Power conversion device

Abstract

The present invention provides a power conversion device, the cover of which can be easily attached and detached. This power conversion device is equipped with: a power unit for converting power; a fan for cooling the power unit; a plate-like guide part having at least one cutout part in a peripheral edge section, and also having a passage part connected to the cutout part; a housing which has the power unit, a power supply for driving the fan, a connector for relaying a power supply cable for supplying power to the fan, the guide part, and an opening part; a locking member which moves along the cutout part and the passage part of the guide part while being suspended inside the housing, and can be supported at an arbitrary position of the cutout part and the passage part of the guide part; a duct which has a square cylinder shape, has one of the opening parts of the square cylinder blocked by the fan, allows air used for cooling by the fan to pass through the inside of the square cylinder, and has at least one locking member on an upper surface of the square cylinder; and a detachable cover which has the fan and the duct, and blocks the opening part of the housing.

Description

Power converter

[0001] This disclosure relates to a power conversion device.

[0002] In recent years, power conversion devices have been used in auxiliary power supply systems for train stations, which detect the rise in overhead line voltage due to the excess regenerative energy of trains, convert the DC overhead line voltage to AC, and supply it to station loads. Power conversion in power conversion devices is performed by semiconductors equipped with converters and inverters. Semiconductors generate a lot of heat during power conversion. Therefore, cooling devices such as fans are generally attached to semiconductors that perform power conversion. On the other hand, as a fan maintenance structure that is easy to work with in a motor drive device, for example, Patent Document 1 discloses a motor drive device in which a mounting hole for attaching a fan unit is closed by a fan fixing member. Patent Document 1 discloses a motor drive device comprising a mounting member in which a mounting hole is formed, a fan unit having a fan that can be placed through the mounting hole and a fan fixing member that supports the fan, and a regulating member disposed on the mounting member that restricts the movement of the fan fixing member away from the mounting hole, wherein the regulating member has a fixing member fitting portion that fits into the fan fixing member, and the fan unit is fixed to the mounting member by fastening a fastening member to the mounting member while the fan fixing member is fitted into the fixing member fitting portion. The fan fixing member functions as a support for the fan, and also as a cover that seals the mounting hole when the fan is installed.

[0003] Japanese Patent Publication No. 2017-216355

[0004] In a configuration where the cover of the housing of a power conversion device is integrated with a fan, the size of the cover becomes large and the weight becomes heavy. Therefore, when removing the cover for maintenance, it is difficult for one person to remove the cover, and two or more people are required to remove the cover, or a machine such as a lifter is used to remove the cover. Also, since the power cable of the fan integrated with the cover is connected to the power connector inside the housing, when removing the cover from the housing, the cover, which is heavy within the range of the extra length of the power cable, is removed from the housing so as not to damage the power cable or the like, and after removing the power cable from the power connector inside the housing while supporting the cover, it is necessary to completely remove the cover from the housing. As described above, in a conventional power conversion device in which the cover of the housing and the fan are integrated, there is a problem that the weight of the cover is large, the procedure for attaching and detaching the cover is complicated, and the maintainability is low.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a power conversion device in which the cover can be easily attached and detached.

[0006] The power conversion device according to the present disclosure includes a power unit that converts power, a fan that cools the power unit, a plate-shaped guide unit having at least one notch portion at a peripheral portion and a passage portion communicating with the notch portion, a power unit, a power source that drives the fan, a power cable that supplies electricity from the power source to the fan, a connector that connects the power cable, a connector fixing member that fixes the connector inside, a housing having the guide unit and an opening, a locking member that moves while being suspended inside the housing along the notch portion and the passage portion of the guide unit and can be supported at an arbitrary position of the notch portion and the passage portion of the guide unit, a duct that is square tubular, one opening of the square tube is closed by the fan, air used for cooling by the fan passes through the inside of the square tube, and the duct has at least one locking member on an upper surface of the square tube, and a cover that has the fan, a fan-side power cable that supplies electricity from the power source to the fan, a fan-side connector that is connected to the connector, and the duct, and is supported in a state where the connector fixing member is exposed by the guide unit and the locking member when removing or attaching, and the fan-side connector can be attached and detached to and from the connector fixing member from the outside of the housing.

[0007] According to the power conversion device described herein, the cover can be easily attached to and detached from the housing, improving maintainability.

[0008] This is a front view of a power converter according to Embodiment 1 of the present disclosure. This is a rear view of a power converter according to Embodiment 1 of the present disclosure. This is a perspective view of a power converter according to Embodiment 1 of the present disclosure (with the cover removed). This is a perspective view of the guide section of a power converter according to Embodiment 1 of the present disclosure. This is a configuration diagram of the cover of a power converter according to Embodiment 1 of the present disclosure. This is a perspective view of the cover of a power converter according to Embodiment 1 of the present disclosure. This is a magnified view of the area around the locking member and notch of a power converter according to Embodiment 1 of the present disclosure. This is an exploded perspective view of the cover of a power converter according to Embodiment 1 of the present disclosure. This is a configuration diagram of the fan of a power converter according to Embodiment 1 of the present disclosure. This is a diagram showing the procedure for removing the cover of a power converter according to Embodiment 1 of the present disclosure. This is a diagram showing a plan view of the cover of a power converter according to Embodiment 2 of the present disclosure (with two or one locking member). This is a diagram showing the locking member of a power converter according to Embodiment 3 of the present disclosure. This is a diagram showing the guide section of a power converter according to Embodiment 4 of the present disclosure. This is a configuration diagram of the cover of a power converter according to Embodiment 5 of the present disclosure. This is a diagram showing the configuration of a power converter according to Embodiment 5 of the present disclosure (without the cover). This figure shows the configuration of the power converter according to Embodiment 5 of the present disclosure (with the cover attached). This figure shows the power converter according to Embodiment 6 of the present disclosure and the procedure for attaching the cover to the power converter. This figure shows an example of mounting the power converter according to Embodiments 1 to 6 of the present disclosure on a vehicle.

[0009] Embodiment 1. Figure 1 is a front view of a power converter according to Embodiment 1 of the present disclosure. As shown in Figure 1, the power converter 1 comprises a housing 2, a front cover 3, and an intake filter 4. In Figure 1, the X-axis indicates the short direction of the power converter 1, and the Y-axis indicates the long direction of the power converter 1. When the power converter 1 is installed on a horizontal floor, the Y-axis indicates the vertical direction. The X-axis, Y-axis, and Z-axis are orthogonal to each other. The Z-axis indicates the depth direction of the power converter 1. The same applies to subsequent figures.

[0010] The power converter 1 is, for example, an auxiliary power supply for a station building. It converts surplus regenerative energy generated during vehicle braking that could not be shared between vehicles into AC power for the station building, and utilizes it as load power for the station. The power converter 1 is installed, for example, in a gravel-covered space beside the railway tracks.

[0011] The enclosure 2 houses a power unit (not shown) having semiconductor elements necessary for power conversion, a power supply (not shown), and other components internally.

[0012] The front cover 3 is a cover that can be opened and closed when removing the power unit or other components located inside the housing 2 for maintenance.

[0013] The intake filter 4 is a filter that removes dust and other particles when drawing in outside air to cool the power unit and other components.

[0014] Figure 2 is a rear view of a power converter according to Embodiment 1 of the present disclosure. As shown in Figure 2, the power converter 1 comprises a housing 2, a cover 5, and a fan 6.

[0015] Cover 5 is the rear cover of the enclosure 2 and is removed when performing maintenance on the inside of the enclosure 2 or the fan 6. Cover 5 is screwed to the enclosure 2, and can be removed from the enclosure 2 by unscrewing it.

[0016] Fan 6 is powered by a power supply inside the enclosure 2, draws in air from the intake filter 4, cools the power unit with the drawn-in air, and exhausts the air to the outside of the enclosure 2. Fan 6 is integrated with the cover 5 by being secured with screws. Fan 6 can be removed from the cover 5 by unscrewing it.

[0017] Figure 3 is a perspective view (with the cover removed) of a power converter according to Embodiment 1 of the present disclosure. As shown in Figure 3, the power converter 1 comprises a housing 2, a cover 5, a fan 6, an opening 7, a power cable 8, a connector 9, a connector fixing member 10, and a guide part 11, with the cover 5 removed from the housing 2 and the opening 7 exposed.

[0018] The opening 7 is provided in the housing 2 and is covered by the cover 5 when the power converter 1 is in use. When performing maintenance on the inside of the housing 2 or the fan 6, the cover 5 is removed from the housing 2. After maintenance is complete, the cover 5 is attached to the housing 2, and the opening 7 is covered by the cover 5.

[0019] The power cable 8 is a power cable that supplies power to drive the fan 6 from the power supply inside the enclosure 2.

[0020] Connector 9 is a connector for connecting the power cable 8 and the fan-side power cable 14 of the fan 6 (described later) via the fan-side connector 15. The fan 6 is integrated with the cover 5, and when removing the cover 5 from the enclosure 2, the fan 6's power cable is disconnected from the power cable 8 by unplugging it from connector 9.

[0021] The connector fixing member 10 is a fixing member for fixing the connector 9 inside the housing 2.

[0022] The guide section 11 restricts the movement of the cover 5 when removing or installing the cover 5, and also supports the cover 5. The guide section 11 is fixed inside the housing 2 by screws or the like.

[0023] Figure 4 is a perspective view of the guide portion of a power converter according to Embodiment 1 of the present disclosure. As shown in Figure 4, the guide portion 11 includes a plate-shaped member 1101 having a notch 1102 and a passage portion 1103 for passing a locking member, which will be described later, through the notch 1102 at its peripheral edge.

[0024] The notch portion 1102 has an L-shaped cutout. On the other hand, the passage portion 1103 has an F-shaped cutout. The notches of the two notches 1102 are connected to the passage portion 1103. The movement of the cover 5 is restricted along these two notches 1102 and the passage portion 1103, and the cover 5 is supported at any position along the two notches 1102 or the passage portion 1103. For the movement and support of the cover 5, the guide portion 11 is provided with two sets of two notches 1102 and one passage portion 1103.

[0025] Figure 5 is a diagram showing the configuration of the cover of a power converter according to Embodiment 1 of the present disclosure, where Figure 5(a) is a front view of the cover, Figure 5(b) is a rear view of the cover, Figure 5(c) is a side view of the cover, and Figure 5(d) is a top view of the cover.

[0026] Figure 5(a) is a front view of the cover, where the cover 5 is integrated with the fan 6 by screws and other fasteners.

[0027] Figure 5(b) is a rear view of the cover, which includes a fan 6, a locking member 12, a gasket 13, a fan-side power cable 14, a fan-side connector 15, and a duct 16.

[0028] The locking member 12 is equipped with a screw with a helical notch at its tip and is directly attached to a screw hole on the upper surface of the duct 16, which will be described later. The locking member 12 moves the cover 5, which is integrated with the fan 6, while being suspended vertically inside the housing 2 along the notch 1102 and passage 1103 of the guide part 11 which is fixed inside the housing 2. It also supports the cover 5 at any position in the notch 1102 and passage 1103 of the guide part 11.

[0029] The packing 13 covers one edge of the opening of the duct 16, which will be described later, for waterproofing purposes. When the cover 5 is attached to the housing 2, the packing 13 is tightly fitted to the edge of the inner wall of the housing 2 to prevent water from entering the power unit inside the housing 2 from the duct 16. The packing 13 is made of, for example, rubber or resin.

[0030] The fan-side power cable 14 is a cable that supplies electricity to drive the fan 6. The fan-side power cable 14 is connected to the fan 6 and the fan-side connector 15, which will be described later.

[0031] The fan-side connector 15 is connected to the connector 9, which is fixed by the connector fixing member 10, and power is supplied to the fan 6 from the power supply inside the housing 2 via the fan-side power cable 14.

[0032] Figure 5(c) is a side view of the cover, and Figure 5(d) is a top view of the cover. The cover 5 includes a fan 6, a locking member 12, a fan-side power cable 14, a fan-side connector 15, and a duct 16.

[0033] The duct 16 is rectangular in shape, and one of the openings of the rectangular tube, the one not covered by the gasket 13, is closed by the fan 6, secured with screws or the like. The fan 6 is detachable from the duct 16 and can be removed from or attached to the duct 16. Alternatively, the fan 6 may be permanently fixed and not detachable. The duct 16 is fixed to the cover 5 with four locking members 12 on the top surface of the rectangular tube. The fan 6 draws in outside air from the intake filter 4 located on the front side of the housing 2, cools the power unit (not shown) inside the housing 2, passes through the duct 16, and exhausts the air to the outside of the housing 2 from the fan 6. The fan-side power cable 14 is fixed to the bottom of the duct 16 and has excess length near the fan-side connector 15 so as not to be damaged when removing and attaching the cover 5.

[0034] Figures 6(e) and 6(f) are perspective views of the cover of the power converter. The cover 5 includes a fan 6, a locking member 12, a packing 13, a fan-side power cable 14, a fan-side connector 15, and a duct 16.

[0035] Figure 7 is a magnified view showing the locking member and the surrounding area of ​​the notch of the power converter according to Embodiment 1 of the present disclosure.

[0036] The locking member 12 is constructed by attaching a bolt and washer to a metal hexagonal spacer, with the bolt forming a protrusion on the locking member 12. As the protrusion of the locking member 12 abuts against the guide portion other than the notch 1102 and the passage portion 1103, the locking member 12 moves while suspended along the notch 1102 and the passage portion 1103 of the guide portion 11, or stops at any notch position to support the cover 5. For example, as shown in Figure 7, the locking member 12 supports the cover 5 while suspended and stopped at the outermost end of the notch 1102. The material and dimensions of the locking member 12 only need to have sufficient strength to support the cover 5.

[0037] Figure 8 is an exploded perspective view of the cover of a power converter according to Embodiment 1 of the present disclosure. As shown in Figure 8, the cover 5 includes a fan 6 and a duct 16.

[0038] Figure 9 is a diagram showing the configuration of a fan in a power converter according to Embodiment 1 of the present disclosure, where Figure 9(a) is a front view of the fan, Figure 9(b) is a side view of the fan, and Figure 9(c) is a top view of the fan. As shown in Figures 9(a) to 9(c), the fan 6 is equipped with a fan power cable 17 and a waterproof connector 18.

[0039] The fan power cable 17 is a power cable for driving the four fan units of the fan 6, and one cable is provided for each fan unit.

[0040] The waterproof connector 18 connects the fan power cable 17 to the fan-side power cable 14. The waterproof connector 18 is inserted into an insertion hole formed on the side of the duct 16 and seals tightly to the duct 16 from the inside to prevent water from entering the housing 2 from the duct 16. The waterproof connector 18 is made of, for example, rubber or resin. Alternatively, the waterproof connector 18 may be made of, for example, metal, and a gasket made of rubber or resin may be used in the watertight part.

[0041] Next, the procedure for removing the cover of the power converter is shown. Figure 10 is a diagram showing the procedure for removing the cover of the power converter according to Embodiment 1 of this disclosure.

[0042] In step 1 of Figure 10(a), the cover 5, which is integrated with the fan 6, is in a state (initial state) that closes the opening 7 of the housing 2. In the initial state, four locking members 12 provided on the duct 16, which is screwed to the cover 5, are locked at the outermost end of the notch 1102 of the guide part 11 fixed inside the housing. To drive the fan 6, the fan-side connector 15 is connected to the connector fixing member 10, and power is supplied to the fan 6 from the power supply inside the housing. When removing the cover 5 from the housing 2, a maintenance worker grasps the handle of the cover 5 and moves the cover 5 manually in the direction of block arrow 19. The cover 5 moves in the direction of block arrow 19 while being suspended vertically along the notch of the guide part 11, and moves to the position of the corner of the notch of the guide part 11, where it stops in a supported state. When cover 5 moves from its initial position in the direction of block arrow 19 and stops, the slack portion formed by the excess length of the fan-side power cable 14 stretches by the length of cover 5's movement. Since cover 5's movement is restricted and stopped by the guide portion 11, damage to the fan-side power cable 14 due to stretching when removing cover 5 can be prevented.

[0043] In step 2 of (b) in FIG. 10, the maintenance staff moves the cover 5 in the direction of the block arrow 20. The cover 5 moves in the direction of the block arrow 20 while being vertically suspended along the passage portion 1103 of the guide portion 11, and moves to the position where it abuts in the direction of the block arrow 20 in the passage portion, and stops in a supported state (the state of step 3 of (c) in FIG. 10). As a result, the opening 7 of the housing 2 is partially exposed, so that the connector fixing member 10 is exposed, and the maintenance staff can touch the fan-side connector 15 connected to the connector fixing member 10 from the outside of the housing 2. When the cover 5 moves in the direction of the block arrow 20 from the state of step 2 and stops to enter the state of step 3, the bent portion formed by the extra length of the fan-side power cable 14 extends by the length of the movement of the cover 5. Since the movement of the cover 5 is restricted and stopped by the guide 11 portion, damage due to the extension of the fan-side power cable 14 when the cover 5 is removed can be prevented.

[0044] In step 3 of (c) in FIG. 10, the maintenance staff removes the fan-side connector 15 from the connector 9 fixed to the connector fixing member 10. Since the cover 5 is supported by the guide 11 portion, the maintenance staff can remove the fan-side connector 15 without supporting the cover 5. After that, the maintenance staff moves the cover 5 in the direction of the block arrow 21 and completely removes the cover 5 from the housing 2.

[0045] Step 4 of (d) in FIG. 10 is a state where the cover 5 is completely removed from the housing 2.

[0046] The procedure for attaching the cover 5 of the power conversion device 1 is performed in the reverse procedure of the removal procedure.

[0047] As described above, the power conversion device 1 according to the present embodiment includes a power unit that converts power, a fan 6 that cools the power unit, a plate-shaped guide unit 11 having at least one notch 1102 at the peripheral portion and a passage portion 1103 communicating with the notch 1102, a power unit, a power source that drives the fan 6, a power cable 8 that supplies electricity from the power source to the fan 6, a connector 9 that connects the power cable 8, a connector fixing member 10 that fixes the connector 9 inside, a guide unit 11, and a housing having an opening 7, a locking member 12 that moves while being suspended inside the housing 2 along the notch 1102 and the passage portion 1103 of the guide unit 11 and can be supported at any position of the notch 1102 and the passage portion 1103 of the guide unit 11, a duct 16 that is in a square tube shape, one of the openings of the square tube is closed by the fan 6, the air used by the fan 6 for cooling passes through the inside of the square tube, and the upper surface of the square tube has at least one locking member 12, a cover that has the fan 6, a fan-side power cable 14 provided in the fan 6 that supplies electricity from the power source, a fan-side connector 15 connected to the connector 9, and the duct 16, and is supported in a state where the connector fixing member 10 is exposed by the guide unit 11 and the locking member 12 when removed or attached, and the fan-side connector 15 can be attached to and detached from the connector fixing member 10 from the outside of the housing 2.

[0048] Thereby, the cover 5 can be easily attached to and detached from the housing 2 of the power conversion device 1, and the maintainability is improved.

[0049] Embodiment 2. The power conversion device of Embodiment 2 will be described with reference to FIG. 11. In the description of Embodiment 2, the same reference numerals as those in Embodiment 1 indicate the same or corresponding parts.

[0050] Figure 11 is a plan view of the cover of a power converter according to Embodiment 2 of the present disclosure, where Figure 11(a) is a plan view of the cover with two locking members, and Figure 11(b) is a plan view of the cover with one locking member. As shown in Figures 11(a) and 11(b), the locking members 12 only need to be sufficient to allow the cover 5 to move, support, and stop to a degree that is sufficient for maintenance personnel to perform work when removing and installing the cover 5, so there may be two or even one locking member 12. The number of notches 1102 and passages 1103 of the guide portion 11 is the same as the number of locking members 12. As described above, there only needs to be at least one locking member 12, and the number of locking members 12 is less than the number of locking members 12 in Embodiment 1, so the power converter can be manufactured at a lower cost.

[0051] Embodiment 3. The power conversion device of Embodiment 3 will be described with reference to Figure 12. In the description of Embodiment 3, the same reference numerals as in Embodiment 1 indicate the same or corresponding parts.

[0052] Figure 12 shows a locking member of a power converter according to Embodiment 3 of the present disclosure, where Figure 12(a) shows a locking member with a round spacer, Figure 12(b) shows a locking member with a round screw head, and Figure 12(c) shows a locking member with a machined part. As shown in Figure 12(a), because the locking member is a round spacer 1201, it can move more smoothly along the guide part 11 than the hexagonal locking member 12 in Embodiment 1. As shown in Figure 12(b), in the case of a locking member 1202 with a round screw head, and as shown in Figure 12(c), in the case of a locking member 1203 having a protrusion due to machining, the bolts and washers of the locking member 12 in Embodiment 1 are unnecessary, making it possible to manufacture the locking member at a lower cost.

[0053] Embodiment 4. The power conversion device of Embodiment 4 will be described with reference to Figure 13. In the description of Embodiment 4, the same reference numerals as in Embodiment 1 indicate the same or corresponding parts.

[0054] Figure 13 shows the guide portion of a power converter according to Embodiment 4 of the present disclosure. As shown in Figure 13, the notch 1102 of the guide portion 11 is oblique to the passage portion 1103, so the cover 5 can be removed and attached more smoothly than in the guide portion 11 of Embodiment 1, where the notch 1102 is perpendicular to the passage portion 1103.

[0055] Embodiment 5. The power conversion device of Embodiment 5 will be described with reference to Figures 14, 15, and 16. In the description of Embodiment 5, the same reference numerals as in Embodiment 1 indicate the same or corresponding parts.

[0056] Figure 14 is a diagram showing the configuration of the cover of a power converter according to Embodiment 5 of the present disclosure, where Figure 14(a) is a plan view of the cover and Figure 14(b) is a rear view of the cover.

[0057] In Figures 14(a) and 14(b), in Embodiment 5, the guide portion 11 that was provided by the housing 2 in Embodiment 1 is provided by the duct 16 provided by the cover 5 which is integrated with the fan 6. The guide portion 11 is a plate-shaped object processed into a convex shape and is fixed to the upper surface of the duct 16 by screws or the like.

[0058] Figure 15 is a diagram showing the configuration of a power converter according to Embodiment 5 of the present disclosure (without cover), where Figure 15(a) is a perspective view and Figure 15(b) is a rear view.

[0059] In Figures 15(a) and 15(b), in Embodiment 5, the locking member 12 that was provided on the duct 16 in Embodiment 1 is provided with four plate-shaped locking portions 22. The locking portions 22 are fixed to the inside of the housing 2 by screws or the like. As described above, in Embodiment 1, the locking member 12 was attached upward to the duct 16 because the duct 16, which is fixed to the cover 5, is suspended from the guide portion 11 inside the housing 2. On the other hand, in Embodiment 5, the locking member 12 is attached downward to the locking portion 22 because the duct 16, which has the guide portion 11, is suspended from the locking portion 22 inside the housing 2.

[0060] Figure 16 is a diagram showing the configuration of a power converter according to Embodiment 5 of the present disclosure (with the cover attached), and shows only the locking portion 22 of the cover 5 and housing 2 when the cover is attached.

[0061] In Figure 16, the guide portion 11 of the cover 5, which is integrated with the fan 6, moves while being suspended vertically from the locking member 12 of the locking portion 22 fixed inside the housing 2, along the notch portion 1102 and the passage portion 1103 of the guide portion 11. The cover 5 is also supported at any position along the notch portion 1102 and the passage portion 1103 of the guide portion 11. At this time, the connector fixing member 10 is exposed, allowing maintenance personnel to attach and detach the fan-side connector 15 connected to the connector fixing member 10 from outside the housing 2.

[0062] As described above, in Embodiment 5, the guide portion 11 of Embodiment 1 is provided on the duct 16, and the locking member 12 of Embodiment 1 is provided inside the housing 2. This makes it easier to fix the guide portion 11, as the larger guide portion 11 can be fixed to the upper surface of the duct 16, which has more space, rather than to the limited space inside the housing 2.

[0063] Embodiment 6. The power conversion device of Embodiment 6 will be described with reference to Figure 17. In the description of Embodiment 6, the same reference numerals as in Embodiment 1 indicate the same or corresponding parts.

[0064] Figure 17 shows a power converter and a procedure for attaching the cover of the power converter according to Embodiment 6 of the present disclosure.

[0065] In Figure 17(a) side view (procedure 1), the housing 2 of the power converter 1 is provided with a total of two guide sections 11, each having four notches 1102, on both internal sides. The guide section 11 is a plate-shaped section with a convex shape and is fixed to the side of the housing 2 with screws or the like. The rectangular duct 16 fixed to the cover 5 is provided with a total of eight locking members 12, four on each side of the rectangular duct.

[0066] When attaching the cover 5 to the housing 2, the maintenance worker grasps the handle of the cover 5 and manually moves the cover 5 in the direction of block arrow 23. At any horizontal position among the notch 1102 and passage 1103 of the guide portion 11, i.e., any position where the cover 5 can move horizontally by the guide portion 11, the cover 5 is restricted from moving vertically by the guide portion 11 and is supported. At this time, the connector fixing member 10 is exposed, and the maintenance worker can attach and detach the fan-side connector 15 connected to the connector fixing member 10 from outside the housing 2. With the cover 5 supported by the passage 1103 of the guide portion 11, the maintenance worker attaches the fan-side connector 15 to the connector fixing member 10. The cover 5 moves along the notch of the guide portion 11 in the direction of block arrow 23, moves to the outermost position of the notch of the guide portion 11, and stops in a supported position.

[0067] Figure 17(b) side view (procedure 2) shows the cover 5 fully attached to the housing 2.

[0068] As described above, since the cover 5 is supported by the guide portion 11, maintenance personnel can attach the fan-side connector 15 without having to support the cover 5.

[0069] The procedure for removing the cover 5 of the power converter 1 is to perform the installation procedure in reverse order.

[0070] This makes it easy to attach and detach the cover 5 to the housing 2 of the power converter 1, improving maintainability.

[0071] In each embodiment, the power converter 1 is, for example, an auxiliary power supply unit for a station building installed on the ground, but it may also be a power converter unit mounted on a vehicle.

[0072] Figure 18 shows an example of a power converter according to Embodiments 1 to 6 of the present disclosure mounted on a vehicle. Figure 18(a) is a front view of the power converter, and Figure 18(b) is a rear view of the power converter. In Figures 18(a) and 18(b), the power converter 1, which has a three-tiered structure in each embodiment, becomes a single-tiered power converter 1 arranged side-by-side. A member for fixing the device is located on the top surface of the power converter 1, and the power converter 1 is installed under the floor of the train using the device fixing member.

[0073] Furthermore, combining, modifying, or omitting each embodiment as appropriate is also included within the scope of the technical ideas shown in the embodiments.

[0074] 1 Power converter, 2 Housing, 3 Front cover, 4 Intake filter, 5 Cover, 6 Fan, 7 Opening, 8 Power cable, 9 Connector, 10 Connector fixing member, 11 Guide part, 1101 Plate-shaped member, 1102 Notch, 1103 Passage part, 12 Locking member, 1201 Round spacer, 1202 Locking member with round screw head, 1203 Locking member with uneven surface due to machining, 13 Gasket, 14 Fan-side power cable, 15 Fan-side connector, 16 Duct, 17 Fan power cable, 18 Waterproof connector, 19, 20, 21, 23 Block arrow, 22 Locking part

Claims

1. A power unit for converting electricity; a fan for cooling the power unit; a plate-shaped guide portion having at least one notch and a passage portion communicating with the notch on its peripheral edge; a housing having the power unit, a power supply for driving the fan, a power cable for supplying electricity from the power supply to the fan, a connector for connecting the power cable, a connector fixing member for fixing the connector internally, the guide portion, and an opening; a locking member that moves while suspended inside the housing along the notch and the passage portion of the guide portion and can be supported at any position of the notch and the passage portion of the guide portion; a duct that is rectangular in shape, with one end of the opening of the rectangular tube closed by the fan, through which the air used by the fan for cooling passes inside the rectangular tube, and having at least one of the locking members on the upper surface of the rectangular tube; A power conversion device comprising: a fan; a fan-side power cable provided on the fan and supplied with power from the power source; a fan-side connector connected to the connector; and a duct, the cover being supported by the guide portion and the locking member in a state where the connector fixing member is exposed when removed or installed, and allowing the fan-side connector to be attached to and detached from the connector fixing member from outside the housing.

2. The power conversion device according to claim 1, wherein the locking member comprises a hexagonal spacer, a bolt, and a washer.

3. The power conversion device according to claim 1, wherein the locking member comprises a round spacer, a bolt, and a washer.

4. The power conversion device according to claim 1, wherein the locking member has a round screw head.

5. The power conversion device according to claim 1, wherein the locking member is a machined member.

6. The power conversion device according to any one of claims 1 to 5, wherein the notch portion comprises the guide portion which is perpendicular to the passage portion.

7. The power conversion device according to any one of claims 1 to 5, comprising the guide portion wherein the notch portion is oblique to the passage portion.

8. A power unit for converting electricity; a fan for cooling the power unit; a plate-shaped locking portion having a locking member; a housing having the power unit, a power supply for driving the fan, a power cable for supplying electricity from the power supply to the fan, a connector for connecting the power cable, a connector fixing member for fixing the connector internally, the locking portion, and an opening; a plate-shaped guide portion having at least one notch on its periphery and a passage for passing the locking member through the notch, moving while suspended inside the housing along the notch and the passage, and being supportable at any position of the notch and the passage; a duct that is rectangular in shape, with one end of the rectangular tube's opening closed by the fan, through which the air used by the fan for cooling passes inside the rectangular tube, and having the guide portion on the upper surface of the rectangular tube; A power conversion device comprising: a fan; a fan-side power cable provided on the fan and supplied with power from the power source; a fan-side connector connected to the connector; and a duct, the cover being supported by the guide portion and the locking member in a state where the connector fixing member is exposed when removed or installed, and allowing the fan-side connector to be attached to and detached from the connector fixing member from outside the housing.

9. A power unit for converting electricity; a fan for cooling the power unit; a plate-shaped guide portion having at least one notch and a passage portion communicating with the notch on its peripheral edge; a housing having an opening and the guide portion on both internal sides; a locking member that moves inside the housing along the notch and the passage portion of the guide portion and can be supported at any horizontal position of the notch and the passage portion of the guide portion; a duct that is rectangular in shape, with one opening of the rectangular tube closed by the fan, through which air used by the fan for cooling passes inside the rectangular tube, and having at least one locking member on both sides of the rectangular tube; A power conversion device comprising: a fan; a fan-side power cable provided on the fan and supplied with power from the power source; a fan-side connector connected to the connector; and a duct, the cover being supported by the guide portion and the locking member in a state where the connector fixing member is exposed when removed or installed, and allowing the fan-side connector to be attached to and detached from the connector fixing member from outside the housing.

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