Cooling device and method for manufacturing the cooling device

Abstract

To provide a technology to inhibit cooling liquid from leaking from a gap between a hollow device body and a joined member joined to an opening of the device body.SOLUTION: A cooling device includes: a casing in which mating surfaces of a first plane of an upper component member having the first plane and a first concave part recessed from the first plane and a second plane of a lower component member having the second plane and a second concave part recessed from the second plane are joined so that a space through which cooling liquid is circulated is formed by the first concave part and the second concave part, and an opening 131 for communicating the inside of the space with the outside is formed; and an inflow pipe 3 having a cylinder-shaped cylinder part 31 and a protrusion part 32 protruding to the outside from an outer peripheral surface of the cylinder part 31, which is joined to the casing when laser light L is radiated to the protrusion part 32 in a state that the protrusion part 32 abuts against an edge 132 of the opening 131.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a cooling device and a method for manufacturing a cooling device. [Background technology]

[0002] For example, Patent Document 1 describes a technology for preventing leakage of cooling liquid from a gap between the inner surface of a cylindrical pipe connection part in the casing and the outer surface of the pipe in a liquid-cooling type cooling device that includes a hollow casing and a round pipe connected to the casing to allow cooling liquid to flow into the casing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-195912 A Summary of the Invention [Problem to be solved by the invention]

[0004] The technology described in Patent Document 1 leaves room for further improvement in terms of suppressing leakage of the coolant. The present invention aims to provide a cooling device, etc. that can prevent cooling liquid from leaking from the gap between a hollow device body and a member to be joined to an opening of the device body. [Means for solving the problem]

[0005] The present invention, which was completed with this objective in mind, is a cooling device comprising: a first member having a first plane and a first recess recessed from the first plane; and a second member having a second plane and a second recess recessed from the second plane, wherein the mating surfaces of the first plane and the second plane are joined together so that a space through which cooling liquid flows is formed by the first recess and the second recess, and an opening is formed connecting the inside of the space to the outside; and a joined member having a cylindrical portion and a protrusion protruding outward from the outer peripheral surface of the cylindrical portion, the protrusion abutting the edge of the opening, and being joined to the device body by irradiating the protrusion with laser light. Here, the laser light may be irradiated so as to follow the shape of the edge of the opening. In addition, the first member may have a first connecting portion connecting the first plane and the first recess, and the second member may have a second connecting portion connecting the second plane and the second recess, and the laser light may be irradiated to follow the shapes of the first connecting portion and the second connecting portion. In addition, the part of the joined member that is closer to the device body than the protruding portion of the tubular portion may be inserted through the opening, and the laser light may be irradiated outside the gap between the first connecting portion and the second connecting portion and the outer peripheral surface of the tubular portion. The laser light may be irradiated in a center line direction of the cylindrical portion or in a direction intersecting the center line direction. The laser beam may be irradiated so that the irradiation position moves alternately to one side and the other side of a direction intersecting with the welding direction. Also, from another perspective, the present invention is a method for manufacturing a cooling device, comprising the steps of: manufacturing an apparatus main body having a space through which a cooling liquid flows and an opening connecting the space to the outside; bringing a member to be joined to the apparatus main body, the member having a cylindrical tubular portion and a protrusion protruding outward from the outer peripheral surface of the cylindrical portion, into contact with the edge of the opening; and irradiating the protrusion with laser light. Here, the step of irradiating the laser light may include irradiating the laser light so as to follow the shape of an edge of the opening. Effect of the Invention

[0006] According to the present invention, it is possible to prevent the cooling liquid from leaking from the gap between the device body and the joined member. [Brief description of the drawings]

[0007] [Figure 1] 1 is a diagram showing an example of a schematic configuration of a liquid-cooling type cooling device according to an embodiment; [Diagram 2] FIG. 2 is a diagram showing an example of an internal structure of a liquid-cooling type cooling device as viewed from above. [Diagram 3] FIG. 3 is a cross-sectional view of the line III-III in FIG. 2. [Figure 4] 4 is a cross-sectional view taken along line IV-IV of FIG. 2, showing the pipe connection and the cylindrical portion of the inlet pipe inserted into the pipe connection; FIG. [Diagram 5] This is a view of the inlet pipe and the casing as viewed from the right side, with the irradiation position of the laser light indicated by the thick line. [Figure 6] FIG. 2 is a diagram illustrating a laser welding process. [Figure 7] FIG. 4 is a diagram showing a laser light irradiation position. [Figure 8] FIG. 13 is a diagram showing a modified example of the inlet pipe. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. FIG. 1 is a diagram showing an example of a schematic configuration of a liquid-cooling type cooling device 1 according to an embodiment. FIG. 2 is a diagram showing an example of an internal structure of the liquid-cooling type cooling device 1 as viewed from above. FIG. 3 is a cross-sectional view taken along line III-III of FIG. In the following description, the lower, upper, left and right sides of Figure 2 will be referred to as the "front", "rear", "left" and "right" sides of the liquid-cooling device 1, respectively, and the lower and upper sides of Figure 3 will be referred to as the "lower" and "upper" sides of the liquid-cooling device 1, respectively.

[0009] The liquid-cooling type cooling device 1 includes a hollow casing 2, an inlet pipe 3 joined to the casing 2 for introducing the cooling liquid into the casing 2, and an outlet pipe 4 joined to the casing 2 for introducing the cooling liquid out of the casing 2. The liquid-cooling type cooling device 1 also includes corrugated fins 23 in the casing 2. Note that parts of the casing 2 and the corrugated fins 23 that have the same shapes and functions as the casing (2) and the corrugated fins (23) described in Patent Document 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

[0010] (Casing 2, Corrugated Fin 23) The casing 2 has a top wall 6, a bottom wall 7 and a peripheral wall 8, and is equipped with a casing body 5 through which a coolant flows, a coolant inlet portion 9 formed integrally with the casing body 5, and a coolant outlet portion 11 formed integrally with the casing body 5. The peripheral wall 8 is composed of a front wall portion 8a, a rear wall portion 8b, a left wall portion 8c, and a right wall portion 8d.

[0011] The coolant inlet 9 is connected to the casing main body 5 and has a square cylindrical base 12 that is the same height as the casing main body 5. The coolant inlet 9 is connected to the right end of the base 12 and has a cylindrical pipe connection 13 that has an outer diameter the same as the front-to-rear width of the outer surface of the base 12. The upper surface of the base 12 is flush with the upper surface of the top wall 6 of the casing main body 5, the lower surface with the lower surface of the bottom wall 7, and the rear surface with the rear surface of the rear wall 8b of the peripheral wall 8. The front surface of the base 12 is perpendicular to the right surface of the right side wall 8d of the peripheral wall 8.

[0012] The coolant outlet 11 is connected to the casing body 5 and has a square cylindrical base 14 that is the same height as the casing body 5. The coolant outlet 11 is connected to the right end of the base 14 and has a cylindrical pipe connection 15 that has an outer diameter the same as the front-to-rear width of the outer surface of the base 14. The upper surface of the base 14 is flush with the upper surface of the top wall 6 of the casing body 5, the lower surface with the lower surface of the bottom wall 7, and the front surface with the front surface of the front wall 8a of the peripheral wall 8. The rear surface of the base 14 is at a right angle with the right surface of the right side wall 8d of the peripheral wall 8.

[0013] The casing 2 has an upper component member 16 made of aluminum and a lower component member 17 made of aluminum that is symmetrical to the upper component member 16 in the vertical direction. The upper component 16 has a top wall forming portion 16a which forms the top wall 6, a peripheral wall forming portion 16b which forms the upper half of the peripheral wall 8, a base forming portion 16c which forms the upper half of the bases 12, 14 of the coolant inlet portion 9 and the coolant outlet portion 11, and a connection forming portion 16d which forms the upper half of the pipe connection portions 13, 15 of the coolant inlet portion 9 and the coolant outlet portion 11.

[0014] The lower component 17 has a bottom wall forming portion 17a which forms the bottom wall 7, a peripheral wall forming portion 17b which forms the lower half of the peripheral wall 8, a base forming portion 17c which forms the lower half of the bases 12, 14 of the coolant inlet portion 9 and the coolant outlet portion 11, and a connection forming portion 17d which forms the lower half of the pipe connection portions 13, 15 of the coolant inlet portion 9 and the coolant outlet portion 11.

[0015] One of the base forming portion 16c and the base forming portion 17c (for example, the base forming portion 16c) is a semi-rectangular tube that opens to the other side (for example, the base forming portion 17c side). One of the connection forming portion 16d and the connection forming portion 17d (for example, the connection forming portion 16d) is a semi-cylindrical tube that opens to the other side (for example, the connection forming portion 17d side).

[0016] The upper component 16 has an outward flange 18 that protrudes outward from the lower ends of the peripheral wall forming portion 16b, the base forming portion 16c, and the connection portion forming portion 16d. A surface 181 of the outward flange 18 facing the lower component 17 is flat, and a first recess 28 recessed from the surface 181 is formed by the top wall forming portion 16a, the peripheral wall forming portion 16b, the base forming portion 16c, and the connection portion forming portion 16d.

[0017] The lower component 17 has an outward flange 19 that protrudes outward from the upper ends of the peripheral wall forming portion 17b, the base forming portion 17c, and the connection portion forming portion 17d. A surface 191 of the outward flange 19 facing the upper component 16 is flat, and a second recess 29 recessed from the surface 191 is formed by the bottom wall forming portion 17a, the peripheral wall forming portion 17b, the base forming portion 17c, and the connection portion forming portion 17d.

[0018] The upper component 16 and the lower component 17 are each formed by pressing a metal plate made of an aluminum brazing sheet having a solder layer on the side on which the corrugated fin 23 is to be placed, using two dies (not shown). Thereafter, the outward flange 18 of the upper component 16 and the outward flange 19 of the lower component 17 are brazed together to be integrated into the casing 2.

[0019] The corrugated fin 23 is disposed in the casing body 5 between the left side wall 8c and the right side wall 8d, and also in a portion between the coolant inlet 9 and the coolant outlet 11 in the front-rear direction. The corrugated fin 23 has its crest brazed to the top wall 6 and its trough brazed to the bottom wall 7. The corrugated fin 23 forms a plurality of flow paths 24 aligned in the left-right direction, which extend in the front-rear direction and through which the coolant flows in the front-rear direction.

[0020] Within the casing body 5, there is formed an inlet header section 26, the portion rearward of the multiple flow paths 24 of which leads to the coolant inlet section 9, and an outlet header section 27, the portion forward of the multiple flow paths 24 of which leads to the coolant outlet section 11.

[0021] (Inlet pipe 3, outlet pipe 4) 2, the inflow pipe 3 has a cylindrical portion 31 and an annular protruding portion 32 that protrudes outward from the outer circumferential surface of the cylindrical portion 31 over the entire circumference. The outer diameter of the cylindrical portion 31 is smaller than the inner diameter of the pipe connection portion 13 of the coolant inflow portion 9 of the casing 2, and the outer diameter of the protruding portion 32 is larger than the outer diameter of the pipe connection portion 13. The inflow pipe 3 is joined to the casing 2 by laser welding, with the portion of the cylindrical portion 31 to the left of the protrusion 32 inserted into the pipe connection portion 13 of the casing 2 and the protrusion 32 abutting the edge 132 of the opening 131 of the pipe connection portion 13.

[0022] The outflow pipe 4 has a cylindrical portion 41 and an annular protruding portion 42 that protrudes outward from the outer circumferential surface of the cylindrical portion 41 over the entire circumference. The outer diameter of the cylindrical portion 41 is smaller than the inner diameter of the pipe connection portion 15 of the coolant outflow portion 11 of the casing 2, and the outer diameter of the protruding portion 42 is larger than the outer diameter of the pipe connection portion 15. The outflow pipe 4 is joined to the casing 2 by laser welding, with the portion of the cylindrical portion 41 to the left of the protrusion 42 being inserted into the pipe connection portion 15 of the casing 2 and the protrusion 42 abutting the edge 152 of the opening 151 of the pipe connection portion 15.

[0023] The inlet pipe 3 and the outlet pipe 4 are made of aluminum and are formed by cutting. For example, the inlet pipe 3 and the outlet pipe 4 can be formed by cutting the outer circumferential surface of an aluminum pipe that has been subjected to drawing, to form the protrusions 32 and 42. The inner circumferential surfaces and left and right ends of the inlet pipe 3 and the outlet pipe 4 may also be formed by cutting. The manner in which the inlet pipe 3 and the outlet pipe 4 are joined to the casing 2 will be described in detail later.

[0024] In the liquid-cooling type cooling device 1 configured as described above, the semiconductor element P, which is a heat generating element, is joined to the outer surface of the top wall 6 of the casing body 5 via the plate-shaped insulating member I. The cooling liquid sent from a cooling liquid supply piping (not shown) into the inlet pipe 3 passes through the cooling liquid inlet section 9 and reaches the inlet header section 26 in the casing body 5. The cooling liquid that has reached the inlet header section 26 is branched into multiple flow paths 24, flows forward, and reaches the outlet header section 27. The cooling liquid that has reached the outlet header section 27 passes through the outlet pipe 4 and is sent into a cooling liquid discharge piping (not shown). Heat generated from the semiconductor element P is transferred to the cooling liquid flowing in the flow passage 24 via the insulating member I, the top wall 6 of the casing body 5, and the corrugated fins 23, and the semiconductor element P is cooled.

[0025] (Welding of inlet pipe 3 and outlet pipe 4) Next, a mode of laser welding the inflow pipe 3 and the outflow pipe 4 to the casing 2 will be described. Note that the shapes of the inflow pipe 3 and the outflow pipe 4 are the same, and the shapes of the pipe connection part 13 of the coolant inflow part 9 and the pipe connection part 15 of the coolant outflow part 11 are the same. Also, the mode of laser welding the inflow pipe 3 to the casing 2 is the same as the mode of laser welding the outflow pipe 4 to the casing 2. Below, the shape of the pipe connection part 13 and the mode of laser welding the inflow pipe 3 to the casing 2 will be described, and a description of the shape of the pipe connection part 15 and the mode of laser welding the outflow pipe 4 to the casing 2 will be omitted.

[0026] 4 is a diagram showing pipe connection portion 13 and cylindrical portion 31 of inflow pipe 3 inserted into pipe connection portion 13, and is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a diagram of the inflow pipe 3 and the casing 2 as viewed from the right side, with the irradiation position of the laser light L indicated by a thick line. FIG. 6 is a diagram illustrating the laser welding process.

[0027] As shown in FIG. 4, an arc-shaped connecting portion 51 is formed between the connection portion forming portion 16d of the upper component 16 of the casing 2 and the outward flange 18. Also, an arc-shaped connecting portion 52 is formed between the connection portion forming portion 17d of the lower component 17 of the casing 2 and the outward flange 19. The connection portion forming portion 16d of the upper component 16, the connection portion forming portion 17d of the lower component 17, the connecting portion 51, the connecting portion 52, the outward flange 18, and the outward flange 19 form an edge 132 of an opening 131 for inserting the cylindrical portion 31 of the inlet pipe 3. And, due to the fact that the connecting portion 51 and the connecting portion 52 are arc-shaped, a gap 53 is formed between the connecting portion 51 and the connecting portion 52 and the cylindrical portion 31. As shown in FIG. 5, the protruding portion 32 of the inflow pipe 3 is formed so that the outer circumferential surface is located outside the gap 53 .

[0028] When laser welding the inflow pipe 3 to the casing 2, as shown in FIG. 6, first, the inflow pipe 3 is inserted so that the portion to the left of the protruding portion 32 (the lower side in FIG. 6) enters the pipe connection portion 13 of the casing 2, and the protruding portion 32 is abutted against the edge 132 of the opening 131 of the pipe connection portion 13 to bring the protruding portion 32 and the pipe connection portion 13 into contact with each other. Then, in a state in which the protruding portion 32 and the pipe connection portion 13 are in contact with each other, the laser head 171 of the laser device 170 irradiates the protruding portion 32 with a laser beam L from the outside (the upper side in FIG. 6). The laser source of the laser device 170 is not particularly limited. Examples of the laser source include a YAG laser, a CO2 laser, a fiber laser, a disk laser, and a semiconductor laser. The irradiation direction of the laser beam L may be a direction perpendicular to the outer surface of the protruding portion 32 (solid line in FIG. 6, in other words, the center line direction of the cylindrical portion 31), or may be a direction inclined with respect to the perpendicular direction (broken line in FIG. 6).

[0029] When irradiating the laser light L, the laser head 171 is moved so as to continuously irradiate the laser light L. At that time, the laser light L is irradiated to the outside of the gap 53 between the connecting portion 51 and the cylindrical portion 31 and the connecting portion 52. More specifically, for example, the laser head 171 is moved from the left side of FIG. 5 to the right side of FIG. 5 along the mating surface between the outward flange 18 of the upper component 16 and the outward flange 19 of the lower component 17, and the mating surface is irradiated with the laser light L. Thereafter, the laser head 171 is moved from a portion 55 (a portion on the left side in FIG. 5) outside the gap 53 on the mating surface between the outward flange 18 and the outward flange 19 along the shape of the connecting portion 51 and the shape of the connection portion forming portion 16d, and the laser light L is irradiated to the outer surface 321 of the protruding portion 32 that is in contact with the connecting portion 51 and the connection portion forming portion 16d that constitute the edge 132. Thereafter, the laser head 171 is moved along the shape of the connecting portion 51 on the right side in FIG. 5, and the laser light L is irradiated to the outer surface 321 of the protruding portion 32 that is in contact with the connecting portion 51 on the right side. Then, from a portion 56 (the portion on the right side in FIG. 5) outside the right-side gap 53 in FIG. 5, the laser head 171 is moved to the right in FIG. 5 along the mating surface between the outward flanges 18 and 19, and laser light L is irradiated onto the mating surface.

[0030] 5, the laser head 171 is moved leftward in FIG. 5 along the mating surface between the outward flange 18 and the outward flange 19, and the mating surface is irradiated with the laser light L. Then, the laser head 171 is moved from a portion 56 outside the gap 53 on the mating surface between the outward flange 18 and the outward flange 19 along the shape of the coupling portion 52 and the connection portion forming portion 17d, and the laser light L is irradiated onto the outer surface 321 of the protrusion 32 in contact with the coupling portion 52 and the connection portion forming portion 17d. Then, the laser head 171 is moved along the shape of the left coupling portion 52 in FIG. 5, and the laser light L is irradiated onto the outer surface 321 of the protrusion 32 in contact with the left coupling portion 52. Thereafter, from a portion 55 (the portion on the left side in FIG. 5) that is outside the left gap 53 in FIG. 5, the laser head 171 is moved to the left in FIG. 5 along the mating surface between the outward flanges 18 and 19, and laser light L is irradiated onto the mating surface.

[0031] In this embodiment, as described above, the laser head 171 is moved along the edge 132 and laser light L is irradiated onto the outer surface 321 of the protrusion 32 that is in contact with the edge 132, thereby performing laser welding around the cylindrical portion 31 of the inlet pipe 3 and outside the gap 53.

[0032] The liquid-cooling type cooling device 1 configured as described above is an example of a cooling device including a casing 2 as an example of a device main body, and an inlet pipe 3 and an outlet pipe 4 as an example of a joined member joined to the casing 2. The casing 2 has an upper component member 16 as an example of a first member having a surface 181 as an example of a first plane and a first recess 28 recessed from the surface 181. The casing 2 also has a lower component member 17 as an example of a second member having a surface 191 as an example of a second plane and a second recess 29 recessed from the surface 191. The mating surfaces of the surface 181 and the surface 191 are joined together so that the first recess 28 and the second recess 29 form an inlet header section 26 and an outlet header section 27 as examples of spaces through which the cooling liquid flows, and the casing 2 has openings 131 and 151 that communicate the inlet header section 26 and the outlet header section 27 with the outside. The inflow pipe 3 has a cylindrical portion 31 as an example of a cylindrical portion, and a protruding portion 32 protruding outward from the outer circumferential surface of the cylindrical portion 31, and is joined to the casing 2 by irradiating the protruding portion 32 with laser light L in a state in which the protruding portion 32 abuts against an edge 132 of the opening 131. Therefore, leakage of the coolant from a gap 53 between the casing 2 and the inflow pipe 3 is suppressed.

[0033] The laser light L is irradiated so as to follow the shape of the edge 132 of the opening 131. More specifically, the upper component 16 has a connecting portion 51 as an example of a first connecting portion that connects the outward flange 18 and the first recess 28, and the lower component 17 has a connecting portion 52 as an example of a second connecting portion that connects the outward flange 19 and the second recess 29. The laser light L is irradiated so as to follow the shapes of the connecting portions 51 and 52. In other words, the inflow pipe 3 is inserted from the opening 131 at a portion of the cylindrical portion 31 that is closer to the casing 2 than the protruding portion 32, and the laser light L is irradiated to the outside of the gap 53 between the connecting portions 51 and 52 and the outer circumferential surface of the cylindrical portion 31. This suppresses leakage of the coolant from the gap 53 between the connecting portions 51 and 52 and the cylindrical portion 31.

[0034] Moreover, the laser light L is irradiated in the center line direction of the cylindrical portion 31. This makes it possible to melt and join the protruding portion 32 and the casing 2 with high accuracy. Moreover, the laser light L may be irradiated in a direction intersecting the center line direction of the cylindrical portion 31. Even if the laser light L hits the tip portion of the cylindrical portion 31 when it is irradiated in the center line direction of the cylindrical portion 31 due to a small amount of protrusion of the protruding portion 32 from the outer circumferential surface of the cylindrical portion 31, it is possible to prevent the laser light L from hitting the tip portion of the cylindrical portion 31 by irradiating in a direction intersecting the center line direction.

[0035] The manufacturing method of the liquid-cooling type cooling device 1 described above includes the steps of manufacturing a casing 2 having inlet header section 26, outlet header section 27 as an example of a space through which the cooling liquid flows, and openings 131 and 151 connecting inlet header section 26, outlet header section 27 with the outside, a step of bringing protrusion 32 of inflow pipe 3 joined to casing 2 into contact with edge 132 of opening 131, and a step of irradiating protrusion 32 with laser light L. This manufacturing method makes it possible to prevent the cooling liquid from leaking from inside casing 2. In the step of irradiating the laser light L, the laser light L is irradiated so as to follow the shape of the edge 132 of the opening 131. This makes it possible to prevent the cooling liquid from leaking from inside the casing 2 with high reliability.

[0036] FIG. 7 is a diagram showing the irradiation position of the laser light L. When performing laser welding, if the direction in which the laser head 171 is moved along the mating surface and the shape of the edge 132 of the outward flanges 18 and 19 is defined as the welding direction, it is preferable to irradiate the laser light L so that the irradiation position moves alternately to one side and the other side in a direction intersecting the welding direction.

[0037] For example, as shown in FIG. 7(A), it is preferable to irradiate the laser beam so that the irradiation position forms a circle and the center of the circle moves in the welding direction. Alternatively, as shown in FIG. 7(B), the irradiation position may be in a direction linearly inclined with respect to the welding direction, and turning points may be alternately irradiated on one side and the other side of the direction intersecting the welding direction. Alternatively, as shown in FIG. 7(C), the irradiation position may be in the shape of a figure 8, and irradiation may be performed so that the center of the figure 8 moves in the welding direction.

[0038] Furthermore, by irradiating the laser light L so that the irradiation position moves alternately to one side and the other side in a direction intersecting the welding direction, the casing 2, the inlet pipe 3, and the outlet pipe 4 can be firmly joined, thereby highly reliably preventing leakage of cooling liquid from the gap 53.

[0039] <Modifications of inlet pipe 3 and outlet pipe 4> FIG. 8 is a diagram showing a modified example of the inlet pipe 3. In FIG. The inlet pipe 3 and the outlet pipe 4 may have the shapes described below. Since the shape of the inlet pipe 3 and the shape of the outlet pipe 4 are the same, the shape of the inlet pipe 3 will be described below, and the description of the shape of the outlet pipe 4 will be omitted.

[0040] As shown in FIG. 8(A), the inflow pipe 3 may be one in which the protrusion 32 is formed by performing bead processing on a pipe that has been subjected to drawing processing. Alternatively, the inflow pipe 3 may be one in which the protrusion 32 is formed by forging a cylindrical member, as shown in FIG. 8(B).

[0041] In the above-described liquid-cooling type cooling device 1, the casing 2 is integrated by brazing the outward flange 18 of the upper component member 16 and the outward flange 19 of the lower component member 17, but is not particularly limited to such an embodiment. For example, the casing 2 may be integrated by laser welding the outward flange 18 of the upper component member 16 and the outward flange 19 of the lower component member 17. [Explanation of symbols]

[0042] 1...liquid-cooled cooling device, 2...casing, 3...inlet pipe, 4...outlet pipe, 9...coolant inlet section, 11...coolant outlet section, 16...upper component, 17...lower component, 18, 19...outward flange, 23...corrugated fin, 26...inlet header section, 27...outlet header section, 31, 41...cylindrical section, 32, 42...projection section, 51, 52...connection section, 53...gap, 131, 151...opening section, 132, 152...edge, 170...laser device, 171...laser head, L...laser light

Claims

1. a device main body including a first member having a first plane and a first recess recessed from the first plane, and a second member having a second plane and a second recess recessed from the second plane, the first plane and the second plane being joined together at mating surfaces such that a space through which a cooling liquid flows is formed by the first recess and the second recess, and an opening portion is formed to connect the inside of the space with the outside; a member to be joined that has a cylindrical portion and a protruding portion protruding outward from an outer peripheral surface of the cylindrical portion, the protruding portion being joined to the device body by irradiating the protruding portion with a laser beam in a state in which the protruding portion abuts against an edge of the opening; Equipped with the first member has a first connecting portion that connects the first plane and the first recess, the second member has a second connecting portion connecting the second plane and the second recess, a portion of the joined member closer to the device body than the protruding portion of the cylindrical portion is inserted through the opening, The laser light is irradiated to the outside of the gap between the first connecting portion and the second connecting portion and the outer circumferential surface of the cylindrical portion, and is irradiated to a mating surface between the first flat surface provided on the outside of the first connecting portion and the second flat surface provided on the outside of the second connecting portion. Cooling device.

2. The laser light is irradiated so as to follow the shape of the edge of the opening. The cooling device according to claim 1 .

3. The laser light is irradiated so as to follow the shapes of the first connecting portion and the second connecting portion. The cooling device according to claim 2.

4. The laser light is irradiated in a direction along the center line of the cylindrical portion or in a direction intersecting the center line. A cooling device according to any one of claims 1 to 3.

5. The laser beam is irradiated so that the irradiation position moves alternately to one side and the other side in a direction intersecting the welding direction. A cooling device according to any one of claims 1 to 4.

6. A step of manufacturing a device body having a space through which a cooling liquid flows and an opening that communicates the space with the outside; a step of bringing a member to be joined to the device body, the member having a cylindrical portion and a protruding portion protruding outward from an outer circumferential surface of the cylindrical portion, into contact with an edge of the opening; irradiating the protrusion and the device body with laser light; A method for manufacturing a cooling device comprising: the device body includes a first member having a first plane, a first recess recessed from the first plane, and a first connecting portion connecting the first plane and the first recess, and a second member having a second plane, a second recess recessed from the second plane, and a second connecting portion connecting the second plane and the second recess, The contacting step includes inserting a portion of the cylindrical portion of the joined member closer to the apparatus body than the protruding portion through the opening, The step of irradiating the laser light includes irradiating the laser light to the outside of a gap between the first connecting portion and the second connecting portion and an outer peripheral surface of the cylindrical portion, and irradiating the laser light to a mating surface between the first flat surface provided on the outside of the first connecting portion and the second flat surface provided on the outside of the second connecting portion. A method for manufacturing a cooling device.

7. The step of irradiating the laser light includes irradiating the laser light so as to follow the shape of the edge of the opening. A method for manufacturing the cooling device according to claim 6.

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