U.S. patent application number 13/423318 was filed with the patent office on 2013-02-07 for external cellular heat sink structure.
The applicant listed for this patent is Takeho HSU. Invention is credited to Takeho HSU.
Application Number | 20130032322 13/423318 |
Document ID | / |
Family ID | 47626203 |
Filed Date | 2013-02-07 |
United States Patent
Application |
20130032322 |
Kind Code |
A1 |
HSU; Takeho |
February 7, 2013 |
EXTERNAL CELLULAR HEAT SINK STRUCTURE
Abstract
An external cellular heat sink structure includes a base and a
heat dissipating body integrally formed on the base. The heat
dissipating body includes a plurality of hollow cellular units,
wherein the neighboring cellular units are connected together, and
each cellular unit has at least two openings for communicating the
connected cellular units with each other. Thus, the cellular unit
can provide the larger dissipation area, and each opening can let
the gas pass and disperse the gas so that the time and possibility
for the gas to contact the heat dissipating surface are lengthened
and increased, respectively, and the heat dissipation efficiency is
increased.
Inventors: |
HSU; Takeho; (Taipei City,
TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HSU; Takeho |
Taipei City |
|
TW |
|
|
Family ID: |
47626203 |
Appl. No.: |
13/423318 |
Filed: |
March 19, 2012 |
Current U.S.
Class: |
165/185 |
Current CPC
Class: |
F21Y 2115/10 20160801;
F28F 3/02 20130101; F21W 2131/103 20130101; F21V 29/81 20150115;
F21V 29/74 20150115 |
Class at
Publication: |
165/185 |
International
Class: |
F28F 7/00 20060101
F28F007/00 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 2, 2011 |
TW |
100214231 |
Claims
1. An external cellular heat sink structure, comprising: a base;
and a heat dissipating body integrally formed on the base, wherein
the heat dissipating body comprises a plurality of hollow cellular
units, the neighboring cellular units are connected together, and
each of the cellular units has at least two openings communicating
with the connected cellular units.
2. The heat sink structure according to claim 1, wherein the
cellular unit has a hexagonal column structure.
3. The heat sink structure according to claim 1, wherein the two
openings of the cellular unit extend in different directions.
4. The heat sink structure according to claim 1, wherein the two
openings of the cellular unit are disposed opposite each other.
5. The heat sink structure according to claim 1, wherein each of
two sides of one of the openings of the cellular unit has a cell
wall, and a wall edge of one of the cell walls is an arced wall
edge.
6. The heat sink structure according to claim 1, wherein a top edge
of the heat dissipating body is formed with an arced structure
having two sides and a middle portion higher than the two
sides.
7. The heat sink structure according to claim 1, wherein a top edge
of the heat dissipating body is formed with a continuous arced wavy
structure.
8. The heat sink structure according to claim 1, wherein the base
is an upper lamp shell of a LED road lamp.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The invention relates to a technological field of a heat
sink, and more particularly to an external cellular heat
dissipating structure, which can be applied to a LED road lamp, a
solar thermoelectric conversion apparatus or any other apparatus or
element requiring heat dissipation by way of heat transfer.
[0003] 2. Related Art
[0004] A typical light-emitting diode (LED) apparatus, such as a
LED road lamp, generates a lot of heat with the elapse of time
after being turned on. The high-temperature causes poor effects,
such as the lowered working efficiency and endurability, to the LED
apparatus. Thus, the typical LED apparatus is almost equipped with
a heat sink or a heat dissipating system to perform the heat
dissipation. The frequently seen heat sink is composed of many heat
dissipating fins, which are arranged in parallel at the same level
so that the heat is dissipated to the atmosphere through the
surface of each heat dissipating fin. In addition, the flowing air
streams can take the heat away through the gaps between the heat
dissipating fins.
[0005] Because the heat sink is exposed to the atmosphere, the
rain, dust or leaves may directly fall on the heat dissipating
fins. Therefore, in order to prevent the problems, such as the
unpredictable leakage current, the short-circuit condition or the
fan failure, the outdoor heat sink is not suitable for the working
in conjunction with the fan.
[0006] One method for increasing the heat dissipation efficiency is
to increase the number of the heat dissipating fins to enlarge the
dissipation area. However, increasing the number of heat
dissipating fins would decrease the gap between the neighboring
heat dissipating fins. In addition, the parallel and contour
structure of the heat dissipating fins disables the heat inside the
inner heat dissipating fins from being easily dissipated. Thus, the
heat accumulation is produced, and the heat dissipation effect
cannot be substantially enhanced.
[0007] Also, the too-dense heat dissipating fins increase the
possibility of the accumulation of the dust or leaves, and disable
the flowing air streams from easily passing through the gaps
between the heat dissipating fins so that the heat dissipation
efficiency of the heat sink is poor.
SUMMARY OF THE INVENTION
[0008] It is therefore an object of the invention to provide an
external cellular heat sink structure with the larger dissipation
area, so that the flowing air streams can flow within the heat sink
in many directions and the heat sink has the higher heat
dissipation efficiency.
[0009] According to the above-identified object and effect, the
invention discloses an external cellular heat sink structure
including a base and a heat dissipating body integrally formed on
the base. The heat dissipating body includes a plurality of hollow
cellular units. The neighboring cellular units are connected
together, and each cellular unit has at least two openings for
communicating the connected cellular units with each other.
[0010] Thus, the cellular unit can provide the larger dissipation
area, and each opening can let the air streams or gas streams pass
and disperse the air streams or gas streams so that the time and
possibility for the air streams or gas streams to contact the heat
dissipating surface are lengthened and increased, respectively, and
the heat dissipation efficiency is increased.
[0011] Further scope of the applicability of the present invention
will become apparent from the detailed description given
hereinafter. However, it should be understood that the detailed
description and specific examples, while indicating preferred
embodiments of the present invention, are given by way of
illustration only, since various changes and modifications within
the spirit and scope of the present invention will become apparent
to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The present invention will become more fully understood from
the detailed description given hereinbelow and the accompanying
drawings which are given by way of illustration only, and thus are
not limitative of the present invention.
[0013] FIG. 1 is a pictorial view showing a first embodiment of the
invention.
[0014] FIG. 2 is a schematic plane view showing the first
embodiment of the invention.
[0015] FIG. 3 is a schematic plane view showing a second embodiment
of the invention.
[0016] FIG. 4 is a schematic illustration showing a top-view
structure and gas flow directions of the invention.
[0017] FIG. 5 is a schematic illustration showing another top-view
structure and gas flow directions of the invention.
[0018] FIG. 6 is a schematic illustration showing still another
top-view structure and gas flow directions of the invention.
[0019] FIG. 7 is a pictorial view showing that one side of an
opening of the cellular unit of the invention has an arced wall
edge.
[0020] FIG. 8 is a schematic illustration showing another structure
according to a third embodiment of the invention.
[0021] FIG. 9 is a schematic illustration showing that the
invention is applied to a structure of a LED road lamp.
DETAILED DESCRIPTION OF THE INVENTION
[0022] The present invention will be apparent from the following
detailed description, which proceeds with reference to the
accompanying drawings, wherein the same references relate to the
same elements.
[0023] Referring to FIGS. 1 and 2, a heat sink 10 includes a base
12 and a heat dissipating body 14 integrally formed on the base
12.
[0024] In detail, the heat dissipating body 14 includes a plurality
of hollow cellular units 16, wherein the neighboring cellular units
16 are connected together. In addition, the top edge of the heat
dissipating body 14 is formed with an arced structure 32 (see FIG.
2) having two sides and a middle portion higher than the two
sides.
[0025] As shown in FIG. 3, the top edge of the heat dissipating
body 14 may be formed with a continuous arced wavy structure 34
having peaks that may be located at the same level.
[0026] According to the above-mentioned disclosure, the peaks of
the arced wavy structure 34 may be located at different levels. For
example, the peak at the middle position is located at a higher
level, and the peak at the lateral side is located at a lower
level.
[0027] As shown in FIGS. 1 and 4, the cellular unit 16 may be a
hexagonal column structure, and at least two structure surfaces are
selected from multiple structure surfaces of each cellular unit,
and each of the selected structure surfaces is formed with an
opening 18. In other words, the cellular unit 16 may have two
openings 18 extending in two different directions. In detail, the
neighboring cellular units 16 may communicate with one another
through the openings 18 formed on the structure surfaces.
[0028] As shown in FIG. 5, the cellular unit 16 of the invention
may be formed with four openings 18 extending in different
directions. The neighboring and connected cellular units 16 may
communicate with one another through the openings 18. However, the
number of the openings 18 is not particularly restricted thereto,
and may be adjusted according to the actual requirements without
affecting the structural strength. In other words, the numbers of
the openings 18 formed in different cellular units 16 may be the
same as or different from one another.
[0029] As shown in FIG. 4 or 5, after the flowing air streams
contact the heat dissipating body 14, a portion of the air streams
contacts with the external surface of the heat dissipating body 14
and takes the surface heat away, and the other portion of the air
streams may enter the heat dissipating body 14 from the opening 18
on the windward surface, and the air streams flow into other
cellular units 16 through other openings 18. It is to be noted that
the pattern and direction of the arrow represent the schematic
flowing direction of the flowing air stream, but does not intend to
restrict the substantial flowing direction of the air stream.
[0030] According to FIGS. 4 and 5, it is obtained that the air
streams, after entering the heat dissipating body 14, can flow in
different directions and continuously contact the structure surface
(heat dissipating surface) of each cellular unit 16. Therefore, the
air streams flowing out of the heat dissipating body 14 can
concurrently take away a portion of heat of each cellular unit 16,
so that the temperature of each cellular unit 16 is decreased and
the good dissipation effect is obtained.
[0031] On the other hand, as the number of the openings 18 gets
more, the selectivity of the air flow directions gets more and the
flowing path gets longer. Thus, the time, during which the air is
left in the heat dissipating body 14, is lengthened, and the air
streams contact each cellular unit 16 with the longer time and the
higher possibility. Thus, the air streams, flowing out of the heat
dissipating body 14, can take more heat away, so that the heat
dissipating body 14 has the better dissipation effect.
[0032] In addition, the more structure surfaces of the cellular
unit 16 represent that the heat dissipating body 14 may have more
surfaces serving as the windward surfaces. Thus, the air streams
flowing in different directions may enter the heat dissipating body
14 more easily.
[0033] As shown in FIGS. 2 and 3, the top edge of the heat
dissipating body 14 of the invention has the arced or wavy shape,
so the air streams, flowing along the top edge of the heat
dissipating body 14, can satisfy the streamline movement track, and
can thus take away the heat of the heat dissipating body 14 more
smoothly.
[0034] In the example of FIG. 6 showing the cellular unit 16
constituted by the hexagonal columns, two opposite structure
surfaces may be selected, and each of the selected structure
surfaces is formed with an opening 18, so that the two openings 18
are disposed opposite each other, and the overall heat dissipating
body 14 is formed with a through channel, through which the air
streams flow.
[0035] As shown in FIG. 7, at least one of the two openings 18 of
each cellular unit 16 is selected, and the structure surfaces on
two sides of the selected opening 18 are defined as cell walls 36.
The wall edge of one of the cell walls 36 is formed into an arced
wall edge 38. Consequently, the opening 18 has a bottom gap and a
top gap larger than the bottom gap.
[0036] As shown in FIG. 8, another example of the invention is
disclosed, wherein a heat dissipating body 14 is formed on the base
12, and the heat dissipating body 14 is composed of a plurality of
cellular units 16 having quadrilateral column structures. In
addition, each structure surface of the cellular unit 16 is formed
with an opening 18 so that the air streams can flow through
multiple channels of the heat dissipating body 14, and the air
streams, after entering the heat dissipating body 14, can flow in
many directions to enhance the dissipation effect.
[0037] As shown in FIG. 9, the heat sink of the invention may be
applied to an outdoor opto-electronic apparatus, such as a LED road
lamp 20. Thus, the base 12 may be an upper lamp shell 22 of the LED
road lamp 20, and the heat dissipating body 14 and the upper lamp
shell 22 are integrally formed.
[0038] While the present invention has been described by way of
examples and in terms of preferred embodiments, it is to be
understood that the present invention is not limited thereto. To
the contrary, it is intended to cover various modifications.
Therefore, the scope of the appended claims should be accorded the
broadest interpretation so as to encompass all such
modifications.
* * * * *