US20080223552A1 - Liquid cooling system - Google Patents
Liquid cooling system Download PDFInfo
- Publication number
- US20080223552A1 US20080223552A1 US12/046,187 US4618708A US2008223552A1 US 20080223552 A1 US20080223552 A1 US 20080223552A1 US 4618708 A US4618708 A US 4618708A US 2008223552 A1 US2008223552 A1 US 2008223552A1
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- US
- United States
- Prior art keywords
- heat
- flow passage
- radiating sheet
- liquid cooling
- cooling system
- Prior art date
- 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.)
- Abandoned
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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
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
- F28D1/0308—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other
- F28D1/0325—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another
- F28D1/0333—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another the plates having integrated connecting members
- F28D1/0341—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another the plates having integrated connecting members with U-flow or serpentine-flow inside the conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/12—Elements constructed in the shape of a hollow panel, e.g. with channels
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/20—Cooling means
- G06F1/203—Cooling means for portable computers, e.g. for laptops
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
- H01L23/473—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing liquids
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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
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0028—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for cooling heat generating elements, e.g. for cooling electronic components or electric devices
- F28D2021/0031—Radiators for recooling a coolant of cooling systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates to a thin liquid cooling (water cooling) system, and particularly, to a liquid cooling system that is suitable to be used for a notebook computer having a plurality of heat-generating elements (heat-generating sources).
- Recent notebook computers have a plurality of heat-generating elements, such as a GPU and a chip set as well as a CPU. How to effectively cool the plurality of heat-generating elements becomes a technical object for the computers. Further, in a notebook computer in which the storage space for components is limited, as is shown, for example, in Japanese Unexamined Patent Application Publication Nos. 2005-166030, 2003-324174, 2002-94277, and the like, a liquid cooling system is needed that is thin and which is highly unitary property.
- a conventional liquid cooling system needs tubes in order to connect elements to one another because a pump, a heat-absorbing unit, a heat-radiating unit (radiator), and the like are provided independently. Therefore, the system lacks in integrity (unit property), has a large amount of evaporation in coolant and has a problem even in assembling performance. Further, in a notebook computer in which a plurality of heat-generating elements exist, a heat-radiating structure that can radiate heat more efficiently is desired.
- a liquid cooling system includes a heat-radiating sheet having a pair of heat-conductive metal plates that are superimposed on each other, and having a circulating flow passage between the pair of heat-conductive metal plates.
- a plurality of heat-receiving areas are partitioned on the heat-radiating sheet.
- a plurality of heat-generating elements are installed on each of the heat-receiving areas via a heat spreader made of a heat-conductive material.
- An inlet hole and an outlet hole are opened to the surface of the heat-radiating sheet and located at both ends of the circulating flow passage.
- a pump has a discharge port and a suction port that communicate with the inlet hole and the outlet hole, and is installed on the heat-radiating sheet.
- a radiator continuous with the circulating flow passage of the heat-radiating sheet.
- FIG. 1 is an exploded perspective view showing one embodiment of a liquid cooling system
- FIG. 2 is an exploded perspective view of a heat-radiating sheet of FIG. 1 ;
- FIG. 3 is a plan view of FIG. 2 .
- FIG. 4 is a side view of FIG. 3 ;
- FIG. 5 is a plan view of a piezoelectric pump as a single body
- FIG. 6 is a sectional view taken along a line VI-VI of FIG. 5 ;
- FIG. 7 is a perspective view of a radiator as a single body
- FIG. 8 is a sectional view taken along a line VIII-VIII line of FIG. 7 ;
- FIG. 9 is a sectional view taken along a line IX-IX of FIG. 7 ;
- FIG. 10 is a plan view of a flow passage plate as a single body that constitutes each flow passage unit of the radiator.
- a liquid cooling system 100 of this embodiment includes, as its main components, a heat-radiating sheet 10 , a piezoelectric pump 20 , a radiator 40 , and a cooling fan (sirocco fan) 50 , and cools three heat-generating sources of a CPU 101 , a GPU 102 , and a chip set 103 .
- the heat-radiating sheet 10 is composed of a pair of heat-conductive metal plates 10 U and 10 L that are superimposed on each other, and three planar rectangular heat-receiving areas A, B, and C are set on the sheet 10 by facing slits (easily deformable portion) 10 a.
- the CPU 101 , GPU 102 , and chip set 103 that are located on the heat-receiving areas A, B, and C, respectively, are mounted (contacted) via heat spreaders 101 H, 102 H, and 103 H, respectively.
- the heat-conductive metal plates 10 U and 10 L of the heat-radiating sheet 10 are preferably made of a metallic material that contains SUS, copper, or aluminum as its main constituent, and the lower heat-conductive metal plate 10 L is formed with a flow passage recess 11 a that constitutes a circulating flow passage 11 .
- the depth of the flow-passage recess 11 a is, for example, around 0.5 mm.
- a flow passage cutoff protrusion 11 b is formed within the flow passage recess 11 a (circulating flow passage 11 ), and portions in front of or behind the flow passage cutoff protrusion 11 b constitute a flow passage starting end 11 c and a flow passage terminating end 11 d.
- the flow passage starting end 11 c communicates with a heat-absorbing outgoing flow passage 11 e that runs in order of the heat-receiving areas C, B, and A, a heat-absorbing folded-back flow passage 11 f, and a heat-absorbing incoming flow passage 11 g that runs in order of the heat-receiving areas A, B, and C, leads to an inflow end 11 h extending to the radiator 40 , and is then connected with the flow passage terminating end 11 d from a discharge end 11 i extending from the radiator 40 .
- the flow passages are drawn simply, they can be suitably made to meander so as to increase flow passage length.
- an inlet projection (inlet hole) 12 and an outlet projection (outlet hole) 13 that communicates with the circulating flow passage 11 are formed so as to project in correspondence with the flow passage starting end 11 c and the flow passage terminating end 11 d, and an outlet projection (outlet hole) 14 and an inlet projection (inlet hole) 15 are formed in correspondence with the radiator inflow end 11 h and the radiator discharge end 11 i.
- the inlet projection 12 and the outlet projection 13 communicate with and fit into a discharge port (hole) 34 and a suction port (hole) 35 of the piezoelectric pump 20 , respectively.
- the piezoelectric pump 20 is set on the upper heat-conductive substrate 10 U of the heat-radiating sheet 10 . That is, the piezoelectric pump 20 is located on any one of the surface and back of the heat-radiating sheet 10 , and the CPU 101 , GPU 102 , and the chip set 103 are located on the other face thereof. According to this arrangement, planar superimposition with a cooling fan can be permitted, cooling efficiency can be improved, and the planar size of the whole liquid cooling system 100 can be suppressed. Further, if the piezoelectric pump 20 and the radiator 40 are arranged on the lower side in FIG. 1 , the pump can be provided on the same face as a heat source. Thus, the upper face of the liquid cooling system 100 can be made flat, and the liquid cooling system 100 can be efficiently arranged below a keyboard of, for example, a notebook computer.
- the piezoelectric pump 20 has a lower housing 21 and an upper housing 22 sequentially from below.
- the discharge port 34 and the suction port 35 are bored in the lower housing 21 so as to be orthogonal to a plate thickness plane of the housing and parallel to each other.
- a piezoelectric vibrator (diaphragm) 28 is liquid-tightly sandwiched and supported between the upper housing 21 and the lower housing 22 via the O ring 29 , and a pump chamber P is formed between the piezoelectric vibrator 28 and the lower housing 21 .
- An atmospheric chamber P is formed between the piezoelectric vibrator 28 and the upper housing 22 .
- the piezoelectric vibrator 28 is a unimorph vibrator having a central shim 28 a, and a piezoelectric body 28 b stacked on one (upper face of FIG. 6 ) of the surface and back of the shim 28 a.
- the shim 28 a faces the pump chamber P and contacts liquid.
- the shim 28 a is made of a conductive metallic thin plate material, for example, a metallic thin plate having a thickness of about 50 to 300 ⁇ m and formed of stainless steel, a 42 alloy, or the like.
- the piezoelectric body 28 b is made of, for example PZT (Pb(Zr, Ti)O 3 ) having a thickness of about 300 ⁇ m, and is subjected to polarizing treatment in the direction of the surface and back thereof. Such a piezoelectric vibrator is widely known.
- the discharge port 34 and suction port 35 of the lower housing 21 are respectively provided with check valves (umbrella) 32 and 33 .
- the check valve 32 is a suction-side check valve that allows flow of fluid from the inlet port 35 to the pump chamber P, and does not allow flow of the fluid in a direction reverse thereto
- the check valve 33 is a discharge-side check valve that allows flow of the fluid from the pump chamber P to the outlet port 34 , and does not allow flow of the fluid in a direction reverse thereto.
- the check valves 32 and 33 have the same form, and are constructed by mounting umbrellas 32 b and 33 b made of an elastic material on perforated substrates 32 a and 33 a bonded and fixed to flow passages.
- Such check valves (umbrellas) themselves are widely known.
- a pumping action is obtained by making the piezoelectric vibrator 28 continuously elastically deform (vibrate), and liquid flows through the heat-absorbing outgoing flow passage lie, heat-absorbing folded-back flow passage 11 f, and heat-absorbing incoming flow passage 11 g in the heat-receiving areas A, B, and C from the flow passage starting end 11 c of the circulating flow passage 11 of the heat-radiating sheet 10 , thereby absorbing heat therefrom, then reaches the radiator inflow end 11 h, and then enters the radiator 40 .
- the liquid that is circulated through the radiator 40 and has radiated heat is discharged to the radiator discharge end 11 i, and returns to the flow passage terminating end 11 d.
- the radiator 40 is obtained by connecting the outlet projection (outlet hole) 14 and the inlet projection (inlet hole) 15 of the heat-radiating sheet 10 directly (without via a tube). As shown in FIGS. 7 to 9 , the radiator 40 of this embodiment is composed of a plurality of stages of stacked flow passage units 41 .
- the flow passage units 41 have the same structure except for an uppermost flow passage unit 41 .
- Each flow passage unit 41 is constituted by a pair of flow passage plates 42 U and 42 L that are superimposed on and coupled with each other.
- the flow passage plates 42 U and 42 L are constituted from, for example, press-molding articles made of a metallic material (brazing sheet) that is excellent in heat-conductivity, and have a symmetrical shape (the same single body shape) with respect to a superimposed face (stacked face).
- FIG. 10 shows a single body shape of the flow passage plate 42 U ( 42 L).
- the flow passage plate 42 U ( 42 L) has an elongated shape, and has a flat joining face 45 at a peripheral edge of a planar U-shaped flow passage recess 46 .
- Both ends (ends opposite to the U-shaped folded-back portion) of the U-shaped flow passage recess 46 are formed with spacers 47 S and 48 S that protrude outward from portions of the U-shaped flow passage recesses 46 , and an inlet hole 47 and an outlet hole 48 are bored in the spacers 47 S and 48 S, respectively.
- outlet projection (outlet hole) 14 and inlet projection (inlet hole) 15 that are formed in the heat-conductive metal plate 10 U fit into the inlet hole 47 and outlet hole 48 , respectively, of the lowermost flow passage unit 41 , and a plurality of layers of radiator flow passages are formed from the radiator inflow end 11 h to the radiator discharge end 11 i.
- the heat-radiating sheet 10 and the radiator 40 have a planar U-shaped space as a whole, and the cooling fan (sirocco fan) 50 is disposed within this U-shaped space.
- a blow-off direction W ( FIG. 1 , FIG. 3 ) of cooling wind of the cooling fan (sirocco fan) 50 turns to the radiator 40 , and the cooling wind cool the liquid that passes through the spaces S between the flow passage units 41 and flows through the flow passage units 41 .
- the cooling fan 50 can be efficiently applied to the cooling system 100 , space can be saved.
- the heat-receiving areas A, B, and C are defined on the single (made of a continuous metallic material) heat-radiating sheet 10 , and the CPU 101 (heat sink 101 H), the GPU 102 (heat sink 102 H), and the chip set 103 (heat sink 103 H) are mounted on the heat-receiving areas A, B, and C, respectively. Further, since the piezoelectric pump 20 and the radiator 40 are coupled together in the heat-radiating sheet 10 , all circulating flow passages are formed without using a flexible tube.
- each heat-receiving area can be deformed flexibly so as to follow the height difference, and thermal coupling to the flat face of each heat-generating elements can be made easy.
- the liquid discharged from the discharge port 34 of the piezoelectric pump 20 enters the circulating flow passage 11 (flow passage starting end 11 c ) from the inlet projection 12 of the heat-conductive metal plate 10 U, then flows through the heat-absorbing flow passage 11 e, 11 f, and 11 g in the heat-receiving areas A, B, and C, thereby absorbing heat from the CPU 101 , the GPU 102 , and the chipset 103 , and then reaches the outlet projection 14 of the heat-radiating sheet 10 at the radiator inflow end 11 h.
- the liquid that has reached the outlet projection 14 enters the cooling flow passage 11 X from the inlet hole 47 of each flow passage unit 41 of the radiator 40 and leaves the outlet hole 48 , the liquid is discharged to the radiator discharge end 11 i from the inlet projection 15 , and returns to the flow passage terminating end 11 d.
- the liquid that has reached the flow passage terminating end 11 d returns to the inside of the piezoelectric pump 20 from the inlet projection 12 , and thereafter, repeats the same circulation.
- the liquid that passes through the cooling flow passage 11 X within the radiator 40 is more sufficiently cooled by the cooling wind from the cooling fan (sirocco fan) 50 .
- easily deformable portions are formed in the heat-radiating sheet 10 by the facing slits (easily deformable portions) 10 a.
- the easily deformable portions may be formed by thin-walled portions.
- the facing slits (easily deformable portions) 10 a are formed in both the heat-conductive metal plates 10 U and 10 L, the facing slits (easily deformable portions) 10 a may be formed only at one of them.
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Abstract
A liquid cooling system includes a heat-radiating sheet having a pair of heat-conductive metal plates that are superimposed on each other, and having a circulating flow passage between the pair of heat-conductive metal plates; a plurality of heat-receiving areas partitioned on the heat-radiating sheet; a plurality of heat-generating elements installed on each of the heat-receiving areas via a heat spreader made of a heat-conductive material; an inlet hole and an outlet hole opened to the surface of the heat-radiating sheet and located at both ends of the circulating flow passage; a pump having a discharge port and a suction port that communicate with the inlet hole and the outlet hole, and installed on the heat-radiating sheet; and a radiator continuous with the circulating flow passage of the heat-radiating sheet.
Description
- This application claims benefit of Japanese Patent Application No. 2007-061507 filed on Mar. 12, 2007, which is hereby incorporated in its entirety by reference.
- 1. Field of the Invention
- The present invention relates to a thin liquid cooling (water cooling) system, and particularly, to a liquid cooling system that is suitable to be used for a notebook computer having a plurality of heat-generating elements (heat-generating sources).
- 2. Description of the Related Art
- Recent notebook computers have a plurality of heat-generating elements, such as a GPU and a chip set as well as a CPU. How to effectively cool the plurality of heat-generating elements becomes a technical object for the computers. Further, in a notebook computer in which the storage space for components is limited, as is shown, for example, in Japanese Unexamined Patent Application Publication Nos. 2005-166030, 2003-324174, 2002-94277, and the like, a liquid cooling system is needed that is thin and which is highly unitary property.
- However, a conventional liquid cooling system needs tubes in order to connect elements to one another because a pump, a heat-absorbing unit, a heat-radiating unit (radiator), and the like are provided independently. Therefore, the system lacks in integrity (unit property), has a large amount of evaporation in coolant and has a problem even in assembling performance. Further, in a notebook computer in which a plurality of heat-generating elements exist, a heat-radiating structure that can radiate heat more efficiently is desired.
- A liquid cooling system includes a heat-radiating sheet having a pair of heat-conductive metal plates that are superimposed on each other, and having a circulating flow passage between the pair of heat-conductive metal plates. A plurality of heat-receiving areas are partitioned on the heat-radiating sheet. A plurality of heat-generating elements are installed on each of the heat-receiving areas via a heat spreader made of a heat-conductive material. An inlet hole and an outlet hole are opened to the surface of the heat-radiating sheet and located at both ends of the circulating flow passage. A pump has a discharge port and a suction port that communicate with the inlet hole and the outlet hole, and is installed on the heat-radiating sheet. A radiator continuous with the circulating flow passage of the heat-radiating sheet.
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FIG. 1 is an exploded perspective view showing one embodiment of a liquid cooling system; -
FIG. 2 is an exploded perspective view of a heat-radiating sheet ofFIG. 1 ; -
FIG. 3 is a plan view ofFIG. 2 . -
FIG. 4 is a side view ofFIG. 3 ; -
FIG. 5 is a plan view of a piezoelectric pump as a single body; -
FIG. 6 is a sectional view taken along a line VI-VI ofFIG. 5 ; -
FIG. 7 is a perspective view of a radiator as a single body; -
FIG. 8 is a sectional view taken along a line VIII-VIII line ofFIG. 7 ; -
FIG. 9 is a sectional view taken along a line IX-IX ofFIG. 7 ; and -
FIG. 10 is a plan view of a flow passage plate as a single body that constitutes each flow passage unit of the radiator. - As shown in
FIGS. 1 to 4 , aliquid cooling system 100 of this embodiment includes, as its main components, a heat-radiatingsheet 10, apiezoelectric pump 20, aradiator 40, and a cooling fan (sirocco fan) 50, and cools three heat-generating sources of aCPU 101, aGPU 102, and achip set 103. - The heat-radiating
sheet 10 is composed of a pair of heat-conductive metal plates sheet 10 by facing slits (easily deformable portion) 10 a. On the face of the lower heat-conductive metal plate 10L opposite the upper heat-conductive substrate 10U, theCPU 101,GPU 102, andchip set 103 that are located on the heat-receiving areas A, B, and C, respectively, are mounted (contacted) viaheat spreaders - The heat-
conductive metal plates sheet 10 are preferably made of a metallic material that contains SUS, copper, or aluminum as its main constituent, and the lower heat-conductive metal plate 10L is formed with a flow passage recess 11 a that constitutes a circulatingflow passage 11. The depth of the flow-passage recess 11 a is, for example, around 0.5 mm. - A flow
passage cutoff protrusion 11 b is formed within the flow passage recess 11 a (circulating flow passage 11), and portions in front of or behind the flowpassage cutoff protrusion 11 b constitute a flowpassage starting end 11 c and a flowpassage terminating end 11 d. The flowpassage starting end 11 c communicates with a heat-absorbingoutgoing flow passage 11 e that runs in order of the heat-receiving areas C, B, and A, a heat-absorbing folded-back flow passage 11 f, and a heat-absorbing incoming flow passage 11 g that runs in order of the heat-receiving areas A, B, and C, leads to aninflow end 11 h extending to theradiator 40, and is then connected with the flowpassage terminating end 11 d from adischarge end 11 i extending from theradiator 40. Although the flow passages are drawn simply, they can be suitably made to meander so as to increase flow passage length. - In the heat-
conductive metal plate 10U, an inlet projection (inlet hole) 12 and an outlet projection (outlet hole) 13 that communicates with the circulatingflow passage 11 are formed so as to project in correspondence with the flowpassage starting end 11 c and the flowpassage terminating end 11 d, and an outlet projection (outlet hole) 14 and an inlet projection (inlet hole) 15 are formed in correspondence with theradiator inflow end 11 h and theradiator discharge end 11 i. Theinlet projection 12 and theoutlet projection 13 communicate with and fit into a discharge port (hole) 34 and a suction port (hole) 35 of thepiezoelectric pump 20, respectively. - The
piezoelectric pump 20 is set on the upper heat-conductive substrate 10U of the heat-radiatingsheet 10. That is, thepiezoelectric pump 20 is located on any one of the surface and back of the heat-radiatingsheet 10, and theCPU 101,GPU 102, and thechip set 103 are located on the other face thereof. According to this arrangement, planar superimposition with a cooling fan can be permitted, cooling efficiency can be improved, and the planar size of the wholeliquid cooling system 100 can be suppressed. Further, if thepiezoelectric pump 20 and theradiator 40 are arranged on the lower side inFIG. 1 , the pump can be provided on the same face as a heat source. Thus, the upper face of theliquid cooling system 100 can be made flat, and theliquid cooling system 100 can be efficiently arranged below a keyboard of, for example, a notebook computer. - Although the configuration of the pump (piezoelectric pump) 20 does not matter in the invention, the
piezoelectric pump 20 of the embodiment will be described with reference toFIGS. 5 and 6 . Thepiezoelectric pump 20 has alower housing 21 and anupper housing 22 sequentially from below. - The
discharge port 34 and thesuction port 35 are bored in thelower housing 21 so as to be orthogonal to a plate thickness plane of the housing and parallel to each other. A piezoelectric vibrator (diaphragm) 28 is liquid-tightly sandwiched and supported between theupper housing 21 and thelower housing 22 via theO ring 29, and a pump chamber P is formed between thepiezoelectric vibrator 28 and thelower housing 21. An atmospheric chamber P is formed between thepiezoelectric vibrator 28 and theupper housing 22. - The
piezoelectric vibrator 28 is a unimorph vibrator having acentral shim 28 a, and apiezoelectric body 28 b stacked on one (upper face ofFIG. 6 ) of the surface and back of theshim 28 a. Theshim 28 a faces the pump chamber P and contacts liquid. Theshim 28 a is made of a conductive metallic thin plate material, for example, a metallic thin plate having a thickness of about 50 to 300 μm and formed of stainless steel, a 42 alloy, or the like. Thepiezoelectric body 28 b is made of, for example PZT (Pb(Zr, Ti)O3) having a thickness of about 300 μm, and is subjected to polarizing treatment in the direction of the surface and back thereof. Such a piezoelectric vibrator is widely known. - The
discharge port 34 andsuction port 35 of thelower housing 21 are respectively provided with check valves (umbrella) 32 and 33. Thecheck valve 32 is a suction-side check valve that allows flow of fluid from theinlet port 35 to the pump chamber P, and does not allow flow of the fluid in a direction reverse thereto, and thecheck valve 33 is a discharge-side check valve that allows flow of the fluid from the pump chamber P to theoutlet port 34, and does not allow flow of the fluid in a direction reverse thereto. - The
check valves umbrellas perforated substrates - In the above
piezoelectric pump 20, if thepiezoelectric vibrator 28 elastically deform (vibrates) in a vertical direction in the direction of the diameter, the suction-side check valve 32 is opened and the discharge-side check valve 33 is closed, in a stroke where the volume of the pump chamber P increases. Therefore, liquid flows into the pump chamber P from the suction port 35 (outlet projection 13 of the heat-radiating sheet 10) (FIG. 7B ). On the other hand, in a stroke where the volume of the pump chamber P reduces, the discharge-side check valve 33 is opened and the suction-side check valve 32 is closed. Therefore, the liquid flows out of the pump chamber P into the discharge port 34 (inlet projection 12 of the heat-radiating sheet 10). Accordingly, a pumping action is obtained by making thepiezoelectric vibrator 28 continuously elastically deform (vibrate), and liquid flows through the heat-absorbing outgoing flow passage lie, heat-absorbing folded-back flow passage 11 f, and heat-absorbing incoming flow passage 11 g in the heat-receiving areas A, B, and C from the flowpassage starting end 11 c of the circulatingflow passage 11 of the heat-radiatingsheet 10, thereby absorbing heat therefrom, then reaches theradiator inflow end 11 h, and then enters theradiator 40. The liquid that is circulated through theradiator 40 and has radiated heat is discharged to theradiator discharge end 11 i, and returns to the flowpassage terminating end 11 d. - The
radiator 40 is obtained by connecting the outlet projection (outlet hole) 14 and the inlet projection (inlet hole) 15 of the heat-radiatingsheet 10 directly (without via a tube). As shown inFIGS. 7 to 9 , theradiator 40 of this embodiment is composed of a plurality of stages of stackedflow passage units 41. Theflow passage units 41 have the same structure except for an uppermostflow passage unit 41. - Each
flow passage unit 41 is constituted by a pair offlow passage plates flow passage plates FIG. 10 shows a single body shape of theflow passage plate 42U (42L). Theflow passage plate 42U (42L) has an elongated shape, and has a flat joiningface 45 at a peripheral edge of a planar U-shapedflow passage recess 46. Both ends (ends opposite to the U-shaped folded-back portion) of the U-shapedflow passage recess 46 are formed withspacers inlet hole 47 and anoutlet hole 48 are bored in thespacers - The above-described
flow passage plates faces 45 are joined together by, for example, brazing. Then, a flat U-shapedcoolant flow passage 11X is formed by the upper and lower U-shaped flow passage recesses 46 that protrudes in the directions opposite to each other. Further, thespacers 47S (48S) of the upper and lowerflow passage units 41 abut on each other, whereby the inlet holes 47 of the upper and lowerflow passage units 41 communicates, and the outlet holes 47 thereof communicate with each other. Between the superimposedflow passage units 41, a cooling air passage space S (FIG. 9 ) is formed. The inlet hole 47 (outlet hole 48) is not bored in thespacer 47S (48S) of the upperflow passage plate 42U of the uppermostflow passage unit 41. - The outlet projection (outlet hole) 14 and inlet projection (inlet hole) 15 that are formed in the heat-
conductive metal plate 10U fit into theinlet hole 47 andoutlet hole 48, respectively, of the lowermostflow passage unit 41, and a plurality of layers of radiator flow passages are formed from theradiator inflow end 11 h to theradiator discharge end 11 i. - The heat-radiating
sheet 10 and theradiator 40 have a planar U-shaped space as a whole, and the cooling fan (sirocco fan) 50 is disposed within this U-shaped space. A blow-off direction W (FIG. 1 ,FIG. 3 ) of cooling wind of the cooling fan (sirocco fan) 50 turns to theradiator 40, and the cooling wind cool the liquid that passes through the spaces S between theflow passage units 41 and flows through theflow passage units 41. According to such planar arrangement, since the wind generated from the coolingfan 50 can be efficiently applied to thecooling system 100, space can be saved. - In the
liquid cooling system 100 having the above configuration, the heat-receiving areas A, B, and C are defined on the single (made of a continuous metallic material) heat-radiatingsheet 10, and the CPU 101 (heat sink 101H), the GPU 102 (heat sink 102H), and the chip set 103 (heat sink 103H) are mounted on the heat-receiving areas A, B, and C, respectively. Further, since thepiezoelectric pump 20 and theradiator 40 are coupled together in the heat-radiatingsheet 10, all circulating flow passages are formed without using a flexible tube. Since the heat-receiving areas A, B, and C is partitioned by the facing slits (easily deformable portions) 10 a, even if a height difference is between CPU 101 (heat sink 101H), the GPU 102 (heat sink 102H), and the chip set 103 (heat sink 103H), each heat-receiving area can be deformed flexibly so as to follow the height difference, and thermal coupling to the flat face of each heat-generating elements can be made easy. - The liquid discharged from the
discharge port 34 of thepiezoelectric pump 20 enters the circulating flow passage 11 (flowpassage starting end 11 c) from theinlet projection 12 of the heat-conductive metal plate 10U, then flows through the heat-absorbingflow passage 11 e, 11 f, and 11 g in the heat-receiving areas A, B, and C, thereby absorbing heat from theCPU 101, theGPU 102, and thechipset 103, and then reaches theoutlet projection 14 of the heat-radiatingsheet 10 at theradiator inflow end 11h. After the liquid that has reached theoutlet projection 14 enters thecooling flow passage 11X from theinlet hole 47 of eachflow passage unit 41 of theradiator 40 and leaves theoutlet hole 48, the liquid is discharged to theradiator discharge end 11 i from theinlet projection 15, and returns to the flowpassage terminating end 11 d. The liquid that has reached the flowpassage terminating end 11 d returns to the inside of thepiezoelectric pump 20 from theinlet projection 12, and thereafter, repeats the same circulation. The liquid that passes through thecooling flow passage 11X within theradiator 40 is more sufficiently cooled by the cooling wind from the cooling fan (sirocco fan) 50. - In the above embodiment, easily deformable portions are formed in the heat-radiating
sheet 10 by the facing slits (easily deformable portions) 10 a. However, the easily deformable portions may be formed by thin-walled portions. Further, in the illustrated example, the facing slits (easily deformable portions) 10 a are formed in both the heat-conductive metal plates
Claims (11)
1. A liquid cooling system comprising:
a heat-radiating sheet having a pair of heat-conductive metal plates that are superimposed on each other, and having a circulating flow passage between the pair of heat-conductive metal plates;
a plurality of heat-receiving areas partitioned on the heat-radiating sheet;
a plurality of heat-generating elements installed on each of the heat-receiving areas via a heat spreader made of a heat-conductive material;
an inlet hole and an outlet hole opened to the surface of the heat-radiating sheet and located at both ends of the circulating flow passage;
a pump having a discharge port and a suction port that communicate with the inlet hole and the outlet hole, and installed on the heat-radiating sheet; and
a radiator continuous with the circulating flow passage of the heat-radiating sheet.
2. The liquid cooling systems according to claim 1 ,
wherein the plurality of heat-receiving areas are partitioned via easily deformable portions formed in the heat-radiating sheet.
3. The liquid cooling system according to claim 2 ,
wherein the easily deformable portions are slits formed in at least one of the pair of heat-conductive metal plates that constitute the heat-radiating sheet.
4. The liquid cooling system according to claim 1 ,
wherein the heat-radiating sheet and the radiator defines a planar U-shaped space, and a fan that gives cooling air to the radiator is arranged in the U-shaped space.
5. The liquid cooling system according to claim 1 ,
wherein the heat-generating elements are located on any one of the surface and back of the heat-radiating sheet, and the pump is located on the other face thereof.
6. The liquid cooling system according to claim 1 ,
wherein the inlet hole and outlet hole of the circulating flow passage are formed as cylindrical projections in the heat-radiating sheet, and the discharge port and suction port of the pump are formed as a discharge port that communicates with the cylindrical projection serving as the inlet hole, and a suction port that communicates with the cylindrical projection serving as the outlet hole.
7. The liquid cooling system according to claim 1 ,
wherein the pump is a piezoelectric pump.
8. The liquid cooling system according to claim 1 ,
wherein the heat-generating elements include a CPU and a GPU of a notebook computer.
9. The liquid cooling system of the claim 1 ,
wherein the radiator has a plurality of stacked flow passage units, and each of the flow passage units includes the inlet hole and the outlet hole, and a cooling flow passage connecting the inlet hole and the outlet hole.
10. The liquid cooling system according to claim 9 ,
wherein each flow passage unit is formed by stacking and coupling a pair of flow passage plates that form a liquid flow passage that is bent into a U shape at least once, and the inlet hole and the outlet hole are bored in the pair of flow passage plates.
11. The liquid cooling system according to claim 9 ,
wherein the pair of flow passage plates that constitute each flow passage unit has a plane-symmetrical shape that is symmetrical with respect to superimposed faces, and have a flow passage recess that forms a planar U-shape, and the inlet hole and the outlet hole that are formed at one end and the other end of the flow passage recess.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007-061507 | 2007-03-12 | ||
JP2007061507A JP2008225731A (en) | 2007-03-12 | 2007-03-12 | Liquid cooling system |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080223552A1 true US20080223552A1 (en) | 2008-09-18 |
Family
ID=39761478
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/046,187 Abandoned US20080223552A1 (en) | 2007-03-12 | 2008-03-11 | Liquid cooling system |
Country Status (3)
Country | Link |
---|---|
US (1) | US20080223552A1 (en) |
JP (1) | JP2008225731A (en) |
TW (1) | TW200900909A (en) |
Cited By (11)
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WO2010142492A1 (en) * | 2009-06-10 | 2010-12-16 | Siemens Aktiengesellschaft | Cooling medium line interconnection for achieving very uniform cooling temperatures and high availability particularly of power machines |
US20110232872A1 (en) * | 2010-03-29 | 2011-09-29 | Mou Hao Jan | Liquid heat-dissipating module |
US20120103576A1 (en) * | 2010-10-28 | 2012-05-03 | Asetek, A/S | Integrated liquid cooling system |
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US20120287577A1 (en) * | 2011-05-13 | 2012-11-15 | Abb Oy | Liquid cooling element |
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US20150289416A1 (en) * | 2013-04-02 | 2015-10-08 | Gerald Ho Kim | Silicon-based heat-dissipation device for heat-generating devices |
US20160234968A1 (en) * | 2015-02-10 | 2016-08-11 | Dynatron Corporation | Liquid-Cooled Heat Sink for Electronic Devices |
US20170055371A1 (en) * | 2015-08-20 | 2017-02-23 | Fujitsu Limited | Cooling apparatus and electronic equipment |
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JP5002522B2 (en) * | 2008-04-24 | 2012-08-15 | 株式会社日立製作所 | Cooling device for electronic equipment and electronic equipment provided with the same |
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JP2022094020A (en) * | 2020-12-14 | 2022-06-24 | レノボ・シンガポール・プライベート・リミテッド | Electronic device and cooling module |
-
2007
- 2007-03-12 JP JP2007061507A patent/JP2008225731A/en not_active Withdrawn
-
2008
- 2008-02-18 TW TW097105568A patent/TW200900909A/en unknown
- 2008-03-11 US US12/046,187 patent/US20080223552A1/en not_active Abandoned
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CN102460617A (en) * | 2009-06-10 | 2012-05-16 | 西门子公司 | Cooling medium line interconnection for achieving very uniform cooling temperatures and high availability particularly of power machines |
WO2010142492A1 (en) * | 2009-06-10 | 2010-12-16 | Siemens Aktiengesellschaft | Cooling medium line interconnection for achieving very uniform cooling temperatures and high availability particularly of power machines |
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US20110232872A1 (en) * | 2010-03-29 | 2011-09-29 | Mou Hao Jan | Liquid heat-dissipating module |
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US20120103576A1 (en) * | 2010-10-28 | 2012-05-03 | Asetek, A/S | Integrated liquid cooling system |
US8358505B2 (en) * | 2010-10-28 | 2013-01-22 | Asetek A/S | Integrated liquid cooling system |
US8432691B2 (en) | 2010-10-28 | 2013-04-30 | Asetek A/S | Liquid cooling system for an electronic system |
US20120287577A1 (en) * | 2011-05-13 | 2012-11-15 | Abb Oy | Liquid cooling element |
US20150289416A1 (en) * | 2013-04-02 | 2015-10-08 | Gerald Ho Kim | Silicon-based heat-dissipation device for heat-generating devices |
US9167723B1 (en) * | 2013-04-02 | 2015-10-20 | Gerald Ho Kim | Silicon-based heat-dissipation device for heat-generating devices |
US20160234968A1 (en) * | 2015-02-10 | 2016-08-11 | Dynatron Corporation | Liquid-Cooled Heat Sink for Electronic Devices |
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US20190212077A1 (en) * | 2018-01-11 | 2019-07-11 | Asia Vital Components Co., Ltd. | Water-cooling radiator structure with internal partition member |
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Also Published As
Publication number | Publication date |
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TW200900909A (en) | 2009-01-01 |
JP2008225731A (en) | 2008-09-25 |
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