U.S. patent application number 13/513507 was filed with the patent office on 2012-12-06 for heat sink.
This patent application is currently assigned to KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY. Invention is credited to Dong-Kwon Kim, Juwan Kim, Sung Jin Kim.
Application Number | 20120305224 13/513507 |
Document ID | / |
Family ID | 44115090 |
Filed Date | 2012-12-06 |
United States Patent
Application |
20120305224 |
Kind Code |
A1 |
Kim; Sung Jin ; et
al. |
December 6, 2012 |
HEAT SINK
Abstract
A heat sink provided. In the heat sink in accordance with an
embodiment of the present invention, a heat dissipation plate forms
a channel between each of stages by isolating a plurality of heat
dissipating fins in equal intervals and arranging the heat
dissipating fins in a multi-stage circle shape. Then, the heat sink
forms a path between the sequentially isolated heat dissipating
fins at each of the stages. Also, a centrifugal fan alternatively
blocks the channel and path at each of the stages through a
rotation by a plurality of blades arranged in a multi-stage circle
shape to be positioned between the channels. Then, the centrifugal
fan is capable of inflowing outer air to discharge the air by
generating a pressure difference of inter/outer air through a
combination of the blade and the heat dissipation plate.
Inventors: |
Kim; Sung Jin; (Daejeon,
KR) ; Kim; Juwan; (Daejeon, KR) ; Kim;
Dong-Kwon; (Seoul, KR) |
Assignee: |
KOREA ADVANCED INSTITUTE OF SCIENCE
AND TECHNOLOGY
Yuseong-gu, Daejeon
KR
|
Family ID: |
44115090 |
Appl. No.: |
13/513507 |
Filed: |
December 2, 2009 |
PCT Filed: |
December 2, 2009 |
PCT NO: |
PCT/KR2009/007159 |
371 Date: |
August 10, 2012 |
Current U.S.
Class: |
165/104.34 |
Current CPC
Class: |
F04D 29/281 20130101;
F04D 17/16 20130101; F04D 29/582 20130101; H01L 23/467 20130101;
F04D 17/127 20130101; F04D 29/30 20130101; F28F 3/02 20130101; H01L
2924/0002 20130101; H01L 2924/00 20130101; H01L 2924/0002
20130101 |
Class at
Publication: |
165/104.34 |
International
Class: |
F28D 15/00 20060101
F28D015/00 |
Claims
1. A heat sink comprising: a heat dissipation plate forming a
channel between each of stages by isolating a plurality of heat
dissipating fins in equal intervals and arranging the heat
dissipating fins in a multi-stage circle shape, forming a path
between the sequentially isolated heat dissipating fins at each of
the stages; and a centrifugal fan alternatively blocking the
channel and path at each of the stages through a rotation by a
plurality of blades arranged in a multi-stage circle shape to be
positioned between the channels, inflowing outer air to discharge
the air by generating a pressure difference of inter/outer air
through a combination of the blade and the heat dissipation
plate.
2. The heat sink of claim 1, wherein the heat dissipation plate
includes a second flange in which the heat dissipation fins are
mounted vertically upward with respect to the second flange, and a
motor is set vertically upward on an upper surface of the second
flange.
3. The heat sink of claim 2, wherein the centrifugal fan prepares a
first flange in which the blades are mounted vertically downward
with respect to the blade to form an inflow hole and is rendered to
be rotated by fixing a rotary shaft of the motor by a connection
hole of a combination block after positioning the combination block
supported by a rib at a center of the inflow hole.
4. The heat sink of claim 1, wherein the path is a space between
the sequentially isolated heat dissipation fins at equal intervals
and has a virtual arc shape which is radiated outwardly from a
center of the second flange under the condition that the heat
dissipation fins are arranged in a multi-stage concentric circle
shape.
5. The heat sink of claim 1, wherein the blades are arranged to be
crossed between the channels and paths of each of stages in the
heat dissipation plate.
6. The heat sink of claim 1, wherein the heat dissipation fins and
blades have an incline line on one side thereof, and the incline
lines has an angle inside from outside thereof toward a rotational
direction of the heat dissipation plate.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates generally to heat sinks. More
particularly, the invention relates to a heat sink for enhancing
cooling efficiency due to the improvement of air flow generated by
splitting zones of heat dissipation fins, which are configured with
a multi-stage concentric circle shape after the heat dissipation
fins and blades are arranged in a multi-stage circle shape and
mutually combined.
[0003] 2. Description of the Related Art
[0004] Due to the current trend toward highly integration, highly
efficiency, miniaturization of semiconductor chips, packages, and
the like, electronic components become highly efficient rapidly.
Accordingly, there have been various attempts to maintain
efficiency of electronic components by efficiently and rapidly
discharging heat generated while operating the electronic
components. This heat discharging is associated with the
development in the electronic components.
[0005] Particularly, as the capacity of CPUs and peripheral
electronic elements become relatively large, heat amount is
extremely increased.
[0006] To stably secure functions of electronic components, cooling
means have been adopted.
[0007] To solve the aforementioned problems in the prior art,
Korean Laid-Open Patent Publication No. 2004-52010 entitled
"Apparatus for cooling electronic chip" that was previously
proposed discloses a terminal base transfers the heat by directly
contacting to a heated element such as a CPU. Heat pipes are
soldered to an upper part of the terminal base. Heat radiating
blocks are soldered to an end of the heat pipe. A fan motor
supplies a cooling fluid to the heat radiating block by placing to
a center of the heat radiating block. A base frame fixes the fan
motor and the terminal base. A fan cover efficiently
inflows/discharges the cooling fluid by blocking a majority portion
excepting the upper center of the part installing the fan motor.
The fan cover formed to a lower side of the heat pipe is formed as
one body by soldering to the heat pipe. Thus, the heat of the heat
pipe is transferred/discharged to the air.
[0008] In the above mentioned apparatus, heat generated from
heating elements such as CPUs is conducted through the terminal
base to the heat pipes, and then moved to the heat radiating blocks
that are formed at each of ends of the heat pipes. The heat moved
to the heat radiating blocks drive the fan motor and creates a
forced convection current to be cooled.
[0009] Also, Korean Laid-Open Patent Publication No. 2004-52010
entitled "Apparatus for cooling computer parts and method of
manufacturing the same" that was previously proposed discloses The
apparatus includes a heat transferring block capable of being
thermally coupled to the heat generating parts to conduct the heat
generated by the heat dissipating parts, at least one heat pipe,
each including a block coupling portion thermally coupled to the
heat transferring block and a fin coupling portion formed of a
generally curved shape composed essentially of one or more circular
arc portions, and a plurality of heat dissipating fins, each having
at least one perforation hole. The geometry of the curvature of the
entirety of the fin coupling portion is shaped so that the geometry
alone would not allow the heat pipe to be inserted through the
perforation hole of the heat dissipating fins. The fin coupling
portion of the heat pipe passes through each of the at least one
perforation hole of the plurality of heat dissipating fins. Each of
the heat dissipating fins are spaced apart from one another along
the fin coupling portion and positioned to the fin coupling
portion.
[0010] When heat is transferred to the heat transferring block, it
escapes through the air through the heat pipe at parts excepting
combination parts with the heat transferring block. As a result,
the heat is cooled. The plurality of heat dissipating fins can cool
electronic components by passing air flow generated from a cooling
fan thereinto and discharging the air flow to the outside in a
spiral shape with respect to a rotary shaft of the cooling fan.
[0011] However, in the above-mentioned apparatus for cooling, there
is a problem in that outer air inflows according to a rotary shaft
of a fan employing an axial fan and passes heat dissipating fins to
be discharged toward an axial direction, thereby reducing cooling
efficiency.
[0012] In other words, the temperature of the heat dissipating fins
is cooled through the axial fan, which is mounted on upper parts of
the heat dissipating fins where the heat generated from heating
components such as CPUs is transferred. The upper parts of the heat
dissipating fins first face with wind created by the axial fan to
be cooled, and then lower parts thereof become cooled
sequentially.
[0013] In this case, the power of the wind by the axial fan is
decreased by interference of the heat dissipating fins, thereby
reducing cooling efficiency.
[0014] Due to the interference of the heat dissipating fins, the
cooling power on the lower parts of the heat dissipating fins
positioned at a region close to a CPU is reduced. For this reason,
the temperature is high on the lower parts of the heat dissipating
fins located at a region close to a CPU. To the contrary, on upper
parts of the heat dissipating fins located at a region far from the
CPU, the temperature is relatively low. As a result, heat
discharging efficiency is reduced.
BRIEF SUMMARY OF THE INVENTION
[0015] Accordingly, the present invention is to address the
above-mentioned problems and/or disadvantages and to offer at least
the advantages described below.
[0016] An aspect of the present invention is to provide a heat
sink. Particularly, one aspect of the present invention is to
provide a heat sink for improving inflow and discharging of air by
repeatedly splitting each of stages of heat dissipation fins by
rotating a centrifugal fan after the centrifugal fan for arranging
the heat dissipation fins in a multi-stage concentric circle shape
and a heat dissipation plate are mutually combined.
[0017] Embodiments of the present invention provide a heat sink
comprising: a heat dissipation plate forming a channel between each
of stages by isolating a plurality of heat dissipating fins in
equal intervals and arranging the heat dissipating fins in a
multi-stage circle shape, forming a path between the sequentially
isolated heat dissipating fins at each of the stages; and a
centrifugal fan alternatively blocking the channel and path at each
of the stages through a rotation by a plurality of blades arranged
in a multi-stage circle shape to be positioned between the
channels, inflowing outer air to discharge the air by generating a
pressure difference of inter/outer air through a combination of the
blade and the heat dissipation plate.
[0018] In some embodiments of the present invention, the heat
dissipation plate includes a second flange in which the heat
dissipation fins are mounted vertically upward with respect to the
second flange, and a motor is set vertically upward on an upper
surface of the second flange.
[0019] In some embodiments of the present invention, the
centrifugal fan prepares a first flange in which the blades are
mounted vertically downward with respect to the blade to form an
inflow hole and is rendered to be rotated by fixing a rotary shaft
of the motor by a connection hole of a combination block after
positioning the combination block supported by a rib at a center of
the inflow hole.
[0020] In some embodiments of the present invention, the path is a
space between the sequentially isolated heat dissipation fins at
equal intervals and has a virtual arc shape which is radiated
outwardly from a center of the second flange under the condition
that the heat dissipation fins are arranged in a multi-stage
concentric circle shape.
[0021] In some embodiments of the present invention, the blades are
arranged to be crossed between the channels and paths of each of
stages in the heat dissipation plate.
[0022] In some embodiments of the present invention, the heat
dissipation fins and blades have an incline line on one side
thereof, and the incline lines has an angle inside from outside
thereof toward a rotational direction of the heat dissipation
plate.
[0023] Other aspects, advantages, and salient features of the
invention will become apparent to those skilled in the art from the
following detailed description, which, taken in conjunction with
the annexed drawings, discloses exemplary embodiments of the
invention.
ADVANTAGEOUS EFFECTS
[0024] As above mentioned, a heat sink according to the present
invention, after the centrifugal fan for arranging heat dissipation
fins in a multi-stage concentric circle shape and a heat
dissipation plate are mutually combined, repeatedly splits each of
stages of heat dissipation fins by rotating a centrifugal fan to
generate an internal/external pressure difference of the heat sink,
so that external air flow is increased, thereby improving cooling
efficiency.
[0025] Furthermore, the heat sink according to the present
invention is formed by superimposing the centrifugal fan and
dissipation plate, thereby minimizing a volume. As a result, the
miniaturization of products is possible.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] FIG. 1 is an exploded, perspective view illustrating a heat
sink in accordance with an embodiment of the present invention.
[0027] FIG. 2 is a perspective view illustrating a heat sink in
accordance with an embodiment of the present invention.
[0028] FIG. 3 is a side sectional view illustrating a heat sink in
accordance with an embodiment of the present invention.
[0029] FIG. 4 is a front view illustrating a heat dissipation plate
of a heat sink in accordance with an embodiment of the present
invention.
[0030] FIG. 5 is a front view illustrating a centrifugal fan of a
heat sink in accordance with an embodiment of the present
invention.
[0031] FIG. 6 is a cross-sectional view illustrating a heat sink in
accordance with an embodiment of the present invention.
[0032] FIG. 7 is a photograph showing an experimental test of a
heat sink in accordance with an embodiment of the present
invention.
TABLE-US-00001 <Brief explanation of essential parts of the
drawings> 10: Heat sink, 100: Centrifugal Fan, 110: First
Flange, 111: Inflow Hole, 120: Rib, 130: Combination Block, 131:
Connection Hole, 140: Blade, 150: Incline Line, 200: Heat
Dissipation Plate, 210: Second Flange, 220: Motor, 221: Rotary
Shaft, 230: Heat Dissipation fin, 240: Channel.
DETAILED DESCRIPTION OF THE INVENTION
[0033] Exemplary, non-limiting embodiments of the present invention
will now be described more fully with reference to the accompanying
drawings. This invention may, however, be embodied in many
different forms and should not be construed as limited to the
exemplary embodiments set forth herein. Rather, the disclosed
embodiments are provided so that this disclosure will be thorough
and complete, and will fully convey the scope of the invention to
those skilled in the art. The principles and features of this
invention may be employed in varied and numerous embodiments
without departing from the scope of the invention.
[0034] Furthermore, well known or widely used techniques, elements,
structures, and processes may not be described or illustrated in
detail to avoid obscuring the essence of the present invention.
Although the drawings represent exemplary embodiments of the
invention, the drawings are not necessarily to scale and certain
features may be exaggerated or omitted in order to better
illustrate and explain the present invention.
[0035] FIG. 1 is an exploded, perspective view illustrating a heat
sink in accordance with an embodiment of the present invention.
FIG. 2 is a perspective view illustrating a heat sink in accordance
with an embodiment of the present invention. FIG. 3 is a side
sectional view illustrating a heat sink in accordance with an
embodiment of the present invention. FIG. 4 is a front view
illustrating a heat dissipation plate of a heat sink in accordance
with an embodiment of the present invention. FIG. 5 is a front view
illustrating a centrifugal fan of a heat sink in accordance with an
embodiment of the present invention. FIG. 6 is a cross-sectional
view illustrating a heat sink in accordance with an embodiment of
the present invention. FIG. 7 is a photograph showing an
experimental test of a heat sink in accordance with an embodiment
of the present invention.
[0036] As shown in FIGS. 1 to 6, a heat sink 10 according to the
present invention comprises a heat dissipation plate 200 and a
centrifugal fan 100.
[0037] The heat sink 10 generates a pressure difference of
inter/outer air to inflow outer air thereinto. Then, the heat sink
discharges outer air to the outside, so that a heat exchanging
mechanism occurs.
[0038] The heat dissipation plate 200 includes a second plate
flange 210. A motor 220 is fixed vertically upward at a center of
an upper surface of the second flange 210. A rotary shaft 221 of
the motor is positioned upward.
[0039] And, a heat dissipation fin 230 with a face is mounted to be
located upright on the upper surface of the second flange 210
[0040] In this case, a plurality of heat dissipation fins 230 are
isolated at a predetermined interval and arranged in a circle at
the same time. Between isolated spaces of the heat dissipation fins
230, a path 250 for inducing air flow is formed.
[0041] The path 250 is a space between the sequentially isolated
heat dissipation fins 230 at equal intervals and has a virtual arc
shape which is radiated outwardly from a center of the second
flange 210 under the condition that the heat dissipation fins 230
are arranged in a multi-stage concentric circle shape.
[0042] The plurality of heat dissipation fins with a circular
structure are arranged in the multi-stage concentric circle shape,
thereby slowing down air flow between each of the stages, so that a
channel 240 for heat exchanging in the heat dissipation fin 230 is
formed.
[0043] The channel 240 is at least one or more, and the following
descriptions will be given on the assumption that the number of the
channel 240 is four and formed as four stages in the present
invention.
[0044] And, the centrifugal 100 includes a first plate flange 110.
A plurality of blades 140 with faces that are vertically downward
110 are mounted on a lower surface of the first flange
[0045] The blades 140 are arranged in a multi-stage concentric
circle shape to be positioned between the channels 240. The
position of the blade 140 at each of the stages is arranged to be
crossed, so that the blade 140 alternatively interrupts the channel
240 and path 250 at each of the stages.
[0046] One side of the heat dissipation fin 230 and blade 140 has
an incline line. The incline line has an angle inside from outside
thereof toward a rotational direction of the centrifugal fan 100.
Accordingly, air can smoothly flow at a step type at each of the
stages of the channel 240.
[0047] Moreover, the centrifugal fan 100 forms an inflow hole 111
at a center of the first flange 110. The centrifugal fan 100, after
positioning a combination block 130 supported by a rib 120 at a
center of the inflow hole 111, is rendered to be rotated by fixing
the rotary shaft 221 of the motor 220 by the connection hole 131 of
the combination block 130 in the heat dissipation plate 200.
[0048] The heat sink 10 with above-mentioned structure according to
the present invention is adheredly mounted to an electronic
component for requiring a cooling system.
[0049] Hereinafter, the heat sink according to the present
invention will be described in more detail later.
[0050] In advance, the following descriptions will be given on the
assumption that the channel 240 located most inside the blades 140
and heat dissipation fin 230 arranged in a multi-stage concentric
circle shape is a first stage, and the channels located outside the
first stage are a second step, and a third step, respectively.
[0051] When the rotary shat 221 is rotated by applying a drive
signal to the motor 220, the first flange 110 rotates the blade 140
in line with the combination block, which is fixed in one entity
with the rotary shaft 221.
[0052] Here, the blade 140 becomes rotated in each of the channels
240 of the heat dissipation plate 200.
[0053] Outer air inflows into the inflow hole 111 of the
centrifugal fan 100, and then inflows into the channel of the
second stage through the path 250 of the first stage. The inflown
air flows to the channels between front and rear sides of two heat
dissipation fins 230 located at the channel 240 of the second stage
through the blade 140 of the second stage.
[0054] At this time, the air is thermally conducted and then flows
to channel 240 of the third step through the path 250. This process
is repeatedly performed, so that the air is discharged to the
outside through the path 250, which is located most outside.
[0055] Like this, when air flow is performed in the heat
dissipation fin 230, the heat dissipation plate 200 receiving heat
through the second flange 200 adhered to an electronic component
for requiring cooling can be cooled by inflowing outer air.
[0056] Experimental embodiments of a heat power in the heat sink 10
according to the present invention will be described below under
the following condition.
[0057] A heater is connected to a bottom surface of the heat sink
10. Then, heat is provided to set up a general heat environment of
electronic components. To measure heat temperature varied depending
on the number of revolutions of the centrifugal fan in the heat
sink 10, an apparatus for measuring heat is prepared.
[0058] The value measured by the above apparatus is shown in Table
1.
TABLE-US-00002 TABLE 1 RPM of Thermal heat sink resistance (K/W)
550 0.87152 580 0.83054 710 0.76863 720 0.75675 815 0.70693 850
0.67474 965 0.62133 1015 0.60006 1075 0.57428 1100 0.53267 1190
0.51314
[0059] By substituting the measured value into the formula 1 and
then dividing the difference between the maximum temperature and
the temperature of external fluid by the heat amount applied to the
heat sink 10, thermal resistance is measured, there is given:
R = ( T max - T bnin ) Q ( where Q = Q heater - Q loss )
##EQU00001##
[0060] The following graph shows the deducted results.
[0061] As well known in the above, we found that the temperature
becomes dramatically reduced as the RPM of the heat sink 10 is
increased. In this case, we proved excellent cooling efficiency of
the heat sink 10.
[0062] While this invention has been particularly shown and
described with reference to an exemplary embodiment thereof, it
will be understood by those skilled in the art that various changes
in form and details may be made therein without departing from the
spirit and scope of the invention as defined by the appended
claims.
* * * * *