Distribution panel

Abstract

To effectively cool a high heat generation component while suppressing an increase in manufacturing cost.SOLUTION: A distribution board comprises: an electric converter that is housed in a casing; a suction port and an exhaust port; a fan that flows an air into the casing from the suction port to the exhaust port; a first separation part that is divided by a first region where a low heat generation component is arranged in the casing and a second region where the low heat generation component is arranged; and a second separation part that is arranged to a downstream side from the first separation part and divides the second region into an inner region where the high heat generation component is arranged and an outer region where the high heat generation component is not arranged. The first separation part includes: a first inlet that makes an air in the casing import into the first region; and a first outlet that makes an air flowing in the first region export to the second region. The second separation part includes: a second inlet that is opposite to the first outlet in a state of having an interval from the first outlet; and a second outlet for making the air flowing in the inner region exporting to the external region, in which a flow channel cross sectional area in the inner region is formed so as to be gradually increased from the second inlet to the second outlet.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a switchboard.

Background Art

[0002] For example, in Patent Document 1, there is disclosed a switchboard device having a first ventilation path in which some of the high heat-generating components are arranged inside, and a second ventilation path in which some other high heat-generating components are arranged inside, in a state independent of the first ventilation path. This high heat-generating component is a power conversion component in the switchboard device. The heat generated from the high heat-generating components in the first ventilation path and the second ventilation path is removed by driving the first fan and the second fan respectively.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, in the field of switchboard devices, there has been an increasing trend towards higher voltage, larger current, higher frequency, and faster switching in order to improve added value. Along with this, there is a demand for a technology to efficiently cool high heat-generating components such as fuses used in switchboard devices. In the technology described in Patent Document 1, since a plurality of mutually independent ventilation paths are formed, the structure for cooling high heat-generating components becomes complicated. Also, it is necessary to provide a fan for each ventilation path. As a result, the cost of manufacturing the switchboard device may increase.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a switchboard that can efficiently cool high heat-generating components while suppressing an increase in manufacturing cost.

Means for Solving the Problems

[0006] To solve the above problems, the power distribution panel according to the present disclosure comprises a casing, a power converter housed in the casing and converting power supplied from the outside, an air intake port into which outside air can be introduced into the casing, an exhaust port into which the air inside the casing can be discharged to the outside of the casing, a fan capable of directing the air introduced into the casing from the air intake port toward the exhaust port, a first partition portion that divides the space inside the casing into a first region where low-heat generating components electrically connected to the power converter are arranged and a second region where the low-heat generating components are not arranged, and a second partition portion that is located downstream of the first partition portion in the direction of airflow and divides the second region into an inner region where high-heat generating components electrically connected to the power converter and the low-heat generating components are arranged and an outer region where the high-heat generating components are not arranged, wherein the first partition portion is located through the air intake port The aforementioned The casing has a first inlet opening for introducing the air into the first region, and a first outlet opening for discharging the air that has flowed through the first region to the second region. The second partition has a second inlet opening that is spaced apart from the first outlet opening and faces the first outlet opening in the direction of airflow, and a second outlet opening for discharging the air that has flowed through the inner region to the outer region. The second partition is formed such that the cross-sectional area of ​​the flow path in the inner region increases from the second inlet opening towards the second outlet opening. The plate-shaped portion of the second partition is inclined with respect to the center line connecting the center of the second inlet opening and the center of the second outlet opening. It is. Furthermore, in order to solve the above problems, the power distribution panel according to this disclosure includes a casing, a power converter housed in the casing and converting power supplied from the outside, an air intake port into which air from outside the casing can be introduced into the casing, an exhaust port into which the air inside the casing can be discharged to the outside of the casing, a fan that can direct the air introduced into the casing from the air intake port towards the exhaust port, a first partition that divides the space inside the casing into a first region where low-heat generating components electrically connected to the power converter are arranged and a second region where the low-heat generating components are not arranged, and a high-heat generating component arranged downstream of the first partition in the direction of airflow, which electrically connects the power converter and the low-heat generating components to the second region. The casing comprises a first partition that divides an inner region where the high-heat-generating component is arranged into an outer region where the high-heat-generating component is not arranged, the first partition having a first inlet opening that allows the air introduced into the casing through the intake port to flow into the first region, and a first outlet opening that allows the air that has flowed through the first region to flow out to the second region, the second partition having a second inlet opening that is spaced apart from the first outlet opening and faces the first outlet opening in the direction of airflow, and a second outlet opening that allows the air that has flowed through the inner region to flow out to the outer region, the second partition is formed such that the flow path cross-sectional area of ​​the inner region increases from the second inlet opening to the second outlet opening, and the second inlet opening and the second outlet opening are circular in shape. [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide a power distribution board that can efficiently cool high-heat-generating components while suppressing increases in manufacturing costs. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view of a power distribution panel showing the configuration of a power distribution panel according to an embodiment of this disclosure. [Figure 2] This is an enlarged view of the main part in Figure 1. [Modes for carrying out the invention]

[0009] The following describes the configuration for implementing the power distribution panel according to this disclosure, with reference to the attached drawings.

[0010] [Switchboard] The switchboard in this embodiment is a marine switchboard that converts electricity within the hull of a ship. Multiple switchboards are arranged in the equipment room or other areas within the ship's hull. As shown in Figure 1, the switchboard 100 comprises a casing 1, a power converter 2, an air intake 3, an exhaust vent 4, a fan 5, a first partition 6, a low-heat generating component 7, a second partition 8, and a high-heat generating component 9. Note that in Figure 1, only one of the multiple switchboards 100 is shown.

[0011] (Casing) Casing 1 forms the outer shell of the distribution panel 100. Casing 1 is made of, for example, metal. Casing 1 is placed on the floor surface Fs inside the equipment room. In this embodiment, casing 1 is a rectangular parallelepiped that extends in a vertical direction Dv perpendicular to the direction in which the floor surface Fs widens, defining a space inside which equipment can be housed.

[0012] For the sake of explanation, the direction in which the casing 1 extends will be referred to as the "vertical direction Dv". In this case, the upper side in the vertical direction Dv will be simply referred to as the "upper side Dvu", and the opposite side, the lower side, will be simply referred to as the "lower side Dvd". The casing 1 has an inner surface 10 composed of multiple surfaces.

[0013] Of the multiple surfaces that make up the inner surface 10, the surface located at the uppermost Dvu and facing downward Dvd is called the "top surface 11," and the surface located at the lowermost Dvd and opposite to the top surface 11 is called the "bottom surface 12." The top surface 11 and the bottom surface 12 are, for example, parallel to each other. The four surfaces connecting these top surface 11 and bottom surface 12 are called the "side surfaces 13." In Figure 1, due to space limitations, only two of the four side surfaces 13 that are parallel to each other and facing each other are shown.

[0014] (Power converter) The power converter 2 is a device that converts power input from a power source (not shown) located inside the ship's hull outside the casing 1, and outputs the converted power to the outside of the casing 1. Multiple power converters 2 are housed in the casing 1. Figure 1 shows an example where five power converters 2 are housed in the casing 1. These power converters 2 are cooled by a liquid coolant supplied from the outside.

[0015] (Air intake) The intake port 3 is a hole that allows outside air from the casing 1 to be introduced into the casing 1. Therefore, the intake port 3 connects the space outside the casing 1 with the space inside the casing 1. The intake port 3 is located inside the casing 1. In this specification, "inside the casing 1" means that it is formed in the casing 1 so as to extend across the inner surface 10 and the outer surface of the casing 1, rather than being inside the casing 1.

[0016] Multiple air intake ports 3 are formed in the casing 1 so as to penetrate from the side surface 13 of the casing 1 toward the outer surface. That is, multiple air intake ports 3 are arranged in the direction in which the side surface 13 of the casing 1 widens. In Figure 1, for the sake of space, only one of the multiple air intake ports 3 is shown. In this embodiment, the air intake port 3 penetrates from the lower part of the side surface 13 of the casing 1, which is close to the bottom surface 12, toward the outer surface.

[0017] (Exhaust vent) The exhaust port 4 is a hole capable of discharging the air inside the casing 1 to the outside of the casing 1. Therefore, the exhaust port 4 communicates the space outside the casing 1 and the space inside the casing 1. The exhaust port 4 is disposed in the casing 1. The exhaust port 4 in the present embodiment is formed in the casing 1 so as to penetrate from the top surface 11 of the casing 1 toward the outer surface.

[0018] (Fan) The fan 5 is a blower capable of flowing the air introduced into the casing 1 through the intake port 3 from the intake port 3 toward the exhaust port 4. The fan 5 is housed in the casing 1. The fan 5 in the present embodiment is provided on the top surface 11 of the casing 1 and is disposed in the vicinity of the exhaust port 4.

[0019] When the fan 5 is driven, air is introduced into the casing 1 from the outside through the intake port 3. The air introduced into the casing 1 flows toward the upper side Dvu and is discharged to the outside of the casing 1 through the exhaust port 4.

[0020] (First partition part) The first partition part 6 is a member that partitions the space inside the casing 1 into a first region R1 and a second region R2. The first partition part 6 is formed of, for example, metal or the like. The first partition part 6 is housed in the casing 1. The first partition part 6 in the present embodiment forms a cylindrical shape extending in the vertical direction Dv when housed in the casing 1. The first partition part 6 is disposed on the upper side Dvu rather than the intake port.

[0021] The first region R1 generated by disposing the first partition part 6 in the casing 1 corresponds to the space inside the first partition part 6. The second region R2 generated by disposing the first partition part 6 in the casing 1 corresponds to the space outside the first partition part 6. The power converter 2 and the fan 5 are disposed in this second region R2. Here, the first partition part 6 has a first inlet opening 61 and a first outlet opening 62.

[0022] The first inlet opening 61 allows a portion of the air introduced into the casing 1 through the intake port 3 to flow into the first region R1. The first inlet opening 61 faces downward Dvd and is opposite the bottom surface 12. The first inlet opening 61 is circular in shape. The first outlet opening 62 allows the air that has flowed through the first region R1 to flow out into the second region R2, which is above the first partition 6 on the Dvu side. The first outlet opening 62 faces upward Dvu and is opposite the top surface 11. The first outlet opening 62 is circular in shape.

[0023] The first region R1 between the first inlet opening 61 and the first outlet opening 62 has a uniformly formed flow path cross-sectional area. Here, "uniform" means that it is substantially uniformly formed, and slight manufacturing errors and design tolerances are permitted. The inner circumferential surface of the first partition 6 is cylindrical. Air inside the casing 1 that does not flow into the first region R1 flows through the second region R2 around the first partition 6 along the outer circumferential surface of the first partition 6 toward the upward side Dvu.

[0024] (Low heat generation components) The low-heat-generating component 7 is a component electrically connected to the power converter 2. The low-heat-generating component 7 is housed in the casing 1. The low-heat-generating component 7 generates heat when the power converter 2 is driven. In this embodiment, the low-heat-generating component 7 may be, for example, a terminal block connected to the positive and negative terminals of the power converter 2 by busbars or the like.

[0025] The low-heat generating component 7 is located in the first region R1 defined by the first partition 6. In other words, the low-heat generating component 7 is housed within the first partition 6. Therefore, the low-heat generating component 7 is located in the first region R1, but not in the second region R2. In Figure 1, the electrical connection between the low-heat generating component 7 and the power converter 2 is conceptually shown by a dashed line.

[0026] (Second partition section) The second partition 8 is a member that divides the second region R2 within the casing 1 into an inner region Ri and an outer region Ro. The second partition 8 is formed of, for example, metal. The second partition 8 is housed in the casing 1. In this embodiment, when housed in the casing 1, the second partition 8 is formed into a cylindrical shape with a frustoconical shape extending in the vertical direction Dv.

[0027] The second partition 8 is located downstream of the first partition 6 in the direction of airflow within the casing 1. That is, in this embodiment, the second partition 8 is located above the first partition 6, on the Dvu side.

[0028] The inner region Ri, created by the placement of the second partition 8 within the casing 1, corresponds to the space inside the second partition 8. The outer region Ro, created by the placement of the second partition 8 within the casing 1, corresponds to the space outside the second partition 8. The power converter 2 and the fan 5 are located in the outer region Ro of the second region R2. Here, the second partition 8 has a second inlet opening 81 and a second outlet opening 82.

[0029] The second inlet opening 81 allows air that has flowed out from the first region R1 through the first outlet opening 62, and a portion of the air that flows upward towards the upper side Dvu in the second region R2 surrounding the first partition 6, to flow into the inner region Ri. The second inlet opening 81 faces downward towards Dvd and is opposite the bottom surface 12 and the first inlet opening 61. The second inlet opening 81 is circular in shape. The second outlet opening 82 allows air that has flowed through the inner region Ri to flow out into the outer region Ro above the second partition 8 towards the upper side Dvu. The second outlet opening 82 faces upward towards Dvu and is opposite the top surface 11. The second outlet opening 82 is circular in shape.

[0030] The inner region Ri between the second inlet opening 81 and the second outlet opening 82 is formed such that the flow path cross-sectional area increases from the second inlet opening 81 towards the second outlet opening 82. In other words, the second partition 8 is formed such that the flow path cross-sectional area of ​​the inner region Ri gradually increases from the second inlet opening 81 towards the second outlet opening 82. The inner circumferential surface of the second partition 8 is funnel-shaped. Air in the casing 1 that does not flow into the inner region Ri flows in the outer region Ro around the second partition 8 along the outer circumferential surface of the second partition 8 toward the upper side Dvu.

[0031] Here, as shown in Figure 2, the second inlet opening 81 is formed with an opening area larger than that of the first outlet opening 62. Therefore, the inner diameter L2 of the second inlet opening 81 is larger than the inner diameter L1 of the first inlet opening 61. Also, the inner diameter L3 of the second outlet opening 82 is larger than the inner diameter L2 of the second inlet opening 81.

[0032] (High-heat generating components) The high-heat-generating component 9 is a component electrically connected to the power converter 2 and the low-heat-generating component 7. The high-heat-generating component 9 is housed in the casing 1. The high-heat-generating component 9 generates more heat than the low-heat-generating component 7 when the power converter 2 is driven. Examples of the high-heat-generating component 9 in this embodiment include circuit elements such as a fuse for the power converter 2 placed in the current path connecting the power converter 2 and the low-heat-generating component 7, and a fuse (bustie fuse) placed in the current path extending from the low-heat-generating component 7 toward another distribution panel 100.

[0033] The heat-generating component 9 is located in the inner region Ri defined by the second partition 8. In other words, the heat-generating component 9 is housed in the second partition 8. Specifically, the heat-generating component 9 is located near the second inlet opening 81 in the inner region Ri. Here, "near the second inlet opening 81" means, for example, the lower half of the inner region Ri when the second partition 8 is divided in the vertical direction Dv.

[0034] Therefore, the high-heat-generating component 9 is located in the inner region Ri, while the high-heat-generating component 9 is not located in the outer region Ro. In Figure 1, the electrical connection between the high-heat-generating component 9 and the power converter 2 and low-heat-generating component 7 is conceptually shown by a dashed line.

[0035] (Effects and Benefits) In the above configuration, the flow path cross-sectional area of ​​the inner region Ri increases as it moves towards the upper side Dvu. Therefore, when the fan 5 is driven and air flows through the inner region Ri, this air depressurizes and expands within the inner region Ri. As a result, the air pressure in the inner region Ri becomes lower than the air pressure in the outer region Ro, and the airflow velocity in contact with the high-heat-generating component 9 located in the inner region Ri increases compared to the airflow velocity in the outer region Ro. In addition, air flowing out from the first region R1 through the first outlet opening 62 and a portion of the air flowing from the outer region Ro below the second partition 8 towards the upper side Dvu are guided into the inner region Ri through the second inlet opening 81. That is, air with a lower temperature than the air flowing through the first region R1 can be taken into the inner region Ri. Through these actions, the high-heat-generating component 9 is efficiently cooled. Furthermore, there is no need to add a fan 5 or the like to increase the airflow velocity in contact with the high-heat-generating component 9. Furthermore, the above function can be achieved with a simple configuration, such as arranging the first partition section 6 and the second partition section 8 within the casing 1. Therefore, the high-heat-generating components 9 can be efficiently cooled while suppressing an increase in the manufacturing cost of the power distribution board 100.

[0036] Furthermore, according to the above configuration, the high-heat-generating component 9 is positioned in a Dvu above the low-heat-generating component 7. As a result, the heat generated from the high-heat-generating component 9, and the air that has exchanged heat with the high-heat-generating component 9, move to a Dvu above the high-heat-generating component 9, and therefore do not reach the low-heat-generating component 7. Consequently, compared to, for example, the case where the low-heat-generating component 7 is positioned in a Dvu above the high-heat-generating component 9, the low-heat-generating component 7 is not affected by the heat from the high-heat-generating component 9. As a result, the low-heat-generating component 7 can be cooled efficiently.

[0037] Furthermore, in equipment rooms and other areas within the ship's hull, the available space for installing the power distribution panel 100 may be limited. With the above configuration, the low-heat generating component 7 and the high-heat generating component 9 are air-cooled while arranged in the vertical direction Dv. Therefore, compared to, for example, the case where these are arranged inside the casing 1 in a direction parallel to the floor surface Fs, the space occupied by the power distribution panel 100 in the direction parallel to the floor surface Fs can be reduced.

[0038] Furthermore, with the above configuration, the opening area of ​​the second inlet opening 81, which is opposite the first outlet opening 62, is larger than the opening area of ​​the first outlet opening 62. Therefore, the air flowing out from the first region R1 can be smoothly guided to the inner region Ri. Consequently, the momentum of the air whose flow velocity has increased in the first region R1 can be efficiently utilized, and the flow velocity of the air guided to the inner region Ri increases. As a result, the high-heat-generating component 9 can be cooled more efficiently.

[0039] Furthermore, with the above configuration, since the second inlet opening 81 is circular in shape, the air flowing in the outer region Ro around the first partition 6 can be smoothly guided to the inner region Ri. Also, since the second outlet opening 82 is circular in shape, compared to the case where the second outlet opening 82 has other shapes, air can be smoothly discharged from the inner region Ri to the upper side Dvu. As a result, the high-heat generating component 9 can be cooled more efficiently.

[0040] (Other embodiments) Although embodiments of this disclosure have been described in detail above with reference to the drawings, the specific configurations are not limited to those of each embodiment, and additions, omissions, substitutions, and other modifications to the configurations are possible without departing from the gist of this disclosure.

[0041] In the above embodiment, the first partition 6 is described as being cylindrical in shape and extending in the vertical direction Dv, but the configuration is not limited to this. Although detailed illustrations are omitted, the first partition 6 may be, for example, plate-shaped and, together with the side surface 13 on the inner surface 10 of the casing 1, divide the space inside the casing 1 into a first region R1 where the low-heat-generating component 7 is placed and a second region R2 where the low-heat-generating component 7 is not placed. Therefore, the first inlet opening 61 and the first outlet opening 62 are not limited to a circular shape, but may be polygonal in shape such as a rectangle.

[0042] Furthermore, although the above embodiment describes a configuration in which the second partition portion 8 is formed in a frustoconical shape extending in the vertical direction Dv, the configuration is not limited to this. Although detailed illustrations are omitted, the second partition portion 8 may, for example, be plate-shaped and, together with the side surface 13 of the inner surface 10 of the casing 1, divide the second region R2 into an inner region Ri where the high-heat-generating component 9 is located and an outer region Ro where the high-heat-generating component 9 is not located. Therefore, the second inlet opening 81 and the second outlet opening 82 are not limited to a circular shape, but may also be polygonal in shape, such as a rectangle.

[0043] Furthermore, although the above embodiment describes a configuration in which the first partition 6 and the second partition 8 are made of metal, the configuration is not limited to this. The first partition 6 and the second partition 8 may be made of, for example, synthetic resin.

[0044] Furthermore, although the above embodiment describes a configuration in which the air intake port 3 is formed in the casing 1 so as to penetrate from the side surface 13 on the inner surface 10 of the casing 1 toward the outer surface, the configuration is not limited to this. The air intake port 3 may be formed in the casing 1 so as to penetrate from the bottom surface 12 on the inner surface 10 of the casing 1 toward the floor surface Fs. In this case, the casing 1 is supported by, for example, a frame (not shown) placed on the floor surface Fs, and there should be a gap between the casing 1 and the floor surface Fs through which air can flow.

[0045] Furthermore, although the above embodiment described a case in which five power converters 2 are housed in the casing 1, it is not limited to five. A configuration in which four or fewer, or six or more, power converters 2 are housed in the casing 1 is also possible.

[0046] Furthermore, although the above embodiment describes a configuration in which the power converter 2 is cooled by a liquid coolant supplied from the outside, it is not limited to a liquid coolant. The power converter 2 may be cooled by, for example, air cooling. Specifically, the power converter 2 may be cooled by air introduced into the casing 1 from the air intake port 3.

[0047] Furthermore, although the above embodiment describes a configuration in which the opening area of ​​the second inlet opening 81 is larger than the opening area of ​​the first outlet opening 62, the configuration is not limited to this. The opening area of ​​the second inlet opening 81 may be the same as the opening area of ​​the first outlet opening 62. Therefore, the inner diameter L2 of the second inlet opening 81 may be the same as the inner diameter L1 of the first inlet opening 61. Therefore, the opening area of ​​the second inlet opening 81 only needs to be greater than or equal to the opening area of ​​the first outlet opening 62. This also allows the above-mentioned effects to be achieved. Furthermore, the inner diameter L3 of the second outlet opening 82 may be the same as the inner diameter L2 of the second inlet opening 81.

[0048] Furthermore, the power distribution panel 100 described in the above embodiment is not limited to a marine power distribution panel that converts electricity within the hull of a ship, but may also be a power distribution panel used in facilities such as power plants that require power conversion.

[0049] <Note> The power distribution panel described in the embodiment can be understood, for example, as follows:

[0050] (1) The switchboard 100 according to the first embodiment includes a casing 1, a power converter 2 housed in the casing 1 and converting power supplied from the outside, an air intake 3 into which outside air can be introduced into the casing 1, an exhaust port 4 into which the air inside the casing 1 can be discharged to the outside of the casing 1, a fan 5 that can direct the air introduced into the casing 1 from the air intake 3 towards the exhaust port 4, a first partition 6 that divides the space inside the casing 1 into a first region R1 where low-heat generating components 7 electrically connected to the power converter 2 are arranged, and a second region R2 in which the low-heat generating components 7 are not arranged, and a high-heat generating component 6 located downstream of the first partition 6 in the direction of airflow that electrically connects the second region R2 to the power converter 2 and the low-heat generating components 7. The casing includes a second partition 8 that divides the casing into an inner region Ri where a heat component 9 is located and an outer region Ro where the heat-generating component 9 is not located. The first partition 6 has a first inlet opening 61 that allows the air introduced into the casing 1 through the intake port 3 to flow into the first region R1, and a first outlet opening 62 that allows the air that has flowed through the first region R1 to flow out to the second region R2. The second partition 8 has a second inlet opening 81 that is spaced apart from the first outlet opening 62 and faces the first outlet opening 62 in the direction of airflow, and a second outlet opening 82 that allows the air that has flowed through the inner region Ri to flow out to the outer region Ro. The second partition 8 is formed such that the flow path cross-sectional area of ​​the inner region Ri increases from the second inlet opening 81 towards the second outlet opening 82.

[0051] As a result, the air pressure in the inner region Ri is lower than that in the outer region Ro, causing the airflow velocity in contact with the heat-generating component 9 located in the inner region Ri to increase compared to the airflow velocity in the outer region Ro. Furthermore, air flowing out from the first region R1 and air from the outer region Ro, which is at a lower temperature than the air flowing through the first region R1, are introduced into the inner region Ri through the second inlet opening 81. Therefore, the heat-generating component 9 can be cooled efficiently. Moreover, the above effect can be achieved with a simple configuration, such as arranging the first partition 6 and the second partition 8 within the casing 1, without the need to add a fan 5 or the like.

[0052] (2) The switchboard 100 according to the second embodiment is the switchboard 100 of (1), wherein the opening area of ​​the second inlet opening 81 may be equal to or greater than the opening area of ​​the first outlet opening 62.

[0053] This allows the air flowing out from the first region R1 to be smoothly guided to the inner region Ri. Consequently, the momentum of the air whose flow velocity has increased in the first region R1 can be efficiently utilized, resulting in an increase in the flow velocity of the air guided to the inner region Ri.

[0054] (3) The switchboard 100 according to the third embodiment is the switchboard 100 of (1) or (2), wherein the second inlet opening 81 and the second outlet opening 82 may be circular in shape.

[0055] This allows the air flowing in the outer region Ro around the first partition 6 to be smoothly guided to the inner region Ri, and also allows the air to flow smoothly out from the inner region Ri to the upper side Dvu. [Explanation of Symbols]

[0056] 1…Casing 2…Power converter 3…Intake port 4…Exhaust port 5…Fan 6…First partition 7…Low heat generation component 8…Second partition 9…High heat generation component 10…Inner surface 11…Top surface 12…Bottom surface 13…Side surface 61…First inlet opening 62…First outlet opening 81…Second inlet opening 82…Second outlet opening 100…Distribution board Dv…Up and down direction Dvd…Downward side Dvu…Upward side Fs…Floor surface L1…Inner diameter of first outlet opening L2…Inner diameter of second inlet opening L3…Inner diameter of second outlet opening R1…First region R2…Second region Ri…Inner region Ro…Outer region

Claims

1. Casing and, A power converter housed in the aforementioned casing converts power supplied from an external source, An air intake port that allows external air to be introduced into the casing, An exhaust port is provided that allows the air inside the casing to be discharged to the outside of the casing. A fan capable of directing the air introduced into the casing from the intake port toward the exhaust port, The space within the casing is divided into a first area where low-heat generating components electrically connected to the power converter are arranged, and a second area where the low-heat generating components are not arranged, by a first partition. A second partition is located downstream of the first partition in the direction of airflow, and divides the second region into an inner region where high-heat-generating components electrically connected to the power converter and the low-heat-generating components are located, and an outer region where the high-heat-generating components are not located. Equipped with, The aforementioned first partition section is, A first inlet opening that allows the air introduced into the casing through the air intake to flow into the first region, A first outlet opening that allows the air that has flowed through the first region to flow out to the second region, It has, The aforementioned second partition section is, A second inlet opening is provided, spaced apart from the first outlet opening, and facing the first outlet opening in the direction of airflow. A second outlet opening that allows the air that has flowed through the inner region to flow out to the outer region, It has, The second partition is formed such that the flow path cross-sectional area of ​​the inner region increases from the second inlet opening towards the second outlet opening. The plate-like portion of the second partition is inclined with respect to the center line connecting the center of the second inlet opening and the center of the second outlet opening in this distribution panel.

2. Casing and, A power converter housed in the aforementioned casing converts power supplied from an external source, An air intake port that allows external air to be introduced into the casing, An exhaust port is provided that allows the air inside the casing to be discharged to the outside of the casing. A fan capable of directing the air introduced into the casing from the intake port toward the exhaust port, The space within the casing is divided into a first area where low-heat generating components electrically connected to the power converter are arranged, and a second area where the low-heat generating components are not arranged, by a first partition. A second partition is located downstream of the first partition in the direction of airflow, and divides the second region into an inner region where high-heat-generating components electrically connected to the power converter and the low-heat-generating components are located, and an outer region where the high-heat-generating components are not located. Equipped with, The aforementioned first partition section is, A first inlet opening that allows the air introduced into the casing through the air intake to flow into the first region, A first outlet opening that allows the air that has flowed through the first region to flow out to the second region, It has, The aforementioned second partition section is, A second inlet opening is provided, spaced apart from the first outlet opening, and facing the first outlet opening in the direction of airflow. A second outlet opening that allows the air that has flowed through the inner region to flow out to the outer region, It has, The second partition is formed such that the flow path cross-sectional area of ​​the inner region increases from the second inlet opening towards the second outlet opening. The aforementioned second inlet opening and the aforementioned second outlet opening are circular in shape in the distribution panel.

3. The power distribution board according to claim 1 or 2, wherein the high-heat generating component is positioned closer to the second inlet opening than to the second outlet opening in the direction of airflow.

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