WO2020070533A1 - 冷却装置 - Google Patents
冷却装置Info
- Publication number
- WO2020070533A1 WO2020070533A1 PCT/IB2018/001216 IB2018001216W WO2020070533A1 WO 2020070533 A1 WO2020070533 A1 WO 2020070533A1 IB 2018001216 W IB2018001216 W IB 2018001216W WO 2020070533 A1 WO2020070533 A1 WO 2020070533A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- flow
- heat sink
- cooling device
- induced
- induced flow
- Prior art date
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
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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
- F28D1/0233—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 air flow channels
- F28D1/024—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 air flow channels with an air driving element
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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
- H01L23/467—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing gases, e.g. air
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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
- F28D2021/0029—Heat sinks
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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
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
- F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
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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
- F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
- F28F2250/08—Fluid driving means, e.g. pumps, fans
Definitions
- the present invention relates to a cooling device.
- a power conversion device such as a converter includes electronic components serving as heating elements such as a semiconductor, a capacitor, and a coil, a heat sink for cooling these components is attached.
- a power conversion device such as a converter includes electronic components serving as heating elements such as a semiconductor, a capacitor, and a coil
- a heat sink for cooling these components is attached.
- it is required to configure each circuit element and the cooling structure at a high density from the viewpoint of realizing high power and miniaturization.
- the cooling performance of the heat sink generally depends on its volume (heat capacity), material (thermal conductivity), and surface area (heat transfer area) according to the shape.
- JP2013-016569A proposes a cooling device using such a heat sink.
- this cooling device there has been proposed a cooling device that injects a refrigerant to a heat sink on which a heating element is mounted, through a plurality of ducts that form a flow path of the refrigerant.
- an object of the present invention is to provide a cooling device that can appropriately adjust the refrigerant flow path while suppressing an increase in size.
- a cooling device including a heat sink to which a heating element is joined, a main flow generating device that generates a main flow for cooling the heat sink, and an induced flow generating device that electrically generates an induced flow.
- the induced flow generator is provided on a support member facing the heat sink.
- FIG. 1 is a cross-sectional view illustrating a configuration of a cooling device according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along line A-A 'in FIG.
- FIG. 3 is a sectional view taken along line B-B ′ in FIG. 1.
- FIG. 4 is a cross-sectional view illustrating a configuration of a cooling device according to Modification Example 1-1.
- FIG. 5 is a cross-sectional view illustrating a configuration of a cooling device according to Modification Example 1-2.
- FIG. 6 is a perspective view illustrating a configuration of a cooling device according to Modification Example 1-3.
- FIG. 7 is a plan view of a main part of the support member of FIG.
- FIG. 8 is a cross-sectional view illustrating a configuration of a plasma actuator according to the second embodiment.
- FIG. 9 is a cross-sectional view illustrating a configuration of a cooling device provided with a plasma actuator.
- FIG. 10 is a cross-sectional view illustrating a configuration of a cooling device (plasma actuator is in an off state) according to Modification 2-1.
- FIG. 11 is a cross-sectional view illustrating a configuration of a cooling device (plasma actuator is in an ON state) according to Modification 2-1.
- FIG. 12 is a cross-sectional view illustrating a configuration of a cooling device (the plasma actuator is in an off state) according to the third embodiment.
- FIG. 13 is a cross-sectional view illustrating a configuration of a cooling device (the plasma actuator is in an ON state) according to the third embodiment.
- FIG. 14 is a cross-sectional view illustrating a configuration of a cooling device according to the fourth embodiment.
- FIG. 15 is a cross-sectional view taken along line A-A ′ in FIG. 14.
- FIG. 16 is a perspective view of a main part of the cooling device of FIG.
- FIG. 17 is a perspective view of a main part for describing a configuration of a cooling device according to Modification Example 4-1.
- FIG. 18 is a perspective view of a main part for describing a configuration of a cooling device according to Modification Example 4-2.
- FIG. 19 is a perspective view of a main part illustrating a configuration of a cooling device according to Modification 4-3.
- FIG. 20 is a perspective view of a principal part explaining the configuration of a cooling device according to Modification 4-4.
- FIG. 21 is a perspective view of a main part for describing a configuration of a cooling device according to Modification 4-5.
- FIG. 22 is a perspective view of a principal part explaining the configuration of a cooling device according to Modification 4-6.
- FIG. 23 is a perspective view of a main part for describing a configuration of a cooling device according to Modification 4-7.
- FIG. 24 is a diagram showing a configuration of FIG. 23 as viewed in the direction of arrow AR.
- FIG. 24 is a diagram showing a configuration of FIG. 23 as viewed in the direction of arrow AR.
- FIG. 25 is a perspective view of a main part for explaining a configuration of a cooling device according to the fifth embodiment.
- FIG. 26 is a perspective view of a main part for describing a configuration of a cooling device according to Modification Example 5-1.
- FIG. 27 is a perspective view of a principal part explaining the configuration of a cooling device according to Modification Example 5-2.
- FIG. 28 is a perspective view of a main part for describing a configuration of a cooling device according to Modification Example 5-3.
- FIG. 1 is a cross-sectional view in the flow direction for explaining the configuration of the cooling device 10 according to the present embodiment.
- FIG. 2 is a sectional view taken along line A-A 'in FIG.
- FIG. 3 is a sectional view taken along line B-B ′ in FIG. 1.
- the cooling device 10 includes a heating element 1, a heat sink main body 2 constituting a heat sink of the present embodiment, an induced flow generating device 3 for generating an induced flow If, and a fan 4 as a main flow generating device for generating a main flow Mf. , And a support member 9 arranged to face the heat sink body 2.
- the heating elements 1 are various heating elements included in electronic devices such as motors, engines, and home appliances. In particular, as the heating element 1, electronic components such as a semiconductor, a semiconductor molded package, a capacitor, and a coil are assumed.
- the heat sink body 2 is a structure that releases the heat generated by the heating element 1 into the surrounding atmosphere.
- the heat sink body 2 is formed as a plate-like member.
- the heating element 1 is joined to a first surface 2a, which is a surface on one side (negative Z-axis direction side) of the heat sink body 2.
- the heat sink body 2 is made of, for example, a metal material having a relatively high thermal conductivity such as copper or aluminum, or a non-metal material having a relatively high thermal conductivity such as FR4 (Flame Retardant Type 4) or ceramics. .
- the induced flow generator 3 is provided on the front surface 9a of the support member 9 facing the second surface 2b which is the back surface of the first surface 2a of the heat sink body 2.
- the induced flow generator 3 is provided so as to extend over the entire extension region of the surface 9a of the support member 9 in the Y-axis direction.
- the induced flow generator 3 has an induced flow generator 3a on one side in the X-axis direction (in the figure, the X-axis negative direction). Therefore, the induced flow generation device 3 can generate the induced flow If in the negative X-axis direction in FIG.
- the relationship between the width in the Y direction between the heating element 1 and the surface 9a of the support member 9 is such that the induced flow If has an effect on heat transfer according to the width and the amount of heat of the heating element 1 and the area where heat spreads to the heat sink body 2. It can be appropriately adjusted so as to obtain a desired width.
- the induced flow generator 3 electrically connects molecules in a surrounding phase (a gas phase such as an inert gas atmosphere such as an air atmosphere, a nitrogen atmosphere or an argon atmosphere, or a liquid phase such as water).
- a gas phase such as an inert gas atmosphere such as an air atmosphere, a nitrogen atmosphere or an argon atmosphere, or a liquid phase such as water.
- This is a device that acts to generate an induced flow If by imparting a pressure difference by giving a bias to the charge distribution in the atmosphere.
- the surrounding phase is an air atmosphere (air layer 7).
- air layer 7 air layer 7
- the following description can be similarly applied to other gas or liquid phases.
- the induced flow generator 3 of the present embodiment is arranged upstream of the heating element 1 in the flow direction (X-axis direction) of the main flow Mf.
- the fan 4 is appropriately constituted by a DC / AC shaft fan, a blower fan, or the like in consideration of factors such as an air volume and a wind speed required according to the form and the installation space of components or equipment assumed as the heating element 1.
- a fan 4 of a type corresponding to the form of the heat radiation fins 6.
- the fan 4 is provided near one end of the heat sink body 2 in the X-axis direction (the left end in FIG. 1).
- the main flow Mf flows between the second surface 2b of the heat sink body 2 and the surface 9a of the support member 9 in the positive X-axis direction.
- the induced flow flows from the induced flow generator 3 in the negative X-axis direction.
- the flow direction of the main flow Mf and the flow direction of the induced flow are substantially parallel to each other and substantially opposite to each other.
- the main flow Mf from the fan 4 is guided by the induced flow If from the induced flow generator 3 in the opposite direction, and is guided in the direction of the second surface 2b of the heat sink body 2 (Z-axis negative direction).
- the induced flow generation device 3 since the induced flow generation device 3 is disposed upstream of the heating element 1 in the flow direction of the main flow Mf, the main flow Mf is secondarily generated by the induced flow If upstream of the heating element 1. It will be guided in the direction of the surface 2b.
- the center position Cf of the main flow Mf whose flow velocity is relatively high is guided to approach the heating element 1. Thereby, heat transfer from the second surface 2b of the heat sink body 2 to the air layer 7 can be promoted.
- the heat of the heating element 1 is first transmitted to the heat sink body 2. Then, the heat transmitted to the heat sink main body 2 is diffused in the heat sink main body 2 and conducts in the negative Z-axis direction (the direction of the induced flow generation device 3).
- the induced flow If generated by the induced flow generator 3 flows in the positive direction of the X-axis along the second surface 2b of the heat sink main body 2, and the heat between the second surface 2b of the heat sink main body 2 and the air layer 7 is generated. Promote communication.
- the induced flow If can flow at the interface of the air layer 7 in contact with the heat sink body 2 immediately below the heating element 1, excessive development of a boundary layer such as a heat insulating layer generated between solid fluids can be suppressed. it can. As a result, it is possible to perform cooling effectively with a relatively small flow rate of the induced flow If.
- a heat sink body 2 as a heat sink to which the heating element 1 is joined
- a fan 4 as a main flow generator for generating a main flow Mf for cooling the heat sink body 2
- the induced flow generator 3 is provided on a support member 9 facing the heat sink body 2.
- the flow direction of the main flow Mf of the fan 4 that cools the heat transmitted from the heating element 1 to the heat sink body 2 can be adjusted by the induced flow If of the induced flow generator 3. Therefore, the main flow Mf can be guided to a portion where the amount of heat is relatively high, such as the vicinity of the heating element 1 in the heat sink body 2, so that heat transfer in the portion can be promoted. Is low (a part far from the heating element 1), the flow velocity of the main flow Mf can be reduced to suppress the pressure loss. As a result, the cooling efficiency of the heating element 1 can be further improved.
- the induced flow generation device 3 is arranged to generate the induced flow If that induces the flow of the main flow Mf in the direction of the heat sink body 2 (the negative direction of the Z axis in FIG. 1).
- the induced flow generating device 3 and the fan 4 are arranged such that the flow direction of the main flow Mf and the flow direction of the induced flow If are substantially parallel and substantially opposite to each other.
- the flow of the main flow Mf can be obstructed in the vicinity of the induced flow generation part (the induced flow generation part 3a) in the induced flow generation device 3. Therefore, the flow of the main flow Mf can be guided in the direction of the heat sink main body 2 facing the support member 9 provided with the induced flow generator 3. As a result, the flow velocity of the cooling air around the heat sink body 2 can be increased, and the cooling performance can be further improved.
- the induced flow generation device 3 is arranged at a position upstream of the heating element 1 in the flow direction of the main flow Mf (on the negative side of the X axis in FIG. 1).
- the portion where the main flow Mf is guided toward the heat sink body 2 by the action of the induced flow If (the portion where the flow rate / flow velocity is high) is moved to a portion relatively close to the heating element 1 around the heat sink body 2. You can guess. As a result, heat transfer between the heat sink body 2 and the air layer 7 is further promoted, and the cooling performance for the heating element 1 can be further improved.
- the heating element 1 of the present embodiment is assumed to be an electronic component provided in an electronic device such as a motor, an engine, and a home appliance. That is, the configuration of the cooling device 10 of the present embodiment can be applied to a case in which an electronic component such as a semiconductor, a capacitor, and a coil that generates heat when energized is used as the heating element 1. Therefore, a suitable configuration for cooling the electronic component is provided.
- FIG. 4 is a cross-sectional view of the cooling device 10 according to the modified example 1-1.
- the induced flow generator 3 directs the induced flow generator 3a in the negative direction of the Z-axis so that the induced flow If flows toward the heat sink body 2. It is provided on the support member 9 in a state.
- the induced flow generating device 3 is arranged to generate the induced flow If in a direction in which the flow of the main flow Mf is guided to the heat sink main body 2.
- the induced flow generator 3 and the fan 4 are arranged such that the flow direction of the main flow Mf and the flow direction of the induced flow If are substantially parallel to each other and substantially opposite to each other. Further, the induced flow If is arranged so that the flow of the induced flow If is substantially orthogonal to the direction from the support member 9 to the heat sink body 2.
- the induced flow If can be caused to flow against the main flow Mf from the fan 4 from a direction substantially perpendicular to the flow direction of the main flow Mf. That is, the induced flow in the direction in which the flow of the main flow Mf is guided to the heat sink body 2 is different from the configuration in which the flow direction of the main flow Mf and the flow direction of the induced flow If shown in FIG. A configuration for generating If can be realized. As a result, even when there is a difference in layout such as a different installation position of the fan 4 or the like according to various uses of the cooling device 10, the mainstream Mf is applied to the heat sink body 2 according to the difference in layout. A configuration for generating the induced flow If so as to induce the flow can be realized more generally.
- the specific configuration in which the flow direction of the induced flow If by the induced flow generation device 3 provided on the support member 9 is set to the direction toward the heat sink body 2 is not limited to the configuration described in the present modification.
- two induced flow generating devices 3 that generate the induced flow If substantially in parallel with the main flow Mf are arranged on the surface 9a of the support member 9 such that the respective induced flow generating portions 3a face each other.
- a combined induced flow If directed in the vertical direction (the direction of the heat sink body 2) may be generated. That is, the induced flow If generated by the plurality of induced flow generators 3 may be combined to generate a flow toward the heat sink body 2.
- FIG. 5 is a cross-sectional view of the cooling device 10 according to Modification Example 1-2.
- the induced flow generator 3 is provided downstream of the heating element 1 in the flow direction of the main flow Mf (on the X-axis positive direction side in FIG. 5). ing.
- the cooling device 10 shown in FIG. 5 is further arranged on the downstream side in the flow direction of the main flow Mf with respect to the other cooling devices 10 described in FIGS. That is, the main flow Mf in the present modification is used for cooling in the other cooling device 10 provided on the upstream side, and has a higher calorific value than the main flow Mf immediately generated from the fan 4.
- the induced flow generator 3 is provided on the surface 9a of the support member 9 with the induced flow generator 3a oriented in the positive X-axis direction. Therefore, the flow of the induced flow If generated by the induced flow generator 3 is substantially parallel to the main flow Mf from the fan 4.
- the main flow Mf from the fan 4 is guided in the direction of the surface 9a of the support member 9 by the induced flow If from the induced flow generator 3a. Therefore, the center position Cf of the flow of the main flow Mf can be moved toward the support member 9.
- the induced flow generation device 3 is arranged to generate the induced flow If in a direction in which the flow of the main flow Mf is guided to the support member 9.
- the flow of the main flow Mf can be brought to the support member 9 side, and can be kept away from the heat sink body 2 provided with the heating element 1 to be cooled. Therefore, for example, when the mainstream Mf retains heat due to being already used for cooling on the upstream side and it is not preferable to apply the mainstream Mf to the heat sink body 2 from the viewpoint of cooling, the flow is transferred to the heat sink body 2. Can be separated from
- the pressure distribution in the air layer 7 between the heat sink body 2 and the support member 9 can be appropriately changed by bringing the flow of the main flow Mf toward the support member 9 side.
- the induced flow generating device 3 is disposed so as to be substantially parallel to and substantially in the same direction as the flow of the main flow Mf.
- the flow of the main flow Mf is induced by the action of the induced flow If along the flow direction of the induced flow If. Therefore, a specific mode for bringing the flow of the main flow Mf toward the support member 9 can be realized by a simple configuration in which the arrangement of the induced flow generator 3 is adjusted.
- the induced flow generation device 3 is disposed at a downstream position (the X-axis positive direction side in FIG. 5) of the heating element 1 in the flow direction of the main flow Mf.
- the effect of the induced flow If that induces the main flow Mf already used for cooling and retaining heat in the direction of the support member 9 can be exerted upstream of the heating element 1. Then, the main flow Mf is brought closer to the support member 9 at the position upstream of the heating element 1, thereby mixing with the fluid in which heat transfer around the support member 9 is not actively performed. As a result, the temperature of the main stream Mf can be lowered.
- FIG. 6 is a perspective view of the cooling device 10 according to the modified example 1-3.
- FIG. 7 is a plan view of a main part of the support member 9 in FIG. 6 when viewed from the Z-axis positive direction side.
- the induced flow generator 3 is provided on the surface 9a of the support member 9 with the induced flow generator 3a directed in the negative Y-axis direction. .
- the fan 4 is arranged so that the flow of the main flow Mf is along the positive direction of the X-axis.
- the heating element 1 is disposed at a position on the first surface 2a of the heat sink body 2 closer to the positive direction of the X-axis and the negative direction of the Y-axis (the position on the left side in FIG.
- the flow of the main flow Mf and the flow of the induced flow If are substantially orthogonal to each other, and the flow of the induced flow If is substantially parallel to the second surface 2b of the heat sink body 2.
- the flow of the induced flow If and the flow of the induced flow If are substantially perpendicular to each other, and the flow of the induced flow If It is arranged so as to be substantially parallel to the second surface 2b which is the second surface.
- the heating element 1 is provided on the first surface 2a at a position closer to the X-axis positive direction and the Y-axis negative direction.
- the flow of the main flow Mf can be collected at a peripheral position of the second surface 2b opposite to the first surface 2a on which the heating element 1 is installed (hereinafter, also referred to as a “heating element facing position P1”), and more cooling is achieved. Efficiency can be improved.
- the induced flow If depends on the arrangement of the induced flow generator 3 or the fan 4. Can adjust the flow of the main stream Mf in a desired direction. Therefore, in an electronic device or the like including a heat generating electronic component such as a conductor, a molded package of a semiconductor, a capacitor, and a coil, the flow of the main stream Mf is controlled without providing a partition or the like for adjusting the path of the main stream Mf. be able to.
- the cooling device 10 including at least two of the induced flow generation devices 3 described in the first embodiment and the modified examples 1-1 to 1-3 may be configured. That is, at least two of the induced flow generator 3 described in FIGS. 1 to 3, the induced flow generator 3 described in FIG. 4, and the induced flow generator 3 described in FIGS.
- the cooling device 10 provided may be configured. Thereby, the suitable cooling device 10 according to a use can be implement
- FIG. 8 is a cross-sectional view illustrating a configuration of a plasma actuator 17 according to the second embodiment.
- the plasma actuator 17 is configured by sandwiching the dielectric 14 between the first electrode 12 and the grounded second electrode 13. Further, the plasma actuator 17 is connected to the power supply device 15. A predetermined insulating layer is formed on the upper and lower portions of the plasma actuator 17.
- the first electrode 12 and the second electrode 13 are provided at positions shifted from each other in the Z-axis direction.
- the first electrode 12 and the second electrode 13 are made of a metal material such as copper, aluminum, or iron.
- the first electrode 12 and the second electrode 13 are made of, for example, a copper tape having a thickness on the order of several hundred ⁇ m.
- the dielectric 14 is made of a predetermined insulating material.
- the insulating material it is preferable to employ polytetrafluoroethylene, polyimide, or nylon from the viewpoint of high voltage resistance and high insulating properties. With these insulating materials, it is possible to maintain resistance to a high voltage of about several kV even if the thickness is on the order of several hundreds of ⁇ m.
- the second electrode 13 and the dielectric 14 are provided so as to be displaced from each other in the Y-axis direction (the direction perpendicular to the plane of FIG. 23). That is, the second electrode 13 and the dielectric 14 are provided so as not to overlap with each other in the Z-axis direction.
- the plasma actuator 17 of the present embodiment is configured such that the entire thickness in the Z-axis direction is, for example, about 1 mm or less.
- the power supply device 15 is constituted by an AC power supply, and is connected to the first electrode 12 and the second electrode 13 of the plasma actuator 17, respectively. That is, the power supply device 15 applies an AC voltage to the plasma actuator 17 to generate the plasma atmosphere 16 from the first electrode 12 on the X-axis positive direction side.
- the ions in the plasma atmosphere 16 are moved by electrically acting on the air molecules to generate an induced flow If flowing along the positive direction of the X-axis. That is, the first electrode 12 functions as the induced flow generator 3a.
- the induced flow If generated by the plasma actuator 17 is generated from the first electrode 12 in the positive X-axis direction, but the flow velocity is maximum at a position P2 that is separated from the plasma atmosphere 16 by a predetermined distance in the X-axis positive direction. Becomes This is because the charged particles in the plasma atmosphere 16 generate a body force due to the Coulomb force to start accelerating and reach a constant velocity at the above-mentioned predetermined distance.
- the predetermined distance from the plasma atmosphere 16 in which the above-described induced flow If is generated depends on the frequency of the applied AC voltage of the power supply device 15, the electrode material, and the material of the dielectric 14, but is, for example, several mm to several cm. .
- the applied voltage (effective value of the applied AC voltage) of the power supply device 15 is about several kV and the AC frequency is about 20 kHz or less
- the position P ⁇ b> 2 is a part separated by about 2 cm from the plasma atmosphere 16.
- the installation position of the plasma actuator 17 is appropriately adjusted in consideration of the position P2 where the flow velocity of the induced flow If is maximized.
- FIG. 9 is a cross-sectional view illustrating the configuration of the cooling device 10 including the plasma actuator 17.
- the cooling device 10 of the present embodiment has a configuration in which the cooling device 10 of the present embodiment employs the plasma actuator 17 as the induced flow generator 3 of the cooling device 10 described in FIG. More specifically, the second electrode 13 and the dielectric 14 are connected to the surface 9a of the support member 9. Note that an insulating material may be appropriately provided between the plasma actuator 17 and the surface 9a of the support member 9.
- the induced flow generator 3 can be formed relatively thin. Thereby, the situation where the plasma actuator 17 itself obstructs the flow of the fluid along the second surface 2b of the heat sink body 2 can be more suitably suppressed.
- the plasma actuator 17 can electrically control the induced flow If. More specifically, by switching on / off the power supply by the power supply device 15, it is possible to switch between a state in which the induced current If is generated and a state in which the induced flow If is not generated. By switching on / off of the power supply, it is possible to disturb the flow of the main flow Mf to promote turbulence and improve heat transfer. Further, in a situation where it is not necessary to generate the induced flow If, the power supply is turned off, so that it is possible to suppress the occurrence of the pressure loss due to the action of the induced flow If. Further, by appropriately adjusting the magnitude of the voltage applied by the power supply device 15, the flow velocity and the flow rate of the induced flow If can be adjusted.
- the plasma actuator 17 is provided on the support member 9 that is separate from the heat sink body 2 to which the heating element 1 is joined. Therefore, the transmission of heat due to the power loss due to the operation of the plasma actuator 17 to the vicinity of the heating element 1 is suppressed.
- the induced flow generator 3 includes the plasma actuator 17 having the dielectric 14 interposed between the first electrode 12 and the second electrode 13.
- the plasma actuator 17 can be formed relatively small, it is possible to more suitably suppress the situation where the induced flow generator 3 itself inhibits the flow of the fluid along the second surface 2 b of the heat sink body 2. Can be.
- the plasma actuator 17 is provided on the support member 9 that is separate from the heat sink body 2 that is separate from the heat sink body 2 to which the heating element 1 is joined. Therefore, thermal interference between the plasma actuator 17 and the heating element 1 can be suppressed.
- the cooling device 10 of the present embodiment further includes a power supply device 15 as a control device for controlling the magnitude and frequency of the AC voltage applied to the plasma actuator 17.
- the power supply device 15 to electrically control the flow velocity and the flow rate of the induced flow If. Therefore, by adjusting the flow velocity and the flow rate of the induced flow If by the power supply device 15, the flow of the main flow Mf (the center position Cf of the flow) can be appropriately adjusted. Therefore, the flow of the main flow Mf can be controlled with higher responsiveness as compared with the existing passive components (such as the structure of the flow path) such as a partition wall, and a real-time flow corresponding to the state of the heating element 1 and the cooling device 10 can be realized. Control becomes possible.
- the plasma actuator 17 is positioned between the heat generating element 1 and the second surface 2b (the heat generating element facing position P1) facing the heat generating element 1 joined to the first surface 2a of the heat sink body 2. They are arranged at positions separated by a predetermined distance between them.
- the cooling can be performed more efficiently.
- the center position Cf of the heating element 1 is located at the position P2 where the flow velocity of the induced flow If generated by the plasma actuator 17 is maximum, the cooling efficiency is further improved. Further, since the plasma actuator 17 and the heating element 1 are arranged apart from each other, it is possible to suppress thermal interference with the heating element 1 due to heat generated by the plasma actuator 17.
- FIGS. 10 and 11 for describing the modified example 2-1 specific examples of the plasma actuator 17 such as the first electrode 12, the second electrode 13, and the dielectric 14 are described for simplification of the drawings. The configuration is not shown.
- FIG. 10 shows the cooling device 10 when the fan 4 generates the main flow Mf, but the plasma actuator 17 is turned off (state where no AC voltage is applied).
- FIG. 10 shows the cooling device 10 when the fan 4 generates the main flow Mf and the plasma actuator 17 is in an on state (a state where an AC voltage is applied).
- the cooling device 10 takes a form in which the heat sink main body 2, the plasma actuator 17, the fan 4, and the support member 9 are accommodated in the housing 5.
- the power supply device 15 is disposed, for example, outside the housing 5 and is connected to the plasma actuator 17 via wiring holes in the housing 5.
- the housing 5 is made of a metal material or a resin material.
- the heating element 1 is an electronic component and the housing 5 is made of a metal material such as aluminum, it is preferable that the surface of the housing 5 be subjected to an insulation treatment such as an alumite treatment.
- the support member 9 of this embodiment is provided in the lower part (end of the Z-axis positive direction side) of the housing
- the main flow Mf is taken in from the inlet 5a of the housing 5 on the left side in the figure by the operation of the fan 4. Then, the taken-in mainstream Mf is used for cooling the heat sink body 2 in the housing 5 and is discharged from the outlet 5b of the housing 5.
- the main surface Mf and the induced flow If from the fan 4 are maintained and diffused in the housing 5, and the second surface 2b of the heat sink body 2 and the surface 9a of the support member 9 are not diffused. Can flow into the air layer 7. For this reason, heat transfer between the heat sink body 2 and the air layer 7 can be performed more efficiently, and the cooling performance is further improved. Further, the housing 5 can more reliably prevent external exposure, electric shock, and the like.
- each plasma actuator 17 is provided at a position upstream of each heating element 1 (a position closer to the negative direction of the X-axis) in the flow direction of the main flow Mf. Further, each plasma actuator 17 is arranged so as to flow the induced flow If in a direction substantially opposite to the flow of the main flow Mf (the negative direction of the X axis).
- the center position Cf of the main flow Mf is maintained at substantially the center between the heat sink body 2 and the support member 9 in the Z-axis direction. That is, the flow of the main flow Mf is not affected by the induced flow If, and the occurrence of turbulence is suppressed and the pressure loss is suppressed.
- the flow of the main stream Mf can be controlled in real time by switching between the ON state and the OFF state of the plasma actuator 17 as necessary.
- the support member 9 is configured as a part of the housing 5 surrounding the heat sink body 2.
- the diffusion of the main flow Mf and the induced flow If can be suppressed, and the cooling can be efficiently performed. Further, components having a relatively high voltage, such as the heating element 1 such as the plasma actuator 17 provided on the support member 9 or the electronic component bonded to the heat sink main body 2, can be cut off from the outside, so that exposure, electric shock and the like can be prevented. It can be prevented more reliably.
- the space can be reduced as compared with a case where the support member 9 is separately formed inside the housing 5. As a result, it contributes to downsizing of the entire cooling device 10.
- FIGS. 12 and 13 are cross-sectional views illustrating the configuration of the cooling device 10 according to the third embodiment.
- FIG. 12 shows the cooling device 10 in a case where the fan 4 generates the main flow Mf but the plasma actuator 17 is in an off state (a state where no AC voltage is applied).
- FIG. 13 shows the cooling device 10 when the fan 4 generates the main flow Mf and the plasma actuator 17 is turned on (state where an AC voltage is applied).
- specific configurations of the first electrode 12, the second electrode 13, and the plasma actuator 17 such as the dielectric 14 are not shown for simplification of the drawings.
- the radiation fins 6 are provided on the second surface 2b of the heat sink body 2.
- the radiating fin 6 is a member that radiates heat transmitted from the heating element 1 through the heat sink body 2 to the air layer 7 from the surface 6a. That is, the radiation fins 6 have a structure configured to increase the heat transfer area (surface area) between the heat sink and the air layer 7.
- the heat radiation fin 6 is formed in a substantially rectangular shape in cross section extending from the second surface 2b of the heat sink body 2 downward in FIGS. 12 and 13, that is, toward the support member 9.
- a plurality (four in FIGS. 12 and 13) of the radiation fins 6 of the present embodiment are provided at a substantially constant pitch along the Y-axis direction, and are configured in a comb shape as a whole.
- the radiation fins 6 are made of the same material as the heat sink body 2 or a different material. That is, the radiation fins 6 are made of, for example, a metal material having a relatively high thermal conductivity such as copper or aluminum, or a non-metal material having a relatively high thermal conductivity such as FR4 or ceramics.
- the heat radiation fins 6 are formed of a non-conductive material having a relatively high thermal conductivity, so that the heat sink main body 2 and the heat radiation fins 6 are formed.
- the insulation function can be provided while ensuring the heat conduction performance between the two.
- the heatsink body 2 is made of an insulating material and has an insulating function with respect to the heating element 1, the radiating fins 6 are made of aluminum or the like having relatively high thermal conductivity and low cost. It is preferable to be formed of a material.
- the cooling device 10 also includes the fan 4 at one end of the heat sink body 2 in the X-axis direction, similarly to the cooling device 10 described with reference to FIG. 1. It is provided in the vicinity. Therefore, the main flow Mf from the fan 4 flows through a part of the space partitioned by the adjacent heat radiation fins 6 and flows from the labor side in FIG. 12 and FIG.
- the center position Cf of the flow of the main flow Mf formed between the adjacent radiation fins 6 is different from the heat sink body 2 and the support member 9. Is substantially at the center in the Z-axis direction. That is, the flow of the main flow Mf is not affected by the induced flow If, and the occurrence of turbulence is suppressed and the pressure loss is suppressed.
- the heat sink body 2 in the cooling device 10 according to the present embodiment further includes the radiation fins 6 provided on the second surface 2b as the back surface of the first surface 2a which is the joining surface of the heating element 1.
- the plasma actuator 17 is provided on the surface 9 a of the support member 9, and the radiating fins 6 extend toward the support member 9 of the heat sink main body 2.
- the plasma actuator 17 is arranged such that the radiation fins 6 are closer to the heat sink main body 2. For this reason, the flow path of the main flow Mf formed between the adjacent radiation fins 6 is relatively close to the plasma actuator 17 that is the source of the induced flow If. Therefore, the control of the main flow Mf by the induced flow If can be more appropriately performed, and the cooling performance can be further improved.
- a plurality of radiating fins 6 are provided in a comb shape.
- the flow path of the induced flow If can be defined between the radiating fins 6 arranged in a comb shape, so that the arrangement interval and the size (the width in the Y-axis direction and the length in the X-axis direction) of each of the radiating fins 6 can be defined.
- a flow path of the induced flow If of a desired path can be formed on the second surface 2 b of the heat sink body 2.
- the heat sink main body 2 may be provided with one or a plurality of projecting radiation fins 6 formed on the heat sink body 2. That is, the radiation fins 6 may be formed in a projecting shape.
- the flow directions of the main flow Mf and the induced flow If can be changed as appropriate.
- heat transfer between the heat sink body 2 or the radiation fins 6 and the air layer 7 can be further promoted.
- the main flow Mf and the induced flow If are disturbed to generate a turbulent flow (three-dimensional flow), and the second surface 2b of the heat sink body 2 or the surface of the radiation fin 6 is generated.
- the development of the boundary layer (heat insulation layer) due to the decrease in the flow velocity around 6a can be suppressed.
- the plasma actuator 17 is arranged so as to guide the flow of the main flow Mf toward the heat sink body 2
- the plasma actuator 17 may be arranged so as to guide the flow of the main flow Mf toward the support member 9.
- a plasma actuator 17 may be employed as the induced flow generator 3 of the cooling device 10 described with reference to FIG.
- FIG. 14 is a cross-sectional view illustrating the configuration of the cooling device 10 according to the present embodiment.
- FIG. 15 is a cross-sectional view taken along line A-A ′ in FIG. 14.
- FIG. 16 is a perspective view of a region surrounded by a dotted line B in FIG.
- the cooling device 10 has protrusions 9b formed on the surface 9a of the support member 9 so as to face the respective radiation fins 6 on the basis of the configuration described in FIG. 12 or FIG. . Further, a dielectric 14 is provided between each radiation fin 6 and the projection 9b.
- the heat sink body 2 and each heat radiation fin 6 of the present embodiment are formed of a metal material, are connected to the ground potential, and function as the second electrode 13.
- the support member 9 is electrically connected to the power supply device 15 and functions as the first electrode 12.
- the power supply device 15 applies an AC voltage between the support member 9 and the heat sink body 2 and the radiation fins 6 to operate as the plasma actuator 17.
- an induced current If from the dielectric 14 toward the heat sink body 2 is generated in the air layer 7 from the dielectric 14 due to a voltage difference generated between the support member 9 and the heat sink body 2 and each heat radiation fin 6.
- the induced flow If that controls the flow of the main flow Mf in particular, the induced flow If that guides the flow of the main flow Mf toward the heat sink body 2 can be generated.
- the cooling device 10 employing the plasma actuator 17 described with reference to FIG.
- the first electrode 12 is formed on a heat sink (the heat sink body 2 and the radiation fins 6), and the second electrode 13 is formed on the support member 9.
- the first electrode 12 and the second electrode 13 of the plasma actuator 17 are formed integrally with the supporting member 9 and the heat sink, respectively, so that the induced flow If can be generated simply and at low cost without providing additional electrodes. This can realize a configuration for performing the above.
- the cooling device 10 of the present embodiment is configured such that the heat sink (the heat sink main body 2 and the radiation fins 6) is at the ground potential and the potential of the support member 9 is changed.
- modifications 4-1 to 4-7 of the fourth embodiment will be described.
- the following modifications 4-1 to 4-7 are appropriately selected in consideration of the required flow direction of the main flow Mf and the induced flow If, cooling performance, insulation performance, output performance of the fan 4, and pressure loss. This is an example of a specific configuration that can be performed.
- FIG. 17 is a perspective view of a main part of the cooling device 10 according to the modified example 4-1.
- the supporting member 9 is different from the configuration of the cooling device 10 described with reference to FIG. 9b is formed shorter than the extension region in the X-axis direction.
- the extension region in the X-axis direction of the surface portion of the support member 9 is formed to be about 1/5 to 1/6 of the extension region in the X-axis direction of the projection 9b.
- FIG. 18 is a perspective view of a main part of the cooling device 10 according to Modification Example 4-2.
- the cooling device 10 according to the present modification only the first and third projections 9b from the left side in the drawing of the support member 9 are different from the configuration of the cooling device 10 described in FIG. It is configured as the second electrode 13. With this configuration, the induced flow If can be caused to flow so as to draw a vortex between the adjacent radiation fins 6.
- FIG. 19 is a perspective view of a main part of a cooling device 10 according to Modification 4-3.
- the cooling device 10 according to the present modification further includes, in addition to the configuration of the cooling device 10 described with reference to FIG. A fan 4 is provided for generating.
- the main flow Mf can be brought to the heat sink main body 2 by the action of the induced flow If.
- the radiation fins 6 may be formed in a projection shape.
- FIG. 20 is a perspective view of a main part of a cooling device 10 according to Modification 4-4.
- the shapes of the protrusion 9b of the support member 9 and the dielectric 14 are also formed in a substantially columnar shape.
- the diameter of the substantially cylindrical shape applied to each of these members is configured to increase in the order of the radiation fin 6, the dielectric 14, and the protrusion 9b. With this configuration, it is possible to generate the induced flow If flowing along the peripheral region of the projection 9b of the support member 9 and downward (positive Z-axis direction) in the figure.
- FIG. 21 is a perspective view of a main part of a cooling device 10 according to Modification 4-5. As illustrated, in the cooling device 10 according to the present modification, a plurality of (three in FIG. 21) slit portions 9c are formed in the support member 9 in the configuration of the cooling device 10 described in FIG.
- the slits 9c are provided at positions facing the spaces between the adjacent radiation fins 6 in the support member 9, and extend along the X-axis direction on the surface of the support member 9. Further, the fan 4 is arranged to face the slit 9c in the negative Z-axis direction. With this configuration, the main flow Mf from the fan 4 flows toward the heat sink body 2 through the space between the adjacent radiation fins 6 through the slit 9c. Further, since the induced flow If flows from the projection 9b in the positive direction of the Z-axis, the main flow Mf can be accelerated by the induced flow If to increase the flow velocity.
- FIG. 22 is a perspective view of a main part of the cooling device 10 according to Modification 4-6.
- the cooling device 10 according to the present modification has a configuration in which the dielectric 14 is sandwiched between the projections 9b of the support member 9 based on the configuration of the cooling device 10 described with reference to FIG. With this configuration, the structure of the cooling device 10 can be further stabilized.
- FIG. 23 is a perspective view of a main part of a cooling device 10 according to Modification 4-7.
- FIG. 24 is a diagram showing a configuration of FIG. 23 viewed along the direction of arrow AR.
- the tip of each projection 9b is formed in a tapered shape based on the configuration of the cooling device 10 described with reference to FIG. With this configuration, the direction of the induced flow If generated from the projection 9b can be diffused, and the flow in the space between the radiation fins 6 can be made turbulent.
- FIG. 25 is a perspective view of a principal part explaining the configuration of the cooling device 10 according to the present embodiment.
- the heat sink main body 2 and each of the heat radiation fins 6 are electrically connected to the power supply device 15 and function as the first electrode 12.
- the support member 9 is connected to the ground potential and functions as the second electrode 13.
- the power supply device 15 applies an AC voltage between the heat sink body 2 and the radiating fins 6 and the support member 9, and these operate as the plasma actuator 17.
- an induced flow If from the dielectric 14 toward the surface 9a of the support member 9 is generated in the air layer 7 from the dielectric 14 due to the voltage difference generated between the heat sink body 2 and the radiation fins 6 and the support member 9.
- the configuration of the cooling device 10 of the present embodiment it is possible to generate the induced flow If that controls the flow of the main flow Mf, particularly the induced flow If that directs the flow of the main flow Mf to the surface 9a of the support member 9.
- the support member 9 is configured to be at the ground potential, and the potential of the heat sink (the heat sink body 2 and the radiation fins 6) is changed.
- the entire surface of the support member 9 (the side surface of the protrusion 9b) in contact with the heat sink can be covered with the dielectric. Therefore, insulation between the heat sink body 2 and the radiation fins 6 and the support member 9 can be suitably secured.
- the induced flow If flowing in the direction of the surface 9a of the support member 9 can be generated. Therefore, when the influence of the heat generated by the plasma actuator 17 cannot be ignored, the main flow Mf is transferred to the heat sink main body 2. And heat interference with the heating element 1 can be suppressed.
- modified examples 5-1 to 5-3 of the fifth embodiment are appropriately selected in consideration of the required flow direction of the main flow Mf and the induced flow If, cooling performance, insulation performance, output performance of the fan 4, and pressure loss. This is an example of a specific configuration that can be performed.
- FIG. 26 is a perspective view of a main part of the cooling device 10 according to the modified example 5-1.
- the cooling device 10 according to this modification is based on the configuration of the cooling device 10 described with reference to FIG. 25, but differs in the configuration of the dielectric 14.
- the dielectric 14 has a plate-like base 14 a that covers the entire surface 9 a of the support member 9, and protrusions 14 b that cover both side surfaces of the protrusion 9 b of the support member 9. Also according to this configuration, it is possible to generate the induced flow If that brings the flow of the main flow Mf to the surface 9a of the support member 9.
- FIG. 27 is a perspective view of a main part of a cooling device 10 according to Modification Example 5-2. As shown in the drawing, in the cooling device 10 according to the present modification, instead of the form of the radiation fin 6 of the cooling device 10 described with reference to FIG. ing.
- the projections 9b of the support member 9 and the dielectric 14 are also formed in a substantially cylindrical shape.
- the diameter of the substantially cylindrical shape applied to each of these members is configured to increase in the order of the radiation fin 6, the dielectric 14, and the protrusion 9b. With this configuration, it is possible to generate the induced flow If flowing along the peripheral area of the protrusion 9b of the support member 9 and flowing in the information on the drawing (the negative direction of the Z axis).
- FIG. 28 is a perspective view of a main part of a cooling device 10 according to Modification 5-3. As illustrated, in the cooling device 10 according to the present modification, a plurality of (three in FIG. 28) slit portions 9c are formed in the support member 9 in the configuration of the cooling device 10 described in FIG.
- the slits 9c are provided at positions facing the spaces between the adjacent radiation fins 6 in the support member 9, and extend along the X-axis direction on the surface of the support member 9. Further, in this modification, a suction fan 4 'is arranged to face the slit 9c in the negative Z-axis direction.
- a main flow Mf that flows from the heat sink main body 2 in the direction passing through the slit portion 9 c (the negative Z-axis direction) is generated in the space between the adjacent heat radiation fins 6. Further, since the induced flow If flows from the protrusion 9b in the negative Z-axis direction, the main flow Mf can be accelerated by the induced flow If to increase the flow velocity.
- the direction of the main flow Mf may be adjusted by disposing the fan 4' perpendicular to the induced flow If.
- the cooling device 10 described in FIGS. 16 and 17 the cooling devices 10 of the modified examples 3-1 and 3-2
- the example in which the fan 4 is disposed at the inlet 5a of the housing 5 has been described.
- a configuration may be adopted in which the fan 4 is disposed at the outlet 5b of the housing 5 and air is sucked from the outlet 5b by the operation of the fan 4.
- the heating element 1 is shown in a substantially square shape. However, a heating element 1 having a shape corresponding to the shape of an electronic component such as a coil and a capacitor which is assumed as the heating element 1 or another device requiring cooling can also be applied to the above embodiments. .
- the present invention is not limited thereto, and a plurality of induced flow generators 3 may be provided for one heating element 1, or a configuration in which one induced flow generator 3 is provided for a plurality of heating elements 1. .
- the induced flow generating device 3 a device other than the plasma actuator 17 described in the fourth embodiment can be used.
- the induced flow generating device 3 may be configured by another device that generates an air flow by an electric action such as a piezoelectric element.
- the mode in which the induced flow If is generated in a direction substantially orthogonal to or substantially parallel to the main flow Mf has been described.
- the direction of the induced flow If to be generated is not limited to this mode, and the induced flow If may be generated so as to form a predetermined angle with respect to the main flow Mf.
- the viewpoint of adjusting the flow direction of the main flow Mf or assisting the flow rate / flow velocity of the main flow Mf it is possible to appropriately adjust the direction in which the induced flow If is generated and the flow rate or the flow velocity of the induced flow If. .
- blower type fan 4 or the suction type fan 4 ′ was used as the mainstream generator.
- the mainstream generator another type of device may be employed as long as it has a function of promoting heat radiation from the heat sink to the air layer 7.
- a device that causes an airflow around the heat sink by natural stay may be employed instead of the fan 4 or the fan 4 ′.
- a heat spreader which is a member that promotes the diffusion of the heat, is interposed between the heat generating body 1 and the heat sink main body 2 from the viewpoint of more appropriately diffusing the heat from the heat generating body 1 in the heat sink main body 2. You may let it.
- Such a heat spreader can be formed of the same material as the heat sink body 2 or the radiation fin 6 or a different material.
- the heat spreader is preferably formed of a material having relatively high thermal conductivity such as copper, aluminum, and a carbon structure (such as carbon black or diamond). More preferably, the heat spreader is constructed from a relatively low cost material such as copper.
- the heat spreader can be more uniformly transmitted without being biased to a specific portion of the heat sink main body 2 or the heat radiation fin 6.
- a substantial heat transfer area between the heat sink body 2 or the radiation fins 6 and the main flow Mf and the induced flow If can be increased, and the heat transfer performance can be further improved.
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Abstract
Description
以下、第1実施形態について説明する。
図4は、変形例1−1による冷却装置10の断面図である。図示のように、本変形例1−1による冷却装置10では、誘起流Ifがヒートシンク本体2に向かって流れるように、誘起流発生装置3が誘起流発生部3aをZ軸負方向に向けた状態で支持部材9に設けられている。
図5は、変形例1−2による冷却装置10の断面図である。図示のように、本変形例1−2による冷却装置10では、誘起流発生装置3が発熱体1に対して主流Mfの流れ方向における下流(図5上においてX軸正方向側)に設けられている。
図6は、変形例1−3による冷却装置10の斜視図である。また、図7は、図6における支持部材9をZ軸正方向側から視た要部平面図である。図示のように、本変形例1−3による冷却装置10では、誘起流発生装置3が、誘起流発生部3aをY軸負方向に向けた状態で支持部材9の表面9aに設けられている。
以下、第2実施形態について説明する。なお、第1実施形態と同様の要素には同一の符号を付し、その説明を省略する。
図10及び図11は、変形例2−1による冷却装置10の構成を説明する断面図である。特に、図10には、ファン4が主流Mfを発生させているものの、プラズマアクチュエータ17をオフ状態(交流電圧を印加していない状態)とした場合の冷却装置10を示す。また、図10には、ファン4が主流Mfを発生させつつ、プラズマアクチュエータ17がオン状態(交流電圧を印加している状態)とした場合の冷却装置10を示す。
以下、第3実施形態について説明する。なお、第1実施形態又は第2実施形態と同様の要素には同一の符号を付し、その説明を省略する。
以下、第4実施形態について説明する。なお、第1実施形態~第3実施形態の何れかと同様の要素には同一の符号を付し、その説明を省略する。本実施形態では、誘起流発生装置3として図8で説明したプラズマアクチュエータ17を採用する冷却装置10の他の例について説明する。特に、本実施形態では、プラズマアクチュエータ17の第2電極13がヒートシンク(ヒートシンク本体2及び放熱フィン6)に構成され、第1電極12が支持部材9に構成される冷却装置10の態様について説明する。
図17は、変形例4−1による冷却装置10の要部斜視図である。図示のように、本変形例による冷却装置10では、図16で説明した冷却装置10の構成に対して、支持部材9は、その表面9aを構成する面部のX軸方向における伸長領域が、突起9bのX軸方向における伸長領域よりも短く形成される。具体的に、図17に示す例では、支持部材9の面部のX軸方向における伸長領域が、突起9bのX軸方向における伸長領域の1/5~1/6程度に形成される。この構成により、支持部材9の突起9bから図上の下方(Z軸正方向)に流れる誘起流Ifを生成することができる。
図18は、変形例4−2による冷却装置10の要部斜視図である。図示のように、本変形例による冷却装置10では、図17で説明した冷却装置10の構成に対して、支持部材9における図上の左側から1番目と3番目の突起9bの部分のみを、第2電極13として構成する。この構成により、誘起流Ifは、隣接する放熱フィン6の間で渦を描くように流すことができる。
図19は、変形例4−3による冷却装置10の要部斜視図である。図示のように、本変形例による冷却装置10は、図16で説明した冷却装置10の構成に加えて、さらに、隣接する放熱フィン6の間の空間において、X軸正方向に流れる主流Mfを発生するファン4が設けられている。この構成により、誘起流Ifの作用で主流Mfをヒートシンク本体2に寄せることができる。なお、放熱フィン6は突起状に形成しても良い。
図20は、変形例4−4による冷却装置10の要部斜視図である。図示のように、本変形例による冷却装置10では、図16で説明した冷却装置10の放熱フィン6の形態に代えて、略円柱形状の突起状の放熱フィン6が構成されている。また、支持部材9の突起9b及び誘電体14の形状も略円柱形状に形成される。なお、これら各部材にかかる略円柱形状の径は、放熱フィン6、誘電体14、及び突起9bの順に大きくなるように構成されている。この構成により、支持部材9の突起9bの周領域に沿ってから図上の下方(Z軸正方向)に流れる誘起流Ifを生成することができる。
図21は、変形例4−5による冷却装置10の要部斜視図である。図示のように、本変形例による冷却装置10では、図16で説明した冷却装置10の構成に対して、支持部材9に複数(図21では3つ)のスリット部9cが形成されている。
図22は、変形例4−6による冷却装置10の要部斜視図である。図示のように、本変形例による冷却装置10では、図16で説明した冷却装置10の構成をベースとして、支持部材9の各突起9bの間に誘電体14が挟持される構成をとる。この構成により、冷却装置10の構造をより安定させることができる。
図23は、変形例4−7による冷却装置10の要部斜視図である。また、図24は、図23を矢印ARの方向に沿って視た構成を示す図である。図示のように、本変形例による冷却装置10では、図22で説明した冷却装置10の構成をベースとして、各突起9bの先端が先細りのテーパ状に形成される。この構成により、突起9bから発生する誘起流Ifの方向を拡散させることができ、各放熱フィン6の間の空間における流れを乱流にすることができる。
以下、第5実施形態について説明する。なお、第1実施形態~第4実施形態の何れかと同様の要素には同一の符号を付し、その説明を省略する。本実施形態では、誘起流発生装置3として図8で説明したプラズマアクチュエータ17を採用する冷却装置10の他の例について説明する。特に、本実施形態では、プラズマアクチュエータ17の第1電極12がヒートシンク(ヒートシンク本体2及び放熱フィン6)に構成され、第2電極13が支持部材9に構成される冷却装置10の態様について説明する。
図26は、変形例5−1による冷却装置10の要部斜視図である。本変形例による冷却装置10では、図25で説明した冷却装置10の構成をベースとするが誘電体14の構成が異なる。具体的に、誘電体14は、支持部材9の表面9aの全面を覆う板状の基部14aと、支持部材9の突起9bの両側面を覆う突出部14bと、を有している。この構成によっても、主流Mfの流れを支持部材9の表面9aへ寄せる誘起流Ifを発生させることができる。
図27は、変形例5−2による冷却装置10の要部斜視図である。図示のように、図示のように、本変形例による冷却装置10では、図25で説明した冷却装置10の放熱フィン6の形態に代えて、略円柱形状の突起状の放熱フィン6が構成されている。
図28は、変形例5−3による冷却装置10の要部斜視図である。図示のように、本変形例による冷却装置10では、図25で説明した冷却装置10の構成に対して、支持部材9に複数(図28では3つ)のスリット部9cが形成されている。
Claims (20)
- 発熱体が接合されたヒートシンクと、
前記ヒートシンクを冷却する主流を発生させる主流発生装置と、
電気的に誘起流を発生させる誘起流発生装置と、を備え、
前記誘起流発生装置は、前記ヒートシンクに対向する支持部材に設けられた、
冷却装置。 - 請求項1に記載の冷却装置であって、
前記誘起流発生装置は、前記主流の流れを前記ヒートシンクに誘導する方向に前記誘起流を発生させるように配置される、
冷却装置。 - 請求項2に記載の冷却装置であって、
前記誘起流発生装置及び前記主流発生装置は、前記主流の流れ及び前記誘起流の流れが相互に略平行且つ略逆向きとなるように配置される、
冷却装置。 - 請求項2に記載の冷却装置であって、
前記誘起流発生装置は、前記誘起流の流れが前記支持部材から前記ヒートシンクへ向かう方向に対して略直交するように配置される、
冷却装置。 - 請求項1に記載の冷却装置であって、
前記誘起流発生装置は、前記主流の流れを前記支持部材に誘導する方向に前記誘起流を発生させるように配置される、
冷却装置。 - 請求項5に記載の冷却装置であって、
前記誘起流発生装置は、前記主流の流れに対して略平行且つ略同じ向きの前記誘起流を発生させるように配置される、
冷却装置。 - 請求項1に記載の冷却装置であって、
前記誘起流発生装置及び前記主流発生装置は、前記主流の流れ及び前記誘起流の流れが相互に略直交し、且つ前記誘起流の流れが前記ヒートシンクの面と略平行となるように配置される、
冷却装置。 - 請求項2~7の何れか1項に記載の冷却装置であって、
前記誘起流発生装置を少なくとも2つを備える、
冷却装置。 - 請求項1~8の何れか1項に記載の冷却装置であって、
前記誘起流発生装置は、第1電極及び第2電極の間に誘電体を介在させてなるプラズマアクチュエータを含む、
冷却装置。 - 請求項9に記載の冷却装置であって、
前記プラズマアクチュエータに印加する交流電圧の大きさ、及び周波数を制御する制御装置をさらに含む、
冷却装置。 - 請求項2~4の何れか1項に記載の冷却装置であって、
前記誘起流発生装置は、前記主流の流れ方向における前記発熱体の上流位置に配置された、
冷却装置。 - 請求項5又は6に記載の冷却装置であって、
前記誘起流発生装置は、前記主流の流れ方向における前記発熱体の下流位置に配置された、
冷却装置。 - 請求項1~12の何れか1項に記載の冷却装置であって、
前記ヒートシンクは、前記発熱体の接合面の裏面に設けられた放熱フィンをさらに含む、
冷却装置。 - 請求項13に記載の冷却装置であって、
前記放熱フィンは、櫛歯状に複数設けられた、
冷却装置。 - 請求項14に記載の冷却装置であって、
前記放熱フィンは、突起状に形成された、
冷却装置。 - 請求項1~15の何れか1項に記載の冷却装置であって、
前記支持部材は、前記ヒートシンクを囲う筐体の一部として構成される、
冷却装置。 - 請求項1~16の何れか1項に記載の冷却装置であって、
前記発熱体は、電子機器内に設けられた電子部品である、
冷却装置。 - 請求項9又は10に記載の冷却装置であって、
前記第1電極が前記ヒートシンクに構成され、
前記第2電極が前記支持部材に構成される、
冷却装置。 - 請求項18に記載の冷却装置であって、
前記ヒートシンクが接地電位となり、且つ前記支持部材の電位が変動するように構成された、
冷却装置。 - 請求項19に記載の冷却装置であって、
前記支持部材が接地電位となり、且つ前記ヒートシンクの電位が変動するように構成された、
冷却装置。
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CN201880098417.2A CN112805826A (zh) | 2018-10-05 | 2018-10-05 | 冷却装置 |
JP2020550928A JP7146934B2 (ja) | 2018-10-05 | 2018-10-05 | 冷却装置 |
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