Heat sink and method of manufacturing a heat sink

Abstract

A flow direction (Z) of the coolant introduced into the radiator (100) is a direction orthogonal to the stacking direction (Y), each plate (80) is formed with a plurality of holes (150), and when the plates (80) are stacked in the stacking direction (Y), flow paths (800) formed by connecting the holes (150) of the plates (80) to each other in the stacking direction (Y) and the flow direction (Z) are formed spirally in the flow direction (Z), and a spiral center axis (13) of the center of the spirals of the flow paths (800) is formed in only one row in the stacking direction (Y).

Description

Technical Field

[0001] This application relates to a radiator and a method for manufacturing the radiator. Background Technology

[0002] In conventional radiators, there are liquid-cooled radiators that cool the heat-generating element by using a refrigerant to cool the main body that is in contact with the heat-generating element being cooled. In such liquid-cooled radiators, flow paths are formed inside the main body to allow the refrigerant to flow. For example, Patent Document 1 discloses a radiator composed of a laminate of a first plate and a second plate, which are flat and formed by stamping metal plates. Multiple elongated longitudinal members and inclined members that connect adjacent longitudinal members are integrally formed in both plates, so that the longitudinal members of each plate are integrated and overlapped, and the inclined members are arranged separately from each other in the aforementioned flow direction and facing opposite directions. The multiple longitudinal members are arranged parallel to each other in a direction orthogonal to the flow direction of the coolant and are positioned along the flow direction of the coolant. Existing technical documents Patent documents

[0003] Patent Document 1: Japanese Patent Application Publication No. 2010-114174 Summary of the Invention The technical problem that the invention aims to solve

[0004] Conventional radiators and their manufacturing methods involve the coolant meandering regularly along a flow path and rotating in a spiral pattern to facilitate heat transfer. In conventional structures, multiple spiraling flows are generated in the stacking direction. Heat generated by the heat-generating element (the object being cooled) located on the top layer of the stacked plates is transferred to the stacked plates and dissipated into the coolant. The temperature of the plates closest to the heat-generating element is the highest, and the temperature of the plates decreases as they move further away from the heat-generating element.

[0005] Since the greater the temperature difference between the plate and the coolant, the greater the amount of heat dissipated from the plate, more heat is dissipated to the coolant near the heat source through locally generated spiral-shaped flow. In areas far from the heat source, less heat is dissipated compared to the area near the heat source through spiral-shaped flow existing in a different column than the spiral-shaped flow described above.

[0006] Therefore, the coolant in the area close to the heat source becomes high-temperature, while the coolant in the area far from the heat source becomes low-temperature. However, inherently, in the area of ​​the heat source where the temperature difference between the plate and the coolant is greatest, there is a problem that the heat dissipation efficiency decreases when the coolant temperature becomes concentratedly high.

[0007] Furthermore, since the heat to be dissipated to the coolant is conducted within the metal before reaching the coolant, a larger cross-sectional area of ​​the thermal path within the metal makes it easier to transfer heat to areas away from the heat source, resulting in higher heat dissipation performance. On the other hand, increasing the cross-sectional area of ​​the thermal path within the metal presents the problem of difficulty in increasing the contact area between the coolant and the metal, i.e., the heat dissipation area, and a decrease in heat dissipation efficiency.

[0008] Furthermore, the contact area between adjacent plates is limited. Due to the gaps, the heat dissipation area increases. However, the cross-sectional area of ​​the heat conduction path within the metal is narrow, which makes it difficult to conduct heat to areas far from the heat source and reduces heat dissipation efficiency.

[0009] This application discloses a technology for solving the above-mentioned technical problems, the purpose of which is to provide a radiator and a method for manufacturing the radiator that can improve heat dissipation efficiency. Technical solutions adopted to solve technical problems

[0010] The heat sink disclosed in this application has a finned portion formed by stacking multiple plates along the stacking direction, wherein, The coolant introduced into the radiator flows in a direction orthogonal to the stacking direction. Each of the aforementioned plates has multiple holes formed. When the aforementioned plates are stacked along the aforementioned stacking direction, the flow path formed by the connection of the aforementioned holes in the aforementioned plates with each other in the aforementioned stacking direction and the aforementioned flow direction is formed in a spiral shape toward the aforementioned flow direction. The spiral central axis of the spiral-shaped flow path forms only one row in the aforementioned stacking direction. Furthermore, the radiator manufacturing method disclosed in this application is the radiator manufacturing method described above, wherein the radiator manufacturing method includes: In the first step, a plurality of holes are formed in each of the aforementioned plates; and In the second step, the plates are stacked along the stacking direction, and the holes of the plates are connected to each other in the stacking direction and the flow direction, thereby forming a spiral flow path in the flow direction. Invention Effects

[0011] The heat sink and its manufacturing method disclosed in this application can improve the heat dissipation efficiency of the heat sink. Attached Figure Description

[0012] Figure 1A This is a perspective view showing the structure of the heat sink according to Embodiment 1. Figure 1B It is shown Figure 1AThe diagram shows a cross-sectional view of the radiator structure. Figure 2A This is a front view showing the base, fins, and heating element removed from the radiator shown in Figure 1. Figure 2B Viewed from the side of arrow K Figure 2A An enlarged side view of the base, fins, and heating element of the radiator shown. Figure 3 This is an exploded perspective view showing the structure of the base, fins, and heating element of the radiator shown in Figure 2. Figure 4 This is a perspective view showing the base and fins of the radiator shown in Figure 2 facing upwards. Figure 5A It shows the composition Figure 4 An enlarged top view of the structure of the plate of the finned portion of the heat sink shown. Figure 5B It shows the composition Figure 4 An enlarged top view of the structure of the plate of the finned portion of the heat sink shown. Figure 5C It shows the composition Figure 4 The enlarged top view of the structure of the plate of the finned portion of the heat sink shown in Figure 5D is an illustration of the components. Figure 4 An enlarged top view of the structure of the plate of the finned portion of the heat sink shown. Figure 5E It shows the composition Figure 4 An enlarged top view of the structure of the plate of the finned portion of the heat sink shown. Figure 5F It shows the composition Figure 4 An enlarged top view of the structure of the plate of the finned portion of the heat sink shown. Figure 5G It shows the composition Figure 4 An enlarged top view of the structure of the plate of the finned portion of the heat sink shown. Figure 5H It shows the composition Figure 4 An enlarged top view of the structure of the plate of the finned portion of the heat sink shown. Figure 5I It shows the composition Figure 4 An enlarged top view of the structure of the plate of the finned portion of the heat sink shown. Figure 6 This is a front view after the base and fins of the radiator shown in Figure 2 have been removed. Figure 7A yes Figure 6 The KA-KA line sectional view of the base and fin sections shown. Figure 7B yes Figure 6 The KB-KB line sectional view of the base and fins shown is shown. Figure 7C yes Figure 6 The base and fin section shown are sectional views along line KC-KC. Figure 7D yes Figure 6is a cross-sectional view taken along line KD-KD of the base portion and the fin portion shown in Figure 7E is Figure 6 is a cross-sectional view taken along line KE-KE of the base portion and the fin portion shown in Figure 8A is a view showing Figure 7A is an enlarged view of a partial structure of the fin portion shown in Figure 8B is a view showing Figure 7B is an enlarged view of a partial structure of the fin portion shown in Figure 8C is a view showing Figure 7C is an enlarged view of a partial structure shown in Figure 8D is a view showing Figure 7D is an enlarged view of a partial structure shown in Figure 8E is a view showing Figure 7E is an enlarged view of a partial structure shown in Figure 9 is a diagram showing the flow of the coolant inside the flow path formed by connecting the holes of the plates of the radiator shown in Figure 1 to each other. Figure 10 is a contour diagram in which the streamlines of the coolant flow of the radiator shown in Figure 1 are derived by three-dimensional fluid simulation and represented by shades corresponding to the velocity. Figure 11A is a top view of the base portion of the radiator according to Embodiment 2 and the heat generating body mounted on the radiator, Figure 11B is Figure 11A is an enlarged left side view of the base portion, the fin portion of the radiator shown in and the heat generating body mounted on the radiator. Figure 12A is a top view showing the structure of the plate of the radiator according to Embodiment 3, Figure 12B is Figure 12A is an enlarged top view of the dotted line portion shown in Figure 13 is a side view of the radiator plate according to Embodiment 3. Figure 14A is a top view showing the structure of the fin member of the radiator according to Embodiment 5, Figure 14B is a top view showing the structure of the fin portion cut out from Figure 14A . DETAILED DESCRIPTION OF EMBODIMENTS

[0013] In the following description, identical or equivalent parts in the figures are labeled with the same symbols, and their descriptions are omitted as appropriate. Furthermore, the direction of plate stacking described later is denoted as the stacking direction Y, the direction orthogonal to the stacking direction Y (i.e., the direction of coolant flow) is denoted as the flow direction Z, and the direction orthogonal to both the stacking direction Y and the flow direction Z is denoted as the orthogonal direction X. Therefore, in the parts constituting the radiator, each direction is indicated and described based on these directions. Moreover, the above applies to all embodiments below; therefore, their descriptions are omitted as appropriate.

[0014] Implementation Method 1 Figure 1A This is a perspective view showing the structure of the heat sink according to Embodiment 1. Figure 1B It is shown Figure 1A The diagram shows a cross-sectional view of the radiator structure. Figure 2A This is a front view showing the structure of the base, fins, and heating element of the radiator shown in Figure 1. Figure 2B This shows the view from the side of arrow K. Figure 2A A side view of the structure of the base, fins, and heating element of the radiator shown.

[0015] Figure 3 This is an exploded perspective view of the base, fins, and heating element of the radiator shown in Figure 2. Figure 4 This is a perspective view of the finned portion of the radiator shown in Figure 2, with the upper surface facing upwards. Figures 5A to 5I It constitutes Figure 4 A top view of each plate of the finned section shown. Figure 6 This is a front view showing the structure after the base and fins of the radiator shown in Figure 1 have been removed.

[0016] Figure 7A yes Figure 6 The KA-KA line cross-sectional view of the base and fins shown. Figure 7B yes Figure 6 The KB-KB line cross-sectional view of the base and fins shown. Figure 7C yes Figure 6 The KC-KC line cross-sectional view of the base and fin section is shown. Figure 7D yes Figure 6 The KD-KD line cross-sectional view of the base and fins shown. Figure 7E yes Figure 6 The KE-KE line sectional view of the base and fin section is shown. Figure 8A It is shown Figure 7A An enlarged view of the structure of part 810 of the flow path section shown. Figure 8B It is shown Figure 7B An enlarged view of the structure of part 811 of the flow path section shown. Figure 8CIt is shown Figure 7C An enlarged view of the structure of part 812 of the flow path section shown. Figure 8D It is shown Figure 7D An enlarged view of the structure of part 813 of the flow path section shown. Figure 8E It is shown Figure 7E An enlarged view of the structure of part 814 of the flow path section shown.

[0017] Figure 9 This diagram illustrates the flow of coolant inside a flow path formed by connecting the holes in the plates of the radiator shown in Figure 1 to each other. Figure 10 The streamlines of the coolant flow in the radiator shown in Figure 1 are derived through three-dimensional fluid simulation and are represented by a density diagram corresponding to the velocity.

[0018] As shown in Figures 1 and 2, the radiator 100 of Embodiment 1 is constructed by assembling a base portion 1 onto a water-cooling jacket 7. A heating element 2 is mounted on one surface of the base portion 1, and a fin portion 8 having a flow path 800 (described later) is provided on the surface opposite to the heating element 2. The watertight connection between the base portion 1 and the water-cooling jacket 7 is achieved by positioning the base portion 1 above the water-cooling jacket 7 via an O-ring 17, pressing it against the water-cooling jacket 7 with a fastening plate 3, and securing it with bolts 4.

[0019] The water-cooled jacket 7 is connected to a coolant supply pipe 5 and a coolant discharge pipe 6. Coolant flows in from the supply pipe 5 and passes through the flow path inlet 9. Figure 2B The contents flow into and through the flow path 800 of the finned section 8, and are discharged from the discharge pipe 6.

[0020] like Figure 3 , Figure 4 As shown in Figure 5, the flow path 800 of the fin portion 8 is formed by stacking plates 81, 82, 83, 84, 85, 86, 87, 88, and 89 (hereinafter, when referring to all these holes, they are referred to as holes 151 to 159, and when referring to any one hole, they are referred to as hole 150) that have holes 151, 152, 153, 154, 155, 156, 157, 158, and 159 (hereinafter, when referring to all these plates, they are referred to as plates 81 to 89, and when referring to any one plate, they are referred to as plate 80) with different patterns, and connecting the specified holes 150 to each other along the stacking direction Y and the flow direction Z.

[0021] use Figure 6 Figure 7, Figure 8 Figure 9 The flow path 800 is described below. The flow path 800 is formed by connecting the specified holes 150 to each other facing the stacking direction Y and the flow direction Z (see parts 810, 811, 812, 813, 814, 815). Furthermore, as... Figure 9 As shown, multiple spiral flow paths 800 extending toward the flow direction Z of the coolant are formed in the fin portion 8.

[0022] Furthermore, as shown in Figure 7, the spiral central axis 13 of the spiral flow path 800 forms only one row in the stacking direction Y of the plates 81-89 of the fin portion 8, and multiple rows are formed in the orthogonal direction X, which is orthogonal to the stacking direction Y of the plates 81-89 and the flow direction Z of the coolant. Additionally, in the figures of this embodiment 1 and the following embodiments (… Figure 9 Except for the spiral central axis 13, its location is indicated by a black circle.

[0023] Furthermore, adjacent spiral flow paths 800 in the orthogonal direction X are intertwined to form this structure. Specifically, as shown in Figure 8... Figure 9 As shown, spirals R1 (solid arrow) and R2 (dashed arrow) in the spiral flow path 800 intertwine and connect midway. Furthermore, Figure 9 The spirals R1 and R2 shown are an example; other parts are formed in the same relationship.

[0024] To verify how the coolant flows in this flow path 800, the results of numerical calculations performed through three-dimensional fluid simulation are shown below. Figure 10 .like Figure 10 As shown, the coolant flow lines 16 are formed in multiple rows in a spiral shape along the orthogonal direction X of plates 81-89. Figures 8A to 8E As shown, the heat emitted from the heating element 2 is conducted to the base portion 1 and the plates 81 to 89 constituting the fin portion 8, and is dissipated from the wall of the flow path 800 to the coolant.

[0025] In the radiator 100, no temperature unevenness occurs in the coolant, and the region from the vicinity of the heat-generating element 2 to the region away from the heat-generating element 2 in the stacking direction Y can be kept at a constant temperature, thereby improving the heat dissipation performance of the radiator 100. Therefore, it is important to prevent temperature unevenness in the coolant. According to the radiator 100 of this embodiment 1, since the spiral central axis 13 of the spiral flow path 800 formed by connecting the predetermined holes 150 of plates 81 to 89 to each other in the stacking direction Y and the flow direction Z forms only one row in the stacking direction Y, the flow of coolant in the fin portion 8 from the vicinity of the heat-generating element 2 to the region away from the heat-generating element 2 can be reliably diffused in one continuous manner.

[0026] Therefore, by uniformly stirring the coolant in the region from near the heat source 2 to away from the heat source 2, temperature unevenness of the coolant can be eliminated, and heat dissipation performance can be improved. With this configuration, it is easy to ensure the cross-sectional area of ​​the heat conduction path and the heat dissipation area within the finned portion 8.

[0027] Furthermore, since the spiral central axis 13 forms multiple rows in the orthogonal direction X of the fin portion 8, and adjacent spiral flow paths 800 are intertwined in the plane, by slightly offsetting the positions of the holes 150 of adjacent plates in the stacking direction Y, a flow path 800 is formed. Figure 8C The stepped portion 19 shown increases the heat dissipation area. Furthermore, since adjacent plates 81 to 89 are connected without gaps in the stacking direction Y, the cross-sectional area of ​​the heat conduction path can also be increased, thereby improving heat dissipation performance.

[0028] Furthermore, the base portion 1 on which the heating element 2 is mounted is parallel to the flow direction Z of the coolant, and is generally parallel to the thickness T of each of the plates 81 to 89 (refer to...). Figure 13 Compared to the previous method, the length W of the mounting surface on the side where the heating element 2 is mounted is sufficiently long (see Figure 2). Therefore, if the stacking direction of the plates is set to the direction of the length W, the number of plates required will increase. However, in this application, since the stacking direction Y of the plates 80 is set to be orthogonal to the flow direction Z and the orthogonal direction X of the coolant, the number of plates 80 required can be reduced, and the contact surface or joint surface between the plates 81 to 89 can be reduced, thereby improving manufacturability and reducing thermal resistance, i.e., improving heat dissipation performance.

[0029] Plate 80 uses a material with good thermal conductivity, such as aluminum or copper. Furthermore, during the lamination of plates 80, by applying pressure, adjacent plates 80 in the lamination direction Y are pressed tightly against each other, reducing the thermal resistance between the contact surfaces and improving heat dissipation performance. Alternatively, plates 80 can be made to adhere tightly without separation by riveting or the like. Or, by forming a metal joint between plates 80 through brazing, diffusion bonding, or friction stir bonding, the contact thermal resistance can be reduced to zero, further improving heat dissipation performance.

[0030] The shape of the hole 150 and the number of plates 80 shown in Figure 5 are examples. As long as the flow path 800 formed by connecting the holes 150 of the plates 80 to each other in the stacking direction Y and the flow direction Z is spiral, the spiral central shaft 13 forms only one row in the stacking direction Y of the plates 80, and the spiral central shaft 13 forms multiple rows in the orthogonal direction X of the fin portion 8, and the adjacent spiral flow paths 800 in the orthogonal direction X are formed in a way that they are partially connected by intertwining with each other, the shape of the hole 150 and the number of plates 80 are not limited.

[0031] In addition, the fastening of the base part 1 and the water-cooling jacket 7 and the assurance of water tightness do not necessarily require the use of the fastening plate 3. The base part 1 and the water-cooling jacket 7 can be fastened directly by the bolts 4. Alternatively, the O-ring 17 can be omitted and a liquid gasket can be used. The base part 1 and the water-cooling jacket 7 can also be directly joined by brazing or friction stirring.

[0032] Alternatively, instead of using the base portion 1 and the water-cooling jacket 7, the plates without holes can be brazed to the upper and lower surfaces of the stacking direction Y of plates 81-89 to ensure water tightness and form the flow path 800. (Figures 7 and 8) Figure 9 The flow path 800 shown has a portion where adjacent flow paths 800 intertwine in the middle, but they do not necessarily need to intertwine and can always remain separate.

[0033] Next, the manufacturing method of the heat sink of Embodiment 1 as described above will be explained. Each plate 81-89 is formed by opening a plurality of different holes 151-159 in each plate (first step). Next, the plates 81-89 are stacked along the stacking direction Y to form a spiral flow path 800 in which the predetermined holes 150 of each plate 81-89 are connected to each other in the stacking direction Y and the flow direction Z (second step).

[0034] Then, after the second process, pressure is applied from the stacking direction Y to press adjacent plates 81-89 together tightly in the stacking direction Y as a third process. Alternatively, the contact points of adjacent plates 81-89 in the stacking direction Y are brazed as joints. Alternatively, the contact points of adjacent plates 81-89 in the stacking direction Y are diffusion bonded as joints. Alternatively, the contact points of adjacent plates 81-89 in the stacking direction Y are friction stir bonded as joints. Then, fin portion 8 is formed. Next, the radiator 100 is formed using fin portion 8.

[0035] According to the heat sink of Embodiment 1 constructed as described above, In a heat sink with fins formed by stacking multiple plates along the stacking direction, The coolant introduced into the radiator flows in a direction orthogonal to the stacking direction. Each of the aforementioned plates has multiple holes formed. When the aforementioned plates are stacked along the aforementioned stacking direction, the flow path formed by the connection of the aforementioned holes in the aforementioned plates with each other in the aforementioned stacking direction and the aforementioned flow direction is formed in a spiral shape toward the aforementioned flow direction. The spiral central axis of the aforementioned flow path forms only one row in the aforementioned stacking direction. Furthermore, the manufacturing method of the heat sink according to Embodiment 1 as described above, Because the manufacturing method of the above-mentioned radiator includes: In the first step, a plurality of holes are formed in each of the aforementioned plates; and In the second step, the plates are stacked along the stacking direction, and the holes of the plates are connected to each other in both the stacking and flow directions to form a spiral flow path in the flow direction. Therefore, in the spiral coolant flow path formed by connecting the holes of the plates together, the spiral central axis forms only one row in the stacking direction, and the coolant flow reliably diffuses in the stacking direction from the vicinity of the heat source to the region away from the heat source in a continuous manner. Thus, by uniformly stirring the coolant in the region from the vicinity of the heat source to the region away from the heat source, temperature unevenness can be eliminated and heat dissipation performance can be improved.

[0036] Furthermore, according to the heat sink of Embodiment 1, since the fin portion has various plates with different patterns of the holes described above, Therefore, it is possible to easily construct a spiral flow path.

[0037] Furthermore, according to the heat sink of Embodiment 1, Because the aforementioned flow paths form multiple rows in orthogonal directions that are orthogonal to the aforementioned stacking direction and the aforementioned flow direction, Therefore, the central axis of the spiral forms multiple rows in orthogonal directions, which simply increases the heat dissipation area.

[0038] Furthermore, according to the heat sink of Embodiment 1, Since the above flow path is formed by partially connecting adjacent flow paths in the orthogonal directions, Therefore, the intertwined portions of adjacent flow paths in the orthogonal direction are connected together, thereby further increasing the heat dissipation area.

[0039] Furthermore, according to the heat sink of Embodiment 1, Because the adjacent plates in the aforementioned stacking direction are pressed together by pressure from the aforementioned stacking direction, Furthermore, according to the heat sink manufacturing method of Embodiment 1, since after the second step described above, a third step is included where pressure is applied from the lamination direction and the adjacent plates in the lamination direction are pressed together tightly, Therefore, the adjacent plates are connected without gaps in the stacking direction, which increases the cross-sectional area of ​​the heat conduction path and improves heat dissipation performance.

[0040] Furthermore, according to the heat sink of Embodiment 1, Since joints are formed at the points where adjacent plates in the aforementioned stacking direction come into contact with each other, Therefore, the boards can be reliably connected to each other along the stacking direction.

[0041] Furthermore, according to the heat sink of Embodiment 1, Since the above-mentioned joint is formed by brazing. Furthermore, according to the manufacturing method of the radiator in Embodiment 1, Since after the second process described above, there is a third process that involves brazing the portions of the plates that are in contact with each other in the stacking direction, Therefore, it is possible to achieve zero contact thermal resistance, thereby further improving heat dissipation performance.

[0042] Furthermore, according to the heat sink of Embodiment 1, Since the above-mentioned joint is formed by diffusion bonding, Furthermore, according to the manufacturing method of the radiator in Embodiment 1, Since the second process described above is followed by a third process that involves diffusion bonding of the portions of the plates that are in contact with each other in the stacking direction, Therefore, it is possible to achieve zero contact thermal resistance, thereby further improving heat dissipation performance.

[0043] Furthermore, according to the heat sink of Embodiment 1, The aforementioned joint is formed by frictional stirring. Furthermore, according to the manufacturing method of the radiator in Embodiment 1, Since after the second step described above, there is a third step involving friction stirring to join the portions of the plates that are in contact with each other in the stacking direction, Therefore, it is possible to achieve zero contact thermal resistance, thereby further improving heat dissipation performance.

[0044] Furthermore, in the following embodiments, the description will focus on the parts that differ from Embodiment 1 described above. Therefore, the description of the parts that are the same as those in Embodiment 1 described above will be appropriately omitted.

[0045] Implementation Method 2 Figure 11A This is a top view showing the base portion of the radiator and the structure of the heat-generating element mounted on the radiator according to Embodiment 2. Figure 11B yes Figure 11A An enlarged left view of the base, fins, and heating element mounted on the radiator shown.

[0046] The difference between the radiator of Embodiment 1 and the radiator of Embodiment 2 is that multiple heat-generating elements 2, which should be cooled by the radiator, are installed. Furthermore, in each region of the finned portion 8 from which heat is input, at least one or more helical central shafts 13 of the flow path 800 of the finned portion 8 are present. Figure 11BThe image shows an example where each heating element 2 has seven spiral central shafts 13. Thus, the entire radiator 100 has fourteen spiral central shafts 13, meaning that spiral flow paths 800 are formed at fourteen locations.

[0047] In areas where there is no heat source 2 to be cooled, there is no need to specifically provide flow paths 800. By centrally providing the spiral central shaft 13 of the flow paths 800 in the areas where heat is input from the heat source 2, compared to providing flow paths 800 in areas where heat is not input from the heat source 2, the flow rate of coolant flowing into each flow path 800 can be increased, resulting in an increased coolant velocity. Since a faster coolant velocity results in a higher heat transfer rate, heat dissipation performance can be improved.

[0048] According to the heat sink of Embodiment 2 constructed as described above, It achieves the same effect as embodiment 1 described above. Furthermore, since multiple heating elements can be installed in the aforementioned radiator, and the aforementioned flow path is formed only in each region where heat is input from each of the aforementioned heating elements, Therefore, the flow rate of coolant flowing into each flow path can be increased, resulting in an increase in coolant velocity. Since a faster coolant velocity leads to a greater heat transfer rate, heat dissipation performance can be improved.

[0049] Implementation Method 3 Figure 12A This is a top view showing the structure of the heat sink plate according to Embodiment 3. Figure 12B It is shown Figure 12A An enlarged top view of the structure of the dashed section J of the plate shown. Figure 13 This is a side view of the heat sink plate according to embodiment 3.

[0050] According to the heat sink 100 of this embodiment 3, the shortest distance L between adjacent holes 150 formed on the plate 80 is shaped as the thickness T of the plate 80. Figure 13 For example, when the holes 150 of the plate 80 are formed by punching, if the shortest distance L between adjacent holes 150 is formed to be greater than or equal to the thickness T of the plate 80, it is possible to suppress breakage or collapse at the portion where the shortest distance L between adjacent holes 150 is.

[0051] The heat sink is constructed as described in Embodiment 3 above. It achieves the same effect as the above-described implementation method. At the same time, since the shortest distance between adjacent holes in the aforementioned plate is greater than or equal to the thickness of the aforementioned plate, Therefore, it can prevent breakage or collapse at the plate.

[0052] Implementation Method 4 In the heat sink of embodiment 4, the total number of stacked plates 80 is set to N (N is an integer of 7 or more when it is odd, and an integer of 6 or more when it is even). When N is odd, the number of patterns of holes 150 in the plates 80 is (((N-1) / 2)+1). When N is even, the number of patterns of holes 150 in the plates 80 is N / 2.

[0053] As shown in Figures 7 and 8 Figure 9 As shown, the spiral flow path 800 has a shape that is symmetrical with respect to the spiral central axis 13 and the stacking direction Y of the plate 80. Therefore, the thickness T of the plate 80 can be appropriately selected, and the shape of the holes 150 of the plates 80 in each stacking direction Y can be formed into a spiral shape when stacked symmetrically with respect to the spiral central axis 13. Thus, when the number of N plates is odd, only ((N-1) / 2)+1 types of hole 150 patterns for the plates 80 need to be prepared. When the number of N plates is even, only N / 2 types of hole 150 patterns for the plates 80 need to be prepared.

[0054] Therefore, compared to the case where the pattern of holes 150 in all N blocks of plates 80 is different, the variety of hole patterns in plates 80 can be reduced, thus increasing productivity.

[0055] The heat sink is constructed as described in Embodiment 4 above. It achieves the same effect as the above-described implementation method. Meanwhile, when the total number of the above boards is N (N is an integer greater than or equal to 7 when it is odd, and an integer greater than or equal to 6 when it is even), When N is an odd number, the number of possible patterns is (((N-1) / 2)+1. When N is an even number, the number of patterns is N / 2, thus reducing the number of patterns for holes in the plate and improving manufacturability.

[0056] Implementation Method 5 Figure 14A This is a top view showing the structure of the fin member 888 of the fin section 8 used in manufacturing the radiator of embodiment 5. Figure 14B It shows from Figure 14A The top view of the structure of the fin portion 8 cut from the fin member 888 shown. In the case of embodiment 5, for example, a plate member (first process) is formed with a plane area that is more than twice the area of ​​the fin portion 8, which is a plate 81 to 89 with a pattern of holes 151 to 159 as shown in FIG. 5.

[0057] Next, the plate components are stacked along the Y-direction (second step), and a bonding or joining process is performed to manufacture fin component 888. Figure 14A (Third process). Next, corresponding to the desired size of flow path 800, with the required size ( Figure 14B The dotted line portion) is cut from the fin component 888 to manufacture the fin section 8 ( Figure 14B (Fourth process).

[0058] In the manufacturing of the fin section 8 having the flow path 800, the processes of pressing the plates 80 together in the stacking direction Y, brazing, diffusion bonding, or friction stirring bonding are the most time-consuming and costly. Therefore, in this embodiment 5, as described above, a fin member 888 larger than the size of the fin section 8 having the required flow path 800 is manufactured in advance.

[0059] Then, multiple fin sections 8 of a predetermined size are cut out. If manufactured in this way, the number of processes that take the most time, such as pressurization, brazing, diffusion bonding, or friction stirring bonding, can be completed in one go when multiple fin sections 8 with the required flow path 800 are formed, thus significantly reducing the number of processes.

[0060] The heat sink is constructed as described in Embodiment 5 above. It achieves the same effect as the above-described implementation method. Since the finned component is formed by performing the first to third processes using a plate component with an area more than twice the area of ​​the aforementioned finned portion, This includes a fourth step of cutting multiple fin portions from the aforementioned fin components. Therefore, when manufacturing multiple radiators, the number of processes can be significantly reduced.

[0061] This application describes various exemplary implementation methods and embodiments, but the various features, methods and functions described in one or more implementation methods are not limited to specific implementation methods, and can be applied to implementation methods alone or in various combinations. Therefore, numerous variations not illustrated are contemplated within the scope of the technology disclosed in this application. These include variations of at least one constituent element, addition of at least one constituent element, or omission of at least one constituent element. Additionally, they include extracting at least one constituent element and combining it with constituent elements of other embodiments. Symbol Explanation

[0062] 1. Base section, 100 radiator, 13 spiral central shaft, 150 holes, 151 holes, 152 holes, 153 holes, 154 holes, 155 holes, 156 holes, 157 holes, 158 holes, 159 holes, 16 streamlines, 17 O-rings, 19 stepped section, 2 heating element, 3 fastening plate, 4 bolts, 5 supply pipes, 6 discharge pipes, 7 water cooling jacket, 8 fin section, 80 plate, 800 flow path, 81 plate, 82 plate, 83 plate, 84 plate, 85 plate, 86 plate, 87 plate, 88 plate, 89 plate, 810 part, 811 part, 812 part, 813 part, 814 part, 888 fin component, 9 flow path inlet, L shortest distance, T thickness, Y stacking direction, X orthogonal direction, Z flow direction.

Claims

1. A radiator having a finned portion formed by stacking multiple plates along a stacking direction, characterized in that, The coolant introduced into the radiator flows in a direction orthogonal to the stacking direction. Each of the plates is formed with multiple holes. When the plates are stacked along the stacking direction, the flow paths formed by the connections between the holes in the plates in the stacking direction and the flow direction are spirally formed toward the flow direction. For the spiral center axis of the spiral center of the flow path, the number of the spiral center axes arranged along the stacking direction is one.

2. The radiator as described in claim 1, characterized in that, The fin portion has various plates with different hole patterns.

3. The radiator as described in claim 2, characterized in that, When the total number of boards is set to N, N is an integer greater than or equal to 7 when N is odd, and an integer greater than or equal to 6 when N is even. When N is an odd number, the number of pattern types is ((N-1) / 2) + 1. When N is an even number, the number of patterns is N / 2.

4. The radiator as described in claim 1, characterized in that, The flow path is formed in multiple rows in an orthogonal direction to the stacking direction and the flow direction.

5. The radiator as described in claim 2, characterized in that, The flow path is formed in multiple rows in an orthogonal direction to the stacking direction and the flow direction.

6. The radiator as described in claim 3, characterized in that, The flow path is formed in multiple rows in an orthogonal direction to the stacking direction and the flow direction.

7. The radiator as described in any one of claims 4 to 6, characterized in that, The flow path is formed by partially connecting adjacent flow paths in the orthogonal direction.

8. The radiator as described in any one of claims 1 to 6, characterized in that, Multiple heating elements can be installed in the radiator, and the flow path is formed only in each region where heat is input from each of the heating elements.

9. The radiator as described in claim 7, characterized in that, Multiple heating elements can be installed in the radiator, and the flow path is formed only in each region where heat is input from each of the heating elements.

10. The radiator according to any one of claims 1 to 6 and claim 9, characterized in that, The adjacent plates in the stacking direction are formed by pressing them together with each other from the stacking direction.

11. The radiator as claimed in claim 7, characterized in that, The adjacent plates in the stacking direction are formed by pressing them together with each other from the stacking direction.

12. The radiator as claimed in claim 8, characterized in that, The adjacent plates in the stacking direction are formed by pressing them together with each other from the stacking direction.

13. The radiator according to any one of claims 1 to 6 and claim 9, characterized in that, A joint is formed at the location where adjacent plates in the stacking direction come into contact with each other.

14. The radiator as claimed in claim 7, characterized in that, A joint is formed at the location where adjacent plates in the stacking direction come into contact with each other.

15. The radiator as claimed in claim 8, characterized in that, A joint is formed at the location where adjacent plates in the stacking direction come into contact with each other.

16. The radiator as claimed in claim 13, characterized in that, The joint is formed by brazing.

17. The radiator as described in claim 14 or 15, characterized in that, The joint is formed by brazing.

18. The radiator as claimed in claim 13, characterized in that, The joint is formed by diffusion bonding.

19. The radiator as claimed in claim 14 or 15, characterized in that, The joint is formed by diffusion bonding.

20. The radiator as claimed in claim 13, characterized in that, The joint is formed by friction stirring.

21. The radiator as described in claim 14 or 15, characterized in that, The joint is formed by friction stirring.

22. The radiator according to any one of claims 1 to 6, 9, 11 to 12, 14 to 16, 18, and 20, characterized in that, The shortest distance between adjacent holes in the plate is formed to be greater than or equal to the thickness of the plate.

23. The radiator as claimed in claim 7, characterized in that, The shortest distance between adjacent holes in the plate is formed to be greater than or equal to the thickness of the plate.

24. The radiator as claimed in claim 8, characterized in that, The shortest distance between adjacent holes in the plate is formed to be greater than or equal to the thickness of the plate.

25. The radiator as claimed in claim 10, characterized in that, The shortest distance between adjacent holes in the plate is formed to be greater than or equal to the thickness of the plate.

26. The radiator as claimed in claim 13, characterized in that, The shortest distance between adjacent holes in the plate is formed to be greater than or equal to the thickness of the plate.

27. The radiator as claimed in claim 17, characterized in that, The shortest distance between adjacent holes in the plate is formed to be greater than or equal to the thickness of the plate.

28. The radiator as claimed in claim 19, characterized in that, The shortest distance between adjacent holes in the plate is formed to be greater than or equal to the thickness of the plate.

29. The radiator as claimed in claim 21, characterized in that, The shortest distance between adjacent holes in the plate is formed to be greater than or equal to the thickness of the plate.

30. A method for manufacturing a radiator as described in any one of claims 1 to 29, characterized in that, The method for manufacturing the radiator includes: In the first step, a plurality of holes are formed in each of the aforementioned plates; and In the second step, the plates are stacked along the stacking direction, and the holes of the plates are connected to each other in the stacking direction and the flow direction, thereby forming a spiral flow path in the flow direction.

31. The method for manufacturing a radiator as described in claim 30, characterized in that, Following the second step, a third step is included, in which pressure is applied from the lamination direction and the adjacent plates in the lamination direction are pressed together tightly.

32. The method for manufacturing a radiator as described in claim 30, characterized in that, Following the second step, a third step is performed to braze the portions of the plates that are in contact with each other in the stacking direction.

33. The method for manufacturing a radiator as described in claim 30, characterized in that, Following the second step, a third step is performed to diffusely bond the portions of the plates that are in contact with each other in the stacking direction.

34. The method for manufacturing a radiator as described in claim 30, characterized in that, Following the second step, a third step is included, in which the portions of the plates that are in contact with each other in the stacking direction are frictionally stirred and bonded.

35. The method of manufacturing a radiator according to any one of claims 31 to 34, characterized in that, After forming the finned component by performing the first to third processes using a plate component with an area more than twice the area of ​​the finned portion. The fourth step includes cutting out a plurality of the fin portions from the fin member.

Images