.
[0009] The heat dissipation system of the electronic device
according to the disclosure includes a body, multiple heat sources
disposed in the body, and at least one centrifugal heat dissipation
fan. The centrifugal heat dissipation fan includes a housing and an
impeller. The housing has at least one inlet disposed along an axis
and at least one first outlet and a second outlet located in
different radial directions, wherein the first outlet and the
second outlet are opposite to and separated from each other. The
impeller is disposed in the housing along the axis.
[0010] Based on the above, since the centrifugal heat dissipation
fan is disposed with the first outlet and the second outlet in
different radial directions and separated from each other, there
will be different corresponding manners for the heat source
configuration inside the electronic device. As such, the design
concept of the centrifugal heat dissipation fan in the prior art is
eradicated, so that the air flow may be first discharged from the
first outlet during the process of being driven and compressed via
the impeller rotation after being drawn into the housing from the
inlet in the axial direction. Also, in terms of the overall
centrifugal heat dissipation fan, the external air flow is
continuously drawn in from the inlet in the axial direction, so the
second outlet can still maintain the required air output.
Therefore, in terms of the overall air output of the fan, the total
air output for adopting the outlets in different radial directions
is significantly better than the single outlet design in the prior
art.
[0011] To make the aforementioned and other features of the
disclosure more comprehensible, several embodiments accompanied
with drawings are described in detail as follows.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1A is an exploded view of a centrifugal heat
dissipation fan according to an embodiment of the disclosure.
[0013] FIG. 1B is a top view of the centrifugal heat dissipation
fan of FIG. 1A.
[0014] FIG. 2A is an exploded view of a centrifugal heat
dissipation fan according to another embodiment of the
disclosure.
[0015] FIG. 2B is a top view of the centrifugal heat dissipation
fan of FIG. 2A.
[0016] FIG. 3 to FIG. 5 are schematic views of centrifugal heat
dissipation fans according to different embodiments of the
disclosure.
[0017] FIG. 6A to FIG. 6D are top views of heat dissipation systems
of electronic devices according to different embodiments of the
disclosure.
[0018] FIG. 7A to FIG. 7F illustrate different ranges of a first
outlet.
DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS
[0019] FIG. 1A is an exploded view of a centrifugal heat
dissipation fan according to an embodiment of the disclosure. FIG.
1B is a top view of the centrifugal heat dissipation fan of FIG.
1A. Please refer to FIG. 1A and FIG. 1B at the same time. In the
embodiment, a centrifugal heat dissipation fan 100 includes a
housing 110 and an impeller 120. The housing 110 has at least one
inlet (inlets E1 and E2 are exemplified here) disposed along an
axis L1 and at least one first outlet (first outlet E3 is
exemplified here) and a second outlet E4 located in different
radial directions, wherein the first outlet E3 and the second
outlet E4 are opposite to and separated from each other. The
impeller 120 is disposed in the housing 110 along the axis L1 (that
is, the axis L1 is regarded as the rotational axis of the impeller
120). It should be noted that the driving manner (such as driving
the impeller 120 to rotate by connecting a motor thereto) of the
centrifugal heat dissipation fan 100 can be known from the prior
art, which will be omitted without detailed reiteration in the
embodiment. When the impeller 120 rotates with the axis L1 in the
housing 110, air flow is generated, which enters the housing 110
from the inlets E1 and E2, and flows out of the housing 110 from
the first outlet E3 and the second outlet E4 in the axial
directions.
[0020] Further, the housing 110 includes a base 112, an upper cover
111, and a side wall 113, wherein the base 112 has the inlet E2,
the upper cover 111 has the inlet E1, and the side wall 113 is
substantially erected between the upper cover 111 and the base 112,
so as to form the first outlet E3 and the second outlet E4 after
the three are combined. After the impeller 120 is assembled to the
housing 110, at least one divergent channel P1 is formed. Here, a
tongue end 113c of the housing 110 is the starting point of the
divergent channel P1 and the tongue end 113c is adjacent to the
second outlet E4. The diverging direction of the divergent channel
P1 is the same as a rotational direction D1 of the impeller 120
(both are counterclockwise as shown in FIG. 1B). Since the channel
width (the gap between the blade end of the impeller 120 and the
side wall 113 of the housing 110) also diverges along with the
rotational direction D1, the air output will also increase
according to the position in the channel, wherein the first outlet
E3 is located in the middle section of the divergent channel P1 and
the second outlet E4 is located at the end of the divergent channel
P1. Therefore, the air output of the second outlet E4 is greater
than the air output of the first outlet E3, that is, in terms of
the centrifugal heat dissipation fan 100, the second outlet E4 is
regarded as the main outlet and the first outlet E3 is regarded as
the auxiliary outlet. In the embodiment, there is a non-90-degree
included angle between the air output radial direction of the first
outlet E3 and the air output radial direction of the second outlet
E4 to ensure that the two are structurally separated from each
other, wherein the second outlet E4 is a planar outlet.
[0021] The relative position and opening range of the first outlet
E3 are further defined below based on the second outlet E4. As
shown in FIG. 1B, since the first outlet E3 is disposed along with
the divergent channel P1, the first outlet E3 will also have a
divergent arc-shaped opening the same as the divergent channel P1,
which is different from the planar opening of the second outlet E4.
Here, the housing 110 has a reference radial direction R1 opposite
to the axis L1 and parallel to a plane N1 where the second outlet
E4 is located. Further, based on the reference radial direction R1
(which is regarded as 0 degrees) and in the rotational direction D1
along the impeller 120, the starting point of the first outlet E3
according to the embodiment is located at a position with a central
angle .theta.1 of 30 degrees relative to the reference radial
direction R1 and the end point of the first outlet E3 is located at
a position with a central angle .theta.2 of 150 degrees relative to
the reference radial direction R1, that is, the radial direction
range of the first outlet E3 according to the embodiment has a
central angle of 120 degrees relative to the axis L1.
[0022] It should also be mentioned that the orthographic projection
size of the first outlet E3 according to the embodiment on the axis
L1 is smaller than the orthographic projection size of the housing
110 on the axis L1. That is, as shown in FIG. 1A, in the thickness
(height) direction parallel to the axis L1, the first outlet E3 has
a size h2, which is less than a size h1 of the side wall 113. In
other words, the first outlet E3 according to the embodiment
belongs to a semi-open structure, which is equivalent to a
structure 113a and a structure 113b of the side wall 113 having
different thicknesses, wherein the first outlet E3 is located at
the structure 113b to control the wind direction of the centrifugal
heat dissipation fan 100, which is especially suitable for the heat
dissipation system in a layered configuration, that is, the
positions of the heat source and other structures belong to
different layers in the thickness direction along the axis L1.
Therefore, the first outlet E3 according to the embodiment can
provide the required heat dissipation performance with respect to
where the heat source is located.
[0023] Furthermore, since the first outlet E3 belongs to a
semi-open structure, the divergent channel P1 according to the
embodiment is divided into a first channel P11, a second channel
P12, and a third channel P13. The third channel P13 is connected
between the first channel P11 and the second channel P12. Also,
according to the diverging feature, the channel widths diverge in
sequence from the first channel P11, the third channel P13, and the
second channel P12. The tongue end 113c is regarded as the starting
point of the first channel P11, and the paths of the third channel
P13 and the first outlet E3 are overlapped with each other, thereby
forming a cyclically and adjacently connected structure of the
first channel P11, the first outlet E3 (third channel P13), the
second channel P12, and the second outlet E4, so that when the air
flow is output from the first outlet E3, a portion of the air flow
may continue to be compressed by the impeller 120 along the third
channel P13, transmitted to the second channel P12 to continue
compression, and finally output from the second outlet E4.
[0024] FIG. 2A is an exploded view of a centrifugal heat
dissipation fan according to another embodiment of the disclosure.
FIG. 2B is a top view of the centrifugal heat dissipation fan of
FIG. 2A. Please refer to FIG. 2A and FIG. 2B at the same time,
wherein the same components as the previous embodiment are shown by
the same reference numerals and will not be reiterated in detail.
In the embodiment, a centrifugal heat dissipation fan 200 includes
a housing 210 and an impeller 120, wherein the housing 210 includes
an upper cover 211, a base 212, and a side wall 213 erected between
the two. The difference from the foregoing embodiment is that the
side wall 213 includes a structure 213a and a structure 213b
opposite to each other, wherein the structure 213a has a tongue end
213c, so that the impeller 120 and the housing 210 form a divergent
channel P2, and a first outlet E3 and a second outlet E4 opposite
to each other, wherein the divergent channel P2 includes a first
channel P21 and a second channel P22 maintaining the diverging
feature, that is, the channel width of the first channel P21 is
less than the channel width of the second channel P22.
[0025] In addition, the housing 210 also has a reference radial
direction R1 parallel to a plane N1 where the second outlet E4 is
located as the basis, but the difference is that the starting point
of the first outlet E3 is located at a position with a central
angle .theta.3 of -20 degrees relative to the reference radial
direction R1 and the end point of the first outlet E3 is located at
a position with a central angle .theta.4 of 180 degrees relative to
the reference radial R1, that is, the radial direction range of the
first outlet E3 has a central angle of 200 degrees relative to the
axis L1.
[0026] FIG. 3 to FIG. 5 are schematic views of centrifugal heat
dissipation fans according to different embodiments of the
disclosure. Please refer to FIG. 3 first. A housing 310 of a
centrifugal heat dissipation fan 300 as shown has multiple first
outlets E5, which are distributed along a divergent channel and are
located in different radial directions. Here, the spacing between
adjacent first outlets E5 is not limited, which may be
appropriately adjusted according to the requirements of the heat
dissipation system. Please refer to FIG. 4. A housing 410 of a
centrifugal heat dissipation fan 400 as shown has multiple first
outlets E5 and E61 to E64, wherein the first outlet E5 is as shown
in FIG. 3 and the first outlets E61 to E64 are respectively
presented with different opening contours. Here, the opening
contours of the first outlets E5 and E61 to E64 are not limited,
which may be appropriately adjusted according to the requirements
of the heat dissipation system.
[0027] Please refer to FIG. 5. A housing 510 of a centrifugal heat
dissipation fan 500 as shown has multiple guiding structures 511
adjacent to first outlets E71 to E74 in addition to the first
outlets E71 to E74 distributed along a divergent channel and
located in different radial directions. Each guiding structure 511
extends from the first outlets E71 to E74 away from the impeller
120, that is, extends away from an axis L1.
[0028] FIG. 6A to FIG. 6D are top views of heat dissipation systems
of electronic devices according to different embodiments of the
disclosure. It should be stated first that the following heat
dissipation systems may all adopt the centrifugal heat dissipation
fans 100 to 500 of the different embodiments above according to
requirements. Please refer to FIG. 6A first. The heat dissipation
system of the electronic device shown includes a body 20, multiple
heat sources 21 and 22, a heat conduction element 24, a heat
dissipation fin 23, and a centrifugal heat dissipation fan 600,
wherein the heat sources 21 and 22 include electronic chips, such
as central processing and display chips, which respectively
transmit the heat generated to the heat dissipation fin 23 by the
heat conduction element 24. In the embodiment, a first outlet E3 of
the centrifugal heat dissipation fan 600 corresponds to the heat
sources 21 and 22, and a second outlet E4 corresponds to the heat
dissipation fin 23. Therefore, in the heat dissipation system, the
centrifugal heat dissipation fan 600 still mainly uses the second
outlet E4 to dissipate heat from the heat dissipation fin 23.
However, since the first outlet E3 may also directly dissipate heat
from the heat sources 21 and 22, the heat transmitted from the heat
sources 21 and 22 to the heat dissipation fin 23 is expected to be
reduced, thereby reducing the heat dissipation burden of the
centrifugal heat dissipation fan 600 at the second outlet E4.
Therefore, the embodiment achieves the effect of dispersing the
heat dissipation burden by enabling the centrifugal heat
dissipation fan 600 to have the first outlet E3 and the second
outlet E4 in different radial directions, thereby improving the
overall heat dissipation efficiency.
[0029] Here, the heat conduction element 24 is exemplified by a
heat pipe, but in other embodiments not shown, the heat conduction
element 24 may also be a vapor chamber.
[0030] Please refer to FIG. 6B, the difference from the previous
embodiment is that a centrifugal heat dissipation fan 600A
according to the present embodiment is, for example, as shown in
FIG. 5 to have a guiding structure 610 located at an outlet, so as
to correspondingly guide the air flow output toward the heat
sources 21 and 22, and finally discharge the heat dissipation air
flow from the same side of a body 20A.
[0031] Please refer to FIG. 6C. Another configuration is adopted in
a body 20B according to the embodiment, that is, a first outlet E3
and a second outlet E4 of a centrifugal heat dissipation fan 600
each corresponds to a heat source 21 or 22 and each corresponds to
a heat dissipation fin 23. Please refer to FIG. 6D. The heat
dissipation system as shown further uses a pair of centrifugal heat
dissipation fans 600, so that each corresponds to a heat source and
each corresponds to a heat dissipation fin 23, wherein the heat
sources 21 and 22 may simultaneously withstand the air flow output
from the first outlet E3 of different centrifugal heat dissipation
fans 600 to be output from a body 20C after the heat dissipation
converge.
[0032] Based on FIG. 6A to FIG. 6D, the heat dissipation system of
the electronic device may correspond to different configurations of
the heat sources 21 and 22 by the presence of the first outlet E3
and the second outlet E4 of the centrifugal heat dissipation fan
600, thereby improving the application scope of the heat
dissipation system of the electronic device.
[0033] FIG. 7A to FIG. 7F illustrate different ranges of a first
outlet. Relevant data shown in the following table is obtained by
detecting the air output of the first outlet, wherein the
rotational speed of the impeller 120 is 4000 rpm and the unit of
air volume is cubic feet per minute (CFM):
TABLE-US-00001 Corresponding figure FIG. 7A FIG. 7B FIG. 7C FIG. 7D
FIG. 7E FIG. 7F Air output 5.70 6.17 6.69 7.24 7.52 7.78 of first
outlet (CFM) Air output 9.10 9.07 8.56 8.02 7.75 7.51 of second
outlet (CFM) Total air 14.80 15.24 15.25 15.26 15.27 15.29 output
(CFM)
[0034] It can be clearly known from the above table that under the
premise that the range of a first outlet E8 is at a central angle
of 150 degrees, changes in a starting point ST and an end point EN
thereof will also cause changes in the corresponding air output of
a first outlet E8 and a second outlet E4. A plane N2 that has
passed an axis L1 of an impeller 120 is taken as the basis, wherein
the plane N2 is parallel to a plane N1 where the second outlet E4
is located. When the starting point ST is less than -20 degrees (ST
is located at a position of -30 degrees as shown in FIG. 7A), the
total air output is relatively small. When the central angle of the
position of the end point EN gradually increases, the air output of
the first outlet E8 also increases accordingly until the air output
of the first outlet E8 is greater than the air output of the second
outlet E4 shown in FIG. 7F. Based on the above, the range of the
first outlet E8 according to the embodiment is limited to the range
as shown in FIG. 7B to FIG. 7E, such that the position of the
starting point ST needs to be greater than a central angle of -20
degrees and the position of the end point EN needs to be less than
a central angle of 180 degrees to ensure that the air output of the
first outlet E8 is less than the air output of the second outlet E4
under the premise that the total air output is increased.
[0035] In summary, in the above embodiments of the disclosure,
since the centrifugal heat dissipation fan is disposed with the
first outlet and the second outlet in different radial directions
and separated from each other, there will be different
corresponding manners for the heat source configuration inside the
electronic device. As such, the design concept of the centrifugal
heat dissipation fan in the prior art is eradicated, so that the
air flow may be first discharged from the first outlet during the
process of being driven and compressed via the impeller rotation
after being drawn into the housing from the inlet in the axial
direction. Also, in terms of the overall centrifugal heat
dissipation fan, the external air flow is continuously drawn in
from the inlet in the axial direction, so the second outlet can
still maintain the required air output. Therefore, in terms of the
overall air output of the fan, the total air output for adopting
the outlets in different radial directions is significantly better
than the single outlet design in the prior art.
[0036] Furthermore, in terms of the centrifugal heat dissipation
fan, due to the design of the divergent channel, the second outlet
still maintains a relatively large air output and is used as the
main heat dissipation air flow outlet without the air output
thereof being reduced due to the presence of the first outlet.
Therefore, for the overall centrifugal heat dissipation fan, the
presence of the first outlet may be used as an additional heat
dissipation air flow outlet in addition to maintaining the original
overall air output, so as to increase the usage modes of the
centrifugal heat dissipation fan.
[0037] In addition, the heat dissipation system of the electronic
device can provide corresponding heat dissipation solution
according to the required internal heat source configuration by
having the centrifugal heat dissipation fan disposed with the first
outlet and the second outlet in different radial directions, so as
to optimize the heat dissipation system of the electronic device
and improve the application scope thereof.
[0038] Although the disclosure has been disclosed in the above
embodiments, the embodiments are not intended to limit the
disclosure. It will be apparent to persons skilled in the art that
various modifications and variations can be made to the disclosed
embodiments without departing from the scope or spirit of the
disclosure. In view of the foregoing, it is intended that the
disclosure covers modifications and variations provided that they
fall within the scope of the following claims and their
equivalents.
* * * * *