Power conversion device

Abstract

The capacitor unit (1) includes a capacitor (10), a plate-shaped base portion (20) having a mounting surface (20A), and a locking member (25). The locking member (25) has a shaft portion and a head that are inserted into a hole formed in the mounting surface (20A). A first guide member (114A) and a second guide member guide the first end and the second end of the base portion (20) in the lateral direction, respectively, in the front-rear direction. The hole is located between the capacitor and the first end in the lateral direction, and is positioned further away from the opening 111 than the first guide member (114A) in the front-rear direction. In a first engagement position when the head contacts the mounting surface, the locking member (25) abuts against the first guide member (114A). In a second engagement position where the lower end of the head is higher than the upper end of the first guide member (114A), the abutment between the locking member (25) and the first guide member (114A) is released.

Description

Technical Field

[0001] This disclosure relates to power conversion devices. Background Technology

[0002] Japanese Patent Application Publication No. 2018-207563 (Patent Document 1) discloses a power conversion device that houses multiple units inside a rectangular parallelepiped-shaped housing. The multiple units include multiple power conversion devices and capacitor units housing multiple capacitors. The multiple power conversion devices and capacitor units are arranged in a multi-level stack along the vertical direction of the housing.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-207563 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] In the power conversion device described in Patent Document 1, during the maintenance, inspection or replacement of the capacitor unit, the capacitor unit can be pulled forward through the opening provided on the front surface of the housing, thereby removing the capacitor unit from the housing.

[0008] However, since wiring components are connected to the terminals of multiple capacitors, it is necessary to disconnect the wiring components from the terminals of each capacitor in order to remove the capacitor unit. At this time, for capacitors located on the inside of the housing, it is necessary to disconnect the wiring components while the capacitor unit is being pulled forward from the opening, which raises concerns about the possibility of the capacitor unit falling out of the housing during the operation.

[0009] As a countermeasure to prevent capacitor cells from falling, one method is to house the capacitor cells near the top of the housing, and after removing the wiring components through an opening in the top, pull the capacitor cells out of the housing. However, this method restricts the placement of the capacitor cells, thus reducing the freedom of arrangement of multiple cells inside the housing. Furthermore, by placing the capacitor cells near the top, the length of the wiring components connected to the capacitors increases, potentially increasing high-order harmonic noise that overlaps with voltage or current.

[0010] This disclosure was made to solve the above-mentioned technical problems, and its purpose is to provide a power conversion device that can prevent the capacitor unit from falling during the removal of the capacitor unit and can eliminate the constraints on the configuration of the capacitor unit in the housing.

[0011] Means for solving technical problems

[0012] One embodiment of the power conversion device disclosed herein includes a capacitor unit and a housing. The housing has an opening facing forward, allowing the capacitor unit to be removed through the opening. The housing includes a shelf, a first guide member, and a second guide member. The shelf is formed as a plate extending orthogonally to the vertical direction of the housing, for mounting the capacitor unit. The first guide member and the second guide member are disposed on the shelf. The capacitor unit includes: a capacitor; a plate-shaped base portion having a mounting surface for mounting the capacitor; and a locking member. The locking member has a shaft portion that is inserted into a hole formed in the mounting surface and a head protruding from the hole. The locking member is configured such that the height of the head in the vertical direction can be changed by changing the engagement position of the shaft portion and the hole. The first guide member and the second guide member are configured to guide a first end portion and a second end portion of the base portion in the horizontal direction orthogonal to the vertical direction along a front-back direction orthogonal to the vertical direction and the lateral direction. The hole is located between the capacitor and the first end portion in the lateral direction, and is positioned further away from the opening in the front-back direction than the first guide member. In the first engaging position when the head contacts the mounting surface, the locking component abuts against the first guide component. In the second engaging position, where the lower end of the head is higher than the upper end of the first guide component, the abutment between the locking component and the first guide component is released.

[0013] The effects of the invention

[0014] According to this disclosure, a power conversion device can be provided that can prevent capacitor cells from falling during capacitor cell removal operations and can eliminate constraints on the configuration of capacitor cells in the housing. Attached Figure Description

[0015] Figure 1 This is a schematic external view showing an example of the structure of a power conversion device according to an embodiment.

[0016] Figure 2 It is a circuit diagram representing the structure of an uninterruptible power supply device.

[0017] Figure 3 This is an external view of a capacitor cell.

[0018] Figure 4 This is a partial perspective view showing the state in which capacitor cells are housed within a housing.

[0019] Figure 5 Viewed from the direction of arrow A Figure 4 A diagram of a capacitor cell.

[0020] Figure 6 It is a partial three-dimensional view showing the state of the capacitor unit being pulled out from the opening of the casing.

[0021] Figure 7 This is a partial 3D view showing the state of the capacitor unit after it has been removed from the casing.

[0022] Figure 8 This is a partial schematic diagram of the base and shelf.

[0023] Figure 9 yes Figure 8 (B) shows a cross-sectional view of the IX-IX line.

[0024] Figure 10 This is a top view of a capacitor cell in a modified embodiment. Detailed Implementation

[0025] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Furthermore, the same or equivalent parts in the drawings will be labeled with the same symbols, and their descriptions will not be repeated in principle.

[0026] [Example of the structure of a power conversion device]

[0027] Figure 1 This is a schematic external view showing a structural example of the power conversion device according to the embodiment. The power conversion device of this embodiment is representatively applicable to the uninterruptible power supply (UPS) device 100. Under normal conditions, the UPS device 100 supplies power to the load (not shown) using AC power supplied from an AC power source such as a commercial power source. In the event of an AC power outage, the UPS device 100 supplies power to the load using DC power supplied from an energy storage device (not shown).

[0028] like Figure 1 As shown, the uninterruptible power supply (UPS) device 100 includes a disc-shaped (cubic-pole) housing 110, multiple units 1 to 7, and a fan 8. In the following description, the left-right direction when viewing the housing 110 from the front side is defined as the X-axis, the front-back direction as the Y-axis, and the up-down direction as the Z-axis. Furthermore, the +X direction is the direction moving to the right along the X-axis, and the -X direction is the opposite direction to the +X direction. The +Y direction is the direction from the front of the UPS device 100 towards the back, and the -Y direction is the opposite direction to the +Y direction. The +Z direction is the direction moving upwards along the Z-axis, and the -Z direction is the opposite direction to the +Z direction.

[0029] The housing 110 houses multiple units 1 to 7. The housing 110 has an opening 111 that opens in the -Y direction and a front cover (not shown) that covers the opening 111. The front cover is configured to open and close the opening 111. A vent is formed on the front cover for introducing air from outside the housing 110 into the housing 110.

[0030] Multiple units 1 to 7 are generally rectangular in shape and are stacked at intervals along the Z-axis. The multiple units 1 to 7 include capacitor unit 1 containing a capacitor and component units 2 to 7 containing components other than capacitors. Component units 2 to 7 include chopper circuit 2, power converter (hereinafter also referred to as "converter unit") 3 to 5, control device 6, and circuit breaker unit 7. The structure of capacitor unit 1 and component units 2 to 7 will be described later.

[0031] Multiple units 1 to 7 are inserted into the interior of housing 110 from the outside through opening 111. Each of the multiple units 1 to 7 is configured to be insertable and removable in the Y-axis direction to facilitate maintenance, inspection, and replacement with new units.

[0032] A fan 8 is disposed on the upper surface of the housing 110. The fan 8 draws in air from inside the housing 110 and exhausts the drawn-in air to the outside of the housing 110. Thus, air is introduced into the housing 110 through the vents in the front cover of the housing 110, and this introduced air passes through the multiple units 1 to 7, thereby promoting heat dissipation from the multiple units 1 to 7. The air heated by passing through the multiple units 1 to 7 is then exhausted to the outside of the housing 110.

[0033] Figure 2 This is a circuit diagram showing the structure of the uninterruptible power supply device 100.

[0034] like Figure 2 As shown, the uninterruptible power supply (UPS) 100 includes a chopper circuit 2, converter units 3-5, a control device 6, a fan 8, capacitors C1 and C2, circuit breakers CB1-CB3, reactors L1-L3, and a switch SW. The UPS 100 is connected to the energy storage device 31. The UPS 100 is connected to the AC power supply 32 in a three-phase three-wire configuration and to the load 33 in a three-phase four-wire configuration.

[0035] Converter units 3 to 5 are respectively configured to correspond to phases U, V, and W. Converter units 3 to 5 each have a converter CNV and an inverter INV.

[0036] The three-phase AC power input from AC power source 32 is sequentially fed into converter units 3-5, one phase at a time, via circuit breaker CB1 and reactor L2. Converter units 3-5 convert the input three-phase AC power into DC power, and then convert this DC power into three-phase AC power supplied to load 33. Converter units 3-5 then output the converted three-phase AC power sequentially via reactor L3 and circuit breaker CB3 to load 33 and fan 8. A switch SW is provided on the input side of fan 8.

[0037] Each phase on the input side of the uninterruptible power supply device 100 is connected to the neutral point on the output side of the uninterruptible power supply device 100 via capacitor C1. Each phase on the output side of the uninterruptible power supply device 100 is connected to the neutral point on the output side of the uninterruptible power supply device 100 via capacitor C2.

[0038] The energy storage device 31 stores energy for supplying power when the AC power supply 32 fails. When the AC power supply 32 fails, the DC power output from the energy storage device 31 is supplied to the chopper circuit 2 via the circuit breaker CB2 and the reactor L1.

[0039] The chopper circuit 2 boosts the DC voltage supplied from the energy storage device 31 and supplies DC power to each DC link of the converter units 3 to 5. When charging the energy storage device 31, the chopper circuit 2 operates by charging the energy storage device 31 using the DC power input from the DC links of the converter units 3 to 5.

[0040] The chopper circuit 2 and the converter units 3 to 5 each have circuits composed of switching elements such as IGBTs (Insulated Gate Bipolar Transistors).

[0041] Control device 6 controls the overall operation of uninterruptible power supply device 100. Control device 6 detects whether an AC power supply failure has occurred in AC power supply 32, and controls the operation of chopper circuit 2 and converter units 3-5 based on the detection result. Control device 6 also controls the opening and closing of circuit breakers CB1-CB3 and switch SW.

[0042] Capacitors C1 and C2 are housed in Figure 1 In capacitor unit 1 shown. Although not illustrated, reactors L1 to L3 are disposed inside housing 110 in the space on the rear side of the space where converter units 3 to 5 are installed. Circuit breakers CB1 to CB3 are housed in Figure 1 In the circuit breaker unit 7 shown.

[0043] exist Figure 1 In the example, a V-phase converter unit 4 is provided above the W-phase converter unit 5, a U-phase converter unit 3 is provided above the V-phase converter unit 4, and a chopper circuit 2 is provided above the U-phase converter unit 3.

[0044] Capacitor unit 1 is mounted on chopper circuit 2. Control device 6 and circuit breaker unit 7 are mounted on capacitor unit 1.

[0045] In addition, Figure 1 In the diagram, components 2 to 7 are shown, with [the following components] mounted on them. Figure 2The example shown includes the chopper circuit 2, converter units 3-5, control device 6, and circuit breaker unit 7. However, in addition to these, the uninterruptible power supply device 100 also includes components constituting... Figure 3 The circuit shown includes its components and devices.

[0046] [Example of a capacitor cell structure]

[0047] Figure 3 yes Figure 1 The diagram shows the appearance of capacitor unit 1. Figure 3 The appearance view is a perspective view of capacitor unit 1 viewed from the front side of housing 110.

[0048] like Figure 3 As shown, the capacitor unit 1 includes multiple capacitors 10, a base portion 20, a fin portion 21, a handle portion 22, and a locking member 25. The multiple capacitors 10 include... Figure 2 The capacitors C1 and C2 are shown.

[0049] The base portion 20 has a rectangular flat plate shape. The base portion 20 has a mounting surface 20A for mounting multiple capacitors 10, end portions 20B and 20C in the X-axis direction (left-right direction), and end portions 20D and 20E in the Y-axis direction (front-back direction).

[0050] Each of the multiple capacitors 10 has a cylindrical portion and a positive terminal 11 and a negative terminal 12 disposed at one end of the cylindrical portion. The capacitors 10 are mounted on the mounting surface 20A with the terminals 11 and 12 located at the upper end.

[0051] The first end of wiring component 13 is connected to the positive terminal 11. The first end of wiring component 14 is connected to the negative terminal 12. Additionally, the second end of wiring component 13 (not shown) is connected to the main wiring that electrically connects the AC power supply 32 or load 33 to the converter units 3-5. The second end of wiring component 14 (not shown) is connected to the neutral point on the output side of the uninterruptible power supply device 100.

[0052] Multiple capacitors 10 are arranged on the mounting surface 20A in a manner that aligns them along the X-axis and Y-axis directions. Figure 3 In this example, a total of 6 capacitors 10 are arranged in 3 columns along the Y-axis. In the following description, the two capacitors 10 arranged in the first column (first column) of the 3 columns are also referred to as "first capacitors 10A", the two capacitors arranged in the second column are also referred to as "second capacitors 10B", and the two capacitors 10 arranged in the last column (third column) are also referred to as "third capacitors 10C".

[0053] Two wings 21 and a handle 22 are provided at the end 20D in the Y direction of the base portion 20. The two wings 21 are arranged separately in the X-axis direction. The handle 22 is located at the center of the end 20D in the X-axis direction. Furthermore, the number of wings 21 is not limited to two, and the number of handles 22 is not limited to one.

[0054] The wing portion 21 has a flat plate shape and protrudes from the end 20D in the -Y direction. A through hole is formed in the wing portion 21, which extends through the wing portion 21 in the thickness direction. In addition, the number of through holes is not limited to one.

[0055] The handle 22 protrudes from the end 20D in the -Y direction. The operator can press the handle 22 in the +Y direction to insert the capacitor unit 1 into the housing 110. Alternatively, the operator can pull the handle 22 in the -Y direction to remove the capacitor unit 1 from the housing 110.

[0056] A handle portion 22 is also provided at the end 20E in the +Y direction of the base portion 20, similar to that at the end 20D. The two handle portions 22 can be used as handles for handling.

[0057] A hole 24 is formed in the base portion 20, opening onto the mounting surface 20A. The hole 24 extends from the mounting surface 20A in the Z-axis direction. The hole 24 can be a through hole that penetrates the flat plate portion on which the mounting surface 20A is provided in the Z-axis direction, or it can be a bottomed hole that extends from the mounting surface 20A to a predetermined depth.

[0058] Hole 24 is located in the X-axis direction between the end 20B of the base portion 20 and the capacitor 10. The location of the hole 24 will be described in more detail later.

[0059] The locking member 25 is mounted on the mounting surface 20A by being inserted into the hole 24. The locking member 25 has a shaft portion that inserts into the hole 24 and a head that protrudes from the hole 24. The locking member 25 is, for example, a bolt member having a head 25A and an external thread portion 25B. The diameter of the head 25A is larger than the diameter of the external thread portion 25B. The front end portion of the head 25A has a hexagonal shape that can hook a wrench.

[0060] The hole 24 has an opening shape corresponding to the external thread portion 25B, and an internal thread portion that engages with the external thread portion 25B is formed on its inner surface. By engaging the external thread portion 25B with the internal thread portion of the hole 24, the locking member 25 can be mounted on the mounting surface 20A.

[0061] With the locking member 25 mounted on the mounting surface 20A, the locking member 25 is rotated with the external thread portion 25B as the rotation center axis, thereby changing the engagement position between the external thread portion 25B and the internal thread portion of the hole 24. If the distance from the mounting surface 20A in the +Z direction is defined as "height", then by changing the engagement position between the external thread portion 25B and the internal thread portion, the height of the head 25A of the locking member 25 can be changed.

[0062] [How to remove capacitor unit 1]

[0063] Next, refer to Figures 4 to 7 The method for removing capacitor unit 1 from housing 110 will be described below. The method described below is to be performed when inspecting or maintaining capacitor unit 1 or when replacing capacitor unit 1 with a new one.

[0064] Figure 4 This is a partial perspective view showing the state in which the capacitor unit 1 is housed in the housing 110. Figure 5 Viewed from the direction of arrow A Figure 4 The diagram shows capacitor unit 1.

[0065] like Figure 4 As shown, capacitor unit 1 is mounted on shelf 112 disposed inside housing 110. Shelf 112 is formed as a flat plate along the X-axis and Y-axis directions.

[0066] Additionally, although the illustration is omitted, multiple shelves 112 are provided inside the housing 110. The multiple shelves 112 are arranged separately in the Z-axis direction. Figure 2 The capacitor unit 1 and component units 2 to 7 shown are separately mounted on multiple shelves 112. Therefore, the component units (control device 6 and circuit breaker unit 7) are mounted on the shelf 112 above the capacitor unit 1.

[0067] like Figure 5 As shown, capacitor unit 1 is fixed to the upper surface of shelf 112. Shelf 112 has guide members 114A, 114B and pressing members 115A, 115B. Guide members 114A, 114B and pressing members 115A, 115B are mounted on the upper surface of shelf 112.

[0068] Guide members 114A and 114B and pressing members 115A and 115B are components used to position the capacitor unit 1, which is placed on the shelf 112, on the shelf 112. Specifically, guide member 114A is provided corresponding to end 20B of base portion 20, and guide member 114B is provided corresponding to end 20C of base portion 20. Guide members 114A and 114B are arranged near the opening 111 of housing 110. Pressing members 115A and 115B are configured to hold end 20E of base portion 20 in the Z-axis direction. Pressing members 115A and 115B are arranged separately in the X-axis direction. The number of pressing members is not limited to two.

[0069] With the base portion 20 positioned on the shelf 112 by the guide members 114A, 114B and the pressing members 115A, 115B, the two wings 21 are fastened to the shelf 112 by fastening members such as bolts, thereby fixing the capacitor unit 1 to the shelf 112.

[0070] exist Figure 4 In the shown state, the locking member 25 is mounted on the mounting surface 20A. The external thread 25B of the locking member 25 is inserted into the hole 24 formed in the mounting surface 20A. The hole 24 is positioned in the Y-axis direction further away from the opening 111 than the guide member 114A. At this time, the engagement position of the external thread 25B and the internal thread of the hole 24 is adjusted so that the head 25A of the locking member 25 contacts the mounting surface 20A. This engagement position corresponds to one embodiment of the "first engagement position".

[0071] exist Figure 4 When removing the capacitor unit 1 from the housing 110 in the current state, the operator needs to perform the following operations: release the capacitor unit 1 from the shelf 112, remove the wiring components 13 and 14 that are connected to the terminals 11 and 12 of the multiple capacitors 10 contained in the capacitor unit 1, and pull the capacitor unit 1 out of the housing 110.

[0072] However, since there is a shelf 112 above capacitor unit 1 on which component units 6 and 7 are mounted, therefore... Figure 4 In the state shown, it is not easy to remove the wiring components 13 and 14 from terminals 11 and 12 of the second capacitor 10B and the third capacitor 10C from the inside. Therefore, the operator must remove the wiring components 13 and 14 from the second capacitor 10B and the third capacitor 10C during the interval between pulling the capacitor unit 1 out of the housing 110.

[0073] However, during the removal of wiring components 13 and 14, the weight balance of the base portion 20 in the front-to-back direction is disrupted, which may cause the capacitor unit 1 to fall off the shelf 112. Alternatively, during the operation, if the operator mistakenly pulls the handle portion 22 of the capacitor unit 1 sharply forward (in the -Y direction), the capacitor unit 1 may fall off the shelf 112.

[0074] Therefore, in this embodiment, a power conversion device is provided that can prevent the capacitor unit 1 from falling off the shelf 112 and stably perform the removal operation of the capacitor unit 1. The sequence of operations for removing the capacitor unit 1 will be described in detail below.

[0075] First of all, Figure 4 In the state shown, disconnect the wiring components 13 and 14 from terminals 11 and 12 of the first capacitor 10A that are closest to it.

[0076] Next, remove the fastening components that secure the two wings 21 to the shelf 112. In this state, when the handle 22 is pulled forward along the -Y direction, the base 20 of the capacitor unit 1 slides relative to the shelf 112 in the -Y direction. The guide components 114A and 114B guide the base 20 along the Y-axis direction. As a result, the capacitor unit 1 can be pulled out from the opening 111 along the -Y direction.

[0077] Slide the base portion 20 along the -Y direction until the second capacitor 10B is close to the opening portion 111. In this state, disconnect the wiring components 13 and 14 from the terminals 11 and 12 of the second capacitor 10B, respectively.

[0078] Next, the base portion 20 is slid along the -Y direction to a position where the third capacitor 10C is close to the opening portion 111. Figure 6 This is a partial perspective view showing the state in which the capacitor unit 1 is pulled out from the opening 111 of the housing 110.

[0079] When the handle 22 is pulled forward along the -Y direction, the locking member 25 mounted on the mounting surface 20A of the base 20 also moves along the -Y direction. When the base 20 is pulled forward... Figure 4 When the base portion 20 slides a predetermined length in the -Y direction, the head 25A of the locking member 25 abuts against the end of the guide member 114A in the +Y direction. This restricts the movement of the base portion 20 in the -Y direction. In other words, the locking member 25 functions as a stopper that restricts the movement of the base portion 20 in the -Y direction.

[0080] Thus, capacitor unit 1 is fixed to shelf 112 with the ends 20B and 20C of base portion 20 supported by guide members 114A and 114B. Therefore, as Figure 6As shown, with a portion of the base 20 pulled out from the opening 111, the capacitor unit 1 can be held in place without falling. As a result, the work of disconnecting the wiring components 13 and 14 from the terminals 11 and 12 of the third capacitor 10C can be performed stably. In addition, if the operator accidentally pulls the handle 22 forward sharply, the capacitor unit 1 can be prevented from falling off the shelf 112.

[0081] When the work of removing wiring components 13 and 14 from terminals 11 and 12 of the third capacitor 10C is completed, hook a tool such as a wrench onto the front end of the head 25A of the locking component 25 and rotate the head 25A. At this time, change the engagement position between the external thread 25B and the internal thread of the hole 24 so that the lower end of the head 25A is higher than the upper end of the guide component 114A. This engagement position corresponds to an embodiment of the "second engagement position".

[0082] When the lower end of the head 25A is higher than the upper end of the guide member 114A, the contact between the head 25A and the guide member 114A is released, allowing the base portion 20 to move in the -Y direction. Therefore, by pulling the handle portion 22 forward along the -Y direction, the capacitor unit 1 can be removed from the housing 110. Figure 7 This is a partial perspective view showing the state of capacitor unit 1 after being removed from housing 110.

[0083] Next, use Figure 8 and Figure 9 The function of the locking component 25 during the removal of capacitor unit 1 will be explained. Figure 8 (A) to Figure 8 (C) is a partial schematic view of the base 20 and the shelf 112.

[0084] Figure 8 (A) is Figure 4 A top view of the base 20 and shelf 112 in the shown state. Figure 8 In (A), the engagement position (first engagement position) of the external thread portion 25B of the locking member 25 and the internal thread portion of the hole 24 is adjusted so that the head 25A of the locking member 25 contacts the mounting surface 20A of the base portion 20.

[0085] Figure 8 (B) is Figure 6 A top view of the base 20 and shelf 112 in the shown state. By moving the base 20 from... Figure 8 The state of (A) slides in the -Y direction, thereby, as shown by the arrow in the figure, the locking component 25 approaches the guide component 114A.

[0086] Figure 9 (A) is Figure 8The cross-sectional view along line IX-IX shown in (B). When the head 25A contacts the mounting surface 20A, in the top view viewed from the +Y direction, the locking member 25 is positioned where a portion of the head 25A coincides with the guide member 114A. Therefore, during the sliding of the base portion 20, the head 25A abuts against the guide member 114A, restricting the sliding of the base portion 20. This prevents the capacitor unit 1 from falling off the shelf 112, thus... Figure 6 As shown, it is possible to reliably perform the operation of disconnecting wiring components 13 and 14 from terminals 11 and 12 of the third capacitor 10C.

[0087] exist Figure 9 In (B), from Figure 9 The state of (A) changes the engagement position (second engagement position) between the external thread portion 25B and the internal thread portion. The contact between the head 25A and the guide member 114A is released by making the height of the lower end of the head 25A higher than the height of the upper end of the guide member 114A.

[0088] Furthermore, in the top view viewed from the +Y direction, the external thread portion 25B does not coincide with the guide member 114A. Therefore, the external thread portion 25B does not abut against the guide member 114A. Thus, the base portion 20 can slide in the -Y direction.

[0089] Figure 8 (C) is Figure 7 The diagram shows a top view of the base 20 and shelf 112 in their current state. Since the base 20 can slide along the -Y direction, the capacitor unit 1 can be removed from the housing 110.

[0090] In addition, although the illustration is omitted, when the capacitor unit 1 is inserted into the housing 110, the following operations are performed in the reverse order of the removal operation: fixing the capacitor unit 1 to the shelf 112, connecting the wiring components 13 and 14 to the terminals 11 and 12 of the plurality of capacitors 10A to 10C contained in the capacitor unit 1, and pressing the capacitor unit 1 into the housing 110.

[0091] Specifically, during the insertion of capacitor unit 1 into housing 110, the initial adjustment of the engagement position between external thread 25B and internal thread of hole 24 is such that the height of head 25A of locking member 25 is above a predetermined height. At this time, the height of head 25A is set such that, with base 20 placed on shelf 112, the lower end of head 25A is higher than the upper end of guide member 114A. This is to prevent head 25A from contacting guide member 114A when base 20 slides along +Y direction.

[0092] Next, capacitor unit 1 is inserted into opening 111 from end 20E side. At this time, base part 20 is inserted into opening 111 such that ends 20B and 20C are located inside guide members 114A and 114B respectively.

[0093] Next, by pressing the handle portion 22 in the +Y direction, the base portion 20 slides relative to the shelf 112 in the +Y direction. The guide members 114A and 114B guide the base portion 20 along the Y-axis direction.

[0094] Since the head 25A does not abut against the guide member 114A, the locking member 25 moves along the +Y direction via the guide member 114A. As the locking member 25 passes the guide member 114A, the engagement position (first engagement position) of the external thread portion 25B and the internal thread portion of the hole 24 is changed so that the head 25A contacts the mounting surface 20A. Thus, even if the base portion 20 moves in the -Y direction, the head 25A still abuts against the guide member 114A, restricting the sliding of the base portion 20, thereby preventing the capacitor unit 1 from falling off the shelf 112.

[0095] During the sliding gap of the base portion 20 in the +Y direction, wiring components 13 and 14 are connected to terminals 11 and 12 of the third capacitor 10C and the second capacitor 10B, respectively. Furthermore, with the end portion 20E of the base portion 20 held along the Z-axis by holding components 115A and 115B, wiring components 13 and 14 are connected to terminals 11 and 12 of the first capacitor 10A. The two fins 21 are fastened to the base portion 20 by fastening components, thereby fixing the capacitor unit 1 to the shelf 112.

[0096] As explained above, the power conversion device according to this embodiment prevents the capacitor unit from falling off the shelf during the operation of removing the capacitor unit from the housing through the opening facing the front and rear directions. Therefore, the operation of removing wiring components from the multiple capacitors included in the capacitor unit can be performed stably.

[0097] Furthermore, even during the process of inserting the capacitor unit into the housing, the capacitor unit can be prevented from falling off the shelf, thus enabling stable connection of wiring components to the multiple capacitors contained in the capacitor unit.

[0098] In existing power conversion devices, from the viewpoint of ease of operation in removing wiring components from multiple capacitors, a method is adopted where capacitor units are housed near the top of the housing, and wiring components are removed from multiple capacitors using openings provided in the top. In this method, after all wiring components have been removed, the capacitor units can be taken out from the front side of the housing.

[0099] However, according to this method, the placement of the capacitor cells is restricted, thus reducing the freedom of arrangement of multiple cells within the housing. This raises concerns that it may hinder the miniaturization of the housing. Furthermore, by placing the capacitor cells near the ceiling, the length of the wiring components connecting the capacitors increases, potentially increasing high-order harmonic noise superimposed on the voltage or current.

[0100] According to the power conversion device of this embodiment, such as Figure 1 As shown, when the component units are stacked on top of the capacitor unit, the capacitor unit can be stably removed without falling off. Therefore, the arrangement of multiple units inside the housing is not limited by the capacitor unit. Furthermore, since the length of the wiring components connected to the capacitor can be shortened, the increase of higher harmonic noise can be suppressed.

[0101] [Example of Change]

[0102] In the above embodiment, a structure example in which the locking member 25 is disposed between the end 20B of the base portion 20 in the -X direction and the capacitor 10 is described. However, a structure in which the locking member 25 is disposed between the end 20C of the base portion 20 in the +X direction and the capacitor 10 may also be adopted.

[0103] Furthermore, the number of locking members 25 installed on the base portion 20 is not limited to one. For example, it can also be as follows: Figure 10 As shown, a locking member 25 is further disposed between the end 20C in the +X direction and the capacitor 10. The two locking members 25 are equidistant from the opening 111 in the Y-axis direction.

[0104] exist Figure 10 In the structural example shown, during the removal of capacitor unit 1, when the base portion 20 slides along the -Y direction, the two locking members 25 abut against the guide members 114A and 114B respectively, thus restricting the sliding of the base portion 20. Therefore, the same effect as the above-described embodiment can be obtained.

[0105] Furthermore, in the above embodiment, a bolt member having a head 25A and an external thread 25B was described as a structural example of using a locking member 25, but the locking member 25 is not limited to a bolt member. The locking member 25 can be configured to have a head and a shaft, and the height of the head can be changed according to the engagement position between the hole 24 provided on the mounting surface 20A and the shaft. For example, a pin member can also be used as the locking member 25. The pin member has a head and a shaft. The diameter of the head is larger than the diameter of the shaft. By changing the engagement position between the shaft and the hole 24, the height of the head can be adjusted. Thus, the same effect as in the above embodiment can be obtained.

[0106] The embodiments disclosed herein should be considered illustrative rather than limiting in all respects. The scope of the invention is defined not by the foregoing description but by the claims, including all modifications within the meaning and scope of the claims.

[0107] Explanation of reference numerals in the attached figures

[0108] 1: Capacitor unit; 2: Chopper circuit; 3-5: Converter unit; 6: Control device; 7: Circuit breaker unit; 8: Fan; 10, 10A-10C: Capacitor; 11: Positive terminal; 12: Negative terminal; 13, 14: Wiring components; 20: Base; 20A: Mounting surface; 21: Fin; 22: Handle; 24: Hole; 25: Locking component; 25A: Head; 25B: External thread; 31: Energy storage device; 32: AC power supply; 33: Load; 100: Uninterruptible power supply; 110: Housing; 111: Opening; 112: Shelf; 114A, 114B: Guide components; 115A, 115B: Pressing components; CB1-CB3: Circuit breaker; CNV: Converter; INV: Inverter; SW: Switch.

Claims

1. A power conversion device, comprising: Capacitor unit; as well as The housing has a forward-facing opening to accommodate the capacitor unit, through which the capacitor unit can be removed. The housing includes: A shelf, formed as a plate extending orthogonally to the vertical direction of the housing, for housing the capacitor unit; and The first guide component and the second guide component are disposed on the shelf. The capacitor unit includes: Capacitor; The plate-shaped base portion has a mounting surface for mounting the capacitor; and The locking component has: a shaft portion inserted into a hole formed in the mounting surface; and a head protruding from the hole. The locking component is configured to change the height of the head in the vertical direction by changing the engagement position between the shaft and the hole. The first guide member and the second guide member are configured to guide the first end and the second end of the base portion in the lateral direction, which is orthogonal to the vertical direction and the lateral direction, respectively. The hole is located in the lateral direction between the capacitor and the first end, and in the front-back direction at a position further away from the opening than the first guide member. In the first engaging position when the head contacts the mounting surface, the locking component abuts against the first guide component. At the second engaging position, where the lower end of the head is higher than the upper end of the first guide member, the contact between the locking member and the first guide member is released.

2. The power conversion device according to claim 1, In the first engaging position, when viewed in plan view of the base portion from the front-rear direction, the head is positioned to partially overlap with the first guide member. In the second engaging position, when the base portion is viewed in a planar manner from the front-rear direction, the shaft portion is positioned in a position that does not coincide with the first guide member.

3. The power conversion device according to claim 1 or 2, The locking component is a bolt component, which has the head and the shaft portion having external threads. An internal thread portion capable of engaging with the external thread portion is formed on the inner surface of the hole. The bolt component is configured such that the height of the head in the vertical direction can be changed by altering the engagement position of the external thread portion and the internal thread portion.

4. The power conversion device according to claim 1 or 2, A plurality of capacitors are mounted on the mounting surface in an arrangement along the front-to-back direction. Each of the capacitors has a cylindrical portion and a terminal disposed at the upper end of the cylindrical portion. The capacitor unit also includes wiring components connected to the terminals of each capacitor.

5. The power conversion device according to claim 1 or 2, It also has multiple component units, The capacitor unit and the plurality of component units are arranged at intervals along the vertical direction inside the housing.

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