HEAT SINK, LIQUID COOLING UNIT, AND ELECTRONIC APPARATUS
A heat sink for absorbing heat which is generated by an electronic module by a coolant which flows through its internal portion, provided with a first heat sink part which is contiguous with the electronic module, a second heat sink part which is contiguous with the electronic module, and a heat discharger which is arranged spaced from the first heat sink part and second heat sink part at an opposite side from the electronic module and which is arranged in a flow path between the first heat sink part and second heat sink part.
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This application claims priority of Japan Patent Application Number 2010-196526, filed on Sep. 2, 2010.
FIELDThe present invention relates to a heat sink for absorbing heat which is generated by an electronic module and a liquid cooling unit and an electronic apparatus which are provided with a heat sink.
BACKGROUNDNotebook personal computers and other electronic apparatuses have printed circuit boards installed therein. On the printed circuit boards, for example, LSI (large scale integrated circuit) chips and other electronic modules are mounted. In order to absorb heat which is generated by these electronic modules, a liquid cooling unit provided with a heat sink is disposed on the printed circuit board.
As related art, Japanese Laid-Open Patent Publication No. 2005-229033 is known.
When providing a liquid cooling unit at a notebook personal computer or other electronic apparatus, due to the design of the internal layout of the electronic apparatus, the space where the liquid cooling unit can be provided is sometimes limited. In general, as the area of the heat sink of the liquid cooling unit becomes smaller, the liquid cooling unit falls in cooling efficiency. Therefore, when the area of the part where the heat sink can be provided is limited, it is not possible to sufficiently raise the cooling efficiency of the liquid cooling unit.
SUMMARYAccordingly, it is an object of the embodiment to provide a heat sink which improves the cooling efficiency over the related art, when the area of the part where the heat sink of the liquid cooling unit can be provided is limited.
According to a first aspect, there is provided a heat sink for absorbing heat which is generated by an electronic module by a coolant which flows through its internal portion, comprising a first heat sink part which is contiguous with the electronic module, a second heat sink part which is contiguous with the electronic module, and a heat discharger which is arranged spaced from the first heat sink part and second heat sink part at an opposite side from the electronic module and which is arranged in a flow path between the first heat sink part and second heat sink part.
Further, according to a second aspect, there is provided a liquid cooling unit which is provided with the above heat sink.
Furthermore, according to a third aspect, there is provided an electronic apparatus which is provided with the above heat sink.
According to the heat sink of the disclosure, by provision of a heat discharger, the cooling efficiency can be improved to more than that of the related art.
(1) First EmbodimentFirst, with reference to
The housing body 20 is provided with a base 22 and a cover 24. The cover 24 can be detached from the base 22. Further, on the surface of the cover 24, a keyboard 26, a pointing device 28, and other input devices are disposed.
The display use housing 30 is provided with a liquid crystal panel module 32. The liquid crystal panel module 32 displays text, graphics, etc.
Next, with reference to
The printed circuit board unit 40 is provided with a printed circuit board 42 and an electronic module 44. The electronic module 44 is mounted on, the surface of the printed circuit board 42. The electronic module 44 is for example an LSI circuit. On the LSI circuit or other electronic module 44, for example, a CPU (central processing unit) chip is mounted. The CPU chip executes predetermined processing based on an operating system and application programs. When the CPU chip executes the processing, the LSI circuit or other electronic module 44 generates heat.
In order to absorb the heat generated by the electronic module 44, a liquid cooling unit 100 is attached to the printed circuit board unit 40. The detailed configuration of the liquid cooling unit 100 will be explained later.
The DVD drive device 46 reads data from a DVD or other recording medium and writes data to the DVD or other recording medium. The hard disk drive device 48 stores for example the operating system and application software explained above.
Further, the card unit 50 is mounted on the printed circuit board 42. Into the card unit 50, for example, a memory card or LAN (local area network) card is inserted.
Here, with reference to
The heat exchanger 110 takes the heat from the coolant which flows into the heat exchanger 110. The heat exchanger 110 is disposed in the vicinity of an exhaust port 52 (see
The fan unit 120 is provided with a fan housing 122 and a fan 126. On the bottom plate and top plate of the fan housing 122, an air intake opening 124 is formed. The air intake opening 124 connects the internal space of the fan housing 122 and the outside space of the fan housing 122.
The tank 130 is disposed downstream of the heat exchanger 110. The tank 130 stores the coolant stripped of heat by the heat exchanger 110.
The pump 140 is disposed downstream of the tank 130. The pump 140 discharges the coolant stored in the tank 130 to generate the flow of the coolant which flows over the circulation route. The pump 140 is for example a piezoelectric pump.
The heat sink 150 is disposed downstream of the pump 140. As illustrated in
The heat exchanger 110 explained above is located downstream of the heat sink 150. In the liquid cooling unit 100, a circulation route as explained above is formed.
Next, the structure of the heat sink 150 of the first embodiment will be explained in detail with reference to
As illustrated in
At the two ends of the first heat sink part 152, flow pipes 170 and 172 are provided. Further, at the two ends of the second heat sink part 154, flow pipes 174 and 176 are provided. Further, the flow pipes 172 and 174 are connected by the heat discharger 156.
Here, referring to
The heat discharger 156 is arranged spaced from the first heat sink part 152 and the second heat sink part 154, at the opposite side from the electronic module 44. Further, the heat discharger 156 is arranged in the flow path between the first heat sink part 152 and the second heat sink part 154. For this reason, as illustrated by the arrows in
Here, the action of the heat which is generated by the electronic module 44 being absorbed by the heat sink 150 of the first embodiment will be explained. First, the coolant, which flows into the heat sink 150, passes through the flow pipe 170 and flows through the first heat sink part 152. Part of the heat which is generated by the electronic module 44 is conducted to the housing of the first heat sink part 152 and the fins 158 and is absorbed by the coolant which flows through the first heat sink part 152. Therefore, the temperature of the coolant which flows through the first heat sink part 152 rises. The coolant, which flows through the first heat sink part 152 and rises in temperature, passes through the flow pipe 172 and flows through the heat discharger 156. The heat discharger 156 is arranged spaced from the first heat sink part 152 and second heat sink part 154, so the temperature of the coolant which flows through the heat discharger 156 falls. The coolant, which flows through the heat discharger 156 and falls in temperature, passes through the flow pipe 174 and flows through the second heat sink part 154. Part of the heat which is generated by the electronic module 44 is conducted to the housing of the second heat sink part 154 and the fins 158 and is absorbed by the coolant which flows through the second heat sink part 154. The coolant which flows through the second heat sink part 154 passes through the flow pipe 176 and flows out to the outside of the heat sink 150.
Therefore, according to the heat sink 150 of the first embodiment, since the coolant which was lowered in temperature by flowing through the heat discharger 156 flows through the second heat sink part 154, the cooling efficiency of the heat sink 150 can be improved. Further, the heat discharger 156 of the first embodiment is arranged spaced from the first heat sink 152 and second heat sink 154 at an opposite side from the electronic module 44, so even when the area of the part where the heat sink 150 can be provided is limited when viewed from a plane, the cooling efficiency of the heat sink 150 can be improved.
Note that, inside of the housing body 20 which was explained with reference to
Further, the larger the area of the heat discharger 156, the more improved the cooling efficiency of the coolant which flows through the heat discharger 156. Therefore, like in the example illustrated in
Note that in the above embodiment, the example was explained of the heat sink 150 being provided with a single heat discharger 156, but the heat sink 150 may also be provided with a plurality of heat dischargers 156. Here, referring to
When, as in the example which is illustrated in
Next, a second embodiment will be explained. The second embodiment differs in the configuration of the heat sink 150 from that of the first embodiment. The rest of the configuration is similar to that of the first embodiment, so an explanation will be omitted. Below, the configuration of the heat sink 150 of the second embodiment will be explained with reference to
As illustrated in
In the example illustrated in
Further, by providing the heat discharger 156 so that the surface with the largest area in the surfaces of the heat discharger 156 is slanted with respect to the surface with the largest area in the surfaces of the first heat sink part 152, the flow of air through the inside of the housing body 20 touches the surface of the heat discharger 156 more efficiently than the first embodiment. Therefore, the cooling efficiency of the coolant which flows through the heat discharger 156 is improved.
(3) Third EmbodimentNext, a third embodiment will be explained. The third embodiment differs in the configuration of the heat sink 150 from that of the first embodiment. The rest of the configuration is similar to that of the first embodiment, so an explanation will be omitted. Below, the configuration of the heat sink 150 of the third embodiment will be explained with reference to
As illustrated in
In the third embodiment, the heat generated by the electronic module 44 is conducted to both the housings and fins 160 forming the first heat sink part 152 and the second heat sink part 154. In addition to the effects of the above embodiments, heat is discharged from the fins 160 as well. Therefore, according to the third embodiment, the cooling efficiency of the heat sink 150 can be further improved.
(4) Fourth EmbodimentNext, a fourth embodiment will be explained. The fourth embodiment differs in the configuration of the heat sink 150 from that of the first embodiment. The rest of the configuration is similar to that of the first embodiment, so an explanation will be omitted. Below, the configuration of the heat sink 150 of the fourth embodiment will be explained with reference to
As illustrated in
At the two ends of the first heat sink part 152, flow pipes 180 and 182 are provided. Further, at the two ends of the second heat sink part 154, flow pipes 184 and 188 are provided. Further, at the two ends of the third heat sink part 162, flow pipes 186 and 188 are provided. Further, the flow pipes 182 and 184 are connected by the heat discharger 156. Further, the flow pipes 182 and 186 are connected by the additional heat discharger 164.
The structure of the interior part of the third heat sink part 162 is similar to the structure of the interior part of the first heat sink part 152 explained in the above first embodiment. Further, the structure of the interior part of the additional heat discharger 164 is similar to the structure of the interior part of the heat discharger 156 explained in the above first embodiment.
In the same way as the above embodiments, the heat discharger 156 is arranged spaced from the first heat sink part 152 and the second heat sink part 154 at the opposite side from the electronic module 44. The additional heat discharger 164 is arranged spaced from the first heat sink part 152 and third heat sink part 162 at the opposite side from the electronic module 44.
Further, in the same way as the above embodiments, the heat discharger 156 is arranged in the flow path between the first heat sink part 152 and the second heat sink part 154. The additional heat discharger 164 is arranged in the flow path between the first heat sink part 152 and the third heat sink part 162.
Therefore, as illustrated by the arrows in
In the fourth embodiment, the coolant which flows through the first heat sink part 152 is cooled by flowing into both the heat discharger 156 and the additional heat discharger 164, so the cooling efficiency of the heat sink 150 can be further improved.
A detailed explanation was given above on the heat sink, liquid cooling unit, and electronic apparatus of the present invention, but the present invention is not limited to the above-described embodiments. Further, the embodiments explained above may be suitably combined. Further, various modifications and alterations may be made within the scope of the present invention.
All examples and conditional language recited therein are intended for pedagogical purpose to aid the reader in understanding the invention.
Claims
1. A heat sink for absorbing heat generated by an electronic module by a coolant flowing through its internal portion, comprising:
- a first heat sink part which is contiguous with said electronic module;
- a second heat sink part which is contiguous with said electronic module; and
- a heat discharger which is arranged spaced from the first heat sink part and second heat sink part at an opposite side from said electronic module and which is arranged in a flow path between the first heat sink part and second heat sink part.
2. The heat sink according to claim 1, comprising a plurality of said heat dischargers.
3. The heat sink according to claim 1, wherein the surface with the largest area in the surfaces of the heat discharger is slanted with respect to the surface with the largest area in the surfaces of said first heat sink part.
4. The heat sink according to claim 1, further comprising fins between said first heat sink part and said heat discharger and/or between said second heat sink part and said heat discharger.
5. The heat sink according to claim 1, further comprising
- a third heat sink part which is arranged aligned with said first heat sink part and second heat sink part and which is contiguous with said electronic module and
- an additional heat discharger which is arranged spaced apart from said first heat sink part and said third heat sink part at an opposite side from said electronic module and which is arranged in a flow path between the first heat sink part and third heat sink part.
6. A liquid cooling unit comprising
- a heat sink for absorbing heat which is generated by an electronic module by a coolant flowing through its internal portion,
- a heat exchanger of the coolant, and
- a pump which circulates said coolant, wherein
- said heat sink comprising
- a first heat sink part which is contiguous with said electronic module,
- a second heat sink part which is contiguous with said electronic module, and
- a heat discharger which is arranged spaced from the first heat sink part and second heat sink part at an opposite side from said electronic module and which is arranged in a flow path between the first heat sink part and second heat sink part.
7. An electronic apparatus comprising
- an electronic module which generates heat,
- a heat sink for absorbing heat which is generated by said electronic module by a coolant which flows through its internal portion, and
- a pump which circulates said coolant, wherein
- said heat sink is comprised of
- a first heat sink part which is contiguous with said electronic module,
- a second heat sink part which is contiguous with said electronic module, and
- a heat discharger which is arranged spaced from the first heat sink part and second heat sink part at an opposite side from said electronic module and which is arranged in a flow path between the first heat sink part and second heat sink part.
Type: Application
Filed: Aug 5, 2011
Publication Date: Mar 8, 2012
Applicant: FUJITSU LIMITED (Kawasaki-shi)
Inventors: Michimasa Aoki (Kawasaki), Masumi Suzuki (Kawasaki), Yosuke Tsunoda (Kawasaki), Masaru Sugie (Kawasaki), Shinichirou Kouno (Kawasaki), Hiroshi Muto (Sagamihara), Kenji Katsumata (Kawasaki)
Application Number: 13/198,899
International Classification: F28F 13/00 (20060101); F28F 7/00 (20060101);