US20130206369A1 - Heat dissipating device - Google Patents
Heat dissipating device Download PDFInfo
- Publication number
- US20130206369A1 US20130206369A1 US13/371,480 US201213371480A US2013206369A1 US 20130206369 A1 US20130206369 A1 US 20130206369A1 US 201213371480 A US201213371480 A US 201213371480A US 2013206369 A1 US2013206369 A1 US 2013206369A1
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- United States
- Prior art keywords
- heat dissipating
- vapor
- dissipating device
- chamber
- capillary structure
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
- F28D15/043—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure forming loops, e.g. capillary pumped loops
Abstract
A heat dissipating device includes a chamber body, a heat sink, a pipe, a first capillary structure and N vapor channels. The chamber body has an evaporation chamber and a compensation chamber, wherein the evaporation chamber has a vapor outlet and the compensation chamber has a liquid inlet. The heat sink is disposed on an outer wall of a first side of the chamber body and at least covers the compensation chamber. The pipe is installed within the heat sink, wherein a first end of the pipe is connected to the vapor outlet and a second end of the pipe is connected to the liquid inlet. The first capillary structure is formed in the evaporation chamber. The N vapor channels are formed in the first capillary structure. The N vapor channels and the compensation chamber are isolated by the first capillary structure.
Description
- 1. Field of the Invention
- The invention relates to a heat dissipating device and, more particularly, to a loop-heat-pipe type heat dissipating device.
- 2. Description of the Prior Art
- Heat dissipating device is a significant component for electronic products. When an electronic product is operating, the current in circuit will generate unnecessary heat due to impedance. If the heat is accumulated in the electronic components of the electronic product without dissipating immediately, the electronic components may get damage due to the accumulated heat. Therefore, the performance of heat dissipating device is a significant issue for the electronic product.
- So far the heat dissipating device used in the electronic product usually consists of a heat pipe, a heat dissipating fin and a heat dissipating fan, wherein one end of the heat pipe contacts the electronic component, which generates heat during operation, the other end of the heat pipe is connected to the heat dissipating fin, and the heat dissipating fan blows air to the heat dissipating fin so as to dissipate heat. However, since heat generated by the electronic component increases per unit time while calculation speed of the electronic component increase, the conventional heat dissipating device cannot dissipate heat effectively form the electronic component such that heat will be accumulated in the electronic component accordingly. Therefore, how to dissipate heat from the electronic component much more rapidly becomes a significant issue while designing the heat dissipating device.
- The invention provides a heat dissipating device for solving the aforesaid problems.
- According to an embodiment of the invention, a heat dissipating device comprises a chamber body, a heat sink, a pipe, a first capillary structure and N vapor channels, wherein N is a positive integer. The chamber body has an evaporation chamber and a compensation chamber, wherein the evaporation chamber has a vapor outlet and the compensation chamber has a liquid inlet. The heat sink is disposed on an outer wall of a first side of the chamber body and at least covers the compensation chamber. The pipe is installed within the heat sink, wherein a first end of the pipe is connected to the vapor outlet and a second end of the pipe is connected to the liquid inlet. The first capillary structure is formed in the evaporation chamber. The N vapor channels are formed in the first capillary structure. The N vapor channels and the compensation chamber are isolated by the first capillary structure.
- In this embodiment, the heat dissipating device may further comprise a vapor collecting space formed in the evaporation chamber and communicating with the N vapor channels and the vapor outlet.
- As mentioned in the above, the heat sink of the invention is disposed on the outer wall of the chamber body and at least covers the compensation chamber and the pipe of the invention is installed within the heat sink, such that the heat sink not only can cool vapor within the pipe but also can absorb heat leak within the compensation chamber so as to enhance heat dissipating efficiency of the heat dissipating device. Furthermore, sine the vapor channels and the compensation chamber are isolated by the capillary structure, the vapor generated in the vapor channels cannot flow back to the compensation chamber. Accordingly, pressure difference between the evaporation chamber and the compensation chamber can be maintained so as to prevent the heat dissipating device from failing due to reduced pressure difference. Moreover, the invention utilizes the vapor collecting space to communicate with the vapor channels and the vapor outlet such that vapor generated in all vapor channels can flow into the pipe from the vapor outlet through the vapor collecting space. Accordingly, heat dissipating efficiency of the heat dissipating device can be enhanced effectively.
- These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
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FIG. 1 is a perspective view illustrating a heat dissipating device according to an embodiment of the invention. -
FIG. 2A is a top view illustrating the heat dissipating device shown inFIG. 1 . -
FIG. 2B is cross-sectional view illustrating the heat dissipating device along X-X line shown inFIG. 2A . -
FIG. 2C is a cross-sectional view illustrating the heat dissipating device along Y-Y line shown inFIG. 2A . -
FIG. 3 is an assembly view illustrating the chamber body and the first capillary structure shown inFIG. 2B from different view angles. -
FIG. 4 is a cross-sectional view illustrating a heat dissipating device according to another embodiment of the invention. -
FIG. 5 is a cross-sectional view illustrating a heat dissipating device according to another embodiment of the invention. -
FIG. 6 is a cross-sectional view illustrating a heat dissipating device according to another embodiment of the invention. -
FIG. 7 is a cross-sectional view illustrating a heat dissipating device according to another embodiment of the invention. -
FIG. 8 is a cross-sectional view illustrating a heat dissipating device according to another embodiment of the invention. -
FIG. 9 is a cross-sectional view illustrating a heat dissipating device according to another embodiment of the invention. - Referring to
FIGS. 1 to 3 ,FIG. 1 is a perspective view illustrating a heat dissipating device 1 according to an embodiment of the invention,FIG. 2A is a top view illustrating the heat dissipating device 1 shown inFIG. 1 ,FIG. 2B is cross-sectional view illustrating the heat dissipating device 1 along X-X line shown inFIG. 2A ,FIG. 2C is a cross-sectional view illustrating the heat dissipating device 1 along Y-Y line shown inFIG. 2A , andFIG. 3 is an assembly view illustrating thechamber body 10 and the firstcapillary structure 16 shown inFIG. 2B from different view angles. - As shown in
FIGS. 1 to 3 , theheat dissipating device 3 comprises achamber body 10, aheat sink 12, apipe 14, a firstcapillary structure 16,N vapor channels 18 and avapor collecting space 20, wherein N is a positive integer. Thechamber body 10 has anevaporation chamber 100 and acompensation chamber 102, wherein theevaporation chamber 100 has avapor outlet 104 and thecompensation chamber 102 has aliquid inlet 106. Theheat sink 12 is disposed on anouter wall 108 of a first side S1 of thechamber body 10 and at least covers thecompensation chamber 102. In this embodiment, theheat sink 12 covers thecompensation chamber 102 and theevaporation chamber 100 at the same time. In another embodiment, theheat sink 12 may only cover thecompensation chamber 102. Theheat sink 12 and thecompensation chamber 102 maybe served as a vapor chamber as long as theheat sink 12 covers thecompensation chamber 102. Accordingly, theheat sink 12 can absorb heat leak within thecompensation chamber 102 so as to enhance heat dissipating efficiency of the heat dissipating device 1. Theheat sink 12 may comprise a plurality of heat dissipating fins 120. In practical applications, a working fluid (not shown), such as water or other fluids with low viscosity, is filled in thechamber body 10. - The
pipe 14 is installed within theheat sink 12 such that theheat sink 12 can cool vapor within thepipe 14. Afirst end 140 of thepipe 14 is connected to thevapor outlet 104 of theevaporation chamber 100 and asecond end 142 of thepipe 14 is connected to theliquid inlet 106 of thecompensation chamber 102. Accordingly, when the working fluid is evaporated by heat to be transformed into vapor, the vapor can flow into thepipe 14 from thevapor outlet 104. Then, the vapor is cooled by theheat sink 12 to be transformed into liquid and the liquid flows into thecompensation chamber 102 of thechamber body 10 from theliquid inlet 106. Since thepipe 14 and thechamber body 10 are configured in a loop type, the heat dissipating device 1 may be called as loop-heat-pipe type heat dissipating device. In this embodiment, a pipe diameter D1 of thefirst end 140 is larger than a pipe diameter D2 of the second end 142 (as shown inFIG. 2A ) so as to ensure that a pressure difference at thefirst end 140 is smaller than a pressure difference at thesecond end 142. Accordingly, the vapor and liquid can circulate in thechamber body 10 well. - The
first capillary structure 16 and thevapor collecting space 20 are formed in theevaporation chamber 100. TheN vapor channels 18 are formed in thefirst capillary structure 16. In this embodiment, there are twelvevapor channels 18 formed in the first capillary structure 16 (i.e. N=12), arranged in equal distance and close to aninner wall 110 of a second side S2 of thechamber body 10, wherein the second side S2 is opposite to the aforesaid first side S1. As shown inFIGS. 2B and 2C , aheat source 3 is attached on anouter wall 112 of the second side S2 of thechamber body 10. In other words, thevapor channels 18 of the invention are close to theheat source 3. Thermal resistance is lower while thevapor channels 18 are closer to theheat source 3. Accordingly, the liquid within thefirst capillary structure 16 can be evaporated by heat rapidly and then be transformed into vapor in thevapor channels 18 so as to enhance heat dissipating efficiency. It should be noted that the number and arrangement of the vapor channels can be determined based on practical applications and are not limited to the embodiment shown in the figures. - As shown
FIGS. 2B and 3 , all of thevapor channels 18 and thecompensation chamber 102 are isolate by thefirst capillary structure 16. That is to say, each of thevapor channels 18 does not communicate with thecompensation chamber 102 such that the vapor generated in each of thevapor channels 18 cannot flow back to thecompensation chamber 102. Accordingly, pressure difference between theevaporation chamber 100 and thecompensation chamber 102 can be maintained so as to prevent the heat dissipating device 1 from failing due to reduced pressure difference between theevaporation chamber 100 and thecompensation chamber 102. Furthermore, thevapor collecting space 20 communicates with all of thevapor channels 18 and thevapor outlet 104 such that the vapor generated in each of thevapor channels 18 can flow into thepipe 14 from thevapor outlet 104 through thevapor collecting space 20, so as to enhance heat dissipating efficiency of the heat dissipating device 1. - In this embodiment, a cross-section of each of the
vapor channels 18 is circular, as shown inFIG. 2C . In another embodiment, a cross-section of each of thevapor channels 18 may be rectangular, polygonal or arc-shaped. - Referring to
FIG. 4 along withFIG. 2C ,FIG. 4 is a cross-sectional view illustrating a heat dissipating device 1′ according to another embodiment of the invention. The difference between the heat dissipating device 1′ and the aforesaid heat dissipating device 1 is that M of theN vapor channels 18 of the heat dissipating device 1′ are located on theinner wall 110 of the second side S2 of the chamber body 10 (i.e. N=12 and M=N). Furthermore, a cross-section of each of thevapor channels 18 is half-circular. Since thevapor channels 18 are located on theinner wall 110 of the second side S2 of thechamber body 10, the liquid within thefirst capillary structure 16 can be evaporated by heat rapidly and then be transformed into vapor in thevapor channels 18 so as to enhance heat dissipating efficiency. It should be noted that the same elements inFIG. 4 andFIG. 2C are represented by the same numerals, so the repeated explanation will not be depicted herein again. - Referring to
FIG. 5 along withFIG. 2C ,FIG. 5 is a cross-sectional view illustrating a heat dissipating device 1″ according to another embodiment of the invention. The difference between the heat dissipating device 1″ and the aforesaid heat dissipating device 1 is that M of theN vapor channels 18 of the heat dissipating device 1′ are located on theinner wall 110 of the second side S2 of thechamber body 10 and P of theN vapor channels 18 are located on theinner wall 114 of the first side S1, wherein P is a positive integer and a sum of P and M is smaller than or equal to N. In this embodiment, twelve of twenty-fourvapor channels 18 are located on theinner wall 110 of the second side S2 of thechamber body 10 and the other twelve of twenty-fourvapor channels 18 are located on theinner wall 114 of the first side S1 (i.e. N=24 and P+M=N). Furthermore, a cross-section of each of thevapor channels 18 is rectangular. Since each of thevapor channels 18 is rectangular, the pressure difference of thevapor channel 18 can be reduced so as to enhance heat dissipating efficiency. Moreover, thevapor channels 18 on opposite sides may be arranged symmetrically or interlacedly and it depends on practical applications. It should be noted that the same elements inFIG. 5 andFIG. 2C are represented by the same numerals, so the repeated explanation will not be depicted herein again. - Referring to
FIG. 6 along withFIG. 2C ,FIG. 6 is a cross-sectional view illustrating a heat dissipating device 1′″ according to another embodiment of the invention. The difference between the heat dissipating device 1′″ and the aforesaid heat dissipating device 1 is that M of theN vapor channels 18 of the heat dissipating device 1′″ are located on theinner wall 110 of the second side S2 of thechamber body 10, P of theN vapor channels 18 are located on theinner wall 114 of the first side S1, and Q of theN vapor channels 18 are located between theM vapor channels 18 and theP vapor channels 18, wherein Q is a positive integer and a sum of Q, P and M is equal to N. In this embodiment, twelve of thirty-fivevapor channels 18 are located on theinner wall 110 of the second side S2 of thechamber body 10, twelve of thirty-fivevapor channels 18 are located on theinner wall 114 of the first side S1, and the other eleven of thirty-fivevapor channels 18 are located between the twenty-fourvapor channels 18 on opposite sides (i.e. N=35 and Q+P+M=N). Furthermore, a cross-section of each of thevapor channels 18 is rectangular. It should be noted that the same elements inFIG. 6 andFIG. 2C are represented by the same numerals, so the repeated explanation will not be depicted herein again. - Referring to
FIG. 7 along withFIG. 2B ,FIG. 7 is a cross-sectional view illustrating aheat dissipating device 5 according to another embodiment of the invention. The difference between theheat dissipating device 5 and the aforesaid heat dissipating device 1 is that theheat dissipating device 5 further comprises asecond capillary structure 50 formed in thecompensation chamber 102 and located on theinner wall 110 of the second side S2 of thechamber body 10. Once heat leak is generated in thecompensation chamber 102, the liquid within thesecond capillary structure 50 will be evaporated by heat and then be transformed into vapor. Consequently, heat leak generated in thecompensation chamber 102 can be dissipated by theheat sink 102 outside of thecompensation chamber 102 so as to enhance heat dissipating efficiency. It should be noted that the same elements inFIG. 7 andFIG. 2B are represented by the same numerals, so the repeated explanation will not be depicted herein again. - Referring to
FIG. 8 along withFIG. 7 ,FIG. 8 is a cross-sectional view illustrating aheat dissipating device 5′ according to another embodiment of the invention. The difference between theheat dissipating device 5′ and the aforesaidheat dissipating device 5 is that theheat dissipating device 5′ further comprises athird capillary structure 52 and a plurality ofsupport pillars 54. Thethird capillary structure 52 is formed in thecompensation chamber 102 and located on theinner wall 114 of the first side S1. Thesupport pillars 54 are formed in thecompensation chamber 102 and connect thesecond capillary structure 50 and thethird capillary structure 52. Thesupport pillars 54 can prevent thecompensation chamber 102 from cracking due to compression. In this embodiment, after theheat sink 12 outside of thecompensation chamber 102 takes heat away, the vapor will be congealed to form glob on thethird capillary structure 52 and then the glob will flow to thesecond capillary structure 50 along thesupport pillars 54 so as to accelerate the cycle of vapor and liquid within thecompensation chamber 102. Accordingly, heat dissipating efficiency can be enhanced. It should be noted that the same elements inFIG. 8 andFIG. 7 are represented by the same numerals, so the repeated explanation will not be depicted herein again. - Referring to
FIG. 9 along withFIG. 8 ,FIG. 9 is a cross-sectional view illustrating aheat dissipating device 5″ according to another embodiment of the invention. The difference between theheat dissipating device 5″ and the aforesaidheat dissipating device 5′ is that theheat dissipating device 5″ further comprises a plurality of fourthcapillary structures 56. Each of the fourthcapillary structures 56 is formed around one of thesupport pillars 54 and connects thesecond capillary structure 50 and thethird capillary structure 52. In this embodiment, after theheat sink 12 outside of thecompensation chamber 102 takes heat away, the vapor will be congealed to form glob on thethird capillary structure 52 and then the glob will flow to thesecond capillary structure 50 along the fourthcapillary structures 56 so as to accelerate the cycle of vapor and liquid within thecompensation chamber 102. Accordingly, heat dissipating efficiency can be enhanced. It should be noted that the same elements inFIG. 9 andFIG. 8 are represented by the same numerals, so the repeated explanation will not be depicted herein again. - It should be noted that the aforesaid
first capillary structure 16,second capillary structure 50,third capillary structure 52 and fourthcapillary structures 56 may be formed by, but not limited to, a metal powder sintering process. It depends on practical applications. - Compared with the prior art, the heat sink of the invention is disposed on the outer wall of the chamber body and at least covers the compensation chamber and the pipe of the invention is installed within the heat sink, such that the heat sink not only can cool vapor within the pipe but also can absorb heat leak within the compensation chamber so as to enhance heat dissipating efficiency of the heat dissipating device. Furthermore, sine the vapor channels and the compensation chamber are isolated by the capillary structure, the vapor generated in the vapor channels cannot flow back to the compensation chamber. Accordingly, pressure difference between the evaporation chamber and the compensation chamber can be maintained so as to prevent the heat dissipating device from failing due to reduced pressure difference. Moreover, the invention utilizes the vapor collecting space to communicate with the vapor channels and the vapor outlet such that vapor generated in all vapor channels can flow into the pipe from the vapor outlet through the vapor collecting space. Accordingly, heat dissipating efficiency of the heat dissipating device can be enhanced effectively. Still further, the invention may form capillary structures in the compensation chamber so as to accelerate the cycle of vapor and liquid within the compensation chamber. Accordingly, heat dissipating efficiency can be enhanced.
- Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
Claims (11)
1. A heat dissipating device comprising:
a chamber body having an evaporation chamber and a compensation chamber, the evaporation chamber having a vapor outlet, the compensation chamber having a liquid inlet;
a heat sink disposed on an outer wall of a first side of the chamber body and at least covering the compensation chamber;
a pipe installed within the heat sink, a first end of the pipe being connected to the vapor outlet, a second end of the pipe being connected to the liquid inlet;
a first capillary structure formed in the evaporation chamber; and
N vapor channels formed in the first capillary structure, the N vapor channels and the compensation chamber being isolated by the first capillary structure, N being a positive integer.
2. The heat dissipating device of claim 1 further comprising a vapor collecting space formed in the evaporation chamber and communicating with the N vapor channels and the vapor outlet.
3. The heat dissipating device of claim 1 , wherein M of the N vapor channels are located on an inner wall of a second side of the chamber body, M is a positive integer smaller than or equal to N, and the second side is opposite to the first side.
4. The heat dissipating device of claim 3 , wherein P of the N vapor channels are located on an inner wall of the first side, P is a positive integer, and a sum of P and M is smaller than or equal to N.
5. The heat dissipating device of claim 4 , wherein Q of the N vapor channels are located between the M vapor channels and the P vapor channels, Q is a positive integer, and a sum of Q, P and M is equal to N.
6. The heat dissipating device of claim 1 , wherein a cross-section of each of the N vapor channels is rectangular, polygonal, circular or arc-shaped.
7. The heat dissipating device of claim 1 further comprising a second capillary structure formed in the compensation chamber and located on an inner wall of a second side of the chamber body, wherein the second side is opposite to the first side.
8. The heat dissipating device of claim 7 further comprising:
a third capillary structure formed in the compensation chamber and located on an inner wall of the first side; and
a plurality of support pillars formed in the compensation chamber and connecting the second capillary structure and the third capillary structure.
9. The heat dissipating device of claim 8 further comprising a plurality of fourth capillary structures, each of the fourth capillary structures being formed around one of the support pillars and connecting the second capillary structure and the third capillary structure.
10. The heat dissipating device of claim 1 , wherein a pipe diameter of the first end is larger than a pipe diameter of the second end.
11. The heat dissipating device of claim 1 , wherein the heat sink comprises a plurality of heat dissipating fins.
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US13/371,480 US20130206369A1 (en) | 2012-02-13 | 2012-02-13 | Heat dissipating device |
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US13/371,480 US20130206369A1 (en) | 2012-02-13 | 2012-02-13 | Heat dissipating device |
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US13/371,480 Abandoned US20130206369A1 (en) | 2012-02-13 | 2012-02-13 | Heat dissipating device |
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US20180066895A1 (en) * | 2015-09-16 | 2018-03-08 | Acer Incorporated | Thermal dissipation module |
US20190239391A1 (en) * | 2018-01-26 | 2019-08-01 | Htc Corporation | Heat transferring module |
US20200029466A1 (en) * | 2018-07-18 | 2020-01-23 | Ling Long | Liquid-heat-transmission device |
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