Heat dissipation member and manufacturing method thereof

Abstract

To provide a heat dissipation member and a manufacturing method thereof that are less likely to cause a decrease in the speed of cooling air flowing between fins.SOLUTION: A heat dissipation member 1m includes a base plate 11m and a plurality of fins 12Gm protruding from the surface of the base plate 11m, and each fin 12m of the fins 12Gm is arranged along the surface on a straight line having a first deviation angle γ with respect to the fluid flow direction D from the upstream side to the downstream side, with a distance W between each fin.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present disclosure relates to a heat dissipation member and a manufacturing method. [Background technology]

[0002] 2. Description of the Related Art It is known to use a heat sink as a cooling device for a heat generating body.

[0003] For example, Patent Document 1 discloses a heat sink that includes a base plate that is thermally connected to a heat generating element, and a plurality of plate-shaped heat dissipation fins that are erected on the main surface of the base plate at a predetermined erect angle relative to the extension direction of the main surface and are thermally connected to the base plate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-004479 Summary of the Invention [Problem to be solved by the invention]

[0005] In the heat sink disclosed in Patent Document 1, the heat dissipation fin has a fin base, which is a flat portion located on the base plate side and extending from one end to the other end in the width direction of the heat dissipation fin along the main surface of the base plate, and a vertical portion, which is a flat portion on the same plane as the fin base and extends from one end of the fin base to the fin tip in the height direction of the heat dissipation fin.Furthermore, the heat dissipation fin has an inclined portion, which is a flat portion, extending from the vertical portion to the other end at a predetermined inclination angle with respect to the fin base and the vertical portion, and extending from the fin tip to the fin intermediate portion between the fin tip and the fin base, and a twisted portion, which is a flat portion connecting the fin base, the vertical portion, and the inclined portion. However, the greater the inclination angle, the greater the pressure loss of the cooling air, which may lead to a decrease in the speed of the cooling air flowing between the heat dissipation fins.

[0006] An object of the present disclosure is to provide a heat dissipation member and a manufacturing method thereof that solves the above-mentioned problems. [Means for solving the problem]

[0007] The heat dissipation member of the present disclosure comprises a base plate and a plurality of fins protruding from the surface of the base plate, and each fin is arranged at a distance from each other along a straight line along the surface that has a first deviation angle with respect to the flow direction of the fluid from the upstream side to the downstream side.

[0008] The manufacturing method of the present disclosure includes the steps of machining grooves in a base plate, forming a plurality of fins protruding from the surface of the base plate, and cutting out portions of the plurality of fins along the surface so that each fin has a first offset angle relative to the flow direction of the fluid from upstream to downstream. [Effects of the Invention]

[0009] According to the heat dissipation member and manufacturing method according to the present disclosure, the speed of the cooling air flowing between the fins is less likely to decrease. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view I showing an example of the configuration of a heat dissipation member according to the present disclosure. [Figure 2] 2 is a perspective view II showing an example of the configuration of a heat dissipation member according to the present disclosure. FIG. [Figure 3] 1 is a plan view I showing an example of the configuration of a heat dissipation member according to the present disclosure. [Figure 4] 1 is a flowchart I showing an example of a process of a manufacturing method according to the present disclosure. [Figure 5] FIG. 1 is a diagram I showing an example of a process of the manufacturing method according to the present disclosure. [Figure 6] FIG. 2 is a diagram II showing an example of a process of the manufacturing method according to the present disclosure. [Figure 7] FIG. 3 is a diagram III showing an example of a process of the manufacturing method according to the present disclosure. [Figure 8] FIG. IV shows an example of a process in a manufacturing method according to the present disclosure. [Figure 9] FIG. 10 is a diagram illustrating an example of a heat dissipation member in a comparative example. [Figure 10] FIG. 10 is a diagram showing an example of air volume-static pressure characteristics of a fan in a comparative example. [Figure 11] 2 is a plan view II showing an example of the configuration of a heat dissipation member according to the present disclosure. FIG. [Figure 12] 10 is a flowchart II showing an example of the process of the manufacturing method according to the present disclosure. [Figure 13] 1 is a plan view I showing an example of the configuration of a heat dissipation member in an embodiment. [Figure 14] 2 is a plan view II showing an example of the configuration of a heat dissipation member in an embodiment. FIG. [Figure 15] 3 is a plan view III showing an example of the configuration of the heat dissipation member in the embodiment. FIG. [Figure 16] 4 is a plan view IV showing an example of the configuration of the heat dissipation member in the embodiment. [Figure 17] FIG. 1 is a diagram illustrating an example of a simulation environment in an embodiment. [Figure 18] FIG. 1 is a diagram I showing an example of a simulation result in an embodiment. [Figure 19] 10 is a plan view V showing an example of the configuration of the heat dissipation member in the embodiment. [Figure 20] 6 is a plan view VI showing an example of the configuration of the heat dissipation member in the embodiment. [Figure 21] FIG. 2 is a diagram II showing an example of a simulation result in the embodiment. [Figure 22] 1 is a diagram I showing an example of the temperature of the fin portion of the heat dissipation member in the embodiment. [Figure 23] 11 is a diagram II showing an example of the temperature of the fin portion of the heat dissipation member in the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, each embodiment of the present disclosure will be described with reference to the drawings. Note that the drawings and specific configurations used in each embodiment should not be used to interpret the disclosure. The same or corresponding configurations in all drawings will be assigned the same reference numerals, and common descriptions will be omitted. It should be noted that in this disclosure, the drawings may relate to one or more embodiments.

[0012] First Embodiment Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings. An example of the configuration of the heat dissipation member according to the present disclosure will be described below with reference to FIGS.

[0013] (Configuration of heat dissipation member) The heat dissipation member 1 is used as a cooling device for a heat generating element included in an electronic device. An example of the heat generating element is a central processing unit (hereinafter referred to as a "CPU"). As shown in FIGS. 1 and 2, the heat dissipation member 1 includes a base plate 11, a plurality of fins 12G, and a heat transfer member . The heat dissipation member 1 is made of a thermally conductive material, such as copper or aluminum.

[0014] (Configuration of base plate 11) The base plate 11 is located directly below each fin 12 formed by skiving a block of material. The fluid flows from the upstream side to the downstream side along the surface of the base plate 11 .

[0015] For example, the heat transfer member 13 may be joined to a part of the base plate 11. For example, the base plate 11 and the heat transfer member 13 may be integrally molded. The surface of the heat transfer member 13, which has a thickness for processing, is skived, whereby the base plate 11 and the heat transfer member 13 are integrally molded.

[0016] (Multiple fin 12G configuration) Each fin 12 is included in the plurality of fins 12G. The multiple fins 12G are formed by skiving a certain block material to form each fin 12. As described above, the base plate 11 is located directly below each fin 12. In other words, the multiple fins 12G protrude from the surface of the base plate. Heat from the heat generating element is transported to each fin 12 via the base plate 11. That is, heat from the heat generating element is transported via the base plate 11 to the plurality of fins 12G. The multiple fins 12G are arranged on a straight line, which will be described later, with a distance W between each fin. As a result, slits S are formed in the multiple fins 12G. The number of slits S corresponds to the number of virtual straight lines, which will be described later, and at least one slit is formed in the multiple fins 12G. In other words, at least one virtual straight line exists in the multiple fins 12G.

[0017] (Configuration of heat transfer member 13) The heat transfer member 13 transfers heat to the plurality of fins 12G via the base plate 11. The size of the heat transfer member 13 is smaller than the size of the base plate 11. To promote the diffusion of heat from the heat generating body, the heat transfer member 13 transfers the heat to a part of the base plate 11, and the heat is dissipated from the plurality of fins 12G. The heat transfer member 13 includes a container, a wick structure accommodated in the container, and a working fluid sealed in the container. A flow path for the vaporized working fluid is provided inside the container. The heat transfer member 13 is disposed so that one end thereof contacts the heat generating element, and the other end thereof is joined to a part of the base plate 11. The working fluid absorbs the heat transferred from the heating element through one end of the heat transfer member 13 as latent heat and vaporizes. The vaporized working fluid moves to the base plate 11 at the other end, where it is cooled by the base plate 11, which is cooler than the heating element, and liquefies, returning to the working fluid. This working fluid returns to the one end of the heat transfer member 13 due to the capillary force of the wick structure. In this way, heat is transported to the plurality of fins 12G via the base plate 11. The transported heat is cooled by the cooling air flowing between the fins 12G and is released to the outside. For example, the heat transfer member 13 is a heat pipe or a vapor chamber.

[0018] (Arrangement of each fin) 3, the fins 12 are arranged at intervals W on a straight line that has a first deviation angle γ with respect to the fluid flow direction D from the upstream side to the downstream side along the surface of the base plate 11. The interval W is equal to or greater than 3 mm and equal to or less than 13 mm. For example, when connecting the fins arranged at intervals W, straight lines (SL1, SL2, SL3, SL4, SL5, SL6) are formed. These straight lines have a first deviation angle γ with respect to the flow direction D. The first deviation angle γ is equal to or greater than 0 degrees and equal to or less than 10 degrees. By providing each fin 12 with a slight inclination (first deviation angle γ) with respect to the flow direction D, the cooling performance of the heat dissipation member 1 is improved.

[0019] The intermediate positions of the straight lines (SL1, SL2, SL3, SL4, SL5, and SL6) present within the interval W indicate the intermediate positions between the fins. In the imaginary straight lines (IL1, IL2) connecting the midpoints of each fin within the interval W, the imaginary straight line (IL1) intersects with the lines (SL1, SL2, SL3), and the imaginary straight line (IL2) intersects with the lines (SL4, SL5, SL6). This imaginary line intersects with the above-mentioned lines (SL1, SL2, SL3, SL4, SL5, SL6) at a second deviation angle δ with respect to the flow direction D. That is, the second deviation angle δ is a negative angle when the first deviation angle γ is a positive angle. The second deviation angle δ is greater than 0 degrees and less than 10 degrees. By forming the number of slits corresponding to the number of imaginary straight lines, a decrease in the flow rate of the cooling air due to pressure loss of the cooling air flowing between the fins 12 with the first deflection angle γ is suppressed.

[0020] The fins 12 are arranged in a straight line at a pitch distance P, which is equal to or greater than 0.2 mm and equal to or less than 3.0 mm. The pitch distance P is also called the fin pitch.

[0021] For example, the thickness of each fin 12 is not less than 0.05 mm and not more than 0.8 mm.

[0022] The interval W varies depending on the first deviation angle γ, the second deviation angle δ, and the number of imaginary straight lines.

[0023] (Manufacturing method) The manufacturing method in this embodiment will be described. The manufacturing method in this embodiment is carried out according to the flow shown in FIG.

[0024] First, the worker processes a groove in the base plate 11 (step ST11). For example, as shown in Fig. 5, the worker processes grooves for the slits S in the base plate 11 for forming the fins. For example, the worker may process the grooves in the base plate 11 by cutting. Alternatively, the worker may create the grooved base plate 11 by die casting. The base plate 11 is made of a heat-conductive material, preferably copper or aluminum.

[0025] Next, the worker forms a plurality of fins 12G that protrude from the surface of the base plate 11 (step ST12). For example, as shown in Fig. 6, a worker forms each fin 12 by skiving a block material. As described above, the base plate 11 is located directly below each fin 12. In other words, the multiple fins 12G protrude from the surface of the base plate.

[0026] Next, the worker cuts out some of the fins 12G along the surface of the base plate so that each fin 12 has a first deflection angle γ with respect to the fluid flow direction D from the upstream side to the downstream side (step ST13). For example, as shown in Fig. 7, the worker cuts out the fin portion along the cutting lines. The cutting lines are set so that each fin 12 has a first deviation angle γ with respect to the flow direction D.

[0027] Next, the worker joins the heat transfer member 13, which transfers heat to the fins 12G, to some of the fins 12G cut out in the cutting step (step ST13) (step ST14). For example, as shown in FIG. 8, the worker joins the heat transfer member 13 prepared in a separate process to the plurality of fins 12G cut out in step ST13 by brazing or the like. At this point, the heat dissipation member 1 is manufactured, which is less likely to cause a decrease in the speed of the cooling air flowing between the fins. (Complete)

[0028] (Action and effect) According to the heat dissipation member 1 of this embodiment, the fins 12G protruding from the surface of the base plate 11 are arranged along the surface on straight lines (e.g., SL1, SL2, SL3, SL4, SL5, SL6) that have a first deviation angle γ with respect to the fluid flow direction D from the upstream side to the downstream side, with a distance W between each fin. This forms slits S with a distance W between each fin 12. Therefore, in the heat dissipation member of the present disclosure, the cooling air flowing between the fins 12 easily flows into the slits S, reducing pressure loss of the cooling air, and the air speed is less likely to decrease even if the first deflection angle γ is increased. Therefore, the heat dissipation member according to the present disclosure is less likely to cause a decrease in the speed of the cooling air flowing between the fins.

[0029] 9-10 show a comparative example. As shown in FIG. 9, in the comparative example, the fins were provided along the flow direction D of the fluid. In a layout in which the height and width of a heat dissipation member that cools an electronic device are limited with respect to the fluid flow direction D, a heat sink in which each fin is extended along the fluid flow direction D can be considered in order to improve cooling performance. However, even if the heat dissipation member is lengthened along the fluid flow direction D, the cooling air that reaches the downstream fins will be hotter than the upstream cooling air due to the influence of heat dissipated from the upstream fins. This poses a problem in that it is difficult to expect an improvement in cooling performance.

[0030] Furthermore, if the number of fins is increased in order to improve cooling performance, the amount of cooling air may decrease due to pressure loss of the cooling air flowing between the fins. As shown in Figure 10, in the fan's air volume-static pressure characteristics, increasing the number of fins changes the pressure loss curve from 1 to 2, and the operating air volume decreases from Q1 to Q2, which can lead to issues such as a decrease in cooling performance.

[0031] In contrast to the comparative example, according to the heat dissipation member 1 of the present disclosure, each fin 12 is slightly inclined (first deviation angle γ) with respect to the flow direction D, thereby improving the cooling performance of the heat dissipation member 1. Furthermore, by forming the number of slits S corresponding to the number of imaginary straight lines, it is possible to suppress a decrease in the flow rate of the cooling air due to a pressure loss of the cooling air flowing between the fins 12 having the first deflection angle γ. Therefore, the heat dissipation member according to the present disclosure is less likely to cause a decrease in the wind speed of the cooling air flowing between the fins.

[0032] Furthermore, the heat dissipation member 1 of the present disclosure "comprises a base plate 11 and a plurality of fins 12G protruding from the surface of the base plate 11, and each fin 12 is arranged along the surface on a straight line having a first deviation angle γ with respect to the flow direction D of the fluid from the upstream side to the downstream side, with each fin being spaced apart by a distance W," thereby achieving the following effects. In the heat dissipation member 1 of the present disclosure, the multiple fins 12G protruding from the surface of the base plate 11 are arranged along the surface on straight lines (e.g., SL1, SL2, SL3, SL4, SL5, SL6) that have a first deviation angle γ with respect to the fluid flow direction D from the upstream side to the downstream side, with a distance W between each fin. This forms slits S with a distance W between each fin 12. Therefore, the following effect can be obtained: "In the heat dissipation member of the present disclosure, the cooling air flowing between each fin 12 is more likely to flow into the slits S, the pressure loss of the cooling air is reduced, and even if the first deflection angle γ is increased, the wind speed is less likely to decrease." Therefore, the heat dissipation member according to the present disclosure is less likely to cause a decrease in the speed of the cooling air flowing between the fins.

[0033] Additionally, in the heat dissipation member 1 of the present disclosure, "in the imaginary lines connecting the midpoints of each of the fins 12 existing within the interval W, the imaginary lines intersect with a straight line," and therefore "slits S of interval W are formed between each of the fins 12 along the imaginary lines. This makes it easier for the cooling air flowing between each of the fins 12 to flow through the slits S, suppresses pressure loss of the cooling air, and is less likely to result in a decrease in wind speed even if the first deflection angle γ is increased." This also has the effect of providing the following effect.

[0034] Additionally, in the heat dissipation member 1 of the present disclosure, "the imaginary line intersects with the line at a second deviation angle δ with respect to the flow direction D, and the second deviation angle δ is greater than 0 degrees and less than 10 degrees," which also provides the following effect: "slits S are formed between each fin 12 along the imaginary line, with a spacing W between them. In addition, the arrangement of the multiple slits S is angled with respect to the flow direction D, which makes it easier for the cooling air flowing between each fin 12 to flow through the slits S, thereby reducing pressure loss of the cooling air, and making the wind speed less likely to decrease even if the first deviation angle γ is increased."

[0035] In addition, in the heat dissipation member 1 of the present disclosure, the "existence of two imaginary straight lines" further provides the following effect: "The cooling air flowing between each fin 12 can easily flow into the slits S, the pressure loss of the cooling air is reduced, and even if the first deflection angle γ is increased, the wind speed is less likely to decrease."

[0036] In addition, in the heat dissipation member 1 of the present disclosure, by "the first deviation angle γ is greater than or equal to 0 degrees and less than or equal to 10 degrees," the effect that "each fin 12 is slightly inclined (first deviation angle γ) with respect to the flow direction D can improve the cooling performance of the heat dissipation member 1" can also be obtained.

[0037] In addition, in the heat dissipation member 1 of the present disclosure, "the straight lines are arranged with a pitch distance P therebetween, and the pitch distance P is 0.2 mm or more and 3.0 mm or less," which also provides the effect that "the pitch distance P between each fin 12 makes it easier for the cooling air flowing between each fin 12 to flow into the slits S."

[0038] In addition, in the heat dissipation member 1 of the present disclosure, by "the spacing W is 3 mm or more and 13 mm or less," the effect that "the cooling air flowing between each fin 12 can flow more easily through the slits S" can also be obtained.

[0039] In addition, in the heat dissipation member 1 of the present disclosure, since "the heat dissipation member is a thermally conductive material," the effect that "the heat transported to the multiple fins 12G is more easily cooled by the cooling air flowing between each fin 12 and is more easily released to the outside" can also be obtained.

[0040] In addition, in the heat dissipation member 1 of the present disclosure, the "thermal conductive material is copper or aluminum," which also has the effect that "heat transported to the multiple fins 12G is more easily cooled by the cooling air flowing between each fin 12, and is more easily released to the outside."

[0041] In addition, the heat dissipation member 1 of the present disclosure "further includes a heat transfer member 13 that transfers heat to the plurality of fins 12G via the base plate 11, and the heat transfer member 13 is a heat pipe or a vapor chamber," which provides the following effect: "The heat transfer member 13 promotes the diffusion of heat from the heat-generating body, so that the heat transferred to the plurality of fins 12G via the base plate 11 is more easily cooled by the cooling air flowing between each fin 12 and is more easily released to the outside."

[0042] <Modification> For example, a heating element may be in contact with a part of the base plate 11.

[0043] For example, the worker may perform steps ST12 and ST13 first, and perform the step of machining the grooves for the slits S last. That is, the worker may cut out the multiple fins 12G so that they are slightly inclined with respect to the flow direction D, and then form the slits S by scraping off each fin 12G at a certain width and angle from a portion of the cut-out multiple fins 12G. In this case, the manufacturing method includes the steps of forming a plurality of fins 12G protruding from the surface of the base plate 11, cutting out a portion of the plurality of fins 12G along the surface so that each fin 12 has a first deflection angle γ with respect to the fluid flow direction D from the upstream side to the downstream side, and scraping off each fin 12 at a certain width and angle from the portion of the plurality of fins 12G cut out in the cutting out step.

[0044] Second Embodiment Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings. An example of the configuration of the heat dissipation member according to the present disclosure will be described below with reference to FIG.

[0045] (composition) The heat dissipation member 1m comprises a base plate 11m and a plurality of fins 12Gm protruding from the surface of the base plate 11m, and each fin 12m is arranged along the surface on a straight line having a first deviation angle γ with respect to the fluid flow direction D from the upstream side to the downstream side, with each fin being spaced apart by a distance W.

[0046] (Action and effect) According to the heat dissipation member of the present disclosure, the fins 12Gm protruding from the surface of the base plate 11m are arranged along the surface on a straight line that has a first deviation angle γ with respect to the fluid flow direction D from the upstream side to the downstream side, with a distance W between each fin. This forms slits with a distance W between each fin 12m. Therefore, in the heat dissipation member of the present disclosure, the cooling air flowing between the fins 12m easily flows into the slits, reducing pressure loss of the cooling air, and reducing the air speed even when the first deflection angle γ is increased. Therefore, the heat dissipation member according to the present disclosure is less likely to cause a decrease in the speed of the cooling air flowing between the fins.

[0047] Third Embodiment Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings. An example of the manufacturing method according to the present disclosure will be described below with reference to FIG. The manufacturing method according to the present disclosure is carried out according to the flow shown in FIG.

[0048] The manufacturing method includes the steps of machining grooves in a base plate (step ST11m), forming a plurality of fins protruding from the surface of the base plate (step ST12m), and cutting out portions of the plurality of fins along the surface so that each fin has a first deflection angle γ with respect to the flow direction of the fluid from upstream to downstream (step ST13m).

[0049] (Action and effect) According to the manufacturing method of the present disclosure, grooves are machined in the base plate to form slits with a spacing W between each fin. Also, portions of the multiple fins are cut out so that each fin has a first deflection angle γ. The cooling performance of the heat dissipation member can be improved by providing each fin with a slight inclination (first deviation angle γ) with respect to the flow direction D. Furthermore, the formation of the slits S can suppress a decrease in the air volume of the cooling air due to pressure loss of the cooling air flowing between each fin with the first deviation angle γ. Therefore, according to the manufacturing method of the present disclosure, the speed of the cooling air flowing between the fins is less likely to decrease. [Example]

[0050] The effects of the present disclosure will be explained in more detail below using examples. The conditions in the examples are examples adopted to confirm the feasibility and effects of the present disclosure, and the present disclosure is not limited to these examples. Various conditions may be adopted in the present disclosure as long as they do not deviate from the gist of the present disclosure and the object of the present disclosure is achieved.

[0051] In the following disclosure, the first offset angle γ will also be referred to as the “fin angle” because the first offset angle γ determines the inclination angle of each fin 12 . In the following disclosure, the second deviation angle δ is also referred to as the "slit angle" because the second deviation angle δ determines the inclination angle of the imaginary straight line. In the following disclosure, the number of slits formed corresponds to the number of imaginary straight lines, and therefore the number of imaginary straight lines will also be referred to as the "number of slits."

[0052] Furthermore, the optimum values ​​for the fin angle, slit angle, slit width, and number of slits may vary depending on, for example, the allowable pressure loss of the cooling air, the size of the heat dissipation member 1, the thickness of each fin 12, the fin pitch, and the like.

[0053] 13 to 16 show heat dissipation members with different fin angles. Note that these heat dissipation members have the same size, thickness of each fin 12, and fin pitch. The heat dissipation member of Fig. 13 includes a plurality of fins 12G1, each of which is formed at a fin angle of 0 degree. In Fig. 13, similar to Fig. 9, each fin 12 is provided along the flow direction D of the fluid. The heat dissipation member of FIG. 14 includes a plurality of fins 12G2, each of which is formed at a fin angle of 10 degrees. The heat dissipation member of FIG. 15 includes a plurality of fins 12G3, each fin 12 being formed at a fin angle of 20 degrees. The heat dissipation member of FIG. 16 includes a plurality of fins 12G4, each of which is formed at a fin angle of 30 degrees.

[0054] Simulations were carried out in the wind tunnel of FIG. 17 for the four types of heat sinks shown in FIGS. The simulation conditions were set as follows: heat output of the heating element: 300 W, air temperature of the cooling air: 35°C, wind speed of the cooling air: 3 m / s, and the cooling air was set to blow uniformly onto the heat sinks. Each heat sink was equipped with a heat transfer member 13.

[0055] The simulation results are shown in Figure 18. The horizontal axis represents the fin angle, the first vertical axis represents the heating element temperature, and the second vertical axis represents the pressure loss. As shown in FIG. 13, it was confirmed that the temperature of the heat generating element decreases as the fin angle increases, compared to a heat dissipation member in which fins are provided along the flow direction D of the fluid.

[0056] Next, we investigated the improvement of cooling performance by using slits S. 19 and 20 show heat dissipating members provided with slits S. Note that these heat dissipating members also have the same size of the heat dissipating member, thickness of each fin 12, and fin pitch as the heat dissipating members of FIGS. The heat sinks in FIGS. 19 and 20 have the same conditions of a fin angle of 10 degrees, a slit width of 8 mm, and two slits, but in FIG. 19 the slit angle is 5 degrees, and in FIG. 20 the slit angle is 7.5 degrees.

[0057] The simulation results are shown in Figure 21. The horizontal axis shows the fin angle and slit angle, the first vertical axis shows the heating element temperature, and the second vertical axis shows the pressure loss. 13 and 9, the straight fins refer to a state in which each fin is provided along the fluid flow direction D. The simulation results for a heat dissipation member with a fin angle of 10 degrees, no slits, and multiple fins 12G2 are again based on the results of FIG. In Figure 21, compared to the heating element temperature and pressure loss of straight fins, the simulation results for the heat dissipation member with a fin angle of 10 degrees, no slits, and multiple fins 12G2 show that the heating element temperature improves and the pressure loss increases, as mentioned above.However, the simulation results for the heat dissipation member with slits S in Figures 19 and 20 and a fin angle exceeding 0 degrees show that the heating element temperature is lower than that of the conventional heat sink, and the pressure loss is also equivalent to that of the conventional heat sink.

[0058] 22 and 23 show graphs comparing the temperatures of the fins of the heat dissipation member in the simulation. 22 and 23, it can be seen that in the heat dissipation member provided with slits S and having a fin angle exceeding 0 degrees, cooling air passes through the slits S from the upstream side and reaches the center of the multiple fins 12G. It is believed that by allowing cooling air to reach the center of the multiple fins 12G, each fin 12 is cooled more efficiently, making it easier to reduce the temperature of the heat generating element.

[0059] From the above, the superiority of a heat dissipation member provided with slits S and having a fin angle exceeding 0 degrees as shown in FIGS. 19 and 20 has been demonstrated.

[0060] Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-described embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure. Furthermore, each embodiment can be combined with other embodiments as appropriate.

[0061] A part or all of the above-described embodiments can be described as, but not limited to, the following supplementary notes.

[0062] (Appendix 1) A base plate and a plurality of fins protruding from a surface of the base plate; Equipped with Each fin is The fins are spaced apart along a line that is offset from the upstream to downstream direction of the fluid along the surface by a first angle. Heat dissipation material.

[0063] (Appendix 2) In a virtual line connecting a plurality of intermediate positions of each fin existing within the interval, The imaginary line intersects with the straight line. 10. The heat dissipation member according to claim 1.

[0064] (Appendix 3) the imaginary line intersects with the line at a second deviation angle with respect to the flow direction; The second offset angle is greater than 0 degrees and less than 10 degrees. 3. The heat dissipation member according to claim 2.

[0065] (Appendix 4) There are two imaginary lines. 3. The heat dissipation member according to claim 2.

[0066] (Appendix 5) The first deflection angle is equal to or greater than 0 degrees and equal to or less than 10 degrees. 3. The heat dissipation member according to claim 2.

[0067] (Appendix 6) The straight lines are arranged at a pitch distance from each other, The pitch distance is 0.2 mm or more and 3.0 mm or less. 6. A heat dissipation member according to any one of claims 1 to 5.

[0068] (Appendix 7) The interval is 3 mm or more and 13 mm or less. 7. A heat dissipation member according to any one of claims 1 to 6.

[0069] (Appendix 8) The heat dissipation member is a thermally conductive material. 8. The heat dissipation member according to any one of claims 1 to 7.

[0070] (Appendix 9) The thermally conductive material is copper or aluminum. 9. The heat dissipation member according to claim 8.

[0071] (Appendix 10) a heat transfer member that transfers heat to the plurality of fins via the base plate; The heat transfer member is a heat pipe or a vapor chamber. 10. The heat dissipation member according to any one of claims 1 to 9.

[0072] (Appendix 11) machining a groove in a base plate; forming a plurality of fins protruding from a surface of the base plate; cutting a portion of the plurality of fins such that each fin has a first offset angle relative to a direction of fluid flow from upstream to downstream along the surface; Including, Manufacturing method.

[0073] (Appendix 12) a step of joining a heat transfer member, which transfers heat to the plurality of fins, to some of the plurality of fins cut out in the cutting step via the base plate; further comprising: The manufacturing method described in Appendix 11.

[0074] (Appendix 13) forming a plurality of fins protruding from a surface of a base plate; cutting a portion of the plurality of fins such that each fin has a first offset angle relative to a direction of fluid flow from upstream to downstream along the surface; a step of cutting off each fin at a certain width and angle from a portion of the plurality of fins cut out in the cutting step; Including, Manufacturing method. [Explanation of symbols]

[0075] 1 Heat dissipation material 11 Base Plate 12G Multiple Fins 12 each fin 13 Heat transfer materials 1m heat dissipation material 11m base plate 12Gm Multiple Fins 12m each fin SL1, SL2, SL3, SL4, SL5, SL6 Straight line IL1, IL2 Imaginary lines Pitch distance S slit W spacing γ First deflection angle δ Second deflection angle

Claims

1. A base plate and a plurality of fins protruding from a surface of the base plate; Equipped with Each fin is The fins are spaced apart along a line that is offset from the upstream to downstream direction of the fluid along the surface by a first angle. Heat dissipation material.

2. In a virtual line connecting a plurality of intermediate positions of each fin existing within the interval, The imaginary line intersects with the straight line. The heat dissipation member according to claim 1 .

3. the imaginary line intersects with the line at a second deviation angle with respect to the flow direction; The second offset angle is greater than 0 degrees and less than 10 degrees. The heat dissipation member according to claim 2 .

4. The first deflection angle is equal to or greater than 0 degrees and equal to or less than 10 degrees. The heat dissipation member according to claim 2 .

5. The straight lines are arranged at a pitch distance from each other, The pitch distance is 0.2 mm or more and 3.0 mm or less. The heat dissipation member according to any one of claims 1 to 4.

6. The interval is 3 mm or more and 13 mm or less. The heat dissipation member according to any one of claims 1 to 4.

7. The heat dissipation member is a thermally conductive material. The heat dissipation member according to any one of claims 1 to 4.

8. a heat transfer member that transfers heat to the plurality of fins via the base plate; The heat transfer member is a heat pipe or a vapor chamber. The heat dissipation member according to any one of claims 1 to 4.

9. machining a groove in a base plate; forming a plurality of fins protruding from a surface of the base plate; cutting a portion of the plurality of fins such that each fin has a first offset angle γ relative to a direction of fluid flow from upstream to downstream along the surface; Including, Manufacturing method.

10. a step of joining a heat transfer member that transfers heat to the plurality of fins to a part of the plurality of fins cut out in the cutting step; further comprising: The method of claim 9.

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