JP6698111B2 - 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 electronic devices typified by personal computers have improved in performance, the amount of heat generated by a CPU (heating element) mounted therein has increased. Further, 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 motors and the like. A highly reliable cooling device is required for stable operation of electronic devices that generate a large amount of heat.

  Conventionally, an air-cooled fan type heat sink has been used to cool the heating element, but problems such as fan noise and the cooling limit of the air-cooled type have come to the forefront, and as the next-generation cooling method, water cooling is used. The water cooling plate (liquid cooling jacket) of the method is drawing attention.

  For example, Patent Document 1 discloses a liquid cooling jacket including a fin main body having a plurality of flow paths through which a heat-transporting fluid such as water flows, and a housing that houses the fin main body. This fin body is formed by forming an extruded shape member including a substrate and a plurality of fins rising from the substrate, and then pressing a plurality of columnar pins between adjacent fins.

Japanese Patent Publication No. 2010-134191

  In the conventional liquid cooling jacket, although a turbulent flow is partially generated in the heat transport fluid by the pins, there is a problem that the cooling efficiency is low because the heat transport fluid flows linearly.

  Therefore, an object of the present invention is to provide a liquid cooling jacket with high cooling efficiency.

In order to solve the above problems, the present invention is a liquid cooling jacket having a fin body having a plurality of zigzag single-layer flow passages, and a housing to which the fin body is fixed. Is a peripheral wall portion, a base plate that covers one side of the peripheral wall portion, a lid plate that covers the other side of the peripheral wall portion, an opening through which the heat transport fluid flows in from the outside, and the heat transport fluid flows out to the outside. And a partition wall portion having both ends connected to the peripheral wall portion and facing the inlet of the fin body, and the partition wall portion being surrounded by the peripheral wall portion and the partition wall portion. A communication groove for guiding the heat-transporting fluid that has flowed into the space to the inside of the peripheral wall portion is formed, and a plurality of fin bodies are laminated and fixed to each other via a brazing material layer .

According to this structure, since the flow path of the fin body is zigzag, the contact area between the heat transport fluid and the fin is increased, and the cooling efficiency can be improved. Further, by forming the communication groove in the partition wall portion, the flow and flow rate of the heat transport fluid can be adjusted. Further, by providing the partition wall portion, the strength around the portion where the fastening means is inserted can be increased. Further, since the fins and the flow paths can be increased, the cooling efficiency can be further improved.

  According to the liquid cooling jacket of the present invention, cooling efficiency can be increased.

It is a figure which shows the liquid cooling jacket which concerns on embodiment of this invention, (a) is a perspective view, (b) is an II sectional view of (a). It is a disassembled perspective view of the liquid cooling jacket which concerns on this embodiment. It is a perspective view of the frame member concerning this embodiment. (A) is a schematic plan view showing a fin body according to the present embodiment, (b) is an enlarged plan view of a zigzag fin according to the present embodiment, and (c) is an enlarged plan view of a zigzag fin according to a modified example. It is a figure. It is a figure which shows the manufacturing method of the liquid cooling jacket which concerns on embodiment of this invention, (a) is a perspective view which shows a 1st profile and a 2nd profile, (b) is sectional drawing of (a). Is. It is a figure which shows the manufacturing method of the liquid cooling jacket which concerns on this embodiment, (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 process after. It is a perspective view which shows the 1st profile arrangement|positioning process which concerns on this embodiment. It is a perspective view which shows the 2nd structural member arrangement process which concerns on this embodiment. It is a perspective view showing after the 2nd profile placement process concerning this embodiment. It is a perspective view showing a frame member arrangement process concerning this embodiment. (A) is a schematic plan view of the inside of the liquid cooling jacket according to the present embodiment, and (b) is an enlarged view around the partition wall portion. It is a disassembled perspective view which shows the liquid cooling jacket which concerns on a 1st modification.

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

  As shown in FIGS. 1A and 1B, the liquid cooling jacket 1 is composed of a housing 2 and a fin body 3 arranged inside the housing 2. The housing 2 is a hollow member that constitutes the outside of the liquid cooling jacket 1. In this embodiment, the housing 2 includes a base plate 11, a frame member (peripheral wall portion) 21, and a lid plate 31. The base plate 11, the frame member 21, and the cover plate 31 are preferably made of a metal having a high thermal conductivity, and in the present embodiment, they are all made of aluminum or an aluminum alloy. Each member forming the liquid cooling jacket 1 may be joined by any method, but in the present embodiment, they are integrated by brazing.

  The base plate 11 is a plate-shaped member that constitutes the lower side of the housing 2. As shown in FIG. 2, the base plate 11 is provided with a recess 12 and positioning holes 13 and 13 each having a rectangular shape in plan view. The concave portion 12 is a portion where the first substrate 42 of the first fin portion 41, which will be described later, is arranged. The depth of the recess 12 may be set appropriately, but in the present embodiment, it is approximately equal to the plate thickness of the first substrate 42. The recess 12 can be formed by pressing or cutting. The first fin portion 41 may be arranged 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 arranged 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 a plan view. The fin body 3 is arranged inside the frame member 21. The frame member 21 is formed with a constant height dimension. As shown in FIG. 1B, the height dimension of the frame member 21 may be set appropriately, but in the present embodiment, the height dimension of the first fins 43 of the first fin portion 41 and the second fin portion. It is approximately equal to the sum of the thickness dimension of the second substrate 52 of 51.

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

  The partition wall 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 wall portion 26 are connected to the front overhang portion 23. Further, the partition wall portion 26 is formed in an arc shape in a plan view so as to be convex rearward. A plurality of communication grooves 28 that communicate with the through holes 25 and the inside of the frame member 21 are formed in the upper portion of the partition wall portion 26. The communication groove 28 is a groove through which the heat transport fluid flows, and is a part that regulates the flow and flow rate of the heat transport fluid. Six communication grooves 28 are formed in this embodiment, but the number is not limited. The number, position, shape, etc. of the communication groove 28 can be appropriately changed to adjust the flow and flow rate of the heat transport fluid.

  The side overhanging portion 29 is a portion overhanging rearward from both left and right sides on the rear side of the frame portion 22. The side projecting 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 overhanging portion 24 is formed to be point-symmetrical to the front overhanging portion 23. Since the configuration of the rear overhanging portion 24 is the same as that of the front overhanging portion 23, the same reference numeral as that of the front overhanging portion 23 is given and the description thereof is omitted. Further, similarly to the front side, the partition wall portion 26 is also connected to the rear overhang portion 24.

  The cover plate 31 is a plate-shaped member that covers the frame member 21, as shown in FIG. 2. The lid plate 31 is formed in a planar shape that is substantially the same as the outer edge of the frame member 21. A front projecting portion 33 projecting forward is formed in the center of the front side of the cover plate 31. A rear projecting portion 34 projecting rearward is formed at the center of the rear side of the cover plate 31.

  An opening 35 is formed in the center of each of the front overhanging portion 33 and the rear overhanging portion 34. One of the openings 35, 35 serves as an inlet for the heat-transporting fluid and the other serves as an outlet. Positioning holes 36 are formed on the sides of the opening 35, respectively. The positioning hole 13 of the base plate 11, the positioning hole 27 of the frame member 21, and the positioning hole 36 of the lid plate 31 are formed so as to communicate with each other. Side projections 37, 37 projecting rearward are formed on the left and right sides of the rear side of the cover plate 31. The side projecting portion 37 has the same shape as the side projecting portion 29 of the frame member.

  As shown in FIG. 2, the fin body 3 is a portion having a plurality of flow paths through which the heat transport fluid flows. The fin body 3 includes 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 a high thermal conductivity, and both are formed of aluminum or an aluminum alloy in this embodiment. The first fin portion 41 includes 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 includes a second substrate 52 and a plurality of second fins 53 that hang down from the second substrate 52. The second fins 53 are columnar bodies having a parallelogram in plan view and all have the same shape. The first fin 43 and the second fin 53 have the same shape. That is, the plate thickness dimension T, the height dimension, and the length dimension of the first fin 43 and the second fin 53 are the same. Further, the orientation angles of the respective first fins 43 with respect to the first substrate 42 are all the same. Further, the orientation angles of the respective second fins 53 with respect to the second substrate 52 are all the same.

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

  FIG. 4B is an enlarged plan view of the zigzag fin according to the present embodiment, and FIG. 4C is an enlarged plan view of the zigzag fin according to the modified example. As shown in FIG. 4B, in the present embodiment, the side end faces 43b of the first fins 43 and the side end faces 53b of the second fins 53 that are adjacent to each other in the front-rear direction are in surface contact with each other. In the present embodiment, the first fin 43 and the second fin 53 are butted so that the contact margin is equal to the plate thickness dimension 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, which are adjacent to each other in the front-rear direction, are butted against each other so as to exactly overlap with each other. The plate thickness dimension T is the length of the first fin 43 and the second fin 53 on the horizontal axis.

  On the other hand, as shown in FIG. 4C, the first fins 43 and the second fins 53 may be laterally offset and abutted. In this case, the side end surface 43b of the first fin 43 and the side end surface 53b of the second fin 53 which face each other are set so that the contact margins of the first fin 43 and the second fin 53 are T/2 or more and less than T. Make surface contact. As a result, a step R is formed at the abutting portion of the first fin 43 and the second fin 53. When the heat transport fluid flows through the heat medium flow path, the heat transport fluid collides with the step R to generate a turbulent flow.

  Next, a method for manufacturing the liquid cooling jacket according to this embodiment will be described. The manufacturing method of the liquid cooling jacket according to the present embodiment is 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. Then, the second fin portion arranging step, the frame member arranging step, the lid plate arranging step, and the brazing step are performed.

  The first preparation step is a step of preparing the first profile 61A as shown in FIGS. 5(a) and 5(b). In addition, the second preparation step is a step of preparing the second shape member 61B. The first shape member 61A and the second shape member 61B are the same member in this embodiment.

  The first profile 61A has a plate-shaped first substrate 62A and a plurality of first ridges 63A rising from the first substrate 62A. The first substrate 62A is shaped so as to be arranged 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 ridge portions 63A extend in the left-right direction and are arranged in parallel with each other. The number of the first convex streak portions 63A may be set as appropriate, but in the present embodiment, there are five rows.

  The height dimension and the length dimension in the front-rear direction of each first ridge portion 63A are the same. A groove 64A is formed between the adjacent first ridges 63A, 63A and on the rear side of the rearmost first ridge 63A. The longitudinal dimension of the groove 64A (the distance between the first ridges 63A, 63A) 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 shown in FIGS. 5A and 5B, the second profile member 61B has a second substrate 62B and a plurality of second ridges 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, they are distinguished by adding "B" to the end of the reference numerals, and detailed description thereof will be omitted.

  As shown in FIGS. 6A and 6B, the first cutting step is a step of cutting the first profile 61A with the multi-cutter M to form the plurality of first fins 43. 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 disc cutter M2 arranged 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 between the adjacent zigzag fins P, P (dimension in the direction orthogonal to the flow path direction) as shown in FIG. 4B. The gap between the adjacent disc cutters M2 and M2 is the same as the plate thickness of the zigzag fins P (dimension in the direction orthogonal to the flow path direction).

  In the first cutting step, as shown in FIGS. 6A and 6B, the rotation center axis C of the multi-cutter M is angle α with respect to the left-right direction axis (extending direction of the first ridge 63A). The first ridge portion 63A is cut obliquely. 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 63A. The angle α may be set as appropriate, for example, 0°<α<60°, and more preferably 5°<α<45°. In the first cutting step, the multi-cutter M is relatively moved four times to cut the entire first ridge portion 63A. As shown in FIG. 6B, a plurality of rows (five rows in the present embodiment) of the first fin group constituted by the plurality of first fins 43 having the same shape are formed by the first cutting process. Each first fin group and each groove 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 43a of the first fin 43 to form a brazing material layer. Before cutting the first ridge 63A with the multi-cutter M, a brazing material may be applied in advance to the tip surface of the first ridge 63A.

  The second cutting process is the same as the first cutting process. As shown in FIG. 6B, a plurality of rows (five rows in the present embodiment) of second fin groups each including a plurality of second fins 53 having the same shape are formed by the second cutting process. Each second fin group and each groove 64B are alternately formed in the front-rear direction. After the second fin 53 is formed, a brazing material is applied to the tip end surface 53a of the second fin 53 to form a brazing material layer. Before cutting the second ridge 63B with the multi-cutter M, a brazing material may be applied in advance to the tip surface of the second ridge 63B.

  Note that the angle α° may be changed in the first cutting process and the second cutting process, but if it is set to be the same as in this embodiment, the manufacturing cost can be reduced.

  The first fin portion disposing step (arranging step) is a step of disposing the first fin portion 41 on the base plate 11. As shown in FIG. 7, in the first fin portion placement step, the first fin portion 41 is placed in the recess 12 of the base plate 11. A brazing material layer is formed in advance by applying a brazing material to the upper surface 11 a of the base plate 11 and the bottom surface of the recess 12. The upper surface 11a of the base plate 11 and the upper surface 42a of the first substrate 42 are flush with each other by the first fin portion arranging step.

  The second fin portion arranging step (arranging step) is a step of overlapping the first fin portion 41 and the second fin portion 51 so as to 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 formed of the plurality of second fins 53 of the second fin portion 51 are inserted into the respective concave grooves 64A of the first fin portion 41. In addition, each first fin group configured by the plurality of first fins 43 of the first fin portion 41 is inserted into each groove 64B of the second fin portion 51. In other words, in the second fin portion arranging step, the first fin portion 41 and the second fin portion 51 are opposed to each other, and the first substrate 42 and the second substrate 52 are arranged so as to exactly overlap in the vertical direction. . As a result, the upper surface 42a of the first substrate 42 and the tip surface 53a of the second fin 53 come into contact with each other, and the upper surface 52a of the second substrate 52 and the tip surface 43a of the first fin 43 come into contact with each other. FIG. 9 is a perspective view showing a state after the second fin portion arranging step.

  The frame member arranging step is a step of arranging the frame member 21 on the upper surface 11a of the base plate 11, as shown in FIG. Thereby, the partition wall 26 on the front side is arranged so as to face the inlet side of the fin body 3 (flow path Q). The positioning holes 27, 27 of the frame member 21 and the positioning holes 13, 13 of the base plate 11 are communicated with each other, and positioning pins (not shown) are inserted for positioning. A first fin portion 41 and a second fin portion 51 are arranged inside the frame member 21 (hollow portion). The upper surface 21a of the frame member 21 and the lower surface (exposed surface) 52b of the second substrate 52 are flush with each other.

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

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

  According to the method for manufacturing the liquid cooling jacket described above, the first fin group of the first fin section 41 and the second fin group of the second fin section 51 formed by cutting with the multi-cutter M are made to face each other, and The one fin group and the second fin group are inserted so as to be alternately arranged. Thereby, the fin body 3 having the plurality of zigzag fins P can be easily formed. Moreover, since the flow path Q of the fin body 3 is zigzag, the contact area between the heat transport fluid and the zigzag fins P is increased, and the cooling efficiency can be improved. Further, since the gap dimension S of the flow path Q (see (b) and (c) of FIG. 4) is formed uniformly, the cooling temperature of the upper surface and the lower surface of the liquid cooling jacket 1 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 horizontal axis of the first fin 43 and the second fin 53). However, the contact margin may be T/2 or more and less than T. As a result, the step portion R (see (c) of FIG. 4) is formed, so that the heat transport fluid collides with the step portion R and a turbulent flow is generated. Thereby, the cooling efficiency can be further enhanced. If the contact margin is less than T/2, the flow resistance increases and the turbulence increases too much, which deteriorates the flow of the heat transport fluid.

  Further, as in the present embodiment, the first fin portion 41 and the second fin portion 51 forming the fin main body 3 have the same shape, so that the forming process of these members becomes easy. Further, the fin body 3 can be easily manufactured 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 the brazing material layer.

  Further, the housing 2 that houses the fin body 3 may have any structure as long as it can house the fin 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. In addition, in the present embodiment, in addition to brazing the housing 2 and the fin body 3, brazing of the first fin portion 41 and the second fin portion 51 can be performed at the same time, so that the manufacturing cycle can be shortened. You can Moreover, the water tightness of the liquid cooling jacket 1 can be improved by brazing.

  11A is a schematic plan view of the inside of the liquid cooling jacket according to the present embodiment, and FIG. 11B is an enlarged view around the partition wall portion. In addition, in FIG. 11, dots are added 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 front side opening portion 35, and the front side through hole 25, the communication groove 28, the zigzag flow path Q, The communication groove 28 on the rear side and the through hole 25 flow in this order and flow out from the opening 35.

  The partition wall portion 26 may be provided as needed. However, when the partition wall portion 26 is not provided, there is a problem that the strength around the opening portion 35 becomes low. The front projecting portions 23 and 33 and the rear projecting portions 24 and 34 of the frame member 21 and the cover plate 31 are portions where fastening means such as screws for attaching a heating element (not shown) or other parts are fastened. Therefore, the strength is required to withstand the fastening force. Further, when the partition wall portion 26 is not provided, a large amount of the heat transport fluid that has flowed in from the opening portion 35 flows in the central flow passage Q of the liquid cooling jacket 1, and it becomes difficult for the heat transport fluid to flow in the flow passages Q on both ends. As a result, there is a problem that the cooling temperatures on the upper surface and the lower surface of the liquid cooling jacket 1 become non-uniform.

  However, according to the present embodiment, by providing the partition wall portion 26, the strength around the portion where the fastening means is inserted can be increased. Further, by providing the partition wall portion 26 and providing the communication grooves 28 on the left and right ends of the partition wall portion 26, the heat transport fluid can easily flow in the flow passages Q on both end sides than the central flow passage Q. That is, by providing the partition wall portion 26 and the communication groove 28, the flow and flow rate of the heat transport fluid can be adjusted, so that the cooling temperature of the upper surface and the lower surface of the liquid cooling jacket 1 can be made uniform. Further, the partition wall portion 26 may be formed in a linear shape, but when the partition wall portion 26 is formed in an arc shape so as to be convex inside the frame member 21, the heat transport fluid flows radially and heat is generated in the flow paths Q on both end sides. The transport fluid is more easily distributed.

[First modification]
FIG. 12 is an exploded perspective view showing the first modified example. The liquid cooling jacket 1A according to the first modification includes a base plate 11, three fin bodies 3, a frame member 21A, and a lid plate 31. The liquid cooling jacket 1A differs from the above-described embodiment in that a plurality of fin bodies 3 are laminated. In the first modified example, parts that are the same as those in the above-described embodiment are given common reference numerals and description thereof will be omitted.

  As shown in FIG. 12, three fin bodies 3 are stacked on the base plate 11. The fin body 3 is composed of the first fin portion 41 and the second fin portion 51, respectively, as in the above-described embodiment. Inside the fin body 3, a plurality of zigzag fins P are formed and a plurality of flow paths Q are formed. In the first modification, the flow paths Q of the lower, middle, and upper fin bodies 3 are arranged at positions that exactly overlap each other in the vertical direction. Intervening sheets 71, 71 are arranged between the fin bodies 3, 3, respectively. The interposition sheet 71 is composed of, for example, a base layer and a pair of brazing material layers formed on the front and back surfaces of the base layer.

  The frame member 21A has a height dimension larger than that of the frame member 21 of the above-described embodiment. When the frame member 21A is arranged 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 fin body 3 located at the top are flush with each other.

  When manufacturing the liquid cooling jacket 1</b>A, the three fin bodies 3 are laminated on the base plate 11, and the interposition sheet 71 is arranged between the fin bodies 3 and 3. Further, the frame member 21A is arranged on the base plate 11, and the frame member 21A is covered with the cover plate 31.

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

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

  Further, in the manufacturing method according to the first modified example, by providing the interposition sheet 71 between the fin bodies 3 and 3, the base plate 11, the frame member 21A and the lid plate 31 are brazed during the brazing process. In addition, the fin bodies 3 can be easily fixed to each other.

  Although the embodiment and the first modification of the present invention have been described above, the design can be changed as appropriate within the scope not departing from the spirit of the present invention. The housing 2 of the present embodiment is composed of the three members of the base plate 11, the frame member 21, and the lid plate 31, but may be composed of, for example, a box-shaped body and a lid plate. Further, in the present embodiment, the housing 2 and the fin body 3 are integrated by brazing, but they may be joined in another form.

  Further, in the present embodiment, the brazing material layer is formed on the base plate 11, the front end surface 43a of the first fin 43, the front end surface 53a of the second fin 53, and the lower surface 31b of the lid plate 31, but the base plate 11, the frame member. The brazing material layer may be formed on at least one of the portions where the fin 21, the fin body 3 and the cover plate 31 are butted against each other. 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 is allowed to flow in from one opening 35 and the heat transport fluid is allowed to flow out from the other opening 35, but the present invention is not limited to this. For example, the frame member (peripheral wall portion) 21 may be provided with a pair of openings. Further, for example, instead of the housing 2, a pair of header pipes that are connected to the inlet side and the outlet side of the fin body 3 (flow passage Q) may be provided.

  Further, in the present embodiment, the partition wall portions 26 are provided on both the front side and the rear side of the frame member 21, but they may be provided only at least on the front side.

  Further, as shown in (a) and (b) of FIG. 5, after forming the first shape member 61A and the second shape member 61B 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 shape member 61A and the second shape member 61B are formed by extrusion molding, a slight unevenness may occur in the first shape member 61A and the second shape member 61B. Therefore, in the first preliminary cutting step, a cutting process (fine correction process) is performed using the multi-cutter M in order to adjust the shapes of the first convex streak portion 63A and the concave groove 64A. In the first preliminary cutting step, the rotation center axis C of the multi-cutter M is arranged parallel to the front-rear direction 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. As a result, it is possible to form the first convex streak portion 63A and the concave groove 64A that are not uneven. The second preliminary cutting step is also performed in the same manner as the first preliminary cutting step.

1 Liquid Cooling Jacket 2 Housing 3 Fin Body 11 Base Plate 21 Frame Member (Peripheral Wall)
25 through hole 26 partition wall 28 communication groove 31 cover plate 41 first fin portion 42 first substrate 43 first fin 43a tip surface 43b side end surface 51 second fin portion 52 second substrate 53 second fin 53a tip surface 53b side end surface M Multi-cutter M1 Shaft M2 Disk cutter P Zigzag fin Q Flow path T Plate thickness dimension R Step

Claims (1)

A liquid cooling jacket having a fin body having a plurality of zigzag single-layer channels, and a housing to which the fin body is fixed,
The casing includes a peripheral wall portion, a base plate that covers one side of the peripheral wall portion, a lid plate that covers the other side of the peripheral wall portion, an opening through which a heat transport fluid flows from the outside, and the heat transport fluid. And an opening that flows out to the outside,
A partition wall portion is formed which faces the inlet of the fin body and has both ends connected to the peripheral wall portion, and the heat transport fluid flowing into the space surrounded by the peripheral wall portion and the partition wall portion is formed in the partition wall portion. A liquid cooling jacket, characterized in that a communication groove that leads to the inside of the peripheral wall portion is formed, and a plurality of fin bodies are laminated and fixed to each other via a brazing material layer .

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