Cooler and cooling system

Abstract

The cooler and the cooling system can effectively cool heat generated by a heating body. A cooler (1) is a cooler for cooling a heat-generating body (2). A cooler (1) is provided with: a housing (20) having a heating element (2) on the outer surface thereof and having an inner space in which a refrigerant flows; and a fin (11) protruding from the inner surface of the housing (20), the inner space of the fin (11) forming a refrigerant flow path. The fin (11) has: a plurality of columnar sections (12) arranged in a staggered shape; a plurality of plate-shaped sections (13) that connect the columnar sections (12) adjacent to each other in a flow direction (F) in which the refrigerant flows, the columnar sections (12) being orthogonal to the height direction (H) of the housing; and a plurality of inclined connection sections (14) that connect the columnar sections (12) adjacent to each other in an inclined direction that obliquely intersects the flow direction (F). A cooling system (30) is provided with a cooler (1), a heat exchanger (40), a pump (50), and a pipe (60) connecting the cooler (1), the heat exchanger (40), and the pump (50).

Description

Technical Field

[0001] The present disclosure relates to a cooler and a cooling system. Background Art

[0002] In order to drive the motors in electric vehicles, switching power supplies, inverters, converters and other power conversion devices including semiconductor elements such as MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) and IGBT (Insulated Gate Bipolar Transistor) are required. Such power conversion devices handle large currents and generate heat to high temperatures. Therefore, liquid-cooled coolers are generally used to cool them.

[0003] This cooler (hereinafter referred to as the conventional cooler) is formed in a box shape, and a coolant flows inside it. In addition, a power conversion device is installed on the outer side surface of a plate (hereinafter referred to as a heat sink) constituting the cooler box. As a result, the heat from the power conversion device is transferred to the coolant flowing in the cooler via the heat sink, and the power conversion device is cooled. Moreover, on the inner side surface of the heat sink, that is, the surface in contact with the coolant, in order to improve its cooling efficiency, pin-shaped fins are provided at intervals as shown in Patent Document 1. Prior art literature Patent Literature

[0004] Patent Document 1: International Publication No. 2012 / 157247 Summary of the invention Technical problem to be solved by the invention

[0005] In existing coolers, pin-shaped fins are mostly used. Since the pin-shaped fins are arranged at intervals, the flow velocity between the fins will be distributed, and the surface area of ​​the pin-shaped fins cannot be effectively utilized, and the heat transfer rate becomes small. In addition, due to the effect of peeling, the flow velocity distribution of the pin-shaped fins increases, resulting in a further decrease in thermal conductivity. Therefore, the existing cooler has a technical problem of poor cooling efficiency.

[0006] The present disclosure is made to solve the above-mentioned problems, and an object of the present disclosure is to provide a cooler and a cooling system that effectively cool the heat generated from a heat generating element. Technical solutions to technical problems

[0007] The cooler involved in the present disclosure is a cooler for cooling a heat-generating body, comprising: a shell, the outer surface of which is provided with a heat-generating body, and the inside of which has an internal space for refrigerant to flow; and fins, which protrude from the inner surface of the shell and form a refrigerant flow path in the internal space, and the fins have: a plurality of columnar portions, which are arranged in a staggered manner; a plurality of plate-like portions, which connect the columnar portions adjacent to each other in the flow direction that is orthogonal to the height direction of the shell and for the flow of the refrigerant; and a plurality of inclined connecting portions, which connect the columnar portions adjacent to each other in an inclined direction that is inclined and intersecting with respect to the flow direction.

[0008] The cooling system involved in the present disclosure is a cooling circuit for the flow of refrigerant, including: the cooler involved in the present disclosure; a heat exchanger that cools the refrigerant; a pump that transports the refrigerant to the cooler; and a pipe that connects the cooler, the heat exchanger and the pump. Effects of the Invention

[0009] According to the present disclosure, heat generated by a heat generating element can be effectively cooled. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a perspective view of the cooler according to the first embodiment. Figure 2 This is a schematic configuration diagram of the cooler according to the first embodiment. Figure 3 yes Figure 1 Cross-sectional view of section AA. Figure 4 This is a plan view of the main surface of the heat sink according to the first embodiment as viewed from a direction perpendicular to the main surface. Figure 5 yes Figure 4 Cross-sectional view of the BB section. Figure 6 yes Figure 4 Cross-sectional view of the CC section. Figure 7 This is a schematic diagram of the fin arrangement according to the first embodiment. Figure 8 It is a top view of a heat sink plate serving as a comparison object of the first embodiment. Fig. 9 This is a schematic configuration diagram of a cooler according to the second embodiment. Fig.10 This is a configuration diagram of a cooling system according to the third embodiment. DETAILED DESCRIPTION

[0011] Hereinafter, the embodiments of the present disclosure will be described with reference to the accompanying drawings. In each of the drawings, the structures marked with the same reference numerals are the same or equivalent structures, which are common throughout the entire text of the specification. In addition, the structural elements shown in the entire text of the specification are only illustrative and are not limited to these records.

[0012] Implementation method 1. Figure 1 This is a perspective view of the cooler according to the first embodiment. Figure 2 This is a schematic configuration diagram of the cooler according to the first embodiment. Figure 3 yes Figure 1 In the figure, the height direction H indicated by the H axis is a direction perpendicular to the plane formed by the main surface S1 of the heat sink 10 described later, and the flow direction F indicated by the F axis is the direction in which the refrigerant flows in the shell 20 of the cooler 1. In addition, the width direction W indicated by the W axis is a direction perpendicular to the height direction H and the flow direction F.

[0013] The cooler 1 cools a heat generating body 2. The heat generating body 2 is, for example, a power conversion device. The cooler 1 can be divided into four parts: a heat sink 10, a housing 20, a refrigerant inlet 22, and a refrigerant outlet 24.

[0014] The housing 20 is a box-shaped member having a heat sink 10 provided with a heating element 2 on the outer surface. The housing 20 has an internal space 21 for the refrigerant flowing in from a refrigerant inlet 22. The housing 20 is formed of a material such as aluminum. In addition, the heat sink 10 is shown separately from the housing 20, but the heat sink 10 is a member constituting the housing 20.

[0015] The refrigerant inlet 22 is a tubular member made of aluminum or the like. Figure 2 As shown, one end of a pipe formed by the refrigerant inlet 22 is connected to an inlet 23 opened on one surface of a box constituting the shell 20. In addition, the refrigerant flows in from the other end of the refrigerant inlet 22, so that the refrigerant flows into the shell 20.

[0016] The refrigerant outlet 24 is also a tubular member made of aluminum or the like, similarly to the refrigerant inlet 22. Figure 2 As shown, one end of the pipe formed by the refrigerant outlet portion 24 is connected to an outflow port 25 opened on a surface of the box constituting the shell 20, on a surface opposite to the surface connected to the refrigerant inlet portion 22. The refrigerant flowing inside the shell 20 flows out to the outside of the shell 20 via the outflow port 25 and the refrigerant outlet portion 24. The refrigerant flows from the inflow port 23 to the outflow port 25 inside the shell 20.

[0017] The heat sink 10 is a rectangular flat plate made of copper, aluminum, etc. Figure 3As shown, the heating element 2 is mounted on the upper surface of the heat sink 10, which is one of the outer surfaces (external surfaces) of the housing 20. In addition, the lower surface of the heat sink 10, which is the surface opposite to the upper surface, is referred to as the main surface S1. The main surface S1 constitutes an inner side surface (inner surface) of the housing 20 and contacts the refrigerant.

[0018] Figure 4 This is a plan view of the main surface S of the heat sink 10 according to the first embodiment as viewed from a direction perpendicular to the main surface S1. Figure 5 yes Figure 4 Cross-sectional view of the BB section. Figure 6 yes Figure 4 Cross-sectional view of the CC section.

[0019] The heat sink 10 is provided with fins 11. The fins 11 protrude from the main surface S1 of the heat sink and form a refrigerant flow path in the internal space 21 of the housing 20. The fins 11 have a plurality of columnar portions 12, a plurality of plate portions 13, and a plurality of inclined connection portions 14.

[0020] like Figure 4 As shown, the columnar portions 12 are arranged in a staggered manner on the main surface S1 when viewed from the height direction H. A plurality of columnar portions 12 are arranged at equal intervals in the flow direction F, which is the flow direction of the refrigerant, to form a row. This row is called a fin row. A plurality of fin rows are provided in the width direction W. The fin rows are arranged in a staggered manner in the width direction W. Each fin row is arranged in a staggered manner in the flow direction F every other row in the width direction W. Thus, the columnar portions 12 are arranged in a staggered manner on the heat sink 10.

[0021] The shape of the columnar portion 12 is, for example, a hexagon. Figure 4 In the example shown, the columnar portion 12 has a surface parallel to the plate-like portion 13 described later. In addition, the columnar portion 12 preferably has a shape in which the longitudinal width a (width in the flow direction F) of the columnar portion 12 and the lateral width b (width in the width direction W) of the columnar portion 12 satisfy a / b>1. That is, the columnar portion 12 preferably has a shape in which the longitudinal width a is greater than the lateral width b.

[0022] The columnar portion 12 is a solid member made of aluminum and extends in a height direction H perpendicular to the plane formed by the main surface S1. The height direction H also refers to the height direction of the housing 20 and the fins. Figure 5 As shown, in the cross section perpendicular to the flow direction F, the length of the height direction H of the columnar portion 12 (hereinafter referred to as the height) is the same as the length of the bottom surface of the connecting shell 20 and the main surface S1 of the heat sink 10. That is, the height of the columnar portion 12 is equal to the height of the refrigerant flow path.

[0023] In addition, if Figure 4As shown, a plate-like portion 13 is provided on the inner surface of the shell 20, and the plate-like portion 13 connects the columnar portions 12 adjacent to each other in the flow direction F which is orthogonal to the height direction H of the shell and for the refrigerant to flow. The plate-like portion 13 is a rectangular flat plate made of aluminum. The flat plate is parallel to the height direction H and parallel to the flow direction F.

[0024] One end of the plate-like portion 13 in the flow direction F is arranged to contact the columnar portion 12 on the inlet 23 side in the flow direction F, and the other end of the plate-like portion 13 is arranged to contact the columnar portion 12 on the outlet 25 side in the flow direction F. That is, the plate-like portion 13 connects the columnar portions 12 adjacent to each other in the flow direction F.

[0025] like Figure 5 As shown, the height of the plate-like portion 13 is the same as the height of the columnar portion 12. The length d of the plate-like portion 13 in the width direction W (hereinafter referred to as the width) is smaller than the length c of the columnar portion 12 in the width direction W (hereinafter referred to as the width). That is, the relationship between the width c of the columnar portion 12 and the width d of the plate-like portion 13 satisfies c / d>1.

[0026] In addition, if Figure 4 As shown, an inclined connection portion 14 is provided on the inner surface of the shell 20, and the inclined connection portion 14 connects the adjacent columnar portions 12 in a direction obliquely intersecting with respect to the flow direction F of the refrigerant. The inclined connection portion 14 is inclined with respect to the flow direction F and the width direction W. The inclined connection portion 14 connects the corners of the columnar portion 12 which are polygonal to each other. Here, the corner of the columnar portion 12 refers to a corner formed by connecting the side surface parallel to the plate-shaped portion 13 and the side surface not parallel to the plate-shaped portion 13 among the six corners of the columnar portion when the columnar portion 12 is a hexagon. In addition, the corner portion includes not only the corner portion but also a part of the side surface adjacent to the corner portion. In addition, the side surface is a surface in contact with the refrigerant. In addition, as Figure 6 As shown, the height of the inclined connection portion 14 is lower than the height of the columnar portion 12 and the height of the plate-shaped portion 13. The inclined connection portion 14 is extended from the heat sink 10 to the bottom of the housing 20.

[0027] Figure 7 Schematic diagram of the fin arrangement according to Embodiment 1. Figure 7 The inclined connection portion 14 is described in more detail. Figure 7 Flows from the lower side of the paper to the upper side of the paper.

[0028] like Figure 7As shown, in the fin rows arranged in sequence along the width direction W, the plurality of columnar portions 12 constituting any one of the fin rows are set as columnar portions 12a and 12aa toward the flow direction F. In addition, in the width direction W, the plurality of columnar portions 12 constituting the fin row adjacent to the fin row including the columnar portions 12a and 12aa are respectively set as columnar portions 12b and 12bb. In addition, the plurality of columnar portions 12 constituting the fin row adjacent to the fin row including the columnar portions 12b and 12bb are respectively set as columnar portions 12c and 12cc.

[0029] The columnar portion 12b is connected to the columnar portion 12aa adjacent in the oblique direction obliquely intersecting the flow direction F through the oblique connection portion 14aab. The columnar portion 12b is connected to the columnar portion 12cc adjacent in the oblique direction obliquely intersecting the flow direction F through the oblique connection portion 14bcc. That is, the columnar portion 12b is connected to the obliquely front columnar portion 12aa through the oblique connection portion 14aab on the downstream side, and is connected to the obliquely front columnar portion 12cc through the oblique connection portion 14aab.

[0030] In addition, the columnar portion 12b is located on the upstream side of the columnar portion 12b, and is connected to the columnar portion 12a located obliquely rearward relative to the flow direction F through the inclined connection portion 14ab. The columnar portion 12b is located on the upstream side of the columnar portion 12b, and is connected to the columnar portion 12c located obliquely rearward relative to the flow direction F through the inclined connection portion 14bc. That is, the inclined connection portion 14 connects the columnar portions 12 that are closest to each other in the fin rows adjacent to the width direction W.

[0031] The distance of the inclined connection portion 14 (the distance between the columnar portions 12 closest to each other in the fin rows adjacent to each other in the width direction W) is longer than the distance between the columnar portions 12 and the plate-like portions 13 adjacent to each other in the width direction W. In other words, the length of the inclined connection portion 14 is longer than the distance between the columnar portions 12 and the plate-like portions 13 that are closest to each other.

[0032] Next, the flow of the refrigerant of the cooler 1 involved in this embodiment is described. The refrigerant is supplied from the refrigerant inlet portion 22, and the refrigerant flows into the internal space 21 of the shell from the inlet 23. The inflowing refrigerant flows toward the outflow 25 in the refrigerant flow path formed by the columnar portion 12, the plate-shaped portion 13, the inclined connecting portion 14, the main surface S1 of the heat sink 10, and the inner surface of the shell 20. In the refrigerant flow path, the refrigerant contacts the fins 11 and the main surface S1 of the heat sink 10, thereby cooling the heating element 2. The refrigerant reaching the outflow 25 flows out from the refrigerant outlet portion 24 to the outside of the shell 20.

[0033] The cooler 1 is provided, for example, in a circulation path of a refrigerant of a cooling system 30 described later. In this case, the other end of the refrigerant inlet 22 is connected to the pipe 60, and the refrigerant passing through the pipe 60 flows into the shell 20. The other end of the refrigerant outlet 24 is connected to the pipe 60. Thus, the refrigerant passing through the shell 20 flows out from the refrigerant outlet 24 to the pipe 70.

[0034] Here, as a comparative example, cooling in the case where a plurality of cylindrical pin fins are arranged on a heat sink will be described. Figure 8 It is a top view of the heat sink 100 which is a comparison object of Embodiment 1.

[0035] In the heat sink 100, the refrigerant that collides with the pin fin 12d passes through the gap M of the pin fin 12e located on the upstream side relative to the pin fin 12d and the gap N of the pin fin 12f adjacent to the pin fin 12d in the width direction W orthogonal to the flow direction F, and collides with the pin fin 12g located on the downstream side relative to the pin fin 12d. At this time, since the gap N is wider than the gap M, the flow rate of the refrigerant is slowed in the gap N. As a result, the cooling efficiency near the gap N is deteriorated. In addition, near the corner of the pin fin, especially in the rear part (upstream side), due to the effect of peeling, the refrigerant is difficult to flow, and the cooling efficiency is deteriorated.

[0036] On the other hand, the cooler 1 involved in the present embodiment 1 is a cooler for cooling the heat generating element 2, and includes: a shell 20, the outer surface of which is provided with the heat generating element 2, and the inside of which has an internal space 21 for the refrigerant to flow; and fins 11, which protrude from the inner surface (main surface S1) of the shell and form a refrigerant flow path in the internal space 21, and the fins 11 have: a plurality of columnar portions 12, which are arranged in a staggered manner; a plurality of plate-like portions 13, which connect the columnar portions 12 adjacent to each other in the flow direction F which is orthogonal to the height direction H of the shell and for the refrigerant to flow; and a plurality of inclined connecting portions 14, which connect the columnar portions 12 adjacent to each other in an inclined direction which is obliquely intersecting with respect to the flow direction F. By having this structure, the cooler 1 involved in the present embodiment 1 can efficiently cool the heat generated from the heat generating element 2.

[0037] Specifically, the plate-like portion 13 is located at the center of the gap N in the width direction W. As a result, the width of the flow path at the gap N is narrower than when there is no plate-like portion 13. As a result, the decrease in the flow velocity of the refrigerant in the gap N can be suppressed, and the deterioration of the cooling efficiency can be suppressed. Therefore, the decrease in thermal conductivity caused by the flow velocity distribution can be suppressed, and the cooler 1 can effectively cool the heat generated from the heat generating element 2.

[0038] In addition, by providing the inclined connection portion 14, the turbulence of the refrigerant can be promoted, so that cooling can be more effectively achieved. The inclined connection portion 14 connects the columnar portions 12 that are adjacent in the inclined direction relative to the flow direction F of the refrigerant among the plurality of columnar portions 12 arranged in a staggered manner. That is, by providing the inclined connection portion 14 near the corner of the columnar portion 12 where peeling is easily generated, the refrigerant collides with the inclined connection portion 14 and is stirred, thereby promoting the turbulence of the refrigerant. By turbulence, the stagnation (dead water area) of the refrigerant caused by peeling can be suppressed, so that the flow velocity distribution between the fins can be reduced. In addition, by turbulence, the dead water area generated near the corner of the columnar portion 12 can be suppressed, so that the surface area of ​​the columnar portion 12 can be effectively and flexibly utilized. In summary, the reduction in heat transfer coefficient can be suppressed, and the heat generating element 2 can be efficiently cooled. In addition, since the refrigerant collides with the inclined connection portion 14 obliquely, the pressure loss can also be reduced.

[0039] In addition, since the plate-like portion 13 and the inclined connection portion 14 are provided on the main surface S1 of the heat sink 10 (the inner surface of the housing 20), the surface area in contact with the refrigerant is larger than that of a heat sink not provided with the plate-like portion 13 and the inclined connection portion 14. Therefore, the cooler 1 having the heat sink 10 has a higher ability to cool the heating element 2 than the conventional cooler having the heat sink 100 not provided with the plate-like portion 13 and the inclined connection portion 14. Moreover, by connecting the columnar portion 12, the plate-like portion 13 and the inclined connection portion 14, the seismic strength is also improved, and the effect of suppressing vibration can also be expected.

[0040] In addition, the length of the inclined connection portion 14 is longer than the distance between the columnar portion 12 and the plate-like portion 13 that is closest to each other. Compared with connecting the columnar portion 12 and the plate-like portion 13 that is adjacent in the width direction W, the inclined connection portion 14 connects the columnar portions 12 that are closest to each other in the fin rows that are adjacent in the width direction W, thereby increasing the contact area with the refrigerant to improve the cooling performance.

[0041] In addition, the columnar portions 12 are arranged in a staggered manner on the main surface S1 of the heat sink 10 when viewed from the height direction H. As a result, the refrigerant flowing in the cooler 1 collides with the columnar portions 12 from a direction parallel to the flow direction F, and the development of the temperature boundary layer around the columnar portions 12 is suppressed by the leading edge effect. As a result, in the cooler 1, the heat generated from the heat generating element 2 can be effectively cooled.

[0042] Moreover, the columnar portion 12 is hexagonal. Here, it is assumed that the columnar portion 12 is cylindrical. In this case, the flow of the refrigerant near the surface of the columnar portion 12 is not easily disturbed. On the other hand, when the columnar portion 12 is hexagonal as in the present embodiment 1, the flow disturbance (turbulence) of the refrigerant can be promoted. Furthermore, by making the longitudinal width a of the columnar portion 12 and the lateral width b of the columnar portion 12 satisfy a / b>1, the contact area between the refrigerant and the columnar portion 12 can be increased, thereby improving the cooling performance.

[0043] The height of the columnar portion 12 and the height of the plate-like portion 13 are the same as the height of the refrigerant flow path. Therefore, the surface area of ​​the fin 11 in contact with the refrigerant increases, so that the heat generating element 2 can be cooled more effectively.

[0044] The height of the inclined connection portion 14 is lower than the height of the columnar portion 12 and the height of the plate-like portion 13. This structure can increase the contact area between the heat sink 10 and the refrigerant and promote turbulence of the refrigerant. Therefore, the heat generating element 2 can be cooled more effectively.

[0045] In addition, the width d of the plate-like portion 13 is smaller than the width c of the columnar portion 12. That is, the relationship c / d>1 is satisfied. With this structure, the contact area between the columnar portion 12 and the plate-like portion 13 and the refrigerant can be increased, and the leading edge effect of the columnar portion 12 can be improved, so that the heating element 2 can be cooled more effectively.

[0046] Furthermore, in the heat sink 10 of the cooler 1, aluminum is used as the material of the columnar portion 12, and copper is used as the material of the plate-like portion 13. For example, when the thickness of the flat plate formed by the plate-like portion 13 is thinner than the width of the hexagon formed by the columnar portion 12, the cooling performance of the plate-like portion 13 sometimes deteriorates relative to the columnar portion 12. However, by using copper having a better thermal conductivity than aluminum as the material of the plate-like portion 13, the deterioration of the cooling performance of the plate-like portion 13 can be suppressed. In addition, when different materials are used for the material of the columnar portion 12 and the material of the plate-like portion 13, in the manufacturing process, there is a method of forming the columnar portion 12 on the heat sink 10 and then pressing the plate-like portion 13 in, or a method of welding the plate-like portion 13 to the columnar portion 12 by brazing or the like.

[0047] The heights of the columnar portion 12 and the plate-like portion 13 are the same as the height of the refrigerant flow path, but may be shorter than the height of the refrigerant flow path according to the warping of the heat sink 10 as long as they are longer than the height of the inclined connection portion 14 .

[0048] In addition, the power conversion device as an example of the heating element 2 is a converter / inverter and a regulator for controlling the motor 80 described later, including semiconductor elements such as MOSFET and IGBT, reactors, capacitors, etc. In addition, the semiconductor elements and the like contained in the power conversion device are mounted on an insulating substrate inside the power conversion device. Moreover, when the motor 80 is working, in order to control the motor 80, current flows through the power conversion device, and the temperature of the semiconductor elements and the like contained in the power conversion device becomes high.

[0049] Implementation method 2. use Fig. 9 Cooler 1A according to Embodiment 2 is described. Cooler 1A according to Embodiment 2 differs from cooler 1 according to Embodiment 1 in the shape of inclined connection portion 14. Description of the same configuration as Embodiment 1 is omitted, and the same or corresponding portions as those in Embodiment 1 are denoted by the same reference numerals.

[0050] Fig. 9 This is a plan view of a main surface S1 of a heat sink 10A according to the second embodiment as viewed from a direction perpendicular to the main surface S1.

[0051] In the heat sink 10A involved in the cooler 1A of the second embodiment, a plurality of concave-convex portions G are formed on the side surface of the inclined connection portion 14, that is, on the surface in contact with the refrigerant. The concave-convex portion G is a groove whose cross section forms a V-shape and extends along the height direction H. As a result, the heat sink 10A has a larger area in contact with the refrigerant than the heat sink 10. As a result, the cooler 1A can not only have the effect of the first embodiment, but also can effectively cool the heat generated from the heating element 2. In addition, the other structures of the cooler 1A are the same as those of the cooler 1.

[0052] Implementation method 3. use Fig.10 A cooling system 30 according to Embodiment 3 will be described. The cooling system 30 according to Embodiment 3 is a cooling system 30 including the cooler described in Embodiment 1 or Embodiment 2. Description of the same configuration as that of Embodiment 1 will be omitted, and the same or corresponding parts as those of Embodiment 1 are denoted by the same reference numerals.

[0053] Fig.10 1 is a block diagram showing the structure of a cooling system 30 according to Embodiment 3. The cooling system 30 includes the cooler 1 or 1A described in Embodiment 1 or 2, a heat exchanger 40, a pump 50, and a pipe 60 connecting the components.

[0054] The cooling system 30 is a cooling circuit that uses a refrigerant to cool the heat generating element 2. In the third embodiment, the heat generating element 2 is a power conversion device.

[0055] The refrigerant flowing in the cooling system 30 circulates in the cooling circuit in the order of the heat exchanger 40, the pump 50, and the cooler 1 provided with the heating element 2. The cooler 1 (1A), the heat exchanger 40, and the pump are connected by the pipes 60, respectively. Therefore, in the cooling circuit, the refrigerant cooled by the heat exchanger 40 is transported to the cooler 1 (1A) by the pump 50. The refrigerant flows into the cooler 1, performs heat exchange, and thereby cools the heating element 2. The heated refrigerant flows into the heat exchanger 40 again and is cooled by the heat exchanger 40.

[0056] The refrigerant flowing in the cooling circuit is an antifreeze solution (LLC) in which additives serving as a rust inhibitor, corrosion inhibitor, and defoaming agent are mixed in an ethylene glycol aqueous solution.

[0057] In summary, the cooling system 30 according to the present embodiment is a cooling circuit in which a refrigerant flows. By having the cooler 1 (1A) described in embodiment 1 or embodiment 2, the heat exchanger 40 for cooling the refrigerant, the pump 50 for transporting the refrigerant to the cooler 1 (1A), and the piping 60 connecting the cooler 1 (1A), the heat exchanger 40 and the pump 50, the heat generating element 2 can be efficiently cooled.

[0058] In addition, appropriate combination, deformation or omission of each embodiment is also included in the scope of the technical idea shown in the embodiment. For example, the refrigerant in the above embodiment is antifreeze, but it can also be replaced by cooled gas. In addition, the concave-convex part G formed on the side of the inclined connection part 14 can be provided with not only a V-shaped groove, but also a semicircular concave part, etc. Description of symbols

[0059] 1. 1A Cooler 2 Heating element (power conversion device) 10, 10A heat sink 11 Fins 12, 12a, 12aa, 12b, 12bb, 12c, 12cc columnar part 13 plate-shaped part 14, 14aab, 14bcc, 14ab, 14bc inclined connection 20 Shell 21. Interior Space 22 Refrigerant inlet 23 Inlet 24 Refrigerant outlet 25 Outlet 30 Cooling system 40 Heat exchanger 50 Pumps 60 piping 100 Heat sink F Flow direction G Concave and convex part H Height direction S1 Main side W Width direction.

Claims

1. A cooler for cooling a heating element, characterized in that: include: A shell, the outer surface of which is provided with the heating element, and the inside of which has an internal space for the refrigerant to flow; as well as fins protruding from the inner surface of the shell and forming a refrigerant flow path in the inner space, The fin has: A plurality of columnar portions, the plurality of columnar portions are arranged in a staggered manner; a plurality of plate-like portions that connect the columnar portions that are orthogonal to the height direction of the shell and that are adjacent to each other in the flow direction in which the refrigerant flows; and A plurality of inclined connecting parts connect the columnar parts adjacent to each other in an inclined direction obliquely intersecting with the flow direction.

2. The cooler according to claim 1, characterized in that The plurality of columnar portions are arranged at intervals in the flow direction to form a fin row, The plurality of fin rows are provided at intervals in a width direction perpendicular to the height direction and the flow direction, and the fin rows are arranged in the width direction so as to be staggered in the flow direction with every other row.

3. The cooler according to claim 2, characterized in that The inclined connection portion connects the columnar portions that are closest to each other among the columnar portions that are adjacent in the width direction and form the fin row.

4. The cooler according to any one of claims 1 to 3, characterized in that The height of the columnar portion and the height of the plate-shaped portion are the same as the height of the refrigerant flow path.

5. The cooler according to any one of claims 1 to 4, characterized in that The height of the inclined connection portion is lower than the height of the columnar portion and the height of the plate-shaped portion.

6. The cooler according to any one of claims 1 to 5, characterized in that The columnar portion has a polygonal shape, and the inclined connection portion connects corners of the columnar portion.

7. The cooler according to any one of claims 1 to 6, characterized in that The length of the inclined connection portion is longer than the distance between the columnar portion and the plate-shaped portion that are most adjacent to each other.

8. The cooler according to any one of claims 1 to 7, characterized in that The columnar portion has a shape in which a relationship between a longitudinal width a in the flow direction and a lateral width b in a width direction perpendicular to the flow direction satisfies a / b>1.

9. The cooler according to any one of claims 1 to 8, characterized in that In a cross section perpendicular to the flow direction, a relationship between a width c of the columnar portion and a width d of the plate-shaped portion is c / d>1.

10. The cooler according to any one of claims 1 to 9, characterized in that The inclined connection portion has a concave-convex portion on a side surface.

11. A cooling system, the cooling system being a cooling circuit for a refrigerant to flow, characterized in that: include: A cooler as claimed in any one of claims 1 to 10; a heat exchanger for cooling the refrigerant; a pump that delivers the refrigerant to the cooler; as well as A pipe connects the cooler, the heat exchanger, and the pump.

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