WO2006115073A1 - Liquid-cooled jacket - Google Patents

Abstract

A liquid-cooled jacket (J1) capable of efficiently cooling a heat generating body such as a CPU. The CPU (101) is installed at a prescribed position, and a heat generated by the CPU (101) is transmitted to a cooling water supplied from a heat carrying fluid supply means on the outside and circulating in the liquid-cooled jacket. The liquid-cooled jacket (J1) comprises a first flow passage (A1) on the heat carrying fluid supply means side, a second flow passage group (B1) formed of a plurality of second flow passages (B1a) branched from the first flow passage (A1), and a third flow passage (C1) formed by converging the plurality of second flow passages (B1a) on the downstream side of the plurality of second flow passages (B1a). The CPU (101) uses the liquid-cooled jacket (J1) exchanging heat mainly in the second flow passage group (B1).

Description

 Specification

 Liquid cooling jacket

 Technical field

 The present invention relates to a liquid cooling jacket that cools a heat generating body such as a CPU.

 Background art

 [0002] In recent years, as the performance of electronic devices typified by personal computers has improved, the amount of heat generated by the mounted CPU (heat generator) has increased, and CPU cooling has become increasingly important. Yes. Conventionally, air-cooled fan-type heat sinks have been used to cool CPUs. However, problems such as fan noise and cooling limits in air-cooled systems have been raised. Cold jackets (also called water-cooled jackets and liquid-cooled modules) are attracting attention.

 [0003] With regard to such a technique, for example, a liquid cooling jacket having a metal tube formed in a meandering shape and provided with an intake port and an exhaust port at both ends thereof has been proposed (Japanese Patent Laid-Open No. Sho 63-63). No. 293865, page 2, upper right column, line 2 to lower left column, line 15 (see Fig. 1, Fig. 2). Disclosure of the invention

 Problems to be solved by the invention

[0004] However, if the flow path through which the cooling water flows is one like the liquid cooling jacket described in the above-mentioned patent document, the pressure loss received by the cooling water increases. As a result, there is a problem that the output of the pump that supplies cooling water that cannot be efficiently cooled by the CPU must be increased.

[0005] Accordingly, an object of the present invention is to provide a liquid cooling jacket that can efficiently cool a heat generating body such as a CPU that solves the above problems.

 Means for solving the problem

[0006] As means for solving the above-mentioned problems, the present invention provides a heat generating body attached to a predetermined position, and heat generated by the heat generating body is supplied from an external heat transport fluid supply means. A liquid cooling jacket for transmitting to a heat transport fluid that circulates inside, a second flow path comprising a first flow path on the heat transport fluid supply means side and a plurality of second flow paths branched from the first flow path. A flow path group and a third flow path that collects the plurality of second flow paths on the downstream side of the plurality of second flow paths, and the heat generator is the main part of the second flow path group. It is a liquid cooling jacket characterized by heat exchange.

 [0007] According to such a liquid cooling jacket, the heat transport fluid from the external heat transport fluid supply means is supplied to the first flow path. Next, the second flow path group and the third flow path are distributed in this order. The heat generated by the heat generating body is transferred to the heat transporting fluid mainly through heat exchange in the second flow path group. As a result, the heat generator is suitably cooled.

 [0008] Here, the second flow path group is composed of a plurality of second flow paths branched from the first flow path, and the plurality of second flow paths are assembled in the third flow path. Compared with the case where the flow path is formed in one meandering shape, the length of each second flow path is dramatically shortened. As a result, the pressure loss of the heat transport fluid that flows through the plurality of second flow paths is significantly smaller than the pressure loss of the heat transport fluid that flows through the second flow path having the one long flow path length. Become. Also, in the present invention, the adjacent second flow paths are completely isolated like the second flow paths B5a and B5a related to the liquid cooling jacket J6 according to the sixth embodiment described later (see FIG. 26). You don't have to!

 Therefore, according to such a liquid cooling jacket, an external heat transport fluid supply means (for example, a pump) with a small output is used to supply the heat transport fluid and distribute the heat transport fluid in the liquid cooling jacket. It is possible to efficiently cool the heat generating body such as.

 [0009] Further, according to the present invention, the heat generating body is attached at a predetermined position, and the heat generated by the heat generating body is supplied from an external heat transport fluid supply means and is transmitted to the heat transport fluid flowing through the inside. A liquid cooling jacket having a first flow path, a plurality of second flow path groups including a plurality of second flow paths, and a third flow path toward the downstream side; The generator is a liquid cooling jacket mainly exchanging heat in the second flow path group, and the adjacent second flow path groups are connected in series via a connection flow path. To do.

 That is, the second channel group has a plurality of second channel groups, and the plurality of second channel groups are liquid cooling jackets arranged in series.

[0010] According to such a liquid cooling jacket, a plurality of second flow paths are provided by including a plurality of second flow path groups (second flow path group portions) connected in series via a connection flow path. Heat exchange is possible between the group and the heat generator. [0011] Further, the adjacent second flow path groups are arranged in parallel, and one downstream end and the other upstream end are on the same side.

 That is, the adjacent second flow path group portions are juxtaposed, and one downstream end and the other upstream end are liquid cooling jackets on the same side.

 [0012] According to such a liquid cooling jacket, the heat exchange fluid passes through one of the second flow path groups adjacent in the flow direction of the heat exchange fluid, the other of the connection flow paths, and the other of the adjacent second flow path groups. It circulates to meander through. Therefore, when the size of the liquid cooling jacket in a plan view is constant, if the number of second flow path groups is increased without changing the number of second flow paths that constitute each second flow path group, The channel cross-sectional area of each second channel constituting each second channel group is reduced. Therefore, when the flow rate of the heat transport fluid flowing through the liquid cooling jacket is constant, the flow velocity of the heat transport fluid in each second flow channel increases as the number of second flow channel groups increases. Therefore, the heat transfer rate from the liquid cooling jacket to the heat transport fluid increases, and as a result, the thermal resistance of the liquid cooling jacket decreases.

 On the other hand, if the adjacent second flow path groups are not arranged side by side, for example, arranged in a single line in the flow path direction, the number of second flow path groups increases. However, only the channel length of each second channel constituting each second channel group is shortened, its cross-sectional area is not reduced, and the flow rate of the heat exchange fluid is not increased. Therefore, the thermal resistance of the liquid cooling jacket does not decrease. Further, if the number of second flow path groups is an even number, the inlet and outlet of the heat transport fluid to the liquid cooling jacket can be arranged on the same side, and as a result, the piping connected to the liquid cooling jacket can be routed. Becomes easy.

 [0013] In addition, a tube bundle in which a plurality of metal tubes are bundled is provided, and a hollow portion of each tube is the second flow path.

 [0014] Such a liquid cooling jacket includes a tube bundle formed by bundling metal tubes, so that the hollow portion of each tube becomes the second flow path, and the liquid cooling jacket can be easily configured. In addition, by appropriately changing the number and thickness of the metal pipes to be bundled, the number and thickness of the second flow paths (flow channel cut area) can be easily changed.

[0015] In addition, a metal tube having a plurality of hollow portions is provided, and each of the hollow portions is the second flow path. [0016] According to such a liquid cooling jacket, the liquid cooling jacket can be easily configured using a metal tube having a plurality of hollow portions.

[0017] Further, it is characterized in that a plurality of metal fins arranged at a predetermined interval are provided, and the second flow path is between adjacent fins.

[0018] According to such a liquid cooling jacket, since the second flow path is provided between the adjacent fins, the heat from the heat generator is circulated through the second flow path via the plurality of fins. It can be transmitted to the transport fluid.

 [0019] The width W of the second flow path is 0.2 to 1. Omm.

 [0020] According to such a liquid cooling jacket, the thermal resistance and the pressure loss experienced by the heat transport fluid passing through the inside can be in a favorable range.

[0021] Further, the width W of the second flow path and the thickness T of the fin between the adjacent second flow paths satisfy the following expression (1).

 -0. 375 XW + 0. 875≤T / W≤- 1. 875 XW + 3.275 (1)

[0022] According to such a liquid cooling jacket, the thermal resistance is reduced, and good heat exchange can be performed between the heat generating body and the heat transporting fluid.

[0023] Further, the depth D and the width W of the second flow path satisfy the following expression (2).

 5 XW + 1≤D≤16. 25 XW + 2. 75 (2)

[0024] According to such a liquid cooling jacket, the thermal resistance is reduced, and good heat exchange can be performed between the heat generating body and the heat transporting fluid.

[0025] Further, a fin member configured to include the plurality of metal fins and a base plate on which the plurality of metal fins are erected, a jacket body that accommodates the fin members, And the base plate is fixed to the jacket body so as to allow heat exchange.

 [0026] Such a liquid cooling jacket, for example, cuts a metal extrusion mold material having a bottom plate serving as a base plate and a plurality of strips serving as a plurality of fins provided upright on the bottom plate. After producing a fin member provided with metal fins, a liquid cooling jacket can be formed by fixing the fin member to, for example, a box-shaped jacket body.

Also, for example, by forming a plurality of grooves in a metal block, a plurality of metal It is also possible to produce a fin member including the fins.

 [0027] Also, a first fin member comprising a first base plate and a plurality of first fins standing on the first base plate, a second base plate, and standing on the second base plate A second fin member comprising a plurality of second fins, wherein the first fin member and the second fin member include the plurality of first fins and the plurality of second fins. The plurality of metal fins are composed of the first fin and the second fin, and the adjacent first fin and second fin are combined. The second flow path is formed between the two.

 [0028] Since such a liquid cooling jacket is composed of a plurality of first fins and a plurality of second fins, even if the interval between the first fins and the interval between the second fins are widened, The distance between adjacent metal fins, that is, the distance between the first fin and the second fin can be reduced.

 [0029] In addition, the heat generating body is attached to the first base plate side, and the protruding length of the first fin is set to be the same as or shorter than the protruding length of the second fin, 2 The fin and the first base plate are thermally connected.

 [0030] In such a liquid cooling jacket, the first fin has a protruding length that is the same as the protruding length of the second fin, or shorter than the protruding length of the second fin. When the member and the second fin member are combined, the plurality of second fins securely contact the first base plate, and the plurality of second fins and the first base plate are joined so as to be capable of heat exchange. Can be configured. Then, the heat of the heat generating body attached to the first base plate side is transmitted to the plurality of first fins and the plurality of second fins via the first base plate. This heat can then be transferred to the heat transport fluid flowing through the second flow path between the first fin and the second fin.

 [0031] The jacket main body includes a jacket main body having a fin housing chamber that houses the plurality of metal fins, and a sealing body that seals the fin housing chamber, and surrounds the fin housing chamber. The joint portion of the peripheral wall and the sealing body is friction stir welded, and the start end and the end of the friction stir weld overlap

[0032] According to such a liquid cooling jacket, since the start end and the end end in the friction stir welding overlap, the peripheral wall of the jacket main body and the sealing body can be satisfactorily joined. it can. This makes it difficult for the heat transport fluid to leak to the outside.

 In addition, since the sealing body and the jacket body are joined by friction stir welding without using brazing material, there is no possibility that the heat transport fluid (refrigerant) is contaminated by brazing material. There is no risk of corrosion of brazing material or other equipment such as micropumps and radiators that make up the system.

 [0033] Further, the plurality of metal fins are erected on the sealing body and are integral with the sealing body.

 [0034] According to such a liquid cooling jacket, since the plurality of metal fins and the sealing body are a single body, the fin housing chamber is sealed with the sealing body, and at the same time, the plurality of metal fins are sealed. The fin can be arranged at a predetermined position in the fin housing chamber. That is, the production process of the liquid cooling jacket can be reduced, and the production can be easily performed and the production cost can be reduced. In addition, a plurality of fins made of metal and a sealing body in this way are, for example, a plate made of an aluminum alloy (plate material) as shown in a fifth embodiment to be described later. It can be obtained by paying.

 In addition, if the fin and the sealing body are formed as a single body by a skive cage or the like, it is naturally not necessary to join the fin and the sealing body with a brazing material or the like. Thus, contamination of the heat transport fluid can be prevented.

 Furthermore, since the fin and the sealing body are a single body, the heat transferability between them is high. Therefore, if a heat generating body such as a CPU is attached to the sealing body, the heat of the heat generating body is transferred well to the plurality of fins through the sealing body. As a result, the heat dissipation performance of the heat generator in the liquid cooling jacket is enhanced.

 [0035] Further, the friction stir welding is performed while applying a jig to the peripheral wall so that the peripheral wall is not deformed outward.

[0036] According to such a liquid cooling jacket, when the friction stir welding is performed while applying a jig to the peripheral wall, the peripheral wall is deformed outward by the friction stir welding. In addition, by applying the jig in this way, the distance (gap) between the outer peripheral surface of the shoulder and the outer peripheral surface of the peripheral wall in the tool used for friction stir welding where the peripheral wall is thin is, for example, 2. Omm or less. However, friction stir welding can be performed without deforming the peripheral wall. [0037] In addition, the length of the pin of the tool used for the friction stir welding is 60% or less of the thickness of the sealing body.

[0038] According to such a liquid cooling jacket, when the length of the pin of the tool is 60% or less of the thickness of the sealing body, it is deformed to the sealing body strength fin housing chamber side by friction stir welding. become. Thereby, it is prevented that the capacity | capacitance of a fin storage chamber becomes small.

[0039] Further, in the friction stir welding, the removal position of the tool is removed from the mating portion!

[0040] According to such a liquid cooling jacket, the removal position of the tool is removed from the mating portion force, so that no pin trace is formed at the mating portion. Thereby, a jacket main body and a sealing body can be joined suitably.

[0041] In addition, a metal honeycomb body having a plurality of pores is provided, and the pores are the second flow paths.

[0042] According to such a liquid cooling jacket, since the pores of the her cam body are used as the second flow path, the heat from the heat generating body flows through the second flow path through the honeycomb body. Can be transferred to heat transport fluid.

 [0043] Also, a metal heat exchange sheet having a corrugated cross section and a metal jacket main body to which the heat exchange sheet is fixed so as to be able to exchange heat, the space between the heat exchange sheet and the jacket main body. In addition, the second flow path is formed.

[0044] Such a liquid cooling jacket can be easily configured by fixing a heat exchange sheet having a corrugated cross section to the jacket body so that heat exchange is possible.

[0045] The metal is aluminum or an aluminum alloy.

[0046] According to such a liquid cooling jacket, the metal is made of aluminum or an aluminum alloy, so that the weight is reduced.

[0047] In addition, the heat transport fluid intake port communicating with the first flow path and the heat transport fluid discharge port communicating with the third flow path are arranged symmetrically with respect to the heat generator. It is characterized by being.

[0048] According to such a liquid cooling jacket, the heat transport fluid supplied to the first flow path of the intake locus can easily flow through the second flow path in the vicinity of the heat generator. This generates heat in the heat transport fluid Heat exchange can be suitably performed with the body.

 [0049] Further, the intake port and the discharge port are arranged so as to be relatively distant from each other.

 [0050] According to such a liquid cooling jacket, the heat transport fluid supplied to the first flow path of the intake rocker can easily flow through the plurality of second flow paths. Accordingly, heat exchange can be suitably performed between the heat transport fluid that flows through the entire plurality of second flow paths and the heat generator.

 [0051] Further, the intake port and the discharge port are arranged so as to be close to the heat generating body.

 [0052] According to such a liquid cooling jacket, the heat transport fluid supplied to the first flow path of the intake rocker can easily flow through the second flow path near the heat generator at a high flow rate. Thereby, heat exchange can be suitably performed between the heat transport fluid and the heat generator that circulate at this high flow rate. That is, for example, it is not attached to the liquid cooling jacket via a heat diffusion sheet 102 (refer to FIG. 3) called a heat generation body heat spreader such as a CPU, and the heat of the heat generation body is distributed over the entire liquid cooling jacket. In such a case, it is possible to efficiently dissipate heat by allowing the heat transport fluid to flow through the second flow path in the vicinity of the heat generator at a high flow rate in this way.

 [0053] Further, the heat generating body is a CPU.

 [0054] According to such a liquid cooling jacket, it is possible to efficiently exchange heat between the CPU and the heat transport fluid to cool the CPU.

 The invention's effect

 [0055] According to the present invention, it is possible to provide a liquid cooling jacket capable of efficiently cooling a heat generating body such as a CPU. Further aspects and advantages of the present invention, as well as other effects and further features, will become more apparent from the detailed description of exemplary and non-limiting embodiments of the present invention described below with reference to the accompanying drawings. It will be clear.

 Brief Description of Drawings

FIG. 1 is a configuration diagram of a liquid cooling system according to a first embodiment.

 FIG. 2 is an overall perspective view of the liquid cooling jacket according to the first embodiment.

 FIG. 3 is an overall perspective view of the downward force of the liquid cooling jacket according to the first embodiment.

FIG. 4 is a perspective view of the liquid cooling jacket according to the first embodiment, with the lid unit omitted. Indicates.

 FIG. 5 is a plan view of the liquid cooling jacket according to the first embodiment.

 6 is an XX cross-sectional view of the liquid cooling jacket according to the first embodiment shown in FIG.

[7] FIG. 7 is an exploded perspective view of the liquid cooling jacket according to the first embodiment.

8] A graph schematically showing the effect of the liquid cooling jacket according to the first embodiment.

[9] FIG. 9 is an overall perspective view of the liquid cooling jacket according to the second embodiment, showing a state in which the lid unit is omitted.

 FIG. 10 is a YY sectional view of the liquid cooling jacket according to the second embodiment shown in FIG.

圆 11] An overall perspective view of a liquid cooling jacket according to a third embodiment.

FIG. 12 is a plan view of a liquid cooling jacket according to a third embodiment.

圆 13] An overall perspective view of the liquid cooling jacket according to the fourth embodiment, showing a state where the lid unit is omitted.

 14 is a ZZ cross-sectional view of the liquid cooling jacket according to the fourth embodiment shown in FIG.

FIG. 15 is an enlarged view of the ZZ cross-sectional view shown in FIG.

 FIG. 16 is a perspective view showing a first method for producing a fin member of a liquid cooling jacket according to a fourth embodiment, where (a) shows before cutting and (b) shows after cutting.

 FIG. 17 is a perspective view showing a second production method of the fin member of the liquid cooling jacket according to the fourth embodiment, where (a) shows before cutting and (b) shows after cutting.

 FIG. 18 is a perspective view showing friction stir welding according to a fourth embodiment.

圆 19] A sectional view showing friction stir welding according to a fourth embodiment.

20] A plan view showing the movement of the tool in the friction stir welding according to the fourth embodiment.

FIG. 21 is a cross-sectional view of a liquid cooling jacket according to a fifth embodiment.

FIG. 22 is an enlarged view of the cross-sectional view shown in FIG.

FIG. 23] A diagram showing a method for producing a fin member of a liquid cooling jacket according to a fifth embodiment, wherein (a) shows during skive caloe and (b) shows after skive processing.

24] A diagram showing a method for producing a fin member of the liquid cooling jacket according to the fifth embodiment, showing a state after removing a part of the skive fin shown in FIG. 23 (b). 25] A sectional view showing friction stir welding according to the fifth embodiment.

 FIG. 26 is a cross-sectional view of a liquid cooling jacket according to a sixth embodiment, where (a) shows a state after assembly and (b) shows a state before assembly.

 FIG. 27 is a cross-sectional view of a liquid cooling jacket according to a seventh embodiment, where (a) shows a state after assembly and (b) shows a state before assembly.

 FIG. 28 is a cross-sectional view of a liquid cooling jacket according to an eighth embodiment, where (a) shows a state after assembly and (b) shows a state before assembly.

 FIG. 29 is a plan view of a liquid cooling jacket according to a ninth embodiment.

FIG. 30 is a plan view of a liquid cooling jacket according to a tenth embodiment.

[31] This is a graph showing the relationship between the number of turns and the thermal resistance.

FIG. 32 is a cross-sectional view of a flat tube bundle according to a modification.

 FIG. 33 is a cross-sectional view of a liquid cooling jacket according to a modification, where (a) shows a state after assembly and (b) shows a state before assembly.

 FIG. 34 is a cross-sectional view of a liquid cooling jacket according to a modification.

 FIG. 35 is a perspective view of a liquid cooling jacket according to a modification.

36] A graph showing the relationship between the groove width W1, thermal resistance and pressure loss.

 FIG. 37 is a graph showing the relationship between fin thickness, T1Z groove width W1, and thermal resistance.

 FIG. 38 is a graph showing the relationship between groove width W1 and fin thickness T1Z groove width W1.

[39] This is a graph showing the relationship between the depth D1 of the groove and the thermal resistance.

 FIG. 40 is a graph showing the relationship between the groove width W1 and the groove depth D1.

Explanation of symbols

 A1 1st flow path

 B1 Second channel group

 Bla second channel

 C1 3rd flow path

 J1 liquid cooling jacket

 10 Jacket body

10a space 10c space

 11 Bottom wall

 12 perimeter wall

 15 steps

 20 Flat tube bundle

 21 Flat tube

 21a Hollow part

 21b wall

 21c partition wall

 31 Lid body

 31a Inlet

 31b outlet

 101 CPU (heat generator)

 200 tools

 201 pin

 202 Shonoreda

 210 Jig

 K friction stir weld

 L5 pin length

 L6 Distance between the outer peripheral surface of the tool and the outer peripheral surface of the peripheral wall

PI matching section

 Q Overlap part

 Tl Fin thickness

 T2 lid body thickness

 Ti l Wall thickness

 Wl Groove width

 Wl l Step width

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

[0059] << First Embodiment >>

 First, the liquid cooling system and the liquid cooling jacket according to the first embodiment will be described with reference to FIGS. FIG. 1 is a configuration diagram of a liquid cooling system according to the first embodiment. FIG. 2 is an overall perspective view of the liquid cooling jacket according to the first embodiment. FIG. 3 is an overall perspective view of the downward force of the liquid cooling jacket according to the first embodiment. FIG. 4 is a perspective view of the liquid cooling jacket according to the first embodiment, showing a state in which the lid unit is omitted. FIG. 5 is a plan view of the liquid cooling jacket according to the first embodiment, omitting the intake pipe and the discharge noise. 6 is an XX cross-sectional view of the liquid cooling jacket according to the first embodiment shown in FIG. FIG. 7 is an exploded perspective view of the liquid cooling jacket according to the first embodiment. FIG. 8 is a graph schematically showing the effect of the liquid cooling jacket according to the first embodiment.

[0060] <Configuration of liquid cooling system>

 As shown in FIG. 1, the liquid cooling system S1 according to the first embodiment is a system mounted on a personal computer main body 120 (electronic device) of a tower-type personal computer, and includes a CPU 101 constituting the personal computer main body 120. This is a system that cools (heat generators). The liquid cooling system S1 includes a liquid cooling jacket J1 (see Fig. 3) where the CPU 101 is installed in place, a radiator 121 (heat dissipating means) that releases heat transported by cooling water (heat transport fluid), and cooling Micropump 122 (heat transport fluid supply means) that circulates water, expansion of cooling water due to temperature change, reserve tank 123 that absorbs Z shrinkage, and flexible tube 124 that connects these, and transports heat Mainly equipped with cooling water. For example, an ethylene glycol antifreeze is used as the cooling water.

 When the micropump 122 is activated, cooling water circulates through these devices.

[0061] <Structure of liquid cooling jacket>

Next, the liquid cooling jacket J1 constituting the liquid cooling system S1 will be described in detail. As shown in FIG. 2 and FIG. 3, the liquid cooling jacket J1 has a CPU 101 attached to the center (predetermined position) on the lower side (back side) via a heat diffusion sheet 102 (heat spreader). With the CPU 101 attached in this way, cooling water flows through the liquid cooling jacket J1. As a result, the liquid cooling jacket Jl receives the heat generated by the CPU 101 and also exchanges heat with the cooling water circulating inside, thereby transferring the heat received from the CPU 101 to the cooling water. As a result, the CPU 101 It is designed to be cooled efficiently. The thermal diffusion sheet 102 is a sheet for efficiently transferring the heat of the CPU 101 to the bottom wall 11 of the jacket body 10 described later, and is formed of a metal having high thermal conductivity such as copper, for example. .

 As shown in FIGS. 4 to 7, the liquid cooling jacket J1 mainly includes a jacket body 10, a flat tube bundle 20 (tube bundle), and a lid unit 30. Unless otherwise specified, the jacket body 10, the flat tube bundle 20, and the lid unit 30 are also formed of aluminum or aluminum alloy force. As a result, the liquid cooling jacket J1 is lightweight and easy to handle.

 [0063] <Jacket body>

 The jacket body 10 is a shallow box that opens on the upper side (one side) (see FIG. 7), has a bottom wall 11 and a peripheral wall 12, and accommodates the flat tube bundle 20 inside thereof. It has a storage room (see Fig. 7). Such a jacket body 10 is produced by, for example, die casting (die casting), forging, forging or the like. Further, the jacket main body 10 has an alignment portion 14 having a shape corresponding to a notch 31c of the lid main body 31 described later at a part of the opening edge.

 [0064] <Flat tube bundle>

 The flat tube bundle 20 has a space 10a and a space 10c on both ends in the jacket body 10 (see FIGS. 4 and 5), and is made of a brazing material such as an A1-Si—Zn-based aluminum alloy. It is fixed to the bottom wall 11 of the jacket body 10 so that heat exchange (heat transfer) is possible (see FIG. 6). The space 10a functions as the first flow path A1, and the space 1 Oc functions as the third flow path C1.

The flat tube bundle 20 is obtained by bundling and joining a predetermined number of flat tubes 21 in the thickness direction (see FIGS. 6 and 7). Each flat tube 21 has one or a plurality of (two in the first embodiment) hollow portions 21a. Each hollow portion 21a functions as a second flow path Bla through which cooling water flows. That is, each of the second flow paths Bla has a rectangular cross-sectional view, and side walls (second flow path constituting parts) composed of the peripheral walls 21b and 21b of the flat tube 21 located on both sides thereof. The upper wall portion (second flow path constituting portion) or the lower wall portion (second flow passage constituting portion) composed of the peripheral wall 21b or the partition wall 21c positioned on the upper and lower sides thereof is surrounded. Accordingly, the flat tube bundle 20 has a plurality of second flow paths Bla, that is, a second flow path group B1 composed of a plurality of second flow paths Bla.

 [0066] Here, as described above, the CPU 101 is mounted at a substantially central position on the lower side (outside) of the bottom wall 11 (see FIG. 3). As a result, the heat of the CPU 101 is transferred via the bottom wall 11 to the peripheral wall 21b surrounding the hollow portion 21a (second flow path Bla) of each flat tube 21 and the partition wall 21c that cuts the adjacent hollow portion 21a. It is supposed to be. Then, the thermal force transmitted to the peripheral wall 21b and the partition wall 21c (heat exchange part) is transmitted to the cooling water flowing through each second flow path Bla. In this way, the CPU 101 mainly exchanges heat with the cooling water flowing through the second flow path group B1.

 In addition, by forming a flat tube bundle 20 by bundling multiple flat tubes 21, the peripheral wall 2 lb (heat exchange part) that transfers heat from the CPU 101 and directly exchanges heat with cooling water increases. Therefore, heat can be efficiently exchanged between the CPU 101 and the cooling water. As a result, the CPU 101 can be efficiently cooled.

 [0067] [First flow path, second flow path group (multiple second flow paths), third flow path]

 Here, the first flow path Al, the second flow path group B1 (a plurality of second flow paths Bla), and the third flow path C1 will be further described.

 The first channel A1 is a channel through which cooling water is supplied from the micropump 122, and is arranged on the micropump 122 side (upstream side of the second channel group B1).

 The second flow path group B1 is disposed downstream of the first flow path A1, and each second flow path Bla constituting the second flow path group B1 is branched from the first flow path A1. . Thus, the cooling water is distributed from the first flow path A1 and flows into each second flow path Bla.

 The third flow path C1 is disposed on the downstream side of the second flow path group Bl, that is, the plurality of second flow paths Bla, and collects the plurality of second flow paths Bla. As a result, the cooling water flowing out from each second flow path Bla is collected in the third flow path C1 and then discharged to the outside of the liquid cooling jacket J1.

[0068] The channel cross-sectional areas of the first channel A1 and the third channel C1 are determined from the channel cross-sectional area of each second channel Bla. It is set large. The flow path length of each second flow path Bla (the length of each flat tube 21) is as follows for one flow path that meanders through all of the portions corresponding to the flat tube bundle 20 according to the conventional technology. , Has become dramatically shorter.

 Therefore, the pressure loss experienced by the cooling water flowing in the order of the first flow path Al, each second flow path Bla, and the third flow path C1 hardly occurs in the first flow path A1 and the third flow path C1. In each second flow path Bla, the pressure loss received from the single meandering flow path is drastically reduced. As a result, the rated output of the micropump 122 that supplies the cooling water to the liquid cooling jacket J1 can be lowered, and the micropump 122 can be reduced in size and noise.

 [0069] <Lid unit>

 As shown in FIG. 7, the lid unit 30 mainly includes a lid main body 31, an intake pipe 32, and a discharge pipe 33.

 [0070] [Cover body]

 The lid body 31 is joined and fixed to the jacket body 10 so as to cover the jacket body 10 containing the flat tube bundle 20. The lid body 31 is formed with the force of the intake port 31a communicating with the first flow path A1 (space 10a) and the discharge port 31b communicating with the third flow path C1 (space 10c) (see FIG. 7). .

 Further, the lid body 31 has a cutout portion 31c that is cut out, and the shape of the cutout portion 31c matches the alignment portion 14 of the jacket body 10. Thereby, the lid body 31 (lid unit 30) is combined with the jacket body 10 only in a predetermined direction.

[0071] (take-in port, discharge port)

As shown in FIG. 5, the intake port 31a and the discharge port 31b are arranged symmetrically with respect to the CPU 101 in plan view, and are arranged so as to be relatively distant from each other. In other words, the intake port 31a, the discharge port 31b, and the CPU 101 are arranged on a diagonal line of the liquid cooling jacket J1 having a square shape in plan view. More specifically, the intake port 31a is disposed on the upper left side in FIG. 5, while the discharge port 31b is disposed on the lower right side in FIG. 5, and the intake port 3 la and the discharge port 3 lb. The CPU 101 is arranged at a substantially middle position (approximately the center of the liquid cooling jacket J 1 having a square shape). Therefore, the cooling water from the intake pipe 32 is supplied approximately uniformly to the entire second flow path group B1 (the entire plurality of second flow paths Bla) via the intake port 31a and the first flow path A1. It is supposed to be done. Then, heat is efficiently exchanged between the entire cooling water flowing through the entire second flow path group B1 and the CPU 101! /.

 Next, the cooling water flowing out from the plurality of second flow paths Bla is collected in the third flow path C1, and then discharged to the outside of the liquid cooling jacket J1 through the discharge port 31b and the discharge pipe 33. It is.

[0072] [take-in pipe, discharge pipe]

 The intake pipe 32 is fixed to the lid body 31. Connected to the intake pipe 32 is a flexible tube 124 that leads to a micropump 122 (see FIG. 1) upstream of the liquid cooling jacket J1. Then, the cooling water from the micropump 122 is supplied to the first flow path A1 through the hollow portion of the intake pipe 32 and the intake port 31a.

 The discharge nove 33 is fixed to the lid body 31. Connected to the discharge pipe 33 is a flexible tube 124 leading to a radiator 121 (see FIG. 1) on the downstream side of the liquid cooling jacket J1. The cooling water collected in the third flow path C1 is discharged to the outside of the liquid cooling jacket J1 through the discharge port 31b and the hollow portion of the discharge pipe 33.

[0073] The intake noise 32 and the discharge pipe 33 are fixed to the upper surface side of the lid body 31 in a standing state. Accordingly, the flexible tubes 124 and 124 can be connected to the intake pipe 32 and the discharge nozzle 33 only from the upper surface side of the liquid cooling jacket J1. That is, in the personal computer main body 120 with limited space (see FIG. 1), the flexible tubes 124 and 124 (see FIG. 1) connected to the liquid cooling jacket J1 can be easily routed.

 [0074] <Effects of liquid cooling jacket>

 Next, the function and effect of the liquid cooling jacket J1 will be described.

When the personal computer main unit 120 (Fig. 1) is turned on, the CPU 101 operates and begins to generate heat. Then, the heat of the CPU 101 is transmitted to the bottom wall 11 of the jacket body 10 via the thermal diffusion sheet 102, and further transmitted to the peripheral wall 21b and the partition wall 21c of each flat tube 21 that mainly forms the flat tube bundle 20. On the other hand, in conjunction with turning on the power source of the personal computer main body 120, the micropump 122 operates and the cooling water circulates. Then, in the liquid cooling jacket J1, the cooling water flows in the order of the first flow path Al, the second flow path group B1 (a plurality of second flow paths Bla), and the third flow path C1.

 [0076] Then, heat is exchanged between the peripheral wall 21b and the partition wall 21c of each flat tube 21 and the cooling water flowing through each second flow path Bla, and the heat of the CPU 101 transferred to the peripheral wall 21b and the partition wall 21c. However, it is transmitted (moved) to the cooling water, and the cooling water receives heat.

 Next, the cooling water received in each second flow path Bla is collected in the third flow path C1, and then discharged to the outside of the liquid cooling jacket J1 via the discharge port 3 lb and the discharge pipe 33. The discharged cooling water is supplied to the radiator 121 through the flexible tube 124, and the heat of the cooling water is radiated from the radiator 121. Then, the cooling water whose temperature has decreased flows through the reserve tank 123 and the flexible tube 124 to the micro pump 122, and is then supplied again to the liquid cooling jacket J1.

 [0077] Heat transfer from the CPUlOl to the thermal diffusion sheet 102, the bottom wall 11, the peripheral wall 21b and the partition wall 21c of each flat tube 21, and (2) cooling from the peripheral wall 21b and the partition wall 21c. The heat transfer to the water and (3) the radiation of the cooling water in the radiator 121 are continuously performed, so that the CCU 101 is efficiently cooled.

 Further, the thermal power of the CPU 101 is distributed and transmitted to the peripheral walls 21b and the partition walls 21c of the plurality of flat tubes 21, and the heat of each of the peripheral walls 21b and the partition walls 21c is transmitted to the cooling water flowing through each second flow path Bla. CPU101 can be cooled efficiently.

 [0078] Further, the cooling water supplied to the liquid cooling jacket J1 has a short channel length and mainly heat in the liquid cooling jacket J1 via the first channel A1 having a large channel cross-sectional area. After flowing through the plurality of second flow paths Bla (second flow path group B1) to be exchanged, they are collected and discharged in the third flow path C1 having a large cross-sectional area of the flow path, so that the cooling water flows in the liquid cooling jacket J1. The pressure loss received is getting smaller. Thereby, the micropump 122 can be reduced in size, and the application range of the liquid cooling system S1 is widened.

Furthermore, according to such a liquid cooling jacket J1 (invention product), as shown in FIG. 8, compared to the conventional liquid cooling jacket (conventional product) having one long meandering second flow path. Cooling water can be passed with low pressure loss and high flow rate. That is, as shown in Figure 8. Thus, with respect to the intersection Ml of the pressure loss-flow rate curve of one micropump and the flow rate curve according to the conventional product, the intersection point M2 of the pressure loss-flow rate curve and the flow rate curve according to the present invention is It has been shifted to the lower side, and according to the liquid cooling jacket J1 (product of the present invention), it can be seen that the pressure loss is small and the flow rate is high.

 [0079] <Method for producing liquid-cooled jacket>

 Next, a method for manufacturing (manufacturing) the liquid cooling jacket J1 will be described with reference mainly to FIG. The manufacturing method of the liquid cooling jacket J1 mainly includes a first step of manufacturing the flat tube bundle 20 and a second step of joining and fixing the flat tube bundle 20 to the jacket body 10.

 [0080] <First step>

 A plurality of flat tubes 21 are bundled while being joined by an appropriate means. Next, both ends of the bundle are cut and ground to prepare a flat tube bundle 20.

 [0081] <Second step>

The flat tube bundle 20, at a predetermined position of the bottom wall 11 of the jacket body 10, with suitable means (A1- Si- brazing material and flux of Z _n, etc.), heat exchangeably connected and fixed. When the flat tube bundle 20 is fixed to the jacket body 10, the above-described space 10a (first flow path A1) and space 10c (third flow path C1) are secured on both ends of the flat tube bundle 20.

 [0082] Thereafter, the lid body 31 with the intake pipe 32 and the discharge nozzle 33 fixed in place is joined and fixed to the jacket body 10 by an appropriate means. In this way, the liquid cooling jacket J1 can be obtained.

 After fixing the lid body 31 to the jacket body 10, the intake pipe 32 and the discharge pipe 33 may be fixed to the lid body 31! /.

 As described above, according to the method for manufacturing the liquid cooling jacket J1 according to the first embodiment, the flat tube bundle 20 is fixed to the jacket main body 10 as a plurality of flat tubes 21 and the lid main body 31 is fixed. The liquid cooling jacket J1 can be obtained by a simple process of fixing.

 [0084] <Second Embodiment>

Next, a liquid cooling jacket according to a second embodiment will be described with reference to FIGS. FIG. 9 is an overall perspective view of the liquid cooling jacket according to the second embodiment, showing a state in which the lid unit is omitted. FIG. 10 shows a YY cut of the liquid cooling jacket according to the second embodiment shown in FIG. FIG.

 [0085] As shown in FIGS. 9 and 10, the liquid cooling jacket J2 according to the second embodiment includes a flat tube bundle 23 instead of the flat tube bundle 20 of the liquid cooling jacket J1 according to the first embodiment. It is characterized by. Although the flat tube bundle 23 has the same external dimensions as the flat tube bundle 20 according to the first embodiment, a plurality of thin plate-like flat tubes 24 (three in FIGS. 9 and 10) can be bundled together. It consists of Each flat tube 24 has a plurality of (12 in FIG. 9 and FIG. 10) hollow portions 24a therein, and each hollow portion 24a serves as a second flow path B2a. As a result, the flat tube bundle 23 has a second flow path group B2 composed of a plurality of second flow paths B2a.

 Here, since each flat tube 24 has a thin plate shape, the number of hollow portions 24a formed therein (12 in FIG. 9) is formed in the flat tube 21 according to the first embodiment. More than the number (2) of the hollow portions 21a formed. As a result, the number (three) of the flat tubes 24 constituting the flat tube bundle 23 is less than the number of the flat tubes 21 (see FIG. 7, 20) constituting the flat tube bundle 20 according to the first embodiment. That is, the flat tube bundle 23 according to the second embodiment can reduce the number of flat tubes 24 to be bundled (stacked) with respect to the flat tube bundle 20 according to the first embodiment, and can be configured easily without trouble. can do.

 [0087] <Third Embodiment>

 Next, a liquid cooling jacket according to a third embodiment will be described with reference to FIGS. FIG. 11 is an overall perspective view of the liquid cooling jacket according to the third embodiment. FIG. 12 is a plan view of a liquid cooling jacket according to the third embodiment.

 [0088] <Structure of liquid cooling jacket>

 As shown in FIGS. 11 and 12, the liquid cooling jacket J3 according to the third embodiment is formed at a position where the intake port 34a and the discharge port 34b are different from the liquid cooling jacket J1 according to the first embodiment. A lid body 34 is provided.

The intake port 34a communicates with a substantially central position of the space 10a (first flow path A1), and cooling water is supplied to a substantially central position of the space 10a. The discharge port 34b communicates with a substantially central position of the space 10c (third flow path), and this substantially central position force also discharges the cooling water. The intake port 34a and the discharge port 34b are arranged symmetrically with respect to the CPU 101 in a plan view, and are arranged at positions approaching the CPU 101. The lid body 34 also has a cutout 34c having a shape corresponding to the alignment portion 14 of the jacket body 10 in the same manner as the lid body 31 according to the first embodiment.

[0089] <Operation and effect of liquid cooling jacket>

 Next, the effect of the liquid cooling jacket J3 will be briefly described.

 By adopting a configuration in which the intake port 34a and the exhaust port 34b are arranged at positions close to the CPU 101, the cooling water power supplied from the intake port 34a to the first flow path A1 (space 10a) near the cooling hydraulic power CPU101. It becomes easy to distribute preferentially to 2 flow paths Bla. As a result, heat exchange can be suitably performed between the cooling water and the CPU 101, and the CPU 101 can be efficiently cooled.

[0090] <Fourth embodiment>

 Next, a liquid cooling jacket according to a fourth embodiment will be described with reference to FIGS. FIG. 13 is an overall perspective view of the liquid cooling jacket according to the fourth embodiment, showing a state in which the lid unit is omitted. FIG. 14 is a Z-Z sectional view of the liquid cooling jacket according to the fourth embodiment shown in FIG. FIG. 15 is an enlarged view of the Z-Z sectional view shown in FIG. FIG. 16 is a perspective view showing a first method for producing a fin member of a liquid cooling jacket according to the fourth embodiment, where (a) shows before cutting and (b) shows after cutting. FIG. 17 is a perspective view showing a second method for producing the fin member of the liquid cooling jacket according to the fourth embodiment, where (a) shows before cutting and (b) shows after cutting. FIG. 18 is a perspective view showing friction stir welding according to the fourth embodiment. FIG. 19 is a cross-sectional view showing friction stir welding according to the fourth embodiment. FIG. 20 is a plan view showing the movement of the tool in the friction stir welding according to the fourth embodiment.

[0091] <Structure of liquid cooling jacket>

 As shown in FIGS. 13 and 14, the liquid cooling jacket J4 according to the fourth embodiment is replaced by a fin member 25 made of aluminum or aluminum alloy instead of the flat tube bundle 20 of the liquid cooling jacket J1 according to the first embodiment. It is provided with.

Note that the jacket body 10 according to the fourth embodiment includes a fin housing chamber that houses the fin member 25 on the inner side thereof, and the fin housing chamber is surrounded by the peripheral wall 12. The fin member 25 is fixed to the bottom wall 11 by brazing and is accommodated in the fin housing chamber, and the lid main body 31 (sealing body) covers the opening of the jacket main body 10 so as to accommodate the fin. Room Sealed (see Figure 14).

 [0092] Ku fin member>

 As shown in FIG. 14, the fin member 25 includes a base plate 25a and a plurality of fins 25b erected on the base plate 25a. The base plate 25a is joined and fixed to the bottom wall 11 of the jacket body 10 so as to allow heat exchange. Therefore, the heat is transmitted to the fins 25b via the heat and heat diffusion sheet 102 and the bottom wall 11 of the CPU 101. Further, the upper ends of the fins 25b are in contact with the back surface of the lid body 31. The base plate 25a and the jacket main body 10 are preferably joined to each other by a brazing material having an aluminum alloying force such as A1-Si—Zn so that heat exchange can be ensured.

 A space between adjacent fins 25b and 25b is a second flow path B3a. In other words, the fin member 25 has a plurality of second flow paths B3a, that is, a second flow path group B3 including a plurality of second flow paths B3a.

 [0093] As shown in FIG. 15, the distance between adjacent fins 25b and 25b, that is, the groove width W1 that is the width of the second flow path B3a is designed to be 0.2-1. . As a result, the thermal resistance of the liquid cooling jacket J4 and the pressure loss experienced by the cooling water passing through the liquid cooling jacket J4 can be in a favorable range as will be described in the examples described later.

 [0094] Further, the groove width W1 and the thickness Tl of the fin 25b, that is, the thickness T1 of the fin 25b between the adjacent second flow paths B3a and B3a satisfy the relationship of the following equation (1). ing. As a result, the thermal resistance of the liquid cooling jacket J4 is reduced, and heat can be exchanged favorably between the CPU 101 and the cooling water.

 -0. 375 XW1 + 0. 875≤T1 / W1≤- 1. 875 XW1 + 3.275 (1)

[0095] Furthermore, the groove width W1 and the depth D1 (depth of the second flow path B3a) satisfy the relationship of the following equation (2). Thereby, the thermal resistance of the liquid cooling jacket J4 can be optimized.

 5 XW1 + 1≤D1≤16. 25 XW1 + 2. 75 (2)

[0096] << Effects of liquid cooling jacket >>

 Next, the function and effect of the liquid cooling jacket J4 will be briefly described.

The cooling water flows in the order of the first flow path Al, the second flow path group B3 (a plurality of second flow paths B3a), and the third flow path C1. Then, between the cooling water flowing through the second flow path group B3 and the plurality of fins 25b, Heat exchanged. As a result, the CPU 101 can be efficiently cooled.

<Method for Producing Fin Member of Liquid Cooling Jacket>

 Next, a method for producing (manufacturing) the fin member 25 of the liquid cooling jacket J4 will be exemplified.

[0098] <First production method of fin member>

 First, a first manufacturing method of the fin member 25 will be described with reference to FIG. As shown in FIG. 16 (a), a metal extrusion die 41 having a bottom plate 42 and a plurality of strips 43 standing on the bottom plate 42 is produced using a predetermined mold. And the fin member 25 provided with the base plate 25a (a part of the bottom plate 42) and a plurality of fins 25b (a part of the plurality of strips 43) is produced by cutting the extruded die 41 at a predetermined cut surface. (See Figure 16 (b)).

[0099] <Second production method of fin member>

 Next, a second manufacturing method of the fin member 25 will be described with reference to FIG. As shown in FIG. 17 (a), a plurality of grooves 44a are formed in a metal block 44 having a size corresponding to the outer shape of the fin member 25 using an appropriate cutting tool. Then, the fin member 25 including the base plate 25a and the plurality of fins 25b can be manufactured (see FIG. 17B).

 [0100] <Assembly of liquid cooling jacket>

 Next, in the assembly of the liquid cooling jacket J4, friction stir welding between the jacket main body 10 to which the fin member 25 is fixed and the lid unit 30 will be described with reference mainly to FIGS.

 As shown in FIG. 18, the cover unit 30 is put on the jacket body 10 to which the fin member 25 is fixed by brazing, while aligning the notch portion 31c and the alignment portion 14. As shown in FIG. 19, the opening edge of the jacket body 10 is stepped, and the lid body 31 is placed on the stepped portion 15 that is lowered by one step. The width W11 of the stepped portion 15 is set to be as small as possible, specifically about 0.1 to 0.5 mm, in order to secure the volume of the first flow path A1 and the third flow path C1 through which the cooling water flows. Is preferred.

[0101] Then, the joint P1 between the peripheral wall 12 and the lid body 31 is friction stir welded using the tool 200 for friction stir welding. Then, the friction stir weld K (See FIG. 15) is formed, and the peripheral wall 12 and the lid body 31 are joined. Here, the length L5 of the pin 201 of the tool 200 is preferably 60% or less of the thickness T2 of the lid body 31 that is the member to be joined. In this way, the force due to the material of the lid main body 31 allows the mating portion P1 of the jacket main body 10 to be adjusted by the pressing force of the tool 200 even if the width W11 of the stepped portion 15 is small. It becomes difficult to deform inside.

 The tool 200 is controlled and rotated by a machine tool (not shown) such as an NC and is driven along the mating portion P1 (see FIG. 18).

In addition, when performing friction stir welding, an appropriate jig 210 is applied to the peripheral surface of the peripheral wall 12 of the jacket body 10. As a result, even if the distance L6 (gap) between the outer peripheral surface of the shono-redder 202 of the TUNORE 200 and the outer peripheral surface of the peripheral wall 12 is 2. Omm or less, for example, the pressing force of the tool 200 is thin. This makes it difficult for the peripheral wall 12 to be deformed outward.

 In addition to this, when the peripheral wall 12 is thin like this, in order to avoid contact between the tool 200 and the jig 210, the surface of the jig 210 is 1.0-2 with respect to the surface of the mating part P1. It is preferable to lower it by about Omm.

Further, as shown in FIG. 20, the tool 200 is moved so that the start end and the end end in the friction stir welding overlap (see symbol Q). Thereby, the jacket main body 10 and the lid main body 31 are joined without a gap, and the cooling water leaks to the outside. Next, the tool 200 is removed from the mating part P1, and the pin 201 is removed. As a result, it is not formed in the extraction force matching portion P1 of the pin 201.

<Fifth Embodiment>

 Next, a liquid cooling jacket according to a fifth embodiment will be described with reference to FIGS. FIG. 21 is a cross-sectional view of the liquid cooling jacket according to the fifth embodiment. FIG. 22 is an enlarged view of the cross-sectional view shown in FIG. FIG. 23 is a view showing a method for producing the fin member of the liquid cooling jacket according to the fifth embodiment, where (a) shows a state during skive processing and (b) shows a state after skive processing. FIG. 24 is a view showing a method for producing the fin member of the liquid cooling jacket according to the fifth embodiment, and shows a state after removing a part of the skive fin shown in FIG. 23 (b). FIG. 25 is a cross-sectional view showing friction stir welding according to the fifth embodiment.

Note that different parts from the liquid cooling jacket J4 according to the fourth embodiment will be described. [0105] <Structure of liquid cooling jacket>

 As shown in FIG. 21, the liquid cooling jacket J5 according to the fifth embodiment mainly includes a jacket body 10C and a fin member 29 made of aluminum or aluminum alloy, and the CPU 101 is a bottom wall of the fin member 29. It is configured to be attached to 29a (sealing body).

 [0106] The jacket body 10C is a thin box having an opening on the lower side of FIG. 21 and having a fin housing chamber therein.

 As will be described later, the fin member 29 is obtained by skiving one plate 61 (see FIG. 23 (a)), and includes a bottom wall 29a and a plurality of metal fins 29b. . The plurality of fins 29b are erected on the bottom wall 29a, and are configured integrally with the bottom wall 29a. As a result, heat is transferred favorably between the bottom wall 29a and the fins 29b.

[0107] Further, the bottom wall 29a functions as a sealing body for sealing the fin housing chamber. Further, the space between the adjacent fins 29b and 29b functions as the second flow path B4a (see FIG. 22). The liquid cooling jacket J5 has a second flow path group B4 configured by a plurality of second flow paths B4a. In the state where the fin member 29 is attached to the jacket main body 10C, the first flow path A1 and the third flow path C1 are formed in the liquid cooling jacket J5 as in the fourth embodiment. (See Fig. 13).

[0108] <Effects of liquid cooling jacket >>

 Next, the effect of the liquid cooling jacket J5 will be briefly described.

 The cooling water flows in the order of the first flow path A1 (see FIG. 13), the second flow path group B4 (a plurality of second flow paths B4a), and the third flow path C1 (see FIG. 13). Then, heat is mainly exchanged between the cooling water flowing through the second flow path group B4 and the plurality of fins 25b, and the CPU 101 can be efficiently cooled. Here, since the bottom wall 29a and the fins 29b are integrally formed, the heat of the CPU 101 can be transferred well to the plurality of fins 29b, and as a result, heat can be dissipated well.

[0109] <Method for producing fin member of liquid cooling jacket>

 Next, a method of manufacturing (manufacturing) the fin member 29 of the liquid cooling jacket J5 using skive processing will be described with reference to FIGS.

As shown in FIG. 23 (a), a plate-like plate 61 is skived as described in JP-A-2001-326308, JP-A-2001-352020, and the like. For details, see plate 61 The cutting tool 62 is cut at an acute angle to cut and raise a part of the plate 61 to form a plurality of skive fins 63. This is repeated a plurality of times to produce a skive intermediate 64 having a plurality of skive fins 63 (see FIG. 23 (b)). Incidentally, the portion of the plate 61 that is not cut and raised serves as the bottom wall 29a (sealing body) of the fin member 29.

[0110] Subsequently, when the liquid cooling jacket J5 is configured by being assembled with the jacket body 10C, a plurality of first flow paths A1 and third flow paths C1 are formed in the liquid cooling jacket J5. Remove the outer periphery of skive fin 63 with a cutting tool. Then, as shown in FIG. 24, a fin member 29 including a bottom wall 29a and a plurality of fins 29b standing integrally therewith can be obtained.

 [0111] However, the production method of the fin member 29 is not limited to this, and the fin member 25 (see Fig. 16) after cutting the extruded die 41 according to the fourth embodiment or formed by grooving. The fin member 25 (see FIG. 17) may be configured by removing a part of the fin 25b.

 [0112] <Assembly of liquid cooling jacket>

 Then, as shown in FIG. 25, the jacket main body 10C and the fin member 29 are combined, and the mating portion P2 is friction stir welded while applying the jig 210 in the same manner as in the fourth embodiment. It should be noted that the length L5 of the pin 201 of the tool 200 is preferably 60% or less of the thickness T3 of the bottom wall 29a (sealing body) of the fin member 29 which is a member to be joined.

 [0113] <Sixth Embodiment>

 Next, a liquid cooling jacket according to a sixth embodiment will be described with reference to FIG. FIG. 26 is a cross-sectional view of the liquid cooling jacket according to the sixth embodiment, where (a) shows a completed state after assembly, and (b) shows before assembly.

 [0114] <Structure of liquid cooling jacket>

As shown in FIG. 26 (a), the liquid cooling jacket J6 according to the sixth embodiment includes a jacket body 10A (first fin member), a lid, and a liquid cooling jacket J1 according to the first embodiment. A unit 35 (second fin member) is provided. The jacket main body 10A includes a bottom wall 11 (first base plate) and a plurality of fins 13 erected on the bottom wall 11 at a predetermined interval. On the other hand, the lid unit 35 is separated from the lid body 36 (second base plate) and the lid body 36 by a predetermined distance. It is provided with a plurality of standing fins 37.

[0115] The jacket body 10A and the lid unit 35 are combined so that the plurality of fins 13 and the plurality of fins 37 are held together, and the lid body 36 is joined and fixed to the jacket body 10A. Yes. The entire fin of the liquid cooling jacket J6 is composed of a plurality of fins 13 and a plurality of fins 37 which are entangled. The space between adjacent fins 13 and fins 37 is a second flow path B5a, and the liquid cooling jacket J6 has a second flow path group B5 including a plurality of second flow paths B5a.

 [0116] In this way, by combining the plurality of fins 13 and the plurality of fins 37 to form the entire fin, the interval dl between the plurality of fins 13 and the interval d2 between the plurality of fins 37 are obtained. Each can be widened, and the groove force by a cutting tool or the like can be easily obtained.

 [0117] The protruding length L1 of the plurality of fins 13 from the bottom wall 11 is set to be the same as or shorter than the protruding length L2 of the plurality of fins 37 from the lid body 36, as shown in Fig. 26 (b). ing. The plurality of fins 37 and the bottom wall 11 are joined and fixed so as to be capable of heat exchange by an appropriate means, and are thermally connected. As a result, the thermal power of the CCU 101 on the jacket body 10A side (first base plate side) is also transmitted to the plurality of fins 37 connected by the plurality of fins 13 alone.

 That is, by setting the protruding length L1 of the plurality of fins 13 to be the same as or shorter than the protruding length L2 of the plurality of fins 37, when the jacket body 10A and the lid unit 35 are assembled, the plurality of fins 37 The tip (top) reliably contacts the bottom wall 11 of the jacket body 10A, and the plurality of fins 37 and the bottom wall 11 can be reliably thermally connected.

[0118] <Effects of liquid cooling jacket >>

 Next, the effect of the liquid cooling jacket J6 will be briefly described.

 According to such a liquid cooling jacket J6, when the cooling water flows through the second flow path group B5, it is transmitted to the cooling water circulating through the thermal power of the CPU 101 transmitted to the plurality of fins 13 and the plurality of fins 37. Cooled.

[Seventh Embodiment]>

Next, a liquid cooling jacket according to a seventh embodiment will be described with reference to FIG. FIG. 27 is a cross-sectional view of the liquid cooling jacket according to the seventh embodiment. (A) is a completed state after assembly. The state, (b) shows before assembly.

 [0120] <Structure of liquid cooling jacket>

 As shown in FIGS. 27 (a) and 27 (b), the liquid cooling jacket J7 according to the seventh embodiment is replaced with a plurality of flat tube bundles 20 of the liquid cooling jacket J1 according to the first embodiment. A metal Hercam body 26 having a pore 26a is provided.

[0121] Kuha cam body>

 The two-cam body 26 is joined and fixed to the bottom wall 11 of the jacket body 10 by an appropriate means so that heat exchange is possible. Therefore, the heat of the CPU 101 is transmitted to the peripheral wall 26b surrounding the pore 26a. Each pore 26a functions as a second flow path B6a through which cooling water flows. That is, the two-cam body 26 has a second flow path group B6 including a plurality of second flow paths B6a. Here, as shown in FIG. 27, the shape of the force hole 26a exemplifying the hermetic body 26 having the narrow hole 26a having a rectangular cross-sectional view is not limited to this, and may be a hexagon or the like. May be. Further, it is preferable that the her cam body 26 and the bottom wall 11 of the jacket main body 10 are joined to each other by a brazing material so that heat exchange can be surely performed.

[0122] <Effects of liquid cooling jacket>

 Next, the effect of the liquid cooling jacket J7 will be briefly described.

 The cooling water flows in the order of the first channel Al, the second channel group B6 (a plurality of second channels B6a), and the third channel C1. Then, heat is mainly exchanged between the peripheral wall 26b of the honeycomb body 26 and the cooling water flowing through the second flow path B5a, so that the heat of the peripheral wall 26b is transferred to the cooling water. As a result, the CPU 101 is efficiently cooled.

<Eighth Embodiment>

 Next, a liquid cooling jacket according to an eighth embodiment will be described with reference to FIG. FIG. 28 is a cross-sectional view of the liquid cooling jacket according to the eighth embodiment, where (a) shows a completed state after assembly, and (b) shows before assembly.

[0124] <Structure of liquid cooling jacket>

As shown in FIGS. 28 (a) and 28 (b), the liquid cooling jacket J8 according to the eighth embodiment has a cross-section instead of the flat tube bundle 20 of the liquid cooling jacket J1 according to the first embodiment. It is equipped with a corrugated metal heat exchange sheet 27 (brazing sheet). [0125] <Heat exchange sheet>

 The heat exchange sheet 27 is composed of a sheet body 27a formed of an aluminum alloy such as Al-Mn or Al-Fe-Mn, and a solder formed from an aluminum alloy such as A1-Si-Zn on the lower surface side. Material layer 27b. The heat exchange sheet 27 is bonded and fixed to the bottom wall 11 of the jacket main body 10 so as to allow heat exchange by partially melting and hardening the brazing material layer 27b. Therefore, the heat of the CPU 101 is transferred to the heat exchange sheet 27 through the bottom wall 11.

 [0126] A plurality of second flow paths B7a are formed between the heat exchange sheet 27 and the jacket body 10 or the lid body 31. That is, the liquid cooling jacket J8 has a second channel group B7 including a plurality of second channels B7a.

 [0127] <Effects of liquid cooling jacket >>

 Next, the function and effect of the liquid cooling jacket J8 will be briefly described.

 The cooling water flows in the order of the first flow path Al, the second flow path group B7 (a plurality of second flow paths B7a), and the third flow path C1. Then, heat is exchanged between the heat exchange sheet 27 and the cooling water flowing through the second flow path B7a, so that the heat of the heat exchange sheet 27 is transferred to the cooling water. As a result, the CPU 101 is efficiently cooled.

 [Ninth Embodiment] >>

 Next, a liquid cooling jacket according to a ninth embodiment will be described with reference to FIG. FIG. 29 is a plan view of the liquid cooling jacket according to the ninth embodiment. In FIG. 29, the lid body is removed for easy understanding.

 [0129] <Structure of liquid cooling jacket>

As shown in FIG. 29, the liquid cooling jacket J9 according to the ninth embodiment includes one flat tube bundle 20 but includes three flat tube bundles 20 in the liquid cooling jacket J1 according to the first embodiment. The three flat tube bundles 20 are arranged in a line in the jacket body 10B so that the hollow portions 21a (second flow paths Bla) of the flat tube bundles 20 are in the same direction. Further, the three flat tube bundles 20 have a space 10d between the upstream flat tube bundle 20 and the midstream flat tube bundle 20 in the jacket main body 10B, and between the midstream flat tube bundle 20 and the downstream flat tube bundle 20. With 10 d installed, they can contact the bottom wall 11 of the jacket body 10B so that they can exchange heat. Go-Fixed.

 [0130] The spaces 10d and 10d function as fourth flow paths El and El (connection flow paths) that connect the second flow path group B1 of the flat tube bundle 20 in series. The channel cross-sectional area of the fourth channel E1 is set larger than the channel cross-sectional area of the second channel Bla constituting each second channel group B1. That is, the liquid cooling jacket J9 has three second flow path groups Bl, Bl, B1 (second flow path group portions) arranged in series.

 [0131] <Effects of liquid cooling jacket>

 Next, the effect of the liquid cooling jacket J9 will be briefly described.

 Cooling water is the first channel Al, the second channel group Bl upstream, the fourth channel El, the second channel group B 1 in the middle stream, the fourth channel El, the second channel group Bl downstream, Circulates in the order of the third flow path C1. That is, the cooling water flows in series through the three second flow path groups Bl, Bl, B1. Here, since the cooling water passes through the fourth flow path E1 between the adjacent second flow path groups Bl and B1, the pressure loss received by the cooling water in the fourth flow path E1 is reduced. . That is, by interposing the fourth flow path E1 having a large flow cross-sectional area between the second flow path groups Bl and B1, the second flow path group having a long flow path length not including the fourth flow path E1 Compared with the case, the load acting on the micropump 122 can be reduced by / J.

 [0132] <Tenth embodiment>

 Next, a liquid cooling jacket according to a tenth embodiment will be described with reference to FIGS. 30 and 31. FIG. FIG. 30 is a plan view of a liquid cooling jacket according to the tenth embodiment. FIG. 31 is a graph showing the relationship between the number of turns and the thermal resistance.

 As shown in FIG. 30, the liquid cooling jacket J10 according to the tenth embodiment is similar to the liquid cooling jacket J9 according to the ninth embodiment. , Bl, B1 (second flow path group), and the second flow path groups Bl, B1 adjacent to each other in the flow direction of the cooling water pass through the fourth flow path E1 (connection flow path). Connected in series.

[0134] However, in the liquid cooling jacket J10, the adjacent second flow path groups Bl and B1 are arranged side by side, and among the adjacent second flow path groups B1, the downstream end of the upstream one and the downstream side The upstream end of the one is disposed on the same side, and the downstream end and the upstream end are connected in series via the fourth flow path E1. Specifically, as shown in FIG. 30, the second flow path group B1 at the upstream position and the middle The second flow path group Bl at the flow position is adjacent in the flow direction of the cooling water and is juxtaposed in the horizontal direction of FIG. For example, the downstream end of the second flow path group B1 at the upstream position and the upstream end of the second flow path group B1 at the midstream position face the lower side in FIG. 30, which is the same side.

 Here, in this specification, the state in which the adjacent second flow path groups Bl and Bl are arranged side by side is expressed as “folded” with respect to the ninth embodiment.

Therefore, according to such a liquid cooling jacket J10, the cooling water meanders and flows through the inside thereof. Then, the thermal resistance of the liquid cooling jacket J10 is less than the uncooled liquid cooling jacket I, J9 / J.

 [0136] To explain further, when the size of the liquid cooling jacket in a plan view is constant, the number of folds is increased without changing the number of second flow paths constituting each second flow path group B1, If the number of second flow path groups B1 is increased, the cross-sectional area of each second flow path constituting each second flow path group B1 is reduced. Therefore, when the flow rate of the cooling water flowing through the liquid cooling jacket is constant, the flow rate of the cooling water passing through each second flow path increases as the number of second flow path groups B1 increases. Therefore, heat is efficiently transferred from the liquid cooling jacket to the cooling water, and the thermal resistance of the liquid cooling jacket is reduced.

 [0137] Although an example of the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiments, and various embodiments may be appropriately combined without departing from the spirit of the present invention. Moyo! /, And can be modified as follows, for example.

 In each of the embodiments described above, the case where the heat generating body is the CPU 101 has been described, but the type of the heat generating body is not limited to this, and may be, for example, a power module, an LED lamp, or the like.

 In the first embodiment described above, the flat tube bundle 20 is configured by bundling a plurality of flat tubes 21 in the thickness direction, but may be configured by further bundling in the width direction.

[0140] The liquid cooling jacket J1 according to the first embodiment has been described with respect to the case where the flat tube bundle 20 is provided by bundling a plurality of flat tubes 21 (see Fig. 6). As shown in 32, instead of the flat tube bundle 20, a liquid cooling jacket J11 provided with a flat tube 28 having a plurality of hollow portions 28a partitioned by a plurality of partition walls may be used. In this case, each hollow The portion 28a functions as the second flow path B8a, and the flat tube 28 has a second flow path group B8 including a plurality of second flow paths B8a.

 [0141] In the liquid cooling jacket J1 according to the first embodiment described above, the positions of the force intake port 31a and the discharge port 31b described in the case where the intake port 31a and the discharge port 31b are formed in the lid body 31 are as follows. For example, it may be formed on the peripheral wall 12 of the jacket body 10. Along with this, the positions of the intake pipe 32 and the discharge pipe 33 are not limited to the upper surface side of the liquid cooling jacket J1, but may be positioned on the side surface side.

 [0142] In the liquid cooling jacket J6 according to the sixth embodiment described above, the fin 13 is erected on the jacket main body 10A and the fin 37 is erected on the lid main body 36 (see FIG. 26). (a) As shown in FIG. 33 (b), a first fin member 50 including a first base plate 51 and a plurality of first fins 52 erected on the first base plate 51, and a second The liquid cooling jacket J12 may include a base plate 56 and a second fin member 55 including a plurality of second fins 57 provided on the second base plate 56.

 [0143] The liquid cooling jacket J12 shown in Fig. 33 will be further described. The first fin member 50 and the second fin member 55 are configured such that the plurality of first fins 52 and the plurality of second fins 57 are intermingled. The whole of the plurality of metal fins in the liquid cooling jacket J12 is composed of a plurality of first fins 52 and a plurality of second fins 57. A second flow path B9a is formed between the two fins 57. The first fin member 50 is located on the CPU 101 side, and the first base plate 51 is fixed to the bottom wall 11 of the jacket body 10 so as to allow heat exchange.

 [0144] The liquid cooling jacket J12 has a second flow path group B9 including a plurality of second flow paths B9a. The protruding length L3 of the plurality of first fins 52 from the first base plate 51 is set to be the same as or shorter than the protruding length L4 of the plurality of second fins 57 from the second base plate 56. The plurality of second fins 57 and the first base plate 51 are joined and fixed so as to be capable of heat exchange by an appropriate means, and are thermally connected.

[0145] In the first embodiment described above, the first flow path Al and the third flow path C1 are formed by providing the spaces 10a and 10c between the jacket body 10 and the flat tube bundle 20, respectively ( (Refer to Fig. 5) Other than that, for example, the spaces 10a and 10c are not provided, but outside the jacket body 10 A branch pipe may be provided on the upstream side of this, the hollow part may be used as the first flow path, and the collecting pipe may be provided on the downstream side, and the hollow part may be used as the third flow path.

In the liquid cooling jacket J4 (see FIG. 14) according to the fourth embodiment described above, the fin member 25 is fixed to the jacket body 10. However, as shown in FIG. A liquid cooling jacket J13 in which the fin member 25 is fixed to the side surface of the jacket body 10 may be used. Further, as shown in FIG. 34, the CPU 101 may be attached to the lid body 31. Furthermore, a configuration may be adopted in which the intake pipe 32 serving as the cooling water intake port into the liquid cooling jacket J13, the discharge pipe 33 serving as the discharge port, and the force jacket body 10 are attached. In addition, the fin body is integrally formed on the side surface of the jacket body 10 of the lid body 31.

 Furthermore, as shown in FIG. 35, the jacket body 10 is provided with four legs 16 having through holes 16a, and screws 125 are passed through the through holes 16a. When attached to the housing 126 of the personal computer main body 120 (see FIG. 1), the removal position of the tool 200 is preferably a portion corresponding to the through hole 16a. Then, after pulling out the tool 200 at such a position, the trace of the tool 200 can be hidden by forming the through hole 16a in the trace part.

 34 is a cross-sectional view taken along line XI-XI in FIG.

 Example

 [0148] Hereinafter, the present invention will be described more specifically based on examples.

[0149] (1) Example 1, Examination of groove width W1 of second flow path B3a

 For the liquid cooling jacket J4 (see Fig. 13 etc.) according to the fourth embodiment, the groove width W1 (see Fig. 15) of the second flow path B3a is 0.2mm, 0.5mm, 1. Omm. Was made. Table 1 shows the specifications of the liquid cooling jacket J4.

 In Table 1, the overall channel width W0 is the width of the first channel A1 and the third channel C1. The overall flow path length L0 is the sum of the length of the first flow path A1, the length of the second flow path B3a, and the length of the third flow path C1 (see FIGS. 13 and 14).

[0150] [Table 1] Thermal conductivity of aluminum alloy (W / mk) 200

 Overall channel width WO (mm) 100

 Overall channel length L0 (mm) 100

 Second channel B3a groove width Wl (mm) 0, 2, 0. 5, 1. 0

 Second channel B3a depth Dl (mm) 10

[0151] Then, using water as cooling water, the micropump 122 (see Fig. 1) is operated so that this water flows at 5 (LZmin) (see Table 2), and the groove width of the second flow path B3a The relationship between W1 and the thermal resistance and pressure loss of liquid-cooled jacket J4 was examined. Thermal resistance and pressure loss were measured by appropriate methods. In the liquid cooling jacket J4 with this specification, the target thermal resistance was set to 0.008 (° CZW) or less.

[0152] [Table 2]

[0153] As shown in FIG. 36, as the groove width W1 of the second flow path B3a decreases, the contact area between the liquid cooling jacket J4 and the cooling water increases, so the thermal resistance of the liquid cooling jacket J4 decreases. Natsuta. On the other hand, it was confirmed that when the groove width W1 of the second flow path B3a is larger than 1.1 mm, the thermal resistance is larger than the target of 0.008 (° CZW).

 In addition, it was confirmed that the pressure loss that the cooling water receives by the liquid cooling jacket J4 is larger than 0.01 (° CZW) when the groove width W1 of the second flow path B3a is smaller than 0.2 mm.

 Therefore, it is considered that the groove width W1 of the second flow path B3a is preferably 0.2 to 1.1 mm.

 [0154] (2) Example 2, Investigation of the relationship between the thickness T1 of the fin 25b and the groove width W1 of the second flow path B3a

 Next, as in Example 1, the groove width W1 of the second flow path B3a is set to three types of 0.2 mm, 0.5 mm, and 1. Omm (see Table 1). Thickness of fin 25b against groove width Wl

By changing T1 appropriately, the relationship between “ratio of fin 25b thickness T1 and groove width W1 (T1ZW1)” and “thermal resistance” was examined.

[0155] As shown in FIG. 37, in each groove width W1, there was a range of “T1ZW1” in which the thermal resistance was small. This range was set to a value that was 5% or less of the minimum thermal resistance at each groove width W1. Specifically, when the groove width Wl of the second flow path B3a is 1. Omm, the minimum thermal resistance is 0.0073 (° C / W), so the value increased by 5% is 0.007 X 1. 05 = 0. 0076 (° C / W). Then, the range force becomes 0.5 ≦ T1 / W1 ≦ 1.4, which is less than or equal to 0.0076 (° CZW). Similarly, when the groove width W1 of the second flow path B3a is 0.5 mm, the range is 0.7≤T 1 / W1≤2.1. When the groove width Wl of the second flow path B3a is 0.2 mm, 0.8 ≦ T1 / Wl ≦ 2.9.

 Then, based on this, the graph shown in FIG. 38 was obtained by rewriting the X axis as “groove width Wl” and the Y axis as “fin thickness T1Z groove width Wl”. As shown in FIG. 38, it was confirmed that “groove width Wl” and “fin thickness T1Z groove width Wl” preferably satisfy the following formula (1).

 -0. 375 XW1 + 0. 875≤T1 / W1≤- 1. 875 XW1 + 3. 275 (1) [0157] (3) Third embodiment, groove width W1 of second flow path B3a Examination of relationship with depth D1

 Next, in the liquid cooling jacket J4 according to the fourth embodiment, the groove width W1 of the second flow path B3a is set to three types of 0.2 mm, 0.5 mm, and 1. Omm (see Table 1). The depth D1 was appropriately changed with respect to the groove width W1 of the two flow paths B3a, and the relationship between “depth Dl” and “thermal resistance” was examined.

 As shown in FIG. 39, as in Example 2, it was confirmed that each groove width W1 had a range of groove depth D1 in which the thermal resistance was reduced. Then, in the same manner as in Example 2, when this range is obtained, 2≤D1≤6 when the groove width W1 is 0.2 mm, 4≤D2≤11 when the groove width W1 is 0.5 mm, and the groove width Wl is 1. For Omm, 6≤D1≤18.

 [0159] Based on this, when the X-axis is rewritten as "groove width Wl" and the Y-axis is rewritten as "groove depth Dl", the graph shown in FIG. 40 is obtained. As shown in FIG. 40, it was confirmed that “groove width Wl” and “groove depth Dl” preferably satisfy the following formula (2):

 5 XW + 1≤D≤16. 25 XW + 2. 75 (2)

 [0160] (4) Example 4, examination of the effectiveness of the jig

Next, the effectiveness of applying the jig 210 to the peripheral wall 12 of the jacket body 10 in the friction stir welding between the jacket body 10 and the lid body 31 in the fourth embodiment was examined. In this study, two types of tools 200 shown in Table 3 were used. Then, as shown in Table 4, the outer peripheral surface of the shoulder 202 in the A tool or B tool, and the jacket The distance L6 from the outer peripheral surface of the peripheral wall 12 of the main body 10 was changed (see FIG. 19), and the peripheral wall 12 and the lid main body 31 were subjected to friction stir welding by changing the presence of the jig 210 and the absence of Z. The quality of the joint was evaluated visually. ○ indicates good, X indicates poor bonding.

 The rotation speed of the tool 200 was 6000 rpm, and the joining speed was 200 mmZmin. The thickness T11 of the peripheral wall 12 (see Fig. 19) was 4 mm.

[0161] [Table 3]

 [0162] [Table 4]

 [0163] As can be seen from Table 4, when the jig 210 is used, the lid body 31 can be satisfactorily bonded without deforming the peripheral wall 12 even when the distance L6 where the peripheral wall 12 is thin is 0.5 mm. confirmed.

 [0164] (5) Example 5, relationship between pin length L5 and lid body 31 thickness T2

 Next, the relationship between the length L5 of the pin 201 of the tool 200 and the thickness T2 of the lid body 31 was examined (see FIG. 19). In this examination, as shown in Table 5, the length L5 of the pin 201 was fixed to 2. Omm, the thickness T2 of the lid body 31 was changed, and the joint quality was visually evaluated.

[0165] [Table 5]

[0166] As shown in Table 5, the length L5 of the pin 201 is 6 of the thickness T2 of the lid body 31 that is the member to be joined. In the range of 0.0% or less, it was confirmed that the peripheral wall 12 and the lid body 31 can be joined well.

Claims

The scope of the claims

 [1] A liquid-cooled jacket in which a heat generating body is attached at a predetermined position, and heat generated by the heat generating body is supplied from an external heat transport fluid supply means and transmitted to a heat transport fluid flowing through the inside. Because

 A first flow path on the heat transport fluid supply means side;

 A second flow path group consisting of a plurality of second flow paths branched from the first flow path;

 A third flow path for collecting the plurality of second flow paths on the downstream side of the plurality of second flow paths, and

 The liquid cooling jacket, wherein the heat generating body mainly performs heat exchange in the second flow path group.

[2] A liquid-cooled jacket in which a heat generating body is mounted at a predetermined position and heat generated by the heat generating body is supplied from an external heat transport fluid supply means and transmitted to a heat transport fluid flowing through the inside. Because

 Toward the downstream side, the first flow path, a plurality of second flow path groups including a plurality of second flow paths, and a third flow path, the heat generating body being the second flow path group It is a liquid cooling jacket that mainly exchanges heat,

 The liquid cooling jacket, wherein the adjacent second flow path groups are connected in series via a connection flow path.

 [3] The adjacent second flow path groups are arranged side by side, and one downstream end thereof and the other upstream end thereof are on the same side. Liquid cooling jacket.

[4] A tube bundle formed by bundling a plurality of metal tubes,

 4. The liquid cooling jacket according to any one of claims 1 to 3, wherein a hollow portion of each tube is the second flow path.

[5] comprising a metal tube having a plurality of hollow portions,

 The liquid cooling jacket according to any one of claims 1 to 3, wherein each of the hollow portions is the second flow path.

[6] Provided with a plurality of metal fins arranged at predetermined intervals,

4. The liquid cooling jacket according to claim 1, wherein the second flow path is between adjacent fins.

[7] The liquid cooling jacket according to claim 6, wherein the width W of the second flow path is 0.2 to 1.1 mm.

 [8] The width W of the second flow path and the thickness T of the fin between the adjacent second flow paths satisfy the following expression (1): The liquid cooling jacket described in 1.

 -0. 375 XW + 0. 875≤T / W≤- 1. 875 XW + 3.275 (1)

[9] The liquid cooling jacket according to claim 6, wherein the depth D and the width W of the second flow path satisfy the following expression (2).

 5 XW + 1≤D≤16. 25 XW + 2. 75 (2)

[10] A fin member configured to include the plurality of metal fins and a base plate on which the plurality of metal fins are erected,

 A jacket body that houses the fin member;

 With

 7. The liquid cooling jacket according to claim 6, wherein the base plate is fixed to the jacket main body so as to allow heat exchange.

[11] a first fin member comprising a first base plate and a plurality of first fins erected on the first base plate;

 A second fin member comprising a second base plate and a plurality of second fins erected on the second base plate;

 With

 The first fin member and the second fin member are combined so that the plurality of first fins and the plurality of second fins are squeezed together,

 The plurality of metal fins includes the first fin and the second fin, and the second flow path is formed between the adjacent first fin and the second fin. The liquid cooling jacket according to claim 6, wherein:

[12] The heat generating body is attached to the first base plate side,

 The protruding length of the first fin is set to be the same as or shorter than the protruding length of the second fin,

The plurality of second fins and the first base plate are thermally connected to each other. The liquid cooling jacket according to claim 11.

[13] A jacket body having a fin housing chamber for housing the plurality of metal fins, a sealing body for sealing the fin housing chamber,

 With

 While the peripheral wall of the jacket body surrounding the fin housing chamber and the sealing member are joined by friction stir welding,

 7. The liquid cooling jacket according to claim 6, wherein a start end and an end of the friction stir welding overlap each other.

14. The liquid cooling jacket according to claim 13, wherein the plurality of metal fins are erected on the sealing body and are integral with the sealing body.

15. The liquid cooling jacket according to claim 13, wherein the friction stir welding is performed while applying a jig to the peripheral wall so that the peripheral wall does not deform outward.

[16] The length of the pin of the tool used in the friction stir welding is the thickness of the sealing body.

14. The liquid cooling jacket according to claim 13, wherein the liquid cooling jacket is 60% or less.

17. The liquid cooling jacket according to claim 13, wherein the tool extraction position is removed from the mating part in the friction stir welding.

[18] comprising a metal honeycomb body having a plurality of pores,

 The liquid cooling jacket according to any one of claims 1 to 3, wherein the pores are the second flow paths.

[19] A metal heat exchange sheet having a corrugated cross section, a metal jacket body to which the heat exchange sheet is fixed so that heat exchange is possible,

 With

 The liquid cooling according to any one of claims 1 to 3, wherein the second flow path is formed between the heat exchange sheet and the jacket body. Nacket.

 20. The liquid cooling jacket according to claim 6, wherein the metal is aluminum or an aluminum alloy.

[21] A heat transport fluid intake port that communicates with the first flow path, and a heat transport that communicates with the third flow path The liquid cooling jacket according to any one of claims 1 to 3, wherein the fluid discharge port is arranged symmetrically with the heat generating body as a center.

22. The liquid cooling jacket according to claim 21, wherein the intake port and the discharge port are disposed so as to relatively move away from each other.

23. The liquid cooling jacket according to claim 21, wherein the intake port and the discharge port are disposed so as to approach the heat generating body.

[24] The first aspect of the present invention is characterized in that the heat generating body is a CPU.

3. Liquid cooling jacket according to item 1 or!