US20120097381A1 - Heat sink - Google Patents
Heat sink Download PDFInfo
- Publication number
- US20120097381A1 US20120097381A1 US13/379,905 US201013379905A US2012097381A1 US 20120097381 A1 US20120097381 A1 US 20120097381A1 US 201013379905 A US201013379905 A US 201013379905A US 2012097381 A1 US2012097381 A1 US 2012097381A1
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- Prior art keywords
- passage
- coolant
- heat sink
- connecting passage
- height
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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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- 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
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
- H05K7/20254—Cold plates transferring heat from heat source to coolant
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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
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
-
- 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
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20927—Liquid coolant without phase change
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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 heat sink. More specifically, the present invention relates to a heat sink to be equipped in an inverter.
- a heat sink is a device to cool an object to be cooled such as electronic component.
- a water-cooled heat sink arranged to cause a cooling water to flow inside the heat sink is advantageous in capability of stable cooling, and insusceptibility to temperature in an apparatus, as compared to an air-cooled heat sink.
- FIG. 5 is an exploded perspective view showing a water-cooled heat sink disclosed in a patent document 1.
- This water-cooled heat sink 20 includes a middle plate of metallic material, shaped in the form of a flat plate having an open portion 19 , and sandwiched between an upper plate 12 and a lower plate 14 so as to form a fluid passage for a cooling water.
- Inner fins 15 , 16 and 17 are disposed in the open portion 19 of the middle plate 13 .
- Upper plate 12 is adapted to be provided with a component (not shown) to be cooled.
- the component is cooled by transfer of heat of the component, through upper plate 12 and inner fins 15 , 16 and 17 , to the cooling water of a lower temperature for heat exchange.
- Patent Document 1 JP 2008-235725 A.
- the cooling efficiency of the water-cooled heat sink becomes lower when the cooling water is unable to flow smoothly, and when the flow of the cooling water is deviated.
- the flow of the cooling water is not smooth near a parting portion 22 in a U turn portion of the fluid passage of heat sink 20 , and the pressure loss becomes great in the U turn portion.
- the water-cooled heat sink 20 of the patent document 1 is formed to have a structure including stepwise guide grooves or recesses 23 , 24 formed in the U turn portion where the cooling water turns so that the cooling water can flow smoothly and easily into the inner fin 16 near the parting portion 22 .
- This structure can improve the heat exchange efficiency of the inner fin 16 by causing the cooling water to flow uniformly into the inner fin 16 .
- the U turn portion is shaped to have an end portion 21 projecting or bulging outwards so as to ensure a depth or length, and thereby to reduce the pressure loss.
- a height of a fluid passage of the connecting passage on an inflow side to which a coolant flows in is made greater than a height of the coolant passage connected with the fluid passage on the inflow side;
- the invention as mentioned above can contributes to improvement of the cooling efficiency of the water-cooled heat sink without increasing the size of the heat sink.
- FIG. 1 is a perspective view of a heat sink according to embodiments of the present invention.
- FIG. 2A is a top view of a heat sink according to an embodiment 1 of the present invention.
- FIG. 2B is an A-A sectional view of the heat sink according to the embodiment 1 of the present invention.
- FIG. 2C is a B-B sectional view of the heat sink according to the embodiment 1 of the present invention.
- FIG. 2D is a C-C sectional view of the heat sink according to the embodiment 1 of the present invention.
- FIG. 3A is a top view of a heat sink according to an embodiment 2 of the present invention.
- FIG. 3B is an A-A sectional view of the heat sink according to the embodiment 2 of the present invention.
- FIG. 3C is a B-B sectional view of the heat sink according to the embodiment 2 of the present invention.
- FIG. 3D is a C-C sectional view of the heat sink according to the embodiment 2 of the present invention.
- FIG. 4 is a top view of the heat sink provided with a fin according to the embodiment 1 of the present invention.
- FIG. 5 is an exploded perspective view of a water-cooled heat sink according to an earlier technology.
- FIG. 6 is an enlarged view showing a U turn portion of the water-cooled heat sink having a U-shaped fluid passage according to the earlier technology.
- the present invention relates to a heat sink which comprises a plurality of coolant passages and a connecting passage connecting the coolant passages nonlinearly.
- a heat sink according to the present invention is configured to restrain the pressure loss in the connecting passage by setting a height of a fluid passage of the connecting passage on an inflow side to which a coolant flows in, greater than a height of the coolant passage causing the coolant to flow into the connecting passage.
- the arrangement making greater the height of the connecting passage on the inflow side to which a coolant flows in is effective for eliminating the need for increasing the width (depth) of the fluid passage, and avoiding a size increase of the heat sink.
- the height of the fluid passage of the connecting passage is decreased gradually to an end portion of the connecting passage on an outflow side from which the coolant flows out from the connecting passage. Therefore, it is possible to cause the coolant to flow uniformly from the connecting passage to the coolant passage connected on the downstream side of the connecting passage.
- the thus-constructed heat sink according to the present invention can improve the cooling efficiency without increasing the size of the heat sink.
- the following embodiments of the present invention relate to water-cooled heat sing.
- the coolant according to the present invention is not limited to water.
- FIGS. 2A ⁇ 2D The following is detailed explanation on a water-cooled heat sink according to an embodiment 1 of the present invention with reference to FIG. 1 and FIG. 2 ( FIGS. 2A ⁇ 2D ).
- the water-cooled heat sink 1 has a structure including a coolant passage 2 and a coolant passage 3 which are connected in the U-shaped form by a connecting passage 4 .
- a parting portion 7 is formed by the coolant passage 2 and 3 and connecting passage 4 connected in the U-shaped form.
- One end of the coolant passage 2 is connected with the connecting passage 4 to communicate with the coolant passage 2 .
- the other end of the coolant passage 2 is connected with a coolant inlet pipe or piping 5 .
- One end of the coolant passage 3 is connected with an outflow side end of the connecting passage 4 from which the coolant flows out from the connecting passage 4 .
- the other end of the coolant passage 3 not connected with the connecting passage 4 is connected with a coolant outlet pipe or piping 6 .
- the coolant passages 2 and 3 are in the form of a plate like tubular member.
- the shape of the coolant passage 2 and 3 according to the present invention is not limited to this, and it is possible to employ an appropriate tubular form.
- coolant passage 3 It is optional to connect another heat sink 1 or another coolant passage by connecting a connecting passage similar, in shape to the connecting passage 4 , with the end of the coolant passage 3 .
- the coolant passage 3 is arranged in parallel to the coolant passage 2 in the same plane. However, it is possible to set the position of the coolant passage 3 arbitrarily.
- a component 8 to be cooled is disposed near the heat sink 1 so that heat is transferred from the component 8 to the cooling water flowing in the coolant passage 2 or 3 to exchange heat.
- the cooling water used for the heat exchange flows from the inlet pipe 5 into the coolant passage 2 , flows, through the connecting passage 4 and the coolant passage 3 , and flows to the outside from the outlet pipe 6 .
- the fluid passage height, or the height of the fluid passage, of the connecting passage 4 on the inflow side or upstream side to which the cooling water flows in is set higher than the height of the coolant passage 2 .
- the height of the fluid passage of the connecting passage 4 on the inflow side to which the cooling water flows in is increased gradually from a connection portion 4 a between the connecting passage 4 and the coolant passage 2 .
- the fluid passage height, or the height of the fluid passage, of the coolant passage 2 is increased gradually toward the connecting passage 4 .
- the flow speed of the cooling water flowing from the coolant passage 2 into the connecting passage 4 becomes constant or uniform between the left side and right side of the fluid passage if the height of the passage of the connecting passage 4 is increased so as to equalize the height in a widthwise direction of the fluid passage from the connection portion 4 a between the connecting passage 4 and the coolant passage 2 .
- the flow speed of the cooling water flowing in the coolant passage 2 becomes constant or uniform between the left side and right side of the fluid passage if the height of the fluid passage of the coolant passage 2 is increased so as to equalize the height in a widthwise direction of the fluid passage to the connection portion 4 a between the connecting passage 4 and the coolant passage 2 . Therefore, this configuration can restrain the pressure loss in the connecting passage 4 , and cause the cooling water to flow uniformly in the coolant passage 2 .
- the component 8 to be cooled is disposed as shown in FIG. 2B and FIG. 2C . Therefore, the arrangement in which the connecting passage 4 is enlarged in the heightwise direction does not prevent the size reduction of the heat sink 1 .
- the passage height of the connecting passage 4 is decreased from a middle portion 4 b in the flow direction of the connecting passage 4 , to a downstream end 4 c from which the cooling water flows out.
- the position from which the height of the connecting passage 4 is decreased is not limited to the middle portion 4 b, but the position can be set at any point in the longitudinal direction of the connecting passage 4 from the coolant passage 2 to the coolant passage 3 .
- the connecting passage 4 narrowed in this way is effective for equalizing the pressure loss in the fluid passage from the middle portion 4 b in the flow direction in the connecting passage 4 , to the end portion 4 c on the outflow side from which the cooling water flows out, and for uniformizing the flow of the cooling water flowing into the coolant passage 3 .
- the shape of the connecting passage 4 is not limited to the examples of this embodiment. It is optional to set the shape appropriately to uniformize the flow of the cooling water flowing into the coolant passage 3 .
- the flow of the cooling water flowing from the connecting passage 4 into the coolant passage 3 is difficult and not smooth near the parting portion 7 in the coolant passage 3 because of momentum of the cooling water flowing from the connecting passage 4 .
- the flow of the cooling water in the coolant passage 3 is uniformized by setting the shape of the fluid passage so as to equalize the pressure loss in the fluid passage from the middle portion 4 b of the connecting passage 4 in the flow direction toward the end portion 4 c on the outflow side from which the cooling water flows out of the connecting passage 4 .
- a heat sink according to an embodiment 2 of the present invention is different in the shape of the fluid passage of the connecting passage from the heat sink 1 according to the embodiment 1.
- Components of the heat sink according to the embodiment 2 similar to the corresponding components in the heat sink of the embodiment 1 are given the same reference numerals, and detailed explanation is omitted and not repeated.
- a water-cooled heat sink 10 As shown in FIG. 3A , a water-cooled heat sink 10 according to the embodiment 2 of the present invention has a structure including a coolant passage 2 and a coolant passage 3 which are connected in the U-shaped form by a connecting passage 11 .
- a parting portion 7 is formed by the coolant passage 2 and 3 and connecting passage 11 connected in the U-shaped form.
- One end of the coolant passage 2 is connected with the connecting passage 11 to communicate with the coolant passage 2 .
- the other end of the coolant passage 2 is connected with a coolant inlet pipe or piping 5 .
- One end of the coolant passage 3 is connected with the fluid passage of the connecting passage 11 on an outflow side from which the coolant flows out from the connecting passage 11 .
- the other end of the coolant passage 3 not connected with the connecting passage 4 is connected with a coolant outlet pipe or piping 6 .
- coolant passage 3 It is optional to connect another heat sink or another coolant passage by connecting a connecting passage similar in shape to the connecting passage 11 , with the end of the coolant passage 3 .
- the coolant passage 3 is arranged in parallel to the coolant passage 2 in the same plane. However, it is possible to set the position of the coolant passage 3 arbitrarily.
- a component 8 to be cooled is disposed near the heat sink 10 so that heat is transferred from the component 8 to the cooling water flowing in the coolant passage 2 or 3 to exchange heat.
- the cooling water used for the heat exchange flows from the inlet pipe 5 into the coolant passage 2 , flows, through the connecting passage 4 and the coolant passage 3 , and flows to the outside from the outlet pipe 6 .
- the height of the connecting passage 11 on the inflow side or upstream side to which the cooling water flows in is set higher than the height of the coolant passage 2 .
- the height of the connecting passage 11 on the inflow side to which the cooling water flows in is increased gradually from a connection portion 11 b between the connecting passage 11 and the coolant passage 2 .
- the height of the coolant passage 2 is increased gradually toward the connecting passage 11 .
- the connecting passage 11 is enlarged in the heightwise direction is not harmful to the size reduction of the heat sink 10 .
- the height of the connecting passage 11 is increased so as to equalize the height in a widthwise direction (a direction of an arrow E shown in FIG. 3C ), and at the same time the fluid passage of the connecting passage 11 lying on an extension of the coolant passage 2 is formed so as to curve upwards in the heightwise direction of the connecting passage 11 .
- the cross section of this fluid passage is substantially equal to the cross section of the fluid passage of the coolant passage 2 .
- This configuration can made constant or uniform, the flow speed of the cooling water flowing from the coolant passage 2 up to the upper end 11 a of the connecting passage 1 , and cause the cooling water to flow uniformly in the connecting passage 11 .
- the height of the fluid passage of the connecting passage 11 is decreased from a middle portion 11 c in the flow direction of the connecting passage 11 , to a downstream end 11 d on the outflow side from which the cooling water flows out.
- the position from which the fluid passage height of the connecting passage 4 is decreased is not limited to the middle portion 11 c, but the position can be set at any point in the longitudinal direction of the connecting passage 11 from the coolant passage 2 to the coolant passage 3 .
- the connecting passage 11 narrowed in this way is effective for equalizing the pressure loss in the fluid passage from the middle portion 11 c in the flow direction in the connecting passage 11 , to the end portion 11 d on the outflow side from which the cooling water flows out, and for uniformizing the flow of the cooling water flowing into the coolant passage 3 .
- the shape of the connecting passage 11 is not limited to the example of this embodiment. It is optional to set the shape appropriately to uniformize the flow of the cooling water flowing into the coolant passage 3 .
- the flow of the cooling water in the coolant passage 3 is uniformized by setting the shape of the fluid passage so as to equalize the pressure loss in the fluid passage in the flow direction from the middle portion 11 c of the connecting passage 11 toward the end portion 11 d on the outflow side from which the cooling water flows out of the connecting passage 4 .
- the heat sink according to the present invention can restrain the pressure loss of the coolant flowing in the heat sink and cause the coolant to flow uniformly in a coolant passage. Therefore, the heat sink can improve the cooling efficiency of the heat sink. Moreover, the heat sink can restrain an increase of the volume in the depthwise direction (the depth of the U turn portion of the coolant passage in the heat sink) as much as possible, and enable compactification of the heat sink. Therefore, it is possible to obtain a heat sink which is uniform in temperature distribution, smaller in required space and low in pressure loss.
- the present invention relates to fluid passage or passages conveying a coolant of the heat sink. Variation and modification of the construction are possible in the range in which the effect(s) of the present invention is not impaired. For example, it is possible to form a heat signal having fluid passages similar to the coolant passages 2 and 3 and the connecting passage 4 , by partitioning the inside of a tubular member.
- a plurality of fins 9 if formed in or on fluid passages of the coolant passages 2 and 3 and the connecting passage 4 , are effective for improving the cooling efficiency, by transferring heat from the component to be cooled through the fins 9 to the coolant.
- the geometry of the connecting passage in the heat sink according to the present invention is not limited to the U turn shape as in the embodiments, but applicable to portions where the direction of the flow of the coolant is changed.
- the coolant passages and the connecting passage may be prepared as separate members or may be integral parts of an integral member of the coolant passages and the connecting passage.
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- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
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- Condensed Matter Physics & Semiconductors (AREA)
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Abstract
[Task] To improve the cooling efficiency of a heat sink without increasing the size of the heat sink.
[Means for solution] A heat sink 1 includes a plurality of coolant passage 2, 3, and a connecting passage 4 connecting the coolant passages 2, 3 nonlinearly. A height of a fluid passage of the connecting passage 4 on an inflow side to which the coolant flows in is made greater than a height of the coolant passage 2 connected with the fluid passage on the inflow side. On the other hand, the height of the fluid passage of the connecting passage 4 is decreased to an end portion of the connecting passage 4 on an outflow side from which a cooling water flows out. In increasing the height of the fluid passage of the connecting passage 4 on the inflow side to which the cooling water flows in, gradually, the height of the connecting passage 4 is increased so as to equalize the height of a widthwise direction of the fluid passage of the coolant passage 2.
Description
- The present invention relates to a heat sink. More specifically, the present invention relates to a heat sink to be equipped in an inverter.
- A heat sink is a device to cool an object to be cooled such as electronic component. Specifically, a water-cooled heat sink arranged to cause a cooling water to flow inside the heat sink is advantageous in capability of stable cooling, and insusceptibility to temperature in an apparatus, as compared to an air-cooled heat sink.
-
FIG. 5 is an exploded perspective view showing a water-cooled heat sink disclosed in apatent document 1. - This water-cooled
heat sink 20 includes a middle plate of metallic material, shaped in the form of a flat plate having anopen portion 19, and sandwiched between anupper plate 12 and alower plate 14 so as to form a fluid passage for a cooling water.Inner fins open portion 19 of themiddle plate 13. -
Upper plate 12 is adapted to be provided with a component (not shown) to be cooled. The component is cooled by transfer of heat of the component, throughupper plate 12 andinner fins - Patent Document 1: JP 2008-235725 A.
- In the heat sink to cool a component to be cooled by circulating a cooling water, the cooling efficiency of the water-cooled heat sink becomes lower when the cooling water is unable to flow smoothly, and when the flow of the cooling water is deviated.
- In the example of the water-cooled
heat sink 20 of thepatent document 1, as shown inFIG. 5 , the flow of the cooling water is not smooth near aparting portion 22 in a U turn portion of the fluid passage ofheat sink 20, and the pressure loss becomes great in the U turn portion. - Therefore, as shown in
FIG. 6 , the water-cooledheat sink 20 of thepatent document 1 is formed to have a structure including stepwise guide grooves orrecesses inner fin 16 near theparting portion 22. This structure can improve the heat exchange efficiency of theinner fin 16 by causing the cooling water to flow uniformly into theinner fin 16. - Moreover, in the
patent document 1, as shown inFIG. 6 , the U turn portion is shaped to have anend portion 21 projecting or bulging outwards so as to ensure a depth or length, and thereby to reduce the pressure loss. - However, the expansion of the volume of the fluid passage of the water-cooled heat sink in the depthwise or lengthwise direction is disadvantageous to the size reduction of the water-cooled heat sink.
- Therefore, in a heat sink according to the present invention comprising a plurality of coolant passages and a connecting passage connecting the coolant passages nonlinearly, a height of a fluid passage of the connecting passage on an inflow side to which a coolant flows in is made greater than a height of the coolant passage connected with the fluid passage on the inflow side; and
- wherein the height of the fluid passage of the connecting passage is decreased to an end portion of the connecting passage on an outflow side from which the coolant flows out from the connecting passage.
- The invention as mentioned above can contributes to improvement of the cooling efficiency of the water-cooled heat sink without increasing the size of the heat sink.
-
FIG. 1 is a perspective view of a heat sink according to embodiments of the present invention. -
FIG. 2A is a top view of a heat sink according to anembodiment 1 of the present invention.FIG. 2B is an A-A sectional view of the heat sink according to theembodiment 1 of the present invention.FIG. 2C is a B-B sectional view of the heat sink according to theembodiment 1 of the present invention.FIG. 2D is a C-C sectional view of the heat sink according to theembodiment 1 of the present invention. -
FIG. 3A is a top view of a heat sink according to anembodiment 2 of the present invention.FIG. 3B is an A-A sectional view of the heat sink according to theembodiment 2 of the present invention.FIG. 3C is a B-B sectional view of the heat sink according to theembodiment 2 of the present invention.FIG. 3D is a C-C sectional view of the heat sink according to theembodiment 2 of the present invention. -
FIG. 4 is a top view of the heat sink provided with a fin according to theembodiment 1 of the present invention. -
FIG. 5 is an exploded perspective view of a water-cooled heat sink according to an earlier technology. -
FIG. 6 is an enlarged view showing a U turn portion of the water-cooled heat sink having a U-shaped fluid passage according to the earlier technology. - The present invention relates to a heat sink which comprises a plurality of coolant passages and a connecting passage connecting the coolant passages nonlinearly.
- A heat sink according to the present invention is configured to restrain the pressure loss in the connecting passage by setting a height of a fluid passage of the connecting passage on an inflow side to which a coolant flows in, greater than a height of the coolant passage causing the coolant to flow into the connecting passage.
- In this way, the arrangement making greater the height of the connecting passage on the inflow side to which a coolant flows in, is effective for eliminating the need for increasing the width (depth) of the fluid passage, and avoiding a size increase of the heat sink.
- Moreover, the height of the fluid passage of the connecting passage is decreased gradually to an end portion of the connecting passage on an outflow side from which the coolant flows out from the connecting passage. Therefore, it is possible to cause the coolant to flow uniformly from the connecting passage to the coolant passage connected on the downstream side of the connecting passage.
- The thus-constructed heat sink according to the present invention can improve the cooling efficiency without increasing the size of the heat sink. The following embodiments of the present invention relate to water-cooled heat sing. However, the coolant according to the present invention is not limited to water.
- The following is detailed explanation on a water-cooled heat sink according to an
embodiment 1 of the present invention with reference toFIG. 1 andFIG. 2 (FIGS. 2A˜2D ). - As shown in
FIG. 1 , the water-cooledheat sink 1 according to theembodiment 1 of the present invention has a structure including acoolant passage 2 and acoolant passage 3 which are connected in the U-shaped form by a connectingpassage 4. Aparting portion 7 is formed by thecoolant passage passage 4 connected in the U-shaped form. - One end of the
coolant passage 2 is connected with the connectingpassage 4 to communicate with thecoolant passage 2. The other end of thecoolant passage 2 is connected with a coolant inlet pipe orpiping 5. - One end of the
coolant passage 3 is connected with an outflow side end of the connectingpassage 4 from which the coolant flows out from theconnecting passage 4. The other end of thecoolant passage 3 not connected with the connectingpassage 4 is connected with a coolant outlet pipe orpiping 6. - In
FIG. 1 , thecoolant passages coolant passage - It is optional to connect another
heat sink 1 or another coolant passage by connecting a connecting passage similar, in shape to the connectingpassage 4, with the end of thecoolant passage 3. In this example, thecoolant passage 3 is arranged in parallel to thecoolant passage 2 in the same plane. However, it is possible to set the position of thecoolant passage 3 arbitrarily. - As shown in
FIG. 2B , acomponent 8 to be cooled is disposed near theheat sink 1 so that heat is transferred from thecomponent 8 to the cooling water flowing in thecoolant passage FIG. 2A , the cooling water used for the heat exchange flows from theinlet pipe 5 into thecoolant passage 2, flows, through the connectingpassage 4 and thecoolant passage 3, and flows to the outside from theoutlet pipe 6. - As shown in
FIG. 2B , the fluid passage height, or the height of the fluid passage, of the connectingpassage 4 on the inflow side or upstream side to which the cooling water flows in is set higher than the height of thecoolant passage 2. As shown, the height of the fluid passage of the connectingpassage 4 on the inflow side to which the cooling water flows in is increased gradually from aconnection portion 4 a between the connectingpassage 4 and thecoolant passage 2. In the vicinity of the connectingpassage 4, the fluid passage height, or the height of the fluid passage, of thecoolant passage 2 is increased gradually toward the connectingpassage 4. - In forming the connecting
passage 4 so that the height of the fluid passage of the connectingpassage 4 is increased gradually on the cooling water inflow side, the flow speed of the cooling water flowing from thecoolant passage 2 into the connectingpassage 4 becomes constant or uniform between the left side and right side of the fluid passage if the height of the passage of the connectingpassage 4 is increased so as to equalize the height in a widthwise direction of the fluid passage from theconnection portion 4 a between the connectingpassage 4 and thecoolant passage 2. Similarly, in forming thecoolant passage 2 so that the height of the fluid passage of thecoolant passage 2 is increased gradually, the flow speed of the cooling water flowing in thecoolant passage 2 becomes constant or uniform between the left side and right side of the fluid passage if the height of the fluid passage of thecoolant passage 2 is increased so as to equalize the height in a widthwise direction of the fluid passage to theconnection portion 4 a between the connectingpassage 4 and thecoolant passage 2. Therefore, this configuration can restrain the pressure loss in the connectingpassage 4, and cause the cooling water to flow uniformly in thecoolant passage 2. - On the upper surface of the
coolant passage 2, thecomponent 8 to be cooled is disposed as shown inFIG. 2B andFIG. 2C . Therefore, the arrangement in which the connectingpassage 4 is enlarged in the heightwise direction does not prevent the size reduction of theheat sink 1. - Moreover, as shown in
FIG. 2D , the passage height of the connectingpassage 4 is decreased from amiddle portion 4 b in the flow direction of the connectingpassage 4, to adownstream end 4 c from which the cooling water flows out. The position from which the height of the connectingpassage 4 is decreased is not limited to themiddle portion 4 b, but the position can be set at any point in the longitudinal direction of the connectingpassage 4 from thecoolant passage 2 to thecoolant passage 3. The connectingpassage 4 narrowed in this way is effective for equalizing the pressure loss in the fluid passage from themiddle portion 4 b in the flow direction in the connectingpassage 4, to theend portion 4 c on the outflow side from which the cooling water flows out, and for uniformizing the flow of the cooling water flowing into thecoolant passage 3. - In forming the connecting
passage 4 so as to decrease the height of the fluid passage of the connectingpassage 4, the shape of the connectingpassage 4 is not limited to the examples of this embodiment. It is optional to set the shape appropriately to uniformize the flow of the cooling water flowing into thecoolant passage 3. The flow of the cooling water flowing from the connectingpassage 4 into thecoolant passage 3 is difficult and not smooth near theparting portion 7 in thecoolant passage 3 because of momentum of the cooling water flowing from the connectingpassage 4. Accordingly, the flow of the cooling water in thecoolant passage 3 is uniformized by setting the shape of the fluid passage so as to equalize the pressure loss in the fluid passage from themiddle portion 4 b of the connectingpassage 4 in the flow direction toward theend portion 4 c on the outflow side from which the cooling water flows out of the connectingpassage 4. - A heat sink according to an
embodiment 2 of the present invention is different in the shape of the fluid passage of the connecting passage from theheat sink 1 according to theembodiment 1. Components of the heat sink according to theembodiment 2 similar to the corresponding components in the heat sink of theembodiment 1 are given the same reference numerals, and detailed explanation is omitted and not repeated. - As shown in
FIG. 3A , a water-cooledheat sink 10 according to theembodiment 2 of the present invention has a structure including acoolant passage 2 and acoolant passage 3 which are connected in the U-shaped form by a connectingpassage 11. Aparting portion 7 is formed by thecoolant passage passage 11 connected in the U-shaped form. - One end of the
coolant passage 2 is connected with the connectingpassage 11 to communicate with thecoolant passage 2. The other end of thecoolant passage 2 is connected with a coolant inlet pipe orpiping 5. - One end of the
coolant passage 3 is connected with the fluid passage of the connectingpassage 11 on an outflow side from which the coolant flows out from the connectingpassage 11. The other end of thecoolant passage 3 not connected with the connectingpassage 4 is connected with a coolant outlet pipe orpiping 6. - It is optional to connect another heat sink or another coolant passage by connecting a connecting passage similar in shape to the connecting
passage 11, with the end of thecoolant passage 3. In this example, thecoolant passage 3 is arranged in parallel to thecoolant passage 2 in the same plane. However, it is possible to set the position of thecoolant passage 3 arbitrarily. - As shown in
FIG. 3B , acomponent 8 to be cooled is disposed near theheat sink 10 so that heat is transferred from thecomponent 8 to the cooling water flowing in thecoolant passage FIG. 3A , the cooling water used for the heat exchange flows from theinlet pipe 5 into thecoolant passage 2, flows, through the connectingpassage 4 and thecoolant passage 3, and flows to the outside from theoutlet pipe 6. - As shown in
FIG. 3B , the height of the connectingpassage 11 on the inflow side or upstream side to which the cooling water flows in is set higher than the height of thecoolant passage 2. As shown, the height of the connectingpassage 11 on the inflow side to which the cooling water flows in is increased gradually from aconnection portion 11 b between the connectingpassage 11 and thecoolant passage 2. In the vicinity of the connectingpassage 11, the height of thecoolant passage 2 is increased gradually toward the connectingpassage 11. - On the upper surface of the
coolant passage 2, thecomponent 8 to be cooled is disposed. Therefore, the arrangement in which the connectingpassage 11 is enlarged in the heightwise direction is not harmful to the size reduction of theheat sink 10. - In forming the connecting
passage 11 so that the height of the connectingpassage 11 is increased gradually on the cooling water inflow side, the height of the connectingpassage 11 is increased so as to equalize the height in a widthwise direction (a direction of an arrow E shown inFIG. 3C ), and at the same time the fluid passage of the connectingpassage 11 lying on an extension of thecoolant passage 2 is formed so as to curve upwards in the heightwise direction of the connectingpassage 11. From aconnection portion 11 b between thecoolant passage 2 and the connectingpassage 11 to anupper end 11 a of the connectingpassage 11 to which the cooling water impinges, the cross section of this fluid passage is substantially equal to the cross section of the fluid passage of thecoolant passage 2. This configuration can made constant or uniform, the flow speed of the cooling water flowing from thecoolant passage 2 up to theupper end 11 a of the connectingpassage 1, and cause the cooling water to flow uniformly in the connectingpassage 11. - Moreover, as shown in
FIG. 3D , the height of the fluid passage of the connectingpassage 11 is decreased from amiddle portion 11 c in the flow direction of the connectingpassage 11, to adownstream end 11 d on the outflow side from which the cooling water flows out. The position from which the fluid passage height of the connectingpassage 4 is decreased is not limited to themiddle portion 11 c, but the position can be set at any point in the longitudinal direction of the connectingpassage 11 from thecoolant passage 2 to thecoolant passage 3. The connectingpassage 11 narrowed in this way is effective for equalizing the pressure loss in the fluid passage from themiddle portion 11 c in the flow direction in the connectingpassage 11, to theend portion 11 d on the outflow side from which the cooling water flows out, and for uniformizing the flow of the cooling water flowing into thecoolant passage 3. - The shape of the connecting
passage 11 is not limited to the example of this embodiment. It is optional to set the shape appropriately to uniformize the flow of the cooling water flowing into thecoolant passage 3. The flow of the cooling water in thecoolant passage 3 is uniformized by setting the shape of the fluid passage so as to equalize the pressure loss in the fluid passage in the flow direction from themiddle portion 11 c of the connectingpassage 11 toward theend portion 11 d on the outflow side from which the cooling water flows out of the connectingpassage 4. - As explained in detail above by the use of the
embodiments - The present invention relates to fluid passage or passages conveying a coolant of the heat sink. Variation and modification of the construction are possible in the range in which the effect(s) of the present invention is not impaired. For example, it is possible to form a heat signal having fluid passages similar to the
coolant passages passage 4, by partitioning the inside of a tubular member. - Furthermore, as shown in
FIG. 4 , a plurality offins 9, if formed in or on fluid passages of thecoolant passages passage 4, are effective for improving the cooling efficiency, by transferring heat from the component to be cooled through thefins 9 to the coolant. - The geometry of the connecting passage in the heat sink according to the present invention is not limited to the U turn shape as in the embodiments, but applicable to portions where the direction of the flow of the coolant is changed. The coolant passages and the connecting passage may be prepared as separate members or may be integral parts of an integral member of the coolant passages and the connecting passage.
-
- 1, 10 . . . heat sink
- 2, 3 . . . coolant passages
- 4, 11 . . . connecting passage
- 7 . . . parting portion
- 8 . . . component to be cooled
- 9 . . . fin
Claims (6)
1-5. (canceled)
6. A heat sink comprising:
two or more coolant passages arranged nonlinearly to convey a coolant for heat exchange with a heat of a component to be cooled; and
a connecting passage connecting the coolant passages;
wherein a fluid passage of the connecting passage on an inflow side to which a coolant flows in is enlarged in a direction of a height of a cross section, as compared with the coolant passage connected with the fluid passage on the inflow side; and
the fluid passage of the connecting passage is decreased in size in the direction of the height of the cross section toward an end portion of the connecting passage on an outflow side from which the coolant flows out from the connecting passage.
7. The heat sink as recited in claim 6 , wherein the height of the cross section of the fluid passage of the connecting passage on the inflow side to which the coolant flows in is increased gradually from a connection portion between the connecting passage and the coolant passage connected with the fluid passage on the inflow side.
8. The heat sink as recited in claim 6 , wherein the fluid passage of the connecting passage located on an extension of the coolant passage connected with the fluid passage on the inflow side is made substantially equal in cross section to the coolant passage connected with the fluid passage on the inflow side, and curved in a direction of a height of the cross section of the connecting passage.
9. The heat sink as recited in claim 6 , wherein the coolant passage connected with the fluid passage on the inflow side and the coolant passage connected with the fluid passage of the connecting passage on an outflow side from which the coolant flow out from the connecting passage are arranged in parallel to each other.
10. The heat sink as recited in claim 6 , wherein the coolant passages are arranged so that the component to be cooled is provided on an upper surface of each of the coolant passages.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009147138 | 2009-06-22 | ||
JP2009-147138 | 2009-06-22 | ||
PCT/JP2010/060477 WO2010150747A1 (en) | 2009-06-22 | 2010-06-21 | Heat sink |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120097381A1 true US20120097381A1 (en) | 2012-04-26 |
Family
ID=43386516
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/379,905 Abandoned US20120097381A1 (en) | 2009-06-22 | 2010-06-21 | Heat sink |
Country Status (5)
Country | Link |
---|---|
US (1) | US20120097381A1 (en) |
JP (1) | JP5488599B2 (en) |
CN (1) | CN102804369B (en) |
DE (1) | DE112010002307T5 (en) |
WO (1) | WO2010150747A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150034280A1 (en) * | 2013-08-01 | 2015-02-05 | Hamilton Sundstrand Corporation | Header for electronic cooler |
EP3296649A4 (en) * | 2015-08-28 | 2018-05-30 | Mitsubishi Heavy Industries Thermal Systems, Ltd. | Air conditioning device |
EP3550246A1 (en) * | 2018-04-03 | 2019-10-09 | Aavid Thermalloy, LLC | Wrap around heat exchanger |
EP4311384A1 (en) * | 2022-07-22 | 2024-01-24 | Aptiv Technologies Limited | Cooling system with flow guiding element |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016076641A (en) * | 2014-10-08 | 2016-05-12 | カルソニックカンセイ株式会社 | Semiconductor cooling device |
CN110383470B (en) | 2017-03-16 | 2023-05-09 | 三菱电机株式会社 | Cooling system |
JP6663899B2 (en) * | 2017-11-29 | 2020-03-13 | 本田技研工業株式会社 | Cooling system |
CN111447805A (en) * | 2020-05-11 | 2020-07-24 | 珠海格力电器股份有限公司 | Radiating assembly with high radiating efficiency, electric appliance box and air conditioner |
CN114811756A (en) * | 2022-04-14 | 2022-07-29 | 青岛海尔空调器有限总公司 | Radiator and air conditioner |
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JP2007150203A (en) * | 2005-11-30 | 2007-06-14 | Toyota Central Res & Dev Lab Inc | Heat sink |
JP2008235725A (en) | 2007-03-23 | 2008-10-02 | Calsonic Kansei Corp | Water-cooled heat sink |
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- 2010-06-21 CN CN201080028136.3A patent/CN102804369B/en not_active Expired - Fee Related
- 2010-06-21 JP JP2011519886A patent/JP5488599B2/en active Active
- 2010-06-21 DE DE112010002307T patent/DE112010002307T5/en not_active Ceased
- 2010-06-21 US US13/379,905 patent/US20120097381A1/en not_active Abandoned
- 2010-06-21 WO PCT/JP2010/060477 patent/WO2010150747A1/en active Application Filing
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US4151548A (en) * | 1976-09-04 | 1979-04-24 | Bbc Brown, Boveri & Company, Limited | Cooling container for cooling a semiconductor element |
US5159529A (en) * | 1991-05-15 | 1992-10-27 | International Business Machines Corporation | Composite liquid cooled plate for electronic equipment |
US6546999B1 (en) * | 1998-07-10 | 2003-04-15 | Visteon Global Technologies, Inc. | Flat tubes for heat exchanger |
US7025127B2 (en) * | 2002-07-05 | 2006-04-11 | Dana Canada Corporation | Baffled surface cooled heat exchanger |
US7213638B2 (en) * | 2003-04-11 | 2007-05-08 | Dana Canada Corporation | Heat exchanger with flow circuiting end caps |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150034280A1 (en) * | 2013-08-01 | 2015-02-05 | Hamilton Sundstrand Corporation | Header for electronic cooler |
EP3296649A4 (en) * | 2015-08-28 | 2018-05-30 | Mitsubishi Heavy Industries Thermal Systems, Ltd. | Air conditioning device |
AU2016316086B2 (en) * | 2015-08-28 | 2019-01-31 | Mitsubishi Heavy Industries Thermal Systems, Ltd. | Air conditioning device |
EP3550246A1 (en) * | 2018-04-03 | 2019-10-09 | Aavid Thermalloy, LLC | Wrap around heat exchanger |
EP4311384A1 (en) * | 2022-07-22 | 2024-01-24 | Aptiv Technologies Limited | Cooling system with flow guiding element |
Also Published As
Publication number | Publication date |
---|---|
JP5488599B2 (en) | 2014-05-14 |
WO2010150747A1 (en) | 2010-12-29 |
DE112010002307T5 (en) | 2012-06-21 |
CN102804369B (en) | 2015-11-25 |
JPWO2010150747A1 (en) | 2012-12-10 |
CN102804369A (en) | 2012-11-28 |
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