JP2018061064A - Liquid-cooled jacket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid-cooled jacket having high cooling efficiency.SOLUTION: In a liquid-cooled jacket having a fin body 3 including multiple zigzag flow paths, and an enclosure to which the fin body 3 is fixed, the enclosure has a peripheral wall 21, a base plate 11 covering one side of the peripheral wall 21, a cover plate 31 covering the other side of the peripheral wall 21, an opening 35 through which heat transport fluid flows in from the outside, and the opening 35 through which the heat transport fluid flows out to the outside. A bulkhead 26 facing the inlet of the fin body 3 and having opposite ends coupled with the peripheral wall 21 is formed, and a communication groove 28 for introducing the heat transport fluid, flowing into the space surrounded by the peripheral wall 21 and the bulkhead 26, to the inside of the peripheral wall 21 is formed.SELECTED DRAWING: Figure 2

Description

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

  In recent years, electronic devices typified by personal computers have increased the amount of heat generated by a CPU (heating element) mounted as their performance has improved. In hybrid vehicles, electric vehicles, high-speed railway vehicles, and the like, power semiconductors that generate a large amount of heat are used for motor switching and the like. In order to stably operate an electronic device having a large amount of heat generation, a highly reliable cooling device is required.

  Conventionally, air-cooled fan-type heat sinks have been used to cool the heating elements, but problems such as fan noise and cooling limits in the air-cooling system have come to be highlighted. A water-cooled plate (liquid-cooled jacket) of the type is drawing attention.

  For example, Patent Document 1 discloses a liquid cooling jacket having a fin body provided with a plurality of flow paths through which a heat transport fluid such as water flows, and a housing that houses the fin body. The fin body is formed by forming an extruded profile composed of a substrate and a plurality of fins rising from the substrate, and then pressing a plurality of columnar pins between adjacent fins.

Special table 2010-134191 gazette

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

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

  In order to solve the above problems, the present invention provides a liquid cooling jacket having a fin body provided with a plurality of zigzag flow paths, and a housing to which the fin body is fixed. 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 heat transport fluid flows from the outside, and an opening through which the heat transport fluid flows out And a partition wall portion facing the inlet of the fin body and having both ends connected to the peripheral wall portion, and a space surrounded by the peripheral wall portion and the partition wall portion in the partition wall portion. A communication groove that guides the inflow heat transport fluid to the inside of the peripheral wall is formed.

  According to this configuration, since the fin body has a zigzag flow path, the contact area between the heat transport fluid and the fins can be increased, and the cooling efficiency can be increased. Moreover, the flow and flow rate of the heat transport fluid can be adjusted by forming the communication groove in the partition wall.

  Moreover, it is preferable that a plurality of the fin bodies are stacked. According to such a configuration, fins and flow paths can be increased, so that the cooling efficiency can be further increased.

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

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 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 which shows the fin main body which concerns on this embodiment, (b) is an enlarged plan view of the zigzag fin which concerns on this embodiment, (c) is an enlarged plane of the zigzag fin which concerns on a modification. FIG. It is a figure which shows the manufacturing method of the liquid cooling jacket which concerns on embodiment of this invention, Comprising: (a) is a perspective view which shows a 1st profile and a 2nd profile, (b) is sectional drawing 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 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 profile arrangement process which concerns on this embodiment. It is a perspective view which shows the 2nd profile arrangement | positioning process after this embodiment. It is a perspective view which shows the frame member arrangement | positioning process which concerns on this embodiment. (A) is a schematic plan view inside 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 liquid cooling jacket and a liquid cooling jacket manufacturing method 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, a flow path through which a heat transport fluid such as water flows is formed. In the following description, “upper and lower”, “left and right”, and “front and rear” follow the arrows in FIG. These directions are specified for convenience of explanation, and do not limit the structure of the liquid cooling jacket 1.

  As shown in FIGS. 1A and 1B, the liquid cooling jacket 1 includes a housing 2 and a fin body 3 disposed inside the housing 2. The housing 2 is a hollow member that forms 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 formed of a metal having high thermal conductivity, and in this embodiment, all are formed of aluminum or an aluminum alloy. The members constituting the liquid cooling jacket 1 may be joined in any manner, but are integrated by brazing in this embodiment.

  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 has a rectangular recess 12 and positioning holes 13 and 13 formed in a plan view. The concave portion 12 is a portion where a 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 this embodiment, the depth is substantially equal to the thickness of the first substrate 42. The recess 12 can be formed by pressing or cutting. Note that 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 certain height dimension. As shown in FIG. 1B, the height dimension of the frame member 21 may be set as appropriate, but in the present embodiment, the height dimension of the first fin 43 of the first fin section 41 and the second fin section. 51 is approximately equal to the sum of the thickness dimensions of the second substrate 52.

  As shown in FIG. 3, the frame member 21 includes frame portions 22, 22, a front overhang portion 23, a rear overhang portion 24, partition walls 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 continues to the frame portion 22 and projects to the front side. The front overhang 23 is used as a part where a heat generating body (not shown) or a screw hole for attaching other parts is formed. Further, a positioning hole 27 is formed in the front projecting portion 23. A through hole 25 is formed by being surrounded by the front projecting portion 23 and the partition wall portion 26. The through hole 25 penetrates in the vertical direction, and the heat transport fluid flows therethrough.

  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 projecting portion 23. Further, the partition wall portion 26 is formed in an arc shape in plan view so as to protrude rearward. A plurality of communication grooves 28 communicating with the through hole 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 adjusts the flow and flow rate of the heat transport fluid. Although six communication grooves 28 are formed in the present embodiment, the number is not limited. The communication groove 28 can adjust the flow and flow rate of the heat transport fluid by appropriately changing the number, position, shape, and the like.

  The side projecting portion 29 is a portion projecting rearward from the left and right sides on the rear side of the frame portion 22. The side projecting portion 29 is used as a part where a heat generating body (not shown) or a screw hole for attaching other parts is formed.

  The rear overhang portion 24 is formed so as to be point-symmetric with the front overhang 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 numerals as those of the front overhanging portion 23 are attached and description thereof is omitted. In addition, as with the front side, the partition wall portion 26 is also connected to the rear overhang portion 24.

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

  An opening 35 is formed in the center of each of the front overhang 33 and the rear overhang 34. One of the openings 35 and 35 serves as an inlet for the heat transport fluid and the other serves as an outlet. Positioning holes 36 are respectively formed on the sides of the opening 35. 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 projecting portions 37 and 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 main 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 high thermal conductivity. In the present embodiment, both are formed of aluminum or an aluminum alloy. The first fin portion 41 includes a first substrate 42 and a plurality of first fins 43 that rise from the first substrate 42. The first fins 43 are columnar bodies that have 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 depending from the second substrate 52. The second fins 53 are columnar bodies having 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 first fin 43 and the second fin 53 have the same thickness T, height, and length. The orientation angles of the first fins 43 with respect to the first substrate 42 are all the same. The orientation angles of the 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 arranging first fins 43 and second fins 53 alternately in the front-rear direction. As shown in FIG. 1B, a space surrounded by the first substrate 42, the second substrate 52, and the adjacent zigzag fins P and P becomes a flow path Q through which the heat transport fluid flows. The channels 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 modification. As shown in FIG. 4B, in this embodiment, the side end face 43b of the first fin 43 and the side end face 53b of the second fin 53 that are adjacent in the front-rear direction are in surface contact. In the present embodiment, the contact allowance between the first fin 43 and the second fin 53 is abutted so as to be equal to the plate thickness dimension T of the first fin 43 and the second fin 53. That is, the side end face 43b of the first fin 43 and the side end face 53b of the second fin 53 that are adjacent in the front-rear direction are abutted so as to be exactly overlapped. 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 shifted and abutted in the left-right direction. In this case, the side end face 43b of the first fin 43 and the side end face 53b of the second fin 53 facing each other are set so that the contact allowance between the first fin 43 and the second fin 53 is T / 2 or more and less than T. Make surface contact. Thereby, a stepped portion R is formed at the abutting portion between the first fin 43 and the second fin 53. When the heat medium channel flows, turbulent flow is generated by the heat transport fluid colliding with the stepped portion R.

  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 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 the first shape member 61A as shown in FIGS. The second preparation step is a step of preparing the second shape member 61B. The first profile 61A and the second profile 61B are the same member in this embodiment.

  The first shape member 61A includes a first substrate 62A that has a plate shape and a plurality of first protrusions 63A that rise from the first substrate 62A. The first substrate 62A has a shape that is 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 in parallel to each other. The number of the first ridges 63A may be set as appropriate, but in this embodiment, there are five rows.

  The height dimension and the length dimension in the front-rear direction of each first protrusion 63A are the same. A concave groove 64A is formed between the adjacent first ridges 63A and 63A and on the rear side of the rearmost first ridge 63A. The length dimension in the front-rear direction of the concave groove 64A (the distance between the first protrusions 63A, 63A) is the same as the length dimension in the front-rear direction of the first protrusion 63A. The molding method of the first profile 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 shape member 61B includes 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” at the end of the reference numerals, and detailed description thereof is omitted.

  The first cutting step is a step of forming the first fins 43 by cutting the first profile 61A with the multi-cutter M as shown in FIGS. The multi cutter M is a tool for cutting a metal member. The multi-cutter M is comprised by the axial part M1 and the disk cutter M2 provided in parallel by the axial part M1 with the clearance 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 (the dimension in the direction perpendicular to the flow path direction) as shown in FIG. 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 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 set to an angle α with respect to the left-right axis (the extending direction of the first ridge 63A). Tilt and cut the first ridge 63A obliquely. The cutting depth may be set as appropriate, but in the present embodiment, the cutting depth is set to be the same as the height of the first ridge 63A. The angle α may be set as appropriate. For example, 0 ° <α <60 °, 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 63A. As shown in FIG. 6 (b), a first fin group composed of a plurality of first fins 43 having the same shape is formed in a plurality of rows (5 rows in this embodiment) by the first cutting step. Each first fin group and each groove 64A are alternately formed in the front-rear direction.

  When the first fins 43 are formed, a brazing material is applied to the front end surfaces 43a of the first fins 43 to form a brazing material layer. In addition, 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. 6 (b), a plurality of second fin groups (five rows in the present embodiment) constituted by a plurality of second fins 53 having the same shape are formed by the second cutting step. Each second fin group and each groove 64B are alternately formed in the front-rear direction. When the second fin 53 is formed, a brazing material is applied to the front end surface 53a of the second fin 53 to form a brazing material layer. Note that a brazing material may be applied in advance to the tip surface of the second ridge 63B before cutting the second ridge 63B with the multi-cutter M.

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

  The first fin portion arrangement step (arrangement 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 surface of the recess 12 to form a brazing material layer. By the first fin portion arranging step, the upper surface 11a of the base plate 11 and the upper surface 42a of the first substrate 42 are flush with each other.

  A 2nd fin part arrangement | positioning process (arrangement | positioning process) is a process of superimposing so that the 1st fin part 41 and the 2nd fin part 51 may oppose. The second fin portion arrangement step corresponds to an “insertion step” in the claims. As shown in FIG. 8, each second fin group constituted by the plurality of second fins 53 of the second fin portion 51 is inserted into each concave groove 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 concave groove 64 </ b> B 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. . Thereby, 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 the second fin portion placement step.

  As shown in FIG. 10, the frame member arranging step is a step of arranging the frame member 21 on the upper surface 11 a of the base plate 11. Thereby, it arrange | positions so that the front partition part 26 may face the inlet side of the fin main body 3 (flow path Q). Positioning is performed by inserting positioning pins (not shown) while communicating the positioning holes 27, 27 of the frame member 21 with the positioning holes 13, 13 of the base plate 11. A first fin portion 41 and a second fin portion 51 are disposed 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 step is a step of covering the frame member 21 with the cover plate 31 as shown in FIG. The positioning holes 36, 36 of the lid plate 31 are inserted into positioning pins (not shown) for positioning. A brazing material is applied in advance to the lower surface of the cover plate 31 to form a brazing material layer.

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

  According to the manufacturing method of the liquid cooling jacket described above, the first fin group of the first fin part 41 and the second fin group of the second fin part 51 formed by cutting with the multi-cutter M are opposed to each other, and The first fin group and the second fin group are inserted alternately. Thereby, the fin main body 3 which has the some zigzag fin P can be formed easily. Further, since the flow path Q of the fin body 3 is zigzag, the contact area between the heat transport fluid and the zigzag fin P is increased, and the cooling efficiency can be increased. Further, since the gap dimension S (see FIGS. 4B and 4C) of the flow path Q is formed uniformly, the cooling temperature of the upper and lower surfaces of the liquid cooling jacket 1 can be made uniform.

  Further, as in this embodiment, the contact allowance 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). Length), but the contact allowance may be T / 2 or more and less than T. As a result, a stepped portion R (see FIG. 4C) is formed, and the heat transport fluid collides with the stepped portion R to generate turbulent flow. Thereby, cooling efficiency can be raised more. When the contact allowance is less than T / 2, the flow resistance increases and the turbulent flow becomes too large, 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. Moreover, the fin main body 3 can be easily manufactured by forming and brazing the brazing material layer on the front end surfaces 43 a and 53 a of the first fin 43 and the second fin 53.

  The casing 2 that accommodates the fin body 3 may have any structure as long as the fin body 3 can be accommodated. However, the base plate 11, the frame member 21, and the lid plate 31 as in the present embodiment. And can be easily manufactured by integrating them by brazing. In the present embodiment, in addition to brazing of 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. Can do. Moreover, the watertightness of the liquid cooling jacket 1 can be improved by brazing.

  FIG. 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. In FIG. 11, dots are added to the zigzag fin P. As shown in FIGS. 11A and 11B, in the liquid cooling jacket 1, the heat transport fluid flows from the front opening 35, the front through hole 25, the communication groove 28, the zigzag channel Q, It flows in the order of the rear communication groove 28 and the through hole 25 and flows out from the opening 35.

  The partition wall portion 26 may be appropriately provided as necessary. However, when there is no partition part 26, there exists a problem that the intensity | strength around the opening part 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. For this reason, the strength is sufficient to withstand the fastening force. Further, when the partition wall portion 26 is not provided, a large amount of the heat transport fluid flowing from the opening 35 flows through the central flow path Q of the liquid cooling jacket 1, and the heat transport fluid does not easily flow through the flow paths Q on both ends. Thereby, there is a problem that the cooling temperature of the upper surface and the lower surface of the liquid cooling jacket 1 becomes uneven.

  However, according to this embodiment, the strength around the part into which the fastening means is inserted can be increased by providing the partition wall portion 26. Further, by providing the partition wall portion 26 and providing the communication grooves 28 on both left and right ends of the partition wall portion 26, the heat transport fluid can easily flow into the flow channel Q on both end sides than the central flow channel 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 and lower surfaces of the liquid cooling jacket 1 can be made uniform. In addition, the partition wall portion 26 may be formed in a straight line shape, but by forming an arc shape so as to protrude toward the inside of the frame member 21, the heat transport fluid flows radially, and heat flows in the channel Q on both end sides. The transport fluid is more easily distributed.

[First modification]
FIG. 12 is an exploded perspective view showing a first modification. The liquid cooling jacket 1 </ b> A according to the first modification includes a base plate 11, three fin bodies 3, a frame member 21 </ b> A, and a lid plate 31. The liquid cooling jacket 1A is different from the above-described embodiment in that a plurality of fin bodies 3 are stacked. In the first modification, the same reference numerals are given to the portions overlapping with the above-described embodiment, and the description thereof is omitted.

  As shown in FIG. 12, three fin bodies 3 are laminated on the base plate 11. The fin main body 3 is comprised by the 1st fin part 41 and the 2nd fin part 51, respectively like the above-mentioned embodiment. A plurality of zigzag fins P are formed inside the fin body 3, 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 in the vertical direction. Between the fin bodies 3 and 3, interposed sheets 71 and 71 are disposed, respectively. The interposed 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 of the frame member 21A is 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 positioned at the top are flush with each other.

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

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

  A plurality of fin bodies 3 may be stacked as in the first modification. In the first modification, a three-layer structure is used, but 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 channels Q can be increased, and the cooling efficiency can be further increased.

  In the manufacturing method according to the first modification, the base sheet 11, the frame member 21 </ b> A, and the cover plate 31 are brazed during the brazing process by providing the interposition sheet 71 between the fin bodies 3 and 3. In addition, 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, the design can be changed as appropriate without departing from the spirit of the present invention. The housing 2 of the present embodiment is configured by three members, that is, the base plate 11, the frame member 21, and the lid plate 31, but may be configured by, for example, a box-shaped body and a lid plate. In the present embodiment, the casing 2 and the fin body 3 are integrated by brazing, but they may be joined in other forms.

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

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

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

  Further, as shown in FIGS. 5A and 5B, after the first profile 61A and the second profile 61B are formed by the first preparation process and the second preparation process, the first preliminary cutting process and the first Two preliminary cutting processes may be performed.

  Even when the first profile 61A and the second profile 61B are formed by extrusion molding, a minute unevenness may occur in the first profile 61A and the second profile 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 ridge 63A and the 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. What is necessary is just to set suitably the thickness dimension of the disk cutter M2 of the multi cutter M, and the clearance gap between the adjacent disk cutters M2. Thereby, the 1st protruding item | line part 63A and the ditch | groove 64A without unevenness can be formed. The second preliminary cutting process is performed in the same manner as the first preliminary cutting process.

DESCRIPTION OF SYMBOLS 1 Liquid cooling jacket 2 Case 3 Fin main body 11 Base plate 21 Frame member (peripheral wall part)
25 Through-hole 26 Bulkhead portion 28 Communication groove 31 Cover plate 41 First fin portion 42 First substrate 43 First fin 43a Front end surface 43b Side end surface 51 Second fin portion 52 Second substrate 53 Second fin 53a Front end surface 53b Side end surface M Multi-cutter M1 Shaft M2 Disk cutter P Zigzag fin Q Channel T Thickness R Step

Claims (2)

A liquid cooling jacket having a fin body provided with a plurality of zigzag flow paths, and a housing to which the fin body is fixed,
The housing includes a peripheral wall portion, a base plate covering one side of the peripheral wall portion, a lid plate covering the other side of the peripheral wall portion, an opening through which heat transport fluid flows from the outside, and the heat transport fluid An opening that flows out to the outside,
A partition wall portion facing the inlet of the fin body and having both ends connected to the peripheral wall portion is formed, and the heat transport fluid that has flowed into the space surrounded by the peripheral wall portion and the partition wall portion into the partition wall portion. A liquid cooling jacket characterized in that a communication groove leading to the inside of the peripheral wall portion is formed.   The liquid cooling jacket according to claim 1, wherein a plurality of the fin bodies are stacked.

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