Cooling device and cooling unit

Abstract

The present invention provides a cooling device and cooling unit that suppress deformation of the flow channel pipe due to the heat generated when joining the elbows of the cooling device. [Solution] The cooling device 100 comprises a cover 10, a first elbow 20, a second elbow 30, a first flow channel pipe 40, and a second flow channel pipe 50. The cover has a first opening 13 and a second opening 14 on its first surface 11 through which the refrigerant flows. The first elbow is located on the first surface and is connected to the first opening. The second elbow is located on the first surface and is connected to the second opening. The first flow channel pipe is located on the first surface and is connected to the first elbow. The second flow channel pipe is located on the first surface and is connected to the second elbow. When viewed from a direction perpendicular to the first surface, the first flow channel pipe extends linearly in a direction inclined with respect to the flow direction of the second elbow at a position close to the second elbow, and the second flow channel pipe bends in a direction away from the first elbow at a position close to the first elbow.

Description

Technical Field

[0001] The present disclosure relates to a cooling device and a cooling unit.

Background Art

[0002] There is known a cooling device that cools a heat source using a refrigerant flowing through an internal flow path. Patent Document 1 discloses a cooling unit in which a plurality of cooling devices are connected by a flow path pipe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a cooling device, for example, due to restrictions received from the installation location, the location where the flow path pipe is drawn into the cooling device from the outside or the location where the flow path pipe is drawn out from the cooling device to the outside may be restricted. Also, in a cooling device, there may be a case where it is desired to make the refrigerant flow in from a location with a high heat generation temperature. Further, from the viewpoint of piping workability, there may be a case where it is desired to provide some slack in the routing of the flow path pipe. Due to these circumstances, the routing of the flow path pipe with respect to the cooling device may become complicated.

[0005] When the routing of the flow path pipe with respect to the cooling device becomes complicated, an elbow for changing the direction of the refrigerant flow and the flow path pipe may be arranged close to each other. For example, a flow path pipe for supplying refrigerant from the outside to the cooling device may be arranged close to an elbow provided in a flow path pipe for sending the refrigerant discharged from the cooling device to the outside.

[0006] In the manufacturing process, elbows are joined to the cooling device by heat treatment such as brazing. However, if flow channels are located near the elbows, the heat generated when joining the elbows to the cooling device may cause the flow channels to deform.

[0007] This disclosure provides a technology that can suppress deformation of the flow channel pipe due to heat generated when joining elbows. [Means for solving the problem]

[0008] A cooling device according to one aspect of the present disclosure comprises a cover, a first elbow, a second elbow, a first flow channel pipe, and a second flow channel pipe. The cover has a first opening and a second opening on its first surface through which a refrigerant flows. The first elbow is located on the first surface and connected to the first opening. The second elbow is located on the first surface and connected to the second opening. The first flow channel pipe is located on the first surface and connected to the first elbow. The second flow channel pipe is located on the first surface and connected to the second elbow. Viewed from a direction perpendicular to the first surface, the first flow channel pipe extends linearly in a direction inclined with respect to the flow direction of the second elbow at a position close to the second elbow, or the second flow channel pipe bends in a direction away from the first elbow at a position close to the first elbow. [Effects of the Invention]

[0009] According to this disclosure, deformation of the flow channel pipe due to heat generated when joining elbows can be suppressed. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a schematic plan view of a cooling device according to an embodiment. [Figure 2] Figure 2 is an enlarged plan view showing the distance between the second elbow and the first flow channel pipe according to the embodiment. [Figure 3] Figure 3 is a schematic perspective view of the cooling unit according to this embodiment. [Modes for carrying out the invention]

[0011] The following describes in detail, with reference to the drawings, embodiments for implementing the cooling device and cooling system according to this disclosure (hereinafter referred to as "Embodiments"). However, this disclosure is not limited by these embodiments. Furthermore, each embodiment can be combined as appropriate, provided that the processing content is not inconsistent. Also, the same parts are denoted by the same reference numerals in each of the following embodiments, and redundant descriptions are omitted.

[0012] Furthermore, in the drawings referenced below, for the sake of clarity, mutually orthogonal X-axis, Y-axis, and Z-axis directions are defined, and a Cartesian coordinate system is shown with the Z-axis direction being vertically upward. In addition, the negative Y-axis direction may be referred to as the first direction (one side), and the positive Y-axis direction as the other side of the first direction. The negative X-axis direction may be referred to as the second direction (one side), and the positive X-axis direction as the other side of the second direction.

[0013] (Embodiment) <Cooling system configuration> First, the configuration of the cooling device 100 according to the embodiment will be described with reference to Figures 1 to 3. Figure 1 is a schematic plan view of the cooling device 100 according to the embodiment. Figure 2 is an enlarged plan view showing the distance between the second elbow 30 and the first flow channel pipe 40 according to the embodiment. Figure 3 is a schematic perspective view of the cooling unit 200 according to the embodiment.

[0014] As shown in Figure 1, the cooling device 100 comprises a cover 10, a first elbow 20, a second elbow 30, a first flow channel pipe 40, and a second flow channel pipe 50.

[0015] The cover 10 forms an internal space through which the refrigerant can flow. The refrigerant is, for example, a coolant. As the coolant, for example, an antifreeze such as an aqueous solution of ethylene glycol or propylene glycol, or pure water can be used.

[0016] The cover 10 has a first surface 11 and a second surface 12 (see Figure 3) located opposite the first surface 11. The first surface 11 and the second surface 12 may be rectangular in plan view. In the example shown in Figure 1, the long sides of the first surface 11 and the second surface 12 extend along the Y-axis, and the short sides extend along the X-axis. The first surface 11 and the second surface 12 may be, for example, flat surfaces. The first surface 11 has a first opening 13 and a second opening 14 through which the refrigerant flows. For example, the first opening 13 is an inlet through which the refrigerant flows into the cover 10, and the second opening 14 is an outlet through which the refrigerant flows out of the cover 10. In this case, the refrigerant flows from the first flow channel 40 into the interior of the cover 10 through the first opening 13, flows through the interior of the cover 10, and then flows out into the second flow channel 50 through the second opening 14.

[0017] The cover 10 may be in contact with the heat-generating component on its second surface 12. In this case, the heat generated in the heat-generating component is transferred to the coolant via the second surface 12. The cover 10 may be made of a material with relatively high thermal conductivity, such as copper or chromium copper. By forming the cover 10 using such a high thermal conductivity material, the heat from the heat-generating component can be efficiently transferred to the coolant.

[0018] The first elbow 20 is located on the first surface 11 and is connected to the first opening 13. The first elbow 20 changes the flow direction of the refrigerant flowing inside it. Specifically, the first elbow 20 changes the flow direction (XY plane direction) of the refrigerant flowing from the first flow pipe 40 to a direction toward the inside of the cover 10, more specifically, toward the first opening 13 (negative Z-axis direction). The first elbow 20 is formed, for example, in the shape of a rectangular parallelepiped, and is rectangular when viewed from a direction perpendicular to the first surface 11 (Z-axis direction). The first elbow 20 has a first corner portion 21 located close to the second flow pipe 50. The first corner portion 21 is the part of the first elbow 20 that is closest to the second flow pipe 50. In other words, the parts of the first elbow 20 other than the first corner portion 21 are located further away from the second flow pipe 50 than the first corner portion 21.

[0019] The second elbow 30 is located on the first surface 11 and is connected to the second opening 14. The second elbow 30 changes the flow path direction of the refrigerant flowing inside the second elbow 30. Specifically, the first elbow 20 changes the flow path direction (positive Z-axis direction) of the refrigerant flowing out from the internal space of the cover 10 through the second opening 14 to the flow path direction (XY plane direction) of the second flow path pipe 50. The second elbow 30 is, for example, formed in a rectangular parallelepiped shape and is rectangular when viewed from a direction orthogonal to the first surface 11. The second elbow 30 has a second corner portion 31 that is located close to the first flow path pipe 40. The second corner portion 31 is the portion of the second elbow 30 that is located closest to the first flow path pipe 40. In other words, the portions of the second elbow 30 other than the second corner portion 31 are located farther from the first flow path pipe 40 than the second corner portion 31.

[0020] The first elbow 20 and the second elbow 30 may be formed using, for example, stainless steel or chromium copper.

[0021] The first flow path pipe 40 connects, for example, the second coupling 82 and the first elbow 20. The first flow path pipe 40 is formed using, for example, copper. The first flow path pipe 40 is located on the first surface 11 and is connected to the first elbow 20. When viewed from a direction orthogonal to the first surface 11, the first flow path pipe 40 has a first straight portion 41 that linearly extends in a direction inclined with respect to the flow path direction A of the second elbow 30 at a position close to the second elbow 30. In other words, the flow path direction A of the second elbow 30, that is, the extending direction of the second elbow 30, is inclined with respect to the extending direction of the first straight portion 41 of the first flow path pipe 40. The angle B formed by the first straight portion 41 of the first flow path pipe 40 and the flow path direction A of the second elbow 30 may be an acute angle of, for example, 15 degrees or more.

[0022] Specifically, the first flow path pipe 40 has a first straight portion 41, a third bent portion 42, a second straight portion 43, and a fourth bent portion 44. The first straight portion 41 extends in a second direction (X-axis direction) orthogonal to the first direction (Y-axis direction) on the other side (positive Y-axis direction side) of the first direction of the first surface 11. The third bent portion 42 is connected to the other side (positive X-axis direction side) of the first straight portion 41 in the second direction and bends toward the one side (negative Y-axis direction side) of the first direction. The second straight portion 43 is connected to the one side (negative Y-axis direction side) of the third bent portion 42 in the first direction and linearly extends in the one side (negative Y-axis direction side) of the first direction. The fourth bent portion 44 is connected to the one side (negative Y-axis direction side) of the second straight portion 43 in the first direction and bends toward the one side (negative X-axis direction side) of the second direction.

[0023] The second flow path pipe 50 is located on the first surface 11 and connects the second elbow 30 and the third elbow 83 (see FIG. 3). The second flow path pipe 50 is formed using, for example, copper. The second flow path pipe 50 has a second bent portion 53 that bends in a direction away from the first elbow 20 at a position close to the first elbow 20.

[0024] Specifically, the second flow path pipe 50 has a third straight portion 51 that linearly extends from a position close to the first straight portion 41 of the first flow path pipe 40 toward the one side (negative Y-axis direction side) of the first direction and the one side (negative X-axis direction side) of the second direction. Note that "extending toward the first direction and the second direction" means, in other words, "extending obliquely with respect to the long side and the short side of the first surface 11".

[0025] The second flow path pipe 50 further has a first bent portion 52 and a second bent portion 53. The first bent portion 52 bends in a direction away from the first elbow 20 at a position close to the first elbow 20. Specifically, the first bent portion 52 extends in a curved shape that bulges inward when viewed from the first elbow 20 from a position close to the first corner portion 21 of the first elbow 20 toward the one side (negative Y-axis direction side) of the first direction and the other side (positive X-axis direction side) of the second direction.

[0026] The second bent portion 53 is connected to one side of the third straight portion 51 in the first direction (negative Y-axis direction) and has a bent shape that wraps around the first elbow 20 and approaches the first elbow 20 toward the other side in the second direction (positive X-axis direction). Specifically, the second bent portion 53 extends in a curved shape that bulges outward when viewed from the first elbow 20, from the end of the third straight portion 51 located on the other side in the first direction (positive Y-axis direction) and one side in the second direction (negative X-axis direction) relative to the first elbow 20 toward the end of the first bent portion 52 located on one side in the first direction (negative Y-axis direction) and one side in the second direction (negative X-axis direction) relative to the first elbow 20. The second bent portion 53 is continuous with the first bent portion 52 at a position close to the first elbow 20.

[0027] With the above configuration, a piping configuration is obtained in which coolant is drawn into the cover 10 from the other side in the first direction (positive Y-axis direction) and one side in the second direction (negative X-axis direction), while coolant flows into the interior of the cover 10 from one side in the first direction (negative Y-axis direction). This improves the piping workability of the flow channel when it is desired to cool the area on one side in the first direction (negative Y-axis direction) of the interior space of the cover 10 more than the area on the other side in the first direction (positive Y-axis direction).

[0028] Furthermore, by adopting the above configuration, it is possible to improve the piping workability of the flow path pipe when it is desired to discharge the refrigerant to the other side in the second direction (positive X-axis direction).

[0029] The first flow channel pipe 40 and the second flow channel pipe 50 may have the above-mentioned bent portions, specifically the first bent portion 52, the second bent portion 53, the third bent portion 42, and the fourth bent portion 44, at positions that overlap with the cover 10 when viewed from a direction perpendicular to the first surface 11.

[0030] This makes it easier to create piping that bends away from the elbow, or piping that extends linearly at an angle to the flow direction of the elbow. Furthermore, it facilitates piping even when there are constraints on external piping for the cooling device 100. It also improves the design flexibility of the external area of ​​the cooling device 100.

[0031] Furthermore, as described above, the second flow channel pipe 50 has a first bend 52 and a second bend 53. The first bend 52 bends away from the first elbow 20 at a position close to the first elbow 20. The second bend 53 has a bend shape that wraps around the first elbow 20 and approaches the first elbow 20, and is continuous with the first bend 52 at a position close to the first elbow 20.

[0032] Furthermore, it becomes easier to avoid the elbow of the second flow channel pipe 50. In addition, the first bend 52 and the second bend 53 cause slack in the flow channel pipe, which improves the ease of installation of the flow channel pipe.

[0033] In this embodiment, an example is shown where the second flow channel 50 has multiple bends, but the embodiment is not limited to this, and the first flow channel 40 may also have multiple bends. Furthermore, both the first flow channel 40 and the second flow channel 50 may have multiple bends. In other words, it is sufficient that at least one of the first flow channel 40 and the second flow channel 50 has multiple bends.

[0034] This makes it easier to create piping that bends away from the elbow, or piping that extends linearly at an angle to the flow direction of the elbow. Furthermore, it facilitates piping even when there are constraints on external piping for the cooling device 100. It also improves the design flexibility of the external area of ​​the cooling device 100.

[0035] The proximity distance between the first elbow 20 and the second flow pipe 50, and the proximity distance between the second elbow 30 and the first flow pipe 40, may be smaller than the diameters of the first flow pipe 40 and the second flow pipe 50. Specifically, the distance L1 between the first elbow 20 and the second flow pipe 50 at a position where they are close together may be smaller than the width L3 of the first flow pipe 40 (see Figure 2) and the width L4 of the second flow pipe 50. Also, the distance L2 between the second elbow 30 and the first flow pipe 40 at a position where they are close together (see Figure 2) may be smaller than the width L3 of the first flow pipe 40 and the width L4 of the second flow pipe 50.

[0036] In this configuration, the closest distance between the first elbow 20 and the second flow channel 50, and the closest distance between the second elbow 30 and the first flow channel 40, becomes smaller than the width L3 of the first flow channel 40 and the width L4 of the second flow channel 50. This improves the degree of freedom in arranging the first elbow 20 and the second elbow 30. It also improves the degree of freedom in designing the flow channels within the cooling device 100.

[0037] With the cooling device 100 configured as described above, the range in which the first flow channel pipe 40 and the second elbow 30 are in close proximity, and the range in which the second flow channel pipe 50 and the first elbow 20 are in close proximity can be reduced. This makes it possible to suppress deformation of the second flow channel pipe 50 adjacent to the first elbow 20 and deformation of the first flow channel pipe 40 adjacent to the second elbow 30 due to heat generated when the first elbow 20 and the second elbow 30 are joined by brazing or the like.

[0038] Furthermore, as described above, the first elbow 20 and the second elbow 30 are rectangular in shape when viewed from a direction perpendicular to the first surface 11. In the cooling device 100, the first elbow 20 and the second flow channel 50 are not arranged parallel to each other, and the second elbow 30 and the first flow channel 40 are not arranged parallel to each other, so the range in which the first elbow 20 and the second flow channel 50 are in close proximity, and the range in which the second elbow 30 and the first flow channel 40 are in close proximity can be reduced. This makes it possible to suppress deformation of the second flow channel 50 in close proximity to the first elbow 20 and deformation of the first flow channel 40 in close proximity to the second elbow 30 due to heat generated when the first elbow 20 and the second elbow 30 are joined by brazing or the like.

[0039] Furthermore, as described above, the first corner 21 of the first elbow 20 is positioned closest to the second flow pipe 50, and the second corner 31 of the second elbow 30 is positioned closest to the first flow pipe 40. This arrangement reduces the range in which the first flow pipe 40 and the second elbow 30 are in close proximity, and the range in which the second flow pipe 50 and the first elbow 20 are in close proximity. This makes it possible to suppress deformation of the second flow pipe 50 adjacent to the first elbow 20 and deformation of the first flow pipe 40 adjacent to the second elbow 30 due to heat generated when joining the first elbow 20 and the second elbow 30 by brazing or the like.

[0040] Furthermore, as described above, the angle B formed by the first straight section 41 of the first flow channel pipe 40 and the flow direction A of the second elbow 30 is an acute angle of 15 degrees or more. This configuration makes it possible to reduce the area in which the first flow channel pipe 40 and the second elbow 30 are in close proximity. This makes it possible to suppress deformation of the first flow channel pipe 40 in close proximity to the second elbow 30 due to heat generated when joining the second elbow 30 by brazing or the like.

[0041] <Cooling unit configuration> Next, with reference to Figure 3, an example of the configuration of the cooling unit 200 according to the embodiment will be described. As shown in Figure 3, the cooling unit 200 comprises the cooling device 100 described above, a first manifold 61, a second manifold 62, a third flow channel pipe 71, and a fourth flow channel pipe 72.

[0042] The cooling unit 200 comprises a plurality of cooling devices 100. In this embodiment, the cooling unit 200 comprises two cooling devices 100, but is not particularly limited, and may comprise three or more cooling devices 100. Each of the plurality of cooling devices 100 is in contact with a heat-generating component, which is a heat source, and absorbs heat from the heat-generating component. The piping of the first flow channel 40 and the second flow channel 50 of the cooling device 100 is symmetrical with respect to each other in the second direction. For example, the cooling device 100 on the other side of the second direction (positive X-axis side) is provided symmetrically with respect to the cooling device 100A on one side of the second direction (negative X-axis side), and the other side of the second direction (positive X-axis side) of the third flow channel 71 may be located between the cooling device 100A and the cooling device 100A when viewed from a direction perpendicular to the first surface 11. The first flow channel 40 and the second flow channel 50 of the cooling device 100 on the other side of the second direction (positive X-axis side) are symmetrical in the second direction with the first flow channel 40A and the second flow channel 50A of the cooling device 100A on one side of the second direction (negative X-axis side).

[0043] This further improves the ease of piping work for flow path pipes, especially when there are multiple heat sources.

[0044] The first manifold 61 connects, for example, the first coupling 81 to the second coupling 82 and the second coupling 82A. The first manifold 61 may be located on the other side of the first direction (positive Y-axis side) between the cooling device 100 and the cooling device 100A, as shown in Figure 3. In this configuration, one side of the first manifold 61 in the first direction (negative Y-axis side) is connected to the first coupling 81. Also, one side of the first manifold 61 in the first direction (negative Y-axis side) is connected to the second coupling 82 and the second coupling 82A on both sides of the first coupling 81 in the second direction (both sides in the X-axis direction), respectively. The first manifold 61 extends linearly in the second direction (X-axis direction) when viewed from a direction perpendicular to the first surface 11.

[0045] Alternatively, the first manifold 61 may be located between the cooling device 100 and the cooling device 100A (not shown). In this configuration, one side of the first manifold 61 in the first direction (negative Y-axis direction side) is connected to the first coupling 81. The other side of the first manifold 61 in the first direction (positive Y-axis direction side) is connected to the second coupling 82 and the second coupling 82A, respectively. The first manifold 61 extends linearly in the first direction when viewed from a direction perpendicular to the first surface 11.

[0046] The second manifold 62 connects, for example, the third elbow 83 and the third elbow 83A to the fourth elbow 84. The second manifold 62 is located on one side in the first direction (negative Y-axis direction) between the cooling device 100 and the cooling device 100A. One side in the first direction (negative Y-axis direction) of the upper surface of the second manifold 62 is connected to the fourth elbow 84. Furthermore, on the upper surface of the second manifold 62, the third elbow 83A is connected to the other side in the first direction (positive Y-axis direction) of the fourth elbow 84, and the third elbow 83 is connected to the other side in the first direction (positive Y-axis direction) and the other side in the second direction (positive X-axis direction) of the fourth elbow 84.

[0047] The first manifold 61 and the second manifold 62 may be formed from, for example, copper or chromium copper.

[0048] The third flow channel pipe 71 flows refrigerant supplied, for example, from a pump (not shown) to the first manifold 61. The other side of the third flow channel pipe 71 in the first direction (positive Y-axis direction) is connected to the first coupling 81. The one side of the third flow channel pipe 71 in the first direction (negative Y-axis direction) is connected to the third coupling 85. The inner diameter of the third flow channel pipe 71 may be larger than the inner diameters of the first flow channel pipe 40 and the second flow channel pipe 50. The outer shape of the third flow channel pipe 71 may be larger than the outer shape of the first flow channel pipe 40 and the second flow channel pipe 50.

[0049] The fourth flow channel pipe 72 carries, for example, the refrigerant supplied from the second manifold 62. The other side of the fourth flow channel pipe 72 in the first direction (positive Y-axis direction) is connected to the fourth elbow 84. The one side of the fourth flow channel pipe 72 in the first direction (negative Y-axis direction) is connected to the fourth coupling 86. The inner diameter of the fourth flow channel pipe 72 may be larger than the inner diameters of the first flow channel pipe 40 and the second flow channel pipe 50. The outer shape of the fourth flow channel pipe 72 may be larger than the outer shape of the first flow channel pipe 40 and the second flow channel pipe 50.

[0050] The third flow channel 71 and the fourth flow channel 72 may be formed from, for example, stainless steel.

[0051] The brazing process in the manufacturing of the cooling unit 200 is carried out in three stages. The heating temperature setting in each stage decreases in the order of the first, second, and third stages. This prevents the brazing from melting in the previous stage in the later stages.

[0052] In the first stage, the third flow channel pipe 71 and the first coupling 81 are brazed, and the fourth elbow 84 and the fourth flow channel pipe 72 are brazed.

[0053] In the second stage, the first coupling 81 is brazed to the first manifold 61, and the first manifold 61 is brazed to the second coupling 82 and the second coupling 82A. Also in the second stage, the first elbow 20 is brazed to the cover 10, the first elbow 20A is brazed to the cover 10A, the cover 10 is brazed to the second elbow 30, and the cover 10A is brazed to the second elbow 30A. Also in the second stage, the third elbow 83 and the third elbow 83A are brazed to the second manifold 62, and the second manifold 62 is brazed to the fourth elbow 84.

[0054] In the third stage, the third coupling 85 and the third flow tube 71 are brazed. Also in the third stage, the second coupling 82 and the first flow tube 40 are brazed, the second coupling 82A and the first flow tube 40A are brazed, the first flow tube 40 and the first elbow 20 are brazed, and the first flow tube 40A and the first elbow 20A are brazed. Also in the third stage, the second elbow 30 and the second flow tube 50 are brazed, the second elbow 30A and the second flow tube 50A are brazed, the second flow tube 50 and the third elbow 83 are brazed, and the second flow tube 50A and the third elbow 83A are brazed. Also in the third stage, the fourth flow tube 72 and the fourth coupling 86 are brazed.

[0055] Heating methods for the brazing process include vacuum brazing, diffusion bonding, heating in a continuous furnace, and heating with an induction heater.

[0056] Furthermore, this technology can also be configured as follows. (1) A cover having a first opening and a second opening on its first surface through which refrigerant flows, A first elbow located on the first surface and connected to the first opening, A second elbow located on the first surface and connected to the second opening, A first flow channel pipe located on the first surface and connected to the first elbow, A second flow channel pipe located on the first surface and connected to the second elbow, Equipped with, A cooling device in which, when viewed from a direction perpendicular to the first surface, the first flow channel extends linearly in a direction inclined with respect to the flow direction of the second elbow at a position close to the second elbow, or the second flow channel bends in a direction away from the first elbow at a position close to the first elbow. (2) The cooling device according to (1), wherein the first elbow and the second elbow are rectangular when viewed from a direction perpendicular to the first surface. (3) The cooling device according to (1) or (2), wherein the first flow channel tube and the second flow channel tube have bent portions at positions that overlap with the cover when viewed from a direction perpendicular to the first surface. (4) The cooling device according to (3), wherein at least one of the first flow channel tube and the second flow channel tube has a plurality of bent portions. (5) The second flow channel tube is, A first bent portion that bends away from the first elbow at a position adjacent to the first elbow, It has a bent shape that wraps around the first elbow and approaches the first elbow, and a second bent portion that is continuous with the first bent portion at a position close to the first elbow. A cooling device according to any one of (1) to (4), having the following: (6) The cooling device according to any one of (1) to (5), wherein the distance between the first elbow and the second flow channel at a position where the first elbow and the second flow channel are in close proximity, and the distance between the second elbow and the first flow channel at a position where the second elbow and the first flow channel are in close proximity, are smaller than the widths of the first and second flow channel pipes. (7) The first elbow has a first corner located in close proximity to the second flow channel, The second elbow has a second corner located in close proximity to the first flow channel pipe, The first corner of the first elbow is located closest to the second flow channel, The cooling device according to any one of (2) to (6), wherein the second corner of the second elbow is located closest to the first flow channel. (8) The cooling device according to any one of (1) to (7), wherein the angle between the portion of the first flow channel pipe that extends linearly in a direction inclined with respect to the flow direction of the second elbow at a position adjacent to the second elbow and the flow direction of the second elbow is an acute angle of 15 degrees or more. (9) The first flow channel tube is, On the other side of the first surface in the first direction, there is a first straight section extending in a second direction perpendicular to the first direction, A third bent portion is connected to the other side of the first straight portion in the second direction and bends toward one side in the first direction, A second straight section is connected to one side of the third bent section in the first direction and extends linearly in the same direction, It has a fourth bent portion connected to one side in the first direction of the second straight portion and bending to one side in the second direction, The second flow channel tube is, The cooling device according to any one of (1) to (8), having a third linear section extending linearly from a position adjacent to the first linear section toward one side in the first direction and one side in the second direction. (10) The second flow channel tube is, A first bent portion that bends away from the first elbow at a position adjacent to the first elbow, The cooling device according to (9), further comprising: a third straight section connected to one side in the first direction, having a bent shape that wraps around the first elbow and approaches the first elbow toward the other side in the second direction, and a second bent section that is continuous with the first bent section at a position close to the first elbow. (11) The system includes multiple cooling devices as described in any one of (1) to (10), The cooling device is a cooling unit in which the piping of the first flow channel and the second flow channel are symmetrical with respect to each other in a second direction.

[0057] The embodiments disclosed herein should be considered in all respects as illustrative and not restrictive. Indeed, the above embodiments can be embodied in a variety of forms. Furthermore, the above embodiments may be omitted, replaced, or modified in various ways without departing from the scope and spirit of the appended claims. [Explanation of Symbols]

[0058] 10 Covers 11 Page 1 13. First opening 14. Second opening 20 First Elbow 21 1st corner 30 Second Elbow 31 Second corner 40. First flow channel tube 41 1st straight section 42 3rd bending part 43 2nd straight section 44 4th bending part 50 Second flow channel 51 3rd straight section 52 1st bending part 53 2nd bending part 100 Cooling device 200 Cooling Units A Flow direction B angle L1 distance L2 distance L3 width L4 width

Claims

1. A cover having a first opening and a second opening on its first surface through which refrigerant flows, A first elbow located on the first surface and connected to the first opening, A second elbow located on the first surface and connected to the second opening, A first flow channel pipe located on the first surface and connected to the first elbow, A second flow channel pipe located on the first surface and connected to the second elbow, Equipped with, A cooling device in which, when viewed from a direction perpendicular to the first surface, the first flow channel extends linearly in a direction inclined with respect to the flow direction of the second elbow at a position close to the second elbow, or the second flow channel bends in a direction away from the first elbow at a position close to the first elbow.

2. The cooling device according to claim 1, wherein the first elbow and the second elbow are rectangular when viewed from a direction perpendicular to the first surface.

3. The cooling device according to claim 1, wherein the first flow channel tube and the second flow channel tube have bent portions at positions that overlap with the cover when viewed from a direction perpendicular to the first surface.

4. The cooling device according to claim 3, wherein at least one of the first flow channel tube and the second flow channel tube has a plurality of bent portions.

5. The second flow channel tube is A first bent portion that bends away from the first elbow at a position close to the first elbow, It has a bent shape that wraps around the first elbow and approaches the first elbow, and a second bent portion that is continuous with the first bent portion at a position close to the first elbow. A cooling device according to claim 1, having the following features.

6. The cooling device according to claim 1, wherein the distance between the first elbow and the second flow channel at a position where the first elbow and the second flow channel are in close proximity, and the distance between the second elbow and the first flow channel at a position where the second elbow and the first flow channel are in close proximity, are smaller than the widths of the first flow channel and the second flow channel.

7. The first elbow has a first corner located in close proximity to the second flow channel, The second elbow has a second corner located in close proximity to the first flow channel pipe, The first corner of the first elbow is located closest to the second flow channel, The cooling device according to claim 2, wherein the second corner of the second elbow is located closest to the first flow channel pipe.

8. The cooling device according to claim 1, wherein the angle between the portion of the first flow channel pipe that extends linearly in a direction inclined with respect to the flow channel direction of the second elbow at a position adjacent to the second elbow and the flow channel direction of the second elbow is an acute angle of 15 degrees or more.

9. The first flow channel tube is, On the other side of the first surface in the first direction, there is a first straight section extending in a second direction perpendicular to the first direction, A third bent portion is connected to the other side of the first straight portion in the second direction and bends toward one side in the first direction, A second straight section is connected to one side of the third bent section in the first direction and extends linearly in the same direction, It has a fourth bent portion connected to one side in the first direction of the second straight portion and bending to one side in the second direction, The second flow channel tube is The cooling device according to claim 1, further comprising a third linear portion extending linearly from a position adjacent to the first linear portion toward one side in the first direction and one side in the second direction.

10. The second flow channel tube is A first bent portion that bends away from the first elbow at a position close to the first elbow, The cooling device according to claim 9, further comprising a third straight section connected to one side in the first direction, having a bent shape that wraps around the first elbow and approaches the first elbow toward the other side in the second direction, and a second bent section that is continuous with the first bent section at a position close to the first elbow.

11. A plurality of cooling devices according to claim 9 or claim 10 are provided, The cooling device is a cooling unit in which the piping of the first flow channel and the second flow channel are symmetrical with respect to each other in a second direction.

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