JP6508398B2 - Liquid cooling jacket - Google Patents

Description

  The present invention relates to a liquid cooling jacket for cooling a heating element.

  2. Description of the Related Art In recent years, as the performance of electronic devices represented by personal computers is improved, the amount of heat generation of a mounted CPU (heating element) is increasing. In addition, in hybrid vehicles, electric vehicles, high-speed railway vehicles and the like, power semiconductors that generate a large amount of heat are used for switching of motors and the like. A reliable cooling device is required to stably operate electronic devices that generate a large amount of heat.

  In the past, air-cooling fan-type heat sinks have been used to cool heating elements, but problems such as fan noise and cooling limitations in air-cooling methods have come to be close up, and water-cooling as a next-generation cooling method A water-cooled plate (liquid-cooled jacket) of the type has attracted attention.

  For example, Patent Document 1 discloses a liquid cooling jacket having a fin main body provided with a plurality of flow paths through which a heat transport fluid such as water flows and a housing for containing the fin main body. This fin main body is formed by pressing a plurality of pillar-like pins between adjacent fins after forming an extruded shaped material composed of a substrate and a plurality of fins rising from the substrate.

Japanese Patent Publication No. 2010-134191

  In the conventional method of manufacturing a liquid cooling jacket, there is a problem that it takes time and effort to push in a plurality of pins, and it becomes difficult to press the pins accurately. In addition, since the fins are plastically deformed, the fins may be broken depending on the pressing depth of the pins. Furthermore, in the conventional liquid cooling jacket, although a partial turbulence is generated in the heat transport fluid due to the pins, there is a problem that the heat transport fluid basically flows in a straight line and the cooling efficiency is low.

  Then, this invention makes it a subject to provide the liquid cooling jacket with high cooling efficiency.

  In order to solve the above-mentioned subject, the present invention is a liquid cooling jacket which has a fin main part provided with a channel of a plurality of zigzags, and a case to which the fin main body is fixed, and the case is a peripheral wall , A base plate covering one side of the peripheral wall, a cover plate covering the other side of the peripheral wall, an opening through which the heat transport fluid flows from the outside, and an opening through which the heat transport fluid flows out And the fin body has a plurality of zigzag fins, and a plurality of first fins standing up from the base plate and a plurality of second fins depending from the lid plate are alternately arranged in the front-rear direction. The first fin and the second fin are columnar bodies having a parallelogram in plan view, and have the same shape, and the left-right direction of the first fin and the second fin When the axial length is T, Forming a stepped portion at the butt between the first fin and the second fin by butting so that the contact margin between the side end face of the second fin and the side end face of the second fin is T / 2 or more and less than T; It is characterized by

In such a manufacturing method, since the flow path of the fin main body is zigzag, the contact area between the heat transport fluid and the fin can be increased to improve the cooling efficiency.
When the side end faces of the first fin and the second fin are brought into close surface contact (where the contact margin is T), the cooling efficiency is improved compared to the conventional case, but turbulent flow is less likely to occur. On the other hand, when the contact margin is less than T / 2, the step resistance between the first fin and the second fin is increased, the flow resistance is increased, and the flow of the heat transport fluid is deteriorated. However, according to such a manufacturing method, since the step portion is formed, turbulent flow occurs, and the cooling efficiency can be further enhanced, and the flow resistance of the heat transport fluid can be reduced.

  According to the liquid cooling jacket according to the present invention, the cooling efficiency is enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the liquid-cooling jacket which concerns on embodiment of this invention, Comprising: (a) is a perspective view, (b) is II sectional drawing of (a). It is an exploded perspective view of a liquid cooling jacket concerning this embodiment. It is a perspective view of a frame member concerning this embodiment. (A) is a schematic plan view showing the fin main body according to the present embodiment, (b) is an enlarged plan view of the zigzag fin according to the present embodiment, and (c) is an enlarged plan view of the zigzag fin according to the modification FIG. It is a figure showing the manufacturing method of the liquid cooling jacket concerning the embodiment of the present invention, and (a) is a perspective view showing the 1st section material and the 2nd section material, (b) is a sectional view of (a) It is. It is a figure which shows the manufacturing method of the liquid cooling jacket which concerns on this embodiment, Comprising: (a) is a perspective view which shows a 1st cutting process and a 2nd cutting process, (b) is a 1st cutting process and a 2nd cutting It is a top view which shows the back of a process. It is a perspective view which shows the 1st shape material arrangement | positioning process which concerns on this embodiment. It is a perspective view which shows the 2nd material arrangement | positioning process which concerns on this embodiment. It is a perspective view which shows the 2nd material arrangement | positioning process back which concerns on this embodiment. It is a perspective view which shows the frame member arrangement | positioning process which concerns on this embodiment. (A) is a model top view of the inside of the liquid cooling jacket which concerns on this embodiment, (b) is an enlarged view around a partition part. It is a disassembled perspective view which shows the liquid cooling jacket which concerns on a 1st modification.

  A method of manufacturing a liquid cooling jacket and a liquid cooling jacket according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown to (a) of FIG. 1, the liquid cooling jacket 1 is a member which cools the heat generating body (illustration omitted) fixed to the upper surface or lower surface. Inside the liquid cooling jacket 1, for example, a flow path through which a heat transport fluid such as water flows is formed. In the following description, “upper and lower”, “right and left”, and “front and rear” follow the arrows in FIG. 1. These directions are specified for the convenience of description and do not limit the structure of the liquid cooling jacket 1.

  As shown in (a) and (b) of FIG. 1, the liquid cooling jacket 1 is configured of a housing 2 and a fin main body 3 disposed inside the housing 2. The housing 2 is a hollow member that constitutes the outside of the liquid cooling jacket 1. The housing 2 is configured by a base plate 11, a frame member (peripheral wall portion) 21, and a cover plate 31 in the present embodiment. The base plate 11, the frame member 21 and the lid plate 31 are preferably formed of a metal having high thermal conductivity, and in the present embodiment, all of them are formed of aluminum or an aluminum alloy. The members constituting the liquid cooling jacket 1 may be joined in any manner, but in the present embodiment, they are integrated by brazing.

  The base plate 11 is a plate-like member that constitutes the lower side of the housing 2. As shown in FIG. 2, the base plate 11 is formed with a recess 12 and positioning holes 13 and 13 which are rectangular in plan view. The concave portion 12 is a portion where the first substrate 42 of the first fin portion 41 described later is disposed. The depth of the recess 12 may be set as appropriate, but in the present embodiment, it is approximately equal to the thickness of the first substrate 42. The recess 12 can be formed by pressing or cutting. The first fin portion 41 may be disposed on the base plate 11 without providing the recess 12. The positioning hole 13 is a hole for positioning the base plate 11, the frame member 21, and the lid plate 31.

  The frame member 21 is a member disposed on the upper surface 11 a of the base plate 11. As shown in FIG. 2, the frame member 21 has a substantially rectangular frame shape in plan view. The fin main body 3 is disposed inside the frame member 21. The frame member 21 is formed with a fixed height dimension. As shown in (b) of FIG. 1, the height dimension of the frame member 21 may be set appropriately, but in the present embodiment, the height dimension of the first fin 43 of the first fin portion 41 and the second fin portion It is substantially equal to the sum of the thickness 51 of the second substrate 52 and the thickness of the second substrate 52.

  As shown in FIG. 3, the frame member 21 has frame portions 22 and 22, a front overhanging portion 23, a rear overhanging portion 24, partition walls 26 and 26, and side overhanging portions 29 and 29. . The frame member 21 is a member corresponding to the “peripheral wall portion” in the claims. The front overhanging portion 23 is a portion that is continuous with the frame portion 22 and overhangs to the front side. The front overhanging portion 23 is used as a portion where a screw hole or the like for attaching a heating element (not shown) or other parts is formed. Further, positioning holes 27 are formed in the front overhanging portion 23. A through hole 25 is formed by being surrounded by the front overhanging portion 23 and the partition portion 26. The through hole 25 penetrates in the vertical direction, and the heat transport fluid flows.

  The partition portion 26 is a wall that separates the space portion of the through hole 25 from the inside of the frame member 21. Both ends of the partition portion 26 are connected to the front overhang portion 23. Moreover, the partition part 26 is formed in planar view circular arc shape so that it may become convex back. A plurality of communication grooves 28 communicating with the through holes 25 and the inside of the frame member 21 are formed in the upper portion of the partition wall 26. The communication groove 28 is a groove through which the heat transport fluid flows, and is a portion that regulates the flow and flow rate of the heat transport fluid. Although six communicating grooves 28 are formed in the present embodiment, the number of communicating grooves 28 is not limited. The number and the position, the shape, and the like of the communication grooves 28 can be appropriately changed to adjust the flow and the flow rate of the heat transport fluid.

  The side overhanging portions 29 are portions that project rearward from the left and right sides on the rear side of the frame portion 22. The side overhanging portion 29 is used as a portion where a screw hole or the like for attaching a heating element (not shown) or other parts is formed.

  The rear overhang portion 24 is formed to be point-symmetrical to the front overhang portion 23. The configuration of the rear overhanging portion 24 is the same as that of the front overhanging portion 23, and therefore, the same reference numerals as those of the front overhanging portion 23 are given and the description thereof is omitted. Further, similarly to the front side, the partition portion 26 is connected to the rear overhang portion 24 as well.

  The cover plate 31 is a plate-like member which covers the frame member 21 as shown in FIG. The cover plate 31 is formed in a planar shape substantially equal to the outer edge of the frame member 21. At the front center of the cover plate 31, a front overhanging portion 33 projecting forward is formed. At the center on the rear side of the cover plate 31 is formed a rear overhang portion 34 that protrudes rearward.

  An opening 35 is formed at the center of the front overhanging portion 33 and the rear overhanging portion 34, respectively. The openings 35, 35 are portions where one is an inlet for the heat transport fluid and the other is an outlet. Positioning holes 36 are respectively formed on the side of the opening 35. The positioning holes 13 of the base plate 11, the positioning holes 27 of the frame member 21, and the positioning holes 36 of the cover plate 31 are formed to communicate with each other. On the left and right sides on the rear side of the lid plate 31, side overhanging portions 37, 37 that project rearward are formed. The side overhanging portion 37 has the same shape as the side overhanging portion 29 of the frame member.

  The fin main body 3 is a site | part which has a several flow path through which a heat transport fluid distribute | circulates, as shown in FIG. The fin main body 3 is configured of a first fin portion 41 and a second fin portion 51. The first fin portion 41 and the second fin portion 51 are preferably formed of a metal having high thermal conductivity, and in the present embodiment, both are formed of aluminum or an aluminum alloy. The first fin portion 41 is composed of a first substrate 42 and a plurality of first fins 43 rising from the first substrate 42. The first fins 43 are columnar bodies having a parallelogram in plan view, and all have the same shape.

  The second fin portion 51 is composed of a second substrate 52 and a plurality of second fins 53 depending from the second substrate 52. The second fins 53 are pillars exhibiting a parallelogram in plan view, and all have the same shape. Further, the first fin 43 and the second fin 53 have the same shape. That is, the plate thickness dimension T, height dimension, and length dimension of the first fin 43 and the second fin 53 are the same. Further, the orientation angles of the first fins 43 with respect to the first substrate 42 are all the same. Further, the orientation angles of the second fins 53 with respect to the second substrate 52 are all the same.

  As shown in (a) of FIG. 4, the fin body 3 has a plurality of zigzag fins P. The zigzag fins P are configured by alternately arranging first fins 43 and second fins 53 in the front-rear direction. As shown also in (b) of FIG. 1, a space surrounded by the first substrate 42, the second substrate 52, and the adjacent zigzag fins P and P is a flow passage Q through which the heat transport fluid flows. The flow paths Q are arranged in parallel at regular intervals in the left-right direction.

  (B) of FIG. 4 is an enlarged plan view of the zigzag fin according to the present embodiment, and (c) is an enlarged plan view of the zigzag fin according to the modification. As shown to (b) of FIG. 4, in this embodiment, the side end surface 43b of the 1st fin 43 and the side end surface 53b of the 2nd fin 53 which adjoin in the front-back direction are in surface contact. In the present embodiment, the contact margin of the first fin 43 and the second fin 53 is butted so as to be equal to the thickness T of the first fin 43 and the second fin 53. That is, the side end surface 43b of the first fin 43 and the side end surface 53b of the second fin 53 adjacent to each other in the front-rear direction are abutted so as to exactly overlap each other. The plate thickness dimension T is a length on the left-right direction axis of the first fin 43 and the second fin 53.

  On the other hand, as shown in (c) of FIG. 4, the first fins 43 and the second fins 53 may be shifted in the left-right direction to be butted. In this case, the side end surface 43b of the first fin 43 and the side end surface 53b of the second fin 53 are opposed so that each contact margin of the first fin 43 and the second fin 53 is T / 2 or more and less than T. Make surface contact. As a result, a stepped portion R is formed at the abutment portion between the first fin 43 and the second fin 53. When the heat medium flow channel flows, the heat transport fluid collides with the stepped portion R to generate turbulent flow.

  Next, a method of manufacturing the liquid cooling jacket according to the present embodiment will be described. The method for manufacturing a liquid-cooled jacket according to the present embodiment includes a first preparation step, a second preparation step, a first cutting step, a second cutting step, a brazing material layer forming step, and a first fin portion arranging step. And a second fin portion arranging step, a frame member arranging step, a cover plate arranging step, and a brazing step.

  The first preparation step is a step of preparing a first shape member 61A as shown in (a) and (b) of FIG. Moreover, a 2nd preparatory process is a process of preparing the 2nd shape material 61B. The first section 61A and the second section 61B are the same members in the present embodiment.

  The first shape member 61A has a plate-like first substrate 62A and a plurality of first convex portions 63A rising from the first substrate 62A. The first substrate 62A is shaped to be disposed in the recess 12 (see FIG. 2) without a gap. The first substrate 62A is the same member as the first substrate 42 shown in FIG. The four corners of the first substrate 62A are chamfered. The first ridges 63A extend in the left-right direction and are arranged parallel to one another. The number of the first ridges 63A may be set as appropriate, but in the present embodiment, the number is set to five.

  The height dimension and the front-rear length dimension of each first ridge portion 63A are the same. A recessed groove 64A is formed between the adjacent first ridges 63A, 63A and on the rear side of the rearmost first ridges 63A. The longitudinal dimension (the distance between the first ridges 63A, 63A) of the recessed groove 64A is the same as the longitudinal dimension of the first ridge 63A. The molding method of the first shape member 61A is not particularly limited, but in the present embodiment, it is formed by extrusion molding.

  As illustrated in (a) and (b) of FIG. 5, the second shape member 61B includes a second substrate 62B and a plurality of second convex streaks 63B rising from the second substrate 62B. Since the first shape member 61A and the second shape member 61B are members having the same shape, "B" is added to the end of the reference numerals to distinguish them, and detailed description will be omitted.

  The first cutting process is a process of forming the plurality of first fins 43 by cutting the first shape member 61A with the multi-cutter M, as shown in (a) and (b) of FIG. The multi-cutter M is a tool for cutting a metal member. The multi-cutter M is composed of a shaft portion M1 and a disk cutter M2 provided in parallel with the shaft portion M1 with a gap. A cutting blade (not shown) is formed on the outer peripheral edge of the disk cutter M2. The plate thickness of the disk cutter M2 is the same as the gap (dimension in the direction orthogonal to the flow path direction) between the adjacent zigzag fins P, P as shown in FIG. 4B. The gap between the adjacent disk cutters M2 and M2 is the same as the thickness of the zigzag fin P (the dimension in the direction orthogonal to the flow direction).

  In the first cutting step, as shown in (a) and (b) of FIG. 6, the rotation center axis C of the multi-cutter M is at an angle α with respect to the horizontal axis (the extending direction of the first ridge 63A). It inclines and cuts the 1st convex streak part 63A diagonally. The cutting depth may be set as appropriate, but in the present embodiment, it is set to be the same as the height dimension of the first ridge portion 63A. The angle α may be set appropriately, for example, 0 ° <α <60 °, more preferably 5 ° <α <45 °. In the first cutting process, the multi-cutter M is relatively moved four times to cut the entire first ridge portion 63A. As shown to (b) of FIG. 6, the 1st fin group comprised by the several 1st fin 43 of the same shape by the 1st cutting process is formed in multiple rows (five rows in this embodiment). The first fin groups and the concave grooves 64A are alternately formed in the front-rear direction.

  After the first fin 43 is formed, a brazing material is applied to the tip end surface 43 a of the first fin 43 to form a brazing material layer. In addition, before cutting the first ridge portion 63A with the multi-cutter M, a brazing material may be applied in advance to the tip end surface of the first ridge portion 63A.

  The second cutting step is the same as the first cutting step. As shown to (b) of FIG. 6, the 2nd fin group comprised by the several 2nd fin 53 of the same shape by the 2nd cutting process is formed in multiple rows (five rows in this embodiment). The respective second fin groups and the respective recessed grooves 64B are alternately formed in the front-rear direction. After the second fins 53 are formed, a brazing material is applied to the tip end surface 53a of the second fins 53 to form a brazing material layer. Note that, before cutting the second ridge portion 63B with the multi-cutter M, a brazing material may be applied in advance to the tip surface of the second ridge portion 63B.

  Although the angle α ° may be changed in the first cutting process and the second cutting process, the manufacturing cost can be reduced by setting the angle α in the same manner as in the present embodiment.

  The first fin portion arranging step (arranging step) is a step of arranging the first fin portion 41 on the base plate 11. As shown in FIG. 7, in the first fin portion arranging step, the first fin portion 41 is arranged in the concave portion 12 of the base plate 11. A brazing material is applied in advance to the upper surface 11 a of the base plate 11 and the bottom of the recess 12 to form a brazing material layer. The top surface 11 a of the base plate 11 and the top surface 42 a of the first substrate 42 become flush with each other by the first fin portion arranging step.

  The second fin portion arranging step (arranging step) is a step of overlapping so that the first fin portion 41 and the second fin portion 51 face each other. The second fin portion arranging step corresponds to the “inserting step” in the claims. As shown in FIG. 8, the respective second fin groups composed of the plurality of second fins 53 of the second fin portion 51 are inserted into the respective recessed grooves 64 </ b> A of the first fin portion 41. Further, each first fin group constituted by the plurality of first fins 43 of the first fin portion 41 is inserted into each of the concave grooves 64 B of the second fin portion 51. In other words, in the second fin portion arranging step, while the first fin portion 41 and the second fin portion 51 are opposed to each other, the first substrate 42 and the second substrate 52 are disposed so as to exactly overlap in the vertical direction. . Thereby, the upper surface 42 a of the first substrate 42 and the tip end surface 53 a of the second fin 53 are in contact with each other, and the upper surface 52 a of the second substrate 52 and the tip end surface 43 a of the first fin 43 are in contact with each other. FIG. 9 is a perspective view showing after the second fin portion arranging step.

  The frame member disposing step is a step of disposing the frame member 21 on the upper surface 11 a of the base plate 11 as shown in FIG. Thus, the front partition wall portion 26 is disposed to face the inlet side of the fin main body 3 (flow path Q). Positioning pins (not shown) are inserted and positioned while communicating the positioning holes 27, 27 of the frame member 21 with the positioning holes 13, 13 of the base plate 11. The first fin portion 41 and the second fin portion 51 are disposed on the inner side (hollow portion) of the frame member 21. The upper surface 21 a of the frame member 21 and the lower surface (exposed surface) 52 b of the second substrate 52 are flush with each other.

  The lid plate arranging step is a step of covering the frame member 21 with the lid plate 31 as shown in FIG. Positioning holes 36, 36 of the lid plate 31 are inserted into positioning pins (not shown) for positioning. On the lower surface of the cover plate 31, a brazing material is applied in advance to form a brazing material layer.

  The brazing step (fixing step) is a step of heating each member to melt and solder the brazing material layer. Each member is fixed by the brazing process, and the liquid cooling jacket 1 is completed.

  According to the liquid cooling jacket manufacturing method described above, the first fin group of the first fin portion 41 and the second fin group of the second fin portion 51 formed by cutting with the multi-cutter M are opposed to each other, and It inserts so that one fin group and the 2nd fin group may be arranged by turns. Thereby, fin main part 3 which has a plurality of zigzag fins P can be formed easily. Moreover, since the flow path Q of the fin main body 3 becomes zigzag, the contact area of a heat transport fluid and the zigzag fin P can increase, and it can improve cooling efficiency. Moreover, since the clearance dimension S (refer FIG. 4, (b), (c)) of the flow path Q is formed uniformly, the cooling temperature of the upper surface of the liquid cooling jacket 1 and a lower surface can be made uniform.

  Further, as in the present embodiment, the contact margin between the side end surface 43b of the first fin 43 and the side end surface 53b of the second fin 53 is T (T is on the left-right direction axis of the first fin 43 and the second fin 53). They may be butted so that the length of the contact is equal to or less than T / 2. As a result, the stepped portion R (see (c) in FIG. 4) is formed, so that the heat transport fluid collides with the stepped portion R to generate turbulent flow. Thereby, the cooling efficiency can be further enhanced. When the contact margin is less than T / 2, the flow resistance is increased and the turbulent flow is increased too much, so that the flow of the heat transport fluid is deteriorated.

  Moreover, since the 1st fin part 41 and the 2nd fin part 51 which comprise the fin main body 3 are the same shapes like this embodiment, the formation process of these members becomes easy. In addition, by forming a brazing material layer on the tip surfaces 43a and 53a of the first fin 43 and the second fin 53 and brazing them, the fin main body 3 can be easily manufactured.

  Also, the housing 2 for housing the fin main body 3 may have any structure as long as it can accommodate the fin main body 3, but as in the present embodiment, the base plate 11, the frame member 21 and the lid plate 31 And can be easily manufactured by integrating them by brazing. Further, in the present embodiment, since the first fin portion 41 and the second fin portion 51 can be simultaneously brazed in addition to the brazing of the housing 2 and the fin main body 3, the manufacturing cycle can be shortened. Can. Further, the water tightness of the liquid cooling jacket 1 can be enhanced by brazing.

  (A) of FIG. 11 is a schematic plan view of the inside of the liquid-cooled jacket according to the present embodiment, and (b) is an enlarged view around the partition. In FIG. 11, dots are attached to the zigzag fins P. As shown in (a) and (b) of FIG. 11, in the liquid cooling jacket 1, the heat transport fluid flows in from the opening 35 on the front side, and the through hole 25 on the front side, the communication groove 28, the zigzag flow path Q, The fluid flows in the order of the rear communication groove 28 and the through hole 25 and flows out from the opening 35.

  The partition portion 26 may be provided appropriately as needed. However, when the partition 26 is not provided, there is a problem that the strength around the opening 35 becomes low. The front overhanging portions 23 and 33 and the rear overhanging portions 24 and 34 of the frame member 21 and the lid plate 31 are portions where fastening means such as screws for attaching a heating element (not shown) or other parts are fastened. Because there is a need for strength to withstand the fastening force. In addition, when the partition 26 is not provided, the heat transport fluid flowing from the opening 35 flows in a large amount in the central flow path Q of the liquid cooling jacket 1 and the heat transport fluid does not easily flow in the flow paths Q on both ends. As a result, there is a problem that the cooling temperatures of the upper and lower surfaces of the liquid cooling jacket 1 become uneven.

  However, according to the present embodiment, by providing the partition 26, the strength around the portion where the fastening means is inserted can be enhanced. Further, by providing the partition 26 and providing the communication grooves 28 on the left and right ends of the partition 26, the heat transport fluid is more likely to flow through the channels Q on both ends than the central channel Q. That is, since the flow and flow rate of the heat transport fluid can be adjusted by providing the partition 26 and the communication groove 28, the cooling temperature of the upper surface and the lower surface of the liquid cooling jacket 1 can be made uniform. The partition portion 26 may be formed in a linear shape, but by forming an arc shape so as to be convex to the inside of the frame member 21, the heat transport fluid flows radially, and the flow path Q at both ends is thermally Transport fluid is more easily spreadable.

First Modification
FIG. 12 is an exploded perspective view showing a first modified example. The liquid-cooled jacket 1A according to the first modification is composed of a base plate 11, three fin bodies 3, a frame member 21A, and a lid plate 31. The liquid cooling jacket 1A is different from the embodiment described above in that a plurality of fin bodies 3 are stacked. In the first modification, the same parts as those in the above-described embodiment will be denoted by the same reference numerals, and the description will be omitted.

  As shown in FIG. 12, three fin bodies 3 are stacked on the base plate 11. The fin main body 3 is respectively comprised by the 1st fin part 41 and the 2nd fin part 51 like embodiment mentioned above. Inside the fin main body 3, a plurality of zigzag fins P are formed, and a plurality of flow paths Q are formed. In the first modification, the respective flow paths Q of the lower, middle and upper fin main bodies 3 are disposed at the positions which exactly overlap in the vertical direction. Interposed sheets 71, 71 are disposed between the fin main bodies 3, 3, respectively. The interposing sheet 71 includes, for example, a base layer and a pair of brazing material layers formed on the front and back surfaces of the base layer.

  The height dimension of the frame member 21A is larger than that of the frame member 21 of the embodiment described above. When the frame member 21A is disposed on the base plate 11, the upper surface 21a of the frame member 21A and the lower surface (exposed surface) 52b of the second fin portion 51 of the uppermost fin main body 3 become flush.

  When manufacturing the liquid cooling jacket 1A, the three fin main bodies 3 are laminated on the base plate 11, and the interposition sheet 71 is disposed between the fin main bodies 3 and 3. Further, the frame member 21A is disposed on the base plate 11, and the frame member 21A is covered with the lid plate 31.

  The brazing step (fixing step) is a step of heating each member to melt and solder the brazing material layer. Each member is fixed by the brazing process, and the liquid cooling jacket 1A is completed.

  As in the first modification, a plurality of fin bodies 3 may be stacked. Although the first modification has a three-layer structure, two layers may be used, or four or more layers may be stacked. By laminating a plurality of fin bodies 3, the number of zigzag fins P and flow paths Q can be increased, and the cooling efficiency can be further enhanced.

  Further, in the manufacturing method according to the first modification, the base sheet 11, the frame member 21A and the lid plate 31 are brazed in the brazing step by providing the interposing sheet 71 between the fin main bodies 3 and 3. At the same time, the fin bodies 3 and 3 can be easily fixed to each other.

  Although the embodiment and the first modification of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. Although the housing | casing 2 of this embodiment was comprised by three members, the base board 11, the frame member 21, and the cover board 31, you may comprise with a box-shaped body and a cover board, for example. Moreover, although the housing | casing 2 and the fin main body 3 were integrated by brazing in this embodiment, you may join both in another form.

  In the present embodiment, the brazing material layer is formed on the base plate 11, the end surface 43a of the first fin 43, the end surface 53a of the second fin 53, and the lower surface 31b of the lid plate 31. 21, a brazing material layer may be formed on at least one of the portions where the fin main body 3 and the lid plate 31 are butted. Alternatively, a clad material composed of a brazing material layer and a metal layer may be used.

  Further, in the present embodiment, the heat transport fluid flows in from the one opening 35 and the heat transport fluid flows out from the other opening 35, but the invention is not limited to this. For example, the frame member (peripheral wall portion) 21 may be provided with a pair of openings. Also, for example, instead of the housing 2, a pair of header pipes may be provided which are connected to the inlet side and the outlet side of the fin main body 3 (flow path Q).

  Moreover, in this embodiment, although the partition part 26 was provided in the both sides of the front side of the frame member 21, and the rear side, it is good only at least only in the front side.

  In addition, as shown in (a) and (b) of FIG. 5, after the first shape member 61A and the second shape member 61B are formed by the first preparation step and the second preparation step, the first preliminary cutting step and the Two preliminary cutting steps may be performed.

  Even when the first profile 61A and the second profile 61B are formed by extrusion molding, minute non-uniformity may occur in the first profile 61A and the second profile 61B. Therefore, in the first preliminary cutting process, the cutting process (fine correction process) is performed using the multi-cutter M in order to correct the shapes of the first ridges 63A and the recessed grooves 64A. In the first preliminary cutting step, the rotation center axis C of the multi-cutter M is disposed parallel to the longitudinal axis, and the multi-cutter M is relatively moved in the left-right direction. The thickness dimension of the disk cutter M2 of the multi-cutter M and the gap between the adjacent disk cutters M2 may be set appropriately. Thereby, the first ridge portion 63A and the concave groove 64A without lands can be formed. The second preliminary cutting step is also performed in the same manner as the first preliminary cutting step.

Reference Signs List 1 liquid-cooled jacket 2 housing 3 fin main body 11 base plate 21 frame member (peripheral wall portion)
25 through hole 26 partition wall 28 communication groove 31 cover plate 41 first fin portion 42 first substrate 43 first fin 43a end surface 43b end surface 51 second fin portion 52 second substrate 53 second fin 53a end surface 53b end surface M Multi-cutter M1 Shaft M2 Disc Cutter P Zigzag Fin Q Channel T Plate Thickness R R Step

Claims (1)

A liquid cooling jacket having a fin body provided with a plurality of zigzag flow paths, and a case to which the fin body is fixed,
The casing includes a peripheral wall portion, a base plate covering one side of the peripheral wall portion, a cover plate covering the other side of the peripheral wall portion, an opening portion through which a heat transport fluid flows from the outside, and the heat transport fluid And an opening that flows out,
The fin main body has a plurality of zigzag fins, and a plurality of first fins rising from the base plate and a plurality of second fins depending from the lid plate are alternately arranged in the front-rear direction. Yes,
The first fin and the second fin are columnar bodies exhibiting a parallelogram in plan view, and have the same shape,
Let T be the length on the lateral axis of the first fin and the second fin,
Abutment is made so that the contact margin between the side end face of the first fin and the side end face of the second fin is T / 2 or more and less than T, and a step portion is formed in the butting portion of the first fin Liquid-cooled jacket characterized by forming a.

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