Converter, conversion unit, and storage cabinet

Abstract

To provide a converter, a conversion unit, and a storage cabinet capable of securing air-cooling performance while achieving high-density arrangement with a similar hardware configuration.SOLUTION: A converter includes: a casing having a first chamber and a second chamber partitioned in a vertical direction; a power module disposed in the second chamber; a heat sink disposed in the first chamber and thermally connected to the power module; a first fan that is mounted on the casing and generates a flow in a first direction for introducing air outside the casing from one side in the first direction orthogonal to a vertical direction into the first chamber and discharging air in the first chamber from the other side in the first direction to the outside of the casing or into the second chamber; and a second fan that is mounted on the casing and generates a flow in the vertical direction for introducing air outside the casing from one side in the first direction into the second chamber and discharging air in the second chamber from the other side in the first direction to the outside of the casing.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a converter, a conversion unit, and a storage board. [Background technology]

[0002] 2. Description of the Related Art Energy storage systems (ESSs), power conditioners, and the like are equipped with heat-generating components such as converters, and therefore have a cooling function for cooling these heat-generating components. For example, Patent Document 1 discloses a power conditioner that can cool the inside of a storage panel by taking in outside air. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-103876 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, there is a storage method called rack-mount storage, in which converters are connected in parallel inside a storage panel. In rack-mount storage, multiple converters are stored in a vertical array inside a storage panel, and the converters are cooled by introducing outside air into the inside of each converter. In this case, in order to take in low-temperature outside air into the converters, it is necessary to arrange multiple sets of converters arranged vertically facing each other horizontally. In this case, the air flows that pass through each converter cancel each other out, reducing the air-cooling performance.

[0005] To avoid this situation, it is conceivable to collect the air that has passed through each converter and exhaust it from above the storage panel. However, in order to ensure a sufficiently wide vertical air flow path within the storage panel, the converters must be spaced apart horizontally, making it impossible to arrange the converters at a high density.

[0006] It is also possible to adjust the exhaust direction by, for example, tilting the exhaust port for each converter. However, this requires changing the hardware configuration for each converter, which is not preferable from the viewpoints of improving manufacturing efficiency and standardizing multiple converters.

[0007] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a converter, a conversion unit, and a storage panel that can achieve high-density arrangement while ensuring air-cooling performance with a similar hardware configuration. [Means for solving the problem]

[0008] In order to solve the above problems, the converter of the present disclosure comprises a casing having a first chamber and a second chamber partitioned in the vertical direction, a power module arranged in the second chamber, a heat sink arranged in the first chamber and thermally connected to the power module, a first fan attached to the casing and generating a flow in the first direction that introduces air outside the casing into the first chamber from one side of a first direction perpendicular to the vertical direction and discharges the air in the first chamber from the other side of the first direction to the outside of the casing or into the second chamber, and a second fan attached to the casing and generating a flow in the vertical direction that introduces air outside the casing into the second chamber from one side of the first direction and discharges the air in the second chamber to the outside of the casing from the other side of the first direction.

[0009] In order to solve the above problems, the conversion unit of the present disclosure comprises a plurality of the above converters arranged in the vertical direction, a storage section that houses the plurality of converters, and a third fan that is attached to the storage section and discharges air within the storage section in the vertical direction to outside the storage section, and the first fan introduces air outside the storage section into the first chamber.

[0010] In order to solve the above problems, the storage board according to the present disclosure includes a conversion unit. Effect of the Invention

[0011] According to the converter, conversion unit, and storage panel of the present disclosure, it is possible to achieve a high-density arrangement while ensuring air-cooling performance with a similar hardware configuration. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a schematic configuration diagram of a storage board according to the first embodiment of the present disclosure. [Diagram 2] FIG. 2 is a diagram showing the assembly of a converter within a conversion unit according to a first embodiment of the present disclosure. [Diagram 3] FIG. 2 is a diagram showing details of the internal structure of a conversion unit according to the first embodiment of the present disclosure. [Figure 4] FIG. 11 is a diagram showing details of the internal structure of a conversion unit according to a second embodiment of the present disclosure. [Diagram 5] FIG. 13 is a diagram showing details of the internal structure of a conversion unit according to a third embodiment of the present disclosure. [Figure 6] FIG. 13 is a diagram showing details of the internal structure of a conversion unit according to a fourth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] First Embodiment (Storage board configuration) Hereinafter, a storage board 1, a conversion unit 2, and a converter 20 according to a first embodiment of the present disclosure will be described with reference to FIGS. 1 to 3. FIG. As shown in Fig. 1, the storage panel 1 includes a conversion unit 2 and a control unit 3. The storage panel 1 is used, for example, in an energy storage system (ESS) or a power conditioner. When the storage panel 1 is used, for example, in a power conditioner, an AC / DC converter is provided in the storage panel 1, and when the storage panel 1 is used, for example, as an ESS panel, a storage battery is provided in the storage panel 1.

[0014] In the following description, one direction perpendicular to the up-down direction Dv may be referred to as a first direction D1, and a direction perpendicular to the up-down direction Dv and the first direction D1 may be referred to as a second direction D2.

[0015] (conversion unit) 2 and 3, the conversion unit 2 includes a storage section 4, a converter 20, a third fan 5, an in-panel electrode section 6, a duct 7, a first filter 8, and a louver 9. In Figs. 2 and 3, some components are omitted as appropriate for simplification.

[0016] (Storage section) The storage unit 4 stores a plurality of converters 20. The storage unit 4 employs a rack-mounted storage that can store the converters 20 in parallel in the vertical direction Dv. Inside the storage unit 4, a lattice-shaped framework 4a extending in the vertical direction Dv and the horizontal direction is provided, and the converters 20 are inserted into the framework 4a from the horizontal direction to store the plurality of converters 20. The framework 4a has a plurality of horizontal columns 4b extending in the first direction D1 of the horizontal direction, and a plurality of supporting columns 4c extending in the vertical direction Dv and intersecting with the horizontal columns 4b. The horizontal columns 4b and the supporting columns 4c are each provided in a plurality of positions spaced apart in the second direction D2 of the horizontal direction. In this embodiment, the supporting columns 4c are provided symmetrically on both sides of the storage unit 4 in the first direction D1. The multiple pillars 4c include a first pillar 4c1 provided toward the center of the storage section 4 in the first direction D1, and a second pillar 4c2 provided outside the storage section 4 in the first direction D1 and spaced apart from the first pillar 4c1 in the first direction D1.

[0017] (Converter) A plurality of converters 20 are arranged in the vertical direction Dv in the storage section 4. In this embodiment, two sets of a plurality of converters 20 (three in the illustrated example) arranged in the vertical direction Dv are provided so as to face each other in the first direction D1 when viewed from the second direction D2. All of the converters 20 in the storage section 4 have the same hardware configuration. Note that the "similar configuration" may be the same hardware configuration or may be substantially the same hardware configuration. In addition, all of the converters 20 arranged in the vertical direction Dv are arranged in the same orientation and at the same horizontal position. For one converter 20, one side in the first direction D1 is the outside of the storage section 4, and the other side in the first direction D1 is the inside of the storage section 4.

[0018] The converter 20 includes a casing 30, a power module 21, a male connector 22, a heat sink 23, a first fan 24, a second fan 25, and an attachment piece 26.

[0019] (Casing) The casing 30 has a casing body 31, a partition wall 32, a first chamber 33, a second chamber 34, an attachment hole 35, a first inlet hole 36, a first exhaust hole 37, a second inlet hole 38, a second exhaust hole 39, and a third inlet hole 40. The casing body 31 is formed in a cube shape extending in the first direction D1. The casing body 31 is inserted between two second pillars 4c2 of the framework 4a that face each other in the second direction D2. The end of the casing body 31 on the outer side in the first direction D1 is sandwiched by these two second pillars 4c2 from both sides in the second direction D2. The partition wall 32 is provided in the casing body 31. The partition wall 32 extends in the first direction D1 and the second direction D2 to partition the casing body 31 in the up-down direction Dv. As a result, a first chamber 33 and a second chamber are defined in the vertical direction Dv in the casing body 31. The casing 30 of the present embodiment is disposed such that the first chamber 33 is located below the second chamber .

[0020] The mounting hole 35 is provided in the center of the partition wall 32, and penetrates the partition wall 32 in the up-down direction Dv. A power module 21 and a heat sink 23, which will be described later, are attached to the mounting hole 35. The mounting hole 35 is closed by the power module 21 and the heat sink 23.

[0021] The first introduction hole 36 is formed at one end of the first chamber 33 in the first direction D1. The first introduction hole 36 penetrates the first chamber 33 in the first direction D1. Therefore, the first introduction hole 36 communicates between the outside of the casing 30 and the inside of the first chamber 33, and can introduce air outside the casing 30 into the first chamber 33. Furthermore, the first introduction hole 36 communicates with the outside of the storage section 4 via a duct 7 described later.

[0022] The first exhaust hole 37 is formed at the other end of the first chamber 33 in the first direction D1. The first exhaust hole 37 penetrates the first chamber 33 in the first direction D1. Therefore, the first exhaust hole 37 communicates between the outside of the casing 30 and the inside of the first chamber 33 in the first direction D1, and allows the air in the first chamber 33 to be exhausted to the outside of the casing 30.

[0023] The second introduction hole 38 is formed at one end of the second chamber 34 in the first direction D1. The second introduction hole 38 penetrates the second chamber 34 in the first direction D1. Therefore, the second introduction hole 38 communicates between the outside of the casing 30 and the inside of the second chamber 34, and can introduce air outside the casing 30 into the second chamber 34. Air with little dust inside the storage section 4 is introduced into the second introduction hole 38.

[0024] The second exhaust hole 39 is formed at the end of the top surface of the second chamber 34 on the other side in the first direction D1. The second exhaust hole 39 penetrates the second chamber 34 in the vertical direction Dv. Therefore, the second exhaust hole 39 communicates between the outside of the casing 30 and the inside of the second chamber 34 in the vertical direction Dv, and allows the air in the second chamber 34 to be exhausted to the outside of the casing 30.

[0025] The third introduction hole 40 is formed at the end on the other side in the first direction D1 of the lower surface of the first chamber 33. The third introduction hole 40 penetrates the first chamber 33 in the vertical direction Dv. Therefore, the third introduction hole 40 communicates between the outside of the casing 30 and the inside of the first chamber 33 in the vertical direction Dv, and can introduce air outside the casing 30 into the first chamber 33.

[0026] For one converter 20, the first inlet hole 36 and the first exhaust hole 37 are aligned in a straight line extending in the first direction D1, and the second exhaust hole 39 and the third inlet hole 40 are aligned in a straight line extending in the vertical direction Dv. Furthermore, for two converters 20 adjacent to each other in the vertical direction Dv, the third inlet hole 40 of the upper converter 20 is aligned with the second outlet hole 39 of the lower converter 20 on a straight line extending in the vertical direction Dv.

[0027] (Power Module) The power module 21 is disposed in the second chamber 34. In addition to the power module 21, the second chamber 34 may also accommodate a base plate (not shown) on which the power module 21 is mounted, a capacitor (not shown), and the like. As the power module 21 in each converter 20 generates heat, the temperature inside the storage unit 4 (the temperature inside the storage board 1) becomes higher than the outside of the storage unit 4 (the temperature outside the storage board 1). For example, the temperature inside the storage unit 4 (the temperature inside the storage board 1) is approximately 70°C, and the temperature outside the storage unit 4 (the temperature outside the storage board 1) is approximately 50°C.

[0028] (Terminal) The male connector 22 is provided so as to protrude from the casing 30 to the other side in the first direction D1. The male connector 22 is electrically connected to the power module 21 via a cable (not shown) in the converter 20.

[0029] (heat sink) The heat sink 23 is disposed in the first chamber 33. The heat sink 23 is thermally connected to the power module 21. The heat sink 23 promotes heat transfer from the power module 21 to the air flowing through the first chamber 33. The heat sink 23 has a plurality of fins 23a arranged in the second direction D2. The fins 23a extend in the first direction D1.

[0030] (First Fan) The first fan 24 is attached to the casing 30. In this embodiment, the first fan 24 is disposed in the first chamber 33. More specifically, the first fan 24 is disposed between the first inlet hole 36 and the heat sink 23. The first fan 24 is provided adjacent to the first inlet hole 36 in the first direction D1. The first fan 24 generates a flow in the first direction D1 that introduces air outside the casing 30 into the first chamber 33 from one side of the first direction D1 and discharges air in the first chamber 33 to the outside of the casing 30 from the other side of the first direction D1.

[0031] (Second Fan) The second fan 25 is attached to the casing 30. In this embodiment, the second fan 25 is provided in the second chamber 34 at a position overlapping with the second exhaust hole 39 in the up-down direction Dv. More specifically, the second fan 25 is attached to the upper surface of the second chamber 34 so as to cover the second exhaust hole 39. The second fan 25 generates a flow in the up-down direction Dv that introduces air outside the casing 30 into the second chamber 34 from one side of the first direction D1 and exhausts air in the second chamber 34 to the outside of the casing 30 from the other side of the first direction D1. In this embodiment, the second fan 25 generates an upward flow.

[0032] The mounting pieces 26 are provided on the end of the casing 30 opposite to the male connector 22. The mounting pieces 26 are provided on both side surfaces of the casing body 31 facing the second direction D2. Each mounting piece 26 protrudes from the casing body 31 in the second direction D2. When the male connector 22 is inserted into the female connector 11 described below, the mounting pieces 26 come into contact with the second support pillars 4c2 of the frame 4a from outside in the first direction D1. The mounting pieces 26 are fixed to the second support pillars 4c2 by bolt fixing. This fixes the arrangement of the converter 20.

[0033] (Third Fan) The third fan 5 is attached to the storage section 4 and exhausts air inside the storage section 4 in the vertical direction Dv to the outside of the storage section 4. In this embodiment, the third fan 5 is provided above the multiple converters 20 and between pairs of converters 20 arranged in the vertical direction Dv facing the first direction D1 when viewed from the vertical direction Dv. The third fan 5 exhausts air inside the storage section 4 upward.

[0034] (Electrode section inside the panel) Two in-board electrode units 6 are provided between pairs of converters 20 arranged in the vertical direction Dv. The in-board electrode units 6 have a frame body 10 and a female connector 11. The frame body 10 extends in the vertical direction Dv, and air inside the storage board 1 can pass through the frame body 10. A plurality of female connectors 11 are provided on the frame body 10 for each converter 20. The male connector 22 of the converter 20 is connected to the female connector 11. In this manner, the in-board electrode units 6 are electrically connected to the converters 20.

[0035] (duct) The duct 7 is attached to the outer wall of the first chamber 33. The duct 7 extends from the first introduction hole 36 to one side in the first direction D1 (outside the storage section 4) and is connected to the inner wall of the storage section 4. The duct 7 is inclined linearly so as to be gradually positioned downward toward the other side in the first direction D1 (inside the storage section 4, the first introduction hole 36 side). The duct 7 communicates between the outside of the storage section 4 and the inside of the first chamber 33, and guides the air outside the storage section 4 into the first chamber 33. The first fan 24 guides the air outside the storage section 4 into the first chamber 33 via the duct 7.

[0036] (First filter) A first filter 8 is provided for each duct 7. The first filter 8 is attached to the storage section 4 and closes an opening on one side of the duct 7 in the first direction D1. The first filter 8 collects dust contained in the air flowing through the duct 7.

[0037] (louver) The louver 9 is disposed on the other side in the first direction D1 of the first exhaust hole 37 of the converter 20 disposed at the lowest position within the storage section 4. The louver 9 is inclined so as to be positioned gradually higher as it moves from one side to the other side in the first direction D1. The louver 9 can redirect the flow of air discharged from the first exhaust hole 37 upward.

[0038] (Control unit) The control unit 3 is provided in the storage board 1. The control unit 3 controls various devices in the storage board 1. The control unit 3 controls the rotation speeds of the first fan 24, the second fan 25, and the third fan 5, for example.

[0039] (Action and effect) The converter 20 having the above configuration includes a casing 30, a power module 21, a heat sink 23, a first fan 24, and a second fan 25. The casing 30 has a first chamber 33 and a second chamber 34 that are partitioned in the vertical direction Dv. The power module 21 is disposed in the second chamber 34. The heat sink 23 is disposed in the first chamber 33 and is thermally connected to the power module 21. The first fan 24 generates a flow in the first direction D1 that introduces air outside the casing 30 into the first chamber 33 from one side of the first direction D1 and discharges the air in the first chamber 33 to the outside of the casing 30 from the other side of the first direction D1. The second fan 25 generates a flow in the vertical direction Dv that introduces air outside the casing 30 into the second chamber 34 from one side of the first direction D1 and discharges the air in the second chamber 34 to the outside of the casing 30 from the other side of the first direction D1.

[0040] In this embodiment, a first chamber 33 and a second chamber 34 are partitioned. Therefore, by introducing air with less dust into the second chamber 34 in which the power module 21 is disposed, the power module 21, the drive board (not shown), and the control board (not shown) can be air-cooled without being contaminated by dust. Furthermore, by introducing low-temperature outside air into the first chamber 33, the power module 21 can be more effectively cooled via the heat sink 23. In addition, the converter 20 of this embodiment can exhaust the air in the second chamber 34 of the casing 30 in the vertical direction Dv by the second fan 25. As a result, when a plurality of converters 20 are arranged in the vertical direction Dv, the air after cooling can be smoothly exhausted from each converter 20 in the vertical direction Dv by the flow in the vertical direction Dv by the plurality of second fans 25. Furthermore, by controlling the rotation speed of each second fan 25, the exhaust direction can be adjusted, so that the exhaust can be performed more smoothly and the pressure loss of the cooling air can be reduced. Therefore, each converter 20 can be sufficiently air-cooled. For example, in this embodiment, the second fan 25 of the converter 20 located at the lower side has a higher rotation speed and a larger air volume. As a result, the upward component of the flow of the air exhausted from the first exhaust hole 37 of the converter 20 located at the lower side increases, making it easier to flow upward. Therefore, even when groups of multiple converters 20 arranged in the vertical direction Dv are arranged facing each other in the horizontal direction as in this embodiment, the converters 20 can be arranged at high density without excessively increasing the horizontal (first direction D1) interval between the groups of multiple converters 20. Therefore, it is possible to realize a high-density arrangement of the converters 20 while ensuring air-cooling performance, without changing the hardware configuration of each converter 20, and with the same hardware configuration for all converters 20.

[0041] The conversion unit 2 of this embodiment includes a converter 20, a storage section 4, and a third fan 5 attached to the storage section 4. The first fan 24 introduces air outside the storage section 4 into the first chamber 33. A plurality of converters 20 are arranged in the vertical direction Dv. The storage section 4 houses a plurality of converters 20. The third fan 5 is attached to the storage section 4 and exhausts air inside the storage section 4 to the outside of the storage section 4 in the vertical direction Dv. Furthermore, the first fan 24 introduces air outside the storage section 4 into the first chamber 33.

[0042] Low-temperature air is introduced from outside the storage section 4 into the first chamber 33 of each converter 20. Then, the second fan 25 causes a vertical flow Dv, and the third fan 5 exhausts the air that has cooled each converter 20 in the vertical direction Dv. In this manner, low-temperature air from outside the storage section 4 is constantly introduced into each converter 20, and the cooled air can be smoothly exhausted to the outside of the storage section 4, reducing pressure loss of the cooling air. Thus, each converter 20 can be sufficiently cooled. Thus, without changing the hardware configuration of each converter 20, the converters 20 can be arranged in a high density while ensuring air-cooling performance with the same hardware configuration.

[0043] In this embodiment, the casing 30 is disposed so that the first chamber 33 is located below the second chamber 34. The casing 30 has a first inlet 36, a first exhaust hole 37, a second inlet 38, a second exhaust hole 39, and a third inlet 40. The first inlet 36 is in communication with the outside of the casing 30. The second fan 25 is provided at a position overlapping with the second exhaust hole 39 in the up-down direction Dv, and generates an upward flow. The third fan 5 is provided above the multiple converters 20, and exhausts the air in the storage section 4 upward. The conversion unit 2 further includes a louver 9. The louver 9 is disposed on the other side of the first direction D1 with respect to the first exhaust hole 37 of the converter 20 disposed at the bottom. The louver 9 is inclined so as to be gradually positioned upward as it moves from one side to the other side of the first direction D1, and redirects the flow of air exhausted from the first exhaust hole 37 upward.

[0044] By driving the first fan 24, an air flow from one side to the other side in the first direction D1 is generated in the first chamber 33. This causes cold air outside the storage section 4 to be introduced into the first chamber 33 through the first inlet hole 36, pass through the heat sink 23, and be discharged from the first exhaust hole 37. By driving the second fan 25, the air within the second chamber 34 is discharged upward through the second exhaust holes 39. Moreover, the air discharged from the second exhaust hole 39 of the lower converter 20 is introduced into the end portion on the other side in the first direction D1 of the first chamber 33 of the upper converter 20 through the third introduction hole 40. As a result, an upward flow is added to the flow of air in the first chamber 33 immediately before it is discharged from the first exhaust hole 37. As a result, the air discharged from the first exhaust hole 37 is also discharged upward. In addition, for the converter 20 arranged at the bottom, the inclination of the louvers 9 causes the flow of air discharged from the first exhaust hole 37 to be redirected upward. In this manner, the cooled air discharged from all the converters 20 is guided upward and smoothly discharged to the outside of the storage section 4 by the third fan 5. This makes it possible to reduce pressure loss of the cooling air. Therefore, while minimizing the number of louvers 9, it is possible to realize a high-density arrangement of the converters 20 while ensuring air-cooling performance by using the same hardware configuration for all the converters 20 without changing the hardware configuration of each converter 20.

[0045] In the present embodiment, the first introduction hole 36 penetrates the first chamber 33 in the first direction D1, but this is not limited thereto. For example, the first introduction hole 36 may penetrate the lower surface of the first chamber 33 in the up-down direction Dv, or may penetrate the first chamber 33 in the second direction D2. However, when the first introduction hole 36 penetrates the first chamber 33 in the first direction D1, this is advantageous in that the air outside the casing 30 can be smoothly introduced into the first chamber 33 by the flow in the first direction D1 by the first fan 24.

[0046] In the present embodiment, the second introduction hole 38 penetrates the second chamber 34 in the first direction D1, but is not limited to this. For example, the second introduction hole 38 may penetrate the upper surface of the second chamber 34 in the up-down direction Dv, or may penetrate the second chamber 34 in the second direction D2.

[0047] In the present embodiment, the first fan 24 is disposed inside the first chamber 33, but the present invention is not limited to this. For example, the first fan 24 may be attached to the outer wall of the first chamber 33 so as to cover the first introduction hole 36.

[0048] In the present embodiment, the second fan 25 is disposed inside the second chamber 34, but the present invention is not limited to this. For example, the second fan 25 may be attached to the outer wall of the second chamber 34 so as to cover the second exhaust hole 39.

[0049] <Second embodiment> Hereinafter, the storage board 101, the conversion unit 102, and the converter 120 according to the second embodiment of the present disclosure will be described with reference to Fig. 4. Among the configurations of the second embodiment, the configurations common to the above embodiment will be denoted by the same reference numerals and the description thereof will be omitted. 4, the casing 130 of this embodiment has a casing body 131, a partition wall 32, a first chamber 33, a second chamber 34, an attachment hole 35, a first inlet hole 136, a first outlet hole 137, a second inlet hole 138, and a second outlet hole 139. The casing 130 is disposed such that the first chamber 33 is located above the second chamber 34.

[0050] The first introduction hole 136 is formed at one end of the first chamber 33 in the first direction D1. The first introduction hole 136 penetrates the first chamber 33 in the first direction D1. Therefore, the first introduction hole 136 communicates between the outside of the casing 130 and the inside of the first chamber 33, and can introduce air outside the casing 130 into the first chamber 33. Furthermore, the first introduction hole 136 communicates with the outside of the storage section 4 via the duct 7.

[0051] The first exhaust hole 137 is formed at the end of the first chamber 33 on the other side in the first direction D1. The first exhaust hole 137 penetrates the first chamber 33 in the up-down direction Dv and the first direction D1. Therefore, the first exhaust hole 137 communicates between the outside of the casing 130 and the inside of the first chamber 33 in the up-down direction Dv and the first direction D1, and can exhaust the air in the first chamber 33 to the outside of the casing 130.

[0052] The second introduction hole 138 is formed at one end of the second chamber 34 in the first direction D1. The second introduction hole 138 penetrates the second chamber 34 in the first direction D1. The second introduction hole 138 communicates between the outside of the casing 130 and the inside of the second chamber 34, and can introduce air outside the casing 130 into the second chamber 34. Air with little dust inside the storage section 4 is introduced into the second introduction hole 138.

[0053] The second exhaust hole 139 is formed at the end of the top surface of the second chamber 34 on the other side in the first direction D1. The second exhaust hole 139 penetrates the second chamber 34 in the up-down direction Dv. The second exhaust hole 139 communicates the first chamber 33 and the second chamber 34 in the up-down direction Dv, and allows air in the second chamber 34 to be exhausted into the first chamber 33.

[0054] For one converter 120, the first inlet hole 136 and the first exhaust hole 137 are aligned in a straight line extending in the first direction D1, and the first exhaust hole 137 and the second exhaust hole 139 are aligned in a straight line extending in the vertical direction Dv.

[0055] The second fan 25 is provided in the first chamber 33 at a position overlapping with the second exhaust hole 139 in the up-down direction Dv. More specifically, the second fan 25 is attached to the lower surface of the first chamber 33 so as to cover the second exhaust hole 139. In this embodiment, the second fan 25 generates an upward flow.

[0056] (Action and effect) In the conversion unit 102 having the above-mentioned configuration, the casing 130 is disposed so that the first chamber 33 is located above the second chamber 34. The casing 130 has a first inlet hole 136, a first exhaust hole 137, a second inlet hole 138, and a second exhaust hole 139. The first inlet hole 136 communicates with the outside of the storage section 4. The second fan 25 is provided at a position overlapping with the second exhaust hole 139 in the up-down direction Dv, and generates an upward flow. The third fan 5 is provided above the multiple converters 120, and exhausts the air in the storage section 4 upward.

[0057] By driving the first fan 24, an air flow from one side to the other side in the first direction D1 is generated in the first chamber 33. This causes cold air outside the storage section 4 to be introduced into the first chamber 33 through the first inlet hole 136, pass through the heat sink 23, and be discharged from the first exhaust hole 137. By driving the second fan 25, the air within the second chamber 34 is discharged upward from the second exhaust hole 139. At the first exhaust hole 137, the air flow from one side to the other side in the first direction D1 by the first fan 24 is redirected upward by the upward flow by the second fan 25. In this manner, the cooled air discharged from all the converters 120 is guided upward and smoothly discharged to the outside of the storage section 4 by the third fan 5. This makes it possible to reduce pressure loss of the cooling air. According to this embodiment, the cooled air can be smoothly exhausted using only the hardware configuration of the converters 120, without using louvers 9 or the like. Therefore, without changing the hardware configuration of each converter 120, all the converters 120 can be arranged in a high density manner while ensuring air-cooling performance with the same hardware configuration.

[0058] In the present embodiment, the first introduction hole 136 penetrates the first chamber 33 in the first direction D1, but this is not limited thereto. For example, the first introduction hole 136 may penetrate the upper surface of the first chamber 33 in the up-down direction Dv, or may penetrate the first chamber 33 in the second direction D2. However, when the first introduction hole 136 penetrates the first chamber 33 in the first direction D1, this is advantageous in that the air outside the casing 130 can be smoothly introduced into the first chamber 33 by the flow in the first direction D1 by the first fan 24.

[0059] In the present embodiment, the second introduction hole 138 penetrates the second chamber 34 in the first direction D1, but this is not limited to this. For example, the second introduction hole 138 may penetrate the lower surface of the second chamber 34 in the up-down direction Dv, or may penetrate the second chamber 34 in the second direction D2.

[0060] In the present embodiment, the first fan 24 is disposed inside the first chamber 33, but the present invention is not limited to this. For example, the first fan 24 may be attached to the outer wall of the first chamber 33 so as to cover the first introduction hole 136.

[0061] In the present embodiment, the second fan 25 is disposed in the first chamber 33, but the present invention is not limited to this. For example, the second fan 25 may be attached to the inner wall of the second chamber 34 so as to cover the second exhaust hole 139.

[0062] <Third embodiment> Hereinafter, a storage board 201, a conversion unit 202, and a converter 20 according to a third embodiment of the present disclosure will be described with reference to Fig. 5. Among the configurations of the third embodiment, configurations common to the above-mentioned embodiments will be denoted by the same reference numerals and description thereof will be omitted. As shown in FIG. 5, the conversion unit 202 of this embodiment is provided with a converter 20 similar to that of the first embodiment. That is, the casing 30 has a casing body 31, a partition wall 32, a first chamber 33, a second chamber 34, an attachment hole 35, a first inlet hole 36, a first exhaust hole 37, a second inlet hole 38, a second exhaust hole 39, and a third inlet hole 40, similar to the first embodiment. The casing 30 is disposed such that the first chamber 33 is located below the second chamber 34. The first inlet hole 36 communicates with the outside of the storage section 4. The second fan 25 is provided at a position overlapping with the second exhaust hole 39 in the up-down direction Dv.

[0063] Furthermore, the conversion unit 202 includes a partition plate 215, an inner panel 217, and a second filter 218. The partition plate 215 is provided below the multiple converters 20. The partition plate 215 forms a flow path 216 on the lower surface inside the storage unit 4, which extends to the outside of the storage unit 4. Air sucked from outside the storage unit 4 flows through this flow path 216. The flow path 216 extends in a first direction D1. Note that a cable or the like may be arranged in this flow path 216.

[0064] The inner panel 217 is disposed on the other side in the first direction D1 with respect to the multiple converters 20. The inner panel 217 extends in the up-down direction Dv. In the space S between the inner panel 217 and the multiple converters 20, cables, terminal blocks, fuses, etc. are disposed.

[0065] The second filter 218 is provided at an outlet on one side in the first direction D1 of the flow path 216. The second filter 218 collects dust contained in the air.

[0066] In this embodiment, the third fan 5 includes an upper fan 5a provided above the multiple converters 20, and a lower fan 5b provided below the multiple converters 20 and on the other side of the first direction D1. The upper fan 5a is attached to the top of the storage section 4. The upper fan 5a exhausts air in the storage section 4 upward. The lower fan 5b is attached to the partition plate 215. The lower fan 5b is provided below the space S between the multiple converters 20 and the inner panel 217. The lower fan 5b draws in air from outside the storage section 4 and generates an upward air flow in the storage section 4.

[0067] (Action and effect) In the conversion unit 202 having the above configuration, the casing 30 is disposed so that the first chamber 33 is located below the second chamber 34. The casing 30 has a first inlet 36, a first exhaust hole 37, a second inlet 38, a second exhaust hole 39, and a third inlet 40. The first inlet 36 is in communication with the outside of the storage section 4. The second fan 25 is provided at a position overlapping with the second exhaust hole 39 in the up-down direction Dv. The third fan 5 includes an upper fan 5a provided above the multiple converters 20, and a lower fan 5b provided below the multiple converters 20 and on the other side of the first direction D1. The upper fan 5a exhausts air in the storage section 4 upward. The lower fan 5b draws in air from the outside of the storage section 4 and generates an upward air flow in the storage section 4.

[0068] By driving the first fan 24, an air flow from one side to the other side in the first direction D1 is generated in the first chamber 33. This causes cold air outside the storage section 4 to be introduced into the first chamber 33 through the first inlet hole 36, pass through the heat sink 23, and be discharged from the first exhaust hole 37. By driving the second fan 25, the air within the second chamber 34 is discharged upward through the second exhaust holes 39. Moreover, the air discharged from the second exhaust hole 39 of the lower converter 20 is introduced into the end portion on the other side in the first direction D1 of the first chamber 33 of the upper converter 20 through the third introduction hole 40. As a result, an upward flow is added to the flow of air in the first chamber 33 immediately before it is discharged from the first exhaust hole 37. As a result, the air discharged from the first exhaust hole 37 is also discharged upward. For the converter 20 disposed at the bottom, the flow of air discharged from the first exhaust hole 37 is redirected upward by the lower fan 5b. In this manner, the cooled air discharged from all the converters 20 is guided upward and smoothly discharged by the upper fan 5a to the outside of the storage unit 4. This makes it possible to reduce pressure loss of the cooling air. Therefore, without using the louvers 9 and without changing the hardware configuration of each converter 20, it is possible to realize a high-density arrangement of the converters 20 while ensuring air-cooling performance, all with the same hardware configuration. Furthermore, since the lower fan 5b can suck in cool air outside the storage section 4, the temperature inside the storage section 4 can be lowered and the air-cooling performance can be improved.

[0069] <Fourth embodiment> Hereinafter, a storage board 301, a conversion unit 302, and a converter 320 according to a fourth embodiment of the present disclosure will be described with reference to Fig. 6. Among the configurations of the fourth embodiment, configurations common to the above-mentioned embodiments will be denoted by the same reference numerals and description thereof will be omitted. 6, the casing 330 of this embodiment has a casing body 331, a partition wall 32, a first chamber 33, a second chamber 34, an attachment hole 35, a first inlet hole 336, a first exhaust hole 337, a second inlet hole 338, a second exhaust hole 339, and a third inlet hole 340. The casing 330 is disposed such that the first chamber 33 is located below the second chamber 34.

[0070] The first introduction hole 336 is formed at one end of the first chamber 33 in the first direction D1. The first introduction hole 336 penetrates the first chamber 33 in the first direction D1. Therefore, the first introduction hole 336 communicates between the outside of the casing 330 and the inside of the first chamber 33, and can introduce air outside the casing 330 into the first chamber 33. Furthermore, the first introduction hole 336 communicates with the outside of the storage section 4 via the duct 7.

[0071] The first exhaust hole 337 is formed at an end portion on the other side in the first direction D1 of the lower surface of the first chamber 33. The first exhaust hole 337 penetrates the first chamber 33 in the up-down direction Dv. Therefore, the first exhaust hole 337 communicates between the outside of the casing 330 and the inside of the first chamber 33 in the up-down direction Dv, and allows the air in the first chamber 33 to be exhausted to the outside of the casing 330.

[0072] The second introduction hole 338 is formed at one end of the second chamber 34 in the first direction D1. The second introduction hole 338 penetrates the second chamber 34 in the first direction D1. The second introduction hole 338 communicates between the outside of the casing 330 and the inside of the second chamber 34, and can introduce air outside the casing 330 into the second chamber 34. Air with little dust inside the storage section 4 is introduced into the second introduction hole 338.

[0073] The second exhaust hole 339 is formed at an end portion on the other side in the first direction D1 of the lower surface of the second chamber 34. The second exhaust hole 339 penetrates the second chamber 34 in the up-down direction Dv. The second exhaust hole 339 communicates the first chamber 33 and the second chamber 34 in the up-down direction Dv, and allows air in the second chamber 34 to be exhausted into the first chamber 33.

[0074] The third introduction hole 340 is formed at the end of the top surface of the second chamber 34 on the other side in the first direction D1. The third introduction hole 340 penetrates the second chamber 34 in the up-down direction Dv. The third introduction hole 340 communicates between the outside of the casing 330 and the inside of the second chamber 34 in the up-down direction Dv, and can introduce air outside the casing 330 into the second chamber 34.

[0075] For one converter 320, the first exhaust hole 337, the second exhaust hole 339, and the third introduction hole 340 are aligned on a straight line extending in the vertical direction Dv. Furthermore, for two converters 320 adjacent to each other in the vertical direction Dv, the first exhaust hole 337 of the upper converter 320 is aligned with the third introduction hole 340 of the lower converter 320 on a straight line extending in the vertical direction Dv.

[0076] The second fan 25 is provided in the second chamber 34 at a position overlapping with the second exhaust hole 339 in the up-down direction Dv. The second fan 25 is attached to the lower surface of the second chamber 34 so as to cover the third introduction hole 340. In this embodiment, the second fan 25 generates a downward flow.

[0077] Furthermore, the conversion unit 302 includes a partition plate 215, an inner plate 217, and a second filter 218. As in the third embodiment, the partition plate 215 forms a flow path 216 on the lower surface inside the storage unit 4, which extends to the outside of the storage unit 4. However, in the flow path 216 of this embodiment, the cooled water that has passed through the converter 320 flows.

[0078] In this embodiment, the third fan 5 includes an upper fan 5a provided above the converters 320 and a lower fan 5b provided directly below the converters 320. The upper fan 5a is attached to the upper part of the storage unit 4. The upper fan 5a draws air outside the storage unit 4 downward. The lower fan 5b is attached to the partition plate 215. The lower fan 5b generates a downward air flow in the storage unit 4 to exhaust the air in the storage unit 4. The lower fan 5b may be provided below the partition plate 215 and in the flow path 216, as shown by a virtual line (two-dot chain line) in FIG. 6. In this case, the partition plate 215 needs to have a through hole (not shown) for guiding the air exhausted from the converters 320 into the flow path 216, for example, at a position overlapping with the first exhaust hole 337 of the lowest converter 320 in the up-down direction Dv.

[0079] (Action and effect) In the conversion unit 302 having the above configuration, the casing 330 is disposed so that the first chamber 33 is located below the second chamber 34. The casing 330 has a first inlet 336, a first exhaust hole 337, a second inlet 338, a second exhaust hole 339, and a third inlet 340. The first inlet 336 communicates with the outside of the storage section 4. The second fan 25 is provided at a position overlapping with the second exhaust hole 339 in the up-down direction Dv, and generates a downward flow. The third fan 5 includes an upper fan 5a provided above the multiple converters 320, and a lower fan 5b provided directly below the multiple converters 320. The upper fan 5a draws in air outside the storage section 4 downward. The lower fan 5b generates a downward air flow in the storage section 4 to discharge the air in the storage section 4.

[0080] By driving the first fan 24, an air flow from one side to the other side in the first direction D1 is generated in the first chamber 33. This causes cold air outside the storage section 4 to be introduced into the first chamber 33 through the first inlet hole 336, pass through the heat sink 23, and be discharged from the first exhaust hole 337. By driving the second fan 25, air above the second chamber 34 is drawn in through the third inlet hole 340, and the air within the second chamber 34 is discharged downward through the second exhaust hole 339, and then discharged downward through the first exhaust hole 337 together with the air within the first chamber 33. Moreover, the air discharged from the first exhaust hole 337 of the upper converter 320 is introduced into the second chamber 34 of the lower converter 320 through the third introduction hole 340. In this manner, the cooled air is sent sequentially from the upper converter 320 to the lower converter 320. In this manner, the cooled air discharged from all the converters 320 is guided downward and smoothly discharged by the lower fan 5b to the outside of the storage unit 4. This makes it possible to reduce pressure loss of the cooling air. Therefore, without changing the hardware configuration of each converter 320, all the converters 320 have the same hardware configuration, and it is possible to realize a high-density arrangement of the converters 320 while ensuring air-cooling performance. Furthermore, since the upper fan 5a can suck in air with less dust from the upper surface of the storage section 4, the amount of dust inside the storage section 4 can be reduced. Furthermore, since the space S between the multiple converters 320 and the inner plate 217 for circulating air on the other side of the multiple converters 320 in the first direction can be minimized, the conversion unit 302 can be designed to be compact. Therefore, it can be designed with even higher density.

[0081] In the present embodiment, the first introduction hole 336 penetrates the first chamber 33 in the first direction D1, but this is not limited thereto. For example, the first introduction hole 336 may penetrate the lower surface of the first chamber 33 in the up-down direction Dv, or may penetrate the first chamber 33 in the second direction D2. However, when the first introduction hole 336 penetrates the first chamber 33 in the first direction D1, this is advantageous in that the air outside the casing 330 can be smoothly introduced into the first chamber 33 by the flow in the first direction D1 by the first fan 24.

[0082] In the present embodiment, the second introduction hole 338 penetrates the second chamber 34 in the first direction D1, but is not limited to this. For example, the second introduction hole 338 may penetrate the upper surface of the second chamber 34 in the up-down direction Dv, or may penetrate the second chamber 34 in the second direction D2.

[0083] In the present embodiment, the first fan 24 is disposed inside the first chamber 33, but the present invention is not limited to this. For example, the first fan 24 may be attached to the outer wall of the first chamber 33 so as to cover the first introduction hole 336.

[0084] In the present embodiment, the second fan 25 is disposed in the second chamber 34, but the present invention is not limited to this. For example, the second fan 25 may be attached to the inner wall of the first chamber 33 so as to cover the second exhaust hole 339.

[0085] (Other embodiments) Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not depart from the gist of the present disclosure are also included. In the above embodiment, the converters 20, 120, 320 are arranged in three in the vertical direction, but the present invention is not limited to this. The number of converters 20, 120, 320 can be changed as appropriate, and the converters 20, 120, 320 may be arranged in two or four or more in the vertical direction in the storage section 4.

[0086] <Additional Notes> The converters 20, 120, 320, conversion units 2, 102, 202, 302, and storage boards 1, 101, 201, 301 described in the respective embodiments can be understood, for example, as follows.

[0087] (1) A converter 20, 120, 320 according to a first aspect includes a casing 30, 130, 330 having a first chamber 33 and a second chamber 34 partitioned in a vertical direction Dv, a power module 21 arranged in the second chamber 34, a heat sink 23 arranged in the first chamber 33 and thermally connected to the power module 21, and a heat sink 23 attached to the casing 30, 130, 330. The heat sink 23 introduces air outside the casing 30, 130, 330 into the first chamber 33 from one side of a first direction D1 perpendicular to the vertical direction Dv, and heats the air in the first direction D1. The fan is provided with a first fan 24 that generates a flow in the first direction D1 that discharges the air in the first chamber 33 from the other side of D1 outside the casing 30, 130, 330 or into the second chamber 34, and a second fan 25 that is attached to the casing 30, 130, 330 and generates a flow in the vertical direction Dv that introduces the air outside the casing 30, 130, 330 from one side of the first direction D1 into the second chamber 34 and discharges the air in the second chamber 34 outside the casing 30, 130, 330 from the other side of the first direction D1.

[0088] In this embodiment, the first chamber 33 and the second chamber 34 are partitioned. Therefore, air with less dust can be introduced into the second chamber 34 in which the power module 21 is disposed. Furthermore, low-temperature outside air can be introduced into the first chamber 33. In addition, when the converters 20, 120, 320 are arranged in a vertical direction Dv, the air after cooling can be smoothly exhausted from each converter 20, 120, 320 in the vertical direction Dv by the flow in the vertical direction Dv by the second fans 25. Furthermore, by controlling the rotation speed of each second fan 25, the exhaust direction can be adjusted, so that the exhaust can be performed more smoothly and the pressure loss of the cooling air can be reduced. Therefore, each converter 20, 120, 320 can be sufficiently air-cooled. Therefore, even when the sets of the converters 20, 120, 320 arranged in the vertical direction Dv are arranged facing each other in the horizontal direction, the converters 20, 120, 320 can be arranged at a high density without excessively increasing the horizontal interval between the sets of the converters 20, 120, 320. Therefore, without changing the hardware configuration of each of the converters 20, 120, 320, all of them have the same hardware configuration, it is possible to realize a high-density arrangement of the multiple converters 20, 120, 320 while ensuring air-cooling performance.

[0089] (2) The second aspect of the conversion unit 2, 102, 202, 302 comprises a plurality of converters 20, 120, 320 of the first aspect arranged in a vertical direction Dv, a storage section 4 for storing the plurality of converters 20, 120, 320, and a third fan 5 attached to the storage section 4 for exhausting air within the storage section 4 to the outside of the storage section 4 in the vertical direction Dv, and the first fan 24 introduces air outside the storage section 4 into the first chamber 33.

[0090] Low-temperature air is introduced from outside the storage section 4 into the first chamber 33 of each converter 20, 120, 320. Then, the second fan 25 causes a vertical flow Dv and the third fan 5 causes the air that has cooled each converter 20, 120, 320 to be discharged in the vertical direction Dv. In this manner, low-temperature air from outside the storage section 4 is always introduced into each converter 20, 120, 320, and the cooled air can be smoothly discharged outside the storage section 4, thereby reducing the pressure loss of the cooling air. Therefore, each converter 20, 120, 320 can be sufficiently cooled. Therefore, without changing the hardware configuration of each converter 20, 120, 320, the converters 20, 120, 320 can be arranged in a high density manner while ensuring air-cooling performance with the same hardware configuration.

[0091] (3) A third aspect of the conversion unit 2 is the conversion unit 2 of the second aspect, wherein the casing 30 is arranged such that the first chamber 33 is located below the second chamber 34, and the casing 30 is provided with a first introduction hole 36 formed at an end of the first chamber 33 on one side in the first direction D1, which communicates the outside of the casing 30 with the inside of the first chamber 33 and introduces air outside the casing 30 into the first chamber 33, and a second introduction hole 36 formed at an end of the first chamber 33 on the other side in the first direction D1, a first exhaust hole 37 that connects the outside of the casing 30 with the inside of the first chamber 33 in the first direction D1 and exhausts air in the first chamber 33 to the outside of the casing 30; a second introduction hole 38 that is formed at an end of the second chamber 34 on one side in the first direction D1 and connects the outside of the casing 30 with the inside of the second chamber 34 and introduces air outside the casing 30 into the second chamber 34; a second exhaust hole 39 that communicates with the inside of the second chamber 34 in the vertical direction Dv and exhausts air in the second chamber 34 to the outside of the casing 30; and a third inlet hole 40 that is formed at an end of the lower surface of the first chamber 33 on the other side in the first direction D1, that communicates with the outside of the casing 30 and the inside of the first chamber 33 in the vertical direction Dv and introduces air outside the casing 30 into the first chamber 33. The first inlet hole 36 communicates with the outside of the storage section 4, and the second fan 25 is connected to the second exhaust hole 39 in the vertical direction D v and generates an upward flow, the third fan 5 is provided above the multiple converters 20 and discharges the air in the storage section 4 upward, and may further include a louver 9 that is disposed on the other side of the first direction D1 with respect to the first discharge hole 37 of the converter 20 disposed at the lowest position and is inclined so as to be gradually positioned upward as it goes from one side to the other side of the first direction D1, and that redirects the flow of air discharged from the first discharge hole 37 upward.

[0092] By driving the first fan 24, an air flow from one side to the other side in the first direction D1 is generated in the first chamber 33. This causes cold air outside the storage section 4 to be introduced into the first chamber 33 through the first inlet hole 36, pass through the heat sink 23, and be discharged from the first exhaust hole 37. By driving the second fan 25, the air within the second chamber 34 is discharged upward through the second exhaust holes 39. Moreover, the air discharged from the second exhaust hole 39 of the lower converter 20 is introduced into the end portion on the other side in the first direction D1 of the first chamber 33 of the upper converter 20 through the third introduction hole 40. As a result, an upward flow is added to the flow of air in the first chamber 33 immediately before it is discharged from the first exhaust hole 37. As a result, the air discharged from the first exhaust hole 37 is also discharged upward. In addition, for the converter 20 arranged at the bottom, the inclination of the louvers 9 causes the flow of air discharged from the first exhaust hole 37 to be redirected upward. In this manner, the cooled air discharged from all the converters 20 is guided upward and smoothly discharged to the outside of the storage section 4 by the third fan 5. This makes it possible to reduce pressure loss of the cooling air. Therefore, while minimizing the number of louvers 9, it is possible to realize a high-density arrangement of the converters 20 while ensuring air-cooling performance by using the same hardware configuration for all the converters 20 without changing the hardware configuration of each converter 20.

[0093] (4) A fourth aspect of the conversion unit 102 is the conversion unit 102 of the second aspect, wherein the casing 130 is arranged such that the first chamber 33 is located above the second chamber 34, and the casing 130 is provided with a first inlet hole 136 formed at an end of the first chamber 33 on one side in the first direction D1, which communicates between the outside of the casing 130 and the inside of the first chamber 33 and introduces air outside the casing 130 into the first chamber 33, a first exhaust hole 137 formed at an end of the first chamber 33 on the other side in the first direction D1, which communicates between the outside of the casing 130 and the inside of the first chamber 33 in the vertical direction Dv and the first direction D1 and exhausts air in the first chamber 33 to the outside of the casing 130, and ... The casing 20 has a second inlet hole 138 formed at one end in the direction D1, connecting the outside of the casing 130 with the inside of the second chamber 34, and introducing air outside the casing 130 into the second chamber 34, and a second exhaust hole 139 formed at the other end of the upper surface of the second chamber 34 in the first direction D1, connecting the inside of the first chamber 33 with the inside of the second chamber 34 in the vertical direction Dv, and discharging air within the second chamber 34 into the first chamber 33, wherein the first inlet hole 136 communicates with the outside of the storage section 4, and the second fan 25 is provided at a position overlapping with the second exhaust hole 139 in the vertical direction Dv and generates an upward flow, and the third fan 5 is provided above the multiple converters 120 and may discharge air within the storage section 4 upward.

[0094] By driving the first fan 24, an air flow from one side to the other side in the first direction D1 is generated in the first chamber 33. This causes cold air outside the storage section 4 to be introduced into the first chamber 33 through the first inlet hole 136, pass through the heat sink 23, and be discharged from the first exhaust hole 137. By driving the second fan 25, the air within the second chamber 34 is discharged upward from the second exhaust hole 139. At the first exhaust hole 137, the air flow from one side to the other side in the first direction D1 by the first fan 24 is redirected upward by the upward flow by the second fan 25. In this manner, the cooled air discharged from all the converters 120 is guided upward and smoothly discharged to the outside of the storage section 4 by the third fan 5. This makes it possible to reduce pressure loss of the cooling air. According to this embodiment, the cooled air can be smoothly exhausted using only the hardware configuration of the converters 120, without using louvers 9 or the like. Therefore, without changing the hardware configuration of each converter 120, all the converters 120 can be arranged in a high density manner while ensuring air-cooling performance with the same hardware configuration.

[0095] (5) A fifth aspect of the conversion unit 202 is the conversion unit 202 of the second aspect, wherein the casing 30 is arranged such that the first chamber 33 is located below the second chamber 34, and the casing 30 is provided with a first introduction hole 36 formed at an end of the first chamber 33 on one side in the first direction D1, which communicates between the outside of the casing 30 and the inside of the first chamber 33 and introduces air outside the casing 30 into the first chamber 33, and a first introduction hole 36 formed at an end of the first chamber 33 on one side in the first direction D1, which communicates between the outside of the casing 30 and the inside of the first chamber 33 and introduces air outside the casing 30 into the first chamber 33. a first exhaust hole 37 formed at an end on the other side in the direction D1, communicating the outside of the casing 30 with the inside of the first chamber 33 in the first direction D1 and discharging the air in the first chamber 33 to the outside of the casing 30; a second introduction hole 38 formed at an end on one side of the second chamber 34 in the first direction D1, communicating the outside of the casing 30 with the inside of the second chamber 34 and introducing the air outside the casing 30 into the second chamber 34; a second exhaust hole 39 formed at an end on the other side of the first direction D1 of the lower surface of the first chamber 33, communicating the outside of the casing 30 with the inside of the second chamber 34 in the vertical direction Dv and discharging the air in the second chamber 34 to the outside of the casing 30; and a third introduction hole 40 formed at an end on the other side of the first direction D1 of the lower surface of the first chamber 33, communicating the outside of the casing 30 with the inside of the first chamber 33 in the vertical direction Dv and introducing the air outside the casing 30 into the first chamber 33. is connected to the outside of the storage section 4, the second fan 25 is provided at a position overlapping with the second exhaust hole 39 in the vertical direction Dv, and the third fan 5 may include an upper fan 5a provided above the plurality of converters 20 and discharging air from within the storage section 4 upward, and a lower fan 5b provided below the plurality of converters 20 and on the other side of the first direction D1, drawing in air from outside the storage section 4 and generating an upward air flow within the storage section 4.

[0096] By driving the first fan 24, an air flow from one side to the other side in the first direction D1 is generated in the first chamber 33. This causes cold air outside the storage section 4 to be introduced into the first chamber 33 through the first inlet hole 36, pass through the heat sink 23, and be discharged from the first exhaust hole 37. By driving the second fan 25, the air within the second chamber 34 is discharged upward through the second exhaust holes 39. Moreover, the air discharged from the second exhaust hole 39 of the lower converter 20 is introduced into the end portion on the other side in the first direction D1 of the first chamber 33 of the upper converter 20 through the third introduction hole 40. As a result, an upward flow is added to the flow of air in the first chamber 33 immediately before it is discharged from the first exhaust hole 37. As a result, the air discharged from the first exhaust hole 37 is also discharged upward. For the converter 20 disposed at the bottom, the flow of air discharged from the first exhaust hole 37 is redirected upward by the lower fan 5b. In this manner, the cooled air discharged from all the converters 20 is guided upward and smoothly discharged by the upper fan 5a to the outside of the storage unit 4. This makes it possible to reduce pressure loss of the cooling air. Therefore, without using the louvers 9 and without changing the hardware configuration of each converter 20, it is possible to realize a high-density arrangement of the converters 20 while ensuring air-cooling performance, all with the same hardware configuration. Furthermore, since the lower fan 5b can suck in cool air outside the storage section 4, the temperature inside the storage section 4 can be lowered and the air-cooling performance can be improved.

[0097] (6) A sixth aspect of the conversion unit 302 is the conversion unit 302 of the second aspect, and the casing 330 is arranged so that the first chamber 33 is located below the second chamber 34. The casing 330 is formed at an end of the first chamber 33 on one side in the first direction D1, and has a first introduction hole 336 that communicates between the outside of the casing 330 and the inside of the first chamber 33 and introduces air outside the casing 330 into the first chamber 33. a first exhaust hole 337 formed at an end on the other side in the first direction D1, communicating the outside of the casing 330 with the inside of the first chamber 33 in the vertical direction Dv and discharging the air in the first chamber 33 to the outside of the casing 330; a second introduction hole 338 formed at an end on one side of the second chamber 34 in the first direction D1, communicating the outside of the casing 330 with the inside of the second chamber 34 and introducing the air outside the casing 330 into the second chamber 34; a second exhaust hole 339 formed at an end on the other side in the first direction D1, communicating the inside of the first chamber 33 and the inside of the second chamber 34 in the vertical direction Dv and discharging the air in the second chamber 34 into the first chamber 33; and a third introduction hole 340 formed at an end on the other side in the first direction D1 of the upper surface of the second chamber 34, communicating the outside of the casing 330 and the inside of the second chamber 34 in the vertical direction Dv and introducing the air outside the casing 330 into the second chamber 34. 6 is connected to the outside of the storage section 4, the second fan 25 is provided at a position overlapping with the second exhaust hole 339 in the vertical direction Dv and generates a downward flow, and the third fan 5 may include an upper fan 5a provided above the multiple converters 320 and drawing in air outside the storage section 4 downward, and a lower fan 5b provided directly below the multiple converters 320 and generating a downward air flow within the storage section 4 to exhaust the air within the storage section 4.

[0098] By driving the first fan 24, an air flow from one side to the other side in the first direction D1 is generated in the first chamber 33. This causes cold air outside the storage section 4 to be introduced into the first chamber 33 through the first inlet hole 336, pass through the heat sink 23, and be discharged from the first exhaust hole 337. By driving the second fan 25, air above the second chamber 34 is drawn in through the third inlet hole 340, and the air within the second chamber 34 is discharged downward through the second exhaust hole 339, and then discharged downward through the first exhaust hole 337 together with the air within the first chamber 33. Moreover, the air discharged from the first exhaust hole 337 of the upper converter 320 is introduced into the second chamber 34 of the lower converter 320 through the third introduction hole 340. In this manner, the cooled air is sent sequentially from the upper converter 320 to the lower converter 320. In this manner, the cooled air discharged from all the converters 320 is guided downward and smoothly discharged by the lower fan 5b to the outside of the storage unit 4. This makes it possible to reduce pressure loss of the cooling air. Therefore, without changing the hardware configuration of each converter 320, all the converters 320 have the same hardware configuration, and it is possible to realize a high-density arrangement of the converters 320 while ensuring air-cooling performance. Furthermore, since the upper fan 5a can suck in air with less dust from the upper surface of the storage section 4, the amount of dust inside the storage section 4 can be reduced. Furthermore, since the space S for circulating air on the other side of the first direction of the multiple converters 320 can be minimized, the conversion unit 302 can be designed to be compact, and therefore can be designed with even higher density.

[0099] (7) A storage board 1, 101, 201, 301 of the seventh aspect includes a conversion unit 2, 102, 202, 302 of any one of the second to sixth aspects. [Explanation of symbols]

[0100] 1...Storage panel 2...Conversion unit 3...Control section 4...Storage section 4a...Frame 4b...Horizontal column 4c...Support column 4c1...First support column 4c2...Second support column 5...Third fan 6...Electrode section inside panel 7...Duct 8...First filter 9...Louver 10...Frame body 11...Female connector 20...Converter 21...Power module 22...Male connector 23...Heat sink 23a...Fin 24...First fan 25...Second fan 26...Mounting piece 30...Casing 31...Casing body 32...Partition wall 33...First chamber 34...Second chamber 35...Mounting hole 36...First inlet hole 37...First exhaust hole 38...Second inlet hole 39...Second exhaust hole 40...Third inlet hole Dv...Up-down direction D1...First direction D2...Second direction REFERENCE SIGNS LIST 101... storage board 102... conversion unit 120... converter 130... casing 131... casing body 136... first inlet 137... first outlet 138... second inlet 139... second outlet 201: Storage panel 202: Conversion unit 215: Partition plate 216: Flow path 217: Panel inner plate 218: Second filter 5a: Upper fan 5b: Lower fan S: Space 301: Storage board 302: Conversion unit 320: Converter 330: Casing 331: Casing body 336: First inlet hole 337: First outlet hole 338: Second inlet hole 339: Second outlet hole 340: Third inlet hole

Claims

1. a casing having a first chamber and a second chamber vertically partitioned; A power module disposed in the second chamber; a heat sink disposed in the first chamber and thermally connected to the power module; a first fan attached to the casing, which generates a flow in a first direction that introduces air outside the casing into the first chamber from one side of a first direction perpendicular to the up-down direction and discharges air in the first chamber to the outside of the casing or into the second chamber from the other side of the first direction; a second fan attached to the casing and configured to generate a vertical flow that introduces air outside the casing into the second chamber from one side in the first direction and discharges air in the second chamber to the outside of the casing from the other side in the first direction; A converter comprising:

2. A plurality of the converters according to claim 1 arranged in a vertical direction; A storage section that stores the plurality of converters; a third fan attached to the storage section and configured to vertically exhaust air from the storage section to the outside of the storage section; Equipped with The first fan is a conversion unit that introduces air outside the storage section into the first room.

3. The casing is disposed such that the first chamber is located below the second chamber, The casing comprises: a first introduction hole formed at an end of the first chamber on one side in the first direction, communicating the outside of the casing with the inside of the first chamber and introducing air outside the casing into the first chamber; a first exhaust hole formed at an end of the first chamber on the other side in the first direction, communicating the outside of the casing with the inside of the first chamber in the first direction and exhausting air in the first chamber to the outside of the casing; a second introduction hole formed at an end of the second chamber on one side in the first direction, communicating the outside of the casing with the inside of the second chamber and introducing air outside the casing into the second chamber; a second exhaust hole formed at an end of an upper surface of the second chamber on the other side in the first direction, which connects the outside of the casing with the inside of the second chamber in the vertical direction and exhausts air in the second chamber to the outside of the casing; a third introduction hole formed at an end portion of a lower surface of the first chamber on the other side in the first direction, which communicates the outside of the casing with the inside of the first chamber in the vertical direction and introduces air outside the casing into the first chamber; having The first introduction hole communicates with the outside of the storage portion, the second fan is provided at a position overlapping with the second exhaust hole in the vertical direction and generates an upward flow; the third fan is provided above the plurality of converters and discharges air from within the storage section upward; The conversion unit as described in claim 2, further comprising a louver arranged on the other side of the first direction with respect to the first exhaust hole of the converter arranged at the lowest position, inclined so as to be gradually positioned upward as it moves from one side to the other side in the first direction, and redirecting the flow of air discharged from the first exhaust hole upward.

4. The casing is disposed such that the first chamber is located above the second chamber, The casing comprises: a first introduction hole formed at an end of the first chamber on one side in the first direction, communicating the outside of the casing with the inside of the first chamber and introducing air outside the casing into the first chamber; a first exhaust hole formed at an end of the first chamber on the other side in the first direction, communicating the outside of the casing with the inside of the first chamber in the vertical direction and the first direction, and exhausting air in the first chamber to the outside of the casing; a second introduction hole formed at an end of the second chamber on one side in the first direction, communicating the outside of the casing with the inside of the second chamber and introducing air outside the casing into the second chamber; a second exhaust hole formed at an end portion of an upper surface of the second chamber on the other side in the first direction, which communicates the first chamber and the second chamber in the up-down direction and exhausts air in the second chamber into the first chamber; having The first introduction hole communicates with the outside of the storage portion, the second fan is provided at a position overlapping with the second exhaust hole in the vertical direction and generates an upward flow; The conversion unit according to claim 2 , wherein the third fan is provided above the plurality of converters and discharges air from within the storage section upward.

5. The casing is disposed such that the first chamber is located below the second chamber, The casing comprises: a first introduction hole formed at an end of the first chamber on one side in the first direction, communicating the outside of the casing with the inside of the first chamber and introducing air outside the casing into the first chamber; a first exhaust hole formed at an end of the first chamber on the other side in the first direction, communicating the outside of the casing with the inside of the first chamber in the first direction and exhausting air in the first chamber to the outside of the casing; a second introduction hole formed at an end of the second chamber on one side in the first direction, communicating the outside of the casing with the inside of the second chamber and introducing air outside the casing into the second chamber; a second exhaust hole formed at an end of an upper surface of the second chamber on the other side in the first direction, which connects the outside of the casing with the inside of the second chamber in the vertical direction and exhausts air in the second chamber to the outside of the casing; a third introduction hole formed at an end portion of a lower surface of the first chamber on the other side in the first direction, which communicates the outside of the casing with the inside of the first chamber in the vertical direction and introduces air outside the casing into the first chamber; having The first introduction hole communicates with the outside of the storage portion, The second fan is provided at a position overlapping with the second exhaust hole in the vertical direction, 3. The conversion unit of claim 2, wherein the third fan includes an upper fan disposed above the plurality of converters and discharging air within the storage section upward, and a lower fan disposed below the plurality of converters and on the other side of the first direction, drawing in air from outside the storage section and generating an upward air flow within the storage section.

6. The casing is disposed such that the first chamber is located below the second chamber, The casing comprises: a first introduction hole formed at an end of the first chamber on one side in the first direction, communicating the outside of the casing with the inside of the first chamber and introducing air outside the casing into the first chamber; a first exhaust hole formed at an end portion of a lower surface of the first chamber on the other side in the first direction, which connects the outside of the casing to the inside of the first chamber in the vertical direction and exhausts air in the first chamber to the outside of the casing; a second introduction hole formed at an end of the second chamber on one side in the first direction, communicating the outside of the casing with the inside of the second chamber and introducing air outside the casing into the second chamber; a second exhaust hole formed at an end portion of a lower surface of the second chamber on the other side in the first direction, which communicates the first chamber and the second chamber in the up-down direction and exhausts air from the second chamber into the first chamber; a third introduction hole formed at an end of an upper surface of the second chamber on the other side in the first direction, which communicates the outside of the casing with the inside of the second chamber in the vertical direction and introduces air outside the casing into the second chamber; having The first introduction hole communicates with the outside of the storage portion, the second fan is provided at a position overlapping with the second exhaust hole in the vertical direction and generates a downward flow; 3. The conversion unit of claim 2, wherein the third fan includes an upper fan disposed above the plurality of converters and drawing in air outside the storage section downward, and a lower fan disposed directly below the plurality of converters and generating a downward air flow within the storage section to exhaust air within the storage section.

7. A storage board comprising a conversion unit according to any one of claims 2 to 6.

Images